source3/smbd/process.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    process incoming packets - main loop
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Volker Lendecke 2005-2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "../lib/tsocket/tsocket.h"
  23 #include "system/filesys.h"
  24 #include "smbd/smbd.h"
  25 #include "smbd/globals.h"
  26 #include "librpc/gen_ndr/netlogon.h"
  27 #include "../lib/async_req/async_sock.h"
  28 #include "ctdbd_conn.h"
  29 #include "../lib/util/select.h"
  30 #include "printing/queue_process.h"
  31 #include "system/select.h"
  32 #include "passdb.h"
  33 #include "auth.h"
  34 #include "messages.h"
  35 #include "smbprofile.h"
  36 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  37 #include "libsmb/libsmb.h"
  38 #include "../lib/util/tevent_ntstatus.h"
  39
  40 extern bool global_machine_password_needs_changing;
  41
  42 static void construct_reply_common(struct smb_request *req, const char *inbuf,
  43                                    char *outbuf);
  44 static struct pending_message_list *get_deferred_open_message_smb(
  45         struct smbd_server_connection *sconn, uint64_t mid);
  46
  47 static bool smbd_lock_socket_internal(struct smbd_server_connection *sconn)
  48 {
  49         bool ok;
  50
  51         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  52                 return true;
  53         }
  54
  55         sconn->smb1.echo_handler.ref_count++;
  56
  57         if (sconn->smb1.echo_handler.ref_count > 1) {
  58                 return true;
  59         }
  60
  61         DEBUG(10,("pid[%d] wait for socket lock\n", (int)sys_getpid()));
  62
  63         do {
  64                 ok = fcntl_lock(
  65                         sconn->smb1.echo_handler.socket_lock_fd,
  66                         SMB_F_SETLKW, 0, 0, F_WRLCK);
  67         } while (!ok && (errno == EINTR));
  68
  69         if (!ok) {
  70                 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
  71                 return false;
  72         }
  73
  74         DEBUG(10,("pid[%d] got for socket lock\n", (int)sys_getpid()));
  75
  76         return true;
  77 }
  78
  79 void smbd_lock_socket(struct smbd_server_connection *sconn)
  80 {
  81         if (!smbd_lock_socket_internal(sconn)) {
  82                 exit_server_cleanly("failed to lock socket");
  83         }
  84 }
  85
  86 static bool smbd_unlock_socket_internal(struct smbd_server_connection *sconn)
  87 {
  88         bool ok;
  89
  90         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
  91                 return true;
  92         }
  93
  94         sconn->smb1.echo_handler.ref_count--;
  95
  96         if (sconn->smb1.echo_handler.ref_count > 0) {
  97                 return true;
  98         }
  99
 100         do {
 101                 ok = fcntl_lock(
 102                         sconn->smb1.echo_handler.socket_lock_fd,
 103                         SMB_F_SETLKW, 0, 0, F_UNLCK);
 104         } while (!ok && (errno == EINTR));
 105
 106         if (!ok) {
 107                 DEBUG(1, ("fcntl_lock failed: %s\n", strerror(errno)));
 108                 return false;
 109         }
 110
 111         DEBUG(10,("pid[%d] unlocked socket\n", (int)sys_getpid()));
 112
 113         return true;
 114 }
 115
 116 void smbd_unlock_socket(struct smbd_server_connection *sconn)
 117 {
 118         if (!smbd_unlock_socket_internal(sconn)) {
 119                 exit_server_cleanly("failed to unlock socket");
 120         }
 121 }
 122
 123 /* Accessor function for smb_read_error for smbd functions. */
 124
 125 /****************************************************************************
 126  Send an smb to a fd.
 127 ****************************************************************************/
 128
 129 bool srv_send_smb(struct smbd_server_connection *sconn, char *buffer,
 130                   bool do_signing, uint32_t seqnum,
 131                   bool do_encrypt,
 132                   struct smb_perfcount_data *pcd)
 133 {
 134         size_t len = 0;
 135         size_t nwritten=0;
 136         ssize_t ret;
 137         char *buf_out = buffer;
 138
 139         smbd_lock_socket(sconn);
 140
 141         if (do_signing) {
 142                 /* Sign the outgoing packet if required. */
 143                 srv_calculate_sign_mac(sconn, buf_out, seqnum);
 144         }
 145
 146         if (do_encrypt) {
 147                 NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
 148                 if (!NT_STATUS_IS_OK(status)) {
 149                         DEBUG(0, ("send_smb: SMB encryption failed "
 150                                 "on outgoing packet! Error %s\n",
 151                                 nt_errstr(status) ));
 152                         goto out;
 153                 }
 154         }
 155
 156         len = smb_len(buf_out) + 4;
 157
 158         ret = write_data(sconn->sock, buf_out+nwritten, len - nwritten);
 159         if (ret <= 0) {
 160
 161                 char addr[INET6_ADDRSTRLEN];
 162                 /*
 163                  * Try and give an error message saying what
 164                  * client failed.
 165                  */
 166                 DEBUG(1,("pid[%d] Error writing %d bytes to client %s. %d. (%s)\n",
 167                          (int)sys_getpid(), (int)len,
 168                          get_peer_addr(sconn->sock, addr, sizeof(addr)),
 169                          (int)ret, strerror(errno) ));
 170
 171                 srv_free_enc_buffer(buf_out);
 172                 goto out;
 173         }
 174
 175         SMB_PERFCOUNT_SET_MSGLEN_OUT(pcd, len);
 176         srv_free_enc_buffer(buf_out);
 177 out:
 178         SMB_PERFCOUNT_END(pcd);
 179
 180         smbd_unlock_socket(sconn);
 181         return true;
 182 }
 183
 184 /*******************************************************************
 185  Setup the word count and byte count for a smb message.
 186 ********************************************************************/
 187
 188 int srv_set_message(char *buf,
 189                         int num_words,
 190                         int num_bytes,
 191                         bool zero)
 192 {
 193         if (zero && (num_words || num_bytes)) {
 194                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
 195         }
 196         SCVAL(buf,smb_wct,num_words);
 197         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
 198         smb_setlen(buf,(smb_size + num_words*2 + num_bytes - 4));
 199         return (smb_size + num_words*2 + num_bytes);
 200 }
 201
 202 static bool valid_smb_header(const uint8_t *inbuf)
 203 {
 204         if (is_encrypted_packet(inbuf)) {
 205                 return true;
 206         }
 207         /*
 208          * This used to be (strncmp(smb_base(inbuf),"\377SMB",4) == 0)
 209          * but it just looks weird to call strncmp for this one.
 210          */
 211         return (IVAL(smb_base(inbuf), 0) == 0x424D53FF);
 212 }
 213
 214 /* Socket functions for smbd packet processing. */
 215
 216 static bool valid_packet_size(size_t len)
 217 {
 218         /*
 219          * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
 220          * of header. Don't print the error if this fits.... JRA.
 221          */
 222
 223         if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
 224                 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
 225                                         (unsigned long)len));
 226                 return false;
 227         }
 228         return true;
 229 }
 230
 231 static NTSTATUS read_packet_remainder(int fd, char *buffer,
 232                                       unsigned int timeout, ssize_t len)
 233 {
 234         NTSTATUS status;
 235
 236         if (len <= 0) {
 237                 return NT_STATUS_OK;
 238         }
 239
 240         status = read_fd_with_timeout(fd, buffer, len, len, timeout, NULL);
 241         if (!NT_STATUS_IS_OK(status)) {
 242                 char addr[INET6_ADDRSTRLEN];
 243                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 244                           "error = %s.\n",
 245                           get_peer_addr(fd, addr, sizeof(addr)),
 246                           nt_errstr(status)));
 247         }
 248         return status;
 249 }
 250
 251 /****************************************************************************
 252  Attempt a zerocopy writeX read. We know here that len > smb_size-4
 253 ****************************************************************************/
 254
 255 /*
 256  * Unfortunately, earlier versions of smbclient/libsmbclient
 257  * don't send this "standard" writeX header. I've fixed this
 258  * for 3.2 but we'll use the old method with earlier versions.
 259  * Windows and CIFSFS at least use this standard size. Not
 260  * sure about MacOSX.
 261  */
 262
 263 #define STANDARD_WRITE_AND_X_HEADER_SIZE (smb_size - 4 + /* basic header */ \
 264                                 (2*14) + /* word count (including bcc) */ \
 265                                 1 /* pad byte */)
 266
 267 static NTSTATUS receive_smb_raw_talloc_partial_read(TALLOC_CTX *mem_ctx,
 268                                                     const char lenbuf[4],
 269                                                     struct smbd_server_connection *sconn,
 270                                                     int sock,
 271                                                     char **buffer,
 272                                                     unsigned int timeout,
 273                                                     size_t *p_unread,
 274                                                     size_t *len_ret)
 275 {
 276         /* Size of a WRITEX call (+4 byte len). */
 277         char writeX_header[4 + STANDARD_WRITE_AND_X_HEADER_SIZE];
 278         ssize_t len = smb_len_large(lenbuf); /* Could be a UNIX large writeX. */
 279         ssize_t toread;
 280         NTSTATUS status;
 281
 282         memcpy(writeX_header, lenbuf, 4);
 283
 284         status = read_fd_with_timeout(
 285                 sock, writeX_header + 4,
 286                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 287                 STANDARD_WRITE_AND_X_HEADER_SIZE,
 288                 timeout, NULL);
 289
 290         if (!NT_STATUS_IS_OK(status)) {
 291                 DEBUG(0, ("read_fd_with_timeout failed for client %s read "
 292                           "error = %s.\n",
 293                           tsocket_address_string(sconn->remote_address,
 294                                                  talloc_tos()),
 295                           nt_errstr(status)));
 296                 return status;
 297         }
 298
 299         /*
 300          * Ok - now try and see if this is a possible
 301          * valid writeX call.
 302          */
 303
 304         if (is_valid_writeX_buffer(sconn, (uint8_t *)writeX_header)) {
 305                 /*
 306                  * If the data offset is beyond what
 307                  * we've read, drain the extra bytes.
 308                  */
 309                 uint16_t doff = SVAL(writeX_header,smb_vwv11);
 310                 ssize_t newlen;
 311
 312                 if (doff > STANDARD_WRITE_AND_X_HEADER_SIZE) {
 313                         size_t drain = doff - STANDARD_WRITE_AND_X_HEADER_SIZE;
 314                         if (drain_socket(sock, drain) != drain) {
 315                                 smb_panic("receive_smb_raw_talloc_partial_read:"
 316                                         " failed to drain pending bytes");
 317                         }
 318                 } else {
 319                         doff = STANDARD_WRITE_AND_X_HEADER_SIZE;
 320                 }
 321
 322                 /* Spoof down the length and null out the bcc. */
 323                 set_message_bcc(writeX_header, 0);
 324                 newlen = smb_len(writeX_header);
 325
 326                 /* Copy the header we've written. */
 327
 328                 *buffer = (char *)talloc_memdup(mem_ctx,
 329                                 writeX_header,
 330                                 sizeof(writeX_header));
 331
 332                 if (*buffer == NULL) {
 333                         DEBUG(0, ("Could not allocate inbuf of length %d\n",
 334                                   (int)sizeof(writeX_header)));
 335                         return NT_STATUS_NO_MEMORY;
 336                 }
 337
 338                 /* Work out the remaining bytes. */
 339                 *p_unread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 340                 *len_ret = newlen + 4;
 341                 return NT_STATUS_OK;
 342         }
 343
 344         if (!valid_packet_size(len)) {
 345                 return NT_STATUS_INVALID_PARAMETER;
 346         }
 347
 348         /*
 349          * Not a valid writeX call. Just do the standard
 350          * talloc and return.
 351          */
 352
 353         *buffer = talloc_array(mem_ctx, char, len+4);
 354
 355         if (*buffer == NULL) {
 356                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 357                           (int)len+4));
 358                 return NT_STATUS_NO_MEMORY;
 359         }
 360
 361         /* Copy in what we already read. */
 362         memcpy(*buffer,
 363                 writeX_header,
 364                 4 + STANDARD_WRITE_AND_X_HEADER_SIZE);
 365         toread = len - STANDARD_WRITE_AND_X_HEADER_SIZE;
 366
 367         if(toread > 0) {
 368                 status = read_packet_remainder(
 369                         sock,
 370                         (*buffer) + 4 + STANDARD_WRITE_AND_X_HEADER_SIZE,
 371                         timeout, toread);
 372
 373                 if (!NT_STATUS_IS_OK(status)) {
 374                         DEBUG(10, ("receive_smb_raw_talloc_partial_read: %s\n",
 375                                    nt_errstr(status)));
 376                         return status;
 377                 }
 378         }
 379
 380         *len_ret = len + 4;
 381         return NT_STATUS_OK;
 382 }
 383
 384 static NTSTATUS receive_smb_raw_talloc(TALLOC_CTX *mem_ctx,
 385                                        struct smbd_server_connection *sconn,
 386                                        int sock,
 387                                        char **buffer, unsigned int timeout,
 388                                        size_t *p_unread, size_t *plen)
 389 {
 390         char lenbuf[4];
 391         size_t len;
 392         int min_recv_size = lp_min_receive_file_size();
 393         NTSTATUS status;
 394
 395         *p_unread = 0;
 396
 397         status = read_smb_length_return_keepalive(sock, lenbuf, timeout,
 398                                                   &len);
 399         if (!NT_STATUS_IS_OK(status)) {
 400                 return status;
 401         }
 402
 403         if (CVAL(lenbuf,0) == 0 && min_recv_size &&
 404             (smb_len_large(lenbuf) > /* Could be a UNIX large writeX. */
 405                 (min_recv_size + STANDARD_WRITE_AND_X_HEADER_SIZE)) &&
 406             !srv_is_signing_active(sconn) &&
 407             sconn->smb1.echo_handler.trusted_fde == NULL) {
 408
 409                 return receive_smb_raw_talloc_partial_read(
 410                         mem_ctx, lenbuf, sconn, sock, buffer, timeout,
 411                         p_unread, plen);
 412         }
 413
 414         if (!valid_packet_size(len)) {
 415                 return NT_STATUS_INVALID_PARAMETER;
 416         }
 417
 418         /*
 419          * The +4 here can't wrap, we've checked the length above already.
 420          */
 421
 422         *buffer = talloc_array(mem_ctx, char, len+4);
 423
 424         if (*buffer == NULL) {
 425                 DEBUG(0, ("Could not allocate inbuf of length %d\n",
 426                           (int)len+4));
 427                 return NT_STATUS_NO_MEMORY;
 428         }
 429
 430         memcpy(*buffer, lenbuf, sizeof(lenbuf));
 431
 432         status = read_packet_remainder(sock, (*buffer)+4, timeout, len);
 433         if (!NT_STATUS_IS_OK(status)) {
 434                 return status;
 435         }
 436
 437         *plen = len + 4;
 438         return NT_STATUS_OK;
 439 }
 440
 441 static NTSTATUS receive_smb_talloc(TALLOC_CTX *mem_ctx,
 442                                    struct smbd_server_connection *sconn,
 443                                    int sock,
 444                                    char **buffer, unsigned int timeout,
 445                                    size_t *p_unread, bool *p_encrypted,
 446                                    size_t *p_len,
 447                                    uint32_t *seqnum,
 448                                    bool trusted_channel)
 449 {
 450         size_t len = 0;
 451         NTSTATUS status;
 452
 453         *p_encrypted = false;
 454
 455         status = receive_smb_raw_talloc(mem_ctx, sconn, sock, buffer, timeout,
 456                                         p_unread, &len);
 457         if (!NT_STATUS_IS_OK(status)) {
 458                 DEBUG(1, ("read_smb_length_return_keepalive failed for "
 459                           "client %s read error = %s.\n",
 460                           tsocket_address_string(sconn->remote_address,
 461                                                  talloc_tos()),
 462                           nt_errstr(status)));
 463                 return status;
 464         }
 465
 466         if (is_encrypted_packet((uint8_t *)*buffer)) {
 467                 status = srv_decrypt_buffer(*buffer);
 468                 if (!NT_STATUS_IS_OK(status)) {
 469                         DEBUG(0, ("receive_smb_talloc: SMB decryption failed on "
 470                                 "incoming packet! Error %s\n",
 471                                 nt_errstr(status) ));
 472                         return status;
 473                 }
 474                 *p_encrypted = true;
 475         }
 476
 477         /* Check the incoming SMB signature. */
 478         if (!srv_check_sign_mac(sconn, *buffer, seqnum, trusted_channel)) {
 479                 DEBUG(0, ("receive_smb: SMB Signature verification failed on "
 480                           "incoming packet!\n"));
 481                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 482         }
 483
 484         *p_len = len;
 485         return NT_STATUS_OK;
 486 }
 487
 488 /*
 489  * Initialize a struct smb_request from an inbuf
 490  */
 491
 492 static bool init_smb_request(struct smb_request *req,
 493                              struct smbd_server_connection *sconn,
 494                              const uint8 *inbuf,
 495                              size_t unread_bytes, bool encrypted,
 496                              uint32_t seqnum)
 497 {
 498         size_t req_size = smb_len(inbuf) + 4;
 499         /* Ensure we have at least smb_size bytes. */
 500         if (req_size < smb_size) {
 501                 DEBUG(0,("init_smb_request: invalid request size %u\n",
 502                         (unsigned int)req_size ));
 503                 return false;
 504         }
 505         req->cmd    = CVAL(inbuf, smb_com);
 506         req->flags2 = SVAL(inbuf, smb_flg2);
 507         req->smbpid = SVAL(inbuf, smb_pid);
 508         req->mid    = (uint64_t)SVAL(inbuf, smb_mid);
 509         req->seqnum = seqnum;
 510         req->vuid   = SVAL(inbuf, smb_uid);
 511         req->tid    = SVAL(inbuf, smb_tid);
 512         req->wct    = CVAL(inbuf, smb_wct);
 513         req->vwv    = discard_const_p(uint16_t, (inbuf+smb_vwv));
 514         req->buflen = smb_buflen(inbuf);
 515         req->buf    = (const uint8_t *)smb_buf_const(inbuf);
 516         req->unread_bytes = unread_bytes;
 517         req->encrypted = encrypted;
 518         req->sconn = sconn;
 519         req->conn = conn_find(sconn,req->tid);
 520         req->chain_fsp = NULL;
 521         req->chain_outbuf = NULL;
 522         req->done = false;
 523         req->smb2req = NULL;
 524         smb_init_perfcount_data(&req->pcd);
 525
 526         /* Ensure we have at least wct words and 2 bytes of bcc. */
 527         if (smb_size + req->wct*2 > req_size) {
 528                 DEBUG(0,("init_smb_request: invalid wct number %u (size %u)\n",
 529                         (unsigned int)req->wct,
 530                         (unsigned int)req_size));
 531                 return false;
 532         }
 533         /* Ensure bcc is correct. */
 534         if (((const uint8_t *)smb_buf_const(inbuf)) + req->buflen > inbuf + req_size) {
 535                 DEBUG(0,("init_smb_request: invalid bcc number %u "
 536                         "(wct = %u, size %u)\n",
 537                         (unsigned int)req->buflen,
 538                         (unsigned int)req->wct,
 539                         (unsigned int)req_size));
 540                 return false;
 541         }
 542
 543         req->outbuf = NULL;
 544         return true;
 545 }
 546
 547 static void process_smb(struct smbd_server_connection *conn,
 548                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
 549                         uint32_t seqnum, bool encrypted,
 550                         struct smb_perfcount_data *deferred_pcd);
 551
 552 static void smbd_deferred_open_timer(struct event_context *ev,
 553                                      struct timed_event *te,
 554                                      struct timeval _tval,
 555                                      void *private_data)
 556 {
 557         struct pending_message_list *msg = talloc_get_type(private_data,
 558                                            struct pending_message_list);
 559         TALLOC_CTX *mem_ctx = talloc_tos();
 560         uint64_t mid = (uint64_t)SVAL(msg->buf.data,smb_mid);
 561         uint8_t *inbuf;
 562
 563         inbuf = (uint8_t *)talloc_memdup(mem_ctx, msg->buf.data,
 564                                          msg->buf.length);
 565         if (inbuf == NULL) {
 566                 exit_server("smbd_deferred_open_timer: talloc failed\n");
 567                 return;
 568         }
 569
 570         /* We leave this message on the queue so the open code can
 571            know this is a retry. */
 572         DEBUG(5,("smbd_deferred_open_timer: trigger mid %llu.\n",
 573                 (unsigned long long)mid ));
 574
 575         /* Mark the message as processed so this is not
 576          * re-processed in error. */
 577         msg->processed = true;
 578
 579         process_smb(smbd_server_conn, inbuf,
 580                     msg->buf.length, 0,
 581                     msg->seqnum, msg->encrypted, &msg->pcd);
 582
 583         /* If it's still there and was processed, remove it. */
 584         msg = get_deferred_open_message_smb(smbd_server_conn, mid);
 585         if (msg && msg->processed) {
 586                 remove_deferred_open_message_smb(smbd_server_conn, mid);
 587         }
 588 }
 589
 590 /****************************************************************************
 591  Function to push a message onto the tail of a linked list of smb messages ready
 592  for processing.
 593 ****************************************************************************/
 594
 595 static bool push_queued_message(struct smb_request *req,
 596                                 struct timeval request_time,
 597                                 struct timeval end_time,
 598                                 char *private_data, size_t private_len)
 599 {
 600         int msg_len = smb_len(req->inbuf) + 4;
 601         struct pending_message_list *msg;
 602
 603         msg = talloc_zero(NULL, struct pending_message_list);
 604
 605         if(msg == NULL) {
 606                 DEBUG(0,("push_message: malloc fail (1)\n"));
 607                 return False;
 608         }
 609
 610         msg->buf = data_blob_talloc(msg, req->inbuf, msg_len);
 611         if(msg->buf.data == NULL) {
 612                 DEBUG(0,("push_message: malloc fail (2)\n"));
 613                 TALLOC_FREE(msg);
 614                 return False;
 615         }
 616
 617         msg->request_time = request_time;
 618         msg->seqnum = req->seqnum;
 619         msg->encrypted = req->encrypted;
 620         msg->processed = false;
 621         SMB_PERFCOUNT_DEFER_OP(&req->pcd, &msg->pcd);
 622
 623         if (private_data) {
 624                 msg->private_data = data_blob_talloc(msg, private_data,
 625                                                      private_len);
 626                 if (msg->private_data.data == NULL) {
 627                         DEBUG(0,("push_message: malloc fail (3)\n"));
 628                         TALLOC_FREE(msg);
 629                         return False;
 630                 }
 631         }
 632
 633         msg->te = event_add_timed(server_event_context(),
 634                                   msg,
 635                                   end_time,
 636                                   smbd_deferred_open_timer,
 637                                   msg);
 638         if (!msg->te) {
 639                 DEBUG(0,("push_message: event_add_timed failed\n"));
 640                 TALLOC_FREE(msg);
 641                 return false;
 642         }
 643
 644         DLIST_ADD_END(req->sconn->deferred_open_queue, msg,
 645                       struct pending_message_list *);
 646
 647         DEBUG(10,("push_message: pushed message length %u on "
 648                   "deferred_open_queue\n", (unsigned int)msg_len));
 649
 650         return True;
 651 }
 652
 653 /****************************************************************************
 654  Function to delete a sharing violation open message by mid.
 655 ****************************************************************************/
 656
 657 void remove_deferred_open_message_smb(struct smbd_server_connection *sconn,
 658                                       uint64_t mid)
 659 {
 660         struct pending_message_list *pml;
 661
 662         if (sconn->using_smb2) {
 663                 remove_deferred_open_message_smb2(sconn, mid);
 664                 return;
 665         }
 666
 667         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 668                 if (mid == (uint64_t)SVAL(pml->buf.data,smb_mid)) {
 669                         DEBUG(10,("remove_deferred_open_message_smb: "
 670                                   "deleting mid %llu len %u\n",
 671                                   (unsigned long long)mid,
 672                                   (unsigned int)pml->buf.length ));
 673                         DLIST_REMOVE(sconn->deferred_open_queue, pml);
 674                         TALLOC_FREE(pml);
 675                         return;
 676                 }
 677         }
 678 }
 679
 680 /****************************************************************************
 681  Move a sharing violation open retry message to the front of the list and
 682  schedule it for immediate processing.
 683 ****************************************************************************/
 684
 685 void schedule_deferred_open_message_smb(struct smbd_server_connection *sconn,
 686                                         uint64_t mid)
 687 {
 688         struct pending_message_list *pml;
 689         int i = 0;
 690
 691         if (sconn->using_smb2) {
 692                 schedule_deferred_open_message_smb2(sconn, mid);
 693                 return;
 694         }
 695
 696         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 697                 uint64_t msg_mid = (uint64_t)SVAL(pml->buf.data,smb_mid);
 698
 699                 DEBUG(10,("schedule_deferred_open_message_smb: [%d] "
 700                         "msg_mid = %llu\n",
 701                         i++,
 702                         (unsigned long long)msg_mid ));
 703
 704                 if (mid == msg_mid) {
 705                         struct timed_event *te;
 706
 707                         if (pml->processed) {
 708                                 /* A processed message should not be
 709                                  * rescheduled. */
 710                                 DEBUG(0,("schedule_deferred_open_message_smb: LOGIC ERROR "
 711                                         "message mid %llu was already processed\n",
 712                                         (unsigned long long)msg_mid ));
 713                                 continue;
 714                         }
 715
 716                         DEBUG(10,("schedule_deferred_open_message_smb: "
 717                                 "scheduling mid %llu\n",
 718                                 (unsigned long long)mid ));
 719
 720                         te = event_add_timed(server_event_context(),
 721                                              pml,
 722                                              timeval_zero(),
 723                                              smbd_deferred_open_timer,
 724                                              pml);
 725                         if (!te) {
 726                                 DEBUG(10,("schedule_deferred_open_message_smb: "
 727                                         "event_add_timed() failed, "
 728                                         "skipping mid %llu\n",
 729                                         (unsigned long long)msg_mid ));
 730                         }
 731
 732                         TALLOC_FREE(pml->te);
 733                         pml->te = te;
 734                         DLIST_PROMOTE(sconn->deferred_open_queue, pml);
 735                         return;
 736                 }
 737         }
 738
 739         DEBUG(10,("schedule_deferred_open_message_smb: failed to "
 740                 "find message mid %llu\n",
 741                 (unsigned long long)mid ));
 742 }
 743
 744 /****************************************************************************
 745  Return true if this mid is on the deferred queue and was not yet processed.
 746 ****************************************************************************/
 747
 748 bool open_was_deferred(struct smbd_server_connection *sconn, uint64_t mid)
 749 {
 750         struct pending_message_list *pml;
 751
 752         if (sconn->using_smb2) {
 753                 return open_was_deferred_smb2(sconn, mid);
 754         }
 755
 756         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 757                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid && !pml->processed) {
 758                         return True;
 759                 }
 760         }
 761         return False;
 762 }
 763
 764 /****************************************************************************
 765  Return the message queued by this mid.
 766 ****************************************************************************/
 767
 768 static struct pending_message_list *get_deferred_open_message_smb(
 769         struct smbd_server_connection *sconn, uint64_t mid)
 770 {
 771         struct pending_message_list *pml;
 772
 773         for (pml = sconn->deferred_open_queue; pml; pml = pml->next) {
 774                 if (((uint64_t)SVAL(pml->buf.data,smb_mid)) == mid) {
 775                         return pml;
 776                 }
 777         }
 778         return NULL;
 779 }
 780
 781 /****************************************************************************
 782  Get the state data queued by this mid.
 783 ****************************************************************************/
 784
 785 bool get_deferred_open_message_state(struct smb_request *smbreq,
 786                                 struct timeval *p_request_time,
 787                                 void **pp_state)
 788 {
 789         struct pending_message_list *pml;
 790
 791         if (smbd_server_conn->using_smb2) {
 792                 return get_deferred_open_message_state_smb2(smbreq->smb2req,
 793                                         p_request_time,
 794                                         pp_state);
 795         }
 796
 797         pml = get_deferred_open_message_smb(smbreq->sconn, smbreq->mid);
 798         if (!pml) {
 799                 return false;
 800         }
 801         if (p_request_time) {
 802                 *p_request_time = pml->request_time;
 803         }
 804         if (pp_state) {
 805                 *pp_state = (void *)pml->private_data.data;
 806         }
 807         return true;
 808 }
 809
 810 /****************************************************************************
 811  Function to push a deferred open smb message onto a linked list of local smb
 812  messages ready for processing.
 813 ****************************************************************************/
 814
 815 bool push_deferred_open_message_smb(struct smb_request *req,
 816                                struct timeval request_time,
 817                                struct timeval timeout,
 818                                struct file_id id,
 819                                char *private_data, size_t priv_len)
 820 {
 821         struct timeval end_time;
 822
 823         if (req->smb2req) {
 824                 return push_deferred_open_message_smb2(req->smb2req,
 825                                                 request_time,
 826                                                 timeout,
 827                                                 id,
 828                                                 private_data,
 829                                                 priv_len);
 830         }
 831
 832         if (req->unread_bytes) {
 833                 DEBUG(0,("push_deferred_open_message_smb: logic error ! "
 834                         "unread_bytes = %u\n",
 835                         (unsigned int)req->unread_bytes ));
 836                 smb_panic("push_deferred_open_message_smb: "
 837                         "logic error unread_bytes != 0" );
 838         }
 839
 840         end_time = timeval_sum(&request_time, &timeout);
 841
 842         DEBUG(10,("push_deferred_open_message_smb: pushing message "
 843                 "len %u mid %llu timeout time [%u.%06u]\n",
 844                 (unsigned int) smb_len(req->inbuf)+4,
 845                 (unsigned long long)req->mid,
 846                 (unsigned int)end_time.tv_sec,
 847                 (unsigned int)end_time.tv_usec));
 848
 849         return push_queued_message(req, request_time, end_time,
 850                                    private_data, priv_len);
 851 }
 852
 853 static void smbd_sig_term_handler(struct tevent_context *ev,
 854                                   struct tevent_signal *se,
 855                                   int signum,
 856                                   int count,
 857                                   void *siginfo,
 858                                   void *private_data)
 859 {
 860         exit_server_cleanly("termination signal");
 861 }
 862
 863 void smbd_setup_sig_term_handler(void)
 864 {
 865         struct tevent_signal *se;
 866
 867         se = tevent_add_signal(server_event_context(),
 868                                server_event_context(),
 869                                SIGTERM, 0,
 870                                smbd_sig_term_handler,
 871                                NULL);
 872         if (!se) {
 873                 exit_server("failed to setup SIGTERM handler");
 874         }
 875 }
 876
 877 static void smbd_sig_hup_handler(struct tevent_context *ev,
 878                                   struct tevent_signal *se,
 879                                   int signum,
 880                                   int count,
 881                                   void *siginfo,
 882                                   void *private_data)
 883 {
 884         struct messaging_context *msg_ctx = talloc_get_type_abort(
 885                 private_data, struct messaging_context);
 886         change_to_root_user();
 887         DEBUG(1,("Reloading services after SIGHUP\n"));
 888         reload_services(msg_ctx, smbd_server_conn->sock, False);
 889         if (am_parent) {
 890                 printing_subsystem_update(ev, msg_ctx, true);
 891         }
 892 }
 893
 894 void smbd_setup_sig_hup_handler(struct tevent_context *ev,
 895                                 struct messaging_context *msg_ctx)
 896 {
 897         struct tevent_signal *se;
 898
 899         se = tevent_add_signal(ev, ev, SIGHUP, 0, smbd_sig_hup_handler,
 900                                msg_ctx);
 901         if (!se) {
 902                 exit_server("failed to setup SIGHUP handler");
 903         }
 904 }
 905
 906 static NTSTATUS smbd_server_connection_loop_once(struct tevent_context *ev_ctx,
 907                                                  struct smbd_server_connection *conn)
 908 {
 909         int timeout;
 910         int num_pfds = 0;
 911         int ret;
 912         bool retry;
 913
 914         timeout = SMBD_SELECT_TIMEOUT * 1000;
 915
 916         /*
 917          * Are there any timed events waiting ? If so, ensure we don't
 918          * select for longer than it would take to wait for them.
 919          */
 920
 921         event_add_to_poll_args(ev_ctx, conn, &conn->pfds, &num_pfds, &timeout);
 922
 923         /* Process a signal and timed events now... */
 924         if (run_events_poll(ev_ctx, 0, NULL, 0)) {
 925                 return NT_STATUS_RETRY;
 926         }
 927
 928         {
 929                 int sav;
 930                 START_PROFILE(smbd_idle);
 931
 932                 ret = sys_poll(conn->pfds, num_pfds, timeout);
 933                 sav = errno;
 934
 935                 END_PROFILE(smbd_idle);
 936                 errno = sav;
 937         }
 938
 939         if (ret == -1) {
 940                 if (errno == EINTR) {
 941                         return NT_STATUS_RETRY;
 942                 }
 943                 return map_nt_error_from_unix(errno);
 944         }
 945
 946         retry = run_events_poll(ev_ctx, ret, conn->pfds, num_pfds);
 947         if (retry) {
 948                 return NT_STATUS_RETRY;
 949         }
 950
 951         /* Did we timeout ? */
 952         if (ret == 0) {
 953                 return NT_STATUS_RETRY;
 954         }
 955
 956         /* should not be reached */
 957         return NT_STATUS_INTERNAL_ERROR;
 958 }
 959
 960 /*
 961  * Only allow 5 outstanding trans requests. We're allocating memory, so
 962  * prevent a DoS.
 963  */
 964
 965 NTSTATUS allow_new_trans(struct trans_state *list, uint64_t mid)
 966 {
 967         int count = 0;
 968         for (; list != NULL; list = list->next) {
 969
 970                 if (list->mid == mid) {
 971                         return NT_STATUS_INVALID_PARAMETER;
 972                 }
 973
 974                 count += 1;
 975         }
 976         if (count > 5) {
 977                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 978         }
 979
 980         return NT_STATUS_OK;
 981 }
 982
 983 /*
 984 These flags determine some of the permissions required to do an operation
 985
 986 Note that I don't set NEED_WRITE on some write operations because they
 987 are used by some brain-dead clients when printing, and I don't want to
 988 force write permissions on print services.
 989 */
 990 #define AS_USER (1<<0)
 991 #define NEED_WRITE (1<<1) /* Must be paired with AS_USER */
 992 #define TIME_INIT (1<<2)
 993 #define CAN_IPC (1<<3) /* Must be paired with AS_USER */
 994 #define AS_GUEST (1<<5) /* Must *NOT* be paired with AS_USER */
 995 #define DO_CHDIR (1<<6)
 996
 997 /*
 998    define a list of possible SMB messages and their corresponding
 999    functions. Any message that has a NULL function is unimplemented -
1000    please feel free to contribute implementations!
1001 */
1002 static const struct smb_message_struct {
1003         const char *name;
1004         void (*fn)(struct smb_request *req);
1005         int flags;
1006 } smb_messages[256] = {
1007
1008 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
1009 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
1010 /* 0x02 */ { "SMBopen",reply_open,AS_USER },
1011 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
1012 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
1013 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
1014 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE },
1015 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE },
1016 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
1017 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
1018 /* 0x0a */ { "SMBread",reply_read,AS_USER},
1019 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
1020 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
1021 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
1022 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
1023 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
1024 /* 0x10 */ { "SMBcheckpath",reply_checkpath,AS_USER},
1025 /* 0x11 */ { "SMBexit",reply_exit,DO_CHDIR},
1026 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
1027 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
1028 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
1029 /* 0x15 */ { NULL, NULL, 0 },
1030 /* 0x16 */ { NULL, NULL, 0 },
1031 /* 0x17 */ { NULL, NULL, 0 },
1032 /* 0x18 */ { NULL, NULL, 0 },
1033 /* 0x19 */ { NULL, NULL, 0 },
1034 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
1035 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
1036 /* 0x1c */ { "SMBreadBs",reply_readbs,AS_USER },
1037 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
1038 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
1039 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
1040 /* 0x20 */ { "SMBwritec", NULL,0},
1041 /* 0x21 */ { NULL, NULL, 0 },
1042 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
1043 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
1044 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
1045 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
1046 /* 0x26 */ { "SMBtranss",reply_transs,AS_USER | CAN_IPC},
1047 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
1048 /* 0x28 */ { "SMBioctls", NULL,AS_USER},
1049 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE },
1050 /* 0x2a */ { "SMBmove", NULL,AS_USER | NEED_WRITE },
1051 /* 0x2b */ { "SMBecho",reply_echo,0},
1052 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
1053 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC },
1054 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
1055 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
1056 /* 0x30 */ { NULL, NULL, 0 },
1057 /* 0x31 */ { NULL, NULL, 0 },
1058 /* 0x32 */ { "SMBtrans2",reply_trans2, AS_USER | CAN_IPC },
1059 /* 0x33 */ { "SMBtranss2",reply_transs2, AS_USER | CAN_IPC },
1060 /* 0x34 */ { "SMBfindclose",reply_findclose,AS_USER},
1061 /* 0x35 */ { "SMBfindnclose",reply_findnclose,AS_USER},
1062 /* 0x36 */ { NULL, NULL, 0 },
1063 /* 0x37 */ { NULL, NULL, 0 },
1064 /* 0x38 */ { NULL, NULL, 0 },
1065 /* 0x39 */ { NULL, NULL, 0 },
1066 /* 0x3a */ { NULL, NULL, 0 },
1067 /* 0x3b */ { NULL, NULL, 0 },
1068 /* 0x3c */ { NULL, NULL, 0 },
1069 /* 0x3d */ { NULL, NULL, 0 },
1070 /* 0x3e */ { NULL, NULL, 0 },
1071 /* 0x3f */ { NULL, NULL, 0 },
1072 /* 0x40 */ { NULL, NULL, 0 },
1073 /* 0x41 */ { NULL, NULL, 0 },
1074 /* 0x42 */ { NULL, NULL, 0 },
1075 /* 0x43 */ { NULL, NULL, 0 },
1076 /* 0x44 */ { NULL, NULL, 0 },
1077 /* 0x45 */ { NULL, NULL, 0 },
1078 /* 0x46 */ { NULL, NULL, 0 },
1079 /* 0x47 */ { NULL, NULL, 0 },
1080 /* 0x48 */ { NULL, NULL, 0 },
1081 /* 0x49 */ { NULL, NULL, 0 },
1082 /* 0x4a */ { NULL, NULL, 0 },
1083 /* 0x4b */ { NULL, NULL, 0 },
1084 /* 0x4c */ { NULL, NULL, 0 },
1085 /* 0x4d */ { NULL, NULL, 0 },
1086 /* 0x4e */ { NULL, NULL, 0 },
1087 /* 0x4f */ { NULL, NULL, 0 },
1088 /* 0x50 */ { NULL, NULL, 0 },
1089 /* 0x51 */ { NULL, NULL, 0 },
1090 /* 0x52 */ { NULL, NULL, 0 },
1091 /* 0x53 */ { NULL, NULL, 0 },
1092 /* 0x54 */ { NULL, NULL, 0 },
1093 /* 0x55 */ { NULL, NULL, 0 },
1094 /* 0x56 */ { NULL, NULL, 0 },
1095 /* 0x57 */ { NULL, NULL, 0 },
1096 /* 0x58 */ { NULL, NULL, 0 },
1097 /* 0x59 */ { NULL, NULL, 0 },
1098 /* 0x5a */ { NULL, NULL, 0 },
1099 /* 0x5b */ { NULL, NULL, 0 },
1100 /* 0x5c */ { NULL, NULL, 0 },
1101 /* 0x5d */ { NULL, NULL, 0 },
1102 /* 0x5e */ { NULL, NULL, 0 },
1103 /* 0x5f */ { NULL, NULL, 0 },
1104 /* 0x60 */ { NULL, NULL, 0 },
1105 /* 0x61 */ { NULL, NULL, 0 },
1106 /* 0x62 */ { NULL, NULL, 0 },
1107 /* 0x63 */ { NULL, NULL, 0 },
1108 /* 0x64 */ { NULL, NULL, 0 },
1109 /* 0x65 */ { NULL, NULL, 0 },
1110 /* 0x66 */ { NULL, NULL, 0 },
1111 /* 0x67 */ { NULL, NULL, 0 },
1112 /* 0x68 */ { NULL, NULL, 0 },
1113 /* 0x69 */ { NULL, NULL, 0 },
1114 /* 0x6a */ { NULL, NULL, 0 },
1115 /* 0x6b */ { NULL, NULL, 0 },
1116 /* 0x6c */ { NULL, NULL, 0 },
1117 /* 0x6d */ { NULL, NULL, 0 },
1118 /* 0x6e */ { NULL, NULL, 0 },
1119 /* 0x6f */ { NULL, NULL, 0 },
1120 /* 0x70 */ { "SMBtcon",reply_tcon,0},
1121 /* 0x71 */ { "SMBtdis",reply_tdis,DO_CHDIR},
1122 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
1123 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
1124 /* 0x74 */ { "SMBulogoffX",reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
1125 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
1126 /* 0x76 */ { NULL, NULL, 0 },
1127 /* 0x77 */ { NULL, NULL, 0 },
1128 /* 0x78 */ { NULL, NULL, 0 },
1129 /* 0x79 */ { NULL, NULL, 0 },
1130 /* 0x7a */ { NULL, NULL, 0 },
1131 /* 0x7b */ { NULL, NULL, 0 },
1132 /* 0x7c */ { NULL, NULL, 0 },
1133 /* 0x7d */ { NULL, NULL, 0 },
1134 /* 0x7e */ { NULL, NULL, 0 },
1135 /* 0x7f */ { NULL, NULL, 0 },
1136 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
1137 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
1138 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
1139 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
1140 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
1141 /* 0x85 */ { NULL, NULL, 0 },
1142 /* 0x86 */ { NULL, NULL, 0 },
1143 /* 0x87 */ { NULL, NULL, 0 },
1144 /* 0x88 */ { NULL, NULL, 0 },
1145 /* 0x89 */ { NULL, NULL, 0 },
1146 /* 0x8a */ { NULL, NULL, 0 },
1147 /* 0x8b */ { NULL, NULL, 0 },
1148 /* 0x8c */ { NULL, NULL, 0 },
1149 /* 0x8d */ { NULL, NULL, 0 },
1150 /* 0x8e */ { NULL, NULL, 0 },
1151 /* 0x8f */ { NULL, NULL, 0 },
1152 /* 0x90 */ { NULL, NULL, 0 },
1153 /* 0x91 */ { NULL, NULL, 0 },
1154 /* 0x92 */ { NULL, NULL, 0 },
1155 /* 0x93 */ { NULL, NULL, 0 },
1156 /* 0x94 */ { NULL, NULL, 0 },
1157 /* 0x95 */ { NULL, NULL, 0 },
1158 /* 0x96 */ { NULL, NULL, 0 },
1159 /* 0x97 */ { NULL, NULL, 0 },
1160 /* 0x98 */ { NULL, NULL, 0 },
1161 /* 0x99 */ { NULL, NULL, 0 },
1162 /* 0x9a */ { NULL, NULL, 0 },
1163 /* 0x9b */ { NULL, NULL, 0 },
1164 /* 0x9c */ { NULL, NULL, 0 },
1165 /* 0x9d */ { NULL, NULL, 0 },
1166 /* 0x9e */ { NULL, NULL, 0 },
1167 /* 0x9f */ { NULL, NULL, 0 },
1168 /* 0xa0 */ { "SMBnttrans",reply_nttrans, AS_USER | CAN_IPC },
1169 /* 0xa1 */ { "SMBnttranss",reply_nttranss, AS_USER | CAN_IPC },
1170 /* 0xa2 */ { "SMBntcreateX",reply_ntcreate_and_X, AS_USER | CAN_IPC },
1171 /* 0xa3 */ { NULL, NULL, 0 },
1172 /* 0xa4 */ { "SMBntcancel",reply_ntcancel, 0 },
1173 /* 0xa5 */ { "SMBntrename",reply_ntrename, AS_USER | NEED_WRITE },
1174 /* 0xa6 */ { NULL, NULL, 0 },
1175 /* 0xa7 */ { NULL, NULL, 0 },
1176 /* 0xa8 */ { NULL, NULL, 0 },
1177 /* 0xa9 */ { NULL, NULL, 0 },
1178 /* 0xaa */ { NULL, NULL, 0 },
1179 /* 0xab */ { NULL, NULL, 0 },
1180 /* 0xac */ { NULL, NULL, 0 },
1181 /* 0xad */ { NULL, NULL, 0 },
1182 /* 0xae */ { NULL, NULL, 0 },
1183 /* 0xaf */ { NULL, NULL, 0 },
1184 /* 0xb0 */ { NULL, NULL, 0 },
1185 /* 0xb1 */ { NULL, NULL, 0 },
1186 /* 0xb2 */ { NULL, NULL, 0 },
1187 /* 0xb3 */ { NULL, NULL, 0 },
1188 /* 0xb4 */ { NULL, NULL, 0 },
1189 /* 0xb5 */ { NULL, NULL, 0 },
1190 /* 0xb6 */ { NULL, NULL, 0 },
1191 /* 0xb7 */ { NULL, NULL, 0 },
1192 /* 0xb8 */ { NULL, NULL, 0 },
1193 /* 0xb9 */ { NULL, NULL, 0 },
1194 /* 0xba */ { NULL, NULL, 0 },
1195 /* 0xbb */ { NULL, NULL, 0 },
1196 /* 0xbc */ { NULL, NULL, 0 },
1197 /* 0xbd */ { NULL, NULL, 0 },
1198 /* 0xbe */ { NULL, NULL, 0 },
1199 /* 0xbf */ { NULL, NULL, 0 },
1200 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER},
1201 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
1202 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
1203 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
1204 /* 0xc4 */ { NULL, NULL, 0 },
1205 /* 0xc5 */ { NULL, NULL, 0 },
1206 /* 0xc6 */ { NULL, NULL, 0 },
1207 /* 0xc7 */ { NULL, NULL, 0 },
1208 /* 0xc8 */ { NULL, NULL, 0 },
1209 /* 0xc9 */ { NULL, NULL, 0 },
1210 /* 0xca */ { NULL, NULL, 0 },
1211 /* 0xcb */ { NULL, NULL, 0 },
1212 /* 0xcc */ { NULL, NULL, 0 },
1213 /* 0xcd */ { NULL, NULL, 0 },
1214 /* 0xce */ { NULL, NULL, 0 },
1215 /* 0xcf */ { NULL, NULL, 0 },
1216 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
1217 /* 0xd1 */ { "SMBsendb", NULL,AS_GUEST},
1218 /* 0xd2 */ { "SMBfwdname", NULL,AS_GUEST},
1219 /* 0xd3 */ { "SMBcancelf", NULL,AS_GUEST},
1220 /* 0xd4 */ { "SMBgetmac", NULL,AS_GUEST},
1221 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
1222 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
1223 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
1224 /* 0xd8 */ { NULL, NULL, 0 },
1225 /* 0xd9 */ { NULL, NULL, 0 },
1226 /* 0xda */ { NULL, NULL, 0 },
1227 /* 0xdb */ { NULL, NULL, 0 },
1228 /* 0xdc */ { NULL, NULL, 0 },
1229 /* 0xdd */ { NULL, NULL, 0 },
1230 /* 0xde */ { NULL, NULL, 0 },
1231 /* 0xdf */ { NULL, NULL, 0 },
1232 /* 0xe0 */ { NULL, NULL, 0 },
1233 /* 0xe1 */ { NULL, NULL, 0 },
1234 /* 0xe2 */ { NULL, NULL, 0 },
1235 /* 0xe3 */ { NULL, NULL, 0 },
1236 /* 0xe4 */ { NULL, NULL, 0 },
1237 /* 0xe5 */ { NULL, NULL, 0 },
1238 /* 0xe6 */ { NULL, NULL, 0 },
1239 /* 0xe7 */ { NULL, NULL, 0 },
1240 /* 0xe8 */ { NULL, NULL, 0 },
1241 /* 0xe9 */ { NULL, NULL, 0 },
1242 /* 0xea */ { NULL, NULL, 0 },
1243 /* 0xeb */ { NULL, NULL, 0 },
1244 /* 0xec */ { NULL, NULL, 0 },
1245 /* 0xed */ { NULL, NULL, 0 },
1246 /* 0xee */ { NULL, NULL, 0 },
1247 /* 0xef */ { NULL, NULL, 0 },
1248 /* 0xf0 */ { NULL, NULL, 0 },
1249 /* 0xf1 */ { NULL, NULL, 0 },
1250 /* 0xf2 */ { NULL, NULL, 0 },
1251 /* 0xf3 */ { NULL, NULL, 0 },
1252 /* 0xf4 */ { NULL, NULL, 0 },
1253 /* 0xf5 */ { NULL, NULL, 0 },
1254 /* 0xf6 */ { NULL, NULL, 0 },
1255 /* 0xf7 */ { NULL, NULL, 0 },
1256 /* 0xf8 */ { NULL, NULL, 0 },
1257 /* 0xf9 */ { NULL, NULL, 0 },
1258 /* 0xfa */ { NULL, NULL, 0 },
1259 /* 0xfb */ { NULL, NULL, 0 },
1260 /* 0xfc */ { NULL, NULL, 0 },
1261 /* 0xfd */ { NULL, NULL, 0 },
1262 /* 0xfe */ { NULL, NULL, 0 },
1263 /* 0xff */ { NULL, NULL, 0 }
1264
1265 };
1266
1267 /*******************************************************************
1268  allocate and initialize a reply packet
1269 ********************************************************************/
1270
1271 static bool create_outbuf(TALLOC_CTX *mem_ctx, struct smb_request *req,
1272                           const char *inbuf, char **outbuf, uint8_t num_words,
1273                           uint32_t num_bytes)
1274 {
1275         /*
1276          * Protect against integer wrap
1277          */
1278         if ((num_bytes > 0xffffff)
1279             || ((num_bytes + smb_size + num_words*2) > 0xffffff)) {
1280                 char *msg;
1281                 if (asprintf(&msg, "num_bytes too large: %u",
1282                              (unsigned)num_bytes) == -1) {
1283                         msg = discard_const_p(char, "num_bytes too large");
1284                 }
1285                 smb_panic(msg);
1286         }
1287
1288         *outbuf = talloc_array(mem_ctx, char,
1289                                smb_size + num_words*2 + num_bytes);
1290         if (*outbuf == NULL) {
1291                 return false;
1292         }
1293
1294         construct_reply_common(req, inbuf, *outbuf);
1295         srv_set_message(*outbuf, num_words, num_bytes, false);
1296         /*
1297          * Zero out the word area, the caller has to take care of the bcc area
1298          * himself
1299          */
1300         if (num_words != 0) {
1301                 memset(*outbuf + smb_vwv0, 0, num_words*2);
1302         }
1303
1304         return true;
1305 }
1306
1307 void reply_outbuf(struct smb_request *req, uint8 num_words, uint32 num_bytes)
1308 {
1309         char *outbuf;
1310         if (!create_outbuf(req, req, (const char *)req->inbuf, &outbuf, num_words,
1311                            num_bytes)) {
1312                 smb_panic("could not allocate output buffer\n");
1313         }
1314         req->outbuf = (uint8_t *)outbuf;
1315 }
1316
1317
1318 /*******************************************************************
1319  Dump a packet to a file.
1320 ********************************************************************/
1321
1322 static void smb_dump(const char *name, int type, const char *data, ssize_t len)
1323 {
1324         int fd, i;
1325         char *fname = NULL;
1326         if (DEBUGLEVEL < 50) {
1327                 return;
1328         }
1329
1330         if (len < 4) len = smb_len(data)+4;
1331         for (i=1;i<100;i++) {
1332                 if (asprintf(&fname, "/tmp/%s.%d.%s", name, i,
1333                              type ? "req" : "resp") == -1) {
1334                         return;
1335                 }
1336                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
1337                 if (fd != -1 || errno != EEXIST) break;
1338         }
1339         if (fd != -1) {
1340                 ssize_t ret = write(fd, data, len);
1341                 if (ret != len)
1342                         DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
1343                 close(fd);
1344                 DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
1345         }
1346         SAFE_FREE(fname);
1347 }
1348
1349 /****************************************************************************
1350  Prepare everything for calling the actual request function, and potentially
1351  call the request function via the "new" interface.
1352
1353  Return False if the "legacy" function needs to be called, everything is
1354  prepared.
1355
1356  Return True if we're done.
1357
1358  I know this API sucks, but it is the one with the least code change I could
1359  find.
1360 ****************************************************************************/
1361
1362 static connection_struct *switch_message(uint8 type, struct smb_request *req, int size)
1363 {
1364         int flags;
1365         uint16 session_tag;
1366         connection_struct *conn = NULL;
1367         struct smbd_server_connection *sconn = req->sconn;
1368         char *raddr;
1369
1370         errno = 0;
1371
1372         /* Make sure this is an SMB packet. smb_size contains NetBIOS header
1373          * so subtract 4 from it. */
1374         if (!valid_smb_header(req->inbuf)
1375             || (size < (smb_size - 4))) {
1376                 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",
1377                          smb_len(req->inbuf)));
1378                 exit_server_cleanly("Non-SMB packet");
1379         }
1380
1381         if (smb_messages[type].fn == NULL) {
1382                 DEBUG(0,("Unknown message type %d!\n",type));
1383                 smb_dump("Unknown", 1, (const char *)req->inbuf, size);
1384                 reply_unknown_new(req, type);
1385                 return NULL;
1386         }
1387
1388         flags = smb_messages[type].flags;
1389
1390         /* In share mode security we must ignore the vuid. */
1391         session_tag = (lp_security() == SEC_SHARE)
1392                 ? UID_FIELD_INVALID : req->vuid;
1393         conn = req->conn;
1394
1395         DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n", smb_fn_name(type),
1396                  (int)sys_getpid(), (unsigned long)conn));
1397
1398         smb_dump(smb_fn_name(type), 1, (const char *)req->inbuf, size);
1399
1400         /* Ensure this value is replaced in the incoming packet. */
1401         SSVAL(discard_const_p(uint8_t, req->inbuf),smb_uid,session_tag);
1402
1403         /*
1404          * Ensure the correct username is in current_user_info.  This is a
1405          * really ugly bugfix for problems with multiple session_setup_and_X's
1406          * being done and allowing %U and %G substitutions to work correctly.
1407          * There is a reason this code is done here, don't move it unless you
1408          * know what you're doing... :-).
1409          * JRA.
1410          */
1411
1412         if (session_tag != sconn->smb1.sessions.last_session_tag) {
1413                 user_struct *vuser = NULL;
1414
1415                 sconn->smb1.sessions.last_session_tag = session_tag;
1416                 if(session_tag != UID_FIELD_INVALID) {
1417                         vuser = get_valid_user_struct(sconn, session_tag);
1418                         if (vuser) {
1419                                 set_current_user_info(
1420                                         vuser->session_info->unix_info->sanitized_username,
1421                                         vuser->session_info->unix_info->unix_name,
1422                                         vuser->session_info->info->domain_name);
1423                         }
1424                 }
1425         }
1426
1427         /* Does this call need to be run as the connected user? */
1428         if (flags & AS_USER) {
1429
1430                 /* Does this call need a valid tree connection? */
1431                 if (!conn) {
1432                         /*
1433                          * Amazingly, the error code depends on the command
1434                          * (from Samba4).
1435                          */
1436                         if (type == SMBntcreateX) {
1437                                 reply_nterror(req, NT_STATUS_INVALID_HANDLE);
1438                         } else {
1439                                 reply_nterror(req, NT_STATUS_NETWORK_NAME_DELETED);
1440                         }
1441                         return NULL;
1442                 }
1443
1444                 if (!change_to_user(conn,session_tag)) {
1445                         DEBUG(0, ("Error: Could not change to user. Removing "
1446                                 "deferred open, mid=%llu.\n",
1447                                 (unsigned long long)req->mid));
1448                         reply_force_doserror(req, ERRSRV, ERRbaduid);
1449                         return conn;
1450                 }
1451
1452                 /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
1453
1454                 /* Does it need write permission? */
1455                 if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
1456                         reply_nterror(req, NT_STATUS_MEDIA_WRITE_PROTECTED);
1457                         return conn;
1458                 }
1459
1460                 /* IPC services are limited */
1461                 if (IS_IPC(conn) && !(flags & CAN_IPC)) {
1462                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1463                         return conn;
1464                 }
1465         } else {
1466                 /* This call needs to be run as root */
1467                 change_to_root_user();
1468         }
1469
1470         /* load service specific parameters */
1471         if (conn) {
1472                 if (req->encrypted) {
1473                         conn->encrypted_tid = true;
1474                         /* encrypted required from now on. */
1475                         conn->encrypt_level = Required;
1476                 } else if (ENCRYPTION_REQUIRED(conn)) {
1477                         if (req->cmd != SMBtrans2 && req->cmd != SMBtranss2) {
1478                                 exit_server_cleanly("encryption required "
1479                                         "on connection");
1480                                 return conn;
1481                         }
1482                 }
1483
1484                 if (!set_current_service(conn,SVAL(req->inbuf,smb_flg),
1485                                          (flags & (AS_USER|DO_CHDIR)
1486                                           ?True:False))) {
1487                         reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1488                         return conn;
1489                 }
1490                 conn->num_smb_operations++;
1491         }
1492
1493         raddr = tsocket_address_inet_addr_string(sconn->remote_address,
1494                                                  talloc_tos());
1495         if (raddr == NULL) {
1496                 reply_nterror(req, NT_STATUS_NO_MEMORY);
1497                 return conn;
1498         }
1499
1500         /* does this protocol need to be run as guest? */
1501         if ((flags & AS_GUEST)
1502             && (!change_to_guest() ||
1503                 !allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
1504                               sconn->remote_hostname,
1505                               raddr))) {
1506                 reply_nterror(req, NT_STATUS_ACCESS_DENIED);
1507                 return conn;
1508         }
1509
1510         smb_messages[type].fn(req);
1511         return req->conn;
1512 }
1513
1514 /****************************************************************************
1515  Construct a reply to the incoming packet.
1516 ****************************************************************************/
1517
1518 static void construct_reply(struct smbd_server_connection *sconn,
1519                             char *inbuf, int size, size_t unread_bytes,
1520                             uint32_t seqnum, bool encrypted,
1521                             struct smb_perfcount_data *deferred_pcd)
1522 {
1523         connection_struct *conn;
1524         struct smb_request *req;
1525
1526         if (!(req = talloc(talloc_tos(), struct smb_request))) {
1527                 smb_panic("could not allocate smb_request");
1528         }
1529
1530         if (!init_smb_request(req, sconn, (uint8 *)inbuf, unread_bytes,
1531                               encrypted, seqnum)) {
1532                 exit_server_cleanly("Invalid SMB request");
1533         }
1534
1535         req->inbuf  = (uint8_t *)talloc_move(req, &inbuf);
1536
1537         /* we popped this message off the queue - keep original perf data */
1538         if (deferred_pcd)
1539                 req->pcd = *deferred_pcd;
1540         else {
1541                 SMB_PERFCOUNT_START(&req->pcd);
1542                 SMB_PERFCOUNT_SET_OP(&req->pcd, req->cmd);
1543                 SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, size);
1544         }
1545
1546         conn = switch_message(req->cmd, req, size);
1547
1548         if (req->unread_bytes) {
1549                 /* writeX failed. drain socket. */
1550                 if (drain_socket(req->sconn->sock, req->unread_bytes) !=
1551                                 req->unread_bytes) {
1552                         smb_panic("failed to drain pending bytes");
1553                 }
1554                 req->unread_bytes = 0;
1555         }
1556
1557         if (req->done) {
1558                 TALLOC_FREE(req);
1559                 return;
1560         }
1561
1562         if (req->outbuf == NULL) {
1563                 return;
1564         }
1565
1566         if (CVAL(req->outbuf,0) == 0) {
1567                 show_msg((char *)req->outbuf);
1568         }
1569
1570         if (!srv_send_smb(req->sconn,
1571                         (char *)req->outbuf,
1572                         true, req->seqnum+1,
1573                         IS_CONN_ENCRYPTED(conn)||req->encrypted,
1574                         &req->pcd)) {
1575                 exit_server_cleanly("construct_reply: srv_send_smb failed.");
1576         }
1577
1578         TALLOC_FREE(req);
1579
1580         return;
1581 }
1582
1583 /****************************************************************************
1584  Process an smb from the client
1585 ****************************************************************************/
1586 static void process_smb(struct smbd_server_connection *sconn,
1587                         uint8_t *inbuf, size_t nread, size_t unread_bytes,
1588                         uint32_t seqnum, bool encrypted,
1589                         struct smb_perfcount_data *deferred_pcd)
1590 {
1591         int msg_type = CVAL(inbuf,0);
1592
1593         DO_PROFILE_INC(smb_count);
1594
1595         DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type,
1596                     smb_len(inbuf) ) );
1597         DEBUG(3, ("Transaction %d of length %d (%u toread)\n",
1598                   sconn->trans_num, (int)nread, (unsigned int)unread_bytes));
1599
1600         if (msg_type != NBSSmessage) {
1601                 /*
1602                  * NetBIOS session request, keepalive, etc.
1603                  */
1604                 reply_special(sconn, (char *)inbuf, nread);
1605                 goto done;
1606         }
1607
1608         if (sconn->using_smb2) {
1609                 /* At this point we're not really using smb2,
1610                  * we make the decision here.. */
1611                 if (smbd_is_smb2_header(inbuf, nread)) {
1612                         smbd_smb2_first_negprot(sconn, inbuf, nread);
1613                         return;
1614                 } else if (nread >= smb_size && valid_smb_header(inbuf)
1615                                 && CVAL(inbuf, smb_com) != 0x72) {
1616                         /* This is a non-negprot SMB1 packet.
1617                            Disable SMB2 from now on. */
1618                         sconn->using_smb2 = false;
1619                 }
1620         }
1621
1622         show_msg((char *)inbuf);
1623
1624         construct_reply(sconn, (char *)inbuf, nread, unread_bytes, seqnum,
1625                         encrypted, deferred_pcd);
1626         sconn->trans_num++;
1627
1628 done:
1629         sconn->num_requests++;
1630
1631         /* The timeout_processing function isn't run nearly
1632            often enough to implement 'max log size' without
1633            overrunning the size of the file by many megabytes.
1634            This is especially true if we are running at debug
1635            level 10.  Checking every 50 SMBs is a nice
1636            tradeoff of performance vs log file size overrun. */
1637
1638         if ((sconn->num_requests % 50) == 0 &&
1639             need_to_check_log_size()) {
1640                 change_to_root_user();
1641                 check_log_size();
1642         }
1643 }
1644
1645 /****************************************************************************
1646  Return a string containing the function name of a SMB command.
1647 ****************************************************************************/
1648
1649 const char *smb_fn_name(int type)
1650 {
1651         const char *unknown_name = "SMBunknown";
1652
1653         if (smb_messages[type].name == NULL)
1654                 return(unknown_name);
1655
1656         return(smb_messages[type].name);
1657 }
1658
1659 /****************************************************************************
1660  Helper functions for contruct_reply.
1661 ****************************************************************************/
1662
1663 void add_to_common_flags2(uint32 v)
1664 {
1665         common_flags2 |= v;
1666 }
1667
1668 void remove_from_common_flags2(uint32 v)
1669 {
1670         common_flags2 &= ~v;
1671 }
1672
1673 static void construct_reply_common(struct smb_request *req, const char *inbuf,
1674                                    char *outbuf)
1675 {
1676         srv_set_message(outbuf,0,0,false);
1677
1678         SCVAL(outbuf, smb_com, req->cmd);
1679         SIVAL(outbuf,smb_rcls,0);
1680         SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
1681         SSVAL(outbuf,smb_flg2,
1682                 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
1683                 common_flags2);
1684         memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));
1685
1686         SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
1687         SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
1688         SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
1689         SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
1690 }
1691
1692 void construct_reply_common_req(struct smb_request *req, char *outbuf)
1693 {
1694         construct_reply_common(req, (const char *)req->inbuf, outbuf);
1695 }
1696
1697 /*
1698  * How many bytes have we already accumulated up to the current wct field
1699  * offset?
1700  */
1701
1702 size_t req_wct_ofs(struct smb_request *req)
1703 {
1704         size_t buf_size;
1705
1706         if (req->chain_outbuf == NULL) {
1707                 return smb_wct - 4;
1708         }
1709         buf_size = talloc_get_size(req->chain_outbuf);
1710         if ((buf_size % 4) != 0) {
1711                 buf_size += (4 - (buf_size % 4));
1712         }
1713         return buf_size - 4;
1714 }
1715
1716 /*
1717  * Hack around reply_nterror & friends not being aware of chained requests,
1718  * generating illegal (i.e. wct==0) chain replies.
1719  */
1720
1721 static void fixup_chain_error_packet(struct smb_request *req)
1722 {
1723         uint8_t *outbuf = req->outbuf;
1724         req->outbuf = NULL;
1725         reply_outbuf(req, 2, 0);
1726         memcpy(req->outbuf, outbuf, smb_wct);
1727         TALLOC_FREE(outbuf);
1728         SCVAL(req->outbuf, smb_vwv0, 0xff);
1729 }
1730
1731 /**
1732  * @brief Find the smb_cmd offset of the last command pushed
1733  * @param[in] buf       The buffer we're building up
1734  * @retval              Where can we put our next andx cmd?
1735  *
1736  * While chaining requests, the "next" request we're looking at needs to put
1737  * its SMB_Command before the data the previous request already built up added
1738  * to the chain. Find the offset to the place where we have to put our cmd.
1739  */
1740
1741 static bool find_andx_cmd_ofs(uint8_t *buf, size_t *pofs)
1742 {
1743         uint8_t cmd;
1744         size_t ofs;
1745
1746         cmd = CVAL(buf, smb_com);
1747
1748         SMB_ASSERT(is_andx_req(cmd));
1749
1750         ofs = smb_vwv0;
1751
1752         while (CVAL(buf, ofs) != 0xff) {
1753
1754                 if (!is_andx_req(CVAL(buf, ofs))) {
1755                         return false;
1756                 }
1757
1758                 /*
1759                  * ofs is from start of smb header, so add the 4 length
1760                  * bytes. The next cmd is right after the wct field.
1761                  */
1762                 ofs = SVAL(buf, ofs+2) + 4 + 1;
1763
1764                 SMB_ASSERT(ofs+4 < talloc_get_size(buf));
1765         }
1766
1767         *pofs = ofs;
1768         return true;
1769 }
1770
1771 /**
1772  * @brief Do the smb chaining at a buffer level
1773  * @param[in] poutbuf           Pointer to the talloc'ed buffer to be modified
1774  * @param[in] smb_command       The command that we want to issue
1775  * @param[in] wct               How many words?
1776  * @param[in] vwv               The words, already in network order
1777  * @param[in] bytes_alignment   How shall we align "bytes"?
1778  * @param[in] num_bytes         How many bytes?
1779  * @param[in] bytes             The data the request ships
1780  *
1781  * smb_splice_chain() adds the vwv and bytes to the request already present in
1782  * *poutbuf.
1783  */
1784
1785 static bool smb_splice_chain(uint8_t **poutbuf, uint8_t smb_command,
1786                              uint8_t wct, const uint16_t *vwv,
1787                              size_t bytes_alignment,
1788                              uint32_t num_bytes, const uint8_t *bytes)
1789 {
1790         uint8_t *outbuf;
1791         size_t old_size, new_size;
1792         size_t ofs;
1793         size_t chain_padding = 0;
1794         size_t bytes_padding = 0;
1795         bool first_request;
1796
1797         old_size = talloc_get_size(*poutbuf);
1798
1799         /*
1800          * old_size == smb_wct means we're pushing the first request in for
1801          * libsmb/
1802          */
1803
1804         first_request = (old_size == smb_wct);
1805
1806         if (!first_request && ((old_size % 4) != 0)) {
1807                 /*
1808                  * Align the wct field of subsequent requests to a 4-byte
1809                  * boundary
1810                  */
1811                 chain_padding = 4 - (old_size % 4);
1812         }
1813
1814         /*
1815          * After the old request comes the new wct field (1 byte), the vwv's
1816          * and the num_bytes field. After at we might need to align the bytes
1817          * given to us to "bytes_alignment", increasing the num_bytes value.
1818          */
1819
1820         new_size = old_size + chain_padding + 1 + wct * sizeof(uint16_t) + 2;
1821
1822         if ((bytes_alignment != 0) && ((new_size % bytes_alignment) != 0)) {
1823                 bytes_padding = bytes_alignment - (new_size % bytes_alignment);
1824         }
1825
1826         new_size += bytes_padding + num_bytes;
1827
1828         if ((smb_command != SMBwriteX) && (new_size > 0xffff)) {
1829                 DEBUG(1, ("splice_chain: %u bytes won't fit\n",
1830                           (unsigned)new_size));
1831                 return false;
1832         }
1833
1834         outbuf = talloc_realloc(NULL, *poutbuf, uint8_t, new_size);
1835         if (outbuf == NULL) {
1836                 DEBUG(0, ("talloc failed\n"));
1837                 return false;
1838         }
1839         *poutbuf = outbuf;
1840
1841         if (first_request) {
1842                 SCVAL(outbuf, smb_com, smb_command);
1843         } else {
1844                 size_t andx_cmd_ofs;
1845
1846                 if (!find_andx_cmd_ofs(outbuf, &andx_cmd_ofs)) {
1847                         DEBUG(1, ("invalid command chain\n"));
1848                         *poutbuf = talloc_realloc(
1849                                 NULL, *poutbuf, uint8_t, old_size);
1850                         return false;
1851                 }
1852
1853                 if (chain_padding != 0) {
1854                         memset(outbuf + old_size, 0, chain_padding);
1855                         old_size += chain_padding;
1856                 }
1857
1858                 SCVAL(outbuf, andx_cmd_ofs, smb_command);
1859                 SSVAL(outbuf, andx_cmd_ofs + 2, old_size - 4);
1860         }
1861
1862         ofs = old_size;
1863
1864         /*
1865          * Push the chained request:
1866          *
1867          * wct field
1868          */
1869
1870         SCVAL(outbuf, ofs, wct);
1871         ofs += 1;
1872
1873         /*
1874          * vwv array
1875          */
1876
1877         memcpy(outbuf + ofs, vwv, sizeof(uint16_t) * wct);
1878         ofs += sizeof(uint16_t) * wct;
1879
1880         /*
1881          * bcc (byte count)
1882          */
1883
1884         SSVAL(outbuf, ofs, num_bytes + bytes_padding);
1885         ofs += sizeof(uint16_t);
1886
1887         /*
1888          * padding
1889          */
1890
1891         if (bytes_padding != 0) {
1892                 memset(outbuf + ofs, 0, bytes_padding);
1893                 ofs += bytes_padding;
1894         }
1895
1896         /*
1897          * The bytes field
1898          */
1899
1900         memcpy(outbuf + ofs, bytes, num_bytes);
1901
1902         return true;
1903 }
1904
1905 /****************************************************************************
1906  Construct a chained reply and add it to the already made reply
1907 ****************************************************************************/
1908
1909 void chain_reply(struct smb_request *req)
1910 {
1911         size_t smblen = smb_len(req->inbuf);
1912         size_t already_used, length_needed;
1913         uint8_t chain_cmd;
1914         uint32_t chain_offset;  /* uint32_t to avoid overflow */
1915
1916         uint8_t wct;
1917         const uint16_t *vwv;
1918         uint16_t buflen;
1919         const uint8_t *buf;
1920
1921         if (IVAL(req->outbuf, smb_rcls) != 0) {
1922                 fixup_chain_error_packet(req);
1923         }
1924
1925         /*
1926          * Any of the AndX requests and replies have at least a wct of
1927          * 2. vwv[0] is the next command, vwv[1] is the offset from the
1928          * beginning of the SMB header to the next wct field.
1929          *
1930          * None of the AndX requests put anything valuable in vwv[0] and [1],
1931          * so we can overwrite it here to form the chain.
1932          */
1933
1934         if ((req->wct < 2) || (CVAL(req->outbuf, smb_wct) < 2)) {
1935                 if (req->chain_outbuf == NULL) {
1936                         req->chain_outbuf = talloc_realloc(
1937                                 req, req->outbuf, uint8_t,
1938                                 smb_len(req->outbuf) + 4);
1939                         if (req->chain_outbuf == NULL) {
1940                                 smb_panic("talloc failed");
1941                         }
1942                 }
1943                 req->outbuf = NULL;
1944                 goto error;
1945         }
1946
1947         /*
1948          * Here we assume that this is the end of the chain. For that we need
1949          * to set "next command" to 0xff and the offset to 0. If we later find
1950          * more commands in the chain, this will be overwritten again.
1951          */
1952
1953         SCVAL(req->outbuf, smb_vwv0, 0xff);
1954         SCVAL(req->outbuf, smb_vwv0+1, 0);
1955         SSVAL(req->outbuf, smb_vwv1, 0);
1956
1957         if (req->chain_outbuf == NULL) {
1958                 /*
1959                  * In req->chain_outbuf we collect all the replies. Start the
1960                  * chain by copying in the first reply.
1961                  *
1962                  * We do the realloc because later on we depend on
1963                  * talloc_get_size to determine the length of
1964                  * chain_outbuf. The reply_xxx routines might have
1965                  * over-allocated (reply_pipe_read_and_X used to be such an
1966                  * example).
1967                  */
1968                 req->chain_outbuf = talloc_realloc(
1969                         req, req->outbuf, uint8_t, smb_len(req->outbuf) + 4);
1970                 if (req->chain_outbuf == NULL) {
1971                         smb_panic("talloc failed");
1972                 }
1973                 req->outbuf = NULL;
1974         } else {
1975                 /*
1976                  * Update smb headers where subsequent chained commands
1977                  * may have updated them.
1978                  */
1979                 SSVAL(req->chain_outbuf, smb_tid, SVAL(req->outbuf, smb_tid));
1980                 SSVAL(req->chain_outbuf, smb_uid, SVAL(req->outbuf, smb_uid));
1981
1982                 if (!smb_splice_chain(&req->chain_outbuf,
1983                                       CVAL(req->outbuf, smb_com),
1984                                       CVAL(req->outbuf, smb_wct),
1985                                       (uint16_t *)(req->outbuf + smb_vwv),
1986                                       0, smb_buflen(req->outbuf),
1987                                       (uint8_t *)smb_buf(req->outbuf))) {
1988                         goto error;
1989                 }
1990                 TALLOC_FREE(req->outbuf);
1991         }
1992
1993         /*
1994          * We use the old request's vwv field to grab the next chained command
1995          * and offset into the chained fields.
1996          */
1997
1998         chain_cmd = CVAL(req->vwv+0, 0);
1999         chain_offset = SVAL(req->vwv+1, 0);
2000
2001         if (chain_cmd == 0xff) {
2002                 /*
2003                  * End of chain, no more requests from the client. So ship the
2004                  * replies.
2005                  */
2006                 smb_setlen((char *)(req->chain_outbuf),
2007                            talloc_get_size(req->chain_outbuf) - 4);
2008
2009                 if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2010                                   true, req->seqnum+1,
2011                                   IS_CONN_ENCRYPTED(req->conn)
2012                                   ||req->encrypted,
2013                                   &req->pcd)) {
2014                         exit_server_cleanly("chain_reply: srv_send_smb "
2015                                             "failed.");
2016                 }
2017                 TALLOC_FREE(req->chain_outbuf);
2018                 req->done = true;
2019                 return;
2020         }
2021
2022         /* add a new perfcounter for this element of chain */
2023         SMB_PERFCOUNT_ADD(&req->pcd);
2024         SMB_PERFCOUNT_SET_OP(&req->pcd, chain_cmd);
2025         SMB_PERFCOUNT_SET_MSGLEN_IN(&req->pcd, smblen);
2026
2027         /*
2028          * Check if the client tries to fool us. The chain offset
2029          * needs to point beyond the current request in the chain, it
2030          * needs to strictly grow. Otherwise we might be tricked into
2031          * an endless loop always processing the same request over and
2032          * over again. We used to assume that vwv and the byte buffer
2033          * array in a chain are always attached, but OS/2 the
2034          * Write&X/Read&X chain puts the Read&X vwv array right behind
2035          * the Write&X vwv chain. The Write&X bcc array is put behind
2036          * the Read&X vwv array. So now we check whether the chain
2037          * offset points strictly behind the previous vwv
2038          * array. req->buf points right after the vwv array of the
2039          * previous request. See
2040          * https://bugzilla.samba.org/show_bug.cgi?id=8360 for more
2041          * information.
2042          */
2043
2044         already_used = PTR_DIFF(req->buf, smb_base(req->inbuf));
2045         if (chain_offset <= already_used) {
2046                 goto error;
2047         }
2048
2049         /*
2050          * Next check: Make sure the chain offset does not point beyond the
2051          * overall smb request length.
2052          */
2053
2054         length_needed = chain_offset+1; /* wct */
2055         if (length_needed > smblen) {
2056                 goto error;
2057         }
2058
2059         /*
2060          * Now comes the pointer magic. Goal here is to set up req->vwv and
2061          * req->buf correctly again to be able to call the subsequent
2062          * switch_message(). The chain offset (the former vwv[1]) points at
2063          * the new wct field.
2064          */
2065
2066         wct = CVAL(smb_base(req->inbuf), chain_offset);
2067
2068         /*
2069          * Next consistency check: Make the new vwv array fits in the overall
2070          * smb request.
2071          */
2072
2073         length_needed += (wct+1)*sizeof(uint16_t); /* vwv+buflen */
2074         if (length_needed > smblen) {
2075                 goto error;
2076         }
2077         vwv = (const uint16_t *)(smb_base(req->inbuf) + chain_offset + 1);
2078
2079         /*
2080          * Now grab the new byte buffer....
2081          */
2082
2083         buflen = SVAL(vwv+wct, 0);
2084
2085         /*
2086          * .. and check that it fits.
2087          */
2088
2089         length_needed += buflen;
2090         if (length_needed > smblen) {
2091                 goto error;
2092         }
2093         buf = (const uint8_t *)(vwv+wct+1);
2094
2095         req->cmd = chain_cmd;
2096         req->wct = wct;
2097         req->vwv = discard_const_p(uint16_t, vwv);
2098         req->buflen = buflen;
2099         req->buf = buf;
2100
2101         switch_message(chain_cmd, req, smblen);
2102
2103         if (req->outbuf == NULL) {
2104                 /*
2105                  * This happens if the chained command has suspended itself or
2106                  * if it has called srv_send_smb() itself.
2107                  */
2108                 return;
2109         }
2110
2111         /*
2112          * We end up here if the chained command was not itself chained or
2113          * suspended, but for example a close() command. We now need to splice
2114          * the chained commands' outbuf into the already built up chain_outbuf
2115          * and ship the result.
2116          */
2117         goto done;
2118
2119  error:
2120         /*
2121          * We end up here if there's any error in the chain syntax. Report a
2122          * DOS error, just like Windows does.
2123          */
2124         reply_force_doserror(req, ERRSRV, ERRerror);
2125         fixup_chain_error_packet(req);
2126
2127  done:
2128         /*
2129          * This scary statement intends to set the
2130          * FLAGS2_32_BIT_ERROR_CODES flg2 field in req->chain_outbuf
2131          * to the value req->outbuf carries
2132          */
2133         SSVAL(req->chain_outbuf, smb_flg2,
2134               (SVAL(req->chain_outbuf, smb_flg2) & ~FLAGS2_32_BIT_ERROR_CODES)
2135               | (SVAL(req->outbuf, smb_flg2) & FLAGS2_32_BIT_ERROR_CODES));
2136
2137         /*
2138          * Transfer the error codes from the subrequest to the main one
2139          */
2140         SSVAL(req->chain_outbuf, smb_rcls, SVAL(req->outbuf, smb_rcls));
2141         SSVAL(req->chain_outbuf, smb_err, SVAL(req->outbuf, smb_err));
2142
2143         if (!smb_splice_chain(&req->chain_outbuf,
2144                               CVAL(req->outbuf, smb_com),
2145                               CVAL(req->outbuf, smb_wct),
2146                               (uint16_t *)(req->outbuf + smb_vwv),
2147                               0, smb_buflen(req->outbuf),
2148                               (uint8_t *)smb_buf(req->outbuf))) {
2149                 exit_server_cleanly("chain_reply: smb_splice_chain failed\n");
2150         }
2151         TALLOC_FREE(req->outbuf);
2152
2153         smb_setlen((char *)(req->chain_outbuf),
2154                    talloc_get_size(req->chain_outbuf) - 4);
2155
2156         show_msg((char *)(req->chain_outbuf));
2157
2158         if (!srv_send_smb(req->sconn, (char *)req->chain_outbuf,
2159                           true, req->seqnum+1,
2160                           IS_CONN_ENCRYPTED(req->conn)||req->encrypted,
2161                           &req->pcd)) {
2162                 exit_server_cleanly("chain_reply: srv_send_smb failed.");
2163         }
2164         TALLOC_FREE(req->chain_outbuf);
2165         req->done = true;
2166 }
2167
2168 /****************************************************************************
2169  Check if services need reloading.
2170 ****************************************************************************/
2171
2172 static void check_reload(struct smbd_server_connection *sconn, time_t t)
2173 {
2174
2175         if (last_smb_conf_reload_time == 0) {
2176                 last_smb_conf_reload_time = t;
2177         }
2178
2179         if (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK) {
2180                 reload_services(sconn->msg_ctx, sconn->sock, True);
2181                 last_smb_conf_reload_time = t;
2182         }
2183 }
2184
2185 static bool fd_is_readable(int fd)
2186 {
2187         int ret, revents;
2188
2189         ret = poll_one_fd(fd, POLLIN|POLLHUP, 0, &revents);
2190
2191         return ((ret > 0) && ((revents & (POLLIN|POLLHUP|POLLERR)) != 0));
2192
2193 }
2194
2195 static void smbd_server_connection_write_handler(
2196         struct smbd_server_connection *sconn)
2197 {
2198         /* TODO: make write nonblocking */
2199 }
2200
2201 static void smbd_server_connection_read_handler(
2202         struct smbd_server_connection *sconn, int fd)
2203 {
2204         uint8_t *inbuf = NULL;
2205         size_t inbuf_len = 0;
2206         size_t unread_bytes = 0;
2207         bool encrypted = false;
2208         TALLOC_CTX *mem_ctx = talloc_tos();
2209         NTSTATUS status;
2210         uint32_t seqnum;
2211
2212         bool from_client = (sconn->sock == fd);
2213
2214         if (from_client) {
2215                 smbd_lock_socket(sconn);
2216
2217                 if (lp_async_smb_echo_handler()) {
2218
2219                         if (fd_is_readable(sconn->smb1.echo_handler.trusted_fd)) {
2220                                 /*
2221                                  * This is the super-ugly hack to
2222                                  * prefer the packets forwarded by the
2223                                  * echo handler over the ones by the
2224                                  * client directly
2225                                  */
2226                                 fd = sconn->smb1.echo_handler.trusted_fd;
2227                         } else if (!fd_is_readable(fd)) {
2228                                 DEBUG(10,("the echo listener was faster\n"));
2229                                 smbd_unlock_socket(sconn);
2230                                 return;
2231                         }
2232                 }
2233
2234                 /* TODO: make this completely nonblocking */
2235                 status = receive_smb_talloc(mem_ctx, sconn, fd,
2236                                             (char **)(void *)&inbuf,
2237                                             0, /* timeout */
2238                                             &unread_bytes,
2239                                             &encrypted,
2240                                             &inbuf_len, &seqnum,
2241                                             false /* trusted channel */);
2242                 smbd_unlock_socket(sconn);
2243         } else {
2244                 /* TODO: make this completely nonblocking */
2245                 status = receive_smb_talloc(mem_ctx, sconn, fd,
2246                                             (char **)(void *)&inbuf,
2247                                             0, /* timeout */
2248                                             &unread_bytes,
2249                                             &encrypted,
2250                                             &inbuf_len, &seqnum,
2251                                             true /* trusted channel */);
2252         }
2253
2254         if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
2255                 goto process;
2256         }
2257         if (NT_STATUS_IS_ERR(status)) {
2258                 exit_server_cleanly("failed to receive smb request");
2259         }
2260         if (!NT_STATUS_IS_OK(status)) {
2261                 return;
2262         }
2263
2264 process:
2265         process_smb(sconn, inbuf, inbuf_len, unread_bytes,
2266                     seqnum, encrypted, NULL);
2267 }
2268
2269 static void smbd_server_connection_handler(struct event_context *ev,
2270                                            struct fd_event *fde,
2271                                            uint16_t flags,
2272                                            void *private_data)
2273 {
2274         struct smbd_server_connection *conn = talloc_get_type(private_data,
2275                                               struct smbd_server_connection);
2276
2277         if (flags & EVENT_FD_WRITE) {
2278                 smbd_server_connection_write_handler(conn);
2279                 return;
2280         }
2281         if (flags & EVENT_FD_READ) {
2282                 smbd_server_connection_read_handler(conn, conn->sock);
2283                 return;
2284         }
2285 }
2286
2287 static void smbd_server_echo_handler(struct event_context *ev,
2288                                      struct fd_event *fde,
2289                                      uint16_t flags,
2290                                      void *private_data)
2291 {
2292         struct smbd_server_connection *conn = talloc_get_type(private_data,
2293                                               struct smbd_server_connection);
2294
2295         if (flags & EVENT_FD_WRITE) {
2296                 smbd_server_connection_write_handler(conn);
2297                 return;
2298         }
2299         if (flags & EVENT_FD_READ) {
2300                 smbd_server_connection_read_handler(
2301                         conn, conn->smb1.echo_handler.trusted_fd);
2302                 return;
2303         }
2304 }
2305
2306 #ifdef CLUSTER_SUPPORT
2307 /****************************************************************************
2308 received when we should release a specific IP
2309 ****************************************************************************/
2310 static void release_ip(const char *ip, void *priv)
2311 {
2312         const char *addr = (const char *)priv;
2313         const char *p = addr;
2314
2315         if (strncmp("::ffff:", addr, 7) == 0) {
2316                 p = addr + 7;
2317         }
2318
2319         DEBUG(10, ("Got release IP message for %s, "
2320                    "our address is %s\n", ip, p));
2321
2322         if ((strcmp(p, ip) == 0) || ((p != addr) && strcmp(addr, ip) == 0)) {
2323                 /* we can't afford to do a clean exit - that involves
2324                    database writes, which would potentially mean we
2325                    are still running after the failover has finished -
2326                    we have to get rid of this process ID straight
2327                    away */
2328                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
2329                         ip));
2330                 /* note we must exit with non-zero status so the unclean handler gets
2331                    called in the parent, so that the brl database is tickled */
2332                 _exit(1);
2333         }
2334 }
2335
2336 static int client_get_tcp_info(int sock, struct sockaddr_storage *server,
2337                                struct sockaddr_storage *client)
2338 {
2339         socklen_t length;
2340         length = sizeof(*server);
2341         if (getsockname(sock, (struct sockaddr *)server, &length) != 0) {
2342                 return -1;
2343         }
2344         length = sizeof(*client);
2345         if (getpeername(sock, (struct sockaddr *)client, &length) != 0) {
2346                 return -1;
2347         }
2348         return 0;
2349 }
2350 #endif
2351
2352 /*
2353  * Send keepalive packets to our client
2354  */
2355 static bool keepalive_fn(const struct timeval *now, void *private_data)
2356 {
2357         struct smbd_server_connection *sconn = smbd_server_conn;
2358         bool ret;
2359
2360         if (sconn->using_smb2) {
2361                 /* Don't do keepalives on an SMB2 connection. */
2362                 return false;
2363         }
2364
2365         smbd_lock_socket(smbd_server_conn);
2366         ret = send_keepalive(sconn->sock);
2367         smbd_unlock_socket(smbd_server_conn);
2368
2369         if (!ret) {
2370                 char addr[INET6_ADDRSTRLEN];
2371                 /*
2372                  * Try and give an error message saying what
2373                  * client failed.
2374                  */
2375                 DEBUG(0, ("send_keepalive failed for client %s. "
2376                           "Error %s - exiting\n",
2377                           get_peer_addr(sconn->sock, addr, sizeof(addr)),
2378                           strerror(errno)));
2379                 return False;
2380         }
2381         return True;
2382 }
2383
2384 /*
2385  * Do the recurring check if we're idle
2386  */
2387 static bool deadtime_fn(const struct timeval *now, void *private_data)
2388 {
2389         struct smbd_server_connection *sconn =
2390                 (struct smbd_server_connection *)private_data;
2391
2392         if ((conn_num_open(sconn) == 0)
2393             || (conn_idle_all(sconn, now->tv_sec))) {
2394                 DEBUG( 2, ( "Closing idle connection\n" ) );
2395                 messaging_send(sconn->msg_ctx,
2396                                messaging_server_id(sconn->msg_ctx),
2397                                MSG_SHUTDOWN, &data_blob_null);
2398                 return False;
2399         }
2400
2401         return True;
2402 }
2403
2404 /*
2405  * Do the recurring log file and smb.conf reload checks.
2406  */
2407
2408 static bool housekeeping_fn(const struct timeval *now, void *private_data)
2409 {
2410         struct smbd_server_connection *sconn = talloc_get_type_abort(
2411                 private_data, struct smbd_server_connection);
2412
2413         DEBUG(5, ("housekeeping\n"));
2414
2415         change_to_root_user();
2416
2417         /* update printer queue caches if necessary */
2418         update_monitored_printq_cache(sconn->msg_ctx);
2419
2420         /* check if we need to reload services */
2421         check_reload(sconn, time_mono(NULL));
2422
2423         /* Change machine password if neccessary. */
2424         attempt_machine_password_change();
2425
2426         /*
2427          * Force a log file check.
2428          */
2429         force_check_log_size();
2430         check_log_size();
2431         return true;
2432 }
2433
2434 /*
2435  * Read an smb packet in the echo handler child, giving the parent
2436  * smbd one second to react once the socket becomes readable.
2437  */
2438
2439 struct smbd_echo_read_state {
2440         struct tevent_context *ev;
2441         struct smbd_server_connection *sconn;
2442
2443         char *buf;
2444         size_t buflen;
2445         uint32_t seqnum;
2446 };
2447
2448 static void smbd_echo_read_readable(struct tevent_req *subreq);
2449 static void smbd_echo_read_waited(struct tevent_req *subreq);
2450
2451 static struct tevent_req *smbd_echo_read_send(
2452         TALLOC_CTX *mem_ctx, struct tevent_context *ev,
2453         struct smbd_server_connection *sconn)
2454 {
2455         struct tevent_req *req, *subreq;
2456         struct smbd_echo_read_state *state;
2457
2458         req = tevent_req_create(mem_ctx, &state,
2459                                 struct smbd_echo_read_state);
2460         if (req == NULL) {
2461                 return NULL;
2462         }
2463         state->ev = ev;
2464         state->sconn = sconn;
2465
2466         subreq = wait_for_read_send(state, ev, sconn->sock);
2467         if (tevent_req_nomem(subreq, req)) {
2468                 return tevent_req_post(req, ev);
2469         }
2470         tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2471         return req;
2472 }
2473
2474 static void smbd_echo_read_readable(struct tevent_req *subreq)
2475 {
2476         struct tevent_req *req = tevent_req_callback_data(
2477                 subreq, struct tevent_req);
2478         struct smbd_echo_read_state *state = tevent_req_data(
2479                 req, struct smbd_echo_read_state);
2480         bool ok;
2481         int err;
2482
2483         ok = wait_for_read_recv(subreq, &err);
2484         TALLOC_FREE(subreq);
2485         if (!ok) {
2486                 tevent_req_nterror(req, map_nt_error_from_unix(err));
2487                 return;
2488         }
2489
2490         /*
2491          * Give the parent smbd one second to step in
2492          */
2493
2494         subreq = tevent_wakeup_send(
2495                 state, state->ev, timeval_current_ofs(1, 0));
2496         if (tevent_req_nomem(subreq, req)) {
2497                 return;
2498         }
2499         tevent_req_set_callback(subreq, smbd_echo_read_waited, req);
2500 }
2501
2502 static void smbd_echo_read_waited(struct tevent_req *subreq)
2503 {
2504         struct tevent_req *req = tevent_req_callback_data(
2505                 subreq, struct tevent_req);
2506         struct smbd_echo_read_state *state = tevent_req_data(
2507                 req, struct smbd_echo_read_state);
2508         struct smbd_server_connection *sconn = state->sconn;
2509         bool ok;
2510         NTSTATUS status;
2511         size_t unread = 0;
2512         bool encrypted;
2513
2514         ok = tevent_wakeup_recv(subreq);
2515         TALLOC_FREE(subreq);
2516         if (!ok) {
2517                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2518                 return;
2519         }
2520
2521         ok = smbd_lock_socket_internal(sconn);
2522         if (!ok) {
2523                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2524                 DEBUG(0, ("%s: failed to lock socket\n", __location__));
2525                 return;
2526         }
2527
2528         if (!fd_is_readable(sconn->sock)) {
2529                 DEBUG(10,("echo_handler[%d] the parent smbd was faster\n",
2530                           (int)sys_getpid()));
2531
2532                 ok = smbd_unlock_socket_internal(sconn);
2533                 if (!ok) {
2534                         tevent_req_nterror(req, map_nt_error_from_unix(errno));
2535                         DEBUG(1, ("%s: failed to unlock socket\n",
2536                                 __location__));
2537                         return;
2538                 }
2539
2540                 subreq = wait_for_read_send(state, state->ev, sconn->sock);
2541                 if (tevent_req_nomem(subreq, req)) {
2542                         return;
2543                 }
2544                 tevent_req_set_callback(subreq, smbd_echo_read_readable, req);
2545                 return;
2546         }
2547
2548         status = receive_smb_talloc(state, sconn, sconn->sock, &state->buf,
2549                                     0 /* timeout */,
2550                                     &unread,
2551                                     &encrypted,
2552                                     &state->buflen,
2553                                     &state->seqnum,
2554                                     false /* trusted_channel*/);
2555
2556         if (tevent_req_nterror(req, status)) {
2557                 tevent_req_nterror(req, status);
2558                 DEBUG(1, ("echo_handler[%d]: receive_smb_raw_talloc failed: %s\n",
2559                           (int)sys_getpid(), nt_errstr(status)));
2560                 return;
2561         }
2562
2563         ok = smbd_unlock_socket_internal(sconn);
2564         if (!ok) {
2565                 tevent_req_nterror(req, map_nt_error_from_unix(errno));
2566                 DEBUG(1, ("%s: failed to unlock socket\n", __location__));
2567                 return;
2568         }
2569         tevent_req_done(req);
2570 }
2571
2572 static NTSTATUS smbd_echo_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2573                                     char **pbuf, size_t *pbuflen, uint32_t *pseqnum)
2574 {
2575         struct smbd_echo_read_state *state = tevent_req_data(
2576                 req, struct smbd_echo_read_state);
2577         NTSTATUS status;
2578
2579         if (tevent_req_is_nterror(req, &status)) {
2580                 return status;
2581         }
2582         *pbuf = talloc_move(mem_ctx, &state->buf);
2583         *pbuflen = state->buflen;
2584         *pseqnum = state->seqnum;
2585         return NT_STATUS_OK;
2586 }
2587
2588 struct smbd_echo_state {
2589         struct tevent_context *ev;
2590         struct iovec *pending;
2591         struct smbd_server_connection *sconn;
2592         int parent_pipe;
2593
2594         struct tevent_fd *parent_fde;
2595
2596         struct tevent_req *write_req;
2597 };
2598
2599 static void smbd_echo_writer_done(struct tevent_req *req);
2600
2601 static void smbd_echo_activate_writer(struct smbd_echo_state *state)
2602 {
2603         int num_pending;
2604
2605         if (state->write_req != NULL) {
2606                 return;
2607         }
2608
2609         num_pending = talloc_array_length(state->pending);
2610         if (num_pending == 0) {
2611                 return;
2612         }
2613
2614         state->write_req = writev_send(state, state->ev, NULL,
2615                                        state->parent_pipe, false,
2616                                        state->pending, num_pending);
2617         if (state->write_req == NULL) {
2618                 DEBUG(1, ("writev_send failed\n"));
2619                 exit(1);
2620         }
2621
2622         talloc_steal(state->write_req, state->pending);
2623         state->pending = NULL;
2624
2625         tevent_req_set_callback(state->write_req, smbd_echo_writer_done,
2626                                 state);
2627 }
2628
2629 static void smbd_echo_writer_done(struct tevent_req *req)
2630 {
2631         struct smbd_echo_state *state = tevent_req_callback_data(
2632                 req, struct smbd_echo_state);
2633         ssize_t written;
2634         int err;
2635
2636         written = writev_recv(req, &err);
2637         TALLOC_FREE(req);
2638         state->write_req = NULL;
2639         if (written == -1) {
2640                 DEBUG(1, ("writev to parent failed: %s\n", strerror(err)));
2641                 exit(1);
2642         }
2643         DEBUG(10,("echo_handler[%d]: forwarded pdu to main\n", (int)sys_getpid()));
2644         smbd_echo_activate_writer(state);
2645 }
2646
2647 static bool smbd_echo_reply(uint8_t *inbuf, size_t inbuf_len,
2648                             uint32_t seqnum)
2649 {
2650         struct smb_request req;
2651         uint16_t num_replies;
2652         size_t out_len;
2653         char *outbuf;
2654         bool ok;
2655
2656         if ((inbuf_len == 4) && (CVAL(inbuf, 0) == NBSSkeepalive)) {
2657                 DEBUG(10, ("Got netbios keepalive\n"));
2658                 /*
2659                  * Just swallow it
2660                  */
2661                 return true;
2662         }
2663
2664         if (inbuf_len < smb_size) {
2665                 DEBUG(10, ("Got short packet: %d bytes\n", (int)inbuf_len));
2666                 return false;
2667         }
2668         if (!valid_smb_header(inbuf)) {
2669                 DEBUG(10, ("Got invalid SMB header\n"));
2670                 return false;
2671         }
2672
2673         if (!init_smb_request(&req, smbd_server_conn, inbuf, 0, false,
2674                               seqnum)) {
2675                 return false;
2676         }
2677         req.inbuf = inbuf;
2678
2679         DEBUG(10, ("smbecho handler got cmd %d (%s)\n", (int)req.cmd,
2680                    smb_messages[req.cmd].name
2681                    ? smb_messages[req.cmd].name : "unknown"));
2682
2683         if (req.cmd != SMBecho) {
2684                 return false;
2685         }
2686         if (req.wct < 1) {
2687                 return false;
2688         }
2689
2690         num_replies = SVAL(req.vwv+0, 0);
2691         if (num_replies != 1) {
2692                 /* Not a Windows "Hey, you're still there?" request */
2693                 return false;
2694         }
2695
2696         if (!create_outbuf(talloc_tos(), &req, (const char *)req.inbuf, &outbuf,
2697                            1, req.buflen)) {
2698                 DEBUG(10, ("create_outbuf failed\n"));
2699                 return false;
2700         }
2701         req.outbuf = (uint8_t *)outbuf;
2702
2703         SSVAL(req.outbuf, smb_vwv0, num_replies);
2704
2705         if (req.buflen > 0) {
2706                 memcpy(smb_buf(req.outbuf), req.buf, req.buflen);
2707         }
2708
2709         out_len = smb_len(req.outbuf) + 4;
2710
2711         ok = srv_send_smb(req.sconn,
2712                           (char *)outbuf,
2713                           true, seqnum+1,
2714                           false, &req.pcd);
2715         TALLOC_FREE(outbuf);
2716         if (!ok) {
2717                 exit(1);
2718         }
2719
2720         return true;
2721 }
2722
2723 static void smbd_echo_exit(struct tevent_context *ev,
2724                            struct tevent_fd *fde, uint16_t flags,
2725                            void *private_data)
2726 {
2727         DEBUG(2, ("smbd_echo_exit: lost connection to parent\n"));
2728         exit(0);
2729 }
2730
2731 static void smbd_echo_got_packet(struct tevent_req *req);
2732
2733 static void smbd_echo_loop(struct smbd_server_connection *sconn,
2734                            int parent_pipe)
2735 {
2736         struct smbd_echo_state *state;
2737         struct tevent_req *read_req;
2738
2739         state = talloc_zero(sconn, struct smbd_echo_state);
2740         if (state == NULL) {
2741                 DEBUG(1, ("talloc failed\n"));
2742                 return;
2743         }
2744         state->sconn = sconn;
2745         state->parent_pipe = parent_pipe;
2746         state->ev = s3_tevent_context_init(state);
2747         if (state->ev == NULL) {
2748                 DEBUG(1, ("tevent_context_init failed\n"));
2749                 TALLOC_FREE(state);
2750                 return;
2751         }
2752         state->parent_fde = tevent_add_fd(state->ev, state, parent_pipe,
2753                                         TEVENT_FD_READ, smbd_echo_exit,
2754                                         state);
2755         if (state->parent_fde == NULL) {
2756                 DEBUG(1, ("tevent_add_fd failed\n"));
2757                 TALLOC_FREE(state);
2758                 return;
2759         }
2760
2761         read_req = smbd_echo_read_send(state, state->ev, sconn);
2762         if (read_req == NULL) {
2763                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2764                 TALLOC_FREE(state);
2765                 return;
2766         }
2767         tevent_req_set_callback(read_req, smbd_echo_got_packet, state);
2768
2769         while (true) {
2770                 if (tevent_loop_once(state->ev) == -1) {
2771                         DEBUG(1, ("tevent_loop_once failed: %s\n",
2772                                   strerror(errno)));
2773                         break;
2774                 }
2775         }
2776         TALLOC_FREE(state);
2777 }
2778
2779 static void smbd_echo_got_packet(struct tevent_req *req)
2780 {
2781         struct smbd_echo_state *state = tevent_req_callback_data(
2782                 req, struct smbd_echo_state);
2783         NTSTATUS status;
2784         char *buf = NULL;
2785         size_t buflen = 0;
2786         uint32_t seqnum = 0;
2787         bool reply;
2788
2789         status = smbd_echo_read_recv(req, state, &buf, &buflen, &seqnum);
2790         TALLOC_FREE(req);
2791         if (!NT_STATUS_IS_OK(status)) {
2792                 DEBUG(1, ("smbd_echo_read_recv returned %s\n",
2793                           nt_errstr(status)));
2794                 exit(1);
2795         }
2796
2797         reply = smbd_echo_reply((uint8_t *)buf, buflen, seqnum);
2798         if (!reply) {
2799                 size_t num_pending;
2800                 struct iovec *tmp;
2801                 struct iovec *iov;
2802
2803                 num_pending = talloc_array_length(state->pending);
2804                 tmp = talloc_realloc(state, state->pending, struct iovec,
2805                                      num_pending+1);
2806                 if (tmp == NULL) {
2807                         DEBUG(1, ("talloc_realloc failed\n"));
2808                         exit(1);
2809                 }
2810                 state->pending = tmp;
2811
2812                 if (buflen >= smb_size) {
2813                         /*
2814                          * place the seqnum in the packet so that the main process
2815                          * can reply with signing
2816                          */
2817                         SIVAL(buf, smb_ss_field, seqnum);
2818                         SIVAL(buf, smb_ss_field+4, NT_STATUS_V(NT_STATUS_OK));
2819                 }
2820
2821                 iov = &state->pending[num_pending];
2822                 iov->iov_base = buf;
2823                 iov->iov_len = buflen;
2824
2825                 DEBUG(10,("echo_handler[%d]: forward to main\n",
2826                           (int)sys_getpid()));
2827                 smbd_echo_activate_writer(state);
2828         }
2829
2830         req = smbd_echo_read_send(state, state->ev, state->sconn);
2831         if (req == NULL) {
2832                 DEBUG(1, ("smbd_echo_read_send failed\n"));
2833                 exit(1);
2834         }
2835         tevent_req_set_callback(req, smbd_echo_got_packet, state);
2836 }
2837
2838
2839 /*
2840  * Handle SMBecho requests in a forked child process
2841  */
2842 bool fork_echo_handler(struct smbd_server_connection *sconn)
2843 {
2844         int listener_pipe[2];
2845         int res;
2846         pid_t child;
2847
2848         res = pipe(listener_pipe);
2849         if (res == -1) {
2850                 DEBUG(1, ("pipe() failed: %s\n", strerror(errno)));
2851                 return false;
2852         }
2853         sconn->smb1.echo_handler.socket_lock_fd = create_unlink_tmp(lp_lockdir());
2854         if (sconn->smb1.echo_handler.socket_lock_fd == -1) {
2855                 DEBUG(1, ("Could not create lock fd: %s\n", strerror(errno)));
2856                 goto fail;
2857         }
2858
2859         child = sys_fork();
2860         if (child == 0) {
2861                 NTSTATUS status;
2862
2863                 close(listener_pipe[0]);
2864                 set_blocking(listener_pipe[1], false);
2865
2866                 status = reinit_after_fork(sconn->msg_ctx,
2867                                            server_event_context(),
2868                                            procid_self(), false);
2869                 if (!NT_STATUS_IS_OK(status)) {
2870                         DEBUG(1, ("reinit_after_fork failed: %s\n",
2871                                   nt_errstr(status)));
2872                         exit(1);
2873                 }
2874                 smbd_echo_loop(sconn, listener_pipe[1]);
2875                 exit(0);
2876         }
2877         close(listener_pipe[1]);
2878         listener_pipe[1] = -1;
2879         sconn->smb1.echo_handler.trusted_fd = listener_pipe[0];
2880
2881         DEBUG(10,("fork_echo_handler: main[%d] echo_child[%d]\n", (int)sys_getpid(), child));
2882
2883         /*
2884          * Without smb signing this is the same as the normal smbd
2885          * listener. This needs to change once signing comes in.
2886          */
2887         sconn->smb1.echo_handler.trusted_fde = event_add_fd(server_event_context(),
2888                                         sconn,
2889                                         sconn->smb1.echo_handler.trusted_fd,
2890                                         EVENT_FD_READ,
2891                                         smbd_server_echo_handler,
2892                                         sconn);
2893         if (sconn->smb1.echo_handler.trusted_fde == NULL) {
2894                 DEBUG(1, ("event_add_fd failed\n"));
2895                 goto fail;
2896         }
2897
2898         return true;
2899
2900 fail:
2901         if (listener_pipe[0] != -1) {
2902                 close(listener_pipe[0]);
2903         }
2904         if (listener_pipe[1] != -1) {
2905                 close(listener_pipe[1]);
2906         }
2907         sconn->smb1.echo_handler.trusted_fd = -1;
2908         if (sconn->smb1.echo_handler.socket_lock_fd != -1) {
2909                 close(sconn->smb1.echo_handler.socket_lock_fd);
2910         }
2911         sconn->smb1.echo_handler.trusted_fd = -1;
2912         sconn->smb1.echo_handler.socket_lock_fd = -1;
2913         return false;
2914 }
2915
2916 #if CLUSTER_SUPPORT
2917
2918 static NTSTATUS smbd_register_ips(struct smbd_server_connection *sconn,
2919                                   struct sockaddr_storage *srv,
2920                                   struct sockaddr_storage *clnt)
2921 {
2922         struct ctdbd_connection *cconn;
2923         char tmp_addr[INET6_ADDRSTRLEN];
2924         char *addr;
2925
2926         cconn = messaging_ctdbd_connection();
2927         if (cconn == NULL) {
2928                 return NT_STATUS_NO_MEMORY;
2929         }
2930
2931         client_socket_addr(sconn->sock, tmp_addr, sizeof(tmp_addr));
2932         addr = talloc_strdup(cconn, tmp_addr);
2933         if (addr == NULL) {
2934                 return NT_STATUS_NO_MEMORY;
2935         }
2936         return ctdbd_register_ips(cconn, srv, clnt, release_ip, addr);
2937 }
2938
2939 #endif
2940
2941 /****************************************************************************
2942  Process commands from the client
2943 ****************************************************************************/
2944
2945 void smbd_process(struct tevent_context *ev_ctx,
2946                   struct smbd_server_connection *sconn)
2947 {
2948         TALLOC_CTX *frame = talloc_stackframe();
2949         struct sockaddr_storage ss;
2950         struct sockaddr *sa = NULL;
2951         socklen_t sa_socklen;
2952         struct tsocket_address *local_address = NULL;
2953         struct tsocket_address *remote_address = NULL;
2954         const char *remaddr = NULL;
2955         char *rhost;
2956         int ret;
2957
2958         if (lp_maxprotocol() >= PROTOCOL_SMB2_02) {
2959                 /*
2960                  * We're not making the decision here,
2961                  * we're just allowing the client
2962                  * to decide between SMB1 and SMB2
2963                  * with the first negprot
2964                  * packet.
2965                  */
2966                 sconn->using_smb2 = true;
2967         }
2968
2969         /* Ensure child is set to blocking mode */
2970         set_blocking(sconn->sock,True);
2971
2972         set_socket_options(sconn->sock, "SO_KEEPALIVE");
2973         set_socket_options(sconn->sock, lp_socket_options());
2974
2975         sa = (struct sockaddr *)(void *)&ss;
2976         sa_socklen = sizeof(ss);
2977         ret = getpeername(sconn->sock, sa, &sa_socklen);
2978         if (ret != 0) {
2979                 int level = (errno == ENOTCONN)?2:0;
2980                 DEBUG(level,("getpeername() failed - %s\n", strerror(errno)));
2981                 exit_server_cleanly("getpeername() failed.\n");
2982         }
2983         ret = tsocket_address_bsd_from_sockaddr(sconn,
2984                                                 sa, sa_socklen,
2985                                                 &remote_address);
2986         if (ret != 0) {
2987                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
2988                         __location__, strerror(errno)));
2989                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
2990         }
2991
2992         sa = (struct sockaddr *)(void *)&ss;
2993         sa_socklen = sizeof(ss);
2994         ret = getsockname(sconn->sock, sa, &sa_socklen);
2995         if (ret != 0) {
2996                 int level = (errno == ENOTCONN)?2:0;
2997                 DEBUG(level,("getsockname() failed - %s\n", strerror(errno)));
2998                 exit_server_cleanly("getsockname() failed.\n");
2999         }
3000         ret = tsocket_address_bsd_from_sockaddr(sconn,
3001                                                 sa, sa_socklen,
3002                                                 &local_address);
3003         if (ret != 0) {
3004                 DEBUG(0,("%s: tsocket_address_bsd_from_sockaddr remote failed - %s\n",
3005                         __location__, strerror(errno)));
3006                 exit_server_cleanly("tsocket_address_bsd_from_sockaddr remote failed.\n");
3007         }
3008
3009         sconn->local_address = local_address;
3010         sconn->remote_address = remote_address;
3011
3012         if (tsocket_address_is_inet(remote_address, "ip")) {
3013                 remaddr = tsocket_address_inet_addr_string(
3014                                 sconn->remote_address,
3015                                 talloc_tos());
3016                 if (remaddr == NULL) {
3017                         DEBUG(0,("%s: tsocket_address_inet_addr_string remote failed - %s\n",
3018                                  __location__, strerror(errno)));
3019                         exit_server_cleanly("tsocket_address_inet_addr_string remote failed.\n");
3020                 }
3021         } else {
3022                 remaddr = "0.0.0.0";
3023         }
3024
3025         /* this is needed so that we get decent entries
3026            in smbstatus for port 445 connects */
3027         set_remote_machine_name(remaddr, false);
3028         reload_services(sconn->msg_ctx, sconn->sock, true);
3029
3030         /*
3031          * Before the first packet, check the global hosts allow/ hosts deny
3032          * parameters before doing any parsing of packets passed to us by the
3033          * client. This prevents attacks on our parsing code from hosts not in
3034          * the hosts allow list.
3035          */
3036
3037         ret = get_remote_hostname(remote_address,
3038                                   &rhost,
3039                                   talloc_tos());
3040         if (ret < 0) {
3041                 DEBUG(0,("%s: get_remote_hostname failed - %s\n",
3042                         __location__, strerror(errno)));
3043                 exit_server_cleanly("get_remote_hostname failed.\n");
3044         }
3045         if (strequal(rhost, "UNKNOWN")) {
3046                 rhost = talloc_strdup(talloc_tos(), remaddr);
3047         }
3048         sconn->remote_hostname = talloc_move(sconn, &rhost);
3049
3050         if (!allow_access(lp_hostsdeny(-1), lp_hostsallow(-1),
3051                           sconn->remote_hostname,
3052                           remaddr)) {
3053                 /*
3054                  * send a negative session response "not listening on calling
3055                  * name"
3056                  */
3057                 unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
3058                 DEBUG( 1, ("Connection denied from %s to %s\n",
3059                            tsocket_address_string(remote_address, talloc_tos()),
3060                            tsocket_address_string(local_address, talloc_tos())));
3061                 (void)srv_send_smb(sconn,(char *)buf, false,
3062                                    0, false, NULL);
3063                 exit_server_cleanly("connection denied");
3064         }
3065
3066         DEBUG(10, ("Connection allowed from %s to %s\n",
3067                    tsocket_address_string(remote_address, talloc_tos()),
3068                    tsocket_address_string(local_address, talloc_tos())));
3069
3070         init_modules();
3071
3072         smb_perfcount_init();
3073
3074         if (!init_account_policy()) {
3075                 exit_server("Could not open account policy tdb.\n");
3076         }
3077
3078         if (*lp_rootdir()) {
3079                 if (chroot(lp_rootdir()) != 0) {
3080                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
3081                         exit_server("Failed to chroot()");
3082                 }
3083                 if (chdir("/") == -1) {
3084                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
3085                         exit_server("Failed to chroot()");
3086                 }
3087                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
3088         }
3089
3090         if (!srv_init_signing(sconn)) {
3091                 exit_server("Failed to init smb_signing");
3092         }
3093
3094         /* Setup oplocks */
3095         if (!init_oplocks(sconn->msg_ctx))
3096                 exit_server("Failed to init oplocks");
3097
3098         /* register our message handlers */
3099         messaging_register(sconn->msg_ctx, NULL,
3100                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
3101         messaging_register(sconn->msg_ctx, NULL,
3102                            MSG_SMB_CLOSE_FILE, msg_close_file);
3103
3104         /*
3105          * Use the default MSG_DEBUG handler to avoid rebroadcasting
3106          * MSGs to all child processes
3107          */
3108         messaging_deregister(sconn->msg_ctx,
3109                              MSG_DEBUG, NULL);
3110         messaging_register(sconn->msg_ctx, NULL,
3111                            MSG_DEBUG, debug_message);
3112
3113         if ((lp_keepalive() != 0)
3114             && !(event_add_idle(ev_ctx, NULL,
3115                                 timeval_set(lp_keepalive(), 0),
3116                                 "keepalive", keepalive_fn,
3117                                 NULL))) {
3118                 DEBUG(0, ("Could not add keepalive event\n"));
3119                 exit(1);
3120         }
3121
3122         if (!(event_add_idle(ev_ctx, NULL,
3123                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
3124                              "deadtime", deadtime_fn, sconn))) {
3125                 DEBUG(0, ("Could not add deadtime event\n"));
3126                 exit(1);
3127         }
3128
3129         if (!(event_add_idle(ev_ctx, NULL,
3130                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
3131                              "housekeeping", housekeeping_fn, sconn))) {
3132                 DEBUG(0, ("Could not add housekeeping event\n"));
3133                 exit(1);
3134         }
3135
3136 #ifdef CLUSTER_SUPPORT
3137
3138         if (lp_clustering()) {
3139                 /*
3140                  * We need to tell ctdb about our client's TCP
3141                  * connection, so that for failover ctdbd can send
3142                  * tickle acks, triggering a reconnection by the
3143                  * client.
3144                  */
3145
3146                 struct sockaddr_storage srv, clnt;
3147
3148                 if (client_get_tcp_info(sconn->sock, &srv, &clnt) == 0) {
3149                         NTSTATUS status;
3150                         status = smbd_register_ips(sconn, &srv, &clnt);
3151                         if (!NT_STATUS_IS_OK(status)) {
3152                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
3153                                           nt_errstr(status)));
3154                         }
3155                 } else
3156                 {
3157                         DEBUG(0,("Unable to get tcp info for "
3158                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
3159                                  strerror(errno)));
3160                 }
3161         }
3162
3163 #endif
3164
3165         sconn->nbt.got_session = false;
3166
3167         sconn->smb1.negprot.max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
3168
3169         sconn->smb1.sessions.done_sesssetup = false;
3170         sconn->smb1.sessions.max_send = BUFFER_SIZE;
3171         sconn->smb1.sessions.last_session_tag = UID_FIELD_INVALID;
3172         /* users from session setup */
3173         sconn->smb1.sessions.session_userlist = NULL;
3174         /* workgroup from session setup. */
3175         sconn->smb1.sessions.session_workgroup = NULL;
3176         /* this holds info on user ids that are already validated for this VC */
3177         sconn->smb1.sessions.validated_users = NULL;
3178         sconn->smb1.sessions.next_vuid = VUID_OFFSET;
3179         sconn->smb1.sessions.num_validated_vuids = 0;
3180
3181         conn_init(sconn);
3182         if (!init_dptrs(sconn)) {
3183                 exit_server("init_dptrs() failed");
3184         }
3185
3186         sconn->smb1.fde = event_add_fd(ev_ctx,
3187                                                   sconn,
3188                                                   sconn->sock,
3189                                                   EVENT_FD_READ,
3190                                                   smbd_server_connection_handler,
3191                                                   sconn);
3192         if (!sconn->smb1.fde) {
3193                 exit_server("failed to create smbd_server_connection fde");
3194         }
3195
3196         TALLOC_FREE(frame);
3197
3198         while (True) {
3199                 NTSTATUS status;
3200
3201                 frame = talloc_stackframe_pool(8192);
3202
3203                 errno = 0;
3204
3205                 status = smbd_server_connection_loop_once(ev_ctx, sconn);
3206                 if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY) &&
3207                     !NT_STATUS_IS_OK(status)) {
3208                         DEBUG(3, ("smbd_server_connection_loop_once failed: %s,"
3209                                   " exiting\n", nt_errstr(status)));
3210                         break;
3211                 }
3212
3213                 TALLOC_FREE(frame);
3214         }
3215
3216         exit_server_cleanly(NULL);
3217 }