source3/libsmb/clientgen.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client generic functions
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #define NO_SYSLOG
  22
  23 #include "includes.h"
  24
  25 /*
  26  * Change the port number used to call on
  27  */
  28 int cli_set_port(struct cli_state *cli, int port)
  29 {
  30         cli->port = port;
  31         return port;
  32 }
  33
  34 /****************************************************************************
  35   read an smb from a fd ignoring all keepalive packets. Note that the buffer
  36   *MUST* be of size BUFFER_SIZE+SAFETY_MARGIN.
  37   The timeout is in milliseconds
  38
  39   This is exactly the same as receive_smb except that it never returns
  40   a session keepalive packet (just as receive_smb used to do).
  41   receive_smb was changed to return keepalives as the oplock processing means this call
  42   should never go into a blocking read.
  43 ****************************************************************************/
  44
  45 static BOOL client_receive_smb(int fd,char *buffer, unsigned int timeout)
  46 {
  47   BOOL ret;
  48
  49   for(;;)
  50   {
  51     ret = receive_smb(fd, buffer, timeout);
  52
  53     if (!ret)
  54     {
  55       DEBUG(10,("client_receive_smb failed\n"));
  56       show_msg(buffer);
  57       return ret;
  58     }
  59
  60     /* Ignore session keepalive packets. */
  61     if(CVAL(buffer,0) != SMBkeepalive)
  62       break;
  63   }
  64   show_msg(buffer);
  65   return ret;
  66 }
  67
  68
  69 /****************************************************************************
  70 recv an smb
  71 ****************************************************************************/
  72 BOOL cli_receive_smb(struct cli_state *cli)
  73 {
  74         BOOL ret;
  75
  76         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
  77         if (cli->fd == -1) return False;
  78
  79  again:
  80         ret = client_receive_smb(cli->fd,cli->inbuf,cli->timeout);
  81
  82         if (ret) {
  83                 /* it might be an oplock break request */
  84                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
  85                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
  86                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
  87                     SVAL(cli->inbuf,smb_vwv7) == 0) {
  88                         if (cli->oplock_handler) {
  89                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
  90                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
  91                                 if (!cli->oplock_handler(cli, fnum, level)) return False;
  92                         }
  93                         /* try to prevent loops */
  94                         SCVAL(cli->inbuf,smb_com,0xFF);
  95                         goto again;
  96                 }
  97         }
  98
  99         /* If the server is not responding, note that now */
 100
 101         if (!ret) {
 102                 close(cli->fd);
 103                 cli->fd = -1;
 104         }
 105
 106         return ret;
 107 }
 108
 109 /****************************************************************************
 110  Send an smb to a fd.
 111 ****************************************************************************/
 112
 113 BOOL cli_send_smb(struct cli_state *cli)
 114 {
 115         size_t len;
 116         size_t nwritten=0;
 117         ssize_t ret;
 118
 119         /* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
 120         if (cli->fd == -1)
 121                 return False;
 122
 123         cli_caclulate_sign_mac(cli);
 124
 125         len = smb_len(cli->outbuf) + 4;
 126
 127         while (nwritten < len) {
 128                 ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
 129                 if (ret <= 0) {
 130                         close(cli->fd);
 131                         cli->fd = -1;
 132                         DEBUG(0,("Error writing %d bytes to client. %d\n", (int)len,(int)ret));
 133                         return False;
 134                 }
 135                 nwritten += ret;
 136         }
 137         return True;
 138 }
 139
 140 /****************************************************************************
 141  Setup basics in a outgoing packet.
 142 ****************************************************************************/
 143
 144 void cli_setup_packet(struct cli_state *cli)
 145 {
 146         cli->rap_error = 0;
 147         SSVAL(cli->outbuf,smb_pid,cli->pid);
 148         SSVAL(cli->outbuf,smb_uid,cli->vuid);
 149         SSVAL(cli->outbuf,smb_mid,cli->mid);
 150         if (cli->protocol > PROTOCOL_CORE) {
 151                 uint16 flags2;
 152                 SCVAL(cli->outbuf,smb_flg,0x8);
 153                 flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 154                 if (cli->capabilities & CAP_UNICODE) {
 155                         flags2 |= FLAGS2_UNICODE_STRINGS;
 156                 }
 157                 if (cli->capabilities & CAP_STATUS32) {
 158                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 159                 }
 160                 if (cli->use_spnego) {
 161                         flags2 |= FLAGS2_EXTENDED_SECURITY;
 162                 }
 163                 if (cli->sign_info.use_smb_signing
 164                     || cli->sign_info.temp_smb_signing)
 165                         flags2 |= FLAGS2_SMB_SECURITY_SIGNATURES;
 166                 SSVAL(cli->outbuf,smb_flg2, flags2);
 167         }
 168 }
 169
 170 /****************************************************************************
 171 setup the bcc length of the packet from a pointer to the end of the data
 172 ****************************************************************************/
 173 void cli_setup_bcc(struct cli_state *cli, void *p)
 174 {
 175         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 176 }
 177
 178
 179
 180 /****************************************************************************
 181 initialise credentials of a client structure
 182 ****************************************************************************/
 183 void cli_init_creds(struct cli_state *cli, const struct ntuser_creds *usr)
 184 {
 185         /* copy_nt_creds(&cli->usr, usr); */
 186         safe_strcpy(cli->domain   , usr->domain   , sizeof(usr->domain   )-1);
 187         safe_strcpy(cli->user_name, usr->user_name, sizeof(usr->user_name)-1);
 188         memcpy(&cli->pwd, &usr->pwd, sizeof(usr->pwd));
 189         cli->ntlmssp_flags = usr->ntlmssp_flags;
 190         cli->ntlmssp_cli_flgs = usr != NULL ? usr->ntlmssp_flags : 0;
 191
 192         DEBUG(10,("cli_init_creds: user %s domain %s flgs: %x\nntlmssp_cli_flgs:%x\n",
 193                cli->user_name, cli->domain,
 194                cli->ntlmssp_flags,cli->ntlmssp_cli_flgs));
 195 }
 196
 197
 198 /****************************************************************************
 199 initialise a client structure
 200 ****************************************************************************/
 201 struct cli_state *cli_initialise(struct cli_state *cli)
 202 {
 203         BOOL alloced_cli = False;
 204
 205         /* Check the effective uid - make sure we are not setuid */
 206         if (is_setuid_root()) {
 207                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 208                 return NULL;
 209         }
 210
 211         if (!cli) {
 212                 cli = (struct cli_state *)malloc(sizeof(*cli));
 213                 if (!cli)
 214                         return NULL;
 215                 ZERO_STRUCTP(cli);
 216                 alloced_cli = True;
 217         }
 218
 219         if (cli->initialised) {
 220                 cli_shutdown(cli);
 221         }
 222
 223         ZERO_STRUCTP(cli);
 224
 225         cli->port = 0;
 226         cli->fd = -1;
 227         cli->cnum = -1;
 228         cli->pid = (uint16)sys_getpid();
 229         cli->mid = 1;
 230         cli->vuid = UID_FIELD_INVALID;
 231         cli->protocol = PROTOCOL_NT1;
 232         cli->timeout = 20000; /* Timeout is in milliseconds. */
 233         cli->bufsize = CLI_BUFFER_SIZE+4;
 234         cli->max_xmit = cli->bufsize;
 235         cli->outbuf = (char *)malloc(cli->bufsize);
 236         cli->inbuf = (char *)malloc(cli->bufsize);
 237         cli->oplock_handler = cli_oplock_ack;
 238         if (lp_use_spnego()) {
 239                 cli->use_spnego = True;
 240         }
 241
 242         /* Set the CLI_FORCE_DOSERR environment variable to test
 243            client routines using DOS errors instead of STATUS32
 244            ones.  This intended only as a temporary hack. */
 245         if (getenv("CLI_FORCE_DOSERR")) {
 246                 cli->force_dos_errors = True;
 247         }
 248
 249         /* A way to attempt to force SMB signing */
 250         if (getenv("CLI_FORCE_SMB_SIGNING"))
 251                 cli->sign_info.negotiated_smb_signing = True;
 252
 253         if (!cli->outbuf || !cli->inbuf)
 254                 goto error;
 255
 256         if ((cli->mem_ctx = talloc_init_named("cli based talloc")) == NULL)
 257                 goto error;
 258
 259         memset(cli->outbuf, 0, cli->bufsize);
 260         memset(cli->inbuf, 0, cli->bufsize);
 261
 262         cli->nt_pipe_fnum = 0;
 263
 264         cli->initialised = 1;
 265         cli->allocated = alloced_cli;
 266
 267         return cli;
 268
 269         /* Clean up after malloc() error */
 270
 271  error:
 272
 273         SAFE_FREE(cli->inbuf);
 274         SAFE_FREE(cli->outbuf);
 275
 276         if (alloced_cli)
 277                 SAFE_FREE(cli);
 278
 279         return NULL;
 280 }
 281
 282 /****************************************************************************
 283 shutdown a client structure
 284 ****************************************************************************/
 285 void cli_shutdown(struct cli_state *cli)
 286 {
 287         BOOL allocated;
 288         SAFE_FREE(cli->outbuf);
 289         SAFE_FREE(cli->inbuf);
 290
 291         data_blob_free(&cli->secblob);
 292
 293         if (cli->mem_ctx)
 294                 talloc_destroy(cli->mem_ctx);
 295
 296         if (cli->fd != -1)
 297                 close(cli->fd);
 298         allocated = cli->allocated;
 299         ZERO_STRUCTP(cli);
 300         if (allocated) {
 301                 free(cli);
 302         }
 303 }
 304
 305
 306 /****************************************************************************
 307 set socket options on a open connection
 308 ****************************************************************************/
 309 void cli_sockopt(struct cli_state *cli, char *options)
 310 {
 311         set_socket_options(cli->fd, options);
 312 }
 313
 314 /****************************************************************************
 315 set the PID to use for smb messages. Return the old pid.
 316 ****************************************************************************/
 317 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 318 {
 319         uint16 ret = cli->pid;
 320         cli->pid = pid;
 321         return ret;
 322 }