source/libsmb/clientgen.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    SMB client generic functions
   5    Copyright (C) Andrew Tridgell 1994-1998
   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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #define NO_SYSLOG
  23
  24 #include "includes.h"
  25
  26 /*
  27  * Change the port number used to call on
  28  */
  29 int cli_set_port(struct cli_state *cli, int port)
  30 {
  31         cli->port = port;
  32         return port;
  33 }
  34
  35 /****************************************************************************
  36 recv an smb
  37 ****************************************************************************/
  38 BOOL cli_receive_smb(struct cli_state *cli)
  39 {
  40         BOOL ret;
  41  again:
  42         ret = client_receive_smb(cli->fd,cli->inbuf,cli->timeout);
  43
  44         if (ret) {
  45                 /* it might be an oplock break request */
  46                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
  47                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
  48                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
  49                     SVAL(cli->inbuf,smb_vwv7) == 0) {
  50                         if (cli->oplock_handler) {
  51                                 int fnum = SVAL(cli->inbuf,smb_vwv2);
  52                                 unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
  53                                 if (!cli->oplock_handler(cli, fnum, level)) return False;
  54                         }
  55                         /* try to prevent loops */
  56                         CVAL(cli->inbuf,smb_com) = 0xFF;
  57                         goto again;
  58                 }
  59         }
  60
  61         return ret;
  62 }
  63
  64 /****************************************************************************
  65   send an smb to a fd and re-establish if necessary
  66 ****************************************************************************/
  67 BOOL cli_send_smb(struct cli_state *cli)
  68 {
  69         size_t len;
  70         size_t nwritten=0;
  71         ssize_t ret;
  72         BOOL reestablished=False;
  73
  74         len = smb_len(cli->outbuf) + 4;
  75
  76         while (nwritten < len) {
  77                 ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
  78                 if (ret <= 0 && errno == EPIPE && !reestablished) {
  79                         if (cli_reestablish_connection(cli)) {
  80                                 reestablished = True;
  81                                 nwritten=0;
  82                                 continue;
  83                         }
  84                 }
  85                 if (ret <= 0) {
  86                         DEBUG(0,("Error writing %d bytes to client. %d\n",
  87                                  (int)len,(int)ret));
  88                         return False;
  89                 }
  90                 nwritten += ret;
  91         }
  92
  93         return True;
  94 }
  95
  96 /****************************************************************************
  97 setup basics in a outgoing packet
  98 ****************************************************************************/
  99 void cli_setup_packet(struct cli_state *cli)
 100 {
 101         cli->rap_error = 0;
 102         SSVAL(cli->outbuf,smb_pid,cli->pid);
 103         SSVAL(cli->outbuf,smb_uid,cli->vuid);
 104         SSVAL(cli->outbuf,smb_mid,cli->mid);
 105         if (cli->protocol > PROTOCOL_CORE) {
 106                 uint16 flags2;
 107                 SCVAL(cli->outbuf,smb_flg,0x8);
 108                 flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 109                 if (cli->capabilities & CAP_UNICODE) {
 110                         flags2 |= FLAGS2_UNICODE_STRINGS;
 111                 }
 112                 if (cli->capabilities & CAP_STATUS32) {
 113                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 114                 }
 115                 if (cli->use_spnego) {
 116                         flags2 |= FLAGS2_EXTENDED_SECURITY;
 117                 }
 118                 SSVAL(cli->outbuf,smb_flg2, flags2);
 119         }
 120 }
 121
 122 /****************************************************************************
 123 setup the bcc length of the packet from a pointer to the end of the data
 124 ****************************************************************************/
 125 void cli_setup_bcc(struct cli_state *cli, void *p)
 126 {
 127         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 128 }
 129
 130
 131
 132 /****************************************************************************
 133 initialise a client structure
 134 ****************************************************************************/
 135 void cli_init_creds(struct cli_state *cli, const struct ntuser_creds *usr)
 136 {
 137         /* copy_nt_creds(&cli->usr, usr); */
 138         safe_strcpy(cli->domain   , usr->domain   , sizeof(usr->domain   )-1);
 139         safe_strcpy(cli->user_name, usr->user_name, sizeof(usr->user_name)-1);
 140         memcpy(&cli->pwd, &usr->pwd, sizeof(usr->pwd));
 141         cli->ntlmssp_flags = usr->ntlmssp_flags;
 142         cli->ntlmssp_cli_flgs = usr != NULL ? usr->ntlmssp_flags : 0;
 143
 144         DEBUG(10,("cli_init_creds: user %s domain %s flgs: %x\nntlmssp_cli_flgs:%x\n",
 145                cli->user_name, cli->domain,
 146                cli->ntlmssp_flags,cli->ntlmssp_cli_flgs));
 147 }
 148
 149
 150 /****************************************************************************
 151 initialise a client structure
 152 ****************************************************************************/
 153 struct cli_state *cli_initialise(struct cli_state *cli)
 154 {
 155         BOOL alloced_cli = False;
 156
 157         /* Check the effective uid - make sure we are not setuid */
 158         if (is_setuid_root()) {
 159                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 160                 return NULL;
 161         }
 162
 163         if (!cli) {
 164                 cli = (struct cli_state *)malloc(sizeof(*cli));
 165                 if (!cli)
 166                         return NULL;
 167                 ZERO_STRUCTP(cli);
 168                 alloced_cli = True;
 169         }
 170
 171         if (cli->initialised) {
 172                 cli_shutdown(cli);
 173         }
 174
 175         ZERO_STRUCTP(cli);
 176
 177         cli->port = 0;
 178         cli->fd = -1;
 179         cli->cnum = -1;
 180         cli->pid = (uint16)sys_getpid();
 181         cli->mid = 1;
 182         cli->vuid = UID_FIELD_INVALID;
 183         cli->protocol = PROTOCOL_NT1;
 184         cli->timeout = 20000; /* Timeout is in milliseconds. */
 185         cli->bufsize = CLI_BUFFER_SIZE+4;
 186         cli->max_xmit = cli->bufsize;
 187         cli->outbuf = (char *)malloc(cli->bufsize);
 188         cli->inbuf = (char *)malloc(cli->bufsize);
 189         cli->oplock_handler = cli_oplock_ack;
 190         cli->use_spnego = True;
 191
 192         if (!cli->outbuf || !cli->inbuf)
 193                 goto error;
 194
 195         if ((cli->mem_ctx = talloc_init()) == NULL)
 196                 goto error;
 197
 198         memset(cli->outbuf, 0, cli->bufsize);
 199         memset(cli->inbuf, 0, cli->bufsize);
 200
 201         cli->nt_pipe_fnum = 0;
 202
 203         cli->initialised = 1;
 204
 205         return cli;
 206
 207         /* Clean up after malloc() error */
 208
 209  error:
 210
 211         SAFE_FREE(cli->inbuf);
 212         SAFE_FREE(cli->outbuf);
 213
 214         if (alloced_cli)
 215                 SAFE_FREE(cli);
 216
 217         return NULL;
 218 }
 219
 220 /****************************************************************************
 221 shutdown a client structure
 222 ****************************************************************************/
 223 void cli_shutdown(struct cli_state *cli)
 224 {
 225         SAFE_FREE(cli->outbuf);
 226         SAFE_FREE(cli->inbuf);
 227
 228         data_blob_free(&cli->secblob);
 229
 230         if (cli->mem_ctx)
 231                 talloc_destroy(cli->mem_ctx);
 232
 233 #ifdef WITH_SSL
 234         if (cli->fd != -1)
 235                 sslutil_disconnect(cli->fd);
 236 #endif /* WITH_SSL */
 237         if (cli->fd != -1)
 238                 close(cli->fd);
 239         memset(cli, 0, sizeof(*cli));
 240 }
 241
 242
 243 /****************************************************************************
 244 set socket options on a open connection
 245 ****************************************************************************/
 246 void cli_sockopt(struct cli_state *cli, char *options)
 247 {
 248         set_socket_options(cli->fd, options);
 249 }
 250
 251 /****************************************************************************
 252 set the PID to use for smb messages. Return the old pid.
 253 ****************************************************************************/
 254 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 255 {
 256         uint16 ret = cli->pid;
 257         cli->pid = pid;
 258         return ret;
 259 }