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 extern int DEBUGLEVEL;
  28 static void cli_process_oplock(struct cli_state *cli);
  29
  30 /*
  31  * Change the port number used to call on
  32  */
  33 int cli_set_port(struct cli_state *cli, int port)
  34 {
  35         if (port > 0)
  36           cli->port = port;
  37
  38         return cli->port;
  39 }
  40
  41 /****************************************************************************
  42 recv an smb
  43 ****************************************************************************/
  44 BOOL cli_receive_smb(struct cli_state *cli)
  45 {
  46         BOOL ret;
  47  again:
  48         ret = client_receive_smb(cli->fd,cli->inbuf,cli->timeout);
  49
  50         if (ret) {
  51                 /* it might be an oplock break request */
  52                 if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
  53                     CVAL(cli->inbuf,smb_com) == SMBlockingX &&
  54                     SVAL(cli->inbuf,smb_vwv6) == 0 &&
  55                     SVAL(cli->inbuf,smb_vwv7) == 0) {
  56                         if (cli->use_oplocks) cli_process_oplock(cli);
  57                         /* try to prevent loops */
  58                         CVAL(cli->inbuf,smb_com) = 0xFF;
  59                         goto again;
  60                 }
  61         }
  62
  63         return ret;
  64 }
  65
  66 /****************************************************************************
  67   send an smb to a fd and re-establish if necessary
  68 ****************************************************************************/
  69 BOOL cli_send_smb(struct cli_state *cli)
  70 {
  71         size_t len;
  72         size_t nwritten=0;
  73         ssize_t ret;
  74         BOOL reestablished=False;
  75
  76         len = smb_len(cli->outbuf) + 4;
  77
  78         while (nwritten < len) {
  79                 ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
  80                 if (ret <= 0 && errno == EPIPE && !reestablished) {
  81                         if (cli_reestablish_connection(cli)) {
  82                                 reestablished = True;
  83                                 nwritten=0;
  84                                 continue;
  85                         }
  86                 }
  87                 if (ret <= 0) {
  88                         DEBUG(0,("Error writing %d bytes to client. %d\n",
  89                                  (int)len,(int)ret));
  90                         return False;
  91                 }
  92                 nwritten += ret;
  93         }
  94
  95         return True;
  96 }
  97
  98 /****************************************************************************
  99 setup basics in a outgoing packet
 100 ****************************************************************************/
 101 void cli_setup_packet(struct cli_state *cli)
 102 {
 103         cli->rap_error = 0;
 104         cli->nt_error = 0;
 105         SSVAL(cli->outbuf,smb_pid,cli->pid);
 106         SSVAL(cli->outbuf,smb_uid,cli->vuid);
 107         SSVAL(cli->outbuf,smb_mid,cli->mid);
 108         if (cli->protocol > PROTOCOL_CORE) {
 109                 uint16 flags2;
 110                 SCVAL(cli->outbuf,smb_flg,0x8);
 111                 flags2 = FLAGS2_LONG_PATH_COMPONENTS;
 112                 if (cli->capabilities & CAP_UNICODE) {
 113                         flags2 |= FLAGS2_UNICODE_STRINGS;
 114                 }
 115                 SSVAL(cli->outbuf,smb_flg2, flags2);
 116         }
 117 }
 118
 119 /****************************************************************************
 120 setup the bcc length of the packet from a pointer to the end of the data
 121 ****************************************************************************/
 122 void cli_setup_bcc(struct cli_state *cli, void *p)
 123 {
 124         set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
 125 }
 126
 127
 128 /****************************************************************************
 129 process an oplock break request from the server
 130 ****************************************************************************/
 131 static void cli_process_oplock(struct cli_state *cli)
 132 {
 133         char *oldbuf = cli->outbuf;
 134         pstring buf;
 135         int fnum;
 136         unsigned char level;
 137
 138         fnum = SVAL(cli->inbuf,smb_vwv2);
 139         level = CVAL(cli->inbuf,smb_vwv3+1);
 140
 141         /* damn, we really need to keep a record of open files so we
 142            can detect a oplock break and a close crossing on the
 143            wire. for now this swallows the errors */
 144         if (fnum == 0) return;
 145
 146         /* Ignore level II break to none's. */
 147         if (level == OPLOCKLEVEL_NONE)
 148                 return;
 149
 150         cli->outbuf = buf;
 151
 152         memset(buf,'\0',smb_size);
 153         set_message(buf,8,0,True);
 154
 155         CVAL(buf,smb_com) = SMBlockingX;
 156         SSVAL(buf,smb_tid, cli->cnum);
 157         cli_setup_packet(cli);
 158         SSVAL(buf,smb_vwv0,0xFF);
 159         SSVAL(buf,smb_vwv1,0);
 160         SSVAL(buf,smb_vwv2,fnum);
 161         if (cli->use_level_II_oplocks)
 162                 SSVAL(buf,smb_vwv3,0x102); /* levelII oplock break ack */
 163         else
 164                 SSVAL(buf,smb_vwv3,2); /* exclusive oplock break ack */
 165         SIVAL(buf,smb_vwv4,0); /* timoeut */
 166         SSVAL(buf,smb_vwv6,0); /* unlockcount */
 167         SSVAL(buf,smb_vwv7,0); /* lockcount */
 168
 169         cli_send_smb(cli);
 170
 171         cli->outbuf = oldbuf;
 172 }
 173
 174 /****************************************************************************
 175 initialise a client structure
 176 ****************************************************************************/
 177 void cli_init_creds(struct cli_state *cli, const struct ntuser_creds *usr)
 178 {
 179         /* copy_nt_creds(&cli->usr, usr); */
 180         safe_strcpy(cli->domain   , usr->domain   , sizeof(usr->domain   )-1);
 181         safe_strcpy(cli->user_name, usr->user_name, sizeof(usr->user_name)-1);
 182         memcpy(&cli->pwd, &usr->pwd, sizeof(usr->pwd));
 183         cli->ntlmssp_flags = usr->ntlmssp_flags;
 184         cli->ntlmssp_cli_flgs = usr != NULL ? usr->ntlmssp_flags : 0;
 185
 186         DEBUG(10,("cli_init_creds: user %s domain %s flgs: %x\nntlmssp_cli_flgs:%x\n",
 187                cli->user_name, cli->domain,
 188                cli->ntlmssp_flags,cli->ntlmssp_cli_flgs));
 189 }
 190
 191
 192 /****************************************************************************
 193 initialise a client structure
 194 ****************************************************************************/
 195 struct cli_state *cli_initialise(struct cli_state *cli)
 196 {
 197         if (!cli) {
 198                 cli = (struct cli_state *)malloc(sizeof(*cli));
 199                 if (!cli)
 200                         return NULL;
 201                 ZERO_STRUCTP(cli);
 202         }
 203
 204         if (cli->initialised) {
 205                 cli_shutdown(cli);
 206         }
 207
 208         ZERO_STRUCTP(cli);
 209
 210         cli->port = 0;
 211         cli->fd = -1;
 212         cli->cnum = -1;
 213         cli->pid = (uint16)sys_getpid();
 214         cli->mid = 1;
 215         cli->vuid = UID_FIELD_INVALID;
 216         cli->protocol = PROTOCOL_NT1;
 217         cli->timeout = 20000; /* Timeout is in milliseconds. */
 218         cli->bufsize = CLI_BUFFER_SIZE+4;
 219         cli->max_xmit = cli->bufsize;
 220         cli->outbuf = (char *)malloc(cli->bufsize);
 221         cli->inbuf = (char *)malloc(cli->bufsize);
 222         if (!cli->outbuf || !cli->inbuf)
 223         {
 224                 return NULL;
 225         }
 226
 227         if ((cli->mem_ctx = talloc_init()) == NULL) {
 228                 free(cli->outbuf);
 229                 free(cli->inbuf);
 230                 return NULL;
 231         }
 232
 233         memset(cli->outbuf, '\0', cli->bufsize);
 234         memset(cli->inbuf, '\0', cli->bufsize);
 235
 236         cli->nt_pipe_fnum = 0;
 237
 238         cli->initialised = 1;
 239
 240         return cli;
 241 }
 242
 243 /****************************************************************************
 244 shutdown a client structure
 245 ****************************************************************************/
 246 void cli_shutdown(struct cli_state *cli)
 247 {
 248         if (cli->outbuf)
 249         {
 250                 free(cli->outbuf);
 251         }
 252         if (cli->inbuf)
 253         {
 254                 free(cli->inbuf);
 255         }
 256
 257         if (cli->mem_ctx)
 258                 talloc_destroy(cli->mem_ctx);
 259
 260 #ifdef WITH_SSL
 261     if (cli->fd != -1)
 262       sslutil_disconnect(cli->fd);
 263 #endif /* WITH_SSL */
 264         if (cli->fd != -1)
 265       close(cli->fd);
 266         memset(cli, 0, sizeof(*cli));
 267 }
 268
 269
 270 /****************************************************************************
 271 set socket options on a open connection
 272 ****************************************************************************/
 273 void cli_sockopt(struct cli_state *cli, char *options)
 274 {
 275         set_socket_options(cli->fd, options);
 276 }
 277
 278 /****************************************************************************
 279 set the PID to use for smb messages. Return the old pid.
 280 ****************************************************************************/
 281 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 282 {
 283         uint16 ret = cli->pid;
 284         cli->pid = pid;
 285         return ret;
 286 }
 287