source3/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                 SCVAL(cli->outbuf,smb_flg,0x8);
 110                 SSVAL(cli->outbuf,smb_flg2,0x1);
 111         }
 112 }
 113
 114
 115
 116 /****************************************************************************
 117 process an oplock break request from the server
 118 ****************************************************************************/
 119 static void cli_process_oplock(struct cli_state *cli)
 120 {
 121         char *oldbuf = cli->outbuf;
 122         pstring buf;
 123         int fnum;
 124
 125         fnum = SVAL(cli->inbuf,smb_vwv2);
 126
 127         /* damn, we really need to keep a record of open files so we
 128            can detect a oplock break and a close crossing on the
 129            wire. for now this swallows the errors */
 130         if (fnum == 0) return;
 131
 132         cli->outbuf = buf;
 133
 134         memset(buf,'\0',smb_size);
 135         set_message(buf,8,0,True);
 136
 137         CVAL(buf,smb_com) = SMBlockingX;
 138         SSVAL(buf,smb_tid, cli->cnum);
 139         cli_setup_packet(cli);
 140         SSVAL(buf,smb_vwv0,0xFF);
 141         SSVAL(buf,smb_vwv1,0);
 142         SSVAL(buf,smb_vwv2,fnum);
 143         SSVAL(buf,smb_vwv3,2); /* oplock break ack */
 144         SIVAL(buf,smb_vwv4,0); /* timoeut */
 145         SSVAL(buf,smb_vwv6,0); /* unlockcount */
 146         SSVAL(buf,smb_vwv7,0); /* lockcount */
 147
 148         cli_send_smb(cli);
 149
 150         cli->outbuf = oldbuf;
 151 }
 152
 153
 154 /****************************************************************************
 155 initialise a client structure
 156 ****************************************************************************/
 157 struct cli_state *cli_initialise(struct cli_state *cli)
 158 {
 159         if (!cli) {
 160                 cli = (struct cli_state *)malloc(sizeof(*cli));
 161                 if (!cli)
 162                         return NULL;
 163                 ZERO_STRUCTP(cli);
 164         }
 165
 166         if (cli->initialised) {
 167                 cli_shutdown(cli);
 168         }
 169
 170         ZERO_STRUCTP(cli);
 171
 172         cli->port = 0;
 173         cli->fd = -1;
 174         cli->cnum = -1;
 175         cli->pid = (uint16)sys_getpid();
 176         cli->mid = 1;
 177         cli->vuid = UID_FIELD_INVALID;
 178         cli->protocol = PROTOCOL_NT1;
 179         cli->timeout = 20000; /* Timeout is in milliseconds. */
 180         cli->bufsize = CLI_BUFFER_SIZE+4;
 181         cli->max_xmit = cli->bufsize;
 182         cli->outbuf = (char *)malloc(cli->bufsize);
 183         cli->inbuf = (char *)malloc(cli->bufsize);
 184         if (!cli->outbuf || !cli->inbuf)
 185         {
 186                 return False;
 187         }
 188
 189         memset(cli->outbuf, '\0', cli->bufsize);
 190         memset(cli->inbuf, '\0', cli->bufsize);
 191
 192         cli->initialised = 1;
 193
 194         return cli;
 195 }
 196
 197 /****************************************************************************
 198 shutdown a client structure
 199 ****************************************************************************/
 200 void cli_shutdown(struct cli_state *cli)
 201 {
 202         if (cli->outbuf)
 203         {
 204                 free(cli->outbuf);
 205         }
 206         if (cli->inbuf)
 207         {
 208                 free(cli->inbuf);
 209         }
 210 #ifdef WITH_SSL
 211     if (cli->fd != -1)
 212       sslutil_disconnect(cli->fd);
 213 #endif /* WITH_SSL */
 214         if (cli->fd != -1)
 215       close(cli->fd);
 216         memset(cli, 0, sizeof(*cli));
 217 }
 218
 219
 220 /****************************************************************************
 221 set socket options on a open connection
 222 ****************************************************************************/
 223 void cli_sockopt(struct cli_state *cli, char *options)
 224 {
 225         set_socket_options(cli->fd, options);
 226 }
 227
 228 /****************************************************************************
 229 set the PID to use for smb messages. Return the old pid.
 230 ****************************************************************************/
 231 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 232 {
 233         uint16 ret = cli->pid;
 234         cli->pid = pid;
 235         return ret;
 236 }
 237