source3/libsmb/clidgram.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    client dgram calls
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Richard Sharpe 2001
   7    Copyright (C) John Terpstra 2001
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #define NO_SYSLOG
  25
  26 #include "includes.h"
  27
  28 /*
  29  * cli_send_mailslot, send a mailslot for client code ...
  30  */
  31
  32 static int dgram_sock = -1;
  33
  34 int cli_send_mailslot(BOOL unique, char *mailslot, char *buf, int len,
  35                       const char *srcname, int src_type,
  36                       const char *dstname, int dest_type,
  37                       struct in_addr dest_ip, struct in_addr src_ip,
  38                       int dest_port)
  39 {
  40   struct packet_struct p;
  41   struct dgram_packet *dgram = &p.packet.dgram;
  42   struct sockaddr_in sock_out;
  43   char *ptr, *p2;
  44   char tmp[4];
  45   int name_size;
  46
  47   bzero((char *)&p, sizeof(p));
  48
  49   /*
  50    * First, check if we have an open socket to the dest IP
  51    */
  52
  53   if (dgram_sock < 1) {
  54
  55     if ((dgram_sock = open_socket_out(SOCK_DGRAM, &dest_ip, 138, LONG_CONNECT_TIMEOUT)) < 0) {
  56
  57       DEBUG(4, ("open_sock_out failed ..."));
  58       return False;
  59
  60     }
  61
  62     /* Make it a broadcast socket ... */
  63
  64     set_socket_options(dgram_sock, "SO_BROADCAST");
  65
  66     /* Now, bind my addr to it ... */
  67
  68     bzero((char *)&sock_out, sizeof(sock_out));
  69     sock_out.sin_addr.s_addr = INADDR_ANY;
  70     sock_out.sin_port = htons(138);
  71     sock_out.sin_family = AF_INET;
  72
  73     if (bind(dgram_sock, (struct sockaddr_in *)&sock_out, sizeof(sock_out)) < 0) {
  74
  75       /* Try again on any port ... */
  76
  77       sock_out.sin_port = INADDR_ANY;
  78
  79       if (bind(dgram_sock, (struct sockaddr_in *)&sock_out, sizeof(sock_out)) < 0) {
  80
  81         DEBUG(4, ("failed to bind socket to address ...\n"));
  82         return False;
  83
  84       }
  85
  86     }
  87
  88   }
  89
  90   /* Now, figure out what socket name we were bound to. We want the port */
  91
  92   name_size = sizeof(sock_out);
  93
  94   getsockname(dgram_sock, (struct sockaddr_in *)&sock_out, &name_size);
  95
  96   fprintf(stderr, "Socket bound to IP:%s, port: %d\n", inet_ntoa(sock_out.sin_addr), ntohs(sock_out.sin_port));
  97
  98   /*
  99    * Next, build the DGRAM ...
 100    */
 101
 102   /* DIRECT GROUP or UNIQUE datagram. */
 103   dgram->header.msg_type = unique ? 0x10 : 0x11;
 104   dgram->header.flags.node_type = M_NODE;
 105   dgram->header.flags.first = True;
 106   dgram->header.flags.more = False;
 107   dgram->header.dgm_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) + ((unsigned)sys_getpid()%(unsigned)100);
 108   dgram->header.source_ip.s_addr = sock_out.sin_addr.s_addr;
 109   fprintf(stderr, "Source IP = %0X\n", dgram->header.source_ip);
 110   dgram->header.source_port = ntohs(sock_out.sin_port);
 111   fprintf(stderr, "Source Port = %0X\n", dgram->header.source_port);
 112   dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
 113   dgram->header.packet_offset = 0;
 114
 115   make_nmb_name(&dgram->source_name,srcname,src_type);
 116   make_nmb_name(&dgram->dest_name,dstname,dest_type);
 117
 118   ptr = &dgram->data[0];
 119
 120   /* Setup the smb part. */
 121   ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
 122   memcpy(tmp,ptr,4);
 123   set_message(ptr,17,17 + len,True);
 124   memcpy(ptr,tmp,4);
 125
 126   CVAL(ptr,smb_com) = SMBtrans;
 127   SSVAL(ptr,smb_vwv1,len);
 128   SSVAL(ptr,smb_vwv11,len);
 129   SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
 130   SSVAL(ptr,smb_vwv13,3);
 131   SSVAL(ptr,smb_vwv14,1);
 132   SSVAL(ptr,smb_vwv15,1);
 133   SSVAL(ptr,smb_vwv16,2);
 134   p2 = smb_buf(ptr);
 135   pstrcpy(p2,mailslot);
 136   p2 = skip_string(p2,1);
 137
 138   memcpy(p2,buf,len);
 139   p2 += len;
 140
 141   dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
 142
 143   p.ip = dest_ip;
 144   p.port = dest_port;
 145   p.fd = dgram_sock;
 146   p.timestamp = time(NULL);
 147   p.packet_type = DGRAM_PACKET;
 148
 149   DEBUG(4,("send_mailslot: Sending to mailslot %s from %s IP %s ", mailslot,
 150                     nmb_namestr(&dgram->source_name), inet_ntoa(src_ip)));
 151   DEBUG(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), inet_ntoa(dest_ip)));
 152
 153   return send_packet(&p);
 154
 155 }
 156
 157 /*
 158  * cli_get_response: Get a response ...
 159  */
 160 int cli_get_response(BOOL unique, char *mailslot, char *buf, int bufsiz)
 161 {
 162   struct packet_struct *packet;
 163
 164   packet = receive_dgram_packet(dgram_sock, 2, mailslot);
 165
 166   if (packet) { /* We got one, pull what we want out of the SMB data ... */
 167
 168     struct dgram_packet *dgram = &packet->packet.dgram;
 169
 170     /*
 171      * We should probably parse the SMB, but for now, we will pull what
 172      * from fixed, known locations ...
 173      */
 174
 175     /* Copy the data to buffer, respecting sizes ... */
 176
 177     bcopy(&dgram->data[92], buf, MIN(bufsiz, (dgram->datasize - 92)));
 178
 179   }
 180   else
 181     return -1;
 182
 183 }
 184
 185 /*
 186  * cli_get_backup_list: Send a get backup list request ...
 187  */
 188
 189 static char cli_backup_list[1024];
 190
 191 int cli_get_backup_list(const char *myname, const char *send_to_name)
 192 {
 193   char outbuf[15];
 194   char *p;
 195   struct in_addr sendto_ip, my_ip;
 196
 197   if (!resolve_name(send_to_name, &sendto_ip, 0x1d)) {
 198
 199     fprintf(stderr, "Could not resolve name: %s<1D>\n", send_to_name);
 200
 201   }
 202
 203   my_ip.s_addr = inet_addr("0.0.0.0");
 204
 205   if (!resolve_name(myname, &my_ip, 0x00)) { /* FIXME: Call others here */
 206
 207     fprintf(stderr, "Could not resolve name: %s<00>\n", myname);
 208
 209   }
 210
 211   bzero(cli_backup_list, sizeof(cli_backup_list));
 212   bzero(outbuf, sizeof(outbuf));
 213
 214   p = outbuf;
 215
 216   SCVAL(p, 0, ANN_GetBackupListReq);
 217   p++;
 218
 219   SCVAL(p, 0, 1); /* Count pointer ... */
 220   p++;
 221
 222   SIVAL(p, 0, 1); /* The sender's token ... */
 223   p += 4;
 224
 225   cli_send_mailslot(True, "\\MAILSLOT\\BROWSE", outbuf, PTR_DIFF(p, outbuf),
 226                     myname, 0, send_to_name, 0x1d, sendto_ip, my_ip, 138);
 227
 228   /* We should check the error and return if we got one */
 229
 230   /* Now, get the response ... */
 231
 232   cli_get_response(True, "\\MAILSLOT\\BROWSE", cli_backup_list, sizeof(cli_backup_list));
 233
 234   /* Should check the response here ... FIXME */
 235
 236 }
 237
 238 /*
 239  * cli_get_backup_server: Get the backup list and retrieve a server from it
 240  */
 241
 242 int cli_get_backup_server(char *my_name, char *target, char *servername, int namesize)
 243 {
 244
 245   /* Get the backup list first. We could pull this from the cache later */
 246
 247   cli_get_backup_list(my_name, target);  /* FIXME: Check the response */
 248
 249   strncpy(servername, cli_backup_list, MIN(16, namesize));
 250
 251 }