source/libsmb/namequery.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    name query routines
   5    Copyright (C) Andrew Tridgell 1994-1997
   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
  23 #include "includes.h"
  24
  25 extern pstring scope;
  26 extern int DEBUGLEVEL;
  27
  28
  29 /****************************************************************************
  30 interpret a node status response
  31 ****************************************************************************/
  32 static void _interpret_node_status(char *p, char *master,char *rname)
  33 {
  34   int numnames = CVAL(p,0);
  35   DEBUG(1,("received %d names\n",numnames));
  36
  37   if (rname) *rname = 0;
  38   if (master) *master = 0;
  39
  40   p += 1;
  41   while (numnames--)
  42     {
  43       char qname[17];
  44       int type;
  45       fstring flags;
  46       int i;
  47       *flags = 0;
  48       StrnCpy(qname,p,15);
  49       type = CVAL(p,15);
  50       p += 16;
  51
  52       strcat(flags, (p[0] & 0x80) ? "<GROUP> " : "        ");
  53       if ((p[0] & 0x60) == 0x00) strcat(flags,"B ");
  54       if ((p[0] & 0x60) == 0x20) strcat(flags,"P ");
  55       if ((p[0] & 0x60) == 0x40) strcat(flags,"M ");
  56       if ((p[0] & 0x60) == 0x60) strcat(flags,"H ");
  57       if (p[0] & 0x10) strcat(flags,"<DEREGISTERING> ");
  58       if (p[0] & 0x08) strcat(flags,"<CONFLICT> ");
  59       if (p[0] & 0x04) strcat(flags,"<ACTIVE> ");
  60       if (p[0] & 0x02) strcat(flags,"<PERMANENT> ");
  61
  62       if (master && !*master && type == 0x1d) {
  63         StrnCpy(master,qname,15);
  64         trim_string(master,NULL," ");
  65       }
  66
  67       if (rname && !*rname && type == 0x20 && !(p[0]&0x80)) {
  68         StrnCpy(rname,qname,15);
  69         trim_string(rname,NULL," ");
  70       }
  71
  72       for (i = strlen( qname) ; --i >= 0 ; ) {
  73         if (!isprint(qname[i])) qname[i] = '.';
  74       }
  75       DEBUG(1,("\t%-15s <%02x> - %s\n",qname,type,flags));
  76       p+=2;
  77     }
  78   DEBUG(1,("num_good_sends=%d num_good_receives=%d\n",
  79                IVAL(p,20),IVAL(p,24)));
  80 }
  81
  82
  83 /****************************************************************************
  84   do a netbios name status query on a host
  85
  86   the "master" parameter is a hack used for finding workgroups.
  87   **************************************************************************/
  88 BOOL name_status(int fd,char *name,int name_type,BOOL recurse,
  89                  struct in_addr to_ip,char *master,char *rname,
  90                  void (*fn)())
  91 {
  92   BOOL found=False;
  93   int retries = 2;
  94   int retry_time = 5000;
  95   struct timeval tval;
  96   struct packet_struct p;
  97   struct packet_struct *p2;
  98   struct nmb_packet *nmb = &p.packet.nmb;
  99   static int name_trn_id = 0;
 100
 101   bzero((char *)&p,sizeof(p));
 102
 103   if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) +
 104     (getpid()%(unsigned)100);
 105   name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
 106
 107   nmb->header.name_trn_id = name_trn_id;
 108   nmb->header.opcode = 0;
 109   nmb->header.response = False;
 110   nmb->header.nm_flags.bcast = False;
 111   nmb->header.nm_flags.recursion_available = False;
 112   nmb->header.nm_flags.recursion_desired = False;
 113   nmb->header.nm_flags.trunc = False;
 114   nmb->header.nm_flags.authoritative = False;
 115   nmb->header.rcode = 0;
 116   nmb->header.qdcount = 1;
 117   nmb->header.ancount = 0;
 118   nmb->header.nscount = 0;
 119   nmb->header.arcount = 0;
 120
 121   make_nmb_name(&nmb->question.question_name,name,name_type,scope);
 122
 123   nmb->question.question_type = 0x21;
 124   nmb->question.question_class = 0x1;
 125
 126   p.ip = to_ip;
 127   p.port = NMB_PORT;
 128   p.fd = fd;
 129   p.timestamp = time(NULL);
 130   p.packet_type = NMB_PACKET;
 131
 132   GetTimeOfDay(&tval);
 133
 134   if (!send_packet(&p))
 135     return(False);
 136
 137   retries--;
 138
 139   while (1)
 140     {
 141       struct timeval tval2;
 142       GetTimeOfDay(&tval2);
 143       if (TvalDiff(&tval,&tval2) > retry_time) {
 144         if (!retries) break;
 145         if (!found && !send_packet(&p))
 146           return False;
 147         GetTimeOfDay(&tval);
 148         retries--;
 149       }
 150
 151       if ((p2=receive_packet(fd,NMB_PACKET,90)))
 152         {
 153           struct nmb_packet *nmb2 = &p2->packet.nmb;
 154       debug_nmb_packet(p2);
 155
 156           if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
 157               !nmb2->header.response) {
 158             /* its not for us - maybe deal with it later */
 159             if (fn)
 160               fn(p2);
 161             else
 162               free_packet(p2);
 163             continue;
 164           }
 165
 166           if (nmb2->header.opcode != 0 ||
 167               nmb2->header.nm_flags.bcast ||
 168               nmb2->header.rcode ||
 169               !nmb2->header.ancount ||
 170               nmb2->answers->rr_type != 0x21) {
 171             /* XXXX what do we do with this? could be a redirect, but
 172                we'll discard it for the moment */
 173             free_packet(p2);
 174             continue;
 175           }
 176
 177           _interpret_node_status(&nmb2->answers->rdata[0], master,rname);
 178           free_packet(p2);
 179           return(True);
 180         }
 181     }
 182
 183
 184   DEBUG(0,("No status response (this is not unusual)\n"));
 185
 186   return(False);
 187 }
 188
 189
 190 /****************************************************************************
 191   do a netbios name query to find someones IP
 192   ****************************************************************************/
 193 BOOL name_query(int fd,char *name,int name_type,
 194                 BOOL bcast,BOOL recurse,
 195                 struct in_addr to_ip, struct in_addr *ip,void (*fn)())
 196 {
 197   BOOL found=False;
 198   int retries = 3;
 199   int retry_time = bcast?250:2000;
 200   struct timeval tval;
 201   struct packet_struct p;
 202   struct packet_struct *p2;
 203   struct nmb_packet *nmb = &p.packet.nmb;
 204   static int name_trn_id = 0;
 205
 206   bzero((char *)&p,sizeof(p));
 207
 208   if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) +
 209     (getpid()%(unsigned)100);
 210   name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
 211
 212   nmb->header.name_trn_id = name_trn_id;
 213   nmb->header.opcode = 0;
 214   nmb->header.response = False;
 215   nmb->header.nm_flags.bcast = bcast;
 216   nmb->header.nm_flags.recursion_available = False;
 217   nmb->header.nm_flags.recursion_desired = True;
 218   nmb->header.nm_flags.trunc = False;
 219   nmb->header.nm_flags.authoritative = False;
 220   nmb->header.rcode = 0;
 221   nmb->header.qdcount = 1;
 222   nmb->header.ancount = 0;
 223   nmb->header.nscount = 0;
 224   nmb->header.arcount = 0;
 225
 226   make_nmb_name(&nmb->question.question_name,name,name_type,scope);
 227
 228   nmb->question.question_type = 0x20;
 229   nmb->question.question_class = 0x1;
 230
 231   p.ip = to_ip;
 232   p.port = NMB_PORT;
 233   p.fd = fd;
 234   p.timestamp = time(NULL);
 235   p.packet_type = NMB_PACKET;
 236
 237   GetTimeOfDay(&tval);
 238
 239   if (!send_packet(&p))
 240     return(False);
 241
 242   retries--;
 243
 244   while (1)
 245     {
 246       struct timeval tval2;
 247       GetTimeOfDay(&tval2);
 248       if (TvalDiff(&tval,&tval2) > retry_time) {
 249         if (!retries) break;
 250         if (!found && !send_packet(&p))
 251           return False;
 252         GetTimeOfDay(&tval);
 253         retries--;
 254       }
 255
 256       if ((p2=receive_packet(fd,NMB_PACKET,90)))
 257         {
 258           struct nmb_packet *nmb2 = &p2->packet.nmb;
 259       debug_nmb_packet(p2);
 260
 261           if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
 262               !nmb2->header.response) {
 263             /* its not for us - maybe deal with it later
 264                (put it on the queue?) */
 265             if (fn)
 266               fn(p2);
 267             else
 268               free_packet(p2);
 269             continue;
 270           }
 271
 272           if (nmb2->header.opcode != 0 ||
 273               nmb2->header.nm_flags.bcast ||
 274               nmb2->header.rcode ||
 275               !nmb2->header.ancount) {
 276             /* XXXX what do we do with this? could be a redirect, but
 277                we'll discard it for the moment */
 278             free_packet(p2);
 279             continue;
 280           }
 281
 282           if (ip) {
 283             putip((char *)ip,&nmb2->answers->rdata[2]);
 284             DEBUG(fn?3:2,("Got a positive name query response from %s",
 285                           inet_ntoa(p2->ip)));
 286             DEBUG(fn?3:2,(" (%s)\n",inet_ntoa(*ip)));
 287           }
 288           found=True; retries=0;
 289           free_packet(p2);
 290           if (fn) break;
 291         }
 292     }
 293
 294   return(found);
 295 }