source/libsmb/namequery.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    name query routines
   5    Copyright (C) Andrew Tridgell 1994-1995
   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 level = (master||rname)?4:0;
  35   int numnames = CVAL(p,0);
  36   DEBUG(level,("received %d names\n",numnames));
  37
  38   if (rname) *rname = 0;
  39   if (master) *master = 0;
  40
  41   p += 1;
  42   while (numnames--)
  43     {
  44       char qname[17];
  45       int type;
  46       fstring flags;
  47       int i;
  48       *flags = 0;
  49       StrnCpy(qname,p,15);
  50       type = CVAL(p,15);
  51       p += 16;
  52
  53       strcat(flags, (p[0] & 0x80) ? "<GROUP> " : "        ");
  54       if ((p[0] & 0x60) == 0x00) strcat(flags,"B ");
  55       if ((p[0] & 0x60) == 0x20) strcat(flags,"P ");
  56       if ((p[0] & 0x60) == 0x40) strcat(flags,"M ");
  57       if ((p[0] & 0x60) == 0x60) strcat(flags,"_ ");
  58       if (p[0] & 0x10) strcat(flags,"<DEREGISTERING> ");
  59       if (p[0] & 0x08) strcat(flags,"<CONFLICT> ");
  60       if (p[0] & 0x04) strcat(flags,"<ACTIVE> ");
  61       if (p[0] & 0x02) strcat(flags,"<PERMANENT> ");
  62
  63       if (master && !*master && type == 0x1d) {
  64         StrnCpy(master,qname,15);
  65         trim_string(master,NULL," ");
  66       }
  67
  68       if (rname && !*rname && type == 0x20 && !(p[0]&0x80)) {
  69         StrnCpy(rname,qname,15);
  70         trim_string(rname,NULL," ");
  71       }
  72
  73       for (i = strlen( qname) ; --i >= 0 ; ) {
  74         if (!isprint(qname[i])) qname[i] = '.';
  75       }
  76       DEBUG(level,("\t%-15s <%02x> - %s\n",qname,type,flags));
  77       p+=2;
  78     }
  79   DEBUG(level,("num_good_sends=%d num_good_receives=%d\n",
  80                IVAL(p,20),IVAL(p,24)));
  81 }
  82
  83
  84 /****************************************************************************
  85   do a netbios name status query on a host
  86
  87   the "master" parameter is a hack used for finding workgroups.
  88   **************************************************************************/
  89 BOOL name_status(int fd,char *name,int name_type,BOOL recurse,
  90                  struct in_addr to_ip,char *master,char *rname,
  91                  void (*fn)())
  92 {
  93   BOOL found=False;
  94   int retries = 2;
  95   int retry_time = 5000;
  96   struct timeval tval;
  97   struct packet_struct p;
  98   struct packet_struct *p2;
  99   struct nmb_packet *nmb = &p.packet.nmb;
 100   static int name_trn_id = 0;
 101
 102   bzero((char *)&p,sizeof(p));
 103
 104   if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) +
 105     (getpid()%(unsigned)100);
 106   name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
 107
 108   nmb->header.name_trn_id = name_trn_id;
 109   nmb->header.opcode = 0;
 110   nmb->header.response = False;
 111   nmb->header.nm_flags.bcast = False;
 112   nmb->header.nm_flags.recursion_available = 0;
 113   nmb->header.nm_flags.recursion_desired = 1;
 114   nmb->header.nm_flags.trunc = False;
 115   nmb->header.nm_flags.authoritative = False;
 116   nmb->header.rcode = 0;
 117   nmb->header.qdcount = 1;
 118   nmb->header.ancount = 0;
 119   nmb->header.nscount = 0;
 120   nmb->header.arcount = 0;
 121
 122   make_nmb_name(&nmb->question.question_name,name,name_type,scope);
 123
 124   nmb->question.question_type = 0x21;
 125   nmb->question.question_class = 0x1;
 126
 127   p.ip = to_ip;
 128   p.port = NMB_PORT;
 129   p.fd = fd;
 130   p.timestamp = time(NULL);
 131   p.packet_type = NMB_PACKET;
 132
 133   GetTimeOfDay(&tval);
 134
 135   if (!send_packet(&p))
 136     return(False);
 137
 138   retries--;
 139
 140   while (1)
 141     {
 142       struct timeval tval2;
 143       GetTimeOfDay(&tval2);
 144       if (TvalDiff(&tval,&tval2) > retry_time) {
 145         if (!retries) break;
 146         if (!found && !send_packet(&p))
 147           return False;
 148         GetTimeOfDay(&tval);
 149         retries--;
 150       }
 151
 152       if ((p2=receive_packet(fd,NMB_PACKET,90)))
 153         {
 154           struct nmb_packet *nmb2 = &p2->packet.nmb;
 155           if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
 156               !nmb2->header.response) {
 157             /* its not for us - maybe deal with it later */
 158             if (fn)
 159               fn(p2);
 160             else
 161               free_packet(p2);
 162             continue;
 163           }
 164
 165           if (nmb2->header.opcode != 0 ||
 166               nmb2->header.nm_flags.bcast ||
 167               nmb2->header.rcode ||
 168               !nmb2->header.ancount ||
 169               nmb2->answers->rr_type != 0x21) {
 170             /* XXXX what do we do with this? could be a redirect, but
 171                we'll discard it for the moment */
 172             free_packet(p2);
 173             continue;
 174           }
 175
 176           _interpret_node_status(&nmb2->answers->rdata[0], master,rname);
 177           free_packet(p2);
 178           return(True);
 179         }
 180     }
 181
 182
 183   DEBUG(0,("No status response (this is not unusual)\n"));
 184
 185   return(False);
 186 }
 187
 188
 189 /****************************************************************************
 190   do a netbios name query to find someones IP
 191   ****************************************************************************/
 192 BOOL name_query(int fd,char *name,int name_type,
 193                 BOOL bcast,BOOL recurse,
 194                 struct in_addr to_ip, struct in_addr *ip,void (*fn)())
 195 {
 196   BOOL found=False;
 197   int retries = 3;
 198   int retry_time = bcast?250:2000;
 199   struct timeval tval;
 200   struct packet_struct p;
 201   struct packet_struct *p2;
 202   struct nmb_packet *nmb = &p.packet.nmb;
 203   static int name_trn_id = 0;
 204
 205   bzero((char *)&p,sizeof(p));
 206
 207   if (!name_trn_id) name_trn_id = (time(NULL)%(unsigned)0x7FFF) +
 208     (getpid()%(unsigned)100);
 209   name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
 210
 211   nmb->header.name_trn_id = name_trn_id;
 212   nmb->header.opcode = 0;
 213   nmb->header.response = False;
 214   nmb->header.nm_flags.bcast = bcast;
 215   nmb->header.nm_flags.recursion_available = 0;
 216   nmb->header.nm_flags.recursion_desired = 1;
 217   nmb->header.nm_flags.trunc = False;
 218   nmb->header.nm_flags.authoritative = False;
 219   nmb->header.rcode = 0;
 220   nmb->header.qdcount = 1;
 221   nmb->header.ancount = 0;
 222   nmb->header.nscount = 0;
 223   nmb->header.arcount = 0;
 224
 225   make_nmb_name(&nmb->question.question_name,name,name_type,scope);
 226
 227   nmb->question.question_type = 0x20;
 228   nmb->question.question_class = 0x1;
 229
 230   p.ip = to_ip;
 231   p.port = NMB_PORT;
 232   p.fd = fd;
 233   p.timestamp = time(NULL);
 234   p.packet_type = NMB_PACKET;
 235
 236   GetTimeOfDay(&tval);
 237
 238   if (!send_packet(&p))
 239     return(False);
 240
 241   retries--;
 242
 243   while (1)
 244     {
 245       struct timeval tval2;
 246       GetTimeOfDay(&tval2);
 247       if (TvalDiff(&tval,&tval2) > retry_time) {
 248         if (!retries) break;
 249         if (!found && !send_packet(&p))
 250           return False;
 251         GetTimeOfDay(&tval);
 252         retries--;
 253       }
 254
 255       if ((p2=receive_packet(fd,NMB_PACKET,90)))
 256         {
 257           struct nmb_packet *nmb2 = &p2->packet.nmb;
 258           if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
 259               !nmb2->header.response) {
 260             /* its not for us - maybe deal with it later
 261                (put it on the queue?) */
 262             if (fn)
 263               fn(p2);
 264             else
 265               free_packet(p2);
 266             continue;
 267           }
 268
 269           if (nmb2->header.opcode != 0 ||
 270               nmb2->header.nm_flags.bcast ||
 271               nmb2->header.rcode ||
 272               !nmb2->header.ancount) {
 273             /* XXXX what do we do with this? could be a redirect, but
 274                we'll discard it for the moment */
 275             free_packet(p2);
 276             continue;
 277           }
 278
 279           if (ip) {
 280             putip((char *)ip,&nmb2->answers->rdata[2]);
 281             DEBUG(fn?3:2,("Got a positive name query response from %s",
 282                           inet_ntoa(p2->ip)));
 283             DEBUG(fn?3:2,(" (%s)\n",inet_ntoa(*ip)));
 284           }
 285           found=True; retries=0;
 286           free_packet(p2);
 287           if (fn) break;
 288         }
 289     }
 290
 291   return(found);
 292 }