1/* 2 Unix SMB/CIFS implementation. 3 NBT netbios routines and daemon - version 2 4 5 Copyright (C) Jeremy Allison 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 23#include "includes.h" 24 25/**************************************************************************** 26Function called when the name lookup succeeded. 27****************************************************************************/ 28 29static void wins_proxy_name_query_request_success( struct subnet_record *subrec, 30 struct userdata_struct *userdata, 31 struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec) 32{ 33 unstring name; 34 struct packet_struct *original_packet; 35 struct subnet_record *orig_broadcast_subnet; 36 struct name_record *namerec; 37 uint16 nb_flags; 38 int num_ips; 39 int i; 40 int ttl = 3600; /* By default one hour in the cache. */ 41 struct in_addr *iplist; 42 43 /* Extract the original packet and the original broadcast subnet from 44 the userdata. */ 45 46 memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) ); 47 memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)], 48 sizeof(struct packet_struct *) ); 49 50 nb_flags = get_nb_flags( rrec->rdata ); 51 52 num_ips = rrec->rdlength / 6; 53 if(num_ips == 0) { 54 DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \ 55returned for name %s.\n", nmb_namestr(nmbname) )); 56 return; 57 } 58 59 if(num_ips == 1) { 60 iplist = &ip; 61 } else { 62 if((iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == NULL) { 63 DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n")); 64 return; 65 } 66 67 for(i = 0; i < num_ips; i++) 68 putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]); 69 } 70 71 /* Add the queried name to the original subnet as a WINS_PROXY_NAME. */ 72 73 if(rrec == PERMANENT_TTL) 74 ttl = lp_max_ttl(); 75 76 pull_ascii_nstring(name, sizeof(name), nmbname->name); 77 namerec = add_name_to_subnet( orig_broadcast_subnet, name, 78 nmbname->name_type, nb_flags, ttl, 79 WINS_PROXY_NAME, num_ips, iplist ); 80 81 if(iplist != &ip) 82 SAFE_FREE(iplist); 83 84 /* 85 * Check that none of the IP addresses we are returning is on the 86 * same broadcast subnet as the original requesting packet. If it 87 * is then don't reply (although we still need to add the name 88 * to the cache) as the actual machine will be replying also 89 * and we don't want two replies to a broadcast query. 90 */ 91 92 if(namerec && original_packet->packet.nmb.header.nm_flags.bcast) { 93 for( i = 0; i < namerec->data.num_ips; i++) { 94 if( same_net( namerec->data.ip[i], orig_broadcast_subnet->myip, 95 orig_broadcast_subnet->mask_ip ) ) { 96 DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \ 97proxy name and is also on the same subnet (%s) as the requestor. \ 98Not replying.\n", nmb_namestr(&namerec->name), orig_broadcast_subnet->subnet_name ) ); 99 return; 100 } 101 } 102 } 103 104 /* Finally reply to the original name query. */ 105 reply_netbios_packet(original_packet, /* Packet to reply to. */ 106 0, /* Result code. */ 107 NMB_QUERY, /* nmbd type code. */ 108 NMB_NAME_QUERY_OPCODE, /* opcode. */ 109 ttl, /* ttl. */ 110 rrec->rdata, /* data to send. */ 111 rrec->rdlength); /* data length. */ 112} 113 114/**************************************************************************** 115Function called when the name lookup failed. 116****************************************************************************/ 117 118static void wins_proxy_name_query_request_fail(struct subnet_record *subrec, 119 struct response_record *rrec, 120 struct nmb_name *question_name, int fail_code) 121{ 122 DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \ 123of name %s.\n", fail_code, nmb_namestr(question_name) )); 124} 125 126/**************************************************************************** 127Function to make a deep copy of the userdata we will need when the WINS 128proxy query returns. 129****************************************************************************/ 130 131static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata) 132{ 133 struct packet_struct *p, *copy_of_p; 134 struct userdata_struct *new_userdata = (struct userdata_struct *)SMB_MALLOC( userdata->userdata_len ); 135 136 if(new_userdata == NULL) 137 return NULL; 138 139 new_userdata->copy_fn = userdata->copy_fn; 140 new_userdata->free_fn = userdata->free_fn; 141 new_userdata->userdata_len = userdata->userdata_len; 142 143 /* Copy the subnet_record pointer. */ 144 memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) ); 145 146 /* Extract the pointer to the packet struct */ 147 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) ); 148 149 /* Do a deep copy of the packet. */ 150 if((copy_of_p = copy_packet(p)) == NULL) { 151 SAFE_FREE(new_userdata); 152 return NULL; 153 } 154 155 /* Lock the copy. */ 156 copy_of_p->locked = True; 157 158 memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p, 159 sizeof(struct packet_struct *) ); 160 161 return new_userdata; 162} 163 164/**************************************************************************** 165Function to free the deep copy of the userdata we used when the WINS 166proxy query returned. 167****************************************************************************/ 168 169static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata) 170{ 171 struct packet_struct *p; 172 173 /* Extract the pointer to the packet struct */ 174 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], 175 sizeof(struct packet_struct *)); 176 177 /* Unlock the packet. */ 178 p->locked = False; 179 180 free_packet(p); 181 ZERO_STRUCTP(userdata); 182 SAFE_FREE(userdata); 183} 184 185/**************************************************************************** 186 Make a WINS query on behalf of a broadcast client name query request. 187****************************************************************************/ 188 189void make_wins_proxy_name_query_request( struct subnet_record *subrec, 190 struct packet_struct *incoming_packet, 191 struct nmb_name *question_name) 192{ 193 union { 194 struct userdata_struct ud; 195 char c[sizeof(struct userdata_struct) + sizeof(struct subrec *) + 196 sizeof(struct packet_struct *)+sizeof(long*)]; 197 } ud; 198 struct userdata_struct *userdata = &ud.ud; 199 unstring qname; 200 201 memset(&ud, '\0', sizeof(ud)); 202 203 userdata->copy_fn = wins_proxy_userdata_copy_fn; 204 userdata->free_fn = wins_proxy_userdata_free_fn; 205 userdata->userdata_len = sizeof(ud); 206 memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *)); 207 memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet, 208 sizeof(struct packet_struct *)); 209 210 /* Now use the unicast subnet to query the name with the WINS server. */ 211 pull_ascii_nstring(qname, sizeof(qname), question_name->name); 212 query_name( unicast_subnet, qname, question_name->name_type, 213 wins_proxy_name_query_request_success, 214 wins_proxy_name_query_request_fail, 215 userdata); 216} 217