1/* 2 Unix SMB/CIFS implementation. 3 NBT netbios routines and daemon - version 2 4 Copyright (C) Andrew Tridgell 1994-1998 5 Copyright (C) Luke Kenneth Casson Leighton 1994-1998 6 Copyright (C) Jeremy Allison 1994-1998 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. 20 21*/ 22 23#include "includes.h" 24 25/**************************************************************************** 26 Deal with a response packet when releasing one of our names. 27****************************************************************************/ 28 29static void release_name_response(struct subnet_record *subrec, 30 struct response_record *rrec, struct packet_struct *p) 31{ 32 /* 33 * If we are releasing broadcast, then getting a response is an 34 * error. If we are releasing unicast, then we expect to get a response. 35 */ 36 struct nmb_packet *nmb = &p->packet.nmb; 37 bool bcast = nmb->header.nm_flags.bcast; 38 bool success = True; 39 struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name; 40 struct nmb_name *answer_name = &nmb->answers->rr_name; 41 struct in_addr released_ip; 42 43 /* Sanity check. Ensure that the answer name in the incoming packet is the 44 same as the requested name in the outgoing packet. */ 45 if (!nmb_name_equal(question_name, answer_name)) { 46 DEBUG(0,("release_name_response: Answer name %s differs from question name %s.\n", 47 nmb_namestr(answer_name), nmb_namestr(question_name))); 48 return; 49 } 50 51 if (bcast) { 52 /* Someone sent a response to a bcast release? ignore it. */ 53 return; 54 } 55 56 /* Unicast - check to see if the response allows us to release the name. */ 57 if (nmb->header.rcode != 0) { 58 /* Error code - we were told not to release the name ! What now ! */ 59 success = False; 60 61 DEBUG(0,("release_name_response: WINS server at IP %s rejected our \ 62name release of name %s with error code %d.\n", 63 inet_ntoa(p->ip), 64 nmb_namestr(answer_name), nmb->header.rcode)); 65 } else if (nmb->header.opcode == NMB_WACK_OPCODE) { 66 /* WINS server is telling us to wait. Pretend we didn't get 67 the response but don't send out any more release requests. */ 68 69 DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \ 70name %s on subnet %s.\n", 71 inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name)); 72 73 rrec->repeat_count = 0; 74 /* How long we should wait for. */ 75 rrec->repeat_time = p->timestamp + nmb->answers->ttl; 76 rrec->num_msgs--; 77 return; 78 } 79 80 DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n", 81 success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name)); 82 if (success) { 83 putip((char*)&released_ip ,&nmb->answers->rdata[2]); 84 85 if(rrec->success_fn) 86 (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip); 87 standard_success_release( subrec, rrec->userdata, answer_name, released_ip); 88 } else { 89 /* We have no standard_fail_release - maybe we should add one ? */ 90 if (rrec->fail_fn) { 91 (*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name); 92 } 93 } 94 95 remove_response_record(subrec, rrec); 96} 97 98/**************************************************************************** 99 Deal with a timeout when releasing one of our names. 100****************************************************************************/ 101 102static void release_name_timeout_response(struct subnet_record *subrec, 103 struct response_record *rrec) 104{ 105 /* a release is *always* considered to be successful when it 106 times out. This doesn't cause problems as if a WINS server 107 doesn't respond and someone else wants the name then the 108 normal WACK/name query from the WINS server will cope */ 109 struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb; 110 bool bcast = sent_nmb->header.nm_flags.bcast; 111 struct nmb_name *question_name = &sent_nmb->question.question_name; 112 struct in_addr released_ip; 113 114 /* Get the ip address we were trying to release. */ 115 putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]); 116 117 if (!bcast) { 118 /* mark the WINS server temporarily dead */ 119 wins_srv_died(rrec->packet->ip, released_ip); 120 } 121 122 DEBUG(5,("release_name_timeout_response: success in releasing name %s on subnet %s.\n", 123 nmb_namestr(question_name), subrec->subnet_name)); 124 125 if (rrec->success_fn) { 126 (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip); 127 } 128 129 standard_success_release( subrec, rrec->userdata, question_name, released_ip); 130 remove_response_record(subrec, rrec); 131} 132 133 134/* 135 when releasing a name with WINS we need to send the release to each of 136 the WINS groups 137*/ 138static void wins_release_name(struct name_record *namerec, 139 release_name_success_function success_fn, 140 release_name_fail_function fail_fn, 141 struct userdata_struct *userdata) 142{ 143 int t, i; 144 char **wins_tags; 145 146 /* get the list of wins tags - we try to release for each of them */ 147 wins_tags = wins_srv_tags(); 148 149 for (t=0;wins_tags && wins_tags[t]; t++) { 150 for (i = 0; i < namerec->data.num_ips; i++) { 151 struct in_addr wins_ip = wins_srv_ip_tag(wins_tags[t], namerec->data.ip[i]); 152 153 bool last_one = ((i==namerec->data.num_ips - 1) && !wins_tags[t+1]); 154 if (queue_release_name(unicast_subnet, 155 release_name_response, 156 release_name_timeout_response, 157 last_one?success_fn : NULL, 158 last_one? fail_fn : NULL, 159 last_one? userdata : NULL, 160 &namerec->name, 161 namerec->data.nb_flags, 162 namerec->data.ip[i], 163 wins_ip) == NULL) { 164 DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n", 165 nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) )); 166 } 167 } 168 } 169 170 wins_srv_tags_free(wins_tags); 171} 172 173 174/**************************************************************************** 175 Try and release one of our names. 176****************************************************************************/ 177 178void release_name(struct subnet_record *subrec, struct name_record *namerec, 179 release_name_success_function success_fn, 180 release_name_fail_function fail_fn, 181 struct userdata_struct *userdata) 182{ 183 int i; 184 185 /* Ensure it's a SELF name, and in the ACTIVE state. */ 186 if ((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) { 187 DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n", 188 nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source)); 189 return; 190 } 191 192 /* Set the name into the deregistering state. */ 193 namerec->data.nb_flags |= NB_DEREG; 194 195 /* wins releases are a bit different */ 196 if (subrec == unicast_subnet) { 197 wins_release_name(namerec, success_fn, fail_fn, userdata); 198 return; 199 } 200 201 /* 202 * Go through and release the name for all known ip addresses. 203 * Only call the success/fail function on the last one (it should 204 * only be done once). 205 */ 206 for (i = 0; i < namerec->data.num_ips; i++) { 207 if (queue_release_name(subrec, 208 release_name_response, 209 release_name_timeout_response, 210 (i == (namerec->data.num_ips - 1)) ? success_fn : NULL, 211 (i == (namerec->data.num_ips - 1)) ? fail_fn : NULL, 212 (i == (namerec->data.num_ips - 1)) ? userdata : NULL, 213 &namerec->name, 214 namerec->data.nb_flags, 215 namerec->data.ip[i], 216 subrec->bcast_ip) == NULL) { 217 DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n", 218 nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) )); 219 } 220 } 221} 222