diff options
Diffstat (limited to 'source3/nmbd/nmbd_namerelease.c')
| -rw-r--r-- | source3/nmbd/nmbd_namerelease.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_namerelease.c b/source3/nmbd/nmbd_namerelease.c new file mode 100644 index 0000000000..fd35181f33 --- /dev/null +++ b/source3/nmbd/nmbd_namerelease.c @@ -0,0 +1,233 @@ +/* + Unix SMB/CIFS implementation. + NBT netbios routines and daemon - version 2 + Copyright (C) Andrew Tridgell 1994-1998 + Copyright (C) Luke Kenneth Casson Leighton 1994-1998 + Copyright (C) Jeremy Allison 1994-1998 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include "includes.h" + +/**************************************************************************** + Deal with a response packet when releasing one of our names. +****************************************************************************/ + +static void release_name_response(struct subnet_record *subrec, + struct response_record *rrec, struct packet_struct *p) +{ + /* + * If we are releasing broadcast, then getting a response is an + * error. If we are releasing unicast, then we expect to get a response. + */ + + struct nmb_packet *nmb = &p->packet.nmb; + BOOL bcast = nmb->header.nm_flags.bcast; + BOOL success = True; + struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name; + struct nmb_name *answer_name = &nmb->answers->rr_name; + struct in_addr released_ip; + + /* Sanity check. Ensure that the answer name in the incoming packet is the + same as the requested name in the outgoing packet. */ + + if(!nmb_name_equal(question_name, answer_name)) + { + DEBUG(0,("release_name_response: Answer name %s differs from question \ +name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name))); + return; + } + + if(bcast) + { + /* Someone sent a response. This shouldn't happen/ */ + DEBUG(1,("release_name_response: A response for releasing name %s was received on a \ +broadcast subnet %s. This should not happen !\n", nmb_namestr(answer_name), subrec->subnet_name)); + return; + } + else + { + /* Unicast - check to see if the response allows us to release the name. */ + if(nmb->header.rcode != 0) + { + /* Error code - we were told not to release the name ! What now ! */ + success = False; + + DEBUG(0,("release_name_response: WINS server at IP %s rejected our \ +name release of name %s with error code %d.\n", inet_ntoa(p->ip), + nmb_namestr(answer_name), nmb->header.rcode)); + + } + else if(nmb->header.opcode == NMB_WACK_OPCODE) + { + /* WINS server is telling us to wait. Pretend we didn't get + the response but don't send out any more release requests. */ + + DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \ +name %s on subnet %s.\n", inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name)); + + rrec->repeat_count = 0; + /* How long we should wait for. */ + rrec->repeat_time = p->timestamp + nmb->answers->ttl; + rrec->num_msgs--; + return; + } + } + + DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n", + success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name)); + + if(success) + { + putip((char*)&released_ip ,&nmb->answers->rdata[2]); + + if(rrec->success_fn) + (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip); + standard_success_release( subrec, rrec->userdata, answer_name, released_ip); + } + else + { + /* We have no standard_fail_release - maybe we should add one ? */ + if(rrec->fail_fn) + (*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name); + } + + remove_response_record(subrec, rrec); +} + +/**************************************************************************** + Deal with a timeout when releasing one of our names. +****************************************************************************/ + +static void release_name_timeout_response(struct subnet_record *subrec, + struct response_record *rrec) +{ + /* + * If we are releasing unicast, then NOT getting a response is an + * error - we could not release the name. If we are releasing broadcast, + * then we don't expect to get a response. + */ + + struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb; + BOOL bcast = sent_nmb->header.nm_flags.bcast; + BOOL success = False; + struct nmb_name *question_name = &sent_nmb->question.question_name; + struct in_addr released_ip; + + if(bcast) + { + if(rrec->num_msgs == 0) + { + /* Not receiving a message is success for broadcast release. */ + success = True; + + /* Get the ip address we were trying to release. */ + putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]); + } + } + else + { + /* Unicast - if no responses then it's an error. */ + if(rrec->num_msgs == 0) + { + DEBUG(2,("release_name_timeout_response: WINS server at address %s is not \ +responding.\n", inet_ntoa(rrec->packet->ip))); + + /* Keep trying to contact the WINS server periodically. This allows + us to work correctly if the WINS server is down temporarily when + we want to delete the name. */ + + /* Reset the number of attempts to zero and double the interval between + retries. Max out at 5 minutes. */ + rrec->repeat_count = 3; + rrec->repeat_interval *= 2; + if(rrec->repeat_interval > (5 * 60)) + rrec->repeat_interval = (5 * 60); + rrec->repeat_time = time(NULL) + rrec->repeat_interval; + + DEBUG(5,("release_name_timeout_response: increasing WINS timeout to %d seconds.\n", + (int)rrec->repeat_interval)); + return; /* Don't remove the response record. */ + } + } + + DEBUG(5,("release_name_timeout_response: %s in releasing name %s on subnet %s.\n", + success ? "success" : "failure", nmb_namestr(question_name), subrec->subnet_name)); + + if(success && rrec->success_fn) + { + if(rrec->success_fn) + (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip); + standard_success_release( subrec, rrec->userdata, question_name, released_ip); + } + else + { + /* We have no standard_fail_release - maybe we should add one ? */ + if( rrec->fail_fn) + (*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name); + } + + remove_response_record(subrec, rrec); +} + +/**************************************************************************** + Try and release one of our names. +****************************************************************************/ + +BOOL release_name(struct subnet_record *subrec, struct name_record *namerec, + release_name_success_function success_fn, + release_name_fail_function fail_fn, + struct userdata_struct *userdata) +{ + int i; + + /* Ensure it's a SELF name, and in the ACTIVE state. */ + if((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) + { + DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n", + nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source)); + return True; + } + + /* Set the name into the deregistering state. */ + namerec->data.nb_flags |= NB_DEREG; + + /* + * Go through and release the name for all known ip addresses. + * Only call the success/fail function on the last one (it should + * only be done once). + */ + + for( i = 0; i < namerec->data.num_ips; i++) + { + if(queue_release_name( subrec, + release_name_response, + release_name_timeout_response, + (i == (namerec->data.num_ips - 1)) ? success_fn : NULL, + (i == (namerec->data.num_ips - 1)) ? fail_fn : NULL, + (i == (namerec->data.num_ips - 1)) ? userdata : NULL, + &namerec->name, + namerec->data.nb_flags, + namerec->data.ip[i]) == NULL) + { + DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n", + nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) )); + return True; + } + } + return False; +} |