/* Unix SMB/CIFS implementation. NBT netbios routines and daemon - version 2 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "nmbd/nmbd.h" /**************************************************************************** Function called when the name lookup succeeded. ****************************************************************************/ static void wins_proxy_name_query_request_success( struct subnet_record *subrec, struct userdata_struct *userdata, struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec) { unstring name; struct packet_struct *original_packet; struct subnet_record *orig_broadcast_subnet; struct name_record *namerec = NULL; uint16 nb_flags; int num_ips; int i; int ttl = 3600; /* By default one hour in the cache. */ struct in_addr *iplist; /* Extract the original packet and the original broadcast subnet from the userdata. */ memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) ); memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) ); if (rrec) { nb_flags = get_nb_flags( rrec->rdata ); num_ips = rrec->rdlength / 6; } else { nb_flags = 0; num_ips = 0; } if(num_ips == 0) { DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \ returned for name %s.\n", nmb_namestr(nmbname) )); return; } if(num_ips == 1) { iplist = &ip; } else { if((iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == NULL) { DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n")); return; } for(i = 0; i < num_ips; i++) { putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]); } } /* Add the queried name to the original subnet as a WINS_PROXY_NAME. */ if(rrec->ttl == PERMANENT_TTL) { ttl = lp_max_ttl(); } pull_ascii_nstring(name, sizeof(name), nmbname->name); add_name_to_subnet( orig_broadcast_subnet, name, nmbname->name_type, nb_flags, ttl, WINS_PROXY_NAME, num_ips, iplist ); if(iplist != &ip) { SAFE_FREE(iplist); } namerec = find_name_on_subnet(orig_broadcast_subnet, nmbname, FIND_ANY_NAME); if (!namerec) { DEBUG(0,("wins_proxy_name_query_request_success: failed to add " "name %s to subnet %s !\n", name, orig_broadcast_subnet->subnet_name )); return; } /* * Check that none of the IP addresses we are returning is on the * same broadcast subnet as the original requesting packet. If it * is then don't reply (although we still need to add the name * to the cache) as the actual machine will be replying also * and we don't want two replies to a broadcast query. */ if(namerec && original_packet->packet.nmb.header.nm_flags.bcast) { for( i = 0; i < namerec->data.num_ips; i++) { if( same_net_v4( namerec->data.ip[i], orig_broadcast_subnet->myip, orig_broadcast_subnet->mask_ip ) ) { DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \ proxy name and is also on the same subnet (%s) as the requestor. \ Not replying.\n", nmb_namestr(&namerec->name), orig_broadcast_subnet->subnet_name ) ); return; } } } /* Finally reply to the original name query. */ reply_netbios_packet(original_packet, /* Packet to reply to. */ 0, /* Result code. */ NMB_QUERY, /* nmbd type code. */ NMB_NAME_QUERY_OPCODE, /* opcode. */ ttl, /* ttl. */ rrec->rdata, /* data to send. */ rrec->rdlength); /* data length. */ } /**************************************************************************** Function called when the name lookup failed. ****************************************************************************/ static void wins_proxy_name_query_request_fail(struct subnet_record *subrec, struct response_record *rrec, struct nmb_name *question_name, int fail_code) { DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \ of name %s.\n", fail_code, nmb_namestr(question_name) )); } /**************************************************************************** Function to make a deep copy of the userdata we will need when the WINS proxy query returns. ****************************************************************************/ static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata) { struct packet_struct *p, *copy_of_p; struct userdata_struct *new_userdata = (struct userdata_struct *)SMB_MALLOC( userdata->userdata_len ); if(new_userdata == NULL) return NULL; new_userdata->copy_fn = userdata->copy_fn; new_userdata->free_fn = userdata->free_fn; new_userdata->userdata_len = userdata->userdata_len; /* Copy the subnet_record pointer. */ memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) ); /* Extract the pointer to the packet struct */ memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) ); /* Do a deep copy of the packet. */ if((copy_of_p = copy_packet(p)) == NULL) { SAFE_FREE(new_userdata); return NULL; } /* Lock the copy. */ copy_of_p->locked = True; memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p, sizeof(struct packet_struct *) ); return new_userdata; } /**************************************************************************** Function to free the deep copy of the userdata we used when the WINS proxy query returned. ****************************************************************************/ static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata) { struct packet_struct *p; /* Extract the pointer to the packet struct */ memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *)); /* Unlock the packet. */ p->locked = False; free_packet(p); ZERO_STRUCTP(userdata); SAFE_FREE(userdata); } /**************************************************************************** Make a WINS query on behalf of a broadcast client name query request. ****************************************************************************/ void make_wins_proxy_name_query_request( struct subnet_record *subrec, struct packet_struct *incoming_packet, struct nmb_name *question_name) { union { struct userdata_struct ud; char c[sizeof(struct userdata_struct) + sizeof(struct subrec *) + sizeof(struct packet_struct *)+sizeof(long*)]; } ud; struct userdata_struct *userdata = &ud.ud; unstring qname; memset(&ud, '\0', sizeof(ud)); userdata->copy_fn = wins_proxy_userdata_copy_fn; userdata->free_fn = wins_proxy_userdata_free_fn; userdata->userdata_len = sizeof(ud); memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *)); memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet, sizeof(struct packet_struct *)); /* Now use the unicast subnet to query the name with the WINS server. */ pull_ascii_nstring(qname, sizeof(qname), question_name->name); query_name( unicast_subnet, qname, question_name->name_type, wins_proxy_name_query_request_success, wins_proxy_name_query_request_fail, userdata); }