diff options
Diffstat (limited to 'source3/nmbd/nmbd_incomingrequests.c')
| -rw-r--r-- | source3/nmbd/nmbd_incomingrequests.c | 316 |
1 files changed, 146 insertions, 170 deletions
diff --git a/source3/nmbd/nmbd_incomingrequests.c b/source3/nmbd/nmbd_incomingrequests.c index 3f2b921074..834f237a2c 100644 --- a/source3/nmbd/nmbd_incomingrequests.c +++ b/source3/nmbd/nmbd_incomingrequests.c @@ -449,175 +449,151 @@ For broadcast name queries: void process_name_query_request(struct subnet_record *subrec, struct packet_struct *p) { - struct nmb_packet *nmb = &p->packet.nmb; - struct nmb_name *question = &nmb->question.question_name; - int name_type = question->name_type; - BOOL bcast = nmb->header.nm_flags.bcast; - int ttl=0; - int rcode = 0; - char *prdata = NULL; - char rdata[6]; - BOOL success = False; - struct name_record *namerec = NULL; - int reply_data_len = 0; - int i; - - DEBUG(3,("process_name_query_request: Name query from %s on subnet %s for name %s\n", - inet_ntoa(p->ip), subrec->subnet_name, nmb_namestr(question))); + struct nmb_packet *nmb = &p->packet.nmb; + struct nmb_name *question = &nmb->question.question_name; + int name_type = question->name_type; + BOOL bcast = nmb->header.nm_flags.bcast; + int ttl=0; + int rcode = 0; + char *prdata = NULL; + char rdata[6]; + BOOL success = False; + struct name_record *namerec = NULL; + int reply_data_len = 0; + int i; + + DEBUG(3,("process_name_query_request: Name query from %s on subnet %s for name %s\n", + inet_ntoa(p->ip), subrec->subnet_name, nmb_namestr(question))); - /* Look up the name in the cache - if the request is a broadcast request that - came from a subnet we don't know about then search all the broadcast subnets - for a match (as we don't know what interface the request came in on). */ - - if(subrec == remote_broadcast_subnet) - namerec = find_name_for_remote_broadcast_subnet( question, FIND_ANY_NAME); - else - namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME); - - - /* Check if it is a name that expired */ - if( namerec - && ( (namerec->data.death_time != PERMANENT_TTL) - && (namerec->data.death_time < p->timestamp) ) ) - { - DEBUG(5,("process_name_query_request: expired name %s\n", nmb_namestr(&namerec->name))); - namerec = NULL; - } - - if (namerec) - { - - /* - * Always respond to unicast queries. - * Don't respond to broadcast queries unless the query is for - * a name we own, a Primary Domain Controller name, or a WINS_PROXY - * name with type 0 or 0x20. WINS_PROXY names are only ever added - * into the namelist if we were configured as a WINS proxy. - */ - - if( !bcast - || ( bcast - && ( (name_type == 0x1b) - || (namerec->data.source == SELF_NAME) - || (namerec->data.source == PERMANENT_NAME) - || ( (namerec->data.source == WINS_PROXY_NAME) - && ( (name_type == 0) || (name_type == 0x20) ) - ) - ) - ) - ) - { - - /* The requested name is a directed query, or it's SELF or PERMANENT or WINS_PROXY, - or it's a Domain Master type. */ - - /* - * If this is a WINS_PROXY_NAME, then ceck that none of the IP - * addresses we are returning is on the same broadcast subnet - * as the requesting packet. If it is then don't reply as the - * actual machine will be replying also and we don't want two - * replies to a broadcast query. - */ - - if( namerec->data.source == WINS_PROXY_NAME ) - { - for( i = 0; i < namerec->data.num_ips; i++) - { - if(same_net( namerec->data.ip[i], subrec->myip, subrec->mask_ip )) - { - DEBUG(5,("process_name_query_request: 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), subrec->subnet_name )); - return; - } - } - } - - ttl = (namerec->data.death_time != PERMANENT_TTL) ? - namerec->data.death_time - p->timestamp : lp_max_ttl(); - - /* Copy all known ip addresses into the return data. */ - /* Optimise for the common case of one IP address so - we don't need a malloc. */ - - if( namerec->data.num_ips == 1 ) - prdata = rdata; - else - { - if((prdata = (char *)malloc( namerec->data.num_ips * 6 )) == NULL) - { - DEBUG(0,("process_name_query_request: malloc fail !\n")); - return; - } - } - - for( i = 0; i < namerec->data.num_ips; i++ ) - { - set_nb_flags(&prdata[i*6],namerec->data.nb_flags); - putip((char *)&prdata[2+(i*6)], &namerec->data.ip[i]); - } - - sort_query_replies(prdata, i, p->ip); - - reply_data_len = namerec->data.num_ips * 6; - success = True; - } - } - - /* - * If a machine is broadcasting a name lookup request and we have lp_wins_proxy() - * set we should initiate a WINS query here. On success we add the resolved name - * into our namelist with a type of WINS_PROXY_NAME and then reply to the query. - */ - - if(!success && (namerec == NULL) && we_are_a_wins_client() && lp_wins_proxy() && - bcast && (subrec != remote_broadcast_subnet)) - { - make_wins_proxy_name_query_request( subrec, p, question ); - return; - } - - if (!success && bcast) - { - if(prdata != rdata) - SAFE_FREE(prdata); - return; /* Never reply with a negative response to broadcasts. */ - } - - /* - * Final check. From observation, if a unicast packet is sent - * to a non-WINS server with the recursion desired bit set - * then never send a negative response. - */ - - if(!success && !bcast && nmb->header.nm_flags.recursion_desired) - { - if(prdata != rdata) - SAFE_FREE(prdata); - return; - } - - if (success) - { - rcode = 0; - DEBUG(3,("OK\n")); - } - else - { - rcode = NAM_ERR; - DEBUG(3,("UNKNOWN\n")); - } - - /* See rfc1002.txt 4.2.13. */ - - reply_netbios_packet(p, /* Packet to reply to. */ - rcode, /* Result code. */ - NMB_QUERY, /* nmbd type code. */ - NMB_NAME_QUERY_OPCODE, /* opcode. */ - ttl, /* ttl. */ - prdata, /* data to send. */ - reply_data_len); /* data length. */ - - if(prdata != rdata) - SAFE_FREE(prdata); + /* Look up the name in the cache - if the request is a broadcast request that + came from a subnet we don't know about then search all the broadcast subnets + for a match (as we don't know what interface the request came in on). */ + + if(subrec == remote_broadcast_subnet) + namerec = find_name_for_remote_broadcast_subnet( question, FIND_ANY_NAME); + else + namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME); + + /* Check if it is a name that expired */ + if (namerec && + ((namerec->data.death_time != PERMANENT_TTL) && + (namerec->data.death_time < p->timestamp))) { + DEBUG(5,("process_name_query_request: expired name %s\n", nmb_namestr(&namerec->name))); + namerec = NULL; + } + + if (namerec) { + /* + * Always respond to unicast queries. + * Don't respond to broadcast queries unless the query is for + * a name we own, a Primary Domain Controller name, or a WINS_PROXY + * name with type 0 or 0x20. WINS_PROXY names are only ever added + * into the namelist if we were configured as a WINS proxy. + */ + + if (!bcast || + (bcast && ((name_type == 0x1b) || + (namerec->data.source == SELF_NAME) || + (namerec->data.source == PERMANENT_NAME) || + ((namerec->data.source == WINS_PROXY_NAME) && + ((name_type == 0) || (name_type == 0x20)))))) { + /* The requested name is a directed query, or it's SELF or PERMANENT or WINS_PROXY, + or it's a Domain Master type. */ + + /* + * If this is a WINS_PROXY_NAME, then ceck that none of the IP + * addresses we are returning is on the same broadcast subnet + * as the requesting packet. If it is then don't reply as the + * actual machine will be replying also and we don't want two + * replies to a broadcast query. + */ + + if (namerec->data.source == WINS_PROXY_NAME) { + for( i = 0; i < namerec->data.num_ips; i++) { + if (same_net(namerec->data.ip[i], subrec->myip, subrec->mask_ip)) { + DEBUG(5,("process_name_query_request: 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), subrec->subnet_name )); + return; + } + } + } + + ttl = (namerec->data.death_time != PERMANENT_TTL) ? + namerec->data.death_time - p->timestamp : lp_max_ttl(); + + /* Copy all known ip addresses into the return data. */ + /* Optimise for the common case of one IP address so + we don't need a malloc. */ + + if (namerec->data.num_ips == 1) { + prdata = rdata; + } else { + if ((prdata = (char *)malloc( namerec->data.num_ips * 6 )) == NULL) { + DEBUG(0,("process_name_query_request: malloc fail !\n")); + return; + } + } + + for (i = 0; i < namerec->data.num_ips; i++) { + set_nb_flags(&prdata[i*6],namerec->data.nb_flags); + putip((char *)&prdata[2+(i*6)], &namerec->data.ip[i]); + } + + sort_query_replies(prdata, i, p->ip); + + reply_data_len = namerec->data.num_ips * 6; + success = True; + } + } + + /* + * If a machine is broadcasting a name lookup request and we have lp_wins_proxy() + * set we should initiate a WINS query here. On success we add the resolved name + * into our namelist with a type of WINS_PROXY_NAME and then reply to the query. + */ + + if(!success && (namerec == NULL) && we_are_a_wins_client() && lp_wins_proxy() && + bcast && (subrec != remote_broadcast_subnet)) { + make_wins_proxy_name_query_request( subrec, p, question ); + return; + } + + if (!success && bcast) { + if(prdata != rdata) + SAFE_FREE(prdata); + return; /* Never reply with a negative response to broadcasts. */ + } + + /* + * Final check. From observation, if a unicast packet is sent + * to a non-WINS server with the recursion desired bit set + * then never send a negative response. + */ + + if(!success && !bcast && nmb->header.nm_flags.recursion_desired) { + if(prdata != rdata) + SAFE_FREE(prdata); + return; + } + + if (success) { + rcode = 0; + DEBUG(3,("OK\n")); + } else { + rcode = NAM_ERR; + DEBUG(3,("UNKNOWN\n")); + } + + /* See rfc1002.txt 4.2.13. */ + + reply_netbios_packet(p, /* Packet to reply to. */ + rcode, /* Result code. */ + NMB_QUERY, /* nmbd type code. */ + NMB_NAME_QUERY_OPCODE, /* opcode. */ + ttl, /* ttl. */ + prdata, /* data to send. */ + reply_data_len); /* data length. */ + + if(prdata != rdata) + SAFE_FREE(prdata); } |