diff options
Diffstat (limited to 'source3/nmbd/nmbd_subnetdb.c')
| -rw-r--r-- | source3/nmbd/nmbd_subnetdb.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_subnetdb.c b/source3/nmbd/nmbd_subnetdb.c new file mode 100644 index 0000000000..6c6e7adbb8 --- /dev/null +++ b/source3/nmbd/nmbd_subnetdb.c @@ -0,0 +1,394 @@ +/* + 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. + + Revision History: + +*/ + +#include "includes.h" +#include "smb.h" + +extern int ClientNMB; +extern int ClientDGRAM; +extern int global_nmb_port; + +extern fstring myworkgroup; +extern char **my_netbios_names; + +/* This is the broadcast subnets database. */ +struct subnet_record *subnetlist = NULL; + +/* Extra subnets - keep these separate so enumeration code doesn't + run onto it by mistake. */ + +struct subnet_record *unicast_subnet = NULL; +struct subnet_record *remote_broadcast_subnet = NULL; +struct subnet_record *wins_server_subnet = NULL; + +extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */ + +/**************************************************************************** + Add a subnet into the list. + **************************************************************************/ + +static void add_subnet(struct subnet_record *subrec) +{ + DLIST_ADD(subnetlist, subrec); +} + +/* ************************************************************************** ** + * Comparison routine for ordering the splay-tree based namelists assoicated + * with each subnet record. + * + * Input: Item - Pointer to the comparison key. + * Node - Pointer to a node the splay tree. + * + * Output: The return value will be <0 , ==0, or >0 depending upon the + * ordinal relationship of the two keys. + * + * ************************************************************************** ** + */ +static int namelist_entry_compare( ubi_trItemPtr Item, ubi_trNodePtr Node ) + { + struct name_record *NR = (struct name_record *)Node; + + if( DEBUGLVL( 10 ) ) + { + struct nmb_name *Iname = (struct nmb_name *)Item; + + Debug1( "nmbd_subnetdb:namelist_entry_compare()\n" ); + Debug1( "%d == memcmp( \"%s\", \"%s\", %d )\n", + memcmp( Item, &(NR->name), sizeof(struct nmb_name) ), + nmb_namestr(Iname), nmb_namestr(&NR->name), (int)sizeof(struct nmb_name) ); + } + + return( memcmp( Item, &(NR->name), sizeof(struct nmb_name) ) ); + } /* namelist_entry_compare */ + + +/**************************************************************************** +stop listening on a subnet +we don't free the record as we don't have proper reference counting for it +yet and it may be in use by a response record + ****************************************************************************/ +void close_subnet(struct subnet_record *subrec) +{ + DLIST_REMOVE(subnetlist, subrec); + + if (subrec->dgram_sock != -1) { + close(subrec->dgram_sock); + subrec->dgram_sock = -1; + } + if (subrec->nmb_sock != -1) { + close(subrec->nmb_sock); + subrec->nmb_sock = -1; + } +} + + + +/**************************************************************************** + Create a subnet entry. + ****************************************************************************/ + +static struct subnet_record *make_subnet(char *name, enum subnet_type type, + struct in_addr myip, struct in_addr bcast_ip, + struct in_addr mask_ip) +{ + struct subnet_record *subrec = NULL; + int nmb_sock, dgram_sock; + + /* Check if we are creating a non broadcast subnet - if so don't create + sockets. + */ + + if(type != NORMAL_SUBNET) + { + nmb_sock = -1; + dgram_sock = -1; + } + else + { + /* + * Attempt to open the sockets on port 137/138 for this interface + * and bind them. + * Fail the subnet creation if this fails. + */ + + if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr,True)) == -1) + { + if( DEBUGLVL( 0 ) ) + { + Debug1( "nmbd_subnetdb:make_subnet()\n" ); + Debug1( " Failed to open nmb socket on interface %s ", inet_ntoa(myip) ); + Debug1( "for port %d. ", global_nmb_port ); + Debug1( "Error was %s\n", strerror(errno) ); + } + return NULL; + } + + if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr,True)) == -1) + { + if( DEBUGLVL( 0 ) ) + { + Debug1( "nmbd_subnetdb:make_subnet()\n" ); + Debug1( " Failed to open dgram socket on interface %s ", inet_ntoa(myip) ); + Debug1( "for port %d. ", DGRAM_PORT ); + Debug1( "Error was %s\n", strerror(errno) ); + } + return NULL; + } + + /* Make sure we can broadcast from these sockets. */ + set_socket_options(nmb_sock,"SO_BROADCAST"); + set_socket_options(dgram_sock,"SO_BROADCAST"); + + } + + subrec = (struct subnet_record *)malloc(sizeof(*subrec)); + + if (!subrec) + { + DEBUG(0,("make_subnet: malloc fail !\n")); + close(nmb_sock); + close(dgram_sock); + return(NULL); + } + + memset( (char *)subrec, '\0', sizeof(*subrec) ); + (void)ubi_trInitTree( subrec->namelist, + namelist_entry_compare, + ubi_trOVERWRITE ); + + if((subrec->subnet_name = strdup(name)) == NULL) + { + DEBUG(0,("make_subnet: malloc fail for subnet name !\n")); + close(nmb_sock); + close(dgram_sock); + ZERO_STRUCTP(subrec); + SAFE_FREE(subrec); + return(NULL); + } + + DEBUG(2, ("making subnet name:%s ", name )); + DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip))); + DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip))); + + subrec->namelist_changed = False; + subrec->work_changed = False; + + subrec->bcast_ip = bcast_ip; + subrec->mask_ip = mask_ip; + subrec->myip = myip; + subrec->type = type; + subrec->nmb_sock = nmb_sock; + subrec->dgram_sock = dgram_sock; + + return subrec; +} + + +/**************************************************************************** + Create a normal subnet +**************************************************************************/ +struct subnet_record *make_normal_subnet(struct interface *iface) +{ + struct subnet_record *subrec; + + subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET, + iface->ip, iface->bcast, iface->nmask); + if (subrec) { + add_subnet(subrec); + } + return subrec; +} + + +/**************************************************************************** + Create subnet entries. +**************************************************************************/ + +BOOL create_subnets(void) +{ + int num_interfaces = iface_count(); + int i; + struct in_addr unicast_ip, ipzero; + extern struct in_addr loopback_ip; + + if(num_interfaces == 0) + { + DEBUG(0,("create_subnets: No local interfaces !\n")); + return False; + } + + /* + * Create subnets from all the local interfaces and thread them onto + * the linked list. + */ + + for (i = 0 ; i < num_interfaces; i++) + { + struct interface *iface = get_interface(i); + + /* + * We don't want to add a loopback interface, in case + * someone has added 127.0.0.1 for smbd, nmbd needs to + * ignore it here. JRA. + */ + + if (ip_equal(iface->ip, loopback_ip)) { + DEBUG(2,("create_subnets: Ignoring loopback interface.\n" )); + continue; + } + + if (!make_normal_subnet(iface)) return False; + } + + /* + * If we have been configured to use a WINS server, then try and + * get the ip address of it here. If we are the WINS server then + * set the unicast subnet address to be the first of our own real + * addresses. + * + * NOTE: I'm not sure of the implications of WINS server failover + * on this bit of code. Because of failover, the WINS + * server address can change. crh + */ + + if( wins_srv_count() ) + { + struct in_addr real_wins_ip; + real_wins_ip = wins_srv_ip(); + + if (!is_zero_ip(real_wins_ip)) + { + unicast_ip = real_wins_ip; + } + else + { + /* wins_srv_ip() can return a zero IP if all servers are + * either down or incorrectly entered in smb.conf. crh + */ + DEBUG(0,("No 'live' WINS servers found. Check 'wins server' parameter.\n")); + return False; + } + } + else if(lp_we_are_a_wins_server()) + { + /* Pick the first interface ip address as the WINS server ip. */ + unicast_ip = *iface_n_ip(0); + } + else + { + /* We should not be using a WINS server at all. Set the + ip address of the subnet to be zero. */ + zero_ip(&unicast_ip); + } + + /* + * Create the unicast and remote broadcast subnets. + * Don't put these onto the linked list. + * The ip address of the unicast subnet is set to be + * the WINS server address, if it exists, or ipzero if not. + */ + + unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET, + unicast_ip, unicast_ip, unicast_ip); + + zero_ip(&ipzero); + + remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET", + REMOTE_BROADCAST_SUBNET, + ipzero, ipzero, ipzero); + + if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL)) + return False; + + /* + * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on + * the linked list. + */ + + if (lp_we_are_a_wins_server()) + { + if( (wins_server_subnet = make_subnet( "WINS_SERVER_SUBNET", + WINS_SERVER_SUBNET, + ipzero, ipzero, ipzero )) == NULL ) + return False; + } + + return True; +} + +/******************************************************************* +Function to tell us if we can use the unicast subnet. +******************************************************************/ + +BOOL we_are_a_wins_client(void) +{ + static int cache_we_are_a_wins_client = -1; + + if(cache_we_are_a_wins_client == -1) + cache_we_are_a_wins_client = (is_zero_ip(unicast_subnet->myip) ? + False : True); + + return cache_we_are_a_wins_client; +} + +/******************************************************************* +Access function used by NEXT_SUBNET_INCLUDING_UNICAST +******************************************************************/ + +struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec) +{ + if(subrec == unicast_subnet) + return NULL; + else if((subrec->next == NULL) && we_are_a_wins_client()) + return unicast_subnet; + else + return subrec->next; +} + +/******************************************************************* + Access function used by retransmit_or_expire_response_records() in + nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru> + Needed when we need to enumerate all the broadcast, unicast and + WINS subnets. +******************************************************************/ + +struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec) +{ + if(subrec == unicast_subnet) + { + if(wins_server_subnet) + return wins_server_subnet; + else + return NULL; + } + + if(wins_server_subnet && subrec == wins_server_subnet) + return NULL; + + if((subrec->next == NULL) && we_are_a_wins_client()) + return unicast_subnet; + else + return subrec->next; +} |