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https://github.com/samba-team/samba.git
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a75e9a3ee9
be consistent with the function names
- added WINS client support to the NBT server. It will do initial WINS
registration, and WINS refresh, automatically failing over to
secondary WINS servers and handling multi-homed servers where we need
to register multiple IPs.
- added support for multi-homed name query replies, which are
essential for multi-homed registration as the WINS server will query
us to ensure we have the names when doing the secondary IPs in
multi-homed registration
(This used to be commit a1553fa805
)
259 lines
7.1 KiB
C
259 lines
7.1 KiB
C
/*
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Unix SMB/CIFS implementation.
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NBT interface handling
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Copyright (C) Andrew Tridgell 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "dlinklist.h"
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#include "nbt_server/nbt_server.h"
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#include "smbd/service_task.h"
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/*
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receive an incoming request and dispatch it to the right place
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*/
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static void nbtd_request_handler(struct nbt_name_socket *nbtsock,
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struct nbt_name_packet *packet,
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const char *src_address, int src_port)
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{
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/* if its a WINS query then direct to our WINS server if we
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are running one */
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if ((packet->operation & NBT_FLAG_RECURSION_DESIRED) &&
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!(packet->operation & NBT_FLAG_BROADCAST) &&
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lp_wins_support()) {
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nbtd_query_wins(nbtsock, packet, src_address, src_port);
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return;
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}
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/* see if its from one of our own interfaces - if so, then ignore it */
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if (nbtd_self_packet(nbtsock, packet, src_address, src_port)) {
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DEBUG(10,("Ignoring self packet from %s:%d\n", src_address, src_port));
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return;
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}
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/* the request is to us in our role as a B node */
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switch (packet->operation & NBT_OPCODE) {
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case NBT_OPCODE_QUERY:
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nbtd_request_query(nbtsock, packet, src_address, src_port);
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break;
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case NBT_OPCODE_REGISTER:
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case NBT_OPCODE_REFRESH:
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nbtd_request_defense(nbtsock, packet, src_address, src_port);
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break;
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default:
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nbtd_bad_packet(packet, src_address, "Unexpected opcode");
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break;
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}
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}
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/*
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find a registered name on an interface
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*/
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struct nbtd_iface_name *nbtd_find_iname(struct nbtd_interface *iface,
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struct nbt_name *name,
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uint16_t nb_flags)
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{
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struct nbtd_iface_name *iname;
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for (iname=iface->names;iname;iname=iname->next) {
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if (iname->name.type == name->type &&
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StrCaseCmp(name->name, iname->name.name) == 0 &&
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((iname->nb_flags & nb_flags) == nb_flags)) {
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return iname;
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}
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}
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return NULL;
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}
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/*
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start listening on the given address
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*/
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static NTSTATUS nbtd_add_socket(struct nbtd_server *nbtsrv,
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const char *bind_address,
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const char *address,
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const char *bcast,
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const char *netmask)
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{
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struct nbtd_interface *iface;
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NTSTATUS status;
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struct nbt_name_socket *bcast_nbtsock;
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/*
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we actually create two sockets. One listens on the broadcast address
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for the interface, and the other listens on our specific address. This
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allows us to run with "bind interfaces only" while still receiving
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broadcast addresses, and also simplifies matching incoming requests
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to interfaces
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*/
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iface = talloc(nbtsrv, struct nbtd_interface);
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NT_STATUS_HAVE_NO_MEMORY(iface);
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iface->nbtsrv = nbtsrv;
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iface->bcast_address = talloc_steal(iface, bcast);
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iface->ip_address = talloc_steal(iface, address);
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iface->netmask = talloc_steal(iface, netmask);
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iface->names = NULL;
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if (strcmp(netmask, "0.0.0.0") != 0) {
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bcast_nbtsock = nbt_name_socket_init(iface, nbtsrv->task->event_ctx);
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NT_STATUS_HAVE_NO_MEMORY(bcast_nbtsock);
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status = socket_listen(bcast_nbtsock->sock, bcast, lp_nbt_port(), 0, 0);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("Failed to bind to %s:%d - %s\n",
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bcast, lp_nbt_port(), nt_errstr(status)));
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talloc_free(iface);
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return status;
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}
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nbt_set_incoming_handler(bcast_nbtsock, nbtd_request_handler, iface);
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}
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iface->nbtsock = nbt_name_socket_init(iface, nbtsrv->task->event_ctx);
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NT_STATUS_HAVE_NO_MEMORY(iface->ip_address);
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status = socket_listen(iface->nbtsock->sock, bind_address, lp_nbt_port(), 0, 0);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("Failed to bind to %s:%d - %s\n",
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address, lp_nbt_port(), nt_errstr(status)));
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talloc_free(iface);
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return status;
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}
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/* we need to be able to send broadcasts out */
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socket_set_option(iface->nbtsock->sock, "SO_BROADCAST", "1");
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nbt_set_incoming_handler(iface->nbtsock, nbtd_request_handler, iface);
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if (strcmp(netmask, "0.0.0.0") == 0) {
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DLIST_ADD(nbtsrv->bcast_interface, iface);
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} else {
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DLIST_ADD(nbtsrv->interfaces, iface);
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}
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return NT_STATUS_OK;
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}
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/*
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setup a socket for talking to our WINS servers
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*/
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static NTSTATUS nbtd_add_wins_socket(struct nbtd_server *nbtsrv)
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{
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struct nbtd_interface *iface;
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iface = talloc_zero(nbtsrv, struct nbtd_interface);
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NT_STATUS_HAVE_NO_MEMORY(iface);
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iface->nbtsrv = nbtsrv;
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iface->nbtsock = nbt_name_socket_init(iface, nbtsrv->task->event_ctx);
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NT_STATUS_HAVE_NO_MEMORY(iface->nbtsock);
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DLIST_ADD(nbtsrv->wins_interface, iface);
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return NT_STATUS_OK;
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}
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/*
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setup our listening sockets on the configured network interfaces
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*/
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NTSTATUS nbtd_startup_interfaces(struct nbtd_server *nbtsrv)
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{
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int num_interfaces = iface_count();
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int i;
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TALLOC_CTX *tmp_ctx = talloc_new(nbtsrv);
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NTSTATUS status;
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/* if we are allowing incoming packets from any address, then
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we also need to bind to the wildcard address */
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if (!lp_bind_interfaces_only()) {
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const char *primary_address;
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/* the primary address is the address we will return
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for non-WINS queries not made on a specific
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interface */
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if (num_interfaces > 0) {
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primary_address = sys_inet_ntoa(*iface_n_ip(0));
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} else {
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primary_address = sys_inet_ntoa(interpret_addr2(
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lp_netbios_name()));
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}
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primary_address = talloc_strdup(tmp_ctx, primary_address);
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NT_STATUS_HAVE_NO_MEMORY(primary_address);
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status = nbtd_add_socket(nbtsrv,
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"0.0.0.0",
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primary_address,
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talloc_strdup(tmp_ctx, "255.255.255.255"),
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talloc_strdup(tmp_ctx, "0.0.0.0"));
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NT_STATUS_NOT_OK_RETURN(status);
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}
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for (i=0; i<num_interfaces; i++) {
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const char *address = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_ip(i)));
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const char *bcast = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_bcast(i)));
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const char *netmask = talloc_strdup(tmp_ctx, sys_inet_ntoa(*iface_n_netmask(i)));
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status = nbtd_add_socket(nbtsrv, address, address, bcast, netmask);
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NT_STATUS_NOT_OK_RETURN(status);
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}
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if (lp_wins_server_list()) {
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status = nbtd_add_wins_socket(nbtsrv);
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NT_STATUS_NOT_OK_RETURN(status);
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}
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talloc_free(tmp_ctx);
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return NT_STATUS_OK;
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}
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/*
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form a list of addresses that we should use in name query replies
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*/
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const char **nbtd_address_list(struct nbtd_server *nbtsrv, TALLOC_CTX *mem_ctx)
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{
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const char **ret = NULL;
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struct nbtd_interface *iface;
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int count = 0;
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for (iface=nbtsrv->interfaces;iface;iface=iface->next) {
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const char **ret2 = talloc_realloc(mem_ctx, ret, const char *, count+2);
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if (ret2 == NULL) goto failed;
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ret = ret2;
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ret[count] = talloc_strdup(ret, iface->ip_address);
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if (ret[count] == NULL) goto failed;
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count++;
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}
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ret[count] = NULL;
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return ret;
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failed:
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talloc_free(ret);
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return NULL;
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}
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