/* Unix SMB/CIFS implementation. wins client name registration and refresh Copyright (C) Andrew Tridgell 2005 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 . */ #include "includes.h" #include "nbt_server/nbt_server.h" #include "nbt_server/wins/winsserver.h" #include "libcli/composite/composite.h" #include "lib/events/events.h" #include "librpc/gen_ndr/ndr_nbt.h" #include "smbd/service_task.h" #include "param/param.h" static void nbtd_wins_refresh_handler(struct composite_context *c); /* we send WINS client requests using our primary network interface */ static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface) { struct nbtd_server *nbtsrv = iface->nbtsrv; return nbtsrv->interfaces->nbtsock; } static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te, struct timeval t, void *private_data); /* retry a WINS name registration */ static void nbtd_wins_register_retry(struct tevent_context *ev, struct tevent_timer *te, struct timeval t, void *private_data) { struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name); nbtd_winsclient_register(iname); } /* start a timer to refresh this name */ static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname) { uint32_t refresh_time; uint32_t max_refresh_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "max_refresh_time", 7200); refresh_time = MIN(max_refresh_time, iname->ttl/2); event_add_timed(iname->iface->nbtsrv->task->event_ctx, iname, timeval_add(&iname->registration_time, refresh_time, 0), nbtd_wins_refresh, iname); } /* called when a wins name refresh has completed */ static void nbtd_wins_refresh_handler(struct composite_context *c) { NTSTATUS status; struct nbt_name_refresh_wins io; struct nbtd_iface_name *iname = talloc_get_type(c->async.private_data, struct nbtd_iface_name); TALLOC_CTX *tmp_ctx = talloc_new(iname); status = nbt_name_refresh_wins_recv(c, tmp_ctx, &io); if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) { /* our WINS server is dead - start registration over from scratch */ DEBUG(2,("Failed to refresh %s with WINS server %s\n", nbt_name_string(tmp_ctx, &iname->name), iname->wins_server)); talloc_free(tmp_ctx); nbtd_winsclient_register(iname); return; } if (!NT_STATUS_IS_OK(status)) { DEBUG(1,("Name refresh failure with WINS for %s - %s\n", nbt_name_string(tmp_ctx, &iname->name), nt_errstr(status))); talloc_free(tmp_ctx); return; } if (io.out.rcode != 0) { DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n", io.out.wins_server, nbt_name_string(tmp_ctx, &iname->name), nt_errstr(nbt_rcode_to_ntstatus(io.out.rcode)))); iname->nb_flags |= NBT_NM_CONFLICT; talloc_free(tmp_ctx); return; } DEBUG(4,("Refreshed name %s with WINS server %s\n", nbt_name_string(tmp_ctx, &iname->name), iname->wins_server)); /* success - start a periodic name refresh */ iname->nb_flags |= NBT_NM_ACTIVE; if (iname->wins_server) { /* * talloc_free() would generate a warning, * so steal it into the tmp context */ talloc_steal(tmp_ctx, iname->wins_server); } iname->wins_server = talloc_steal(iname, io.out.wins_server); iname->registration_time = timeval_current(); nbtd_wins_start_refresh_timer(iname); talloc_free(tmp_ctx); } /* refresh a WINS name registration */ static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te, struct timeval t, void *private_data) { struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name); struct nbtd_interface *iface = iname->iface; struct nbt_name_refresh_wins io; struct composite_context *c; TALLOC_CTX *tmp_ctx = talloc_new(iname); /* setup a wins name refresh request */ io.in.name = iname->name; io.in.wins_servers = (const char **)str_list_make_single(tmp_ctx, iname->wins_server); io.in.wins_port = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx); io.in.addresses = nbtd_address_list(iface, tmp_ctx); io.in.nb_flags = iname->nb_flags; io.in.ttl = iname->ttl; if (!io.in.addresses) { talloc_free(tmp_ctx); return; } c = nbt_name_refresh_wins_send(wins_socket(iface), &io); if (c == NULL) { talloc_free(tmp_ctx); return; } talloc_steal(c, io.in.addresses); c->async.fn = nbtd_wins_refresh_handler; c->async.private_data = iname; talloc_free(tmp_ctx); } /* called when a wins name register has completed */ static void nbtd_wins_register_handler(struct composite_context *c) { NTSTATUS status; struct nbt_name_register_wins io; struct nbtd_iface_name *iname = talloc_get_type(c->async.private_data, struct nbtd_iface_name); TALLOC_CTX *tmp_ctx = talloc_new(iname); status = nbt_name_register_wins_recv(c, tmp_ctx, &io); if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) { /* none of the WINS servers responded - try again periodically */ int wins_retry_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "wins_retry", 300); event_add_timed(iname->iface->nbtsrv->task->event_ctx, iname, timeval_current_ofs(wins_retry_time, 0), nbtd_wins_register_retry, iname); talloc_free(tmp_ctx); return; } if (!NT_STATUS_IS_OK(status)) { DEBUG(1,("Name register failure with WINS for %s - %s\n", nbt_name_string(tmp_ctx, &iname->name), nt_errstr(status))); talloc_free(tmp_ctx); return; } if (io.out.rcode != 0) { DEBUG(1,("WINS server %s rejected name register of %s - %s\n", io.out.wins_server, nbt_name_string(tmp_ctx, &iname->name), nt_errstr(nbt_rcode_to_ntstatus(io.out.rcode)))); iname->nb_flags |= NBT_NM_CONFLICT; talloc_free(tmp_ctx); return; } /* success - start a periodic name refresh */ iname->nb_flags |= NBT_NM_ACTIVE; if (iname->wins_server) { /* * talloc_free() would generate a warning, * so steal it into the tmp context */ talloc_steal(tmp_ctx, iname->wins_server); } iname->wins_server = talloc_steal(iname, io.out.wins_server); iname->registration_time = timeval_current(); nbtd_wins_start_refresh_timer(iname); DEBUG(3,("Registered %s with WINS server %s\n", nbt_name_string(tmp_ctx, &iname->name), iname->wins_server)); talloc_free(tmp_ctx); } /* register a name with our WINS servers */ void nbtd_winsclient_register(struct nbtd_iface_name *iname) { struct nbtd_interface *iface = iname->iface; struct nbt_name_register_wins io; struct composite_context *c; /* setup a wins name register request */ io.in.name = iname->name; io.in.wins_port = lpcfg_nbt_port(iname->iface->nbtsrv->task->lp_ctx); io.in.wins_servers = lpcfg_wins_server_list(iname->iface->nbtsrv->task->lp_ctx); io.in.addresses = nbtd_address_list(iface, iname); io.in.nb_flags = iname->nb_flags; io.in.ttl = iname->ttl; if (!io.in.addresses) { return; } c = nbt_name_register_wins_send(wins_socket(iface), &io); if (c == NULL) { talloc_free(io.in.addresses); return; } talloc_steal(c, io.in.addresses); c->async.fn = nbtd_wins_register_handler; c->async.private_data = iname; }