/* 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 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/>. */ /* this file handles asynchronous browse synchronisation requests. The requests are done by forking and putting the result in a file in the locks directory. We do it this way because we don't want nmbd to be blocked waiting for some server to respond on a TCP connection. This also allows us to have more than 1 sync going at once (tridge) */ #include "includes.h" struct sync_record { struct sync_record *next, *prev; unstring workgroup; unstring server; char *fname; struct in_addr ip; pid_t pid; }; /* a linked list of current sync connections */ static struct sync_record *syncs; static XFILE *fp; /******************************************************************* This is the NetServerEnum callback. Note sname and comment are in UNIX codepage format. ******************************************************************/ static void callback(const char *sname, uint32 stype, const char *comment, void *state) { x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment); } /******************************************************************* Synchronise browse lists with another browse server. Log in on the remote server's SMB port to their IPC$ service, do a NetServerEnum and record the results in fname ******************************************************************/ static void sync_child(char *name, int nm_type, char *workgroup, struct in_addr ip, bool local, bool servers, char *fname) { fstring unix_workgroup; struct cli_state *cli; uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0; struct nmb_name called, calling; struct sockaddr_storage ss; NTSTATUS status; /* W2K DMB's return empty browse lists on port 445. Use 139. * Patch from Andy Levine andyl@epicrealm.com. */ cli = cli_initialise(); if (!cli) { return; } if (!cli_set_port(cli, 139)) { return; } in_addr_to_sockaddr_storage(&ss, ip); status = cli_connect(cli, name, &ss); if (!NT_STATUS_IS_OK(status)) { return; } make_nmb_name(&calling, get_local_machine_name(), 0x0); make_nmb_name(&called , name, nm_type); if (!cli_session_request(cli, &calling, &called)) { cli_shutdown(cli); return; } if (!cli_negprot(cli)) { cli_shutdown(cli); return; } if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0, workgroup))) { cli_shutdown(cli); return; } if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) { cli_shutdown(cli); return; } /* All the cli_XX functions take UNIX character set. */ fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup); /* Fetch a workgroup list. */ cli_NetServerEnum(cli, unix_workgroup, local_type|SV_TYPE_DOMAIN_ENUM, callback, NULL); /* Now fetch a server list. */ if (servers) { fstrcpy(unix_workgroup, workgroup); cli_NetServerEnum(cli, unix_workgroup, local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL, callback, NULL); } cli_shutdown(cli); } /******************************************************************* initialise a browse sync with another browse server. Log in on the remote server's SMB port to their IPC$ service, do a NetServerEnum and record the results ******************************************************************/ void sync_browse_lists(struct work_record *work, char *name, int nm_type, struct in_addr ip, bool local, bool servers) { struct sync_record *s; static int counter; START_PROFILE(sync_browse_lists); /* Check we're not trying to sync with ourselves. This can happen if we are a domain *and* a local master browser. */ if (ismyip_v4(ip)) { done: END_PROFILE(sync_browse_lists); return; } s = SMB_MALLOC_P(struct sync_record); if (!s) goto done; ZERO_STRUCTP(s); unstrcpy(s->workgroup, work->work_group); unstrcpy(s->server, name); s->ip = ip; if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) { SAFE_FREE(s); goto done; } /* Safe to use as 0 means no size change. */ all_string_sub(s->fname,"//", "/", 0); DLIST_ADD(syncs, s); /* the parent forks and returns, leaving the child to do the actual sync and call END_PROFILE*/ CatchChild(); if ((s->pid = sys_fork())) return; BlockSignals( False, SIGTERM ); DEBUG(2,("Initiating browse sync for %s to %s(%s)\n", work->work_group, name, inet_ntoa(ip))); fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644); if (!fp) { END_PROFILE(sync_browse_lists); _exit(1); } sync_child(name, nm_type, work->work_group, ip, local, servers, s->fname); x_fclose(fp); END_PROFILE(sync_browse_lists); _exit(0); } /********************************************************************** Handle one line from a completed sync file. **********************************************************************/ static void complete_one(struct sync_record *s, char *sname, uint32 stype, char *comment) { struct work_record *work; struct server_record *servrec; stype &= ~SV_TYPE_LOCAL_LIST_ONLY; if (stype & SV_TYPE_DOMAIN_ENUM) { /* See if we can find the workgroup on this subnet. */ if((work=find_workgroup_on_subnet(unicast_subnet, sname))) { /* We already know about this workgroup - update the ttl. */ update_workgroup_ttl(work,lp_max_ttl()); } else { /* Create the workgroup on the subnet. */ work = create_workgroup_on_subnet(unicast_subnet, sname, lp_max_ttl()); if (work) { /* remember who the master is */ unstrcpy(work->local_master_browser_name, comment); } } return; } work = find_workgroup_on_subnet(unicast_subnet, s->workgroup); if (!work) { DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n", s->workgroup)); return; } if ((servrec = find_server_in_workgroup( work, sname))) { /* Check that this is not a locally known server - if so ignore the entry. */ if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) { /* We already know about this server - update the ttl. */ update_server_ttl(servrec, lp_max_ttl()); /* Update the type. */ servrec->serv.type = stype; } return; } /* Create the server in the workgroup. */ create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment); } /********************************************************************** Read the completed sync info. **********************************************************************/ static void complete_sync(struct sync_record *s) { XFILE *f; char *server; char *type_str; unsigned type; char *comment; char line[1024]; const char *ptr; int count=0; f = x_fopen(s->fname,O_RDONLY, 0); if (!f) return; while (!x_feof(f)) { TALLOC_CTX *frame = NULL; if (!fgets_slash(line,sizeof(line),f)) continue; ptr = line; frame = talloc_stackframe(); if (!next_token_talloc(frame,&ptr,&server,NULL) || !next_token_talloc(frame,&ptr,&type_str,NULL) || !next_token_talloc(frame,&ptr,&comment,NULL)) { TALLOC_FREE(frame); continue; } sscanf(type_str, "%X", &type); complete_one(s, server, type, comment); count++; TALLOC_FREE(frame); } x_fclose(f); unlink(s->fname); DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n", s->server, inet_ntoa(s->ip), s->workgroup, count)); } /********************************************************************** Check for completion of any of the child processes. **********************************************************************/ void sync_check_completion(void) { struct sync_record *s, *next; for (s=syncs;s;s=next) { next = s->next; if (!process_exists_by_pid(s->pid)) { /* it has completed - grab the info */ complete_sync(s); DLIST_REMOVE(syncs, s); SAFE_FREE(s->fname); SAFE_FREE(s); } } }