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-rw-r--r--source3/nmbd/nmbd_synclists.c325
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diff --git a/source3/nmbd/nmbd_synclists.c b/source3/nmbd/nmbd_synclists.c
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+/*
+ 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"
+#include "system/filesys.h"
+#include "../librpc/gen_ndr/svcctl.h"
+#include "nmbd/nmbd.h"
+#include "libsmb/libsmb.h"
+#include "libsmb/clirap.h"
+#include "../libcli/smb/smbXcli_base.h"
+#include "lib/util/string_wrappers.h"
+#include "source3/lib/substitute.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 FILE *fp;
+
+/*******************************************************************
+ This is the NetServerEnum callback.
+ Note sname and comment are in UNIX codepage format.
+ ******************************************************************/
+
+static void callback(const char *sname, uint32_t stype,
+ const char *comment, void *state)
+{
+ 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_t local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
+ 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.
+ */
+
+ in_addr_to_sockaddr_storage(&ss, ip);
+
+ status = cli_connect_nb(name, &ss, NBT_SMB_PORT, nm_type,
+ get_local_machine_name(), SMB_SIGNING_DEFAULT,
+ 0, &cli);
+ if (!NT_STATUS_IS_OK(status)) {
+ return;
+ }
+
+ status = smbXcli_negprot(cli->conn,
+ cli->timeout,
+ PROTOCOL_CORE,
+ PROTOCOL_NT1,
+ NULL,
+ NULL,
+ NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ cli_shutdown(cli);
+ return;
+ }
+
+ status = cli_session_setup_anon(cli);
+ if (!NT_STATUS_IS_OK(status)) {
+ cli_shutdown(cli);
+ return;
+ }
+
+ if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
+ cli_shutdown(cli);
+ return;
+ }
+
+ /* All the cli_XX functions take UNIX character set. */
+ fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
+
+ /* Fetch a workgroup list. */
+ cli_NetServerEnum(cli, unix_workgroup,
+ local_type|SV_TYPE_DOMAIN_ENUM,
+ callback, NULL);
+
+ /* Now fetch a server list. */
+ if (servers) {
+ fstrcpy(unix_workgroup, workgroup);
+ cli_NetServerEnum(cli, unix_workgroup,
+ local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
+ callback, NULL);
+ }
+
+ cli_shutdown(cli);
+}
+
+/*******************************************************************
+ initialise a browse sync with another browse server. Log in on the
+ remote server's SMB port to their IPC$ 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;
+ int fd;
+
+ /* 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:
+ 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_lock_directory(), 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 */
+ CatchChild();
+ if ((s->pid = fork())) return;
+
+ BlockSignals( False, SIGTERM );
+
+ DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
+ work->work_group, name, inet_ntoa(ip)));
+
+ fd = open(s->fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
+ if (fd == -1) {
+ _exit(1);
+ }
+
+ fp = fdopen(fd, "w");
+ if (!fp) {
+ _exit(1);
+ }
+ fd = -1;
+
+ sync_child(name, nm_type, work->work_group, ip, local, servers,
+ s->fname);
+
+ fclose(fp);
+ _exit(0);
+}
+
+/**********************************************************************
+ Handle one line from a completed sync file.
+ **********************************************************************/
+
+static void complete_one(struct sync_record *s,
+ char *sname, uint32_t 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)
+{
+ FILE *f;
+ char *server;
+ char *type_str;
+ unsigned type;
+ char *comment;
+ char line[1024];
+ const char *ptr;
+ int count=0;
+
+ f = fopen(s->fname, "r");
+
+ if (!f)
+ return;
+
+ while (!feof(f)) {
+ TALLOC_CTX *frame = NULL;
+
+ if (!fgets_slash(NULL, 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);
+ }
+ 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);
+ }
+ }
+}
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