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25043ebb2e
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14897 Signed-off-by: Ralph Boehme <slow@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>
321 lines
8.5 KiB
C
321 lines
8.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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NBT netbios routines and daemon - version 2
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Copyright (C) Andrew Tridgell 1994-1998
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Copyright (C) Luke Kenneth Casson Leighton 1994-1998
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Copyright (C) Jeremy Allison 1994-1998
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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/* this file handles asynchronous browse synchronisation requests. The
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requests are done by forking and putting the result in a file in the
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locks directory. We do it this way because we don't want nmbd to be
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blocked waiting for some server to respond on a TCP connection. This
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also allows us to have more than 1 sync going at once (tridge) */
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#include "includes.h"
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#include "system/filesys.h"
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#include "../librpc/gen_ndr/svcctl.h"
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#include "nmbd/nmbd.h"
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#include "libsmb/libsmb.h"
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#include "libsmb/clirap.h"
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#include "../libcli/smb/smbXcli_base.h"
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#include "lib/util/string_wrappers.h"
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#include "source3/lib/substitute.h"
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struct sync_record {
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struct sync_record *next, *prev;
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unstring workgroup;
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unstring server;
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char *fname;
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struct in_addr ip;
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pid_t pid;
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};
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/* a linked list of current sync connections */
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static struct sync_record *syncs;
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static FILE *fp;
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/*******************************************************************
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This is the NetServerEnum callback.
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Note sname and comment are in UNIX codepage format.
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******************************************************************/
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static void callback(const char *sname, uint32_t stype,
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const char *comment, void *state)
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{
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fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
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}
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/*******************************************************************
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Synchronise browse lists with another browse server.
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Log in on the remote server's SMB port to their IPC$ service,
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do a NetServerEnum and record the results in fname
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******************************************************************/
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static void sync_child(char *name, int nm_type,
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char *workgroup,
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struct in_addr ip, bool local, bool servers,
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char *fname)
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{
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fstring unix_workgroup;
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struct cli_state *cli;
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uint32_t local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
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struct sockaddr_storage ss;
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NTSTATUS status;
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/* W2K DMB's return empty browse lists on port 445. Use 139.
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* Patch from Andy Levine andyl@epicrealm.com.
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*/
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in_addr_to_sockaddr_storage(&ss, ip);
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status = cli_connect_nb(name, &ss, NBT_SMB_PORT, nm_type,
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get_local_machine_name(), SMB_SIGNING_DEFAULT,
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0, &cli);
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if (!NT_STATUS_IS_OK(status)) {
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return;
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}
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status = smbXcli_negprot(cli->conn, cli->timeout, PROTOCOL_CORE,
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PROTOCOL_NT1);
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if (!NT_STATUS_IS_OK(status)) {
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cli_shutdown(cli);
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return;
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}
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status = cli_session_setup_anon(cli);
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if (!NT_STATUS_IS_OK(status)) {
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cli_shutdown(cli);
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return;
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}
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if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
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cli_shutdown(cli);
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return;
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}
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/* All the cli_XX functions take UNIX character set. */
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fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
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/* Fetch a workgroup list. */
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cli_NetServerEnum(cli, unix_workgroup,
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local_type|SV_TYPE_DOMAIN_ENUM,
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callback, NULL);
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/* Now fetch a server list. */
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if (servers) {
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fstrcpy(unix_workgroup, workgroup);
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cli_NetServerEnum(cli, unix_workgroup,
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local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
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callback, NULL);
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}
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cli_shutdown(cli);
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}
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/*******************************************************************
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initialise a browse sync with another browse server. Log in on the
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remote server's SMB port to their IPC$ service, do a NetServerEnum
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and record the results
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******************************************************************/
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void sync_browse_lists(struct work_record *work,
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char *name, int nm_type,
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struct in_addr ip, bool local, bool servers)
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{
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struct sync_record *s;
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static int counter;
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int fd;
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/* Check we're not trying to sync with ourselves. This can
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happen if we are a domain *and* a local master browser. */
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if (ismyip_v4(ip)) {
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done:
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return;
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}
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s = SMB_MALLOC_P(struct sync_record);
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if (!s) goto done;
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ZERO_STRUCTP(s);
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unstrcpy(s->workgroup, work->work_group);
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unstrcpy(s->server, name);
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s->ip = ip;
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if (asprintf(&s->fname, "%s/sync.%d", lp_lock_directory(), counter++) < 0) {
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SAFE_FREE(s);
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goto done;
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}
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/* Safe to use as 0 means no size change. */
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all_string_sub(s->fname,"//", "/", 0);
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DLIST_ADD(syncs, s);
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/* the parent forks and returns, leaving the child to do the
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actual sync */
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CatchChild();
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if ((s->pid = fork())) return;
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BlockSignals( False, SIGTERM );
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DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
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work->work_group, name, inet_ntoa(ip)));
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fd = open(s->fname, O_WRONLY|O_CREAT|O_TRUNC, 0644);
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if (fd == -1) {
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_exit(1);
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}
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fp = fdopen(fd, "w");
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if (!fp) {
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_exit(1);
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}
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fd = -1;
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sync_child(name, nm_type, work->work_group, ip, local, servers,
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s->fname);
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fclose(fp);
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_exit(0);
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}
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/**********************************************************************
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Handle one line from a completed sync file.
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**********************************************************************/
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static void complete_one(struct sync_record *s,
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char *sname, uint32_t stype, char *comment)
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{
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struct work_record *work;
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struct server_record *servrec;
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stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
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if (stype & SV_TYPE_DOMAIN_ENUM) {
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/* See if we can find the workgroup on this subnet. */
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if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
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/* We already know about this workgroup -
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update the ttl. */
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update_workgroup_ttl(work,lp_max_ttl());
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} else {
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/* Create the workgroup on the subnet. */
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work = create_workgroup_on_subnet(unicast_subnet,
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sname, lp_max_ttl());
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if (work) {
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/* remember who the master is */
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unstrcpy(work->local_master_browser_name, comment);
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}
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}
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return;
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}
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work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
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if (!work) {
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DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
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s->workgroup));
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return;
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}
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if ((servrec = find_server_in_workgroup( work, sname))) {
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/* Check that this is not a locally known
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server - if so ignore the entry. */
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if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
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/* We already know about this server - update
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the ttl. */
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update_server_ttl(servrec, lp_max_ttl());
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/* Update the type. */
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servrec->serv.type = stype;
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}
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return;
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}
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/* Create the server in the workgroup. */
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create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
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}
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/**********************************************************************
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Read the completed sync info.
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**********************************************************************/
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static void complete_sync(struct sync_record *s)
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{
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FILE *f;
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char *server;
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char *type_str;
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unsigned type;
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char *comment;
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char line[1024];
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const char *ptr;
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int count=0;
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f = fopen(s->fname, "r");
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if (!f)
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return;
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while (!feof(f)) {
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TALLOC_CTX *frame = NULL;
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if (!fgets_slash(NULL, line, sizeof(line), f))
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continue;
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ptr = line;
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frame = talloc_stackframe();
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if (!next_token_talloc(frame,&ptr,&server,NULL) ||
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!next_token_talloc(frame,&ptr,&type_str,NULL) ||
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!next_token_talloc(frame,&ptr,&comment,NULL)) {
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TALLOC_FREE(frame);
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continue;
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}
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sscanf(type_str, "%X", &type);
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complete_one(s, server, type, comment);
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count++;
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TALLOC_FREE(frame);
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}
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fclose(f);
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unlink(s->fname);
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DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
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s->server, inet_ntoa(s->ip), s->workgroup, count));
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}
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/**********************************************************************
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Check for completion of any of the child processes.
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**********************************************************************/
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void sync_check_completion(void)
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{
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struct sync_record *s, *next;
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for (s=syncs;s;s=next) {
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next = s->next;
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if (!process_exists_by_pid(s->pid)) {
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/* it has completed - grab the info */
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complete_sync(s);
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DLIST_REMOVE(syncs, s);
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SAFE_FREE(s->fname);
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SAFE_FREE(s);
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}
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}
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}
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