Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 320 insertions, 0 deletions

diff --git a/source3/nmbd/nmbd_synclists.c b/source3/nmbd/nmbd_synclists.c
new file mode 100644
index 0000000..d291927
--- /dev/null
+++ b/source3/nmbd/nmbd_synclists.c
@@ -0,0 +1,320 @@
+/* 
+   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);
+	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);
+		}
+	}
+}