finished the asynchronous browse synchronisation code. It even seems

to work (not a lot of testing yet though).

Now we just need to deal with people worried about having more than
two nmbd processes sometimes. (the async processes are created on
demand for browse sync, so you'll only see more than 2 occasionally)
(This used to be commit a350a54680e4170e2adf571b010ea508e7291780)

1 files changed, 282 insertions, 0 deletions

diff --git a/source3/nmbd/nmbd_synclists.c b/source3/nmbd/nmbd_synclists.c
new file mode 100644
index 0000000000..b62d9b7569
--- /dev/null
+++ b/source3/nmbd/nmbd_synclists.c
@@ -0,0 +1,282 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   
+*/
+
+/* 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 "smb.h"
+
+extern int DEBUGLEVEL;
+
+struct sync_record {
+	struct sync_record *next, *prev;
+	fstring workgroup;
+	fstring server;
+	pstring fname;
+	struct in_addr ip;
+	int pid;
+};
+
+/* a linked list of current sync connections */
+static struct sync_record *syncs;
+
+static FILE *fp;
+
+/*******************************************************************
+  This is the NetServerEnum callback.
+  ******************************************************************/
+static void callback(char *sname, uint32 stype, char *comment)
+{
+	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)
+{
+	extern fstring local_machine;
+	static struct cli_state cli;
+	uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
+
+	if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) {
+		fclose(fp);
+		return;
+	}
+
+	if (!cli_session_request(&cli, name, nm_type, local_machine)) {
+		cli_shutdown(&cli);
+		fclose(fp);
+		return;
+	}
+
+	if (!cli_negprot(&cli)) {
+		cli_shutdown(&cli);
+		return;
+	}
+
+	if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
+		cli_shutdown(&cli);
+		return;
+	}
+
+	if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
+		cli_shutdown(&cli);
+		return;
+	}
+
+	/* Fetch a workgroup list. */
+	cli_NetServerEnum(&cli, workgroup, 
+			  local_type|SV_TYPE_DOMAIN_ENUM,
+			  callback);
+	
+	/* Now fetch a server list. */
+	if (servers) {
+		cli_NetServerEnum(&cli, workgroup, 
+				  local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
+				  callback);
+	}
+	
+	cli_shutdown(&cli);
+}
+
+
+/*******************************************************************
+  initialise a browse sync with another browse server.  Log in on the
+  remote server's SMB port to their IPC$ 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;
+
+	/* Check we're not trying to sync with ourselves. This can
+	   happen if we are a domain *and* a local master browser. */
+	if (ismyip(ip)) {
+		return;
+	}
+
+	s = (struct sync_record *)malloc(sizeof(*s));
+	if (!s) return;
+
+	ZERO_STRUCTP(s);
+	
+	fstrcpy(s->workgroup, work->work_group);
+	fstrcpy(s->server, name);
+	s->ip = ip;
+
+	slprintf(s->fname, sizeof(pstring)-1,
+		 "%s/sync.%d", lp_lockdir(), counter++);
+	string_sub(s->fname,"//", "/");
+	
+	DLIST_ADD(syncs, s);
+
+	/* the parent forks and returns, leaving the child to do the
+	   actual sync */
+	CatchChild();
+	if ((s->pid = fork())) return;
+
+	DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
+		 work->work_group, name, inet_ntoa(ip)));
+
+	fp = fopen(s->fname,"w");
+	if (!fp) _exit(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 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 */
+				fstrcpy(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;
+	fstring server, type_str;
+	unsigned type;
+	pstring comment;
+	pstring line;
+	char *ptr;
+	int count=0;
+
+	f = fopen(s->fname,"r");
+	
+	while (!feof(f)) {
+		
+		if (!fgets_slash(line,sizeof(pstring),f)) continue;
+		
+		ptr = line;
+
+		DEBUG(9,("sync line [%s]\n", line));
+		
+		if (!next_token(&ptr,server,NULL) ||
+		    !next_token(&ptr,type_str,NULL) ||
+		    !next_token(&ptr,comment,NULL)) {
+			continue;
+		}
+
+		sscanf(type_str, "%X", &type);
+
+		complete_one(s, server, type, comment);
+
+		count++;
+	}
+
+	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(s->pid)) {
+			/* it has completed - grab the info */
+			complete_sync(s);
+			DLIST_REMOVE(syncs, s);
+			ZERO_STRUCTP(s);
+			free(s);
+		}
+	}
+}