jeremy is going to hate me for this.

created an "nmb-agent" utility that, yes: it connects to the 137 socket
and accepts unix socket connections which it redirects onto port 137.

it uses the name_trn_id field to filter requests to the correct
location.

name_query() and name_status() are the first victims to use this
feature (by specifying a file descriptor of -1).
(This used to be commit d923bc8da2cf996408194d98381409191dd81a16)

1 files changed, 515 insertions, 0 deletions

diff --git a/source3/utils/nmb-agent.c b/source3/utils/nmb-agent.c
new file mode 100644
index 0000000000..12795e5bdd
--- /dev/null
+++ b/source3/utils/nmb-agent.c
@@ -0,0 +1,515 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 2
+   SMB agent/socket plugin
+   Copyright (C) Andrew Tridgell 1999
+   
+   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.
+*/
+
+#include "includes.h"
+#include "smb.h"
+
+#define SECURITY_MASK 0
+#define SECURITY_SET  0
+
+/* this forces non-unicode */
+#define CAPABILITY_MASK CAP_UNICODE
+#define CAPABILITY_SET  0
+
+/* and non-unicode for the client too */
+#define CLI_CAPABILITY_MASK CAP_UNICODE
+#define CLI_CAPABILITY_SET  0
+
+extern int DEBUGLEVEL;
+
+static int ClientNMB = -1;
+
+struct sock_redir
+{
+	int c;
+	int c_trn_id;
+	int s_trn_id;
+	struct nmb_state *n;
+	time_t time;
+
+};
+
+static uint32 num_socks = 0;
+static struct sock_redir **socks = NULL;
+
+/****************************************************************************
+terminate sockent connection
+****************************************************************************/
+static void sock_redir_free(struct sock_redir *sock)
+{
+	close(sock->c);
+	sock->c = -1;
+	if (sock->n != NULL)
+	{
+#if 0
+		free(sock->n);
+#endif
+		sock->n = NULL;
+	}
+#if 0
+	free(sock);
+#endif
+	ZERO_STRUCTP(sock);
+}
+
+/****************************************************************************
+free a sockent array
+****************************************************************************/
+static void free_sock_array(uint32 num_entries, struct sock_redir **entries)
+{
+	void(*fn)(void*) = (void(*)(void*))&sock_redir_free;
+	free_void_array(num_entries, (void**)entries, *fn);
+}
+
+/****************************************************************************
+add a sockent state to the array
+****************************************************************************/
+static struct sock_redir* add_sock_to_array(uint32 *len,
+				struct sock_redir ***array,
+				struct sock_redir *sock)
+{
+	int i;
+	for (i = 0; i < num_socks; i++)
+	{
+		if (socks[i] == NULL)
+		{
+			socks[i] = sock;
+			return sock;
+		}
+	}
+
+	return (struct sock_redir*)add_item_to_array(len,
+	                     (void***)array, (void*)sock);
+				
+}
+
+/****************************************************************************
+initiate sockent array
+****************************************************************************/
+void init_sock_redir(void)
+{
+	socks = NULL;
+	num_socks = 0;
+}
+
+/****************************************************************************
+terminate sockent array
+****************************************************************************/
+void free_sock_redir(void)
+{
+	free_sock_array(num_socks, socks);
+	init_sock_redir();
+}
+
+/****************************************************************************
+create a new sockent state from user credentials
+****************************************************************************/
+static struct sock_redir *sock_redir_get(int fd)
+{
+	struct sock_redir *sock;
+
+	sock = (struct sock_redir*)malloc(sizeof(*sock));
+
+	if (sock == NULL)
+	{
+		return NULL;
+	}
+
+	ZERO_STRUCTP(sock);
+
+	sock->c = fd;
+	sock->n = NULL;
+	sock->time = time(NULL);
+
+	DEBUG(10,("sock_redir_get:\tfd:\t%d\t\n", fd));
+
+	return sock;
+}
+
+/****************************************************************************
+init sock state
+****************************************************************************/
+static void sock_add(int fd)
+{
+	struct sock_redir *sock;
+	sock = sock_redir_get(fd);
+	if (sock != NULL)
+	{
+		add_sock_to_array(&num_socks, &socks, sock);
+	}
+}
+
+/****************************************************************************
+delete a sockent state
+****************************************************************************/
+static BOOL sock_del(int fd)
+{
+	int i;
+
+	for (i = 0; i < num_socks; i++)
+	{
+		if (socks[i] == NULL) continue;
+		if (socks[i]->c == fd) 
+		{
+			sock_redir_free(socks[i]);
+			socks[i] = NULL;
+			return True;
+		}
+	}
+
+	return False;
+}
+
+static void filter_reply(struct packet_struct *p, int tr_id)
+{
+	p->packet.nmb.header.name_trn_id = tr_id;
+}
+
+static BOOL process_cli_sock(struct sock_redir **sock)
+{
+	struct packet_struct *p;
+	struct nmb_state *nmb;
+	static uint16 trn_id = 0x0;
+
+	p = receive_packet((*sock)->c, NMB_SOCK_PACKET, 0);
+	if (p == NULL)
+	{
+		DEBUG(0,("client closed connection\n"));
+		return False;
+	}
+
+	nmb = (struct nmb_state*)malloc(sizeof(struct nmb_state));
+	if (nmb == NULL)
+	{
+		return False;
+	}
+
+	(*sock)->n = nmb;
+	(*sock)->c_trn_id = p->packet.nmb.header.name_trn_id;
+	(*sock)->s_trn_id = trn_id;
+	trn_id++;
+	if (trn_id > 0xffff)
+	{
+		trn_id = 0x0;
+	}
+
+	DEBUG(10,("new trn_id: %d\n", trn_id));
+
+	filter_reply(p, (*sock)->s_trn_id);
+
+	nmb->ip = p->ip;
+	nmb->port = p->port;
+
+	p->fd = ClientNMB;
+	p->packet_type = NMB_PACKET;
+
+	if (!send_packet(p))
+	{
+		DEBUG(0,("server is dead\n"));
+		return False;
+	}			
+	return True;
+}
+
+static BOOL process_srv_sock(struct sock_redir *sock, struct packet_struct *p)
+{
+	int nmb_id;
+	int tr_id;
+	if (p == NULL)
+	{
+		return False;
+	}
+
+	nmb_id = p->packet.nmb.header.name_trn_id;
+	tr_id = sock->s_trn_id;
+
+	DEBUG(10,("process_srv_sock:\tnmb_id:\t%d\n", nmb_id));
+
+	DEBUG(10,("list:\tfd:\t%d\tnmb_id:\t%d\ttr_id:\t%d\n",
+		   sock->c,
+		   nmb_id,
+		   tr_id));
+
+	if (nmb_id != tr_id)
+	{
+		return False;
+	}
+
+	filter_reply(p, sock->c_trn_id);
+	p->fd = sock->c;
+	p->packet_type = NMB_SOCK_PACKET;
+
+	if (!send_packet(p))
+	{
+		DEBUG(0,("client is dead\n"));
+	}			
+	return True;
+}
+
+static void start_agent(void)
+{
+	int s, c;
+	struct sockaddr_un sa;
+	fstring path;
+	fstring dir;
+
+	CatchChild();
+
+	slprintf(dir, sizeof(dir)-1, "/tmp/.nmb");
+	mkdir(dir, 0777);
+
+	slprintf(path, sizeof(path)-1, "%s/agent", dir);
+	if (chmod(dir, 0777) < 0)
+	{
+		fprintf(stderr, "chmod on %s failed\n", sa.sun_path);
+		exit(1);
+	}
+
+
+	/* start listening on unix socket */
+	s = socket(AF_UNIX, SOCK_STREAM, 0);
+
+	if (s < 0)
+	{
+		fprintf(stderr, "socket open failed\n");
+		exit(1);
+	}
+
+	ZERO_STRUCT(sa);
+	sa.sun_family = AF_UNIX;
+	safe_strcpy(sa.sun_path, path, sizeof(sa.sun_path)-1);
+
+	if (bind(s, (struct sockaddr*) &sa, sizeof(sa)) < 0)
+	{
+		fprintf(stderr, "socket bind to %s failed\n", sa.sun_path);
+		close(s);
+		remove(path);
+		exit(1);
+	}
+
+	if (s == -1)
+	{
+		DEBUG(0,("bind failed\n"));
+		remove(path);
+		exit(1);
+	}
+
+	if (listen(s, 5) == -1)
+	{
+		DEBUG(0,("listen failed\n"));
+		remove(path);
+	}
+
+	while (1)
+	{
+		int i;
+		fd_set fds;
+		int num;
+		struct sockaddr_un addr;
+		int in_addrlen = sizeof(addr);
+		int maxfd = s;
+		struct packet_struct *p = NULL;
+		time_t current_time = time(NULL);
+		
+		FD_ZERO(&fds);
+		FD_SET(s, &fds);
+		FD_SET(ClientNMB, &fds);
+		maxfd = MAX(ClientNMB, maxfd);
+
+		for (i = 0; i < num_socks; i++)
+		{
+			if (socks[i] != NULL)
+			{
+				int fd = socks[i]->c;
+				FD_SET(fd, &fds);
+				maxfd = MAX(maxfd, fd);
+
+			}
+		}
+
+		dbgflush();
+		num = sys_select(maxfd+1,&fds,NULL, NULL);
+
+		if (num <= 0)
+		{
+			continue;
+		}
+
+		if (FD_ISSET(s, &fds))
+		{
+			c = accept(s, (struct sockaddr*)&addr, &in_addrlen);
+			if (c != -1)
+			{
+				sock_add(c);
+			}
+		}
+
+		if (FD_ISSET(ClientNMB, &fds))
+		{
+			p = receive_packet(ClientNMB, NMB_PACKET, 0);
+			if (p && !p->packet.nmb.header.response)
+			{
+				free(p);
+				p = NULL;
+			}
+		}
+		else
+		{
+			p = NULL;
+		}
+		for (i = 0; i < num_socks; i++)
+		{
+			if (socks[i] == NULL)
+			{
+				continue;
+			}
+			if (FD_ISSET(socks[i]->c, &fds))
+			{
+				if (!process_cli_sock(&socks[i]))
+				{
+					sock_redir_free(socks[i]);
+					socks[i] = NULL;
+				}
+			}
+			
+			if (p == NULL)
+			{
+				continue;
+			}
+
+			if (socks[i] == NULL)
+			{
+				continue;
+			}
+
+			if (process_srv_sock(socks[i], p) ||
+				current_time > socks[i]->time + 5)
+			{
+				sock_redir_free(socks[i]);
+				socks[i] = NULL;
+			}
+		}
+
+		if (p != NULL)
+		{
+			free(p);
+			p = NULL;
+		}
+	}
+}
+
+/**************************************************************************** **
+ open the socket communication
+ **************************************************************************** */
+static BOOL open_sockets(BOOL isdaemon, int port)
+{
+  /* The sockets opened here will be used to receive broadcast
+     packets *only*. Interface specific sockets are opened in
+     make_subnet() in namedbsubnet.c. Thus we bind to the
+     address "0.0.0.0". The parameter 'socket address' is
+     now deprecated.
+   */
+
+  if ( isdaemon )
+    ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0);
+  else
+    ClientNMB = 0;
+  
+  if ( ClientNMB == -1 )
+    return( False );
+
+  /* we are never interested in SIGPIPE */
+  BlockSignals(True,SIGPIPE);
+
+  set_socket_options( ClientNMB,   "SO_BROADCAST" );
+
+  DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
+  return( True );
+} /* open_sockets */
+
+/****************************************************************************
+usage on the program
+****************************************************************************/
+static void usage(char *pname)
+{
+  printf("Usage: %s [-D]", pname);
+
+  printf("\nVersion %s\n",VERSION);
+  printf("\t-D 		run as a daemon\n");
+  printf("\t-h 		usage\n");
+  printf("\n");
+}
+
+int main(int argc, char *argv[])
+{
+	pstring configfile;
+	BOOL is_daemon = False;
+	int opt;
+	extern pstring debugf;
+	int global_nmb_port = NMB_PORT;
+
+	TimeInit();
+
+	pstrcpy(configfile,CONFIGFILE);
+ 
+	while ((opt = getopt(argc, argv, "Dh")) != EOF)
+	{
+		switch (opt)
+		{
+			case 'D':
+			{
+				is_daemon = True;
+				break;
+			}
+			case 'h':
+			default:
+			{
+				usage(argv[0]);
+				break;
+			}
+		}
+	}
+
+	slprintf(debugf, sizeof(debugf)-1, "log.%s", argv[0]);
+	setup_logging(argv[0], !is_daemon);
+  
+	charset_initialise();
+
+	if (!lp_load(configfile,True,False,False))
+	{
+		DEBUG(0,("Unable to load config file\n"));
+	}
+
+	if (is_daemon)
+	{
+		DEBUG(0,("%s: becoming daemon\n", argv[0]));
+		become_daemon();
+	}
+
+	if (!open_sockets(True, global_nmb_port))
+	{
+		return 1;
+	}
+
+	start_agent();
+
+	return 0;
+}