first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

1 files changed, 221 insertions, 0 deletions

diff --git a/source4/nmbd/nmbd_winsproxy.c b/source4/nmbd/nmbd_winsproxy.c
new file mode 100644
index 0000000000..2e65ebb612
--- /dev/null
+++ b/source4/nmbd/nmbd_winsproxy.c
@@ -0,0 +1,221 @@
+/* 
+   Unix SMB/CIFS implementation.
+   NBT netbios routines and daemon - version 2
+
+   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.
+   
+*/
+
+#include "includes.h"
+
+/****************************************************************************
+Function called when the name lookup succeeded.
+****************************************************************************/
+
+static void wins_proxy_name_query_request_success( struct subnet_record *subrec,
+                        struct userdata_struct *userdata,
+                        struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec)
+{
+  struct packet_struct *original_packet;
+  struct subnet_record *orig_broadcast_subnet;
+  struct name_record *namerec;
+  uint16 nb_flags;
+  int num_ips;
+  int i;
+  int ttl = 3600; /* By default one hour in the cache. */
+  struct in_addr *iplist;
+
+  /* Extract the original packet and the original broadcast subnet from
+     the userdata. */
+
+  memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) );
+  memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)],
+          sizeof(struct packet_struct *) );
+
+  nb_flags = get_nb_flags( rrec->rdata );
+
+  num_ips = rrec->rdlength / 6;
+  if(num_ips == 0)
+  {
+    DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
+returned for name %s.\n", nmb_namestr(nmbname) ));
+    return;
+  }
+
+  if(num_ips == 1)
+    iplist = &ip;
+  else
+  {
+    if((iplist = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr) )) == NULL)
+    {
+      DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
+      return;
+    }
+
+    for(i = 0; i < num_ips; i++)
+      putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]);
+  }
+
+  /* Add the queried name to the original subnet as a WINS_PROXY_NAME. */
+
+  if(rrec == PERMANENT_TTL)
+    ttl = lp_max_ttl();
+
+  namerec = add_name_to_subnet( orig_broadcast_subnet, nmbname->name,
+                                nmbname->name_type, nb_flags, ttl,
+                                WINS_PROXY_NAME, num_ips, iplist );
+
+  if(iplist != &ip)
+    SAFE_FREE(iplist);
+
+  /*
+   * Check that none of the IP addresses we are returning is on the
+   * same broadcast subnet as the original requesting packet. If it
+   * is then don't reply (although we still need to add the name
+   * to the cache) as the actual machine will be replying also
+   * and we don't want two replies to a broadcast query.
+   */
+
+  if(namerec && original_packet->packet.nmb.header.nm_flags.bcast)
+  {
+    for( i = 0; i < namerec->data.num_ips; i++)
+    {
+      if( same_net( namerec->data.ip[i],
+                    orig_broadcast_subnet->myip,
+                    orig_broadcast_subnet->mask_ip ) )
+      {
+        DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
+proxy name and is also on the same subnet (%s) as the requestor. \
+Not replying.\n",
+                    nmb_namestr(&namerec->name),
+                    orig_broadcast_subnet->subnet_name ) );
+        return;
+      }
+    }
+  }
+
+  /* Finally reply to the original name query. */
+  reply_netbios_packet(original_packet,                /* Packet to reply to. */
+                       0,                              /* Result code. */
+                       NMB_QUERY,                      /* nmbd type code. */
+                       NMB_NAME_QUERY_OPCODE,          /* opcode. */
+                       ttl,                            /* ttl. */
+                       rrec->rdata,                    /* data to send. */
+                       rrec->rdlength);                /* data length. */
+}
+
+/****************************************************************************
+Function called when the name lookup failed.
+****************************************************************************/
+
+static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
+                                    struct response_record *rrec,
+                                    struct nmb_name *question_name, int fail_code)
+{
+  DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
+of name %s.\n", fail_code, nmb_namestr(question_name) ));
+}
+
+/****************************************************************************
+Function to make a deep copy of the userdata we will need when the WINS
+proxy query returns.
+****************************************************************************/
+
+static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
+{
+  struct packet_struct *p, *copy_of_p;
+  struct userdata_struct *new_userdata = 
+        (struct userdata_struct *)malloc( userdata->userdata_len );
+
+  if(new_userdata == NULL)
+    return NULL;
+
+  new_userdata->copy_fn = userdata->copy_fn;
+  new_userdata->free_fn = userdata->free_fn;
+  new_userdata->userdata_len = userdata->userdata_len;
+
+  /* Copy the subnet_record pointer. */
+  memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
+
+  /* Extract the pointer to the packet struct */
+  memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
+         sizeof(struct packet_struct *) );
+
+  /* Do a deep copy of the packet. */
+  if((copy_of_p = copy_packet(p)) == NULL)
+  {
+    SAFE_FREE(new_userdata);
+    return NULL;
+  }
+
+  /* Lock the copy. */
+  copy_of_p->locked = True;
+
+  memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)&copy_of_p,
+          sizeof(struct packet_struct *) );
+
+  return new_userdata;
+}
+
+/****************************************************************************
+Function to free the deep copy of the userdata we used when the WINS
+proxy query returned.
+****************************************************************************/
+
+static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata)
+{
+  struct packet_struct *p;
+
+  /* Extract the pointer to the packet struct */
+  memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
+         sizeof(struct packet_struct *));
+
+  /* Unlock the packet. */
+  p->locked = False;
+
+  free_packet(p);
+  ZERO_STRUCTP(userdata);
+  SAFE_FREE(userdata);
+}
+
+/****************************************************************************
+ Make a WINS query on behalf of a broadcast client name query request.
+****************************************************************************/
+
+void make_wins_proxy_name_query_request( struct subnet_record *subrec, 
+                                         struct packet_struct *incoming_packet,
+                                         struct nmb_name *question_name)
+{
+  long *ud[(sizeof(struct userdata_struct) + sizeof(struct subrec *) + 
+          sizeof(struct packet_struct *))/sizeof(long *) + 1];
+  struct userdata_struct *userdata = (struct userdata_struct *)ud;
+
+  memset(ud, '\0', sizeof(ud));
+ 
+  userdata->copy_fn = wins_proxy_userdata_copy_fn;
+  userdata->free_fn = wins_proxy_userdata_free_fn;
+  userdata->userdata_len = sizeof(ud);
+  memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
+  memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
+          sizeof(struct packet_struct *));
+
+  /* Now use the unicast subnet to query the name with the WINS server. */
+  query_name( unicast_subnet, question_name->name, question_name->name_type,
+              wins_proxy_name_query_request_success,
+              wins_proxy_name_query_request_fail,
+              userdata);
+}