samba-mirror/source3/libsmb/clidgram.c

/* 
   Unix SMB/Netbios implementation.
   Version 3.0
   client dgram calls
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) Richard Sharpe 2001
   Copyright (C) John Terpstra 2001

   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.
*/

#define NO_SYSLOG

#include "includes.h"

/*
 * cli_send_mailslot, send a mailslot for client code ...
 */

static int dgram_sock = -1;

int cli_send_mailslot(BOOL unique, char *mailslot, char *buf, int len,
		      const char *srcname, int src_type, 
		      const char *dstname, int dest_type,
		      struct in_addr dest_ip, struct in_addr src_ip,
		      int dest_port)
{
  struct packet_struct p;
  struct dgram_packet *dgram = &p.packet.dgram;
  struct sockaddr_in sock_out;
  char *ptr, *p2;
  char tmp[4];

  bzero((char *)&p, sizeof(p));

  /* 
   * First, check if we have an open socket to the dest IP 
   */

  if (dgram_sock < 1) {

    int name_size;

    if ((dgram_sock = open_socket_out(SOCK_DGRAM, &dest_ip, 138, LONG_CONNECT_TIMEOUT)) < 0) {

      DEBUG(4, ("open_sock_out failed ..."));
      return False;

    }

    /* Make it a broadcast socket ... */

    set_socket_options(dgram_sock, "SO_BROADCAST");

    /* Now, bind my addr to it ... */

    bzero((char *)&sock_out, sizeof(sock_out));
    putip((char *)&sock_out.sin_addr, (char *)&src_ip);
    sock_out.sin_port = INADDR_ANY;
    sock_out.sin_family = AF_INET;

    bind(dgram_sock, (struct sockaddr_in *)&sock_out, sizeof(sock_out));

    /* Now, figure out what socket name we were bound to. We want the port */

    name_size = sizeof(sock_out);

    getsockname(dgram_sock, (struct sockaddr_in *)&sock_out, &name_size);

    fprintf(stderr, "Socket bound to IP:%s, port: %d\n", inet_ntoa(sock_out.sin_addr), ntohs(sock_out.sin_port));

  }

  /*
   * Next, build the DGRAM ...
   */

  /* DIRECT GROUP or UNIQUE datagram. */
  dgram->header.msg_type = unique ? 0x10 : 0x11; 
  dgram->header.flags.node_type = M_NODE;
  dgram->header.flags.first = True;
  dgram->header.flags.more = False;
  dgram->header.dgm_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) + ((unsigned)sys_getpid()%(unsigned)100);
  dgram->header.source_ip = src_ip;
  dgram->header.source_port = ntohs(sock_out.sin_port);
  dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  dgram->header.packet_offset = 0;
  
  make_nmb_name(&dgram->source_name,srcname,src_type);
  make_nmb_name(&dgram->dest_name,dstname,dest_type);

  ptr = &dgram->data[0];

  /* Setup the smb part. */
  ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  memcpy(tmp,ptr,4);
  set_message(ptr,17,17 + len,True);
  memcpy(ptr,tmp,4);

  CVAL(ptr,smb_com) = SMBtrans;
  SSVAL(ptr,smb_vwv1,len);
  SSVAL(ptr,smb_vwv11,len);
  SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  SSVAL(ptr,smb_vwv13,3);
  SSVAL(ptr,smb_vwv14,1);
  SSVAL(ptr,smb_vwv15,1);
  SSVAL(ptr,smb_vwv16,2);
  p2 = smb_buf(ptr);
  pstrcpy(p2,mailslot);
  p2 = skip_string(p2,1);

  memcpy(p2,buf,len);
  p2 += len;

  dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */

  p.ip = dest_ip;
  p.port = dest_port;
  p.fd = dgram_sock;
  p.timestamp = time(NULL);
  p.packet_type = DGRAM_PACKET;

  DEBUG(4,("send_mailslot: Sending to mailslot %s from %s IP %s ", mailslot,
                    nmb_namestr(&dgram->source_name), inet_ntoa(src_ip)));
  DEBUG(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), inet_ntoa(dest_ip)));

  return send_packet(&p);

}

/*
 * cli_get_response: Get a response ...
 */
int cli_get_response(BOOL unique, char *mailslot, char *buf, int bufsiz)
{
  struct packet_struct *packet;

  packet = read_packet(dgram_sock, DGRAM_PACKET);

  if (packet) { /* We got one, pull what we want out of the SMB data ... */

    struct dgram_packet *dgram = &packet->packet.dgram;

    /*
     * We should probably parse the SMB, but for now, we will pull what
     * from fixed, known locations ...
     */

    /* Copy the data to buffer, respecting sizes ... */

    bcopy(&dgram->data[92], buf, MIN(bufsiz, (dgram->datasize - 92)));

  }
  else 
    return -1;

}

/*
 * cli_get_backup_list: Send a get backup list request ...
 */

static char cli_backup_list[1024];

int cli_get_backup_list(const char *myname, const char *send_to_name)
{
  char outbuf[15];
  char *p;
  struct in_addr sendto_ip, my_ip;

  if (!resolve_name(send_to_name, &sendto_ip, 0x1d)) {

    fprintf(stderr, "Could not resolve name: %s<1D>\n", send_to_name);

  }

  bzero(&my_ip, 4);  /* Cheap way to get 0.0.0.0 in there */
 
  if (!resolve_name(myname, &my_ip, 0x00)) { /* FIXME: Call others here */

    fprintf(stderr, "Could not resolve name: %s<00>\n", myname);

  }

  bzero(cli_backup_list, sizeof(cli_backup_list));
  bzero(outbuf, sizeof(outbuf));

  p = outbuf;

  SCVAL(p, 0, ANN_GetBackupListReq);
  p++;

  SCVAL(p, 0, 1); /* Count pointer ... */
  p++;

  SIVAL(p, 0, 1); /* The sender's token ... */
  p += 4;

  cli_send_mailslot(True, "\\MAILSLOT\\BROWSE", outbuf, PTR_DIFF(p, outbuf),
		    myname, 0, send_to_name, 0x1d, sendto_ip, my_ip, 138);

  /* We should check the error and return if we got one */

  /* Now, get the response ... */

  cli_get_response(True, "\\MAILSLOT\\BROWSE", cli_backup_list, sizeof(cli_backup_list));

  /* Should check the response here ... FIXME */

}

/*
 * cli_get_backup_server: Get the backup list and retrieve a server from it
 */

int cli_get_backup_server(char *my_name, char *target, char *servername, int namesize)
{

  /* Get the backup list first. We could pull this from the cache later */

  cli_get_backup_list(my_name, target);  /* FIXME: Check the response */

  strncpy(servername, cli_backup_list, MIN(16, namesize));

}