gnupg/assuan/assuan-socket-connect.c

/* assuan-socket-connect.c - Assuan socket based client
 *	Copyright (C) 2002 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG 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.
 *
 * GnuPG 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <config.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

#include "assuan-defs.h"

#ifdef HAVE_JNLIB_LOGGING
#include "../jnlib/logging.h"
#define LOGERROR(a)      log_error ((a))
#define LOGERROR1(a,b)   log_error ((a), (b))
#define LOGERROR2(a,b,c) log_error ((a), (b), (c))
#define LOGERRORX(a)     log_printf ((a))
#else
#define LOGERROR(a)      fprintf (stderr, (a))
#define LOGERROR1(a,b)   fprintf (stderr, (a), (b))
#define LOGERROR2(a,b,c) fprintf (stderr, (a), (b), (c))
#define LOGERRORX(a)     fputs ((a), stderr)
#endif



static int
do_finish (ASSUAN_CONTEXT ctx)
{
  if (ctx->inbound.fd != -1)
    {
      close (ctx->inbound.fd);
    }
  ctx->inbound.fd = -1;
  ctx->outbound.fd = -1;
  return 0;
}

static void
do_deinit (ASSUAN_CONTEXT ctx)
{
  do_finish (ctx);
}



/* Make a connection to the Unix domain socket NAME and return a new
   Assuan context in CTX.  SERVER_PID is currently not used but may
   becode handy in future. */
AssuanError
assuan_socket_connect (ASSUAN_CONTEXT *r_ctx,
                       const char *name, pid_t server_pid)
{
  AssuanError err;
  ASSUAN_CONTEXT ctx;
  int fd;
  struct sockaddr_un srvr_addr;
  size_t len;

  if (!r_ctx || !name)
    return ASSUAN_Invalid_Value;
  *r_ctx = NULL;

  /* we require that the name starts with a slash, so that we can
     alter reuse this function for other socket types */
  if (*name != '/')
    return ASSUAN_Invalid_Value;
  if (strlen (name)+1 >= sizeof srvr_addr.sun_path)
    return ASSUAN_Invalid_Value;

  err = _assuan_new_context (&ctx); 
  if (err)
      return err;
  ctx->pid = server_pid; /* save it in case we need it later */
  ctx->deinit_handler = do_deinit;
  ctx->finish_handler = do_finish;

  fd = socket (AF_UNIX, SOCK_STREAM, 0);
  if (fd == -1)
    {
      LOGERROR1 ("can't create socket: %s\n", strerror (errno));
      _assuan_release_context (ctx);
      return ASSUAN_General_Error;
    }
    
  memset (&srvr_addr, 0, sizeof srvr_addr );
  srvr_addr.sun_family = AF_UNIX;
  strcpy (srvr_addr.sun_path, name);
  len = (offsetof (struct sockaddr_un, sun_path)
         + strlen (srvr_addr.sun_path) + 1);
    
  if (connect (fd, (struct sockaddr*)&srvr_addr, len) == -1)
    {
      LOGERROR2 ("can't connect to `%s': %s\n", name, strerror (errno));
      _assuan_release_context (ctx);
      close (fd );
      return ASSUAN_Connect_Failed;
    }

  ctx->inbound.fd = fd;
  ctx->outbound.fd = fd;

  /* initial handshake */
  {
    int okay, off;

    err = _assuan_read_from_server (ctx, &okay, &off);
    if (err)
      {
        LOGERROR1 ("can't connect server: %s\n", assuan_strerror (err));
      }
    else if (okay != 1)
      {
        LOGERROR ("can't connect server: `");
        _assuan_log_sanitized_string (ctx->inbound.line);
        LOGERRORX ("'\n");
        err = ASSUAN_Connect_Failed;
      }
  }

  if (err)
    {
      assuan_disconnect (ctx); 
    }
  else
    *r_ctx = ctx;
  return 0;
}