assuan/src/assuan-socket-connect.c

   1 /* assuan-socket-connect.c - Assuan socket based client
   2  *      Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   3  *
   4  * This file is part of Assuan.
   5  *
   6  * Assuan is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as
   8  * published by the Free Software Foundation; either version 2.1 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * Assuan is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdlib.h>
  22 #include <stddef.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <sys/types.h>
  28 #ifndef HAVE_W32_SYSTEM
  29 #include <sys/socket.h>
  30 #include <sys/un.h>
  31 #else
  32 #include <windows.h>
  33 #endif
  34
  35 #include "assuan-defs.h"
  36
  37 /* Hacks for Slowaris.  */
  38 #ifndef PF_LOCAL
  39 # ifdef PF_UNIX
  40 #  define PF_LOCAL PF_UNIX
  41 # else
  42 #  define PF_LOCAL AF_UNIX
  43 # endif
  44 #endif
  45 #ifndef AF_LOCAL
  46 # define AF_LOCAL AF_UNIX
  47 #endif
  48
  49 #ifndef SUN_LEN
  50 # define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
  51                        + strlen ((ptr)->sun_path))
  52 #endif
  53
  54
  55 static int
  56 do_finish (assuan_context_t ctx)
  57 {
  58   if (ctx->inbound.fd != ASSUAN_INVALID_FD)
  59     {
  60       _assuan_close (ctx->inbound.fd);
  61     }
  62   ctx->inbound.fd = ASSUAN_INVALID_FD;
  63   ctx->outbound.fd = ASSUAN_INVALID_FD;
  64   return 0;
  65 }
  66
  67 static void
  68 do_deinit (assuan_context_t ctx)
  69 {
  70   do_finish (ctx);
  71 }
  72
  73
  74 /* Make a connection to the Unix domain socket NAME and return a new
  75    Assuan context in CTX.  SERVER_PID is currently not used but may
  76    become handy in the future.  */
  77 assuan_error_t
  78 assuan_socket_connect (assuan_context_t *r_ctx,
  79                        const char *name, pid_t server_pid)
  80 {
  81   return assuan_socket_connect_ext (r_ctx, name, server_pid, 0);
  82 }
  83
  84
  85 /* Make a connection to the Unix domain socket NAME and return a new
  86    Assuan context in CTX.  SERVER_PID is currently not used but may
  87    become handy in the future.  With flags set to 1 sendmsg and
  88    recvmsg are used. */
  89 assuan_error_t
  90 assuan_socket_connect_ext (assuan_context_t *r_ctx,
  91                            const char *name, pid_t server_pid,
  92                            unsigned int flags)
  93 {
  94   static struct assuan_io io = { _assuan_simple_read, _assuan_simple_write,
  95                                  NULL, NULL };
  96   assuan_error_t err;
  97   assuan_context_t ctx;
  98   assuan_fd_t fd;
  99   struct sockaddr_un srvr_addr;
 100   size_t len;
 101   const char *s;
 102
 103   if (!r_ctx || !name)
 104     return _assuan_error (ASSUAN_Invalid_Value);
 105   *r_ctx = NULL;
 106
 107   /* We require that the name starts with a slash, so that we
 108      eventually can reuse this function for other socket types.  To
 109      make things easier we allow an optional driver prefix.  */
 110   s = name;
 111   if (*s && s[1] == ':')
 112     s += 2;
 113   if (*s != DIRSEP_C && *s != '/')
 114     return _assuan_error (ASSUAN_Invalid_Value);
 115
 116   if (strlen (name)+1 >= sizeof srvr_addr.sun_path)
 117     return _assuan_error (ASSUAN_Invalid_Value);
 118
 119   err = _assuan_new_context (&ctx);
 120   if (err)
 121       return err;
 122   ctx->deinit_handler = ((flags&1))? _assuan_uds_deinit :  do_deinit;
 123   ctx->finish_handler = do_finish;
 124
 125   fd = _assuan_sock_new (PF_LOCAL, SOCK_STREAM, 0);
 126   if (fd == ASSUAN_INVALID_FD)
 127     {
 128       _assuan_log_printf ("can't create socket: %s\n", strerror (errno));
 129       _assuan_release_context (ctx);
 130       return _assuan_error (ASSUAN_General_Error);
 131     }
 132
 133   memset (&srvr_addr, 0, sizeof srvr_addr);
 134   srvr_addr.sun_family = AF_LOCAL;
 135   strncpy (srvr_addr.sun_path, name, sizeof (srvr_addr.sun_path) - 1);
 136   srvr_addr.sun_path[sizeof (srvr_addr.sun_path) - 1] = 0;
 137   len = SUN_LEN (&srvr_addr);
 138
 139   if ( _assuan_sock_connect (fd, (struct sockaddr *) &srvr_addr, len) == -1 )
 140     {
 141       _assuan_log_printf ("can't connect to `%s': %s\n",
 142                           name, strerror (errno));
 143       _assuan_release_context (ctx);
 144       _assuan_close (fd);
 145       return _assuan_error (ASSUAN_Connect_Failed);
 146     }
 147
 148   ctx->inbound.fd = fd;
 149   ctx->outbound.fd = fd;
 150   ctx->io = &io;
 151   if ((flags&1))
 152     _assuan_init_uds_io (ctx);
 153
 154   /* initial handshake */
 155   {
 156     int okay, off;
 157
 158     err = _assuan_read_from_server (ctx, &okay, &off);
 159     if (err)
 160       _assuan_log_printf ("can't connect to server: %s\n",
 161                           assuan_strerror (err));
 162     else if (okay != 1)
 163       {
 164         /*LOG ("can't connect to server: `");*/
 165         _assuan_log_sanitized_string (ctx->inbound.line);
 166         fprintf (assuan_get_assuan_log_stream (), "'\n");
 167         err = _assuan_error (ASSUAN_Connect_Failed);
 168       }
 169   }
 170
 171   if (err)
 172     {
 173       assuan_disconnect (ctx);
 174     }
 175   else
 176     *r_ctx = ctx;
 177   return 0;
 178 }
 179
 180