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assuan-connect.c
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/* assuan-connect.c - Establish a connection (client)
* Copyright (C) 2001 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 <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "assuan-defs.h"
/* Connect to a server over a pipe, creating the assuan context and
returning it in CTX. The server filename is NAME, the argument
vector in ARGV. */
AssuanError
assuan_pipe_connect (ASSUAN_CONTEXT *ctx, const char *name, char *const argv[])
{
static int fixed_signals = 0;
AssuanError err;
int rp[2];
int wp[2];
int fd[2];
if (!name || !argv || !argv[0])
return ASSUAN_General_Error;
if (!fixed_signals)
{
struct sigaction act;
sigaction (SIGPIPE, NULL, &act);
if (act.sa_handler == SIG_DFL)
{
act.sa_handler = SIG_IGN;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
sigaction (SIGPIPE, &act, NULL);
}
fixed_signals = 1;
/* FIXME: This is not MT safe */
}
if (pipe (rp) < 0)
return ASSUAN_General_Error;
if (pipe (wp) < 0)
{
close (rp[0]);
close (rp[1]);
return ASSUAN_General_Error;
}
fd[0] = rp[0]; /* Our inbound is read end of read pipe. */
fd[1] = wp[1]; /* Our outbound is write end of write pipe. */
err = assuan_init_pipe_server (ctx, fd); /* FIXME: Common code should be factored out. */
if (err)
{
close (rp[0]);
close (rp[1]);
close (wp[0]);
close (wp[1]);
return err;
}
(*ctx)->pid = fork ();
if ((*ctx)->pid < 0)
{
close (rp[0]);
close (rp[1]);
close (wp[0]);
close (wp[1]);
assuan_deinit_pipe_server (*ctx); /* FIXME: Common code should be factored out. */
return ASSUAN_General_Error;
}
if ((*ctx)->pid == 0)
{
close (rp[0]);
close (wp[1]);
if (rp[1] != STDOUT_FILENO)
{
dup2 (rp[1], STDOUT_FILENO); /* Child's outbound is write end of read pipe. */
close (rp[1]);
}
if (wp[0] != STDIN_FILENO)
{
dup2 (wp[0], STDIN_FILENO); /* Child's inbound is read end of write pipe. */
close (wp[0]);
}
execv (name, argv);
_exit (1);
}
close (rp[1]);
close (wp[0]);
_assuan_read_line (*ctx); /* FIXME: Handshake. */
return 0;
}
void
assuan_pipe_disconnect (ASSUAN_CONTEXT ctx)
{
_assuan_write_line (ctx, "BYE");
close (ctx->inbound.fd);
close (ctx->outbound.fd);
waitpid (ctx->pid, NULL, 0); /* FIXME Check return value. */
assuan_deinit_pipe_server (ctx);
}
pid_t
assuan_get_pid (ASSUAN_CONTEXT ctx)
{
return ctx ? ctx->pid : -1;
}

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