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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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "assuan-defs.h"
#ifdef _POSIX_OPEN_MAX
#define MAX_OPEN_FDS _POSIX_OPEN_MAX
#else
#define MAX_OPEN_FDS 20
#endif
#ifdef HAVE_JNLIB_LOGGING
#include "../jnlib/logging.h"
#define LOGERROR1(a,b) log_error ((a), (b))
#else
#define LOGERROR1(a,b) fprintf (stderr, (a), (b))
#endif
static int
writen ( int fd, const char *buffer, size_t length )
{
while (length)
{
int nwritten = write (fd, buffer, length);
if (nwritten < 0)
{
if (errno == EINTR)
continue;
return -1; /* write error */
}
length -= nwritten;
buffer += nwritten;
}
return 0; /* okay */
}
/* 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 (!ctx || !name || !argv || !argv[0])
return ASSUAN_Invalid_Value;
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)->is_server = 0;
(*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)
{
int i, n;
char errbuf[512];
#ifdef HAVE_JNLIB_LOGGING
int log_fd = log_get_fd ();
#endif
/* close all files which will not be duped but keep stderr
and log_stream for now */
n = sysconf (_SC_OPEN_MAX);
if (n < 0)
n = MAX_OPEN_FDS;
for (i=0; i < n; i++)
{
if (i != fileno (stderr)
#ifdef HAVE_JNLIB_LOGGING
&& i != log_fd
#endif
&& i != rp[1] && i != wp[0])
close(i);
}
errno = 0;
/* Dup handles and to stdin/stdout and exec */
if (rp[1] != STDOUT_FILENO)
{
if (dup2 (rp[1], STDOUT_FILENO) == -1)
{
LOGERROR1 ("dup2 failed in child: %s\n", strerror (errno));
_exit (4);
}
close (rp[1]);
}
if (wp[0] != STDIN_FILENO)
{
if (dup2 (wp[0], STDIN_FILENO) == -1)
{
LOGERROR1 ("dup2 failed in child: %s\n", strerror (errno));
_exit (4);
}
close (wp[0]);
}
execv (name, argv);
/* oops - use the pipe to tell the parent about it */
snprintf (errbuf, sizeof(errbuf)-1, "ERR %d can't exec `%s': %.50s\n",
ASSUAN_Problem_Starting_Server, name, strerror (errno));
errbuf[sizeof(errbuf)-1] = 0;
writen (1, errbuf, strlen (errbuf));
_exit (4);
}
close (rp[1]);
close (wp[0]);
/* 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)
{
LOGERROR1 ("can't connect server: `%s'\n", (*ctx)->inbound.line);
err = ASSUAN_Connect_Failed;
}
}
if (err)
{
if ((*ctx)->pid != -1)
waitpid ((*ctx)->pid, NULL, 0); /* FIXME Check return value. */
assuan_deinit_pipe_server (*ctx); /* FIXME: Common code should be factored out. */
}
return err;
}
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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