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fdpassing.c
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fdpassing.c
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/* fdpassing - Check the fiel descriptor passing.
Copyright (C) 2006, 2009 Free Software Foundation, Inc.
This file is part of Assuan.
Assuan is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 3 of
the License, or (at your option) any later version.
Assuan 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h> /* Used by main driver. */
#include "../src/assuan.h"
#include "common.h"
/*
S E R V E R
*/
static gpg_error_t
cmd_echo (assuan_context_t ctx, char *line)
{
int fd;
int c;
FILE *fp;
int nbytes;
log_info ("got ECHO command (%s)\n", line);
fd = assuan_get_input_fd (ctx);
if (fd == -1)
return gpg_error (GPG_ERR_ASS_NO_INPUT);
fp = fdopen (fd, "r");
if (!fp)
{
log_error ("fdopen failed on input fd: %s\n", strerror (errno));
return gpg_error (GPG_ERR_ASS_GENERAL);
}
nbytes = 0;
while ( (c=getc (fp)) != -1)
{
putc (c, stdout);
nbytes++;
}
fflush (stdout);
log_info ("done printing %d bytes to stdout\n", nbytes);
fclose (fp);
return 0;
}
static gpg_error_t
register_commands (assuan_context_t ctx)
{
static struct
{
const char *name;
gpg_error_t (*handler) (assuan_context_t, char *line);
} table[] =
{
{ "ECHO", cmd_echo },
{ "INPUT", NULL },
{ "OUTPUT", NULL },
{ NULL, NULL }
};
int i;
gpg_error_t rc;
for (i=0; table[i].name; i++)
{
rc = assuan_register_command (ctx, table[i].name, table[i].handler, NULL);
if (rc)
return rc;
}
return 0;
}
static void
server (void)
{
int rc;
assuan_context_t ctx;
log_info ("server started\n");
rc = assuan_new (&ctx);
if (rc)
log_fatal ("assuan_new failed: %s\n", gpg_strerror (rc));
rc = assuan_init_pipe_server (ctx, NULL);
if (rc)
log_fatal ("assuan_init_pipe_server failed: %s\n", gpg_strerror (rc));
rc = register_commands (ctx);
if (rc)
log_fatal ("register_commands failed: %s\n", gpg_strerror(rc));
assuan_set_log_stream (ctx, stderr);
for (;;)
{
rc = assuan_accept (ctx);
if (rc)
{
if (rc != -1)
log_error ("assuan_accept failed: %s\n", gpg_strerror (rc));
break;
}
log_info ("client connected. Client's pid is %ld\n",
(long)assuan_get_pid (ctx));
rc = assuan_process (ctx);
if (rc)
log_error ("assuan_process failed: %s\n", gpg_strerror (rc));
}
assuan_release (ctx);
}
/*
C L I E N T
*/
/* Client main. If true is returned, a disconnect has not been done. */
static int
client (assuan_context_t ctx, const char *fname)
{
int rc;
FILE *fp;
int i;
log_info ("client started. Servers's pid is %ld\n",
(long)assuan_get_pid (ctx));
for (i=0; i < 6; i++)
{
fp = fopen (fname, "r");
if (!fp)
{
log_error ("failed to open `%s': %s\n", fname,
strerror (errno));
return -1;
}
rc = assuan_sendfd (ctx, fileno (fp));
if (rc)
{
log_error ("assuan_sendfd failed: %s\n", gpg_strerror (rc));
return -1;
}
fclose (fp);
rc = assuan_transact (ctx, "INPUT FD", NULL, NULL, NULL, NULL,
NULL, NULL);
if (rc)
{
log_error ("sending INPUT FD failed: %s\n", gpg_strerror (rc));
return -1;
}
rc = assuan_transact (ctx, "ECHO", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
{
log_error ("sending ECHO failed: %s\n", gpg_strerror (rc));
return -1;
}
}
/* Give us some time to check with lsof that all descriptors are closed. */
/* sleep (10); */
assuan_release (ctx);
return 0;
}
/*
M A I N
*/
int
main (int argc, char **argv)
{
int last_argc = -1;
assuan_context_t ctx;
gpg_error_t err;
int no_close_fds[2];
const char *arglist[10];
int is_server = 0;
int with_exec = 0;
char *fname = prepend_srcdir ("motd");
if (argc)
{
log_set_prefix (*argv);
argc--; argv++;
}
while (argc && last_argc != argc )
{
last_argc = argc;
if (!strcmp (*argv, "--help"))
{
puts (
"usage: ./fdpassing [options]\n"
"\n"
"Options:\n"
" --verbose Show what is going on\n"
" --with-exec Exec the child. Default is just a fork\n"
);
exit (0);
}
if (!strcmp (*argv, "--verbose"))
{
verbose = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--debug"))
{
verbose = debug = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--server"))
{
is_server = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--with-exec"))
{
with_exec = 1;
argc--; argv++;
}
}
assuan_set_assuan_log_prefix (log_prefix);
if (is_server)
{
server ();
log_info ("server finished\n");
}
else
{
const char *loc;
no_close_fds[0] = 2;
no_close_fds[1] = -1;
if (with_exec)
{
arglist[0] = "fdpassing";
arglist[1] = "--server";
arglist[2] = verbose? "--verbose":NULL;
arglist[3] = NULL;
}
err = assuan_new (&ctx);
if (err)
log_fatal ("assuan_new failed: %s\n", gpg_strerror (err));
err = assuan_pipe_connect (ctx, with_exec? "./fdpassing":NULL,
with_exec ? arglist : &loc,
no_close_fds, NULL, NULL, 1);
if (err)
{
log_error ("assuan_pipe_connect failed: %s\n", gpg_strerror (err));
return 1;
}
if (!with_exec && loc[0] == 's')
{
server ();
log_info ("server finished\n");
}
else
{
if (client (ctx, fname))
{
log_info ("waiting for server to terminate...\n");
assuan_release (ctx);
}
log_info ("client finished\n");
}
}
return errorcount ? 1 : 0;
}

File Metadata

Mime Type
text/x-c
Expires
Mon, Dec 23, 2:09 PM (22 h, 7 m)
Storage Engine
local-disk
Storage Format
Raw Data
Storage Handle
9b/9f/4c56e710347e17cb6bb5d7d4d264

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