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/*
* Copyright (c) 2006, Nate Nielsen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*
* CONTRIBUTORS
* Nate Nielsen <nielsen@memberwebs.com>
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
static void
usage ()
{
fprintf (stderr, "usage: sockin [-t timeout] socket\n");
fprintf (stderr, " sockin [-t timeout] [-d] socket command arg ...\n");
exit (2);
}
static int
write_all (int fd, void *buf, size_t len)
{
int r;
while (len > 0) {
r = write(fd, buf, len);
if(r >= 0) {
buf += r;
len -= r;
continue;
}
return -1;
}
return 0;
}
static int
connect_sock (const char *path, int timeout)
{
struct sockaddr_un addr;
int len, sock;
/* Connect to the socket */
sock = socket (AF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
err (1, "couldn't create socket");
/* Try to connect once a second for timeout seconds */
for(;;) {
addr.sun_family = AF_UNIX;
strlcpy (addr.sun_path, path, sizeof (addr.sun_path));
len = sizeof(addr) - (sizeof(addr.sun_path) - strlen (addr.sun_path));\
if (connect (sock, (struct sockaddr*)&addr, len) < 0) {
if (errno == EAGAIN || errno == EINTR) {
continue;
} else if (timeout--) {
sleep (1);
continue;
} else {
err (1, "couldn't connect to socket: %s", path);
}
}
break;
}
return sock;
}
int
main (int argc, char* argv[])
{
int timeout = 0;
int daemonize = 0;
int sock, i, r, l;
char buf[128];
const char *path;
char **args;
char *t2;
char ch;
/* Parse the arguments nicely */
while ((ch = getopt (argc, argv, "t:d")) != -1) {
switch(ch) {
/* Config directory */
case 'd':
daemonize = 1;
break;
/* Only print commands */
case 't':
timeout = strtol (optarg, &t2, 10);
if (timeout < 0 || *t2)
err (2, "invalid timeout: %s", optarg);
break;
/* Usage information */
case '?':
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc < 1)
usage ();
/* The socket path */
path = argv[0];
sock = connect_sock (path, timeout);
argc--;
argv++;
/* Command mode */
if (argc) {
/* Allocate a new command line (no chance to free) */
args = (char**)calloc (argc, sizeof (char*));
if (!args)
err (1, "out of memory");
for (i = 0; i < argc; i++)
args[i] = argv[i];
if (daemonize) {
if (daemon (1, 0) < 0)
err (1, "couldn't daemonize process");
}
/* And duplicate our socket onto stdout */
dup2 (sock, 1);
execvp (args[0], args);
err (1, "couldn't execute program: %s", args[0]);
/* Pipe mode */
} else {
/* Handle some signals */
signal (SIGPIPE, SIG_IGN);
for (;;) {
l = read (0, buf, sizeof (buf));
if (l < 0)
err (1, "couldn't read data");
else if(l == 0)
break;
for (;;) {
r = write_all (sock, buf, l);
if (r < 0) {
if (errno != EPIPE)
err (1, "couldn't write data to socket: %s", argv[0]);
/* Try to reconnect when a broken pipe */
close (sock);
sock = connect_sock (path, timeout);
continue;
}
break;
}
}
}
close (sock);
return 0;
}
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