mirror of
https://git.savannah.gnu.org/git/inetutils.git
synced 2026-01-12 00:19:39 +08:00
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/* tcpget - get single response from a TCP port.
|
|
Copyright (C) 2013-2025 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Inetutils.
|
|
|
|
GNU Inetutils 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 3 of the License, or (at
|
|
your option) any later version.
|
|
|
|
GNU Inetutils 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, see `http://www.gnu.org/licenses/'. */
|
|
|
|
/* Written by Mats Erik Andersson. */
|
|
|
|
/* Tcpget receives and displays whatever text a server cares to send
|
|
* without any interaction from a client and within a set time period.
|
|
* An alarm timer is set to five seconds by default, but the limit
|
|
* can be set to another value with a command line switch, starting
|
|
* at one second, but limited upwards to one hour!
|
|
*
|
|
* Invocation:
|
|
*
|
|
* tcpget [-t secs] host tcp-port
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <netdb.h>
|
|
#include <progname.h>
|
|
#ifdef HAVE_LOCALE_H
|
|
# include <locale.h>
|
|
#endif
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
int fd, opt, rc;
|
|
int timeout = 5; /* Defaulting to five seconds of waiting time. */
|
|
char buffer[256];
|
|
struct addrinfo hints, *ai, *res;
|
|
|
|
set_program_name (argv[0]);
|
|
|
|
#ifdef HAVE_SETLOCALE
|
|
setlocale (LC_ALL, "");
|
|
#endif
|
|
|
|
while ((opt = getopt (argc, argv, "t:")) != -1)
|
|
{
|
|
int t;
|
|
|
|
switch (opt)
|
|
{
|
|
case 't':
|
|
t = atoi (optarg);
|
|
if (t > 0 && t <= 3600 /* on hour */ )
|
|
timeout = t;
|
|
break;
|
|
|
|
default:
|
|
fprintf (stderr, "Usage: %s [-t secs] host port\n", argv[0]);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if (argc < optind + 2)
|
|
return (EXIT_FAILURE);
|
|
|
|
memset (&hints, 0, sizeof (hints));
|
|
hints.ai_family = AF_UNSPEC;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
|
|
rc = getaddrinfo (argv[optind], argv[optind + 1], &hints, &res);
|
|
|
|
if (rc)
|
|
{
|
|
fprintf (stderr, "%s: %s\n", argv[0], gai_strerror (rc));
|
|
return (EXIT_FAILURE);
|
|
}
|
|
|
|
for (ai = res; ai; ai = ai->ai_next)
|
|
{
|
|
fd = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol);
|
|
if (fd < 0)
|
|
continue;
|
|
|
|
if (connect (fd, ai->ai_addr, ai->ai_addrlen) >= 0)
|
|
break;
|
|
|
|
close (fd);
|
|
}
|
|
|
|
freeaddrinfo (res);
|
|
|
|
if (ai && (fd >= 0))
|
|
{
|
|
ssize_t n;
|
|
|
|
alarm (timeout);
|
|
|
|
while ((n = recv (fd, buffer, sizeof (buffer), 0)))
|
|
write (STDOUT_FILENO, buffer, n);
|
|
|
|
close (fd);
|
|
}
|
|
|
|
close (STDIN_FILENO);
|
|
close (STDOUT_FILENO);
|
|
close (STDERR_FILENO);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|