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/*
* Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$KTH: mini_inetd.c,v 1.28 2000/10/08 13:38:47 assar Exp $");
#endif
#include "telnetd.h"
#include <err.h>
#ifndef max
#define max(a,b) (((a)>(b))?(a):(b))
#endif
/*
* accept a connection on `s' and pretend it's served by inetd.
*/
static void
accept_it (int s)
{
int s2;
s2 = accept(s, NULL, NULL);
if(s2 < 0)
err (1, "accept");
close(s);
dup2(s2, STDIN_FILENO);
dup2(s2, STDOUT_FILENO);
/* dup2(s2, STDERR_FILENO); */
close(s2);
}
/*
* Listen on `port' emulating inetd.
*/
void
mini_inetd (int port)
{
int error, ret;
struct addrinfo *ai, *a, hints;
char portstr[NI_MAXSERV];
int n, nalloc, i;
int *fds;
fd_set orig_read_set, read_set;
int max_fd = -1;
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;
snprintf (portstr, sizeof(portstr), "%d", ntohs(port));
error = getaddrinfo (NULL, portstr, &hints, &ai);
if (error)
errx (1, "getaddrinfo: %s", gai_strerror (error));
for (nalloc = 0, a = ai; a != NULL; a = a->ai_next)
++nalloc;
fds = malloc (nalloc * sizeof(*fds));
if (fds == NULL)
errx (1, "mini_inetd: out of memory");
FD_ZERO(&orig_read_set);
for (i = 0, a = ai; a != NULL; a = a->ai_next) {
fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
if (fds[i] < 0) {
warn ("socket");
continue;
}
socket_set_reuseaddr (fds[i], 1);
if (bind (fds[i], a->ai_addr, a->ai_addrlen) < 0)
err (1, "bind");
if (listen (fds[i], SOMAXCONN) < 0)
err (1, "listen");
if (fds[i] >= FD_SETSIZE)
errx (1, "fd too large");
FD_SET(fds[i], &orig_read_set);
max_fd = max(max_fd, fds[i]);
++i;
}
freeaddrinfo (ai);
if (i == 0)
errx (1, "no sockets");
n = i;
do {
read_set = orig_read_set;
ret = select (max_fd + 1, &read_set, NULL, NULL, NULL);
if (ret < 0 && errno != EINTR)
err (1, "select");
} while (ret <= 0);
for (i = 0; i < n; ++i)
if (FD_ISSET (fds[i], &read_set)) {
accept_it (fds[i]);
return;
}
abort ();
}
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