freebsd-dev/crypto/kerberosIV/lib/roken/mini_inetd.c
2000-12-29 21:00:22 +00:00

199 lines
4.6 KiB
C

/*
* 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("$Id: mini_inetd.c,v 1.18.2.1 2000/10/10 13:22:33 assar Exp $");
#endif
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_NETINET6_IN6_H
#include <netinet6/in6.h>
#endif
#include <roken.h>
static int
listen_v4 (int port)
{
struct sockaddr_in sa;
int s;
s = socket(AF_INET, SOCK_STREAM, 0);
if(s < 0) {
if (errno == ENOSYS)
return -1;
perror("socket");
exit(1);
}
socket_set_reuseaddr (s, 1);
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = port;
sa.sin_addr.s_addr = INADDR_ANY;
if(bind(s, (struct sockaddr*)&sa, sizeof(sa)) < 0){
perror("bind");
exit(1);
}
if(listen(s, SOMAXCONN) < 0){
perror("listen");
exit(1);
}
return s;
}
#ifdef HAVE_IPV6
static int
listen_v6 (int port)
{
struct sockaddr_in6 sa;
int s;
s = socket(AF_INET6, SOCK_STREAM, 0);
if(s < 0) {
if (errno == ENOSYS)
return -1;
perror("socket");
exit(1);
}
socket_set_reuseaddr (s, 1);
memset(&sa, 0, sizeof(sa));
sa.sin6_family = AF_INET6;
sa.sin6_port = port;
sa.sin6_addr = in6addr_any;
if(bind(s, (struct sockaddr*)&sa, sizeof(sa)) < 0){
perror("bind");
exit(1);
}
if(listen(s, SOMAXCONN) < 0){
perror("listen");
exit(1);
}
return s;
}
#endif /* HAVE_IPV6 */
/*
* accept a connection on `s' and pretend it's served by inetd.
*/
static void
accept_it (int s)
{
int s2;
s2 = accept(s, NULL, 0);
if(s2 < 0){
perror("accept");
exit(1);
}
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 ret;
int max_fd = -1;
int sock_v4 = -1;
int sock_v6 = -1;
fd_set orig_read_set, read_set;
FD_ZERO(&orig_read_set);
sock_v4 = listen_v4 (port);
if (sock_v4 >= 0) {
max_fd = max(max_fd, sock_v4);
if (max_fd >= FD_SETSIZE)
errx (1, "fd too large");
FD_SET(sock_v4, &orig_read_set);
}
#ifdef HAVE_IPV6
sock_v6 = listen_v6 (port);
if (sock_v6 >= 0) {
max_fd = max(max_fd, sock_v6);
if (max_fd >= FD_SETSIZE)
errx (1, "fd too large");
FD_SET(sock_v6, &orig_read_set);
}
#endif
do {
read_set = orig_read_set;
ret = select (max_fd + 1, &read_set, NULL, NULL, NULL);
if (ret < 0 && ret != EINTR) {
perror ("select");
exit (1);
}
} while (ret <= 0);
if (sock_v4 > 0 && FD_ISSET (sock_v4, &read_set)) {
accept_it (sock_v4);
return;
}
if (sock_v6 > 0 && FD_ISSET (sock_v6, &read_set)) {
accept_it (sock_v6);
return;
}
abort ();
}