1/*
2 * Copyright (c) 1995 - 2001 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: mini_inetd.c 14773 2005-04-12 11:29:18Z lha $");
37#endif
38
39#include <err.h>
40#include "roken.h"
41
42/*
43 * accept a connection on `s' and pretend it's served by inetd.
44 */
45
46static void
47accept_it (int s)
48{
49    int s2;
50
51    s2 = accept(s, NULL, NULL);
52    if(s2 < 0)
53	err (1, "accept");
54    close(s);
55    dup2(s2, STDIN_FILENO);
56    dup2(s2, STDOUT_FILENO);
57    /* dup2(s2, STDERR_FILENO); */
58    close(s2);
59}
60
61/*
62 * Listen on a specified port, emulating inetd.
63 */
64
65void ROKEN_LIB_FUNCTION
66mini_inetd_addrinfo (struct addrinfo *ai)
67{
68    int ret;
69    struct addrinfo *a;
70    int n, nalloc, i;
71    int *fds;
72    fd_set orig_read_set, read_set;
73    int max_fd = -1;
74
75    for (nalloc = 0, a = ai; a != NULL; a = a->ai_next)
76	++nalloc;
77
78    fds = malloc (nalloc * sizeof(*fds));
79    if (fds == NULL)
80	errx (1, "mini_inetd: out of memory");
81
82    FD_ZERO(&orig_read_set);
83
84    for (i = 0, a = ai; a != NULL; a = a->ai_next) {
85	fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
86	if (fds[i] < 0) {
87	    warn ("socket af = %d", a->ai_family);
88	    continue;
89	}
90	socket_set_reuseaddr (fds[i], 1);
91	if (bind (fds[i], a->ai_addr, a->ai_addrlen) < 0) {
92	    warn ("bind af = %d", a->ai_family);
93	    close(fds[i]);
94	    continue;
95	}
96	if (listen (fds[i], SOMAXCONN) < 0) {
97	    warn ("listen af = %d", a->ai_family);
98	    close(fds[i]);
99	    continue;
100	}
101	if (fds[i] >= FD_SETSIZE)
102	    errx (1, "fd too large");
103	FD_SET(fds[i], &orig_read_set);
104	max_fd = max(max_fd, fds[i]);
105	++i;
106    }
107    if (i == 0)
108	errx (1, "no sockets");
109    n = i;
110
111    do {
112	read_set = orig_read_set;
113
114	ret = select (max_fd + 1, &read_set, NULL, NULL, NULL);
115	if (ret < 0 && errno != EINTR)
116	    err (1, "select");
117    } while (ret <= 0);
118
119    for (i = 0; i < n; ++i)
120	if (FD_ISSET (fds[i], &read_set)) {
121	    accept_it (fds[i]);
122	    return;
123	}
124    abort ();
125}
126
127void ROKEN_LIB_FUNCTION
128mini_inetd (int port)
129{
130    int error;
131    struct addrinfo *ai, hints;
132    char portstr[NI_MAXSERV];
133
134    memset (&hints, 0, sizeof(hints));
135    hints.ai_flags    = AI_PASSIVE;
136    hints.ai_socktype = SOCK_STREAM;
137    hints.ai_family   = PF_UNSPEC;
138
139    snprintf (portstr, sizeof(portstr), "%d", ntohs(port));
140
141    error = getaddrinfo (NULL, portstr, &hints, &ai);
142    if (error)
143	errx (1, "getaddrinfo: %s", gai_strerror (error));
144
145    mini_inetd_addrinfo(ai);
146
147    freeaddrinfo(ai);
148}
149