crypto/heimdal-0.6.3/lib/roken/mini_inetd.c

   1 /*
   2  * Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
   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>
  36 RCSID("$Id: mini_inetd.c,v 1.30 2002/02/18 19:08:55 joda Exp $");
  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
  46 static void
  47 accept_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
  65 void
  66 mini_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
 127 void
 128 mini_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 }