1 /* 2 * Copyright (c) 1995 - 2000 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> 36 RCSID("$Id: mini_inetd.c,v 1.28 2000/10/08 13:38:47 assar 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 `port' emulating inetd. 63 */ 64 65 void 66 mini_inetd (int port) 67 { 68 int error, ret; 69 struct addrinfo *ai, *a, hints; 70 char portstr[NI_MAXSERV]; 71 int n, nalloc, i; 72 int *fds; 73 fd_set orig_read_set, read_set; 74 int max_fd = -1; 75 76 memset (&hints, 0, sizeof(hints)); 77 hints.ai_flags = AI_PASSIVE; 78 hints.ai_socktype = SOCK_STREAM; 79 80 snprintf (portstr, sizeof(portstr), "%d", ntohs(port)); 81 82 error = getaddrinfo (NULL, portstr, &hints, &ai); 83 if (error) 84 errx (1, "getaddrinfo: %s", gai_strerror (error)); 85 86 for (nalloc = 0, a = ai; a != NULL; a = a->ai_next) 87 ++nalloc; 88 89 fds = malloc (nalloc * sizeof(*fds)); 90 if (fds == NULL) 91 errx (1, "mini_inetd: out of memory"); 92 93 FD_ZERO(&orig_read_set); 94 95 for (i = 0, a = ai; a != NULL; a = a->ai_next) { 96 fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol); 97 if (fds[i] < 0) { 98 warn ("socket"); 99 continue; 100 } 101 socket_set_reuseaddr (fds[i], 1); 102 if (bind (fds[i], a->ai_addr, a->ai_addrlen) < 0) 103 err (1, "bind"); 104 if (listen (fds[i], SOMAXCONN) < 0) 105 err (1, "listen"); 106 if (fds[i] >= FD_SETSIZE) 107 errx (1, "fd too large"); 108 FD_SET(fds[i], &orig_read_set); 109 max_fd = max(max_fd, fds[i]); 110 ++i; 111 } 112 freeaddrinfo (ai); 113 if (i == 0) 114 errx (1, "no sockets"); 115 n = i; 116 117 do { 118 read_set = orig_read_set; 119 120 ret = select (max_fd + 1, &read_set, NULL, NULL, NULL); 121 if (ret < 0 && errno != EINTR) 122 err (1, "select"); 123 } while (ret <= 0); 124 125 for (i = 0; i < n; ++i) 126 if (FD_ISSET (fds[i], &read_set)) { 127 accept_it (fds[i]); 128 return; 129 } 130 abort (); 131 } 132