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> 36 RCSID("$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 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 ROKEN_LIB_FUNCTION 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 ROKEN_LIB_FUNCTION 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 } 149