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#include <config.h> 35 36#include <err.h> 37#include "roken.h" 38 39/* 40 * accept a connection on `s' and pretend it's served by inetd. 41 */ 42 43static void 44accept_it (rk_socket_t s, rk_socket_t *ret_socket) 45{ 46 rk_socket_t as; 47 48 as = accept(s, NULL, NULL); 49 if(rk_IS_BAD_SOCKET(as)) 50 err (1, "accept"); 51 52 if (ret_socket) { 53 54 *ret_socket = as; 55 56 } else { 57 int fd = socket_to_fd(as, 0); 58 59 /* We would use _O_RDONLY for the socket_to_fd() call for 60 STDIN, but there are instances where we assume that STDIN 61 is a r/w socket. */ 62 63 dup2(fd, STDIN_FILENO); 64 dup2(fd, STDOUT_FILENO); 65 66 rk_closesocket(as); 67 } 68} 69 70/** 71 * Listen on a specified addresses 72 * 73 * Listens on the specified addresses for incoming connections. If 74 * the \a ret_socket parameter is \a NULL, on return STDIN and STDOUT 75 * will be connected to an accepted socket. If the \a ret_socket 76 * parameter is non-NULL, the accepted socket will be returned in 77 * *ret_socket. In the latter case, STDIN and STDOUT will be left 78 * unmodified. 79 * 80 * This function does not return if there is an error or if no 81 * connection is established. 82 * 83 * @param[in] ai Addresses to listen on 84 * @param[out] ret_socket If non-NULL receives the accepted socket. 85 * 86 * @see mini_inetd() 87 */ 88ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL 89mini_inetd_addrinfo (struct addrinfo *ai, rk_socket_t *ret_socket) 90{ 91 int ret; 92 struct addrinfo *a; 93 int n, nalloc, i; 94 rk_socket_t *fds; 95 fd_set orig_read_set, read_set; 96 rk_socket_t max_fd = (rk_socket_t)-1; 97 98 for (nalloc = 0, a = ai; a != NULL; a = a->ai_next) 99 ++nalloc; 100 101 fds = malloc (nalloc * sizeof(*fds)); 102 if (fds == NULL) { 103 errx (1, "mini_inetd: out of memory"); 104 UNREACHABLE(return); 105 } 106 107 FD_ZERO(&orig_read_set); 108 109 for (i = 0, a = ai; a != NULL; a = a->ai_next) { 110 fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol); 111 if (rk_IS_BAD_SOCKET(fds[i])) 112 continue; 113 socket_set_reuseaddr (fds[i], 1); 114 socket_set_ipv6only(fds[i], 1); 115 if (rk_IS_SOCKET_ERROR(bind (fds[i], a->ai_addr, a->ai_addrlen))) { 116 warn ("bind af = %d", a->ai_family); 117 rk_closesocket(fds[i]); 118 fds[i] = rk_INVALID_SOCKET; 119 continue; 120 } 121 if (rk_IS_SOCKET_ERROR(listen (fds[i], SOMAXCONN))) { 122 warn ("listen af = %d", a->ai_family); 123 rk_closesocket(fds[i]); 124 fds[i] = rk_INVALID_SOCKET; 125 continue; 126 } 127#ifndef NO_LIMIT_FD_SETSIZE 128 if (fds[i] >= FD_SETSIZE) 129 errx (1, "fd too large"); 130#endif 131 FD_SET(fds[i], &orig_read_set); 132 max_fd = max(max_fd, fds[i]); 133 ++i; 134 } 135 if (i == 0) 136 errx (1, "no sockets"); 137 n = i; 138 139 do { 140 read_set = orig_read_set; 141 142 ret = select (max_fd + 1, &read_set, NULL, NULL, NULL); 143 if (rk_IS_SOCKET_ERROR(ret) && rk_SOCK_ERRNO != EINTR) 144 err (1, "select"); 145 } while (ret <= 0); 146 147 for (i = 0; i < n; ++i) 148 if (FD_ISSET (fds[i], &read_set)) { 149 accept_it (fds[i], ret_socket); 150 for (i = 0; i < n; ++i) 151 rk_closesocket(fds[i]); 152 free(fds); 153 return; 154 } 155 abort (); 156} 157 158/** 159 * Listen on a specified port 160 * 161 * Listens on the specified port for incoming connections. If the \a 162 * ret_socket parameter is \a NULL, on return STDIN and STDOUT will be 163 * connected to an accepted socket. If the \a ret_socket parameter is 164 * non-NULL, the accepted socket will be returned in *ret_socket. In 165 * the latter case, STDIN and STDOUT will be left unmodified. 166 * 167 * This function does not return if there is an error or if no 168 * connection is established. 169 * 170 * @param[in] port Port to listen on 171 * @param[out] ret_socket If non-NULL receives the accepted socket. 172 * 173 * @see mini_inetd_addrinfo() 174 */ 175ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL 176mini_inetd(int port, rk_socket_t * ret_socket) 177{ 178 int error; 179 struct addrinfo *ai, hints; 180 char portstr[NI_MAXSERV]; 181 182 memset (&hints, 0, sizeof(hints)); 183 hints.ai_flags = AI_PASSIVE; 184 hints.ai_socktype = SOCK_STREAM; 185 hints.ai_family = PF_UNSPEC; 186 187 snprintf (portstr, sizeof(portstr), "%d", ntohs(port)); 188 189 error = getaddrinfo (NULL, portstr, &hints, &ai); 190 if (error) 191 errx (1, "getaddrinfo: %s", gai_strerror (error)); 192 193 mini_inetd_addrinfo(ai, ret_socket); 194 195 freeaddrinfo(ai); 196} 197 198