1 /* $OpenBSD: b_sock.c,v 1.44 2014/07/08 09:06:49 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <sys/ioctl.h> 60 #include <sys/socket.h> 61 62 #include <arpa/inet.h> 63 #include <netinet/in.h> 64 #include <netinet/tcp.h> 65 66 #include <errno.h> 67 #include <netdb.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <unistd.h> 71 72 #include <openssl/bio.h> 73 74 #include "cryptlib.h" 75 76 int 77 BIO_get_host_ip(const char *str, unsigned char *ip) 78 { 79 int i; 80 int err = 1; 81 int locked = 0; 82 struct hostent *he; 83 84 if (inet_pton(AF_INET, str, ip) == 1) 85 return (1); 86 87 /* do a gethostbyname */ 88 CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME); 89 locked = 1; 90 he = BIO_gethostbyname(str); 91 if (he == NULL) { 92 BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_BAD_HOSTNAME_LOOKUP); 93 goto err; 94 } 95 96 /* cast to short because of win16 winsock definition */ 97 if ((short)he->h_addrtype != AF_INET) { 98 BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET); 99 goto err; 100 } 101 for (i = 0; i < 4; i++) 102 ip[i] = he->h_addr_list[0][i]; 103 err = 0; 104 105 err: 106 if (locked) 107 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME); 108 if (err) { 109 ERR_asprintf_error_data("host=%s", str); 110 return 0; 111 } else 112 return 1; 113 } 114 115 int 116 BIO_get_port(const char *str, unsigned short *port_ptr) 117 { 118 struct servent *s; 119 long port; 120 char *ep; 121 122 if (str == NULL) { 123 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_NO_PORT_SPECIFIED); 124 return (0); 125 } 126 127 errno = 0; 128 port = strtol(str, &ep, 10); 129 if (str[0] != '\0' && *ep == '\0') { 130 if (errno == ERANGE && (port == LONG_MAX || port == LONG_MIN)) { 131 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER); 132 return (0); 133 } 134 if (port < 0 || port > 65535) { 135 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER); 136 return (0); 137 } 138 139 *port_ptr = (unsigned short)port; 140 return (1); 141 } 142 143 CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME); 144 s = getservbyname(str, "tcp"); 145 if (s != NULL) 146 *port_ptr = ntohs((unsigned short)s->s_port); 147 CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME); 148 149 if (s == NULL) { 150 if (strcmp(str, "http") == 0) 151 *port_ptr = 80; 152 else if (strcmp(str, "telnet") == 0) 153 *port_ptr = 23; 154 else if (strcmp(str, "socks") == 0) 155 *port_ptr = 1080; 156 else if (strcmp(str, "https") == 0) 157 *port_ptr = 443; 158 else if (strcmp(str, "ssl") == 0) 159 *port_ptr = 443; 160 else if (strcmp(str, "ftp") == 0) 161 *port_ptr = 21; 162 else if (strcmp(str, "gopher") == 0) 163 *port_ptr = 70; 164 else { 165 SYSerr(SYS_F_GETSERVBYNAME, errno); 166 ERR_asprintf_error_data("service='%s'", str); 167 return (0); 168 } 169 } 170 return (1); 171 } 172 173 int 174 BIO_sock_error(int sock) 175 { 176 socklen_t len; 177 int err; 178 179 len = sizeof(err); 180 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &len) != 0) 181 return (1); 182 return (err); 183 } 184 185 struct hostent * 186 BIO_gethostbyname(const char *name) 187 { 188 return gethostbyname(name); 189 } 190 191 int 192 BIO_sock_init(void) 193 { 194 return (1); 195 } 196 197 void 198 BIO_sock_cleanup(void) 199 { 200 } 201 202 int 203 BIO_socket_ioctl(int fd, long type, void *arg) 204 { 205 int ret; 206 207 ret = ioctl(fd, type, arg); 208 if (ret < 0) 209 SYSerr(SYS_F_IOCTLSOCKET, errno); 210 return (ret); 211 } 212 213 int 214 BIO_get_accept_socket(char *host, int bind_mode) 215 { 216 int ret = 0; 217 union { 218 struct sockaddr sa; 219 struct sockaddr_in sa_in; 220 struct sockaddr_in6 sa_in6; 221 } server, client; 222 int s = -1, cs, addrlen; 223 unsigned char ip[4]; 224 unsigned short port; 225 char *str = NULL, *e; 226 char *h, *p; 227 unsigned long l; 228 int err_num; 229 230 if ((str = BUF_strdup(host)) == NULL) 231 return (-1); 232 233 h = p = NULL; 234 h = str; 235 for (e = str; *e; e++) { 236 if (*e == ':') { 237 p = e; 238 } else if (*e == '/') { 239 *e = '\0'; 240 break; 241 } 242 } 243 if (p) 244 *p++='\0'; /* points at last ':', '::port' is special [see below] */ 245 else 246 p = h, h = NULL; 247 248 #ifdef EAI_FAMILY 249 do { 250 struct addrinfo *res, hint; 251 252 /* '::port' enforces IPv6 wildcard listener. Some OSes, 253 * e.g. Solaris, default to IPv6 without any hint. Also 254 * note that commonly IPv6 wildchard socket can service 255 * IPv4 connections just as well... */ 256 memset(&hint, 0, sizeof(hint)); 257 hint.ai_flags = AI_PASSIVE; 258 if (h) { 259 if (strchr(h, ':')) { 260 if (h[1] == '\0') 261 h = NULL; 262 hint.ai_family = AF_INET6; 263 } else if (h[0] == '*' && h[1] == '\0') { 264 hint.ai_family = AF_INET; 265 h = NULL; 266 } 267 } 268 269 if (getaddrinfo(h, p, &hint, &res)) 270 break; 271 272 addrlen = res->ai_addrlen <= sizeof(server) ? 273 res->ai_addrlen : sizeof(server); 274 memcpy(&server, res->ai_addr, addrlen); 275 276 freeaddrinfo(res); 277 goto again; 278 } while (0); 279 #endif 280 281 if (!BIO_get_port(p, &port)) 282 goto err; 283 284 memset((char *)&server, 0, sizeof(server)); 285 server.sa_in.sin_family = AF_INET; 286 server.sa_in.sin_port = htons(port); 287 addrlen = sizeof(server.sa_in); 288 289 if (h == NULL || strcmp(h, "*") == 0) 290 server.sa_in.sin_addr.s_addr = INADDR_ANY; 291 else { 292 if (!BIO_get_host_ip(h, &(ip[0]))) 293 goto err; 294 l = (unsigned long)((unsigned long)ip[0]<<24L)| 295 ((unsigned long)ip[1]<<16L)| 296 ((unsigned long)ip[2]<< 8L)| 297 ((unsigned long)ip[3]); 298 server.sa_in.sin_addr.s_addr = htonl(l); 299 } 300 301 again: 302 s = socket(server.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 303 if (s == -1) { 304 SYSerr(SYS_F_SOCKET, errno); 305 ERR_asprintf_error_data("port='%s'", host); 306 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET); 307 goto err; 308 } 309 310 #ifdef SO_REUSEADDR 311 if (bind_mode == BIO_BIND_REUSEADDR) { 312 int i = 1; 313 314 ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&i, sizeof(i)); 315 bind_mode = BIO_BIND_NORMAL; 316 } 317 #endif 318 if (bind(s, &server.sa, addrlen) == -1) { 319 #ifdef SO_REUSEADDR 320 err_num = errno; 321 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) && 322 (err_num == EADDRINUSE)) { 323 client = server; 324 if (h == NULL || strcmp(h, "*") == 0) { 325 if (client.sa.sa_family == AF_INET6) { 326 memset(&client.sa_in6.sin6_addr, 0, sizeof(client.sa_in6.sin6_addr)); 327 client.sa_in6.sin6_addr.s6_addr[15] = 1; 328 } else if (client.sa.sa_family == AF_INET) { 329 client.sa_in.sin_addr.s_addr = htonl(0x7F000001); 330 } else 331 goto err; 332 } 333 cs = socket(client.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 334 if (cs != -1) { 335 int ii; 336 ii = connect(cs, &client.sa, addrlen); 337 close(cs); 338 if (ii == -1) { 339 bind_mode = BIO_BIND_REUSEADDR; 340 close(s); 341 goto again; 342 } 343 /* else error */ 344 } 345 /* else error */ 346 } 347 #endif 348 SYSerr(SYS_F_BIND, err_num); 349 ERR_asprintf_error_data("port='%s'", host); 350 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_BIND_SOCKET); 351 goto err; 352 } 353 if (listen(s, SOMAXCONN) == -1) { 354 SYSerr(SYS_F_BIND, errno); 355 ERR_asprintf_error_data("port='%s'", host); 356 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_LISTEN_SOCKET); 357 goto err; 358 } 359 ret = 1; 360 err: 361 free(str); 362 if ((ret == 0) && (s != -1)) { 363 close(s); 364 s = -1; 365 } 366 return (s); 367 } 368 369 int 370 BIO_accept(int sock, char **addr) 371 { 372 int ret = -1; 373 unsigned long l; 374 unsigned short port; 375 char *p, *tmp; 376 377 struct { 378 socklen_t len; 379 union { 380 struct sockaddr sa; 381 struct sockaddr_in sa_in; 382 struct sockaddr_in6 sa_in6; 383 } from; 384 } sa; 385 386 sa.len = sizeof(sa.from); 387 memset(&sa.from, 0, sizeof(sa.from)); 388 ret = accept(sock, &sa.from.sa, &sa.len); 389 if (ret == -1) { 390 if (BIO_sock_should_retry(ret)) 391 return -2; 392 SYSerr(SYS_F_ACCEPT, errno); 393 BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR); 394 goto end; 395 } 396 397 if (addr == NULL) 398 goto end; 399 400 #ifdef EAI_FAMILY 401 do { 402 char h[NI_MAXHOST], s[NI_MAXSERV]; 403 size_t nl; 404 405 if (getnameinfo(&sa.from.sa, sa.len, h, sizeof(h), 406 s, sizeof(s), NI_NUMERICHOST|NI_NUMERICSERV)) 407 break; 408 nl = strlen(h) + strlen(s) + 2; 409 p = *addr; 410 if (p) { 411 *p = '\0'; 412 if (!(tmp = realloc(p, nl))) { 413 close(ret); 414 ret = -1; 415 free(p); 416 *addr = NULL; 417 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 418 goto end; 419 } 420 p = tmp; 421 } else { 422 p = malloc(nl); 423 } 424 if (p == NULL) { 425 close(ret); 426 ret = -1; 427 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 428 goto end; 429 } 430 *addr = p; 431 snprintf(*addr, nl, "%s:%s", h, s); 432 goto end; 433 } while (0); 434 #endif 435 if (sa.from.sa.sa_family != AF_INET) 436 goto end; 437 l = ntohl(sa.from.sa_in.sin_addr.s_addr); 438 port = ntohs(sa.from.sa_in.sin_port); 439 if (*addr == NULL) { 440 if ((p = malloc(24)) == NULL) { 441 close(ret); 442 ret = -1; 443 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 444 goto end; 445 } 446 *addr = p; 447 } 448 snprintf(*addr, 24, "%d.%d.%d.%d:%d", 449 (unsigned char)(l >> 24L) & 0xff, (unsigned char)(l >> 16L) & 0xff, 450 (unsigned char)(l >> 8L) & 0xff, (unsigned char)(l) & 0xff, port); 451 452 end: 453 return (ret); 454 } 455 456 int 457 BIO_set_tcp_ndelay(int s, int on) 458 { 459 return (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == 0); 460 } 461 462 int 463 BIO_socket_nbio(int s, int mode) 464 { 465 return (BIO_socket_ioctl(s, FIONBIO, &mode) == 0); 466 } 467