1 /* $OpenBSD: b_sock.c,v 1.43 2014/06/24 17:42:54 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 int j, i; 177 int size; 178 179 size = sizeof(int); 180 /* Note: under Windows the third parameter is of type (char *) 181 * whereas under other systems it is (void *) if you don't have 182 * a cast it will choke the compiler: if you do have a cast then 183 * you can either go for (char *) or (void *). 184 */ 185 i = getsockopt(sock, SOL_SOCKET, SO_ERROR, (void *)&j, (void *)&size); 186 if (i < 0) 187 return (1); 188 else 189 return (j); 190 } 191 192 struct hostent * 193 BIO_gethostbyname(const char *name) 194 { 195 return gethostbyname(name); 196 } 197 198 int 199 BIO_sock_init(void) 200 { 201 return (1); 202 } 203 204 void 205 BIO_sock_cleanup(void) 206 { 207 } 208 209 int 210 BIO_socket_ioctl(int fd, long type, void *arg) 211 { 212 int i; 213 214 # define ARG arg 215 216 i = ioctl(fd, type, ARG); 217 if (i < 0) 218 SYSerr(SYS_F_IOCTLSOCKET, errno); 219 return (i); 220 } 221 222 int 223 BIO_get_accept_socket(char *host, int bind_mode) 224 { 225 int ret = 0; 226 union { 227 struct sockaddr sa; 228 struct sockaddr_in sa_in; 229 struct sockaddr_in6 sa_in6; 230 } server, client; 231 int s = -1, cs, addrlen; 232 unsigned char ip[4]; 233 unsigned short port; 234 char *str = NULL, *e; 235 char *h, *p; 236 unsigned long l; 237 int err_num; 238 239 if ((str = BUF_strdup(host)) == NULL) 240 return (-1); 241 242 h = p = NULL; 243 h = str; 244 for (e = str; *e; e++) { 245 if (*e == ':') { 246 p = e; 247 } else if (*e == '/') { 248 *e = '\0'; 249 break; 250 } 251 } 252 if (p) 253 *p++='\0'; /* points at last ':', '::port' is special [see below] */ 254 else 255 p = h, h = NULL; 256 257 #ifdef EAI_FAMILY 258 do { 259 struct addrinfo *res, hint; 260 261 /* '::port' enforces IPv6 wildcard listener. Some OSes, 262 * e.g. Solaris, default to IPv6 without any hint. Also 263 * note that commonly IPv6 wildchard socket can service 264 * IPv4 connections just as well... */ 265 memset(&hint, 0, sizeof(hint)); 266 hint.ai_flags = AI_PASSIVE; 267 if (h) { 268 if (strchr(h, ':')) { 269 if (h[1] == '\0') 270 h = NULL; 271 hint.ai_family = AF_INET6; 272 } else if (h[0] == '*' && h[1] == '\0') { 273 hint.ai_family = AF_INET; 274 h = NULL; 275 } 276 } 277 278 if (getaddrinfo(h, p, &hint, &res)) 279 break; 280 281 addrlen = res->ai_addrlen <= sizeof(server) ? 282 res->ai_addrlen : sizeof(server); 283 memcpy(&server, res->ai_addr, addrlen); 284 285 freeaddrinfo(res); 286 goto again; 287 } while (0); 288 #endif 289 290 if (!BIO_get_port(p, &port)) 291 goto err; 292 293 memset((char *)&server, 0, sizeof(server)); 294 server.sa_in.sin_family = AF_INET; 295 server.sa_in.sin_port = htons(port); 296 addrlen = sizeof(server.sa_in); 297 298 if (h == NULL || strcmp(h, "*") == 0) 299 server.sa_in.sin_addr.s_addr = INADDR_ANY; 300 else { 301 if (!BIO_get_host_ip(h, &(ip[0]))) 302 goto err; 303 l = (unsigned long)((unsigned long)ip[0]<<24L)| 304 ((unsigned long)ip[1]<<16L)| 305 ((unsigned long)ip[2]<< 8L)| 306 ((unsigned long)ip[3]); 307 server.sa_in.sin_addr.s_addr = htonl(l); 308 } 309 310 again: 311 s = socket(server.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 312 if (s == -1) { 313 SYSerr(SYS_F_SOCKET, errno); 314 ERR_asprintf_error_data("port='%s'", host); 315 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET); 316 goto err; 317 } 318 319 #ifdef SO_REUSEADDR 320 if (bind_mode == BIO_BIND_REUSEADDR) { 321 int i = 1; 322 323 ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&i, sizeof(i)); 324 bind_mode = BIO_BIND_NORMAL; 325 } 326 #endif 327 if (bind(s, &server.sa, addrlen) == -1) { 328 #ifdef SO_REUSEADDR 329 err_num = errno; 330 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) && 331 (err_num == EADDRINUSE)) { 332 client = server; 333 if (h == NULL || strcmp(h, "*") == 0) { 334 if (client.sa.sa_family == AF_INET6) { 335 memset(&client.sa_in6.sin6_addr, 0, sizeof(client.sa_in6.sin6_addr)); 336 client.sa_in6.sin6_addr.s6_addr[15] = 1; 337 } else if (client.sa.sa_family == AF_INET) { 338 client.sa_in.sin_addr.s_addr = htonl(0x7F000001); 339 } else 340 goto err; 341 } 342 cs = socket(client.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 343 if (cs != -1) { 344 int ii; 345 ii = connect(cs, &client.sa, addrlen); 346 close(cs); 347 if (ii == -1) { 348 bind_mode = BIO_BIND_REUSEADDR; 349 close(s); 350 goto again; 351 } 352 /* else error */ 353 } 354 /* else error */ 355 } 356 #endif 357 SYSerr(SYS_F_BIND, err_num); 358 ERR_asprintf_error_data("port='%s'", host); 359 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_BIND_SOCKET); 360 goto err; 361 } 362 if (listen(s, SOMAXCONN) == -1) { 363 SYSerr(SYS_F_BIND, errno); 364 ERR_asprintf_error_data("port='%s'", host); 365 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_LISTEN_SOCKET); 366 goto err; 367 } 368 ret = 1; 369 err: 370 free(str); 371 if ((ret == 0) && (s != -1)) { 372 close(s); 373 s = -1; 374 } 375 return (s); 376 } 377 378 int 379 BIO_accept(int sock, char **addr) 380 { 381 int ret = -1; 382 unsigned long l; 383 unsigned short port; 384 char *p, *tmp; 385 386 struct { 387 socklen_t len; 388 union { 389 struct sockaddr sa; 390 struct sockaddr_in sa_in; 391 struct sockaddr_in6 sa_in6; 392 } from; 393 } sa; 394 395 sa.len = sizeof(sa.from); 396 memset(&sa.from, 0, sizeof(sa.from)); 397 ret = accept(sock, &sa.from.sa, &sa.len); 398 if (ret == -1) { 399 if (BIO_sock_should_retry(ret)) 400 return -2; 401 SYSerr(SYS_F_ACCEPT, errno); 402 BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR); 403 goto end; 404 } 405 406 if (addr == NULL) 407 goto end; 408 409 #ifdef EAI_FAMILY 410 do { 411 char h[NI_MAXHOST], s[NI_MAXSERV]; 412 size_t nl; 413 414 if (getnameinfo(&sa.from.sa, sa.len, h, sizeof(h), 415 s, sizeof(s), NI_NUMERICHOST|NI_NUMERICSERV)) 416 break; 417 nl = strlen(h) + strlen(s) + 2; 418 p = *addr; 419 if (p) { 420 *p = '\0'; 421 if (!(tmp = realloc(p, nl))) { 422 close(ret); 423 ret = -1; 424 free(p); 425 *addr = NULL; 426 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 427 goto end; 428 } 429 p = tmp; 430 } else { 431 p = malloc(nl); 432 } 433 if (p == NULL) { 434 close(ret); 435 ret = -1; 436 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 437 goto end; 438 } 439 *addr = p; 440 snprintf(*addr, nl, "%s:%s", h, s); 441 goto end; 442 } while (0); 443 #endif 444 if (sa.from.sa.sa_family != AF_INET) 445 goto end; 446 l = ntohl(sa.from.sa_in.sin_addr.s_addr); 447 port = ntohs(sa.from.sa_in.sin_port); 448 if (*addr == NULL) { 449 if ((p = malloc(24)) == NULL) { 450 close(ret); 451 ret = -1; 452 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 453 goto end; 454 } 455 *addr = p; 456 } 457 snprintf(*addr, 24, "%d.%d.%d.%d:%d", 458 (unsigned char)(l >> 24L) & 0xff, (unsigned char)(l >> 16L) & 0xff, 459 (unsigned char)(l >> 8L) & 0xff, (unsigned char)(l) & 0xff, port); 460 461 end: 462 return (ret); 463 } 464 465 int 466 BIO_set_tcp_ndelay(int s, int on) 467 { 468 return (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == 0); 469 } 470 471 int 472 BIO_socket_nbio(int s, int mode) 473 { 474 int ret = -1; 475 int l; 476 477 l = mode; 478 ret = BIO_socket_ioctl(s, FIONBIO, &l); 479 480 return (ret == 0); 481 } 482