1 /* $OpenBSD: b_sock.c,v 1.52 2014/07/10 13:58:22 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 #include <string.h> 62 63 #include <arpa/inet.h> 64 #include <netinet/in.h> 65 #include <netinet/tcp.h> 66 67 #include <errno.h> 68 #include <limits.h> 69 #include <netdb.h> 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <unistd.h> 73 74 #include <openssl/bio.h> 75 76 #include "cryptlib.h" 77 78 int 79 BIO_get_host_ip(const char *str, unsigned char *ip) 80 { 81 int i; 82 int err = 1; 83 int locked = 0; 84 struct hostent *he; 85 86 if (inet_pton(AF_INET, str, ip) == 1) 87 return (1); 88 89 /* do a gethostbyname */ 90 CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME); 91 locked = 1; 92 he = BIO_gethostbyname(str); 93 if (he == NULL) { 94 BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_BAD_HOSTNAME_LOOKUP); 95 goto err; 96 } 97 98 /* cast to short because of win16 winsock definition */ 99 if ((short)he->h_addrtype != AF_INET) { 100 BIOerr(BIO_F_BIO_GET_HOST_IP, 101 BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET); 102 goto err; 103 } 104 for (i = 0; i < 4; i++) 105 ip[i] = he->h_addr_list[0][i]; 106 err = 0; 107 108 err: 109 if (locked) 110 CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME); 111 if (err) { 112 ERR_asprintf_error_data("host=%s", str); 113 return 0; 114 } else 115 return 1; 116 } 117 118 int 119 BIO_get_port(const char *str, unsigned short *port_ptr) 120 { 121 struct addrinfo *res = NULL; 122 struct addrinfo hints = { 123 .ai_family = AF_UNSPEC, 124 .ai_socktype = SOCK_STREAM, 125 .ai_flags = AI_PASSIVE, 126 }; 127 long port; 128 char *ep; 129 130 if (str == NULL) { 131 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_NO_PORT_SPECIFIED); 132 return (0); 133 } 134 135 errno = 0; 136 port = strtol(str, &ep, 10); 137 if (str[0] != '\0' && *ep == '\0') { 138 if (errno == ERANGE && (port == LONG_MAX || port == LONG_MIN)) { 139 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER); 140 return (0); 141 } 142 if (port < 0 || port > 65535) { 143 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER); 144 return (0); 145 } 146 goto done; 147 } 148 149 if (getaddrinfo(NULL, str, &hints, &res) == 0) { 150 port = ntohs(((struct sockaddr_in *)(res->ai_addr))->sin_port); 151 goto done; 152 } 153 154 if (strcmp(str, "http") == 0) 155 port = 80; 156 else if (strcmp(str, "telnet") == 0) 157 port = 23; 158 else if (strcmp(str, "socks") == 0) 159 port = 1080; 160 else if (strcmp(str, "https") == 0) 161 port = 443; 162 else if (strcmp(str, "ssl") == 0) 163 port = 443; 164 else if (strcmp(str, "ftp") == 0) 165 port = 21; 166 else if (strcmp(str, "gopher") == 0) 167 port = 70; 168 else { 169 SYSerr(SYS_F_GETSERVBYNAME, errno); 170 ERR_asprintf_error_data("service='%s'", str); 171 return (0); 172 } 173 174 done: 175 if (res) 176 freeaddrinfo(res); 177 *port_ptr = (unsigned short)port; 178 return (1); 179 } 180 181 int 182 BIO_sock_error(int sock) 183 { 184 socklen_t len; 185 int err; 186 187 len = sizeof(err); 188 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &len) != 0) 189 return (1); 190 return (err); 191 } 192 193 struct hostent * 194 BIO_gethostbyname(const char *name) 195 { 196 return gethostbyname(name); 197 } 198 199 int 200 BIO_sock_init(void) 201 { 202 return (1); 203 } 204 205 void 206 BIO_sock_cleanup(void) 207 { 208 } 209 210 int 211 BIO_socket_ioctl(int fd, long type, void *arg) 212 { 213 int ret; 214 215 ret = ioctl(fd, type, arg); 216 if (ret < 0) 217 SYSerr(SYS_F_IOCTLSOCKET, errno); 218 return (ret); 219 } 220 221 int 222 BIO_get_accept_socket(char *host, int bind_mode) 223 { 224 int ret = 0; 225 union { 226 struct sockaddr sa; 227 struct sockaddr_in sa_in; 228 struct sockaddr_in6 sa_in6; 229 } server, client; 230 int s = -1, cs, addrlen; 231 unsigned char ip[4]; 232 unsigned short port; 233 char *str = NULL, *e; 234 char *h, *p; 235 unsigned long l; 236 int err_num; 237 238 if ((str = BUF_strdup(host)) == NULL) 239 return (-1); 240 241 h = p = NULL; 242 h = str; 243 for (e = str; *e; e++) { 244 if (*e == ':') { 245 p = e; 246 } else if (*e == '/') { 247 *e = '\0'; 248 break; 249 } 250 } 251 /* points at last ':', '::port' is special [see below] */ 252 if (p) 253 *p++ = '\0'; 254 else 255 p = h, h = NULL; 256 257 do { 258 struct addrinfo *res, hint; 259 260 /* 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 */ 266 memset(&hint, 0, sizeof(hint)); 267 hint.ai_flags = AI_PASSIVE; 268 if (h) { 269 if (strchr(h, ':')) { 270 if (h[1] == '\0') 271 h = NULL; 272 hint.ai_family = AF_INET6; 273 } else if (h[0] == '*' && h[1] == '\0') { 274 hint.ai_family = AF_INET; 275 h = NULL; 276 } 277 } 278 279 if (getaddrinfo(h, p, &hint, &res)) 280 break; 281 282 addrlen = res->ai_addrlen <= sizeof(server) ? 283 res->ai_addrlen : sizeof(server); 284 memcpy(&server, res->ai_addr, addrlen); 285 286 freeaddrinfo(res); 287 goto again; 288 } while (0); 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, 316 BIO_R_UNABLE_TO_CREATE_SOCKET); 317 goto err; 318 } 319 320 if (bind_mode == BIO_BIND_REUSEADDR) { 321 int i = 1; 322 323 ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&i, 324 sizeof(i)); 325 bind_mode = BIO_BIND_NORMAL; 326 } 327 if (bind(s, &server.sa, addrlen) == -1) { 328 err_num = errno; 329 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) && 330 (err_num == EADDRINUSE)) { 331 client = server; 332 if (h == NULL || strcmp(h, "*") == 0) { 333 if (client.sa.sa_family == AF_INET6) { 334 memset(&client.sa_in6.sin6_addr, 0, 335 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 = 339 htonl(0x7F000001); 340 } else 341 goto err; 342 } 343 cs = socket(client.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 344 if (cs != -1) { 345 int ii; 346 ii = connect(cs, &client.sa, addrlen); 347 close(cs); 348 if (ii == -1) { 349 bind_mode = BIO_BIND_REUSEADDR; 350 close(s); 351 goto again; 352 } 353 /* else error */ 354 } 355 /* else error */ 356 } 357 SYSerr(SYS_F_BIND, err_num); 358 ERR_asprintf_error_data("port='%s'", host); 359 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, 360 BIO_R_UNABLE_TO_BIND_SOCKET); 361 goto err; 362 } 363 if (listen(s, SOMAXCONN) == -1) { 364 SYSerr(SYS_F_BIND, errno); 365 ERR_asprintf_error_data("port='%s'", host); 366 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, 367 BIO_R_UNABLE_TO_LISTEN_SOCKET); 368 goto err; 369 } 370 ret = 1; 371 err: 372 free(str); 373 if ((ret == 0) && (s != -1)) { 374 close(s); 375 s = -1; 376 } 377 return (s); 378 } 379 380 int 381 BIO_accept(int sock, char **addr) 382 { 383 int ret = -1; 384 unsigned long l; 385 unsigned short port; 386 char *p, *tmp; 387 388 struct { 389 socklen_t len; 390 union { 391 struct sockaddr sa; 392 struct sockaddr_in sa_in; 393 struct sockaddr_in6 sa_in6; 394 } from; 395 } sa; 396 397 sa.len = sizeof(sa.from); 398 memset(&sa.from, 0, sizeof(sa.from)); 399 ret = accept(sock, &sa.from.sa, &sa.len); 400 if (ret == -1) { 401 if (BIO_sock_should_retry(ret)) 402 return -2; 403 SYSerr(SYS_F_ACCEPT, errno); 404 BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR); 405 goto end; 406 } 407 408 if (addr == NULL) 409 goto end; 410 411 do { 412 char h[NI_MAXHOST], s[NI_MAXSERV]; 413 size_t nl; 414 415 if (getnameinfo(&sa.from.sa, sa.len, h, sizeof(h), 416 s, sizeof(s), NI_NUMERICHOST|NI_NUMERICSERV)) 417 break; 418 nl = strlen(h) + strlen(s) + 2; 419 p = *addr; 420 if (p) { 421 *p = '\0'; 422 if (!(tmp = realloc(p, nl))) { 423 close(ret); 424 ret = -1; 425 free(p); 426 *addr = NULL; 427 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 428 goto end; 429 } 430 p = tmp; 431 } else { 432 p = malloc(nl); 433 } 434 if (p == NULL) { 435 close(ret); 436 ret = -1; 437 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 438 goto end; 439 } 440 *addr = p; 441 snprintf(*addr, nl, "%s:%s", h, s); 442 goto end; 443 } while (0); 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 return (BIO_socket_ioctl(s, FIONBIO, &mode) == 0); 475 } 476