1 /* $OpenBSD: b_sock.c,v 1.56 2014/07/16 10:43:06 deraadt 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 #include <openssl/buffer.h> 76 #include <openssl/err.h> 77 78 int 79 BIO_get_host_ip(const char *str, unsigned char *ip) 80 { 81 int i; 82 int err = 1; 83 struct hostent *he; 84 85 if (inet_pton(AF_INET, str, ip) == 1) 86 return (1); 87 88 /* do a gethostbyname */ 89 CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME); 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, 99 BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET); 100 goto err; 101 } 102 for (i = 0; i < 4; i++) 103 ip[i] = he->h_addr_list[0][i]; 104 err = 0; 105 106 err: 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 addrinfo *res = NULL; 119 struct addrinfo hints = { 120 .ai_family = AF_UNSPEC, 121 .ai_socktype = SOCK_STREAM, 122 .ai_flags = AI_PASSIVE, 123 }; 124 long port; 125 char *ep; 126 127 if (str == NULL) { 128 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_NO_PORT_SPECIFIED); 129 return (0); 130 } 131 132 errno = 0; 133 port = strtol(str, &ep, 10); 134 if (str[0] != '\0' && *ep == '\0') { 135 if (errno == ERANGE && (port == LONG_MAX || port == LONG_MIN)) { 136 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER); 137 return (0); 138 } 139 if (port < 0 || port > 65535) { 140 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER); 141 return (0); 142 } 143 goto done; 144 } 145 146 if (getaddrinfo(NULL, str, &hints, &res) == 0) { 147 port = ntohs(((struct sockaddr_in *)(res->ai_addr))->sin_port); 148 goto done; 149 } 150 151 if (strcmp(str, "http") == 0) 152 port = 80; 153 else if (strcmp(str, "telnet") == 0) 154 port = 23; 155 else if (strcmp(str, "socks") == 0) 156 port = 1080; 157 else if (strcmp(str, "https") == 0) 158 port = 443; 159 else if (strcmp(str, "ssl") == 0) 160 port = 443; 161 else if (strcmp(str, "ftp") == 0) 162 port = 21; 163 else if (strcmp(str, "gopher") == 0) 164 port = 70; 165 else { 166 SYSerr(SYS_F_GETSERVBYNAME, errno); 167 ERR_asprintf_error_data("service='%s'", str); 168 return (0); 169 } 170 171 done: 172 if (res) 173 freeaddrinfo(res); 174 *port_ptr = (unsigned short)port; 175 return (1); 176 } 177 178 int 179 BIO_sock_error(int sock) 180 { 181 socklen_t len; 182 int err; 183 184 len = sizeof(err); 185 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &len) != 0) 186 return (1); 187 return (err); 188 } 189 190 struct hostent * 191 BIO_gethostbyname(const char *name) 192 { 193 return gethostbyname(name); 194 } 195 196 int 197 BIO_sock_init(void) 198 { 199 return (1); 200 } 201 202 void 203 BIO_sock_cleanup(void) 204 { 205 } 206 207 int 208 BIO_socket_ioctl(int fd, long type, void *arg) 209 { 210 int ret; 211 212 ret = ioctl(fd, type, arg); 213 if (ret < 0) 214 SYSerr(SYS_F_IOCTLSOCKET, errno); 215 return (ret); 216 } 217 218 int 219 BIO_get_accept_socket(char *host, int bind_mode) 220 { 221 int ret = 0; 222 union { 223 struct sockaddr sa; 224 struct sockaddr_in sa_in; 225 struct sockaddr_in6 sa_in6; 226 } server, client; 227 int s = -1, cs, addrlen; 228 unsigned char ip[4]; 229 unsigned short port; 230 char *str = NULL, *e; 231 char *h, *p; 232 unsigned long l; 233 int err_num; 234 235 if (host == NULL || (str = strdup(host)) == NULL) 236 return (-1); 237 238 h = p = NULL; 239 h = str; 240 for (e = str; *e; e++) { 241 if (*e == ':') { 242 p = e; 243 } else if (*e == '/') { 244 *e = '\0'; 245 break; 246 } 247 } 248 /* points at last ':', '::port' is special [see below] */ 249 if (p) 250 *p++ = '\0'; 251 else 252 p = h, h = NULL; 253 254 do { 255 struct addrinfo *res, hint; 256 257 /* 258 * '::port' enforces IPv6 wildcard listener. Some OSes, 259 * e.g. Solaris, default to IPv6 without any hint. Also 260 * note that commonly IPv6 wildchard socket can service 261 * IPv4 connections just as well... 262 */ 263 memset(&hint, 0, sizeof(hint)); 264 hint.ai_flags = AI_PASSIVE; 265 if (h) { 266 if (strchr(h, ':')) { 267 if (h[1] == '\0') 268 h = NULL; 269 hint.ai_family = AF_INET6; 270 } else if (h[0] == '*' && h[1] == '\0') { 271 hint.ai_family = AF_INET; 272 h = NULL; 273 } 274 } 275 276 if (getaddrinfo(h, p, &hint, &res)) 277 break; 278 279 addrlen = res->ai_addrlen <= sizeof(server) ? 280 res->ai_addrlen : sizeof(server); 281 memcpy(&server, res->ai_addr, addrlen); 282 283 freeaddrinfo(res); 284 goto again; 285 } while (0); 286 287 if (!BIO_get_port(p, &port)) 288 goto err; 289 290 memset((char *)&server, 0, sizeof(server)); 291 server.sa_in.sin_family = AF_INET; 292 server.sa_in.sin_port = htons(port); 293 addrlen = sizeof(server.sa_in); 294 295 if (h == NULL || strcmp(h, "*") == 0) 296 server.sa_in.sin_addr.s_addr = INADDR_ANY; 297 else { 298 if (!BIO_get_host_ip(h, &(ip[0]))) 299 goto err; 300 l = (unsigned long)((unsigned long)ip[0]<<24L)| 301 ((unsigned long)ip[1]<<16L)| 302 ((unsigned long)ip[2]<< 8L)| 303 ((unsigned long)ip[3]); 304 server.sa_in.sin_addr.s_addr = htonl(l); 305 } 306 307 again: 308 s = socket(server.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 309 if (s == -1) { 310 SYSerr(SYS_F_SOCKET, errno); 311 ERR_asprintf_error_data("port='%s'", host); 312 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, 313 BIO_R_UNABLE_TO_CREATE_SOCKET); 314 goto err; 315 } 316 317 if (bind_mode == BIO_BIND_REUSEADDR) { 318 int i = 1; 319 320 ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&i, 321 sizeof(i)); 322 bind_mode = BIO_BIND_NORMAL; 323 } 324 if (bind(s, &server.sa, addrlen) == -1) { 325 err_num = errno; 326 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) && 327 (err_num == EADDRINUSE)) { 328 client = server; 329 if (h == NULL || strcmp(h, "*") == 0) { 330 if (client.sa.sa_family == AF_INET6) { 331 memset(&client.sa_in6.sin6_addr, 0, 332 sizeof(client.sa_in6.sin6_addr)); 333 client.sa_in6.sin6_addr.s6_addr[15] = 1; 334 } else if (client.sa.sa_family == AF_INET) { 335 client.sa_in.sin_addr.s_addr = 336 htonl(0x7F000001); 337 } else 338 goto err; 339 } 340 cs = socket(client.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); 341 if (cs != -1) { 342 int ii; 343 ii = connect(cs, &client.sa, addrlen); 344 close(cs); 345 if (ii == -1) { 346 bind_mode = BIO_BIND_REUSEADDR; 347 close(s); 348 goto again; 349 } 350 /* else error */ 351 } 352 /* else error */ 353 } 354 SYSerr(SYS_F_BIND, err_num); 355 ERR_asprintf_error_data("port='%s'", host); 356 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, 357 BIO_R_UNABLE_TO_BIND_SOCKET); 358 goto err; 359 } 360 if (listen(s, SOMAXCONN) == -1) { 361 SYSerr(SYS_F_BIND, errno); 362 ERR_asprintf_error_data("port='%s'", host); 363 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, 364 BIO_R_UNABLE_TO_LISTEN_SOCKET); 365 goto err; 366 } 367 ret = 1; 368 err: 369 free(str); 370 if ((ret == 0) && (s != -1)) { 371 close(s); 372 s = -1; 373 } 374 return (s); 375 } 376 377 int 378 BIO_accept(int sock, char **addr) 379 { 380 int ret = -1; 381 unsigned long l; 382 unsigned short port; 383 char *p, *tmp; 384 385 struct { 386 socklen_t len; 387 union { 388 struct sockaddr sa; 389 struct sockaddr_in sa_in; 390 struct sockaddr_in6 sa_in6; 391 } from; 392 } sa; 393 394 sa.len = sizeof(sa.from); 395 memset(&sa.from, 0, sizeof(sa.from)); 396 ret = accept(sock, &sa.from.sa, &sa.len); 397 if (ret == -1) { 398 if (BIO_sock_should_retry(ret)) 399 return -2; 400 SYSerr(SYS_F_ACCEPT, errno); 401 BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR); 402 goto end; 403 } 404 405 if (addr == NULL) 406 goto end; 407 408 do { 409 char h[NI_MAXHOST], s[NI_MAXSERV]; 410 size_t nl; 411 412 if (getnameinfo(&sa.from.sa, sa.len, h, sizeof(h), 413 s, sizeof(s), NI_NUMERICHOST|NI_NUMERICSERV)) 414 break; 415 nl = strlen(h) + strlen(s) + 2; 416 p = *addr; 417 if (p) 418 *p = '\0'; 419 if (!(tmp = realloc(p, nl))) { 420 close(ret); 421 ret = -1; 422 free(p); 423 *addr = NULL; 424 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 425 goto end; 426 } 427 p = tmp; 428 *addr = p; 429 snprintf(*addr, nl, "%s:%s", h, s); 430 goto end; 431 } while (0); 432 if (sa.from.sa.sa_family != AF_INET) 433 goto end; 434 l = ntohl(sa.from.sa_in.sin_addr.s_addr); 435 port = ntohs(sa.from.sa_in.sin_port); 436 if (*addr == NULL) { 437 if ((p = malloc(24)) == NULL) { 438 close(ret); 439 ret = -1; 440 BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); 441 goto end; 442 } 443 *addr = p; 444 } 445 snprintf(*addr, 24, "%d.%d.%d.%d:%d", 446 (unsigned char)(l >> 24L) & 0xff, (unsigned char)(l >> 16L) & 0xff, 447 (unsigned char)(l >> 8L) & 0xff, (unsigned char)(l) & 0xff, port); 448 449 end: 450 return (ret); 451 } 452 453 int 454 BIO_set_tcp_ndelay(int s, int on) 455 { 456 return (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == 0); 457 } 458 459 int 460 BIO_socket_nbio(int s, int mode) 461 { 462 return (BIO_socket_ioctl(s, FIONBIO, &mode) == 0); 463 } 464