crypto/libressl/crypto/bio/b_sock.c

   1 /* $OpenBSD: b_sock.c,v 1.60 2014/12/03 21:55:51 bcook 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         if (he->h_addrtype != AF_INET) {
  97                 BIOerr(BIO_F_BIO_GET_HOST_IP,
  98                     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         CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
 107         if (err) {
 108                 ERR_asprintf_error_data("host=%s", str);
 109                 return 0;
 110         } else
 111                 return 1;
 112 }
 113
 114 int
 115 BIO_get_port(const char *str, unsigned short *port_ptr)
 116 {
 117         struct addrinfo *res = NULL;
 118         struct addrinfo hints = {
 119                 .ai_family = AF_UNSPEC,
 120                 .ai_socktype = SOCK_STREAM,
 121                 .ai_flags = AI_PASSIVE,
 122         };
 123         long port;
 124         char *ep;
 125
 126         if (str == NULL) {
 127                 BIOerr(BIO_F_BIO_GET_PORT, BIO_R_NO_PORT_SPECIFIED);
 128                 return (0);
 129         }
 130
 131         errno = 0;
 132         port = strtol(str, &ep, 10);
 133         if (str[0] != '\0' && *ep == '\0') {
 134                 if (errno == ERANGE && (port == LONG_MAX || port == LONG_MIN)) {
 135                         BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER);
 136                         return (0);
 137                 }
 138                 if (port < 0 || port > 65535) {
 139                         BIOerr(BIO_F_BIO_GET_PORT, BIO_R_INVALID_PORT_NUMBER);
 140                         return (0);
 141                 }
 142                 goto done;
 143         }
 144
 145         if (getaddrinfo(NULL, str, &hints, &res) == 0) {
 146                 port = ntohs(((struct sockaddr_in *)(res->ai_addr))->sin_port);
 147                 goto done;
 148         }
 149
 150         if (strcmp(str, "http") == 0)
 151                 port = 80;
 152         else if (strcmp(str, "telnet") == 0)
 153                 port = 23;
 154         else if (strcmp(str, "socks") == 0)
 155                 port = 1080;
 156         else if (strcmp(str, "https") == 0)
 157                 port = 443;
 158         else if (strcmp(str, "ssl") == 0)
 159                 port = 443;
 160         else if (strcmp(str, "ftp") == 0)
 161                 port = 21;
 162         else if (strcmp(str, "gopher") == 0)
 163                 port = 70;
 164         else {
 165                 SYSerr(SYS_F_GETSERVBYNAME, errno);
 166                 ERR_asprintf_error_data("service='%s'", str);
 167                 return (0);
 168         }
 169
 170 done:
 171         if (res)
 172                 freeaddrinfo(res);
 173         *port_ptr = (unsigned short)port;
 174         return (1);
 175 }
 176
 177 int
 178 BIO_sock_error(int sock)
 179 {
 180         socklen_t len;
 181         int err;
 182
 183         len = sizeof(err);
 184         if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &len) != 0)
 185                 return (1);
 186         return (err);
 187 }
 188
 189 struct hostent *
 190 BIO_gethostbyname(const char *name)
 191 {
 192         return gethostbyname(name);
 193 }
 194
 195 int
 196 BIO_socket_ioctl(int fd, long type, void *arg)
 197 {
 198         int ret;
 199
 200         ret = ioctl(fd, type, arg);
 201         if (ret < 0)
 202                 SYSerr(SYS_F_IOCTLSOCKET, errno);
 203         return (ret);
 204 }
 205
 206 int
 207 BIO_get_accept_socket(char *host, int bind_mode)
 208 {
 209         int ret = 0;
 210         union {
 211                 struct sockaddr sa;
 212                 struct sockaddr_in sa_in;
 213                 struct sockaddr_in6 sa_in6;
 214         } server, client;
 215         int s = -1, cs, addrlen;
 216         unsigned char ip[4];
 217         unsigned short port;
 218         char *str = NULL, *e;
 219         char *h, *p;
 220         unsigned long l;
 221         int err_num;
 222
 223         if (host == NULL || (str = strdup(host)) == NULL)
 224                 return (-1);
 225
 226         h = p = NULL;
 227         h = str;
 228         for (e = str; *e; e++) {
 229                 if (*e == ':') {
 230                         p = e;
 231                 } else if (*e == '/') {
 232                         *e = '\0';
 233                         break;
 234                 }
 235         }
 236         /* points at last ':', '::port' is special [see below] */
 237         if (p)
 238                 *p++ = '\0';
 239         else
 240                 p = h, h = NULL;
 241
 242         do {
 243                 struct addrinfo *res, hint;
 244
 245                 /*
 246                  * '::port' enforces IPv6 wildcard listener. Some OSes,
 247                  * e.g. Solaris, default to IPv6 without any hint. Also
 248                  * note that commonly IPv6 wildchard socket can service
 249                  * IPv4 connections just as well...
 250                  */
 251                 memset(&hint, 0, sizeof(hint));
 252                 hint.ai_flags = AI_PASSIVE;
 253                 if (h) {
 254                         if (strchr(h, ':')) {
 255                                 if (h[1] == '\0')
 256                                         h = NULL;
 257                                 hint.ai_family = AF_INET6;
 258                         } else if (h[0] == '*' && h[1] == '\0') {
 259                                 hint.ai_family = AF_INET;
 260                                 h = NULL;
 261                         }
 262                 }
 263
 264                 if (getaddrinfo(h, p, &hint, &res))
 265                         break;
 266
 267                 addrlen = res->ai_addrlen <= sizeof(server) ?
 268                     res->ai_addrlen : sizeof(server);
 269                 memcpy(&server, res->ai_addr, addrlen);
 270
 271                 freeaddrinfo(res);
 272                 goto again;
 273         } while (0);
 274
 275         if (!BIO_get_port(p, &port))
 276                 goto err;
 277
 278         memset((char *)&server, 0, sizeof(server));
 279         server.sa_in.sin_family = AF_INET;
 280         server.sa_in.sin_port = htons(port);
 281         addrlen = sizeof(server.sa_in);
 282
 283         if (h == NULL || strcmp(h, "*") == 0)
 284                 server.sa_in.sin_addr.s_addr = INADDR_ANY;
 285         else {
 286                 if (!BIO_get_host_ip(h, &(ip[0])))
 287                         goto err;
 288                 l = (unsigned long)((unsigned long)ip[0]<<24L)|
 289                     ((unsigned long)ip[1]<<16L)|
 290                     ((unsigned long)ip[2]<< 8L)|
 291                     ((unsigned long)ip[3]);
 292                 server.sa_in.sin_addr.s_addr = htonl(l);
 293         }
 294
 295 again:
 296         s = socket(server.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 297         if (s == -1) {
 298                 SYSerr(SYS_F_SOCKET, errno);
 299                 ERR_asprintf_error_data("port='%s'", host);
 300                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,
 301                     BIO_R_UNABLE_TO_CREATE_SOCKET);
 302                 goto err;
 303         }
 304
 305         if (bind_mode == BIO_BIND_REUSEADDR) {
 306                 int i = 1;
 307
 308                 ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 309                 bind_mode = BIO_BIND_NORMAL;
 310         }
 311         if (bind(s, &server.sa, addrlen) == -1) {
 312                 err_num = errno;
 313                 if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
 314                     (err_num == EADDRINUSE)) {
 315                         client = server;
 316                         if (h == NULL || strcmp(h, "*") == 0) {
 317                                 if (client.sa.sa_family == AF_INET6) {
 318                                         memset(&client.sa_in6.sin6_addr, 0,
 319                                             sizeof(client.sa_in6.sin6_addr));
 320                                         client.sa_in6.sin6_addr.s6_addr[15] = 1;
 321                                 } else if (client.sa.sa_family == AF_INET) {
 322                                         client.sa_in.sin_addr.s_addr =
 323                                             htonl(0x7F000001);
 324                                 } else
 325                                         goto err;
 326                         }
 327                         cs = socket(client.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 328                         if (cs != -1) {
 329                                 int ii;
 330                                 ii = connect(cs, &client.sa, addrlen);
 331                                 close(cs);
 332                                 if (ii == -1) {
 333                                         bind_mode = BIO_BIND_REUSEADDR;
 334                                         close(s);
 335                                         goto again;
 336                                 }
 337                                 /* else error */
 338                         }
 339                         /* else error */
 340                 }
 341                 SYSerr(SYS_F_BIND, err_num);
 342                 ERR_asprintf_error_data("port='%s'", host);
 343                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,
 344                     BIO_R_UNABLE_TO_BIND_SOCKET);
 345                 goto err;
 346         }
 347         if (listen(s, SOMAXCONN) == -1) {
 348                 SYSerr(SYS_F_BIND, errno);
 349                 ERR_asprintf_error_data("port='%s'", host);
 350                 BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET,
 351                     BIO_R_UNABLE_TO_LISTEN_SOCKET);
 352                 goto err;
 353         }
 354         ret = 1;
 355 err:
 356         free(str);
 357         if ((ret == 0) && (s != -1)) {
 358                 close(s);
 359                 s = -1;
 360         }
 361         return (s);
 362 }
 363
 364 int
 365 BIO_accept(int sock, char **addr)
 366 {
 367         int ret = -1;
 368         unsigned long l;
 369         unsigned short port;
 370         char *p, *tmp;
 371
 372         struct {
 373                 socklen_t len;
 374                 union {
 375                         struct sockaddr sa;
 376                         struct sockaddr_in sa_in;
 377                         struct sockaddr_in6 sa_in6;
 378                 } from;
 379         } sa;
 380
 381         sa.len = sizeof(sa.from);
 382         memset(&sa.from, 0, sizeof(sa.from));
 383         ret = accept(sock, &sa.from.sa, &sa.len);
 384         if (ret == -1) {
 385                 if (BIO_sock_should_retry(ret))
 386                         return -2;
 387                 SYSerr(SYS_F_ACCEPT, errno);
 388                 BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR);
 389                 goto end;
 390         }
 391
 392         if (addr == NULL)
 393                 goto end;
 394
 395         do {
 396                 char   h[NI_MAXHOST], s[NI_MAXSERV];
 397                 size_t nl;
 398
 399                 if (getnameinfo(&sa.from.sa, sa.len, h, sizeof(h),
 400                     s, sizeof(s), NI_NUMERICHOST|NI_NUMERICSERV))
 401                         break;
 402                 nl = strlen(h) + strlen(s) + 2;
 403                 p = *addr;
 404                 if (p)
 405                         *p = '\0';
 406                 if (!(tmp = realloc(p, nl))) {
 407                         close(ret);
 408                         ret = -1;
 409                         free(p);
 410                         *addr = NULL;
 411                         BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE);
 412                         goto end;
 413                 }
 414                 p = tmp;
 415                 *addr = p;
 416                 snprintf(*addr, nl, "%s:%s", h, s);
 417                 goto end;
 418         } while (0);
 419         if (sa.from.sa.sa_family != AF_INET)
 420                 goto end;
 421         l = ntohl(sa.from.sa_in.sin_addr.s_addr);
 422         port = ntohs(sa.from.sa_in.sin_port);
 423         if (*addr == NULL) {
 424                 if ((p = malloc(24)) == 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         }
 432         snprintf(*addr, 24, "%d.%d.%d.%d:%d",
 433             (unsigned char)(l >> 24L) & 0xff, (unsigned char)(l >> 16L) & 0xff,
 434             (unsigned char)(l >> 8L) & 0xff, (unsigned char)(l) & 0xff, port);
 435
 436 end:
 437         return (ret);
 438 }
 439
 440 int
 441 BIO_set_tcp_ndelay(int s, int on)
 442 {
 443         return (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == 0);
 444 }