apps/s_socket.c

   1 /*
   2  * apps/s_socket.c - socket-related functions used by s_client and s_server
   3  */
   4 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   5  * All rights reserved.
   6  *
   7  * This package is an SSL implementation written
   8  * by Eric Young (eay@cryptsoft.com).
   9  * The implementation was written so as to conform with Netscapes SSL.
  10  *
  11  * This library is free for commercial and non-commercial use as long as
  12  * the following conditions are aheared to.  The following conditions
  13  * apply to all code found in this distribution, be it the RC4, RSA,
  14  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  15  * included with this distribution is covered by the same copyright terms
  16  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  17  *
  18  * Copyright remains Eric Young's, and as such any Copyright notices in
  19  * the code are not to be removed.
  20  * If this package is used in a product, Eric Young should be given attribution
  21  * as the author of the parts of the library used.
  22  * This can be in the form of a textual message at program startup or
  23  * in documentation (online or textual) provided with the package.
  24  *
  25  * Redistribution and use in source and binary forms, with or without
  26  * modification, are permitted provided that the following conditions
  27  * are met:
  28  * 1. Redistributions of source code must retain the copyright
  29  *    notice, this list of conditions and the following disclaimer.
  30  * 2. Redistributions in binary form must reproduce the above copyright
  31  *    notice, this list of conditions and the following disclaimer in the
  32  *    documentation and/or other materials provided with the distribution.
  33  * 3. All advertising materials mentioning features or use of this software
  34  *    must display the following acknowledgement:
  35  *    "This product includes cryptographic software written by
  36  *     Eric Young (eay@cryptsoft.com)"
  37  *    The word 'cryptographic' can be left out if the rouines from the library
  38  *    being used are not cryptographic related :-).
  39  * 4. If you include any Windows specific code (or a derivative thereof) from
  40  *    the apps directory (application code) you must include an acknowledgement:
  41  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  * The licence and distribution terms for any publically available version or
  56  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  57  * copied and put under another distribution licence
  58  * [including the GNU Public Licence.]
  59  */
  60
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <errno.h>
  65 #include <signal.h>
  66
  67 #ifdef FLAT_INC
  68 # include "e_os2.h"
  69 #else
  70 # include "../e_os2.h"
  71 #endif
  72
  73 /*
  74  * With IPv6, it looks like Digital has mixed up the proper order of
  75  * recursive header file inclusion, resulting in the compiler complaining
  76  * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
  77  * needed to have fileno() declared correctly...  So let's define u_int
  78  */
  79 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
  80 # define __U_INT
  81 typedef unsigned int u_int;
  82 #endif
  83
  84 #define USE_SOCKETS
  85 #define NON_MAIN
  86 #include "apps.h"
  87 #undef USE_SOCKETS
  88 #undef NON_MAIN
  89 #include "s_apps.h"
  90 #include <openssl/ssl.h>
  91
  92 #ifdef FLAT_INC
  93 # include "e_os.h"
  94 #else
  95 # include "../e_os.h"
  96 #endif
  97
  98 #ifndef OPENSSL_NO_SOCK
  99
 100 # if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
 101 #  include "netdb.h"
 102 # endif
 103
 104 static struct hostent *GetHostByName(char *name);
 105 # if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
 106 static void ssl_sock_cleanup(void);
 107 # endif
 108 static int ssl_sock_init(void);
 109 static int init_client_ip(int *sock, unsigned char ip[4], int port, int type);
 110 static int init_server(int *sock, int port, int type);
 111 static int init_server_long(int *sock, int port, char *ip, int type);
 112 static int do_accept(int acc_sock, int *sock, char **host);
 113 static int host_ip(char *str, unsigned char ip[4]);
 114
 115 # ifdef OPENSSL_SYS_WIN16
 116 #  define SOCKET_PROTOCOL 0     /* more microsoft stupidity */
 117 # else
 118 #  define SOCKET_PROTOCOL IPPROTO_TCP
 119 # endif
 120
 121 # if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 122 static int wsa_init_done = 0;
 123 # endif
 124
 125 # ifdef OPENSSL_SYS_WINDOWS
 126 static struct WSAData wsa_state;
 127 static int wsa_init_done = 0;
 128
 129 #  ifdef OPENSSL_SYS_WIN16
 130 static HWND topWnd = 0;
 131 static FARPROC lpTopWndProc = NULL;
 132 static FARPROC lpTopHookProc = NULL;
 133 extern HINSTANCE _hInstance;    /* nice global CRT provides */
 134
 135 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
 136                                    LPARAM lParam)
 137 {
 138     if (hwnd == topWnd) {
 139         switch (message) {
 140         case WM_DESTROY:
 141         case WM_CLOSE:
 142             SetWindowLong(topWnd, GWL_WNDPROC, (LONG) lpTopWndProc);
 143             ssl_sock_cleanup();
 144             break;
 145         }
 146     }
 147     return CallWindowProc(lpTopWndProc, hwnd, message, wParam, lParam);
 148 }
 149
 150 static BOOL CALLBACK enumproc(HWND hwnd, LPARAM lParam)
 151 {
 152     topWnd = hwnd;
 153     return (FALSE);
 154 }
 155
 156 #  endif                        /* OPENSSL_SYS_WIN32 */
 157 # endif                         /* OPENSSL_SYS_WINDOWS */
 158
 159 # ifdef OPENSSL_SYS_WINDOWS
 160 static void ssl_sock_cleanup(void)
 161 {
 162     if (wsa_init_done) {
 163         wsa_init_done = 0;
 164 #  ifndef OPENSSL_SYS_WINCE
 165         WSACancelBlockingCall();
 166 #  endif
 167         WSACleanup();
 168     }
 169 }
 170 # elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 171 static void sock_cleanup(void)
 172 {
 173     if (wsa_init_done) {
 174         wsa_init_done = 0;
 175         WSACleanup();
 176     }
 177 }
 178 # endif
 179
 180 static int ssl_sock_init(void)
 181 {
 182 # ifdef WATT32
 183     extern int _watt_do_exit;
 184     _watt_do_exit = 0;
 185     if (sock_init())
 186         return (0);
 187 # elif defined(OPENSSL_SYS_WINDOWS)
 188     if (!wsa_init_done) {
 189         int err;
 190
 191 #  ifdef SIGINT
 192         signal(SIGINT, (void (*)(int))ssl_sock_cleanup);
 193 #  endif
 194         wsa_init_done = 1;
 195         memset(&wsa_state, 0, sizeof(wsa_state));
 196         if (WSAStartup(0x0101, &wsa_state) != 0) {
 197             err = WSAGetLastError();
 198             BIO_printf(bio_err, "unable to start WINSOCK, error code=%d\n",
 199                        err);
 200             return (0);
 201         }
 202 #  ifdef OPENSSL_SYS_WIN16
 203         EnumTaskWindows(GetCurrentTask(), enumproc, 0L);
 204         lpTopWndProc = (FARPROC) GetWindowLong(topWnd, GWL_WNDPROC);
 205         lpTopHookProc = MakeProcInstance((FARPROC) topHookProc, _hInstance);
 206
 207         SetWindowLong(topWnd, GWL_WNDPROC, (LONG) lpTopHookProc);
 208 #  endif                        /* OPENSSL_SYS_WIN16 */
 209     }
 210 # elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 211     WORD wVerReq;
 212     WSADATA wsaData;
 213     int err;
 214
 215     if (!wsa_init_done) {
 216
 217 #  ifdef SIGINT
 218         signal(SIGINT, (void (*)(int))sock_cleanup);
 219 #  endif
 220
 221         wsa_init_done = 1;
 222         wVerReq = MAKEWORD(2, 0);
 223         err = WSAStartup(wVerReq, &wsaData);
 224         if (err != 0) {
 225             BIO_printf(bio_err, "unable to start WINSOCK2, error code=%d\n",
 226                        err);
 227             return (0);
 228         }
 229     }
 230 # endif                         /* OPENSSL_SYS_WINDOWS */
 231     return (1);
 232 }
 233
 234 int init_client(int *sock, char *host, int port, int type)
 235 {
 236     unsigned char ip[4];
 237     short p = 0;
 238
 239     if (!host_ip(host, &(ip[0]))) {
 240         return (0);
 241     }
 242     if (p != 0)
 243         port = p;
 244     return (init_client_ip(sock, ip, port, type));
 245 }
 246
 247 static int init_client_ip(int *sock, unsigned char ip[4], int port, int type)
 248 {
 249     unsigned long addr;
 250     struct sockaddr_in them;
 251     int s, i;
 252
 253     if (!ssl_sock_init())
 254         return (0);
 255
 256     memset((char *)&them, 0, sizeof(them));
 257     them.sin_family = AF_INET;
 258     them.sin_port = htons((unsigned short)port);
 259     addr = (unsigned long)
 260         ((unsigned long)ip[0] << 24L) |
 261         ((unsigned long)ip[1] << 16L) |
 262         ((unsigned long)ip[2] << 8L) | ((unsigned long)ip[3]);
 263     them.sin_addr.s_addr = htonl(addr);
 264
 265     if (type == SOCK_STREAM)
 266         s = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
 267     else                        /* ( type == SOCK_DGRAM) */
 268         s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 269
 270     if (s == INVALID_SOCKET) {
 271         perror("socket");
 272         return (0);
 273     }
 274 # ifndef OPENSSL_SYS_MPE
 275     if (type == SOCK_STREAM) {
 276         i = 0;
 277         i = setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, sizeof(i));
 278         if (i < 0) {
 279             perror("keepalive");
 280             return (0);
 281         }
 282     }
 283 # endif
 284
 285     if (connect(s, (struct sockaddr *)&them, sizeof(them)) == -1) {
 286         close(s);
 287         perror("connect");
 288         return (0);
 289     }
 290     *sock = s;
 291     return (1);
 292 }
 293
 294 int do_server(int port, int type, int *ret,
 295               int (*cb) (char *hostname, int s, unsigned char *context),
 296               unsigned char *context)
 297 {
 298     int sock;
 299     char *name = NULL;
 300     int accept_socket;
 301     int i;
 302
 303     if (!init_server(&accept_socket, port, type))
 304         return (0);
 305
 306     if (ret != NULL) {
 307         *ret = accept_socket;
 308         /* return(1); */
 309     }
 310     for (;;) {
 311         if (type == SOCK_STREAM) {
 312             if (do_accept(accept_socket, &sock, &name) == 0) {
 313                 SHUTDOWN(accept_socket);
 314                 return (0);
 315             }
 316         } else
 317             sock = accept_socket;
 318         i = (*cb) (name, sock, context);
 319         if (name != NULL)
 320             OPENSSL_free(name);
 321         if (type == SOCK_STREAM)
 322             SHUTDOWN2(sock);
 323         if (i < 0) {
 324             SHUTDOWN2(accept_socket);
 325             return (i);
 326         }
 327     }
 328 }
 329
 330 static int init_server_long(int *sock, int port, char *ip, int type)
 331 {
 332     int ret = 0;
 333     struct sockaddr_in server;
 334     int s = -1;
 335
 336     if (!ssl_sock_init())
 337         return (0);
 338
 339     memset((char *)&server, 0, sizeof(server));
 340     server.sin_family = AF_INET;
 341     server.sin_port = htons((unsigned short)port);
 342     if (ip == NULL)
 343         server.sin_addr.s_addr = INADDR_ANY;
 344     else
 345 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 346 # ifndef BIT_FIELD_LIMITS
 347         memcpy(&server.sin_addr.s_addr, ip, 4);
 348 # else
 349         memcpy(&server.sin_addr, ip, 4);
 350 # endif
 351
 352     if (type == SOCK_STREAM)
 353         s = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
 354     else                        /* type == SOCK_DGRAM */
 355         s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 356
 357     if (s == INVALID_SOCKET)
 358         goto err;
 359 # if defined SOL_SOCKET && defined SO_REUSEADDR
 360     {
 361         int j = 1;
 362         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void *)&j, sizeof j);
 363     }
 364 # endif
 365     if (bind(s, (struct sockaddr *)&server, sizeof(server)) == -1) {
 366 # ifndef OPENSSL_SYS_WINDOWS
 367         perror("bind");
 368 # endif
 369         goto err;
 370     }
 371     /* Make it 128 for linux */
 372     if (type == SOCK_STREAM && listen(s, 128) == -1)
 373         goto err;
 374     *sock = s;
 375     ret = 1;
 376  err:
 377     if ((ret == 0) && (s != -1)) {
 378         SHUTDOWN(s);
 379     }
 380     return (ret);
 381 }
 382
 383 static int init_server(int *sock, int port, int type)
 384 {
 385     return (init_server_long(sock, port, NULL, type));
 386 }
 387
 388 static int do_accept(int acc_sock, int *sock, char **host)
 389 {
 390     int ret;
 391     struct hostent *h1, *h2;
 392     static struct sockaddr_in from;
 393     int len;
 394 /*      struct linger ling; */
 395
 396     if (!ssl_sock_init())
 397         return (0);
 398
 399 # ifndef OPENSSL_SYS_WINDOWS
 400  redoit:
 401 # endif
 402
 403     memset((char *)&from, 0, sizeof(from));
 404     len = sizeof(from);
 405     /*
 406      * Note: under VMS with SOCKETSHR the fourth parameter is currently of
 407      * type (int *) whereas under other systems it is (void *) if you don't
 408      * have a cast it will choke the compiler: if you do have a cast then you
 409      * can either go for (int *) or (void *).
 410      */
 411     ret = accept(acc_sock, (struct sockaddr *)&from, (void *)&len);
 412     if (ret == INVALID_SOCKET) {
 413 # if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
 414         int i;
 415         i = WSAGetLastError();
 416         BIO_printf(bio_err, "accept error %d\n", i);
 417 # else
 418         if (errno == EINTR) {
 419             /*
 420              * check_timeout();
 421              */
 422             goto redoit;
 423         }
 424         fprintf(stderr, "errno=%d ", errno);
 425         perror("accept");
 426 # endif
 427         return (0);
 428     }
 429
 430 /*-
 431         ling.l_onoff=1;
 432         ling.l_linger=0;
 433         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 434         if (i < 0) { perror("linger"); return(0); }
 435         i=0;
 436         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 437         if (i < 0) { perror("keepalive"); return(0); }
 438 */
 439
 440     if (host == NULL)
 441         goto end;
 442 # ifndef BIT_FIELD_LIMITS
 443     /* I should use WSAAsyncGetHostByName() under windows */
 444     h1 = gethostbyaddr((char *)&from.sin_addr.s_addr,
 445                        sizeof(from.sin_addr.s_addr), AF_INET);
 446 # else
 447     h1 = gethostbyaddr((char *)&from.sin_addr,
 448                        sizeof(struct in_addr), AF_INET);
 449 # endif
 450     if (h1 == NULL) {
 451         BIO_printf(bio_err, "bad gethostbyaddr\n");
 452         *host = NULL;
 453         /* return(0); */
 454     } else {
 455         if ((*host = (char *)OPENSSL_malloc(strlen(h1->h_name) + 1)) == NULL) {
 456             perror("OPENSSL_malloc");
 457             return (0);
 458         }
 459         BUF_strlcpy(*host, h1->h_name, strlen(h1->h_name) + 1);
 460
 461         h2 = GetHostByName(*host);
 462         if (h2 == NULL) {
 463             BIO_printf(bio_err, "gethostbyname failure\n");
 464             return (0);
 465         }
 466         if (h2->h_addrtype != AF_INET) {
 467             BIO_printf(bio_err, "gethostbyname addr is not AF_INET\n");
 468             return (0);
 469         }
 470     }
 471  end:
 472     *sock = ret;
 473     return (1);
 474 }
 475
 476 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 477                       short *port_ptr)
 478 {
 479     char *h, *p;
 480
 481     h = str;
 482     p = strchr(str, ':');
 483     if (p == NULL) {
 484         BIO_printf(bio_err, "no port defined\n");
 485         return (0);
 486     }
 487     *(p++) = '\0';
 488
 489     if ((ip != NULL) && !host_ip(str, ip))
 490         goto err;
 491     if (host_ptr != NULL)
 492         *host_ptr = h;
 493
 494     if (!extract_port(p, port_ptr))
 495         goto err;
 496     return (1);
 497  err:
 498     return (0);
 499 }
 500
 501 static int host_ip(char *str, unsigned char ip[4])
 502 {
 503     unsigned int in[4];
 504     int i;
 505
 506     if (sscanf(str, "%u.%u.%u.%u", &(in[0]), &(in[1]), &(in[2]), &(in[3])) ==
 507         4) {
 508         for (i = 0; i < 4; i++)
 509             if (in[i] > 255) {
 510                 BIO_printf(bio_err, "invalid IP address\n");
 511                 goto err;
 512             }
 513         ip[0] = in[0];
 514         ip[1] = in[1];
 515         ip[2] = in[2];
 516         ip[3] = in[3];
 517     } else {                    /* do a gethostbyname */
 518         struct hostent *he;
 519
 520         if (!ssl_sock_init())
 521             return (0);
 522
 523         he = GetHostByName(str);
 524         if (he == NULL) {
 525             BIO_printf(bio_err, "gethostbyname failure\n");
 526             goto err;
 527         }
 528         /* cast to short because of win16 winsock definition */
 529         if ((short)he->h_addrtype != AF_INET) {
 530             BIO_printf(bio_err, "gethostbyname addr is not AF_INET\n");
 531             return (0);
 532         }
 533         ip[0] = he->h_addr_list[0][0];
 534         ip[1] = he->h_addr_list[0][1];
 535         ip[2] = he->h_addr_list[0][2];
 536         ip[3] = he->h_addr_list[0][3];
 537     }
 538     return (1);
 539  err:
 540     return (0);
 541 }
 542
 543 int extract_port(char *str, short *port_ptr)
 544 {
 545     int i;
 546     struct servent *s;
 547
 548     i = atoi(str);
 549     if (i != 0)
 550         *port_ptr = (unsigned short)i;
 551     else {
 552         s = getservbyname(str, "tcp");
 553         if (s == NULL) {
 554             BIO_printf(bio_err, "getservbyname failure for %s\n", str);
 555             return (0);
 556         }
 557         *port_ptr = ntohs((unsigned short)s->s_port);
 558     }
 559     return (1);
 560 }
 561
 562 # define GHBN_NUM        4
 563 static struct ghbn_cache_st {
 564     char name[128];
 565     struct hostent ent;
 566     unsigned long order;
 567 } ghbn_cache[GHBN_NUM];
 568
 569 static unsigned long ghbn_hits = 0L;
 570 static unsigned long ghbn_miss = 0L;
 571
 572 static struct hostent *GetHostByName(char *name)
 573 {
 574     struct hostent *ret;
 575     int i, lowi = 0;
 576     unsigned long low = (unsigned long)-1;
 577
 578     for (i = 0; i < GHBN_NUM; i++) {
 579         if (low > ghbn_cache[i].order) {
 580             low = ghbn_cache[i].order;
 581             lowi = i;
 582         }
 583         if (ghbn_cache[i].order > 0) {
 584             if (strncmp(name, ghbn_cache[i].name, 128) == 0)
 585                 break;
 586         }
 587     }
 588     if (i == GHBN_NUM) {        /* no hit */
 589         ghbn_miss++;
 590         ret = gethostbyname(name);
 591         if (ret == NULL)
 592             return (NULL);
 593         /* else add to cache */
 594         if (strlen(name) < sizeof ghbn_cache[0].name) {
 595             strcpy(ghbn_cache[lowi].name, name);
 596             memcpy((char *)&(ghbn_cache[lowi].ent), ret,
 597                    sizeof(struct hostent));
 598             ghbn_cache[lowi].order = ghbn_miss + ghbn_hits;
 599         }
 600         return (ret);
 601     } else {
 602         ghbn_hits++;
 603         ret = &(ghbn_cache[i].ent);
 604         ghbn_cache[i].order = ghbn_miss + ghbn_hits;
 605         return (ret);
 606     }
 607 }
 608
 609 #endif