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);
 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
 238     memset(ip, '\0', sizeof(ip));
 239     if (!host_ip(host, &(ip[0])))
 240         return 0;
 241     return init_client_ip(sock, ip, port, type);
 242 }
 243
 244 static int init_client_ip(int *sock, unsigned char ip[4], int port, int type)
 245 {
 246     unsigned long addr;
 247     struct sockaddr_in them;
 248     int s, i;
 249
 250     if (!ssl_sock_init())
 251         return (0);
 252
 253     memset((char *)&them, 0, sizeof(them));
 254     them.sin_family = AF_INET;
 255     them.sin_port = htons((unsigned short)port);
 256     addr = (unsigned long)
 257         ((unsigned long)ip[0] << 24L) |
 258         ((unsigned long)ip[1] << 16L) |
 259         ((unsigned long)ip[2] << 8L) | ((unsigned long)ip[3]);
 260     them.sin_addr.s_addr = htonl(addr);
 261
 262     if (type == SOCK_STREAM)
 263         s = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
 264     else                        /* ( type == SOCK_DGRAM) */
 265         s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 266
 267     if (s == INVALID_SOCKET) {
 268         perror("socket");
 269         return (0);
 270     }
 271 # if defined(SO_KEEPALIVE) && !defined(OPENSSL_SYS_MPE)
 272     if (type == SOCK_STREAM) {
 273         i = 0;
 274         i = setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (char *)&i, sizeof(i));
 275         if (i < 0) {
 276             closesocket(s);
 277             perror("keepalive");
 278             return (0);
 279         }
 280     }
 281 # endif
 282
 283     if (connect(s, (struct sockaddr *)&them, sizeof(them)) == -1) {
 284         closesocket(s);
 285         perror("connect");
 286         return (0);
 287     }
 288     *sock = s;
 289     return (1);
 290 }
 291
 292 int do_server(int port, int type, int *ret,
 293               int (*cb) (int s, int stype, unsigned char *context),
 294               unsigned char *context, int naccept)
 295 {
 296     int sock;
 297     int accept_socket = 0;
 298     int i;
 299
 300     if (!init_server(&accept_socket, port, type))
 301         return (0);
 302
 303     if (ret != NULL) {
 304         *ret = accept_socket;
 305         /* return(1); */
 306     }
 307     for (;;) {
 308         if (type == SOCK_STREAM) {
 309             if (do_accept(accept_socket, &sock) == 0) {
 310                 SHUTDOWN(accept_socket);
 311                 return (0);
 312             }
 313         } else
 314             sock = accept_socket;
 315         i = (*cb) (sock, type, context);
 316         if (type == SOCK_STREAM)
 317             SHUTDOWN2(sock);
 318         if (naccept != -1)
 319             naccept--;
 320         if (i < 0 || naccept == 0) {
 321             SHUTDOWN2(accept_socket);
 322             return (i);
 323         }
 324     }
 325 }
 326
 327 static int init_server_long(int *sock, int port, char *ip, int type)
 328 {
 329     int ret = 0;
 330     struct sockaddr_in server;
 331     int s = -1;
 332
 333     if (!ssl_sock_init())
 334         return (0);
 335
 336     memset((char *)&server, 0, sizeof(server));
 337     server.sin_family = AF_INET;
 338     server.sin_port = htons((unsigned short)port);
 339     if (ip == NULL)
 340         server.sin_addr.s_addr = INADDR_ANY;
 341     else
 342 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 343 # ifndef BIT_FIELD_LIMITS
 344         memcpy(&server.sin_addr.s_addr, ip, 4);
 345 # else
 346         memcpy(&server.sin_addr, ip, 4);
 347 # endif
 348
 349     if (type == SOCK_STREAM)
 350         s = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
 351     else                        /* type == SOCK_DGRAM */
 352         s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 353
 354     if (s == INVALID_SOCKET)
 355         goto err;
 356 # if defined SOL_SOCKET && defined SO_REUSEADDR
 357     {
 358         int j = 1;
 359         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void *)&j, sizeof(j));
 360     }
 361 # endif
 362     if (bind(s, (struct sockaddr *)&server, sizeof(server)) == -1) {
 363 # ifndef OPENSSL_SYS_WINDOWS
 364         perror("bind");
 365 # endif
 366         goto err;
 367     }
 368     /* Make it 128 for linux */
 369     if (type == SOCK_STREAM && listen(s, 128) == -1)
 370         goto err;
 371     *sock = s;
 372     ret = 1;
 373  err:
 374     if ((ret == 0) && (s != -1)) {
 375         SHUTDOWN(s);
 376     }
 377     return (ret);
 378 }
 379
 380 static int init_server(int *sock, int port, int type)
 381 {
 382     return (init_server_long(sock, port, NULL, type));
 383 }
 384
 385 static int do_accept(int acc_sock, int *sock)
 386 {
 387     int ret;
 388
 389     if (!ssl_sock_init())
 390         return 0;
 391
 392 # ifndef OPENSSL_SYS_WINDOWS
 393  redoit:
 394 # endif
 395
 396     /*
 397      * Note: under VMS with SOCKETSHR the fourth parameter is currently of
 398      * type (int *) whereas under other systems it is (void *) if you don't
 399      * have a cast it will choke the compiler: if you do have a cast then you
 400      * can either go for (int *) or (void *).
 401      */
 402     ret = accept(acc_sock, NULL, NULL);
 403     if (ret == INVALID_SOCKET) {
 404 # if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
 405         int i;
 406         i = WSAGetLastError();
 407         BIO_printf(bio_err, "accept error %d\n", i);
 408 # else
 409         if (errno == EINTR) {
 410             /*
 411              * check_timeout();
 412              */
 413             goto redoit;
 414         }
 415         fprintf(stderr, "errno=%d ", errno);
 416         perror("accept");
 417 # endif
 418         return 0;
 419     }
 420
 421     *sock = ret;
 422     return 1;
 423 }
 424
 425 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 426                       short *port_ptr)
 427 {
 428     char *h, *p;
 429
 430     h = str;
 431     p = strchr(str, ':');
 432     if (p == NULL) {
 433         BIO_printf(bio_err, "no port defined\n");
 434         return (0);
 435     }
 436     *(p++) = '\0';
 437
 438     if ((ip != NULL) && !host_ip(str, ip))
 439         goto err;
 440     if (host_ptr != NULL)
 441         *host_ptr = h;
 442
 443     if (!extract_port(p, port_ptr))
 444         goto err;
 445     return (1);
 446  err:
 447     return (0);
 448 }
 449
 450 static int host_ip(char *str, unsigned char ip[4])
 451 {
 452     unsigned int in[4];
 453     int i;
 454
 455     if (sscanf(str, "%u.%u.%u.%u", &(in[0]), &(in[1]), &(in[2]), &(in[3])) ==
 456         4) {
 457         for (i = 0; i < 4; i++)
 458             if (in[i] > 255) {
 459                 BIO_printf(bio_err, "invalid IP address\n");
 460                 goto err;
 461             }
 462         ip[0] = in[0];
 463         ip[1] = in[1];
 464         ip[2] = in[2];
 465         ip[3] = in[3];
 466     } else {                    /* do a gethostbyname */
 467         struct hostent *he;
 468
 469         if (!ssl_sock_init())
 470             return (0);
 471
 472         he = GetHostByName(str);
 473         if (he == NULL) {
 474             BIO_printf(bio_err, "gethostbyname failure\n");
 475             goto err;
 476         }
 477         /* cast to short because of win16 winsock definition */
 478         if ((short)he->h_addrtype != AF_INET) {
 479             BIO_printf(bio_err, "gethostbyname addr is not AF_INET\n");
 480             return (0);
 481         }
 482         ip[0] = he->h_addr_list[0][0];
 483         ip[1] = he->h_addr_list[0][1];
 484         ip[2] = he->h_addr_list[0][2];
 485         ip[3] = he->h_addr_list[0][3];
 486     }
 487     return (1);
 488  err:
 489     return (0);
 490 }
 491
 492 int extract_port(char *str, short *port_ptr)
 493 {
 494     int i;
 495     struct servent *s;
 496
 497     i = atoi(str);
 498     if (i != 0)
 499         *port_ptr = (unsigned short)i;
 500     else {
 501         s = getservbyname(str, "tcp");
 502         if (s == NULL) {
 503             BIO_printf(bio_err, "getservbyname failure for %s\n", str);
 504             return (0);
 505         }
 506         *port_ptr = ntohs((unsigned short)s->s_port);
 507     }
 508     return (1);
 509 }
 510
 511 # define GHBN_NUM        4
 512 static struct ghbn_cache_st {
 513     char name[128];
 514     struct hostent ent;
 515     unsigned long order;
 516 } ghbn_cache[GHBN_NUM];
 517
 518 static unsigned long ghbn_hits = 0L;
 519 static unsigned long ghbn_miss = 0L;
 520
 521 static struct hostent *GetHostByName(char *name)
 522 {
 523     struct hostent *ret;
 524     int i, lowi = 0;
 525     unsigned long low = (unsigned long)-1;
 526
 527     for (i = 0; i < GHBN_NUM; i++) {
 528         if (low > ghbn_cache[i].order) {
 529             low = ghbn_cache[i].order;
 530             lowi = i;
 531         }
 532         if (ghbn_cache[i].order > 0) {
 533             if (strncmp(name, ghbn_cache[i].name, 128) == 0)
 534                 break;
 535         }
 536     }
 537     if (i == GHBN_NUM) {        /* no hit */
 538         ghbn_miss++;
 539         ret = gethostbyname(name);
 540         if (ret == NULL)
 541             return (NULL);
 542         /* else add to cache */
 543         if (strlen(name) < sizeof(ghbn_cache[0].name)) {
 544             strcpy(ghbn_cache[lowi].name, name);
 545             memcpy((char *)&(ghbn_cache[lowi].ent), ret,
 546                    sizeof(struct hostent));
 547             ghbn_cache[lowi].order = ghbn_miss + ghbn_hits;
 548         }
 549         return (ret);
 550     } else {
 551         ghbn_hits++;
 552         ret = &(ghbn_cache[i].ent);
 553         ghbn_cache[i].order = ghbn_miss + ghbn_hits;
 554         return (ret);
 555     }
 556 }
 557
 558 #endif