apps/s_socket.c

   1 /* apps/s_socket.c -  socket-related functions used by s_client and s_server */
   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 <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <errno.h>
  63 #include <signal.h>
  64
  65 /* With IPv6, it looks like Digital has mixed up the proper order of
  66    recursive header file inclusion, resulting in the compiler complaining
  67    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
  68    is needed to have fileno() declared correctly...  So let's define u_int */
  69 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
  70 #define __U_INT
  71 typedef unsigned int u_int;
  72 #endif
  73
  74 #define USE_SOCKETS
  75 #define NON_MAIN
  76 #include "apps.h"
  77 #undef USE_SOCKETS
  78 #undef NON_MAIN
  79 #include "s_apps.h"
  80 #include <openssl/ssl.h>
  81
  82 #ifdef FLAT_INC
  83 #include "e_os.h"
  84 #else
  85 #include "../e_os.h"
  86 #endif
  87
  88 #ifndef OPENSSL_NO_SOCK
  89
  90 #if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
  91 #include "netdb.h"
  92 #endif
  93
  94 static struct hostent *GetHostByName(char *name);
  95 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
  96 static void ssl_sock_cleanup(void);
  97 #endif
  98 static int ssl_sock_init(void);
  99 static int init_client_ip(int *sock,unsigned char ip[4], int port, int type);
 100 static int init_server(int *sock, int port, int type);
 101 static int init_server_long(int *sock, int port,char *ip, int type);
 102 static int do_accept(int acc_sock, int *sock, char **host);
 103 static int host_ip(char *str, unsigned char ip[4]);
 104
 105 #ifdef OPENSSL_SYS_WIN16
 106 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
 107 #else
 108 #define SOCKET_PROTOCOL IPPROTO_TCP
 109 #endif
 110
 111 #if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 112 static int wsa_init_done=0;
 113 #endif
 114
 115 #ifdef OPENSSL_SYS_WINDOWS
 116 static struct WSAData wsa_state;
 117 static int wsa_init_done=0;
 118
 119 #ifdef OPENSSL_SYS_WIN16
 120 static HWND topWnd=0;
 121 static FARPROC lpTopWndProc=NULL;
 122 static FARPROC lpTopHookProc=NULL;
 123 extern HINSTANCE _hInstance;  /* nice global CRT provides */
 124
 125 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
 126              LPARAM lParam)
 127         {
 128         if (hwnd == topWnd)
 129                 {
 130                 switch(message)
 131                         {
 132                 case WM_DESTROY:
 133                 case WM_CLOSE:
 134                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
 135                         ssl_sock_cleanup();
 136                         break;
 137                         }
 138                 }
 139         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
 140         }
 141
 142 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
 143         {
 144         topWnd=hwnd;
 145         return(FALSE);
 146         }
 147
 148 #endif /* OPENSSL_SYS_WIN32 */
 149 #endif /* OPENSSL_SYS_WINDOWS */
 150
 151 #ifdef OPENSSL_SYS_WINDOWS
 152 static void ssl_sock_cleanup(void)
 153         {
 154         if (wsa_init_done)
 155                 {
 156                 wsa_init_done=0;
 157 #ifndef OPENSSL_SYS_WINCE
 158                 WSACancelBlockingCall();
 159 #endif
 160                 WSACleanup();
 161                 }
 162         }
 163 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 164 static void sock_cleanup(void)
 165     {
 166     if (wsa_init_done)
 167         {
 168         wsa_init_done=0;
 169                 WSACleanup();
 170                 }
 171         }
 172 #endif
 173
 174 static int ssl_sock_init(void)
 175         {
 176 #ifdef WATT32
 177         extern int _watt_do_exit;
 178         _watt_do_exit = 0;
 179         if (sock_init())
 180                 return (0);
 181 #elif defined(OPENSSL_SYS_WINDOWS)
 182         if (!wsa_init_done)
 183                 {
 184                 int err;
 185
 186 #ifdef SIGINT
 187                 signal(SIGINT,(void (*)(int))ssl_sock_cleanup);
 188 #endif
 189                 wsa_init_done=1;
 190                 memset(&wsa_state,0,sizeof(wsa_state));
 191                 if (WSAStartup(0x0101,&wsa_state)!=0)
 192                         {
 193                         err=WSAGetLastError();
 194                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
 195                         return(0);
 196                         }
 197
 198 #ifdef OPENSSL_SYS_WIN16
 199                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
 200                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
 201                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
 202
 203                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
 204 #endif /* OPENSSL_SYS_WIN16 */
 205                 }
 206 #elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
 207    WORD wVerReq;
 208    WSADATA wsaData;
 209    int err;
 210
 211    if (!wsa_init_done)
 212       {
 213
 214 # ifdef SIGINT
 215       signal(SIGINT,(void (*)(int))sock_cleanup);
 216 # endif
 217
 218       wsa_init_done=1;
 219       wVerReq = MAKEWORD( 2, 0 );
 220       err = WSAStartup(wVerReq,&wsaData);
 221       if (err != 0)
 222          {
 223          BIO_printf(bio_err,"unable to start WINSOCK2, error code=%d\n",err);
 224          return(0);
 225          }
 226       }
 227 #endif /* OPENSSL_SYS_WINDOWS */
 228         return(1);
 229         }
 230
 231 int init_client(int *sock, char *host, int port, int type)
 232         {
 233         unsigned char ip[4];
 234
 235         if (!host_ip(host,&(ip[0])))
 236                 {
 237                 return(0);
 238                 }
 239         return(init_client_ip(sock,ip,port,type));
 240         }
 241
 242 static int init_client_ip(int *sock, unsigned char ip[4], int port, int type)
 243         {
 244         unsigned long addr;
 245         struct sockaddr_in them;
 246         int s,i;
 247
 248         if (!ssl_sock_init()) return(0);
 249
 250         memset((char *)&them,0,sizeof(them));
 251         them.sin_family=AF_INET;
 252         them.sin_port=htons((unsigned short)port);
 253         addr=(unsigned long)
 254                 ((unsigned long)ip[0]<<24L)|
 255                 ((unsigned long)ip[1]<<16L)|
 256                 ((unsigned long)ip[2]<< 8L)|
 257                 ((unsigned long)ip[3]);
 258         them.sin_addr.s_addr=htonl(addr);
 259
 260         if (type == SOCK_STREAM)
 261                 s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 262         else /* ( type == SOCK_DGRAM) */
 263                 s=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 264
 265         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 266
 267 #if defined(SO_KEEPALIVE) && !defined(OPENSSL_SYS_MPE)
 268         if (type == SOCK_STREAM)
 269                 {
 270                 i=0;
 271                 i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 272                 if (i < 0) { perror("keepalive"); return(0); }
 273                 }
 274 #endif
 275
 276         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
 277                 { closesocket(s); perror("connect"); return(0); }
 278         *sock=s;
 279         return(1);
 280         }
 281
 282 int do_server(int port, int type, int *ret, int (*cb)(char *hostname, int s, unsigned char *context), unsigned char *context)
 283         {
 284         int sock;
 285         char *name = NULL;
 286         int accept_socket = 0;
 287         int i;
 288
 289         if (!init_server(&accept_socket,port,type)) return(0);
 290
 291         if (ret != NULL)
 292                 {
 293                 *ret=accept_socket;
 294                 /* return(1);*/
 295                 }
 296         for (;;)
 297                 {
 298                 if (type==SOCK_STREAM)
 299                         {
 300                         if (do_accept(accept_socket,&sock,&name) == 0)
 301                                 {
 302                                 SHUTDOWN(accept_socket);
 303                                 return(0);
 304                                 }
 305                         }
 306                 else
 307                         sock = accept_socket;
 308                 i=(*cb)(name,sock, context);
 309                 if (name != NULL) OPENSSL_free(name);
 310                 if (type==SOCK_STREAM)
 311                         SHUTDOWN2(sock);
 312                 if (i < 0)
 313                         {
 314                         SHUTDOWN2(accept_socket);
 315                         return(i);
 316                         }
 317                 }
 318         }
 319
 320 static int init_server_long(int *sock, int port, char *ip, int type)
 321         {
 322         int ret=0;
 323         struct sockaddr_in server;
 324         int s= -1;
 325
 326         if (!ssl_sock_init()) return(0);
 327
 328         memset((char *)&server,0,sizeof(server));
 329         server.sin_family=AF_INET;
 330         server.sin_port=htons((unsigned short)port);
 331         if (ip == NULL)
 332                 server.sin_addr.s_addr=INADDR_ANY;
 333         else
 334 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 335 #ifndef BIT_FIELD_LIMITS
 336                 memcpy(&server.sin_addr.s_addr,ip,4);
 337 #else
 338                 memcpy(&server.sin_addr,ip,4);
 339 #endif
 340
 341                 if (type == SOCK_STREAM)
 342                         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 343                 else /* type == SOCK_DGRAM */
 344                         s=socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP);
 345
 346         if (s == INVALID_SOCKET) goto err;
 347 #if defined SOL_SOCKET && defined SO_REUSEADDR
 348                 {
 349                 int j = 1;
 350                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 351                            (void *) &j, sizeof j);
 352                 }
 353 #endif
 354         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 355                 {
 356 #ifndef OPENSSL_SYS_WINDOWS
 357                 perror("bind");
 358 #endif
 359                 goto err;
 360                 }
 361         /* Make it 128 for linux */
 362         if (type==SOCK_STREAM && listen(s,128) == -1) goto err;
 363         *sock=s;
 364         ret=1;
 365 err:
 366         if ((ret == 0) && (s != -1))
 367                 {
 368                 SHUTDOWN(s);
 369                 }
 370         return(ret);
 371         }
 372
 373 static int init_server(int *sock, int port, int type)
 374         {
 375         return(init_server_long(sock, port, NULL, type));
 376         }
 377
 378 static int do_accept(int acc_sock, int *sock, char **host)
 379         {
 380         int ret;
 381         struct hostent *h1,*h2;
 382         static struct sockaddr_in from;
 383         int len;
 384 /*      struct linger ling; */
 385
 386         if (!ssl_sock_init()) return(0);
 387
 388 #ifndef OPENSSL_SYS_WINDOWS
 389 redoit:
 390 #endif
 391
 392         memset((char *)&from,0,sizeof(from));
 393         len=sizeof(from);
 394         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 395          * of type (int *) whereas under other systems it is (void *) if
 396          * you don't have a cast it will choke the compiler: if you do
 397          * have a cast then you can either go for (int *) or (void *).
 398          */
 399         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
 400         if (ret == INVALID_SOCKET)
 401                 {
 402 #if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
 403                 i=WSAGetLastError();
 404                 BIO_printf(bio_err,"accept error %d\n",i);
 405 #else
 406                 if (errno == EINTR)
 407                         {
 408                         /*check_timeout(); */
 409                         goto redoit;
 410                         }
 411                 fprintf(stderr,"errno=%d ",errno);
 412                 perror("accept");
 413 #endif
 414                 return(0);
 415                 }
 416
 417 /*
 418         ling.l_onoff=1;
 419         ling.l_linger=0;
 420         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 421         if (i < 0) { perror("linger"); return(0); }
 422         i=0;
 423         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 424         if (i < 0) { perror("keepalive"); return(0); }
 425 */
 426
 427         if (host == NULL) goto end;
 428 #ifndef BIT_FIELD_LIMITS
 429         /* I should use WSAAsyncGetHostByName() under windows */
 430         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
 431                 sizeof(from.sin_addr.s_addr),AF_INET);
 432 #else
 433         h1=gethostbyaddr((char *)&from.sin_addr,
 434                 sizeof(struct in_addr),AF_INET);
 435 #endif
 436         if (h1 == NULL)
 437                 {
 438                 BIO_printf(bio_err,"bad gethostbyaddr\n");
 439                 *host=NULL;
 440                 /* return(0); */
 441                 }
 442         else
 443                 {
 444                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
 445                         {
 446                         perror("OPENSSL_malloc");
 447                         return(0);
 448                         }
 449                 BUF_strlcpy(*host,h1->h_name,strlen(h1->h_name)+1);
 450
 451                 h2=GetHostByName(*host);
 452                 if (h2 == NULL)
 453                         {
 454                         BIO_printf(bio_err,"gethostbyname failure\n");
 455                         return(0);
 456                         }
 457                 if (h2->h_addrtype != AF_INET)
 458                         {
 459                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 460                         return(0);
 461                         }
 462                 }
 463 end:
 464         *sock=ret;
 465         return(1);
 466         }
 467
 468 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 469              short *port_ptr)
 470         {
 471         char *h,*p;
 472
 473         h=str;
 474         p=strchr(str,':');
 475         if (p == NULL)
 476                 {
 477                 BIO_printf(bio_err,"no port defined\n");
 478                 return(0);
 479                 }
 480         *(p++)='\0';
 481
 482         if ((ip != NULL) && !host_ip(str,ip))
 483                 goto err;
 484         if (host_ptr != NULL) *host_ptr=h;
 485
 486         if (!extract_port(p,port_ptr))
 487                 goto err;
 488         return(1);
 489 err:
 490         return(0);
 491         }
 492
 493 static int host_ip(char *str, unsigned char ip[4])
 494         {
 495         unsigned int in[4];
 496         int i;
 497
 498         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
 499                 {
 500                 for (i=0; i<4; i++)
 501                         if (in[i] > 255)
 502                                 {
 503                                 BIO_printf(bio_err,"invalid IP address\n");
 504                                 goto err;
 505                                 }
 506                 ip[0]=in[0];
 507                 ip[1]=in[1];
 508                 ip[2]=in[2];
 509                 ip[3]=in[3];
 510                 }
 511         else
 512                 { /* do a gethostbyname */
 513                 struct hostent *he;
 514
 515                 if (!ssl_sock_init()) return(0);
 516
 517                 he=GetHostByName(str);
 518                 if (he == NULL)
 519                         {
 520                         BIO_printf(bio_err,"gethostbyname failure\n");
 521                         goto err;
 522                         }
 523                 /* cast to short because of win16 winsock definition */
 524                 if ((short)he->h_addrtype != AF_INET)
 525                         {
 526                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 527                         return(0);
 528                         }
 529                 ip[0]=he->h_addr_list[0][0];
 530                 ip[1]=he->h_addr_list[0][1];
 531                 ip[2]=he->h_addr_list[0][2];
 532                 ip[3]=he->h_addr_list[0][3];
 533                 }
 534         return(1);
 535 err:
 536         return(0);
 537         }
 538
 539 int extract_port(char *str, short *port_ptr)
 540         {
 541         int i;
 542         struct servent *s;
 543
 544         i=atoi(str);
 545         if (i != 0)
 546                 *port_ptr=(unsigned short)i;
 547         else
 548                 {
 549                 s=getservbyname(str,"tcp");
 550                 if (s == NULL)
 551                         {
 552                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
 553                         return(0);
 554                         }
 555                 *port_ptr=ntohs((unsigned short)s->s_port);
 556                 }
 557         return(1);
 558         }
 559
 560 #define GHBN_NUM        4
 561 static struct ghbn_cache_st
 562         {
 563         char name[128];
 564         struct hostent ent;
 565         unsigned long order;
 566         } ghbn_cache[GHBN_NUM];
 567
 568 static unsigned long ghbn_hits=0L;
 569 static unsigned long ghbn_miss=0L;
 570
 571 static struct hostent *GetHostByName(char *name)
 572         {
 573         struct hostent *ret;
 574         int i,lowi=0;
 575         unsigned long low= (unsigned long)-1;
 576
 577         for (i=0; i<GHBN_NUM; i++)
 578                 {
 579                 if (low > ghbn_cache[i].order)
 580                         {
 581                         low=ghbn_cache[i].order;
 582                         lowi=i;
 583                         }
 584                 if (ghbn_cache[i].order > 0)
 585                         {
 586                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
 587                                 break;
 588                         }
 589                 }
 590         if (i == GHBN_NUM) /* no hit*/
 591                 {
 592                 ghbn_miss++;
 593                 ret=gethostbyname(name);
 594                 if (ret == NULL) return(NULL);
 595                 /* else add to cache */
 596                 if(strlen(name) < sizeof ghbn_cache[0].name)
 597                         {
 598                         strcpy(ghbn_cache[lowi].name,name);
 599                         memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
 600                         ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
 601                         }
 602                 return(ret);
 603                 }
 604         else
 605                 {
 606                 ghbn_hits++;
 607                 ret= &(ghbn_cache[i].ent);
 608                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
 609                 return(ret);
 610                 }
 611         }
 612
 613 #endif