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 #include <openssl/e_os2.h>
  66
  67 /* With IPv6, it looks like Digital has mixed up the proper order of
  68    recursive header file inclusion, resulting in the compiler complaining
  69    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
  70    is needed to have fileno() declared correctly...  So let's define u_int */
  71 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
  72 #define __U_INT
  73 typedef unsigned int u_int;
  74 #endif
  75
  76 #define USE_SOCKETS
  77 #define NON_MAIN
  78 #include "apps.h"
  79 #undef USE_SOCKETS
  80 #undef NON_MAIN
  81 #include "s_apps.h"
  82 #include <openssl/ssl.h>
  83
  84 static struct hostent *GetHostByName(char *name);
  85 #ifdef OPENSSL_SYS_WINDOWS
  86 static void ssl_sock_cleanup(void);
  87 #endif
  88 static int ssl_sock_init(void);
  89 static int init_client_ip(int *sock,unsigned char ip[4], int port);
  90 static int init_server(int *sock, int port);
  91 static int init_server_long(int *sock, int port,char *ip);
  92 static int do_accept(int acc_sock, int *sock, char **host);
  93 static int host_ip(char *str, unsigned char ip[4]);
  94
  95 #ifdef OPENSSL_SYS_WIN16
  96 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  97 #else
  98 #define SOCKET_PROTOCOL IPPROTO_TCP
  99 #endif
 100
 101 #ifdef OPENSSL_SYS_WINDOWS
 102 static struct WSAData wsa_state;
 103 static int wsa_init_done=0;
 104
 105 #ifdef OPENSSL_SYS_WIN16
 106 static HWND topWnd=0;
 107 static FARPROC lpTopWndProc=NULL;
 108 static FARPROC lpTopHookProc=NULL;
 109 extern HINSTANCE _hInstance;  /* nice global CRT provides */
 110
 111 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
 112              LPARAM lParam)
 113         {
 114         if (hwnd == topWnd)
 115                 {
 116                 switch(message)
 117                         {
 118                 case WM_DESTROY:
 119                 case WM_CLOSE:
 120                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
 121                         ssl_sock_cleanup();
 122                         break;
 123                         }
 124                 }
 125         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
 126         }
 127
 128 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
 129         {
 130         topWnd=hwnd;
 131         return(FALSE);
 132         }
 133
 134 #endif /* OPENSSL_SYS_WIN32 */
 135 #endif /* OPENSSL_SYS_WINDOWS */
 136
 137 #ifdef OPENSSL_SYS_WINDOWS
 138 static void ssl_sock_cleanup(void)
 139         {
 140         if (wsa_init_done)
 141                 {
 142                 wsa_init_done=0;
 143 #ifndef OPENSSL_SYS_WINCE
 144                 WSACancelBlockingCall();
 145 #endif
 146                 WSACleanup();
 147                 }
 148         }
 149 #endif
 150
 151 static int ssl_sock_init(void)
 152         {
 153 #ifdef WATT32
 154         extern int _watt_do_exit;
 155         _watt_do_exit = 0;
 156         dbug_init();
 157         if (sock_init())
 158                 return (0);
 159 #elif defined(OPENSSL_SYS_WINDOWS)
 160         if (!wsa_init_done)
 161                 {
 162                 int err;
 163
 164 #ifdef SIGINT
 165                 signal(SIGINT,(void (*)(int))ssl_sock_cleanup);
 166 #endif
 167                 wsa_init_done=1;
 168                 memset(&wsa_state,0,sizeof(wsa_state));
 169                 if (WSAStartup(0x0101,&wsa_state)!=0)
 170                         {
 171                         err=WSAGetLastError();
 172                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
 173                         return(0);
 174                         }
 175
 176 #ifdef OPENSSL_SYS_WIN16
 177                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
 178                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
 179                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
 180
 181                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
 182 #endif /* OPENSSL_SYS_WIN16 */
 183                 }
 184 #endif /* OPENSSL_SYS_WINDOWS */
 185         return(1);
 186         }
 187
 188 int init_client(int *sock, char *host, int port)
 189         {
 190         unsigned char ip[4];
 191         short p=0;
 192
 193         if (!host_ip(host,&(ip[0])))
 194                 {
 195                 return(0);
 196                 }
 197         if (p != 0) port=p;
 198         return(init_client_ip(sock,ip,port));
 199         }
 200
 201 static int init_client_ip(int *sock, unsigned char ip[4], int port)
 202         {
 203         unsigned long addr;
 204         struct sockaddr_in them;
 205         int s,i;
 206
 207         if (!ssl_sock_init()) return(0);
 208
 209         memset((char *)&them,0,sizeof(them));
 210         them.sin_family=AF_INET;
 211         them.sin_port=htons((unsigned short)port);
 212         addr=(unsigned long)
 213                 ((unsigned long)ip[0]<<24L)|
 214                 ((unsigned long)ip[1]<<16L)|
 215                 ((unsigned long)ip[2]<< 8L)|
 216                 ((unsigned long)ip[3]);
 217         them.sin_addr.s_addr=htonl(addr);
 218
 219         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 220         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 221
 222 #ifndef OPENSSL_SYS_MPE
 223         i=0;
 224         i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 225         if (i < 0) { perror("keepalive"); return(0); }
 226 #endif
 227
 228         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
 229                 { close(s); perror("connect"); return(0); }
 230         *sock=s;
 231         return(1);
 232         }
 233
 234 int do_server(int port, int *ret, int (*cb)(), char *context)
 235         {
 236         int sock;
 237         char *name;
 238         int accept_socket;
 239         int i;
 240
 241         if (!init_server(&accept_socket,port)) return(0);
 242
 243         if (ret != NULL)
 244                 {
 245                 *ret=accept_socket;
 246                 /* return(1);*/
 247                 }
 248         for (;;)
 249                 {
 250                 if (do_accept(accept_socket,&sock,&name) == 0)
 251                         {
 252                         SHUTDOWN(accept_socket);
 253                         return(0);
 254                         }
 255                 i=(*cb)(name,sock, context);
 256                 if (name != NULL) OPENSSL_free(name);
 257                 SHUTDOWN2(sock);
 258                 if (i < 0)
 259                         {
 260                         SHUTDOWN2(accept_socket);
 261                         return(i);
 262                         }
 263                 }
 264         }
 265
 266 static int init_server_long(int *sock, int port, char *ip)
 267         {
 268         int ret=0;
 269         struct sockaddr_in server;
 270         int s= -1,i;
 271
 272         if (!ssl_sock_init()) return(0);
 273
 274         memset((char *)&server,0,sizeof(server));
 275         server.sin_family=AF_INET;
 276         server.sin_port=htons((unsigned short)port);
 277         if (ip == NULL)
 278                 server.sin_addr.s_addr=INADDR_ANY;
 279         else
 280 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 281 #ifndef BIT_FIELD_LIMITS
 282                 memcpy(&server.sin_addr.s_addr,ip,4);
 283 #else
 284                 memcpy(&server.sin_addr,ip,4);
 285 #endif
 286         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 287
 288         if (s == INVALID_SOCKET) goto err;
 289 #if defined SOL_SOCKET && defined SO_REUSEADDR
 290                 {
 291                 int j = 1;
 292                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 293                            (void *) &j, sizeof j);
 294                 }
 295 #endif
 296         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 297                 {
 298 #ifndef OPENSSL_SYS_WINDOWS
 299                 perror("bind");
 300 #endif
 301                 goto err;
 302                 }
 303         /* Make it 128 for linux */
 304         if (listen(s,128) == -1) goto err;
 305         i=0;
 306         *sock=s;
 307         ret=1;
 308 err:
 309         if ((ret == 0) && (s != -1))
 310                 {
 311                 SHUTDOWN(s);
 312                 }
 313         return(ret);
 314         }
 315
 316 static int init_server(int *sock, int port)
 317         {
 318         return(init_server_long(sock, port, NULL));
 319         }
 320
 321 static int do_accept(int acc_sock, int *sock, char **host)
 322         {
 323         int ret,i;
 324         struct hostent *h1,*h2;
 325         static struct sockaddr_in from;
 326         int len;
 327 /*      struct linger ling; */
 328
 329         if (!ssl_sock_init()) return(0);
 330
 331 #ifndef OPENSSL_SYS_WINDOWS
 332 redoit:
 333 #endif
 334
 335         memset((char *)&from,0,sizeof(from));
 336         len=sizeof(from);
 337         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 338          * of type (int *) whereas under other systems it is (void *) if
 339          * you don't have a cast it will choke the compiler: if you do
 340          * have a cast then you can either go for (int *) or (void *).
 341          */
 342         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
 343         if (ret == INVALID_SOCKET)
 344                 {
 345 #ifdef OPENSSL_SYS_WINDOWS
 346                 i=WSAGetLastError();
 347                 BIO_printf(bio_err,"accept error %d\n",i);
 348 #else
 349                 if (errno == EINTR)
 350                         {
 351                         /*check_timeout(); */
 352                         goto redoit;
 353                         }
 354                 fprintf(stderr,"errno=%d ",errno);
 355                 perror("accept");
 356 #endif
 357                 return(0);
 358                 }
 359
 360 /*
 361         ling.l_onoff=1;
 362         ling.l_linger=0;
 363         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 364         if (i < 0) { perror("linger"); return(0); }
 365         i=0;
 366         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 367         if (i < 0) { perror("keepalive"); return(0); }
 368 */
 369
 370         if (host == NULL) goto end;
 371 #ifndef BIT_FIELD_LIMITS
 372         /* I should use WSAAsyncGetHostByName() under windows */
 373         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
 374                 sizeof(from.sin_addr.s_addr),AF_INET);
 375 #else
 376         h1=gethostbyaddr((char *)&from.sin_addr,
 377                 sizeof(struct in_addr),AF_INET);
 378 #endif
 379         if (h1 == NULL)
 380                 {
 381                 BIO_printf(bio_err,"bad gethostbyaddr\n");
 382                 *host=NULL;
 383                 /* return(0); */
 384                 }
 385         else
 386                 {
 387                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
 388                         {
 389                         perror("OPENSSL_malloc");
 390                         return(0);
 391                         }
 392                 strcpy(*host,h1->h_name);
 393
 394                 h2=GetHostByName(*host);
 395                 if (h2 == NULL)
 396                         {
 397                         BIO_printf(bio_err,"gethostbyname failure\n");
 398                         return(0);
 399                         }
 400                 i=0;
 401                 if (h2->h_addrtype != AF_INET)
 402                         {
 403                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 404                         return(0);
 405                         }
 406                 }
 407 end:
 408         *sock=ret;
 409         return(1);
 410         }
 411
 412 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 413              short *port_ptr)
 414         {
 415         char *h,*p;
 416
 417         h=str;
 418         p=strchr(str,':');
 419         if (p == NULL)
 420                 {
 421                 BIO_printf(bio_err,"no port defined\n");
 422                 return(0);
 423                 }
 424         *(p++)='\0';
 425
 426         if ((ip != NULL) && !host_ip(str,ip))
 427                 goto err;
 428         if (host_ptr != NULL) *host_ptr=h;
 429
 430         if (!extract_port(p,port_ptr))
 431                 goto err;
 432         return(1);
 433 err:
 434         return(0);
 435         }
 436
 437 static int host_ip(char *str, unsigned char ip[4])
 438         {
 439         unsigned int in[4];
 440         int i;
 441
 442         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
 443                 {
 444                 for (i=0; i<4; i++)
 445                         if (in[i] > 255)
 446                                 {
 447                                 BIO_printf(bio_err,"invalid IP address\n");
 448                                 goto err;
 449                                 }
 450                 ip[0]=in[0];
 451                 ip[1]=in[1];
 452                 ip[2]=in[2];
 453                 ip[3]=in[3];
 454                 }
 455         else
 456                 { /* do a gethostbyname */
 457                 struct hostent *he;
 458
 459                 if (!ssl_sock_init()) return(0);
 460
 461                 he=GetHostByName(str);
 462                 if (he == NULL)
 463                         {
 464                         BIO_printf(bio_err,"gethostbyname failure\n");
 465                         goto err;
 466                         }
 467                 /* cast to short because of win16 winsock definition */
 468                 if ((short)he->h_addrtype != AF_INET)
 469                         {
 470                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 471                         return(0);
 472                         }
 473                 ip[0]=he->h_addr_list[0][0];
 474                 ip[1]=he->h_addr_list[0][1];
 475                 ip[2]=he->h_addr_list[0][2];
 476                 ip[3]=he->h_addr_list[0][3];
 477                 }
 478         return(1);
 479 err:
 480         return(0);
 481         }
 482
 483 int extract_port(char *str, short *port_ptr)
 484         {
 485         int i;
 486         struct servent *s;
 487
 488         i=atoi(str);
 489         if (i != 0)
 490                 *port_ptr=(unsigned short)i;
 491         else
 492                 {
 493                 s=getservbyname(str,"tcp");
 494                 if (s == NULL)
 495                         {
 496                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
 497                         return(0);
 498                         }
 499                 *port_ptr=ntohs((unsigned short)s->s_port);
 500                 }
 501         return(1);
 502         }
 503
 504 #define GHBN_NUM        4
 505 static struct ghbn_cache_st
 506         {
 507         char name[128];
 508         struct hostent ent;
 509         unsigned long order;
 510         } ghbn_cache[GHBN_NUM];
 511
 512 static unsigned long ghbn_hits=0L;
 513 static unsigned long ghbn_miss=0L;
 514
 515 static struct hostent *GetHostByName(char *name)
 516         {
 517         struct hostent *ret;
 518         int i,lowi=0;
 519         unsigned long low= (unsigned long)-1;
 520
 521         for (i=0; i<GHBN_NUM; i++)
 522                 {
 523                 if (low > ghbn_cache[i].order)
 524                         {
 525                         low=ghbn_cache[i].order;
 526                         lowi=i;
 527                         }
 528                 if (ghbn_cache[i].order > 0)
 529                         {
 530                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
 531                                 break;
 532                         }
 533                 }
 534         if (i == GHBN_NUM) /* no hit*/
 535                 {
 536                 ghbn_miss++;
 537                 ret=gethostbyname(name);
 538                 if (ret == NULL) return(NULL);
 539                 /* else add to cache */
 540                 if(strlen(name) < sizeof ghbn_cache[0].name)
 541                         {
 542                         strcpy(ghbn_cache[lowi].name,name);
 543                         memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
 544                         ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
 545                         }
 546                 return(ret);
 547                 }
 548         else
 549                 {
 550                 ghbn_hits++;
 551                 ret= &(ghbn_cache[i].ent);
 552                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
 553                 return(ret);
 554                 }
 555         }