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