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