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(VMS) && defined(__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 static struct hostent *GetHostByName(char *name);
  83 static void sock_cleanup(void);
  84 static int sock_init(void);
  85 static int init_client_ip(int *sock,unsigned char ip[4], int port);
  86 static int init_server(int *sock, int port);
  87 static int init_server_long(int *sock, int port,char *ip);
  88 static int do_accept(int acc_sock, int *sock, char **host);
  89 static int host_ip(char *str, unsigned char ip[4]);
  90
  91 #ifdef WIN16
  92 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  93 #else
  94 #define SOCKET_PROTOCOL IPPROTO_TCP
  95 #endif
  96
  97 #ifdef WINDOWS
  98 static struct WSAData wsa_state;
  99 static int wsa_init_done=0;
 100
 101 #ifdef WIN16
 102 static HWND topWnd=0;
 103 static FARPROC lpTopWndProc=NULL;
 104 static FARPROC lpTopHookProc=NULL;
 105 extern HINSTANCE _hInstance;  /* nice global CRT provides */
 106
 107 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
 108              LPARAM lParam)
 109         {
 110         if (hwnd == topWnd)
 111                 {
 112                 switch(message)
 113                         {
 114                 case WM_DESTROY:
 115                 case WM_CLOSE:
 116                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
 117                         sock_cleanup();
 118                         break;
 119                         }
 120                 }
 121         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
 122         }
 123
 124 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
 125         {
 126         topWnd=hwnd;
 127         return(FALSE);
 128         }
 129
 130 #endif /* WIN32 */
 131 #endif /* WINDOWS */
 132
 133 static void sock_cleanup(void)
 134         {
 135 #ifdef WINDOWS
 136         if (wsa_init_done)
 137                 {
 138                 wsa_init_done=0;
 139                 WSACancelBlockingCall();
 140                 WSACleanup();
 141                 }
 142 #endif
 143         }
 144
 145 static int sock_init(void)
 146         {
 147 #ifdef WINDOWS
 148         if (!wsa_init_done)
 149                 {
 150                 int err;
 151
 152 #ifdef SIGINT
 153                 signal(SIGINT,(void (*)(int))sock_cleanup);
 154 #endif
 155                 wsa_init_done=1;
 156                 memset(&wsa_state,0,sizeof(wsa_state));
 157                 if (WSAStartup(0x0101,&wsa_state)!=0)
 158                         {
 159                         err=WSAGetLastError();
 160                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
 161                         return(0);
 162                         }
 163
 164 #ifdef WIN16
 165                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
 166                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
 167                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
 168
 169                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
 170 #endif /* WIN16 */
 171                 }
 172 #endif /* WINDOWS */
 173         return(1);
 174         }
 175
 176 int init_client(int *sock, char *host, int port)
 177         {
 178         unsigned char ip[4];
 179         short p=0;
 180
 181         if (!host_ip(host,&(ip[0])))
 182                 {
 183                 return(0);
 184                 }
 185         if (p != 0) port=p;
 186         return(init_client_ip(sock,ip,port));
 187         }
 188
 189 static int init_client_ip(int *sock, unsigned char ip[4], int port)
 190         {
 191         unsigned long addr;
 192         struct sockaddr_in them;
 193         int s,i;
 194
 195         if (!sock_init()) return(0);
 196
 197         memset((char *)&them,0,sizeof(them));
 198         them.sin_family=AF_INET;
 199         them.sin_port=htons((unsigned short)port);
 200         addr=(unsigned long)
 201                 ((unsigned long)ip[0]<<24L)|
 202                 ((unsigned long)ip[1]<<16L)|
 203                 ((unsigned long)ip[2]<< 8L)|
 204                 ((unsigned long)ip[3]);
 205         them.sin_addr.s_addr=htonl(addr);
 206
 207         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 208         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 209
 210         i=0;
 211         i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 212         if (i < 0) { perror("keepalive"); return(0); }
 213
 214         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
 215                 { close(s); perror("connect"); return(0); }
 216         *sock=s;
 217         return(1);
 218         }
 219
 220 int do_server(int port, int *ret, int (*cb)(), char *context)
 221         {
 222         int sock;
 223         char *name;
 224         int accept_socket;
 225         int i;
 226
 227         if (!init_server(&accept_socket,port)) return(0);
 228
 229         if (ret != NULL)
 230                 {
 231                 *ret=accept_socket;
 232                 /* return(1);*/
 233                 }
 234         for (;;)
 235                 {
 236                 if (do_accept(accept_socket,&sock,&name) == 0)
 237                         {
 238                         SHUTDOWN(accept_socket);
 239                         return(0);
 240                         }
 241                 i=(*cb)(name,sock, context);
 242                 if (name != NULL) Free(name);
 243                 SHUTDOWN2(sock);
 244                 if (i < 0)
 245                         {
 246                         SHUTDOWN2(accept_socket);
 247                         return(i);
 248                         }
 249                 }
 250         }
 251
 252 static int init_server_long(int *sock, int port, char *ip)
 253         {
 254         int ret=0;
 255         struct sockaddr_in server;
 256         int s= -1,i;
 257
 258         if (!sock_init()) return(0);
 259
 260         memset((char *)&server,0,sizeof(server));
 261         server.sin_family=AF_INET;
 262         server.sin_port=htons((unsigned short)port);
 263         if (ip == NULL)
 264                 server.sin_addr.s_addr=INADDR_ANY;
 265         else
 266 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 267 #ifndef BIT_FIELD_LIMITS
 268                 memcpy(&server.sin_addr.s_addr,ip,4);
 269 #else
 270                 memcpy(&server.sin_addr,ip,4);
 271 #endif
 272         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 273
 274         if (s == INVALID_SOCKET) goto err;
 275 #if defined SOL_SOCKET && defined SO_REUSEADDR
 276                 {
 277                 int j = 1;
 278                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 279                            (void *) &j, sizeof j);
 280                 }
 281 #endif
 282         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 283                 {
 284 #ifndef WINDOWS
 285                 perror("bind");
 286 #endif
 287                 goto err;
 288                 }
 289         /* Make it 128 for linux */
 290         if (listen(s,128) == -1) goto err;
 291         i=0;
 292         *sock=s;
 293         ret=1;
 294 err:
 295         if ((ret == 0) && (s != -1))
 296                 {
 297                 SHUTDOWN(s);
 298                 }
 299         return(ret);
 300         }
 301
 302 static int init_server(int *sock, int port)
 303         {
 304         return(init_server_long(sock, port, NULL));
 305         }
 306
 307 static int do_accept(int acc_sock, int *sock, char **host)
 308         {
 309         int ret,i;
 310         struct hostent *h1,*h2;
 311         static struct sockaddr_in from;
 312         int len;
 313 /*      struct linger ling; */
 314
 315         if (!sock_init()) return(0);
 316
 317 #ifndef WINDOWS
 318 redoit:
 319 #endif
 320
 321         memset((char *)&from,0,sizeof(from));
 322         len=sizeof(from);
 323         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 324          * of type (int *) whereas under other systems it is (void *) if
 325          * you don't have a cast it will choke the compiler: if you do
 326          * have a cast then you can either go for (int *) or (void *).
 327          */
 328         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
 329         if (ret == INVALID_SOCKET)
 330                 {
 331 #ifdef WINDOWS
 332                 i=WSAGetLastError();
 333                 BIO_printf(bio_err,"accept error %d\n",i);
 334 #else
 335                 if (errno == EINTR)
 336                         {
 337                         /*check_timeout(); */
 338                         goto redoit;
 339                         }
 340                 fprintf(stderr,"errno=%d ",errno);
 341                 perror("accept");
 342 #endif
 343                 return(0);
 344                 }
 345
 346 /*
 347         ling.l_onoff=1;
 348         ling.l_linger=0;
 349         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 350         if (i < 0) { perror("linger"); return(0); }
 351         i=0;
 352         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 353         if (i < 0) { perror("keepalive"); return(0); }
 354 */
 355
 356         if (host == NULL) goto end;
 357 #ifndef BIT_FIELD_LIMITS
 358         /* I should use WSAAsyncGetHostByName() under windows */
 359         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
 360                 sizeof(from.sin_addr.s_addr),AF_INET);
 361 #else
 362         h1=gethostbyaddr((char *)&from.sin_addr,
 363                 sizeof(struct in_addr),AF_INET);
 364 #endif
 365         if (h1 == NULL)
 366                 {
 367                 BIO_printf(bio_err,"bad gethostbyaddr\n");
 368                 *host=NULL;
 369                 /* return(0); */
 370                 }
 371         else
 372                 {
 373                 if ((*host=(char *)Malloc(strlen(h1->h_name)+1)) == NULL)
 374                         {
 375                         perror("Malloc");
 376                         return(0);
 377                         }
 378                 strcpy(*host,h1->h_name);
 379
 380                 h2=GetHostByName(*host);
 381                 if (h2 == NULL)
 382                         {
 383                         BIO_printf(bio_err,"gethostbyname failure\n");
 384                         return(0);
 385                         }
 386                 i=0;
 387                 if (h2->h_addrtype != AF_INET)
 388                         {
 389                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 390                         return(0);
 391                         }
 392                 }
 393 end:
 394         *sock=ret;
 395         return(1);
 396         }
 397
 398 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 399              short *port_ptr)
 400         {
 401         char *h,*p;
 402
 403         h=str;
 404         p=strchr(str,':');
 405         if (p == NULL)
 406                 {
 407                 BIO_printf(bio_err,"no port defined\n");
 408                 return(0);
 409                 }
 410         *(p++)='\0';
 411
 412         if ((ip != NULL) && !host_ip(str,ip))
 413                 goto err;
 414         if (host_ptr != NULL) *host_ptr=h;
 415
 416         if (!extract_port(p,port_ptr))
 417                 goto err;
 418         return(1);
 419 err:
 420         return(0);
 421         }
 422
 423 static int host_ip(char *str, unsigned char ip[4])
 424         {
 425         unsigned int in[4];
 426         int i;
 427
 428         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
 429                 {
 430                 for (i=0; i<4; i++)
 431                         if (in[i] > 255)
 432                                 {
 433                                 BIO_printf(bio_err,"invalid IP address\n");
 434                                 goto err;
 435                                 }
 436                 ip[0]=in[0];
 437                 ip[1]=in[1];
 438                 ip[2]=in[2];
 439                 ip[3]=in[3];
 440                 }
 441         else
 442                 { /* do a gethostbyname */
 443                 struct hostent *he;
 444
 445                 if (!sock_init()) return(0);
 446
 447                 he=GetHostByName(str);
 448                 if (he == NULL)
 449                         {
 450                         BIO_printf(bio_err,"gethostbyname failure\n");
 451                         goto err;
 452                         }
 453                 /* cast to short because of win16 winsock definition */
 454                 if ((short)he->h_addrtype != AF_INET)
 455                         {
 456                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 457                         return(0);
 458                         }
 459                 ip[0]=he->h_addr_list[0][0];
 460                 ip[1]=he->h_addr_list[0][1];
 461                 ip[2]=he->h_addr_list[0][2];
 462                 ip[3]=he->h_addr_list[0][3];
 463                 }
 464         return(1);
 465 err:
 466         return(0);
 467         }
 468
 469 int extract_port(char *str, short *port_ptr)
 470         {
 471         int i;
 472         struct servent *s;
 473
 474         i=atoi(str);
 475         if (i != 0)
 476                 *port_ptr=(unsigned short)i;
 477         else
 478                 {
 479                 s=getservbyname(str,"tcp");
 480                 if (s == NULL)
 481                         {
 482                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
 483                         return(0);
 484                         }
 485                 *port_ptr=ntohs((unsigned short)s->s_port);
 486                 }
 487         return(1);
 488         }
 489
 490 #define GHBN_NUM        4
 491 static struct ghbn_cache_st
 492         {
 493         char name[128];
 494         struct hostent ent;
 495         unsigned long order;
 496         } ghbn_cache[GHBN_NUM];
 497
 498 static unsigned long ghbn_hits=0L;
 499 static unsigned long ghbn_miss=0L;
 500
 501 static struct hostent *GetHostByName(char *name)
 502         {
 503         struct hostent *ret;
 504         int i,lowi=0;
 505         unsigned long low= (unsigned long)-1;
 506
 507         for (i=0; i<GHBN_NUM; i++)
 508                 {
 509                 if (low > ghbn_cache[i].order)
 510                         {
 511                         low=ghbn_cache[i].order;
 512                         lowi=i;
 513                         }
 514                 if (ghbn_cache[i].order > 0)
 515                         {
 516                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
 517                                 break;
 518                         }
 519                 }
 520         if (i == GHBN_NUM) /* no hit*/
 521                 {
 522                 ghbn_miss++;
 523                 ret=gethostbyname(name);
 524                 if (ret == NULL) return(NULL);
 525                 /* else add to cache */
 526                 strncpy(ghbn_cache[lowi].name,name,128);
 527                 memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
 528                 ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
 529                 return(ret);
 530                 }
 531         else
 532                 {
 533                 ghbn_hits++;
 534                 ret= &(ghbn_cache[i].ent);
 535                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
 536                 return(ret);
 537                 }
 538         }