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 #ifdef WINDOWS
  84 static void sock_cleanup(void);
  85 #endif
  86 static int sock_init(void);
  87 static int init_client_ip(int *sock,unsigned char ip[4], int port);
  88 static int init_server(int *sock, int port);
  89 static int init_server_long(int *sock, int port,char *ip);
  90 static int do_accept(int acc_sock, int *sock, char **host);
  91 static int host_ip(char *str, unsigned char ip[4]);
  92
  93 #ifdef WIN16
  94 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  95 #else
  96 #define SOCKET_PROTOCOL IPPROTO_TCP
  97 #endif
  98
  99 #ifdef WINDOWS
 100 static struct WSAData wsa_state;
 101 static int wsa_init_done=0;
 102
 103 #ifdef WIN16
 104 static HWND topWnd=0;
 105 static FARPROC lpTopWndProc=NULL;
 106 static FARPROC lpTopHookProc=NULL;
 107 extern HINSTANCE _hInstance;  /* nice global CRT provides */
 108
 109 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
 110              LPARAM lParam)
 111         {
 112         if (hwnd == topWnd)
 113                 {
 114                 switch(message)
 115                         {
 116                 case WM_DESTROY:
 117                 case WM_CLOSE:
 118                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
 119                         sock_cleanup();
 120                         break;
 121                         }
 122                 }
 123         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
 124         }
 125
 126 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
 127         {
 128         topWnd=hwnd;
 129         return(FALSE);
 130         }
 131
 132 #endif /* WIN32 */
 133 #endif /* WINDOWS */
 134
 135 #ifdef WINDOWS
 136 static void sock_cleanup(void)
 137         {
 138         if (wsa_init_done)
 139                 {
 140                 wsa_init_done=0;
 141                 WSACancelBlockingCall();
 142                 WSACleanup();
 143                 }
 144         }
 145 #endif
 146
 147 static int sock_init(void)
 148         {
 149 #ifdef WINDOWS
 150         if (!wsa_init_done)
 151                 {
 152                 int err;
 153
 154 #ifdef SIGINT
 155                 signal(SIGINT,(void (*)(int))sock_cleanup);
 156 #endif
 157                 wsa_init_done=1;
 158                 memset(&wsa_state,0,sizeof(wsa_state));
 159                 if (WSAStartup(0x0101,&wsa_state)!=0)
 160                         {
 161                         err=WSAGetLastError();
 162                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
 163                         return(0);
 164                         }
 165
 166 #ifdef WIN16
 167                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
 168                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
 169                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
 170
 171                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
 172 #endif /* WIN16 */
 173                 }
 174 #endif /* WINDOWS */
 175         return(1);
 176         }
 177
 178 int init_client(int *sock, char *host, int port)
 179         {
 180         unsigned char ip[4];
 181         short p=0;
 182
 183         if (!host_ip(host,&(ip[0])))
 184                 {
 185                 return(0);
 186                 }
 187         if (p != 0) port=p;
 188         return(init_client_ip(sock,ip,port));
 189         }
 190
 191 static int init_client_ip(int *sock, unsigned char ip[4], int port)
 192         {
 193         unsigned long addr;
 194         struct sockaddr_in them;
 195         int s,i;
 196
 197         if (!sock_init()) return(0);
 198
 199         memset((char *)&them,0,sizeof(them));
 200         them.sin_family=AF_INET;
 201         them.sin_port=htons((unsigned short)port);
 202         addr=(unsigned long)
 203                 ((unsigned long)ip[0]<<24L)|
 204                 ((unsigned long)ip[1]<<16L)|
 205                 ((unsigned long)ip[2]<< 8L)|
 206                 ((unsigned long)ip[3]);
 207         them.sin_addr.s_addr=htonl(addr);
 208
 209         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 210         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 211
 212         i=0;
 213         i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 214         if (i < 0) { perror("keepalive"); return(0); }
 215
 216         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
 217                 { close(s); perror("connect"); return(0); }
 218         *sock=s;
 219         return(1);
 220         }
 221
 222 int do_server(int port, int *ret, int (*cb)(), char *context)
 223         {
 224         int sock;
 225         char *name;
 226         int accept_socket;
 227         int i;
 228
 229         if (!init_server(&accept_socket,port)) return(0);
 230
 231         if (ret != NULL)
 232                 {
 233                 *ret=accept_socket;
 234                 /* return(1);*/
 235                 }
 236         for (;;)
 237                 {
 238                 if (do_accept(accept_socket,&sock,&name) == 0)
 239                         {
 240                         SHUTDOWN(accept_socket);
 241                         return(0);
 242                         }
 243                 i=(*cb)(name,sock, context);
 244                 if (name != NULL) Free(name);
 245                 SHUTDOWN2(sock);
 246                 if (i < 0)
 247                         {
 248                         SHUTDOWN2(accept_socket);
 249                         return(i);
 250                         }
 251                 }
 252         }
 253
 254 static int init_server_long(int *sock, int port, char *ip)
 255         {
 256         int ret=0;
 257         struct sockaddr_in server;
 258         int s= -1,i;
 259
 260         if (!sock_init()) return(0);
 261
 262         memset((char *)&server,0,sizeof(server));
 263         server.sin_family=AF_INET;
 264         server.sin_port=htons((unsigned short)port);
 265         if (ip == NULL)
 266                 server.sin_addr.s_addr=INADDR_ANY;
 267         else
 268 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 269 #ifndef BIT_FIELD_LIMITS
 270                 memcpy(&server.sin_addr.s_addr,ip,4);
 271 #else
 272                 memcpy(&server.sin_addr,ip,4);
 273 #endif
 274         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 275
 276         if (s == INVALID_SOCKET) goto err;
 277 #if defined SOL_SOCKET && defined SO_REUSEADDR
 278                 {
 279                 int j = 1;
 280                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 281                            (void *) &j, sizeof j);
 282                 }
 283 #endif
 284         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 285                 {
 286 #ifndef WINDOWS
 287                 perror("bind");
 288 #endif
 289                 goto err;
 290                 }
 291         /* Make it 128 for linux */
 292         if (listen(s,128) == -1) goto err;
 293         i=0;
 294         *sock=s;
 295         ret=1;
 296 err:
 297         if ((ret == 0) && (s != -1))
 298                 {
 299                 SHUTDOWN(s);
 300                 }
 301         return(ret);
 302         }
 303
 304 static int init_server(int *sock, int port)
 305         {
 306         return(init_server_long(sock, port, NULL));
 307         }
 308
 309 static int do_accept(int acc_sock, int *sock, char **host)
 310         {
 311         int ret,i;
 312         struct hostent *h1,*h2;
 313         static struct sockaddr_in from;
 314         int len;
 315 /*      struct linger ling; */
 316
 317         if (!sock_init()) return(0);
 318
 319 #ifndef WINDOWS
 320 redoit:
 321 #endif
 322
 323         memset((char *)&from,0,sizeof(from));
 324         len=sizeof(from);
 325         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 326          * of type (int *) whereas under other systems it is (void *) if
 327          * you don't have a cast it will choke the compiler: if you do
 328          * have a cast then you can either go for (int *) or (void *).
 329          */
 330         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
 331         if (ret == INVALID_SOCKET)
 332                 {
 333 #ifdef WINDOWS
 334                 i=WSAGetLastError();
 335                 BIO_printf(bio_err,"accept error %d\n",i);
 336 #else
 337                 if (errno == EINTR)
 338                         {
 339                         /*check_timeout(); */
 340                         goto redoit;
 341                         }
 342                 fprintf(stderr,"errno=%d ",errno);
 343                 perror("accept");
 344 #endif
 345                 return(0);
 346                 }
 347
 348 /*
 349         ling.l_onoff=1;
 350         ling.l_linger=0;
 351         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 352         if (i < 0) { perror("linger"); return(0); }
 353         i=0;
 354         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 355         if (i < 0) { perror("keepalive"); return(0); }
 356 */
 357
 358         if (host == NULL) goto end;
 359 #ifndef BIT_FIELD_LIMITS
 360         /* I should use WSAAsyncGetHostByName() under windows */
 361         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
 362                 sizeof(from.sin_addr.s_addr),AF_INET);
 363 #else
 364         h1=gethostbyaddr((char *)&from.sin_addr,
 365                 sizeof(struct in_addr),AF_INET);
 366 #endif
 367         if (h1 == NULL)
 368                 {
 369                 BIO_printf(bio_err,"bad gethostbyaddr\n");
 370                 *host=NULL;
 371                 /* return(0); */
 372                 }
 373         else
 374                 {
 375                 if ((*host=(char *)Malloc(strlen(h1->h_name)+1)) == NULL)
 376                         {
 377                         perror("Malloc");
 378                         return(0);
 379                         }
 380                 strcpy(*host,h1->h_name);
 381
 382                 h2=GetHostByName(*host);
 383                 if (h2 == NULL)
 384                         {
 385                         BIO_printf(bio_err,"gethostbyname failure\n");
 386                         return(0);
 387                         }
 388                 i=0;
 389                 if (h2->h_addrtype != AF_INET)
 390                         {
 391                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 392                         return(0);
 393                         }
 394                 }
 395 end:
 396         *sock=ret;
 397         return(1);
 398         }
 399
 400 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 401              short *port_ptr)
 402         {
 403         char *h,*p;
 404
 405         h=str;
 406         p=strchr(str,':');
 407         if (p == NULL)
 408                 {
 409                 BIO_printf(bio_err,"no port defined\n");
 410                 return(0);
 411                 }
 412         *(p++)='\0';
 413
 414         if ((ip != NULL) && !host_ip(str,ip))
 415                 goto err;
 416         if (host_ptr != NULL) *host_ptr=h;
 417
 418         if (!extract_port(p,port_ptr))
 419                 goto err;
 420         return(1);
 421 err:
 422         return(0);
 423         }
 424
 425 static int host_ip(char *str, unsigned char ip[4])
 426         {
 427         unsigned int in[4];
 428         int i;
 429
 430         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
 431                 {
 432                 for (i=0; i<4; i++)
 433                         if (in[i] > 255)
 434                                 {
 435                                 BIO_printf(bio_err,"invalid IP address\n");
 436                                 goto err;
 437                                 }
 438                 ip[0]=in[0];
 439                 ip[1]=in[1];
 440                 ip[2]=in[2];
 441                 ip[3]=in[3];
 442                 }
 443         else
 444                 { /* do a gethostbyname */
 445                 struct hostent *he;
 446
 447                 if (!sock_init()) return(0);
 448
 449                 he=GetHostByName(str);
 450                 if (he == NULL)
 451                         {
 452                         BIO_printf(bio_err,"gethostbyname failure\n");
 453                         goto err;
 454                         }
 455                 /* cast to short because of win16 winsock definition */
 456                 if ((short)he->h_addrtype != AF_INET)
 457                         {
 458                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 459                         return(0);
 460                         }
 461                 ip[0]=he->h_addr_list[0][0];
 462                 ip[1]=he->h_addr_list[0][1];
 463                 ip[2]=he->h_addr_list[0][2];
 464                 ip[3]=he->h_addr_list[0][3];
 465                 }
 466         return(1);
 467 err:
 468         return(0);
 469         }
 470
 471 int extract_port(char *str, short *port_ptr)
 472         {
 473         int i;
 474         struct servent *s;
 475
 476         i=atoi(str);
 477         if (i != 0)
 478                 *port_ptr=(unsigned short)i;
 479         else
 480                 {
 481                 s=getservbyname(str,"tcp");
 482                 if (s == NULL)
 483                         {
 484                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
 485                         return(0);
 486                         }
 487                 *port_ptr=ntohs((unsigned short)s->s_port);
 488                 }
 489         return(1);
 490         }
 491
 492 #define GHBN_NUM        4
 493 static struct ghbn_cache_st
 494         {
 495         char name[128];
 496         struct hostent ent;
 497         unsigned long order;
 498         } ghbn_cache[GHBN_NUM];
 499
 500 static unsigned long ghbn_hits=0L;
 501 static unsigned long ghbn_miss=0L;
 502
 503 static struct hostent *GetHostByName(char *name)
 504         {
 505         struct hostent *ret;
 506         int i,lowi=0;
 507         unsigned long low= (unsigned long)-1;
 508
 509         for (i=0; i<GHBN_NUM; i++)
 510                 {
 511                 if (low > ghbn_cache[i].order)
 512                         {
 513                         low=ghbn_cache[i].order;
 514                         lowi=i;
 515                         }
 516                 if (ghbn_cache[i].order > 0)
 517                         {
 518                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
 519                                 break;
 520                         }
 521                 }
 522         if (i == GHBN_NUM) /* no hit*/
 523                 {
 524                 ghbn_miss++;
 525                 ret=gethostbyname(name);
 526                 if (ret == NULL) return(NULL);
 527                 /* else add to cache */
 528                 strncpy(ghbn_cache[lowi].name,name,128);
 529                 memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
 530                 ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
 531                 return(ret);
 532                 }
 533         else
 534                 {
 535                 ghbn_hits++;
 536                 ret= &(ghbn_cache[i].ent);
 537                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
 538                 return(ret);
 539                 }
 540         }