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