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