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 #define USE_SOCKETS
  66 #define NON_MAIN
  67 #include "apps.h"
  68 #undef USE_SOCKETS
  69 #undef NON_MAIN
  70 #include "s_apps.h"
  71 #include <openssl/ssl.h>
  72 #include <openssl/e_os2.h>
  73
  74 /* With IPv6, it looks like Digital has mixed up the proper order of
  75    recursive header file inclusion, resulting in the compiler complaining
  76    that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
  77    is needed to have fileno() declared correctly...  So let's define u_int */
  78 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
  79 #define __U_INT
  80 typedef unsigned int u_int;
  81 #endif
  82
  83 static struct hostent *GetHostByName(char *name);
  84 #ifdef OPENSSL_SYS_WINDOWS
  85 static void sock_cleanup(void);
  86 #endif
  87 static int sock_init(void);
  88 static int init_client_ip(int *sock,unsigned char ip[4], int port);
  89 static int init_server(int *sock, int port);
  90 static int init_server_long(int *sock, int port,char *ip);
  91 static int do_accept(int acc_sock, int *sock, char **host);
  92 static int host_ip(char *str, unsigned char ip[4]);
  93
  94 #ifdef OPENSSL_SYS_WIN16
  95 #define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
  96 #else
  97 #define SOCKET_PROTOCOL IPPROTO_TCP
  98 #endif
  99
 100 #ifdef OPENSSL_SYS_WINDOWS
 101 static struct WSAData wsa_state;
 102 static int wsa_init_done=0;
 103
 104 #ifdef OPENSSL_SYS_WIN16
 105 static HWND topWnd=0;
 106 static FARPROC lpTopWndProc=NULL;
 107 static FARPROC lpTopHookProc=NULL;
 108 extern HINSTANCE _hInstance;  /* nice global CRT provides */
 109
 110 static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,
 111              LPARAM lParam)
 112         {
 113         if (hwnd == topWnd)
 114                 {
 115                 switch(message)
 116                         {
 117                 case WM_DESTROY:
 118                 case WM_CLOSE:
 119                         SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);
 120                         sock_cleanup();
 121                         break;
 122                         }
 123                 }
 124         return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);
 125         }
 126
 127 static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)
 128         {
 129         topWnd=hwnd;
 130         return(FALSE);
 131         }
 132
 133 #endif /* OPENSSL_SYS_WIN32 */
 134 #endif /* OPENSSL_SYS_WINDOWS */
 135
 136 #ifdef OPENSSL_SYS_WINDOWS
 137 static void sock_cleanup(void)
 138         {
 139         if (wsa_init_done)
 140                 {
 141                 wsa_init_done=0;
 142                 WSACancelBlockingCall();
 143                 WSACleanup();
 144                 }
 145         }
 146 #endif
 147
 148 static int sock_init(void)
 149         {
 150 #ifdef OPENSSL_SYS_WINDOWS
 151         if (!wsa_init_done)
 152                 {
 153                 int err;
 154
 155 #ifdef SIGINT
 156                 signal(SIGINT,(void (*)(int))sock_cleanup);
 157 #endif
 158                 wsa_init_done=1;
 159                 memset(&wsa_state,0,sizeof(wsa_state));
 160                 if (WSAStartup(0x0101,&wsa_state)!=0)
 161                         {
 162                         err=WSAGetLastError();
 163                         BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);
 164                         return(0);
 165                         }
 166
 167 #ifdef OPENSSL_SYS_WIN16
 168                 EnumTaskWindows(GetCurrentTask(),enumproc,0L);
 169                 lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);
 170                 lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);
 171
 172                 SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);
 173 #endif /* OPENSSL_SYS_WIN16 */
 174                 }
 175 #endif /* OPENSSL_SYS_WINDOWS */
 176         return(1);
 177         }
 178
 179 int init_client(int *sock, char *host, int port)
 180         {
 181         unsigned char ip[4];
 182         short p=0;
 183
 184         if (!host_ip(host,&(ip[0])))
 185                 {
 186                 return(0);
 187                 }
 188         if (p != 0) port=p;
 189         return(init_client_ip(sock,ip,port));
 190         }
 191
 192 static int init_client_ip(int *sock, unsigned char ip[4], int port)
 193         {
 194         unsigned long addr;
 195         struct sockaddr_in them;
 196         int s,i;
 197
 198         if (!sock_init()) return(0);
 199
 200         memset((char *)&them,0,sizeof(them));
 201         them.sin_family=AF_INET;
 202         them.sin_port=htons((unsigned short)port);
 203         addr=(unsigned long)
 204                 ((unsigned long)ip[0]<<24L)|
 205                 ((unsigned long)ip[1]<<16L)|
 206                 ((unsigned long)ip[2]<< 8L)|
 207                 ((unsigned long)ip[3]);
 208         them.sin_addr.s_addr=htonl(addr);
 209
 210         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 211         if (s == INVALID_SOCKET) { perror("socket"); return(0); }
 212
 213 #ifndef OPENSSL_SYS_MPE
 214         i=0;
 215         i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 216         if (i < 0) { perror("keepalive"); return(0); }
 217 #endif
 218
 219         if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)
 220                 { close(s); perror("connect"); return(0); }
 221         *sock=s;
 222         return(1);
 223         }
 224
 225 int do_server(int port, int *ret, int (*cb)(), char *context)
 226         {
 227         int sock;
 228         char *name;
 229         int accept_socket;
 230         int i;
 231
 232         if (!init_server(&accept_socket,port)) return(0);
 233
 234         if (ret != NULL)
 235                 {
 236                 *ret=accept_socket;
 237                 /* return(1);*/
 238                 }
 239         for (;;)
 240                 {
 241                 if (do_accept(accept_socket,&sock,&name) == 0)
 242                         {
 243                         SHUTDOWN(accept_socket);
 244                         return(0);
 245                         }
 246                 i=(*cb)(name,sock, context);
 247                 if (name != NULL) OPENSSL_free(name);
 248                 SHUTDOWN2(sock);
 249                 if (i < 0)
 250                         {
 251                         SHUTDOWN2(accept_socket);
 252                         return(i);
 253                         }
 254                 }
 255         }
 256
 257 static int init_server_long(int *sock, int port, char *ip)
 258         {
 259         int ret=0;
 260         struct sockaddr_in server;
 261         int s= -1,i;
 262
 263         if (!sock_init()) return(0);
 264
 265         memset((char *)&server,0,sizeof(server));
 266         server.sin_family=AF_INET;
 267         server.sin_port=htons((unsigned short)port);
 268         if (ip == NULL)
 269                 server.sin_addr.s_addr=INADDR_ANY;
 270         else
 271 /* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */
 272 #ifndef BIT_FIELD_LIMITS
 273                 memcpy(&server.sin_addr.s_addr,ip,4);
 274 #else
 275                 memcpy(&server.sin_addr,ip,4);
 276 #endif
 277         s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
 278
 279         if (s == INVALID_SOCKET) goto err;
 280 #if defined SOL_SOCKET && defined SO_REUSEADDR
 281                 {
 282                 int j = 1;
 283                 setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
 284                            (void *) &j, sizeof j);
 285                 }
 286 #endif
 287         if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)
 288                 {
 289 #ifndef OPENSSL_SYS_WINDOWS
 290                 perror("bind");
 291 #endif
 292                 goto err;
 293                 }
 294         /* Make it 128 for linux */
 295         if (listen(s,128) == -1) goto err;
 296         i=0;
 297         *sock=s;
 298         ret=1;
 299 err:
 300         if ((ret == 0) && (s != -1))
 301                 {
 302                 SHUTDOWN(s);
 303                 }
 304         return(ret);
 305         }
 306
 307 static int init_server(int *sock, int port)
 308         {
 309         return(init_server_long(sock, port, NULL));
 310         }
 311
 312 static int do_accept(int acc_sock, int *sock, char **host)
 313         {
 314         int ret,i;
 315         struct hostent *h1,*h2;
 316         static struct sockaddr_in from;
 317         int len;
 318 /*      struct linger ling; */
 319
 320         if (!sock_init()) return(0);
 321
 322 #ifndef OPENSSL_SYS_WINDOWS
 323 redoit:
 324 #endif
 325
 326         memset((char *)&from,0,sizeof(from));
 327         len=sizeof(from);
 328         /* Note: under VMS with SOCKETSHR the fourth parameter is currently
 329          * of type (int *) whereas under other systems it is (void *) if
 330          * you don't have a cast it will choke the compiler: if you do
 331          * have a cast then you can either go for (int *) or (void *).
 332          */
 333         ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);
 334         if (ret == INVALID_SOCKET)
 335                 {
 336 #ifdef OPENSSL_SYS_WINDOWS
 337                 i=WSAGetLastError();
 338                 BIO_printf(bio_err,"accept error %d\n",i);
 339 #else
 340                 if (errno == EINTR)
 341                         {
 342                         /*check_timeout(); */
 343                         goto redoit;
 344                         }
 345                 fprintf(stderr,"errno=%d ",errno);
 346                 perror("accept");
 347 #endif
 348                 return(0);
 349                 }
 350
 351 /*
 352         ling.l_onoff=1;
 353         ling.l_linger=0;
 354         i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));
 355         if (i < 0) { perror("linger"); return(0); }
 356         i=0;
 357         i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
 358         if (i < 0) { perror("keepalive"); return(0); }
 359 */
 360
 361         if (host == NULL) goto end;
 362 #ifndef BIT_FIELD_LIMITS
 363         /* I should use WSAAsyncGetHostByName() under windows */
 364         h1=gethostbyaddr((char *)&from.sin_addr.s_addr,
 365                 sizeof(from.sin_addr.s_addr),AF_INET);
 366 #else
 367         h1=gethostbyaddr((char *)&from.sin_addr,
 368                 sizeof(struct in_addr),AF_INET);
 369 #endif
 370         if (h1 == NULL)
 371                 {
 372                 BIO_printf(bio_err,"bad gethostbyaddr\n");
 373                 *host=NULL;
 374                 /* return(0); */
 375                 }
 376         else
 377                 {
 378                 if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)
 379                         {
 380                         perror("OPENSSL_malloc");
 381                         return(0);
 382                         }
 383                 strcpy(*host,h1->h_name);
 384
 385                 h2=GetHostByName(*host);
 386                 if (h2 == NULL)
 387                         {
 388                         BIO_printf(bio_err,"gethostbyname failure\n");
 389                         return(0);
 390                         }
 391                 i=0;
 392                 if (h2->h_addrtype != AF_INET)
 393                         {
 394                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 395                         return(0);
 396                         }
 397                 }
 398 end:
 399         *sock=ret;
 400         return(1);
 401         }
 402
 403 int extract_host_port(char *str, char **host_ptr, unsigned char *ip,
 404              short *port_ptr)
 405         {
 406         char *h,*p;
 407
 408         h=str;
 409         p=strchr(str,':');
 410         if (p == NULL)
 411                 {
 412                 BIO_printf(bio_err,"no port defined\n");
 413                 return(0);
 414                 }
 415         *(p++)='\0';
 416
 417         if ((ip != NULL) && !host_ip(str,ip))
 418                 goto err;
 419         if (host_ptr != NULL) *host_ptr=h;
 420
 421         if (!extract_port(p,port_ptr))
 422                 goto err;
 423         return(1);
 424 err:
 425         return(0);
 426         }
 427
 428 static int host_ip(char *str, unsigned char ip[4])
 429         {
 430         unsigned int in[4];
 431         int i;
 432
 433         if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)
 434                 {
 435                 for (i=0; i<4; i++)
 436                         if (in[i] > 255)
 437                                 {
 438                                 BIO_printf(bio_err,"invalid IP address\n");
 439                                 goto err;
 440                                 }
 441                 ip[0]=in[0];
 442                 ip[1]=in[1];
 443                 ip[2]=in[2];
 444                 ip[3]=in[3];
 445                 }
 446         else
 447                 { /* do a gethostbyname */
 448                 struct hostent *he;
 449
 450                 if (!sock_init()) return(0);
 451
 452                 he=GetHostByName(str);
 453                 if (he == NULL)
 454                         {
 455                         BIO_printf(bio_err,"gethostbyname failure\n");
 456                         goto err;
 457                         }
 458                 /* cast to short because of win16 winsock definition */
 459                 if ((short)he->h_addrtype != AF_INET)
 460                         {
 461                         BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");
 462                         return(0);
 463                         }
 464                 ip[0]=he->h_addr_list[0][0];
 465                 ip[1]=he->h_addr_list[0][1];
 466                 ip[2]=he->h_addr_list[0][2];
 467                 ip[3]=he->h_addr_list[0][3];
 468                 }
 469         return(1);
 470 err:
 471         return(0);
 472         }
 473
 474 int extract_port(char *str, short *port_ptr)
 475         {
 476         int i;
 477         struct servent *s;
 478
 479         i=atoi(str);
 480         if (i != 0)
 481                 *port_ptr=(unsigned short)i;
 482         else
 483                 {
 484                 s=getservbyname(str,"tcp");
 485                 if (s == NULL)
 486                         {
 487                         BIO_printf(bio_err,"getservbyname failure for %s\n",str);
 488                         return(0);
 489                         }
 490                 *port_ptr=ntohs((unsigned short)s->s_port);
 491                 }
 492         return(1);
 493         }
 494
 495 #define GHBN_NUM        4
 496 static struct ghbn_cache_st
 497         {
 498         char name[128];
 499         struct hostent ent;
 500         unsigned long order;
 501         } ghbn_cache[GHBN_NUM];
 502
 503 static unsigned long ghbn_hits=0L;
 504 static unsigned long ghbn_miss=0L;
 505
 506 static struct hostent *GetHostByName(char *name)
 507         {
 508         struct hostent *ret;
 509         int i,lowi=0;
 510         unsigned long low= (unsigned long)-1;
 511
 512         for (i=0; i<GHBN_NUM; i++)
 513                 {
 514                 if (low > ghbn_cache[i].order)
 515                         {
 516                         low=ghbn_cache[i].order;
 517                         lowi=i;
 518                         }
 519                 if (ghbn_cache[i].order > 0)
 520                         {
 521                         if (strncmp(name,ghbn_cache[i].name,128) == 0)
 522                                 break;
 523                         }
 524                 }
 525         if (i == GHBN_NUM) /* no hit*/
 526                 {
 527                 ghbn_miss++;
 528                 ret=gethostbyname(name);
 529                 if (ret == NULL) return(NULL);
 530                 /* else add to cache */
 531                 strncpy(ghbn_cache[lowi].name,name,128);
 532                 memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));
 533                 ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;
 534                 return(ret);
 535                 }
 536         else
 537                 {
 538                 ghbn_hits++;
 539                 ret= &(ghbn_cache[i].ent);
 540                 ghbn_cache[i].order=ghbn_miss+ghbn_hits;
 541                 return(ret);
 542                 }
 543         }