/* apps/s_socket.c -  socket-related functions used by s_client and s_server */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

/* With IPv6, it looks like Digital has mixed up the proper order of

   recursive header file inclusion, resulting in the compiler complaining

   that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which

   is needed to have fileno() declared correctly...  So let's define u_int */

#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)

#define __U_INT

typedef unsigned int u_int;

#endif

#define USE_SOCKETS

#define NON_MAIN

#include "apps.h"

#undef USE_SOCKETS

#undef NON_MAIN

#include "s_apps.h"

#include <openssl/ssl.h>

#ifdef FLAT_INC

#include "e_os.h"

#else

#ifndef SYMBIAN

#include "../e_os.h"

#else

#include "e_os.h"

#endif

#endif

#ifndef OPENSSL_NO_SOCK

#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)

#include "netdb.h"

#endif

static struct hostent *GetHostByName(char *name);

#if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))

static void ssl_sock_cleanup(void);

#endif

static int ssl_sock_init(void);

static int init_client_ip(int *sock,unsigned char ip[4], int port, int type);

static int init_server(int *sock, int port, int type);

static int init_server_long(int *sock, int port,char *ip, int type);

static int do_accept(int acc_sock, int *sock, char **host);

static int host_ip(char *str, unsigned char ip[4]);

#ifdef OPENSSL_SYS_WIN16

#define SOCKET_PROTOCOL	0 /* more microsoft stupidity */

#else

#define SOCKET_PROTOCOL	IPPROTO_TCP

#endif

#if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)

static int wsa_init_done=0;

#endif

#ifdef OPENSSL_SYS_WINDOWS

static struct WSAData wsa_state;

static int wsa_init_done=0;

#ifdef OPENSSL_SYS_WIN16

static HWND topWnd=0;

static FARPROC lpTopWndProc=NULL;

static FARPROC lpTopHookProc=NULL;

extern HINSTANCE _hInstance;  /* nice global CRT provides */

static LONG FAR PASCAL topHookProc(HWND hwnd, UINT message, WPARAM wParam,

	     LPARAM lParam)

	{

	if (hwnd == topWnd)

		{

		switch(message)

			{

		case WM_DESTROY:

		case WM_CLOSE:

			SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopWndProc);

			ssl_sock_cleanup();

			break;

			}

		}

	return CallWindowProc(lpTopWndProc,hwnd,message,wParam,lParam);

	}

static BOOL CALLBACK enumproc(HWND hwnd,LPARAM lParam)

	{

	topWnd=hwnd;

	return(FALSE);

	}

#endif /* OPENSSL_SYS_WIN32 */

#endif /* OPENSSL_SYS_WINDOWS */

#ifdef OPENSSL_SYS_WINDOWS

static void ssl_sock_cleanup(void)

	{

	if (wsa_init_done)

		{

		wsa_init_done=0;

#ifndef OPENSSL_SYS_WINCE

		WSACancelBlockingCall();

#endif

		WSACleanup();

		}

	}

#elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)

static void sock_cleanup(void)

    {

    if (wsa_init_done)

        {

        wsa_init_done=0;

		WSACleanup();

		}

	}

#endif

static int ssl_sock_init(void)

	{

#ifdef WATT32

	extern int _watt_do_exit;

	_watt_do_exit = 0;

	if (sock_init())

		return (0);

#elif defined(OPENSSL_SYS_WINDOWS)

	if (!wsa_init_done)

		{

		int err;

#ifdef SIGINT

	//	signal(SIGINT,(void (*)(int))ssl_sock_cleanup);

#endif

		wsa_init_done=1;

		memset(&wsa_state,0,sizeof(wsa_state));

		if (WSAStartup(0x0101,&wsa_state)!=0)

			{

			err=WSAGetLastError();

			BIO_printf(bio_err,"unable to start WINSOCK, error code=%d\n",err);

			return(0);

			}

#ifdef OPENSSL_SYS_WIN16

		EnumTaskWindows(GetCurrentTask(),enumproc,0L);

		lpTopWndProc=(FARPROC)GetWindowLong(topWnd,GWL_WNDPROC);

		lpTopHookProc=MakeProcInstance((FARPROC)topHookProc,_hInstance);

		SetWindowLong(topWnd,GWL_WNDPROC,(LONG)lpTopHookProc);

#endif /* OPENSSL_SYS_WIN16 */

		}

#elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)

   WORD wVerReq;

   WSADATA wsaData;

   int err;

   if (!wsa_init_done)

      {

# ifdef SIGINT

    //  signal(SIGINT,(void (*)(int))sock_cleanup);

# endif

      wsa_init_done=1;

      wVerReq = MAKEWORD( 2, 0 );

      err = WSAStartup(wVerReq,&wsaData);

      if (err != 0)

         {

         BIO_printf(bio_err,"unable to start WINSOCK2, error code=%d\n",err);

         return(0);

         }

      }

#endif /* OPENSSL_SYS_WINDOWS */

	return(1);

	}

int init_client(int *sock, char *host, int port, int type)

	{

	unsigned char ip[4];

	short p=0;

	if (!host_ip(host,&(ip[0])))

		{

		return(0);

		}

	if (p != 0) port=p;

	return(init_client_ip(sock,ip,port,type));

	}

static int init_client_ip(int *sock, unsigned char ip[4], int port, int type)

	{

	unsigned long addr;

	struct sockaddr_in them;

	int s,i;

	if (!ssl_sock_init()) return(0);

	memset((char *)&them,0,sizeof(them));

	them.sin_family=AF_INET;

	them.sin_port=htons((unsigned short)port);

	addr=(unsigned long)

		((unsigned long)ip[0]<<24L)|

		((unsigned long)ip[1]<<16L)|

		((unsigned long)ip[2]<< 8L)|

		((unsigned long)ip[3]);

	them.sin_addr.s_addr=htonl(addr);

	if (type == SOCK_STREAM)

		s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);

	else /* ( type == SOCK_DGRAM) */

		s=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);

	if (s == INVALID_SOCKET) { perror("socket"); return(0); }

#ifndef OPENSSL_SYS_MPE

	if (type == SOCK_STREAM)

		{

		i=0;

		i=setsockopt(s,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));

		if (i < 0) { perror("keepalive"); return(0); }

		}

#endif

	if (connect(s,(struct sockaddr *)&them,sizeof(them)) == -1)

		{ close(s); perror("connect"); return(0); }

	*sock=s;

	return(1);

	}

int do_server(int port, int type, int *ret, int (*cb)(char *hostname, int s, unsigned char *context), unsigned char *context)

	{

	int sock;

	char *name = NULL;

	int accept_socket;

	int i;

	if (!init_server(&accept_socket,port,type)) return(0);

	if (ret != NULL)

		{

		*ret=accept_socket;

		/* return(1);*/

		}

  	for (;;)

  		{

		if (type==SOCK_STREAM)

			{

			if (do_accept(accept_socket,&sock,&name) == 0)

				{

				SHUTDOWN(accept_socket);

				return(0);

				}

			}

		else

			sock = accept_socket;

		i=(*cb)(name,sock, context);

		if (name != NULL) OPENSSL_free(name);

		if (type==SOCK_STREAM)

			SHUTDOWN2(sock);

		if (i < 0)

			{

			SHUTDOWN2(accept_socket);

			return(i);

			}

		}

	}

static int init_server_long(int *sock, int port, char *ip, int type)

	{

	int ret=0;

	struct sockaddr_in server;

	int s= -1,i;

	if (!ssl_sock_init()) return(0);

	memset((char *)&server,0,sizeof(server));

	server.sin_family=AF_INET;

	server.sin_port=htons((unsigned short)port);

	if (ip == NULL)

		server.sin_addr.s_addr=INADDR_ANY;

	else

/* Added for T3E, address-of fails on bit field (beckman@acl.lanl.gov) */

#ifndef BIT_FIELD_LIMITS

		memcpy(&server.sin_addr.s_addr,ip,4);

#else

		memcpy(&server.sin_addr,ip,4);

#endif

		if (type == SOCK_STREAM)

			s=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);

		else /* type == SOCK_DGRAM */

			s=socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP);

	if (s == INVALID_SOCKET) goto err;

#if defined SOL_SOCKET && defined SO_REUSEADDR

		{

		int j = 1;

		setsockopt(s, SOL_SOCKET, SO_REUSEADDR,

			   (void *) &j, sizeof j);

		}

#endif

	if (bind(s,(struct sockaddr *)&server,sizeof(server)) == -1)

		{

#ifndef OPENSSL_SYS_WINDOWS

		perror("bind");

#endif

		goto err;

		}

	/* Make it 128 for linux */

	if (type==SOCK_STREAM && listen(s,128) == -1) goto err;

	i=0;

	*sock=s;

	ret=1;

err:

	if ((ret == 0) && (s != -1))

		{

		SHUTDOWN(s);

		}

	return(ret);

	}

static int init_server(int *sock, int port, int type)

	{

	return(init_server_long(sock, port, NULL, type));

	}

static int do_accept(int acc_sock, int *sock, char **host)

	{

	int ret,i;

	struct hostent *h1,*h2;

	static struct sockaddr_in from;

	int len;

/*	struct linger ling; */

	if (!ssl_sock_init()) return(0);

#ifndef OPENSSL_SYS_WINDOWS

redoit:

#endif

	memset((char *)&from,0,sizeof(from));

	len=sizeof(from);

	/* Note: under VMS with SOCKETSHR the fourth parameter is currently

	 * of type (int *) whereas under other systems it is (void *) if

	 * you don't have a cast it will choke the compiler: if you do

	 * have a cast then you can either go for (int *) or (void *).

	 */

	ret=accept(acc_sock,(struct sockaddr *)&from,(void *)&len);

	if (ret == INVALID_SOCKET)

		{

#if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))

		i=WSAGetLastError();

		BIO_printf(bio_err,"accept error %d\n",i);

#else

		if (errno == EINTR)

			{

			/*check_timeout(); */

			goto redoit;

			}

		fprintf(stderr,"errno=%d ",errno);

//		perror("accept");

#endif

		return(0);

		}

/*

	ling.l_onoff=1;

	ling.l_linger=0;

	i=setsockopt(ret,SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling));

	if (i < 0) { perror("linger"); return(0); }

	i=0;

	i=setsockopt(ret,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));

	if (i < 0) { perror("keepalive"); return(0); }

*/

	if (host == NULL) goto end;

#ifndef BIT_FIELD_LIMITS

	/* I should use WSAAsyncGetHostByName() under windows */

	h1=gethostbyaddr((char *)&from.sin_addr.s_addr,

		sizeof(from.sin_addr.s_addr),AF_INET);

#else

	h1=gethostbyaddr((char *)&from.sin_addr,

		sizeof(struct in_addr),AF_INET);

#endif

	if (h1 == NULL)

		{

		BIO_printf(bio_err,"bad gethostbyaddr\n");

		*host=NULL;

		/* return(0); */

		}

	else

		{

		if ((*host=(char *)OPENSSL_malloc(strlen(h1->h_name)+1)) == NULL)

			{

			perror("OPENSSL_malloc");

			return(0);

			}

		BUF_strlcpy(*host,h1->h_name,strlen(h1->h_name)+1);

		h2=GetHostByName(*host);

		if (h2 == NULL)

			{

			BIO_printf(bio_err,"gethostbyname failure\n");

			return(0);

			}

		i=0;

		if (h2->h_addrtype != AF_INET)

			{

			BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");

			return(0);

			}

		}

end:

	*sock=ret;

	return(1);

	}

int extract_host_port(char *str, char **host_ptr, unsigned char *ip,

	     short *port_ptr)

	{

	char *h,*p;

	h=str;

	p=strchr(str,':');

	if (p == NULL)

		{

		BIO_printf(bio_err,"no port defined\n");

		return(0);

		}

	*(p++)='\0';

	if ((ip != NULL) && !host_ip(str,ip))

		goto err;

	if (host_ptr != NULL) *host_ptr=h;

	if (!extract_port(p,port_ptr))

		goto err;

	return(1);

err:

	return(0);

	}

static int host_ip(char *str, unsigned char ip[4])

	{

	unsigned int in[4]; 

	int i;

	if (sscanf(str,"%u.%u.%u.%u",&(in[0]),&(in[1]),&(in[2]),&(in[3])) == 4)

		{

		for (i=0; i<4; i++)

			if (in[i] > 255)

				{

				BIO_printf(bio_err,"invalid IP address\n");

				goto err;

				}

		ip[0]=in[0];

		ip[1]=in[1];

		ip[2]=in[2];

		ip[3]=in[3];

		}

	else

		{ /* do a gethostbyname */

		struct hostent *he;

		if (!ssl_sock_init()) return(0);

		he=GetHostByName(str);

		if (he == NULL)

			{

			BIO_printf(bio_err,"gethostbyname failure\n");

			goto err;

			}

		/* cast to short because of win16 winsock definition */

		if ((short)he->h_addrtype != AF_INET)

			{

			BIO_printf(bio_err,"gethostbyname addr is not AF_INET\n");

			return(0);

			}

		ip[0]=he->h_addr_list[0][0];

		ip[1]=he->h_addr_list[0][1];

		ip[2]=he->h_addr_list[0][2];

		ip[3]=he->h_addr_list[0][3];

		}

	return(1);

err:

	return(0);

	}

int extract_port(char *str, short *port_ptr)

	{

	int i;

	struct servent *s;

	i=atoi(str);

	if (i != 0)

		*port_ptr=(unsigned short)i;

	else

		{

		s=getservbyname(str,"tcp");

		if (s == NULL)

			{

			BIO_printf(bio_err,"getservbyname failure for %s\n",str);

			return(0);

			}

		*port_ptr=ntohs((unsigned short)s->s_port);

		}

	return(1);

	}

#define GHBN_NUM	4

static struct ghbn_cache_st

	{

	char name[128];

	struct hostent ent;

	unsigned long order;

	} ghbn_cache[GHBN_NUM];

static unsigned long ghbn_hits=0L;

static unsigned long ghbn_miss=0L;

static struct hostent *GetHostByName(char *name)

	{

	struct hostent *ret;

	int i,lowi=0;

	unsigned long low= (unsigned long)-1;

	for (i=0; i<GHBN_NUM; i++)

		{

		if (low > ghbn_cache[i].order)

			{

			low=ghbn_cache[i].order;

			lowi=i;

			}

		if (ghbn_cache[i].order > 0)

			{

			if (strncmp(name,ghbn_cache[i].name,128) == 0)

				break;

			}

		}

	if (i == GHBN_NUM) /* no hit*/

		{

		ghbn_miss++;

		ret=gethostbyname(name);

		if (ret == NULL) return(NULL);

		/* else add to cache */

		if(strlen(name) < sizeof ghbn_cache[0].name)

			{

			strcpy(ghbn_cache[lowi].name,name);

			memcpy((char *)&(ghbn_cache[lowi].ent),ret,sizeof(struct hostent));

			ghbn_cache[lowi].order=ghbn_miss+ghbn_hits;

			}

		return(ret);

		}

	else

		{

		ghbn_hits++;

		ret= &(ghbn_cache[i].ent);

		ghbn_cache[i].order=ghbn_miss+ghbn_hits;

		return(ret);

		}

	}

#endif