s_socket.c

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/* apps/s_socket.c -  socket-related functions used by s_client and s_server */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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>
#include <signal.h>

#ifdef FLAT_INC
#include "e_os2.h"
#else
#include "../e_os2.h"
#endif

/* 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
#include "../e_os.h"
#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];

    memset(ip, '\0', sizeof ip);
    if (!host_ip(host,&(ip[0])))
        return 0;
    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); }

#if defined(SO_KEEPALIVE) && !defined(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)
        { closesocket(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 = 0;
    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;

    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 ([email protected]) */
#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;
    *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;
    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))
        int i;
        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);
            }
        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