/* Copyright (c) 1996-1999 NEC USA, Inc.  All rights reserved.               *//*                                                                           *//* The redistribution, use and modification in source or binary forms of     *//* this software is subject to the conditions set forth in the copyright     *//* document ("COPYRIGHT") included with this distribution.                   */#include "socks5p.h"#include "wrap.h"#include "libproto.h"#include "protocol.h"#include "addr.h"#include "share.h"#define EXITERROR(err)	( perror("ping"), exit((err)) )int main(int argc, char *argv[]) {    S5IOHandle fd;    S5NetAddr rsin;    lsSocksInfo *pcon;    struct hostent *rhp;    if (argc != 2 || *argv[1] == '-') {	fprintf(stderr, "Usage: %s host\n", argv[0]);	exit(-1);    }    if (LIBPREFIX2(init)(NULL) != 0) EXITERROR(-1);    memset((char *)&rsin, 0, sizeof(S5NetAddr));    rsin.sin.sin_family = AF_INET;    if ((rsin.sin.sin_addr.s_addr = inet_addr(argv[1])) == INVALIDADDR) {        if ((rhp = LIBPREFIX(gethostbyname)(argv[1])) == NULL) EXITERROR(-1);        memcpy((char *)&rsin.sin.sin_addr.s_addr, (char *)rhp->h_addr_list[0], rhp->h_length);        rsin.sin.sin_family = rhp->h_addrtype;    }    if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == S5InvalidIOHandle) return -1;    Signal(SIGPIPE, SIG_IGN);    if ((pcon = lsLibProtoExchg(fd, &rsin, SOCKS_PING)) == NULL) {        fprintf(stderr, "lsLibProtoExchg: Protocol exchange failed. \n");	CLOSESOCKET(fd);        return -1;    }    if (!pcon->pri || pcon->pri->how == DIRECT || !lsAddrAddrComp(&rsin, &pcon->pri->prxyin)) {	LIBPREFIX(close)(fd);#ifndef PINGPROG	fprintf(stderr, "Real ping unavailable.\n");	exit(0);#else	execlp(PINGPROG, "ping", argv[1], NULL);	_exit(0);#endif    }    DataRelay(fd, &pcon->pri->cinfo, 0);    LIBPREFIX(close)(fd);    exit(0);}