#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <signal.h> #ifdef WIN32#include <winsock.h>#define     WINSOCK_VERSION   MAKEWORD(2,0) #else#include <linux/types.h>#include <sys/select.h>#include <sys/socket.h>#include <linux/in.h>#endif#include "kshmain.h"int inet_pton(int af, const char *src, void *dst);static int inet_pton4(const char *src, u_char *dst);#define EAFNOSUPPORT 47#define INADDRSZ 4#define KSH_SVR_PORT 7915int still_loop = 1;extern int errno;int ksh_connect(char * ipaddr, int port){    int socket_fd;     struct sockaddr_in sin;    int error = 0;#ifdef WIN32    WSADATA wsaData;    if(WSAStartup(WINSOCK_VERSION,&wsaData))     {        printf("Winsock init failed!");        return -1;    }    #endif     sin.sin_family	     = AF_INET;    sin.sin_addr.s_addr = inet_addr(ipaddr);    sin.sin_port         = htons(KSH_SVR_PORT);    /* Create the socket.  */     socket_fd = socket (AF_INET, SOCK_STREAM, 0);     if(socket_fd <= 0){        printf("create socket failed, socket_fd = %d\n", socket_fd);        return -1;    }    /* Connect the socket.   */    error = connect (socket_fd, (struct sockaddr*)&sin, sizeof(struct sockaddr_in));     if(error){        printf("connect failed, error = %d\n", error);        return -1;    }else{        printf("connect ok\n");    }            return socket_fd;     }int main(int argc, char *argv[]){    char usr_input[MAX_CMD_LEN] = {0};    fd_set fds, stdin_fd;    int socket_fd = -1, max_fd;    struct timeval timeout;    int res, ipaddr;        char buffer[4050];        if(argc != 2)    {        printf("usage  : ksh IP\n");        printf("example: ksh 192.168.1.1\n");        return -1;    }         if(inet_pton(AF_INET, argv[1], &ipaddr) <= 0 ){        printf("Invalid IP address!\n");        return -1;    }        FD_ZERO(&fds);    FD_ZERO(&stdin_fd);    socket_fd = ksh_connect(argv[1], KSH_SVR_PORT);    if(socket_fd < 0){        return -1;    }             printf("%s", CLI_PROMPT);        while(still_loop)    {        FD_ZERO(&fds);        FD_SET(socket_fd, &fds);        FD_SET(0, &stdin_fd);             	timeout.tv_sec = 0;    	timeout.tv_usec = 0;                   	/*linux和win下的select函數(shù)區(qū)別很大         *win下的select只能用于socket fd         *linux下的select能用于各種fd         */        res = select(max_fd+1, &fds, NULL, NULL, &timeout);        if(res > 0){            if(FD_ISSET(socket_fd, &fds)){                /*read socket*/                int len = recv(socket_fd, buffer, sizeof(buffer), 0);                if(len > 0 && len < 4050){                    buffer[len] = 0;                    printf("%s\n", buffer);                }else{                    printf("something error happened, exit ksh\n");                    break;                }                printf("%s", CLI_PROMPT);            }        }        /*判斷鍵盤是否有輸入, 串口終端怎么辦?*/        if(kbhit()){               int len = 0;                usr_input[0] = '\0';                fgets(usr_input, MAX_CMD_LEN-1, stdin);                //printf("usr input:%s\n", usr_input);                len = strlen(usr_input);                usr_input[len-1] = 0;                if( (len-1) > 0){                    send(socket_fd, usr_input, len, 0);                }else{                                    printf("%s", CLI_PROMPT);                             }        }            }    close(socket_fd);#ifdef WIN32    WSACleanup();#endif        return 0;}/*********************************copy from inet_pton.c*********************************************//* int * inet_pton(af, src, dst) *	convert from presentation format (which usually means ASCII printable) *	to network format (which is usually some kind of binary format). * return: *	1 if the address was valid for the specified address family *	0 if the address wasn't valid (`dst' is untouched in this case) *	-1 if some other error occurred (`dst' is untouched in this case, too) * author: *	Paul Vixie, 1996. */intinet_pton(af, src, dst)	int af;	const char *src;	void *dst;{	switch (af) {	case AF_INET:		return (inet_pton4(src, dst));	/* I'm lazy, comment this	case AF_INET6:		return (inet_pton6(src, dst));	*/	default:		errno = EAFNOSUPPORT;		return (-1);	}	/* NOTREACHED */}/* int * inet_pton4(src, dst) *	like inet_aton() but without all the hexadecimal and shorthand. * return: *	1 if `src' is a valid dotted quad, else 0. * notice: *	does not touch `dst' unless it's returning 1. * author: *	Paul Vixie, 1996. */static intinet_pton4(src, dst)	const char *src;	u_char *dst;{	static const char digits[] = "0123456789";	int saw_digit, octets, ch;	u_char tmp[INADDRSZ], *tp;	saw_digit = 0;	octets = 0;	*(tp = tmp) = 0;	while ((ch = *src++) != '\0') {		const char *pch;		if ((pch = strchr(digits, ch)) != NULL) {			u_int new = *tp * 10 + (pch - digits);			if (new > 255)				return (0);			*tp = new;			if (! saw_digit) {				if (++octets > 4)					return (0);				saw_digit = 1;			}		} else if (ch == '.' && saw_digit) {			if (octets == 4)				return (0);			*++tp = 0;			saw_digit = 0;		} else			return (0);	}	if (octets < 4)		return (0);	memcpy(dst, tmp, INADDRSZ);	return (1);}/*******************************copy end*****************************************/