client.cpp

tcp/ip应用实现 保护server/clinet,

#include <sys/socket.h>

#define SERVPORT 3333
#define MAXDATASIZE 100

int main(int argc, char *argv[])
{
	int 	sockfd, recvbyts;
	char	buf[MAXDATASIZE];
	struct hostent *host = NULL;
	struct sockaddr_in serv_addr;
	
	if (argc < 2)
	{
		sprinft(stderr, "please enter the server's hostname!");
		exit(1);
	}
	
	if ((host = gethostbyname(argv[1])) == NULL)
	{
		perror("gethostbyname error");
		exit(-1);
	}
	
	if ((sockfd = socket(AF_INIT, SOCK_STREAM, 0)) == -1)
	{
		perror("socket create error!");
		exit(1);
	}
	
	
	serv_addr.sin_family = AF_INIT;
	serv_addr.sin_port = hots(SERVPORT);
	serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
	bzero(&(serv_addr.sin_zero),8);
	
	if (connect(sockfd, (struct sockaddr_in *)&serv_addr, \
		sizeof(struct sockaddr_in)) == -1)
	{
		perror("connect error!");
		exit(1);
	}
	
	if ((recvbyts = recv(sockfd, buf, MAXDATASIZE, 0)) == -1)
	{
		perror("recv error!");
		exit(1);
	}
	
	buf[MAXDATASIZE]='\0';
	printf("recevie : %s\n", buf);
	close(sockfd);
	
	return 0;
}