server.c

基于Linux上一个简单的UDP数据收发程序

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <stdbool.h>

char *copyright = "UDP SERVER		CopyRight:2008-04 xWorld\n\
=========================================================";

short int srv_port = 7789;
/********************************/
int main(int argc, char * argv[])
{
	printf("%s\n", copyright);	

	int sockfd;
	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
	if (sockfd == -1) {
		printf("Error 01: sockfd ");
		exit(-1);
	}

	struct sockaddr_in	server,their;
	server.sin_family = AF_INET;
	server.sin_port	= htons(srv_port);
	server.sin_addr.s_addr = INADDR_ANY;
	memset(server.sin_zero, '\0', 8);

	bind(sockfd, (struct sockaddr *)&server, sizeof(struct sockaddr));

	printf("bind ip:%s\tport:%i\n",inet_ntoa(server.sin_addr.s_addr), srv_port);

	char buf[4096];
	int resize, the_len;
	the_len = sizeof(struct sockaddr);
	while(true){
		resize = recvfrom(sockfd, buf, sizeof(buf)-1, 0,
						(struct sockaddr *)&their, &the_len);	

		printf("%s\n", buf);
		printf("\t\t%s\n", inet_ntoa(their.sin_addr));
	}

	close(sockfd);
	return 0;
}