/*server.c*/
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
main(){
int sock;
struct sockaddr_in server,client;
int recvd,snd;
int structlength;
char * server_ip = "128.168.10.1";/*server ip address*/
int port = 8888;
char recvbuf[2000],sendbuf[2000];
char str1[]="I have received:\n";
memset((char *)&server,0,sizeof(server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr(server_ip);
server.sin_port = htons(port);
memset((char *)&client,0,sizeof(client));
client.sin_family = AF_INET;
client.sin_addr.s_addr = htonl(INADDR_ANY);
client.sin_port = htons(port);
if((sock = socket (AF_INET,SOCK_DGRAM,0)) < 0 ){
printf("socket create error!\n");
exit(1);
}
structlength = sizeof(server);
if( bind(sock,(struct sockaddr *) &server,structlength) < 0){
printf("socket bind error!\n");
perror("bind");
exit(1);
}
while(1){
structlength = sizeof(client);
printf("waiting.......\n");
recvd = recvfrom(sock,recvbuf,sizeof(recvbuf),0,
(struct sockaddr *) & client,&structlength);
if(recvd < 0){
perror("recvfrom");
exit(EXIT_FAILURE);
}
else{
printf("received:%s\n",recvbuf);
memset(sendbuf,0,strlen(sendbuf));
memcpy(sendbuf,str1,strlen(str1));
snd = sendto(sock,sendbuf,strlen(str1),0,
(struct sockaddr *) &client,structlength);
if(snd < 0){
perror("sendto");
exit(1);
}
printf("sendok!\n");
}
}
close(sock);
}
/*
gcc -o server server.c生成server程序，在服务器端运行./server
*/
/*client.php*/
<?php
$server_ip="128.168.10.1";
$port = 8888;
$sock=@socket_create(AF_INET,SOCK_DGRAM,0);
if(!$sock){
echo "socket create failure";
}
if($buf=="")
$buf="hello,how are you!\n";
if(!@socket_sendto($sock,$buf,strlen($buf),0,"128.168.10.1",8888)){
echo "send error\n";
socket_close($sock);
exit();
}
$buf="";
$msg="";
if(!@socket_recvfrom($sock,$msg,256,0,&$server_ip,&$port)){
echo "recvieve error!";
socket_close($sock);
exit();
}
echo trim($msg)."\n";
socket_close($sock);
?>
<form action="client.php" method="post">
<input type=text name=buf>
<input type=submit value="submit">
</form>
/*这个过程很简单，就是客户端提交一个信息，服务端接收，
并返回给客户端一个"接收到"的确认信息。
*/
