linux c soceket通信如何获得client端的ip地址呢.我想在server端做ip过滤
linux c soceket通信如何获得client端的ip地址呢.我想在server端做ip过滤.请指教.多谢~~
[解决办法]
转贴：
File: prg4_1.c
#include <stdio.h> /* These are the usual header files */
#include <strings.h> /* for bzero() */
#include <unistd.h> /* for close() */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT 1234 /* Port that will be opened */
#define BACKLOG 1 /* Number of allowed connections */
main()
{
int listenfd, connectfd; /* socket descriptors */
struct sockaddr_in server; /* server 's address information */
struct sockaddr_in client; /* client 's address information */
int sin_size;
/* Create TCP socket */
if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
/* handle exception */
perror( "Creating socket failed. ");
exit(1);
}
/* set socket can be reused */
int opt = SO_REUSEADDR;
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
bzero(&server,sizeof(server)); /* fill server with 0s */
server.sin_family=AF_INET;
server.sin_port=htons(PORT);
server.sin_addr.s_addr = htonl (INADDR_ANY);
if (bind(listenfd, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1) {
/* handle exception */
perror( "Bind error. ");
exit(1);
}
if(listen(listenfd,BACKLOG) == -1){ /* calls listen() */
perror( "listen() error\n ");
exit(1);
}
sin_size=sizeof(struct sockaddr_in);
if ((connectfd = accept(listenfd,(struct sockaddr *)&client,&sin_size))==-1) {
/* calls accept() */
perror( "accept() error\n ");
exit(1);
}
printf( "You got a connection from %s\n ",inet_ntoa(client.sin_addr) ); /* prints client 's IP */
send(connectfd, "Welcome to my server.\n ",22,0); /* send to the client welcome message */
close(connectfd); /* close connectfd */
close(listenfd); /* close listenfd */
}
这是一段printf( "You got a connection from %s\n ",inet_ntoa(client.sin_addr) ); /* prints client 's IP */可以实现!
