UNIX网络编程：getsockname和getpeername函数

服务器的代码：

#include    "unp.h"  
      
int
main(int argc, char ** argv)  
{  
    int         listenfd,connfd;  
    struct      sockaddr_in servaddr;  
    pid_t       pid;  
    char        temp[20];  
      
    listenfd = Socket(AF_INET, SOCK_STREAM, 0);  
    bzero(&servaddr, sizeof(servaddr));  
    servaddr.sin_family = AF_INET;  
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);  
    servaddr.sin_port = htons(10010);  
    Bind(listenfd, (SA *)&servaddr, sizeof(servaddr));  
    Listen(listenfd, LISTENQ);  
    for( ; ; )  
    {  
        struct sockaddr_in local;  
        connfd = Accept(listenfd, (SA *)NULL, NULL);  
        if((pid = fork()) == 0)  
        {  
            Close(listenfd);struct sockaddr_in serv, guest;  
            char serv_ip[20];  
            char guest_ip[20];  
            socklen_t serv_len = sizeof(serv);  
            socklen_t guest_len = sizeof(guest);  
            getsockname(connfd, (struct sockaddr *)&serv, &serv_len);  
            getpeername(connfd, (struct sockaddr *)&guest, &guest_len);  
            Inet_ntop(AF_INET, &serv.sin_addr, serv_ip, sizeof(serv_ip));  
            Inet_ntop(AF_INET, &guest.sin_addr, guest_ip, sizeof(guest_ip));  
            printf("host %s:%d guest %s:%dn", serv_ip, ntohs(serv.sin_port), guest_ip, ntohs(guest.sin_port));  
            char buf[] = "hello world";  
            Write(connfd, buf, strlen(buf));  
            Close(connfd);  
            exit(0);  
        }  
        Close(connfd);  
    }  
}

客户端的代码：

#include "unp.h"  
#define DEST_IP "127.0.0.1"  
      
int
main(int argc, char ** argv)  
{  
    int         sockfd, n;  
    char        buf[100];  
    char        serv_ip[20], guest_ip[20];  
    struct      sockaddr_in servaddr;  
      
    sockfd = Socket(AF_INET, SOCK_STREAM, 0);  
    bzero(&servaddr, sizeof(struct sockaddr_in));  
    servaddr.sin_family = AF_INET;  
    servaddr.sin_port = htons(10010);  
      
    Inet_pton(AF_INET, DEST_IP, &servaddr.sin_addr);  
    Connect(sockfd, (SA *)&servaddr, sizeof(servaddr));  
      
    struct sockaddr_in serv, guest;  
    socklen_t serv_len = sizeof(serv);  
    socklen_t guest_len = sizeof(guest);  
      

    getsockname(sockfd, (SA *)&guest, &guest_len);  
    getpeername(sockfd, (SA *)&serv, &serv_len);  
      
    Inet_ntop(AF_INET, &guest.sin_addr, guest_ip, sizeof(guest_ip));  
    Inet_ntop(AF_INET, &serv.sin_addr, serv_ip, sizeof(serv_ip));  
      
    printf("host  %s:%d, guest  %s:%dn", serv_ip, ntohs(serv.sin_port), guest_ip, ntohs(guest.sin_port));  
      
    n = Read(sockfd, buf, 100);  
    buf[n] = '';  
    printf("%sn", buf);  
    Close(sockfd);  
    exit(0);  
}

TCP

（编辑：云计算网_泰州站长网）

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