UNIX环境高级编程——TCP/IP网络编程

//receiver.c

#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <errno.h>  
#include <strings.h>  
#include <string.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
      
typedef struct sockaddr SA;  
#define N 64  
      
int main(int argc, char *argv[])  
{  
    int sockfd;  
    struct sockaddr_in myaddr, peeraddr;  
    socklen_t len;  
    char buf[N] = {0};  
      
    if (argc < 3)  
    {  
        fprintf(stdout, "usage:%s ip portn", argv[0]);  
        exit(0);  
    }  
      
    if ((sockfd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)  
    {  
        perror("socket");  
        exit(-1);  
    }  
          
    bzero(&myaddr, sizeof(myaddr));  
    myaddr.sin_family = PF_INET;  
    myaddr.sin_port = htons(atoi(argv[2]));//6000  
    myaddr.sin_addr.s_addr = inet_addr(argv[1]);//0.0.0.0 192.168.1.255  
      
    if (bind (sockfd, (SA *)&myaddr, sizeof(myaddr)) == -1)  
    {  
        perror("bind");  
        exit(-1);  
    }  
      
    len = sizeof(peeraddr);  
    bzero(&peeraddr, sizeof(peeraddr));  
      
    while (1)  
    {  
        bzero(buf, sizeof(buf));  
        if (-1 == recvfrom(sockfd, buf, N, 0, (SA *)&peeraddr, &len))  
        {  
            printf("errno=%d %sn", errno, strerror(errno));  
            exit(-1);  
        }  
      
        printf("from %s:%d %sn", inet_ntoa(peeraddr.sin_addr),  
                ntohs(peeraddr.sin_port), buf);  
    }  
      
    exit(0);  
}

//sender.c

#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <errno.h>  
#include <strings.h>  
#include <string.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
      
typedef struct sockaddr SA;  
#define N 64  
      
int main(int argc, char *argv[])  
{  
    int sockfd;  
    struct sockaddr_in servaddr;  
    char buf[N] = {0};  
      
    if (argc < 3)  
    {  
        fprintf(stdout, "usage:%s ip portn", argv[0]);  
        exit(0);  
    }  
      
    if ((sockfd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)  
    {  
        perror("socket");  
        exit(-1);  
    }  
      
    int on = 1;  
    if (setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) == -1)  
    {  
        perror("setsockopt");  
        exit(-1);  
    }  
          
    bzero(&servaddr, sizeof(servaddr));  
    servaddr.sin_family = PF_INET;  
    servaddr.sin_port = htons(atoi(argv[2]));// 6000  
    servaddr.sin_addr.s_addr = inet_addr(argv[1]);//192.168.1.255  
      
    strcpy(buf, "this is a broadcast package");  
    while (1)  
    {  
        sendto(sockfd, buf, N, 0, (SA *)&servaddr, sizeof(servaddr));  
        sleep(1);  
    }  
      
    close(sockfd);  
      
    exit(0);  
}

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