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udp_server_broadcast.c
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udp_server_broadcast.c
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#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <stdlib.h>
#include <signal.h>
#include "wrap.h"
#define MAXLINE 80
int sock_fd;
void sig_handler(int signo)
{
if (signo == SIGINT)
{
printf("Got signo %d\n", signo);
Close(sock_fd);
exit(1);
}
}
/*
* Usage :
* ./udp_server_broadcast <port>
*/
int main(int argc, char *argv[])
{
struct sockaddr_in server_addr, client_addr;
socklen_t client_addr_len;
char buf[MAXLINE];
char str[INET_ADDRSTRLEN];
int bytes;
if (argc != 2)
{
fprintf(stderr, "%s <port>\n", argv[0]);
exit(1);
}
/* register sigint handler */
if (signal(SIGINT, sig_handler) == SIG_ERR)
{
perror("signal register error");
exit(1);
}
/*
* AF_INET for IPv4
* SOCK_DGRAM for UDP
* protocol : 0
*/
sock_fd = Socket(AF_INET, SOCK_DGRAM, 0);
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(atoi(argv[1]));
/* bind fd and address (fixed address) */
Bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
printf("Accepting connecting...\n");
while (1)
{
/* recv client requst */
client_addr_len = sizeof(client_addr);
bytes = recvfrom(sock_fd, buf, MAXLINE, 0, (struct sockaddr*)&client_addr, &client_addr_len);
if (bytes == -1)
perror("recvform error");
/* print out some info of sender */
buf[bytes-1] = '\0';
printf("recv %s(%d) bytes from %s at port %d\n", buf, bytes-1, inet_ntop(AF_INET, &client_addr.sin_addr, str, sizeof(str)), ntohs(client_addr.sin_port));
}
return 0;
}