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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
int main(int argc, char *argv[]) {
int sockfd;
struct sockaddr_in servaddr, cli;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
int port = atoi(argv[1]);
servaddr.sin_port = htons(port);
bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
socklen_t len = sizeof(cli);
while(1) {
int n;
char *buf = malloc(100);
while(
(n = recvfrom(sockfd, (char *)buf, 100, MSG_WAITALL, (struct sockaddr*) &cli, &len))
> 0
) {
printf("Client message: %s\n", buf);
fflush(stdout);
sendto(sockfd, buf, n, MSG_CONFIRM, (const struct sockaddr *) &cli, len);
}
}
close(sockfd);
return 0;
}
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