2021-02-08 16:16:19 +01:00

32 lines
789 B
C

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
int main() {
int sockfd;
struct sockaddr_in servaddr, cliaddr;
socklen_t cliaddrlen = sizeof(cliaddr);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(20169);
bind(sockfd, (const struct sockaddr *) &servaddr, sizeof(servaddr));
uint8_t buf[800];
while (1) {
int n = recvfrom(sockfd, buf, sizeof(buf), MSG_TRUNC,
(struct sockaddr *) &cliaddr, &cliaddrlen);
printf("received %d octets from %04x\n",
n, cliaddr.sin_addr.s_addr);
}
}