62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <assert.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#define BUFLEN 512
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#define PORT 1234
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int main(void)
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{
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int ret;
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int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (sock == -1) {
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perror("socket");
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return -1;
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}
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struct sockaddr_in sockaddr = {0};
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sockaddr.sin_family = AF_INET;
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sockaddr.sin_port = htons(PORT);
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sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
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ret = bind(sock, (struct sockaddr *)&sockaddr, (sizeof (struct sockaddr_in)));
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if (ret == -1) {
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perror("bind");
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return -1;
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}
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char buf[BUFLEN];
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while (1) {
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printf("Wait for datagram\n");
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struct sockaddr_in src_addr = {0};
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socklen_t addrlen = (sizeof (struct sockaddr_in));
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ssize_t recv_len = recvfrom(sock, buf, BUFLEN, 0, (struct sockaddr *)&src_addr, &addrlen);
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if (recv_len == -1) {
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perror("recvfrom");
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return -1;
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}
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buf[recv_len] = 0;
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printf("Received packet from %s:%d\n", inet_ntoa(src_addr.sin_addr), ntohs(src_addr.sin_port));
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printf("Data: %s\n", buf);
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/*
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//now reply the client with the same data
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if (sendto(s, buf, recv_len, 0, (struct sockaddr*) &si_other, slen) == -1) {
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die("sendto()");
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}
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*/
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}
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close(sock);
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return 0;
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}
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