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