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#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
int main(int argc, char** argv)
{
const char* addr_str = "127.0.0.1";
if (argc > 1)
addr_str = argv[1];
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
perror("socket");
return 1;
}
struct timeval timeout {
5, 0
};
int rc = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
if (rc < 0) {
perror("setsockopt");
return 1;
}
struct sockaddr_in dst_addr;
memset(&dst_addr, 0, sizeof(dst_addr));
dst_addr.sin_family = AF_INET;
dst_addr.sin_port = htons(8080);
rc = inet_pton(AF_INET, addr_str, &dst_addr.sin_addr);
if (rc <= 0) {
perror("inet_pton");
return 1;
}
char buffer[BUFSIZ];
const char* msg = "Test message";
sendto(fd, (const char*)msg, strlen(msg), 0, (const struct sockaddr*)&dst_addr, sizeof(dst_addr));
printf("Message sent.\n");
struct sockaddr_in src_addr;
socklen_t src_addr_len = sizeof(src_addr);
ssize_t nrecv = recvfrom(fd, (char*)buffer, sizeof(buffer), 0, (struct sockaddr*)&src_addr, &src_addr_len);
if (nrecv < 0) {
perror("recvfrom");
return 1;
}
buffer[nrecv] = '\0';
printf("Server: %s\n", buffer);
close(fd);
return 0;
}
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