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#include <netinet/ip.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
int main(int argc, char * argv[])
{
if (argc < 2) {
printf("Usage:\n\t%s [server ip]\n", argv[0]);
return -1;
}
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
fprintf(stderr, "socket error: %s\n", strerror(errno));
return EXIT_FAILURE;
}
struct sockaddr_in server_address;
bzero (&server_address, sizeof(server_address));
server_address.sin_family = AF_INET;
server_address.sin_port = htons(54321);
if (!inet_pton(AF_INET, argv[1], &server_address.sin_addr)) {
printf("Inavlid ip address\n");
return -1;
}
char* message = "Hello server!";
ssize_t message_len = strlen(message);
if (sendto(sockfd, message, message_len, 0, (struct sockaddr*) &server_address, sizeof(server_address)) != message_len) {
fprintf(stderr, "sendto error: %s\n", strerror(errno));
return EXIT_FAILURE;
}
close (sockfd);
return EXIT_SUCCESS;
}
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