* Copyright 2008-2010, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Yin Qiu
*/
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#define MAX_LENGTH 4096
extern const char* __progname;
int
main(int argc, char** argv)
{
if (argc < 2) {
fprintf(stderr, "Usage: %s <host> [<port>]\n"
"Sends a UDP datagram to the specified target.\n"
"<port> defaults to 9999.\n", __progname);
return 1;
}
struct hostent* host = gethostbyname(argv[1]);
if (host == NULL) {
perror("gethostbyname");
return 1;
}
uint16_t port = 9999;
if (argc > 2)
port = atol(argv[2]);
struct sockaddr_in serverAddr;
memset(&serverAddr, 0, sizeof(struct sockaddr_in));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(port);
serverAddr.sin_addr = *((struct in_addr*)host->h_addr);
int sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (connect(sockfd, (struct sockaddr*)&serverAddr,
sizeof(struct sockaddr_in)) < 0) {
fprintf(stderr, "Calling connect() on UDP socket failed: %s\n",
strerror(errno));
return 1;
}
const char* string = "Hello";
ssize_t bytes = write(sockfd, string, strlen(string));
if (bytes < 0) {
fprintf(stderr, "UDP send failed: %s\n", strerror(errno));
return 1;
}
printf("%zd bytes sent to remote server.\n", bytes);
char buffer[MAX_LENGTH];
bytes = read(sockfd, buffer, MAX_LENGTH);
if (bytes > 0) {
printf("Received %zd bytes from remote host\n", bytes);
printf("%s\n", buffer);
} else {
printf("Error: %s\n", strerror(errno));
}
close(sockfd);
printf("Socket closed.\n");
return 0;
}
