/* Wake-on-LAN.
 *
 * Copyright (c) 2017, Curtis McEnroe <programble@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <err.h>
#include <netinet/in.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sysexits.h>

#define MAC 0x04, 0x7D, 0x7B, 0xD5, 0x6A, 0x53

const uint8_t payload[] = {
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    MAC, MAC, MAC, MAC, MAC, MAC, MAC, MAC,
    MAC, MAC, MAC, MAC, MAC, MAC, MAC, MAC,
};

int main() {
    int sock = socket(PF_INET, SOCK_DGRAM, 0);
    if (sock < 0) err(EX_OSERR, "socket");

    int on = 1;
    int error = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
    if (error) err(EX_OSERR, "setsockopt");

    struct sockaddr_in addr = {
        .sin_family = AF_INET,
        .sin_port = 9,
        .sin_addr.s_addr = INADDR_BROADCAST,
    };

    ssize_t len = sendto(
        sock, payload, sizeof(payload), 0,
        (struct sockaddr *)&addr, sizeof(addr)
    );
    if (len < 0) err(EX_IOERR, "sendto");

    return EX_OK;
}