WOL: Wake On Lan (within custom subnet mask)

Ooooh, my sweet Wake On Lan message!
So take action and wake up all your machines using this Objective-C method!


/** Sends a Wake On Lan (WOL) messagge to the specified target.

 MAC address must be in the 12:34:56:78:9A:BC format.

 @param mac The MAC address to wake up.
 @param addr The subnet mask to use.
 @return Returns true on success, false otherwise.
 @see wakeOnLanByMacAddress:

 */
+ (BOOL)wakeOnLanByMacAddress:(char *)mac usingSubnet:(char *)addr {

    int BUFMAX = 1024;
    int MACLEN = 6;

    int sd;
    int optval;
    char unsigned buf[BUFMAX];
    int len;
    struct sockaddr_in sin;
    unsigned char macAddr[MACLEN];
    unsigned char *p;
    int i, j;

    bzero((char *)&sin,sizeof(sin)); // Clear sin struct.
    sin.sin_family = AF_INET;
    host2addr(addr,&sin.sin_addr,(short*)&sin.sin_family);    // Host.
    sin.sin_port = htons(9);                                // Port.
    if ((sd=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) < 0) {
        LogError(@"Can't get socket");
        return NO;
    }
    optval = 1;
    if (setsockopt(sd,SOL_SOCKET,SO_BROADCAST,&optval,sizeof(optval)) < 0) {
        LogError(@"Can't set sockopt (%d)", errno);
        return NO;
    }
    p = (unsigned char*)mac;
    j = hex2((char*)p);
    if (j < 0) {
    MACerror:
        LogError(@"Illegal MAC address: %s",mac);
        return NO;
    }
    macAddr[0] = j;
    p += 2;
    for (i=1; i < MACLEN; i++) {
        if (*p++ != ':') goto MACerror;
        j = hex2((char*)p);
        if (j < 0) goto MACerror;
        macAddr[i] = j;
        p += 2;
    }
    p = buf;
    for (i=0; i < 6; i++) {    // 6 bytes of FFhex.
        *p++ = 0xFF;
    }
    for (i=0; i < 16; i++) { // MAC addresses repeated 16 times.
        for (j=0; j < MACLEN; j++) {
            *p++ = macAddr[j];
        }
    }
    len = p - buf;

    if (sendto(sd,buf,len,0,(struct sockaddr*)&sin,sizeof(sin)) != len) {
        LogError(@"Sendto failed (%d)", errno);
        return NO;
    }


    return YES;
}



Download the ready-for-use source file (.m) of WOL: Wake On Lan (within custom subnet mask)