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/* send wake-on-lan magic ethernet packet */
#include <u.h>
#include <libc.h>
#include <ip.h>
enum {
Eaddrlen = 6, /* 48 bits */
};
typedef struct Wolpack Wolpack;
struct Wolpack{
uchar magic[6];
uchar macs[16][Eaddrlen];
char pass[6+1];
};
int verbose;
void
usage(void)
{
fprint(2, "usage: wol [-v] [-a dialstr] [-c password] macaddr\n");
exits("usage");
}
void
fillmac(Wolpack *w, uchar *mac)
{
int i;
for(i = 0; i < nelem(w->macs); i++)
memmove(w->macs[i], mac, Eaddrlen);
}
void
dumppack(Wolpack *w)
{
int i;
print("packet: [\n");
print("\t%E\n", w->magic);
for(i = 0; i < nelem(w->macs); i++)
print("\t%E\n", w->macs[i]);
print("\t%6s\n", w->pass);
print("]\n");
}
void
main(int argc, char* argv[])
{
int fd, nw;
char *argmac, *pass, *address;
uchar mac[Eaddrlen];
static Wolpack w = {
.magic { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }
};
address = pass = nil;
fmtinstall('E', eipfmt);
ARGBEGIN{
case 'a':
address = EARGF(usage());
break;
case 'c':
pass = EARGF(usage());
break;
case 'v':
verbose++;
break;
default:
usage();
}ARGEND
if(argc != 1)
usage();
argmac = argv[0];
if(verbose)
print("mac is %s, pass is %s\n", argmac, pass);
parseether(mac, argmac);
fillmac(&w, mac);
if(pass){
if(strlen(pass) > 6)
sysfatal("password greater than 6 bytes");
strcpy(w.pass, pass);
}
if(verbose)
dumppack(&w);
if(!address)
address = "udp!255.255.255.255!0";
fd = dial(address, nil, nil, nil);
if(fd < 0)
sysfatal("%s: %r", address);
nw = write(fd, &w, sizeof w);
if(nw != sizeof w)
sysfatal("error sending: %r");
exits(0);
}
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