+/* ether-wake.c: Send a magic packet to wake up sleeping machines. */
+
+static char version_msg[] =
+"ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/";
+static char brief_usage_msg[] =
+"usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n"
+" Use '-u' to see the complete set of options.\n";
+static char usage_msg[] =
+"usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n"
+"\n"
+" This program generates and transmits a Wake-On-LAN (WOL)\n"
+" \"Magic Packet\", used for restarting machines that have been\n"
+" soft-powered-down (ACPI D3-warm state).\n"
+" It currently generates the standard AMD Magic Packet format, with\n"
+" an optional password appended.\n"
+"\n"
+" The single required parameter is the Ethernet MAC (station) address\n"
+" of the machine to wake or a host ID with known NSS 'ethers' entry.\n"
+" The MAC address may be found with the 'arp' program while the target\n"
+" machine is awake.\n"
+"\n"
+" Options:\n"
+" -b Send wake-up packet to the broadcast address.\n"
+" -D Increase the debug level.\n"
+" -i ifname Use interface IFNAME instead of the default 'eth0'.\n"
+" -p <pw> Append the four or six byte password PW to the packet.\n"
+" A password is only required for a few adapter types.\n"
+" The password may be specified in ethernet hex format\n"
+" or dotted decimal (Internet address)\n"
+" -p 00:22:44:66:88:aa\n"
+" -p 192.168.1.1\n";
+
+/*
+ This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet",
+ used for restarting machines that have been soft-powered-down
+ (ACPI D3-warm state). It currently generates the standard AMD Magic Packet
+ format, with an optional password appended.
+
+ This software may be used and distributed according to the terms
+ of the GNU Public License, incorporated herein by reference.
+ Contact the author for use under other terms.
+
+ This source file was originally part of the network tricks package, and
+ is now distributed to support the Scyld Beowulf system.
+ Copyright 1999-2003 Donald Becker and Scyld Computing Corporation.
+
+ The author may be reached as becker@scyld, or C/O
+ Scyld Computing Corporation
+ 914 Bay Ridge Road, Suite 220
+ Annapolis MD 21403
+
+ Notes:
+ On some systems dropping root capability allows the process to be
+ dumped, traced or debugged.
+ If someone traces this program, they get control of a raw socket.
+ Linux handles this safely, but beware when porting this program.
+
+ An alternative to needing 'root' is using a UDP broadcast socket, however
+ doing so only works with adapters configured for unicast+broadcast Rx
+ filter. That configuration consumes more power.
+*/
+\f
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <string.h>
+
+#if 0 /* Only exists on some versions. */
+#include <ioctls.h>
+#endif
+
+#include <sys/socket.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <linux/if.h>
+
+#include <features.h>
+#if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#else
+#include <asm/types.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#endif
+#include <netdb.h>
+#include <netinet/ether.h>
+
+/* Grrr, no consistency between include versions.
+ Enable this if setsockopt() isn't declared with your library. */
+#if 0
+extern int setsockopt __P ((int __fd, int __level, int __optname,
+ __ptr_t __optval, int __optlen));
+#else /* New, correct head files. */
+#include <sys/socket.h>
+#endif
+
+u_char outpack[1000];
+int outpack_sz = 0;
+int debug = 0;
+u_char wol_passwd[6];
+int wol_passwd_sz = 0;
+
+static int opt_no_src_addr = 0, opt_broadcast = 0;
+
+static int get_dest_addr(const char *arg, struct ether_addr *eaddr);
+static int get_fill(unsigned char *pkt, struct ether_addr *eaddr);
+static int get_wol_pw(const char *optarg);
+
+int main(int argc, char *argv[])
+{
+ char *ifname = "eth0";
+ int one = 1; /* True, for socket options. */
+ int s; /* Raw socket */
+ int errflag = 0, verbose = 0, do_version = 0;
+ int perm_failure = 0;
+ int i, c, pktsize;
+#if defined(PF_PACKET)
+ struct sockaddr_ll whereto;
+#else
+ struct sockaddr whereto; /* who to wake up */
+#endif
+ struct ether_addr eaddr;
+
+ while ((c = getopt(argc, argv, "bDi:p:uvV")) != -1)
+ switch (c) {
+ case 'b': opt_broadcast++; break;
+ case 'D': debug++; break;
+ case 'i': ifname = optarg; break;
+ case 'p': get_wol_pw(optarg); break;
+ case 'u': printf(usage_msg); return 0;
+ case 'v': verbose++; break;
+ case 'V': do_version++; break;
+ case '?':
+ errflag++;
+ }
+ if (verbose || do_version)
+ printf("%s\n", version_msg);
+ if (errflag) {
+ fprintf(stderr, brief_usage_msg);
+ return 3;
+ }
+
+ if (optind == argc) {
+ fprintf(stderr, "Specify the Ethernet address as 00:11:22:33:44:55.\n");
+ return 3;
+ }
+
+ /* Note: PF_INET, SOCK_DGRAM, IPPROTO_UDP would allow SIOCGIFHWADDR to
+ work as non-root, but we need SOCK_PACKET to specify the Ethernet
+ destination address. */
+#if defined(PF_PACKET)
+ s = socket(PF_PACKET, SOCK_RAW, 0);
+#else
+ s = socket(AF_INET, SOCK_PACKET, SOCK_PACKET);
+#endif
+ if (s < 0) {
+ if (errno == EPERM)
+ fprintf(stderr, "ether-wake: This program must be run as root.\n");
+ else
+ perror("ether-wake: socket");
+ perm_failure++;
+ }
+ /* Don't revert if debugging allows a normal user to get the raw socket. */
+ setuid(getuid());
+
+ /* We look up the station address before reporting failure so that
+ errors may be reported even when run as a normal user.
+ */
+ if (get_dest_addr(argv[optind], &eaddr) != 0)
+ return 3;
+ if (perm_failure && ! debug)
+ return 2;
+
+ pktsize = get_fill(outpack, &eaddr);
+
+ /* Fill in the source address, if possible.
+ The code to retrieve the local station address is Linux specific. */
+ if (! opt_no_src_addr) {
+ struct ifreq if_hwaddr;
+ unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
+
+ strcpy(if_hwaddr.ifr_name, ifname);
+ if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0) {
+ fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n", ifname,
+ strerror(errno));
+ /* Magic packets still work if our source address is bogus, but
+ we fail just to be anal. */
+ return 1;
+ }
+ memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6);
+
+ if (verbose) {
+ printf("The hardware address (SIOCGIFHWADDR) of %s is type %d "
+ "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", ifname,
+ if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
+ hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
+ }
+ }
+
+ if (wol_passwd_sz > 0) {
+ memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz);
+ pktsize += wol_passwd_sz;
+ }
+
+ if (verbose > 1) {
+ printf("The final packet is: ");
+ for (i = 0; i < pktsize; i++)
+ printf(" %2.2x", outpack[i]);
+ printf(".\n");
+ }
+
+ /* This is necessary for broadcasts to work */
+ if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&one, sizeof(one)) < 0)
+ perror("setsockopt: SO_BROADCAST");
+
+#if defined(PF_PACKET)
+ {
+ struct ifreq ifr;
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {
+ fprintf(stderr, "SIOCGIFINDEX on %s failed: %s\n", ifname,
+ strerror(errno));
+ return 1;
+ }
+ memset(&whereto, 0, sizeof(whereto));
+ whereto.sll_family = AF_PACKET;
+ whereto.sll_ifindex = ifr.ifr_ifindex;
+ /* The manual page incorrectly claims the address must be filled.
+ We do so because the code may change to match the docs. */
+ whereto.sll_halen = ETH_ALEN;
+ memcpy(whereto.sll_addr, outpack, ETH_ALEN);
+
+ }
+#else
+ whereto.sa_family = 0;
+ strcpy(whereto.sa_data, ifname);
+#endif
+
+ if ((i = sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto,
+ sizeof(whereto))) < 0)
+ perror("sendto");
+ else if (debug)
+ printf("Sendto worked ! %d.\n", i);
+
+#ifdef USE_SEND
+ if (bind(s, (struct sockaddr *)&whereto, sizeof(whereto)) < 0)
+ perror("bind");
+ else if (send(s, outpack, 100, 0) < 0)
+ perror("send");
+#endif
+#ifdef USE_SENDMSG
+ {
+ struct msghdr msghdr = { 0,};
+ struct iovec iovector[1];
+ msghdr.msg_name = &whereto;
+ msghdr.msg_namelen = sizeof(whereto);
+ msghdr.msg_iov = iovector;
+ msghdr.msg_iovlen = 1;
+ iovector[0].iov_base = outpack;
+ iovector[0].iov_len = pktsize;
+ if ((i = sendmsg(s, &msghdr, 0)) < 0)
+ perror("sendmsg");
+ else if (debug)
+ printf("sendmsg worked, %d (%d).\n", i, errno);
+ }
+#endif
+
+ return 0;
+}
+
+/* Convert the host ID string to a MAC address.
+ The string may be a
+ Host name
+ IP address string
+ MAC address string
+*/
+
+static int get_dest_addr(const char *hostid, struct ether_addr *eaddr)
+{
+ struct ether_addr *eap;
+
+ eap = ether_aton(hostid);
+ if (eap) {
+ *eaddr = *eap;
+ if (debug)
+ fprintf(stderr, "The target station address is %s.\n",
+ ether_ntoa(eaddr));
+ } else if (ether_hostton(hostid, eaddr) == 0) {
+ if (debug)
+ fprintf(stderr, "Station address for hostname %s is %s.\n",
+ hostid, ether_ntoa(eaddr));
+ } else {
+ (void)fprintf(stderr,
+ "ether-wake: The Magic Packet host address must be "
+ "specified as\n"
+ " - a station address, 00:11:22:33:44:55, or\n"
+ " - a hostname with a known 'ethers' entry.\n");
+ return -1;
+ }
+ return 0;
+}
+
+
+static int get_fill(unsigned char *pkt, struct ether_addr *eaddr)
+{
+ int offset, i;
+ unsigned char *station_addr = eaddr->ether_addr_octet;
+
+ if (opt_broadcast)
+ memset(pkt+0, 0xff, 6);
+ else
+ memcpy(pkt, station_addr, 6);
+ memcpy(pkt+6, station_addr, 6);
+ pkt[12] = 0x08; /* Or 0x0806 for ARP, 0x8035 for RARP */
+ pkt[13] = 0x42;
+ offset = 14;
+
+ memset(pkt+offset, 0xff, 6);
+ offset += 6;
+
+ for (i = 0; i < 16; i++) {
+ memcpy(pkt+offset, station_addr, 6);
+ offset += 6;
+ }
+ if (debug) {
+ fprintf(stderr, "Packet is ");
+ for (i = 0; i < offset; i++)
+ fprintf(stderr, " %2.2x", pkt[i]);
+ fprintf(stderr, ".\n");
+ }
+ return offset;
+}
+
+static int get_wol_pw(const char *optarg)
+{
+ int passwd[6];
+ int byte_cnt;
+ int i;
+
+ byte_cnt = sscanf(optarg, "%2x:%2x:%2x:%2x:%2x:%2x",
+ &passwd[0], &passwd[1], &passwd[2],
+ &passwd[3], &passwd[4], &passwd[5]);
+ if (byte_cnt < 4)
+ byte_cnt = sscanf(optarg, "%d.%d.%d.%d",
+ &passwd[0], &passwd[1], &passwd[2], &passwd[3]);
+ if (byte_cnt < 4) {
+ fprintf(stderr, "Unable to read the Wake-On-LAN password.\n");
+ return 0;
+ }
+ printf(" The Magic packet password is %2.2x %2.2x %2.2x %2.2x (%d).\n",
+ passwd[0], passwd[1], passwd[2], passwd[3], byte_cnt);
+ for (i = 0; i < byte_cnt; i++)
+ wol_passwd[i] = passwd[i];
+ return wol_passwd_sz = byte_cnt;
+}
+
+#if 0
+{
+ to = (struct sockaddr_in *)&whereto;
+ to->sin_family = AF_INET;
+ if (inet_aton(target, &to->sin_addr)) {
+ hostname = target;
+ }
+ memset (&sa, 0, sizeof sa);
+ sa.sa_family = AF_INET;
+ strncpy (sa.sa_data, interface, sizeof sa.sa_data);
+ sendto (sock, buf, bufix + len, 0, &sa, sizeof sa);
+ strncpy (sa.sa_data, interface, sizeof sa.sa_data);
+#if 1
+ sendto (sock, buf, bufix + len, 0, &sa, sizeof sa);
+#else
+ bind (sock, &sa, sizeof sa);
+ connect();
+ send (sock, buf, bufix + len, 0);
+#endif
+}
+#endif
+
+\f
+/*
+ * Local variables:
+ * compile-command: "gcc -O -Wall -o ether-wake ether-wake.c"
+ * c-indent-level: 4
+ * c-basic-offset: 4
+ * c-indent-level: 4
+ * tab-width: 4
+ * End:
+ */
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