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