341 lines
9.3 KiB
C
341 lines
9.3 KiB
C
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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: v1.05 12/28/2000 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
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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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The single required parameter is the Ethernet MAC (station) address
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of the machine to wake. This is typically retrieved with the 'arp'
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program while the target machine is awake.
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Options:
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-b Send wake-up packet to the broadcast address.
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-D Increase the debug level.
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-i ifname Use interface IFNAME instead of the default 'eth0'.
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-p <pw> Append the four or six byte password PW to the packet.
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A password is only required for a few adapter types.
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The password may be specified in ethernet hex format
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or dotted decimal (Internet address)
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-p 00:22:44:66:88:aa
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-p 192.168.1.1
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";
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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 is part of the network tricks package.
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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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410 Severn Ave., Suite 210
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Annapolis MD 21403
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The single required parameter is the Ethernet MAC (station) address
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of the machine to wake. This is typically retrieved with the 'arp'
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program while the target machine is awake.
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Options:
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-b Send wake-up packet to the broadcast address.
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-D Increase the debug level.
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-i ifname Use interface IFNAME instead of the default "eth0".
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-p <pw> Append the four or six byte password PW to the packet.
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A password is only required for a few adapter types.
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The password may be specified in ethernet hex format
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or dotted decimal (Internet address)
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-p 00:22:44:66:88:aa
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-p 192.168.1.1
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Note: 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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*/
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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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#ifdef UIO_MAXIOV
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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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#ifdef USE_SENDMSG
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#include <iovec.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_fill(unsigned char *pkt, char *arg);
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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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struct sockaddr whereto; /* who to wake up */
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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 i, c, pktsize;
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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 ((s = socket(AF_INET, SOCK_PACKET, SOCK_PACKET)) < 0) {
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if (errno == EPERM)
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fprintf(stderr, "ether-wake must run as root\n");
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else
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perror("ether-wake: socket");
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if (! debug)
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return 2;
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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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pktsize = get_fill(outpack, argv[optind]);
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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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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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whereto.sa_family = 0;
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strcpy(whereto.sa_data, ifname);
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if ((i = sendto(s, outpack, pktsize, 0, &whereto, 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, &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;
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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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static int get_fill(unsigned char *pkt, char *arg)
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{
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int sa[6];
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unsigned char station_addr[6];
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int byte_cnt;
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int offset, i;
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char *cp;
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for (cp = arg; *cp; cp++)
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if (*cp != ':' && !isxdigit(*cp)) {
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(void)fprintf(stderr,
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"ping: patterns must be specified as hex digits.\n");
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exit(2);
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}
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byte_cnt = sscanf(arg, "%2x:%2x:%2x:%2x:%2x:%2x",
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&sa[0], &sa[1], &sa[2], &sa[3], &sa[4], &sa[5]);
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for (i = 0; i < 6; i++)
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station_addr[i] = sa[i];
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if (debug)
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fprintf(stderr, "Command line stations address is "
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"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n",
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sa[0], sa[1], sa[2], sa[3], sa[4], sa[5]);
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if (byte_cnt != 6) {
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(void)fprintf(stderr,
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"ping: The Magic Packet address must be specified as "
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"00:11:22:33:44:55.\n");
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exit(2);
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}
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if (opt_broadcast)
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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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memset(pkt+offset, 0xff, 6);
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offset += 6;
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for (i = 0; i < 16; i++) {
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memcpy(pkt+offset, station_addr, 6);
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offset += 6;
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}
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if (debug) {
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fprintf(stderr, "Packet is ");
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for (i = 0; i < offset; i++)
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fprintf(stderr, " %2.2x", pkt[i]);
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fprintf(stderr, ".\n");
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}
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return offset;
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}
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static int get_wol_pw(const char *optarg)
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{
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int passwd[6];
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int byte_cnt;
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int i;
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byte_cnt = sscanf(optarg, "%2x:%2x:%2x:%2x:%2x:%2x",
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&passwd[0], &passwd[1], &passwd[2],
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&passwd[3], &passwd[4], &passwd[5]);
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if (byte_cnt < 4)
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byte_cnt = sscanf(optarg, "%d.%d.%d.%d",
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&passwd[0], &passwd[1], &passwd[2], &passwd[3]);
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if (byte_cnt < 4) {
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fprintf(stderr, "Unable to read the Wake-On-LAN password.\n");
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return 0;
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}
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printf(" The Magic packet password is %2.2x %2.2x %2.2x %2.2x (%d).\n",
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passwd[0], passwd[1], passwd[2], passwd[3], byte_cnt);
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for (i = 0; i < byte_cnt; i++)
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wol_passwd[i] = passwd[i];
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return wol_passwd_sz = byte_cnt;
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}
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#if 0
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{
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to = (struct sockaddr_in *)&whereto;
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to->sin_family = AF_INET;
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if (inet_aton(target, &to->sin_addr)) {
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hostname = target;
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}
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memset (&sa, 0, sizeof sa);
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sa.sa_family = AF_INET;
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strncpy (sa.sa_data, interface, sizeof sa.sa_data);
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sendto (sock, buf, bufix + len, 0, &sa, sizeof sa);
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strncpy (sa.sa_data, interface, sizeof sa.sa_data);
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#if 1
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sendto (sock, buf, bufix + len, 0, &sa, sizeof sa);
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#else
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bind (sock, &sa, sizeof sa);
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connect();
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send (sock, buf, bufix + len, 0);
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#endif
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}
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#endif
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/*
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* Local variables:
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* compile-command: "gcc -O -Wall -o ether-wake ether-wake.c"
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* c-indent-level: 4
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* c-basic-offset: 4
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* c-indent-level: 4
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* tab-width: 4
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* End:
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*/
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