| 1 | /* ether-wake.c: Send a magic packet to wake up sleeping machines. */
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| 2 |
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| 3 | static char version_msg[] =
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| 4 | "ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/";
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| 5 | static char brief_usage_msg[] =
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| 6 | "usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n"
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| 7 | " Use '-u' to see the complete set of options.\n";
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| 8 | static char usage_msg[] =
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| 9 | "usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n"
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| 10 | "\n"
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| 11 | " This program generates and transmits a Wake-On-LAN (WOL)\n"
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| 12 | " \"Magic Packet\", used for restarting machines that have been\n"
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| 13 | " soft-powered-down (ACPI D3-warm state).\n"
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| 14 | " It currently generates the standard AMD Magic Packet format, with\n"
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| 15 | " an optional password appended.\n"
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| 16 | "\n"
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| 17 | " The single required parameter is the Ethernet MAC (station) address\n"
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| 18 | " of the machine to wake or a host ID with known NSS 'ethers' entry.\n"
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| 19 | " The MAC address may be found with the 'arp' program while the target\n"
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| 20 | " machine is awake.\n"
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| 21 | "\n"
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| 22 | " Options:\n"
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| 23 | " -b Send wake-up packet to the broadcast address.\n"
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| 24 | " -D Increase the debug level.\n"
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| 25 | " -i ifname Use interface IFNAME instead of the default 'eth0'.\n"
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| 26 | " -p <pw> Append the four or six byte password PW to the packet.\n"
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| 27 | " A password is only required for a few adapter types.\n"
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| 28 | " The password may be specified in ethernet hex format\n"
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| 29 | " or dotted decimal (Internet address)\n"
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| 30 | " -p 00:22:44:66:88:aa\n"
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| 31 | " -p 192.168.1.1\n";
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| 32 |
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| 33 | /*
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| 34 | This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet",
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| 35 | used for restarting machines that have been soft-powered-down
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| 36 | (ACPI D3-warm state). It currently generates the standard AMD Magic Packet
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| 37 | format, with an optional password appended.
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| 38 |
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| 39 | This software may be used and distributed according to the terms
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| 40 | of the GNU Public License, incorporated herein by reference.
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| 41 | Contact the author for use under other terms.
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| 42 |
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| 43 | This source file was originally part of the network tricks package, and
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| 44 | is now distributed to support the Scyld Beowulf system.
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| 45 | Copyright 1999-2003 Donald Becker and Scyld Computing Corporation.
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| 46 |
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| 47 | The author may be reached as becker@scyld, or C/O
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| 48 | Scyld Computing Corporation
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| 49 | 914 Bay Ridge Road, Suite 220
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| 50 | Annapolis MD 21403
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| 51 |
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| 52 | Notes:
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| 53 | On some systems dropping root capability allows the process to be
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| 54 | dumped, traced or debugged.
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| 55 | If someone traces this program, they get control of a raw socket.
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| 56 | Linux handles this safely, but beware when porting this program.
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| 57 |
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| 58 | An alternative to needing 'root' is using a UDP broadcast socket, however
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| 59 | doing so only works with adapters configured for unicast+broadcast Rx
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| 60 | filter. That configuration consumes more power.
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| 61 | */
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| 62 | |
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| 63 |
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| 64 | #include <unistd.h>
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| 65 | #include <stdlib.h>
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| 66 | #include <stdio.h>
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| 67 | #include <errno.h>
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| 68 | #include <ctype.h>
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| 69 | #include <string.h>
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| 70 |
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| 71 | #if 0 /* Only exists on some versions. */
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| 72 | #include <ioctls.h>
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| 73 | #endif
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| 74 |
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| 75 | #include <sys/socket.h>
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| 76 |
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| 77 | #include <sys/types.h>
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| 78 | #include <sys/ioctl.h>
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| 79 | #include <linux/if.h>
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| 80 |
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| 81 | #include <features.h>
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| 82 | #if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1
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| 83 | #include <netpacket/packet.h>
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| 84 | #include <net/ethernet.h>
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| 85 | #else
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| 86 | #include <asm/types.h>
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| 87 | #include <linux/if_packet.h>
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| 88 | #include <linux/if_ether.h>
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| 89 | #endif
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| 90 | #include <netdb.h>
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| 91 | #include <netinet/ether.h>
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| 92 |
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| 93 | /* Grrr, no consistency between include versions.
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| 94 | Enable this if setsockopt() isn't declared with your library. */
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| 95 | #if 0
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| 96 | extern int setsockopt __P ((int __fd, int __level, int __optname,
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| 97 | __ptr_t __optval, int __optlen));
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| 98 | #else /* New, correct head files. */
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| 99 | #include <sys/socket.h>
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| 100 | #endif
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| 101 |
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| 102 | u_char outpack[1000];
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| 103 | int outpack_sz = 0;
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| 104 | int debug = 0;
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| 105 | u_char wol_passwd[6];
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| 106 | int wol_passwd_sz = 0;
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| 107 |
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| 108 | static int opt_no_src_addr = 0, opt_broadcast = 0;
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| 109 |
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| 110 | static int get_dest_addr(const char *arg, struct ether_addr *eaddr);
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| 111 | static int get_fill(unsigned char *pkt, struct ether_addr *eaddr);
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| 112 | static int get_wol_pw(const char *optarg);
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| 113 |
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| 114 | int main(int argc, char *argv[])
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| 115 | {
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| 116 | char *ifname = "eth0";
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| 117 | int one = 1; /* True, for socket options. */
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| 118 | int s; /* Raw socket */
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| 119 | int errflag = 0, verbose = 0, do_version = 0;
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| 120 | int perm_failure = 0;
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| 121 | int i, c, pktsize;
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| 122 | #if defined(PF_PACKET)
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| 123 | struct sockaddr_ll whereto;
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| 124 | #else
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| 125 | struct sockaddr whereto; /* who to wake up */
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| 126 | #endif
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| 127 | struct ether_addr eaddr;
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| 128 |
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| 129 | while ((c = getopt(argc, argv, "bDi:p:uvV")) != -1)
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| 130 | switch (c) {
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| 131 | case 'b': opt_broadcast++; break;
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| 132 | case 'D': debug++; break;
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| 133 | case 'i': ifname = optarg; break;
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| 134 | case 'p': get_wol_pw(optarg); break;
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| 135 | case 'u': printf(usage_msg); return 0;
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| 136 | case 'v': verbose++; break;
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| 137 | case 'V': do_version++; break;
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| 138 | case '?':
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| 139 | errflag++;
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| 140 | }
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| 141 | if (verbose || do_version)
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| 142 | printf("%s\n", version_msg);
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| 143 | if (errflag) {
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| 144 | fprintf(stderr, brief_usage_msg);
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| 145 | return 3;
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| 146 | }
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| 147 |
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| 148 | if (optind == argc) {
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| 149 | fprintf(stderr, "Specify the Ethernet address as 00:11:22:33:44:55.\n");
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| 150 | return 3;
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| 151 | }
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| 152 |
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| 153 | /* Note: PF_INET, SOCK_DGRAM, IPPROTO_UDP would allow SIOCGIFHWADDR to
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| 154 | work as non-root, but we need SOCK_PACKET to specify the Ethernet
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| 155 | destination address. */
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| 156 | #if defined(PF_PACKET)
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| 157 | s = socket(PF_PACKET, SOCK_RAW, 0);
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| 158 | #else
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| 159 | s = socket(AF_INET, SOCK_PACKET, SOCK_PACKET);
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| 160 | #endif
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| 161 | if (s < 0) {
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| 162 | if (errno == EPERM)
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| 163 | fprintf(stderr, "ether-wake: This program must be run as root.\n");
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| 164 | else
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| 165 | perror("ether-wake: socket");
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| 166 | perm_failure++;
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| 167 | }
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| 168 | /* Don't revert if debugging allows a normal user to get the raw socket. */
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| 169 | setuid(getuid());
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| 170 |
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| 171 | /* We look up the station address before reporting failure so that
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| 172 | errors may be reported even when run as a normal user.
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| 173 | */
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| 174 | if (get_dest_addr(argv[optind], &eaddr) != 0)
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| 175 | return 3;
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| 176 | if (perm_failure && ! debug)
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| 177 | return 2;
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| 178 |
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| 179 | pktsize = get_fill(outpack, &eaddr);
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| 180 |
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| 181 | /* Fill in the source address, if possible.
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| 182 | The code to retrieve the local station address is Linux specific. */
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| 183 | if (! opt_no_src_addr) {
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| 184 | struct ifreq if_hwaddr;
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| 185 | unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
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| 186 |
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| 187 | strcpy(if_hwaddr.ifr_name, ifname);
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| 188 | if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0) {
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| 189 | fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n", ifname,
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| 190 | strerror(errno));
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| 191 | /* Magic packets still work if our source address is bogus, but
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| 192 | we fail just to be anal. */
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| 193 | return 1;
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| 194 | }
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| 195 | memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6);
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| 196 |
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| 197 | if (verbose) {
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| 198 | printf("The hardware address (SIOCGIFHWADDR) of %s is type %d "
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| 199 | "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", ifname,
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| 200 | if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
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| 201 | hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
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| 202 | }
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| 203 | }
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| 204 |
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| 205 | if (wol_passwd_sz > 0) {
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| 206 | memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz);
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| 207 | pktsize += wol_passwd_sz;
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| 208 | }
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| 209 |
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| 210 | if (verbose > 1) {
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| 211 | printf("The final packet is: ");
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| 212 | for (i = 0; i < pktsize; i++)
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| 213 | printf(" %2.2x", outpack[i]);
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| 214 | printf(".\n");
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| 215 | }
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| 216 |
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| 217 | /* This is necessary for broadcasts to work */
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| 218 | if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&one, sizeof(one)) < 0)
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| 219 | perror("setsockopt: SO_BROADCAST");
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| 220 |
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| 221 | #if defined(PF_PACKET)
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| 222 | {
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| 223 | struct ifreq ifr;
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| 224 | strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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| 225 | if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {
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| 226 | fprintf(stderr, "SIOCGIFINDEX on %s failed: %s\n", ifname,
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| 227 | strerror(errno));
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| 228 | return 1;
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| 229 | }
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| 230 | memset(&whereto, 0, sizeof(whereto));
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| 231 | whereto.sll_family = AF_PACKET;
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| 232 | whereto.sll_ifindex = ifr.ifr_ifindex;
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| 233 | /* The manual page incorrectly claims the address must be filled.
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| 234 | We do so because the code may change to match the docs. */
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| 235 | whereto.sll_halen = ETH_ALEN;
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| 236 | memcpy(whereto.sll_addr, outpack, ETH_ALEN);
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| 237 |
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| 238 | }
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| 239 | #else
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| 240 | whereto.sa_family = 0;
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| 241 | strcpy(whereto.sa_data, ifname);
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| 242 | #endif
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| 243 |
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| 244 | if ((i = sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto,
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| 245 | sizeof(whereto))) < 0)
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| 246 | perror("sendto");
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| 247 | else if (debug)
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| 248 | printf("Sendto worked ! %d.\n", i);
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| 249 |
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| 250 | #ifdef USE_SEND
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| 251 | if (bind(s, (struct sockaddr *)&whereto, sizeof(whereto)) < 0)
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| 252 | perror("bind");
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| 253 | else if (send(s, outpack, 100, 0) < 0)
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| 254 | perror("send");
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| 255 | #endif
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| 256 | #ifdef USE_SENDMSG
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| 257 | {
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| 258 | struct msghdr msghdr = { 0,};
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| 259 | struct iovec iovector[1];
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| 260 | msghdr.msg_name = &whereto;
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| 261 | msghdr.msg_namelen = sizeof(whereto);
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| 262 | msghdr.msg_iov = iovector;
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| 263 | msghdr.msg_iovlen = 1;
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| 264 | iovector[0].iov_base = outpack;
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| 265 | iovector[0].iov_len = pktsize;
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| 266 | if ((i = sendmsg(s, &msghdr, 0)) < 0)
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| 267 | perror("sendmsg");
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| 268 | else if (debug)
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| 269 | printf("sendmsg worked, %d (%d).\n", i, errno);
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| 270 | }
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| 271 | #endif
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| 272 |
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| 273 | return 0;
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| 274 | }
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| 275 |
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| 276 | /* Convert the host ID string to a MAC address.
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| 277 | The string may be a
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| 278 | Host name
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| 279 | IP address string
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| 280 | MAC address string
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| 281 | */
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| 282 |
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| 283 | static int get_dest_addr(const char *hostid, struct ether_addr *eaddr)
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| 284 | {
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| 285 | struct ether_addr *eap;
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| 286 |
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| 287 | eap = ether_aton(hostid);
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| 288 | if (eap) {
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| 289 | *eaddr = *eap;
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| 290 | if (debug)
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| 291 | fprintf(stderr, "The target station address is %s.\n",
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| 292 | ether_ntoa(eaddr));
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| 293 | } else if (ether_hostton(hostid, eaddr) == 0) {
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| 294 | if (debug)
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| 295 | fprintf(stderr, "Station address for hostname %s is %s.\n",
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| 296 | hostid, ether_ntoa(eaddr));
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| 297 | } else {
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| 298 | (void)fprintf(stderr,
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| 299 | "ether-wake: The Magic Packet host address must be "
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| 300 | "specified as\n"
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| 301 | " - a station address, 00:11:22:33:44:55, or\n"
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| 302 | " - a hostname with a known 'ethers' entry.\n");
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| 303 | return -1;
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| 304 | }
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| 305 | return 0;
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| 306 | }
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| 307 |
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| 308 |
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| 309 | static int get_fill(unsigned char *pkt, struct ether_addr *eaddr)
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| 310 | {
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| 311 | int offset, i;
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| 312 | unsigned char *station_addr = eaddr->ether_addr_octet;
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| 313 |
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| 314 | if (opt_broadcast)
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| 315 | memset(pkt+0, 0xff, 6);
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| 316 | else
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| 317 | memcpy(pkt, station_addr, 6);
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| 318 | memcpy(pkt+6, station_addr, 6);
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| 319 | pkt[12] = 0x08; /* Or 0x0806 for ARP, 0x8035 for RARP */
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| 320 | pkt[13] = 0x42;
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| 321 | offset = 14;
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| 322 |
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| 323 | memset(pkt+offset, 0xff, 6);
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| 324 | offset += 6;
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| 325 |
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| 326 | for (i = 0; i < 16; i++) {
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| 327 | memcpy(pkt+offset, station_addr, 6);
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| 328 | offset += 6;
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| 329 | }
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| 330 | if (debug) {
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| 331 | fprintf(stderr, "Packet is ");
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| 332 | for (i = 0; i < offset; i++)
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| 333 | fprintf(stderr, " %2.2x", pkt[i]);
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| 334 | fprintf(stderr, ".\n");
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| 335 | }
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| 336 | return offset;
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| 337 | }
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| 338 |
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| 339 | static int get_wol_pw(const char *optarg)
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| 340 | {
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| 341 | int passwd[6];
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| 342 | int byte_cnt;
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| 343 | int i;
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| 344 |
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| 345 | byte_cnt = sscanf(optarg, "%2x:%2x:%2x:%2x:%2x:%2x",
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| 346 | &passwd[0], &passwd[1], &passwd[2],
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| 347 | &passwd[3], &passwd[4], &passwd[5]);
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| 348 | if (byte_cnt < 4)
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| 349 | byte_cnt = sscanf(optarg, "%d.%d.%d.%d",
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| 350 | &passwd[0], &passwd[1], &passwd[2], &passwd[3]);
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| 351 | if (byte_cnt < 4) {
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| 352 | fprintf(stderr, "Unable to read the Wake-On-LAN password.\n");
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| 353 | return 0;
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| 354 | }
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| 355 | printf(" The Magic packet password is %2.2x %2.2x %2.2x %2.2x (%d).\n",
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| 356 | passwd[0], passwd[1], passwd[2], passwd[3], byte_cnt);
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| 357 | for (i = 0; i < byte_cnt; i++)
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| 358 | wol_passwd[i] = passwd[i];
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| 359 | return wol_passwd_sz = byte_cnt;
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| 360 | }
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| 361 |
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| 362 | #if 0
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| 363 | {
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| 364 | to = (struct sockaddr_in *)&whereto;
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| 365 | to->sin_family = AF_INET;
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| 366 | if (inet_aton(target, &to->sin_addr)) {
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| 367 | hostname = target;
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| 368 | }
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| 369 | memset (&sa, 0, sizeof sa);
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| 370 | sa.sa_family = AF_INET;
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| 371 | strncpy (sa.sa_data, interface, sizeof sa.sa_data);
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| 372 | sendto (sock, buf, bufix + len, 0, &sa, sizeof sa);
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| 373 | strncpy (sa.sa_data, interface, sizeof sa.sa_data);
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| 374 | #if 1
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| 375 | sendto (sock, buf, bufix + len, 0, &sa, sizeof sa);
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| 376 | #else
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| 377 | bind (sock, &sa, sizeof sa);
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| 378 | connect();
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| 379 | send (sock, buf, bufix + len, 0);
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| 380 | #endif
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| 381 | }
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| 382 | #endif
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| 383 |
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| 384 | |
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| 385 |
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| 386 | /*
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| 387 | * Local variables:
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| 388 | * compile-command: "gcc -O -Wall -o ether-wake ether-wake.c"
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| 389 | * c-indent-level: 4
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| 390 | * c-basic-offset: 4
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| 391 | * c-indent-level: 4
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| 392 | * tab-width: 4
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| 393 | * End:
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| 394 | */
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