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Diffstat (limited to 'release/src/router/busybox/networking/ether-wake.c')
| -rw-r--r-- | release/src/router/busybox/networking/ether-wake.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/release/src/router/busybox/networking/ether-wake.c b/release/src/router/busybox/networking/ether-wake.c new file mode 100644 index 00000000..882429d1 --- /dev/null +++ b/release/src/router/busybox/networking/ether-wake.c @@ -0,0 +1,276 @@ +/* vi: set sw=4 ts=4: */ +/* + * ether-wake.c - Send a magic packet to wake up sleeping machines. + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * + * Author: Donald Becker, http://www.scyld.com/"; http://www.scyld.com/wakeonlan.html + * Busybox port: Christian Volkmann <haveaniceday@online.de> + * Used version of ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/"; + */ + +/* full usage according Donald Becker + * usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\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" + * + * 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" + * + * 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. +*/ + + +#include <netpacket/packet.h> +#include <net/ethernet.h> +#include <netinet/ether.h> +#include <linux/if.h> + +#include "libbb.h" + +/* 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. + */ +#ifdef PF_PACKET +# define whereto_t sockaddr_ll +# define make_socket() xsocket(PF_PACKET, SOCK_RAW, 0) +#else +# define whereto_t sockaddr +# define make_socket() xsocket(AF_INET, SOCK_PACKET, SOCK_PACKET) +#endif + +#ifdef DEBUG +# define bb_debug_msg(fmt, args...) fprintf(stderr, fmt, ## args) +void bb_debug_dump_packet(unsigned char *outpack, int pktsize) +{ + int i; + printf("packet dump:\n"); + for (i = 0; i < pktsize; ++i) { + printf("%2.2x ", outpack[i]); + if (i % 20 == 19) bb_putchar('\n'); + } + printf("\n\n"); +} +#else +# define bb_debug_msg(fmt, args...) ((void)0) +# define bb_debug_dump_packet(outpack, pktsize) ((void)0) +#endif + +/* Convert the host ID string to a MAC address. + * The string may be a: + * Host name + * IP address string + * MAC address string +*/ +static void get_dest_addr(const char *hostid, struct ether_addr *eaddr) +{ + struct ether_addr *eap; + + eap = ether_aton(hostid); + if (eap) { + *eaddr = *eap; + bb_debug_msg("The target station address is %s\n\n", ether_ntoa(eaddr)); +#if !defined(__UCLIBC__) + } else if (ether_hostton(hostid, eaddr) == 0) { + bb_debug_msg("Station address for hostname %s is %s\n\n", hostid, ether_ntoa(eaddr)); +#endif + } else + bb_show_usage(); +} + +static int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast) +{ + int i; + unsigned char *station_addr = eaddr->ether_addr_octet; + + memset(pkt, 0xff, 6); + if (!broadcast) + memcpy(pkt, station_addr, 6); + pkt += 6; + + memcpy(pkt, station_addr, 6); /* 6 */ + pkt += 6; + + *pkt++ = 0x08; /* 12 */ /* Or 0x0806 for ARP, 0x8035 for RARP */ + *pkt++ = 0x42; /* 13 */ + + memset(pkt, 0xff, 6); /* 14 */ + + for (i = 0; i < 16; ++i) { + pkt += 6; + memcpy(pkt, station_addr, 6); /* 20,26,32,... */ + } + + return 20 + 16*6; /* length of packet */ +} + +static int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd) +{ + unsigned passwd[6]; + int byte_cnt, i; + + /* handle MAC format */ + byte_cnt = sscanf(ethoptarg, "%2x:%2x:%2x:%2x:%2x:%2x", + &passwd[0], &passwd[1], &passwd[2], + &passwd[3], &passwd[4], &passwd[5]); + /* handle IP format */ +// FIXME: why < 4?? should it be < 6? + if (byte_cnt < 4) + byte_cnt = sscanf(ethoptarg, "%u.%u.%u.%u", + &passwd[0], &passwd[1], &passwd[2], &passwd[3]); + if (byte_cnt < 4) { + bb_error_msg("cannot read Wake-On-LAN pass"); + return 0; + } +// TODO: check invalid numbers >255?? + for (i = 0; i < byte_cnt; ++i) + wol_passwd[i] = passwd[i]; + + bb_debug_msg("password: %2.2x %2.2x %2.2x %2.2x (%d)\n\n", + wol_passwd[0], wol_passwd[1], wol_passwd[2], wol_passwd[3], + byte_cnt); + + return byte_cnt; +} + +int ether_wake_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int ether_wake_main(int argc UNUSED_PARAM, char **argv) +{ + const char *ifname = "eth0"; + char *pass; + unsigned flags; + unsigned char wol_passwd[6]; + int wol_passwd_sz = 0; + int s; /* Raw socket */ + int pktsize; + unsigned char outpack[1000]; + + struct ether_addr eaddr; + struct whereto_t whereto; /* who to wake up */ + + /* handle misc user options */ + opt_complementary = "=1"; + flags = getopt32(argv, "bi:p:", &ifname, &pass); + if (flags & 4) /* -p */ + wol_passwd_sz = get_wol_pw(pass, wol_passwd); + flags &= 1; /* we further interested only in -b [bcast] flag */ + + /* create the raw socket */ + s = make_socket(); + + /* now that we have a raw socket we can drop root */ + /* xsetuid(getuid()); - but save on code size... */ + + /* look up the dest mac address */ + get_dest_addr(argv[optind], &eaddr); + + /* fill out the header of the packet */ + pktsize = get_fill(outpack, &eaddr, flags /* & 1 OPT_BROADCAST */); + + bb_debug_dump_packet(outpack, pktsize); + + /* Fill in the source address, if possible. */ +#ifdef __linux__ + { + struct ifreq if_hwaddr; + + strncpy_IFNAMSIZ(if_hwaddr.ifr_name, ifname); + ioctl_or_perror_and_die(s, SIOCGIFHWADDR, &if_hwaddr, "SIOCGIFHWADDR on %s failed", ifname); + + memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6); + +# ifdef DEBUG + { + unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data; + printf("The hardware address (SIOCGIFHWADDR) of %s is type %d " + "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n\n", ifname, + if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1], + hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]); + } +# endif + } +#endif /* __linux__ */ + + bb_debug_dump_packet(outpack, pktsize); + + /* append the password if specified */ + if (wol_passwd_sz > 0) { + memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz); + pktsize += wol_passwd_sz; + } + + bb_debug_dump_packet(outpack, pktsize); + + /* This is necessary for broadcasts to work */ + if (flags /* & 1 OPT_BROADCAST */) { + if (setsockopt_broadcast(s) != 0) + bb_perror_msg("SO_BROADCAST"); + } + +#if defined(PF_PACKET) + { + struct ifreq ifr; + strncpy_IFNAMSIZ(ifr.ifr_name, ifname); + xioctl(s, SIOCGIFINDEX, &ifr); + 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 + xsendto(s, outpack, pktsize, (struct sockaddr *)&whereto, sizeof(whereto)); + if (ENABLE_FEATURE_CLEAN_UP) + close(s); + return EXIT_SUCCESS; +} |