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author | Nicolas Thill <nico@openwrt.org> | 2005-08-10 15:47:29 +0000 |
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committer | Nicolas Thill <nico@openwrt.org> | 2005-08-10 15:47:29 +0000 |
commit | 2317c9b195dd58a5ef34a898f830aa3f90fb60a7 (patch) | |
tree | 81ae106c43f0216404982ba6859aa98b7740fabc /package/ether-wake/files/ether-wake.c | |
parent | f5fa8ba25ecc5759dd383e2fc93b5d096f9eda37 (diff) | |
download | master-187ad058-2317c9b195dd58a5ef34a898f830aa3f90fb60a7.tar.gz master-187ad058-2317c9b195dd58a5ef34a898f830aa3f90fb60a7.tar.bz2 master-187ad058-2317c9b195dd58a5ef34a898f830aa3f90fb60a7.zip |
Add ether-wake package
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1595 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'package/ether-wake/files/ether-wake.c')
-rw-r--r-- | package/ether-wake/files/ether-wake.c | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/package/ether-wake/files/ether-wake.c b/package/ether-wake/files/ether-wake.c new file mode 100644 index 0000000000..eef22a7ab2 --- /dev/null +++ b/package/ether-wake/files/ether-wake.c @@ -0,0 +1,392 @@ +/* ether-wake.c: Send a magic packet to wake up sleeping machines. */ + +static char version_msg[] = +"ether-wake.c: v1.09 11/12/2003 Donald Becker, http://www.scyld.com/"; +static char brief_usage_msg[] = +"usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n" +" Use '-u' to see the complete set of options.\n"; +static char usage_msg[] = +"usage: ether-wake [-i <ifname>] [-p aa:bb:cc:dd[:ee:ff]] 00:11:22:33:44:55\n" +"\n" +" This program generates and transmits a Wake-On-LAN (WOL)\n" +" \"Magic Packet\", used for restarting machines that have been\n" +" soft-powered-down (ACPI D3-warm state).\n" +" It currently generates the standard AMD Magic Packet format, with\n" +" an optional password appended.\n" +"\n" +" The single required parameter is the Ethernet MAC (station) address\n" +" of the machine to wake or a host ID with known NSS 'ethers' entry.\n" +" The MAC address may be found with the 'arp' program while the target\n" +" machine is awake.\n" +"\n" +" Options:\n" +" -b Send wake-up packet to the broadcast address.\n" +" -D Increase the debug level.\n" +" -i ifname Use interface IFNAME instead of the default 'eth0'.\n" +" -p <pw> Append the four or six byte password PW to the packet.\n" +" A password is only required for a few adapter types.\n" +" The password may be specified in ethernet hex format\n" +" or dotted decimal (Internet address)\n" +" -p 00:22:44:66:88:aa\n" +" -p 192.168.1.1\n"; + +/* + This program generates and transmits a Wake-On-LAN (WOL) "Magic Packet", + used for restarting machines that have been soft-powered-down + (ACPI D3-warm state). It currently generates the standard AMD Magic Packet + format, with an optional password appended. + + This software may be used and distributed according to the terms + of the GNU Public License, incorporated herein by reference. + Contact the author for use under other terms. + + This source file was originally part of the network tricks package, and + is now distributed to support the Scyld Beowulf system. + Copyright 1999-2003 Donald Becker and Scyld Computing Corporation. + + The author may be reached as becker@scyld, or C/O + Scyld Computing Corporation + 914 Bay Ridge Road, Suite 220 + Annapolis MD 21403 + + Notes: + On some systems dropping root capability allows the process to be + dumped, traced or debugged. + If someone traces this program, they get control of a raw socket. + Linux handles this safely, but beware when porting this program. + + An alternative to needing 'root' is using a UDP broadcast socket, however + doing so only works with adapters configured for unicast+broadcast Rx + filter. That configuration consumes more power. +*/ + +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <errno.h> +#include <ctype.h> +#include <string.h> + +#if 0 /* Only exists on some versions. */ +#include <ioctls.h> +#endif + +#include <sys/socket.h> + +#include <sys/types.h> +#include <sys/ioctl.h> +#include <linux/if.h> + +#include <features.h> +#if __GLIBC__ >= 2 && __GLIBC_MINOR >= 1 +#include <netpacket/packet.h> +#include <net/ethernet.h> +#else +#include <asm/types.h> +#include <linux/if_packet.h> +#include <linux/if_ether.h> +#endif +#include <netdb.h> +#include <netinet/ether.h> + +/* Grrr, no consistency between include versions. + Enable this if setsockopt() isn't declared with your library. */ +#if 0 +extern int setsockopt __P ((int __fd, int __level, int __optname, + __ptr_t __optval, int __optlen)); +#else /* New, correct head files. */ +#include <sys/socket.h> +#endif + +u_char outpack[1000]; +int outpack_sz = 0; +int debug = 0; +u_char wol_passwd[6]; +int wol_passwd_sz = 0; + +static int opt_no_src_addr = 0, opt_broadcast = 0; + +static int get_dest_addr(const char *arg, struct ether_addr *eaddr); +static int get_fill(unsigned char *pkt, struct ether_addr *eaddr); +static int get_wol_pw(const char *optarg); + +int main(int argc, char *argv[]) +{ + char *ifname = "eth0"; + int one = 1; /* True, for socket options. */ + int s; /* Raw socket */ + int errflag = 0, verbose = 0, do_version = 0; + int perm_failure = 0; + int i, c, pktsize; +#if defined(PF_PACKET) + struct sockaddr_ll whereto; +#else + struct sockaddr whereto; /* who to wake up */ +#endif + struct ether_addr eaddr; + + while ((c = getopt(argc, argv, "bDi:p:uvV")) != -1) + switch (c) { + case 'b': opt_broadcast++; break; + case 'D': debug++; break; + case 'i': ifname = optarg; break; + case 'p': get_wol_pw(optarg); break; + case 'u': printf(usage_msg); return 0; + case 'v': verbose++; break; + case 'V': do_version++; break; + case '?': + errflag++; + } + if (verbose || do_version) + printf("%s\n", version_msg); + if (errflag) { + fprintf(stderr, brief_usage_msg); + return 3; + } + + if (optind == argc) { + fprintf(stderr, "Specify the Ethernet address as 00:11:22:33:44:55.\n"); + return 3; + } + + /* Note: PF_INET, SOCK_DGRAM, IPPROTO_UDP would allow SIOCGIFHWADDR to + work as non-root, but we need SOCK_PACKET to specify the Ethernet + destination address. */ +#if defined(PF_PACKET) + s = socket(PF_PACKET, SOCK_RAW, 0); +#else + s = socket(AF_INET, SOCK_PACKET, SOCK_PACKET); +#endif + if (s < 0) { + if (errno == EPERM) + fprintf(stderr, "ether-wake: This program must be run as root.\n"); + else + perror("ether-wake: socket"); + perm_failure++; + } + /* Don't revert if debugging allows a normal user to get the raw socket. */ + setuid(getuid()); + + /* We look up the station address before reporting failure so that + errors may be reported even when run as a normal user. + */ + if (get_dest_addr(argv[optind], &eaddr) != 0) + return 3; + if (perm_failure && ! debug) + return 2; + + pktsize = get_fill(outpack, &eaddr); + + /* Fill in the source address, if possible. + The code to retrieve the local station address is Linux specific. */ + if (! opt_no_src_addr) { + struct ifreq if_hwaddr; + unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data; + + strcpy(if_hwaddr.ifr_name, ifname); + if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0) { + fprintf(stderr, "SIOCGIFHWADDR on %s failed: %s\n", ifname, + strerror(errno)); + /* Magic packets still work if our source address is bogus, but + we fail just to be anal. */ + return 1; + } + memcpy(outpack+6, if_hwaddr.ifr_hwaddr.sa_data, 6); + + if (verbose) { + printf("The hardware address (SIOCGIFHWADDR) of %s is type %d " + "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.\n", ifname, + if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1], + hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]); + } + } + + if (wol_passwd_sz > 0) { + memcpy(outpack+pktsize, wol_passwd, wol_passwd_sz); + pktsize += wol_passwd_sz; + } + + if (verbose > 1) { + printf("The final packet is: "); + for (i = 0; i < pktsize; i++) + printf(" %2.2x", outpack[i]); + printf(".\n"); + } + + /* This is necessary for broadcasts to work */ + if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&one, sizeof(one)) < 0) + perror("setsockopt: SO_BROADCAST"); + +#if defined(PF_PACKET) + { + struct ifreq ifr; + strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) { + fprintf(stderr, "SIOCGIFINDEX on %s failed: %s\n", ifname, + strerror(errno)); + return 1; + } + memset(&whereto, 0, sizeof(whereto)); + whereto.sll_family = AF_PACKET; + whereto.sll_ifindex = ifr.ifr_ifindex; + /* The manual page incorrectly claims the address must be filled. + We do so because the code may change to match the docs. */ + whereto.sll_halen = ETH_ALEN; + memcpy(whereto.sll_addr, outpack, ETH_ALEN); + + } +#else + whereto.sa_family = 0; + strcpy(whereto.sa_data, ifname); +#endif + + if ((i = sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto, + sizeof(whereto))) < 0) + perror("sendto"); + else if (debug) + printf("Sendto worked ! %d.\n", i); + +#ifdef USE_SEND + if (bind(s, (struct sockaddr *)&whereto, sizeof(whereto)) < 0) + perror("bind"); + else if (send(s, outpack, 100, 0) < 0) + perror("send"); +#endif +#ifdef USE_SENDMSG + { + struct msghdr msghdr = { 0,}; + struct iovec iovector[1]; + msghdr.msg_name = &whereto; + msghdr.msg_namelen = sizeof(whereto); + msghdr.msg_iov = iovector; + msghdr.msg_iovlen = 1; + iovector[0].iov_base = outpack; + iovector[0].iov_len = pktsize; + if ((i = sendmsg(s, &msghdr, 0)) < 0) + perror("sendmsg"); + else if (debug) + printf("sendmsg worked, %d (%d).\n", i, errno); + } +#endif + + return 0; +} + +/* Convert the host ID string to a MAC address. + The string may be a + Host name + IP address string + MAC address string +*/ + +static int get_dest_addr(const char *hostid, struct ether_addr *eaddr) +{ + struct ether_addr *eap; + + eap = ether_aton(hostid); + if (eap) { + *eaddr = *eap; + if (debug) + fprintf(stderr, "The target station address is %s.\n", + ether_ntoa(eaddr)); + } else if (ether_hostton(hostid, eaddr) == 0) { + if (debug) + fprintf(stderr, "Station address for hostname %s is %s.\n", + hostid, ether_ntoa(eaddr)); + } else { + (void)fprintf(stderr, + "ether-wake: The Magic Packet host address must be " + "specified as\n" + " - a station address, 00:11:22:33:44:55, or\n" + " - a hostname with a known 'ethers' entry.\n"); + return -1; + } + return 0; +} + + +static int get_fill(unsigned char *pkt, struct ether_addr *eaddr) +{ + int offset, i; + unsigned char *station_addr = eaddr->ether_addr_octet; + + if (opt_broadcast) + memset(pkt+0, 0xff, 6); + else + memcpy(pkt, station_addr, 6); + memcpy(pkt+6, station_addr, 6); + pkt[12] = 0x08; /* Or 0x0806 for ARP, 0x8035 for RARP */ + pkt[13] = 0x42; + offset = 14; + + memset(pkt+offset, 0xff, 6); + offset += 6; + + for (i = 0; i < 16; i++) { + memcpy(pkt+offset, station_addr, 6); + offset += 6; + } + if (debug) { + fprintf(stderr, "Packet is "); + for (i = 0; i < offset; i++) + fprintf(stderr, " %2.2x", pkt[i]); + fprintf(stderr, ".\n"); + } + return offset; +} + +static int get_wol_pw(const char *optarg) +{ + int passwd[6]; + int byte_cnt; + int i; + + byte_cnt = sscanf(optarg, "%2x:%2x:%2x:%2x:%2x:%2x", + &passwd[0], &passwd[1], &passwd[2], + &passwd[3], &passwd[4], &passwd[5]); + if (byte_cnt < 4) + byte_cnt = sscanf(optarg, "%d.%d.%d.%d", + &passwd[0], &passwd[1], &passwd[2], &passwd[3]); + if (byte_cnt < 4) { + fprintf(stderr, "Unable to read the Wake-On-LAN password.\n"); + return 0; + } + printf(" The Magic packet password is %2.2x %2.2x %2.2x %2.2x (%d).\n", + passwd[0], passwd[1], passwd[2], passwd[3], byte_cnt); + for (i = 0; i < byte_cnt; i++) + wol_passwd[i] = passwd[i]; + return wol_passwd_sz = byte_cnt; +} + +#if 0 +{ + to = (struct sockaddr_in *)&whereto; + to->sin_family = AF_INET; + if (inet_aton(target, &to->sin_addr)) { + hostname = target; + } + memset (&sa, 0, sizeof sa); + sa.sa_family = AF_INET; + strncpy (sa.sa_data, interface, sizeof sa.sa_data); + sendto (sock, buf, bufix + len, 0, &sa, sizeof sa); + strncpy (sa.sa_data, interface, sizeof sa.sa_data); +#if 1 + sendto (sock, buf, bufix + len, 0, &sa, sizeof sa); +#else + bind (sock, &sa, sizeof sa); + connect(); + send (sock, buf, bufix + len, 0); +#endif +} +#endif + + +/* + * 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: + */ |