+/* vi: set sw=4 ts=4: */
/*
* ether-wake.c - Send a magic packet to wake up sleeping machines.
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
+ * 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>
/* 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"
+ * 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"
+ * 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";
- *
+ * 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
*
- * 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>
-
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <features.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
-#include <netdb.h>
#include <netinet/ether.h>
-
-#ifdef __linux__
#include <linux/if.h>
-#endif
-#include "busybox.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
*/
#ifdef PF_PACKET
# define whereto_t sockaddr_ll
-# define make_socket() socket(PF_PACKET, SOCK_RAW, 0)
+# define make_socket() xsocket(PF_PACKET, SOCK_RAW, 0)
#else
# define whereto_t sockaddr
-# define make_socket() socket(AF_INET, SOCK_PACKET, SOCK_PACKET)
+# define make_socket() xsocket(AF_INET, SOCK_PACKET, SOCK_PACKET)
#endif
#ifdef DEBUG
printf("packet dump:\n");
for (i = 0; i < pktsize; ++i) {
printf("%2.2x ", outpack[i]);
- if (i % 20 == 19) printf("\n");
+ if (i % 20 == 19) bb_putchar('\n');
}
printf("\n\n");
}
#else
-# define bb_debug_msg(fmt, args...)
-# define bb_debug_dump_packet(outpack, pktsize)
+# define bb_debug_msg(fmt, args...) ((void)0)
+# define bb_debug_dump_packet(outpack, pktsize) ((void)0)
#endif
-static inline void get_dest_addr(const char *arg, struct ether_addr *eaddr);
-static inline int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast);
-static inline int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd);
+/* 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();
+}
-int etherwake_main(int argc, char *argv[])
+static int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast)
{
- char *ifname = "eth0", *pass = NULL;
- unsigned long flags;
+ 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 whereto_t whereto; /* who to wake up */
/* handle misc user options */
- flags = bb_getopt_ulflags(argc, argv, "bi:p:", &ifname, &pass);
- if (optind == argc)
- bb_show_usage();
- if (pass)
+ 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();
- if (s < 0)
- bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
/* now that we have a raw socket we can drop root */
- setuid(getuid());
+ /* 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]*/);
+ pktsize = get_fill(outpack, &eaddr, flags /* & 1 OPT_BROADCAST */);
bb_debug_dump_packet(outpack, pktsize);
{
struct ifreq if_hwaddr;
- strcpy(if_hwaddr.ifr_name, ifname);
- if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0)
- bb_perror_msg_and_die("SIOCGIFHWADDR on %s failed", ifname);
+ 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);
bb_debug_dump_packet(outpack, pktsize);
/* This is necessary for broadcasts to work */
- if (flags /*& 1 [OPT_BROADCAST]*/) {
- int one = 1;
- if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (void *)&one, sizeof(one)) < 0)
+ if (flags /* & 1 OPT_BROADCAST */) {
+ if (setsockopt_broadcast(s) != 0)
bb_perror_msg("SO_BROADCAST");
}
#if defined(PF_PACKET)
{
struct ifreq ifr;
- strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
- if (ioctl(s, SIOCGIFINDEX, &ifr) == -1)
- bb_perror_msg_and_die("SIOCGIFINDEX");
+ 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;
whereto.sa_family = 0;
strcpy(whereto.sa_data, ifname);
#endif
-
- if (sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto, sizeof(whereto)) < 0)
- bb_perror_msg(bb_msg_write_error);
-
- close(s);
-
+ xsendto(s, outpack, pktsize, (struct sockaddr *)&whereto, sizeof(whereto));
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(s);
return EXIT_SUCCESS;
}
-
-/* Convert the host ID string to a MAC address.
- * The string may be a:
- * Host name
- * IP address string
- * MAC address string
-*/
-static inline 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));
- } else if (ether_hostton(hostid, eaddr) == 0) {
- bb_debug_msg("Station address for hostname %s is %s\n\n", hostid, ether_ntoa(eaddr));
- } else
- bb_show_usage();
-}
-
-static inline int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast)
-{
- int offset, i;
- unsigned char *station_addr = eaddr->ether_addr_octet;
-
- if (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;
- }
-
- return offset;
-}
-
-static inline int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd)
-{
- int 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 */
- if (byte_cnt < 4)
- byte_cnt = sscanf(ethoptarg, "%d.%d.%d.%d",
- &passwd[0], &passwd[1], &passwd[2], &passwd[3]);
- if (byte_cnt < 4) {
- bb_error_msg("Unable to read the Wake-On-LAN pass");
- return 0;
- }
-
- 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;
-}
projects / oweals / busybox.git / blobdiff