import ether-wake applet by haveaniceday Bug 252

1 files changed, 300 insertions, 0 deletions

diff --git a/networking/ether-wake.c b/networking/ether-wake.c
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--- /dev/null
+++ b/networking/ether-wake.c
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+/*
+ * 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.
+ *
+ * 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 <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"
+
+/* 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() socket(PF_PACKET, SOCK_RAW, 0)
+#else
+# define whereto_t sockaddr
+# define make_socket() socket(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) printf("\n");
+	}
+	printf("\n\n");
+}
+#else
+# define bb_debug_msg(fmt, args...)
+# define bb_debug_dump_packet(outpack, pktsize)
+#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);
+
+int etherwake_main(int argc, char *argv[])
+{
+	char *ifname = "eth0", *pass = NULL;
+	unsigned long 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 */
+	flags = bb_getopt_ulflags(argc, argv, "bi:p:", &ifname, &pass);
+	if (optind == argc)
+		bb_show_usage();
+	if (pass)
+		wol_passwd_sz = get_wol_pw(pass, wol_passwd);
+
+	/* 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());
+
+	/* 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;
+
+		strcpy(if_hwaddr.ifr_name, ifname);
+		if (ioctl(s, SIOCGIFHWADDR, &if_hwaddr) < 0)
+			bb_perror_msg_and_die("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]*/) {
+		int one = 1;
+		if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, (void *)&one, sizeof(one)) < 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");
+		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 (sendto(s, outpack, pktsize, 0, (struct sockaddr *)&whereto, sizeof(whereto)) < 0)
+		bb_perror_msg(bb_msg_write_error);
+
+	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;
+}