X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Fether-wake.c;h=6a88279f4ee42d9705928604215e1c5a5c676f3d;hb=3a9365e2732f5df2cdef758bc1f6e5e9da8fbcef;hp=83ceece805707ba7f7decb6c85530e520189d306;hpb=b662f0d58ba40cbbc1cca849fb6e8665688deb5e;p=oweals%2Fbusybox.git diff --git a/networking/ether-wake.c b/networking/ether-wake.c index 83ceece80..6a88279f4 100644 --- a/networking/ether-wake.c +++ b/networking/ether-wake.c @@ -1,10 +1,8 @@ +/* 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 source tree. * * Author: Donald Becker, http://www.scyld.com/"; http://www.scyld.com/wakeonlan.html * Busybox port: Christian Volkmann @@ -14,80 +12,72 @@ /* full usage according Donald Becker * usage: ether-wake [-i ] [-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 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 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 -#include -#include -#include -#include -#include - -#include -#include -#include -#include +//usage:#define ether_wake_trivial_usage +//usage: "[-b] [-i iface] [-p aa:bb:cc:dd[:ee:ff]] MAC" +//usage:#define ether_wake_full_usage "\n\n" +//usage: "Send a magic packet to wake up sleeping machines.\n" +//usage: "MAC must be a station address (00:11:22:33:44:55) or\n" +//usage: "a hostname with a known 'ethers' entry.\n" +//usage: "\n -b Send wake-up packet to the broadcast address" +//usage: "\n -i iface Interface to use (default eth0)" +//usage: "\n -p pass Append four or six byte password PW to the packet" + +#include "libbb.h" #include -#include -#include #include - -#ifdef __linux__ #include -#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 @@ -95,10 +85,10 @@ */ #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 @@ -109,53 +99,128 @@ void bb_debug_dump_packet(unsigned char *outpack, int pktsize) 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 + +/* 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_r(hostid, eaddr); + if (eap) { + bb_debug_msg("The target station address is %s\n\n", ether_ntoa(eap)); +#if !defined(__UCLIBC_MAJOR__) \ + || __UCLIBC_MAJOR__ > 0 \ + || __UCLIBC_MINOR__ > 9 \ + || (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ >= 30) + } 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("can't 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); -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); + return byte_cnt; +} -int etherwake_main(int argc, char *argv[]) +int ether_wake_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int ether_wake_main(int argc UNUSED_PARAM, char **argv) { - char *ifname = "eth0", *pass = NULL; - unsigned long flags; + const char *ifname = "eth0"; + char *pass; + unsigned flags; unsigned char wol_passwd[6]; int wol_passwd_sz = 0; - - int s; /* Raw socket */ + int s; /* Raw socket */ int pktsize; unsigned char outpack[1000]; struct ether_addr eaddr; - struct whereto_t whereto; /* who to wake up */ + 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); @@ -164,9 +229,8 @@ int etherwake_main(int argc, char *argv[]) { 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); @@ -193,18 +257,16 @@ int etherwake_main(int argc, char *argv[]) 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; @@ -217,84 +279,8 @@ int etherwake_main(int argc, char *argv[]) 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; -}