Здравствуйте, DOOM, Вы писали:
DOO>Вообще-то сырые сокеты для этого слишком высокоуровневый интерфейс. Копать надо в сторону libnet или libpcap.
Прилагаю исходник WakeOnLan, откуда взял — не помню.
Ели я не ошибаюсь, то он реализован на сырых сокетах. Причем, пакет(так называемый MagicPacket) может посылаться на конкретный mac адрес(опция -p). ???
/* 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"
...
...
...
" 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";
*/
#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:
*/
