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/*
Mac-Telnet - Connect to RouterOS or mactelnetd devices via MAC address
Copyright (C) 2010, Håkon Nessjøen <haakon.nessjoen@gmail.com>
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <libintl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/ether.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/ioctl.h>
#ifndef __linux__
#include <net/if_dl.h>
#include <net/bpf.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#else
#include <linux/if_packet.h>
#endif
#include "protocol.h"
#include "interfaces.h"
#define _(String) gettext (String)
struct net_interface *net_get_interface_ptr(struct net_interface *interfaces, int max_devices, char *name, int create) {
int i;
for (i = 0; i < max_devices; ++i) {
if (!interfaces[i].in_use)
break;
if (strncmp(interfaces[i].name, name, 254) == 0) {
return interfaces + i;
}
}
if (create && i < max_devices) {
interfaces[i].in_use = 1;
strncpy(interfaces[i].name, name, 254);
interfaces[i].name[254] = '\0';
return interfaces + i;
}
return NULL;
}
#ifdef __linux__
static void net_update_mac(struct net_interface *interfaces, int max_devices) {
unsigned char emptymac[] = {0, 0, 0, 0, 0, 0};
struct ifreq ifr;
int i,tmpsock;
tmpsock = socket(PF_INET, SOCK_DGRAM, 0);
if (tmpsock < 0) {
perror("net_update_mac");
exit(1);
}
for (i = 0; i < max_devices; ++i) {
if (interfaces[i].in_use) {
/* Find interface hardware address from device_name */
strncpy(ifr.ifr_name, interfaces[i].name, 16);
if (ioctl(tmpsock, SIOCGIFHWADDR, &ifr) == 0) {
/* Fetch mac address */
memcpy(interfaces[i].mac_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
if (memcmp(interfaces[i].mac_addr, &emptymac, ETH_ALEN) != 0) {
interfaces[i].has_mac = 1;
}
}
}
}
close(tmpsock);
}
static int get_device_index(char *device_name) {
struct ifreq ifr;
int tmpsock;
tmpsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
/* Find interface index from device_name */
strncpy(ifr.ifr_name, device_name, 16);
if (ioctl(tmpsock, SIOCGIFINDEX, &ifr) != 0) {
return -1;
}
/* Return interface index */
return ifr.ifr_ifindex;
}
#endif
int net_get_interfaces(struct net_interface *interfaces, int max_devices) {
static struct ifaddrs *int_addrs;
static const struct ifaddrs *int_cursor;
const struct sockaddr_in *dl_addr;
int found = 0;
if (getifaddrs(&int_addrs) < 0) {
perror("getifaddrs");
exit(1);
}
for (int_cursor = int_addrs; int_cursor != NULL; int_cursor = int_cursor->ifa_next) {
dl_addr = (const struct sockaddr_in *) int_cursor->ifa_addr;
if (int_cursor->ifa_addr == NULL)
continue;
if (int_cursor->ifa_addr->sa_family == AF_INET) {
struct net_interface *interface = net_get_interface_ptr(interfaces, max_devices, int_cursor->ifa_name, 1);
if (interface != NULL) {
found++;
memcpy(interface->ipv4_addr, &dl_addr->sin_addr, IPV4_ALEN);
}
#ifdef __linux__
interface->ifindex = get_device_index(interface->name);
#endif
}
#ifndef __linux__
{
unsigned char emptymac[] = {0, 0, 0, 0, 0, 0};
struct sockaddr_dl *sdl = (struct sockaddr_dl *)int_cursor->ifa_addr;
if (sdl->sdl_alen == ETH_ALEN) {
struct net_interface *interface = net_get_interface_ptr(interfaces, max_devices, int_cursor->ifa_name, 1);
memcpy(interface->mac_addr, LLADDR(sdl), ETH_ALEN);
if (interface != NULL && memcmp(interface->mac_addr, &emptymac, ETH_ALEN) != 0) {
interface->has_mac = 1;
}
}
}
#endif
}
freeifaddrs(int_addrs);
#ifdef __linux__
net_update_mac(interfaces, max_devices);
#endif
#if 0
{
int i = 0;
for (i = 0; i < max_devices; ++i) {
if (interfaces[i].in_use) {
struct in_addr *addr = (struct in_addr *)interfaces[i].ipv4_addr;
printf("Interface %s:\n", interfaces[i].name);
printf("\tIP: %s\n", inet_ntoa(*addr));
printf("\tMAC: %s\n", ether_ntoa((struct ether_addr *)interfaces[i].mac_addr));
#ifdef __linux__
printf("\tIfIndex: %d\n", interfaces[i].ifindex);
#endif
printf("\n");
}
}
}
#endif
return found;
}
unsigned short in_cksum(unsigned short *addr, int len)
{
int nleft = len;
int sum = 0;
unsigned short *w = addr;
unsigned short answer = 0;
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
if (nleft == 1) {
*(unsigned char *) (&answer) = *(unsigned char *) w;
sum += answer;
}
sum = (sum >> 16) + (sum & 0xFFFF);
sum += (sum >> 16);
answer = ~sum;
return (answer);
}
unsigned short udp_sum_calc(unsigned char *src_addr,unsigned char *dst_addr, unsigned char *data, unsigned short len) {
unsigned short prot_udp=17;
unsigned short padd=0;
unsigned short word16;
unsigned int sum = 0;
int i;
/* Padding ? */
padd = (len % 2);
if (padd) {
data[len] = 0;
}
/* header+data */
for (i = 0; i < len + padd; i += 2){
word16 = ((data[i] << 8) & 0xFF00) + (data[i + 1] & 0xFF);
sum += word16;
}
/* source ip */
for (i = 0; i < IPV4_ALEN; i += 2){
word16 = ((src_addr[i] << 8) & 0xFF00) + (src_addr[i + 1] & 0xFF);
sum += word16;
}
/* dest ip */
for (i = 0; i < IPV4_ALEN; i += 2){
word16 = ((dst_addr[i] << 8) & 0xFF00) + (dst_addr[i + 1] & 0xFF);
sum += word16;
}
sum += prot_udp + len;
while (sum>>16)
sum = (sum & 0xFFFF) + (sum >> 16);
sum = ~sum;
if (sum == 0)
sum = 0xFFFF;
return (unsigned short) sum;
}
int net_init_raw_socket(struct net_interface *interface) {
int fd;
#ifdef __linux__
/* Transmit raw packets with this socket */
fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (fd < 0) {
perror("raw_socket");
exit(1);
}
#else
/* Transmit raw packets with bpf */
fd = open("/dev/bpf0", O_RDWR);
if (fd <= 0) {
perror("open_bpf");
exit(1);
}
#endif
return fd;
}
int net_send_udp(const int fd, struct net_interface *interface, const unsigned char *sourcemac, const unsigned char *destmac, const struct in_addr *sourceip, const int sourceport, const struct in_addr *destip, const int destport, const unsigned char *data, const int datalen) {
#ifdef __linux__
struct sockaddr_ll socket_address;
#endif
/*
* Create a buffer for the full ethernet frame
* and align header pointers to the correct positions.
*/
void* buffer = (void*)malloc(ETH_FRAME_LEN);
struct ethhdr *eh = (struct ethhdr *)buffer;
struct iphdr *ip = (struct iphdr *)(buffer + 14);
struct udphdr *udp = (struct udphdr *)(buffer + 14 + 20);
unsigned char *rest = (unsigned char *)(buffer + 20 + 14 + sizeof(struct udphdr));
if (((void *)rest - (void*)buffer) + datalen > ETH_FRAME_LEN) {
fprintf(stderr, _("packet size too large\n"));
free(buffer);
return 0;
}
static unsigned int id = 1;
int send_result = 0;
/* Abort if we couldn't allocate enough memory */
if (buffer == NULL) {
perror("malloc");
exit(1);
}
/* Init ethernet header */
memcpy(eh->h_source, sourcemac, ETH_ALEN);
memcpy(eh->h_dest, destmac, ETH_ALEN);
eh->h_proto = htons(ETH_P_IP);
#ifdef __linux__
/* Init SendTo struct */
socket_address.sll_family = AF_PACKET;
socket_address.sll_protocol = htons(ETH_P_IP);
socket_address.sll_ifindex = interface->ifindex;
socket_address.sll_hatype = ARPHRD_ETHER;
socket_address.sll_pkttype = PACKET_OTHERHOST;
socket_address.sll_halen = ETH_ALEN;
memcpy(socket_address.sll_addr, eh->h_source, ETH_ALEN);
socket_address.sll_addr[6] = 0x00;/*not used*/
socket_address.sll_addr[7] = 0x00;/*not used*/
#endif
/* Init IP Header */
ip->version = 4;
ip->ihl = 5;
ip->tos = 0x10;
ip->tot_len = htons(datalen + 8 + 20);
ip->id = htons(id++);
ip->frag_off = htons(0x4000);
ip->ttl = 64;
ip->protocol = 17; /* UDP */
ip->check = 0x0000;
ip->saddr = sourceip->s_addr;
ip->daddr = destip->s_addr;
/* Calculate checksum for IP header */
ip->check = in_cksum((unsigned short *)ip, sizeof(struct iphdr));
/* Init UDP Header */
udp->source = htons(sourceport);
udp->dest = htons(destport);
udp->len = htons(sizeof(struct udphdr) + datalen);
udp->check = 0;
/* Insert actual data */
memcpy(rest, data, datalen);
/* Add UDP checksum */
udp->check = udp_sum_calc((unsigned char *)&(ip->saddr), (unsigned char *)&(ip->daddr), (unsigned char *)udp, sizeof(struct udphdr) + datalen);
udp->check = htons(udp->check);
#ifdef __linux__
/* Send the packet */
send_result = sendto(fd, buffer, datalen + 8 + 14 + 20, 0, (struct sockaddr*)&socket_address, sizeof(socket_address));
if (send_result == -1)
perror("sendto");
#else
{
struct ifreq req_if;
/* Pick device to send through */
strcpy(req_if.ifr_name, interface->name);
if (ioctl(fd, BIOCSETIF, &req_if) > 0) {
perror("ioctl_BIOCSETIF");
exit(1);
}
}
send_result = write(fd, buffer, datalen + 8 + 14 + 20);
if (send_result == -1)
perror("bpf_write");
#endif
free(buffer);
/* Return amount of _data_ bytes sent */
if (send_result - 8 - 14 - 20 < 0) {
return 0;
}
return send_result - 8 - 14 - 20;
}
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