void inject_initialize()
{
struct sockaddr_ll sll;
int ifindex = 0;
fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (fd == -1)
fatal(__func__, "inject module: raw socket not opened (%s)", strerror(errno));
/* Get iface index */
ifindex = get_iface_index(fd, gbls->iface);
if (ifindex == -1) {
close(fd);
fd = -1;
fatal(__func__, "inject module: invalid device index (%s)", strerror(errno));
}
memset(&sll, 0, sizeof(sll));
sll.sll_family = AF_PACKET;
sll.sll_ifindex = ifindex;
sll.sll_protocol = htons(ETH_P_ALL);
if (bind(fd, (struct sockaddr *)&sll, sizeof(sll)) == -1) {
close(fd);
fd = -1;
fatal(__func__, "inject module: bind failed (%s)", strerror(errno));
}
debug("inject module initialized");
}
int new_linrsk(const char *iface) {
int sockfd = -1;
struct timeval tm;
if (promisc_mode_on(iface)) {
sockfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
memset(&tm, 0, sizeof(tm));
tm.tv_sec = 1;
setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, &tm, sizeof(tm));
struct sockaddr_ll sll;
memset(&sll, 0, sizeof(sll));
sll.sll_family = AF_PACKET;
sll.sll_protocol = htons(ETH_P_ALL);
sll.sll_ifindex = get_iface_index(iface);
if (bind(sockfd, (struct sockaddr *)&sll, sizeof(sll)) != 0) {
del_linrsk(sockfd, iface);
return -1;
}
}
return sockfd;
}
/**
* Inner sendpacket_open() method for using Linux's PF_PACKET or TX_RING
*/
static sendpacket_t *
sendpacket_open_pf(const char *device, char *errbuf)
{
int mysocket;
sendpacket_t *sp;
struct ifreq ifr;
struct sockaddr_ll sa;
int n = 1, err;
socklen_t errlen = sizeof(err);
unsigned int UNUSED(mtu) = 1500;
assert(device);
assert(errbuf);
#if defined TX_RING
dbg(1, "sendpacket: using TX_RING");
#else
dbg(1, "sendpacket: using PF_PACKET");
#endif
/* open our socket */
if ((mysocket = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "socket: %s", strerror(errno));
return NULL;
}
/* get the interface id for the device */
if ((sa.sll_ifindex = get_iface_index(mysocket, device, errbuf)) < 0) {
close(mysocket);
return NULL;
}
/* bind socket to our interface id */
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(ETH_P_ALL);
if (bind(mysocket, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "bind error: %s", strerror(errno));
close(mysocket);
return NULL;
}
/* check for errors, network down, etc... */
if (getsockopt(mysocket, SOL_SOCKET, SO_ERROR, &err, &errlen) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "error opening %s: %s", device,
strerror(errno));
close(mysocket);
return NULL;
}
if (err > 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "error opening %s: %s", device,
strerror(err));
close(mysocket);
return NULL;
}
/* get hardware type for our interface */
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(mysocket, SIOCGIFHWADDR, &ifr) < 0) {
close(mysocket);
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Error getting hardware type: %s",
strerror(errno));
return NULL;
}
/* make sure it's not loopback (PF_PACKET doesn't support it) */
if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER)
warnx("Unsupported physical layer type 0x%04x on %s. Maybe it works, maybe it wont."
" See tickets #123/318", ifr.ifr_hwaddr.sa_family, device);
#ifdef SO_BROADCAST
/*
* man 7 socket
*
* Set or get the broadcast flag. When enabled, datagram sockets
* receive packets sent to a broadcast address and they are allowed
* to send packets to a broadcast address. This option has no
* effect on stream-oriented sockets.
*/
if (setsockopt(mysocket, SOL_SOCKET, SO_BROADCAST, &n, sizeof(n)) == -1) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE,
"SO_BROADCAST: %s", strerror(errno));
close(mysocket);
return NULL;
}
#endif /* SO_BROADCAST */
/* prep & return our sp handle */
sp = (sendpacket_t *)safe_malloc(sizeof(sendpacket_t));
strlcpy(sp->device, device, sizeof(sp->device));
sp->handle.fd = mysocket;
#ifdef HAVE_TX_RING
/* Look up for MTU */
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, sp->device, sizeof(ifr.ifr_name));
if (ioctl(mysocket, SIOCGIFMTU, &ifr) < 0) {
close(mysocket);
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Error getting MTU: %s", strerror(errno));
return NULL;
}
mtu = ifr.ifr_ifru.ifru_mtu;
/* Init TX ring for sp->handle.fd socket */
if ((sp->tx_ring = txring_init(sp->handle.fd, mtu)) == 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "txring_init: %s", strerror(errno));
close(mysocket);
return NULL;
}
sp->handle_type = SP_TYPE_TX_RING;
#else
sp->handle_type = SP_TYPE_PF_PACKET;
#endif
return sp;
}
int
recv_arp_reply(struct thread_context * tctx) {
char device[10];
xmit buf;
int s;
int cc, j;
char rcvd_src[6];
char rcvd_dest[6];
#ifndef __HTX_LINUX__
struct sockaddr_ndd_8022 sa;
#else
struct sockaddr_ll sa;
#endif
strcpy(device, &tctx->source.name);
memset(&sa, 0, sizeof (sa));
#ifndef __HTX_LINUX__
sa.sndd_8022_family = AF_NDD;
sa.sndd_8022_len = sizeof(sa);
sa.sndd_8022_filtertype = NS_TAP;
sa.sndd_8022_ethertype = (u_short)0x0806;
sa.sndd_8022_filterlen = sizeof(struct ns_8022);
bcopy(device, sa.sndd_8022_nddname, sizeof(sa.sndd_8022_nddname));
#else
sa.sll_family = PF_PACKET;
sa.sll_ifindex = get_iface_index(device);
if (sa.sll_ifindex == -1) {
printf("Unable to get device index, device = %s \n", device);
return (-1);
}
sa.sll_protocol = htons(ETH_P_ALL);
#endif
#ifndef __HTX_LINUX__
s = socket(AF_NDD, SOCK_DGRAM, NDD_PROT_ETHER);
#else
s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
#endif
if (s < 0) {
printf("%s : error opening socket errno = %d \n", __FUNCTION__, errno);
return(s);
}
if (bind(s, (struct sockaddr *)&sa, sizeof(sa))) {
printf("%s error binding to socket errno = %d \n ",__FUNCTION__, errno);
return(errno);
}
#ifndef __HTX_LINUX__
if (connect(s, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
printf("%s error connecting to socket errno = %d \n ",__FUNCTION__, errno);
return(errno);
}
#else
struct packet_mreq pkt_mreq;
memset(&pkt_mreq, 0, sizeof(struct packet_mreq));
pkt_mreq.mr_ifindex = get_iface_index(device);
pkt_mreq.mr_type = PACKET_MR_PROMISC;
if (setsockopt(s, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
&pkt_mreq, sizeof(struct packet_mreq))) {
printf("Cannot set adapter %s in Promisc mode \n",device );
return(errno);
}
#endif
do {
if ((cc = read(s, &buf, sizeof(buf))) < 0) {
printf("read failed with rc = %d, errno = %d \n", cc, errno);
return(cc);
}
if(cc) {
if(buf.arp_pkt.ea_hdr.ar_hrd != ARPHRD_ETHER)
continue;
/*
* print_rcv_buffer(buf, tctx);
*/
memcpy(rcvd_src, buf.src, (sizeof(char)*6));
memcpy(rcvd_dest, buf.dst, (sizeof(char)*6));
/* Check whether my worker thread is the source for this packet */
if(!memcmp(rcvd_dest, &tctx->source.mac_addr, (sizeof(char)*6))) {
/* Now copy the receivers details */
for(j = 0; j < tctx->num_devices; j++) {
if(!memcmp(rcvd_src, &tctx->dev_list[j].mac_addr, (sizeof(char)*6))) {
memcpy(&tctx->dest[tctx->num_reply], &tctx->dev_list[j], sizeof(struct dev_details));
tctx->rcvd_reply = 1;
tctx->num_reply++;
break;
}
}
}
}
} while(cc > 0 && !tctx->exit_helper);
close(s);
return(0);
}
int
send_arp_packet(struct dev_details source, struct dev_details dest, u_int count) {
char hwaddr[6], bcast_addr[6];
u_int size;
xmit buf;
int s;
int last;
int rc;
#ifndef __HTX_LINUX__
struct sockaddr_ndd_8022 sa;
#else
struct sockaddr_ll sa;
#endif
memcpy(hwaddr, &source.mac_addr[0], 6);
#ifdef __HTX_LINUX__
memcpy(bcast_addr, dest.mac_addr, 6);
#else
hwaddr_aton("FF:FF:FF:FF:FF:FF", bcast_addr);
#endif
count = NUM_RETRIES;
/* Building Ethernet Header */
memcpy(buf.dst, bcast_addr, sizeof(buf.dst));
memcpy(buf.src, hwaddr, sizeof(buf.src));
bcopy(hwaddr, buf.src, sizeof(buf.src));
buf.ethertype = ETHERTYPE_ARP;
/* ARP Header */
buf.arp_pkt.ea_hdr.ar_hrd = ARPHRD_ETHER;
buf.arp_pkt.ea_hdr.ar_pro = SNAP_TYPE_IP;
buf.arp_pkt.ea_hdr.ar_hln = 6;
buf.arp_pkt.ea_hdr.ar_pln = 4;
buf.arp_pkt.ea_hdr.ar_op = ARPOP_REQUEST;
/* Grat ARP Packet */
bcopy(hwaddr, buf.arp_pkt.arp_sha, sizeof(buf.arp_pkt.arp_sha));
bcopy(bcast_addr, buf.arp_pkt.arp_tha, sizeof(buf.arp_pkt.arp_tha));
#ifdef __HTX_LINUX__
s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
#else
s = socket(AF_NDD, SOCK_DGRAM, 0);
#endif
if (s < 0) {
printf("Unable to open socket s = %d, errno = %d \n", s, errno);
return(s);
}
/* Now Connect */
#ifndef __HTX_LINUX__
memset(&sa, 0, sizeof (sa));
sa.sndd_8022_family = AF_NDD;
sa.sndd_8022_len = sizeof(sa);
sa.sndd_8022_filtertype = NS_ETHERTYPE;
sa.sndd_8022_ethertype = ETHERTYPE_ARP;
sa.sndd_8022_filterlen = sizeof(struct ns_8022);
memcpy(sa.sndd_8022_nddname, &source.name, sizeof(sa.sndd_8022_nddname));
if ((rc = connect(s, (struct sockaddr *)&sa, sizeof(sa))) < 0) {
printf("failed to connect socket with source,rc = %d, errno = %s \n", rc, STRERROR(errno));
return(errno);
}
#else
sa.sll_family = AF_PACKET;
sa.sll_ifindex = get_iface_index(source.name);
if (sa.sll_ifindex == -1) {
printf("Unable to get device index, device = %s \n", source.name);
return (-1);
}
sa.sll_protocol = htons(ETH_P_ALL);
if((rc = bind(s, (struct sockaddr *)&sa, sizeof(sa))) < 0) {
printf("failed to bind socket with source,rc = %d, errno = %s \n", rc, STRERROR(errno));
return(-1);
}
struct packet_mreq pkt_mreq;
memset(&pkt_mreq, 0, sizeof(struct packet_mreq));
pkt_mreq.mr_ifindex = get_iface_index(source.name);
pkt_mreq.mr_type = PACKET_MR_PROMISC;
if (setsockopt(s, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
&pkt_mreq, sizeof(struct packet_mreq))) {
printf("Failed to set adapter %s in PROMISC mode \n", source.name );
return -1;
}
#endif
#if 0
#ifndef __HTX_LINUX__
printf("%s:%s ", sa.sndd_8022_nddname, inet_ntoa(*(struct in_addr *)buf.arp_pkt.arp_spa));
#else
printf("%s:%s ", source.name, inet_ntoa(*(struct in_addr *)buf.arp_pkt.arp_spa));
#endif
printf("----------> ");
printf("%s:",dest.name);
printf("%s ", inet_ntoa(*(struct in_addr *)buf.arp_pkt.arp_tpa));
printf("\n");
#endif
while (count-- > 0) {
#ifndef __HTX_LINUX__
if (((rc = send(s, &buf, sizeof(buf), 0)) < 0) && (errno != ENOBUFS) ) {
#else
if(((rc = write(s, &buf, sizeof(buf))) != sizeof(buf)) && (errno != ENOBUFS) ) {
#endif
printf("Failed to send a packet, rc = %d, device = %s, err = %s \n", rc, source.name, STRERROR(errno));
return(-1);
}
usleep(5);
}
close(s);
return(0);
}
int
get_iface_index(const int8_t *device) {
int sock;
struct ifreq ifr;
/* Open a generic IP socket for querying the stack */
sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (sock < 0) {
printf("Unable to open socket sock = %d, errno = %d \n", sock, errno);
return(-1);
}
/* Get interface index */
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_addr.sa_family = AF_PACKET;
strncpy (ifr.ifr_name, device, sizeof(ifr.ifr_name) - 1);
ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';
if (ioctl(sock, SIOCGIFINDEX, &ifr) == -1) {
close(sock);
return (-1);
}
close(sock);
return ifr.ifr_ifindex;
}