static struct nfq_handle* setup_netfilter_queue()
{
struct nfq_handle* nfq_h = NULL;
if(UNLIKELY(NULL == (nfq_h = nfq_open())))
{
fprintf(stderr,"Error: unable to initialize netfilter queue\n");
goto error;
}
if(UNLIKELY(0 > nfq_unbind_pf(nfq_h,AF_INET)))
{
fprintf(stderr,"Error: unable to unbind netfilter handle\n");
goto error;
}
if(UNLIKELY(0 > nfq_bind_pf(nfq_h,AF_INET)))
{
fprintf(stderr,"Error: unable to bind netfilter handle\n");
goto error;
}
return nfq_h;
error:
if(nfq_h) nfq_close(nfq_h);
return NULL;
}
// NF_QUEUE operations
response_t create_queue(int q_num, q_data_t **q_data, thread_data_t *data) {
response_t r;
int cq_idx;
if(get_queue_idx(q_num, q_data) == -1 && (cq_idx = get_free_idx(q_data)) >=0 ) {
q_data[cq_idx]->h = nfq_open();
if (!q_data[cq_idx]->h)
syslog(LOG_ERR, "[%d] error during nfq_open()\n\r", data->idx);
if (nfq_bind_pf(q_data[cq_idx]->h, AF_INET) < 0)
syslog(LOG_ERR, "[%d] error during nfq_bind_pf()\n\r", data->idx);
q_data[cq_idx]->qh = nfq_create_queue(q_data[cq_idx]->h, q_num, &cb, NULL);
syslog(LOG_NOTICE,"[%d] q_num: %d\n\r", data->idx, q_num);
if (!q_data[cq_idx]->qh) {
r.cs = erl_mk_atom("error");
r.rsp = erl_mk_estring("failed to create queue", strlen("failed to create queue"));
} else {
q_data[cq_idx]->q_num = q_num;
r.cs = erl_mk_atom("ok");
r.rsp = erl_mk_atom("ok");
}
} else {
r.cs = erl_mk_atom("error");
r.rsp = erl_mk_estring("queue in use", strlen("queue in use"));
}
return r;
}
QHandler::QHandler(unsigned short qid) : qid(qid)
{
// Default these to 0, so we won't handle anything.
lowerHashLimit = 0;
upperHashLimit = 0;
std::cout << "Opening library..." << std::endl;
h = nfq_open();
if (h == 0) { throw std::runtime_error("Cannot open lib"); }
// Unbind existing handler
if (nfq_unbind_pf(h, AF_INET) < 0) {
std::cerr << "error during nfq_unbind_pf() - maybe this is ok\n";
}
// Bind new handler
if (nfq_bind_pf(h, AF_INET) < 0) {
throw std::runtime_error("nfq_bind_pf failed");
}
qh = nfq_create_queue(h, QueueId, &packet_callback, this);
if (qh == 0) { throw std::runtime_error("Cannot create queue"); }
// Set packet copy mode...
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
throw std::runtime_error("nfq_set_mode failed");
}
// Get the nl handle and file descriptor...
nh = nfq_nfnlh(h);
sock = nfnl_fd(nh);
// So far so good.
// Set our socket non blocking.
SetNonBlocking(sock);
}
/* nfq initialize
*/
void fwnfq_init(void)
{
g_message("Opening library handle");
h = nfq_open();
if (!h)
g_error("Error during nfq_open()");
g_message("unbinding existing nf_queue handler for AF_INET (if any)");
if (nfq_unbind_pf(h, AF_INET) < 0)
g_warning("Error during nfq_unbind_pf()");
g_message("Binding nfnetlink_queue as nf_queue handler for AF_INET");
if (nfq_bind_pf(h, AF_INET) < 0)
g_error("Error during nfq_bind_pf()");
g_message("Binding this socket to queue '0'");
qh = nfq_create_queue(h, 0, &fwnfq_callback, NULL);
if (!qh)
g_error("Error during nfq_create_queue()\n");
g_message("Setting copy_packet mode");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0)
g_error("Can't set packet_copy mode");
nh = nfq_nfnlh(h);
fd = nfnl_fd(nh);
}
int main(int argc, char **argv)
{
struct nfq_handle *h;
struct nfq_q_handle *qh;
struct nfnl_handle *nh;
int fd;
int rv;
char buf[4096] __attribute__ ((aligned));
printf("Simple latency simulator\n");
printf("(C) 2009, 2010 by Holger Freyther\n");
printf("(C) 2005 by Harald Welte\n");
handle_options(argc, argv);
h = nfq_open();
if (!h) {
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
printf("unbinding existing nf_queue handler for AF_INET (if any)\n");
if (nfq_unbind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
printf("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
if (nfq_bind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
printf("binding this socket to queue '0'\n");
qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh) {
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
printf("setting copy_packet mode\n");
if (nfq_set_mode(qh, NFQNL_COPY_META, 0xffff) < 0) {
fprintf(stderr, "can't set packet_copy mode\n");
exit(1);
}
fd = nfq_fd(h);
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
nfq_handle_packet(h, buf, rv);
}
printf("unbinding from queue 0\n");
nfq_destroy_queue(qh);
printf("closing library handle\n");
nfq_close(h);
exit(0);
}
bool NetherNetlink::initialize()
{
nfqHandle = nfq_open();
if(!nfqHandle)
{
LOGE("Error during nfq_open()");
return (false);
}
if(nfq_unbind_pf(nfqHandle, AF_INET) < 0)
{
LOGE("Error during nfq_unbind_pf() (no permission?)");
return (false);
}
if(nfq_bind_pf(nfqHandle, AF_INET) < 0)
{
LOGE("Error during nfq_bind_pf()");
return (false);
}
queueHandle = nfq_create_queue(nfqHandle, queue, &callback, this);
if(!queueHandle)
{
LOGE("Error during nfq_create_queue()");
return (false);
}
if(nfq_set_queue_flags(queueHandle, NFQA_CFG_F_SECCTX, NFQA_CFG_F_SECCTX))
LOGI("This kernel version does not allow to retrieve security context");
if(nfq_set_mode(queueHandle, netherConfig.copyPackets ? NFQNL_COPY_PACKET : NFQNL_COPY_META, 0xffff) < 0)
{
LOGE("Can't set packet_copy mode");
nfq_destroy_queue(queueHandle);
return (false);
}
if(nfq_set_queue_flags(queueHandle, NFQA_CFG_F_UID_GID, NFQA_CFG_F_UID_GID))
{
LOGE("This kernel version does not allow to retrieve process UID/GID");
nfq_destroy_queue(queueHandle);
return (false);
}
if (netherConfig.interfaceInfo)
{
nlif = nlif_open();
if(!nlif)
LOGI("Failed to initialize NLIF subsystem, interface information won't be available");
else
nlif_query(nlif);
}
return (true);
}
int nfq()
{
int len, fd;
char buf[BUFSIZE]= {0};
struct nfq_handle *h;
//call nfq_open() to open a NFQUEUE handler
h = nfq_open();
if(!h)
{
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
//unbinging existing nf_queue handler for PE_INET(if any)
if(nfq_unbind_pf(h, PF_INET) < 0)
{
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
//binding nfnetlink_queue as nf_queue handler for PF_INET
if(nfq_bind_pf(h, PF_INET) < 0)
{
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
//binding this socket to queue '0'
gqh = nfq_create_queue(h, 0, &queue_cb, NULL);
if(!gqh)
{
fprintf(stderr,"error during nfq_create_queue()\n");
exit(1);
}
//setting copy_packet mode
if(nfq_set_mode(gqh, NFQNL_COPY_PACKET, 0xffff) < 0)
{
fprintf(stderr, "can't set packet_copy_mode\n");
exit(1);
}
//get the file descriptor associated with the nfqueue handler
fd = nfq_fd(h);
//handle a packet received from the nfqueue subsystem
CONTINUE:
while ((len = recv(fd, buf, BUFSIZE, 0)) && len >= 0)
{
nfq_handle_packet(h, buf, len);
}
debug_log("error len=%d" ,len);
sleep(2);
goto CONTINUE;
nfq_destroy_queue(gqh);
nfq_close(h);
return 0;
}
int divert_open(int port, divert_cb cb)
{
unsigned int bufsize = 1024 * 1024 * 1;
unsigned int rc;
char *m;
int fd, flags;
_h = nfq_open();
if (!_h)
err(1, "nfq_open()");
rc = nfnl_rcvbufsiz(nfq_nfnlh(_h), bufsize);
if (rc != bufsize)
xprintf(XP_DEBUG, "Buffer size %u wanted %u\n", rc, bufsize);
/* reset in case of previous crash */
if (nfq_unbind_pf(_h, AF_INET) < 0)
err(1, "nfq_unbind_pf()");
if (nfq_bind_pf(_h, AF_INET) < 0)
err(1, "nfq_bind_pf()");
_q = nfq_create_queue(_h, port, packet_input, cb);
if (!_q)
err(1, "nfq_create_queue()");
if (nfq_set_mode(_q, NFQNL_COPY_PACKET, 0xffff) < 0)
err(1, "nfq_set_mode()");
if (nfq_set_queue_maxlen(_q, 10000) < 0)
err(1, "nfq_set_queue_maxlen()");
xprintf(XP_DEFAULT,
"Divert packets using iptables -j NFQUEUE --queue-num %d\n",
port);
m = driver_param(0);
if (m) {
_mark = strtoul(m, NULL, 16);
xprintf(XP_DEFAULT, "Also, add -m mark --mark 0x0/0x%x\n",
_mark);
}
fd = nfq_fd(_h);
flags = fcntl(fd, F_GETFL);
if (flags == -1)
err(1, "fcntl()");
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
err(1, "fcntl()");
open_raw();
return fd;
}
int
tc_nfq_socket_init(struct nfq_handle **h, struct nfq_q_handle **qh,
nfq_callback *cb, int max_queue_len)
{
int fd;
tc_log_info(LOG_NOTICE, 0, "opening library handle");
*h = nfq_open();
if (!(*h)) {
tc_log_info(LOG_ERR, errno, "error during nfq_open()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0,
"unbinding existing nf_queue handler for AF_INET (if any)");
if (nfq_unbind_pf((*h), AF_INET) < 0) {
tc_log_info(LOG_ERR, errno, "error during nfq_unbind_pf()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0,
"binding nfnetlink_queue as nf_queue handler for AF_INET");
if (nfq_bind_pf((*h), AF_INET) < 0) {
tc_log_info(LOG_ERR, errno, "error during nfq_bind_pf()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0, "binding this socket to queue");
*qh = nfq_create_queue((*h), 0, cb, NULL);
if (!(*qh)) {
tc_log_info(LOG_ERR, errno, "error during nfq_create_queue()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0, "setting copy_packet mode");
if (nfq_set_mode((*qh), NFQNL_COPY_PACKET, RESP_MAX_USEFUL_SIZE) < 0) {
tc_log_info(LOG_ERR, errno, "can't set packet_copy mode");
return TC_INVALID_SOCKET;
}
if (max_queue_len > 0) {
if (nfq_set_queue_maxlen((*qh), (uint32_t) max_queue_len) < 0) {
tc_log_info(LOG_ERR, errno, "can't set queue max length:%d",
max_queue_len);
tc_log_info(LOG_WARN, 0, "unable to set queue maxlen");
tc_log_info(LOG_WARN, 0, "your kernel probably doesn't support it");
}
}
fd = nfq_fd(*h);
nfnl_rcvbufsiz(nfq_nfnlh(*h), 16777216);
return fd;
}
void* routeRecordMain(void* arg){
randomValue = createLongRandomValue();
char* gatewayIP = getIPAddress(INTERFACE);
gatewayAddr = getInAddr(gatewayIP);
initializeRRFilterList();
struct nfq_handle* h = nfq_open();
if (!h) {
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
printf("unbinding existing nf_queue handler for AF_INET (if any)\n");
if (nfq_unbind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
printf("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
if (nfq_bind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
//nfq_callback* cb = (nfq_callback*) calloc(1, sizeof(nfq_callback));
printf("binding this socket to queue '0'\n");
struct nfq_q_handle* qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh) {
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
printf("setting copy_packet mode\n");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
fprintf(stderr, "can't set packet_copy mode\n");
exit(1);
}
int fd = nfq_fd(h);
int rv = -1;
char* buf = (char*) calloc(1, 100001);
while ((rv = recv(fd, buf, 10000, 0)) >= 0) {
printf("pkt received\n received: [%d]\n\n", rv);
nfq_handle_packet(h, buf, rv);
}
printf("unbinding from queue 0\n");
nfq_destroy_queue(qh);
printf("closing library handle\n");
nfq_close(h);
pthread_exit(NULL);
}
/*
* Initialize stdin and nfq hook, then loop forever. Callback() does all the real work.
*/
int main(int argc, char **argv) {
int fd;
int rv;
char buf[4096] __attribute__ ((aligned));
if(getuid() != 0) {
fail("Only root can use me.");
}
/* make stdin non-blocking, i.e. optional */
int flags = fcntl(0, F_GETFL, 0);
flags |= O_NONBLOCK;
fcntl(0, F_SETFL, flags);
/* signal handler will close nfq hooks on exit */
if(signal(SIGINT, sig_handler) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if(signal(SIGHUP, sig_handler) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if(signal(SIGTERM, sig_handler) == SIG_IGN)
signal(SIGINT, SIG_IGN);
/* hook callback() into userspace netlink queue */
if (!(nfqh = nfq_open()))
fail("nfq_open() failed");
if (0 > nfq_unbind_pf(nfqh, AF_INET))
fail("nfq_unbind_pf failed");
if (0 > nfq_bind_pf(nfqh, AF_INET))
fail("nfq_bind_pf failed");
if (!(qh = nfq_create_queue(nfqh, 0, &callback, NULL)))
fail("nfq_create_queue failed");
if (0 > nfq_set_mode(qh, NFQNL_COPY_META, 0xffff))
fail("nfq_set_mode failed");
nh = nfq_nfnlh(nfqh);
fd = nfnl_fd(nh);
printf("Commencing packet mangling..\n");
clock_gettime(CLOCK_REALTIME, &last_time);
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0)
nfq_handle_packet(nfqh, buf, rv);
printf("Exiting..\n");
return 0;
}
/**
* This is the main function used by each worker thread that is spawned
* when the startFilterThread() method of the HostFilter class is used.
* @return 0 upon success, 1 upon failure.
*/
void* hostFilterMain(void* arg) {
// declaration of local variables
int fd;
int bytes;
char packetBuffer[1500];
struct nfq_handle *handle;
struct nfq_q_handle *queueHandle;
// attempt to open a queue connection handle from the netfilter module
if (!(handle = nfq_open())) {
std::cerr << "ERROR: nfq_open()" << std::endl;
exit(1);
}
// unbind the handle to prevent any inability to bind
if (nfq_unbind_pf(handle, AF_INET) < 0) {
std::cerr << "ERROR: nfq_unbind_pf()" << std::endl;
exit(1);
}
// bind the handle so that it can process IPv4 packets
if (nfq_bind_pf(handle, AF_INET) < 0) {
std::cerr << "ERROR: nfq_bind_pf()" << std::endl;
exit(1);
}
// create the handle for the nfq queue and ensure that it is linked to a callback
if (!(queueHandle = nfq_create_queue(handle, 0, &cb, arg))) {
std::cerr << "ERROR: nfq_create_queue()" << std::endl;
exit(1);
}
// enable all packet data for every queued packet to be copied and read into user space
if (nfq_set_mode(queueHandle, NFQNL_COPY_PACKET, 0xffff) < 0) {
std::cerr << "ERROR: packet copy mode" << std::endl;
exit(1);
}
// create a file descriptor that can be used to read from the queue
fd = nfq_fd(handle);
if (fd == -1) {
std::cerr << "ERROR: nfq_fd()" << std::endl;
exit(1);
}
// when a packet is received from the queue go and handle it with the callback
while (true) {
if ((bytes = recv(fd, packetBuffer, sizeof(packetBuffer), 0)) >= 0) {
std::cout << "A packet has been received at the queue" << std::endl;
nfq_handle_packet(handle, packetBuffer, bytes);
}
}
return NULL;
}
/*
* Open a netlink connection and returns file descriptor
*/
int netlink_open_connection(void *data)
{
struct nfnl_handle *nh;
#ifdef UFD_DEBUG
printf("opening library handle\n");
#endif
h = nfq_open();
if (!h)
{
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
#ifdef UFD_DEBUG
printf("unbinding existing nf_queue handler for AF_INET (if any)\n");
#endif
if (nfq_unbind_pf(h, AF_INET) < 0)
{
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
#ifdef UFD_DEBUG
printf("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
#endif
if (nfq_bind_pf(h, AF_INET) < 0)
{
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
#ifdef UFD_DEBUG
printf("binding this socket to queue '0'\n");
#endif
qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh)
{
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
#ifdef UFD_DEBUG
printf("setting copy_packet mode\n");
#endif
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0)
{
fprintf(stderr, "can't set packet_copy mode\n");
exit(1);
}
nh = nfq_nfnlh(h);
return nfnl_fd(nh);
}
/*-
-- qhandle = nfq.open()
Return an nfqueue qhandle on success, or nil,emsg,errno on failure.
*/
static int hopen(lua_State* L)
{
struct nfq_handle *h = nfq_open();
if(!h) {
return push_error(L);
}
lua_pushlightuserdata(L, h);
return 1;
}
int main(int argc, char** argv) {
int fd;
ssize_t rv;
char buf[4096];
struct nfq_handle* h;
struct nfq_q_handle* qh;
int i=0;
h = nfq_open();
if (!h) {
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
if (nfq_unbind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
if (nfq_bind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
printf("Binding to queue 0...\n");
qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh) {
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
printf("Copying packets...\n");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
fprintf(stderr, "error during nfq_set_mode()\n");
exit(1);
}
fd = nfq_fd(h);
memset(buf, 0, 4096);
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0)
{
for (i = 0; i < rv; i++) printf("%02x\n", *(buf+i));
printf("\n\n");
nfq_handle_packet(h, buf, rv);
}
nfq_destroy_queue(qh);
nfq_close(h);
}
static int
OpenAndConfNFqueue(){
struct nfq_q_handle *myQueue;
struct nfnl_handle *netlinkHandle;
int fd = 0, e = 0;
inet_pton(AF_INET, "239.255.255.250", &(ssdp.sin_addr));
/* Get a queue connection handle from the module */
if (!(nfqHandle = nfq_open())) {
syslog(LOG_ERR, "Error in nfq_open(): %m");
return -1;
}
/* Unbind the handler from processing any IP packets
Not totally sure why this is done, or if it's necessary... */
if ((e = nfq_unbind_pf(nfqHandle, AF_INET)) < 0) {
syslog(LOG_ERR, "Error in nfq_unbind_pf(): %m");
return -1;
}
/* Bind this handler to process IP packets... */
if (nfq_bind_pf(nfqHandle, AF_INET) < 0) {
syslog(LOG_ERR, "Error in nfq_bind_pf(): %m");
return -1;
}
/* Install a callback on queue -Q */
if (!(myQueue = nfq_create_queue(nfqHandle, nfqueue, &nfqueue_cb, NULL))) {
syslog(LOG_ERR, "Error in nfq_create_queue(): %m");
return -1;
}
/* Turn on packet copy mode */
if (nfq_set_mode(myQueue, NFQNL_COPY_PACKET, 0xffff) < 0) {
syslog(LOG_ERR, "Error setting packet copy mode (): %m");
return -1;
}
netlinkHandle = nfq_nfnlh(nfqHandle);
fd = nfnl_fd(netlinkHandle);
return fd;
}
int
tc_nfq_socket_init(struct nfq_handle **h, struct nfq_q_handle **qh,
nfq_callback *cb)
{
int fd;
tc_log_info(LOG_NOTICE, 0, "opening library handle");
*h = nfq_open();
if (!(*h)) {
tc_log_info(LOG_ERR, errno, "error during nfq_open()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0,
"unbinding existing nf_queue handler for AF_INET (if any)");
if (nfq_unbind_pf((*h), AF_INET) < 0) {
tc_log_info(LOG_ERR, errno, "error during nfq_unbind_pf()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0,
"binding nfnetlink_queue as nf_queue handler for AF_INET");
if (nfq_bind_pf((*h), AF_INET) < 0) {
tc_log_info(LOG_ERR, errno, "error during nfq_bind_pf()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0, "binding this socket to queue");
*qh = nfq_create_queue((*h), 0, cb, NULL);
if (!(*qh)) {
tc_log_info(LOG_ERR, errno, "error during nfq_create_queue()");
return TC_INVALID_SOCKET;
}
tc_log_info(LOG_NOTICE, 0, "setting copy_packet mode");
if (nfq_set_mode((*qh), NFQNL_COPY_PACKET, RESP_MAX_USEFUL_SIZE) < 0) {
tc_log_info(LOG_ERR, errno, "can't set packet_copy mode");
return TC_INVALID_SOCKET;
}
fd = nfq_fd(*h);
nfnl_rcvbufsiz(nfq_nfnlh(*h), 4096*4096);
return fd;
}
void disruptor_nfq_init() {
/* Library initialisation */
d_nfq.h = nfq_open();
if (!d_nfq.h) {
log_error("error during nfq_open()");
exit(1);
}
log_debug("unbinding existing nf_queue handler for AF_INET (if any)");
if (nfq_unbind_pf(d_nfq.h, AF_INET) < 0) {
log_error("error during nfq_unbind_pf()");
exit(1);
}
log_debug("binding nfnetlink_queue as nf_queue handler for AF_INET");
if (nfq_bind_pf(d_nfq.h, AF_INET) < 0) {
log_error("error during nfq_bind_pf()");
exit(1);
}
}
int setup_nfq()
{
g_nfq_h = nfq_open();
if (!g_nfq_h) {
log_error("error during nfq_open()");
return -1;
}
log_debug("unbinding existing nf_queue handler for AF_INET (if any)");
if (nfq_unbind_pf(g_nfq_h, AF_INET) < 0) {
log_error("error during nfq_unbind_pf()");
return -1;
}
log_debug("binding nfnetlink_queue as nf_queue handler for AF_INET");
if (nfq_bind_pf(g_nfq_h, AF_INET) < 0) {
log_error("error during nfq_bind_pf()");
return -1;
}
// set up a queue
log_debug("binding this socket to queue %d", NF_QUEUE_NUM);
g_nfq_qh = nfq_create_queue(g_nfq_h, NF_QUEUE_NUM, &cb, NULL);
if (!g_nfq_qh) {
log_error("error during nfq_create_queue()");
return -1;
}
log_debug("setting copy_packet mode");
if (nfq_set_mode(g_nfq_qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
log_error("can't set packet_copy mode");
return -1;
}
g_nfq_fd = nfq_fd(g_nfq_h);
return 0;
}
int q_setup() {
printf("opening library handle\n");
h = nfq_open();
if (!h) {
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
printf("unbinding existing nf_queue handler for AF_INET (if any)\n");
if (nfq_unbind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
printf("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
if (nfq_bind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
printf("binding this socket to queue '0'\n");
qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh) {
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
printf("setting copy_packet mode\n");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
fprintf(stderr, "can't set packet_copy mode\n");
exit(1);
}
fd = nfq_fd(h);
return 0;
}
struct nfq_handle *get_handle() {
struct nfq_handle *h;
printf("opening library handle\n");
h = nfq_open();
if (!h) {
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
printf("unbinding existing nf_queue handler for AF_INET (if any)\n");
if (nfq_unbind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
printf("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
if (nfq_bind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
return h;
}
int main(int argc, char **argv) {
struct nfq_handle *nfqHandle;
struct nfq_q_handle *myQueue;
struct nfnl_handle *netlinkHandle;
int fd, res;
char buf[BUFF_SIZE];
if (argc!=4) {
fprintf(stderr,"Error in number of arguments\n");
exit(-1);
}
// get the public IP address. And the public IP address is host byte order.
publicIP = inet_network(argv[1]);
if (publicIP == 0) {
fprintf(stderr,"Error in public IP\n");
exit(-1);
}
fprintf(stdout,"publicIP: %u\n",publicIP);
// get the subnet IP address. And the subnet IP address is host byte order.
internalIP = inet_network(argv[2]);
if (internalIP == 0) {
fprintf(stderr,"Error in internal IP\n");
exit(-1);
}
fprintf(stdout,"internalIP: %u\n",internalIP);
mask = mask << (32-atoi(argv[3]));
subnetIP = internalIP & mask;
fprintf(stdout,"subnetIP: %u\n",subnetIP);
initUdp( &udpHead );
initTcp( &tcpHead );
if ( !(nfqHandle = nfq_open())) {
fprintf(stderr, "Error in nfq_open()\n");
exit(-1);
}
if ( nfq_unbind_pf(nfqHandle, AF_INET) < 0 ) {
fprintf(stderr, "Error in nfq_unbind_pf()\n");
exit(-1);
}
if ( nfq_bind_pf(nfqHandle, AF_INET) < 0) {
fprintf(stderr, "Error in nfq_bind_pf()\n");
exit(-1);
}
if ( !(myQueue = nfq_create_queue(nfqHandle, 0, &Callback123, NULL)) ) {
fprintf(stderr, "Error in nfq_create_queue()\n");
exit(1);
}
if ( nfq_set_mode(myQueue, NFQNL_COPY_PACKET, 0xffff) <0 ) {
fprintf(stderr, "Could not set packet copy mode\n");
exit(1);
}
netlinkHandle = nfq_nfnlh(nfqHandle);
fd = nfnl_fd(netlinkHandle);
fprintf(stdout,"ready to receive packets\n");
//Start to process the packet we receive.
while ( (res = recv(fd, buf , sizeof(buf), 0)) && res>=0 ) {
printf("\n\n\n*******NEW ONE*******\n");
fprintf(stdout,"in the loop\n");
nfq_handle_packet(nfqHandle, buf , res);
}
//End the process
nfq_destroy_queue(myQueue);
nfq_close(nfqHandle);
return 0;
}
TmEcode NFQInitThread(NFQThreadVars *nfq_t, uint32_t queue_maxlen)
{
#ifndef OS_WIN32
struct timeval tv;
int opt;
#endif
NFQQueueVars *nfq_q = NFQGetQueue(nfq_t->nfq_index);
if (nfq_q == NULL) {
SCLogError(SC_ERR_NFQ_OPEN, "no queue for given index");
return TM_ECODE_FAILED;
}
SCLogDebug("opening library handle");
nfq_q->h = nfq_open();
if (!nfq_q->h) {
SCLogError(SC_ERR_NFQ_OPEN, "nfq_open() failed");
return TM_ECODE_FAILED;
}
if (nfq_g.unbind == 0)
{
/* VJ: on my Ubuntu Hardy system this fails the first time it's
* run. Ignoring the error seems to have no bad effects. */
SCLogDebug("unbinding existing nf_queue handler for AF_INET (if any)");
if (nfq_unbind_pf(nfq_q->h, AF_INET) < 0) {
SCLogError(SC_ERR_NFQ_UNBIND, "nfq_unbind_pf() for AF_INET failed");
exit(EXIT_FAILURE);
}
if (nfq_unbind_pf(nfq_q->h, AF_INET6) < 0) {
SCLogError(SC_ERR_NFQ_UNBIND, "nfq_unbind_pf() for AF_INET6 failed");
exit(EXIT_FAILURE);
}
nfq_g.unbind = 1;
SCLogDebug("binding nfnetlink_queue as nf_queue handler for AF_INET and AF_INET6");
if (nfq_bind_pf(nfq_q->h, AF_INET) < 0) {
SCLogError(SC_ERR_NFQ_BIND, "nfq_bind_pf() for AF_INET failed");
exit(EXIT_FAILURE);
}
if (nfq_bind_pf(nfq_q->h, AF_INET6) < 0) {
SCLogError(SC_ERR_NFQ_BIND, "nfq_bind_pf() for AF_INET6 failed");
exit(EXIT_FAILURE);
}
}
SCLogInfo("binding this thread %d to queue '%" PRIu32 "'", nfq_t->nfq_index, nfq_q->queue_num);
/* pass the thread memory as a void ptr so the
* callback function has access to it. */
nfq_q->qh = nfq_create_queue(nfq_q->h, nfq_q->queue_num, &NFQCallBack, (void *)nfq_t);
if (nfq_q->qh == NULL)
{
SCLogError(SC_ERR_NFQ_CREATE_QUEUE, "nfq_create_queue failed");
return TM_ECODE_FAILED;
}
SCLogDebug("setting copy_packet mode");
/* 05DC = 1500 */
//if (nfq_set_mode(nfq_t->qh, NFQNL_COPY_PACKET, 0x05DC) < 0) {
if (nfq_set_mode(nfq_q->qh, NFQNL_COPY_PACKET, 0xFFFF) < 0) {
SCLogError(SC_ERR_NFQ_SET_MODE, "can't set packet_copy mode");
return TM_ECODE_FAILED;
}
#ifdef HAVE_NFQ_MAXLEN
if (queue_maxlen > 0) {
SCLogInfo("setting queue length to %" PRId32 "", queue_maxlen);
/* non-fatal if it fails */
if (nfq_set_queue_maxlen(nfq_q->qh, queue_maxlen) < 0) {
SCLogWarning(SC_ERR_NFQ_MAXLEN, "can't set queue maxlen: your kernel probably "
"doesn't support setting the queue length");
}
}
#endif /* HAVE_NFQ_MAXLEN */
#ifndef OS_WIN32
/* set netlink buffer size to a decent value */
nfnl_rcvbufsiz(nfq_nfnlh(nfq_q->h), queue_maxlen * 1500);
SCLogInfo("setting nfnl bufsize to %" PRId32 "", queue_maxlen * 1500);
nfq_q->nh = nfq_nfnlh(nfq_q->h);
nfq_q->fd = nfnl_fd(nfq_q->nh);
NFQMutexInit(nfq_q);
/* Set some netlink specific option on the socket to increase
performance */
opt = 1;
#ifdef NETLINK_BROADCAST_SEND_ERROR
setsockopt(nfq_q->fd, SOL_NETLINK,
NETLINK_BROADCAST_SEND_ERROR, &opt, sizeof(int));
#endif
/* Don't send error about no buffer space available but drop the
packets instead */
#ifdef NETLINK_NO_ENOBUFS
setsockopt(nfq_q->fd, SOL_NETLINK, NETLINK_NO_ENOBUFS, &opt, sizeof(int));
#endif
#ifdef HAVE_NFQ_SET_QUEUE_FLAGS
if (nfq_config.flags & NFQ_FLAG_FAIL_OPEN) {
uint32_t flags = NFQA_CFG_F_FAIL_OPEN;
uint32_t mask = NFQA_CFG_F_FAIL_OPEN;
int r = nfq_set_queue_flags(nfq_q->qh, mask, flags);
if (r == -1) {
SCLogWarning(SC_ERR_NFQ_SET_MODE, "can't set fail-open mode: %s",
strerror(errno));
} else {
SCLogInfo("fail-open mode should be set on queue");
}
}
#endif
/* set a timeout to the socket so we can check for a signal
* in case we don't get packets for a longer period. */
tv.tv_sec = 1;
tv.tv_usec = 0;
if(setsockopt(nfq_q->fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1) {
SCLogWarning(SC_ERR_NFQ_SETSOCKOPT, "can't set socket timeout: %s", strerror(errno));
}
SCLogDebug("nfq_q->h %p, nfq_q->nh %p, nfq_q->qh %p, nfq_q->fd %" PRId32 "",
nfq_q->h, nfq_q->nh, nfq_q->qh, nfq_q->fd);
#else /* OS_WIN32 */
NFQMutexInit(nfq_q);
nfq_q->ovr.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
nfq_q->fd = nfq_fd(nfq_q->h);
SCLogDebug("nfq_q->h %p, nfq_q->qh %p, nfq_q->fd %p", nfq_q->h, nfq_q->qh, nfq_q->fd);
#endif /* OS_WIN32 */
return TM_ECODE_OK;
}
/* The nfq capture routine.
*/
int
nfq_capture(fko_srv_options_t *opts)
{
int res, child_pid, fd_flags;
int nfq_errcnt = 0;
int pending_break = 0;
int status;
char nfq_buf[1500];
int chk_rm_all = 0;
/* Netfilter-related handles
*/
int nfq_fd;
struct nfq_handle *nfq_h;
struct nfq_q_handle *nfq_qh;
struct nfnl_handle *nfq_nh;
nfq_h = nfq_open();
if (!nfq_h) {
log_msg(LOG_ERR, "[*] nfq_open error\n");
clean_exit(opts, FW_CLEANUP, EXIT_FAILURE);
}
/* Unbind existing nf_queue handler for AF_INET (if any)
*/
res = nfq_unbind_pf(nfq_h, AF_INET);
if (res < 0) {
log_msg(LOG_WARNING, "[*] Error during nfq_unbind_pf() error: %d\n", res);
}
/* Bind the given queue connection handle to process packets.
*/
res = nfq_bind_pf(nfq_h, AF_INET);
if ( res < 0) {
log_msg(LOG_ERR, "Error during nfq_bind_pf(), error: %d\n", res);
clean_exit(opts, FW_CLEANUP, EXIT_FAILURE);
}
/* Create queue
*/
nfq_qh = nfq_create_queue(nfq_h, atoi(opts->config[CONF_NFQ_QUEUE_NUMBER]), &process_nfq_packet, opts);
if (!nfq_qh) {
log_msg(LOG_ERR, "Error during nfq_create_queue()\n");
clean_exit(opts, FW_CLEANUP, EXIT_FAILURE);
}
/* Set the amount of data to be copied to userspace for each packet
* queued to the given queue.
*/
if (nfq_set_mode(nfq_qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
log_msg(LOG_ERR, "Can't set packet_copy mode\n");
clean_exit(opts, FW_CLEANUP, EXIT_FAILURE);
}
/* Get the netlink handle associated with the given queue connection
* handle. Then use it to get the file descriptor we will use for
* receiving the queued packets
*/
nfq_nh = nfq_nfnlh(nfq_h);
nfq_fd = nfnl_fd(nfq_nh);
/* Set our nfq handle nonblocking mode.
*
*/
if((fd_flags = fcntl(nfq_fd, F_GETFL, 0)) < 0)
{
log_msg(LOG_ERR, "nfq_capture: fcntl F_GETFL error: %s",
strerror(errno));
clean_exit(opts, FW_CLEANUP, EXIT_FAILURE);
}
fd_flags |= O_NONBLOCK;
if(fcntl(nfq_fd, F_SETFL, fd_flags) < 0)
{
log_msg(LOG_ERR, "nfq_capture: fcntl F_SETFL error setting O_NONBLOCK: %s",
strerror(errno));
exit(EXIT_FAILURE);
}
/* Initialize our signal handlers. You can check the return value for
* the number of signals that were *not* set. Those that were not set
* will be listed in the log/stderr output.
*/
if(set_sig_handlers() > 0)
log_msg(LOG_ERR, "Errors encountered when setting signal handlers.");
log_msg(LOG_INFO, "Starting fwknopd main event loop.");
/* Jump into our home-grown packet cature loop.
*/
while(1)
{
/* If we got a SIGCHLD and it was the tcp server, then handle it here.
** XXX: --DSS Do we need this here? I'm guessing we would not be using
** the TCP server in NF_QUEUE capture mode.
*/
if(got_sigchld)
{
if(opts->tcp_server_pid > 0)
{
child_pid = waitpid(0, &status, WNOHANG);
if(child_pid == opts->tcp_server_pid)
{
if(WIFSIGNALED(status))
log_msg(LOG_WARNING, "TCP server got signal: %i", WTERMSIG(status));
log_msg(LOG_WARNING,
"TCP server exited with status of %i. Attempting restart.",
WEXITSTATUS(status)
);
opts->tcp_server_pid = 0;
/* Attempt to restart tcp server ? */
usleep(1000000);
run_tcp_server(opts);
}
}
got_sigchld = 0;
}
/* Any signal except USR1, USR2, and SIGCHLD mean break the loop.
*/
if(got_signal != 0)
{
if(got_sigint || got_sigterm || got_sighup)
{
pending_break = 1;
}
else if(got_sigusr1 || got_sigusr2)
{
/* Not doing anything with these yet.
*/
got_sigusr1 = got_sigusr2 = 0;
got_signal = 0;
}
else
got_signal = 0;
}
res = recv(nfq_fd, nfq_buf, sizeof(nfq_buf), 0);
/* Count processed packets
*/
if(res > 0)
{
nfq_handle_packet(nfq_h, nfq_buf, res);
/* Count the set of processed packets (nfq_dispatch() return
* value) - we use this as a comparison for --packet-limit regardless
* of SPA packet validity at this point.
*/
opts->packet_ctr += res;
if (opts->packet_ctr_limit && opts->packet_ctr >= opts->packet_ctr_limit)
{
log_msg(LOG_WARNING,
"* Incoming packet count limit of %i reached",
opts->packet_ctr_limit
);
pending_break = 1;
}
}
/* If there was an error, complain and go on (to an extent before
* giving up).
*/
else if(res < 0 && errno != EAGAIN)
{
log_msg(LOG_ERR, "[*] Error reading from nfq descriptor: %s", strerror);
if(nfq_errcnt++ > MAX_NFQ_ERRORS_BEFORE_BAIL)
{
log_msg(LOG_ERR, "[*] %i consecutive nfq errors. Giving up",
nfq_errcnt
);
clean_exit(opts, FW_CLEANUP, EXIT_FAILURE);
}
}
else if(pending_break == 1 || res == -2)
{
log_msg(LOG_INFO, "Gracefully leaving the fwknopd event loop.");
break;
}
else
nfq_errcnt = 0;
/* Check for any expired firewall rules and deal with them.
*/
check_firewall_rules(opts, chk_rm_all);
usleep(atoi(opts->config[CONF_NFQ_LOOP_SLEEP]));
}
nfq_destroy_queue(nfq_qh);
nfq_close(nfq_h);
return(0);
}
int main(int argc, char **argv)
{
struct nfq_handle *h;
struct nfq_q_handle *qh;
struct nfnl_handle *nh;
int fd;
int rv;
char buf[4096];
printf("opening library handle\n");
h = nfq_open();
if (!h) {
fprintf(stderr, "error during nfq_open()\n");
exit(1);
}
printf("unbinding existing nf_queue handler for AF_INET (if any)\n");
if (nfq_unbind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_unbind_pf()\n");
exit(1);
}
printf("binding nfnetlink_queue as nf_queue handler for AF_INET\n");
if (nfq_bind_pf(h, AF_INET) < 0) {
fprintf(stderr, "error during nfq_bind_pf()\n");
exit(1);
}
printf("binding this socket to queue '0'\n");
qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh) {
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
printf("setting copy_packet mode\n");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
fprintf(stderr, "can't set packet_copy mode\n");
exit(1);
}
nh = nfq_nfnlh(h);
fd = nfnl_fd(nh);
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
printf("pkt received\n");
nfq_handle_packet(h, buf, rv);
}
printf("unbinding from queue 0\n");
nfq_destroy_queue(qh);
#ifdef INSANE
/* normally, applications SHOULD NOT issue this command, since
* it detaches other programs/sockets from AF_INET, too ! */
printf("unbinding from AF_INET\n");
nfq_unbind_pf(h, AF_INET);
#endif
printf("closing library handle\n");
nfq_close(h);
exit(0);
}
/*
* NFQUEUE main loop
* Reads packet and calls callback
*/
static void *nkn_nfqueue_thread(void *arg)
{
struct nfq_handle *nfq_h;
struct nfq_q_handle *nfq_q_h;
int64_t thread_id = (int64_t) arg;
char buf[65536] __attribute__ ((aligned));
int fd, rv, opt, ret;
int queue_created;
char t_name[50];
#if 0
char mem_pool_str[64];
#endif
snprintf(t_name, 50, "nfqueue-%ld", thread_id);
prctl(PR_SET_NAME, t_name, 0, 0, 0);
#if 0
snprintf(mem_pool_str, sizeof(mem_pool_str), "nfqueuemempool-%ld",
thread_id);
nkn_mem_create_thread_pool(mem_pool_str);
#endif
#ifdef PROCESS_IN_NF_THREAD
nkn_dpi_event_handle_init(thread_id);
#endif
UNUSED_ARGUMENT(arg);
while (1) {
queue_created = 0;
nfq_h = nfq_open();
if (!nfq_h) {
DBG_LOG(ERROR, MOD_DPI_URIF, "error during nfq_open()\n");
goto end;
}
if (nfq_unbind_pf(nfq_h, AF_INET) < 0) {
DBG_LOG(ERROR, MOD_DPI_URIF, "error during nfq_unbind_pf()\n");
goto end;
}
if (nfq_bind_pf(nfq_h, AF_INET) < 0) {
if (errno != EEXIST) {
DBG_LOG(ERROR, MOD_DPI_URIF, "error during nfq_bind_pf()\n");
goto end;
}
}
nfq_q_h = nfq_create_queue(nfq_h, thread_id,
&nkn_nfqueue_callback, arg);
if (!nfq_q_h) {
DBG_LOG(ERROR, MOD_DPI_URIF, "error during nfq_create_queue()\n");
goto end;
}
queue_created = 1;
if (nfq_set_mode(nfq_q_h, NFQNL_COPY_PACKET, 0xffff) < 0) {
DBG_LOG(ERROR, MOD_DPI_URIF, "can't set packet_copy mode\n");
goto end;
}
fd = nfq_fd(nfq_h);
opt = 0;
ret = setsockopt(fd, SOL_NETLINK, NETLINK_BROADCAST_SEND_ERROR,
&opt, sizeof(int));
if (ret < 0) {
DBG_LOG(ERROR, MOD_DPI_URIF,
"Failed to un set broadcast send error\n");
}
opt = 1;
ret = setsockopt(fd, SOL_NETLINK, NETLINK_NO_ENOBUFS, &opt,
sizeof(int));
if (ret < 0) {
DBG_LOG(ERROR, MOD_DPI_URIF, "Failed to set no enobug\n");
}
opt = 1024 * 1024 * 256;
ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(int));
if (ret < 0) {
DBG_LOG(ERROR, MOD_DPI_URIF, "Failed to set recv buf size\n");
}
ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &opt, sizeof(int));
if (ret < 0) {
DBG_LOG(ERROR, MOD_DPI_URIF, "Failed to set send buf size\n");
}
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
nfq_handle_packet(nfq_h, buf, rv);
}
end:;
if (queue_created)
nfq_destroy_queue(nfq_q_h);
nfq_close(nfq_h);
/*
* Wait for 2 secs before retrying
*/
sleep(2);
}
return NULL;
}
static int nfq_daq_initialize (
const DAQ_Config_t* cfg, void** handle, char* errBuf, size_t errMax)
{
if(cfg->name && *(cfg->name))
{
snprintf(errBuf, errMax, "The nfq DAQ module does not support interface or readback mode!");
return DAQ_ERROR_INVAL;
}
// setup internal stuff
NfqImpl *impl = calloc(1, sizeof(*impl));
if ( !impl )
{
snprintf(errBuf, errMax, "%s: failed to allocate nfq context\n",
__FUNCTION__);
return DAQ_ERROR_NOMEM;
}
if ( nfq_daq_get_setup(impl, cfg, errBuf, errMax) != DAQ_SUCCESS )
{
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
if ( (impl->buf = malloc(MSG_BUF_SIZE)) == NULL )
{
snprintf(errBuf, errMax, "%s: failed to allocate nfq buffer\n",
__FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR_NOMEM;
}
// setup input stuff
// 1. get a new q handle
if ( !(impl->nf_handle = nfq_open()) )
{
snprintf(errBuf, errMax, "%s: failed to get handle for nfq\n",
__FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
// 2. now use the new q handle to rip the rug out from other
// nfq users / handles? actually that doesn't seem to
// happen which is good, but then why is this *supposed*
// to be necessary? especially since we haven't bound to
// a qid yet, and that is exclusive anyway.
if (
(IP4(impl) && nfq_unbind_pf(impl->nf_handle, PF_INET) < 0) ||
(IP6(impl) && nfq_unbind_pf(impl->nf_handle, PF_INET6) < 0) )
{
snprintf(errBuf, errMax, "%s: failed to unbind protocols for nfq\n",
__FUNCTION__);
//nfq_daq_shutdown(impl);
//return DAQ_ERROR;
}
// 3. select protocols for the q handle
// this is necessary but insufficient because we still
// must configure iptables externally, eg:
//
// iptables -A OUTPUT -p icmp -j NFQUEUE [--queue-num <#>]
// (# defaults to 0).
//
// :( iptables rules should be managed automatically to avoid
// queueing packets to nowhere or waiting for packets that
// will never come. (ie this bind should take the -p, -s,
// etc args you can pass to iptables and create the dang
// rule!)
if (
(IP4(impl) && nfq_bind_pf(impl->nf_handle, PF_INET) < 0) ||
(IP6(impl) && nfq_bind_pf(impl->nf_handle, PF_INET6) < 0) )
{
snprintf(errBuf, errMax, "%s: failed to bind protocols for nfq\n",
__FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
// 4. bind to/allocate the specified nfqueue instance
// (this is the puppy specified via iptables as in
// above example.)
//
// ** there can be at most 1 nf_queue per qid
if ( !(impl->nf_queue = nfq_create_queue(
impl->nf_handle, impl->qid, daq_nfq_callback, impl)) )
{
snprintf(errBuf, errMax, "%s: nf queue creation failed\n",
__FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
// 5. configure copying for maximum overhead
if ( nfq_set_mode(impl->nf_queue, NFQNL_COPY_PACKET, IP_MAXPACKET) < 0 )
{
snprintf(errBuf, errMax, "%s: unable to set packet copy mode\n",
__FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
// 6. set queue length (optional)
if ( impl->qlen > 0 &&
nfq_set_queue_maxlen(impl->nf_queue, impl->qlen))
{
snprintf(errBuf, errMax, "%s: unable to set queue length\n",
__FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
// 7. get the q socket descriptor
// (after getting not 1 but 2 handles!)
impl->sock = nfq_fd(impl->nf_handle);
// setup output stuff
// we've got 2 handles and a socket descriptor but, incredibly,
// no way to inject?
if ( impl->device && strcasecmp(impl->device, "ip") )
{
impl->link = eth_open(impl->device);
if ( !impl->link )
{
snprintf(errBuf, errMax, "%s: can't open %s!\n",
__FUNCTION__, impl->device);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
}
else
{
impl->net = ip_open();
if ( !impl->net )
{
snprintf(errBuf, errMax, "%s: can't open ip!\n", __FUNCTION__);
nfq_daq_shutdown(impl);
return DAQ_ERROR;
}
}
impl->state = DAQ_STATE_INITIALIZED;
*handle = impl;
return DAQ_SUCCESS;
}
int queue_open(struct queue *self)
{
self->_h = nfq_open();
self->_qh = NULL;
return (self->_h != NULL);
}
static struct packet_module_state *init_state(int thread_id)
{
static const u_int16_t proto_family[] = { AF_INET, AF_INET6 };
int i;
struct packet_module_state *state = malloc(sizeof(struct packet_module_state));
if (!state) {
return NULL;
}
/* Setup nfqueue connection */
state->handle = nfq_open();
if (!state->handle) {
message(HAKA_LOG_ERROR, MODULE_NAME, L"unable to open nfqueue handle");
cleanup_state(state);
return NULL;
}
for (i=0; i<sizeof(proto_family)/sizeof(proto_family[0]); ++i) {
if (nfq_unbind_pf(state->handle, proto_family[i]) < 0) {
message(HAKA_LOG_ERROR, MODULE_NAME, L"cannot unbind queue");
cleanup_state(state);
return NULL;
}
if (nfq_bind_pf(state->handle, proto_family[i]) < 0) {
message(HAKA_LOG_ERROR, MODULE_NAME, L"cannot bind queue");
cleanup_state(state);
return NULL;
}
state->send_fd = open_send_socket(false);
if (state->send_fd < 0) {
cleanup_state(state);
return NULL;
}
state->send_mark_fd = open_send_socket(true);
if (state->send_fd < 0) {
cleanup_state(state);
return NULL;
}
}
state->queue = nfq_create_queue(state->handle, thread_id,
&packet_callback, state);
if (!state->queue) {
message(HAKA_LOG_ERROR, MODULE_NAME, L"cannot create queue");
cleanup_state(state);
return NULL;
}
if (nfq_set_mode(state->queue, NFQNL_COPY_PACKET,
PACKET_BUFFER_SIZE) < 0) {
message(HAKA_LOG_ERROR, MODULE_NAME, L"cannot set mode to copy packet");
cleanup_state(state);
return NULL;
}
state->fd = nfq_fd(state->handle);
/* Change nfq queue len and netfilter receive size */
if (nfq_set_queue_maxlen(state->queue, nfqueue_len) < 0) {
message(HAKA_LOG_WARNING, MODULE_NAME, L"cannot change netfilter queue len");
}
nfnl_rcvbufsiz(nfq_nfnlh(state->handle), nfqueue_len * 1500);
return state;
}
int main(int argc, char **argv)
{
struct nfq_handle *h;
struct nfq_q_handle *qh;
int fd;
int rv;
char buf[4096] __attribute__ ((aligned));
printf("Obteniendo el handle de la libreria: ");
h = nfq_open();
if (!h)
{
fprintf(stderr, "Ha fallado\n");
exit(1);
}
else printf(" OK !\n");
printf("Haciendo unbind (por si existe alguno de AF_INET): ");
if (nfq_unbind_pf(h, AF_INET) < 0)
{
fprintf(stderr, "error nfq_unbind_pf()\n");
exit(1);
}
else printf(" OK!\n");
printf("Vinculando nfnetlink_queue de tipo nf_queue handler para AF_INET:");
if (nfq_bind_pf(h, AF_INET) < 0)
{
fprintf(stderr, "error nfq_bind_pf()\n");
exit(1);
}
else printf(" OK!\n");
printf("Creando la vinculacion de la funcion callback con Queue 0, socket receptor: ");
qh = nfq_create_queue(h, 0, &cb, NULL);
if (!qh) {
fprintf(stderr, "error during nfq_create_queue()\n");
exit(1);
}
else printf(" OK !\n");
printf("Definiendo que cantidad de paquete queremos recibir (no queremos todo para estas pruebas): ");
if (nfq_set_mode(qh, NFQNL_COPY_PACKET, 0xffff) < 0) {
fprintf(stderr, "FALLO el COPY_META mode\n");
exit(1);
}
else printf("OK\n");
fd = nfq_fd(h);
printf("Realizando conexión a memcache: ");
memc= memcached_create(NULL);
servers= memcached_server_list_append(servers, "localhost", 11211, &rc);
rc= memcached_server_push(memc, servers);
if (rc == MEMCACHED_SUCCESS)
printf(" OK ! \n");
else {
printf("error conectando a memcache: %s\n",memcached_strerror(memc, rc));
exit(0);
}
printf("Realizando INIT de MySQL: ");
con = mysql_init(NULL);
if (con == NULL)
{
printf(" FAIL\n");
exit(1);
}
else printf("OK\n");
printf("Realizando Conexion a MYQSL: ");
if (mysql_real_connect(con, "localhost", "root", "FIXMEPASSWORD", "nfqueue", 0, NULL, 0) == NULL)
{
printf(" FAILED\n");
exit(1);
}
else printf(" OKI\n");
printf("Todo Listo !\n Entrando en bucle principal de recepcion ..\n");
while ((rv = recv(fd, buf, sizeof(buf), 0)))
{
// Si todo ha ido bien, gestionamos el paquete:
if (rv>=0)
nfq_handle_packet(h, buf, rv);
// es posible que tengamos packet loss porque
// nuestro codigo es lento y se llena la queue:
else if ( errno == ENOBUFS)
{
fflush(stdout);
printf("!");
}
// O "simplemente", que algo haya ido mal:
else {
printf("ERROR \n");
fflush(stdout);
break;
}
}
// Teoricamente, nunca llegaremos aqui, pero si llegamos
// Habra que liberar bien y tal:
printf("unbinding de queue 0\n");
nfq_destroy_queue(qh);
printf("cerrando library handle\n");
nfq_close(h);
exit(0);
}