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Queue bind success check (in an illegal way)

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This commit is contained in:
DomySh
2022-07-16 13:26:07 +02:00
parent 76cd4f7407
commit f3f74f4671
2 changed files with 24 additions and 7 deletions
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backend/nfqueue/nfqueue
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31
backend/nfqueue/nfqueue.cpp
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@@ -94,7 +94,6 @@ struct regex_rules{
shared_ptr<regex_rules> regex_config;
typedef bool NetFilterQueueCallback(const uint8_t*,uint32_t);
typedef struct mnl_socket* NetFilterQueueSocket;
PDU * find_transport_layer(PDU* pkt){
while(pkt != NULL){
@@ -113,7 +112,7 @@ class NetfilterQueue {
char *buf = NULL;
unsigned int portid;
u_int16_t queue_num;
NetFilterQueueSocket nl = NULL;
struct mnl_socket* nl = NULL;
NetfilterQueue(u_int16_t queue_num): queue_num(queue_num) {
@@ -122,7 +121,7 @@ class NetfilterQueue {
if (nl == NULL) { throw runtime_error( "mnl_socket_open" );}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { throw std::runtime_error( "mnl_socket_bind" );}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { throw runtime_error( "mnl_socket_bind" );}
portid = mnl_socket_get_portid(nl);
buf = (char*) malloc(BUF_SIZE);
@@ -130,15 +129,33 @@ class NetfilterQueue {
nlh = nfq_nlmsg_put(buf, NFQNL_MSG_CONFIG, queue_num);
nfq_nlmsg_cfg_put_cmd(nlh, AF_INET, NFQNL_CFG_CMD_BIND);
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
free(buf);
throw runtime_error( "mnl_socket_send" );
}
//TESTING QUEUE: TODO find a legal system to test if the queue was binded successfully
nlh = nfq_nlmsg_put(buf, NFQNL_MSG_CONFIG, queue_num);
nfq_nlmsg_cfg_put_cmd(nlh, AF_INET, NFQNL_CFG_CMD_NONE);
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
free(buf);
throw runtime_error( "mnl_socket_send" );
}
int ret = mnl_socket_recvfrom(nl, buf, BUF_SIZE);
if (ret == -1) {
free(buf);
throw std::runtime_error( "mnl_socket_recvfrom" );
}
if (buf[44] == 1){
free(buf);
throw std::invalid_argument( "queueid is already busy" );
}
//END TESTING QUEUE
nlh = nfq_nlmsg_put(buf, NFQNL_MSG_CONFIG, queue_num);
nfq_nlmsg_cfg_put_params(nlh, NFQNL_COPY_PACKET, 0xffff);
mnl_attr_put_u32(nlh, NFQA_CFG_FLAGS, htonl(NFQA_CFG_F_GSO));
mnl_attr_put_u32(nlh, NFQA_CFG_MASK, htonl(NFQA_CFG_F_GSO));
@@ -147,8 +164,6 @@ class NetfilterQueue {
throw runtime_error( "mnl_socket_send" );
}
}
void run(){
@@ -184,7 +199,7 @@ class NetfilterQueue {
static int queue_cb(const struct nlmsghdr *nlh, void *data)
{
NetFilterQueueSocket nl = (NetFilterQueueSocket)data;
struct mnl_socket* nl = (struct mnl_socket*)data;
//Extract attributes from the nlmsghdr
struct nlattr *attr[NFQA_MAX+1] = {};
@@ -397,4 +412,6 @@ WORKDIR /tmp/jpcre2
RUN ./configure; make; make install
WORKDIR /
//NFQNL_CFG_CMD_UNBIND ???
*/