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Finished c++ stuff (I hope)

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This commit is contained in:
DomySh
2022-07-17 17:02:27 +02:00
parent 41afb26e9d
commit 87c7d18a63
3 changed files with 26 additions and 21 deletions
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40
backend/nfqueue/nfqueue.cpp
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@@ -149,8 +149,7 @@ class NetfilterQueue {
struct mnl_socket* nl = NULL;
NetfilterQueue(u_int16_t queue_num): queue_num(queue_num) {
struct nlmsghdr *nlh;
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL) { throw runtime_error( "mnl_socket_open" );}
@@ -162,6 +161,7 @@ class NetfilterQueue {
portid = mnl_socket_get_portid(nl);
buf = (char*) malloc(BUF_SIZE);
if (!buf) {
mnl_socket_close(nl);
throw runtime_error( "allocate receive buffer" );
@@ -171,27 +171,34 @@ class NetfilterQueue {
_clear();
throw runtime_error( "mnl_socket_send" );
}
//TESTING QUEUE: TODO find a legal system to test if the queue was binded successfully
if (send_config_cmd(NFQNL_CFG_CMD_NONE) < 0) {
//TEST if BIND was successful
if (send_config_cmd(NFQNL_CFG_CMD_NONE) < 0) { // SEND A NONE cmmand to generate an error meessage
_clear();
throw runtime_error( "mnl_socket_send" );
}
if (recv_packet() == -1) {
if (recv_packet() == -1) { //RECV the error message
_clear();
throw std::runtime_error( "mnl_socket_recvfrom" );
}
/*
I checked that if this byte (that is the only one that changes) is set to 1,
this message is the NFQNL_CFG_CMD_BIND error, instead
if it is set to 0, this message is the error generated by NFQNL_CFG_CMD_NONE
So NFQNL_CFG_CMD_BIND doesn't sended any error and it's all ok.
*/
if (buf[44] == 1){
struct nlmsghdr *nlh = (struct nlmsghdr *) buf;
if (nlh->nlmsg_type != NLMSG_ERROR) {
_clear();
throw runtime_error( "unexpected packet from kernel (expected NLMSG_ERROR packet)" );
}
//nfqnl_msg_config_cmd
nlmsgerr* error_msg = (nlmsgerr *)mnl_nlmsg_get_payload(nlh);
// error code taken from the linux kernel:
// https://elixir.bootlin.com/linux/v5.18.12/source/include/linux/errno.h#L27
#define ENOTSUPP 524 /* Operation is not supported */
if (error_msg->error != -ENOTSUPP) {
_clear();
throw std::invalid_argument( "queueid is already busy" );
}
//END TESTING QUEUE
//END TESTING BIND
nlh = nfq_nlmsg_put(buf, NFQNL_MSG_CONFIG, queue_num);
nfq_nlmsg_cfg_put_params(nlh, NFQNL_COPY_PACKET, 0xffff);
@@ -271,8 +278,7 @@ class NetfilterQueue {
//Get Payload
uint16_t plen = mnl_attr_get_payload_len(attr[NFQA_PAYLOAD]);
void *payload = mnl_attr_get_payload(attr[NFQA_PAYLOAD]);
//Return result to the kernel
struct nfqnl_msg_packet_hdr *ph = (nfqnl_msg_packet_hdr*) mnl_attr_get_payload(attr[NFQA_PACKET_HDR]);
struct nfgenmsg *nfg = (nfgenmsg *)mnl_nlmsg_get_payload(nlh);
@@ -466,6 +472,4 @@ WORKDIR /tmp/jpcre2
RUN ./configure; make; make install
WORKDIR /
//NFQNL_CFG_CMD_UNBIND ???
*/