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Add the ability to dump all traffic going through route() over a control connection.

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One can get the packet stream in pcap format, which can be decoded using
tcpdump, for example:

tincctl -n <netname> pcap | tcpdump -r -
This commit is contained in:
Guus Sliepen 2011-05-22 14:17:30 +02:00
parent 54c900e961
commit 453c44e7b2
6 changed files with 109 additions and 3 deletions
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19
src/route.c
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@ -22,10 +22,12 @@
#include "splay_tree.h"
#include "connection.h"
#include "control_common.h"
#include "ethernet.h"
#include "ipv4.h"
#include "ipv6.h"
#include "logger.h"
#include "meta.h"
#include "net.h"
#include "protocol.h"
#include "route.h"
@ -39,6 +41,7 @@ bool priorityinheritance = false;
int macexpire = 600;
bool overwrite_mac = false;
mac_t mymac = {{0xFE, 0xFD, 0, 0, 0, 0}};
bool pcap = false;
/* Sizes of various headers */
@ -860,7 +863,23 @@ static void route_mac(node_t *source, vpn_packet_t *packet) {
send_packet(subnet->owner, packet);
}
static void send_pcap(vpn_packet_t *packet) {
pcap = false;
for(splay_node_t *node = connection_tree->head; node; node = node->next) {
connection_t *c = node->data;
if(!c->status.pcap)
continue;
else
pcap = true;
if(send_request(c, "%d %d %d", CONTROL, REQ_PCAP, packet->len))
send_meta(c, (char *)packet->data, packet->len);
}
}
void route(node_t *source, vpn_packet_t *packet) {
if(pcap)
send_pcap(packet);
if(forwarding_mode == FMODE_KERNEL && source != myself) {
send_packet(myself, packet);
return;