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Don't parse node IDs if the sending node doesn't support them.

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Currently, tinc tries to parse node IDs for all SPTPS packets, including
ones sent from older, pre-node-IDs tinc-1.1 nodes, and therefore doesn't
recognize packets from these nodes. This commit fixes that.

It also makes code slightly clearer by reducing the amount of fiddling
around packet offset/length.
This commit is contained in:
Etienne Dechamps 2015-05-18 20:48:45 +01:00
parent 643149b449
commit fef29d0193
1 changed files with 11 additions and 7 deletions
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18
src/net_packet.c
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@ -282,9 +282,8 @@ static bool receive_udppacket(node_t *n, vpn_packet_t *inpkt) {
}
return false;
}
inpkt->offset += 2 * sizeof(node_id_t);
n->status.udppacket = true;
bool result = sptps_receive_data(&n->sptps, DATA(inpkt), inpkt->len - 2 * sizeof(node_id_t));
bool result = sptps_receive_data(&n->sptps, DATA(inpkt), inpkt->len);
n->status.udppacket = false;
if(!result) {
@ -1440,10 +1439,16 @@ skip_harder:
return;
}
if(n->status.sptps) {
pkt.offset = 2 * sizeof(node_id_t);
pkt.offset = 0;
if(!memcmp(DSTID(&pkt), &nullid, sizeof nullid)) {
if(n->status.sptps) {
bool relay_enabled = (n->options >> 24) >= 4;
if (relay_enabled) {
pkt.offset = 2 * sizeof(node_id_t);
pkt.len -= pkt.offset;
}
if(!memcmp(DSTID(&pkt), &nullid, sizeof nullid) || !relay_enabled) {
direct = true;
from = n;
to = myself;
@ -1468,7 +1473,7 @@ skip_harder:
/* If we're not the final recipient, relay the packet. */
if(to != myself) {
send_sptps_data(to, from, 0, DATA(&pkt), pkt.len - 2 * sizeof(node_id_t));
send_sptps_data(to, from, 0, DATA(&pkt), pkt.len);
try_tx_sptps(to, true);
return;
}
@ -1477,7 +1482,6 @@ skip_harder:
from = n;
}
pkt.offset = 0;
if(!receive_udppacket(from, &pkt))
return;