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35 Commits

Author SHA1 Message Date
Felix Lange 3f047be5aa all: update license headers to distiguish GPL/LGPL 
All code outside of cmd/ is licensed as LGPL. The headers
now reflect this by calling the whole work "the go-ethereum library".
 2015-07-22 18:51:45 +02:00
Felix Lange ea54283b30 all: update license information 2015-07-07 14:12:44 +02:00
Felix Lange 261a8077c4 p2p/discover: deflake TestUDP_successfulPing 2015-06-10 13:08:21 +02:00
Péter Szilágyi 612f01400f p2p/discover: bond with seed nodes too (runs only if findnode failed) 2015-05-26 23:30:41 +02:00
Péter Szilágyi 3630432dfb p2p/discovery: fix a cornercase loop if no seeds or bootnodes are known 2015-05-26 23:30:40 +02:00
Péter Szilágyi f539ed1e66 p2p/discover: force refresh if the table is empty 2015-05-26 23:30:40 +02:00
Péter Szilágyi 5076170f34 p2p/discover: permit temporary bond failures for previously known nodes 2015-05-26 23:30:40 +02:00
Péter Szilágyi 6078aa08eb p2p/discover: watch find failures, evacuate on too many, rebond if failed 2015-05-26 23:30:40 +02:00
Felix Lange 9f38ef5d97 p2p/discover: add ReadRandomNodes 2015-05-25 01:17:14 +02:00
Péter Szilágyi cbd3ae6906 p2p/discover: fix #838, evacuate self entries from the node db 2015-05-21 19:41:46 +03:00
Felix Lange 7fa2607bd1 p2p/discover: bump maxBondingPingPongs to 16 
This should increase the speed a bit because all findnode
results (up to 16) can be verified at the same time.
 2015-05-14 14:53:29 +02:00
Felix Lange 2adcc31bb4 p2p/discover: new distance metric based on sha3(id) 
The previous metric was pubkey1^pubkey2, as specified in the Kademlia
paper. We missed that EC public keys are not uniformly distributed.
Using the hash of the public keys addresses that. It also makes it
a bit harder to generate node IDs that are close to a particular node.
 2015-05-06 16:10:41 +02:00
Felix Lange 72ab6d3255 p2p/discover: track sha3(ID) in Node 2015-04-30 15:02:23 +02:00
Felix Lange fc747ef4a6 p2p/discover: new endpoint format 
This commit changes the discovery protocol to use the new "v4" endpoint
format, which allows for separate UDP and TCP ports and makes it
possible to discover the UDP address after NAT.
 2015-04-30 14:57:33 +02:00
Péter Szilágyi 4992765032 p2p/discover: fix goroutine leak due to blocking on sync.Once 2015-04-28 10:28:04 +03:00
Péter Szilágyi 437cf4b3ac p2p/discover: add node expirer and related tests 2015-04-27 17:38:28 +03:00
Péter Szilágyi a136e2bb22 p2p/discover: parametrize nodedb version, add persistency tests 2015-04-27 15:28:17 +03:00
Péter Szilágyi 706da56f75 p2p/discover: wrap the pinger to update the node db too 2015-04-27 14:56:42 +03:00
Péter Szilágyi 8de8f61d36 p2p/discover: write the basic tests, catch RLP bug 2015-04-27 12:33:06 +03:00
Péter Szilágyi 0201c04b95 p2p/discovery: fix issues raised in the nodeDb PR 2015-04-27 10:19:16 +03:00
Péter Szilágyi 8646365b42 cmd/bootnode, eth, p2p, p2p/discover: use a fancier db design 2015-04-24 18:04:41 +03:00
Péter Szilágyi 6def110c37 cmd/bootnode, eth, p2p, p2p/discover: clean up the seeder and mesh into eth. 2015-04-24 11:33:55 +03:00
Péter Szilágyi af923c965f p2p/discovery: use the seed table for finding nodes, auto drop stale ones 2015-04-24 11:23:20 +03:00
Péter Szilágyi 5f735d6fce cmd, eth, p2p, p2p/discover: init and clean up the seed cache 2015-04-24 11:23:20 +03:00
Felix Lange 936c8e19ff p2p/discover: store nodes in leveldb 2015-04-24 11:23:20 +03:00
Felix Lange b8aeb04f6f p2p/discover: remove unused field Node.activeStamp 2015-04-13 17:44:14 +02:00
Felix Lange a77c431e37 p2p/discover: fix off by one error causing buckets to contain duplicates 2015-04-01 17:00:12 +02:00
Felix Lange de7af720d6 p2p/discover: implement node bonding 
This a fix for an attack vector where the discovery protocol could be
used to amplify traffic in a DDOS attack. A malicious actor would send a
findnode request with the IP address and UDP port of the target as the
source address. The recipient of the findnode packet would then send a
neighbors packet (which is 16x the size of findnode) to the victim.

Our solution is to require a 'bond' with the sender of findnode. If no
bond exists, the findnode packet is not processed. A bond between nodes
α and β is created when α replies to a ping from β.

This (initial) version of the bonding implementation might still be
vulnerable against replay attacks during the expiration time window.
We will add stricter source address validation later.
 2015-04-01 17:00:12 +02:00
zelig e150832734 p2p: server>discover table Self=Node exported 2015-03-15 13:38:41 +07:00
Felix Lange 82f0bd9009 p2p/discover: code review fixes 2015-02-13 11:39:31 +01:00
Felix Lange 9915d3c3be p2p/discover: deflake UDP tests 2015-02-09 11:02:32 +01:00
Felix Lange 028775a086 cmd/ethereum, cmd/mist: add flag for discovery bootstrap nodes 2015-02-07 00:52:49 +01:00
Felix Lange 8564eb9f7e p2p/discover: add node URL functions, distinguish TCP/UDP ports 
The discovery RPC protocol does not yet distinguish TCP and UDP ports.
But it can't hurt to do so in our internal model.
 2015-02-07 00:12:23 +01:00
Felix Lange 739066ec56 p2p/discover: add some helper functions 2015-02-06 00:00:36 +01:00
Felix Lange 12224c7f59 p2p/discover: new package implementing the Node Discovery Protocol 2015-02-06 00:00:36 +01:00