RISCI_ATOM/cjdns: Mirror of CJDNS repository @ ab3a0f445231de0503f3736049333cbcc3314291

#Cjdns Admin API

Cjdns is inspected and configured through a UDP socket. When cjdroute starts up, it reads the configuration file and spawns cjdns core. The core knows nothing but the port which it should bind to and the private key which it should use. All other information such as peers, interfaces and passwords is given to the core through the admin UDP interface. When cjdroute is finished setting up the core, it exits leaving the core running in the background.

You can call all of the functions which are called by cjdroute to collect information and alter the core's configuration.

How a function works

To call a function you send a udp packet containing a bencoded request to the core and it sends back a bencoded response.

echo -n 'd1:q4:pinge' | nc6 -u -t 1 -n -w3 127.0.0.1 11234

If you are more comfortable writing json then benc, you can use benc2json in reverse mode to preprocess your message. Note: benc2json has been removed in 2821c81d49 to speed up the build.

echo '{ "q": "ping" }' | ./build/benc2json -r

Stream the request from json into benc and then make the request to the core:

echo '{ "q": "ping" }' \
    | ./build/benc2json -r \
    | tr -d '\n' \
    | nc6 -u -t 1 -n -w3 127.0.0.1 11234

Get the result back into json:

echo '{ "q": "ping" }' \
    | ./build/benc2json -r \
    | tr -d '\n' \
    | nc6 -u -t 1 -n -w3 127.0.0.1 11234 \
    | ./build/benc2json

Transaction ID

Because you can send multiple messages at once, you may add a transaction ID to a message and it will be reflected back to you in the response.

echo '{ "q": "ping", "txid": "my request" }' \
    | ./build/benc2json -r \
    | tr -d '\n' \
    | nc6 -u -t 1 -n -w3 127.0.0.1 11234 \
    | ./build/benc2json

Result:

{
  "txid" : "my request",
  "q" : "pong"
}

Arguments

Some functions require arguments and others allow arguments but assume defaults if they are not provided. Arguments are sent to a function through a benc dictionary called args.

The Admin_availableFunctions() function has an optional argument called page, this is because there are too many functions to be described in a single UDP packet. The following command will get the first page of functions from Admin_availableFunctions which will describe other functions and their required and allowed arguments.

echo -n '
{
    "q": "Admin_availableFunctions",
    "args": {
        "page": 0
    }
}' | ./build/benc2json -r \
    | tr -d '\n' \
    | nc6 -u -t 1 -n -w3 127.0.0.1 11234 \
    | ./build/benc2json

Authentication

Any function which changes the state of cjdns core requires authentication to carry out. Authentication is done on a per-request basis. Functions which don't require authentication can still be called with authentication and will still fail if the authentication is incorrect.

Step 1: Request a cookie from the server.
Step 2: Calculate the SHA-256 of the cookie and your admin password, place this hash and cookie in the request.
Step 3: Calculate the SHA-256 of the entire request with the hash and cookie added, replace the hash in the request with this result.

Steps 1 and 2 securely bind the cookie to the password so that the password hash cannot be taken and used again in another request later on, step 3 binds the cookie and password to the request so that a man-in-the-middle cannot change the content of the request in flight.

Anatomy of an authenticated request

A plain request such as {"q": "ping"} becomes {"q":"auth", "aq":"ping", "hash":<calculated hash>}. The q field is moved to aq (authenticated query) and the q field says auth.

NOTE: A cookie is only valid for 10 seconds so requesting and using a cookie must be done in the same script.

NOTE2: Cookies are reusable for now this is not part of the API and is considered a bug, you should always request a new cookie for each authenticated request otherwise you may be broke by changes in the future.

By example

Step 1: Get the cookie

RESP=`echo -n 'd1:q6:cookiee' | nc6 -u -t 1 -n -w3 127.0.0.1 11234` \
echo response=${RESP}; \
COOKIE=`echo ${RESP} | sed 's/d6:cookie10:\([0-9]*\)e/\1/'` \
echo cookie=${COOKIE};

Step 2: Calculate the hash of the cookie and password: For this step, you will need the admin password from your cjdroute.conf file, it's to be found inside of the block which says "admin": {.

ADMIN_PASS=you_will_find_this_in_your_cjdroute_dot_conf \
REQUEST='{"q": "auth", "aq": "ping", "hash": "__HASH__", "cookie": "__COOKIE__"}' \
COOKIE_RESP=`echo -n 'd1:q6:cookiee' | nc6 -u -t 1 -n -w3 127.0.0.1 11234` \
COOKIE=`echo ${COOKIE_RESP} | sed 's/d6:cookie10:\([0-9]*\)e/\1/'` \
HASH_ONE=`echo -n "${ADMIN_PASS}${COOKIE}" | sha256sum -b | cut -d\  -f1` ; \
REQ_ONE=`echo $REQUEST | sed -e "s/__HASH__/${HASH_ONE}/" -e "s/__COOKIE__/${COOKIE}/" \
        | ./build/benc2json -r | tr -d '\n'` ; \
echo "hash of password and cookie is ${HASH_ONE}" ; \
echo "Request with cookie and hash added:" ; \
echo "${REQ_ONE}" ; \
echo "JSON version of request:" ; \
echo "${REQ_ONE}" | ./build/benc2json

Step 3: Calculate the SHA-256 of the entire request and replace the one in the request: This will calculate the final request and send it to cjdns.

ADMIN_PASS=you_will_find_this_in_your_cjdroute_dot_conf \
REQUEST='{"q": "auth", "aq": "ping", "hash": "__HASH__", "cookie": "__COOKIE__"}' \
COOKIE_RESP=`echo -n 'd1:q6:cookiee' | nc6 -u -t 1 -n -w3 127.0.0.1 11234` \
COOKIE=`echo ${COOKIE_RESP} | sed 's/d6:cookie10:\([0-9]*\)e/\1/'` \
HASH_ONE=`echo -n "${ADMIN_PASS}${COOKIE}" | sha256sum -b | cut -d\  -f1` \
REQ_ONE=`echo $REQUEST | sed -e "s/__HASH__/${HASH_ONE}/" -e "s/__COOKIE__/${COOKIE}/" \
    | ./build/benc2json -r | tr -d '\n'` \
FINAL_HASH=`echo -n "$REQ_ONE" | sha256sum -b | cut -d\  -f1` \
FINAL_REQ=`echo $REQ_ONE | sed -e "s/${HASH_ONE}/${FINAL_HASH}/"` ; \
echo -n "$FINAL_REQ" \
    | nc6 -u -t 1 -n -w3 127.0.0.1 11234 \
    | ./build/benc2json

If you see this:

{
  "q" : "pong"
}

then it has succeeded, if the password is incorrect, you will see this:

{
  "error" : "Auth failed."
}

Tools:

Obviously using bash to craft cjdns admin RPC calls is probably the most awkward way possible, there are tools in cjdns/contrib which will help you craft requests, specifically there are libraries written in python and perl which will allow users to call cjdns internal functions as python/perl native functions. A tool called cexec is provided with the python library which allows you to call cjdns functions from shell scripts or the command line as follows:

./contrib/python/cexec 'ping()'

Cjdns Functions:

user@ubnta8:~/wrk/cjdns$ ./contrib/python/cexec 'functions()' | sort
Admin_asyncEnabled()
Admin_availableFunctions(page='')
Allocator_bytesAllocated()
Allocator_snapshot(includeAllocations='')
AuthorizedPasswords_add(password, user, authType='', ipv6=0)
AuthorizedPasswords_list()
AuthorizedPasswords_remove(user)
Core_exit()
Core_initTunnel(desiredTunName=0)
Core_pid()
ETHInterface_beacon(interfaceNumber='', state='')
ETHInterface_beginConnection(publicKey, macAddress, interfaceNumber='', password=0)
ETHInterface_new(bindDevice)
InterfaceController_disconnectPeer(pubkey)
InterfaceController_peerStats(page='')
IpTunnel_allowConnection(publicKeyOfAuthorizedNode, ip6Address=0, ip4Address=0)
IpTunnel_connectTo(publicKeyOfNodeToConnectTo)
IpTunnel_listConnections()
IpTunnel_removeConnection(connection)
IpTunnel_showConnection(connection)
memory()
NodeStore_dumpTable(page)
NodeStore_getLink(parent, linkNum)
NodeStore_getRouteLabel(pathParentToChild, pathToParent)
NodeStore_nodeForAddr(ip=0)
ping()
RainflyClient_addKey(ident)
RainflyClient_addServer(addr)
RainflyClient_minSignatures(count)
RouterModule_findNode(nodeToQuery, target, timeout='')
RouterModule_getPeers(path, nearbyPath=0, timeout='')
RouterModule_lookup(address)
RouterModule_pingNode(path, timeout='')
SearchRunner_showActiveSearch(number)
Security_checkPermissions()
Security_dropPermissions()
Security_setUser(user)
SessionManager_getHandles(page='')
SessionManager_sessionStats(handle)
SwitchPinger_ping(path, data=0, keyPing='', timeout='')
UDPInterface_beginConnection(publicKey, address, interfaceNumber='', password=0)
UDPInterface_new(bindAddress=0)

###RouterModule_pingNode()

Auth Required

Send a node a cjdns ping request.

Parameters:

required String path may be a route such as "0000.0000.0000.1d53" or an ip address such as "fc5d:baa5:61fc:6ffd:9554:67f0:e290:7536", or an ip with explicit path eg: "fc5d:baa5:61fc:6ffd:9554:67f0:e290:7536@0000.0000.0000.1d53"
Int timeout (optional) the number of milliseconds after which to timeout the ping if there is no response. Defaults to router's adaptive ping timeout if unspecified.

Responses:

error: could not find node to ping if there was no node by the given address found in the routing table
result: timeout gives timeout and number of milliseconds since the ping.
result: pong gives version representing the git hash of the source code which built the pinged node, and ms which is the number of milliseconds since the original ping.

Examples:

>>> cjdns.RouterModule_pingNode('fc38:4c2c:1a8f:3981:f2e7:c2b9:6870:6e84')
{'version': '5c5e84ccdba3f31f7c88077729700b4368320bc2', 'result': 'pong', 'ms': 79}

>>> cjdns.RouterModule_pingNode('fc5d:baa5:61fc:6ffd:9554:67f0:e290:7536')
{'error': 'could not find node to ping'}

>>> cjdns.RouterModule_pingNode('0000.0000.0000.0013')
{'version': '2b62b9ae911f1044e45f3f28fdd63d0d5a7fc512', 'result': 'pong', 'ms': 0}

>>> cjdns.RouterModule_pingNode('a')
{'error': "Unexpected length, must be either 39 char ipv6 address (with leading zeros)
eg: 'fc4f:000d:e499:8f5b:c49f:6e6b:01ae:3120' or 19 char path eg: '0123.4567.89ab.cdef'"}

>>> cjdns.RouterModule_pingNode('aaaaaaaaaaaaaaaaaaa')
{'error': 'parse path failed'}

>>> cjdns.RouterModule_pingNode('aaaaaaaaaaaaaaaaaaazzzzzzzzzzzzzzzzzzzz')
{'error': 'parsing address failed'}

>>> cjdns.RouterModule_pingNode('fc38:4c2c:1a8f:3981:f2e7:c2b9:6870:6e84', 10)
{'result': 'timeout', 'ms': 10}

ETHInterface Functions:

ETHInterface is a connector which allows cjdns nodes on the same lan to automatically connect without the need to IP addresses on the LAN or sharing of connection credentials. It works on wireless LANs as well as wired ethernet LANs.

ETHInterface_new()

Create a new ETHInterface and bind it to a device. NOTE: this call will always fail with 'error': 'call to socket() failed. [permission denied]' unless it is running as root and will fail with process cannot open more files if Security_setUser() has already been called.

Auth Required

Parameters:

required String bindDevice the name of the ethernet device to bind to, eg: eth0 or wlan0.

Returns:

Int interfaceNumber an number which can be used to carry out other operations on the interface later.

ETHInterface_beginConnection()

Connect an ETHInterface to another computer which has an ETHInterface running.

Auth Required

Parameters:

required String publicKey The public key of the other node, similar to UDPInterface_beginConnection()
required String macAddress The mac address of the other node.
Int interfaceNumber The interface number to use, assumed 0 (first ETHinterface created) if not supplied.
String password A password for connecting to the other node if required.

Returns:

String error: none if everything went well.

Other errors are self-explanitory.

ETHInterface_beacon()

Enable or disable sending or receiving of ETHInterface beacon messages. ETHInterface uses periodic beacon messages to automatically peer nodes which are on the same LAN. Be mindful that if your lan has is open wifi, enabling beaconing will allow anyone to peer with you.

Auth Required

Beacon States:

Disabled, no beacons are sent and incoming beacon messages are discarded.
Accepting, no beacons are sent but if an incoming beacon is received, it is acted upon.
Sending and Accepting, beacons are sent and accepted.

Parameters:

Int interfaceNumber The number of the ETHInterface to change the state of, assumed 0 if not provided.
Int state What state to switch to, if not provided, the current state will be queried only.

Returns:

String error: none if all went well.
Int state: the state number after the call is complete.
String stateName: a description of the state.

Example:

$ ./contrib/python/cexec 'ETHInterface_beacon(2)'
{'txid': 'FYRKHAPIM3', 'error': 'invalid interfaceNumber'}

$ ./contrib/python/cexec 'ETHInterface_beacon(0)'
{'txid': 'Z7KHE7SZ5R', 'state': 2, 'stateName': 'sending and accepting', 'error': 'none'}

$ ./contrib/python/cexec 'ETHInterface_beacon(0, 0)'
{'txid': 'TP1R8PYCNS', 'state': 0, 'stateName': 'disabled', 'error': 'none'}

$ ./contrib/python/cexec 'ETHInterface_beacon(0, 1)'
{'txid': 'UGKKGX4ZC9', 'state': 1, 'stateName': 'accepting', 'error': 'none'}

$ ./contrib/python/cexec 'ETHInterface_beacon(0, 2)'
{'txid': '1B7RXJEH3N', 'state': 2, 'stateName': 'sending and accepting', 'error': 'none'}

IpTunnel Functions

IPTunnel is designed to allow tunneling of IPv4 and IPv6 packets through a cjdns network to the external internet or to a virtual LAN. It provides familiar VPN type functionality. There are 2 nodes, a client and a server, the server uses IPTunnel_allowConnection() and the client uses IPTunnel_connectTo() the server assigns IPv4 and/or IPv6 addresses to the client and the client is required to use only these addresses, subnet assignment is not supported. When the client uses IPTunnel_connectTo(), it sends a request to the server for addresses and continues polling the server periodically until the addresses are provided.

IpTunnel_listConnections()

List the connection numbers of all IPTunnel connections.

Auth Required

Returns:

List connections: A list of integers representing the connection numbers for each connection.
String error: none

Example:

$ ./contrib/python/cexec 'IpTunnel_listConnections()'
{'connections': [0], 'txid': '5ZFPFJ60AT', 'error': 'none'}

IpTunnel_showConnection()

Show information about a perticular IPTunnel connection.

Auth Required

Parameters:

required Int connection: the connection number for the connection to show information about.

Returns:

Int outgoing: 1 if the connection is outgoing, 0 if it's incoming.
String key: the cjdns public key of the foreign node.
String ip6Address: the IPv6 address which is assigned to this IPTunnel if applicable.
Int ip6Prefix: the IPv6 netmask/prefix length which is assigned to this IPTunnel if applicable.
String ip4Address: the IPv4 address which is assigned to this IPTunnel if applicable.
Int ip4Prefix: the IPv4 netmask/prefix length which is assigned to this IPTunnel if applicable.
String error: none unless the connection number is invalid.

Examples:

# Prior to getting it's addresses from the server, they are not listed.
$ ./contrib/python/cexec 'IpTunnel_showConnection(0)'
{'outgoing': 1, 'txid': 'REIV40SXD9', 'key': 'd5d0wu0usrkufd8s98t19gt7m2ggvbz1xbnuxu82x63uqlnk2kb0.k', 'error': 'none'}

# After a short wait, the addresses are provided and they are now listed.
$ ./contrib/python/cexec 'IpTunnel_showConnection(0)'
{'outgoing': 1, 'txid': 'CAQCTWECRD', 'ip4Address': '192.168.10.2', 'key': 'd5d0wu0usrkufd8s98t19gt7m2ggvbz1xbnuxu82x63uqlnk2kb0.k', 'error': 'none', 'ip6Address': '2a02:2498:e000:20::144:3'}

IpTunnel_removeConnection()

Remove an IPTunnel connection from the list, the other end will nolonger be able to send traffic over this connection.

Auth Required

NOT IMPLEMENTED

IpTunnel_connectTo()

Initiate an outgoing connection to another node and request IP addresses from them.

Auth Required

Parameters:

required String publicKeyOfNodeToConnectTo the pubkey of the node to connect to.

Returns:

String error: none if all went well
Int connection: the connection number of the new connection

Examples:

$ ./contrib/python/cexec 'IpTunnel_connectTo("d5d0wu0usrkufd8s98t19gt7m2ggvbz1xbnuxu82x63uqlnk2kb0.k")'
{'connection': 1, 'txid': '9QXRQO1FG8', 'error': 'none'}

IpTunnel_allowConnection()

Allow in incoming connection from another node, they must also use IPTunnel_connectTo() in order to complete the connection.

Auth Required

Parameters:

required String publicKeyOfAuthorizedNode The key of the node which is authorized to connect.
String ip6Address The IPv6 address to give them if applicable.
String ip4Address The IPv4 address to give them if applicable.

Returns:

String error none if all went well.
Int connection the connection number for the new connection.

UDPInterface Functions

UDPInterface is the basic cjdns interface which is used to link distant nodes over the internet. It will work on a LAN as long as the nodes have IP addresses but for linking on a LAN, ETHInterface is easier.

UDPInterface_new()

Create a new UDPInterface which is either bound to an address/port or not.

NOTE: This call will fail with 'error': 'call to socket() failed [process cannot open more files]' is Security_noFiles() has already been called.

Parameters:

String bindAddress: the address/port to bind to, if unspecified, it is assumed to be 0.0.0.0.

Returns:

String error none if all went well
Int interfaceNumber the number of the interface, usable with UDPInterface_beginConnection()

UDPInterface_beginConnection()

Start a direct connection to another node.

Auth Required

Parameters:

required String publicKey the base32 public key for the node to connect to, ending in .k.
required String address the ip address and port for the node, at this time DNS resolution and IPv6 is not supported.
Int interfaceNumber the number for the UDPInterface to use for connecting, provided by UDPInterface_new() if not sent, 0 is assumed.
String password a password to use when connecting.

Note: just because it returns 'error': 'none' does not mean that the connection was successful. The neighbor may still reject our connection attempts.

Example:

>>> cjdns.UDPInterface_beginConnection("v0zyvrjuc4xbzh4n9c4k3qpx7kg8xgndv2k45j9nfgb373m8sss0.k", "192.168.0.2:10000", "null")
{'error': 'none'}

>>> cjdns.UDPInterface_beginConnection("v0zyvrjuc4xbzh4n9c4k3qpx7kg8xgndv2k45j9nfgb373m8sss0.k", "x", "null")
{'error': 'unable to parse ip address and port.'}

>>> cjdns.UDPInterface_beginConnection("k", "x", "null")
{'error': 'publicKey is too short, must be 52 characters long.'}

>>> cjdns.UDPInterface_beginConnection("------------------------------------------------------", "x", "null")
{'error': 'failed to parse publicKey.'}

>>> cjdns.UDPInterface_beginConnection("zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz0.k", "192.168.0.2:10000", "null")
{'error': 'invalid cjdns public key.'}

>>> cjdns.UDPInterface_beginConnection("v0zyvrjuc4xbzh4n9c4k3qpx7kg8xgndv2k45j9nfgb373m8sss0.k", "[1234::5]:10000", "null")
{'error': 'different address type than this socket is bound to.'}

AdminLog Functions:

Since cjdns contains so many logging locations, logging to a file would not only be inefficient but it would fill up your disk rather quickly. Because if this, cjdns logging is only enabled on request, with these functions you can ask for logs to be enabled on a log level, per-file or even per-line basis.

Log levels may be excluded at compile time in which case they will not be available. Each log level implies inclusion of every higher level, if you subscribe to INFO logging, you will also automatically get WARN, ERROR, and CRITICAL.

Cjdns log levels:

KEYS Not compiled in by default, contains private keys and other secret information.
DEBUG Default level, contains lots of information which is probably not useful unless you are diagnosing an ongoing problem.
INFO Shows starting and stopping of various components and general purpose information.
WARN Generally this means some system has undergone a minor failure, this includes failures due to network disturbance.
ERROR This means there was a (possibly temporary) failure of a system within cjdns.
CRITICAL This means something is broken such that the cjdns core will likely have to exit immedietly.

To see an implementation of cjdns log consumer, look at contrib/python/cjdnslog.

AdminLog_subscribe()

Subscribe to logging of a level/file/line.

Auth Required

NOTE: Because this function responds asynchronously, using netcat or cexec to call it will not work, additionally it will stop sending asynchronous messages unless an incoming message comes in every 10 seconds so you must send periodic messages on the same UDP port. See: Admin_asyncEnabled() for more information.

Parameters:

Int line: If specified, the logging will be constrained to the log message which appers on the given line number in the source file.
String file: If specified, the logging will be constrained to the named file, names are not fully qualified, use "CryptoAuth.c", not "/path/to/CryptoAuth.c".
String level: If specified, the logging will be constrained to log lines which are of the given level or higher.

Returns:

String error: none if all goes well.
String streamId: an opaque string which will be contained in each log message.

Log message structure:

String file the name of the file where the log message came from, eg: "CryptoAuth.c".
String level the log level, one of ["KEYS", "DEBUG", "INFO", "WARN", "ERROR", "CRITICAL"]
Int line the line number of the line where the log function was called.
String message the log message
String streamId the streamId for the logging subscription.
Int time the time in seconds since the unix epoch when the log message was created.
String txid the same transaction which was used in the call to AdminLog_subscribe().

AdminLog_unsubscribe()

Unsubscribe from logging.

Auth Required

Parameters:

required String streamId: The id returned in the call to AdminLog_subscribe().

Returns:

String error: none if the subscription existed and was removed.

Note: If the subscription has already timed out, removing it will yield 'error': 'No such subscription.'.

Example:

$ ./contrib/python/cexec 'AdminLog_subscribe()'
{'txid': '0EKWEP7VXI', 'streamId': 'f1a0e225183397f4', 'error': 'none'}

$ ./contrib/python/cexec 'AdminLog_unsubscribe("f1a0e225183397f4")'
{'txid': 'CB4V7KLYCC', 'error': 'none'}

Admin Functions

These functions are for dealing with the Admin interface, the infrastructure which allows all of the other functions throughout cjdns to be accessed from the admin socket.

Admin_availableFunctions()

Get a list of functions which are available to the admin socket as well as their required and optional parameters, unfortunately their return values are not provided and can only be determined by experimentation or by reading the source.

Note: The list of functions is paged to make sure each message fits inside of a UDP packet, in order to get the whole list of functions, you must increment the page parameter until the result nolonger contains the more field.

Parameters:

Int page: the page of functions to request, if unspecified it will be assumed to be 0.

Returns:

Dict availableFunctions: a map of function descriptions by function name.
Int more: only present if there are more pages.

Function Description:

Each function description is a Dict of function parameters with the parameter name as the key and the specifications as the value. The specification required is an Int which is either 0 meaning the parameter is optional or 1 meaning it is required. type is a String which is one of ["Int", "String", "Dict", "List"] and defines the type which the parameter must be.

'AdminLog_subscribe': {
    'line': {
        'required': 0,
        'type': 'Int'
    },
    'file': {
        'required': 0,
        'type': 'String'
    },
    'level': {
        'required': 0,
        'type': 'String'
    }
}

Admin_asyncEnabled()

This function is for determining whether asynchronous communication is allowed. Asynchronous communication, EG: AdminLog responses, is only allowed with clients which satisfy certain requirements.

They must send an authenticated request, in the case of AdminLog this is no worry because AdminLog_subscribe() requires authentication.
They must have sent something in the past 10 seconds, because of the statelessness of UDP, there is no way to tell a client which is listening quietly from one which has wandered off so in order to remain enabled, it must periodically ping (or periodically call Admin_asyncEnabled()). These calls do not need to be authenticated, there just needs to have been one in history.

Returns:

Int asyncEnabled: 1 if asynchronous communication is allowed for this session, 0 otherwise.

Example: This example illustrates how using cexec to call it returns true because cexec uses authenticated calls whereas manually calling it without authentication returns false.

$ ./contrib/python/cexec 'Admin_asyncEnabled()'
{'asyncEnabled': 1, 'txid': '74GF0SS2N0'}

echo '{ "q": "Admin_asyncEnabled" }' \
    | ./build/benc2json -r \
    | tr -d '\n' \
    | nc -u 127.0.0.1 11234 \
    | ./build/benc2json

{
  "asyncEnabled" : 0
}

Security Functions

These functions are available for putting the cjdns core into a sandbox where a security breach within the core would be less likely to cause a total system compromize.

Security_setUser()

Set the user ID which cjdns is running under to a different user. This function allows cjdns to shed privileges after starting up.

NOTE: This function will always fail with an error about process cannot open more files if Security_noFiles() has already been called.

Parameters:

required String user: the name of the user to change to.

Return:

String error: none if all went well, otherwise a description of the failure.

Security_noFiles()

Set the hard open file limit to zero, while this does not force closed file descriptors which are already open, it makes any function requiring the opening of a file to fail providing a powerful sandbox. By calling this function after cjdns is started, one can insure that cjdns core cannot touch the filesystem or open network sockets which it does not already have open. This will however prevent a number of other admin API functions fron working.

Returns:

String error: none

Examples:

$ ./contrib/python/cexec 'UDPInterface_new("[::]:2048")'
{'interfaceNumber': 3, 'txid': 'NQGOZXJZIC', 'error': 'none'}

$ ./contrib/python/cexec 'Security_noFiles()'
{'txid': 'CQYQWA5SZY', 'error': 'none'}

$ ./contrib/python/cexec 'UDPInterface_new("[::]:5000")'
{'txid': 'UZH9LIUOG0', 'cause': 'process cannot open more files', 'error': 'call to socket() failed [process cannot open more files]'}

Core_initTunnel()

This function is used during cjdns startup to initialize the TUN device, set it's IP address and set the MTU, it is hastily designed and may be removed in the future.

Parameters:

String desiredTunName: the name of the TUN device to use, if unspecified it will ask the kernel for a new device.

Returns:

String error: none if all went well, otherwise the error which occured.

Note: an error will be returned if anything goes wrong initializing the tunnel, setting it's IP address or setting it's MTU, even if there is an error, the tunnel may work just fine and even if the tunnel doesn't work, cjdns will function as a router only without the TUN device.

Core_exit()

A function to stop cjdns.

Returns:

String error: none before exiting.

ping()

Returns:

{'q':'pong'}

For checking if the admin connection is functioning.

RouterModule_lookup()

Auth Required

Parameters:

String address a 39 character (zero padded) ipv6 address.

Returns:

A route if one is found in the routing table.
An address and route of the node which should be handed the packet, if a route is not found in the local table.
An error if the address is not parsable.

Examples:

>>> print cjdns.RouterModule_lookup('fc5d:baa5:61fc:6ffd:9554:67f0:e290:7535')
{'result': '0000.0000.0000.1953', 'error': 'none'}

>>> print cjdns.RouterModule_lookup('fc5d:baa5:61fc:6ffd:9554:67f0:e290:7536')
{'result': 'fcf1:a7a8:8ec0:589b:c64c:cc95:1ced:3679@0000.0000.0000.0013', 'error': 'none'}

>>> print cjdns.RouterModule_lookup('f')
{'result': '', 'error': 'address wrong length'}

>>> print cjdns.RouterModule_lookup('zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz')
{'result': '', 'error': 'failed to parse address'}

AuthorizedPasswords_add()

Auth Required

Parameters:

String password a password which will allow neighbors to make direct connections.
String user a friendly string to identify this password.
Int authType (optional) the method for authenticating, defaults to 1 (only currently supported method).

Returns:

error:none if everything went well.
error:Specified auth type is not supported. if the auth type is specified and not 1.
error:Password already added. if you try to add the same user or password twice.
error:Out of memory to store password. if the buffer for storing authorized passwords is full.

Examples:

$ ./contrib/python/cexec 'AuthorizedPasswords_add(user="test",password="yh14wl2ffgcqq6bvut12xrz7g3")'
{'error': 'none'}

$ ./contrib/python/cexec 'AuthorizedPasswords_add(user="test2",password="2yh14wl2ffgcqq6bvut12xrz7g3",authType=300)'
{'error': 'Specified auth type is not supported.'}

$ ./contrib/python/cexec 'AuthorizedPasswords_add(user="test",password="yh14wl2ffgcqq6bvut12xrz7g3")'
{'error': 'Password already added.'}

AuthorizedPasswords_list()

Auth Required

Get a list of all the authorized users.

Example:

$ ./contrib/python/cexec 'AuthorizedPasswords_list()'
{'total': 2, 'users': ['Test User1', 'Local Peers'], 'txid': 'W0DUG0D50K'}

memory()

Get the number of bytes of memory allocated by all memory allocators in the router.

Example:

>>> cjdns.memory()
{'bytes': 779259}

NodeStore_dumpTable()

Parameters:

Int page the page of the routing table to dump, allowing you to get the whole table in a series of reasonably small requests.

Response:

routingTable a key which contains a list of dictionaries, each containing ip, link and path. ip is the IPv6 address of the node, link is a unitless number between 0 inclusive and 2^32 exclusive, representing the router's opinion of the quality of that path, higher is better. path is the route to the node.
more to signal that there is another page of results, the engine will add a more key with the integer 1, if there isn't another page of results, the more key will not be added.

What the data looks like:

{
    'routingTable': [
        {
            'ip': 'fce5:de17:cbde:c87b:5289:0556:8b83:c9c8',
            'link': 4294967295,
            'path': '0000.0000.0000.0001'
        }, {
            'ip': 'fcfc:2ebe:346c:7fe7:95af:a58b:2631:dead',
            'link': 235149061,
            'path': '0000.0000.631a.3b53'
        }, {
            'ip': 'fc70:772a:f803:7c4e:38bd:981b:f791:60a1',
            'link': 271119350,
            'path': '0000.0000.017b.b333'
        },
        ..............................
    ],
    'more': 1
}

Example:

>>> cjdns.NodeStore_dumpTable(0)
{'routingTable': [{'ip': 'fce5:de17:cbde:c87b:5289:0556:8b83:c9c8', 'link': 4294967295,....

>>> cjdns.NodeStore_dumpTable(4)
{'routingTable': []}

SwitchPinger_ping()

Auth Required

Send a switch level ping. There is no routing table lookup and the router is not involved. Pinging IP addresses this way is not possible.

Parameters: SwitchPinger_ping(required String path, String data, Int timeout)

String path the route to the node to ping eg: 0000.0000.04f5.2555
String data (optional) for diagnosing data-dependent errors.
Int timeout (optional) milliseconds to wait for a response. If unspecified, will default to DEFAULT_TIMEOUT as defined in SwitchPinger_admin.c (2 seconds).

Examples:

>>> cjdns.SwitchPinger_ping('0000.0000.04f5.2555')
{'path': '0000.0000.04f5.2555', 'data': '', 'result': 'pong', 'ms': 281}

>>> cjdns.SwitchPinger_ping('fca5:9fe0:3fa2:d576:71e6:8373:7aeb:ea11')
{'error': 'path was not parsable.'}

>>> cjdns.SwitchPinger_ping('0000.0000.04f5.2555', '12345abcdefg')
{'path': '0000.0000.04f5.2555', 'data': '12345abcdefg', 'result': 'pong', 'ms': 326}

>>> cjdns.SwitchPinger_ping('0000.0000.0405.2555')
{'path': '0000.0000.0405.2555', 'data': '', 'result': 'ping message caused switch error', 'ms': 278}

>>> cjdns.SwitchPinger_ping('0000.0000.04f5.2555', '', 30)
{'result': 'timeout', 'ms': 77}

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How a function works

Transaction ID

Arguments

Authentication

Anatomy of an authenticated request

By example

Tools:

Cjdns Functions:

ETHInterface Functions:

ETHInterface_new()

ETHInterface_beginConnection()

ETHInterface_beacon()

IpTunnel Functions

IpTunnel_listConnections()

IpTunnel_showConnection()

IpTunnel_removeConnection()

IpTunnel_connectTo()

IpTunnel_allowConnection()

UDPInterface Functions

UDPInterface_new()

UDPInterface_beginConnection()

AdminLog Functions:

AdminLog_subscribe()

AdminLog_unsubscribe()

Admin Functions

Admin_availableFunctions()

Function Description:

Admin_asyncEnabled()

Security Functions

Security_setUser()

Security_noFiles()

Core_initTunnel()

Core_exit()

ping()

RouterModule_lookup()

AuthorizedPasswords_add()

AuthorizedPasswords_list()

memory()

NodeStore_dumpTable()

SwitchPinger_ping()

admin-api.md 33 KB

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