mirror of
https://github.com/go-i2p/go-i2p.git
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working on router info
This commit is contained in:
Hayden Parker
@ -1,14 +1,88 @@
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package common
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/*
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I2P RouterInfo
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https://geti2p.net/en/docs/spec/common-structures#struct_RouterInfo
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Accurate for version 0.9.24
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+----+----+----+----+----+----+----+----+
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| router_ident |
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+ +
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| |
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~ ~
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~ ~
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| |
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+----+----+----+----+----+----+----+----+
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| published |
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+----+----+----+----+----+----+----+----+
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|size| RouterAddress 0 |
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+----+ +
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| |
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~ ~
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~ ~
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| |
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+----+----+----+----+----+----+----+----+
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| RouterAddress 1 |
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+ +
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~ ~
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~ ~
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+----+----+----+----+----+----+----+----+
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| RouterAddress ($size-1) |
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+ +
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| |
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~ ~
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~ ~
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| |
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+----+----+----+----+-//-+----+----+----+
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|psiz| options |
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+----+----+----+----+-//-+----+----+----+
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| signature |
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+ +
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+ +
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+ +
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+ +
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+----+----+----+----+----+----+----+----+
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router_ident :: RouterIdentity
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length -> >= 387 bytes
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published :: Date
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length -> 8 bytes
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size :: Integer
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length -> 1 byte
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The number of RouterAddresses to follow, 0-255
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addresses :: [RouterAddress]
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length -> varies
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peer_size :: Integer
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length -> 1 byte
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The number of peer Hashes to follow, 0-255, unused, always zero
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value -> 0
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options :: Mapping
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signature :: Signature
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length -> 40 bytes
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*/
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import (
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"errors"
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log "github.com/Sirupsen/logrus"
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)
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type RouterInfo []byte
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//
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// Read a RouterIdentity from the RouterInfo, returning the
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// RouterIdentity and any parsing errors.
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// Read a RouterIdentity from the RouterInfo, returning the RouterIdentity and any errors
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// encountered parsing the RouterIdentity.
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//
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func (router_info RouterInfo) RouterIdentity() (router_identity RouterIdentity, err error) {
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router_identity, _, err = ReadRouterIdentity(router_info)
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@ -16,12 +90,17 @@ func (router_info RouterInfo) RouterIdentity() (router_identity RouterIdentity,
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}
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//
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// Return the Date the RouterInfo was published and any errors
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// encountered parsing the RouterInfo.
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// Return the Date the RouterInfo was published and any errors encountered parsing the RouterInfo.
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//
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func (router_info RouterInfo) Published() (date Date, err error) {
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_, remainder, _ := ReadRouterIdentity(router_info)
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if len(remainder) < 8 {
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remainder_len := len(remainder)
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if remainder_len < 8 {
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log.WithFields(log.Fields{
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"data_len": remainder_len,
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"required_len": 8,
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"reason": "not enough data",
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}).Error("error parsing router info")
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err = errors.New("error parsing date: not enough data")
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return
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}
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@ -30,12 +109,17 @@ func (router_info RouterInfo) Published() (date Date, err error) {
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}
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//
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// Return the Integer representing the number of RouterAddresses
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// are contained in this RouterInfo.
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// Return the Integer representing the number of RouterAddresses that are contained in this RouterInfo.
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//
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func (router_info RouterInfo) RouterAddressCount() (count int, err error) {
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_, remainder, _ := ReadRouterIdentity(router_info)
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if len(remainder) < 9 {
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remainder_len := len(remainder)
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if remainder_len < 9 {
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log.WithFields(log.Fields{
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"data_len": remainder_len,
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"required_len": 9,
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"reason": "not enough data",
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}).Error("error parsing router info")
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err = errors.New("error parsing router addresses: not enough data")
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return
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}
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@ -44,12 +128,18 @@ func (router_info RouterInfo) RouterAddressCount() (count int, err error) {
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}
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//
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// Read the RouterAddresses inside this RouterInfo and return
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// them in a slice.
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// Read the RouterAddresses inside this RouterInfo and return them in a slice, returning
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// a partial list if data is missing.
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//
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func (router_info RouterInfo) RouterAddresses() (router_addresses []RouterAddress, err error) {
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_, remainder, _ := ReadRouterIdentity(router_info)
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if len(remainder) < 9 {
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remainder_len := len(remainder)
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if remainder_len < 9 {
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log.WithFields(log.Fields{
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"data_len": remainder_len,
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"required_len": 9,
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"reason": "not enough data",
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}).Error("error parsing router info")
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err = errors.New("error parsing router addresses: not enough data")
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return
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}
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@ -81,42 +171,43 @@ func (router_info RouterInfo) PeerSize() int {
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//
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// Return the Options Mapping inside this RouterInfo.
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//
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func (router_info RouterInfo) Options() Mapping {
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func (router_info RouterInfo) Options() (mapping Mapping) {
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head := router_info.optionsLocation()
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size := head + router_info.optionsSize()
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return Mapping(router_info[head:size])
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mapping = Mapping(router_info[head:size])
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return
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}
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//
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// Return the 40 bytes that follow the Mapping in the RouterInfo.
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//
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func (router_info RouterInfo) Signature() Signature {
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func (router_info RouterInfo) Signature() (signature Signature) {
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head := router_info.optionsLocation()
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size := head + router_info.optionsSize()
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return Signature(router_info[head+size : head+size+40])
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signature = Signature(router_info[head+size : head+size+40])
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return
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}
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//
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// Used to determine where in the RouterInfo the Mapping
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// data begins for parsing.
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// Used during parsing to determine where in the RouterInfo the Mapping data begins.
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//
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func (router_info RouterInfo) optionsLocation() int {
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offset := 9
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func (router_info RouterInfo) optionsLocation() (location int) {
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location = 9
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var router_address RouterAddress
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remaining := router_info[9:]
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addr_count, _ := router_info.RouterAddressCount()
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for i := 0; i < addr_count; i++ {
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router_address, remaining, _ = ReadRouterAddress(remaining)
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offset += len(router_address)
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location += len(router_address)
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}
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return offset
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return
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}
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//
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// Used to determine the size of the options in the RouterInfo
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// for parsing.
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// Used during parsing to determine the size of the options in the RouterInfo.
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//
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func (router_info RouterInfo) optionsSize() int {
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func (router_info RouterInfo) optionsSize() (size int) {
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head := router_info.optionsLocation()
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return Integer(router_info[head:head+1]) + 1
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size = Integer(router_info[head:head+1]) + 1
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return
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}
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