366 lines
9.2 KiB
Smalltalk
366 lines
9.2 KiB
Smalltalk
"
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(C) 2010 by Holger Hans Peter Freyther
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All Rights Reserved
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"
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PackageLoader fileInPackage: 'OsmoNetwork'.
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Object subclass: SCCPConnection [
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| src dst queue conManager confirmSem proc state |
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SCCPConnection class >> stateInitial [ ^ 0 ]
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SCCPConnection class >> stateConnected [ ^ 1 ]
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SCCPConnection class >> stateReleased [ ^ 2 ]
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SCCPConnection class >> stateReleaseComplete [ ^ 3 ]
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SCCPConnection class >> stateTimeout [ ^ 3 ]
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SCCPConnection class >> new [
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^ super new
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initialize; yourself
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]
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initialize [
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state := SCCPConnection stateInitial.
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confirmSem := Semaphore new.
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queue := SharedQueue new.
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]
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conManager: aHandler [
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<category: 'private'>
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conManager := aHandler.
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]
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readQueue [
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<category: 'private'>
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^ queue
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]
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srcRef [
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<category: 'access'>
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^ src
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]
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srcRef: aRef [
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<category: 'access'>
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src := aRef
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]
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dstRef: aRef [
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<category: 'access'>
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dst := aRef
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]
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dstRef [
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<category: 'access'>
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^ dst
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]
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next [
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"Read the next item. If the connection is terminated"
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| msg |
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"If we are not connected we need to wait"
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state = SCCPConnection stateInitial
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ifTrue: [
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self waitForConfirmation.
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].
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"If we are not connected here. Send a EndOfStream signal"
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(state > SCCPConnection stateConnected and: [self readQueue isEmpty])
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ifTrue: [
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^ SystemExceptions.EndOfStream signal
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].
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msg := self readQueue next.
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"If this is a small integer our connection is gone"
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(msg isKindOf: SmallInteger)
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ifTrue: [
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^ SystemExceptions.EndOfStream signal
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].
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"We do have a real message"
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^ msg
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]
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nextPutData: aMsg [
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| dt1 |
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dt1 := Osmo.SCCPConnectionData initWith: self dstRef data: aMsg.
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self nextPut: dt1 toMessage.
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]
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nextPut: aMsg [
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conManager sendMsg: aMsg.
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]
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waitForConfirmation [
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"Wait for the connection to be confirmed and then exit"
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((Delay forSeconds: 10) timedWaitOn: confirmSem)
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ifTrue: [
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state := SCCPConnection stateTimeout.
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conManager connectionTimeout: self.
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^ false
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].
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^ true
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]
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"SCCP Connection state handling"
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terminate [
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self readQueue nextPut: 0.
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]
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confirm: aCC [
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<category: 'connection-handling'>
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self dstRef: aCC src.
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state := SCCPConnection stateConnected.
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confirmSem signal.
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]
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data: aDT [
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self readQueue nextPut: aDT data.
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]
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release [
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| rlsd |
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state := SCCPConnection stateReleased.
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rlsd := Osmo.SCCPConnectionReleased initWithDst: self dstRef src: self srcRef cause: 0.
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self nextPut: rlsd toMessage.
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]
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releaseComplete: aMSG [
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"TODO: verify that we are in the right state"
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state := SCCPConnection stateReleaseComplete.
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self terminate.
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]
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released: aRLSD [
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| rlc |
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"Give up local resources here. We are done."
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state := SCCPConnection stateReleaseComplete.
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rlc := Osmo.SCCPConnectionReleaseComplete
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initWithDst: aRLSD src src: aRLSD dst.
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self nextPut: rlc toMessage.
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self terminate.
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]
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state [ <category: 'accessing'> ^ state ]
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]
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Object subclass: MSGParser [
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<comment: 'I take a SCCP message and recursively parse all the data'>
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MSGParser class >> parse: aByteArray [
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| sccp |
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"Return a completely decoded subtree"
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sccp := Osmo.SCCPMessage decode: aByteArray.
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(sccp respondsTo: #data)
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ifTrue: [
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sccp data: (self decodeBSSAP: sccp data).
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].
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^ sccp
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]
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MSGParser class >> decodeBSSAP: aData [
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| bssap |
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bssap := BSSAPMessage decode: aData.
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bssap class msgType = BSSAPDTAP msgType
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ifTrue: [
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bssap data: (GSM48MSG decode: bssap data)
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]
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ifFalse: [
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bssap data: (self decodeBSSMAP: bssap data).
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].
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^ bssap
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]
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MSGParser class >> decodeBSSMAP: aData [
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| bssmap |
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bssmap := IEMessage decode: aData with: GSM0808IE.
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bssmap findIE: (GSMLayer3Info elementId) ifPresent: [:each |
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each data: (GSM48MSG decode: each data).
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].
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^ bssmap
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]
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]
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Object subclass: SCCPHandler [
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| connections last_ref connection |
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<comment: 'I handle SCCP messages'>
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registerOn: aDispatcher [
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aDispatcher addHandler: Osmo.IPAConstants protocolSCCP
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on: self with: #handleMsg:.
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]
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connectionTimeout: aConnection [
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('SCCP Connection ', aConnection srcRef asString, ' timeout.') printNl.
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self connections remove: aConnection.
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]
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forwardMessage: aMessage with: aConnection[
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(aMessage isKindOf: Osmo.SCCPConnectionConfirm)
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ifTrue: [
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aConnection confirm: aMessage.
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^ true
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].
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(aMessage isKindOf: Osmo.SCCPConnectionData)
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ifTrue: [
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aConnection data: aMessage.
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^ true
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].
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(aMessage isKindOf: Osmo.SCCPConnectionReleased)
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ifTrue: [
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aConnection released: aMessage.
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self connections remove: aConnection.
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^ true
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].
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(aMessage isKindOf: Osmo.SCCPConnectionReleaseComplete)
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ifTrue: [
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aConnection releaseComplete: aMessage.
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self connections remove: aConnection.
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^ true.
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].
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self logError: 'Unhandled SCCP packet %1' % {aMessage class} area: #sccp.
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"Message is not handled here"
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^ false
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]
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dispatchMessage: aMessage [
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self connections do: [:each |
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each srcRef = aMessage dst
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ifTrue: [
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^ self forwardMessage: aMessage with: each.
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].
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].
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'No one has handled the connection with ', aMessage dst asString printNl.
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]
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dissectMSG: aMsg [
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^ MSGParser parse: (aMsg asByteArray).
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]
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newConnection: aCon [
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"Interesting for subclasses"
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]
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confirmConnection: aMsg [
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| con res |
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con := SCCPConnection new.
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con srcRef: self assignSrcRef.
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con conManager: self.
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self connections add: con.
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"Confirm the messga now and send any data"
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con confirm: aMsg.
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aMsg data ifNotNil: [
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con data: aMsg.
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].
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"Confirm it without sending any new data bad"
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res := Osmo.SCCPConnectionConfirm initWithSrc: (con srcRef) dst: (con dstRef).
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self sendMsg: res toMessage.
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self newConnection: con.
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^ con.
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]
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handleMsg: aMsg [
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| sccp |
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[
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sccp := self dissectMSG: aMsg asByteArray.
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] on: Exception do: [
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self logError: 'Failed to parse message' area: #sccp.
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aMsg toMessageOrByteArray printNl.
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^ false
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].
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(sccp isKindOf: Osmo.SCCPConnectionRequest) ifTrue: [
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self logNotice: 'New incoming connection' area: #sccp.
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self confirmConnection: sccp.
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^ true
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].
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self dispatchMessage: sccp.
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]
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connection: aConnection [
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connection := aConnection.
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]
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sendMsg: aMsg [
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"Send a SCCP message."
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connection send: aMsg with: Osmo.IPAConstants protocolSCCP.
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]
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createConnection: aData [
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| con res|
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con := SCCPConnection new.
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con srcRef: self assignSrcRef.
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con conManager: self.
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res := Osmo.SCCPConnectionRequest
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initWith: (con srcRef) dest: (Osmo.SCCPAddress createWith: 254) data: aData.
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self connections add: con.
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self sendMsg: res toMessage.
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^ con
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]
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referenceIsFree: aRef [
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<category: 'private'>
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self connections do: [:each |
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each srcRef = aRef
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ifTrue: [
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^ false
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].
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].
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^ true
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]
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assignSrcRef [
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"Find a free SCCP reference"
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1 to: 16rFFFFFE do: [:dummy |
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| ref |
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ref := Random between: 1 and: 16rFFFFFE.
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(self referenceIsFree: ref)
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ifTrue: [
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^ ref.
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].
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].
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self error: 'No free SCCP Connection. Close some'.
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]
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connections [
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^ connections ifNil: [ connections := OrderedCollection new. ]
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]
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]
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