587 lines
16 KiB
C++
587 lines
16 KiB
C++
/**
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* engine.cpp
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* Yet Another SIP Stack
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* This file is part of the YATE Project http://YATE.null.ro
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*
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* Yet Another Telephony Engine - a fully featured software PBX and IVR
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* Copyright (C) 2004, 2005 Null Team
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*
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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 General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <yatesip.h>
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#include <yateversn.h>
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#include "util.h"
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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using namespace TelEngine;
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static TokenDict sip_responses[] = {
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{ "Trying", 100 },
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{ "Ringing", 180 },
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{ "Call Is Being Forwarded", 181 },
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{ "Queued", 182 },
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{ "Session Progress", 183 },
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{ "OK", 200 },
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{ "Accepted", 202 },
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{ "Multiple Choices", 300 },
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{ "Moved Permanently", 301 },
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{ "Moved Temporarily", 302 },
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{ "Use Proxy", 305 },
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{ "Alternative Service", 380 },
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{ "Bad Request", 400 },
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{ "Unauthorized", 401 },
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{ "Payment Required", 402 },
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{ "Forbidden", 403 },
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{ "Not Found", 404 },
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{ "Method Not Allowed", 405 },
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{ "Not Acceptable", 406 },
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{ "Proxy Authentication Required", 407 },
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{ "Request Timeout", 408 },
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{ "Gone", 410 },
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{ "Request Entity Too Large", 413 },
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{ "Request-URI Too Long", 414 },
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{ "Unsupported Media Type", 415 },
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{ "Unsupported URI Scheme", 416 },
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{ "Bad Extension", 420 },
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{ "Extension Required", 421 },
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{ "Session Timer Too Small", 422 },
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{ "Interval Too Brief", 423 },
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{ "Temporarily Unavailable", 480 },
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{ "Call/Transaction Does Not Exist", 481 },
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{ "Loop Detected", 482 },
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{ "Too Many Hops", 483 },
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{ "Address Incomplete", 484 },
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{ "Ambiguous", 485 },
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{ "Busy Here", 486 },
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{ "Request Terminated", 487 },
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{ "Not Acceptable Here", 488 },
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{ "Bad Event", 489 },
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{ "Request Pending", 491 },
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{ "Undecipherable", 493 },
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{ "Security Agreement Required", 494 },
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{ "Server Internal Error", 500 },
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{ "Not Implemented", 501 },
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{ "Bad Gateway", 502 },
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{ "Service Unavailable", 503 },
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{ "Server Time-out", 504 },
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{ "Version Not Supported", 505 },
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{ "Message Too Large", 513 },
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{ "Response Cannot Be Sent Safely", 514 },
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{ "Response requires congestion management", 515 },
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{ "Proxying of request would induce fragmentation", 516 },
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{ "Precondition Failure", 580 },
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{ "Busy Everywhere", 600 },
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{ "Decline", 603 },
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{ "Does Not Exist Anywhere", 604 },
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{ "Not Acceptable", 606 },
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{ 0, 0 },
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};
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TokenDict* TelEngine::SIPResponses = sip_responses;
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URI::URI()
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: m_parsed(false)
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{
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}
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URI::URI(const String& uri)
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: String(uri), m_parsed(false)
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{
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}
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URI::URI(const URI& uri)
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: String(uri), m_parsed(false)
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{
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m_desc = uri.getDescription();
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m_proto = uri.getProtocol();
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m_user = uri.getUser();
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m_host = uri.getHost();
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m_port = uri.getPort();
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m_parsed = true;
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}
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URI::URI(const char* proto, const char* user, const char* host, int port, const char* desc)
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: m_desc(desc), m_proto(proto), m_user(user), m_host(host), m_port(port)
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{
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if (desc)
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*this << "\"" << m_desc << "\" <";
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*this << m_proto << ":";
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if (user)
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*this << m_user << "@";
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*this << m_host;
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if (m_port > 0)
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*this << ":" << m_port;
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if (desc)
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*this << ">";
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m_parsed = true;
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}
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void URI::changed()
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{
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m_parsed = false;
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}
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void URI::parse() const
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{
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if (m_parsed)
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return;
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DDebug("URI",DebugAll,"parsing '%s' [%p]",c_str(),this);
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m_port = 0;
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m_desc.clear();
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// the compiler generates wrong code so use the temporary
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String tmp(*this);
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bool hasDesc = false;
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Regexp r("^[[:space:]]*\"\\([^\"]\\+\\)\"[[:space:]]*\\(.*\\)$");
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if (tmp.matches(r))
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hasDesc = true;
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else {
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r = "^[[:space:]]*\\([^<]\\+\\)[[:space:]]*<\\([^>]\\+\\)";
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hasDesc = tmp.matches(r);
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}
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if (hasDesc) {
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m_desc = tmp.matchString(1);
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tmp = tmp.matchString(2);
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*const_cast<URI*>(this) = tmp;
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DDebug("URI",DebugAll,"new value='%s' [%p]",c_str(),this);
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}
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r = "<\\([^>]\\+\\)>";
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if (tmp.matches(r)) {
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tmp = tmp.matchString(1);
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*const_cast<URI*>(this) = tmp;
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DDebug("URI",DebugAll,"new value='%s' [%p]",c_str(),this);
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}
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// [proto:][user[:passwd]@]hostname[:port][/path][?param=value[¶m=value...]]
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// [proto:][user@]hostname[:port][/path][;params][?params][¶ms]
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r = "^\\([[:alpha:]]\\+:\\)\\?\\([^[:space:][:cntrl:]@]\\+@\\)\\?\\([[:alnum:]._-]\\+\\)\\(:[0-9]\\+\\)\\?";
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if (tmp.matches(r)) {
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m_proto = tmp.matchString(1).toLower();
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m_proto = m_proto.substr(0,m_proto.length()-1);
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m_user = tmp.matchString(2);
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m_user = m_user.substr(0,m_user.length()-1);
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m_host = tmp.matchString(3).toLower();
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tmp = tmp.matchString(4);
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tmp >> ":" >> m_port;
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DDebug("URI",DebugAll,"desc='%s' proto='%s' user='%s' host='%s' port=%d [%p]",
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m_desc.c_str(), m_proto.c_str(), m_user.c_str(), m_host.c_str(), m_port, this);
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}
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else {
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m_desc.clear();
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m_proto.clear();
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m_user.clear();
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m_host.clear();
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}
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m_parsed = true;
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}
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SIPParty::SIPParty()
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: m_reliable(false)
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{
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DDebug(DebugAll,"SIPParty::SIPParty() [%p]",this);
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}
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SIPParty::SIPParty(bool reliable)
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: m_reliable(reliable)
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{
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DDebug(DebugAll,"SIPParty::SIPParty(%d) [%p]",reliable,this);
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}
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SIPParty::~SIPParty()
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{
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DDebug(DebugAll,"SIPParty::~SIPParty() [%p]",this);
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}
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SIPEvent::SIPEvent(SIPMessage* message, SIPTransaction* transaction)
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: m_message(message), m_transaction(transaction),
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m_state(SIPTransaction::Invalid)
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{
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DDebug(DebugAll,"SIPEvent::SIPEvent(%p,%p) [%p]",message,transaction,this);
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if (m_message)
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m_message->ref();
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if (m_transaction) {
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m_transaction->ref();
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m_state = m_transaction->getState();
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}
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}
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SIPEvent::~SIPEvent()
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{
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DDebug(DebugAll,"SIPEvent::~SIPEvent() [%p]",this);
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if (m_transaction)
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m_transaction->deref();
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if (m_message)
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m_message->deref();
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}
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SIPEngine::SIPEngine(const char* userAgent)
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: m_mutex(true),
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m_t1(500000), m_t4(5000000), m_maxForwards(70),
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m_cseq(0), m_userAgent(userAgent), m_nonce_time(0)
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{
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debugName("sipengine");
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DDebug(this,DebugInfo,"SIPEngine::SIPEngine() [%p]",this);
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if (m_userAgent.null())
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m_userAgent << "YATE/" << YATE_VERSION;
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m_allowed = "ACK";
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char tmp[32];
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::snprintf(tmp,sizeof(tmp),"%08x",::rand() ^ (int)Time::now());
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m_nonce_secret = tmp;
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}
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SIPEngine::~SIPEngine()
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{
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DDebug(this,DebugInfo,"SIPEngine::~SIPEngine() [%p]",this);
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}
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SIPTransaction* SIPEngine::addMessage(SIPParty* ep, const char* buf, int len)
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{
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DDebug(this,DebugInfo,"addMessage(%p,%d) [%p]",buf,len,this);
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SIPMessage* msg = SIPMessage::fromParsing(ep,buf,len);
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if (ep)
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ep->deref();
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if (msg) {
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SIPTransaction* tr = addMessage(msg);
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msg->deref();
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return tr;
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}
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return 0;
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}
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SIPTransaction* SIPEngine::addMessage(SIPMessage* message)
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{
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DDebug(this,DebugInfo,"addMessage(%p) [%p]",message,this);
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if (!message)
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return 0;
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// make sure outgoing messages are well formed
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if (message->isOutgoing())
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message->complete(this);
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// locate the branch parameter of last Via header - added by the UA
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const SIPHeaderLine* hl = message->getLastHeader("Via");
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const NamedString* br = hl ? hl->getParam("branch") : 0;
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String branch(br ? *br : String::empty());
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if (!branch.startsWith("z9hG4bK"))
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branch.clear();
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Lock lock(m_mutex);
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SIPTransaction* forked = 0;
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ObjList* l = &TransList;
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for (; l; l = l->next()) {
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SIPTransaction* t = static_cast<SIPTransaction*>(l->get());
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if (!t)
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continue;
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switch (t->processMessage(message,branch)) {
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case SIPTransaction::Matched:
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return t;
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case SIPTransaction::NoDialog:
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forked = t;
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break;
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case SIPTransaction::NoMatch:
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default:
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break;
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}
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}
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if (forked)
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return forkInvite(message,forked);
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if (message->isAnswer()) {
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Debug(this,DebugInfo,"Message %p was an unhandled answer [%p]",message,this);
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return 0;
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}
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if (message->isACK()) {
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DDebug(this,DebugAll,"Message %p was an unhandled ACK [%p]",message,this);
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return 0;
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}
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message->complete(this);
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return new SIPTransaction(message,this,message->isOutgoing());
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}
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SIPTransaction* SIPEngine::forkInvite(SIPMessage* answer, const SIPTransaction* trans)
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{
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// TODO: build new transaction or CANCEL
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Debug(this,DebugInfo,"Message %p was a forked INVITE answer [%p]",answer,this);
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return 0;
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}
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bool SIPEngine::process()
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{
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SIPEvent* e = getEvent();
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if (!e)
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return false;
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DDebug(this,DebugInfo,"process() got event %p",e);
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processEvent(e);
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return true;
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}
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SIPEvent* SIPEngine::getEvent()
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{
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Lock lock(m_mutex);
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ObjList* l = &TransList;
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for (; l; l = l->next()) {
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SIPTransaction* t = static_cast<SIPTransaction*>(l->get());
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if (t) {
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SIPEvent* e = t->getEvent();
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if (e) {
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DDebug(this,DebugInfo,"Got event %p (state %s) from transaction %p [%p]",
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e,SIPTransaction::stateName(e->getState()),t,this);
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return e;
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}
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}
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}
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return 0;
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}
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void SIPEngine::processEvent(SIPEvent *event)
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{
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if (!event)
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return;
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Lock lock(m_mutex);
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const char* type = "unknown";
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if (event->isOutgoing())
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type = "outgoing";
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if (event->isIncoming())
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type = "incoming";
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DDebug(this,DebugAll,"Processing %s event %p message %p [%p]",
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type,event,event->getMessage(),this);
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if (event->getMessage()) {
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if (event->isOutgoing()) {
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switch (event->getState()) {
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case SIPTransaction::Invalid:
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break;
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case SIPTransaction::Cleared:
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if (!event->getMessage()->isAnswer())
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break;
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default:
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if (event->getParty())
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event->getParty()->transmit(event);
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}
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}
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if (event->isIncoming()) {
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if ((event->getState() == SIPTransaction::Trying) &&
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!event->getMessage()->isAnswer()) {
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Debug(this,DebugInfo,"Rejecting unhandled request '%s' in event %p [%p]",
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event->getMessage()->method.c_str(),event,this);
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event->getTransaction()->setResponse(405);
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}
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}
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}
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delete event;
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}
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u_int64_t SIPEngine::getUserTimeout() const
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{
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// by default allow 2 minutes for user interaction
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return 120000000;
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}
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u_int64_t SIPEngine::getTimer(char which, bool reliable) const
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{
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switch (which) {
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case '1':
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// T1: RTT Estimate 500ms default
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return m_t1;
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case '2':
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// T2: Maximum retransmit interval
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// for non-INVITE requests and INVITE responses
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return 4000000;
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case '4':
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// T4: Maximum duration a message will remain in the network
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return m_t4;
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case 'A':
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// A: INVITE request retransmit interval, for UDP only
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return m_t1;
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case 'B':
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// B: INVITE transaction timeout timer
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return 64*m_t1;
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case 'C':
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// C: proxy INVITE transaction timeout
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return 180000000;
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case 'D':
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// D: Wait time for response retransmits
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return reliable ? 0 : 32000000;
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case 'E':
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// E: non-INVITE request retransmit interval, UDP only
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return m_t1;
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case 'F':
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// F: non-INVITE transaction timeout timer
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return 64*m_t1;
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case 'G':
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// G: INVITE response retransmit interval
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return m_t1;
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case 'H':
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// H: Wait time for ACK receipt
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return 64*m_t1;
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case 'I':
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// I: Wait time for ACK retransmits
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return reliable ? 0 : m_t4;
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case 'J':
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// J: Wait time for non-INVITE request retransmits
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return reliable ? 0 : 64*m_t1;
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case 'K':
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// K: Wait time for response retransmits
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return reliable ? 0 : m_t4;
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}
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Debug(this,DebugMild,"Requested invalid timer '%c' [%p]",which,this);
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return 0;
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}
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void SIPEngine::nonceGet(String& nonce)
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{
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m_nonce_mutex.lock();
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unsigned int t = Time::secNow();
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if (t != m_nonce_time) {
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m_nonce_time = t;
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String tmp(m_nonce_secret);
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tmp << "." << t;
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MD5 md5(tmp);
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m_nonce = md5.hexDigest();
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m_nonce << "." << t;
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XDebug(this,DebugAll,"Generated new nonce '%s' [%p]",
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m_nonce.c_str(),this);
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}
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nonce = m_nonce;
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m_nonce_mutex.unlock();
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}
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long SIPEngine::nonceAge(const String& nonce)
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{
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if (nonce.null())
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return -1;
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Lock lock(m_nonce_mutex);
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if (nonce == m_nonce)
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return Time::secNow() - m_nonce_time;
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lock.drop();
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int dot = nonce.find('.');
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if (dot < 0)
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return -1;
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String tmp(nonce.substr(dot+1));
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if (tmp.null())
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return -1;
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unsigned int t = 0;
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tmp >> t;
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if (!tmp.null())
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return -1;
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tmp << m_nonce_secret << "." << t;
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MD5 md5(tmp);
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if (nonce.substr(0,dot) != md5.hexDigest())
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return -1;
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return Time::secNow() - t;
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}
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bool SIPEngine::checkUser(const String& username, const String& realm, const String& nonce,
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const String& method, const String& uri, const String& response, const SIPMessage* message)
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{
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return false;
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}
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// response = md5(md5(username:realm:password):nonce:md5(method:uri))
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void SIPEngine::buildAuth(const String& username, const String& realm, const String& passwd,
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const String& nonce, const String& method, const String& uri, String& response)
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{
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XDebug(this,DebugAll,"Building auth: '%s:%s:%s' '%s' '%s:%s'",
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username.c_str(),realm.c_str(),passwd.c_str(),nonce.c_str(),method.c_str(),uri.c_str());
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MD5 m1,m2;
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m1 << username << ":" << realm << ":" << passwd;
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m2 << method << ":" << uri;
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String tmp;
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tmp << m1.hexDigest() << ":" << nonce << ":" << m2.hexDigest();
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m1.clear();
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m1.update(tmp);
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response = m1.hexDigest();
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}
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// response = md5(hash_a1:nonce:hash_a2)
|
|
void SIPEngine::buildAuth(const String& hash_a1, const String& nonce, const String& hash_a2,
|
|
String& response)
|
|
{
|
|
MD5 md5;
|
|
md5 << hash_a1 << ":" << nonce << ":" << hash_a2;
|
|
response = md5.hexDigest();
|
|
}
|
|
|
|
int SIPEngine::authUser(const SIPMessage* message, String& user, bool proxy)
|
|
{
|
|
if (!message)
|
|
return -1;
|
|
const char* hdr = proxy ? "Proxy-Authorization" : "Authorization";
|
|
const ObjList* l = &message->header;
|
|
for (; l; l = l->next()) {
|
|
const GenObject* o = l->get();
|
|
const SIPHeaderLine* t = o ? static_cast<const SIPHeaderLine*>(o->getObject("SIPHeaderLine")) : 0;
|
|
if (t && (t->name() &= hdr) && (*t &= "Digest")) {
|
|
String usr(t->getParam("username"));
|
|
delQuotes(usr);
|
|
if (usr.null())
|
|
continue;
|
|
XDebug(this,DebugAll,"authUser found user '%s'",usr.c_str());
|
|
// if we know the username check if it matches
|
|
if (user && (usr != user))
|
|
continue;
|
|
String nonce(t->getParam("nonce"));
|
|
delQuotes(nonce);
|
|
// TODO: implement a nonce cache for the stupid clients that don't send it back
|
|
if (nonce.null())
|
|
continue;
|
|
// see if the nonce was generated by this engine
|
|
long age = nonceAge(nonce);
|
|
if (age < 0)
|
|
continue;
|
|
XDebug(this,DebugAll,"authUser nonce age is %ld",age);
|
|
String res(t->getParam("response"));
|
|
delQuotes(res);
|
|
if (res.null())
|
|
continue;
|
|
String uri(t->getParam("uri"));
|
|
delQuotes(uri);
|
|
if (uri.null())
|
|
uri = message->uri;
|
|
String realm(t->getParam("realm"));
|
|
delQuotes(realm);
|
|
|
|
if (!checkUser(usr,realm,nonce,message->method,uri,res,message))
|
|
continue;
|
|
|
|
if (user.null())
|
|
user = usr;
|
|
return age;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
bool SIPEngine::isAllowed(const char* method) const
|
|
{
|
|
int pos = m_allowed.find(method);
|
|
if (pos < 0)
|
|
return false;
|
|
if ((pos > 0) && (m_allowed[pos-1] != ' '))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
void SIPEngine::addAllowed(const char* method)
|
|
{
|
|
Lock lock(m_mutex);
|
|
if (method && *method && !isAllowed(method))
|
|
m_allowed << ", " << method;
|
|
}
|
|
|
|
/* vi: set ts=8 sw=4 sts=4 noet: */
|