270 lines
7.4 KiB
C++
270 lines
7.4 KiB
C++
/**
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* regexroute.cpp
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* This file is part of the YATE Project http://YATE.null.ro
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*
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* Regular expressions based routing
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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 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 <telengine.h>
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#include <telephony.h>
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#include <string.h>
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using namespace TelEngine;
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static Configuration s_cfg;
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class RouteHandler : public MessageHandler
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{
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public:
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RouteHandler(int prio)
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: MessageHandler("call.route",prio) { }
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virtual bool received(Message &msg);
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};
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static void setMessage(Message &msg, String &line)
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{
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ObjList *strs = line.split(';');
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bool first = true;
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for (ObjList *p = strs; p; p=p->next()) {
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String *s = static_cast<String*>(p->get());
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if (s) {
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int p1;
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while ((p1 = s->find("${")) >= 0) {
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// handle ${paramname} replacements
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int p2 = s->find('}',p1+2);
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if (p2 > 0) {
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String v = s->substr(p1+2,p2-p1-2);
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v.trimBlanks();
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DDebug("RegexRoute",DebugAll,"Replacing parameter '%s'",
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v.c_str());
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*s = s->substr(0,p1) + msg.getValue(v) + s->substr(p2+1);
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}
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}
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}
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if (first) {
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first = false;
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line = s ? *s : "";
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continue;
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}
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if (s && !s->trimBlanks().null()) {
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int q = s->find('=');
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if (q > 0) {
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String n = s->substr(0,q);
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String v = s->substr(q+1);
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n.trimBlanks();
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v.trimBlanks();
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DDebug("RegexRoute",DebugAll,"Setting '%s' to '%s'",n.c_str(),v.c_str());
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msg.setParam(n,v);
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}
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else
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Debug("RegexRoute",DebugWarn,"Invalid setting '%s'",s->c_str());
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}
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}
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strs->destruct();
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}
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static bool oneContext(Message &msg, String &str, const String &context, String &ret, int depth = 0)
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{
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if (!(context && *context))
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return false;
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if (depth > 5) {
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Debug("RegexRoute",DebugWarn,"Possible loop detected, current context '%s'",context.c_str());
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return false;
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}
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NamedList *l = s_cfg.getSection(context);
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if (l) {
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unsigned int len = l->length();
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for (unsigned int i=0; i<len; i++) {
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NamedString *n = l->getParam(i);
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if (n) {
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Regexp r(n->name());
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String val;
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if (r.startsWith("${")) {
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// handle special case ${paramname}regexp=value
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int p = r.find('}');
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if (p < 3) {
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Debug("RegexRoute",DebugWarn,"Invalid parameter match '%s' in rule #%u in context '%s'",
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r.c_str(),i+1,context.c_str());
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continue;
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}
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val = r.substr(2,p-2);
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r = r.substr(p+1);
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val.trimBlanks();
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r.trimBlanks();
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if (val.null() || r.null()) {
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Debug("RegexRoute",DebugWarn,"Missing parameter or rule in rule #%u in context '%s'",
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i+1,context.c_str());
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continue;
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}
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NDebug("RegexRoute",DebugAll,"Using message parameter '%s'",
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val.c_str());
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val = msg.getValue(val);
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}
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else
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val = str;
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val.trimBlanks();
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if (val.matches(r)) {
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val = val.replaceMatches(*n);
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setMessage(msg,val);
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val.trimBlanks();
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if (val.null()) {
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// special case: do nothing on empty target
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continue;
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}
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else if (val == "return") {
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NDebug("RegexRoute",DebugAll,"Returning false from context '%s'", context.c_str());
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return false;
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}
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else if (val.startSkip("goto") || val.startSkip("jump")) {
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NDebug("RegexRoute",DebugAll,"Jumping to context '%s' by rule #%u '%s'",
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val.c_str(),i+1,n->name().c_str());
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return oneContext(msg,str,val,ret,depth+1);
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}
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else if (val.startSkip("include") || val.startSkip("call")) {
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NDebug("RegexRoute",DebugAll,"Including context '%s' by rule #%u '%s'",
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val.c_str(),i+1,n->name().c_str());
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if (oneContext(msg,str,val,ret,depth+1)) {
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DDebug("RegexRoute",DebugAll,"Returning true from context '%s'", context.c_str());
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return true;
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}
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}
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else if (val.startSkip("match") || val.startSkip("newmatch")) {
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if (!val.null()) {
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NDebug("RegexRoute",DebugAll,"Setting match string '%s' by rule #%u '%s' in context '%s'",
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val.c_str(),i+1,n->name().c_str(),context.c_str());
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str = val;
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}
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}
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else {
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DDebug("RegexRoute",DebugAll,"Returning '%s' for '%s' in context '%s' by rule #%u '%s'",
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val.c_str(),str.c_str(),context.c_str(),i+1,n->name().c_str());
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ret = val;
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return true;
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}
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}
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}
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}
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}
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DDebug("RegexRoute",DebugAll,"Returning false at end of context '%s'", context.c_str());
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return false;
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}
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bool RouteHandler::received(Message &msg)
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{
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unsigned long long tmr = Time::now();
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String called(msg.getValue("called"));
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if (called.null())
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return false;
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const char *context = msg.getValue("context","default");
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String ret;
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if (oneContext(msg,called,context,ret)) {
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Debug(DebugInfo,"Routing call to '%s' in context '%s' via '%s' in %llu usec",
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called.c_str(),context,ret.c_str(),Time::now()-tmr);
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msg.retValue() = ret;
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return true;
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}
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Debug(DebugInfo,"Could not route call to '%s' in context '%s', wasted %llu usec",
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called.c_str(),context,Time::now()-tmr);
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return false;
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};
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class PrerouteHandler : public MessageHandler
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{
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public:
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PrerouteHandler(int prio)
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: MessageHandler("call.preroute",prio) { }
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virtual bool received(Message &msg);
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};
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bool PrerouteHandler::received(Message &msg)
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{
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unsigned long long tmr = Time::now();
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// return immediately if there is already a context
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if (msg.getValue("context"))
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return false;
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String caller(msg.getValue("caller"));
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if (caller.null()) {
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caller << msg.getValue("driver") << "/";
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caller << msg.getValue("span") << "/";
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caller << msg.getValue("channel");
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}
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if (caller == "//")
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return false;
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String ret;
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if (oneContext(msg,caller,"contexts",ret)) {
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Debug(DebugInfo,"Classifying caller '%s' in context '%s' in %llu usec",
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caller.c_str(),ret.c_str(),Time::now()-tmr);
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msg.addParam("context",ret);
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return true;
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}
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Debug(DebugInfo,"Could not classify call from '%s', wasted %llu usec",
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caller.c_str(),Time::now()-tmr);
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return false;
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};
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class RegexRoutePlugin : public Plugin
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{
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public:
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RegexRoutePlugin();
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virtual void initialize();
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private:
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MessageHandler *m_preroute, *m_route;
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};
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RegexRoutePlugin::RegexRoutePlugin()
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: m_preroute(0), m_route(0)
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{
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Output("Loaded module RegexRoute");
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}
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void RegexRoutePlugin::initialize()
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{
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Output("Initializing module RegexRoute");
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s_cfg = Engine::configFile("regexroute");
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s_cfg.load();
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if (m_preroute) {
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delete m_preroute;
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m_preroute = 0;
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}
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if (m_route) {
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delete m_route;
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m_route = 0;
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}
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unsigned priority = s_cfg.getIntValue("priorities","preroute",100);
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if (priority) {
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m_preroute = new PrerouteHandler(priority);
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Engine::install(m_preroute);
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}
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priority = s_cfg.getIntValue("priorities","route",100);
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if (priority) {
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m_route = new RouteHandler(priority);
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Engine::install(m_route);
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}
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}
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INIT_PLUGIN(RegexRoutePlugin);
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/* vi: set ts=8 sw=4 sts=4 noet: */
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