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kamailio/modules/app_java/README-draft

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app_java Module
Konstantin Mosesov
Edited by
Konstantin Mosesov
<konstantinm@voipgroup.org.ua>
Copyright © 2013 Konstantin Mosesov
__________________________________________________________________
Table of Contents
1. Admin Guide
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1. class_name (string)
3.2. child_init_method (string)
3.3. java_options (string)
3.4. force_cmd_exec (int)
4. Functions
4.0. Common requirements.
4.1. java_method_exec(method, method_signature, [param1[, param2]])
4.2. java_s_method_exec(method, method_signature, [param1[, param2]])
4.3. java_staticmethod_exec(method, method_signature, [param1[, param2]])
4.4. java_s_staticmethod_exec(method, method_signature, [param1[, param2]])
5. Java module API
5.0. Minimal program skeleton and structure of package org.siprouter
5.0.1. Minimal program skeleton
5.0.2. Structure of package org.siprouter
5.1. abstract class NativeMethods
5.1.1. General logging
5.1.1.0. Logging levels and facilities
5.1.1.1. native void LM_GEN1(int logLevel, String s);
5.1.1.2. native void LM_GEN2(int logFacility, int logLevel, String s);
5.1.1.3. native void LM_ALERT(String s);
5.1.1.4. native void LM_CRIT(String s);
5.1.1.5. native void LM_WARN(String s);
5.1.1.6. native void LM_NOTICE(String s);
5.1.1.7. native void LM_ERR(String s);
5.1.1.8. native void LM_INFO(String s);
5.1.1.9. native void LM_DBG(String s);
5.1.2. Execution of kamailio commands
5.1.2.1. static native int KamExec(String fname, String... params);
5.1.2.2. static native int SetURI(String ruri);
5.1.2.3. static native int RewriteURI(String ruri);
5.2. class IPPair.
5.2.1. final String ip;
5.2.2. final int port;
5.3. abstract class SipMsg
5.3.0. Internal structure understanding.
5.3.1. int id;
5.3.2. int pid;
5.3.3. String eoh;
5.3.4. String unparsed;
5.3.5. String buf;
5.3.6. int len;
5.3.7. String new_uri;
5.3.8. String dst_uri;
5.3.9. int parsed_uri_ok;
5.3.10. int parsed_orig_ruri_ok;
5.3.11. String add_to_branch_s;
5.3.12. int add_to_branch_len;
5.3.13. int hash_index;
5.3.14. int msg_flags;
5.3.15. static native SipMsg ParseSipMsg();
5.3.16. static native String getMsgType();
5.3.17. static native String getRURI();
5.3.18. static native IPPair getSrcAddress();
5.3.19. static native IPPair getDstAddress();
5.3.20. static native String getBuffer();
5.4. interface NativeInterface
5.4.1. abstract class Ranks
5.4.1.1. static final int PROC_MAIN
5.4.1.2. static final int PROC_TIMER
5.4.1.3. static final int PROC_RPC
5.4.1.4. static final int PROC_FIFO
5.4.1.5. static final int PROC_TCP_MAIN
5.4.1.6. static final int PROC_UNIXSOCK
5.4.1.7. static final int PROC_ATTENDANT
5.4.1.8. static final int PROC_INIT
5.4.1.9. static final int PROC_NOCHLDINIT
5.4.1.10. static final int PROC_SIPINIT
5.4.1.11. static final int PROC_SIPRPC
5.4.1.12. static final int PROC_MIN
5.4.2. abstract class LogParams
5.4.2.0. Loggigng params
5.4.2.1. static final int L_ALERT
5.4.2.2. static final int L_BUG
5.4.2.3. static final int L_CRIT2
5.4.2.4. static final int L_CRIT
5.4.2.5. static final int L_ERR
5.4.2.6. static final int L_WARN
5.4.2.7. static final int L_NOTICE
5.4.2.8. static final int L_INFO
5.4.2.9. static final int L_DBG
5.4.2.10. static final int DEFAULT_FACILITY
5.5. Examples of usage Java API
List of Examples
1.1. Set class_name parameter
1.2. Set child_init_method parameter
1.3. Set java_options parameter
1.4. Set java_options parameter (live configuration)
1.5. Set java_options parameter (verbose configuration)
1.6. Set java_options parameter (debug configuration)
2.0. Example of usage signatures.
2.1. Example of usage java_method_exec()
2.2. Example of usage java_s_method_exec()
2.3. Example of usage java_staticmethod_exec()
3.4. Example of usage java_s_staticmethod_exec()
Chapter 1. Admin Guide
Table of Contents
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1. class_name (string)
3.2. child_init_method (string)
3.3. java_options (string)
3.4. force_cmd_exec (int)
4. Functions
4.0. Common requirements.
4.1. java_method_exec(method, method_signature, [param1[, param2]]) - class method
4.2. java_s_method_exec(method, method_signature, [param1[, param2]]) - class synchronized method
4.3. java_staticmethod_exec(method, method_signature, [param1[, param2]]) - static method
4.4. java_s_staticmethod_exec(method, method_signature, [param1[, param2]]) - static synchronized method
1. Overview
This module allows executing Java compiled classes from config file, exporting
functions to access the SIP message from Java using Java Native Interface (JNI).
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
2.3. Java runtime
2.1. Kamailio Modules
The following modules must be loaded before this module:
* none.
2.2. External Libraries or Applications
Legend:
* - Runtime library, required to launch
R - Required
O - Optional
D - Development (for building-rebuilding java)
P - Dependance of package
The following libraries or applications must be installed before
running Kamailio with this module loaded:
[*] java-common - Base of all Java packages
[*] default-jre - Standard Java or Java compatible Runtime
[*] gcj-jre - Java runtime environment using GIJ/classpath
[*] libgcj12 (>=12) - Java runtime library for use with gcj
[DR] ant - Java based build tool like make
[DO] ant-contrib - collection of tasks, types and other tools for Apache Ant
[DPO] ant-gcj - Java based build tool like make (GCJ)
[DPO] ant-optional - Java based build tool like make - optional libraries
[DPO] ant-optional-gcj - Java based build tool like make - optional libraries (GCJ)
[DR] default-jdk - Standard Java or Java compatible Development Kit
[DR] gcj-jdk - gcj and classpath development tools for Java(TM)
[DR] libgcj13-dev (>=12) - Java development headers for use with gcj
[DO] jdk - JDK Development Kit (either oracle jdk or openjdk)
The following libraries or applications must be compiled before
running Kamailio with this module loaded:
[*] <class_name>.class
[*] kamailio.jar
2.3. Java runtime
Java runtime library (JRE or JDK) is required to use this module.
3. Parameters
3.1. class_name (string)
3.2. child_init_method (string)
3.3. java_options (string)
3.4. force_cmd_exec (int)
3.1. class_name (string)
The class name should have the same compiled file name.
If the value is "Kamailio", then the compiled file should be named as "Kamailio.class".
Default value is “Kamailio”.
Example 1.1. Set class_name parameter
...
modparam("app_java", "class_name", "Kamailio")
...
3.2. child_init_method (string)
TBD.
Default value is “child_init”.
Example 1.2. Set child_init_method parameter
...
modparam("app_java", "child_init_method", "my_mod_init")
...
3.3. java_options (string)
Java options for Java Virtual Machine.
For more info see: http://docs.oracle.com/javase/6/docs/technotes/tools/windows/java.html
Default value is “-Djava.compiler=NONE”.
Example 1.3. Set java_options parameter
...
modparam("app_java", "java_options", "-Djava.compiler=NONE")
...
Example 1.4. Set java_options parameter (live configuration)
...
modparam("app_java", "java_options", "-Djava.compiler=NONE -Djava.class.path=/path/to/kamailio/modules:/path/to/<class_name>_file_directory:/path/to/kamailio.jar")
...
Example 1.5. Set java_options parameter (verbose configuration)
...
modparam("app_java", "java_options", "-verbose:gc,class,jni -Djava.compiler=NONE -Djava.class.path=/path/to/kamailio/modules:/path/to/class_name_file_directory:/path/to/kamailio.jar")
...
Example 1.6. Set java_options parameter (debug configuration)
...
modparam("app_java", "java_options", "-Xdebug -verbose:gc,class,jni -Djava.compiler=NONE -Djava.class.path=/path/to/kamailio/modules:/path/to/class_name_file_directory:/path/to/kamailio.jar")
...
3.4. force_cmd_exec (int)
This parameter forces execution a kamailio comnmand with java native method KamExec_raw.
Note: may cause a memory leaks if used from embedded languages.
Default value is 0 (off).
4. Functions
4.0. Common requirements.
4.1. java_method_exec(method, method_signature, [param1[, param2]])
4.2. java_s_method_exec(method, method_signature, [param1[, param2]])
4.3. java_staticmethod_exec(method, method_signature, [param1[, param2]])
4.4. java_s_staticmethod_exec(method, method_signature, [param1[, param2]])
4.0. Common requirements.
Each function has a required parameter “method_signature”.
For more info see: http://www.rgagnon.com/javadetails/java-0286.html
There are two parts to the signature. The first part is enclosed within the parentheses and represents the method's arguments.
The second portion follows the closing parenthesis and represents the return type. The mapping between the Java type and C type is
Type Chararacter
boolean Z
byte B
char C
double D
float F
int I
long J
object L
short S
void V
array [
Note that to specify an object, the "L" is followed by the object's class name and ends with a semi-colon, ';' .
app_java supports the following signatures
primitives: Z,B,C,D,F,I,J,L,S,V
objects:
Ljava/lang/Boolean;
Ljava/lang/Byte;
Ljava/lang/Character;
Ljava/lang/Double;
Ljava/lang/Float;
Ljava/lang/Integer;
Ljava/lang/Long;
Ljava/lang/Short;
Ljava/lang/String;
NULL parameter: V
Each parameter passed to function will be cast according to given signature.
Example 2.0. Example of usage signatures.
0. Equivalent of java prototype: public int ExampleMethod();
...
java_method_exec("ExampleMethod", "V");
...
1. Equivalent of java prototype: public int ExampleMethod(String param1, int param2);
...
java_method_exec("ExampleMethod", "Ljava/lang/String;I", "Hello world", "5");
...
In the above scenario parameter 2 ("5") will be cast to integer representation.
2. Equivalent of java prototype: public int ExampleMethod(boolean param1, byte param2);
...
java_method_exec("ExampleMethod", "ZB", "true", "0x05");
...
In the above scenario parameter 1 ("true") will be cast to boolean representation.
Parameters are optional, ommitting a parameter meant the passed value is NULL.
Parameters count should be exactly the same as signature count.
Note, you shall use a correct signature, e.g. the following examples of combinations are invalid:
*) java_method_exec("ExampleMethod", "ZI", "False");
*) java_method_exec("ExampleMethod", "VI", "", "5");
*) java_method_exec("ExampleMethod", "LI", "something", "5");
4.1. java_method_exec(method, method_signature, [param1[, param2]])
Executes a java method “method”. Parameter “method_signature” is required (see 4.0).
Example 2.1. java_method_exec usage
...
# Equivalent of java prototype: public int ExampleMethod();
java_method_exec("ExampleMethod", "V");
# Equivalent of java prototype: public int ExampleMethod(String SipMessageBuffer, int SipMessageLenght);
java_method_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");
...
4.2. java_s_method_exec(method, method_signature, [param1[, param2]])
Executes a java synchronized method “method”. Parameter “method_signature” is required (see 4.0).
See a more info about to synchronization: http://docs.oracle.com/javase/tutorial/essential/concurrency/syncmeth.html
Example 2.2. java_s_method_exec usage
...
# Equivalent of java prototype: public synchronized int ExampleMethod();
java_s_method_exec("ExampleMethod", "V");
# Equivalent of java prototype: public synchronized int ExampleMethod(String SipMessageBuffer, int SipMessageLenght);
java_s_method_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");
...
4.3. java_staticmethod_exec(method, method_signature, [param1[, param2]])
Executes a java static method “method”. Parameter “method_signature” is required (see 4.0).
Example 2.3. java_staticmethod_exec usage
...
# Equivalent of java prototype: public static int ExampleMethod();
java_staticmethod_exec("ExampleMethod", "V");
# Equivalent of java prototype: public static int ExampleMethod(String SipMessageBuffer, int SipMessageLenght);
java_staticmethod_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");
...
4.4. java_s_staticmethod_exec(method, method_signature, [param1[, param2]])
Executes a java synchronized static method “method”. Parameter “method_signature” is required (see 4.0).
See a more info about to synchronization: http://docs.oracle.com/javase/tutorial/essential/concurrency/syncmeth.html
Example 2.4. java_s_staticmethod_exec usage
...
# Equivalent of java prototype: public static synchronized int ExampleMethod();
java_s_staticmethod_exec("ExampleMethod", "V");
# Equivalent of java prototype: public static synchronized int ExampleMethod(String SipMessageBuffer, int SipMessageLenght);
java_s_staticmethod_exec("ExampleMethod", "Ljava/lang/String;I", "$mb", "$ml");
...
5. Java module API
5.0. Minimal program skeleton and structure of package org.siprouter
5.0.1. Minimal program skeleton
...
import org.siprouter.*;
import org.siprouter.NativeInterface.*;
public class Kamailio extends NativeMethods
{
/* Here you should specify a full path to app_java.so */
static
{
System.load("/opt/kamailio/lib/kamailio/modules/app_java.so");
}
/* Constructor. Do not remove !!! */
public Kamailio()
{
}
/*
This method should be executed for each children process, immediately after forking.
Required. Do not remove !!!
*/
public int child_init(int rank)
{
return 1;
}
}
...
5.0.2. Structure of package org.siprouter
org.siprouter ---*---*--*-------> class NativeMethods
| | +--> class IPPair
| +--> class SipMsg
+--> interface NativeInterface
|
+--> class Ranks
+--> class LogParams
5.1. abstract class NativeMethods
5.1.1. General logging
5.1.1.0. Log levels and facilities
Log levels:
L_ALERT = -5
L_BUG = -4
L_CRIT2 = -3
L_CRIT = -2
L_ERR = -1
L_WARN = 0
L_NOTICE = 1
L_INFO = 2
L_DBG = 3
Log facilities (see man syslog(3)):
DEFAULT_FACILITY = 0 (LOG_KERN (Linux))
1. Example of usage log levels and facilities:
LM_GEN1(LogParams.L_BUG, "Hello World!\n");
produces (example of output):
0(3003) BUG: app_java [java_native_methods.c:255]: Hello World!
2. Example of usage log levels and facilities:
LM_GEN2(LogParams.DEFAULT_FACILITY, LogParams.L_WARN, "Hello World!\n");
produces (example of output):
2(3147) WARNING: app_java [java_native_methods.c:279]: Hello World!
5.1.1.1. native void LM_GEN1(int logLevel, String s);
5.1.1.2. native void LM_GEN2(int logFacility, int logLevel, String s);
5.1.1.3. native void LM_ALERT(String s);
5.1.1.4. native void LM_CRIT(String s);
5.1.1.5. native void LM_WARN(String s);
5.1.1.6. native void LM_NOTICE(String s);
5.1.1.7. native void LM_ERR(String s);
5.1.1.8. native void LM_INFO(String s);
5.1.1.9. native void LM_DBG(String s);
5.1.2. Execution of kamailio commands
5.1.2.1. static native int KamExec(String fname, String... params);
Executes a kamailio command.
Parameter 'fname' - Required. Kamailio function name.
Parameter 'params' - An array of string parameters. Note, this method allows up to 6 params,
it will ignore all parameters if more than 6.
Returns:
1 - command was successfully executed.
-1 - execution of command was failed.
5.1.2.2. static native int SetURI(String ruri);
Rewrites the request URI.
Returns:
1 - Ok
-1 - Failed
Online reference: http://www.kamailio.org/wiki/cookbooks/3.3.x/core#rewriteuri
5.1.2.3. static native int RewriteURI(String ruri);
Rewrites the request URI.
Alias method: SetURI
Returns:
1 - Ok
-1 - Failed
Online reference: http://www.kamailio.org/wiki/cookbooks/3.3.x/core#rewriteuri
5.2. class IPPair.
Represents an IP-address pair (IP, Port)
5.2.1. final String ip;
IP Address
5.2.2. final int port;
Port
5.3. abstract class SipMsg
5.3.0. Internal structure understanding.
The class SipMsg is partially incapsulating kamailio's struct sip_msg.
References: parser/msg_parser.h, parser/parse_fline.h
5.3.1. int id;
Message id, unique/process
5.3.2. int pid;
Process ID
5.3.3. String eoh;
Pointer to the end of header (if found) or null
5.3.4. String unparsed;
Here we stopped parsing
5.3.5. String buf;
Scratch pad, holds a modified message, via, etc. point into it.
5.3.6. int len;
Message len (orig)
5.3.7. String new_uri;
Changed first line uri, when you change this
5.3.8. String dst_uri;
Destination URI, must be forwarded to this URI if dst_url lenght != 0
5.3.9. int parsed_uri_ok;
1 if parsed_orig_uri is valid, 0 if not, set if to 0 if you modify the uri (e.g change new_uri)
5.3.10. int parsed_orig_ruri_ok;
1 if parsed_orig_uri is valid, 0 if not, set if to 0 if you modify the uri (e.g change new_uri)
5.3.11. String add_to_branch_s;
Whatever whoever want to append to branch comes here
5.3.12. int add_to_branch_len;
Lenght of add_to_branch_s
5.3.13. int hash_index;
Index to TM hash table; stored in core to avoid unnecessary calculations
5.3.14. int msg_flags;
Flags used by core. Allows to set various flags on the message; may be used
for simple inter-module communication or remembering processing state reache.
5.3.15. static native SipMsg ParseSipMsg();
This method is using to get an instance of class SipMsg and populate a properties
of this class with a fields specified at 5.3.1 - 5.3.14.
5.3.16. static native String getMsgType();
Gets a message type. Return value:
'SIP_REQUEST' - if message is request
'SIP_REPLY' - if message is reply
'SIP_INVALID' - if invalid message
5.3.17. static native String getRURI();
Gets a request URI (RURI).
5.3.18. static native IPPair getSrcAddress();
Gets a source IP address and port.
5.3.19. static native IPPair getDstAddress();
Gets a destination IP address and port.
5.3.20. static native String getBuffer();
Gets a message buffer.
5.4. interface NativeInterface
5.4.1. abstract class Ranks
5.4.1.1. static final int PROC_MAIN
Main ser process
5.4.1.2. static final int PROC_TIMER
Timer attendant process
5.4.1.3. static final int PROC_RPC
RPC type process
5.4.1.4. static final int PROC_FIFO
FIFO attendant process.
Alias to PROC_RPC.
5.4.1.5. static final int PROC_TCP_MAIN
TCP main process
5.4.1.6. static final int PROC_UNIXSOCK
Unix socket server
5.4.1.7. static final int PROC_ATTENDANT
Main "attendant process
5.4.1.8. static final int PROC_INIT
Special rank, the context is the main ser process, but this is
guaranteed to be executed before any rocess is forked, so it
can be used to setup shared variables that depend on some
after mod_init available information (e.g. total number of processes).
@warning child_init(PROC_MAIN) is again called in the same process (main)
(before tcp), so make sure you don't init things twice,
both in PROC_MAIN and PROC_INT
5.4.1.9. static final int PROC_NOCHLDINIT
no child init functions will be called if this rank is used in fork_process()
5.4.1.10. static final int PROC_SIPINIT
First SIP worker - some modules do special processing in this child,
like loading db data
5.4.1.11. static final int PROC_SIPRPC
Used to init RPC worker as SIP commands handler.
Don't do any special processing in the child init with this rank -
just bare child initialization
5.4.1.12. static final int PROC_MIN
Minimum process rank.
Alias to PROC_NOCHLDINIT.
5.4.2. abstract class LogParams
5.4.2.0. Loggigng params
5.4.2.1. static final int L_ALERT
5.4.2.2. static final int L_BUG
5.4.2.3. static final int L_CRIT2
5.4.2.4. static final int L_CRIT
5.4.2.5. static final int L_ERR
5.4.2.6. static final int L_WARN
5.4.2.7. static final int L_NOTICE
5.4.2.8. static final int L_INFO
5.4.2.9. static final int L_DBG
5.4.2.10. static final int DEFAULT_FACILITY
5.5. Examples of usage Java API
...
import java.lang.*;
import java.io.*;
import org.siprouter.*;
import org.siprouter.NativeInterface.*;
public class Kamailio extends NativeMethods
{
static
{
System.load("/opt/kamailio/lib/kamailio/modules/app_java.so");
}
/* Constructor. Do not remove !!! */
public Kamailio()
{
}
public int child_init(int rank)
{
switch (rank)
{
case Ranks.PROC_MAIN:
LM_INFO("We're at PROC_MAIN\n");
break;
case Ranks.PROC_TIMER:
LM_INFO("We're at PROC_TIMER\n");
break;
case Ranks.PROC_RPC:
LM_INFO("We're at PROC_RPC/PROC_FIFO\n");
break;
case Ranks.PROC_TCP_MAIN:
LM_INFO("We're at PROC_TCP_MAIN\n");
break;
case Ranks.PROC_UNIXSOCK:
LM_INFO("We're at PROC_UNIXSOCK\n");
break;
case Ranks.PROC_ATTENDANT:
LM_INFO("We're at PROC_ATTENDANT\n");
break;
case Ranks.PROC_INIT:
LM_INFO("We're at PROC_INIT\n");
break;
case Ranks.PROC_NOCHLDINIT:
LM_INFO("We're at PROC_NOCHLDINIT/PROC_MIN\n");
break;
case Ranks.PROC_SIPINIT:
LM_INFO("We're at PROC_SIPINIT\n");
break;
case Ranks.PROC_SIPRPC:
LM_INFO("We're at PROC_SIPRPC\n");
break;
}
return 1;
}
public int TestMethod()
{
LM_INFO(String.format("Msg Type: %s\n", SipMsg.getMsgType()));
IPPair src = SipMsg.getSrcAddress();
if (src != null)
{
LM_INFO(String.format("src address=%s, src port=%d\n", src.ip, src.port));
}
else
{
LM_ERR("IPPair src is null!");
}
IPPair dst = SipMsg.getDstAddress();
if (dst != null)
{
LM_INFO(String.format("dst address=%s, dst port=%d\n", dst.ip, dst.port));
}
else
{
LM_ERR("IPPair dst is null!");
}
LM_INFO(String.format("buffer:\n%s\n", SipMsg.getBuffer().trim()));
SipMsg msg = SipMsg.ParseSipMsg();
if (msg != null)
{
LM_INFO("msg:\n");
LM_INFO(String.format("\tid=%d\n", msg.id));
LM_INFO(String.format("\tpid=%d\n", msg.pid));
LM_INFO(String.format("\teoh='%s'\n", msg.eoh));
LM_INFO(String.format("\tunparsed='%s'\n", msg.unparsed));
LM_INFO(String.format("\tbuf='%s'\n", msg.buf));
LM_INFO(String.format("\tlen=%d\n", msg.len));
LM_INFO(String.format("\tnew_uri='%s'\n", msg.new_uri));
LM_INFO(String.format("\tdst_uri='%s'\n", msg.dst_uri));
LM_INFO(String.format("\tparsed_uri_ok=%d\n", msg.parsed_uri_ok));
LM_INFO(String.format("\tparsed_orig_ruri_ok=%d\n", msg.parsed_orig_ruri_ok));
LM_INFO(String.format("\tadd_to_branch_s='%s'\n", msg.add_to_branch_s));
LM_INFO(String.format("\tadd_to_branch_len=%d\n", msg.add_to_branch_len));
LM_INFO(String.format("\thash_index=%d\n", msg.hash_index));
LM_INFO(String.format("\tmsg_flags=%d\n", msg.msg_flags));
LM_INFO(String.format("\tset_global_address='%s'\n", msg.set_global_address));
LM_INFO(String.format("\tset_global_port='%s'\n", msg.set_global_port));
}
else
{
LM_ERR("SipMsg msg is null!\n");
}
return 1;
}
}
...
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