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doc 040000
CPL_tree.h 100644 8.09kB
Makefile 100644 460B
README 100644 15.86kB
cpl-06.dtd 100644 7.4kB
cpl.c 100644 24.62kB
cpl_db.c 100644 6.59kB
cpl_db.h 100644 1.84kB
cpl_env.h 100644 2.25kB
cpl_loader.c 100644 8.82kB
cpl_loader.h 100644 1.16kB
cpl_log.c 100644 1.91kB
cpl_log.h 100644 1.36kB
cpl_nonsig.c 100644 6.84kB
cpl_nonsig.h 100644 1.5kB
cpl_parser.c 100644 41.6kB
cpl_parser.h 100644 985B
cpl_proxy.h 100644 16.24kB
cpl_run.c 100644 27.15kB
cpl_run.h 100644 3.09kB
cpl_sig.c 100644 3.58kB
cpl_sig.h 100644 1.01kB
cpl_switches.h 100644 31.32kB
cpl_time.c 100644 23.79kB
cpl_time.h 100644 3.6kB
cpl_utils.h 100644 1.31kB
loc_set.h 100644 4.39kB
sub_list.c 100644 1.6kB
sub_list.h 100644 1.14kB
cpl-c Module Bogdan-Andrei Iancu Edited by Bogdan-Andrei Iancu Copyright � 2003 FhG FOKUS Revision History Revision $Revision$ $Date: 2008-08-06 12:08:33 +0200 (Mi, 06 Aug 2008) $ __________________________________________________________ Table of Contents 1. Admin Guide 1.1. Overview 1.2. Dependencies 1.2.1. Kamailio Modules 1.2.2. External Libraries or Applications 1.3. Exported Parameters 1.3.1. db_url (string) 1.3.2. db_table (string) 1.3.3. username_column (string) 1.3.4. domain_column (string) 1.3.5. cpl_xml_column (string) 1.3.6. cpl_bin_column (string) 1.3.7. cpl_dtd_file (string) 1.3.8. log_dir (string) 1.3.9. proxy_recurse (int) 1.3.10. proxy_route (int) 1.3.11. case_sensitive (int) 1.3.12. realm_prefix (string) 1.3.13. timer_avp (string) 1.3.14. lookup_domain (string) 1.3.15. lookup_append_branches (int) 1.3.16. use_domain (integer) 1.4. Exported Functions 1.4.1. cpl_run_script(type,mode) 1.4.2. cpl_process_register() 1.4.3. cpl_process_register_norpl() 1.5. Exported MI Functions 1.5.1. LOAD_CPL 1.5.2. REMOVE_CPL 1.5.3. GET_CPL 1.6. Installation and Running 1.6.1. Database setup List of Examples 1.1. Set db_url parameter 1.2. Set db_table parameter 1.3. Set username_column parameter 1.4. Set domain_column parameter 1.5. Set cpl_xml_column parameter 1.6. Set cpl_bin_column parameter 1.7. Set cpl_dtd_file parameter 1.8. Set log_dir parameter 1.9. Set proxy_recurse parameter 1.10. Set proxy_route parameter 1.11. Set case_sensitive parameter 1.12. Set realm_prefix parameter 1.13. Set timer_avp parameter 1.14. Set lookup_domain parameter 1.15. Set lookup_append_branches parameter 1.16. Set use_domain parameter 1.17. cpl_run_script usage 1.18. cpl_process_register usage 1.19. cpl_process_register_norpl usage Chapter 1. Admin Guide 1.1. Overview cpl-c modules implements a CPL (Call Processing Language) interpreter. Support for uploading/downloading/removing scripts via SIP REGISTER method is present. 1.2. Dependencies 1.2.1. Kamailio Modules The following modules must be loaded before this module: * any DB module- a DB module for interfacing the DB operations (modules like mysql, postgres, dbtext, etc) * TM (Transaction) module- used for proxying/forking requests * SL (StateLess) module - used for sending stateless reply when responding to REGISTER request or for sending back error responses * USRLOC (User Location) module - used for implementing lookup("registration") tag (adding into location set of the users' contact) 1.2.2. External Libraries or Applications The following libraries or applications must be installed before running Kamailio with this module loaded: * libxml2 and libxml2-devel - on some SO, these to packages are merged into libxml2. This library contains an engine for XML parsing, DTD validation and DOM manipulation. 1.3. Exported Parameters 1.3.1. db_url (string) A SQL URL have to be given to the module for knowing where the database containing the table with CPL scripts is locates. If required a user name and password can be specified for allowing the module to connect to the database server. Default value is "mysql://openser:openserrw@localhost/openser". Example 1.1. Set db_url parameter ... modparam("cpl-c","db_url","dbdriver://username:password@dbhost/dbname") ... 1.3.2. db_table (string) Indicates the name of the table that store the CPL scripts. This table must be locate into the database specified by "db_url" parameter. For more about the format of the CPL table please see the modules/cpl-c/init.mysql file. Default value is "cpl". Example 1.2. Set db_table parameter ... modparam("cpl-c","cpl_table","cpl") ... 1.3.3. username_column (string) Indicates the name of the column used for storing the username. Default value is "username". Example 1.3. Set username_column parameter ... modparam("cpl-c","username_column","username") ... 1.3.4. domain_column (string) Indicates the name of the column used for storing the domain. Default value is "domain". Example 1.4. Set domain_column parameter ... modparam("cpl-c","domain_column","domain") ... 1.3.5. cpl_xml_column (string) Indicates the name of the column used for storing the the XML version of the cpl script. Default value is "cpl_xml". Example 1.5. Set cpl_xml_column parameter ... modparam("cpl-c","cpl_xml_column","cpl_xml") ... 1.3.6. cpl_bin_column (string) Indicates the name of the column used for storing the the binary version of the cpl script (compiled version). Default value is "cpl_bin". Example 1.6. Set cpl_bin_column parameter ... modparam("cpl-c","cpl_bin_column","cpl_bin") ... 1.3.7. cpl_dtd_file (string) Points to the DTD file describing the CPL grammar. The file name may include also the path to the file. This path can be absolute or relative (be careful the path will be relative to the starting directory of Kamailio). This parameter is MANDATORY! Example 1.7. Set cpl_dtd_file parameter ... modparam("cpl-c","cpl_dtd_file","/etc/kamailio/cpl-06.dtd") ... 1.3.8. log_dir (string) Points to a directory where should be created all the log file generated by the LOG CPL node. A log file per user will be created (on demand) having the name username.log. If this parameter is absent, the logging will be disabled without generating error on execution. Example 1.8. Set log_dir parameter ... modparam("cpl-c","log_dir","/var/log/kamailio/cpl") ... 1.3.9. proxy_recurse (int) Tells for how many time is allow to have recurse for PROXY CPL node If it has value 2, when doing proxy, only twice the proxy action will be re-triggered by a redirect response; the third time, the proxy execution will end by going on REDIRECTION branch. The recurse feature can be disable by setting this parameter to 0 Default value of this parameter is 0. Example 1.9. Set proxy_recurse parameter ... modparam("cpl-c","proxy_recurse",2) ... 1.3.10. proxy_route (int) Before doing proxy (forward), a script route can be executed. All modifications made by that route will be reflected only for the current branch. Default value of this parameter is 0 (none). Example 1.10. Set proxy_route parameter ... modparam("cpl-c","proxy_route",1) ... 1.3.11. case_sensitive (int) Tells if the username matching should be perform case sensitive or not. Set it to a non zero value to force a case sensitive handling of usernames. Default value of this parameter is 0. Example 1.11. Set case_sensitive parameter ... modparam("cpl-c","case_sensitive",1) ... 1.3.12. realm_prefix (string) Defines a prefix for the domain part which should be ignored in handling users and scripts. Default value of this parameter is empty string. Example 1.12. Set realm_prefix parameter ... modparam("cpl-c","realm_prefix","sip.") ... 1.3.13. timer_avp (string) Full specification (ID, NAME, ALIAS) of the AVP to be used to set the value of the Final Response INVITE timeout - it's used by the TIMEOUT attribute from the PROXY tag. NOTE: take care and syncronize this value with the similar parameters in TM module. Default value of this parameter is NULL. Example 1.13. Set timer_avp parameter ... modparam("cpl-c","timer_avp","$avp(i:14)") ... 1.3.14. lookup_domain (string) Used by lookup tag to indicate where to perform user location. Basically this is the name of the usrloc domain (table) where the user registrations are kept. If set to empty string, the lookup node will be disabled - no user location will be performed. Default value of this parameter is NULL. Example 1.14. Set lookup_domain parameter ... modparam("cpl-c","lookup_domain","location") ... 1.3.15. lookup_append_branches (int) Tells if the lookup tag should append branches (to do parallel forking) if user_location lookup returns more than one contact. Set it to a non zero value to enable parallel forking for location lookup tag. Default value of this parameter is 0. Example 1.15. Set lookup_append_branches parameter ... modparam("cpl-c","lookup_append_branches",1) ... 1.3.16. use_domain (integer) Indicates if the domain part of the URI should be used in user identification (otherwise only username part will be used). Default value is "0 (disabled)". Example 1.16. Set use_domain parameter ... modparam("cpl-c","use_domain",1) ... 1.4. Exported Functions 1.4.1. cpl_run_script(type,mode) Starts the execution of the CPL script. The user name is fetched from new_uri or requested uri or from To header -in this order- (for incoming execution) or from FROM header (for outgoing execution). Regarding the stateful/stateless message processing, the function is very flexible, being able to run in different modes (see below the"mode" parameter). Normally this function will end script execution. There is no guaranty that the CPL script interpretation ended when Kamailio script ended also (for the same INVITE ;-)) - this can happen when the CPL script does a PROXY and the script interpretation pause after proxying and it will be resume when some reply is received (this can happen in a different process of SER). If the function returns to script, the SIP server should continue with the normal behavior as if no script existed. When some error is returned, the function itself haven't sent any SIP error reply (this can be done from script). Meaning of the parameters is as follows: * type - which part of the script should be run; set it to "incoming" for having the incoming part of script executed (when an INVITE is received) or to "outgoing" for running the outgoing part of script (when a user is generating an INVITE - call). * mode - sets the interpreter mode as stateless/stateful behavior. The following modes are accepted: + IS_STATELESS - the current INVITE has no transaction created yet. All replies (redirection or deny) will be done is a stateless way. The execution will switch to stateful only when proxy is done. So, if the function returns, will be in stateless mode. + IS_STATEFUL - the current INVITE has already a transaction associated. All signaling operations (replies or proxy) will be done in stateful way.So, if the function returns, will be in stateful mode. + FORCE_STATEFUL - the current INVITE has no transaction created yet. All signaling operations will be done is a stateful way (on signaling, the transaction will be created from within the interpreter). So, if the function returns, will be in stateless mode. HINT: is_stateful is very difficult to manage from the routing script (script processing can continue in stateful mode); is_stateless is the fastest and less resources consumer (transaction is created only if proxying is done), but there is minimal protection against retransmissions (since replies are send stateless); force_stateful is a good compromise - all signaling is done stateful (retransmission protection) and in the same time, if returning to script, it will be in stateless mode (easy to continue the routing script execution) This function can be used from REQUEST_ROUTE. Example 1.17. cpl_run_script usage ... cpl_run_script("incoming","force_stateful"); ... 1.4.2. cpl_process_register() This function MUST be called only for REGISTER requests. It checks if the current REGISTER request is related or not with CPL script upload/download/ remove. If it is, all the needed operation will be done. For checking if the REGISTER is CPL related, the function looks fist to "Content-Type" header. If it exists and has a the mime type set to "application/cpl+xml" means this is a CPL script upload/remove operation. The distinction between to case is made by looking at "Content-Disposition" header; id its value is "script;action=store", means it's an upload; if it's "script;action=remove", means it's a remove operation; other values are considered to be errors. If no "Content-Type" header is present, the function looks to "Accept" header and if it contains the "*" or "application/cpl-xml" the request it will be consider one for downloading CPL scripts. The functions returns to script only if the REGISTER is not related to CPL. In other case, the function will send by itself the necessary replies (stateless - using sl), including for errors. This function can be used from REQUEST_ROUTE. Example 1.18. cpl_process_register usage ... if (method=="REGISTER") { cpl_process_register(); } ... 1.4.3. cpl_process_register_norpl() Same as "cpl_process_register" without internally generating the reply. All information (script) is appended to the reply but without sending it out. Main purpose of this function is to allow integration between CPL and UserLocation services via same REGISTER messages. This function can be used from REQUEST_ROUTE. Example 1.19. cpl_process_register_norpl usage ... if (method=="REGISTER") { cpl_process_register(); # continue with usrloc part save("location"); } ... 1.5. Exported MI Functions 1.5.1. LOAD_CPL For the given user, loads the XML cpl file, compiles it into binary format and stores both format into database. Name: LOAD_CPL Parameters: * username : name of the user * cpl_filename: file name MI FIFO Command format: :LOAD_CPL:_reply_fifo_file_ username cpl_filename _empty_line_ 1.5.2. REMOVE_CPL For the given user, removes the entire database record (XML cpl and binary cpl); user with empty cpl scripts are not accepted. Name: REMOVE_CPL Parameters: * username : name of the user MI FIFO Command format: :REMOVE_CPL:_reply_fifo_file_ username _empty_line_ 1.5.3. GET_CPL For the given user, returns the CPL script in XML format. Name: GET_CPL Parameters: * username : name of the user MI FIFO Command format: :GET_CPL:_reply_fifo_file_ username _empty_line_ 1.6. Installation and Running 1.6.1. Database setup Before running Kamailio with cpl-c, you have to setup the database table where the module will store the CPL scripts. For that, if the table was not created by the installation script or you choose to install everything by yourself you can use the cpc-create.sql SQL script in the database directories in the kamailio/scripts folder as template. Database and table name can be set with module parameters so they can be changed, but the name of the columns must be as they are in the SQL script. You can also find the complete database documentation on the project webpage,