textops Module

Andrei Pelinescu-Onciul

   FhG FOKUS
   <pelinescu-onciul@fokus.fraunhofer.de>

Edited by

Andrei Pelinescu-Onciul

   <pelinescu-onciul@fokus.fraunhofer.de>

Edited by

Daniel-Constantin Mierla

   <miconda@gmail.com>

Edited by

Ovidiu Sas

   <osas@voipembedded.com>

   Copyright © 2003 FhG FOKUS
   Revision History
   Revision $Revision: 7480 $ $Date$
     __________________________________________________________

   Table of Contents

   1. Admin Guide

        1.1. Overview

              1.1.1. Known Limitations

        1.2. Dependencies

              1.2.1. OpenSIPS Modules
              1.2.2. External Libraries or Applications

        1.3. Exported Functions

              1.3.1. search(re)
              1.3.2. search_body(re)
              1.3.3. search_append(re, txt)
              1.3.4. search_append_body(re, txt)
              1.3.5. replace(re, txt)
              1.3.6. replace_body(re, txt)
              1.3.7. replace_all(re, txt)
              1.3.8. replace_body_all(re, txt)
              1.3.9. replace_body_atonce(re, txt)
              1.3.10. subst('/re/repl/flags')
              1.3.11. subst_uri('/re/repl/flags')
              1.3.12. subst_user('/re/repl/flags')
              1.3.13. subst_body('/re/repl/flags')

   List of Examples

   1.1. search usage
   1.2. search_body usage
   1.3. search_append usage
   1.4. search_append_body usage
   1.5. replace usage
   1.6. replace_body usage
   1.7. replace_all usage
   1.8. replace_body_all usage
   1.9. replace_body_atonce usage
   1.10. subst usage
   1.11. subst_uri usage
   1.12. subst usage
   1.13. subst_body usage

Chapter 1. Admin Guide

1.1. Overview

   The module implements text based operations over the SIP
   message processed by OpenSIPS. SIP is a text based protocol and
   the module provides a large set of very useful functions to
   manipulate the message at text level, e.g., regular expression
   search and replace, Perl-like substitutions, etc.

   Note: all SIP-aware functions like insert_hf, append_hf or
   codec operations have been moved to the sipmsgops module.

1.1.1. Known Limitations

   search ignores folded lines. For example,
   search(“(From|f):.*@foo.bar”) doesn't match the following From
   header field:
From: medabeda
 <sip:medameda@foo.bar>;tag=1234

1.2. Dependencies

1.2.1. OpenSIPS Modules

   The following modules must be loaded before this module:
     * No dependencies on other OpenSIPS modules.

1.2.2. External Libraries or Applications

   The following libraries or applications must be installed
   before running OpenSIPS with this module loaded:
     * None.

1.3. Exported Functions

1.3.1.  search(re)

   Searches for the re in the message.

   Meaning of the parameters is as follows:
     * re - Regular expression.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.1. search usage
...
if ( search("[Ss][Ii][Pp]") ) { /*....*/ };
...

1.3.2.  search_body(re)

   Searches for the re in the body of the message.

   Meaning of the parameters is as follows:
     * re - Regular expression.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.2. search_body usage
...
if ( search_body("[Ss][Ii][Pp]") ) { /*....*/ };
...

1.3.3.  search_append(re, txt)

   Searches for the first match of re and appends txt after it.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String to be appended.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.3. search_append usage
...
search_append("[Oo]pen[Ss]er", " SIP Proxy");
...

1.3.4.  search_append_body(re, txt)

   Searches for the first match of re in the body of the message
   and appends txt after it.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String to be appended.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.4. search_append_body usage
...
search_append_body("[Oo]pen[Ss]er", " SIP Proxy");
...

1.3.5.  replace(re, txt)

   Replaces the first occurrence of re with txt.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.5. replace usage
...
replace("opensips", "Open SIP Server");
...

1.3.6.  replace_body(re, txt)

   Replaces the first occurrence of re in the body of the message
   with txt.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.6. replace_body usage
...
replace_body("opensips", "Open SIP Server");
...

1.3.7.  replace_all(re, txt)

   Replaces all occurrence of re with txt.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.7. replace_all usage
...
replace_all("opensips", "Open SIP Server");
...

1.3.8.  replace_body_all(re, txt)

   Replaces all occurrence of re in the body of the message with
   txt. Matching is done on a per-line basis.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.8. replace_body_all usage
...
replace_body_all("opensips", "Open SIP Server");
...

1.3.9.  replace_body_atonce(re, txt)

   Replaces all occurrence of re in the body of the message with
   txt. Matching is done over the whole body.

   Meaning of the parameters is as follows:
     * re - Regular expression.
     * txt - String.

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.9. replace_body_atonce usage
...
# strip the whole body from the message:
if(has_body() && replace_body_atonce("^.+$", ""))
        remove_hf("Content-Type");
...

1.3.10.  subst('/re/repl/flags')

   Replaces re with repl (sed or perl like).

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can
       be a combination of i (case insensitive), g (global) or s
       (match newline don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain
       pseudo-variables
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.10. subst usage
...
# replace the uri in to: with the message uri (just an example)
if ( subst('/^To:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/t:\1\u\2/ig') ) {};

# replace the uri in to: with the value of avp sip_address (just an exam
ple)
if ( subst('/^To:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/t:\1$avp(sip_address)\
2/ig') ) {};

...

1.3.11.  subst_uri('/re/repl/flags')

   Runs the re substitution on the message uri (like subst but
   works only on the uri)

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can
       be a combination of i (case insensitive), g (global) or s
       (match newline don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain
       pseudo-variables
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.11. subst_uri usage
...
# adds 3463 prefix to numeric uris, and save the original uri (\0 match)
# as a parameter: orig_uri (just an example)
if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:3463\1@\2;orig_uri=\0/i')){$

# adds the avp 'uri_prefix' as prefix to numeric uris, and save the orig
inal
# uri (\0 match) as a parameter: orig_uri (just an example)
if (subst_uri('/^sip:([0-9]+)@(.*)$/sip:$avp(uri_prefix)\1@\2;orig_uri=\
0/i')){$

...

1.3.12.  subst_user('/re/repl/flags')

   Runs the re substitution on the message uri (like subst_uri but
   works only on the user portion of the uri)

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can
       be a combination of i (case insensitive), g (global) or s
       (match newline don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain
       pseudo-variables
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.12. subst usage
...
# adds 3463 prefix to uris ending with 3642 (just an example)
if (subst_user('/3642$/36423463/')){$

...
# adds avp 'user_prefix' as prefix to username in r-uri ending with 3642
if (subst_user('/(.*)3642$/$avp(user_prefix)\13642/')){$

...

1.3.13.  subst_body('/re/repl/flags')

   Replaces re with repl (sed or perl like) in the body of the
   message.

   Meaning of the parameters is as follows:
     * '/re/repl/flags' - sed like regular expression. flags can
       be a combination of i (case insensitive), g (global) or s
       (match newline don't treat it as end of line).
       're' - is regular expresion
       'repl' - is replacement string - may contain
       pseudo-variables
       'flags' - substitution flags (i - ignore case, g - global)

   This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE,
   FAILURE_ROUTE, BRANCH_ROUTE.

   Example 1.13. subst_body usage
...
if ( subst_body('/^o=(.*) /o=$fU ') ) {};

...
