sip_to_pjsip: improve ability to parse input files

General improvements to SIP to PJSIP conversion utility:

1) track default section of input file to allow parsing
   an include file that doesn't specify a [section]

2) informatively handle case of assignment without [section]

3) correctly handle getting sections from included files
   - [section]'s are inherited by included file

4) provide null string as default transport bind ip

5) gracefully handle missing portions of registration string

6) denote steps of operation during conversion and confirm
   top level files as a convenience

ASTERISK-24474 #close
Review: https://reviewboard.asterisk.org/r/4280/
Reported by: John Kiniston
........

Merged revisions 430469 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@430470 65c4cc65-6c06-0410-ace0-fbb531ad65f3

contrib/scripts/sip_to_pjsip/sip_to_pjsip.py

@@ -587,7 +587,11 @@ def create_udp(sip, pjsip, nmapped):
     externhost
     """
 
-    bind = sip.multi_get('general', ['udpbindaddr', 'bindaddr'])[0]
+    try:
+        bind = sip.multi_get('general', ['udpbindaddr', 'bindaddr'])[0]
+    except LookupError:
+        bind = ''
+
     bind = build_host(sip, bind, 'general', 'bindport')
 
     try:
@@ -974,11 +978,12 @@ class Registration:
 
         auth_section = 'auth_reg_' + self.host
 
-        if self.secret:
+        if hasattr(self, 'secret') and self.secret:
             set_value('password', self.secret, auth_section, pjsip, nmapped,
                       'auth')
-            set_value('username', self.authuser or self.user, auth_section,
-                      pjsip, nmapped, 'auth')
+            if hasattr(self, 'authuser'):
+                set_value('username', self.authuser or self.user, auth_section,
+                          pjsip, nmapped, 'auth')
             set_value('outbound_auth', auth_section, section, pjsip, nmapped,
                       'registration')
 
@@ -988,7 +993,7 @@ class Registration:
         else:
             client_uri += self.host
 
-        if self.domainport:
+        if hasattr(self, 'domainport') and self.domainport:
             client_uri += ":" + self.domainport
         elif self.port:
             client_uri += ":" + self.port
@@ -1136,8 +1141,9 @@ def cli_options():
     """
     global PREFIX
     usage = "usage: %prog [options] [input-file [output-file]]\n\n" \
-        "input-file defaults to 'sip.conf'\n" \
-        "output-file defaults to 'pjsip.conf'"
+		"Converts the chan_sip configuration input-file to the chan_pjsip output-file.\n"\
+        "The input-file defaults to 'sip.conf'.\n" \
+        "The output-file defaults to 'pjsip.conf'."
     parser = optparse.OptionParser(usage=usage)
     parser.add_option('-p', '--prefix', dest='prefix', default=PREFIX,
                       help='output prefix for include files')
@@ -1154,6 +1160,9 @@ if __name__ == "__main__":
     sip_filename, pjsip_filename = cli_options()
     # configuration parser for sip.conf
     sip = astconfigparser.MultiOrderedConfigParser()
+    print 'Reading', sip_filename
     sip.read(sip_filename)
+    print 'Converting to PJSIP...'
     pjsip, non_mappings = convert(sip, pjsip_filename, dict(), False)
+    print 'Writing', pjsip_filename
     write_pjsip(pjsip_filename, pjsip, non_mappings)