Just to complete the story - the cause was a coding error. I had only partially registered the plugin.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Paul Offord Sent: 14 April 2017 21:27 To: Developer support list for Wireshark <[email protected]> Subject: Re: [Wireshark-dev] Debugging an assertion failure Thanks to all for the suggestions. The assertion fails because the module name being passed is (none) and obviously the parenthesis are a problem. I think I know what's causing this and I'll investigate tomorrow. I eventually settled on Graham's suggestion to catch it and changed the code to: for (p = name; (c = *p) != '\0'; p++) { if (g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' || c == '-' || c == '.') { int dummy = 0; // breakpoint here. } else { int dummy2 = 0; } g_assert(g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' || c == '-' || c == '.'); } And then set a break point on the dummy2 line. Best regards...Paul -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Guy Harris Sent: 14 April 2017 20:46 To: Developer support list for Wireshark <[email protected]> Subject: Re: [Wireshark-dev] Debugging an assertion failure On Apr 14, 2017, at 12:41 PM, Guy Harris <[email protected]> wrote: > On Apr 14, 2017, at 3:41 AM, Paul Offord <[email protected]> wrote: > >> I need some advice. I’m debugging a problem with a dissector I’ve written. >> Tshark fails with: >> … \epan\prefs.c:414:prefs_register_module_or_subtree: assertion >> failed: (g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' || c == >> '-' || c == '.') > > Your dissector probably has, in its "filter name", a character that is not > any of 'a'-'z', '_', '-', or '.'. No, that's "your *protocol* probably has...", but the code to register a protocol should already be catching that and failing. So perhaps you're directly calling prefs_register_module() and passing it a module name containing a character that's not one of those. Don't do that in a dissector - call prefs_register_protocol(), which uses the protocol's filter name as the preferences module name. ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <[email protected]> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:[email protected]?subject=unsubscribe ______________________________________________________________________ This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. 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