[Dovecot] writing a dovecot plugin / segfault
Hi together,
I am new to this list and new to dovecot itself. I have to write a plugin that implements some ACL-voodoo to be used instead of the standard ACL stuff of dovecot (it shall allow just application-driven folder-sharing - no more, no less).
Though I started programming with C, my last experiences are some days old, but now I have written the function sekeletons and the registration function with the 'register-command"-calls etc. The makefile-stuff I copied from the imap-quota-plugin and modified it, so all appearances of "lib11_imap_quota_plugin..." and similar are now found as "lib11_folderacl_plugin..." and so on.
In short words: I think I have done all nessessary mods to the source (I tried it some days ago with a slightly older version of dovecot, and until I did some unknown thing, it worked quite well...) to make the whole thing work.
One example function is (just testing at the moment): /* MYRIGHTS <folder>: retreive the rights of the current folder */ static bool cmd_myrights(struct client_command_context *cmd) { struct mail_storage *storage; struct mailbox *folder; const char *folder_name; string_t *response;
/* read argument: <folder> */
if (!client_read_string_args(cmd, 1, &folder_name))
return FALSE;
/* work done from here... */
/* for the moment, do a dummy response */
str_append(response, "* MYRIGHTS ");
str_append(response, folder_name);
str_append(response, " lrswipcda");
client_send_line(cmd->client, str_c(response));
client_send_tagline(cmd, "OK Completed.");
return TRUE;} But when testing via "telnet localhost 143" and doing a "20 myrights INBOX" the imap thread just crashes and does not give any answer. in /var/log/messages I only find something like the following entry: Jan 5 13:40:12 kungfu kernel: imap[8991]: segfault at 4 ip 080d5c67 sp bf82b040 error 4 in imap[8048000+b8000]
Maybe somebody can tell me, what this is? If needed, I also post the complete code itself somewhere.
Thanks in advance. Stefan
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Hi again,
sorry for asking my last stupid programming question, but I think, that was a kind of "programmer's blindness"... ;-)
I did not see, that I have forgotten to assign the function call t_new_str(256) to the variable "*response" - that's all.
Best regards Stefan
On Mon, Jan 05, 2009 at 02:20:39PM +0100, Stefan Jurisch wrote:
Hi together,
I am new to this list and new to dovecot itself. I have to write a plugin that implements some ACL-voodoo to be used instead of the standard ACL stuff of dovecot (it shall allow just application-driven folder-sharing - no more, no less).
Though I started programming with C, my last experiences are some days old, but now I have written the function sekeletons and the registration function with the 'register-command"-calls etc. [...]
--
SIEGNETZ.IT GmbH { w3o-services } Schneppenkauten 1a D-57076 Siegen
Tel.: 0271 68193-0 Fax: 0271 68193-29
Geschäftsführer: Oliver Seitz
Handelsregister-Nummer: HRB4838 Registergericht: Amtsgericht Siegen
Das Wort “WINDOWS” stammt aus einem alten Sioux-Dialekt und bedeutet: “Weißer Mann starrt durch Glasscheibe auf Sanduhr.”
-- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
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Stefan Jurisch