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[2002-02-18 04:23 UTC] charlesb at ekit-inc dot com
The starting point for this was that our webmail (customised IMP)would crash if the "To" header was too large. Probably the header violates rfc822, but php should be able to cope, or at least fail gracefully and not hang. We are running php built with the imap4.5 uwash c-client, with ldap, with mysql. Apache is built with mods rewrite, mime_magic, the lastest fastcgi, the latest modssl. The fastcgi connection is used for most pages rendered from our site. Playing around with truss led us to suspect mime_header_decode was at fault, ie: php_if_imap_mime_header_decode+0x6d3: movl (%ebx),%edx Now, in getting a gdb backtrace, things got very wierd. Below is the output - but it occurs not only when we try to read the email with the oversized to header, but when I try to do something mundane like parse the whole mailbox. So maybe there are two problems, needless to say - I hope the truss line is useful, because I wouldn't rely on the gdb backtrace. Thanks. Program received signal SIGPIPE, Broken pipe. 0xdfee1f3b in _writev () (gdb) bt #0 0xdfee1f3b in _writev () #1 0x80b2254 in ssl_io_unregister () #2 0x81ba5f4 in ap_hook_call () #3 0x81b9d41 in ap_hook_call () #4 0x8196641 in ap_bfilbuf () #5 0x8196a6c in ap_bfilbuf () #6 0x8196b38 in ap_bwrite () #7 0x816537e in php_mergesort () #8 0x8166ec5 in php_mergesort () #9 0x816749d in php_mergesort () #10 0x8197ddb in ap_invoke_handler () #11 0x81ac451 in ap_some_auth_required () #12 0x81ac4b0 in ap_process_request () #13 0x81a3ad1 in ap_child_terminate () #14 0x81a3c80 in ap_child_terminate () #15 0x81a3ddb in ap_child_terminate () #16 0x81a43d8 in ap_child_terminate () #17 0x81a4b9b in main () #18 0x809b947 in _start () PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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An exact script is difficult. (I've spent a day or two trying to pin it down to a simple routine, not with any great success). However, it looks like $h = @imap_header($imp->stream, imap_msgno($imp->stream, $msgnum)); is hanging with a message that has to header of about 4K (again, this probably violates rfc822, but it shouldn't hang like it does). $imp->stream is constructed like this (as you'd expect): $connstr = '{' . $this->server . ':' . $this->port . '}' . $this->mailbox; $this->stream = @imap_open($connstr, $this->user, $this->pass); Thanks.