extra.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#include "pop3d.h"
#include "mailutils/libargp.h"
mu_stream_t iostream;
void
pop3d_parse_command (char *cmd, char **pcmd, char **parg)
{
char *p;
cmd = mu_str_skip_class (cmd, MU_CTYPE_BLANK);
*pcmd = cmd;
p = mu_str_skip_class_comp (cmd, MU_CTYPE_SPACE);
*p++ = 0;
if (*p)
{
*parg = p;
mu_rtrim_class (p, MU_CTYPE_SPACE);
}
else
*parg = "";
}
/* This is called if GNU POP3 needs to quit without going to the UPDATE stage.
This is used for conditions such as out of memory, a broken socket, or
being killed on a signal */
int
pop3d_abquit (int reason)
{
int code;
/* Unlock spool */
if (state != AUTHORIZATION)
{
pop3d_unlock ();
mu_mailbox_flush (mbox, 0);
mu_mailbox_close (mbox);
mu_mailbox_destroy (&mbox);
}
switch (reason)
{
case ERR_NO_MEM:
code = EX_SOFTWARE;
pop3d_outf ("-ERR %s\n", pop3d_error_string (reason));
mu_diag_output (MU_DIAG_ERROR, _("not enough memory"));
break;
case ERR_SIGNAL:
code = EX_SOFTWARE;
mu_diag_output (MU_DIAG_ERROR, _("quitting on signal"));
break;
case ERR_TERMINATE:
code = EX_OK;
mu_diag_output (MU_DIAG_NOTICE, _("terminating on request"));
break;
case ERR_TIMEOUT:
code = EX_TEMPFAIL;
pop3d_outf ("-ERR %s\n", pop3d_error_string (reason));
if (state == TRANSACTION)
mu_diag_output (MU_DIAG_INFO, _("session timed out for user: %s"),
username);
else
mu_diag_output (MU_DIAG_INFO, _("session timed out for no user"));
break;
case ERR_NO_IFILE:
code = EX_NOINPUT;
mu_diag_output (MU_DIAG_INFO, _("no input stream"));
break;
case ERR_NO_OFILE:
code = EX_IOERR;
mu_diag_output (MU_DIAG_INFO, _("no socket to send to"));
break;
case ERR_PROTO:
code = EX_PROTOCOL;
mu_diag_output (MU_DIAG_INFO, _("remote protocol error"));
break;
case ERR_IO:
code = EX_IOERR;
mu_diag_output (MU_DIAG_INFO, _("I/O error"));
break;
case ERR_MBOX_SYNC:
code = EX_OSERR; /* FIXME: This could be EX_SOFTWARE as well? */
mu_diag_output (MU_DIAG_ERROR,
_("mailbox was updated by other party: %s"),
username);
pop3d_outf
("-ERR [OUT-SYNC] Mailbox updated by other party or corrupt\n");
break;
default:
code = EX_SOFTWARE;
pop3d_outf ("-ERR Quitting: %s\n", pop3d_error_string (reason));
mu_diag_output (MU_DIAG_ERROR, _("quitting (numeric reason %d)"),
reason);
break;
}
closelog ();
exit (code);
}
void
pop3d_setio (int ifd, int ofd)
{
mu_stream_t str, istream, ostream;
if (ifd == -1)
pop3d_abquit (ERR_NO_IFILE);
if (ofd == -1)
pop3d_abquit (ERR_NO_OFILE);
if (mu_stdio_stream_create (&istream, ifd,
MU_STREAM_READ | MU_STREAM_AUTOCLOSE))
pop3d_abquit (ERR_NO_IFILE);
mu_stream_set_buffer (istream, mu_buffer_line, 0);
if (mu_stdio_stream_create (&ostream, ofd,
MU_STREAM_WRITE | MU_STREAM_AUTOCLOSE))
pop3d_abquit (ERR_NO_OFILE);
/* Combine the two streams into an I/O one. */
if (mu_iostream_create (&str, istream, ostream))
pop3d_abquit (ERR_FILE);
/* Convert all writes to CRLF form.
There is no need to convert reads, as the code ignores extra \r anyway.
*/
if (mu_filter_create (&iostream, str, "CRLF", MU_FILTER_ENCODE,
MU_STREAM_WRITE | MU_STREAM_RDTHRU))
pop3d_abquit (ERR_NO_IFILE);
/* Change buffering scheme: filter streams are fully buffered by default. */
mu_stream_set_buffer (iostream, mu_buffer_line, 0);
if (pop3d_transcript)
{
int rc;
mu_debug_t debug;
mu_stream_t dstr, xstr;
mu_diag_get_debug (&debug);
rc = mu_dbgstream_create (&dstr, debug, MU_DIAG_DEBUG, 0);
if (rc)
mu_error (_("cannot create debug stream; transcript disabled: %s"),
mu_strerror (rc));
else
{
rc = mu_xscript_stream_create (&xstr, iostream, dstr, NULL);
if (rc)
mu_error (_("cannot create transcript stream: %s"),
mu_strerror (rc));
else
{
mu_stream_unref (iostream);
iostream = xstr;
}
}
}
}
#ifdef WITH_TLS
int
pop3d_init_tls_server ()
{
mu_stream_t tlsstream, stream[2];
int rc;
stream[0] = stream[1] = NULL;
rc = mu_stream_ioctl (iostream, MU_IOCTL_SWAP_STREAM, stream);
if (rc)
{
mu_error (_("%s failed: %s"), "MU_IOCTL_SWAP_STREAM",
mu_stream_strerror (iostream, rc));
return 1;
}
rc = mu_tls_server_stream_create (&tlsstream, stream[0], stream[1], 0);
if (rc)
return 1;
rc = mu_stream_open (tlsstream);
if (rc)
{
mu_diag_output (MU_DIAG_ERROR, _("cannot open TLS stream: %s"),
mu_stream_strerror (tlsstream, rc));
mu_stream_destroy (&tlsstream);
return 1;
}
else
stream[0] = stream[1] = tlsstream;
rc = mu_stream_ioctl (iostream, MU_IOCTL_SWAP_STREAM, stream);
if (rc)
{
mu_error (_("%s failed: %s"), "MU_IOCTL_SWAP_STREAM",
mu_stream_strerror (iostream, rc));
pop3d_abquit (ERR_IO);
}
return 0;
}
#endif
void
pop3d_bye ()
{
mu_stream_close (iostream);
mu_stream_destroy (&iostream);
#ifdef WITH_TLS
if (tls_available)
mu_deinit_tls_libs ();
#endif /* WITH_TLS */
}
void
pop3d_flush_output ()
{
mu_stream_flush (iostream);
}
int
pop3d_is_master ()
{
return iostream == NULL;
}
void
pop3d_outf (const char *fmt, ...)
{
va_list ap;
int rc;
va_start (ap, fmt);
rc = mu_stream_vprintf (iostream, fmt, ap);
va_end (ap);
if (rc)
{
mu_diag_output (MU_DIAG_ERROR, _("Write failed: %s"),
mu_stream_strerror (iostream, rc));
pop3d_abquit (ERR_IO);
}
}
/* Gets a line of input from the client, caller should free() */
char *
pop3d_readline (char *buffer, size_t size)
{
int rc;
size_t nbytes;
alarm (idle_timeout);
rc = mu_stream_readline (iostream, buffer, size, &nbytes);
alarm (0);
if (rc)
{
mu_diag_output (MU_DIAG_ERROR, _("Read failed: %s"),
mu_stream_strerror (iostream, rc));
pop3d_abquit (ERR_IO);
}
else if (nbytes == 0)
{
/* After a failed authorization attempt many clients simply disconnect
without issuing QUIT. We do not count this as a protocol error. */
if (state == AUTHORIZATION)
exit (EX_OK);
mu_diag_output (MU_DIAG_ERROR, _("Unexpected eof on input"));
pop3d_abquit (ERR_PROTO);
}
return buffer;
}
/* Handling of the deletion marks */
void
pop3d_mark_deleted (mu_attribute_t attr)
{
mu_attribute_set_userflag (attr, POP3_ATTRIBUTE_DELE);
}
int
pop3d_is_deleted (mu_attribute_t attr)
{
return mu_attribute_is_deleted (attr)
|| mu_attribute_is_userflag (attr, POP3_ATTRIBUTE_DELE);
}
void
pop3d_unset_deleted (mu_attribute_t attr)
{
if (mu_attribute_is_userflag (attr, POP3_ATTRIBUTE_DELE))
mu_attribute_unset_userflag (attr, POP3_ATTRIBUTE_DELE);
}
void
pop3d_undelete_all ()
{
size_t i;
size_t total = 0;
mu_mailbox_messages_count (mbox, &total);
for (i = 1; i <= total; i++)
{
mu_message_t msg = NULL;
mu_attribute_t attr = NULL;
mu_mailbox_get_message (mbox, i, &msg);
mu_message_get_attribute (msg, &attr);
mu_attribute_unset_deleted (attr);
}
}
int
set_xscript_level (int xlev)
{
if (pop3d_transcript)
{
if (xlev != MU_XSCRIPT_NORMAL)
{
mu_log_level_t n = xlev == MU_XSCRIPT_SECURE ?
MU_DEBUG_TRACE6 : MU_DEBUG_TRACE7;
if (mu_global_debug_level ("pop3") & MU_DEBUG_LEVEL_MASK (n))
return MU_XSCRIPT_NORMAL;
}
if (mu_stream_ioctl (iostream, MU_IOCTL_LEVEL, &xlev) == 0)
return xlev;
}
return 0;
}