extra.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001, 2002, 2003 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 2, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "pop3d.h"
static FILE *ifile;
static FILE *ofile;
#ifdef WITH_TLS
static gnutls_session sfile;
#endif /* WITH_TLS */
/* Takes a string as input and returns either the remainder of the string
after the first space, or a zero length string if no space */
char *
pop3d_args (const char *cmd)
{
int space = -1, i = 0, len;
char *buf;
len = strlen (cmd) + 1;
buf = malloc (len * sizeof (char));
if (buf == NULL)
pop3d_abquit (ERR_NO_MEM);
while (space < 0 && i < len)
{
if (cmd[i] == ' ')
space = i + 1;
else if (cmd[i] == '\0' || cmd[i] == '\r' || cmd[i] == '\n')
len = i;
i++;
}
if (space < 0)
buf[0] = '\0';
else
{
for (i = space; i < len; i++)
if (cmd[i] == '\0' || cmd[i] == '\r' || cmd[i] == '\n')
buf[i - space] = '\0';
else
buf[i - space] = cmd[i];
}
return buf;
}
/* This takes a string and returns the string up to the first space or end of
the string, whichever occurs first */
char *
pop3d_cmd (const char *cmd)
{
char *buf;
int i = 0, len;
len = strlen (cmd) + 1;
buf = malloc (len * sizeof (char));
if (buf == NULL)
pop3d_abquit (ERR_NO_MEM);
for (i = 0; i < len; i++)
{
if (cmd[i] == ' ' || cmd[i] == '\0' || cmd[i] == '\r' || cmd[i] == '\n')
len = i;
else
buf[i] = cmd[i];
}
buf[i - 1] = '\0';
return buf;
}
/* 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)
{
/* Unlock spool */
pop3d_unlock ();
mailbox_close (mbox);
mailbox_destroy (&mbox);
switch (reason)
{
case ERR_NO_MEM:
pop3d_outf ("-ERR Out of memory, quitting\r\n");
syslog (LOG_ERR, _("Out of memory"));
break;
case ERR_SIGNAL:
pop3d_outf ("-ERR Quitting on signal\r\n");
syslog (LOG_ERR, _("Quitting on signal"));
break;
case ERR_TIMEOUT:
pop3d_outf ("-ERR Session timed out\r\n");
if (state == TRANSACTION)
syslog (LOG_INFO, _("Session timed out for user: %s"), username);
else
syslog (LOG_INFO, _("Session timed out for no user"));
break;
case ERR_NO_OFILE:
syslog (LOG_INFO, _("No socket to send to"));
break;
case ERR_MBOX_SYNC:
syslog (LOG_ERR, _("Mailbox was updated by other party: %s"), username);
pop3d_outf
("-ERR [OUT-SYNC] Mailbox updated by other party or corrupt\r\n");
break;
default:
pop3d_outf ("-ERR Quitting (reason unknown)\r\n");
syslog (LOG_ERR, _("Unknown quit"));
break;
}
closelog ();
exit (EXIT_FAILURE);
}
void
pop3d_setio (FILE * in, FILE * out)
{
if (!in || !out)
pop3d_abquit (ERR_NO_OFILE);
ifile = in;
ofile = out;
}
#ifdef WITH_TLS
int
pop3d_init_tls_server ()
{
sfile =
(gnutls_session) mu_init_tls_server (fileno (ifile), fileno (ofile));
if (!sfile)
return 0;
return 1;
}
void
pop3d_deinit_tls_server ()
{
mu_deinit_tls_server (sfile);
}
#endif /* WITH_TLS */
void
pop3d_flush_output ()
{
fflush (ofile);
}
int
pop3d_is_master ()
{
return ofile == NULL;
}
void
pop3d_outf (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
if (daemon_param.transcript)
{
char *buf;
vasprintf (&buf, fmt, ap);
if (buf)
{
syslog (LOG_DEBUG, "sent: %s", buf);
free (buf);
}
}
#ifdef WITH_TLS
if (tls_done)
{
char *buf;
vasprintf (&buf, fmt, ap);
if (buf)
{
gnutls_record_send (sfile, buf, strlen (buf));
free (buf);
}
}
else
#endif /* WITH_TLS */
vfprintf (ofile, fmt, ap);
va_end (ap);
}
/* Gets a line of input from the client, caller should free() */
char *
pop3d_readline (char *buffer, size_t size)
{
char *ptr;
alarm (daemon_param.timeout);
#ifdef WITH_TLS
if (tls_done)
{
int rc = gnutls_record_recv (sfile, buffer, size - 1);
if (rc < 0)
{
syslog (LOG_ERR, _("TLS error on read: %s"),
gnutls_strerror (rc));
pop3d_abquit (ERR_TLS_IO);
}
else
buffer[rc] = 0;
ptr = buffer;
}
else
#endif /* WITH_TLS */
ptr = fgets (buffer, size, ifile);
alarm (0);
/* We should probably check ferror() too, but if ptr is null we
are done anyway; if (!ptr && ferror(ifile)) */
if (!ptr)
pop3d_abquit (ERR_NO_OFILE);
if (daemon_param.transcript)
syslog (LOG_DEBUG, "recv: %s", ptr);
/* Caller should not free () this ... should we strdup() then? */
return ptr;
}