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/* tinyproxy - A fast light-weight HTTP proxy
* Copyright (C) 1998 Steven Young <sdyoung@miranda.org>
* Copyright (C) 1999 Robert James Kaes <rjkaes@users.sourceforge.net>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Logs the various messages which tinyproxy produces to either a log file
* or the syslog daemon. Not much to it...
*/
#include "main.h"
#include "heap.h"
#include "log.h"
#include "utils.h"
#include "vector.h"
static const char *syslog_level[] = {
NULL,
NULL,
"CRITICAL",
"ERROR",
"WARNING",
"NOTICE",
"INFO",
"DEBUG",
"CONNECT"
};
#define TIME_LENGTH 16
#define STRING_LENGTH 800
/*
* Global file descriptor for the log file
*/
int log_file_fd = -1;
/*
* Store the log level setting.
*/
static int log_level = LOG_INFO;
/*
* Hold a listing of log messages which need to be sent once the log
* file has been established.
* The key is the actual messages (already filled in full), and the value
* is the log level.
*/
static vector_t log_message_storage;
/*
* Open the log file and store the file descriptor in a global location.
*/
int
open_log_file (const char *log_file_name)
{
log_file_fd = create_file_safely (log_file_name, FALSE);
return log_file_fd;
}
/*
* Close the log file
*/
void
close_log_file (void)
{
close (log_file_fd);
}
/*
* Truncate log file to a zero length.
*/
void
truncate_log_file (void)
{
lseek (log_file_fd, 0, SEEK_SET);
ftruncate (log_file_fd, 0);
}
/*
* Set the log level for writing to the log file.
*/
void
set_log_level (int level)
{
log_level = level;
}
/*
* This routine logs messages to either the log file or the syslog function.
*/
void
log_message (int level, const char *fmt, ...)
{
va_list args;
time_t nowtime;
char time_string[TIME_LENGTH];
char str[STRING_LENGTH];
#ifdef NDEBUG
/*
* Figure out if we should write the message or not.
*/
if (log_level == LOG_CONN)
{
if (level == LOG_INFO)
return;
}
else if (log_level == LOG_INFO)
{
if (level > LOG_INFO && level != LOG_CONN)
return;
}
else if (level > log_level)
return;
#endif
#ifdef HAVE_SYSLOG_H
if (config.syslog && level == LOG_CONN)
level = LOG_INFO;
#endif
va_start (args, fmt);
/*
* If the config file hasn't been processed, then we need to store
* the messages for later processing.
*/
if (!processed_config_file)
{
char *entry_buffer;
if (!log_message_storage)
{
log_message_storage = vector_create ();
if (!log_message_storage)
goto out;
}
vsnprintf (str, STRING_LENGTH, fmt, args);
entry_buffer = safemalloc (strlen (str) + 6);
if (!entry_buffer)
goto out;
sprintf (entry_buffer, "%d %s", level, str);
vector_append (log_message_storage, entry_buffer,
strlen (entry_buffer) + 1);
safefree (entry_buffer);
goto out;
}
#ifdef HAVE_SYSLOG_H
if (config.syslog)
{
# ifdef HAVE_VSYSLOG_H
vsyslog (level, fmt, args);
# else
vsnprintf (str, STRING_LENGTH, fmt, args);
syslog (level, "%s", str);
# endif
}
else
{
#endif
nowtime = time (NULL);
/* Format is month day hour:minute:second (24 time) */
strftime (time_string, TIME_LENGTH, "%b %d %H:%M:%S",
localtime (&nowtime));
snprintf (str, STRING_LENGTH, "%-9s %s [%ld]: ",
syslog_level[level], time_string, (long int) getpid ());
assert (log_file_fd >= 0);
write (log_file_fd, str, strlen (str));
vsnprintf (str, STRING_LENGTH, fmt, args);
write (log_file_fd, str, strlen (str));
write (log_file_fd, "\n", 1);
fsync (log_file_fd);
#ifdef HAVE_SYSLOG_H
}
#endif
out:
va_end (args);
}
/*
* This needs to send any stored log messages.
*/
void
send_stored_logs (void)
{
char *string;
char *ptr;
int level;
size_t i;
for (i = 0; i != vector_length (log_message_storage); ++i)
{
string = vector_getentry (log_message_storage, i, NULL);
ptr = strchr (string, ' ') + 1;
level = atoi (string);
#ifdef NDEBUG
if (log_level == LOG_CONN && level == LOG_INFO)
continue;
else if (log_level == LOG_INFO)
{
if (level > LOG_INFO && level != LOG_CONN)
continue;
}
else if (level > log_level)
continue;
#endif
log_message (level, ptr);
}
vector_delete (log_message_storage);
log_message_storage = NULL;
}
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