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/* $Id: log.c,v 1.29 2004-08-14 03:20:01 rjkaes Exp $
*
* Logs the various messages which tinyproxy produces to either a log file or
* the syslog daemon. Not much to it...
*
* Copyright (C) 1998 Steven Young
* Copyright (C) 1999 Robert James Kaes (rjkaes@flarenet.com)
*
* 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, 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.
*/
#include "tinyproxy.h"
#include "heap.h"
#include "log.h"
#include "utils.h"
#include "vector.h"
static 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, 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)
return;
}
vsnprintf(str, STRING_LENGTH, fmt, args);
entry_buffer = safemalloc(strlen(str) + 6);
if (!entry_buffer)
return;
sprintf(entry_buffer, "%d %s", level, str);
vector_append(log_message_storage, entry_buffer,
strlen(entry_buffer) + 1);
va_end(args);
return;
}
#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
va_end(args);
}
/*
* This needs to send any stored log messages.
*/
void
send_stored_logs(void)
{
char *string;
char *ptr;
int level;
int 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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