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312 lines (259 loc) · 8.54 KB
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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>
* Copyright (C) 2009 Michael Adam <obnox@samba.org>
*
* 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"
#include "conf.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;
static unsigned int logging_initialized = FALSE; /* boolean */
/*
* Open the log file and store the file descriptor in a global location.
*/
int open_log_file (const char *log_file_name)
{
if (log_file_name == NULL) {
if(config.godaemon == FALSE)
log_file_fd = fileno(stdout);
else
log_file_fd = -1;
} else {
log_file_fd = create_file_safely (log_file_name, FALSE);
}
return log_file_fd;
}
/*
* Close the log file
*/
void close_log_file (void)
{
if (log_file_fd < 0 || log_file_fd == fileno(stdout)) {
return;
}
close (log_file_fd);
log_file_fd = -1;
}
/*
* 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];
ssize_t ret;
if(!config.syslog && log_file_fd == -1)
return;
#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
if (config.syslog && level == LOG_CONN)
level = LOG_INFO;
va_start (args, fmt);
/*
* If the config file hasn't been processed, then we need to store
* the messages for later processing.
*/
if (!logging_initialized) {
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 = (char *) 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;
}
if (config.syslog) {
#ifdef HAVE_VSYSLOG_H
vsyslog (level, fmt, args);
#else
vsnprintf (str, STRING_LENGTH, fmt, args);
syslog (level, "%s", str);
#endif
} else {
char *p;
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 ());
/*
* Overwrite the '\0' and leave room for a trailing '\n'
* be added next.
*/
p = str + strlen(str);
vsnprintf (p, STRING_LENGTH - strlen(str) - 1, fmt, args);
p = str + strlen(str);
*p = '\n';
*(p+1) = '\0';
assert (log_file_fd >= 0);
ret = write (log_file_fd, str, strlen (str));
if (ret == -1) {
config.syslog = TRUE;
log_message(LOG_CRIT, "ERROR: Could not write to log "
"file %s: %s.",
config.logf_name, strerror(errno));
log_message(LOG_CRIT,
"Falling back to syslog logging");
}
fsync (log_file_fd);
}
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;
if (log_message_storage == NULL)
return;
log_message(LOG_DEBUG, "sending stored logs");
for (i = 0; (ssize_t) i != vector_length (log_message_storage); ++i) {
string =
(char *) 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, "%s", ptr);
}
vector_delete (log_message_storage);
log_message_storage = NULL;
log_message(LOG_DEBUG, "done sending stored logs");
}
/**
* Initialize the logging subsystem, based on the configuration.
* Returns 0 upon success, -1 upon failure.
*
* This function uses fprintf() instead of log_message(), since
* the logging is not yet set up...
*/
int setup_logging (void)
{
if (!config.syslog) {
if (open_log_file (config.logf_name) < 0) {
/*
* If opening the log file fails, we try
* to fall back to syslog logging...
*/
config.syslog = TRUE;
log_message (LOG_CRIT, "ERROR: Could not create log "
"file %s: %s.",
config.logf_name, strerror (errno));
log_message (LOG_CRIT,
"Falling back to syslog logging.");
}
}
if (config.syslog) {
if (config.godaemon == TRUE)
openlog ("tinyproxy", LOG_PID, LOG_DAEMON);
else
openlog ("tinyproxy", LOG_PID, LOG_USER);
}
logging_initialized = TRUE;
send_stored_logs ();
return 0;
}
/**
* Stop the logging subsystem.
*/
void shutdown_logging (void)
{
if (!logging_initialized) {
return;
}
if (config.syslog) {
closelog ();
} else {
close_log_file ();
}
logging_initialized = FALSE;
}
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