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/*
Unix SMB/CIFS implementation.
Samba debug functions
Copyright (C) Andrew Tridgell 2003
Copyright (C) James J Myers 2003
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "system/filesys.h"
#include "system/time.h"
#include "dynconfig.h"
/**
* @file
* @brief Debug logging
**/
/**
* this global variable determines what messages are printed
*/
_PUBLIC_ int DEBUGLEVEL;
/* the registered mutex handlers */
static struct {
const char *name;
struct debug_ops ops;
} debug_handlers;
/* state variables for the debug system */
static struct {
int fd;
enum debug_logtype logtype;
const char *prog_name;
} state;
static BOOL reopen_logs_scheduled;
static BOOL check_reopen_logs(void)
{
if (state.fd == 0 || reopen_logs_scheduled) {
reopen_logs_scheduled = False;
reopen_logs();
}
if (state.fd <= 0) return False;
return True;
}
_PUBLIC_ void debug_schedule_reopen_logs(void)
{
reopen_logs_scheduled = True;
}
static void log_timestring(int level, const char *location, const char *func)
{
char *t = NULL;
char *s = NULL;
if (!check_reopen_logs()) return;
if (state.logtype != DEBUG_FILE) return;
t = timestring(NULL, time(NULL));
if (!t) return;
asprintf(&s, "[%s, %d %s:%s()]\n", t, level, location, func);
talloc_free(t);
if (!s) return;
write(state.fd, s, strlen(s));
free(s);
}
/**
the backend for debug messages. Note that the DEBUG() macro has already
ensured that the log level has been met before this is called
*/
_PUBLIC_ void do_debug_header(int level, const char *location, const char *func)
{
log_timestring(level, location, func);
log_task_id();
}
/**
the backend for debug messages. Note that the DEBUG() macro has already
ensured that the log level has been met before this is called
@note You should never have to call this function directly. Call the DEBUG()
macro instead.
*/
_PUBLIC_ void do_debug(const char *format, ...) _PRINTF_ATTRIBUTE(1,2)
{
va_list ap;
char *s = NULL;
if (!check_reopen_logs()) return;
va_start(ap, format);
vasprintf(&s, format, ap);
va_end(ap);
write(state.fd, s, strlen(s));
free(s);
}
_PUBLIC_ const char *logfile = NULL;
/**
reopen the log file (usually called because the log file name might have changed)
*/
_PUBLIC_ void reopen_logs(void)
{
char *fname = NULL;
int old_fd = state.fd;
switch (state.logtype) {
case DEBUG_STDOUT:
state.fd = 1;
break;
case DEBUG_STDERR:
state.fd = 2;
break;
case DEBUG_FILE:
if ((*logfile) == '/') {
fname = strdup(logfile);
} else {
asprintf(&fname, "%s/%s.log", dyn_LOGFILEBASE, state.prog_name);
}
if (fname) {
int newfd = open(fname, O_CREAT|O_APPEND|O_WRONLY, 0600);
if (newfd == -1) {
DEBUG(1, ("Failed to open new logfile: %s\n", fname));
old_fd = -1;
} else {
state.fd = newfd;
}
free(fname);
} else {
DEBUG(1, ("Failed to find name for file-based logfile!\n"));
}
break;
}
if (old_fd > 2) {
close(old_fd);
}
}
/**
control the name of the logfile and whether logging will be to stdout, stderr
or a file
*/
_PUBLIC_ void setup_logging(const char *prog_name, enum debug_logtype new_logtype)
{
if (state.logtype < new_logtype) {
state.logtype = new_logtype;
}
if (prog_name) {
state.prog_name = prog_name;
}
reopen_logs();
}
/**
return a string constant containing n tabs
no more than 10 tabs are returned
*/
_PUBLIC_ const char *do_debug_tab(uint_t n)
{
const char *tabs[] = {"", "\t", "\t\t", "\t\t\t", "\t\t\t\t", "\t\t\t\t\t",
"\t\t\t\t\t\t", "\t\t\t\t\t\t\t", "\t\t\t\t\t\t\t\t",
"\t\t\t\t\t\t\t\t\t", "\t\t\t\t\t\t\t\t\t\t"};
return tabs[MIN(n, 10)];
}
/**
log suspicious usage - print comments and backtrace
*/
_PUBLIC_ void log_suspicious_usage(const char *from, const char *info)
{
if (!debug_handlers.ops.log_suspicious_usage) return;
debug_handlers.ops.log_suspicious_usage(from, info);
}
/**
print suspicious usage - print comments and backtrace
*/
_PUBLIC_ void print_suspicious_usage(const char* from, const char* info)
{
if (!debug_handlers.ops.print_suspicious_usage) return;
debug_handlers.ops.print_suspicious_usage(from, info);
}
_PUBLIC_ uint32_t get_task_id(void)
{
if (debug_handlers.ops.get_task_id) {
return debug_handlers.ops.get_task_id();
}
return getpid();
}
_PUBLIC_ void log_task_id(void)
{
if (!debug_handlers.ops.log_task_id) return;
if (!check_reopen_logs()) return;
debug_handlers.ops.log_task_id(state.fd);
}
/**
register a set of debug handlers.
*/
_PUBLIC_ void register_debug_handlers(const char *name, struct debug_ops *ops)
{
debug_handlers.name = name;
debug_handlers.ops = *ops;
}
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