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-rw-r--r--lib/util/debug_s4.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/lib/util/debug_s4.c b/lib/util/debug_s4.c
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+++ b/lib/util/debug_s4.c
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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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "system/time.h"
+#include "dynconfig/dynconfig.h"
+
+/**
+ * @file
+ * @brief Debug logging
+ **/
+
+/**
+ * this global variable determines what messages are printed
+ */
+int _debug_level = 0;
+_PUBLIC_ int *debug_level = &_debug_level;
+static int debug_all_class_hack = 1;
+int *DEBUGLEVEL_CLASS = &debug_all_class_hack; /* For samba 3 */
+static bool debug_all_class_isset_hack = true;
+bool *DEBUGLEVEL_CLASS_ISSET = &debug_all_class_isset_hack; /* For samba 3 */
+
+/* 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; /* The log file handle */
+ enum debug_logtype logtype; /* The type of logging we are doing: eg stdout, file, stderr */
+ const char *prog_name;
+ bool reopening_logs;
+} 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 dbghdr(int level, const char *location, const char *func)
+{
+ log_timestring(level, location, func);
+ log_task_id();
+}
+
+
+_PUBLIC_ void dbghdrclass(int level, int dclass, const char *location, const char *func)
+{
+ /* Simple wrapper, Samba 4 doesn't do debug classes */
+ dbghdr(level, location, func);
+}
+
+/**
+ 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 dbgtext(const char *format, ...)
+{
+ va_list ap;
+
+ if (!check_reopen_logs()) return;
+
+ va_start(ap, format);
+ vdprintf(state.fd, format, ap);
+ va_end(ap);
+}
+
+_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;
+ if (state.reopening_logs) {
+ return;
+ }
+
+ switch (state.logtype) {
+ case DEBUG_STDOUT:
+ case DEBUG_DEFAULT_STDOUT:
+ state.fd = 1;
+ break;
+
+ case DEBUG_STDERR:
+ case DEBUG_DEFAULT_STDERR:
+ state.fd = 2;
+ break;
+
+ case DEBUG_FILE:
+ state.reopening_logs = true;
+ if (logfile && (*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"));
+ }
+ state.reopening_logs = false;
+
+ break;
+ }
+
+ if (old_fd > 2) {
+ close(old_fd);
+ }
+}
+
+/* setup for logging of talloc warnings */
+static void talloc_log_fn(const char *msg)
+{
+ DEBUG(0,("%s", msg));
+}
+
+void debug_setup_talloc_log(void)
+{
+ talloc_set_log_fn(talloc_log_fn);
+}
+
+/**
+ control the name of the logfile and whether logging will be to stdout, stderr
+ or a file, and set up syslog
+
+ new_log indicates the destination for the debug log (an enum in
+ order of precedence - once set to DEBUG_FILE, it is not possible to
+ reset to DEBUG_STDOUT for example. This makes it easy to override
+ for debug to stderr on the command line, as the smb.conf cannot
+ reset it back to file-based logging
+*/
+_PUBLIC_ void setup_logging(const char *prog_name, enum debug_logtype new_logtype)
+{
+ debug_setup_talloc_log();
+ 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(int 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;
+}