lib/util/debug.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba debug functions
   4    Copyright (C) Andrew Tridgell 2003
   5    Copyright (C) James J Myers   2003
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/filesys.h"
  23 #include "system/time.h"
  24 #include "dynconfig/dynconfig.h"
  25
  26 /**
  27  * @file
  28  * @brief Debug logging
  29  **/
  30
  31 /**
  32  * this global variable determines what messages are printed
  33  */
  34 int _debug_level = 0;
  35 _PUBLIC_ int *debug_level = &_debug_level;
  36 static int debug_all_class_hack = 1;
  37 int *DEBUGLEVEL_CLASS = &debug_all_class_hack; /* For samba 3 */
  38 static bool debug_all_class_isset_hack = true;
  39 bool    *DEBUGLEVEL_CLASS_ISSET = &debug_all_class_isset_hack; /* For samba 3 */
  40 XFILE *dbf = NULL; /* For Samba 3*/
  41
  42 /* the registered mutex handlers */
  43 static struct {
  44         const char *name;
  45         struct debug_ops ops;
  46 } debug_handlers;
  47
  48 /* state variables for the debug system */
  49 static struct {
  50         int fd;
  51         enum debug_logtype logtype;
  52         const char *prog_name;
  53         bool reopening_logs;
  54 } state;
  55
  56 static bool reopen_logs_scheduled;
  57 static bool check_reopen_logs(void)
  58 {
  59         if (state.fd == 0 || reopen_logs_scheduled) {
  60                 reopen_logs_scheduled = false;
  61                 reopen_logs();
  62         }
  63
  64         if (state.fd <= 0)
  65                 return false;
  66
  67         return true;
  68 }
  69
  70 _PUBLIC_ void debug_schedule_reopen_logs(void)
  71 {
  72         reopen_logs_scheduled = true;
  73 }
  74
  75 static void log_timestring(int level, const char *location, const char *func)
  76 {
  77         char *t = NULL;
  78         char *s = NULL;
  79
  80         if (!check_reopen_logs()) return;
  81
  82         if (state.logtype != DEBUG_FILE) return;
  83
  84         t = timestring(NULL, time(NULL));
  85         if (!t) return;
  86
  87         asprintf(&s, "[%s, %d %s:%s()]\n", t, level, location, func);
  88         talloc_free(t);
  89         if (!s) return;
  90
  91         write(state.fd, s, strlen(s));
  92         free(s);
  93 }
  94
  95 /**
  96   the backend for debug messages. Note that the DEBUG() macro has already
  97   ensured that the log level has been met before this is called
  98 */
  99 _PUBLIC_ void dbghdr(int level, const char *location, const char *func)
 100 {
 101         log_timestring(level, location, func);
 102         log_task_id();
 103 }
 104
 105
 106 _PUBLIC_ void dbghdrclass(int level, int dclass, const char *location, const char *func)
 107 {
 108         /* Simple wrapper, Samba 4 doesn't do debug classes */
 109         dbghdr(level, location, func);
 110 }
 111
 112 /**
 113   the backend for debug messages. Note that the DEBUG() macro has already
 114   ensured that the log level has been met before this is called
 115
 116   @note You should never have to call this function directly. Call the DEBUG()
 117   macro instead.
 118 */
 119 _PUBLIC_ void dbgtext(const char *format, ...)
 120 {
 121         va_list ap;
 122         char *s = NULL;
 123
 124         if (!check_reopen_logs()) return;
 125
 126         va_start(ap, format);
 127         vasprintf(&s, format, ap);
 128         va_end(ap);
 129
 130         write(state.fd, s, strlen(s));
 131         free(s);
 132 }
 133
 134 _PUBLIC_ const char *logfile = NULL;
 135
 136 /**
 137   reopen the log file (usually called because the log file name might have changed)
 138 */
 139 _PUBLIC_ void reopen_logs(void)
 140 {
 141         char *fname = NULL;
 142         int old_fd = state.fd;
 143         if (state.reopening_logs) {
 144                 return;
 145         }
 146
 147         switch (state.logtype) {
 148         case DEBUG_STDOUT:
 149                 state.fd = 1;
 150                 break;
 151
 152         case DEBUG_STDERR:
 153                 state.fd = 2;
 154                 break;
 155
 156         case DEBUG_FILE:
 157                 state.reopening_logs = true;
 158                 if (logfile && (*logfile) == '/') {
 159                         fname = strdup(logfile);
 160                 } else {
 161                         asprintf(&fname, "%s/%s.log", dyn_LOGFILEBASE, state.prog_name);
 162                 }
 163                 if (fname) {
 164                         int newfd = open(fname, O_CREAT|O_APPEND|O_WRONLY, 0600);
 165                         if (newfd == -1) {
 166                                 DEBUG(1, ("Failed to open new logfile: %s\n", fname));
 167                                 old_fd = -1;
 168                         } else {
 169                                 state.fd = newfd;
 170                         }
 171                         free(fname);
 172                 } else {
 173                         DEBUG(1, ("Failed to find name for file-based logfile!\n"));
 174                 }
 175                 state.reopening_logs = false;
 176
 177                 break;
 178         }
 179
 180         if (old_fd > 2) {
 181                 close(old_fd);
 182         }
 183 }
 184
 185 /**
 186   control the name of the logfile and whether logging will be to stdout, stderr
 187   or a file
 188 */
 189 _PUBLIC_ void setup_logging(const char *prog_name, enum debug_logtype new_logtype)
 190 {
 191         if (state.logtype < new_logtype) {
 192                 state.logtype = new_logtype;
 193         }
 194         if (prog_name) {
 195                 state.prog_name = prog_name;
 196         }
 197         reopen_logs();
 198 }
 199
 200 /**
 201    Just run logging to stdout for this program
 202 */
 203 _PUBLIC_ void setup_logging_stdout(void)
 204 {
 205         setup_logging(NULL, DEBUG_STDOUT);
 206 }
 207
 208 /**
 209   return a string constant containing n tabs
 210   no more than 10 tabs are returned
 211 */
 212 _PUBLIC_ const char *do_debug_tab(int n)
 213 {
 214         const char *tabs[] = {"", "\t", "\t\t", "\t\t\t", "\t\t\t\t", "\t\t\t\t\t",
 215                               "\t\t\t\t\t\t", "\t\t\t\t\t\t\t", "\t\t\t\t\t\t\t\t",
 216                               "\t\t\t\t\t\t\t\t\t", "\t\t\t\t\t\t\t\t\t\t"};
 217         return tabs[MIN(n, 10)];
 218 }
 219
 220
 221 /**
 222   log suspicious usage - print comments and backtrace
 223 */
 224 _PUBLIC_ void log_suspicious_usage(const char *from, const char *info)
 225 {
 226         if (!debug_handlers.ops.log_suspicious_usage) return;
 227
 228         debug_handlers.ops.log_suspicious_usage(from, info);
 229 }
 230
 231
 232 /**
 233   print suspicious usage - print comments and backtrace
 234 */
 235 _PUBLIC_ void print_suspicious_usage(const char* from, const char* info)
 236 {
 237         if (!debug_handlers.ops.print_suspicious_usage) return;
 238
 239         debug_handlers.ops.print_suspicious_usage(from, info);
 240 }
 241
 242 _PUBLIC_ uint32_t get_task_id(void)
 243 {
 244         if (debug_handlers.ops.get_task_id) {
 245                 return debug_handlers.ops.get_task_id();
 246         }
 247         return getpid();
 248 }
 249
 250 _PUBLIC_ void log_task_id(void)
 251 {
 252         if (!debug_handlers.ops.log_task_id) return;
 253
 254         if (!check_reopen_logs()) return;
 255
 256         debug_handlers.ops.log_task_id(state.fd);
 257 }
 258
 259 /**
 260   register a set of debug handlers.
 261 */
 262 _PUBLIC_ void register_debug_handlers(const char *name, struct debug_ops *ops)
 263 {
 264         debug_handlers.name = name;
 265         debug_handlers.ops = *ops;
 266 }