unbound/util/log.c

   1 /*
   2  * util/log.c - implementation of the log code
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 /**
  36  * \file
  37  * Implementation of log.h.
  38  */
  39
  40 #include "config.h"
  41 #include "util/log.h"
  42 #include "util/locks.h"
  43 #include "ldns/sbuffer.h"
  44 #include <stdarg.h>
  45 #ifdef HAVE_TIME_H
  46 #include <time.h>
  47 #endif
  48 #ifdef HAVE_SYSLOG_H
  49 #  include <syslog.h>
  50 #else
  51 /**define LOG_ constants */
  52 #  define LOG_CRIT 2
  53 #  define LOG_ERR 3
  54 #  define LOG_WARNING 4
  55 #  define LOG_NOTICE 5
  56 #  define LOG_INFO 6
  57 #  define LOG_DEBUG 7
  58 #endif
  59 #ifdef UB_ON_WINDOWS
  60 #  include "winrc/win_svc.h"
  61 #endif
  62
  63 /* default verbosity */
  64 enum verbosity_value verbosity = 0;
  65 /** the file logged to. */
  66 static FILE* logfile = 0;
  67 /** if key has been created */
  68 static int key_created = 0;
  69 /** pthread key for thread ids in logfile */
  70 static ub_thread_key_t logkey;
  71 #ifndef THREADS_DISABLED
  72 /** pthread mutex to protect FILE* */
  73 static lock_quick_t log_lock;
  74 #endif
  75 /** the identity of this executable/process */
  76 static const char* ident="unbound";
  77 #if defined(HAVE_SYSLOG_H) || defined(UB_ON_WINDOWS)
  78 /** are we using syslog(3) to log to */
  79 static int logging_to_syslog = 0;
  80 #endif /* HAVE_SYSLOG_H */
  81 /** time to print in log, if NULL, use time(2) */
  82 static time_t* log_now = NULL;
  83 /** print time in UTC or in secondsfrom1970 */
  84 static int log_time_asc = 0;
  85
  86 void
  87 log_init(const char* filename, int use_syslog, const char* chrootdir)
  88 {
  89         FILE *f;
  90         if(!key_created) {
  91                 key_created = 1;
  92                 ub_thread_key_create(&logkey, NULL);
  93                 lock_quick_init(&log_lock);
  94         }
  95         lock_quick_lock(&log_lock);
  96         if(logfile
  97 #if defined(HAVE_SYSLOG_H) || defined(UB_ON_WINDOWS)
  98         || logging_to_syslog
  99 #endif
 100         ) {
 101                 lock_quick_unlock(&log_lock); /* verbose() needs the lock */
 102                 verbose(VERB_QUERY, "switching log to %s",
 103                         use_syslog?"syslog":(filename&&filename[0]?filename:"stderr"));
 104                 lock_quick_lock(&log_lock);
 105         }
 106         if(logfile && logfile != stderr)
 107                 fclose(logfile);
 108 #ifdef HAVE_SYSLOG_H
 109         if(logging_to_syslog) {
 110                 closelog();
 111                 logging_to_syslog = 0;
 112         }
 113         if(use_syslog) {
 114                 /* do not delay opening until first write, because we may
 115                  * chroot and no longer be able to access dev/log and so on */
 116                 openlog(ident, LOG_NDELAY, LOG_DAEMON);
 117                 logging_to_syslog = 1;
 118                 lock_quick_unlock(&log_lock);
 119                 return;
 120         }
 121 #elif defined(UB_ON_WINDOWS)
 122         if(logging_to_syslog) {
 123                 logging_to_syslog = 0;
 124         }
 125         if(use_syslog) {
 126                 logging_to_syslog = 1;
 127                 lock_quick_unlock(&log_lock);
 128                 return;
 129         }
 130 #endif /* HAVE_SYSLOG_H */
 131         if(!filename || !filename[0]) {
 132                 logfile = stderr;
 133                 lock_quick_unlock(&log_lock);
 134                 return;
 135         }
 136         /* open the file for logging */
 137         if(chrootdir && chrootdir[0] && strncmp(filename, chrootdir,
 138                 strlen(chrootdir)) == 0)
 139                 filename += strlen(chrootdir);
 140         f = fopen(filename, "a");
 141         if(!f) {
 142                 lock_quick_unlock(&log_lock);
 143                 log_err("Could not open logfile %s: %s", filename,
 144                         strerror(errno));
 145                 return;
 146         }
 147 #ifndef UB_ON_WINDOWS
 148         /* line buffering does not work on windows */
 149         setvbuf(f, NULL, (int)_IOLBF, 0);
 150 #endif
 151         logfile = f;
 152         lock_quick_unlock(&log_lock);
 153 }
 154
 155 void log_file(FILE *f)
 156 {
 157         lock_quick_lock(&log_lock);
 158         logfile = f;
 159         lock_quick_unlock(&log_lock);
 160 }
 161
 162 void log_thread_set(int* num)
 163 {
 164         ub_thread_key_set(logkey, num);
 165 }
 166
 167 void log_ident_set(const char* id)
 168 {
 169         ident = id;
 170 }
 171
 172 void log_set_time(time_t* t)
 173 {
 174         log_now = t;
 175 }
 176
 177 void log_set_time_asc(int use_asc)
 178 {
 179         log_time_asc = use_asc;
 180 }
 181
 182 void
 183 log_vmsg(int pri, const char* type,
 184         const char *format, va_list args)
 185 {
 186         char message[MAXSYSLOGMSGLEN];
 187         unsigned int* tid = (unsigned int*)ub_thread_key_get(logkey);
 188         time_t now;
 189 #if defined(HAVE_STRFTIME) && defined(HAVE_LOCALTIME_R)
 190         char tmbuf[32];
 191         struct tm tm;
 192 #elif defined(UB_ON_WINDOWS)
 193         char tmbuf[128], dtbuf[128];
 194 #endif
 195         (void)pri;
 196         vsnprintf(message, sizeof(message), format, args);
 197 #ifdef HAVE_SYSLOG_H
 198         if(logging_to_syslog) {
 199                 syslog(pri, "[%d:%x] %s: %s",
 200                         (int)getpid(), tid?*tid:0, type, message);
 201                 return;
 202         }
 203 #elif defined(UB_ON_WINDOWS)
 204         if(logging_to_syslog) {
 205                 char m[32768];
 206                 HANDLE* s;
 207                 LPCTSTR str = m;
 208                 DWORD tp = MSG_GENERIC_ERR;
 209                 WORD wt = EVENTLOG_ERROR_TYPE;
 210                 if(strcmp(type, "info") == 0) {
 211                         tp=MSG_GENERIC_INFO;
 212                         wt=EVENTLOG_INFORMATION_TYPE;
 213                 } else if(strcmp(type, "warning") == 0) {
 214                         tp=MSG_GENERIC_WARN;
 215                         wt=EVENTLOG_WARNING_TYPE;
 216                 } else if(strcmp(type, "notice") == 0
 217                         || strcmp(type, "debug") == 0) {
 218                         tp=MSG_GENERIC_SUCCESS;
 219                         wt=EVENTLOG_SUCCESS;
 220                 }
 221                 snprintf(m, sizeof(m), "[%s:%x] %s: %s",
 222                         ident, tid?*tid:0, type, message);
 223                 s = RegisterEventSource(NULL, SERVICE_NAME);
 224                 if(!s) return;
 225                 ReportEvent(s, wt, 0, tp, NULL, 1, 0, &str, NULL);
 226                 DeregisterEventSource(s);
 227                 return;
 228         }
 229 #endif /* HAVE_SYSLOG_H */
 230         lock_quick_lock(&log_lock);
 231         if(!logfile) {
 232                 lock_quick_unlock(&log_lock);
 233                 return;
 234         }
 235         if(log_now)
 236                 now = (time_t)*log_now;
 237         else    now = (time_t)time(NULL);
 238 #if defined(HAVE_STRFTIME) && defined(HAVE_LOCALTIME_R)
 239         if(log_time_asc && strftime(tmbuf, sizeof(tmbuf), "%b %d %H:%M:%S",
 240                 localtime_r(&now, &tm))%(sizeof(tmbuf)) != 0) {
 241                 /* %sizeof buf!=0 because old strftime returned max on error */
 242                 fprintf(logfile, "%s %s[%d:%x] %s: %s\n", tmbuf,
 243                         ident, (int)getpid(), tid?*tid:0, type, message);
 244         } else
 245 #elif defined(UB_ON_WINDOWS)
 246         if(log_time_asc && GetTimeFormat(LOCALE_USER_DEFAULT, 0, NULL, NULL,
 247                 tmbuf, sizeof(tmbuf)) && GetDateFormat(LOCALE_USER_DEFAULT, 0,
 248                 NULL, NULL, dtbuf, sizeof(dtbuf))) {
 249                 fprintf(logfile, "%s %s %s[%d:%x] %s: %s\n", dtbuf, tmbuf,
 250                         ident, (int)getpid(), tid?*tid:0, type, message);
 251         } else
 252 #endif
 253         fprintf(logfile, "[" ARG_LL "d] %s[%d:%x] %s: %s\n", (long long)now,
 254                 ident, (int)getpid(), tid?*tid:0, type, message);
 255 #ifdef UB_ON_WINDOWS
 256         /* line buffering does not work on windows */
 257         fflush(logfile);
 258 #endif
 259         lock_quick_unlock(&log_lock);
 260 }
 261
 262 /**
 263  * implementation of log_info
 264  * @param format: format string printf-style.
 265  */
 266 void
 267 log_info(const char *format, ...)
 268 {
 269         va_list args;
 270         va_start(args, format);
 271         log_vmsg(LOG_INFO, "info", format, args);
 272         va_end(args);
 273 }
 274
 275 /**
 276  * implementation of log_err
 277  * @param format: format string printf-style.
 278  */
 279 void
 280 log_err(const char *format, ...)
 281 {
 282         va_list args;
 283         va_start(args, format);
 284         log_vmsg(LOG_ERR, "error", format, args);
 285         va_end(args);
 286 }
 287
 288 /**
 289  * implementation of log_warn
 290  * @param format: format string printf-style.
 291  */
 292 void
 293 log_warn(const char *format, ...)
 294 {
 295         va_list args;
 296         va_start(args, format);
 297         log_vmsg(LOG_WARNING, "warning", format, args);
 298         va_end(args);
 299 }
 300
 301 /**
 302  * implementation of fatal_exit
 303  * @param format: format string printf-style.
 304  */
 305 void
 306 fatal_exit(const char *format, ...)
 307 {
 308         va_list args;
 309         va_start(args, format);
 310         log_vmsg(LOG_CRIT, "fatal error", format, args);
 311         va_end(args);
 312         exit(1);
 313 }
 314
 315 /**
 316  * implementation of verbose
 317  * @param level: verbose level for the message.
 318  * @param format: format string printf-style.
 319  */
 320 void
 321 verbose(enum verbosity_value level, const char* format, ...)
 322 {
 323         va_list args;
 324         va_start(args, format);
 325         if(verbosity >= level) {
 326                 if(level == VERB_OPS)
 327                         log_vmsg(LOG_NOTICE, "notice", format, args);
 328                 else if(level == VERB_DETAIL)
 329                         log_vmsg(LOG_INFO, "info", format, args);
 330                 else    log_vmsg(LOG_DEBUG, "debug", format, args);
 331         }
 332         va_end(args);
 333 }
 334
 335 /** log hex data */
 336 static void
 337 log_hex_f(enum verbosity_value v, const char* msg, void* data, size_t length)
 338 {
 339         size_t i, j;
 340         uint8_t* data8 = (uint8_t*)data;
 341         const char* hexchar = "0123456789ABCDEF";
 342         char buf[1024+1]; /* alloc blocksize hex chars + \0 */
 343         const size_t blocksize = 512;
 344         size_t len;
 345
 346         if(length == 0) {
 347                 verbose(v, "%s[%u]", msg, (unsigned)length);
 348                 return;
 349         }
 350
 351         for(i=0; i<length; i+=blocksize/2) {
 352                 len = blocksize/2;
 353                 if(length - i < blocksize/2)
 354                         len = length - i;
 355                 for(j=0; j<len; j++) {
 356                         buf[j*2] = hexchar[ data8[i+j] >> 4 ];
 357                         buf[j*2 + 1] = hexchar[ data8[i+j] & 0xF ];
 358                 }
 359                 buf[len*2] = 0;
 360                 verbose(v, "%s[%u:%u] %.*s", msg, (unsigned)length,
 361                         (unsigned)i, (int)len*2, buf);
 362         }
 363 }
 364
 365 void
 366 log_hex(const char* msg, void* data, size_t length)
 367 {
 368         log_hex_f(verbosity, msg, data, length);
 369 }
 370
 371 void log_buf(enum verbosity_value level, const char* msg, sldns_buffer* buf)
 372 {
 373         if(verbosity < level)
 374                 return;
 375         log_hex_f(level, msg, sldns_buffer_begin(buf), sldns_buffer_limit(buf));
 376 }
 377
 378 #ifdef USE_WINSOCK
 379 char* wsa_strerror(DWORD err)
 380 {
 381         static char unknown[32];
 382
 383         switch(err) {
 384         case WSA_INVALID_HANDLE: return "Specified event object handle is invalid.";
 385         case WSA_NOT_ENOUGH_MEMORY: return "Insufficient memory available.";
 386         case WSA_INVALID_PARAMETER: return "One or more parameters are invalid.";
 387         case WSA_OPERATION_ABORTED: return "Overlapped operation aborted.";
 388         case WSA_IO_INCOMPLETE: return "Overlapped I/O event object not in signaled state.";
 389         case WSA_IO_PENDING: return "Overlapped operations will complete later.";
 390         case WSAEINTR: return "Interrupted function call.";
 391         case WSAEBADF: return "File handle is not valid.";
 392         case WSAEACCES: return "Permission denied.";
 393         case WSAEFAULT: return "Bad address.";
 394         case WSAEINVAL: return "Invalid argument.";
 395         case WSAEMFILE: return "Too many open files.";
 396         case WSAEWOULDBLOCK: return "Resource temporarily unavailable.";
 397         case WSAEINPROGRESS: return "Operation now in progress.";
 398         case WSAEALREADY: return "Operation already in progress.";
 399         case WSAENOTSOCK: return "Socket operation on nonsocket.";
 400         case WSAEDESTADDRREQ: return "Destination address required.";
 401         case WSAEMSGSIZE: return "Message too long.";
 402         case WSAEPROTOTYPE: return "Protocol wrong type for socket.";
 403         case WSAENOPROTOOPT: return "Bad protocol option.";
 404         case WSAEPROTONOSUPPORT: return "Protocol not supported.";
 405         case WSAESOCKTNOSUPPORT: return "Socket type not supported.";
 406         case WSAEOPNOTSUPP: return "Operation not supported.";
 407         case WSAEPFNOSUPPORT: return "Protocol family not supported.";
 408         case WSAEAFNOSUPPORT: return "Address family not supported by protocol family.";
 409         case WSAEADDRINUSE: return "Address already in use.";
 410         case WSAEADDRNOTAVAIL: return "Cannot assign requested address.";
 411         case WSAENETDOWN: return "Network is down.";
 412         case WSAENETUNREACH: return "Network is unreachable.";
 413         case WSAENETRESET: return "Network dropped connection on reset.";
 414         case WSAECONNABORTED: return "Software caused connection abort.";
 415         case WSAECONNRESET: return "Connection reset by peer.";
 416         case WSAENOBUFS: return "No buffer space available.";
 417         case WSAEISCONN: return "Socket is already connected.";
 418         case WSAENOTCONN: return "Socket is not connected.";
 419         case WSAESHUTDOWN: return "Cannot send after socket shutdown.";
 420         case WSAETOOMANYREFS: return "Too many references.";
 421         case WSAETIMEDOUT: return "Connection timed out.";
 422         case WSAECONNREFUSED: return "Connection refused.";
 423         case WSAELOOP: return "Cannot translate name.";
 424         case WSAENAMETOOLONG: return "Name too long.";
 425         case WSAEHOSTDOWN: return "Host is down.";
 426         case WSAEHOSTUNREACH: return "No route to host.";
 427         case WSAENOTEMPTY: return "Directory not empty.";
 428         case WSAEPROCLIM: return "Too many processes.";
 429         case WSAEUSERS: return "User quota exceeded.";
 430         case WSAEDQUOT: return "Disk quota exceeded.";
 431         case WSAESTALE: return "Stale file handle reference.";
 432         case WSAEREMOTE: return "Item is remote.";
 433         case WSASYSNOTREADY: return "Network subsystem is unavailable.";
 434         case WSAVERNOTSUPPORTED: return "Winsock.dll version out of range.";
 435         case WSANOTINITIALISED: return "Successful WSAStartup not yet performed.";
 436         case WSAEDISCON: return "Graceful shutdown in progress.";
 437         case WSAENOMORE: return "No more results.";
 438         case WSAECANCELLED: return "Call has been canceled.";
 439         case WSAEINVALIDPROCTABLE: return "Procedure call table is invalid.";
 440         case WSAEINVALIDPROVIDER: return "Service provider is invalid.";
 441         case WSAEPROVIDERFAILEDINIT: return "Service provider failed to initialize.";
 442         case WSASYSCALLFAILURE: return "System call failure.";
 443         case WSASERVICE_NOT_FOUND: return "Service not found.";
 444         case WSATYPE_NOT_FOUND: return "Class type not found.";
 445         case WSA_E_NO_MORE: return "No more results.";
 446         case WSA_E_CANCELLED: return "Call was canceled.";
 447         case WSAEREFUSED: return "Database query was refused.";
 448         case WSAHOST_NOT_FOUND: return "Host not found.";
 449         case WSATRY_AGAIN: return "Nonauthoritative host not found.";
 450         case WSANO_RECOVERY: return "This is a nonrecoverable error.";
 451         case WSANO_DATA: return "Valid name, no data record of requested type.";
 452         case WSA_QOS_RECEIVERS: return "QOS receivers.";
 453         case WSA_QOS_SENDERS: return "QOS senders.";
 454         case WSA_QOS_NO_SENDERS: return "No QOS senders.";
 455         case WSA_QOS_NO_RECEIVERS: return "QOS no receivers.";
 456         case WSA_QOS_REQUEST_CONFIRMED: return "QOS request confirmed.";
 457         case WSA_QOS_ADMISSION_FAILURE: return "QOS admission error.";
 458         case WSA_QOS_POLICY_FAILURE: return "QOS policy failure.";
 459         case WSA_QOS_BAD_STYLE: return "QOS bad style.";
 460         case WSA_QOS_BAD_OBJECT: return "QOS bad object.";
 461         case WSA_QOS_TRAFFIC_CTRL_ERROR: return "QOS traffic control error.";
 462         case WSA_QOS_GENERIC_ERROR: return "QOS generic error.";
 463         case WSA_QOS_ESERVICETYPE: return "QOS service type error.";
 464         case WSA_QOS_EFLOWSPEC: return "QOS flowspec error.";
 465         case WSA_QOS_EPROVSPECBUF: return "Invalid QOS provider buffer.";
 466         case WSA_QOS_EFILTERSTYLE: return "Invalid QOS filter style.";
 467         case WSA_QOS_EFILTERTYPE: return "Invalid QOS filter type.";
 468         case WSA_QOS_EFILTERCOUNT: return "Incorrect QOS filter count.";
 469         case WSA_QOS_EOBJLENGTH: return "Invalid QOS object length.";
 470         case WSA_QOS_EFLOWCOUNT: return "Incorrect QOS flow count.";
 471         /*case WSA_QOS_EUNKOWNPSOBJ: return "Unrecognized QOS object.";*/
 472         case WSA_QOS_EPOLICYOBJ: return "Invalid QOS policy object.";
 473         case WSA_QOS_EFLOWDESC: return "Invalid QOS flow descriptor.";
 474         case WSA_QOS_EPSFLOWSPEC: return "Invalid QOS provider-specific flowspec.";
 475         case WSA_QOS_EPSFILTERSPEC: return "Invalid QOS provider-specific filterspec.";
 476         case WSA_QOS_ESDMODEOBJ: return "Invalid QOS shape discard mode object.";
 477         case WSA_QOS_ESHAPERATEOBJ: return "Invalid QOS shaping rate object.";
 478         case WSA_QOS_RESERVED_PETYPE: return "Reserved policy QOS element type.";
 479         default:
 480                 snprintf(unknown, sizeof(unknown),
 481                         "unknown WSA error code %d", (int)err);
 482                 return unknown;
 483         }
 484 }
 485 #endif /* USE_WINSOCK */