1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * http_log.c: Dealing with the logs and errors
25 #include "apr_general.h" /* for signal stuff */
26 #include "apr_strings.h"
27 #include "apr_errno.h"
28 #include "apr_thread_proc.h"
30 #include "apr_signal.h"
31 #include "apr_portable.h"
32 #include "apr_base64.h"
34 #define APR_WANT_STDIO
35 #define APR_WANT_STRFUNC
44 #if APR_HAVE_PROCESS_H
45 #include <process.h> /* for getpid() on Win32 */
48 #include "ap_config.h"
50 #include "http_config.h"
51 #include "http_core.h"
53 #include "http_main.h"
54 #include "util_time.h"
57 APLOG_USE_MODULE(core);
65 APR_HOOK_LINK(error_log)
66 APR_HOOK_LINK(generate_log_id)
69 int AP_DECLARE_DATA ap_default_loglevel = DEFAULT_LOGLEVEL;
73 static const TRANS facilities[] = {
76 {"authpriv",LOG_AUTHPRIV},
82 {"daemon", LOG_DAEMON},
100 {"syslog", LOG_SYSLOG},
109 {"local0", LOG_LOCAL0},
112 {"local1", LOG_LOCAL1},
115 {"local2", LOG_LOCAL2},
118 {"local3", LOG_LOCAL3},
121 {"local4", LOG_LOCAL4},
124 {"local5", LOG_LOCAL5},
127 {"local6", LOG_LOCAL6},
130 {"local7", LOG_LOCAL7},
136 static const TRANS priorities[] = {
137 {"emerg", APLOG_EMERG},
138 {"alert", APLOG_ALERT},
139 {"crit", APLOG_CRIT},
140 {"error", APLOG_ERR},
141 {"warn", APLOG_WARNING},
142 {"notice", APLOG_NOTICE},
143 {"info", APLOG_INFO},
144 {"debug", APLOG_DEBUG},
145 {"trace1", APLOG_TRACE1},
146 {"trace2", APLOG_TRACE2},
147 {"trace3", APLOG_TRACE3},
148 {"trace4", APLOG_TRACE4},
149 {"trace5", APLOG_TRACE5},
150 {"trace6", APLOG_TRACE6},
151 {"trace7", APLOG_TRACE7},
152 {"trace8", APLOG_TRACE8},
156 static apr_pool_t *stderr_pool = NULL;
158 static apr_file_t *stderr_log = NULL;
160 /* track pipe handles to close in child process */
161 typedef struct read_handle_t {
162 struct read_handle_t *next;
166 static read_handle_t *read_handles;
169 * @brief The piped logging structure.
171 * Piped logs are used to move functionality out of the main server.
172 * For example, log rotation is done with piped logs.
175 /** The pool to use for the piped log */
177 /** The pipe between the server and the logging process */
178 apr_file_t *read_fd, *write_fd;
179 #ifdef AP_HAVE_RELIABLE_PIPED_LOGS
180 /** The name of the program the logging process is running */
182 /** The pid of the logging process */
184 /** How to reinvoke program when it must be replaced */
185 apr_cmdtype_e cmdtype;
189 AP_DECLARE(apr_file_t *) ap_piped_log_read_fd(piped_log *pl)
194 AP_DECLARE(apr_file_t *) ap_piped_log_write_fd(piped_log *pl)
199 /* remember to close this handle in the child process
201 * On Win32 this makes zero sense, because we don't
202 * take the parent process's child procs.
203 * If the win32 parent instead passed each and every
204 * logger write handle from itself down to the child,
205 * and the parent manages all aspects of keeping the
206 * reliable pipe log children alive, this would still
207 * make no sense :) Cripple it on Win32.
209 static void close_handle_in_child(apr_pool_t *p, apr_file_t *f)
212 read_handle_t *new_handle;
214 new_handle = apr_pcalloc(p, sizeof(read_handle_t));
215 new_handle->next = read_handles;
216 new_handle->handle = f;
217 read_handles = new_handle;
221 void ap_logs_child_init(apr_pool_t *p, server_rec *s)
223 read_handle_t *cur = read_handles;
226 apr_file_close(cur->handle);
231 AP_DECLARE(void) ap_open_stderr_log(apr_pool_t *p)
233 apr_file_open_stderr(&stderr_log, p);
236 AP_DECLARE(apr_status_t) ap_replace_stderr_log(apr_pool_t *p,
239 apr_file_t *stderr_file;
241 char *filename = ap_server_root_relative(p, fname);
243 ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT,
244 APR_EBADPATH, NULL, "Invalid -E error log file %s",
248 if ((rc = apr_file_open(&stderr_file, filename,
249 APR_APPEND | APR_WRITE | APR_CREATE | APR_LARGEFILE,
250 APR_OS_DEFAULT, p)) != APR_SUCCESS) {
251 ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
252 "%s: could not open error log file %s.",
253 ap_server_argv0, fname);
257 /* This is safe provided we revert it when we are finished.
258 * We don't manager the callers pool!
262 if ((rc = apr_file_open_stderr(&stderr_log, stderr_pool))
264 apr_file_flush(stderr_log);
265 if ((rc = apr_file_dup2(stderr_log, stderr_file, stderr_pool))
267 apr_file_close(stderr_file);
269 * You might ponder why stderr_pool should survive?
270 * The trouble is, stderr_pool may have s_main->error_log,
271 * so we aren't in a position to destory stderr_pool until
272 * the next recycle. There's also an apparent bug which
273 * is not; if some folk decided to call this function before
274 * the core open error logs hook, this pool won't survive.
275 * Neither does the stderr logger, so this isn't a problem.
279 /* Revert, see above */
280 if (stderr_pool == p)
283 if (rc != APR_SUCCESS) {
284 ap_log_error(APLOG_MARK, APLOG_CRIT, rc, NULL,
285 "unable to replace stderr with error log file");
290 static void log_child_errfn(apr_pool_t *pool, apr_status_t err,
291 const char *description)
293 ap_log_error(APLOG_MARK, APLOG_ERR, err, NULL,
297 /* Create a child process running PROGNAME with a pipe connected to
298 * the childs stdin. The write-end of the pipe will be placed in
299 * *FPIN on successful return. If dummy_stderr is non-zero, the
300 * stderr for the child will be the same as the stdout of the parent.
301 * Otherwise the child will inherit the stderr from the parent. */
302 static int log_child(apr_pool_t *p, const char *progname,
303 apr_file_t **fpin, apr_cmdtype_e cmdtype,
306 /* Child process code for 'ErrorLog "|..."';
307 * may want a common framework for this, since I expect it will
308 * be common for other foo-loggers to want this sort of thing...
311 apr_procattr_t *procattr;
315 if (((rc = apr_procattr_create(&procattr, p)) == APR_SUCCESS)
316 && ((rc = apr_procattr_dir_set(procattr,
317 ap_server_root)) == APR_SUCCESS)
318 && ((rc = apr_procattr_cmdtype_set(procattr, cmdtype)) == APR_SUCCESS)
319 && ((rc = apr_procattr_io_set(procattr,
322 APR_NO_PIPE)) == APR_SUCCESS)
323 && ((rc = apr_procattr_error_check_set(procattr, 1)) == APR_SUCCESS)
324 && ((rc = apr_procattr_child_errfn_set(procattr, log_child_errfn))
329 apr_tokenize_to_argv(progname, &args, p);
330 pname = apr_pstrdup(p, args[0]);
331 procnew = (apr_proc_t *)apr_pcalloc(p, sizeof(*procnew));
334 if ((rc = apr_file_open_stdout(&errfile, p)) == APR_SUCCESS)
335 rc = apr_procattr_child_err_set(procattr, errfile, NULL);
338 rc = apr_proc_create(procnew, pname, (const char * const *)args,
341 if (rc == APR_SUCCESS) {
342 apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
343 (*fpin) = procnew->in;
344 /* read handle to pipe not kept open, so no need to call
345 * close_handle_in_child()
353 /* Open the error log for the given server_rec. If IS_MAIN is
354 * non-zero, s is the main server. */
355 static int open_error_log(server_rec *s, int is_main, apr_pool_t *p)
360 if (*s->error_fname == '|') {
361 apr_file_t *dummy = NULL;
362 apr_cmdtype_e cmdtype = APR_PROGRAM_ENV;
363 fname = s->error_fname + 1;
365 /* In 2.4 favor PROGRAM_ENV, accept "||prog" syntax for compatibility
366 * and "|$cmd" to override the default.
367 * Any 2.2 backport would continue to favor SHELLCMD_ENV so there
368 * accept "||prog" to override, and "|$cmd" to ease conversion.
373 cmdtype = APR_SHELLCMD_ENV;
377 /* Spawn a new child logger. If this is the main server_rec,
378 * the new child must use a dummy stderr since the current
379 * stderr might be a pipe to the old logger. Otherwise, the
380 * child inherits the parents stderr. */
381 rc = log_child(p, fname, &dummy, cmdtype, is_main);
382 if (rc != APR_SUCCESS) {
383 ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
384 "Couldn't start ErrorLog process '%s'.",
389 s->error_log = dummy;
393 else if (!strncasecmp(s->error_fname, "syslog", 6)) {
394 if ((fname = strchr(s->error_fname, ':'))) {
398 for (fac = facilities; fac->t_name; fac++) {
399 if (!strcasecmp(fname, fac->t_name)) {
400 openlog(ap_server_argv0, LOG_NDELAY|LOG_CONS|LOG_PID,
408 openlog(ap_server_argv0, LOG_NDELAY|LOG_CONS|LOG_PID, LOG_LOCAL7);
415 fname = ap_server_root_relative(p, s->error_fname);
417 ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EBADPATH, NULL,
418 "%s: Invalid error log path %s.",
419 ap_server_argv0, s->error_fname);
422 if ((rc = apr_file_open(&s->error_log, fname,
423 APR_APPEND | APR_WRITE | APR_CREATE | APR_LARGEFILE,
424 APR_OS_DEFAULT, p)) != APR_SUCCESS) {
425 ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
426 "%s: could not open error log file %s.",
427 ap_server_argv0, fname);
435 int ap_open_logs(apr_pool_t *pconf, apr_pool_t *p /* plog */,
436 apr_pool_t *ptemp, server_rec *s_main)
438 apr_pool_t *stderr_p;
439 server_rec *virt, *q;
443 /* Register to throw away the read_handles list when we
444 * cleanup plog. Upon fork() for the apache children,
445 * this read_handles list is closed so only the parent
446 * can relaunch a lost log child. These read handles
447 * are always closed on exec.
448 * We won't care what happens to our stderr log child
449 * between log phases, so we don't mind losing stderr's
450 * read_handle a little bit early.
452 apr_pool_cleanup_register(p, &read_handles, ap_pool_cleanup_set_null,
453 apr_pool_cleanup_null);
455 /* HERE we need a stdout log that outlives plog.
456 * We *presume* the parent of plog is a process
457 * or global pool which spans server restarts.
458 * Create our stderr_pool as a child of the plog's
461 apr_pool_create(&stderr_p, apr_pool_parent_get(p));
462 apr_pool_tag(stderr_p, "stderr_pool");
464 if (open_error_log(s_main, 1, stderr_p) != OK) {
469 if (s_main->error_log) {
472 /* Replace existing stderr with new log. */
473 apr_file_flush(s_main->error_log);
474 rv = apr_file_dup2(stderr_log, s_main->error_log, stderr_p);
475 if (rv != APR_SUCCESS) {
476 ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s_main,
477 "unable to replace stderr with error_log");
480 /* We are done with stderr_pool, close it, killing
481 * the previous generation's stderr logger
484 apr_pool_destroy(stderr_pool);
485 stderr_pool = stderr_p;
488 * Now that we have dup'ed s_main->error_log to stderr_log
489 * close it and set s_main->error_log to stderr_log. This avoids
490 * this fd being inherited by the next piped logger who would
491 * keep open the writing end of the pipe that this one uses
492 * as stdin. This in turn would prevent the piped logger from
495 apr_file_close(s_main->error_log);
496 s_main->error_log = stderr_log;
499 /* note that stderr may still need to be replaced with something
500 * because it points to the old error log, or back to the tty
502 * XXX: This is BS - /dev/null is non-portable
503 * errno-as-apr_status_t is also non-portable
505 if (replace_stderr && freopen("/dev/null", "w", stderr) == NULL) {
506 ap_log_error(APLOG_MARK, APLOG_CRIT, errno, s_main,
507 "unable to replace stderr with /dev/null");
510 for (virt = s_main->next; virt; virt = virt->next) {
511 if (virt->error_fname) {
512 for (q=s_main; q != virt; q = q->next) {
513 if (q->error_fname != NULL
514 && strcmp(q->error_fname, virt->error_fname) == 0) {
520 if (open_error_log(virt, 0, p) != OK) {
525 virt->error_log = q->error_log;
529 virt->error_log = s_main->error_log;
535 AP_DECLARE(void) ap_error_log2stderr(server_rec *s) {
536 apr_file_t *errfile = NULL;
538 apr_file_open_stderr(&errfile, s->process->pool);
539 if (s->error_log != NULL) {
540 apr_file_dup2(s->error_log, errfile, s->process->pool);
544 static int cpystrn(char *buf, const char *arg, int buflen)
549 end = apr_cpystrn(buf, arg, buflen);
554 static int log_remote_address(const ap_errorlog_info *info, const char *arg,
555 char *buf, int buflen)
558 return apr_snprintf(buf, buflen, "%s:%d", info->c->remote_ip,
559 info->c->remote_addr->port);
564 static int log_local_address(const ap_errorlog_info *info, const char *arg,
565 char *buf, int buflen)
568 return apr_snprintf(buf, buflen, "%s:%d", info->c->local_ip,
569 info->c->local_addr->port);
574 static int log_pid(const ap_errorlog_info *info, const char *arg,
575 char *buf, int buflen)
577 pid_t pid = getpid();
578 return apr_snprintf(buf, buflen, "%" APR_PID_T_FMT, pid);
581 static int log_tid(const ap_errorlog_info *info, const char *arg,
582 char *buf, int buflen)
587 if (ap_mpm_query(AP_MPMQ_IS_THREADED, &result) == APR_SUCCESS
588 && result != AP_MPMQ_NOT_SUPPORTED)
590 apr_os_thread_t tid = apr_os_thread_current();
591 return apr_snprintf(buf, buflen, "%pT", &tid);
597 static int log_ctime(const ap_errorlog_info *info, const char *arg,
598 char *buf, int buflen)
600 int time_len = buflen;
601 int option = AP_CTIME_OPTION_NONE;
605 case 'u': option |= AP_CTIME_OPTION_USEC;
607 case 'c': option |= AP_CTIME_OPTION_COMPACT;
613 ap_recent_ctime_ex(buf, apr_time_now(), option, &time_len);
615 /* ap_recent_ctime_ex includes the trailing \0 in time_len */
619 static int log_loglevel(const ap_errorlog_info *info, const char *arg,
620 char *buf, int buflen)
625 return cpystrn(buf, priorities[info->level].t_name, buflen);
628 static int log_log_id(const ap_errorlog_info *info, const char *arg,
629 char *buf, int buflen)
632 * C: log conn log_id if available,
633 * c: log conn log id if available and not a once-per-request log line
634 * else: log request log id if available
636 if (arg && !strcasecmp(arg, "c")) {
637 if (info->c && (*arg != 'C' || !info->r)) {
638 return cpystrn(buf, info->c->log_id, buflen);
642 return cpystrn(buf, info->r->log_id, buflen);
647 static int log_keepalives(const ap_errorlog_info *info, const char *arg,
648 char *buf, int buflen)
653 return apr_snprintf(buf, buflen, "%d", info->c->keepalives);
656 static int log_module_name(const ap_errorlog_info *info, const char *arg,
657 char *buf, int buflen)
659 return cpystrn(buf, ap_find_module_short_name(info->module_index), buflen);
662 static int log_file_line(const ap_errorlog_info *info, const char *arg,
663 char *buf, int buflen)
665 if (info->file == NULL) {
669 const char *file = info->file;
670 #if defined(_OSD_POSIX) || defined(WIN32) || defined(__MVS__)
672 char *e = strrchr(file, '/');
675 e = strrchr(file, '\\');
679 /* In OSD/POSIX, the compiler returns for __FILE__
680 * a string like: __FILE__="*POSIX(/usr/include/stdio.h)"
681 * (it even returns an absolute path for sources in
682 * the current directory). Here we try to strip this
683 * down to the basename.
685 if (e != NULL && e[1] != '\0') {
686 apr_snprintf(tmp, sizeof(tmp), "%s", &e[1]);
687 e = &tmp[strlen(tmp)-1];
693 #else /* _OSD_POSIX || WIN32 */
695 /* On Unix, __FILE__ may be an absolute path in a
697 if (file[0] == '/' && (p = ap_strrchr_c(file, '/')) != NULL) {
700 #endif /*_OSD_POSIX || WIN32 */
701 return apr_snprintf(buf, buflen, "%s(%d)", file, info->line);
705 static int log_apr_status(const ap_errorlog_info *info, const char *arg,
706 char *buf, int buflen)
708 apr_status_t status = info->status;
713 if (status < APR_OS_START_EAIERR) {
714 len = apr_snprintf(buf, buflen, "(%d)", status);
716 else if (status < APR_OS_START_SYSERR) {
717 len = apr_snprintf(buf, buflen, "(EAI %d)",
718 status - APR_OS_START_EAIERR);
720 else if (status < 100000 + APR_OS_START_SYSERR) {
721 len = apr_snprintf(buf, buflen, "(OS %d)",
722 status - APR_OS_START_SYSERR);
725 len = apr_snprintf(buf, buflen, "(os 0x%08x)",
726 status - APR_OS_START_SYSERR);
728 apr_strerror(status, buf + len, buflen - len);
729 len += strlen(buf + len);
733 static int log_server_name(const ap_errorlog_info *info, const char *arg,
734 char *buf, int buflen)
737 return cpystrn(buf, ap_get_server_name((request_rec *)info->r), buflen);
742 static int log_virtual_host(const ap_errorlog_info *info, const char *arg,
743 char *buf, int buflen)
746 return cpystrn(buf, info->s->server_hostname, buflen);
752 static int log_table_entry(const apr_table_t *table, const char *name,
753 char *buf, int buflen)
755 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
757 char scratch[MAX_STRING_LEN];
759 if ((value = apr_table_get(table, name)) != NULL) {
760 ap_escape_errorlog_item(scratch, value, MAX_STRING_LEN);
761 return cpystrn(buf, scratch, buflen);
766 return cpystrn(buf, apr_table_get(table, name), buflen);
770 static int log_header(const ap_errorlog_info *info, const char *arg,
771 char *buf, int buflen)
774 return log_table_entry(info->r->headers_in, arg, buf, buflen);
779 static int log_note(const ap_errorlog_info *info, const char *arg,
780 char *buf, int buflen)
782 /* XXX: maybe escaping the entry is not necessary for notes? */
784 return log_table_entry(info->r->notes, arg, buf, buflen);
789 static int log_env_var(const ap_errorlog_info *info, const char *arg,
790 char *buf, int buflen)
793 return log_table_entry(info->r->subprocess_env, arg, buf, buflen);
798 static int core_generate_log_id(const conn_rec *c, const request_rec *r,
799 const char **idstring)
801 apr_uint64_t id, tmp;
806 if (r && r->request_time) {
807 id = (apr_uint64_t)r->request_time;
810 id = (apr_uint64_t)apr_time_now();
814 if (sizeof(pid_t) > 2) {
830 apr_uintptr_t tmp2 = (apr_uintptr_t)c->current_thread;
837 len = apr_base64_encode_len(sizeof(id)); /* includes trailing \0 */
838 encoded = apr_palloc(r ? r->pool : c->pool, len);
839 apr_base64_encode(encoded, (char *)&id, sizeof(id));
841 /* Skip the last char, it is always '=' */
842 encoded[len - 2] = '\0';
849 static void add_log_id(const conn_rec *c, const request_rec *r)
852 /* need to cast const away */
854 id = &((request_rec *)r)->log_id;
857 id = &((conn_rec *)c)->log_id;
860 ap_run_generate_log_id(c, r, id);
863 AP_DECLARE(void) ap_register_log_hooks(apr_pool_t *p)
865 ap_hook_generate_log_id(core_generate_log_id, NULL, NULL,
866 APR_HOOK_REALLY_LAST);
868 ap_register_errorlog_handler(p, "a", log_remote_address, 0);
869 ap_register_errorlog_handler(p, "A", log_local_address, 0);
870 ap_register_errorlog_handler(p, "e", log_env_var, 0);
871 ap_register_errorlog_handler(p, "E", log_apr_status, 0);
872 ap_register_errorlog_handler(p, "F", log_file_line, 0);
873 ap_register_errorlog_handler(p, "i", log_header, 0);
874 ap_register_errorlog_handler(p, "k", log_keepalives, 0);
875 ap_register_errorlog_handler(p, "l", log_loglevel, 0);
876 ap_register_errorlog_handler(p, "L", log_log_id, 0);
877 ap_register_errorlog_handler(p, "m", log_module_name, 0);
878 ap_register_errorlog_handler(p, "n", log_note, 0);
879 ap_register_errorlog_handler(p, "P", log_pid, 0);
880 ap_register_errorlog_handler(p, "t", log_ctime, 0);
881 ap_register_errorlog_handler(p, "T", log_tid, 0);
882 ap_register_errorlog_handler(p, "v", log_virtual_host, 0);
883 ap_register_errorlog_handler(p, "V", log_server_name, 0);
887 * This is used if no error log format is defined and during startup.
888 * It automatically omits the timestamp if logging to syslog.
890 static int do_errorlog_default(const ap_errorlog_info *info, char *buf,
891 int buflen, int *errstr_start, int *errstr_end,
892 const char *errstr_fmt, va_list args)
897 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
898 char scratch[MAX_STRING_LEN];
901 if (!info->using_syslog && !info->startup) {
903 len += log_ctime(info, "u", buf + len, buflen - len);
908 if (!info->startup) {
910 len += log_module_name(info, NULL, buf + len, buflen - len);
912 len += log_loglevel(info, NULL, buf + len, buflen - len);
913 len += cpystrn(buf + len, "] [pid ", buflen - len);
915 len += log_pid(info, NULL, buf + len, buflen - len);
918 len += cpystrn(buf + len, ":tid ", buflen - len);
919 item_len = log_tid(info, NULL, buf + len, buflen - len);
929 if (info->level >= APLOG_DEBUG) {
930 item_len = log_file_line(info, NULL, buf + len, buflen - len);
933 len += cpystrn(buf + len, ": ", buflen - len);
938 item_len = log_apr_status(info, NULL, buf + len, buflen - len);
941 len += cpystrn(buf + len, ": ", buflen - len);
947 * remote_ip can be client or backend server. If we have a scoreboard
948 * handle, it is likely a client.
950 len += apr_snprintf(buf + len, buflen - len,
951 info->c->sbh ? "[client %s:%d] " : "[remote %s:%d] ",
952 info->c->remote_ip, info->c->remote_addr->port);
955 /* the actual error message */
957 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
958 if (apr_vsnprintf(scratch, MAX_STRING_LEN, errstr_fmt, args)) {
959 len += ap_escape_errorlog_item(buf + len, scratch,
964 len += apr_vsnprintf(buf + len, buflen - len, errstr_fmt, args);
969 len += cpystrn(buf + len, ", referer: ", buflen - len);
970 item_len = log_header(info, "Referer", buf + len, buflen - len);
979 static int do_errorlog_format(apr_array_header_t *fmt, ap_errorlog_info *info,
980 char *buf, int buflen, int *errstr_start,
981 int *errstr_end, const char *err_fmt, va_list args)
983 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
984 char scratch[MAX_STRING_LEN];
990 ap_errorlog_format_item *items = (ap_errorlog_format_item *)fmt->elts;
992 for (i = 0; i < fmt->nelts; ++i) {
993 ap_errorlog_format_item *item = &items[i];
994 if (item->flags & AP_ERRORLOG_FLAG_FIELD_SEP) {
1003 if (item->flags & AP_ERRORLOG_FLAG_MESSAGE) {
1004 /* the actual error message */
1005 *errstr_start = len;
1006 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
1007 if (apr_vsnprintf(scratch, MAX_STRING_LEN, err_fmt, args)) {
1008 len += ap_escape_errorlog_item(buf + len, scratch,
1013 len += apr_vsnprintf(buf + len, buflen - len, err_fmt, args);
1017 else if (skipping) {
1020 else if ((int)item->min_loglevel > info->level) {
1025 int item_len = (*item->func)(info, item->arg, buf + len,
1028 if (item->flags & AP_ERRORLOG_FLAG_REQUIRED) {
1029 /* required item is empty. skip whole line */
1033 else if (item->flags & AP_ERRORLOG_FLAG_NULL_AS_HYPHEN) {
1049 static void write_logline(char *errstr, apr_size_t len, apr_file_t *logf,
1052 /* NULL if we are logging to syslog */
1054 /* Truncate for the terminator (as apr_snprintf does) */
1055 if (len > MAX_STRING_LEN - sizeof(APR_EOL_STR)) {
1056 len = MAX_STRING_LEN - sizeof(APR_EOL_STR);
1058 strcpy(errstr + len, APR_EOL_STR);
1059 apr_file_puts(errstr, logf);
1060 apr_file_flush(logf);
1064 syslog(level < LOG_PRIMASK ? level : APLOG_DEBUG, "%s", errstr);
1069 static void log_error_core(const char *file, int line, int module_index,
1071 apr_status_t status, const server_rec *s,
1073 const request_rec *r, apr_pool_t *pool,
1074 const char *fmt, va_list args)
1076 char errstr[MAX_STRING_LEN];
1077 apr_file_t *logf = NULL;
1078 int level_and_mask = level & APLOG_LEVELMASK;
1079 const request_rec *rmain = NULL;
1080 core_server_config *sconf = NULL;
1081 ap_errorlog_info info;
1083 /* do we need to log once-per-req or once-per-conn info? */
1084 int log_conn_info = 0, log_req_info = 0;
1085 apr_array_header_t **lines = NULL;
1087 int line_number = 0;
1089 if (r && r->connection) {
1095 * If we are doing stderr logging (startup), don't log messages that are
1096 * above the default server log level unless it is a startup/shutdown
1100 if ((level_and_mask != APLOG_NOTICE)
1101 && (level_and_mask > ap_default_loglevel)) {
1109 int configured_level = r ? ap_get_request_module_loglevel(r, module_index) :
1110 c ? ap_get_conn_server_module_loglevel(c, s, module_index) :
1111 ap_get_server_module_loglevel(s, module_index);
1114 * If we are doing normal logging, don't log messages that are
1115 * above the module's log level unless it is a startup/shutdown notice
1117 if ((level_and_mask != APLOG_NOTICE)
1118 && (level_and_mask > configured_level)) {
1122 logf = s->error_log;
1126 * If we are doing syslog logging, don't log messages that are
1127 * above the module's log level (including a startup/shutdown notice)
1129 if (level_and_mask > configured_level) {
1134 /* the faked server_rec from mod_cgid does not have s->module_config */
1135 if (s->module_config) {
1136 sconf = ap_get_module_config(s->module_config, &core_module);
1137 if (c && !c->log_id) {
1138 add_log_id(c, NULL);
1139 if (sconf->error_log_conn && sconf->error_log_conn->nelts > 0)
1148 if (!rmain->log_id) {
1149 /* XXX: do we need separate log ids for subrequests? */
1150 if (sconf->error_log_req && sconf->error_log_req->nelts > 0)
1153 * XXX: potential optimization: only create log id if %L is
1154 * XXX: actually used
1156 add_log_id(c, rmain);
1167 info.using_syslog = (logf == NULL);
1168 info.startup = ((level & APLOG_STARTUP) == APLOG_STARTUP);
1172 apr_array_header_t *log_format;
1173 int len = 0, errstr_start = 0, errstr_end = 0;
1174 /* XXX: potential optimization: format common prefixes only once */
1175 if (log_conn_info) {
1176 /* once-per-connection info */
1177 if (line_number == 0) {
1178 lines = (apr_array_header_t **)sconf->error_log_conn->elts;
1182 info.module_index = APLOG_NO_MODULE;
1185 log_format = lines[line_number++];
1187 if (line_number == sconf->error_log_conn->nelts) {
1188 /* this is the last line of once-per-connection info */
1193 else if (log_req_info) {
1194 /* once-per-request info */
1195 if (line_number == 0) {
1196 lines = (apr_array_header_t **)sconf->error_log_req->elts;
1200 info.module_index = APLOG_NO_MODULE;
1203 log_format = lines[line_number++];
1205 if (line_number == sconf->error_log_req->nelts) {
1206 /* this is the last line of once-per-request info */
1212 /* the actual error message */
1215 info.level = level_and_mask;
1216 info.module_index = module_index;
1219 info.status = status;
1220 log_format = sconf ? sconf->error_log_format : NULL;
1225 * prepare and log one line
1229 len += do_errorlog_format(log_format, &info, errstr + len,
1230 MAX_STRING_LEN - len,
1231 &errstr_start, &errstr_end, fmt, args);
1234 len += do_errorlog_default(&info, errstr + len, MAX_STRING_LEN - len,
1235 &errstr_start, &errstr_end, fmt, args);
1241 * Don't log empty lines. This can happen with once-per-conn/req
1242 * info if an item with AP_ERRORLOG_FLAG_REQUIRED is NULL.
1246 write_logline(errstr, len, logf, level_and_mask);
1249 /* only pass the real error string to the hook */
1250 errstr[errstr_end] = '\0';
1251 ap_run_error_log(file, line, module_index, level, status, s, r, pool,
1252 errstr + errstr_start);
1259 AP_DECLARE(void) ap_log_error_(const char *file, int line, int module_index,
1260 int level, apr_status_t status,
1261 const server_rec *s, const char *fmt, ...)
1265 va_start(args, fmt);
1266 log_error_core(file, line, module_index, level, status, s, NULL, NULL,
1271 AP_DECLARE(void) ap_log_perror_(const char *file, int line, int module_index,
1272 int level, apr_status_t status, apr_pool_t *p,
1273 const char *fmt, ...)
1277 va_start(args, fmt);
1278 log_error_core(file, line, module_index, level, status, NULL, NULL, NULL,
1283 AP_DECLARE(void) ap_log_rerror_(const char *file, int line, int module_index,
1284 int level, apr_status_t status,
1285 const request_rec *r, const char *fmt, ...)
1289 va_start(args, fmt);
1290 log_error_core(file, line, module_index, level, status, r->server, NULL, r,
1294 * IF APLOG_TOCLIENT is set,
1295 * AND the error level is 'warning' or more severe,
1296 * AND there isn't already error text associated with this request,
1297 * THEN make the message text available to ErrorDocument and
1298 * other error processors.
1302 if ((level & APLOG_TOCLIENT)
1303 && ((level & APLOG_LEVELMASK) <= APLOG_WARNING)
1304 && (apr_table_get(r->notes, "error-notes") == NULL)) {
1305 apr_table_setn(r->notes, "error-notes",
1306 ap_escape_html(r->pool, apr_pvsprintf(r->pool, fmt,
1312 AP_DECLARE(void) ap_log_cserror_(const char *file, int line, int module_index,
1313 int level, apr_status_t status,
1314 const conn_rec *c, const server_rec *s,
1315 const char *fmt, ...)
1319 va_start(args, fmt);
1320 log_error_core(file, line, module_index, level, status, s, c,
1321 NULL, NULL, fmt, args);
1325 AP_DECLARE(void) ap_log_cerror_(const char *file, int line, int module_index,
1326 int level, apr_status_t status,
1327 const conn_rec *c, const char *fmt, ...)
1331 va_start(args, fmt);
1332 log_error_core(file, line, module_index, level, status, c->base_server, c,
1333 NULL, NULL, fmt, args);
1337 AP_DECLARE(void) ap_log_command_line(apr_pool_t *plog, server_rec *s)
1340 process_rec *process = s->process;
1344 /* Piece together the command line from the pieces
1345 * in process->argv, with spaces in between.
1347 for (i = 0; i < process->argc; i++) {
1348 len_needed += strlen(process->argv[i]) + 1;
1351 result = (char *) apr_palloc(plog, len_needed);
1354 for (i = 0; i < process->argc; i++) {
1355 strcat(result, process->argv[i]);
1356 if ((i+1)< process->argc) {
1357 strcat(result, " ");
1360 ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s,
1361 "Command line: '%s'", result);
1364 AP_DECLARE(void) ap_remove_pid(apr_pool_t *p, const char *rel_fname)
1367 const char *fname = ap_server_root_relative(p, rel_fname);
1369 if (fname != NULL) {
1370 rv = apr_file_remove(fname, p);
1371 if (rv != APR_SUCCESS) {
1372 ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
1373 "failed to remove PID file %s", fname);
1376 ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
1377 "removed PID file %s (pid=%" APR_PID_T_FMT ")",
1383 AP_DECLARE(void) ap_log_pid(apr_pool_t *p, const char *filename)
1385 apr_file_t *pid_file = NULL;
1387 static pid_t saved_pid = -1;
1396 fname = ap_server_root_relative(p, filename);
1398 ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, APR_EBADPATH,
1399 NULL, "Invalid PID file path %s, ignoring.", filename);
1404 if (mypid != saved_pid
1405 && apr_stat(&finfo, fname, APR_FINFO_MTIME, p) == APR_SUCCESS) {
1406 /* AP_SIG_GRACEFUL and HUP call this on each restart.
1407 * Only warn on first time through for this pid.
1409 * XXX: Could just write first time through too, although
1410 * that may screw up scripts written to do something
1411 * based on the last modification time of the pid file.
1413 ap_log_perror(APLOG_MARK, APLOG_WARNING, 0, p,
1414 "pid file %s overwritten -- Unclean "
1415 "shutdown of previous Apache run?",
1419 if ((rv = apr_file_open(&pid_file, fname,
1420 APR_WRITE | APR_CREATE | APR_TRUNCATE,
1421 APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD, p))
1423 ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL,
1424 "could not create %s", fname);
1425 ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
1426 "%s: could not log pid to file %s",
1427 ap_server_argv0, fname);
1430 apr_file_printf(pid_file, "%" APR_PID_T_FMT APR_EOL_STR, mypid);
1431 apr_file_close(pid_file);
1435 AP_DECLARE(apr_status_t) ap_read_pid(apr_pool_t *p, const char *filename,
1438 const apr_size_t BUFFER_SIZE = sizeof(long) * 3 + 2; /* see apr_ltoa */
1439 apr_file_t *pid_file = NULL;
1443 apr_size_t bytes_read;
1446 return APR_EGENERAL;
1449 fname = ap_server_root_relative(p, filename);
1451 ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, APR_EBADPATH,
1452 NULL, "Invalid PID file path %s, ignoring.", filename);
1453 return APR_EGENERAL;
1456 rv = apr_file_open(&pid_file, fname, APR_READ, APR_OS_DEFAULT, p);
1457 if (rv != APR_SUCCESS) {
1461 buf = apr_palloc(p, BUFFER_SIZE);
1463 rv = apr_file_read_full(pid_file, buf, BUFFER_SIZE - 1, &bytes_read);
1464 if (rv != APR_SUCCESS && rv != APR_EOF) {
1468 /* If we fill the buffer, we're probably reading a corrupt pid file.
1469 * To be nice, let's also ensure the first char is a digit. */
1470 if (bytes_read == 0 || bytes_read == BUFFER_SIZE - 1 || !apr_isdigit(*buf)) {
1471 return APR_EGENERAL;
1474 buf[bytes_read] = '\0';
1475 *mypid = strtol(buf, &endptr, 10);
1477 apr_file_close(pid_file);
1481 AP_DECLARE(void) ap_log_assert(const char *szExp, const char *szFile,
1484 char time_str[APR_CTIME_LEN];
1486 apr_ctime(time_str, apr_time_now());
1487 ap_log_error(APLOG_MARK, APLOG_CRIT, 0, NULL,
1488 "[%s] file %s, line %d, assertion \"%s\" failed",
1489 time_str, szFile, nLine, szExp);
1493 /* unix assert does an abort leading to a core dump */
1498 /* piped log support */
1500 #ifdef AP_HAVE_RELIABLE_PIPED_LOGS
1501 /* forward declaration */
1502 static void piped_log_maintenance(int reason, void *data, apr_wait_t status);
1504 /* Spawn the piped logger process pl->program. */
1505 static apr_status_t piped_log_spawn(piped_log *pl)
1507 apr_procattr_t *procattr;
1508 apr_proc_t *procnew = NULL;
1509 apr_status_t status;
1511 if (((status = apr_procattr_create(&procattr, pl->p)) != APR_SUCCESS) ||
1512 ((status = apr_procattr_dir_set(procattr, ap_server_root))
1514 ((status = apr_procattr_cmdtype_set(procattr, pl->cmdtype))
1516 ((status = apr_procattr_child_in_set(procattr,
1520 ((status = apr_procattr_child_errfn_set(procattr, log_child_errfn))
1522 ((status = apr_procattr_error_check_set(procattr, 1)) != APR_SUCCESS)) {
1524 /* Something bad happened, give up and go away. */
1525 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
1526 "piped_log_spawn: unable to setup child process '%s': %s",
1527 pl->program, apr_strerror(status, buf, sizeof(buf)));
1533 apr_tokenize_to_argv(pl->program, &args, pl->p);
1534 pname = apr_pstrdup(pl->p, args[0]);
1535 procnew = apr_pcalloc(pl->p, sizeof(apr_proc_t));
1536 status = apr_proc_create(procnew, pname, (const char * const *) args,
1537 NULL, procattr, pl->p);
1539 if (status == APR_SUCCESS) {
1541 /* procnew->in was dup2'd from pl->write_fd;
1542 * since the original fd is still valid, close the copy to
1544 apr_file_close(procnew->in);
1546 apr_proc_other_child_register(procnew, piped_log_maintenance, pl,
1547 pl->write_fd, pl->p);
1548 close_handle_in_child(pl->p, pl->read_fd);
1552 /* Something bad happened, give up and go away. */
1553 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
1554 "unable to start piped log program '%s': %s",
1555 pl->program, apr_strerror(status, buf, sizeof(buf)));
1563 static void piped_log_maintenance(int reason, void *data, apr_wait_t status)
1565 piped_log *pl = data;
1570 case APR_OC_REASON_DEATH:
1571 case APR_OC_REASON_LOST:
1572 pl->pid = NULL; /* in case we don't get it going again, this
1573 * tells other logic not to try to kill it
1575 apr_proc_other_child_unregister(pl);
1576 stats = ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state);
1577 if (stats != APR_SUCCESS) {
1578 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
1579 "can't query MPM state; not restarting "
1580 "piped log program '%s'",
1583 else if (mpm_state != AP_MPMQ_STOPPING) {
1584 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
1585 "piped log program '%s' failed unexpectedly",
1587 if ((stats = piped_log_spawn(pl)) != APR_SUCCESS) {
1588 /* what can we do? This could be the error log we're having
1589 * problems opening up... */
1591 ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
1592 "piped_log_maintenance: unable to respawn '%s': %s",
1593 pl->program, apr_strerror(stats, buf, sizeof(buf)));
1598 case APR_OC_REASON_UNWRITABLE:
1599 /* We should not kill off the pipe here, since it may only be full.
1600 * If it really is locked, we should kill it off manually. */
1603 case APR_OC_REASON_RESTART:
1604 if (pl->pid != NULL) {
1605 apr_proc_kill(pl->pid, SIGTERM);
1610 case APR_OC_REASON_UNREGISTER:
1616 static apr_status_t piped_log_cleanup_for_exec(void *data)
1618 piped_log *pl = data;
1620 apr_file_close(pl->read_fd);
1621 apr_file_close(pl->write_fd);
1626 static apr_status_t piped_log_cleanup(void *data)
1628 piped_log *pl = data;
1630 if (pl->pid != NULL) {
1631 apr_proc_kill(pl->pid, SIGTERM);
1633 return piped_log_cleanup_for_exec(data);
1637 AP_DECLARE(piped_log *) ap_open_piped_log_ex(apr_pool_t *p,
1638 const char *program,
1639 apr_cmdtype_e cmdtype)
1643 pl = apr_palloc(p, sizeof (*pl));
1645 pl->program = apr_pstrdup(p, program);
1647 pl->cmdtype = cmdtype;
1648 if (apr_file_pipe_create_ex(&pl->read_fd,
1650 APR_FULL_BLOCK, p) != APR_SUCCESS) {
1653 apr_pool_cleanup_register(p, pl, piped_log_cleanup,
1654 piped_log_cleanup_for_exec);
1655 if (piped_log_spawn(pl) != APR_SUCCESS) {
1656 apr_pool_cleanup_kill(p, pl, piped_log_cleanup);
1657 apr_file_close(pl->read_fd);
1658 apr_file_close(pl->write_fd);
1664 #else /* !AP_HAVE_RELIABLE_PIPED_LOGS */
1666 static apr_status_t piped_log_cleanup(void *data)
1668 piped_log *pl = data;
1670 apr_file_close(pl->write_fd);
1674 AP_DECLARE(piped_log *) ap_open_piped_log_ex(apr_pool_t *p,
1675 const char *program,
1676 apr_cmdtype_e cmdtype)
1679 apr_file_t *dummy = NULL;
1682 rc = log_child(p, program, &dummy, cmdtype, 0);
1683 if (rc != APR_SUCCESS) {
1684 ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
1685 "Couldn't start piped log process '%s'.",
1686 (program == NULL) ? "NULL" : program);
1690 pl = apr_palloc(p, sizeof (*pl));
1693 pl->write_fd = dummy;
1694 apr_pool_cleanup_register(p, pl, piped_log_cleanup, piped_log_cleanup);
1701 AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p,
1702 const char *program)
1704 apr_cmdtype_e cmdtype = APR_PROGRAM_ENV;
1706 /* In 2.4 favor PROGRAM_ENV, accept "||prog" syntax for compatibility
1707 * and "|$cmd" to override the default.
1708 * Any 2.2 backport would continue to favor SHELLCMD_ENV so there
1709 * accept "||prog" to override, and "|$cmd" to ease conversion.
1711 if (*program == '|')
1713 if (*program == '$') {
1714 cmdtype = APR_SHELLCMD_ENV;
1718 return ap_open_piped_log_ex(p, program, cmdtype);
1721 AP_DECLARE(void) ap_close_piped_log(piped_log *pl)
1723 apr_pool_cleanup_run(pl->p, pl, piped_log_cleanup);
1726 AP_DECLARE(const char *) ap_parse_log_level(const char *str, int *val)
1728 char *err = "Log level keyword must be one of emerg/alert/crit/error/warn/"
1729 "notice/info/debug/trace1/.../trace8";
1735 while (priorities[i].t_name != NULL) {
1736 if (!strcasecmp(str, priorities[i].t_name)) {
1737 *val = priorities[i].t_val;
1745 AP_IMPLEMENT_HOOK_VOID(error_log,
1746 (const char *file, int line, int module_index, int level,
1747 apr_status_t status, const server_rec *s,
1748 const request_rec *r, apr_pool_t *pool,
1749 const char *errstr), (file, line, module_index, level,
1750 status, s, r, pool, errstr))
1752 AP_IMPLEMENT_HOOK_RUN_FIRST(int, generate_log_id,
1753 (const conn_rec *c, const request_rec *r,
1755 (c, r, id), DECLINED)