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apache/server/log.c
Joe Orton acd492152e * server/log.c (ap_open_logs): When dup2'ing the error log to stderr, 
use the already-open stderr file object rather than opening a new one.

Submitted by: Tom Donovan <Tom.Donovan acm.org>
PR: 40476


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@467338 13f79535-47bb-0310-9956-ffa450edef68
2006-10-24 14:16:01 +00:00

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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* http_log.c: Dealing with the logs and errors
*
* Rob McCool
*
*/
#include "apr.h"
#include "apr_general.h" /* for signal stuff */
#include "apr_strings.h"
#include "apr_errno.h"
#include "apr_thread_proc.h"
#include "apr_lib.h"
#include "apr_signal.h"
#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include "apr_want.h"
#if APR_HAVE_STDARG_H
#include <stdarg.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#define CORE_PRIVATE
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_main.h"
#include "util_time.h"
#include "ap_mpm.h"
typedef struct {
char *t_name;
int t_val;
} TRANS;
APR_HOOK_STRUCT(
APR_HOOK_LINK(error_log)
)
int AP_DECLARE_DATA ap_default_loglevel = DEFAULT_LOGLEVEL;
#ifdef HAVE_SYSLOG
static const TRANS facilities[] = {
{"auth", LOG_AUTH},
#ifdef LOG_AUTHPRIV
{"authpriv",LOG_AUTHPRIV},
#endif
#ifdef LOG_CRON
{"cron", LOG_CRON},
#endif
#ifdef LOG_DAEMON
{"daemon", LOG_DAEMON},
#endif
#ifdef LOG_FTP
{"ftp", LOG_FTP},
#endif
#ifdef LOG_KERN
{"kern", LOG_KERN},
#endif
#ifdef LOG_LPR
{"lpr", LOG_LPR},
#endif
#ifdef LOG_MAIL
{"mail", LOG_MAIL},
#endif
#ifdef LOG_NEWS
{"news", LOG_NEWS},
#endif
#ifdef LOG_SYSLOG
{"syslog", LOG_SYSLOG},
#endif
#ifdef LOG_USER
{"user", LOG_USER},
#endif
#ifdef LOG_UUCP
{"uucp", LOG_UUCP},
#endif
#ifdef LOG_LOCAL0
{"local0", LOG_LOCAL0},
#endif
#ifdef LOG_LOCAL1
{"local1", LOG_LOCAL1},
#endif
#ifdef LOG_LOCAL2
{"local2", LOG_LOCAL2},
#endif
#ifdef LOG_LOCAL3
{"local3", LOG_LOCAL3},
#endif
#ifdef LOG_LOCAL4
{"local4", LOG_LOCAL4},
#endif
#ifdef LOG_LOCAL5
{"local5", LOG_LOCAL5},
#endif
#ifdef LOG_LOCAL6
{"local6", LOG_LOCAL6},
#endif
#ifdef LOG_LOCAL7
{"local7", LOG_LOCAL7},
#endif
{NULL, -1},
};
#endif
static const TRANS priorities[] = {
{"emerg", APLOG_EMERG},
{"alert", APLOG_ALERT},
{"crit", APLOG_CRIT},
{"error", APLOG_ERR},
{"warn", APLOG_WARNING},
{"notice", APLOG_NOTICE},
{"info", APLOG_INFO},
{"debug", APLOG_DEBUG},
{NULL, -1},
};
static apr_file_t *stderr_log = NULL;
/* track pipe handles to close in child process */
typedef struct read_handle_t {
struct read_handle_t *next;
apr_file_t *handle;
} read_handle_t;
static read_handle_t *read_handles;
/* clear_handle_list() is called when plog is cleared; at that
* point we need to forget about our old list of pipe read
* handles
*/
static apr_status_t clear_handle_list(void *v)
{
read_handles = NULL;
return APR_SUCCESS;
}
/* remember to close this handle in the child process */
static void close_handle_in_child(apr_pool_t *p, apr_file_t *f)
{
read_handle_t *new_handle;
new_handle = apr_pcalloc(p, sizeof(read_handle_t));
new_handle->next = read_handles;
new_handle->handle = f;
read_handles = new_handle;
}
void ap_logs_child_init(apr_pool_t *p, server_rec *s)
{
read_handle_t *cur = read_handles;
while (cur) {
apr_file_close(cur->handle);
cur = cur->next;
}
}
AP_DECLARE(void) ap_open_stderr_log(apr_pool_t *p)
{
apr_file_open_stderr(&stderr_log, p);
}
AP_DECLARE(apr_status_t) ap_replace_stderr_log(apr_pool_t *p,
const char *fname)
{
apr_file_t *stderr_file;
apr_status_t rc;
char *filename = ap_server_root_relative(p, fname);
if (!filename) {
ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT,
APR_EBADPATH, NULL, "Invalid -E error log file %s",
fname);
return APR_EBADPATH;
}
if ((rc = apr_file_open(&stderr_file, filename,
APR_APPEND | APR_WRITE | APR_CREATE | APR_LARGEFILE,
APR_OS_DEFAULT, p)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
"%s: could not open error log file %s.",
ap_server_argv0, fname);
return rc;
}
if ((rc = apr_file_open_stderr(&stderr_log, p)) == APR_SUCCESS) {
apr_file_flush(stderr_log);
if ((rc = apr_file_dup2(stderr_log, stderr_file, p)) == APR_SUCCESS) {
apr_file_close(stderr_file);
}
}
if (rc != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rc, NULL,
"unable to replace stderr with error_log");
}
return rc;
}
static void log_child_errfn(apr_pool_t *pool, apr_status_t err,
const char *description)
{
ap_log_error(APLOG_MARK, APLOG_ERR, err, NULL,
"%s", description);
}
/* Create a child process running PROGNAME with a pipe connected to
* the childs stdin. The write-end of the pipe will be placed in
* *FPIN on successful return. If dummy_stderr is non-zero, the
* stderr for the child will be the same as the stdout of the parent.
* Otherwise the child will inherit the stderr from the parent. */
static int log_child(apr_pool_t *p, const char *progname,
apr_file_t **fpin, int dummy_stderr)
{
/* Child process code for 'ErrorLog "|..."';
* may want a common framework for this, since I expect it will
* be common for other foo-loggers to want this sort of thing...
*/
apr_status_t rc;
apr_procattr_t *procattr;
apr_proc_t *procnew;
apr_file_t *errfile;
if (((rc = apr_procattr_create(&procattr, p)) == APR_SUCCESS)
&& ((rc = apr_procattr_cmdtype_set(procattr,
APR_SHELLCMD_ENV)) == APR_SUCCESS)
&& ((rc = apr_procattr_io_set(procattr,
APR_FULL_BLOCK,
APR_NO_PIPE,
APR_NO_PIPE)) == APR_SUCCESS)
&& ((rc = apr_procattr_error_check_set(procattr, 1)) == APR_SUCCESS)
&& ((rc = apr_procattr_child_errfn_set(procattr, log_child_errfn)) == APR_SUCCESS)
&& (!dummy_stderr
|| ((rc = apr_file_open_stdout(&errfile, p)) == APR_SUCCESS
&& (rc = apr_procattr_child_err_set(procattr,
errfile,
errfile)) == APR_SUCCESS))) {
char **args;
const char *pname;
apr_tokenize_to_argv(progname, &args, p);
pname = apr_pstrdup(p, args[0]);
procnew = (apr_proc_t *)apr_pcalloc(p, sizeof(*procnew));
rc = apr_proc_create(procnew, pname, (const char * const *)args,
NULL, procattr, p);
if (rc == APR_SUCCESS) {
apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
(*fpin) = procnew->in;
/* read handle to pipe not kept open, so no need to call
* close_handle_in_child()
*/
}
/* apr_procattr_child_err_set dups errfile twice: close the
* remaining "parent-side" copy (apr_proc_create closes the
* other). */
if (dummy_stderr) {
apr_file_close(procnew->err);
}
}
return rc;
}
/* Open the error log for the given server_rec. If IS_MAIN is
* non-zero, s is the main server. */
static int open_error_log(server_rec *s, int is_main, apr_pool_t *p)
{
const char *fname;
int rc;
if (*s->error_fname == '|') {
apr_file_t *dummy = NULL;
/* Spawn a new child logger. If this is the main server_rec,
* the new child must use a dummy stderr since the current
* stderr might be a pipe to the old logger. Otherwise, the
* child inherits the parents stderr. */
rc = log_child(p, s->error_fname + 1, &dummy, is_main);
if (rc != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
"Couldn't start ErrorLog process");
return DONE;
}
s->error_log = dummy;
}
#ifdef HAVE_SYSLOG
else if (!strncasecmp(s->error_fname, "syslog", 6)) {
if ((fname = strchr(s->error_fname, ':'))) {
const TRANS *fac;
fname++;
for (fac = facilities; fac->t_name; fac++) {
if (!strcasecmp(fname, fac->t_name)) {
openlog(ap_server_argv0, LOG_NDELAY|LOG_CONS|LOG_PID,
fac->t_val);
s->error_log = NULL;
return OK;
}
}
}
else {
openlog(ap_server_argv0, LOG_NDELAY|LOG_CONS|LOG_PID, LOG_LOCAL7);
}
s->error_log = NULL;
}
#endif
else {
fname = ap_server_root_relative(p, s->error_fname);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EBADPATH, NULL,
"%s: Invalid error log path %s.",
ap_server_argv0, s->error_fname);
return DONE;
}
if ((rc = apr_file_open(&s->error_log, fname,
APR_APPEND | APR_WRITE | APR_CREATE | APR_LARGEFILE,
APR_OS_DEFAULT, p)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
"%s: could not open error log file %s.",
ap_server_argv0, fname);
return DONE;
}
}
return OK;
}
int ap_open_logs(apr_pool_t *pconf, apr_pool_t *p /* plog */,
apr_pool_t *ptemp, server_rec *s_main)
{
server_rec *virt, *q;
int replace_stderr;
apr_pool_cleanup_register(p, NULL, clear_handle_list,
apr_pool_cleanup_null);
if (open_error_log(s_main, 1, p) != OK) {
return DONE;
}
replace_stderr = 1;
if (s_main->error_log) {
apr_status_t rv;
/* Replace existing stderr with new log. */
apr_file_flush(s_main->error_log);
rv = apr_file_dup2(stderr_log, s_main->error_log, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s_main,
"unable to replace stderr with error_log");
}
else {
replace_stderr = 0;
}
}
/* note that stderr may still need to be replaced with something
* because it points to the old error log, or back to the tty
* of the submitter.
* XXX: This is BS - /dev/null is non-portable
*/
if (replace_stderr && freopen("/dev/null", "w", stderr) == NULL) {
ap_log_error(APLOG_MARK, APLOG_CRIT, errno, s_main,
"unable to replace stderr with /dev/null");
}
for (virt = s_main->next; virt; virt = virt->next) {
if (virt->error_fname) {
for (q=s_main; q != virt; q = q->next) {
if (q->error_fname != NULL
&& strcmp(q->error_fname, virt->error_fname) == 0) {
break;
}
}
if (q == virt) {
if (open_error_log(virt, 0, p) != OK) {
return DONE;
}
}
else {
virt->error_log = q->error_log;
}
}
else {
virt->error_log = s_main->error_log;
}
}
return OK;
}
AP_DECLARE(void) ap_error_log2stderr(server_rec *s) {
apr_file_t *errfile = NULL;
apr_file_open_stderr(&errfile, s->process->pool);
if (s->error_log != NULL) {
apr_file_dup2(s->error_log, errfile, s->process->pool);
}
}
static void log_error_core(const char *file, int line, int level,
apr_status_t status, const server_rec *s,
const conn_rec *c,
const request_rec *r, apr_pool_t *pool,
const char *fmt, va_list args)
{
char errstr[MAX_STRING_LEN];
#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
char scratch[MAX_STRING_LEN];
#endif
apr_size_t len, errstrlen;
apr_file_t *logf = NULL;
const char *referer;
int level_and_mask = level & APLOG_LEVELMASK;
if (r && r->connection) {
c = r->connection;
}
if (s == NULL) {
/*
* If we are doing stderr logging (startup), don't log messages that are
* above the default server log level unless it is a startup/shutdown
* notice
*/
if ((level_and_mask != APLOG_NOTICE)
&& (level_and_mask > ap_default_loglevel)) {
return;
}
logf = stderr_log;
}
else if (s->error_log) {
/*
* If we are doing normal logging, don't log messages that are
* above the server log level unless it is a startup/shutdown notice
*/
if ((level_and_mask != APLOG_NOTICE)
&& (level_and_mask > s->loglevel)) {
return;
}
logf = s->error_log;
}
#ifdef TPF
else if (tpf_child) {
/*
* If we are doing normal logging, don't log messages that are
* above the server log level unless it is a startup/shutdown notice
*/
if ((level_and_mask != APLOG_NOTICE)
&& (level_and_mask > s->loglevel)) {
return;
}
logf = stderr;
}
#endif /* TPF */
else {
/*
* If we are doing syslog logging, don't log messages that are
* above the server log level (including a startup/shutdown notice)
*/
if (level_and_mask > s->loglevel) {
return;
}
}
if (logf && ((level & APLOG_STARTUP) != APLOG_STARTUP)) {
errstr[0] = '[';
ap_recent_ctime(errstr + 1, apr_time_now());
errstr[1 + APR_CTIME_LEN - 1] = ']';
errstr[1 + APR_CTIME_LEN ] = ' ';
len = 1 + APR_CTIME_LEN + 1;
} else {
len = 0;
}
if ((level & APLOG_STARTUP) != APLOG_STARTUP) {
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"[%s] ", priorities[level_and_mask].t_name);
}
#ifndef TPF
if (file && level_and_mask == APLOG_DEBUG) {
#if defined(_OSD_POSIX) || defined(WIN32) || defined(__MVS__)
char tmp[256];
char *e = strrchr(file, '/');
#ifdef WIN32
if (!e) {
e = strrchr(file, '\\');
}
#endif
/* In OSD/POSIX, the compiler returns for __FILE__
* a string like: __FILE__="*POSIX(/usr/include/stdio.h)"
* (it even returns an absolute path for sources in
* the current directory). Here we try to strip this
* down to the basename.
*/
if (e != NULL && e[1] != '\0') {
apr_snprintf(tmp, sizeof(tmp), "%s", &e[1]);
e = &tmp[strlen(tmp)-1];
if (*e == ')') {
*e = '\0';
}
file = tmp;
}
#else /* _OSD_POSIX || WIN32 */
const char *p;
/* On Unix, __FILE__ may be an absolute path in a
* VPATH build. */
if (file[0] == '/' && (p = ap_strrchr_c(file, '/')) != NULL) {
file = p + 1;
}
#endif /*_OSD_POSIX || WIN32 */
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"%s(%d): ", file, line);
}
#endif /* TPF */
if (c) {
/* XXX: TODO: add a method of selecting whether logged client
* addresses are in dotted quad or resolved form... dotted
* quad is the most secure, which is why I'm implementing it
* first. -djg
*/
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"[client %s] ", c->remote_ip);
}
if (status != 0) {
if (status < APR_OS_START_EAIERR) {
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"(%d)", status);
}
else if (status < APR_OS_START_SYSERR) {
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"(EAI %d)", status - APR_OS_START_EAIERR);
}
else if (status < 100000 + APR_OS_START_SYSERR) {
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"(OS %d)", status - APR_OS_START_SYSERR);
}
else {
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
"(os 0x%08x)", status - APR_OS_START_SYSERR);
}
apr_strerror(status, errstr + len, MAX_STRING_LEN - len);
len += strlen(errstr + len);
if (MAX_STRING_LEN - len > 2) {
errstr[len++] = ':';
errstr[len++] = ' ';
errstr[len] = '\0';
}
}
errstrlen = len;
#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
if (apr_vsnprintf(scratch, MAX_STRING_LEN - len, fmt, args)) {
len += ap_escape_errorlog_item(errstr + len, scratch,
MAX_STRING_LEN - len);
}
#else
len += apr_vsnprintf(errstr + len, MAX_STRING_LEN - len, fmt, args);
#endif
if ( r && (referer = apr_table_get(r->headers_in, "Referer"))
#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
&& ap_escape_errorlog_item(scratch, referer, MAX_STRING_LEN - len)
#endif
) {
len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
", referer: %s",
#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
scratch
#else
referer
#endif
);
}
/* NULL if we are logging to syslog */
if (logf) {
/* Truncate for the terminator (as apr_snprintf does) */
if (len > MAX_STRING_LEN - sizeof(APR_EOL_STR)) {
len = MAX_STRING_LEN - sizeof(APR_EOL_STR);
}
strcpy(errstr + len, APR_EOL_STR);
apr_file_puts(errstr, logf);
apr_file_flush(logf);
}
#ifdef HAVE_SYSLOG
else {
syslog(level_and_mask, "%s", errstr);
}
#endif
ap_run_error_log(file, line, level, status, s, r, pool, errstr + errstrlen);
}
AP_DECLARE(void) ap_log_error(const char *file, int line, int level,
apr_status_t status, const server_rec *s,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
log_error_core(file, line, level, status, s, NULL, NULL, NULL, fmt, args);
va_end(args);
}
AP_DECLARE(void) ap_log_perror(const char *file, int line, int level,
apr_status_t status, apr_pool_t *p,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
log_error_core(file, line, level, status, NULL, NULL, NULL, p, fmt, args);
va_end(args);
}
AP_DECLARE(void) ap_log_rerror(const char *file, int line, int level,
apr_status_t status, const request_rec *r,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
log_error_core(file, line, level, status, r->server, NULL, r, NULL, fmt,
args);
/*
* IF APLOG_TOCLIENT is set,
* AND the error level is 'warning' or more severe,
* AND there isn't already error text associated with this request,
* THEN make the message text available to ErrorDocument and
* other error processors.
*/
va_end(args);
va_start(args,fmt);
if ((level & APLOG_TOCLIENT)
&& ((level & APLOG_LEVELMASK) <= APLOG_WARNING)
&& (apr_table_get(r->notes, "error-notes") == NULL)) {
apr_table_setn(r->notes, "error-notes",
ap_escape_html(r->pool, apr_pvsprintf(r->pool, fmt,
args)));
}
va_end(args);
}
AP_DECLARE(void) ap_log_cerror(const char *file, int line, int level,
apr_status_t status, const conn_rec *c,
const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
log_error_core(file, line, level, status, c->base_server, c, NULL, NULL,
fmt, args);
va_end(args);
}
AP_DECLARE(void) ap_log_pid(apr_pool_t *p, const char *filename)
{
apr_file_t *pid_file = NULL;
apr_finfo_t finfo;
static pid_t saved_pid = -1;
pid_t mypid;
apr_status_t rv;
const char *fname;
if (!filename) {
return;
}
fname = ap_server_root_relative(p, filename);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, APR_EBADPATH,
NULL, "Invalid PID file path %s, ignoring.", filename);
return;
}
mypid = getpid();
if (mypid != saved_pid
&& apr_stat(&finfo, fname, APR_FINFO_MTIME, p) == APR_SUCCESS) {
/* AP_SIG_GRACEFUL and HUP call this on each restart.
* Only warn on first time through for this pid.
*
* XXX: Could just write first time through too, although
* that may screw up scripts written to do something
* based on the last modification time of the pid file.
*/
ap_log_perror(APLOG_MARK, APLOG_WARNING, 0, p,
"pid file %s overwritten -- Unclean "
"shutdown of previous Apache run?",
fname);
}
if ((rv = apr_file_open(&pid_file, fname,
APR_WRITE | APR_CREATE | APR_TRUNCATE,
APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD, p))
!= APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL,
"could not create %s", fname);
ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
"%s: could not log pid to file %s",
ap_server_argv0, fname);
exit(1);
}
apr_file_printf(pid_file, "%ld" APR_EOL_STR, (long)mypid);
apr_file_close(pid_file);
saved_pid = mypid;
}
AP_DECLARE(apr_status_t) ap_read_pid(apr_pool_t *p, const char *filename,
pid_t *mypid)
{
const apr_size_t BUFFER_SIZE = sizeof(long) * 3 + 2; /* see apr_ltoa */
apr_file_t *pid_file = NULL;
apr_status_t rv;
const char *fname;
char *buf, *endptr;
apr_size_t bytes_read;
if (!filename) {
return APR_EGENERAL;
}
fname = ap_server_root_relative(p, filename);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, APR_EBADPATH,
NULL, "Invalid PID file path %s, ignoring.", filename);
return APR_EGENERAL;
}
rv = apr_file_open(&pid_file, fname, APR_READ, APR_OS_DEFAULT, p);
if (rv != APR_SUCCESS) {
return rv;
}
buf = apr_palloc(p, BUFFER_SIZE);
rv = apr_file_read_full(pid_file, buf, BUFFER_SIZE - 1, &bytes_read);
if (rv != APR_SUCCESS && rv != APR_EOF) {
return rv;
}
/* If we fill the buffer, we're probably reading a corrupt pid file.
* To be nice, let's also ensure the first char is a digit. */
if (bytes_read == 0 || bytes_read == BUFFER_SIZE - 1 || !apr_isdigit(*buf)) {
return APR_EGENERAL;
}
buf[bytes_read] = '\0';
*mypid = strtol(buf, &endptr, 10);
apr_file_close(pid_file);
return APR_SUCCESS;
}
AP_DECLARE(void) ap_log_assert(const char *szExp, const char *szFile,
int nLine)
{
char time_str[APR_CTIME_LEN];
apr_ctime(time_str, apr_time_now());
ap_log_error(APLOG_MARK, APLOG_CRIT, 0, NULL,
"[%s] file %s, line %d, assertion \"%s\" failed",
time_str, szFile, nLine, szExp);
#if defined(WIN32)
DebugBreak();
#else
/* unix assert does an abort leading to a core dump */
abort();
#endif
}
/* piped log support */
#ifdef AP_HAVE_RELIABLE_PIPED_LOGS
/* forward declaration */
static void piped_log_maintenance(int reason, void *data, apr_wait_t status);
/* Spawn the piped logger process pl->program. */
static apr_status_t piped_log_spawn(piped_log *pl)
{
apr_procattr_t *procattr;
apr_proc_t *procnew = NULL;
apr_status_t status;
if (((status = apr_procattr_create(&procattr, pl->p)) != APR_SUCCESS) ||
((status = apr_procattr_cmdtype_set(procattr,
APR_SHELLCMD_ENV)) != APR_SUCCESS) ||
((status = apr_procattr_child_in_set(procattr,
ap_piped_log_read_fd(pl),
ap_piped_log_write_fd(pl)))
!= APR_SUCCESS) ||
((status = apr_procattr_child_errfn_set(procattr, log_child_errfn))
!= APR_SUCCESS) ||
((status = apr_procattr_error_check_set(procattr, 1)) != APR_SUCCESS)) {
char buf[120];
/* Something bad happened, give up and go away. */
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"piped_log_spawn: unable to setup child process '%s': %s",
pl->program, apr_strerror(status, buf, sizeof(buf)));
}
else {
char **args;
const char *pname;
apr_tokenize_to_argv(pl->program, &args, pl->p);
pname = apr_pstrdup(pl->p, args[0]);
procnew = apr_pcalloc(pl->p, sizeof(apr_proc_t));
status = apr_proc_create(procnew, pname, (const char * const *) args,
NULL, procattr, pl->p);
if (status == APR_SUCCESS) {
pl->pid = procnew;
/* procnew->in was dup2'd from ap_piped_log_write_fd(pl);
* since the original fd is still valid, close the copy to
* avoid a leak. */
apr_file_close(procnew->in);
procnew->in = NULL;
apr_proc_other_child_register(procnew, piped_log_maintenance, pl,
ap_piped_log_write_fd(pl), pl->p);
close_handle_in_child(pl->p, ap_piped_log_read_fd(pl));
}
else {
char buf[120];
/* Something bad happened, give up and go away. */
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"unable to start piped log program '%s': %s",
pl->program, apr_strerror(status, buf, sizeof(buf)));
}
}
return status;
}
static void piped_log_maintenance(int reason, void *data, apr_wait_t status)
{
piped_log *pl = data;
apr_status_t stats;
int mpm_state;
switch (reason) {
case APR_OC_REASON_DEATH:
case APR_OC_REASON_LOST:
pl->pid = NULL; /* in case we don't get it going again, this
* tells other logic not to try to kill it
*/
apr_proc_other_child_unregister(pl);
stats = ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state);
if (stats != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"can't query MPM state; not restarting "
"piped log program '%s'",
pl->program);
}
else if (mpm_state != AP_MPMQ_STOPPING) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"piped log program '%s' failed unexpectedly",
pl->program);
if ((stats = piped_log_spawn(pl)) != APR_SUCCESS) {
/* what can we do? This could be the error log we're having
* problems opening up... */
char buf[120];
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"piped_log_maintenance: unable to respawn '%s': %s",
pl->program, apr_strerror(stats, buf, sizeof(buf)));
}
}
break;
case APR_OC_REASON_UNWRITABLE:
/* We should not kill off the pipe here, since it may only be full.
* If it really is locked, we should kill it off manually. */
break;
case APR_OC_REASON_RESTART:
if (pl->pid != NULL) {
apr_proc_kill(pl->pid, SIGTERM);
pl->pid = NULL;
}
break;
case APR_OC_REASON_UNREGISTER:
break;
}
}
static apr_status_t piped_log_cleanup_for_exec(void *data)
{
piped_log *pl = data;
apr_file_close(ap_piped_log_read_fd(pl));
apr_file_close(ap_piped_log_write_fd(pl));
return APR_SUCCESS;
}
static apr_status_t piped_log_cleanup(void *data)
{
piped_log *pl = data;
if (pl->pid != NULL) {
apr_proc_kill(pl->pid, SIGTERM);
}
return piped_log_cleanup_for_exec(data);
}
AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p, const char *program)
{
piped_log *pl;
pl = apr_palloc(p, sizeof (*pl));
pl->p = p;
pl->program = apr_pstrdup(p, program);
pl->pid = NULL;
if (apr_file_pipe_create(&ap_piped_log_read_fd(pl),
&ap_piped_log_write_fd(pl), p) != APR_SUCCESS) {
return NULL;
}
apr_pool_cleanup_register(p, pl, piped_log_cleanup,
piped_log_cleanup_for_exec);
if (piped_log_spawn(pl) != APR_SUCCESS) {
apr_pool_cleanup_kill(p, pl, piped_log_cleanup);
apr_file_close(ap_piped_log_read_fd(pl));
apr_file_close(ap_piped_log_write_fd(pl));
return NULL;
}
return pl;
}
#else /* !AP_HAVE_RELIABLE_PIPED_LOGS */
static apr_status_t piped_log_cleanup(void *data)
{
piped_log *pl = data;
apr_file_close(ap_piped_log_write_fd(pl));
return APR_SUCCESS;
}
AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p, const char *program)
{
piped_log *pl;
apr_file_t *dummy = NULL;
int rc;
rc = log_child(p, program, &dummy, 0);
if (rc != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
"Couldn't start piped log process");
return NULL;
}
pl = apr_palloc(p, sizeof (*pl));
pl->p = p;
ap_piped_log_read_fd(pl) = NULL;
ap_piped_log_write_fd(pl) = dummy;
apr_pool_cleanup_register(p, pl, piped_log_cleanup, piped_log_cleanup);
return pl;
}
#endif
AP_DECLARE(void) ap_close_piped_log(piped_log *pl)
{
apr_pool_cleanup_run(pl->p, pl, piped_log_cleanup);
}
AP_IMPLEMENT_HOOK_VOID(error_log,
(const char *file, int line, int level,
apr_status_t status, const server_rec *s,
const request_rec *r, apr_pool_t *pool,
const char *errstr), (file, line, level,
status, s, r, pool, errstr))
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