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apreq-integration
apache/server/log.c
Sander Temme 3233157214 The error logging core only logs at very high level if it has no 
server_rec from which to read the appropriate LogLevel.  Ensure that 
everything gets logged when -DDEBUG is passed to the compiler. 

This makes the server very verbose, on the command line before stderr is 
redirected and in the error log afterwards.  This is appropriate when 
debugging, but not under normal circumstances. 



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@686271 13f79535-47bb-0310-9956-ffa450edef68
2008-08-15 16:11:46 +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
#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_pool_t *stderr_pool = NULL;
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. We let the plog cleanups close the actual pipes.
*/
static apr_status_t clear_handle_list(void *v)
{
read_handles = NULL;
return APR_SUCCESS;
}
/* remember to close this handle in the child process
*
* On Win32 this makes zero sense, because we don't
* take the parent process's child procs.
* If the win32 parent instead passed each and every
* logger write handle from itself down to the child,
* and the parent manages all aspects of keeping the
* reliable pipe log children alive, this would still
* make no sense :) Cripple it on Win32.
*/
static void close_handle_in_child(apr_pool_t *p, apr_file_t *f)
{
#ifndef WIN32
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;
#endif
}
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 (!stderr_pool) {
/* This is safe provided we revert it when we are finished.
* We don't manager the callers pool!
*/
stderr_pool = p;
}
if ((rc = apr_file_open_stderr(&stderr_log, stderr_pool))
== APR_SUCCESS) {
apr_file_flush(stderr_log);
if ((rc = apr_file_dup2(stderr_log, stderr_file, stderr_pool))
== APR_SUCCESS) {
apr_file_close(stderr_file);
/*
* You might ponder why stderr_pool should survive?
* The trouble is, stderr_pool may have s_main->error_log,
* so we aren't in a position to destory stderr_pool until
* the next recycle. There's also an apparent bug which
* is not; if some folk decided to call this function before
* the core open error logs hook, this pool won't survive.
* Neither does the stderr logger, so this isn't a problem.
*/
}
}
/* Revert, see above */
if (stderr_pool == p)
stderr_pool = NULL;
if (rc != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rc, NULL,
"unable to replace stderr with error log file");
}
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)) {
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));
if (dummy_stderr) {
if ((rc = apr_file_open_stdout(&errfile, p)) == APR_SUCCESS)
rc = apr_procattr_child_err_set(procattr, errfile, NULL);
}
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()
*/
}
}
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)
{
apr_pool_t *stderr_p;
server_rec *virt, *q;
int replace_stderr;
/* Register to throw away the read_handles list when we
* cleanup plog. Upon fork() for the apache children,
* this read_handles list is closed so only the parent
* can relaunch a lost log child. These read handles
* are always closed on exec.
* We won't care what happens to our stderr log child
* between log phases, so we don't mind losing stderr's
* read_handle a little bit early.
*/
apr_pool_cleanup_register(p, NULL, clear_handle_list,
apr_pool_cleanup_null);
/* HERE we need a stdout log that outlives plog.
* We *presume* the parent of plog is a process
* or global pool which spans server restarts.
* Create our stderr_pool as a child of the plog's
* parent pool.
*/
apr_pool_create(&stderr_p, apr_pool_parent_get(p));
apr_pool_tag(stderr_p, "stderr_pool");
if (open_error_log(s_main, 1, stderr_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, stderr_p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s_main,
"unable to replace stderr with error_log");
}
else {
/* We are done with stderr_pool, close it, killing
* the previous generation's stderr logger
*/
if (stderr_pool)
apr_pool_destroy(stderr_pool);
stderr_pool = stderr_p;
replace_stderr = 0;
/*
* Now that we have dup'ed s_main->error_log to stderr_log
* close it and set s_main->error_log to stderr_log. This avoids
* this fd being inherited by the next piped logger who would
* keep open the writing end of the pipe that this one uses
* as stdin. This in turn would prevent the piped logger from
* exiting.
*/
apr_file_close(s_main->error_log);
s_main->error_log = stderr_log;
}
}
/* 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
*/
#ifndef DEBUG
if ((level_and_mask != APLOG_NOTICE)
&& (level_and_mask > ap_default_loglevel)) {
return;
}
#endif
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_ex(&ap_piped_log_read_fd(pl),
&ap_piped_log_write_fd(pl),
APR_FULL_BLOCK, 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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