Adding upstream version 2.4.58.upstream/2.4.58

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2001 insertions, 0 deletions

diff --git a/server/log.c b/server/log.c
new file mode 100644
index 0000000..dae94e6
--- /dev/null
+++ b/server/log.c
@@ -0,0 +1,2001 @@
+/* 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"
+#include "apr_portable.h"
+#include "apr_base64.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
+#if APR_HAVE_PROCESS_H
+#include <process.h>            /* for getpid() on Win32 */
+#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"
+#include "ap_listen.h"
+
+#if HAVE_GETTID
+#include <sys/syscall.h>
+#include <sys/types.h>
+#endif
+
+/* we know core's module_index is 0 */
+#undef APLOG_MODULE_INDEX
+#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX
+
+typedef struct {
+    const char *t_name;
+    int t_val;
+} TRANS;
+
+APR_HOOK_STRUCT(
+    APR_HOOK_LINK(error_log)
+    APR_HOOK_LINK(generate_log_id)
+)
+
+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},
+    {"trace1",  APLOG_TRACE1},
+    {"trace2",  APLOG_TRACE2},
+    {"trace3",  APLOG_TRACE3},
+    {"trace4",  APLOG_TRACE4},
+    {"trace5",  APLOG_TRACE5},
+    {"trace6",  APLOG_TRACE6},
+    {"trace7",  APLOG_TRACE7},
+    {"trace8",  APLOG_TRACE8},
+    {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;
+
+/**
+ * @brief The piped logging structure.
+ *
+ * Piped logs are used to move functionality out of the main server.
+ * For example, log rotation is done with piped logs.
+ */
+struct piped_log {
+    /** The pool to use for the piped log */
+    apr_pool_t *p;
+    /** The pipe between the server and the logging process */
+    apr_file_t *read_fd, *write_fd;
+#ifdef AP_HAVE_RELIABLE_PIPED_LOGS
+    /** The name of the program the logging process is running */
+    char *program;
+    /** The pid of the logging process */
+    apr_proc_t *pid;
+    /** How to reinvoke program when it must be replaced */
+    apr_cmdtype_e cmdtype;
+#endif
+};
+
+AP_DECLARE(apr_file_t *) ap_piped_log_read_fd(piped_log *pl)
+{
+    return pl->read_fd;
+}
+
+AP_DECLARE(apr_file_t *) ap_piped_log_write_fd(piped_log *pl)
+{
+    return pl->write_fd;
+}
+
+/* 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, ap_server_conf, APLOGNO(00085) "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, ap_server_conf, APLOGNO(00086)
+                     "%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 destroy 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, APLOGNO(00087)
+                     "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, APLOGNO(00088)
+                 "%s", description);
+}
+
+/* Create a child process running PROGNAME with a pipe connected to
+ * the child's 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, apr_cmdtype_e cmdtype,
+                     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_dir_set(procattr,
+                                       ap_server_root)) == APR_SUCCESS)
+        && ((rc = apr_procattr_cmdtype_set(procattr, cmdtype)) == 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;
+
+        apr_tokenize_to_argv(progname, &args, p);
+        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);
+        }
+
+        if (rc == APR_SUCCESS) {
+            rc = apr_proc_create(procnew, args[0], (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;
+        apr_cmdtype_e cmdtype = APR_PROGRAM_ENV;
+        fname = s->error_fname + 1;
+
+        /* In 2.4 favor PROGRAM_ENV, accept "||prog" syntax for compatibility
+         * and "|$cmd" to override the default.
+         * Any 2.2 backport would continue to favor SHELLCMD_ENV so there
+         * accept "||prog" to override, and "|$cmd" to ease conversion.
+         */
+        if (*fname == '|')
+            ++fname;
+        if (*fname == '$') {
+            cmdtype = APR_SHELLCMD_ENV;
+            ++fname;
+        }
+
+        /* 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, fname, &dummy, cmdtype, is_main);
+        if (rc != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, ap_server_conf, APLOGNO(00089)
+                         "Couldn't start ErrorLog process '%s'.",
+                         s->error_fname + 1);
+            return DONE;
+        }
+
+        s->error_log = dummy;
+    }
+
+#ifdef HAVE_SYSLOG
+    else if (strcmp(s->error_fname, "syslog") == 0
+             || strncmp(s->error_fname, "syslog:", 7) == 0) {
+        if ((fname = strchr(s->error_fname, ':'))) {
+            /* s->error_fname could be [level]:[tag] (see #60525) */
+            const char *tag;
+            apr_size_t flen;
+            const TRANS *fac;
+
+            fname++;
+            tag = ap_strchr_c(fname, ':');
+            if (tag) {
+                flen = tag - fname;
+                tag++;
+                if (*tag == '\0') {
+                    tag = ap_server_argv0;
+                }
+            } else {
+                flen = strlen(fname);
+                tag = ap_server_argv0;
+            }
+            if (flen == 0) {
+                /* Was something like syslog::foobar */
+                openlog(tag, LOG_NDELAY|LOG_CONS|LOG_PID, LOG_LOCAL7);
+            } else {
+                for (fac = facilities; fac->t_name; fac++) {
+                    if (!strncasecmp(fname, fac->t_name, flen)) {
+                        openlog(tag, LOG_NDELAY|LOG_CONS|LOG_PID,
+                                fac->t_val);
+                        s->error_log = NULL;
+                        return OK;
+                    }
+                }
+                /* Huh? Invalid level name? */
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, APR_EBADPATH, NULL, APLOGNO(10036)
+                             "%s: could not open syslog error log %s.",
+                              ap_server_argv0, fname);
+                return DONE;
+            }
+        }
+        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, ap_server_conf, APLOGNO(00090)
+                         "%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, ap_server_conf, APLOGNO(00091)
+                         "%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, &read_handles, ap_pool_cleanup_set_null,
+                              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, APLOGNO(00092)
+                         "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
+     *      errno-as-apr_status_t is also non-portable
+     */
+
+#ifdef WIN32
+#define NULL_DEVICE "nul"
+#else
+#define NULL_DEVICE "/dev/null"
+#endif
+
+    if (replace_stderr && freopen(NULL_DEVICE, "w", stderr) == NULL) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, errno, s_main, APLOGNO(00093)
+                     "unable to replace stderr with %s", NULL_DEVICE);
+    }
+
+    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 int cpystrn(char *buf, const char *arg, int buflen)
+{
+    char *end;
+    if (!arg)
+        return 0;
+    end = apr_cpystrn(buf, arg, buflen);
+    return end - buf;
+}
+
+
+static int log_remote_address(const ap_errorlog_info *info, const char *arg,
+                              char *buf, int buflen)
+{
+    if (info->r && !(arg && *arg == 'c'))
+        return apr_snprintf(buf, buflen, "%s:%d", info->r->useragent_ip,
+                            info->r->useragent_addr ? info->r->useragent_addr->port : 0);
+    else if (info->c)
+        return apr_snprintf(buf, buflen, "%s:%d", info->c->client_ip,
+                            info->c->client_addr ? info->c->client_addr->port : 0);
+    else
+        return 0;
+}
+
+static int log_local_address(const ap_errorlog_info *info, const char *arg,
+                             char *buf, int buflen)
+{
+    if (info->c)
+        return apr_snprintf(buf, buflen, "%s:%d", info->c->local_ip,
+                            info->c->local_addr->port);
+    else
+        return 0;
+}
+
+static int log_pid(const ap_errorlog_info *info, const char *arg,
+                   char *buf, int buflen)
+{
+    pid_t pid = getpid();
+    return apr_snprintf(buf, buflen, "%" APR_PID_T_FMT, pid);
+}
+
+static int log_tid(const ap_errorlog_info *info, const char *arg,
+                   char *buf, int buflen)
+{
+#if APR_HAS_THREADS
+    int result;
+#endif
+#if HAVE_GETTID
+    if (arg && *arg == 'g') {
+        pid_t tid = syscall(SYS_gettid);
+        if (tid == -1)
+            return 0;
+        return apr_snprintf(buf, buflen, "%"APR_PID_T_FMT, tid);
+    }
+#endif
+#if APR_HAS_THREADS
+    if (ap_mpm_query(AP_MPMQ_IS_THREADED, &result) == APR_SUCCESS
+        && result != AP_MPMQ_NOT_SUPPORTED)
+    {
+        apr_os_thread_t tid = apr_os_thread_current();
+        return apr_snprintf(buf, buflen, "%pT", &tid);
+    }
+#endif
+    return 0;
+}
+
+static int log_ctime(const ap_errorlog_info *info, const char *arg,
+                     char *buf, int buflen)
+{
+    int time_len = buflen;
+    int option = AP_CTIME_OPTION_NONE;
+
+    if (arg) {
+        if (arg[0] == 'u' && !arg[1]) { /* no ErrorLogFormat (fast path) */
+            option |= AP_CTIME_OPTION_USEC;
+        }
+        else if (!ap_strchr_c(arg, '%')) { /* special "%{cuz}t" formats */
+            while (*arg) {
+                switch (*arg++) {
+                case 'u':
+                    option |= AP_CTIME_OPTION_USEC;
+                    break;
+                case 'c':
+                    option |= AP_CTIME_OPTION_COMPACT;
+                    break;
+                case 'z':
+                    option |= AP_CTIME_OPTION_GMTOFF;
+                    break;
+                }
+            }
+        }
+        else { /* "%{strftime %-format}t" */
+            apr_size_t len = 0;
+            apr_time_exp_t expt;
+            ap_explode_recent_localtime(&expt, apr_time_now());
+            apr_strftime(buf, &len, buflen, arg, &expt);
+            return (int)len;
+        }
+    }
+
+    ap_recent_ctime_ex(buf, apr_time_now(), option, &time_len);
+
+    /* ap_recent_ctime_ex includes the trailing \0 in time_len */
+    return time_len - 1;
+}
+
+static int log_loglevel(const ap_errorlog_info *info, const char *arg,
+                        char *buf, int buflen)
+{
+    if (info->level < 0)
+        return 0;
+    else
+        return cpystrn(buf, priorities[info->level].t_name, buflen);
+}
+
+static int log_log_id(const ap_errorlog_info *info, const char *arg,
+                      char *buf, int buflen)
+{
+    /*
+     * C: log conn log_id if available,
+     * c: log conn log id if available and not a once-per-request log line
+     * else: log request log id if available
+     */
+    if (arg && !strcasecmp(arg, "c")) {
+        if (info->c && (*arg != 'C' || !info->r)) {
+            return cpystrn(buf, info->c->log_id, buflen);
+        }
+    }
+    else if (info->rmain) {
+        return cpystrn(buf, info->rmain->log_id, buflen);
+    }
+    return 0;
+}
+
+static int log_keepalives(const ap_errorlog_info *info, const char *arg,
+                          char *buf, int buflen)
+{
+    if (!info->c)
+        return 0;
+
+    return apr_snprintf(buf, buflen, "%d", info->c->keepalives);
+}
+
+static int log_module_name(const ap_errorlog_info *info, const char *arg,
+                           char *buf, int buflen)
+{
+    return cpystrn(buf, ap_find_module_short_name(info->module_index), buflen);
+}
+
+static int log_file_line(const ap_errorlog_info *info, const char *arg,
+                         char *buf, int buflen)
+{
+    if (info->file == NULL) {
+        return 0;
+    }
+    else {
+        const char *file = info->file;
+#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 */
+        return apr_snprintf(buf, buflen, "%s(%d)", file, info->line);
+    }
+}
+
+static int log_apr_status(const ap_errorlog_info *info, const char *arg,
+                          char *buf, int buflen)
+{
+    apr_status_t status = info->status;
+    int len;
+    if (!status)
+        return 0;
+
+    if (status < APR_OS_START_EAIERR) {
+        len = apr_snprintf(buf, buflen, "(%d)", status);
+    }
+    else if (status < APR_OS_START_SYSERR) {
+        len = apr_snprintf(buf, buflen, "(EAI %d)",
+                           status - APR_OS_START_EAIERR);
+    }
+    else if (status < 100000 + APR_OS_START_SYSERR) {
+        len = apr_snprintf(buf, buflen, "(OS %d)",
+                           status - APR_OS_START_SYSERR);
+    }
+    else {
+        len = apr_snprintf(buf, buflen, "(os 0x%08x)",
+                           status - APR_OS_START_SYSERR);
+    }
+    apr_strerror(status, buf + len, buflen - len);
+    len += strlen(buf + len);
+    return len;
+}
+
+static int log_server_name(const ap_errorlog_info *info, const char *arg,
+                           char *buf, int buflen)
+{
+    if (info->r)
+        return cpystrn(buf, ap_get_server_name((request_rec *)info->r), buflen);
+
+    return 0;
+}
+
+static int log_virtual_host(const ap_errorlog_info *info, const char *arg,
+                            char *buf, int buflen)
+{
+    if (info->s)
+        return cpystrn(buf, info->s->server_hostname, buflen);
+
+    return 0;
+}
+
+
+static int log_table_entry(const apr_table_t *table, const char *name,
+                           char *buf, int buflen)
+{
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+    const char *value;
+    char scratch[MAX_STRING_LEN];
+
+    if ((value = apr_table_get(table, name)) != NULL) {
+        ap_escape_errorlog_item(scratch, value, MAX_STRING_LEN);
+        return cpystrn(buf, scratch, buflen);
+    }
+
+    return 0;
+#else
+    return cpystrn(buf, apr_table_get(table, name), buflen);
+#endif
+}
+
+static int log_header(const ap_errorlog_info *info, const char *arg,
+                      char *buf, int buflen)
+{
+    if (info->r)
+        return log_table_entry(info->r->headers_in, arg, buf, buflen);
+
+    return 0;
+}
+
+static int log_note(const ap_errorlog_info *info, const char *arg,
+                      char *buf, int buflen)
+{
+    /* XXX: maybe escaping the entry is not necessary for notes? */
+    if (info->r)
+        return log_table_entry(info->r->notes, arg, buf, buflen);
+
+    return 0;
+}
+
+static int log_env_var(const ap_errorlog_info *info, const char *arg,
+                      char *buf, int buflen)
+{
+    if (info->r)
+        return log_table_entry(info->r->subprocess_env, arg, buf, buflen);
+
+    return 0;
+}
+
+static int core_generate_log_id(const conn_rec *c, const request_rec *r,
+                                 const char **idstring)
+{
+    apr_uint64_t id, tmp;
+    pid_t pid;
+    int len;
+    char *encoded;
+
+    if (r && r->request_time) {
+        id = (apr_uint64_t)r->request_time;
+    }
+    else {
+        id = (apr_uint64_t)apr_time_now();
+    }
+
+    pid = getpid();
+    if (sizeof(pid_t) > 2) {
+        tmp = pid;
+        tmp = tmp << 40;
+        id ^= tmp;
+        pid = pid >> 24;
+        tmp = pid;
+        tmp = tmp << 56;
+        id ^= tmp;
+    }
+    else {
+        tmp = pid;
+        tmp = tmp << 40;
+        id ^= tmp;
+    }
+#if APR_HAS_THREADS
+    {
+        apr_uintptr_t tmp2 = (apr_uintptr_t)c->current_thread;
+        tmp = tmp2;
+        tmp = tmp << 32;
+        id ^= tmp;
+    }
+#endif
+
+    len = apr_base64_encode_len(sizeof(id)); /* includes trailing \0 */
+    encoded = apr_palloc(r ? r->pool : c->pool, len);
+    apr_base64_encode(encoded, (char *)&id, sizeof(id));
+
+    /* Skip the last char, it is always '=' */
+    encoded[len - 2] = '\0';
+
+    *idstring = encoded;
+
+    return OK;
+}
+
+static void add_log_id(const conn_rec *c, const request_rec *r)
+{
+    const char **id;
+    /* need to cast const away */
+    if (r) {
+        id = &((request_rec *)r)->log_id;
+    }
+    else {
+        id = &((conn_rec *)c)->log_id;
+    }
+
+    ap_run_generate_log_id(c, r, id);
+}
+
+AP_DECLARE(void) ap_register_log_hooks(apr_pool_t *p)
+{
+    ap_hook_generate_log_id(core_generate_log_id, NULL, NULL,
+                            APR_HOOK_REALLY_LAST);
+
+    ap_register_errorlog_handler(p, "a", log_remote_address, 0);
+    ap_register_errorlog_handler(p, "A", log_local_address, 0);
+    ap_register_errorlog_handler(p, "e", log_env_var, 0);
+    ap_register_errorlog_handler(p, "E", log_apr_status, 0);
+    ap_register_errorlog_handler(p, "F", log_file_line, 0);
+    ap_register_errorlog_handler(p, "i", log_header, 0);
+    ap_register_errorlog_handler(p, "k", log_keepalives, 0);
+    ap_register_errorlog_handler(p, "l", log_loglevel, 0);
+    ap_register_errorlog_handler(p, "L", log_log_id, 0);
+    ap_register_errorlog_handler(p, "m", log_module_name, 0);
+    ap_register_errorlog_handler(p, "n", log_note, 0);
+    ap_register_errorlog_handler(p, "P", log_pid, 0);
+    ap_register_errorlog_handler(p, "t", log_ctime, 0);
+    ap_register_errorlog_handler(p, "T", log_tid, 0);
+    ap_register_errorlog_handler(p, "v", log_virtual_host, 0);
+    ap_register_errorlog_handler(p, "V", log_server_name, 0);
+}
+
+/*
+ * This is used if no error log format is defined and during startup.
+ * It automatically omits the timestamp if logging to syslog.
+ */
+static int do_errorlog_default(const ap_errorlog_info *info, char *buf,
+                               int buflen, int *errstr_start, int *errstr_end,
+                               const char *errstr_fmt, va_list args)
+{
+    int len = 0;
+    int field_start = 0;
+    int item_len;
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+    char scratch[MAX_STRING_LEN];
+#endif
+
+    if (!info->using_syslog && !info->startup) {
+        buf[len++] = '[';
+        len += log_ctime(info, "u", buf + len, buflen - len);
+        buf[len++] = ']';
+        buf[len++] = ' ';
+    }
+
+    if (!info->startup) {
+        buf[len++] = '[';
+        len += log_module_name(info, NULL, buf + len, buflen - len);
+        buf[len++] = ':';
+        len += log_loglevel(info, NULL, buf + len, buflen - len);
+        len += cpystrn(buf + len, "] [pid ", buflen - len);
+
+        len += log_pid(info, NULL, buf + len, buflen - len);
+#if APR_HAS_THREADS
+        field_start = len;
+        len += cpystrn(buf + len, ":tid ", buflen - len);
+        item_len = log_tid(info, NULL, buf + len, buflen - len);
+        if (!item_len)
+            len = field_start;
+        else
+            len += item_len;
+#endif
+        buf[len++] = ']';
+        buf[len++] = ' ';
+    }
+
+    if (info->level >= APLOG_DEBUG) {
+        item_len = log_file_line(info, NULL, buf + len, buflen - len);
+        if (item_len) {
+            len += item_len;
+            len += cpystrn(buf + len, ": ", buflen - len);
+        }
+    }
+
+    if (info->status) {
+        item_len = log_apr_status(info, NULL, buf + len, buflen - len);
+        if (item_len) {
+            len += item_len;
+            len += cpystrn(buf + len, ": ", buflen - len);
+        }
+    }
+
+    /*
+     * useragent_ip/client_ip can be client or backend server. If we have
+     * a scoreboard handle, it is likely a client.
+     */
+    if (info->r) {
+        len += apr_snprintf(buf + len, buflen - len,
+                            info->r->connection->sbh ? "[client %s:%d] " : "[remote %s:%d] ",
+                            info->r->useragent_ip,
+                            info->r->useragent_addr ? info->r->useragent_addr->port : 0);
+    }
+    else if (info->c) {
+        len += apr_snprintf(buf + len, buflen - len,
+                            info->c->sbh ? "[client %s:%d] " : "[remote %s:%d] ",
+                            info->c->client_ip,
+                            info->c->client_addr ? info->c->client_addr->port : 0);
+    }
+
+    /* the actual error message */
+    *errstr_start = len;
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+    if (apr_vsnprintf(scratch, MAX_STRING_LEN, errstr_fmt, args)) {
+        len += ap_escape_errorlog_item(buf + len, scratch,
+                                       buflen - len);
+
+    }
+#else
+    len += apr_vsnprintf(buf + len, buflen - len, errstr_fmt, args);
+#endif
+    *errstr_end = len;
+
+    field_start = len;
+    len += cpystrn(buf + len, ", referer: ", buflen - len);
+    item_len = log_header(info, "Referer", buf + len, buflen - len);
+    if (item_len)
+        len += item_len;
+    else
+        len = field_start;
+
+    return len;
+}
+
+static int do_errorlog_format(apr_array_header_t *fmt, ap_errorlog_info *info,
+                              char *buf, int buflen, int *errstr_start,
+                              int *errstr_end, const char *err_fmt, va_list args)
+{
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+    char scratch[MAX_STRING_LEN];
+#endif
+    int i;
+    int len = 0;
+    int field_start = 0;
+    int skipping = 0;
+    ap_errorlog_format_item *items = (ap_errorlog_format_item *)fmt->elts;
+
+    AP_DEBUG_ASSERT(fmt->nelts > 0);
+    for (i = 0; i < fmt->nelts; ++i) {
+        ap_errorlog_format_item *item = &items[i];
+        if (item->flags & AP_ERRORLOG_FLAG_FIELD_SEP) {
+            if (skipping) {
+                skipping = 0;
+            }
+            else {
+                field_start = len;
+            }
+        }
+
+        if (item->flags & AP_ERRORLOG_FLAG_MESSAGE) {
+            /* the actual error message */
+            *errstr_start = len;
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+            if (apr_vsnprintf(scratch, MAX_STRING_LEN, err_fmt, args)) {
+                len += ap_escape_errorlog_item(buf + len, scratch,
+                                               buflen - len);
+
+            }
+#else
+            len += apr_vsnprintf(buf + len, buflen - len, err_fmt, args);
+#endif
+            *errstr_end = len;
+        }
+        else if (skipping) {
+            continue;
+        }
+        else if (info->level != -1 && (int)item->min_loglevel > info->level) {
+            len = field_start;
+            skipping = 1;
+        }
+        else {
+            int item_len = (*item->func)(info, item->arg, buf + len,
+                                         buflen - len);
+            if (!item_len) {
+                if (item->flags & AP_ERRORLOG_FLAG_REQUIRED) {
+                    /* required item is empty. skip whole line */
+                    buf[0] = '\0';
+                    return 0;
+                }
+                else if (item->flags & AP_ERRORLOG_FLAG_NULL_AS_HYPHEN) {
+                    buf[len++] = '-';
+                }
+                else {
+                    len = field_start;
+                    skipping = 1;
+                }
+            }
+            else {
+                len += item_len;
+            }
+        }
+    }
+    return len;
+}
+
+static void write_logline(char *errstr, apr_size_t len, apr_file_t *logf,
+                          int level)
+{
+    /* 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 < LOG_PRIMASK ? level : APLOG_DEBUG, "%.*s",
+               (int)len, errstr);
+    }
+#endif
+}
+
+static void log_error_core(const char *file, int line, int module_index,
+                           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];
+    apr_file_t *logf = NULL;
+    int level_and_mask = level & APLOG_LEVELMASK;
+    const request_rec *rmain = NULL;
+    core_server_config *sconf = NULL;
+    ap_errorlog_info info;
+
+    /* do we need to log once-per-req or once-per-conn info? */
+    int log_conn_info = 0, log_req_info = 0;
+    apr_array_header_t **lines = NULL;
+    int done = 0;
+    int line_number = 0;
+
+    if (r) {
+        AP_DEBUG_ASSERT(r->connection != NULL);
+        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;
+
+        /* Use the main ErrorLogFormat if any */
+        if (ap_server_conf) {
+            sconf = ap_get_core_module_config(ap_server_conf->module_config);
+        }
+    }
+    else {
+        int configured_level = r ? ap_get_request_module_loglevel(r, module_index)        :
+                               c ? ap_get_conn_server_module_loglevel(c, s, module_index) :
+                                   ap_get_server_module_loglevel(s, module_index);
+        if (s->error_log) {
+            /*
+             * If we are doing normal logging, don't log messages that are
+             * above the module's log level unless it is a startup/shutdown notice
+             */
+            if ((level_and_mask != APLOG_NOTICE)
+                && (level_and_mask > configured_level)) {
+                return;
+            }
+
+            logf = s->error_log;
+        }
+        else {
+            /*
+             * If we are doing syslog logging, don't log messages that are
+             * above the module's log level (including a startup/shutdown notice)
+             */
+            if (level_and_mask > configured_level) {
+                return;
+            }
+        }
+
+        /* the faked server_rec from mod_cgid does not have s->module_config */
+        if (s->module_config) {
+            sconf = ap_get_core_module_config(s->module_config);
+            if (c && !c->log_id) {
+                add_log_id(c, NULL);
+                if (sconf->error_log_conn && sconf->error_log_conn->nelts > 0)
+                    log_conn_info = 1;
+            }
+            if (r) {
+                if (r->main)
+                    rmain = r->main;
+                else
+                    rmain = r;
+
+                if (!rmain->log_id) {
+                    /* XXX: do we need separate log ids for subrequests? */
+                    if (sconf->error_log_req && sconf->error_log_req->nelts > 0)
+                        log_req_info = 1;
+                    /*
+                     * XXX: potential optimization: only create log id if %L is
+                     * XXX: actually used
+                     */
+                    add_log_id(c, rmain);
+                }
+            }
+        }
+        else if (ap_server_conf) {
+            /* Use the main ErrorLogFormat if any */
+            sconf = ap_get_core_module_config(ap_server_conf->module_config);
+        }
+    }
+
+    info.s             = s;
+    info.c             = c;
+    info.pool          = pool;
+    info.file          = NULL;
+    info.line          = 0;
+    info.status        = 0;
+    info.using_syslog  = (logf == NULL);
+    info.startup       = ((level & APLOG_STARTUP) == APLOG_STARTUP);
+    info.format        = fmt;
+
+    while (!done) {
+        apr_array_header_t *log_format;
+        int len = 0, errstr_start = 0, errstr_end = 0;
+        /* XXX: potential optimization: format common prefixes only once */
+        if (log_conn_info) {
+            /* once-per-connection info */
+            if (line_number == 0) {
+                lines = (apr_array_header_t **)sconf->error_log_conn->elts;
+                info.r = NULL;
+                info.rmain = NULL;
+                info.level = -1;
+                info.module_index = APLOG_NO_MODULE;
+            }
+
+            log_format = lines[line_number++];
+
+            if (line_number == sconf->error_log_conn->nelts) {
+                /* this is the last line of once-per-connection info */
+                line_number = 0;
+                log_conn_info = 0;
+            }
+        }
+        else if (log_req_info) {
+            /* once-per-request info */
+            if (line_number == 0) {
+                lines = (apr_array_header_t **)sconf->error_log_req->elts;
+                info.r = rmain;
+                info.rmain = rmain;
+                info.level = -1;
+                info.module_index = APLOG_NO_MODULE;
+            }
+
+            log_format = lines[line_number++];
+
+            if (line_number == sconf->error_log_req->nelts) {
+                /* this is the last line of once-per-request info */
+                line_number = 0;
+                log_req_info = 0;
+            }
+        }
+        else {
+            /* the actual error message */
+            info.r            = r;
+            info.rmain        = rmain;
+            info.level        = level_and_mask;
+            info.module_index = module_index;
+            info.file         = file;
+            info.line         = line;
+            info.status       = status;
+            log_format = sconf ? sconf->error_log_format : NULL;
+            done = 1;
+        }
+
+        /*
+         * prepare and log one line
+         */
+
+        if (log_format && !info.startup) {
+            len += do_errorlog_format(log_format, &info, errstr + len,
+                                      MAX_STRING_LEN - len,
+                                      &errstr_start, &errstr_end, fmt, args);
+        }
+        else {
+            len += do_errorlog_default(&info, errstr + len, MAX_STRING_LEN - len,
+                                       &errstr_start, &errstr_end, fmt, args);
+        }
+
+        if (!*errstr) {
+            /*
+             * Don't log empty lines. This can happen with once-per-conn/req
+             * info if an item with AP_ERRORLOG_FLAG_REQUIRED is NULL.
+             */
+            continue;
+        }
+        write_logline(errstr, len, logf, level_and_mask);
+
+        if (done) {
+            /*
+             * We don't call the error_log hook for per-request/per-conn
+             * lines, and we only pass the actual log message, not the
+             * prefix and suffix.
+             */
+            errstr[errstr_end] = '\0';
+            ap_run_error_log(&info, errstr + errstr_start);
+        }
+
+        *errstr = '\0';
+    }
+}
+
+/* For internal calls to log_error_core with self-composed arg lists */
+static void log_error_va_glue(const char *file, int line, int module_index,
+                              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;
+
+    va_start(args, fmt);
+    log_error_core(file, line, module_index, level, status, s, c, r, pool,
+                   fmt, args);
+    va_end(args);
+}
+
+AP_DECLARE(void) ap_log_error_(const char *file, int line, int module_index,
+                               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, module_index, level, status, s, NULL, NULL,
+                   NULL, fmt, args);
+    va_end(args);
+}
+
+AP_DECLARE(void) ap_log_perror_(const char *file, int line, int module_index,
+                                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, module_index, level, status, NULL, NULL, NULL,
+                   p, fmt, args);
+    va_end(args);
+}
+
+AP_DECLARE(void) ap_log_rerror_(const char *file, int line, int module_index,
+                                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, module_index, 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_cserror_(const char *file, int line, int module_index,
+                                 int level, apr_status_t status,
+                                 const conn_rec *c, const server_rec *s,
+                                 const char *fmt, ...)
+{
+    va_list args;
+
+    va_start(args, fmt);
+    log_error_core(file, line, module_index, level, status, s, c,
+                   NULL, NULL, fmt, args);
+    va_end(args);
+}
+
+AP_DECLARE(void) ap_log_cerror_(const char *file, int line, int module_index,
+                                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, module_index, level, status, c->base_server, c,
+                   NULL, NULL, fmt, args);
+    va_end(args);
+}
+
+#define BYTES_LOGGED_PER_LINE 16
+#define LOG_BYTES_BUFFER_SIZE (BYTES_LOGGED_PER_LINE * 3 + 2)
+
+static void fmt_data(unsigned char *buf, const void *vdata, apr_size_t len, apr_size_t *off)
+{
+    const unsigned char *data = (const unsigned char *)vdata;
+    unsigned char *chars;
+    unsigned char *hex;
+    apr_size_t this_time = 0;
+
+    memset(buf, ' ', LOG_BYTES_BUFFER_SIZE - 1);
+    buf[LOG_BYTES_BUFFER_SIZE - 1] = '\0';
+    
+    chars = buf; /* start character dump here */
+    hex   = buf + BYTES_LOGGED_PER_LINE + 1; /* start hex dump here */
+    while (*off < len && this_time < BYTES_LOGGED_PER_LINE) {
+        unsigned char c = data[*off];
+
+        if (apr_isprint(c)
+            && c != '\\') {  /* backslash will be escaped later, which throws
+                              * off the formatting
+                              */
+            *chars = c;
+        }
+        else {
+            *chars = '.';
+        }
+
+        if ((c >> 4) >= 10) {
+            *hex = 'a' + ((c >> 4) - 10);
+        }
+        else {
+            *hex = '0' + (c >> 4);
+        }
+
+        if ((c & 0x0F) >= 10) {
+            *(hex + 1) = 'a' + ((c & 0x0F) - 10);
+        }
+        else {
+            *(hex + 1) = '0' + (c & 0x0F);
+        }
+
+        chars += 1;
+        hex += 2;
+        *off += 1;
+        ++this_time;
+    }
+}
+
+static void log_data_core(const char *file, int line, int module_index,
+                          int level, const server_rec *s,
+                          const conn_rec *c, const request_rec *r,
+                          const char *label, const void *data, apr_size_t len,
+                          unsigned int flags)
+{
+    unsigned char buf[LOG_BYTES_BUFFER_SIZE];
+    apr_size_t off;
+    char prefix[20];
+
+    if (!(flags & AP_LOG_DATA_SHOW_OFFSET)) {
+        prefix[0] = '\0';
+    }
+
+    if (len > 0xffff) { /* bug in caller? */
+        len = 0xffff;
+    }
+
+    if (label) {
+        log_error_va_glue(file, line, module_index, level, APR_SUCCESS, s,
+                          c, r, NULL, "%s (%" APR_SIZE_T_FMT " bytes)",
+                          label, len);
+    }
+
+    off = 0;
+    while (off < len) {
+        if (flags & AP_LOG_DATA_SHOW_OFFSET) {
+            apr_snprintf(prefix, sizeof prefix, "%04x: ", (unsigned int)off);
+        }
+        fmt_data(buf, data, len, &off);
+        log_error_va_glue(file, line, module_index, level, APR_SUCCESS, s,
+                          c, r, NULL, "%s%s", prefix, buf);
+    }
+}
+
+AP_DECLARE(void) ap_log_data_(const char *file, int line, 
+                              int module_index, int level,
+                              const server_rec *s, const char *label,
+                              const void *data, apr_size_t len,
+                              unsigned int flags)
+{
+    log_data_core(file, line, module_index, level, s, NULL, NULL, label,
+                  data, len, flags);
+}
+
+AP_DECLARE(void) ap_log_rdata_(const char *file, int line,
+                               int module_index, int level,
+                               const request_rec *r, const char *label,
+                               const void *data, apr_size_t len,
+                               unsigned int flags)
+{
+    log_data_core(file, line, module_index, level, r->server, NULL, r, label,
+                  data, len, flags);
+}
+
+AP_DECLARE(void) ap_log_cdata_(const char *file, int line,
+                               int module_index, int level,
+                               const conn_rec *c, const char *label,
+                               const void *data, apr_size_t len,
+                               unsigned int flags)
+{
+    log_data_core(file, line, module_index, level, c->base_server, c, NULL,
+                  label, data, len, flags);
+}
+
+AP_DECLARE(void) ap_log_csdata_(const char *file, int line, int module_index,
+                                int level, const conn_rec *c, const server_rec *s,
+                                const char *label, const void *data,
+                                apr_size_t len, unsigned int flags)
+{
+    log_data_core(file, line, module_index, level, s, c, NULL, label, data,
+                  len, flags);
+}
+
+AP_DECLARE(void) ap_log_command_line(apr_pool_t *plog, server_rec *s)
+{
+    int i;
+    process_rec *process = s->process;
+    char *result;
+    int len_needed = 0;
+
+    /* Piece together the command line from the pieces
+     * in process->argv, with spaces in between.
+     */
+    for (i = 0; i < process->argc; i++) {
+        len_needed += strlen(process->argv[i]) + 1;
+    }
+
+    result = (char *) apr_palloc(plog, len_needed);
+    *result = '\0';
+
+    for (i = 0; i < process->argc; i++) {
+        strcat(result, process->argv[i]);
+        if ((i+1)< process->argc) {
+            strcat(result, " ");
+        }
+    }
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(00094)
+                 "Command line: '%s'", result);
+}
+
+/* grab bag function to log commonly logged and shared info */
+AP_DECLARE(void) ap_log_mpm_common(server_rec *s)
+{
+    ap_log_error(APLOG_MARK, APLOG_DEBUG , 0, s, APLOGNO(02639)
+                 "Using SO_REUSEPORT: %s (%d)",
+                 ap_have_so_reuseport ? "yes" : "no",
+                 ap_num_listen_buckets);
+}
+
+AP_DECLARE(void) ap_remove_pid(apr_pool_t *p, const char *rel_fname)
+{
+    apr_status_t rv;
+    const char *fname = ap_server_root_relative(p, rel_fname);
+
+    if (fname != NULL) {
+        rv = apr_file_remove(fname, p);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00095)
+                         "failed to remove PID file %s", fname);
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00096)
+                         "removed PID file %s (pid=%" APR_PID_T_FMT ")",
+                         fname, getpid());
+        }
+    }
+}
+
+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;
+    char *temp_fname;
+    apr_fileperms_t perms;
+    char pidstr[64];
+
+    if (!filename) {
+        return;
+    }
+
+    fname = ap_server_root_relative(p, filename);
+    if (!fname) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, APR_EBADPATH,
+                     ap_server_conf, APLOGNO(00097) "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, APLOGNO(00098)
+                      "pid file %s overwritten -- Unclean "
+                      "shutdown of previous Apache run?",
+                      fname);
+    }
+
+    temp_fname = apr_pstrcat(p, fname, ".XXXXXX", NULL);
+    rv = apr_file_mktemp(&pid_file, temp_fname,
+                         APR_FOPEN_WRITE | APR_FOPEN_CREATE | APR_FOPEN_TRUNCATE, p);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, APLOGNO(00099)
+                     "could not create %s", temp_fname);
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(00100)
+                     "%s: could not log pid to file %s",
+                     ap_server_argv0, fname);
+        exit(1);
+    }
+
+    apr_snprintf(pidstr, sizeof pidstr, "%" APR_PID_T_FMT APR_EOL_STR, mypid);
+
+    perms = APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD;
+    if (((rv = apr_file_perms_set(temp_fname, perms)) != APR_SUCCESS && rv != APR_ENOTIMPL)
+        || (rv = apr_file_write_full(pid_file, pidstr, strlen(pidstr), NULL)) != APR_SUCCESS
+        || (rv = apr_file_close(pid_file)) != APR_SUCCESS
+        || (rv = apr_file_rename(temp_fname, fname, p)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, APLOGNO(10231)
+                     "%s: Failed creating pid file %s",
+                     ap_server_argv0, temp_fname);
+        exit(1);
+    }
+
+    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,
+                     ap_server_conf, APLOGNO(00101) "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, APLOGNO(00102)
+                 "[%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_dir_set(procattr, ap_server_root))
+         != APR_SUCCESS) ||
+        ((status = apr_procattr_cmdtype_set(procattr, pl->cmdtype))
+         != APR_SUCCESS) ||
+        ((status = apr_procattr_child_in_set(procattr,
+                                             pl->read_fd,
+                                             pl->write_fd))
+         != APR_SUCCESS) ||
+        ((status = apr_procattr_child_errfn_set(procattr, log_child_errfn))
+         != APR_SUCCESS) ||
+        ((status = apr_procattr_error_check_set(procattr, 1)) != APR_SUCCESS)) {
+        /* Something bad happened, give up and go away. */
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, status, ap_server_conf, APLOGNO(00103)
+                     "piped_log_spawn: unable to setup child process '%s'",
+                     pl->program);
+    }
+    else {
+        char **args;
+
+        apr_tokenize_to_argv(pl->program, &args, pl->p);
+        procnew = apr_pcalloc(pl->p, sizeof(apr_proc_t));
+        status = apr_proc_create(procnew, args[0], (const char * const *) args,
+                                 NULL, procattr, pl->p);
+
+        if (status == APR_SUCCESS) {
+            pl->pid = procnew;
+            /* procnew->in was dup2'd from pl->write_fd;
+             * 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,
+                                          pl->write_fd, pl->p);
+            close_handle_in_child(pl->p, pl->read_fd);
+        }
+        else {
+            /* Something bad happened, give up and go away. */
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, status, ap_server_conf, APLOGNO(00104)
+                         "unable to start piped log program '%s'",
+                         pl->program);
+        }
+    }
+
+    return status;
+}
+
+
+static void piped_log_maintenance(int reason, void *data, apr_wait_t status)
+{
+    piped_log *pl = data;
+    apr_status_t rv;
+    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);
+        rv = ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00105)
+                         "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, APLOGNO(00106)
+                         "piped log program '%s' failed unexpectedly",
+                         pl->program);
+            if ((rv = piped_log_spawn(pl)) != APR_SUCCESS) {
+                /* what can we do?  This could be the error log we're having
+                 * problems opening up... */
+                ap_log_error(APLOG_MARK, APLOG_STARTUP, rv, NULL, APLOGNO(00107)
+                             "piped_log_maintenance: unable to respawn '%s'",
+                             pl->program);
+            }
+        }
+        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(pl->read_fd);
+    apr_file_close(pl->write_fd);
+    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_ex(apr_pool_t *p,
+                                             const char *program,
+                                             apr_cmdtype_e cmdtype)
+{
+    piped_log *pl;
+
+    pl = apr_palloc(p, sizeof (*pl));
+    pl->p = p;
+    pl->program = apr_pstrdup(p, program);
+    pl->pid = NULL;
+    pl->cmdtype = cmdtype;
+    if (apr_file_pipe_create_ex(&pl->read_fd,
+                                &pl->write_fd,
+                                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(pl->read_fd);
+        apr_file_close(pl->write_fd);
+        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(pl->write_fd);
+    return APR_SUCCESS;
+}
+
+AP_DECLARE(piped_log *) ap_open_piped_log_ex(apr_pool_t *p,
+                                             const char *program,
+                                             apr_cmdtype_e cmdtype)
+{
+    piped_log *pl;
+    apr_file_t *dummy = NULL;
+    int rc;
+
+    rc = log_child(p, program, &dummy, cmdtype, 0);
+    if (rc != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, ap_server_conf, APLOGNO(00108)
+                     "Couldn't start piped log process '%s'.",
+                     (program == NULL) ? "NULL" : program);
+        return NULL;
+    }
+
+    pl = apr_palloc(p, sizeof (*pl));
+    pl->p = p;
+    pl->read_fd = NULL;
+    pl->write_fd = dummy;
+    apr_pool_cleanup_register(p, pl, piped_log_cleanup, piped_log_cleanup);
+
+    return pl;
+}
+
+#endif
+
+AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p,
+                                          const char *program)
+{
+    apr_cmdtype_e cmdtype = APR_PROGRAM_ENV;
+
+    /* In 2.4 favor PROGRAM_ENV, accept "||prog" syntax for compatibility
+     * and "|$cmd" to override the default.
+     * Any 2.2 backport would continue to favor SHELLCMD_ENV so there
+     * accept "||prog" to override, and "|$cmd" to ease conversion.
+     */
+    if (*program == '|')
+        ++program;
+    if (*program == '$') {
+        cmdtype = APR_SHELLCMD_ENV;
+        ++program;
+    }
+
+    return ap_open_piped_log_ex(p, program, cmdtype);
+}
+
+AP_DECLARE(void) ap_close_piped_log(piped_log *pl)
+{
+    apr_pool_cleanup_run(pl->p, pl, piped_log_cleanup);
+}
+
+AP_DECLARE(const char *) ap_parse_log_level(const char *str, int *val)
+{
+    const char *err = "Log level keyword must be one of emerg/alert/crit/error/"
+                      "warn/notice/info/debug/trace1/.../trace8";
+    int i = 0;
+
+    if (str == NULL)
+        return err;
+
+    while (priorities[i].t_name != NULL) {
+        if (!strcasecmp(str, priorities[i].t_name)) {
+            *val = priorities[i].t_val;
+            return NULL;
+        }
+        i++;
+    }
+    return err;
+}
+
+AP_IMPLEMENT_HOOK_VOID(error_log,
+                       (const ap_errorlog_info *info, const char *errstr),
+                       (info, errstr))
+
+AP_IMPLEMENT_HOOK_RUN_FIRST(int, generate_log_id,
+                            (const conn_rec *c, const request_rec *r,
+                             const char **id),
+                            (c, r, id), DECLINED)