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apache2/apache2.4-mpm-itk-2.4.2-01.patch

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Accepting request 129508 from home:elvigia:branches:Apache - Upgrade to apache 2.4.2 ** ATTENTION, before installing this update YOU MUST READ http://httpd.apache.org/docs/2.4/upgrading.html CAREFULLY otherwise your server will most likely fail to start due to backward incompatible changes. * You can read the huge complete list of changes at http://httpd.apache.org/docs/2.4/new_features_2_4.html OBS-URL: https://build.opensuse.org/request/show/129508 OBS-URL: https://build.opensuse.org/package/show/Apache/apache2?expand=0&rev=370
2012-08-01 01:54:19 +00:00
Index: httpd-2.4.2/server/mpm/itk/Makefile.in
===================================================================
--- /dev/null
+++ httpd-2.4.2/server/mpm/itk/Makefile.in
@@ -0,0 +1 @@
+include $(top_srcdir)/build/special.mk
Index: httpd-2.4.2/server/mpm/itk/config.m4
===================================================================
--- /dev/null
+++ httpd-2.4.2/server/mpm/itk/config.m4
@@ -0,0 +1,7 @@
+AC_MSG_CHECKING(if itk MPM supports this platform)
+if test $forking_mpms_supported != yes; then
+ AC_MSG_RESULT(no - This is not a forking platform)
+else
+ AC_MSG_RESULT(yes)
+ APACHE_MPM_SUPPORTED(itk, yes, no)
+fi
Index: httpd-2.4.2/server/mpm/itk/config3.m4
===================================================================
--- /dev/null
+++ httpd-2.4.2/server/mpm/itk/config3.m4
@@ -0,0 +1 @@
+APACHE_MPM_MODULE(itk, $enable_mpm_itk)
Index: httpd-2.4.2/server/mpm/itk/itk.c
===================================================================
--- /dev/null
+++ httpd-2.4.2/server/mpm/itk/itk.c
@@ -0,0 +1,1917 @@
+/* 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.
+ *
+ * Portions copyright 2005-2012 Steinar H. Gunderson <sgunderson@bigfoot.com>.
+ * Licensed under the same terms as the rest of Apache.
+ *
+ * Portions copyright 2008 Knut Auvor Grythe <knut@auvor.no>.
+ * Licensed under the same terms as the rest of Apache.
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+
+# define _DBG(text,par...) \
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \
+ "(itkmpm: pid=%d uid=%d, gid=%d) %s(): " text, \
+ getpid(), getuid(), getgid(), __FUNCTION__, par)
+
+#define APR_WANT_STDIO
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#include <pwd.h>
+#include <grp.h>
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "mpm_default.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h"
+#include "http_core.h" /* for get_remote_host */
+#include "http_connection.h"
+#include "scoreboard.h"
+#include "ap_mpm.h"
+#include "util_mutex.h"
+#include "unixd.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "ap_mmn.h"
+#include "apr_poll.h"
+#include "ap_expr.h"
+
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h> /* for bindprocessor() */
+#endif
+
+#if HAVE_LIBCAP
+#include <sys/capability.h>
+#endif
+
+#include <signal.h>
+#include <sys/times.h>
+
+/* Import our private hook. */
+AP_DECLARE_HOOK(int,post_perdir_config,(request_rec *r))
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed. It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table. Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 256
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 200000
+#endif
+
+#ifndef HARD_THREAD_LIMIT
+#define HARD_THREAD_LIMIT 1
+#endif
+
+/* config globals */
+
+static apr_proc_mutex_t *accept_mutex;
+static int ap_daemons_to_start=0;
+static int ap_daemons_min_free=0;
+static int ap_daemons_max_free=0;
+static int ap_daemons_limit=0; /* MaxRequestWorkers */
+static int server_limit = 0;
+static int mpm_state = AP_MPMQ_STARTING;
+static ap_pod_t *pod;
+
+/* data retained by itk across load/unload of the module
+ * allocated on first call to pre-config hook; located on
+ * subsequent calls to pre-config hook
+ */
+typedef struct itk_retained_data {
+ int first_server_limit;
+ int module_loads;
+ ap_generation_t my_generation;
+ int volatile is_graceful; /* set from signal handler */
+ int maxclients_reported;
+ /*
+ * The max child slot ever assigned, preserved across restarts. Necessary
+ * to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts. We
+ * use this value to optimize routines that have to scan the entire scoreboard.
+ */
+ int max_daemons_limit;
+ /*
+ * idle_spawn_rate is the number of children that will be spawned on the
+ * next maintenance cycle if there aren't enough idle servers. It is
+ * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
+ * without the need to spawn.
+ */
+ int idle_spawn_rate;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE (32)
+#endif
+ int hold_off_on_exponential_spawning;
+} itk_retained_data;
+static itk_retained_data *retained;
+
+#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
+
+/* one_process --- debugging mode variable; can be set from the command line
+ * with the -X flag. If set, this gets you the child_main loop running
+ * in the process which originally started up (no detach, no make_child),
+ * which is a pretty nice debugging environment. (You'll get a SIGHUP
+ * early in standalone_main; just continue through. This is the server
+ * trying to kill off any child processes which it might have lying
+ * around --- Apache doesn't keep track of their pids, it just sends
+ * SIGHUP to the process group, ignoring it in the root process.
+ * Continue through and you'll be fine.).
+ */
+
+static int one_process = 0;
+
+static apr_pool_t *pconf; /* Pool for config stuff */
+static apr_pool_t *pchild; /* Pool for httpd child stuff */
+
+static pid_t ap_my_pid; /* it seems silly to call getpid all the time */
+static pid_t parent_pid;
+static int my_child_num;
+
+#define UNSET_NICE_VALUE 100
+
+typedef struct
+{
+ uid_t uid;
+ gid_t gid;
+ char *username;
+ int nice_value;
+ ap_expr_info_t *uid_expr;
+ ap_expr_info_t *gid_expr;
+} itk_per_dir_conf;
+
+typedef struct
+{
+ int max_clients_vhost;
+} itk_server_conf;
+
+module AP_MODULE_DECLARE_DATA mpm_itk_module;
+extern AP_DECLARE_DATA int ap_running_under_mpm_itk;
+
+#ifdef GPROF
+/*
+ * change directory for gprof to plop the gmon.out file
+ * configure in httpd.conf:
+ * GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out
+ * GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out
+ */
+static void chdir_for_gprof(void)
+{
+ core_server_config *sconf =
+ ap_get_core_module_config(ap_server_conf->module_config);
+ char *dir = sconf->gprof_dir;
+ const char *use_dir;
+
+ if(dir) {
+ apr_status_t res;
+ char *buf = NULL ;
+ int len = strlen(sconf->gprof_dir) - 1;
+ if(*(dir + len) == '%') {
+ dir[len] = '\0';
+ buf = ap_append_pid(pconf, dir, "gprof.");
+ }
+ use_dir = ap_server_root_relative(pconf, buf ? buf : dir);
+ res = apr_dir_make(use_dir,
+ APR_UREAD | APR_UWRITE | APR_UEXECUTE |
+ APR_GREAD | APR_GEXECUTE |
+ APR_WREAD | APR_WEXECUTE, pconf);
+ if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, res, ap_server_conf, APLOGNO(00142)
+ "gprof: error creating directory %s", dir);
+ }
+ }
+ else {
+ use_dir = ap_server_root_relative(pconf, DEFAULT_REL_RUNTIMEDIR);
+ }
+
+ chdir(use_dir);
+}
+#else
+#define chdir_for_gprof()
+#endif
+
+static void itk_note_child_killed(int childnum, pid_t pid,
+ ap_generation_t gen)
+{
+ AP_DEBUG_ASSERT(childnum != -1); /* no scoreboard squatting with this MPM */
+ ap_run_child_status(ap_server_conf,
+ ap_scoreboard_image->parent[childnum].pid,
+ ap_scoreboard_image->parent[childnum].generation,
+ childnum, MPM_CHILD_EXITED);
+ ap_scoreboard_image->parent[childnum].pid = 0;
+}
+
+static void itk_note_child_started(int slot, pid_t pid)
+{
+ ap_scoreboard_image->parent[slot].pid = pid;
+ ap_run_child_status(ap_server_conf,
+ ap_scoreboard_image->parent[slot].pid,
+ retained->my_generation, slot, MPM_CHILD_STARTED);
+}
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code) __attribute__ ((noreturn));
+static void clean_child_exit(int code)
+{
+ mpm_state = AP_MPMQ_STOPPING;
+
+ if (pchild) {
+ apr_pool_destroy(pchild);
+ }
+
+ if (one_process) {
+ itk_note_child_killed(/* slot */ 0, 0, 0);
+ }
+
+ ap_mpm_pod_close(pod);
+ chdir_for_gprof();
+ exit(code);
+}
+
+static void accept_mutex_on(void)
+{
+ apr_status_t rv = apr_proc_mutex_lock(accept_mutex);
+ if (rv != APR_SUCCESS) {
+ const char *msg = "couldn't grab the accept mutex";
+
+ if (retained->my_generation !=
+ ap_scoreboard_image->global->running_generation) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00143) "%s", msg);
+ clean_child_exit(0);
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00144) "%s", msg);
+ exit(APEXIT_CHILDFATAL);
+ }
+ }
+}
+
+static void accept_mutex_off(void)
+{
+ apr_status_t rv = apr_proc_mutex_unlock(accept_mutex);
+ if (rv != APR_SUCCESS) {
+ const char *msg = "couldn't release the accept mutex";
+
+ if (retained->my_generation !=
+ ap_scoreboard_image->global->running_generation) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00145) "%s", msg);
+ /* don't exit here... we have a connection to
+ * process, after which point we'll see that the
+ * generation changed and we'll exit cleanly
+ */
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00146) "%s", msg);
+ exit(APEXIT_CHILDFATAL);
+ }
+ }
+}
+
+/* On some architectures it's safe to do unserialized accept()s in the single
+ * Listen case. But it's never safe to do it in the case where there's
+ * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+ * when it's safe in the single Listen case.
+ */
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+#define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
+#else
+#define SAFE_ACCEPT(stmt) do {stmt;} while(0)
+#endif
+
+static int itk_query(int query_code, int *result, apr_status_t *rv)
+{
+ *rv = APR_SUCCESS;
+ switch(query_code){
+ case AP_MPMQ_MAX_DAEMON_USED:
+ *result = ap_daemons_limit;
+ break;
+ case AP_MPMQ_IS_THREADED:
+ *result = AP_MPMQ_NOT_SUPPORTED;
+ break;
+ case AP_MPMQ_IS_FORKED:
+ *result = AP_MPMQ_DYNAMIC;
+ break;
+ case AP_MPMQ_HARD_LIMIT_DAEMONS:
+ *result = server_limit;
+ break;
+ case AP_MPMQ_HARD_LIMIT_THREADS:
+ *result = HARD_THREAD_LIMIT;
+ break;
+ case AP_MPMQ_MAX_THREADS:
+ *result = 1;
+ break;
+ case AP_MPMQ_MIN_SPARE_DAEMONS:
+ *result = ap_daemons_min_free;
+ break;
+ case AP_MPMQ_MIN_SPARE_THREADS:
+ *result = 0;
+ break;
+ case AP_MPMQ_MAX_SPARE_DAEMONS:
+ *result = ap_daemons_max_free;
+ break;
+ case AP_MPMQ_MAX_SPARE_THREADS:
+ *result = 0;
+ break;
+ case AP_MPMQ_MAX_REQUESTS_DAEMON:
+ *result = ap_max_requests_per_child;
+ break;
+ case AP_MPMQ_MAX_DAEMONS:
+ *result = ap_daemons_limit;
+ break;
+ case AP_MPMQ_MPM_STATE:
+ *result = mpm_state;
+ break;
+ case AP_MPMQ_GENERATION:
+ *result = retained->my_generation;
+ break;
+ default:
+ *rv = APR_ENOTIMPL;
+ break;
+ }
+ return OK;
+}
+
+static const char *itk_get_name(void)
+{
+ return "itk";
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static void just_die(int sig)
+{
+ clean_child_exit(0);
+}
+
+/* volatile because they're updated from a signal handler */
+static int volatile shutdown_pending;
+static int volatile restart_pending;
+static int volatile die_now = 0;
+
+static void stop_listening(int sig)
+{
+ mpm_state = AP_MPMQ_STOPPING;
+ ap_close_listeners();
+
+ /* For a graceful stop, we want the child to exit when done */
+ die_now = 1;
+}
+
+static void sig_term(int sig)
+{
+ if (shutdown_pending == 1) {
+ /* Um, is this _probably_ not an error, if the user has
+ * tried to do a shutdown twice quickly, so we won't
+ * worry about reporting it.
+ */
+ return;
+ }
+ mpm_state = AP_MPMQ_STOPPING;
+ shutdown_pending = 1;
+ retained->is_graceful = (sig == AP_SIG_GRACEFUL_STOP);
+}
+
+/* restart() is the signal handler for SIGHUP and AP_SIG_GRACEFUL
+ * in the parent process, unless running in ONE_PROCESS mode
+ */
+static void restart(int sig)
+{
+ if (restart_pending == 1) {
+ /* Probably not an error - don't bother reporting it */
+ return;
+ }
+ mpm_state = AP_MPMQ_STOPPING;
+ restart_pending = 1;
+ retained->is_graceful = (sig == AP_SIG_GRACEFUL);
+}
+
+static void set_signals(void)
+{
+#ifndef NO_USE_SIGACTION
+ struct sigaction sa;
+#endif
+
+ if (!one_process) {
+ ap_fatal_signal_setup(ap_server_conf, pconf);
+ }
+
+#ifndef NO_USE_SIGACTION
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+
+ sa.sa_handler = sig_term;
+ if (sigaction(SIGTERM, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00147) "sigaction(SIGTERM)");
+#ifdef AP_SIG_GRACEFUL_STOP
+ if (sigaction(AP_SIG_GRACEFUL_STOP, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00148)
+ "sigaction(" AP_SIG_GRACEFUL_STOP_STRING ")");
+#endif
+#ifdef SIGINT
+ if (sigaction(SIGINT, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00149) "sigaction(SIGINT)");
+#endif
+#ifdef SIGXCPU
+ sa.sa_handler = SIG_DFL;
+ if (sigaction(SIGXCPU, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00150) "sigaction(SIGXCPU)");
+#endif
+#ifdef SIGXFSZ
+ /* For systems following the LFS standard, ignoring SIGXFSZ allows
+ * a write() beyond the 2GB limit to fail gracefully with E2BIG
+ * rather than terminate the process. */
+ sa.sa_handler = SIG_IGN;
+ if (sigaction(SIGXFSZ, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00151) "sigaction(SIGXFSZ)");
+#endif
+#ifdef SIGPIPE
+ sa.sa_handler = SIG_IGN;
+ if (sigaction(SIGPIPE, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00152) "sigaction(SIGPIPE)");
+#endif
+
+ /* we want to ignore HUPs and AP_SIG_GRACEFUL while we're busy
+ * processing one
+ */
+ sigaddset(&sa.sa_mask, SIGHUP);
+ sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
+ sa.sa_handler = restart;
+ if (sigaction(SIGHUP, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00153) "sigaction(SIGHUP)");
+ if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00154) "sigaction(" AP_SIG_GRACEFUL_STRING ")");
+#else
+ if (!one_process) {
+#ifdef SIGXCPU
+ apr_signal(SIGXCPU, SIG_DFL);
+#endif /* SIGXCPU */
+#ifdef SIGXFSZ
+ apr_signal(SIGXFSZ, SIG_IGN);
+#endif /* SIGXFSZ */
+ }
+
+ apr_signal(SIGTERM, sig_term);
+#ifdef SIGHUP
+ apr_signal(SIGHUP, restart);
+#endif /* SIGHUP */
+#ifdef AP_SIG_GRACEFUL
+ apr_signal(AP_SIG_GRACEFUL, restart);
+#endif /* AP_SIG_GRACEFUL */
+#ifdef AP_SIG_GRACEFUL_STOP
+ apr_signal(AP_SIG_GRACEFUL_STOP, sig_term);
+#endif /* AP_SIG_GRACEFUL */
+#ifdef SIGPIPE
+ apr_signal(SIGPIPE, SIG_IGN);
+#endif /* SIGPIPE */
+
+#endif
+}
+
+/*****************************************************************
+ * Child process main loop.
+ * The following vars are static to avoid getting clobbered by longjmp();
+ * they are really private to child_main.
+ */
+
+static int requests_this_child;
+static int num_listensocks = 0;
+
+static void child_main(int child_num_arg)
+{
+#if APR_HAS_THREADS
+ apr_thread_t *thd = NULL;
+ apr_os_thread_t osthd;
+#endif
+ apr_pool_t *ptrans;
+ apr_allocator_t *allocator;
+ apr_status_t status;
+ int i;
+ ap_listen_rec *lr;
+ apr_pollset_t *pollset;
+ ap_sb_handle_t *sbh;
+ apr_bucket_alloc_t *bucket_alloc;
+ int last_poll_idx = 0;
+ const char *lockfile;
+
+#if HAVE_LIBCAP
+ cap_t caps;
+ cap_value_t suidcaps[] = {
+ CAP_SETUID,
+ CAP_SETGID,
+ CAP_DAC_READ_SEARCH,
+ CAP_SYS_NICE,
+ };
+#endif
+
+ mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
+ * child initializes
+ */
+
+ ap_running_under_mpm_itk = 1;
+ my_child_num = child_num_arg;
+ ap_my_pid = getpid();
+ requests_this_child = 0;
+
+ ap_fatal_signal_child_setup(ap_server_conf);
+
+ /* Get a sub context for global allocations in this child, so that
+ * we can have cleanups occur when the child exits.
+ */
+ apr_allocator_create(&allocator);
+ apr_allocator_max_free_set(allocator, ap_max_mem_free);
+ apr_pool_create_ex(&pchild, pconf, NULL, allocator);
+ apr_allocator_owner_set(allocator, pchild);
+ apr_pool_tag(pchild, "pchild");
+
+#if APR_HAS_THREADS
+ osthd = apr_os_thread_current();
+ apr_os_thread_put(&thd, &osthd, pchild);
+#endif
+
+ apr_pool_create(&ptrans, pchild);
+ apr_pool_tag(ptrans, "transaction");
+
+ /* needs to be done before we switch UIDs so we have permissions */
+ ap_reopen_scoreboard(pchild, NULL, 0);
+ lockfile = apr_proc_mutex_lockfile(accept_mutex);
+ status = apr_proc_mutex_child_init(&accept_mutex,
+ lockfile,
+ pchild);
+ if (status != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00155)
+ "Couldn't initialize cross-process lock in child "
+ "(%s) (%s)",
+ lockfile ? lockfile : "none",
+ apr_proc_mutex_name(accept_mutex));
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ ap_run_child_init(pchild, ap_server_conf);
+
+ ap_create_sb_handle(&sbh, pchild, my_child_num, 0);
+
+ (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
+
+ /* Set up the pollfd array */
+ status = apr_pollset_create(&pollset, num_listensocks, pchild, 0);
+ if (status != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00156)
+ "Couldn't create pollset in child; check system or user limits");
+ clean_child_exit(APEXIT_CHILDSICK); /* assume temporary resource issue */
+ }
+
+ for (lr = ap_listeners, i = num_listensocks; i--; lr = lr->next) {
+ apr_pollfd_t pfd = { 0 };
+
+ pfd.desc_type = APR_POLL_SOCKET;
+ pfd.desc.s = lr->sd;
+ pfd.reqevents = APR_POLLIN;
+ pfd.client_data = lr;
+
+ status = apr_pollset_add(pollset, &pfd);
+ if (status != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00157)
+ "Couldn't add listener to pollset; check system or user limits");
+ clean_child_exit(APEXIT_CHILDSICK);
+ }
+
+ lr->accept_func = ap_unixd_accept;
+ }
+
+#if HAVE_LIBCAP
+ /* Drop as many privileges as we can. We'll still
+ * access files with uid=0, and we can setuid() to anything, but
+ * at least there's tons of other evilness (like loading kernel
+ * modules) we can't do directly. (The setuid() capability will
+ * go away automatically when we setuid() or exec() -- the former
+ * is likely to come first.)
+ */
+ caps = cap_init();
+ cap_clear(caps);
+ cap_set_flag(caps, CAP_PERMITTED, sizeof(suidcaps)/sizeof(cap_value_t), suidcaps, CAP_SET);
+ cap_set_flag(caps, CAP_EFFECTIVE, sizeof(suidcaps)/sizeof(cap_value_t), suidcaps, CAP_SET);
+ cap_set_proc(caps);
+ cap_free(caps);
+#endif
+
+ mpm_state = AP_MPMQ_RUNNING;
+
+ bucket_alloc = apr_bucket_alloc_create(pchild);
+
+ /* die_now is set when AP_SIG_GRACEFUL is received in the child;
+ * shutdown_pending is set when SIGTERM is received when running
+ * in single process mode. */
+ while (!die_now && !shutdown_pending) {
+ conn_rec *current_conn;
+ void *csd;
+
+ /*
+ * (Re)initialize this child to a pre-connection state.
+ */
+
+ apr_pool_clear(ptrans);
+
+ if ((ap_max_requests_per_child > 0
+ && requests_this_child++ >= ap_max_requests_per_child)) {
+ clean_child_exit(0);
+ }
+
+ (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
+
+ /*
+ * Wait for an acceptable connection to arrive.
+ */
+
+ /* Lock around "accept", if necessary */
+ SAFE_ACCEPT(accept_mutex_on());
+
+ if (num_listensocks == 1) {
+ /* There is only one listener record, so refer to that one. */
+ lr = ap_listeners;
+ }
+ else {
+ /* multiple listening sockets - need to poll */
+ for (;;) {
+ apr_int32_t numdesc;
+ const apr_pollfd_t *pdesc;
+
+ /* check for termination first so we don't sleep for a while in
+ * poll if already signalled
+ */
+ if (die_now /* in graceful stop/restart */
+ || (one_process && shutdown_pending)) {
+ SAFE_ACCEPT(accept_mutex_off());
+ clean_child_exit(0);
+ }
+
+ /* timeout == 10 seconds to avoid a hang at graceful restart/stop
+ * caused by the closing of sockets by the signal handler
+ */
+ status = apr_pollset_poll(pollset, apr_time_from_sec(10),
+ &numdesc, &pdesc);
+ if (status != APR_SUCCESS) {
+ if (APR_STATUS_IS_TIMEUP(status) ||
+ APR_STATUS_IS_EINTR(status)) {
+ continue;
+ }
+ /* Single Unix documents select as returning errnos
+ * EBADF, EINTR, and EINVAL... and in none of those
+ * cases does it make sense to continue. In fact
+ * on Linux 2.0.x we seem to end up with EFAULT
+ * occasionally, and we'd loop forever due to it.
+ */
+ ap_log_error(APLOG_MARK, APLOG_ERR, status,
+ ap_server_conf, APLOGNO(00158) "apr_pollset_poll: (listen)");
+ SAFE_ACCEPT(accept_mutex_off());
+ clean_child_exit(1);
+ }
+
+ /* We can always use pdesc[0], but sockets at position N
+ * could end up completely starved of attention in a very
+ * busy server. Therefore, we round-robin across the
+ * returned set of descriptors. While it is possible that
+ * the returned set of descriptors might flip around and
+ * continue to starve some sockets, we happen to know the
+ * internal pollset implementation retains ordering
+ * stability of the sockets. Thus, the round-robin should
+ * ensure that a socket will eventually be serviced.
+ */
+ if (last_poll_idx >= numdesc)
+ last_poll_idx = 0;
+
+ /* Grab a listener record from the client_data of the poll
+ * descriptor, and advance our saved index to round-robin
+ * the next fetch.
+ *
+ * ### hmm... this descriptor might have POLLERR rather
+ * ### than POLLIN
+ */
+ lr = pdesc[last_poll_idx++].client_data;
+ goto got_fd;
+ }
+ }
+ got_fd:
+ /* if we accept() something we don't want to die, so we have to
+ * defer the exit
+ */
+ status = lr->accept_func(&csd, lr, ptrans);
+
+ SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
+
+ if (status == APR_EGENERAL) {
+ /* resource shortage or should-not-occur occured */
+ clean_child_exit(1);
+ }
+ else if (status != APR_SUCCESS) {
+ continue;
+ }
+
+ /*
+ * We now have a connection, so set it up with the appropriate
+ * socket options, file descriptors, and read/write buffers.
+ */
+
+ {
+ pid_t pid = fork(), child_pid;
+ int status;
+ switch (pid) {
+ case -1:
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL, "fork: Unable to fork new process");
+ break;
+ case 0: /* child */
+ current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, my_child_num, sbh, bucket_alloc);
+ if (current_conn) {
+#if APR_HAS_THREADS
+ current_conn->current_thread = thd;
+#endif
+ ap_process_connection(current_conn, csd);
+ ap_lingering_close(current_conn);
+ }
+ clean_child_exit(0);
+ default: /* parent; just wait for child to be done */
+ do {
+ child_pid = waitpid(pid, &status, 0);
+ } while (child_pid == -1 && errno == EINTR);
+
+ if (child_pid != pid || !WIFEXITED(status)) {
+ if (WIFSIGNALED(status)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "child died with signal %u", WTERMSIG(status));
+ } else if (WEXITSTATUS(status) != 0) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "child exited with non-zero exit status %u", WEXITSTATUS(status));
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL, "waitpid() failed");
+ }
+ clean_child_exit(1);
+ }
+ break;
+ }
+ }
+
+ /* Check the pod and the generation number after processing a
+ * connection so that we'll go away if a graceful restart occurred
+ * while we were processing the connection or we are the lucky
+ * idle server process that gets to die.
+ */
+ if (ap_mpm_pod_check(pod) == APR_SUCCESS) { /* selected as idle? */
+ die_now = 1;
+ }
+ else if (retained->my_generation !=
+ ap_scoreboard_image->global->running_generation) { /* restart? */
+ /* yeah, this could be non-graceful restart, in which case the
+ * parent will kill us soon enough, but why bother checking?
+ */
+ die_now = 1;
+ }
+
+ /* if we have already setuid(), die (we can't be used anyhow) */
+ if (getuid())
+ die_now = 1;
+ }
+ apr_pool_clear(ptrans); /* kludge to avoid crash in APR reslist cleanup code */
+ clean_child_exit(0);
+}
+
+
+static int make_child(server_rec *s, int slot)
+{
+ int pid;
+
+ if (slot + 1 > retained->max_daemons_limit) {
+ retained->max_daemons_limit = slot + 1;
+ }
+
+ if (one_process) {
+ apr_signal(SIGHUP, sig_term);
+ /* Don't catch AP_SIG_GRACEFUL in ONE_PROCESS mode :) */
+ apr_signal(SIGINT, sig_term);
+#ifdef SIGQUIT
+ apr_signal(SIGQUIT, SIG_DFL);
+#endif
+ apr_signal(SIGTERM, sig_term);
+ itk_note_child_started(slot, getpid());
+ child_main(slot);
+ /* NOTREACHED */
+ }
+
+ (void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING,
+ (request_rec *) NULL);
+
+
+#ifdef _OSD_POSIX
+ /* BS2000 requires a "special" version of fork() before a setuid() call */
+ if ((pid = os_fork(ap_unixd_config.user_name)) == -1) {
+#else
+ if ((pid = fork()) == -1) {
+#endif
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00159) "fork: Unable to fork new process");
+
+ /* fork didn't succeed. Fix the scoreboard or else
+ * it will say SERVER_STARTING forever and ever
+ */
+ (void) ap_update_child_status_from_indexes(slot, 0, SERVER_DEAD,
+ (request_rec *) NULL);
+
+ /* In case system resources are maxxed out, we don't want
+ * Apache running away with the CPU trying to fork over and
+ * over and over again.
+ */
+ sleep(10);
+
+ return -1;
+ }
+
+ if (!pid) {
+#ifdef HAVE_BINDPROCESSOR
+ /* by default AIX binds to a single processor
+ * this bit unbinds children which will then bind to another cpu
+ */
+ int status = bindprocessor(BINDPROCESS, (int)getpid(),
+ PROCESSOR_CLASS_ANY);
+ if (status != OK) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
+ ap_server_conf, APLOGNO(00160) "processor unbind failed");
+ }
+#endif
+ RAISE_SIGSTOP(MAKE_CHILD);
+ AP_MONCONTROL(1);
+ /* Disable the parent's signal handlers and set up proper handling in
+ * the child.
+ */
+ apr_signal(SIGHUP, just_die);
+ apr_signal(SIGTERM, just_die);
+ /* The child process just closes listeners on AP_SIG_GRACEFUL.
+ * The pod is used for signalling the graceful restart.
+ */
+ apr_signal(AP_SIG_GRACEFUL, stop_listening);
+ child_main(slot);
+ }
+
+ itk_note_child_started(slot, pid);
+
+ return 0;
+}
+
+
+/* start up a bunch of children */
+static void startup_children(int number_to_start)
+{
+ int i;
+
+ for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
+ if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) {
+ continue;
+ }
+ if (make_child(ap_server_conf, i) < 0) {
+ break;
+ }
+ --number_to_start;
+ }
+}
+
+static void perform_idle_server_maintenance(apr_pool_t *p)
+{
+ int i;
+ int idle_count;
+ worker_score *ws;
+ int free_length;
+ int free_slots[MAX_SPAWN_RATE];
+ int last_non_dead;
+ int total_non_dead;
+
+ /* initialize the free_list */
+ free_length = 0;
+
+ idle_count = 0;
+ last_non_dead = -1;
+ total_non_dead = 0;
+
+ for (i = 0; i < ap_daemons_limit; ++i) {
+ int status;
+
+ if (i >= retained->max_daemons_limit && free_length == retained->idle_spawn_rate)
+ break;
+ ws = &ap_scoreboard_image->servers[i][0];
+ status = ws->status;
+ if (status == SERVER_DEAD) {
+ /* try to keep children numbers as low as possible */
+ if (free_length < retained->idle_spawn_rate) {
+ free_slots[free_length] = i;
+ ++free_length;
+ }
+ }
+ else {
+ /* We consider a starting server as idle because we started it
+ * at least a cycle ago, and if it still hasn't finished starting
+ * then we're just going to swamp things worse by forking more.
+ * So we hopefully won't need to fork more if we count it.
+ * This depends on the ordering of SERVER_READY and SERVER_STARTING.
+ */
+ if (status <= SERVER_READY) {
+ ++ idle_count;
+ }
+
+ ++total_non_dead;
+ last_non_dead = i;
+ }
+ }
+ retained->max_daemons_limit = last_non_dead + 1;
+ if (idle_count > ap_daemons_max_free) {
+ /* kill off one child... we use the pod because that'll cause it to
+ * shut down gracefully, in case it happened to pick up a request
+ * while we were counting
+ */
+ ap_mpm_pod_signal(pod);
+ retained->idle_spawn_rate = 1;
+ }
+ else if (idle_count < ap_daemons_min_free) {
+ /* terminate the free list */
+ if (free_length == 0) {
+ /* only report this condition once */
+ if (!retained->maxclients_reported) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00161)
+ "server reached MaxRequestWorkers setting, consider"
+ " raising the MaxRequestWorkers setting");
+ retained->maxclients_reported = 1;
+ }
+ retained->idle_spawn_rate = 1;
+ }
+ else {
+ if (retained->idle_spawn_rate >= 8) {
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00162)
+ "server seems busy, (you may need "
+ "to increase StartServers, or Min/MaxSpareServers), "
+ "spawning %d children, there are %d idle, and "
+ "%d total children", retained->idle_spawn_rate,
+ idle_count, total_non_dead);
+ }
+ for (i = 0; i < free_length; ++i) {
+ make_child(ap_server_conf, free_slots[i]);
+ }
+ /* the next time around we want to spawn twice as many if this
+ * wasn't good enough, but not if we've just done a graceful
+ */
+ if (retained->hold_off_on_exponential_spawning) {
+ --retained->hold_off_on_exponential_spawning;
+ }
+ else if (retained->idle_spawn_rate < MAX_SPAWN_RATE) {
+ retained->idle_spawn_rate *= 2;
+ }
+ }
+ }
+ else {
+ retained->idle_spawn_rate = 1;
+ }
+}
+
+/*****************************************************************
+ * Executive routines.
+ */
+
+static int itk_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
+{
+ int index;
+ int remaining_children_to_start;
+ apr_status_t rv;
+
+ ap_log_pid(pconf, ap_pid_fname);
+
+ /* Initialize cross-process accept lock */
+ rv = ap_proc_mutex_create(&accept_mutex, NULL, AP_ACCEPT_MUTEX_TYPE, NULL,
+ s, _pconf, 0);
+ if (rv != APR_SUCCESS) {
+ mpm_state = AP_MPMQ_STOPPING;
+ return DONE;
+ }
+
+ if (!retained->is_graceful) {
+ if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+ mpm_state = AP_MPMQ_STOPPING;
+ return DONE;
+ }
+ /* fix the generation number in the global score; we just got a new,
+ * cleared scoreboard
+ */
+ ap_scoreboard_image->global->running_generation = retained->my_generation;
+ }
+
+ restart_pending = shutdown_pending = 0;
+ set_signals();
+
+ if (one_process) {
+ AP_MONCONTROL(1);
+ make_child(ap_server_conf, 0);
+ /* NOTREACHED */
+ }
+ else {
+ if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
+ ap_daemons_max_free = ap_daemons_min_free + 1;
+
+ /* If we're doing a graceful_restart then we're going to see a lot
+ * of children exiting immediately when we get into the main loop
+ * below (because we just sent them AP_SIG_GRACEFUL). This happens pretty
+ * rapidly... and for each one that exits we'll start a new one until
+ * we reach at least daemons_min_free. But we may be permitted to
+ * start more than that, so we'll just keep track of how many we're
+ * supposed to start up without the 1 second penalty between each fork.
+ */
+ remaining_children_to_start = ap_daemons_to_start;
+ if (remaining_children_to_start > ap_daemons_limit) {
+ remaining_children_to_start = ap_daemons_limit;
+ }
+ if (!retained->is_graceful) {
+ startup_children(remaining_children_to_start);
+ remaining_children_to_start = 0;
+ }
+ else {
+ /* give the system some time to recover before kicking into
+ * exponential mode
+ */
+ retained->hold_off_on_exponential_spawning = 10;
+ }
+
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00163)
+ "%s configured -- resuming normal operations",
+ ap_get_server_description());
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00164)
+ "Server built: %s", ap_get_server_built());
+ ap_log_command_line(plog, s);
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00165)
+ "Accept mutex: %s (default: %s)",
+ apr_proc_mutex_name(accept_mutex),
+ apr_proc_mutex_defname());
+
+ mpm_state = AP_MPMQ_RUNNING;
+
+ while (!restart_pending && !shutdown_pending) {
+ int child_slot;
+ apr_exit_why_e exitwhy;
+ int status, processed_status;
+ /* this is a memory leak, but I'll fix it later. */
+ apr_proc_t pid;
+
+ ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
+
+ /* XXX: if it takes longer than 1 second for all our children
+ * to start up and get into IDLE state then we may spawn an
+ * extra child
+ */
+ if (pid.pid != -1) {
+ processed_status = ap_process_child_status(&pid, exitwhy, status);
+ child_slot = ap_find_child_by_pid(&pid);
+ if (processed_status == APEXIT_CHILDFATAL) {
+ /* fix race condition found in PR 39311
+ * A child created at the same time as a graceful happens
+ * can find the lock missing and create a fatal error.
+ * It is not fatal for the last generation to be in this state.
+ */
+ if (child_slot < 0
+ || ap_get_scoreboard_process(child_slot)->generation
+ == retained->my_generation) {
+ mpm_state = AP_MPMQ_STOPPING;
+ return DONE;
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00166)
+ "Ignoring fatal error in child of previous "
+ "generation (pid %ld).",
+ (long)pid.pid);
+ }
+ }
+
+ /* non-fatal death... note that it's gone in the scoreboard. */
+ if (child_slot >= 0) {
+ (void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
+ (request_rec *) NULL);
+ itk_note_child_killed(child_slot, 0, 0);
+ if (processed_status == APEXIT_CHILDSICK) {
+ /* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
+ * cut the fork rate to the minimum
+ */
+ retained->idle_spawn_rate = 1;
+ }
+ else if (remaining_children_to_start
+ && child_slot < ap_daemons_limit) {
+ /* we're still doing a 1-for-1 replacement of dead
+ * children with new children
+ */
+ make_child(ap_server_conf, child_slot);
+ --remaining_children_to_start;
+ }
+#if APR_HAS_OTHER_CHILD
+ }
+ else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH, status) == APR_SUCCESS) {
+ /* handled */
+#endif
+ }
+ else if (retained->is_graceful) {
+ /* Great, we've probably just lost a slot in the
+ * scoreboard. Somehow we don't know about this
+ * child.
+ */
+ ap_log_error(APLOG_MARK, APLOG_WARNING,
+ 0, ap_server_conf, APLOGNO(00167)
+ "long lost child came home! (pid %ld)", (long)pid.pid);
+ }
+ /* Don't perform idle maintenance when a child dies,
+ * only do it when there's a timeout. Remember only a
+ * finite number of children can die, and it's pretty
+ * pathological for a lot to die suddenly.
+ */
+ continue;
+ }
+ else if (remaining_children_to_start) {
+ /* we hit a 1 second timeout in which none of the previous
+ * generation of children needed to be reaped... so assume
+ * they're all done, and pick up the slack if any is left.
+ */
+ startup_children(remaining_children_to_start);
+ remaining_children_to_start = 0;
+ /* In any event we really shouldn't do the code below because
+ * few of the servers we just started are in the IDLE state
+ * yet, so we'd mistakenly create an extra server.
+ */
+ continue;
+ }
+
+ perform_idle_server_maintenance(pconf);
+ }
+ } /* one_process */
+
+ mpm_state = AP_MPMQ_STOPPING;
+
+ if (shutdown_pending && !retained->is_graceful) {
+ /* Time to shut down:
+ * Kill child processes, tell them to call child_exit, etc...
+ */
+ if (ap_unixd_killpg(getpgrp(), SIGTERM) < 0) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00168) "killpg SIGTERM");
+ }
+ ap_reclaim_child_processes(1, /* Start with SIGTERM */
+ itk_note_child_killed);
+
+ /* cleanup pid file on normal shutdown */
+ ap_remove_pid(pconf, ap_pid_fname);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00169)
+ "caught SIGTERM, shutting down");
+
+ return DONE;
+ } else if (shutdown_pending) {
+ /* Time to perform a graceful shut down:
+ * Reap the inactive children, and ask the active ones
+ * to close their listeners, then wait until they are
+ * all done to exit.
+ */
+ int active_children;
+ apr_time_t cutoff = 0;
+
+ /* Stop listening */
+ ap_close_listeners();
+
+ /* kill off the idle ones */
+ ap_mpm_pod_killpg(pod, retained->max_daemons_limit);
+
+ /* Send SIGUSR1 to the active children */
+ active_children = 0;
+ for (index = 0; index < ap_daemons_limit; ++index) {
+ if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
+ /* Ask each child to close its listeners. */
+ ap_mpm_safe_kill(MPM_CHILD_PID(index), AP_SIG_GRACEFUL);
+ active_children++;
+ }
+ }
+
+ /* Allow each child which actually finished to exit */
+ ap_relieve_child_processes(itk_note_child_killed);
+
+ /* cleanup pid file */
+ ap_remove_pid(pconf, ap_pid_fname);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00170)
+ "caught " AP_SIG_GRACEFUL_STOP_STRING ", shutting down gracefully");
+
+ if (ap_graceful_shutdown_timeout) {
+ cutoff = apr_time_now() +
+ apr_time_from_sec(ap_graceful_shutdown_timeout);
+ }
+
+ /* Don't really exit until each child has finished */
+ shutdown_pending = 0;
+ do {
+ /* Pause for a second */
+ sleep(1);
+
+ /* Relieve any children which have now exited */
+ ap_relieve_child_processes(itk_note_child_killed);
+
+ active_children = 0;
+ for (index = 0; index < ap_daemons_limit; ++index) {
+ if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
+ active_children = 1;
+ /* Having just one child is enough to stay around */
+ break;
+ }
+ }
+ } while (!shutdown_pending && active_children &&
+ (!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
+
+ /* We might be here because we received SIGTERM, either
+ * way, try and make sure that all of our processes are
+ * really dead.
+ */
+ ap_unixd_killpg(getpgrp(), SIGTERM);
+
+ return DONE;
+ }
+
+ /* we've been told to restart */
+ apr_signal(SIGHUP, SIG_IGN);
+ apr_signal(AP_SIG_GRACEFUL, SIG_IGN);
+ if (one_process) {
+ /* not worth thinking about */
+ return DONE;
+ }
+
+ /* advance to the next generation */
+ /* XXX: we really need to make sure this new generation number isn't in
+ * use by any of the children.
+ */
+ ++retained->my_generation;
+ ap_scoreboard_image->global->running_generation = retained->my_generation;
+
+ if (retained->is_graceful) {
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00171)
+ "Graceful restart requested, doing restart");
+
+ /* kill off the idle ones */
+ ap_mpm_pod_killpg(pod, retained->max_daemons_limit);
+
+ /* This is mostly for debugging... so that we know what is still
+ * gracefully dealing with existing request. This will break
+ * in a very nasty way if we ever have the scoreboard totally
+ * file-based (no shared memory)
+ */
+ for (index = 0; index < ap_daemons_limit; ++index) {
+ if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
+ ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL;
+ /* Ask each child to close its listeners.
+ *
+ * NOTE: we use the scoreboard, because if we send SIGUSR1
+ * to every process in the group, this may include CGI's,
+ * piped loggers, etc. They almost certainly won't handle
+ * it gracefully.
+ */
+ ap_mpm_safe_kill(ap_scoreboard_image->parent[index].pid, AP_SIG_GRACEFUL);
+ }
+ }
+ }
+ else {
+ /* Kill 'em off */
+ if (ap_unixd_killpg(getpgrp(), SIGHUP) < 0) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00172) "killpg SIGHUP");
+ }
+ ap_reclaim_child_processes(0, /* Not when just starting up */
+ itk_note_child_killed);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00173)
+ "SIGHUP received. Attempting to restart");
+ }
+
+ return OK;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int itk_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+ int startup = 0;
+ int level_flags = 0;
+ apr_status_t rv;
+
+ pconf = p;
+
+ /* the reverse of pre_config, we want this only the first time around */
+ if (retained->module_loads == 1) {
+ startup = 1;
+ level_flags |= APLOG_STARTUP;
+ }
+
+ if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
+ (startup ? NULL : s),
+ "no listening sockets available, shutting down");
+ return DONE;
+ }
+
+ if ((rv = ap_mpm_pod_open(pconf, &pod))) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+ (startup ? NULL : s),
+ "could not open pipe-of-death");
+ return DONE;
+ }
+ return OK;
+}
+
+static int itk_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+ int no_detach, debug, foreground;
+ apr_status_t rv;
+ const char *userdata_key = "mpm_itk_module";
+
+ mpm_state = AP_MPMQ_STARTING;
+
+ debug = ap_exists_config_define("DEBUG");
+
+ if (debug) {
+ foreground = one_process = 1;
+ no_detach = 0;
+ }
+ else
+ {
+ no_detach = ap_exists_config_define("NO_DETACH");
+ one_process = ap_exists_config_define("ONE_PROCESS");
+ foreground = ap_exists_config_define("FOREGROUND");
+ }
+
+ ap_mutex_register(p, AP_ACCEPT_MUTEX_TYPE, NULL, APR_LOCK_DEFAULT, 0);
+
+ /* sigh, want this only the second time around */
+ retained = ap_retained_data_get(userdata_key);
+ if (!retained) {
+ retained = ap_retained_data_create(userdata_key, sizeof(*retained));
+ retained->max_daemons_limit = -1;
+ retained->idle_spawn_rate = 1;
+ }
+ ++retained->module_loads;
+ if (retained->module_loads == 2) {
+ if (!one_process && !foreground) {
+ /* before we detach, setup crash handlers to log to errorlog */
+ ap_fatal_signal_setup(ap_server_conf, pconf);
+ rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
+ : APR_PROC_DETACH_DAEMONIZE);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00174)
+ "apr_proc_detach failed");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ }
+ }
+
+ parent_pid = ap_my_pid = getpid();
+
+ ap_listen_pre_config();
+ ap_daemons_to_start = DEFAULT_START_DAEMON;
+ ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
+ ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
+ server_limit = DEFAULT_SERVER_LIMIT;
+ ap_daemons_limit = server_limit;
+ ap_extended_status = 0;
+
+ return OK;
+}
+
+static int itk_check_config(apr_pool_t *p, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ int startup = 0;
+
+ /* the reverse of pre_config, we want this only the first time around */
+ if (retained->module_loads == 1) {
+ startup = 1;
+ }
+
+ if (server_limit > MAX_SERVER_LIMIT) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00175)
+ "WARNING: ServerLimit of %d exceeds compile-time "
+ "limit of", server_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " %d servers, decreasing to %d.",
+ MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00176)
+ "ServerLimit of %d exceeds compile-time limit "
+ "of %d, decreasing to match",
+ server_limit, MAX_SERVER_LIMIT);
+ }
+ server_limit = MAX_SERVER_LIMIT;
+ }
+ else if (server_limit < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00177)
+ "WARNING: ServerLimit of %d not allowed, "
+ "increasing to 1.", server_limit);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00178)
+ "ServerLimit of %d not allowed, increasing to 1",
+ server_limit);
+ }
+ server_limit = 1;
+ }
+
+ /* you cannot change ServerLimit across a restart; ignore
+ * any such attempts
+ */
+ if (!retained->first_server_limit) {
+ retained->first_server_limit = server_limit;
+ }
+ else if (server_limit != retained->first_server_limit) {
+ /* don't need a startup console version here */
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00179)
+ "changing ServerLimit to %d from original value of %d "
+ "not allowed during restart",
+ server_limit, retained->first_server_limit);
+ server_limit = retained->first_server_limit;
+ }
+
+ if (ap_daemons_limit > server_limit) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00180)
+ "WARNING: MaxRequestWorkers of %d exceeds ServerLimit "
+ "value of", ap_daemons_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " %d servers, decreasing MaxRequestWorkers to %d.",
+ server_limit, server_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " To increase, please see the ServerLimit "
+ "directive.");
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00181)
+ "MaxRequestWorkers of %d exceeds ServerLimit value "
+ "of %d, decreasing to match",
+ ap_daemons_limit, server_limit);
+ }
+ ap_daemons_limit = server_limit;
+ }
+ else if (ap_daemons_limit < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00182)
+ "WARNING: MaxRequestWorkers of %d not allowed, "
+ "increasing to 1.", ap_daemons_limit);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00183)
+ "MaxRequestWorkers of %d not allowed, increasing to 1",
+ ap_daemons_limit);
+ }
+ ap_daemons_limit = 1;
+ }
+
+ /* ap_daemons_to_start > ap_daemons_limit checked in itk_run() */
+ if (ap_daemons_to_start < 0) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00184)
+ "WARNING: StartServers of %d not allowed, "
+ "increasing to 1.", ap_daemons_to_start);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00185)
+ "StartServers of %d not allowed, increasing to 1",
+ ap_daemons_to_start);
+ }
+ ap_daemons_to_start = 1;
+ }
+
+ if (ap_daemons_min_free < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00186)
+ "WARNING: MinSpareServers of %d not allowed, "
+ "increasing to 1", ap_daemons_min_free);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " to avoid almost certain server failure.");
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " Please read the documentation.");
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00187)
+ "MinSpareServers of %d not allowed, increasing to 1",
+ ap_daemons_min_free);
+ }
+ ap_daemons_min_free = 1;
+ }
+
+ /* ap_daemons_max_free < ap_daemons_min_free + 1 checked in itk_run() */
+
+ return OK;
+}
+
+static int itk_post_perdir_config(request_rec *r)
+{
+ uid_t wanted_uid;
+ gid_t wanted_gid;
+ const char *wanted_username;
+ int err = 0;
+
+ itk_server_conf *sconf =
+ (itk_server_conf *) ap_get_module_config(r->server->module_config, &mpm_itk_module);
+ itk_per_dir_conf *dconf;
+
+ /* Enforce MaxClientsVhost. */
+ if (sconf->max_clients_vhost > 0) {
+ int i, num_other_servers = 0;
+ for (i = 0; i < ap_daemons_limit; ++i) {
+ worker_score *ws = &ap_scoreboard_image->servers[i][0];
+ if (ws->status >= SERVER_BUSY_READ && strncmp(ws->vhost, r->server->server_hostname, 31) == 0)
+ ++num_other_servers;
+ }
+
+ if (num_other_servers > sconf->max_clients_vhost) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \
+ "MaxClientsVhost reached for %s, refusing client.",
+ r->server->server_hostname);
+ return HTTP_SERVICE_UNAVAILABLE;
+ }
+ }
+
+ dconf = (itk_per_dir_conf *) ap_get_module_config(r->per_dir_config, &mpm_itk_module);
+
+ strncpy(ap_scoreboard_image->servers[my_child_num][0].vhost, r->server->server_hostname, 31);
+ ap_scoreboard_image->servers[my_child_num][0].vhost[31] = 0;
+
+ if (dconf->nice_value != UNSET_NICE_VALUE &&
+ setpriority(PRIO_PROCESS, 0, dconf->nice_value)) {
+ _DBG("setpriority(): %s", strerror(errno));
+ err = 1;
+ }
+
+ wanted_uid = dconf->uid;
+ wanted_gid = dconf->gid;
+ wanted_username = dconf->username;
+
+ if (wanted_uid == -1 || wanted_gid == -1) {
+ wanted_uid = ap_unixd_config.user_id;
+ wanted_gid = ap_unixd_config.group_id;
+ wanted_username = ap_unixd_config.user_name;
+ }
+
+ /* AssignUserIDExpr and AssignGroupIDExpr override AssignUserID and defaults. */
+ if (dconf->uid_expr != NULL) {
+ struct passwd *ent;
+ const char *err;
+ wanted_username = ap_expr_str_exec(r, dconf->uid_expr, &err);
+ if (err) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \
+ "Error while parsing AssignUserIDExpr expression: %s",
+ err);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ if (!(ent = getpwnam(wanted_username))) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \
+ "AssignUserIDExpr returned '%s', which is not a valid user name",
+ wanted_username);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ wanted_uid = ent->pw_uid;
+ }
+ if (dconf->gid_expr != NULL) {
+ struct group *ent;
+ const char *err;
+ const char *wanted_groupname = ap_expr_str_exec(r, dconf->gid_expr, &err);
+ if (err) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \
+ "Error while parsing AssignGroupIDExpr expression: %s",
+ err);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ if (!(ent = getgrnam(wanted_groupname))) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \
+ "AssignGroupIDExpr returned '%s', which is not a valid group name",
+ wanted_username);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ wanted_gid = ent->gr_gid;
+ }
+
+ if (!err && wanted_uid != -1 && wanted_gid != -1 && (getuid() != wanted_uid || getgid() != wanted_gid)) {
+ if (setgid(wanted_gid)) {
+ _DBG("setgid(%d): %s", wanted_gid, strerror(errno));
+ err = 1;
+ } else if (initgroups(wanted_username, wanted_gid)) {
+ _DBG("initgroups(%s, %d): %s", wanted_username, wanted_gid, strerror(errno));
+ err = 1;
+ } else if (setuid(wanted_uid)) {
+ _DBG("setuid(%d): %s", wanted_uid, strerror(errno));
+ err = 1;
+ }
+ }
+
+ /*
+ * Most likely a case of switching uid/gid within a persistent
+ * connection; the RFCs allow us to just close the connection
+ * at anytime, so we excercise our right. :-)
+ */
+ if (err) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \
+ "Couldn't set uid/gid/priority, closing connection.");
+ ap_lingering_close(r->connection);
+ exit(0);
+ }
+ return OK;
+}
+
+static void itk_hooks(apr_pool_t *p)
+{
+ /* Our open_logs hook function must run before the core's, or stderr
+ * will be redirected to a file, and the messages won't print to the
+ * console.
+ */
+ static const char *const aszSucc[] = {"core.c", NULL};
+
+ ap_hook_open_logs(itk_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+ /* we need to set the MPM state before other pre-config hooks use MPM query
+ * to retrieve it, so register as REALLY_FIRST
+ */
+ ap_hook_pre_config(itk_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+ ap_hook_check_config(itk_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_mpm(itk_run, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_mpm_query(itk_query, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_mpm_get_name(itk_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+
+ /* set the uid as fast as possible, but not before merging per-dir config */
+ ap_hook_header_parser(itk_post_perdir_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+}
+
+static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_daemons_to_start = atoi(arg);
+ return NULL;
+}
+
+static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_daemons_min_free = atoi(arg);
+ return NULL;
+}
+
+static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_daemons_max_free = atoi(arg);
+ return NULL;
+}
+
+static const char *set_max_clients (cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+ if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00188)
+ "MaxClients is deprecated, use MaxRequestWorkers "
+ "instead.");
+ }
+ ap_daemons_limit = atoi(arg);
+ return NULL;
+}
+
+static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ server_limit = atoi(arg);
+ return NULL;
+}
+
+static const char *assign_user_id (cmd_parms *cmd, void *ptr, const char *user_name, const char *group_name)
+{
+ itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr;
+
+ const char *err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS);
+ if (err) {
+ return err;
+ }
+
+ dconf->username = apr_pstrdup(cmd->pool, user_name);
+ dconf->uid = ap_uname2id(user_name);
+ dconf->gid = ap_gname2id(group_name);
+ return NULL;
+}
+
+static const char *assign_user_id_expr (cmd_parms *cmd, void *ptr, const char *user_name_expr)
+{
+ itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr;
+
+ const char *err;
+
+ err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS);
+ if (err) {
+ return err;
+ }
+
+ dconf->uid_expr = ap_expr_parse_cmd_mi(cmd,
+ user_name_expr,
+ AP_EXPR_FLAG_STRING_RESULT,
+ &err,
+ NULL,
+ AP_CORE_MODULE_INDEX);
+ if (err) {
+ return err;
+ }
+
+ return NULL;
+}
+
+static const char *assign_group_id_expr (cmd_parms *cmd, void *ptr, const char *group_name_expr)
+{
+ itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr;
+
+ const char *err;
+
+ err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS);
+ if (err) {
+ return err;
+ }
+
+ dconf->gid_expr = ap_expr_parse_cmd_mi(cmd,
+ group_name_expr,
+ AP_EXPR_FLAG_STRING_RESULT,
+ &err,
+ NULL,
+ AP_CORE_MODULE_INDEX);
+ if (err) {
+ return err;
+ }
+ return NULL;
+}
+
+static const char *set_max_clients_vhost (cmd_parms *cmd, void *dummy, const char *arg)
+{
+ itk_server_conf *sconf =
+ (itk_server_conf *) ap_get_module_config(cmd->server->module_config, &mpm_itk_module);
+ sconf->max_clients_vhost = atoi(arg);
+ return NULL;
+}
+
+static const char *set_nice_value (cmd_parms *cmd, void *ptr, const char *arg)
+{
+ itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr;
+ int nice_value = atoi(arg);
+
+ if (nice_value < -20) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "WARNING: NiceValue of %d is below -20, increasing NiceValue to -20.",
+ nice_value);
+ nice_value = -20;
+ }
+ else if (nice_value > 19) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "WARNING: NiceValue of %d is above 19, lowering NiceValue to 19.",
+ nice_value);
+ nice_value = 19;
+ }
+ dconf->nice_value = nice_value;
+ return NULL;
+}
+
+static const command_rec itk_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
+ "Number of child processes launched at server startup"),
+AP_INIT_TAKE1("MinSpareServers", set_min_free_servers, NULL, RSRC_CONF,
+ "Minimum number of idle children, to handle request spikes"),
+AP_INIT_TAKE1("MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF,
+ "Maximum number of idle children"),
+AP_INIT_TAKE1("MaxClients", set_max_clients, NULL, RSRC_CONF,
+ "Deprecated name of MaxRequestWorkers"),
+AP_INIT_TAKE1("MaxRequestWorkers", set_max_clients, NULL, RSRC_CONF,
+ "Maximum number of children alive at the same time"),
+AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+ "Maximum value of MaxRequestWorkers for this run of Apache"),
+AP_INIT_TAKE2("AssignUserID", assign_user_id, NULL, RSRC_CONF|ACCESS_CONF,
+ "Tie a virtual host to a specific child process."),
+AP_INIT_RAW_ARGS("AssignUserIDExpr", assign_user_id_expr, NULL, RSRC_CONF|ACCESS_CONF,
+ "Choose user ID given an expression. Will override AssignUserID."),
+AP_INIT_RAW_ARGS("AssignGroupIDExpr", assign_group_id_expr, NULL, RSRC_CONF|ACCESS_CONF,
+ "Choose group ID given an expression. Will override AssignUserID."),
+AP_INIT_TAKE1("MaxClientsVHost", set_max_clients_vhost, NULL, RSRC_CONF,
+ "Maximum number of children alive at the same time for this virtual host."),
+AP_INIT_TAKE1("NiceValue", set_nice_value, NULL, RSRC_CONF|ACCESS_CONF,
+ "Set nice value for the given vhost, from -20 (highest priority) to 19 (lowest priority)."),
+AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
+{ NULL }
+};
+
+/* == allocate a private per-dir config structure == */
+static void *itk_create_dir_config(apr_pool_t *p, char *dummy)
+{
+ itk_per_dir_conf *c = (itk_per_dir_conf *)
+ apr_pcalloc(p, sizeof(itk_per_dir_conf));
+ c->uid = c->gid = -1;
+ c->uid_expr = c->gid_expr = NULL;
+ c->nice_value = UNSET_NICE_VALUE;
+ return c;
+}
+
+/* == merge the parent per-dir config structure into ours == */
+static void *itk_merge_dir_config(apr_pool_t *p, void *parent_ptr, void *child_ptr)
+{
+ itk_per_dir_conf *c = (itk_per_dir_conf *)
+ itk_create_dir_config(p, NULL);
+ itk_per_dir_conf *parent = (itk_per_dir_conf *) parent_ptr;
+ itk_per_dir_conf *child = (itk_per_dir_conf *) child_ptr;
+
+ if (child->username != NULL) {
+ c->username = child->username;
+ c->uid = child->uid;
+ c->gid = child->gid;
+ } else {
+ c->username = parent->username;
+ c->uid = parent->uid;
+ c->gid = parent->gid;
+ }
+ if (child->uid_expr != NULL) {
+ c->uid_expr = child->uid_expr;
+ } else {
+ c->uid_expr = parent->uid_expr;
+ }
+ if (child->gid_expr != NULL) {
+ c->gid_expr = child->gid_expr;
+ } else {
+ c->gid_expr = parent->gid_expr;
+ }
+ if (child->nice_value != UNSET_NICE_VALUE) {
+ c->nice_value = child->nice_value;
+ } else {
+ c->nice_value = parent->nice_value;
+ }
+ return c;
+}
+
+/* == allocate a private server config structure == */
+static void *itk_create_server_config(apr_pool_t *p, server_rec *s)
+{
+ itk_server_conf *c = (itk_server_conf *)
+ apr_pcalloc(p, sizeof(itk_server_conf));
+ c->max_clients_vhost = -1;
+ return c;
+}
+
+AP_DECLARE_MODULE(mpm_itk) = {
+ MPM20_MODULE_STUFF,
+ NULL, /* hook to run before apache parses args */
+ itk_create_dir_config, /* create per-directory config structure */
+ itk_merge_dir_config, /* merge per-directory config structures */
+ itk_create_server_config, /* create per-server config structure */
+ NULL, /* merge per-server config structures */
+ itk_cmds, /* command apr_table_t */
+ itk_hooks, /* register hooks */
+};
Index: httpd-2.4.2/server/mpm/itk/mpm_default.h
===================================================================
--- /dev/null
+++ httpd-2.4.2/server/mpm/itk/mpm_default.h
@@ -0,0 +1,57 @@
+/* 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.
+ *
+ * Portions copyright 2005-2012 Steinar H. Gunderson <sgunderson@bigfoot.com>.
+ * Licensed under the same terms as the rest of Apache.
+ *
+ * Portions copyright 2008 Knut Auvor Grythe <knut@auvor.no>.
+ * Licensed under the same terms as the rest of Apache.
+ */
+
+/**
+ * @file itk/mpm_default.h
+ * @brief ITK MPM defaults
+ *
+ * @defgroup APACHE_MPM_ITK Apache ITK
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 5
+#endif
+
+/* Maximum number of *free* server processes --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_DAEMON
+#define DEFAULT_MAX_FREE_DAEMON 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_DAEMON
+#define DEFAULT_MIN_FREE_DAEMON 5
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
Index: httpd-2.4.2/server/mpm/config2.m4
===================================================================
--- httpd-2.4.2.orig/server/mpm/config2.m4
+++ httpd-2.4.2/server/mpm/config2.m4
@@ -1,7 +1,7 @@
AC_MSG_CHECKING(which MPM to use by default)
AC_ARG_WITH(mpm,
APACHE_HELP_STRING(--with-mpm=MPM,Choose the process model for Apache to use by default.
- MPM={event|worker|prefork|winnt}
+ MPM={event|worker|prefork|winnt|itk}
This will be statically linked as the only available MPM unless
--enable-mpms-shared is also specified.
),[
@@ -66,6 +66,9 @@ for i in $ap_enabled_mpms; do
else
AC_MSG_ERROR([MPM $i is not supported on this platform.])
fi
+ if test "$i" = "itk" ; then
+ AC_CHECK_LIB(cap, cap_init)
+ fi
done
if test $mpm_build = "shared"; then
Index: httpd-2.4.2/modules/arch/unix/config5.m4
===================================================================
--- httpd-2.4.2.orig/modules/arch/unix/config5.m4
+++ httpd-2.4.2/modules/arch/unix/config5.m4
@@ -3,6 +3,7 @@ APACHE_MODPATH_INIT(arch/unix)
if ap_mpm_is_enabled "worker" \
|| ap_mpm_is_enabled "event" \
+ || ap_mpm_is_enabled "itk" \
|| ap_mpm_is_enabled "prefork"; then
unixd_mods_enable=yes
else
Index: httpd-2.4.2/server/request.c
===================================================================
--- httpd-2.4.2.orig/server/request.c
+++ httpd-2.4.2/server/request.c
@@ -69,6 +69,7 @@ APR_HOOK_STRUCT(
APR_HOOK_LINK(auth_checker)
APR_HOOK_LINK(insert_filter)
APR_HOOK_LINK(create_request)
+ APR_HOOK_LINK(post_perdir_config)
)
AP_IMPLEMENT_HOOK_RUN_FIRST(int,translate_name,
@@ -91,10 +92,26 @@ AP_IMPLEMENT_HOOK_VOID(insert_filter, (r
AP_IMPLEMENT_HOOK_RUN_ALL(int, create_request,
(request_rec *r), (r), OK, DECLINED)
+/**
+ * This hook allows modules to affect the request immediately after the
+ * per-directory configuration for the request has been generated. This allows
+ * modules to make decisions based upon the current directory configuration
+ *
+ * This hook is private to mpm-itk, so it is not exposed in http_request.h.
+ *
+ * @param r The current request
+ * @return OK or DECLINED
+ */
+AP_DECLARE_HOOK(int,post_perdir_config,(request_rec *r))
+
+AP_IMPLEMENT_HOOK_RUN_ALL(int,post_perdir_config,
+ (request_rec *r), (r), OK, DECLINED)
+
static int auth_internal_per_conf = 0;
static int auth_internal_per_conf_hooks = 0;
static int auth_internal_per_conf_providers = 0;
+extern AP_DECLARE_DATA int ap_running_under_mpm_itk;
static int decl_die(int status, const char *phase, request_rec *r)
{
@@ -191,6 +208,13 @@ AP_DECLARE(int) ap_process_request_inter
r->log = d->log;
}
+ /* First chance to handle the request after per-directory configuration is
+ * generated
+ */
+ if ((access_status = ap_run_post_perdir_config(r))) {
+ return access_status;
+ }
+
/* Only on the main request! */
if (r->main == NULL) {
if ((access_status = ap_run_header_parser(r))) {
@@ -1093,6 +1117,16 @@ AP_DECLARE(int) ap_directory_walk(reques
break;
}
else if (APR_STATUS_IS_EACCES(rv)) {
+ /* See the corresponding section in server/config.c for the rationale
+ * behind this logic.
+ */
+ if (ap_running_under_mpm_itk && r->main == NULL && getuid() != 0) {
+ ap_log_rerror(APLOG_MARK, APLOG_WARNING, rv, r,
+ "Access to %s denied, closing connection.",
+ r->filename);
+ ap_lingering_close(r->connection);
+ exit(0);
+ }
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00035)
"access to %s denied (filesystem path '%s') "
"because search permissions are missing on a "
Index: httpd-2.4.2/server/config.c
===================================================================
--- httpd-2.4.2.orig/server/config.c
+++ httpd-2.4.2/server/config.c
@@ -69,6 +69,8 @@ AP_DECLARE_DATA apr_array_header_t *ap_s
AP_DECLARE_DATA ap_directive_t *ap_conftree = NULL;
+AP_DECLARE_DATA int ap_running_under_mpm_itk = 0;
+
APR_HOOK_STRUCT(
APR_HOOK_LINK(header_parser)
APR_HOOK_LINK(pre_config)
@@ -2129,6 +2131,32 @@ AP_CORE_DECLARE(int) ap_parse_htaccess(a
else {
if (!APR_STATUS_IS_ENOENT(status)
&& !APR_STATUS_IS_ENOTDIR(status)) {
+ /*
+ * If we are in a persistent connection, we might end up in a state
+ * where we can no longer read .htaccess files because we have already
+ * setuid(). This can either be because the previous request was for
+ * another vhost (basically the same problem as when setuid() fails in
+ * itk.c), or it can be because a .htaccess file is readable only by
+ * root.
+ *
+ * In any case, we don't want to give out a 403, since the request has
+ * a very real chance of succeeding on a fresh connection (where
+ * presumably uid=0). Thus, we give up serving the request on this
+ * TCP connection, and do a hard close of the socket. As long as we're
+ * in a persistent connection (and there _should_ not be a way this
+ * would happen on the first request in a connection, save for subrequests,
+ * which we special-case), this is allowed, as it is what happens on
+ * a timeout. The browser will simply open a new connection and try
+ * again (there's of course a performance hit, though, both due to
+ * the new connection setup and the fork() of a new server child).
+ */
+ if (ap_running_under_mpm_itk && r->main == NULL && getuid() != 0) {
+ ap_log_rerror(APLOG_MARK, APLOG_WARNING, status, r,
+ "Couldn't read %s, closing connection.",
+ filename);
+ ap_lingering_close(r->connection);
+ exit(0);
+ }
ap_log_rerror(APLOG_MARK, APLOG_CRIT, status, r, APLOGNO(00529)
"%s pcfg_openfile: unable to check htaccess file, "
"ensure it is readable and that '%s' "
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