Adding upstream version 2.4.56.upstream/2.4.56

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

1 files changed, 578 insertions, 0 deletions

diff --git a/server/mpm_common.c b/server/mpm_common.c
new file mode 100644
index 0000000..9bcd760
--- /dev/null
+++ b/server/mpm_common.c
@@ -0,0 +1,578 @@
+/* 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.
+ */
+
+/* The purpose of this file is to store the code that MOST mpm's will need
+ * this does not mean a function only goes into this file if every MPM needs
+ * it.  It means that if a function is needed by more than one MPM, and
+ * future maintenance would be served by making the code common, then the
+ * function belongs here.
+ *
+ * This is going in src/main because it is not platform specific, it is
+ * specific to multi-process servers, but NOT to Unix.  Which is why it
+ * does not belong in src/os/unix
+ */
+
+#include "apr.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_strings.h"
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+#include "apr_getopt.h"
+#include "apr_optional.h"
+#include "apr_allocator.h"
+
+#include "httpd.h"
+#include "http_config.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "http_main.h"
+#include "mpm_common.h"
+#include "mod_core.h"
+#include "ap_mpm.h"
+#include "ap_listen.h"
+#include "util_mutex.h"
+
+#include "scoreboard.h"
+
+#ifdef HAVE_PWD_H
+#include <pwd.h>
+#endif
+#ifdef HAVE_GRP_H
+#include <grp.h>
+#endif
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+/* we know core's module_index is 0 */
+#undef APLOG_MODULE_INDEX
+#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX
+
+#define DEFAULT_HOOK_LINKS \
+    APR_HOOK_LINK(monitor) \
+    APR_HOOK_LINK(drop_privileges) \
+    APR_HOOK_LINK(mpm) \
+    APR_HOOK_LINK(mpm_query) \
+    APR_HOOK_LINK(mpm_register_timed_callback) \
+    APR_HOOK_LINK(mpm_get_name) \
+    APR_HOOK_LINK(end_generation) \
+    APR_HOOK_LINK(child_status) \
+    APR_HOOK_LINK(suspend_connection) \
+    APR_HOOK_LINK(resume_connection) \
+    APR_HOOK_LINK(child_stopping)
+
+#if AP_ENABLE_EXCEPTION_HOOK
+APR_HOOK_STRUCT(
+    APR_HOOK_LINK(fatal_exception)
+    DEFAULT_HOOK_LINKS
+)
+AP_IMPLEMENT_HOOK_RUN_ALL(int, fatal_exception,
+                          (ap_exception_info_t *ei), (ei), OK, DECLINED)
+#else
+APR_HOOK_STRUCT(
+    DEFAULT_HOOK_LINKS
+)
+#endif
+AP_IMPLEMENT_HOOK_RUN_ALL(int, monitor,
+                          (apr_pool_t *p, server_rec *s), (p, s), OK, DECLINED)
+AP_IMPLEMENT_HOOK_RUN_ALL(int, drop_privileges,
+                          (apr_pool_t * pchild, server_rec * s),
+                          (pchild, s), OK, DECLINED)
+AP_IMPLEMENT_HOOK_RUN_FIRST(int, mpm,
+                            (apr_pool_t *pconf, apr_pool_t *plog, server_rec *s),
+                            (pconf, plog, s), DECLINED)
+AP_IMPLEMENT_HOOK_RUN_FIRST(int, mpm_query,
+                            (int query_code, int *result, apr_status_t *_rv),
+                            (query_code, result, _rv), DECLINED)
+AP_IMPLEMENT_HOOK_RUN_FIRST(apr_status_t, mpm_register_timed_callback,
+                            (apr_time_t t, ap_mpm_callback_fn_t *cbfn, void *baton),
+                            (t, cbfn, baton), APR_ENOTIMPL)
+AP_IMPLEMENT_HOOK_VOID(end_generation,
+                       (server_rec *s, ap_generation_t gen),
+                       (s, gen))
+AP_IMPLEMENT_HOOK_VOID(child_status,
+                       (server_rec *s, pid_t pid, ap_generation_t gen, int slot, mpm_child_status status),
+                       (s,pid,gen,slot,status))
+AP_IMPLEMENT_HOOK_VOID(suspend_connection,
+                       (conn_rec *c, request_rec *r),
+                       (c, r))
+AP_IMPLEMENT_HOOK_VOID(resume_connection,
+                       (conn_rec *c, request_rec *r),
+                       (c, r))
+AP_IMPLEMENT_HOOK_VOID(child_stopping,
+                       (apr_pool_t *pchild, int graceful),
+                       (pchild, graceful))
+
+/* hooks with no args are implemented last, after disabling APR hook probes */
+#if defined(APR_HOOK_PROBES_ENABLED)
+#undef APR_HOOK_PROBES_ENABLED
+#undef APR_HOOK_PROBE_ENTRY
+#define APR_HOOK_PROBE_ENTRY(ud,ns,name,args)
+#undef APR_HOOK_PROBE_RETURN
+#define APR_HOOK_PROBE_RETURN(ud,ns,name,rv,args)
+#undef APR_HOOK_PROBE_INVOKE
+#define APR_HOOK_PROBE_INVOKE(ud,ns,name,src,args)
+#undef APR_HOOK_PROBE_COMPLETE
+#define APR_HOOK_PROBE_COMPLETE(ud,ns,name,src,rv,args)
+#undef APR_HOOK_INT_DCL_UD
+#define APR_HOOK_INT_DCL_UD
+#endif
+AP_IMPLEMENT_HOOK_RUN_FIRST(const char *, mpm_get_name,
+                            (void),
+                            (), NULL)
+
+typedef struct mpm_gen_info_t {
+    APR_RING_ENTRY(mpm_gen_info_t) link;
+    int gen;          /* which gen? */
+    int active;       /* number of active processes */
+    int done;         /* gen finished? (whether or not active processes) */
+} mpm_gen_info_t;
+
+APR_RING_HEAD(mpm_gen_info_head_t, mpm_gen_info_t);
+static struct mpm_gen_info_head_t *geninfo, *unused_geninfo;
+static int gen_head_init; /* yuck */
+
+/* variables representing config directives implemented here */
+AP_DECLARE_DATA const char *ap_pid_fname;
+AP_DECLARE_DATA int ap_max_requests_per_child;
+AP_DECLARE_DATA char ap_coredump_dir[MAX_STRING_LEN];
+AP_DECLARE_DATA int ap_coredumpdir_configured;
+AP_DECLARE_DATA int ap_graceful_shutdown_timeout;
+AP_DECLARE_DATA apr_uint32_t ap_max_mem_free;
+AP_DECLARE_DATA apr_size_t ap_thread_stacksize;
+
+#define ALLOCATOR_MAX_FREE_DEFAULT (2048*1024)
+
+/* Set defaults for config directives implemented here.  This is
+ * called from core's pre-config hook, so MPMs which need to override
+ * one of these should run their pre-config hook after that of core.
+ */
+void mpm_common_pre_config(apr_pool_t *pconf)
+{
+    ap_pid_fname = DEFAULT_PIDLOG;
+    ap_max_requests_per_child = 0; /* unlimited */
+    apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
+    ap_coredumpdir_configured = 0;
+    ap_graceful_shutdown_timeout = 0; /* unlimited */
+    ap_max_mem_free = ALLOCATOR_MAX_FREE_DEFAULT;
+    ap_thread_stacksize = 0; /* use system default */
+}
+
+/* number of calls to wait_or_timeout between writable probes */
+#ifndef INTERVAL_OF_WRITABLE_PROBES
+#define INTERVAL_OF_WRITABLE_PROBES 10
+#endif
+static int wait_or_timeout_counter;
+
+AP_DECLARE(void) ap_wait_or_timeout(apr_exit_why_e *status, int *exitcode,
+                                    apr_proc_t *ret, apr_pool_t *p,
+                                    server_rec *s)
+{
+    apr_status_t rv;
+
+    ++wait_or_timeout_counter;
+    if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
+        wait_or_timeout_counter = 0;
+        ap_run_monitor(p, s);
+    }
+
+    rv = apr_proc_wait_all_procs(ret, exitcode, status, APR_NOWAIT, p);
+    ap_update_global_status();
+
+    if (APR_STATUS_IS_EINTR(rv)) {
+        ret->pid = -1;
+        return;
+    }
+
+    if (APR_STATUS_IS_CHILD_DONE(rv)) {
+        return;
+    }
+
+    apr_sleep(apr_time_from_sec(1));
+    ret->pid = -1;
+}
+
+#if defined(TCP_NODELAY)
+void ap_sock_disable_nagle(apr_socket_t *s)
+{
+    /* The Nagle algorithm says that we should delay sending partial
+     * packets in hopes of getting more data.  We don't want to do
+     * this; we are not telnet.  There are bad interactions between
+     * persistent connections and Nagle's algorithm that have very severe
+     * performance penalties.  (Failing to disable Nagle is not much of a
+     * problem with simple HTTP.)
+     *
+     * In spite of these problems, failure here is not a shooting offense.
+     */
+    apr_status_t status = apr_socket_opt_set(s, APR_TCP_NODELAY, 1);
+
+    if (status != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, status, ap_server_conf, APLOGNO(00542)
+                     "apr_socket_opt_set: (TCP_NODELAY)");
+    }
+}
+#endif
+
+#ifdef HAVE_GETPWNAM
+AP_DECLARE(uid_t) ap_uname2id(const char *name)
+{
+    struct passwd *ent;
+
+    if (name[0] == '#')
+        return (atoi(&name[1]));
+
+    if (!(ent = getpwnam(name))) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00543)
+                     "%s: bad user name %s", ap_server_argv0, name);
+        exit(1);
+    }
+
+    return (ent->pw_uid);
+}
+#endif
+
+#ifdef HAVE_GETGRNAM
+AP_DECLARE(gid_t) ap_gname2id(const char *name)
+{
+    struct group *ent;
+
+    if (name[0] == '#')
+        return (atoi(&name[1]));
+
+    if (!(ent = getgrnam(name))) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00544)
+                     "%s: bad group name %s", ap_server_argv0, name);
+        exit(1);
+    }
+
+    return (ent->gr_gid);
+}
+#endif
+
+#ifndef HAVE_INITGROUPS
+int initgroups(const char *name, gid_t basegid)
+{
+#if defined(_OSD_POSIX) || defined(OS2) || defined(WIN32) || defined(NETWARE)
+    return 0;
+#else
+    gid_t groups[NGROUPS_MAX];
+    struct group *g;
+    int index = 0;
+
+    setgrent();
+
+    groups[index++] = basegid;
+
+    while (index < NGROUPS_MAX && ((g = getgrent()) != NULL)) {
+        if (g->gr_gid != basegid) {
+            char **names;
+
+            for (names = g->gr_mem; *names != NULL; ++names) {
+                if (!strcmp(*names, name))
+                    groups[index++] = g->gr_gid;
+            }
+        }
+    }
+
+    endgrent();
+
+    return setgroups(index, groups);
+#endif
+}
+#endif /* def HAVE_INITGROUPS */
+
+/* standard mpm configuration handling */
+
+const char *ap_mpm_set_pidfile(cmd_parms *cmd, void *dummy,
+                               const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    if (cmd->server->is_virtual) {
+        return "PidFile directive not allowed in <VirtualHost>";
+    }
+
+    ap_pid_fname = arg;
+    return NULL;
+}
+
+void ap_mpm_dump_pidfile(apr_pool_t *p, apr_file_t *out)
+{
+    apr_file_printf(out, "PidFile: \"%s\"\n",
+                    ap_server_root_relative(p, ap_pid_fname));
+}
+
+const char *ap_mpm_set_max_requests(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, "MaxRequestsPerChild")) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00545)
+                     "MaxRequestsPerChild is deprecated, use "
+                     "MaxConnectionsPerChild instead.");
+    }
+
+    ap_max_requests_per_child = atoi(arg);
+
+    return NULL;
+}
+
+const char *ap_mpm_set_coredumpdir(cmd_parms *cmd, void *dummy,
+                                   const char *arg)
+{
+    apr_finfo_t finfo;
+    const char *fname;
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    fname = ap_server_root_relative(cmd->temp_pool, arg);
+    if (!fname) {
+        return apr_pstrcat(cmd->pool, "Invalid CoreDumpDirectory path ",
+                           arg, NULL);
+    }
+    if (apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool) != APR_SUCCESS) {
+        return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
+                           " does not exist", NULL);
+    }
+    if (finfo.filetype != APR_DIR) {
+        return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
+                           " is not a directory", NULL);
+    }
+    apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
+    ap_coredumpdir_configured = 1;
+    return NULL;
+}
+
+AP_DECLARE(const char *)ap_mpm_set_graceful_shutdown(cmd_parms *cmd,
+                                                     void *dummy,
+                                                     const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+    ap_graceful_shutdown_timeout = atoi(arg);
+    return NULL;
+}
+
+const char *ap_mpm_set_max_mem_free(cmd_parms *cmd, void *dummy,
+                                    const char *arg)
+{
+    long value;
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    errno = 0;
+    value = strtol(arg, NULL, 10);
+    if (value < 0 || errno == ERANGE)
+        return apr_pstrcat(cmd->pool, "Invalid MaxMemFree value: ",
+                           arg, NULL);
+
+    ap_max_mem_free = (apr_uint32_t)value * 1024;
+
+    return NULL;
+}
+
+const char *ap_mpm_set_thread_stacksize(cmd_parms *cmd, void *dummy,
+                                        const char *arg)
+{
+    long value;
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    errno = 0;
+    value = strtol(arg, NULL, 10);
+    if (value < 0 || errno == ERANGE)
+        return apr_pstrcat(cmd->pool, "Invalid ThreadStackSize value: ",
+                           arg, NULL);
+
+    ap_thread_stacksize = (apr_size_t)value;
+
+    return NULL;
+}
+
+AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
+{
+    apr_status_t rv;
+
+    if (ap_run_mpm_query(query_code, result, &rv) == DECLINED) {
+        rv = APR_EGENERAL;
+    }
+
+    return rv;
+}
+
+static void end_gen(mpm_gen_info_t *gi)
+{
+    ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
+                 "end of generation %d", gi->gen);
+    ap_run_end_generation(ap_server_conf, gi->gen);
+    APR_RING_REMOVE(gi, link);
+    APR_RING_INSERT_HEAD(unused_geninfo, gi, mpm_gen_info_t, link);
+}
+
+apr_status_t ap_mpm_end_gen_helper(void *unused) /* cleanup on pconf */
+{
+    int gen = ap_config_generation - 1; /* differs from MPM generation */
+    mpm_gen_info_t *cur;
+
+    if (geninfo == NULL) {
+        /* initial pconf teardown, MPM hasn't run */
+        return APR_SUCCESS;
+    }
+
+    cur = APR_RING_FIRST(geninfo);
+    while (cur != APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link) &&
+           cur->gen != gen) {
+        cur = APR_RING_NEXT(cur, link);
+    }
+
+    if (cur == APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link)) {
+        /* last child of generation already exited */
+        ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
+                     "no record of generation %d", gen);
+    }
+    else {
+        cur->done = 1;
+        if (cur->active == 0) {
+            end_gen(cur);
+        }
+    }
+
+    return APR_SUCCESS;
+}
+
+/* core's child-status hook
+ * tracks number of remaining children per generation and
+ * runs the end-generation hook when the last child of
+ * a generation exits
+ */
+void ap_core_child_status(server_rec *s, pid_t pid,
+                          ap_generation_t gen, int slot,
+                          mpm_child_status status)
+{
+    mpm_gen_info_t *cur;
+    const char *status_msg = "unknown status";
+
+    if (!gen_head_init) { /* where to run this? */
+        gen_head_init = 1;
+        geninfo = apr_pcalloc(s->process->pool, sizeof *geninfo);
+        unused_geninfo = apr_pcalloc(s->process->pool, sizeof *unused_geninfo);
+        APR_RING_INIT(geninfo, mpm_gen_info_t, link);
+        APR_RING_INIT(unused_geninfo, mpm_gen_info_t, link);
+    }
+
+    cur = APR_RING_FIRST(geninfo);
+    while (cur != APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link) &&
+           cur->gen != gen) {
+        cur = APR_RING_NEXT(cur, link);
+    }
+
+    switch(status) {
+    case MPM_CHILD_STARTED:
+        status_msg = "started";
+        if (cur == APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link)) {
+            /* first child for this generation */
+            if (!APR_RING_EMPTY(unused_geninfo, mpm_gen_info_t, link)) {
+                cur = APR_RING_FIRST(unused_geninfo);
+                APR_RING_REMOVE(cur, link);
+                cur->active = cur->done = 0;
+            }
+            else {
+                cur = apr_pcalloc(s->process->pool, sizeof *cur);
+            }
+            cur->gen = gen;
+            APR_RING_ELEM_INIT(cur, link);
+            APR_RING_INSERT_HEAD(geninfo, cur, mpm_gen_info_t, link);
+        }
+        ap_random_parent_after_fork();
+        ++cur->active;
+        break;
+    case MPM_CHILD_EXITED:
+        ap_update_global_status();
+        status_msg = "exited";
+        if (cur == APR_RING_SENTINEL(geninfo, mpm_gen_info_t, link)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00546)
+                         "no record of generation %d of exiting child %" APR_PID_T_FMT,
+                         gen, pid);
+        }
+        else {
+            --cur->active;
+            if (!cur->active && cur->done) { /* no children, server has stopped/restarted */
+                end_gen(cur);
+            }
+        }
+        break;
+    case MPM_CHILD_LOST_SLOT:
+        status_msg = "lost slot";
+        /* we don't track by slot, so it doesn't matter */
+        break;
+    }
+    ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, s,
+                 "mpm child %" APR_PID_T_FMT " (gen %d/slot %d) %s",
+                 pid, gen, slot, status_msg);
+}
+
+AP_DECLARE(apr_status_t) ap_mpm_register_timed_callback(apr_time_t t, ap_mpm_callback_fn_t *cbfn, void *baton)
+{
+    return ap_run_mpm_register_timed_callback(t, cbfn, baton);
+}
+
+AP_DECLARE(const char *)ap_show_mpm(void)
+{
+    const char *name = ap_run_mpm_get_name();
+
+    if (!name) {
+        name = "";
+    }
+
+    return name;
+}
+
+AP_DECLARE(const char *)ap_check_mpm(void)
+{
+    static const char *last_mpm_name = NULL;
+
+    if (!_hooks.link_mpm || _hooks.link_mpm->nelts == 0)
+        return "No MPM loaded.";
+    else if (_hooks.link_mpm->nelts > 1)
+        return "More than one MPM loaded.";
+
+    if (last_mpm_name) {
+        if (strcmp(last_mpm_name, ap_show_mpm())) {
+            return "The MPM cannot be changed during restart.";
+        }
+    }
+    else {
+        last_mpm_name = apr_pstrdup(ap_pglobal, ap_show_mpm());
+    }
+
+    return NULL;
+}