| /* 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. |
| */ |
| |
| /* |
| * util_mutex.c: Useful functions for determining allowable |
| * mutexes and mutex settings |
| */ |
| |
| |
| #include "apr.h" |
| #include "apr_hash.h" |
| #include "apr_strings.h" |
| #include "apr_lib.h" |
| |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_main.h" |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_log.h" |
| #include "util_mutex.h" |
| #if AP_NEED_SET_MUTEX_PERMS |
| #include "unixd.h" |
| #endif |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> /* getpid() */ |
| #endif |
| |
| /* we know core's module_index is 0 */ |
| #undef APLOG_MODULE_INDEX |
| #define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX |
| |
| AP_DECLARE(apr_status_t) ap_parse_mutex(const char *arg, apr_pool_t *pool, |
| apr_lockmech_e *mutexmech, |
| const char **mutexfile) |
| { |
| /* Split arg into meth and file */ |
| char *meth = apr_pstrdup(pool, arg); |
| char *file = strchr(meth, ':'); |
| if (file) { |
| *(file++) = '\0'; |
| if (!*file) { |
| file = NULL; |
| } |
| } |
| |
| /* APR determines temporary filename unless overridden below, |
| * we presume file indicates an mutexfile is a file path |
| * unless the method sets mutexfile=file and NULLs file |
| */ |
| *mutexfile = NULL; |
| |
| if (!strcasecmp(meth, "none") || !strcasecmp(meth, "no")) { |
| return APR_ENOLOCK; |
| } |
| |
| /* NOTE: previously, 'yes' implied 'sem' */ |
| if (!strcasecmp(meth, "default") || !strcasecmp(meth, "yes")) { |
| *mutexmech = APR_LOCK_DEFAULT; |
| } |
| #if APR_HAS_FCNTL_SERIALIZE |
| else if (!strcasecmp(meth, "fcntl") || !strcasecmp(meth, "file")) { |
| *mutexmech = APR_LOCK_FCNTL; |
| } |
| #endif |
| #if APR_HAS_FLOCK_SERIALIZE |
| else if (!strcasecmp(meth, "flock") || !strcasecmp(meth, "file")) { |
| *mutexmech = APR_LOCK_FLOCK; |
| } |
| #endif |
| #if APR_HAS_POSIXSEM_SERIALIZE |
| else if (!strcasecmp(meth, "posixsem") || !strcasecmp(meth, "sem")) { |
| *mutexmech = APR_LOCK_POSIXSEM; |
| /* Posix/SysV semaphores aren't file based, use the literal name |
| * if provided and fall back on APR's default if not. Today, APR |
| * will ignore it, but once supported it has an absurdly short limit. |
| */ |
| if (file) { |
| *mutexfile = apr_pstrdup(pool, file); |
| |
| file = NULL; |
| } |
| } |
| #endif |
| #if APR_HAS_SYSVSEM_SERIALIZE |
| else if (!strcasecmp(meth, "sysvsem") || !strcasecmp(meth, "sem")) { |
| *mutexmech = APR_LOCK_SYSVSEM; |
| } |
| #endif |
| #if APR_HAS_PROC_PTHREAD_SERIALIZE |
| else if (!strcasecmp(meth, "pthread")) { |
| *mutexmech = APR_LOCK_PROC_PTHREAD; |
| } |
| #endif |
| else { |
| return APR_ENOTIMPL; |
| } |
| |
| /* Unless the method above assumed responsibility for setting up |
| * mutexfile and NULLing out file, presume it is a file we |
| * are looking to use |
| */ |
| if (file) { |
| *mutexfile = ap_server_root_relative(pool, file); |
| if (!*mutexfile) { |
| return APR_BADARG; |
| } |
| } |
| |
| return APR_SUCCESS; |
| } |
| |
| typedef struct { |
| apr_int32_t options; |
| int set; |
| int none; |
| int omit_pid; |
| apr_lockmech_e mech; |
| const char *dir; |
| } mutex_cfg_t; |
| |
| /* hash is created the first time a module calls ap_mutex_register(), |
| * rather than attempting to be the REALLY_REALLY_FIRST pre-config |
| * hook; it is cleaned up when the associated pool goes away; assume |
| * pconf is the pool passed to ap_mutex_register() |
| */ |
| static apr_hash_t *mxcfg_by_type; |
| |
| AP_DECLARE_NONSTD(void) ap_mutex_init(apr_pool_t *p) |
| { |
| mutex_cfg_t *def; |
| |
| if (mxcfg_by_type) { |
| return; |
| } |
| |
| mxcfg_by_type = apr_hash_make(p); |
| apr_pool_cleanup_register(p, &mxcfg_by_type, ap_pool_cleanup_set_null, |
| apr_pool_cleanup_null); |
| |
| /* initialize default mutex configuration */ |
| def = apr_pcalloc(p, sizeof *def); |
| def->mech = APR_LOCK_DEFAULT; |
| def->dir = ap_runtime_dir_relative(p, ""); |
| apr_hash_set(mxcfg_by_type, "default", APR_HASH_KEY_STRING, def); |
| } |
| |
| AP_DECLARE_NONSTD(const char *)ap_set_mutex(cmd_parms *cmd, void *dummy, |
| const char *arg) |
| { |
| apr_pool_t *p = cmd->pool; |
| apr_pool_t *ptemp = cmd->temp_pool; |
| const char **elt; |
| const char *mechdir; |
| int no_mutex = 0, omit_pid = 0; |
| apr_array_header_t *type_list; |
| apr_lockmech_e mech; |
| apr_status_t rv; |
| const char *mutexdir; |
| mutex_cfg_t *mxcfg; |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| |
| if (err != NULL) { |
| return err; |
| } |
| |
| mechdir = ap_getword_conf(cmd->pool, &arg); |
| if (*mechdir == '\0') { |
| return "Mutex requires at least a mechanism argument (" |
| AP_ALL_AVAILABLE_MUTEXES_STRING ")"; |
| } |
| |
| rv = ap_parse_mutex(mechdir, p, &mech, &mutexdir); |
| if (rv == APR_ENOTIMPL) { |
| return apr_pstrcat(p, "Invalid Mutex argument ", mechdir, |
| " (" AP_ALL_AVAILABLE_MUTEXES_STRING ")", NULL); |
| } |
| else if (rv == APR_BADARG |
| || (mutexdir && !ap_is_directory(ptemp, mutexdir))) { |
| return apr_pstrcat(p, "Invalid Mutex directory in argument ", |
| mechdir, NULL); |
| } |
| else if (rv == APR_ENOLOCK) { /* "none" */ |
| no_mutex = 1; |
| } |
| |
| /* "OmitPID" can appear at the end of the list, so build a list of |
| * mutex type names while looking for "OmitPID" (anywhere) or the end |
| */ |
| type_list = apr_array_make(cmd->pool, 4, sizeof(const char *)); |
| while (*arg) { |
| const char *s = ap_getword_conf(cmd->pool, &arg); |
| |
| if (!strcasecmp(s, "omitpid")) { |
| omit_pid = 1; |
| } |
| else { |
| const char **new_type = (const char **)apr_array_push(type_list); |
| *new_type = s; |
| } |
| } |
| |
| if (apr_is_empty_array(type_list)) { /* no mutex type? assume "default" */ |
| const char **new_type = (const char **)apr_array_push(type_list); |
| *new_type = "default"; |
| } |
| |
| while ((elt = (const char **)apr_array_pop(type_list)) != NULL) { |
| const char *type = *elt; |
| mxcfg = apr_hash_get(mxcfg_by_type, type, APR_HASH_KEY_STRING); |
| if (!mxcfg) { |
| return apr_psprintf(p, "Mutex type %s is not valid", type); |
| } |
| |
| mxcfg->none = 0; /* in case that was the default */ |
| mxcfg->omit_pid = omit_pid; |
| |
| mxcfg->set = 1; |
| if (no_mutex) { |
| if (!(mxcfg->options & AP_MUTEX_ALLOW_NONE)) { |
| return apr_psprintf(p, |
| "None is not allowed for mutex type %s", |
| type); |
| } |
| mxcfg->none = 1; |
| } |
| else { |
| mxcfg->mech = mech; |
| if (mutexdir) { /* retain mutex default if not configured */ |
| mxcfg->dir = mutexdir; |
| } |
| } |
| } |
| |
| return NULL; |
| } |
| |
| AP_DECLARE(apr_status_t) ap_mutex_register(apr_pool_t *pconf, |
| const char *type, |
| const char *default_dir, |
| apr_lockmech_e default_mech, |
| apr_int32_t options) |
| { |
| mutex_cfg_t *mxcfg = apr_pcalloc(pconf, sizeof *mxcfg); |
| |
| if ((options & ~(AP_MUTEX_ALLOW_NONE | AP_MUTEX_DEFAULT_NONE))) { |
| return APR_EINVAL; |
| } |
| |
| ap_mutex_init(pconf); /* in case this mod's pre-config ran before core's */ |
| |
| mxcfg->options = options; |
| if (options & AP_MUTEX_DEFAULT_NONE) { |
| mxcfg->none = 1; |
| } |
| mxcfg->dir = default_dir; /* usually NULL */ |
| mxcfg->mech = default_mech; /* usually APR_LOCK_DEFAULT */ |
| apr_hash_set(mxcfg_by_type, type, APR_HASH_KEY_STRING, mxcfg); |
| |
| return APR_SUCCESS; |
| } |
| |
| static int mutex_needs_file(apr_lockmech_e mech) |
| { |
| if (mech != APR_LOCK_FLOCK |
| && mech != APR_LOCK_FCNTL |
| #if APR_USE_FLOCK_SERIALIZE || APR_USE_FCNTL_SERIALIZE |
| && mech != APR_LOCK_DEFAULT |
| #endif |
| ) { |
| return 0; |
| } |
| return 1; |
| } |
| |
| static const char *get_mutex_filename(apr_pool_t *p, mutex_cfg_t *mxcfg, |
| const char *type, |
| const char *instance_id) |
| { |
| const char *pid_suffix = ""; |
| |
| if (!mutex_needs_file(mxcfg->mech)) { |
| return NULL; |
| } |
| |
| #if HAVE_UNISTD_H |
| if (!mxcfg->omit_pid) { |
| pid_suffix = apr_psprintf(p, ".%" APR_PID_T_FMT, getpid()); |
| } |
| #endif |
| |
| return ap_server_root_relative(p, |
| apr_pstrcat(p, |
| mxcfg->dir, |
| "/", |
| type, |
| instance_id ? "-" : "", |
| instance_id ? instance_id : "", |
| pid_suffix, |
| NULL)); |
| } |
| |
| static mutex_cfg_t *mxcfg_lookup(apr_pool_t *p, const char *type) |
| { |
| mutex_cfg_t *defcfg, *mxcfg, *newcfg; |
| |
| defcfg = apr_hash_get(mxcfg_by_type, "default", APR_HASH_KEY_STRING); |
| |
| /* MUST exist in table, or wasn't registered */ |
| mxcfg = apr_hash_get(mxcfg_by_type, type, APR_HASH_KEY_STRING); |
| if (!mxcfg) { |
| return NULL; |
| } |
| |
| /* order of precedence: |
| * 1. Mutex directive for this mutex |
| * 2. Mutex directive for "default" |
| * 3. Defaults for this mutex from ap_mutex_register() |
| * 4. Global defaults |
| */ |
| |
| if (mxcfg->set) { |
| newcfg = mxcfg; |
| } |
| else if (defcfg->set) { |
| newcfg = defcfg; |
| } |
| else if (mxcfg->none || mxcfg->mech != APR_LOCK_DEFAULT) { |
| newcfg = mxcfg; |
| } |
| else { |
| newcfg = defcfg; |
| } |
| |
| if (!newcfg->none && mutex_needs_file(newcfg->mech) && !newcfg->dir) { |
| /* a file-based mutex mechanism was configured, but |
| * without a mutex file directory; go back through |
| * the chain to find the directory, store in new |
| * mutex cfg structure |
| */ |
| newcfg = apr_pmemdup(p, newcfg, sizeof *newcfg); |
| |
| /* !true if dir not already set: mxcfg->set && defcfg->dir */ |
| if (defcfg->set && defcfg->dir) { |
| newcfg->dir = defcfg->dir; |
| } |
| else if (mxcfg->dir) { |
| newcfg->dir = mxcfg->dir; |
| } |
| else { |
| newcfg->dir = defcfg->dir; |
| } |
| } |
| |
| return newcfg; |
| } |
| |
| static void log_bad_create_options(server_rec *s, const char *type) |
| { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(00021) |
| "Invalid options were specified when creating the %s mutex", |
| type); |
| } |
| |
| static void log_unknown_type(server_rec *s, const char *type) |
| { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(00022) |
| "Can't create mutex of unknown type %s", type); |
| } |
| |
| static void log_create_failure(apr_status_t rv, server_rec *s, const char *type, |
| const char *fname) |
| { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00023) |
| "Couldn't create the %s mutex %s%s%s", type, |
| fname ? "(file " : "", |
| fname ? fname : "", |
| fname ? ")" : ""); |
| } |
| |
| #ifdef AP_NEED_SET_MUTEX_PERMS |
| static void log_perms_failure(apr_status_t rv, server_rec *s, const char *type) |
| { |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00024) |
| "Couldn't set permissions on the %s mutex; " |
| "check User and Group directives", |
| type); |
| } |
| #endif |
| |
| AP_DECLARE(apr_status_t) ap_global_mutex_create(apr_global_mutex_t **mutex, |
| const char **name, |
| const char *type, |
| const char *instance_id, |
| server_rec *s, apr_pool_t *p, |
| apr_int32_t options) |
| { |
| apr_status_t rv; |
| const char *fname; |
| mutex_cfg_t *mxcfg = mxcfg_lookup(p, type); |
| |
| if (options) { |
| log_bad_create_options(s, type); |
| return APR_EINVAL; |
| } |
| |
| if (!mxcfg) { |
| log_unknown_type(s, type); |
| return APR_EINVAL; |
| } |
| |
| if (mxcfg->none) { |
| *mutex = NULL; |
| return APR_SUCCESS; |
| } |
| |
| fname = get_mutex_filename(p, mxcfg, type, instance_id); |
| |
| rv = apr_global_mutex_create(mutex, fname, mxcfg->mech, p); |
| if (rv != APR_SUCCESS) { |
| log_create_failure(rv, s, type, fname); |
| return rv; |
| } |
| |
| if (name) |
| *name = fname; |
| |
| #ifdef AP_NEED_SET_MUTEX_PERMS |
| rv = ap_unixd_set_global_mutex_perms(*mutex); |
| if (rv != APR_SUCCESS) { |
| log_perms_failure(rv, s, type); |
| } |
| #endif |
| |
| return rv; |
| } |
| |
| AP_DECLARE(apr_status_t) ap_proc_mutex_create(apr_proc_mutex_t **mutex, |
| const char **name, |
| const char *type, |
| const char *instance_id, |
| server_rec *s, apr_pool_t *p, |
| apr_int32_t options) |
| { |
| apr_status_t rv; |
| const char *fname; |
| mutex_cfg_t *mxcfg = mxcfg_lookup(p, type); |
| |
| if (options) { |
| log_bad_create_options(s, type); |
| return APR_EINVAL; |
| } |
| |
| if (!mxcfg) { |
| log_unknown_type(s, type); |
| return APR_EINVAL; |
| } |
| |
| if (mxcfg->none) { |
| *mutex = NULL; |
| return APR_SUCCESS; |
| } |
| |
| fname = get_mutex_filename(p, mxcfg, type, instance_id); |
| |
| rv = apr_proc_mutex_create(mutex, fname, mxcfg->mech, p); |
| if (rv != APR_SUCCESS) { |
| log_create_failure(rv, s, type, fname); |
| return rv; |
| } |
| |
| if (name) |
| *name = fname; |
| |
| #ifdef AP_NEED_SET_MUTEX_PERMS |
| rv = ap_unixd_set_proc_mutex_perms(*mutex); |
| if (rv != APR_SUCCESS) { |
| log_perms_failure(rv, s, type); |
| } |
| #endif |
| |
| return rv; |
| } |
| |
| AP_CORE_DECLARE(void) ap_dump_mutexes(apr_pool_t *p, server_rec *s, apr_file_t *out) |
| { |
| apr_hash_index_t *idx; |
| mutex_cfg_t *defcfg = apr_hash_get(mxcfg_by_type, "default", APR_HASH_KEY_STRING); |
| for (idx = apr_hash_first(p, mxcfg_by_type); idx; idx = apr_hash_next(idx)) |
| { |
| mutex_cfg_t *mxcfg; |
| const char *name, *mech = "<unknown>"; |
| const void *name_; |
| const char *dir = ""; |
| apr_hash_this(idx, &name_, NULL, NULL); |
| name = name_; |
| mxcfg = mxcfg_lookup(p, name); |
| if (mxcfg == defcfg && strcmp(name, "default") != 0) { |
| apr_file_printf(out, "Mutex %s: using_defaults\n", name); |
| continue; |
| } |
| if (mxcfg->none) { |
| apr_file_printf(out, "Mutex %s: none\n", name); |
| continue; |
| } |
| switch (mxcfg->mech) { |
| case APR_LOCK_DEFAULT: |
| mech = "default"; |
| break; |
| #if APR_HAS_FCNTL_SERIALIZE |
| case APR_LOCK_FCNTL: |
| mech = "fcntl"; |
| break; |
| #endif |
| #if APR_HAS_FLOCK_SERIALIZE |
| case APR_LOCK_FLOCK: |
| mech = "flock"; |
| break; |
| #endif |
| #if APR_HAS_POSIXSEM_SERIALIZE |
| case APR_LOCK_POSIXSEM: |
| mech = "posixsem"; |
| break; |
| #endif |
| #if APR_HAS_SYSVSEM_SERIALIZE |
| case APR_LOCK_SYSVSEM: |
| mech = "sysvsem"; |
| break; |
| #endif |
| #if APR_HAS_PROC_PTHREAD_SERIALIZE |
| case APR_LOCK_PROC_PTHREAD: |
| mech = "pthread"; |
| break; |
| #endif |
| default: |
| ap_assert(0); |
| } |
| |
| if (mxcfg->dir) |
| dir = ap_server_root_relative(p, mxcfg->dir); |
| |
| apr_file_printf(out, "Mutex %s: dir=\"%s\" mechanism=%s %s\n", name, dir, mech, |
| mxcfg->omit_pid ? "[OmitPid]" : ""); |
| } |
| } |
