/* 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. */ #include "apr.h" #include "apr_strings.h" #include "apr_portable.h" #include "apr_lib.h" #define APR_WANT_STRFUNC #include "apr_want.h" #if APR_HAVE_SYS_TYPES_H #include <sys/types.h> #endif #include "ap_config.h" #include "httpd.h" #include "http_log.h" #include "http_main.h" #include "http_core.h" #include "http_config.h" #include "ap_mpm.h" #include "mpm.h" #include "scoreboard.h" AP_DECLARE_DATA scoreboard *ap_scoreboard_image = NULL; AP_DECLARE_DATA const char *ap_scoreboard_fname = NULL; AP_DECLARE_DATA int ap_extended_status = 0; AP_DECLARE_DATA int ap_mod_status_reqtail = 0; #if APR_HAS_SHARED_MEMORY #include "apr_shm.h" #ifndef WIN32 static /* but must be exported to mpm_winnt */ #endif apr_shm_t *ap_scoreboard_shm = NULL; #endif APR_HOOK_STRUCT( APR_HOOK_LINK(pre_mpm) ) AP_IMPLEMENT_HOOK_RUN_ALL(int,pre_mpm, (apr_pool_t *p, ap_scoreboard_e sb_type), (p, sb_type),OK,DECLINED) static APR_OPTIONAL_FN_TYPE(ap_proxy_lb_workers) *proxy_lb_workers; struct ap_sb_handle_t { int child_num; int thread_num; }; static int server_limit, thread_limit, lb_limit; static apr_size_t scoreboard_size; /* * ToDo: * This function should be renamed to cleanup_shared * and it should handle cleaning up a scoreboard shared * between processes using any form of IPC (file, shared memory * segment, etc.). Leave it as is now because it is being used * by various MPMs. */ static apr_status_t ap_cleanup_shared_mem(void *d) { #if APR_HAS_SHARED_MEMORY free(ap_scoreboard_image); ap_scoreboard_image = NULL; apr_shm_destroy(ap_scoreboard_shm); #endif return APR_SUCCESS; } AP_DECLARE(int) ap_calc_scoreboard_size(void) { ap_mpm_query(AP_MPMQ_HARD_LIMIT_THREADS, &thread_limit); ap_mpm_query(AP_MPMQ_HARD_LIMIT_DAEMONS, &server_limit); if (!proxy_lb_workers) proxy_lb_workers = APR_RETRIEVE_OPTIONAL_FN(ap_proxy_lb_workers); if (proxy_lb_workers) lb_limit = proxy_lb_workers(); else lb_limit = 0; scoreboard_size = sizeof(global_score); scoreboard_size += sizeof(process_score) * server_limit; scoreboard_size += sizeof(worker_score) * server_limit * thread_limit; if (lb_limit) scoreboard_size += sizeof(lb_score) * lb_limit; return scoreboard_size; } void ap_init_scoreboard(void *shared_score) { char *more_storage; int i; ap_calc_scoreboard_size(); ap_scoreboard_image = calloc(1, sizeof(scoreboard) + server_limit * sizeof(worker_score *)); more_storage = shared_score; ap_scoreboard_image->global = (global_score *)more_storage; more_storage += sizeof(global_score); ap_scoreboard_image->parent = (process_score *)more_storage; more_storage += sizeof(process_score) * server_limit; ap_scoreboard_image->servers = (worker_score **)((char*)ap_scoreboard_image + sizeof(scoreboard)); for (i = 0; i < server_limit; i++) { ap_scoreboard_image->servers[i] = (worker_score *)more_storage; more_storage += thread_limit * sizeof(worker_score); } if (lb_limit) { ap_scoreboard_image->balancers = (lb_score *)more_storage; more_storage += lb_limit * sizeof(lb_score); } ap_assert(more_storage == (char*)shared_score + scoreboard_size); ap_scoreboard_image->global->server_limit = server_limit; ap_scoreboard_image->global->thread_limit = thread_limit; ap_scoreboard_image->global->lb_limit = lb_limit; } /** * Create a name-based scoreboard in the given pool using the * given filename. */ static apr_status_t create_namebased_scoreboard(apr_pool_t *pool, const char *fname) { #if APR_HAS_SHARED_MEMORY apr_status_t rv; /* The shared memory file must not exist before we create the * segment. */ apr_shm_remove(fname, pool); /* ignore errors */ rv = apr_shm_create(&ap_scoreboard_shm, scoreboard_size, fname, pool); if (rv != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, "unable to create or access scoreboard \"%s\" " "(name-based shared memory failure)", fname); return rv; } #endif /* APR_HAS_SHARED_MEMORY */ return APR_SUCCESS; } /* ToDo: This function should be made to handle setting up * a scoreboard shared between processes using any IPC technique, * not just a shared memory segment */ static apr_status_t open_scoreboard(apr_pool_t *pconf) { #if APR_HAS_SHARED_MEMORY apr_status_t rv; char *fname = NULL; apr_pool_t *global_pool; /* We don't want to have to recreate the scoreboard after * restarts, so we'll create a global pool and never clean it. */ rv = apr_pool_create(&global_pool, NULL); if (rv != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, "Fatal error: unable to create global pool " "for use with by the scoreboard"); return rv; } /* The config says to create a name-based shmem */ if (ap_scoreboard_fname) { /* make sure it's an absolute pathname */ fname = ap_server_root_relative(pconf, ap_scoreboard_fname); if (!fname) { ap_log_error(APLOG_MARK, APLOG_CRIT, APR_EBADPATH, NULL, "Fatal error: Invalid Scoreboard path %s", ap_scoreboard_fname); return APR_EBADPATH; } return create_namebased_scoreboard(global_pool, fname); } else { /* config didn't specify, we get to choose shmem type */ rv = apr_shm_create(&ap_scoreboard_shm, scoreboard_size, NULL, global_pool); /* anonymous shared memory */ if ((rv != APR_SUCCESS) && (rv != APR_ENOTIMPL)) { ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, "Unable to create or access scoreboard " "(anonymous shared memory failure)"); return rv; } /* Make up a filename and do name-based shmem */ else if (rv == APR_ENOTIMPL) { /* Make sure it's an absolute pathname */ ap_scoreboard_fname = DEFAULT_SCOREBOARD; fname = ap_server_root_relative(pconf, ap_scoreboard_fname); return create_namebased_scoreboard(global_pool, fname); } } #endif /* APR_HAS_SHARED_MEMORY */ return APR_SUCCESS; } /* If detach is non-zero, this is a seperate child process, * if zero, it is a forked child. */ apr_status_t ap_reopen_scoreboard(apr_pool_t *p, apr_shm_t **shm, int detached) { #if APR_HAS_SHARED_MEMORY if (!detached) { return APR_SUCCESS; } if (apr_shm_size_get(ap_scoreboard_shm) < scoreboard_size) { ap_log_error(APLOG_MARK, APLOG_CRIT, 0, NULL, "Fatal error: shared scoreboard too small for child!"); apr_shm_detach(ap_scoreboard_shm); ap_scoreboard_shm = NULL; return APR_EINVAL; } /* everything will be cleared shortly */ if (*shm) { *shm = ap_scoreboard_shm; } #endif return APR_SUCCESS; } apr_status_t ap_cleanup_scoreboard(void *d) { if (ap_scoreboard_image == NULL) { return APR_SUCCESS; } if (ap_scoreboard_image->global->sb_type == SB_SHARED) { ap_cleanup_shared_mem(NULL); } else { free(ap_scoreboard_image->global); free(ap_scoreboard_image); ap_scoreboard_image = NULL; } return APR_SUCCESS; } /* Create or reinit an existing scoreboard. The MPM can control whether * the scoreboard is shared across multiple processes or not */ int ap_create_scoreboard(apr_pool_t *p, ap_scoreboard_e sb_type) { int running_gen = 0; int i; #if APR_HAS_SHARED_MEMORY apr_status_t rv; #endif if (ap_scoreboard_image) { running_gen = ap_scoreboard_image->global->running_generation; ap_scoreboard_image->global->restart_time = apr_time_now(); memset(ap_scoreboard_image->parent, 0, sizeof(process_score) * server_limit); for (i = 0; i < server_limit; i++) { memset(ap_scoreboard_image->servers[i], 0, sizeof(worker_score) * thread_limit); } /* Clean up the lb workers data */ if (lb_limit) { memset(ap_scoreboard_image->balancers, 0, sizeof(lb_score) * lb_limit); } return OK; } ap_calc_scoreboard_size(); #if APR_HAS_SHARED_MEMORY if (sb_type == SB_SHARED) { void *sb_shared; rv = open_scoreboard(p); if (rv || !(sb_shared = apr_shm_baseaddr_get(ap_scoreboard_shm))) { return HTTP_INTERNAL_SERVER_ERROR; } memset(sb_shared, 0, scoreboard_size); ap_init_scoreboard(sb_shared); } else #endif { /* A simple malloc will suffice */ void *sb_mem = calloc(1, scoreboard_size); if (sb_mem == NULL) { ap_log_error(APLOG_MARK, APLOG_CRIT, 0, NULL, "(%d)%s: cannot allocate scoreboard", errno, strerror(errno)); return HTTP_INTERNAL_SERVER_ERROR; } ap_init_scoreboard(sb_mem); } ap_scoreboard_image->global->sb_type = sb_type; ap_scoreboard_image->global->running_generation = running_gen; ap_scoreboard_image->global->restart_time = apr_time_now(); apr_pool_cleanup_register(p, NULL, ap_cleanup_scoreboard, apr_pool_cleanup_null); return OK; } /* Routines called to deal with the scoreboard image * --- note that we do *not* need write locks, since update_child_status * only updates a *single* record in place, and only one process writes to * a given scoreboard slot at a time (either the child process owning that * slot, or the parent, noting that the child has died). * * As a final note --- setting the score entry to getpid() is always safe, * since when the parent is writing an entry, it's only noting SERVER_DEAD * anyway. */ AP_DECLARE(int) ap_exists_scoreboard_image(void) { return (ap_scoreboard_image ? 1 : 0); } AP_DECLARE(void) ap_increment_counts(ap_sb_handle_t *sb, request_rec *r) { worker_score *ws; if (!sb) return; ws = &ap_scoreboard_image->servers[sb->child_num][sb->thread_num]; #ifdef HAVE_TIMES times(&ws->times); #endif ws->access_count++; ws->my_access_count++; ws->conn_count++; ws->bytes_served += r->bytes_sent; ws->my_bytes_served += r->bytes_sent; ws->conn_bytes += r->bytes_sent; } int find_child_by_pid(apr_proc_t *pid) { int i; int max_daemons_limit; ap_mpm_query(AP_MPMQ_MAX_DAEMONS, &max_daemons_limit); for (i = 0; i < max_daemons_limit; ++i) { if (ap_scoreboard_image->parent[i].pid == pid->pid) { return i; } } return -1; } AP_DECLARE(void) ap_create_sb_handle(ap_sb_handle_t **new_sbh, apr_pool_t *p, int child_num, int thread_num) { *new_sbh = (ap_sb_handle_t *)apr_palloc(p, sizeof(ap_sb_handle_t)); (*new_sbh)->child_num = child_num; (*new_sbh)->thread_num = thread_num; } static void copy_request(char *rbuf, apr_size_t rbuflen, request_rec *r) { char *p; if (r->the_request == NULL) { apr_cpystrn(rbuf, "NULL", rbuflen); return; /* short circuit below */ } if (r->parsed_uri.password == NULL) { p = r->the_request; } else { /* Don't reveal the password in the server-status view */ p = apr_pstrcat(r->pool, r->method, " ", apr_uri_unparse(r->pool, &r->parsed_uri, APR_URI_UNP_OMITPASSWORD), r->assbackwards ? NULL : " ", r->protocol, NULL); } /* now figure out if we copy over the 1st rbuflen chars or the last */ if (!ap_mod_status_reqtail) { apr_cpystrn(rbuf, p, rbuflen); } else { apr_size_t slen = strlen(p); if (slen < rbuflen) { /* it all fits anyway */ apr_cpystrn(rbuf, p, rbuflen); } else { apr_cpystrn(rbuf, p+(slen-rbuflen+1), rbuflen); } } } AP_DECLARE(int) ap_update_child_status_from_indexes(int child_num, int thread_num, int status, request_rec *r) { int old_status; worker_score *ws; process_score *ps; if (child_num < 0) { return -1; } ws = &ap_scoreboard_image->servers[child_num][thread_num]; old_status = ws->status; ws->status = status; ps = &ap_scoreboard_image->parent[child_num]; if (status == SERVER_READY && old_status == SERVER_STARTING) { ws->thread_num = child_num * thread_limit + thread_num; ps->generation = ap_my_generation; } if (ap_extended_status) { ws->last_used = apr_time_now(); if (status == SERVER_READY || status == SERVER_DEAD) { /* * Reset individual counters */ if (status == SERVER_DEAD) { ws->my_access_count = 0L; ws->my_bytes_served = 0L; } ws->conn_count = 0; ws->conn_bytes = 0; } if (r) { conn_rec *c = r->connection; apr_cpystrn(ws->client, ap_get_remote_host(c, r->per_dir_config, REMOTE_NOLOOKUP, NULL), sizeof(ws->client)); copy_request(ws->request, sizeof(ws->request), r); apr_cpystrn(ws->vhost, r->server->server_hostname, sizeof(ws->vhost)); } } return old_status; } AP_DECLARE(int) ap_update_child_status(ap_sb_handle_t *sbh, int status, request_rec *r) { if (!sbh) return -1; return ap_update_child_status_from_indexes(sbh->child_num, sbh->thread_num, status, r); } void ap_time_process_request(ap_sb_handle_t *sbh, int status) { worker_score *ws; if (!sbh) return; if (sbh->child_num < 0) { return; } ws = &ap_scoreboard_image->servers[sbh->child_num][sbh->thread_num]; if (status == START_PREQUEST) { ws->start_time = apr_time_now(); } else if (status == STOP_PREQUEST) { ws->stop_time = apr_time_now(); } } AP_DECLARE(worker_score *) ap_get_scoreboard_worker(int x, int y) { if (((x < 0) || (server_limit < x)) || ((y < 0) || (thread_limit < y))) { return(NULL); /* Out of range */ } return &ap_scoreboard_image->servers[x][y]; } AP_DECLARE(process_score *) ap_get_scoreboard_process(int x) { if ((x < 0) || (server_limit < x)) { return(NULL); /* Out of range */ } return &ap_scoreboard_image->parent[x]; } AP_DECLARE(global_score *) ap_get_scoreboard_global() { return ap_scoreboard_image->global; } AP_DECLARE(lb_score *) ap_get_scoreboard_lb(int lb_num) { if (((lb_num < 0) || (lb_limit < lb_num))) { return(NULL); /* Out of range */ } return &ap_scoreboard_image->balancers[lb_num]; }
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