diff options
Diffstat (limited to 'server/mpm_common.c')
| -rw-r--r-- | server/mpm_common.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/server/mpm_common.c b/server/mpm_common.c new file mode 100644 index 0000000..04f36d9 --- /dev/null +++ b/server/mpm_common.c @@ -0,0 +1,574 @@ +/* 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) + +#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)) + +/* 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; +} |