mirror of
https://github.com/php/php-src.git
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447 lines
8.9 KiB
C
447 lines
8.9 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 4 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2002 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.02 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_02.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Sascha Schumann <sascha@schumann.cx> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "php.h"
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#ifdef HAVE_LIBMM
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#include <unistd.h>
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#include <mm.h>
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#include <time.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include "php_session.h"
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#include "mod_mm.h"
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#include "SAPI.h"
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#ifdef ZTS
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# error mm is not thread-safe
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#endif
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#define PS_MM_FILE "session_mm_"
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/* For php_uint32 */
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#include "ext/standard/basic_functions.h"
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/*
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* this list holds all data associated with one session
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*/
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typedef struct ps_sd {
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struct ps_sd *next;
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php_uint32 hv; /* hash value of key */
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time_t ctime; /* time of last change */
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void *data;
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size_t datalen; /* amount of valid data */
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size_t alloclen; /* amount of allocated memory for data */
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char key[1]; /* inline key */
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} ps_sd;
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typedef struct {
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MM *mm;
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ps_sd **hash;
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php_uint32 hash_max;
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php_uint32 hash_cnt;
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pid_t owner;
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} ps_mm;
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static ps_mm *ps_mm_instance = NULL;
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#if 0
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#define ps_mm_debug(a) printf a
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#else
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#define ps_mm_debug(a)
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#endif
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static inline php_uint32 ps_sd_hash(const char *data, int len)
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{
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php_uint32 h;
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const char *e = data + len;
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for (h = 2166136261U; data < e; ) {
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h *= 16777619;
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h ^= *data++;
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}
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return h;
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}
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static void hash_split(ps_mm *data)
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{
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php_uint32 nmax;
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ps_sd **nhash;
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ps_sd **ohash, **ehash;
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ps_sd *ps, *next;
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nmax = ((data->hash_max + 1) << 1) - 1;
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nhash = mm_calloc(data->mm, nmax + 1, sizeof(*data->hash));
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if (!nhash) {
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/* no further memory to expand hash table */
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return;
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}
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ehash = data->hash + data->hash_max + 1;
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for (ohash = data->hash; ohash < ehash; ohash++) {
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for (ps = *ohash; ps; ps = next) {
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next = ps->next;
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ps->next = nhash[ps->hv & nmax];
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nhash[ps->hv & nmax] = ps;
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}
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}
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mm_free(data->mm, data->hash);
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data->hash = nhash;
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data->hash_max = nmax;
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}
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static ps_sd *ps_sd_new(ps_mm *data, const char *key)
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{
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php_uint32 hv, slot;
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ps_sd *sd;
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int keylen;
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keylen = strlen(key);
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sd = mm_malloc(data->mm, sizeof(ps_sd) + keylen);
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if (!sd) {
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php_error(E_WARNING, "mm_malloc failed, avail %d, err %s", mm_available(data->mm), mm_error());
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return NULL;
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}
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hv = ps_sd_hash(key, keylen);
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slot = hv & data->hash_max;
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sd->ctime = 0;
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sd->hv = hv;
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sd->data = NULL;
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sd->alloclen = sd->datalen = 0;
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memcpy(sd->key, key, keylen + 1);
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sd->next = data->hash[slot];
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data->hash[slot] = sd;
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data->hash_cnt++;
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if (!sd->next) {
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if (data->hash_cnt >= data->hash_max)
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hash_split(data);
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}
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ps_mm_debug(("inserting %s(%p) into slot %d\n", key, sd, slot));
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return sd;
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}
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static void ps_sd_destroy(ps_mm *data, ps_sd *sd)
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{
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php_uint32 slot;
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slot = ps_sd_hash(sd->key, strlen(sd->key)) & data->hash_max;
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if (data->hash[slot] == sd)
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data->hash[slot] = sd->next;
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else {
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ps_sd *prev;
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/* There must be some entry before the one we want to delete */
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for (prev = data->hash[slot]; prev->next != sd; prev = prev->next);
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prev->next = sd->next;
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}
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data->hash_cnt--;
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if (sd->data)
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mm_free(data->mm, sd->data);
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mm_free(data->mm, sd);
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}
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static ps_sd *ps_sd_lookup(ps_mm *data, const char *key, int rw)
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{
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php_uint32 hv, slot;
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ps_sd *ret, *prev;
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hv = ps_sd_hash(key, strlen(key));
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slot = hv & data->hash_max;
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for (prev = NULL, ret = data->hash[slot]; ret; prev = ret, ret = ret->next)
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if (ret->hv == hv && !strcmp(ret->key, key))
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break;
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if (ret && rw && ret != data->hash[slot]) {
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/* Move the entry to the top of the linked list */
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if (prev)
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prev->next = ret->next;
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ret->next = data->hash[slot];
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data->hash[slot] = ret;
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}
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ps_mm_debug(("lookup(%s): ret=%p,hv=%u,slot=%d\n", key, ret, hv, slot));
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return ret;
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}
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ps_module ps_mod_mm = {
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PS_MOD(mm)
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};
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#define PS_MM_DATA ps_mm *data = PS_GET_MOD_DATA()
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static int ps_mm_initialize(ps_mm *data, const char *path)
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{
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data->owner = getpid();
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data->mm = mm_create(0, path);
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if (!data->mm) {
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return FAILURE;
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}
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data->hash_cnt = 0;
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data->hash_max = 511;
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data->hash = mm_calloc(data->mm, data->hash_max + 1, sizeof(ps_sd *));
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if (!data->hash) {
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mm_destroy(data->mm);
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return FAILURE;
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}
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return SUCCESS;
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}
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static void ps_mm_destroy(ps_mm *data)
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{
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int h;
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ps_sd *sd, *next;
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/* This function is called during each module shutdown,
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but we must not release the shared memory pool, when
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an Apache child dies! */
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if (data->owner != getpid()) return;
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for (h = 0; h < data->hash_max + 1; h++)
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for (sd = data->hash[h]; sd; sd = next) {
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next = sd->next;
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ps_sd_destroy(data, sd);
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}
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mm_free(data->mm, data->hash);
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mm_destroy(data->mm);
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free(data);
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}
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PHP_MINIT_FUNCTION(ps_mm)
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{
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int save_path_len = strlen(PS(save_path));
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int mod_name_len = strlen(sapi_module.name);
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char *ps_mm_path, euid[30];
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int ret;
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ps_mm_instance = calloc(sizeof(*ps_mm_instance), 1);
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if (!ps_mm_instance)
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return FAILURE;
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if (!sprintf(euid,"%d", geteuid()))
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return FAILURE;
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/* Directory + '/' + File + Module Name + Effective UID + \0 */
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ps_mm_path = do_alloca(save_path_len+1+sizeof(PS_MM_FILE)+mod_name_len+strlen(euid)+1);
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memcpy(ps_mm_path, PS(save_path), save_path_len + 1);
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if (save_path_len > 0 && ps_mm_path[save_path_len - 1] != DEFAULT_SLASH) {
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ps_mm_path[save_path_len] = DEFAULT_SLASH;
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ps_mm_path[save_path_len+1] = '\0';
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}
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strcat(ps_mm_path, PS_MM_FILE);
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strcat(ps_mm_path, sapi_module.name);
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strcat(ps_mm_path, euid);
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ret = ps_mm_initialize(ps_mm_instance, ps_mm_path);
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free_alloca(ps_mm_path);
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if (ret != SUCCESS) {
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free(ps_mm_instance);
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ps_mm_instance = NULL;
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return FAILURE;
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}
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php_session_register_module(&ps_mod_mm);
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return SUCCESS;
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}
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PHP_MSHUTDOWN_FUNCTION(ps_mm)
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{
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if (ps_mm_instance) {
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ps_mm_destroy(ps_mm_instance);
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return SUCCESS;
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}
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return FAILURE;
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}
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PS_OPEN_FUNC(mm)
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{
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ps_mm_debug(("open: ps_mm_instance=%p\n", ps_mm_instance));
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if (!ps_mm_instance)
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return FAILURE;
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PS_SET_MOD_DATA(ps_mm_instance);
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return SUCCESS;
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}
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PS_CLOSE_FUNC(mm)
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{
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PS_SET_MOD_DATA(NULL);
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return SUCCESS;
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}
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PS_READ_FUNC(mm)
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{
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PS_MM_DATA;
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ps_sd *sd;
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int ret = FAILURE;
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mm_lock(data->mm, MM_LOCK_RD);
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sd = ps_sd_lookup(data, key, 0);
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if (sd) {
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*vallen = sd->datalen;
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*val = emalloc(sd->datalen + 1);
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memcpy(*val, sd->data, sd->datalen);
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(*val)[sd->datalen] = '\0';
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ret = SUCCESS;
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}
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mm_unlock(data->mm);
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return ret;
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}
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PS_WRITE_FUNC(mm)
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{
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PS_MM_DATA;
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ps_sd *sd;
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mm_lock(data->mm, MM_LOCK_RW);
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sd = ps_sd_lookup(data, key, 1);
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if (!sd) {
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sd = ps_sd_new(data, key);
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ps_mm_debug(("new entry for %s\n", key));
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}
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if (sd) {
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if (vallen >= sd->alloclen) {
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if (data->mm)
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mm_free(data->mm, sd->data);
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sd->alloclen = vallen + 1;
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sd->data = mm_malloc(data->mm, sd->alloclen);
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if (!sd->data) {
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ps_sd_destroy(data, sd);
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php_error(E_WARNING, "cannot allocate new data segment");
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sd = NULL;
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}
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}
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if (sd) {
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sd->datalen = vallen;
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memcpy(sd->data, val, vallen);
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time(&sd->ctime);
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}
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}
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mm_unlock(data->mm);
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return sd ? SUCCESS : FAILURE;
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}
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PS_DESTROY_FUNC(mm)
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{
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PS_MM_DATA;
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ps_sd *sd;
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mm_lock(data->mm, MM_LOCK_RW);
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sd = ps_sd_lookup(data, key, 0);
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if (sd)
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ps_sd_destroy(data, sd);
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mm_unlock(data->mm);
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return SUCCESS;
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}
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PS_GC_FUNC(mm)
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{
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PS_MM_DATA;
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time_t limit;
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ps_sd **ohash, **ehash;
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ps_sd *sd, *next;
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*nrdels = 0;
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ps_mm_debug(("gc\n"));
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time(&limit);
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limit -= maxlifetime;
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mm_lock(data->mm, MM_LOCK_RW);
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ehash = data->hash + data->hash_max + 1;
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for (ohash = data->hash; ohash < ehash; ohash++)
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for (sd = *ohash; sd; sd = next) {
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next = sd->next;
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if (sd->ctime < limit) {
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ps_mm_debug(("purging %s\n", sd->key));
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ps_sd_destroy(data, sd);
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(*nrdels)++;
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}
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}
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mm_unlock(data->mm);
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return SUCCESS;
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}
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zend_module_entry php_session_mm_module = {
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STANDARD_MODULE_HEADER,
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"session mm",
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NULL,
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PHP_MINIT(ps_mm), PHP_MSHUTDOWN(ps_mm),
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NULL, NULL,
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NULL,
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NO_VERSION_YET,
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STANDARD_MODULE_PROPERTIES
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};
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#endif
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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