Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

328 lines (267 sloc) 7.625 kb
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "common-internal.h"
#include "spawner.h"
#include "logger_writer.h"
#include "util.h"
#include <unistd.h>
#include <signal.h>
#include <sys/sem.h>
#define SEM_LAUNCH_START 0
#define SEM_LAUNCH_READY 1
#define SEM_LAUNCH_TOTAL 2
#define ENTRIES "spawn,spawner"
cherokee_shm_t cherokee_spawn_shared;
int cherokee_spawn_sem;
static cherokee_boolean_t _active = true;
CHEROKEE_MUTEX_T (spawning_mutex);
ret_t
cherokee_spawner_set_active (cherokee_boolean_t active)
{
_active = active;
return ret_ok;
}
ret_t
cherokee_spawner_init (void)
{
#ifdef HAVE_POSIX_SHM
ret_t ret;
cherokee_buffer_t name = CHEROKEE_BUF_INIT;
if (! _active) {
return ret_ok;
}
/* Monitor mutex */
CHEROKEE_MUTEX_INIT (&spawning_mutex, CHEROKEE_MUTEX_FAST);
/* Shared memory */
cherokee_buffer_add_va (&name, TMPDIR "/cherokee-spawner-%d", getppid());
ret = cherokee_shm_init (&cherokee_spawn_shared);
if (ret != ret_ok) {
goto error;
}
ret = cherokee_shm_map (&cherokee_spawn_shared, &name);
if (ret != ret_ok) {
goto error;
}
/* Semaphore */
cherokee_spawn_sem = semget (getppid(), 0, 0);
if (cherokee_spawn_sem < 0) {
goto error;
}
TRACE (ENTRIES",sem", "Got semaphore %d\n", cherokee_spawn_sem);
cherokee_buffer_mrproper (&name);
return ret_ok;
error:
LOG_ERRNO (errno, cherokee_err_warning, CHEROKEE_ERROR_SPAWNER_TMP_INIT, name.buf);
cherokee_buffer_mrproper (&name);
return ret_error;
#else
return ret_not_found;
#endif
}
ret_t
cherokee_spawner_free (void)
{
CHEROKEE_MUTEX_DESTROY (&spawning_mutex);
#ifdef HAVE_POSIX_SHM
cherokee_shm_mrproper (&cherokee_spawn_shared);
#endif
return ret_ok;
}
#ifdef HAVE_POSIX_SHM
static ret_t
write_logger (cherokee_buffer_t *buf,
cherokee_logger_writer_t *error_writer)
{
int val;
/* No writer
*/
if (error_writer == NULL) {
goto nothing;
}
switch (error_writer->type) {
case cherokee_logger_writer_stderr:
val = 6;
cherokee_buffer_add (buf, (char *)&val, sizeof(int));
cherokee_buffer_add_str (buf, "stderr");
cherokee_buffer_add_char (buf, '\0');
break;
case cherokee_logger_writer_file:
val = 5 + error_writer->filename.len;
cherokee_buffer_add (buf, (char *)&val, sizeof(int));
cherokee_buffer_add_str (buf, "file,");
cherokee_buffer_add_buffer (buf, &error_writer->filename);
cherokee_buffer_add_char (buf, '\0');
break;
default:
goto nothing;
}
return ret_ok;
nothing:
val = 0;
cherokee_buffer_add (buf, (char *)&val, sizeof(int));
return ret_ok;
}
#endif
static ret_t
do_sem_op (int sem_ref, int sem_num, int sem_op)
{
int re;
struct sembuf so;
do {
so.sem_num = sem_num;
so.sem_op = sem_op;
so.sem_flg = SEM_UNDO;
errno = 0;
re = semop (sem_ref, &so, 1);
if (re >= 0) {
return ret_ok;
}
} while ((re < 0) && (errno == EINTR));
LOG_ERRNO (errno, cherokee_err_error, CHEROKEE_ERROR_SPAWNER_UNLOCK_SEMAPHORE, sem_ref);
return ret_error;
}
static ret_t
sem_unlock (int sem_ref, int sem_num)
{
return do_sem_op (sem_ref, sem_num, 1);
}
static ret_t
sem_adquire (int sem_ref, int sem_num)
{
return do_sem_op (sem_ref, sem_num, -1);
}
ret_t
cherokee_spawner_spawn (cherokee_buffer_t *binary,
cherokee_buffer_t *user,
uid_t uid,
gid_t gid,
int env_inherited,
char **envp,
cherokee_logger_writer_t *error_writer,
pid_t *pid_ret)
{
#ifdef HAVE_POSIX_SHM
char **n;
int *pid_shm;
int pid_prev;
int k;
int phase;
int envs = 0;
cherokee_buffer_t tmp = CHEROKEE_BUF_INIT;
#define ALIGN4(buf) \
while (buf.len & 0x3) { \
cherokee_buffer_add_char (&buf, '\0'); \
}
/* Check it's initialized
*/
if ((! _active) ||
(cherokee_spawn_shared.mem == NULL))
{
TRACE (ENTRIES, "Spawner is not active. Returning: %s\n", binary->buf);
return ret_deny;
}
/* Lock the monitor mutex
*/
k = CHEROKEE_MUTEX_TRY_LOCK (&spawning_mutex);
if (k) {
return ret_eagain;
}
/* Build the string
* The first character of each block is a mark.
*/
cherokee_buffer_ensure_size (&tmp, SPAWN_SHARED_LEN);
/* 1.- Executable */
phase = 0xF0;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
cherokee_buffer_add (&tmp, (char *)&binary->len, sizeof(int));
cherokee_buffer_add_buffer (&tmp, binary);
cherokee_buffer_add_char (&tmp, '\0');
ALIGN4 (tmp);
/* 2.- UID & GID */
phase = 0xF1;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
cherokee_buffer_add (&tmp, (char *)&user->len, sizeof(int));
cherokee_buffer_add_buffer (&tmp, user);
cherokee_buffer_add_char (&tmp, '\0');
ALIGN4(tmp);
cherokee_buffer_add (&tmp, (char *)&uid, sizeof(uid_t));
cherokee_buffer_add (&tmp, (char *)&gid, sizeof(gid_t));
/* 3.- Environment */
phase = 0xF2;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
for (n=envp; *n; n++) {
envs ++;
}
cherokee_buffer_add (&tmp, (char *)&env_inherited, sizeof(int));
cherokee_buffer_add (&tmp, (char *)&envs, sizeof(int));
for (n=envp; *n; n++) {
int len = strlen(*n);
cherokee_buffer_add (&tmp, (char *)&len, sizeof(int));
cherokee_buffer_add (&tmp, *n, len);
cherokee_buffer_add_char (&tmp, '\0');
ALIGN4(tmp);
}
/* 4.- Error log */
phase = 0xF3;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
write_logger (&tmp, error_writer);
ALIGN4 (tmp);
/* 5.- PID (will be rewritten by the other side) */
phase = 0xF4;
cherokee_buffer_add (&tmp, (char *)&phase, sizeof(int));
pid_shm = (int *) (((char *)cherokee_spawn_shared.mem) + tmp.len);
k = *pid_ret;
pid_prev = *pid_ret;
cherokee_buffer_add (&tmp, (char *)&k, sizeof(int));
/* Copy it to the shared memory
*/
if (unlikely (tmp.len > SPAWN_SHARED_LEN)) {
goto error;
}
memcpy (cherokee_spawn_shared.mem, tmp.buf, tmp.len);
cherokee_buffer_mrproper (&tmp);
/* Wake up the spawning thread
*/
sem_unlock (cherokee_spawn_sem, SEM_LAUNCH_START);
/* Wait for the PID
*/
sem_adquire (cherokee_spawn_sem, SEM_LAUNCH_READY);
if (*pid_shm == -1) {
TRACE(ENTRIES, "Could not get the PID of: '%s'\n", binary->buf);
goto error;
}
if (*pid_shm == pid_prev) {
TRACE(ENTRIES, "Could not the new PID, previously it was %d\n", pid_prev);
goto error;
}
TRACE(ENTRIES, "Successfully launched PID=%d\n", *pid_shm);
*pid_ret = *pid_shm;
CHEROKEE_MUTEX_UNLOCK (&spawning_mutex);
return ret_ok;
error:
CHEROKEE_MUTEX_UNLOCK (&spawning_mutex);
return ret_error;
#else
return ret_not_found;
#endif
}
Jump to Line
Something went wrong with that request. Please try again.