proc.c

Apache官方在今天放出产品系列2.2的最新版本2.2.11的源码包 最流行的HTTP服务器软件之一

/* 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_arch_threadproc.h"
#include "apr_strings.h"
#include "apr_portable.h"
#include "apr_signal.h"
#include "apr_random.h"

/* Heavy on no'ops, here's what we want to pass if there is APR_NO_FILE
 * requested for a specific child handle;
 */
static apr_file_t no_file = { NULL, -1, };

APR_DECLARE(apr_status_t) apr_procattr_create(apr_procattr_t **new,
                                              apr_pool_t *pool)
{
    (*new) = (apr_procattr_t *)apr_pcalloc(pool, sizeof(apr_procattr_t));

    if ((*new) == NULL) {
        return APR_ENOMEM;
    }
    (*new)->pool = pool;
    (*new)->cmdtype = APR_PROGRAM;
    (*new)->uid = (*new)->gid = -1;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_io_set(apr_procattr_t *attr,
                                              apr_int32_t in,
                                              apr_int32_t out,
                                              apr_int32_t err)
{
    apr_status_t rv;

    if ((in != APR_NO_PIPE) && (in != APR_NO_FILE)) {
        /* APR_CHILD_BLOCK maps to APR_WRITE_BLOCK, while
         * APR_PARENT_BLOCK maps to APR_READ_BLOCK, so transpose 
         * the CHILD/PARENT blocking flags for the stdin pipe.
         * stdout/stderr map to the correct mode by default.
         */
        if (in == APR_CHILD_BLOCK)
            in = APR_READ_BLOCK;
        else if (in == APR_PARENT_BLOCK)
            in = APR_WRITE_BLOCK;

        if ((rv = apr_file_pipe_create_ex(&attr->child_in, &attr->parent_in,
                                          in, attr->pool)) == APR_SUCCESS)
            rv = apr_file_inherit_unset(attr->parent_in);
        if (rv != APR_SUCCESS)
            return rv;
    }
    else if (in == APR_NO_FILE)
        attr->child_in = &no_file;

    if ((out != APR_NO_PIPE) && (out != APR_NO_FILE)) {
        if ((rv = apr_file_pipe_create_ex(&attr->parent_out, &attr->child_out,
                                          out, attr->pool)) == APR_SUCCESS)
            rv = apr_file_inherit_unset(attr->parent_out);
        if (rv != APR_SUCCESS)
            return rv;
    }
    else if (out == APR_NO_FILE)
        attr->child_out = &no_file;

    if ((err != APR_NO_PIPE) && (err != APR_NO_FILE)) {
        if ((rv = apr_file_pipe_create_ex(&attr->parent_err, &attr->child_err,
                                          err, attr->pool)) != APR_SUCCESS)
            rv = apr_file_inherit_unset(attr->parent_err);
        if (rv != APR_SUCCESS)
            return rv;
    }
    else if (err == APR_NO_FILE)
        attr->child_err = &no_file;

    return APR_SUCCESS;
}


APR_DECLARE(apr_status_t) apr_procattr_child_in_set(apr_procattr_t *attr,
                                                    apr_file_t *child_in,
                                                    apr_file_t *parent_in)
{
    apr_status_t rv = APR_SUCCESS;

    if (attr->child_in == NULL && attr->parent_in == NULL
           && child_in == NULL && parent_in == NULL)
        if ((rv = apr_file_pipe_create(&attr->child_in, &attr->parent_in,
                                       attr->pool)) == APR_SUCCESS)
            rv = apr_file_inherit_unset(attr->parent_in);

    if (child_in != NULL && rv == APR_SUCCESS) {
        if (attr->child_in && (attr->child_in->filedes != -1))
            rv = apr_file_dup2(attr->child_in, child_in, attr->pool);
        else {
            attr->child_in = NULL;
            if ((rv = apr_file_dup(&attr->child_in, child_in, attr->pool))
                    == APR_SUCCESS)
                rv = apr_file_inherit_set(attr->child_in);
        }
    }

    if (parent_in != NULL && rv == APR_SUCCESS) {
        if (attr->parent_in)
            rv = apr_file_dup2(attr->parent_in, parent_in, attr->pool);
        else
            rv = apr_file_dup(&attr->parent_in, parent_in, attr->pool);
    }

    return rv;
}


APR_DECLARE(apr_status_t) apr_procattr_child_out_set(apr_procattr_t *attr,
                                                     apr_file_t *child_out,
                                                     apr_file_t *parent_out)
{
    apr_status_t rv = APR_SUCCESS;

    if (attr->child_out == NULL && attr->parent_out == NULL
           && child_out == NULL && parent_out == NULL)
        if ((rv = apr_file_pipe_create(&attr->parent_out, &attr->child_out,
                                       attr->pool)) == APR_SUCCESS)
            rv = apr_file_inherit_unset(attr->parent_out);

    if (child_out != NULL && rv == APR_SUCCESS) {
        if (attr->child_out && (attr->child_out->filedes != -1))
            rv = apr_file_dup2(attr->child_out, child_out, attr->pool);
        else {
            attr->child_out = NULL;
            if ((rv = apr_file_dup(&attr->child_out, child_out, attr->pool))
                    == APR_SUCCESS)
                rv = apr_file_inherit_set(attr->child_out);
        }
    }

    if (parent_out != NULL && rv == APR_SUCCESS) {
        if (attr->parent_out)
            rv = apr_file_dup2(attr->parent_out, parent_out, attr->pool);
        else
            rv = apr_file_dup(&attr->parent_out, parent_out, attr->pool);
    }

    return rv;
}


APR_DECLARE(apr_status_t) apr_procattr_child_err_set(apr_procattr_t *attr,
                                                     apr_file_t *child_err,
                                                     apr_file_t *parent_err)
{
    apr_status_t rv = APR_SUCCESS;

    if (attr->child_err == NULL && attr->parent_err == NULL
           && child_err == NULL && parent_err == NULL)
        if ((rv = apr_file_pipe_create(&attr->parent_err, &attr->child_err,
                                      attr->pool)) == APR_SUCCESS)
            rv = apr_file_inherit_unset(attr->parent_err);

    if (child_err != NULL && rv == APR_SUCCESS) {
        if (attr->child_err && (attr->child_err->filedes != -1))
            rv = apr_file_dup2(attr->child_err, child_err, attr->pool);
        else {
            attr->child_err = NULL;
            if ((rv = apr_file_dup(&attr->child_err, child_err, attr->pool))
                    == APR_SUCCESS)
                rv = apr_file_inherit_set(attr->child_err);
        }
    }
    if (parent_err != NULL && rv == APR_SUCCESS) {
        if (attr->parent_err)
            rv = apr_file_dup2(attr->parent_err, parent_err, attr->pool);
        else
            rv = apr_file_dup(&attr->parent_err, parent_err, attr->pool);
    }

    return rv;
}


APR_DECLARE(apr_status_t) apr_procattr_dir_set(apr_procattr_t *attr,
                                               const char *dir)
{
    attr->currdir = apr_pstrdup(attr->pool, dir);
    if (attr->currdir) {
        return APR_SUCCESS;
    }

    return APR_ENOMEM;
}

APR_DECLARE(apr_status_t) apr_procattr_cmdtype_set(apr_procattr_t *attr,
                                                   apr_cmdtype_e cmd)
{
    attr->cmdtype = cmd;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_detach_set(apr_procattr_t *attr,
                                                  apr_int32_t detach)
{
    attr->detached = detach;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_proc_fork(apr_proc_t *proc, apr_pool_t *pool)
{
    int pid;

    if ((pid = fork()) < 0) {
        return errno;
    }
    else if (pid == 0) {
        proc->pid = pid;
        proc->in = NULL;
        proc->out = NULL;
        proc->err = NULL;

        apr_random_after_fork(proc);

        return APR_INCHILD;
    }

    proc->pid = pid;
    proc->in = NULL;
    proc->out = NULL;
    proc->err = NULL;

    return APR_INPARENT;
}

static apr_status_t limit_proc(apr_procattr_t *attr)
{
#if APR_HAVE_STRUCT_RLIMIT && APR_HAVE_SETRLIMIT
#ifdef RLIMIT_CPU
    if (attr->limit_cpu != NULL) {
        if ((setrlimit(RLIMIT_CPU, attr->limit_cpu)) != 0) {
            return errno;
        }
    }
#endif
#ifdef RLIMIT_NPROC
    if (attr->limit_nproc != NULL) {
        if ((setrlimit(RLIMIT_NPROC, attr->limit_nproc)) != 0) {
            return errno;
        }
    }
#endif
#ifdef RLIMIT_NOFILE
    if (attr->limit_nofile != NULL) {
        if ((setrlimit(RLIMIT_NOFILE, attr->limit_nofile)) != 0) {
            return errno;
        }
    }
#endif
#if defined(RLIMIT_AS)
    if (attr->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_AS, attr->limit_mem)) != 0) {
            return errno;
        }
    }
#elif defined(RLIMIT_DATA)
    if (attr->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_DATA, attr->limit_mem)) != 0) {
            return errno;
        }
    }
#elif defined(RLIMIT_VMEM)
    if (attr->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_VMEM, attr->limit_mem)) != 0) {
            return errno;
        }
    }
#endif
#else
    /*
     * Maybe make a note in error_log that setrlimit isn't supported??
     */

#endif
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_child_errfn_set(apr_procattr_t *attr,
                                                       apr_child_errfn_t *errfn)
{
    attr->errfn = errfn;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_error_check_set(apr_procattr_t *attr,
                                                       apr_int32_t chk)
{
    attr->errchk = chk;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_addrspace_set(apr_procattr_t *attr,
                                                       apr_int32_t addrspace)
{
    /* won't ever be used on this platform, so don't save the flag */
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_user_set(apr_procattr_t *attr,
                                                const char *username,
                                                const char *password)
{
    apr_status_t rv;
    apr_gid_t    gid;

    if ((rv = apr_uid_get(&attr->uid, &gid, username,
                          attr->pool)) != APR_SUCCESS) {
        attr->uid = -1;
        return rv;
    }
    
    /* Use default user group if not already set */
    if (attr->gid == -1) {
        attr->gid = gid;
    }
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_group_set(apr_procattr_t *attr,
                                                 const char *groupname)
{
    apr_status_t rv;

    if ((rv = apr_gid_get(&attr->gid, groupname, attr->pool)) != APR_SUCCESS)
        attr->gid = -1;
    return rv;
}

APR_DECLARE(apr_status_t) apr_proc_create(apr_proc_t *new,
                                          const char *progname,
                                          const char * const *args,
                                          const char * const *env,
                                          apr_procattr_t *attr,
                                          apr_pool_t *pool)
{
    int i;
    const char * const empty_envp[] = {NULL};