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712 lines
22 KiB
C
712 lines
22 KiB
C
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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr_arch_threadproc.h"
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#include "apr_strings.h"
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#include "apr_portable.h"
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#include "apr_signal.h"
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#include "apr_random.h"
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/* Heavy on no'ops, here's what we want to pass if there is APR_NO_FILE
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* requested for a specific child handle;
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*/
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static apr_file_t no_file = { NULL, -1, };
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APR_DECLARE(apr_status_t) apr_procattr_create(apr_procattr_t **new,
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apr_pool_t *pool)
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{
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(*new) = (apr_procattr_t *)apr_pcalloc(pool, sizeof(apr_procattr_t));
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if ((*new) == NULL) {
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return APR_ENOMEM;
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}
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(*new)->pool = pool;
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(*new)->cmdtype = APR_PROGRAM;
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(*new)->uid = (*new)->gid = -1;
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_io_set(apr_procattr_t *attr,
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apr_int32_t in,
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apr_int32_t out,
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apr_int32_t err)
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{
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apr_status_t rv;
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if ((in != APR_NO_PIPE) && (in != APR_NO_FILE)) {
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/* APR_CHILD_BLOCK maps to APR_WRITE_BLOCK, while
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* APR_PARENT_BLOCK maps to APR_READ_BLOCK, so transpose
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* the CHILD/PARENT blocking flags for the stdin pipe.
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* stdout/stderr map to the correct mode by default.
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*/
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if (in == APR_CHILD_BLOCK)
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in = APR_READ_BLOCK;
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else if (in == APR_PARENT_BLOCK)
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in = APR_WRITE_BLOCK;
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if ((rv = apr_file_pipe_create_ex(&attr->child_in, &attr->parent_in,
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in, attr->pool)) == APR_SUCCESS)
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rv = apr_file_inherit_unset(attr->parent_in);
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if (rv != APR_SUCCESS)
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return rv;
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}
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else if (in == APR_NO_FILE)
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attr->child_in = &no_file;
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if ((out != APR_NO_PIPE) && (out != APR_NO_FILE)) {
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if ((rv = apr_file_pipe_create_ex(&attr->parent_out, &attr->child_out,
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out, attr->pool)) == APR_SUCCESS)
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rv = apr_file_inherit_unset(attr->parent_out);
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if (rv != APR_SUCCESS)
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return rv;
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}
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else if (out == APR_NO_FILE)
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attr->child_out = &no_file;
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if ((err != APR_NO_PIPE) && (err != APR_NO_FILE)) {
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if ((rv = apr_file_pipe_create_ex(&attr->parent_err, &attr->child_err,
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err, attr->pool)) == APR_SUCCESS)
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rv = apr_file_inherit_unset(attr->parent_err);
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if (rv != APR_SUCCESS)
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return rv;
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}
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else if (err == APR_NO_FILE)
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attr->child_err = &no_file;
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_child_in_set(apr_procattr_t *attr,
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apr_file_t *child_in,
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apr_file_t *parent_in)
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{
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apr_status_t rv = APR_SUCCESS;
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if (attr->child_in == NULL && attr->parent_in == NULL
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&& child_in == NULL && parent_in == NULL)
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if ((rv = apr_file_pipe_create(&attr->child_in, &attr->parent_in,
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attr->pool)) == APR_SUCCESS)
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rv = apr_file_inherit_unset(attr->parent_in);
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if (child_in != NULL && rv == APR_SUCCESS) {
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if (attr->child_in && (attr->child_in->filedes != -1))
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rv = apr_file_dup2(attr->child_in, child_in, attr->pool);
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else {
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attr->child_in = NULL;
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if ((rv = apr_file_dup(&attr->child_in, child_in, attr->pool))
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== APR_SUCCESS)
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rv = apr_file_inherit_set(attr->child_in);
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}
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}
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if (parent_in != NULL && rv == APR_SUCCESS) {
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if (attr->parent_in)
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rv = apr_file_dup2(attr->parent_in, parent_in, attr->pool);
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else
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rv = apr_file_dup(&attr->parent_in, parent_in, attr->pool);
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}
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return rv;
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}
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APR_DECLARE(apr_status_t) apr_procattr_child_out_set(apr_procattr_t *attr,
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apr_file_t *child_out,
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apr_file_t *parent_out)
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{
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apr_status_t rv = APR_SUCCESS;
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if (attr->child_out == NULL && attr->parent_out == NULL
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&& child_out == NULL && parent_out == NULL)
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if ((rv = apr_file_pipe_create(&attr->parent_out, &attr->child_out,
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attr->pool)) == APR_SUCCESS)
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rv = apr_file_inherit_unset(attr->parent_out);
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if (child_out != NULL && rv == APR_SUCCESS) {
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if (attr->child_out && (attr->child_out->filedes != -1))
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rv = apr_file_dup2(attr->child_out, child_out, attr->pool);
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else {
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attr->child_out = NULL;
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if ((rv = apr_file_dup(&attr->child_out, child_out, attr->pool))
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== APR_SUCCESS)
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rv = apr_file_inherit_set(attr->child_out);
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}
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}
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if (parent_out != NULL && rv == APR_SUCCESS) {
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if (attr->parent_out)
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rv = apr_file_dup2(attr->parent_out, parent_out, attr->pool);
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else
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rv = apr_file_dup(&attr->parent_out, parent_out, attr->pool);
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}
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return rv;
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}
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APR_DECLARE(apr_status_t) apr_procattr_child_err_set(apr_procattr_t *attr,
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apr_file_t *child_err,
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apr_file_t *parent_err)
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{
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apr_status_t rv = APR_SUCCESS;
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if (attr->child_err == NULL && attr->parent_err == NULL
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&& child_err == NULL && parent_err == NULL)
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if ((rv = apr_file_pipe_create(&attr->parent_err, &attr->child_err,
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attr->pool)) == APR_SUCCESS)
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rv = apr_file_inherit_unset(attr->parent_err);
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if (child_err != NULL && rv == APR_SUCCESS) {
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if (attr->child_err && (attr->child_err->filedes != -1))
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rv = apr_file_dup2(attr->child_err, child_err, attr->pool);
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else {
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attr->child_err = NULL;
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if ((rv = apr_file_dup(&attr->child_err, child_err, attr->pool))
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== APR_SUCCESS)
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rv = apr_file_inherit_set(attr->child_err);
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}
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}
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if (parent_err != NULL && rv == APR_SUCCESS) {
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if (attr->parent_err)
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rv = apr_file_dup2(attr->parent_err, parent_err, attr->pool);
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else
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rv = apr_file_dup(&attr->parent_err, parent_err, attr->pool);
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}
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return rv;
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}
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APR_DECLARE(apr_status_t) apr_procattr_dir_set(apr_procattr_t *attr,
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const char *dir)
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{
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attr->currdir = apr_pstrdup(attr->pool, dir);
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if (attr->currdir) {
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return APR_SUCCESS;
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}
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return APR_ENOMEM;
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}
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APR_DECLARE(apr_status_t) apr_procattr_cmdtype_set(apr_procattr_t *attr,
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apr_cmdtype_e cmd)
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{
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attr->cmdtype = cmd;
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_detach_set(apr_procattr_t *attr,
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apr_int32_t detach)
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{
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attr->detached = detach;
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_proc_fork(apr_proc_t *proc, apr_pool_t *pool)
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{
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int pid;
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memset(proc, 0, sizeof(apr_proc_t));
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if ((pid = fork()) < 0) {
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return errno;
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}
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else if (pid == 0) {
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proc->pid = getpid();
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apr_random_after_fork(proc);
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return APR_INCHILD;
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}
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proc->pid = pid;
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return APR_INPARENT;
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}
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static apr_status_t limit_proc(apr_procattr_t *attr)
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{
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#if APR_HAVE_STRUCT_RLIMIT && APR_HAVE_SETRLIMIT
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#ifdef RLIMIT_CPU
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if (attr->limit_cpu != NULL) {
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if ((setrlimit(RLIMIT_CPU, attr->limit_cpu)) != 0) {
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return errno;
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}
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}
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#endif
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#ifdef RLIMIT_NPROC
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if (attr->limit_nproc != NULL) {
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if ((setrlimit(RLIMIT_NPROC, attr->limit_nproc)) != 0) {
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return errno;
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}
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}
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#endif
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#ifdef RLIMIT_NOFILE
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if (attr->limit_nofile != NULL) {
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if ((setrlimit(RLIMIT_NOFILE, attr->limit_nofile)) != 0) {
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return errno;
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}
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}
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#endif
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#if defined(RLIMIT_AS)
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if (attr->limit_mem != NULL) {
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if ((setrlimit(RLIMIT_AS, attr->limit_mem)) != 0) {
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return errno;
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}
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}
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#elif defined(RLIMIT_DATA)
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if (attr->limit_mem != NULL) {
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if ((setrlimit(RLIMIT_DATA, attr->limit_mem)) != 0) {
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return errno;
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}
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}
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#elif defined(RLIMIT_VMEM)
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if (attr->limit_mem != NULL) {
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if ((setrlimit(RLIMIT_VMEM, attr->limit_mem)) != 0) {
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return errno;
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}
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}
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#endif
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#else
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/*
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* Maybe make a note in error_log that setrlimit isn't supported??
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*/
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#endif
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_child_errfn_set(apr_procattr_t *attr,
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apr_child_errfn_t *errfn)
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{
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attr->errfn = errfn;
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_error_check_set(apr_procattr_t *attr,
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apr_int32_t chk)
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{
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attr->errchk = chk;
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_addrspace_set(apr_procattr_t *attr,
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apr_int32_t addrspace)
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{
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/* won't ever be used on this platform, so don't save the flag */
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_user_set(apr_procattr_t *attr,
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const char *username,
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const char *password)
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{
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apr_status_t rv;
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apr_gid_t gid;
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if ((rv = apr_uid_get(&attr->uid, &gid, username,
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attr->pool)) != APR_SUCCESS) {
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attr->uid = -1;
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return rv;
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}
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/* Use default user group if not already set */
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if (attr->gid == -1) {
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attr->gid = gid;
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}
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return APR_SUCCESS;
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}
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APR_DECLARE(apr_status_t) apr_procattr_group_set(apr_procattr_t *attr,
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const char *groupname)
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{
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apr_status_t rv;
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if ((rv = apr_gid_get(&attr->gid, groupname, attr->pool)) != APR_SUCCESS)
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attr->gid = -1;
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return rv;
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}
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APR_DECLARE(apr_status_t) apr_proc_create(apr_proc_t *new,
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const char *progname,
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const char * const *args,
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const char * const *env,
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apr_procattr_t *attr,
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apr_pool_t *pool)
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{
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int i;
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const char * const empty_envp[] = {NULL};
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if (!env) { /* Specs require an empty array instead of NULL;
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* Purify will trigger a failure, even if many
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* implementations don't.
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*/
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env = empty_envp;
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}
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new->in = attr->parent_in;
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new->err = attr->parent_err;
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new->out = attr->parent_out;
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if (attr->errchk) {
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if (attr->currdir) {
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if (access(attr->currdir, X_OK) == -1) {
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/* chdir() in child wouldn't have worked */
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return errno;
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}
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}
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if (attr->cmdtype == APR_PROGRAM ||
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attr->cmdtype == APR_PROGRAM_ENV ||
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*progname == '/') {
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/* for both of these values of cmdtype, caller must pass
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* full path, so it is easy to check;
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* caller can choose to pass full path for other
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* values of cmdtype
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*/
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if (access(progname, X_OK) == -1) {
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/* exec*() in child wouldn't have worked */
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return errno;
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}
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}
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else {
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/* todo: search PATH for progname then try to access it */
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}
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}
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if ((new->pid = fork()) < 0) {
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return errno;
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}
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else if (new->pid == 0) {
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/* child process */
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/*
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* If we do exec cleanup before the dup2() calls to set up pipes
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* on 0-2, we accidentally close the pipes used by programs like
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* mod_cgid.
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*
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* If we do exec cleanup after the dup2() calls, cleanup can accidentally
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* close our pipes which replaced any files which previously had
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* descriptors 0-2.
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*
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* The solution is to kill the cleanup for the pipes, then do
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* exec cleanup, then do the dup2() calls.
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*/
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if (attr->child_in) {
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apr_pool_cleanup_kill(apr_file_pool_get(attr->child_in),
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attr->child_in, apr_unix_file_cleanup);
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}
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if (attr->child_out) {
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apr_pool_cleanup_kill(apr_file_pool_get(attr->child_out),
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attr->child_out, apr_unix_file_cleanup);
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}
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||
|
if (attr->child_err) {
|
||
|
apr_pool_cleanup_kill(apr_file_pool_get(attr->child_err),
|
||
|
attr->child_err, apr_unix_file_cleanup);
|
||
|
}
|
||
|
|
||
|
apr_pool_cleanup_for_exec();
|
||
|
|
||
|
if ((attr->child_in) && (attr->child_in->filedes == -1)) {
|
||
|
close(STDIN_FILENO);
|
||
|
}
|
||
|
else if (attr->child_in &&
|
||
|
attr->child_in->filedes != STDIN_FILENO) {
|
||
|
dup2(attr->child_in->filedes, STDIN_FILENO);
|
||
|
apr_file_close(attr->child_in);
|
||
|
}
|
||
|
|
||
|
if ((attr->child_out) && (attr->child_out->filedes == -1)) {
|
||
|
close(STDOUT_FILENO);
|
||
|
}
|
||
|
else if (attr->child_out &&
|
||
|
attr->child_out->filedes != STDOUT_FILENO) {
|
||
|
dup2(attr->child_out->filedes, STDOUT_FILENO);
|
||
|
apr_file_close(attr->child_out);
|
||
|
}
|
||
|
|
||
|
if ((attr->child_err) && (attr->child_err->filedes == -1)) {
|
||
|
close(STDERR_FILENO);
|
||
|
}
|
||
|
else if (attr->child_err &&
|
||
|
attr->child_err->filedes != STDERR_FILENO) {
|
||
|
dup2(attr->child_err->filedes, STDERR_FILENO);
|
||
|
apr_file_close(attr->child_err);
|
||
|
}
|
||
|
|
||
|
apr_signal(SIGCHLD, SIG_DFL); /* not sure if this is needed or not */
|
||
|
|
||
|
if (attr->currdir != NULL) {
|
||
|
if (chdir(attr->currdir) == -1) {
|
||
|
if (attr->errfn) {
|
||
|
attr->errfn(pool, errno, "change of working directory failed");
|
||
|
}
|
||
|
_exit(-1); /* We have big problems, the child should exit. */
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Only try to switch if we are running as root */
|
||
|
if (attr->gid != -1 && !geteuid()) {
|
||
|
if (setgid(attr->gid)) {
|
||
|
if (attr->errfn) {
|
||
|
attr->errfn(pool, errno, "setting of group failed");
|
||
|
}
|
||
|
_exit(-1); /* We have big problems, the child should exit. */
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (attr->uid != -1 && !geteuid()) {
|
||
|
if (setuid(attr->uid)) {
|
||
|
if (attr->errfn) {
|
||
|
attr->errfn(pool, errno, "setting of user failed");
|
||
|
}
|
||
|
_exit(-1); /* We have big problems, the child should exit. */
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (limit_proc(attr) != APR_SUCCESS) {
|
||
|
if (attr->errfn) {
|
||
|
attr->errfn(pool, errno, "setting of resource limits failed");
|
||
|
}
|
||
|
_exit(-1); /* We have big problems, the child should exit. */
|
||
|
}
|
||
|
|
||
|
if (attr->cmdtype == APR_SHELLCMD ||
|
||
|
attr->cmdtype == APR_SHELLCMD_ENV) {
|
||
|
int onearg_len = 0;
|
||
|
const char *newargs[4];
|
||
|
|
||
|
newargs[0] = SHELL_PATH;
|
||
|
newargs[1] = "-c";
|
||
|
|
||
|
i = 0;
|
||
|
while (args[i]) {
|
||
|
onearg_len += strlen(args[i]);
|
||
|
onearg_len++; /* for space delimiter */
|
||
|
i++;
|
||
|
}
|
||
|
|
||
|
switch(i) {
|
||
|
case 0:
|
||
|
/* bad parameters; we're doomed */
|
||
|
break;
|
||
|
case 1:
|
||
|
/* no args, or caller already built a single string from
|
||
|
* progname and args
|
||
|
*/
|
||
|
newargs[2] = args[0];
|
||
|
break;
|
||
|
default:
|
||
|
{
|
||
|
char *ch, *onearg;
|
||
|
|
||
|
ch = onearg = apr_palloc(pool, onearg_len);
|
||
|
i = 0;
|
||
|
while (args[i]) {
|
||
|
size_t len = strlen(args[i]);
|
||
|
|
||
|
memcpy(ch, args[i], len);
|
||
|
ch += len;
|
||
|
*ch = ' ';
|
||
|
++ch;
|
||
|
++i;
|
||
|
}
|
||
|
--ch; /* back up to trailing blank */
|
||
|
*ch = '\0';
|
||
|
newargs[2] = onearg;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
newargs[3] = NULL;
|
||
|
|
||
|
if (attr->detached) {
|
||
|
apr_proc_detach(APR_PROC_DETACH_DAEMONIZE);
|
||
|
}
|
||
|
|
||
|
if (attr->cmdtype == APR_SHELLCMD) {
|
||
|
execve(SHELL_PATH, (char * const *) newargs, (char * const *)env);
|
||
|
}
|
||
|
else {
|
||
|
execv(SHELL_PATH, (char * const *)newargs);
|
||
|
}
|
||
|
}
|
||
|
else if (attr->cmdtype == APR_PROGRAM) {
|
||
|
if (attr->detached) {
|
||
|
apr_proc_detach(APR_PROC_DETACH_DAEMONIZE);
|
||
|
}
|
||
|
|
||
|
execve(progname, (char * const *)args, (char * const *)env);
|
||
|
}
|
||
|
else if (attr->cmdtype == APR_PROGRAM_ENV) {
|
||
|
if (attr->detached) {
|
||
|
apr_proc_detach(APR_PROC_DETACH_DAEMONIZE);
|
||
|
}
|
||
|
|
||
|
execv(progname, (char * const *)args);
|
||
|
}
|
||
|
else {
|
||
|
/* APR_PROGRAM_PATH */
|
||
|
if (attr->detached) {
|
||
|
apr_proc_detach(APR_PROC_DETACH_DAEMONIZE);
|
||
|
}
|
||
|
|
||
|
execvp(progname, (char * const *)args);
|
||
|
}
|
||
|
if (attr->errfn) {
|
||
|
char *desc;
|
||
|
|
||
|
desc = apr_psprintf(pool, "exec of '%s' failed",
|
||
|
progname);
|
||
|
attr->errfn(pool, errno, desc);
|
||
|
}
|
||
|
|
||
|
_exit(-1); /* if we get here, there is a problem, so exit with an
|
||
|
* error code. */
|
||
|
}
|
||
|
|
||
|
/* Parent process */
|
||
|
if (attr->child_in && (attr->child_in->filedes != -1)) {
|
||
|
apr_file_close(attr->child_in);
|
||
|
}
|
||
|
|
||
|
if (attr->child_out && (attr->child_out->filedes != -1)) {
|
||
|
apr_file_close(attr->child_out);
|
||
|
}
|
||
|
|
||
|
if (attr->child_err && (attr->child_err->filedes != -1)) {
|
||
|
apr_file_close(attr->child_err);
|
||
|
}
|
||
|
|
||
|
return APR_SUCCESS;
|
||
|
}
|
||
|
|
||
|
APR_DECLARE(apr_status_t) apr_proc_wait_all_procs(apr_proc_t *proc,
|
||
|
int *exitcode,
|
||
|
apr_exit_why_e *exitwhy,
|
||
|
apr_wait_how_e waithow,
|
||
|
apr_pool_t *p)
|
||
|
{
|
||
|
proc->pid = -1;
|
||
|
return apr_proc_wait(proc, exitcode, exitwhy, waithow);
|
||
|
}
|
||
|
|
||
|
APR_DECLARE(apr_status_t) apr_proc_wait(apr_proc_t *proc,
|
||
|
int *exitcode, apr_exit_why_e *exitwhy,
|
||
|
apr_wait_how_e waithow)
|
||
|
{
|
||
|
pid_t pstatus;
|
||
|
int waitpid_options = WUNTRACED;
|
||
|
int exit_int;
|
||
|
int ignore;
|
||
|
apr_exit_why_e ignorewhy;
|
||
|
|
||
|
if (exitcode == NULL) {
|
||
|
exitcode = &ignore;
|
||
|
}
|
||
|
|
||
|
if (exitwhy == NULL) {
|
||
|
exitwhy = &ignorewhy;
|
||
|
}
|
||
|
|
||
|
if (waithow != APR_WAIT) {
|
||
|
waitpid_options |= WNOHANG;
|
||
|
}
|
||
|
|
||
|
do {
|
||
|
pstatus = waitpid(proc->pid, &exit_int, waitpid_options);
|
||
|
} while (pstatus < 0 && errno == EINTR);
|
||
|
|
||
|
if (pstatus > 0) {
|
||
|
proc->pid = pstatus;
|
||
|
|
||
|
if (WIFEXITED(exit_int)) {
|
||
|
*exitwhy = APR_PROC_EXIT;
|
||
|
*exitcode = WEXITSTATUS(exit_int);
|
||
|
}
|
||
|
else if (WIFSIGNALED(exit_int)) {
|
||
|
*exitwhy = APR_PROC_SIGNAL;
|
||
|
|
||
|
#ifdef WCOREDUMP
|
||
|
if (WCOREDUMP(exit_int)) {
|
||
|
*exitwhy |= APR_PROC_SIGNAL_CORE;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
*exitcode = WTERMSIG(exit_int);
|
||
|
}
|
||
|
else {
|
||
|
/* unexpected condition */
|
||
|
return APR_EGENERAL;
|
||
|
}
|
||
|
|
||
|
return APR_CHILD_DONE;
|
||
|
}
|
||
|
else if (pstatus == 0) {
|
||
|
return APR_CHILD_NOTDONE;
|
||
|
}
|
||
|
|
||
|
return errno;
|
||
|
}
|
||
|
|
||
|
#if APR_HAVE_STRUCT_RLIMIT
|
||
|
APR_DECLARE(apr_status_t) apr_procattr_limit_set(apr_procattr_t *attr,
|
||
|
apr_int32_t what,
|
||
|
struct rlimit *limit)
|
||
|
{
|
||
|
switch(what) {
|
||
|
case APR_LIMIT_CPU:
|
||
|
#ifdef RLIMIT_CPU
|
||
|
attr->limit_cpu = limit;
|
||
|
break;
|
||
|
#else
|
||
|
return APR_ENOTIMPL;
|
||
|
#endif
|
||
|
|
||
|
case APR_LIMIT_MEM:
|
||
|
#if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)
|
||
|
attr->limit_mem = limit;
|
||
|
break;
|
||
|
#else
|
||
|
return APR_ENOTIMPL;
|
||
|
#endif
|
||
|
|
||
|
case APR_LIMIT_NPROC:
|
||
|
#ifdef RLIMIT_NPROC
|
||
|
attr->limit_nproc = limit;
|
||
|
break;
|
||
|
#else
|
||
|
return APR_ENOTIMPL;
|
||
|
#endif
|
||
|
|
||
|
case APR_LIMIT_NOFILE:
|
||
|
#ifdef RLIMIT_NOFILE
|
||
|
attr->limit_nofile = limit;
|
||
|
break;
|
||
|
#else
|
||
|
return APR_ENOTIMPL;
|
||
|
#endif
|
||
|
|
||
|
}
|
||
|
|
||
|
return APR_SUCCESS;
|
||
|
}
|
||
|
#endif /* APR_HAVE_STRUCT_RLIMIT */
|
||
|
|