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-rw-r--r--server/util_fcgi.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/server/util_fcgi.c b/server/util_fcgi.c
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+/* 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 "httpd.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "util_fcgi.h"
+
+/* we know core's module_index is 0 */
+#undef APLOG_MODULE_INDEX
+#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX
+
+AP_DECLARE(void) ap_fcgi_header_to_array(ap_fcgi_header *h,
+ unsigned char a[])
+{
+ a[AP_FCGI_HDR_VERSION_OFFSET] = h->version;
+ a[AP_FCGI_HDR_TYPE_OFFSET] = h->type;
+ a[AP_FCGI_HDR_REQUEST_ID_B1_OFFSET] = h->requestIdB1;
+ a[AP_FCGI_HDR_REQUEST_ID_B0_OFFSET] = h->requestIdB0;
+ a[AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET] = h->contentLengthB1;
+ a[AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET] = h->contentLengthB0;
+ a[AP_FCGI_HDR_PADDING_LEN_OFFSET] = h->paddingLength;
+ a[AP_FCGI_HDR_RESERVED_OFFSET] = h->reserved;
+}
+
+AP_DECLARE(void) ap_fcgi_header_from_array(ap_fcgi_header *h,
+ unsigned char a[])
+{
+ h->version = a[AP_FCGI_HDR_VERSION_OFFSET];
+ h->type = a[AP_FCGI_HDR_TYPE_OFFSET];
+ h->requestIdB1 = a[AP_FCGI_HDR_REQUEST_ID_B1_OFFSET];
+ h->requestIdB0 = a[AP_FCGI_HDR_REQUEST_ID_B0_OFFSET];
+ h->contentLengthB1 = a[AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET];
+ h->contentLengthB0 = a[AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET];
+ h->paddingLength = a[AP_FCGI_HDR_PADDING_LEN_OFFSET];
+ h->reserved = a[AP_FCGI_HDR_RESERVED_OFFSET];
+}
+
+AP_DECLARE(void) ap_fcgi_header_fields_from_array(unsigned char *version,
+ unsigned char *type,
+ apr_uint16_t *request_id,
+ apr_uint16_t *content_len,
+ unsigned char *padding_len,
+ unsigned char a[])
+{
+ *version = a[AP_FCGI_HDR_VERSION_OFFSET];
+ *type = a[AP_FCGI_HDR_TYPE_OFFSET];
+ *request_id = (a[AP_FCGI_HDR_REQUEST_ID_B1_OFFSET] << 8)
+ + a[AP_FCGI_HDR_REQUEST_ID_B0_OFFSET];
+ *content_len = (a[AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET] << 8)
+ + a[AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET];
+ *padding_len = a[AP_FCGI_HDR_PADDING_LEN_OFFSET];
+}
+
+AP_DECLARE(void) ap_fcgi_begin_request_body_to_array(ap_fcgi_begin_request_body *h,
+ unsigned char a[])
+{
+ a[AP_FCGI_BRB_ROLEB1_OFFSET] = h->roleB1;
+ a[AP_FCGI_BRB_ROLEB0_OFFSET] = h->roleB0;
+ a[AP_FCGI_BRB_FLAGS_OFFSET] = h->flags;
+ a[AP_FCGI_BRB_RESERVED0_OFFSET] = h->reserved[0];
+ a[AP_FCGI_BRB_RESERVED1_OFFSET] = h->reserved[1];
+ a[AP_FCGI_BRB_RESERVED2_OFFSET] = h->reserved[2];
+ a[AP_FCGI_BRB_RESERVED3_OFFSET] = h->reserved[3];
+ a[AP_FCGI_BRB_RESERVED4_OFFSET] = h->reserved[4];
+}
+
+AP_DECLARE(void) ap_fcgi_fill_in_header(ap_fcgi_header *header,
+ unsigned char type,
+ apr_uint16_t request_id,
+ apr_uint16_t content_len,
+ unsigned char padding_len)
+{
+ header->version = AP_FCGI_VERSION_1;
+
+ header->type = type;
+
+ header->requestIdB1 = ((request_id >> 8) & 0xff);
+ header->requestIdB0 = ((request_id) & 0xff);
+
+ header->contentLengthB1 = ((content_len >> 8) & 0xff);
+ header->contentLengthB0 = ((content_len) & 0xff);
+
+ header->paddingLength = padding_len;
+
+ header->reserved = 0;
+}
+
+AP_DECLARE(void) ap_fcgi_fill_in_request_body(ap_fcgi_begin_request_body *brb,
+ int role,
+ unsigned char flags)
+{
+ brb->roleB1 = ((role >> 8) & 0xff);
+ brb->roleB0 = (role & 0xff);
+ brb->flags = flags;
+ brb->reserved[0] = 0;
+ brb->reserved[1] = 0;
+ brb->reserved[2] = 0;
+ brb->reserved[3] = 0;
+ brb->reserved[4] = 0;
+}
+
+AP_DECLARE(apr_size_t) ap_fcgi_encoded_env_len(apr_table_t *env,
+ apr_size_t maxlen,
+ int *starting_elem)
+{
+ const apr_array_header_t *envarr;
+ const apr_table_entry_t *elts;
+ apr_size_t envlen, actualenvlen;
+ int i;
+
+ if (maxlen > AP_FCGI_MAX_CONTENT_LEN) {
+ maxlen = AP_FCGI_MAX_CONTENT_LEN;
+ }
+
+ envarr = apr_table_elts(env);
+ elts = (const apr_table_entry_t *) envarr->elts;
+
+ /* envlen - speculative, may overflow the limit
+ * actualenvlen - len required without overflowing
+ */
+ envlen = actualenvlen = 0;
+ for (i = *starting_elem; i < envarr->nelts; ) {
+ apr_size_t keylen, vallen;
+
+ if (!elts[i].key) {
+ (*starting_elem)++;
+ i++;
+ continue;
+ }
+
+ keylen = strlen(elts[i].key);
+
+ if (keylen >> 7 == 0) {
+ envlen += 1;
+ }
+ else {
+ envlen += 4;
+ }
+
+ envlen += keylen;
+
+ vallen = elts[i].val ? strlen(elts[i].val) : 0;
+
+ if (vallen >> 7 == 0) {
+ envlen += 1;
+ }
+ else {
+ envlen += 4;
+ }
+
+ envlen += vallen;
+
+ if (envlen > maxlen) {
+ break;
+ }
+
+ actualenvlen = envlen;
+ (*starting_elem)++;
+ i++;
+ }
+
+ return actualenvlen;
+}
+
+AP_DECLARE(apr_status_t) ap_fcgi_encode_env(request_rec *r,
+ apr_table_t *env,
+ void *buffer,
+ apr_size_t buflen,
+ int *starting_elem)
+{
+ apr_status_t rv = APR_SUCCESS;
+ const apr_array_header_t *envarr;
+ const apr_table_entry_t *elts;
+ char *itr;
+ int i;
+
+ envarr = apr_table_elts(env);
+ elts = (const apr_table_entry_t *) envarr->elts;
+
+ itr = buffer;
+
+ for (i = *starting_elem; i < envarr->nelts; ) {
+ apr_size_t keylen, vallen;
+
+ if (!elts[i].key) {
+ (*starting_elem)++;
+ i++;
+ continue;
+ }
+
+ keylen = strlen(elts[i].key);
+
+ if (keylen >> 7 == 0) {
+ if (buflen < 1) {
+ rv = APR_ENOSPC; /* overflow */
+ break;
+ }
+ itr[0] = keylen & 0xff;
+ itr += 1;
+ buflen -= 1;
+ }
+ else {
+ if (buflen < 4) {
+ rv = APR_ENOSPC; /* overflow */
+ break;
+ }
+ itr[0] = ((keylen >> 24) & 0xff) | 0x80;
+ itr[1] = ((keylen >> 16) & 0xff);
+ itr[2] = ((keylen >> 8) & 0xff);
+ itr[3] = ((keylen) & 0xff);
+ itr += 4;
+ buflen -= 4;
+ }
+
+ vallen = elts[i].val ? strlen(elts[i].val) : 0;
+
+ if (vallen >> 7 == 0) {
+ if (buflen < 1) {
+ rv = APR_ENOSPC; /* overflow */
+ break;
+ }
+ itr[0] = vallen & 0xff;
+ itr += 1;
+ buflen -= 1;
+ }
+ else {
+ if (buflen < 4) {
+ rv = APR_ENOSPC; /* overflow */
+ break;
+ }
+ itr[0] = ((vallen >> 24) & 0xff) | 0x80;
+ itr[1] = ((vallen >> 16) & 0xff);
+ itr[2] = ((vallen >> 8) & 0xff);
+ itr[3] = ((vallen) & 0xff);
+ itr += 4;
+ buflen -= 4;
+ }
+
+ if (buflen < keylen) {
+ rv = APR_ENOSPC; /* overflow */
+ break;
+ }
+ memcpy(itr, elts[i].key, keylen);
+ itr += keylen;
+ buflen -= keylen;
+
+ if (buflen < vallen) {
+ rv = APR_ENOSPC; /* overflow */
+ break;
+ }
+
+ if (elts[i].val) {
+ memcpy(itr, elts[i].val, vallen);
+ itr += vallen;
+ }
+
+ if (buflen == vallen) {
+ (*starting_elem)++;
+ i++;
+ break; /* filled up predicted space, as expected */
+ }
+
+ buflen -= vallen;
+
+ (*starting_elem)++;
+ i++;
+ }
+
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02492)
+ "ap_fcgi_encode_env: out of space "
+ "encoding environment");
+ }
+
+ return rv;
+}
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