httpd/server/util_fcgi.c

1a38107941725211e7c3f051f7a8f5e12199f03acmaeder/* Licensed to the Apache Software Foundation (ASF) under one or more
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * contributor license agreements.  See the NOTICE file distributed with
e9458b1a7a19a63aa4c179f9ab20f4d50681c168Jens Elkner * this work for additional information regarding copyright ownership.
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * The ASF licenses this file to You under the Apache License, Version 2.0
431571057e88a650a974adec93ea4bb5173b6213Felix Gabriel Mance * (the "License"); you may not use this file except in compliance with
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * the License.  You may obtain a copy of the License at
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu *
431571057e88a650a974adec93ea4bb5173b6213Felix Gabriel Mance *     http://www.apache.org/licenses/LICENSE-2.0
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu *
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * Unless required by applicable law or agreed to in writing, software
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * distributed under the License is distributed on an "AS IS" BASIS,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * See the License for the specific language governing permissions and
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu * limitations under the License.
19e01e1a7e319063434bd86c8ecbc5f241ef9993Felix Gabriel Mance */
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski#include "httpd.h"
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu#include "http_core.h"
a604cbad8e2202147b5c6bb9f2e06ae61162d654Felix Gabriel Mance#include "http_log.h"
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu#include "util_fcgi.h"
be2439588008221e691321fdf4f75432cfb72878Felix Gabriel Mance
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu/* we know core's module_index is 0 */
fc05327b875b5723b6c17849b83477f29ec12c90Felix Gabriel Mance#undef APLOG_MODULE_INDEX
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae BungiuAP_DECLARE(void) ap_fcgi_header_to_array(ap_fcgi_header *h,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                         unsigned char a[])
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder{
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    a[AP_FCGI_HDR_VERSION_OFFSET]        = h->version;
e0f1794e365dd347e97b37d7d22b2fce27296fa1Christian Maeder    a[AP_FCGI_HDR_TYPE_OFFSET]           = h->type;
424860079d47bf490fa98d5d7498096a0447c569mcodescu    a[AP_FCGI_HDR_REQUEST_ID_B1_OFFSET]  = h->requestIdB1;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    a[AP_FCGI_HDR_REQUEST_ID_B0_OFFSET]  = h->requestIdB0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    a[AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET] = h->contentLengthB1;
1a38107941725211e7c3f051f7a8f5e12199f03acmaeder    a[AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET] = h->contentLengthB0;
1a38107941725211e7c3f051f7a8f5e12199f03acmaeder    a[AP_FCGI_HDR_PADDING_LEN_OFFSET]    = h->paddingLength;
32bbac77828be0233953f8fe476edb0a9585408dChristian Maeder    a[AP_FCGI_HDR_RESERVED_OFFSET]       = h->reserved;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu}
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae BungiuAP_DECLARE(void) ap_fcgi_header_from_array(ap_fcgi_header *h,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                           unsigned char a[])
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu{
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    h->version         = a[AP_FCGI_HDR_VERSION_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    h->type            = a[AP_FCGI_HDR_TYPE_OFFSET];
27fdf879983dd28e211b41f3be6c0e930b7c816bFelix Gabriel Mance    h->requestIdB1     = a[AP_FCGI_HDR_REQUEST_ID_B1_OFFSET];
431571057e88a650a974adec93ea4bb5173b6213Felix Gabriel Mance    h->requestIdB0     = a[AP_FCGI_HDR_REQUEST_ID_B0_OFFSET];
1a38107941725211e7c3f051f7a8f5e12199f03acmaeder    h->contentLengthB1 = a[AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    h->contentLengthB0 = a[AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    h->paddingLength   = a[AP_FCGI_HDR_PADDING_LEN_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    h->reserved        = a[AP_FCGI_HDR_RESERVED_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu}
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
b84c87f199dc287d235d7dad6ea344f6912ef531Christian MaederAP_DECLARE(void) ap_fcgi_header_fields_from_array(unsigned char *version,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                                  unsigned char *type,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                                  apr_uint16_t *request_id,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                                  apr_uint16_t *content_len,
be00381168b3f10192afabbba136fb06d3a9f358Christian Maeder                                                  unsigned char *padding_len,
be00381168b3f10192afabbba136fb06d3a9f358Christian Maeder                                                  unsigned char a[])
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu{
27fdf879983dd28e211b41f3be6c0e930b7c816bFelix Gabriel Mance    *version         = a[AP_FCGI_HDR_VERSION_OFFSET];
7852de3551fc797566ee71165bafe05b6d81728cnotanartist    *type            = a[AP_FCGI_HDR_TYPE_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    *request_id      = (a[AP_FCGI_HDR_REQUEST_ID_B1_OFFSET] << 8)
27fdf879983dd28e211b41f3be6c0e930b7c816bFelix Gabriel Mance                     +  a[AP_FCGI_HDR_REQUEST_ID_B0_OFFSET];
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    *content_len     = (a[AP_FCGI_HDR_CONTENT_LEN_B1_OFFSET] << 8)
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                     +  a[AP_FCGI_HDR_CONTENT_LEN_B0_OFFSET];
27fdf879983dd28e211b41f3be6c0e930b7c816bFelix Gabriel Mance    *padding_len     = a[AP_FCGI_HDR_PADDING_LEN_OFFSET];
d0f58d27c2536eba454d8f77de8617bc6a2c99cdFelix Gabriel Mance}
d0f58d27c2536eba454d8f77de8617bc6a2c99cdFelix Gabriel Mance
d0f58d27c2536eba454d8f77de8617bc6a2c99cdFelix Gabriel ManceAP_DECLARE(void) ap_fcgi_begin_request_body_to_array(ap_fcgi_begin_request_body *h,
d0f58d27c2536eba454d8f77de8617bc6a2c99cdFelix Gabriel Mance                                                     unsigned char a[])
431571057e88a650a974adec93ea4bb5173b6213Felix Gabriel Mance{
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    a[AP_FCGI_BRB_ROLEB1_OFFSET]    = h->roleB1;
27fdf879983dd28e211b41f3be6c0e930b7c816bFelix Gabriel Mance    a[AP_FCGI_BRB_ROLEB0_OFFSET]    = h->roleB0;
424860079d47bf490fa98d5d7498096a0447c569mcodescu    a[AP_FCGI_BRB_FLAGS_OFFSET]     = h->flags;
60f30f0eeeacdfc1e0dfe39664373ddf5a0675adFelix Gabriel Mance    a[AP_FCGI_BRB_RESERVED0_OFFSET] = h->reserved[0];
60f30f0eeeacdfc1e0dfe39664373ddf5a0675adFelix Gabriel Mance    a[AP_FCGI_BRB_RESERVED1_OFFSET] = h->reserved[1];
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder    a[AP_FCGI_BRB_RESERVED2_OFFSET] = h->reserved[2];
424860079d47bf490fa98d5d7498096a0447c569mcodescu    a[AP_FCGI_BRB_RESERVED3_OFFSET] = h->reserved[3];
424860079d47bf490fa98d5d7498096a0447c569mcodescu    a[AP_FCGI_BRB_RESERVED4_OFFSET] = h->reserved[4];
424860079d47bf490fa98d5d7498096a0447c569mcodescu}
60f30f0eeeacdfc1e0dfe39664373ddf5a0675adFelix Gabriel Mance
d6d81ead61a5f9fb7d047e623f7898e730c258camcodescuAP_DECLARE(void) ap_fcgi_fill_in_header(ap_fcgi_header *header,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                        unsigned char type,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                        apr_uint16_t request_id,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                        apr_uint16_t content_len,
60f30f0eeeacdfc1e0dfe39664373ddf5a0675adFelix Gabriel Mance                                        unsigned char padding_len)
7852de3551fc797566ee71165bafe05b6d81728cnotanartist{
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    header->version = AP_FCGI_VERSION_1;
60f30f0eeeacdfc1e0dfe39664373ddf5a0675adFelix Gabriel Mance
9475501a6acf48434052d9e6f4a05ed6681eaaabFrancisc Nicolae Bungiu    header->type = type;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
7852de3551fc797566ee71165bafe05b6d81728cnotanartist    header->requestIdB1 = ((request_id >> 8) & 0xff);
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski    header->requestIdB0 = ((request_id) & 0xff);
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski
424860079d47bf490fa98d5d7498096a0447c569mcodescu    header->contentLengthB1 = ((content_len >> 8) & 0xff);
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder    header->contentLengthB0 = ((content_len) & 0xff);
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder
424860079d47bf490fa98d5d7498096a0447c569mcodescu    header->paddingLength = padding_len;
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder    header->reserved = 0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu}
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
d0f58d27c2536eba454d8f77de8617bc6a2c99cdFelix Gabriel ManceAP_DECLARE(void) ap_fcgi_fill_in_request_body(ap_fcgi_begin_request_body *brb,
60f30f0eeeacdfc1e0dfe39664373ddf5a0675adFelix Gabriel Mance                                              int role,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                              unsigned char flags)
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu{
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->roleB1 = ((role >> 8) & 0xff);
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->roleB0 = (role & 0xff);
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->flags = flags;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->reserved[0] = 0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->reserved[1] = 0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->reserved[2] = 0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->reserved[3] = 0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    brb->reserved[4] = 0;
3d3889e0cefcdce9b3f43c53aaa201943ac2e895Jonathan von Schroeder}
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
3d3889e0cefcdce9b3f43c53aaa201943ac2e895Jonathan von SchroederAP_DECLARE(apr_size_t) ap_fcgi_encoded_env_len(apr_table_t *env,
3d3889e0cefcdce9b3f43c53aaa201943ac2e895Jonathan von Schroeder                                               apr_size_t maxlen,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                               int *starting_elem)
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu{
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    const apr_array_header_t *envarr;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    const apr_table_entry_t *elts;
3d3889e0cefcdce9b3f43c53aaa201943ac2e895Jonathan von Schroeder    apr_size_t envlen, actualenvlen;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    int i;
31e9d2a02e15b7dbc157e0d3fb3b84f6c8666482Christian Maeder
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    if (maxlen > AP_FCGI_MAX_CONTENT_LEN) {
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        maxlen = AP_FCGI_MAX_CONTENT_LEN;
656f17ae9b7610ff2de1b6eedeeadea0c3bcdc8dChristian Maeder    }
d3cb3401882f6956de016f8eecbec1cd3b868acbFelix Gabriel Mance
d3cb3401882f6956de016f8eecbec1cd3b868acbFelix Gabriel Mance    envarr = apr_table_elts(env);
d3cb3401882f6956de016f8eecbec1cd3b868acbFelix Gabriel Mance    elts = (const apr_table_entry_t *) envarr->elts;
d3cb3401882f6956de016f8eecbec1cd3b868acbFelix Gabriel Mance
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    /* envlen - speculative, may overflow the limit
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu     * actualenvlen - len required without overflowing
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu     */
7852de3551fc797566ee71165bafe05b6d81728cnotanartist    envlen = actualenvlen = 0;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    for (i = *starting_elem; i < envarr->nelts; ) {
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        apr_size_t keylen, vallen;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        if (!elts[i].key) {
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu            (*starting_elem)++;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu            i++;
0dd6e7830de0887c9a12356447975a826b3b3db2Christian Maeder            continue;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        }
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        keylen = strlen(elts[i].key);
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        if (keylen >> 7 == 0) {
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu            envlen += 1;
06acd8a23b2f06e7b2373d53f738cf56c7f03223Francisc Nicolae Bungiu        }
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        else {
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu            envlen += 4;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        }
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        envlen += keylen;
7852de3551fc797566ee71165bafe05b6d81728cnotanartist
32bbac77828be0233953f8fe476edb0a9585408dChristian Maeder        vallen = strlen(elts[i].val);
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski        if (vallen >> 7 == 0) {
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski            envlen += 1;
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski        }
32bbac77828be0233953f8fe476edb0a9585408dChristian Maeder        else {
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski            envlen += 4;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        }
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder        envlen += vallen;
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder        if (envlen > maxlen) {
b84c87f199dc287d235d7dad6ea344f6912ef531Christian Maeder            break;
7852de3551fc797566ee71165bafe05b6d81728cnotanartist        }
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder        actualenvlen = envlen;
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder        (*starting_elem)++;
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder        i++;
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder    }
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder    return actualenvlen;
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder}
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian MaederAP_DECLARE(apr_status_t) ap_fcgi_encode_env(request_rec *r,
cf0439f74f1d55a9840d38a88f9b0f4fc00d5547Christian Maeder                                            apr_table_t *env,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                            void *buffer,
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu                                            apr_size_t buflen,
7852de3551fc797566ee71165bafe05b6d81728cnotanartist                                            int *starting_elem)
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu{
7852de3551fc797566ee71165bafe05b6d81728cnotanartist    apr_status_t rv = APR_SUCCESS;
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski    const apr_array_header_t *envarr;
624f8c31bd8d6746b93f4b5966aa6fc7680fefc5Felix Gabriel Mance    const apr_table_entry_t *elts;
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski    char *itr;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    int i;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    envarr = apr_table_elts(env);
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    elts = (const apr_table_entry_t *) envarr->elts;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu    itr = buffer;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu
b84c87f199dc287d235d7dad6ea344f6912ef531Christian Maeder    for (i = *starting_elem; i < envarr->nelts; ) {
624f8c31bd8d6746b93f4b5966aa6fc7680fefc5Felix Gabriel Mance        apr_size_t keylen, vallen;
7852de3551fc797566ee71165bafe05b6d81728cnotanartist
624f8c31bd8d6746b93f4b5966aa6fc7680fefc5Felix Gabriel Mance        if (!elts[i].key) {
1a38107941725211e7c3f051f7a8f5e12199f03acmaeder            (*starting_elem)++;
80875f917d741946a39d0ec0b5721e46ba609823Till Mossakowski            i++;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu            continue;
ee93ea764a2b8189253e912c8447f9419033f6d4Francisc Nicolae Bungiu        }
d0f58d27c2536eba454d8f77de8617bc6a2c99cdFelix Gabriel Mance
431571057e88a650a974adec93ea4bb5173b6213Felix Gabriel Mance        keylen = strlen(elts[i].key);
431571057e88a650a974adec93ea4bb5173b6213Felix Gabriel Mance
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu        if (keylen >> 7 == 0) {
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            if (buflen < 1) {
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu                rv = APR_ENOSPC; /* overflow */
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu                break;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            }
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr[0] = keylen & 0xff;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr += 1;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            buflen -= 1;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu        }
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu        else {
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            if (buflen < 4) {
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu                rv = APR_ENOSPC; /* overflow */
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu                break;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            }
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr[0] = ((keylen >> 24) & 0xff) | 0x80;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr[1] = ((keylen >> 16) & 0xff);
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr[2] = ((keylen >> 8) & 0xff);
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr[3] = ((keylen) & 0xff);
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            itr += 4;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu            buflen -= 4;
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu        }
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu        vallen = strlen(elts[i].val);
b90f0b7fd6ccfbdd7e5adb65b1f6c02c7758ff5cmcodescu
        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;
        }
        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;
}