/* 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 "ajp_header.h"

#include "ajp.h"

APLOG_USE_MODULE(proxy_ajp);

static const char *response_trans_headers[] = {

    "Content-Type",

    "Content-Language",

    "Content-Length",

    "Date",

    "Last-Modified",

    "Location",

    "Set-Cookie",

    "Set-Cookie2",

    "Servlet-Engine",

    "Status",

    "WWW-Authenticate"

};

static const char *long_res_header_for_sc(int sc)

{

    const char *rc = NULL;

    sc = sc & 0X00FF;

    if (sc <= SC_RES_HEADERS_NUM && sc > 0) {

        rc = response_trans_headers[sc - 1];

    }

    return rc;

}

#define UNKNOWN_METHOD (-1)

static int sc_for_req_header(const char *header_name)

{

    char header[16];

    apr_size_t len = strlen(header_name);

    const char *p = header_name;

    int i = 0;

    /* ACCEPT-LANGUAGE is the longest header

     * that is of interest.

     */

    if (len < 4 || len > 15)

        return UNKNOWN_METHOD;

    while (*p)

        header[i++] = apr_toupper(*p++);

    header[i] = '\0';

    p = &header[1];

    switch (header[0]) {

        case 'A':

            if (memcmp(p, "CCEPT", 5) == 0) {

                if (!header[6])

                    return SC_ACCEPT;

                else if (header[6] == '-') {

                    p += 6;

                    if (strcmp(p, "CHARSET") == 0)

                        return SC_ACCEPT_CHARSET;

                    else if (strcmp(p,  "ENCODING") == 0)

                        return SC_ACCEPT_ENCODING;

                    else if (strcmp(p, "LANGUAGE") == 0)

                        return SC_ACCEPT_LANGUAGE;

                    else

                        return UNKNOWN_METHOD;

                }

                else

                    return UNKNOWN_METHOD;

            }

            else if (strcmp(p, "UTHORIZATION") == 0)

                return SC_AUTHORIZATION;

            else

                return UNKNOWN_METHOD;

        break;

        case 'C':

            if (strcmp(p, "OOKIE2") == 0)

                return SC_COOKIE2;

            else if (strcmp(p, "OOKIE") == 0)

                return SC_COOKIE;

            else if (strcmp(p, "ONNECTION") == 0)

                return SC_CONNECTION;

            else if (strcmp(p, "ONTENT-TYPE") == 0)

                return SC_CONTENT_TYPE;

            else if (strcmp(p, "ONTENT-LENGTH") == 0)

                return SC_CONTENT_LENGTH;

            else

                return UNKNOWN_METHOD;

        break;

        case 'H':

            if (strcmp(p, "OST") == 0)

                return SC_HOST;

            else

                return UNKNOWN_METHOD;

        break;

        case 'P':

            if (strcmp(p, "RAGMA") == 0)

                return SC_PRAGMA;

            else

                return UNKNOWN_METHOD;

        break;

        case 'R':

            if (strcmp(p, "EFERER") == 0)

                return SC_REFERER;

            else

                return UNKNOWN_METHOD;

        break;

        case 'U':

            if (strcmp(p, "SER-AGENT") == 0)

                return SC_USER_AGENT;

            else

                return UNKNOWN_METHOD;

        break;

        default:

            return UNKNOWN_METHOD;

    }

    /* NOTREACHED */

}

/* Apache method number to SC methods transform table */

static const unsigned char sc_for_req_method_table[] = {

    SC_M_GET,

    SC_M_PUT,

    SC_M_POST,

    SC_M_DELETE,

    0,                      /* M_CONNECT */

    SC_M_OPTIONS,

    SC_M_TRACE,

    0,                      /* M_PATCH  */

    SC_M_PROPFIND,

    SC_M_PROPPATCH,

    SC_M_MKCOL,

    SC_M_COPY,

    SC_M_MOVE,

    SC_M_LOCK,

    SC_M_UNLOCK,

    SC_M_VERSION_CONTROL,

    SC_M_CHECKOUT,

    SC_M_UNCHECKOUT,

    SC_M_CHECKIN,

    SC_M_UPDATE,

    SC_M_LABEL,

    SC_M_REPORT,

    SC_M_MKWORKSPACE,

    SC_M_MKACTIVITY,

    SC_M_BASELINE_CONTROL,

    SC_M_MERGE,

    0                       /* M_INVALID */

};

static int sc_for_req_method_by_id(request_rec *r)

{

    int method_id = r->method_number;

    if (method_id < 0 || method_id > M_INVALID) {

        return UNKNOWN_METHOD;

    }

    else if (r->header_only) {

        return SC_M_HEAD;

    }

    else {

        return sc_for_req_method_table[method_id] ?

               sc_for_req_method_table[method_id] : UNKNOWN_METHOD;

    }

}

/*

 * Message structure

 *

 *

AJPV13_REQUEST/AJPV14_REQUEST=

    request_prefix (1) (byte)

    method         (byte)

    protocol       (string)

    req_uri        (string)

    remote_addr    (string)

    remote_host    (string)

    server_name    (string)

    server_port    (short)

    is_ssl         (boolean)

    num_headers    (short)

    num_headers*(req_header_name header_value)

    ?context       (byte)(string)

    ?servlet_path  (byte)(string)

    ?remote_user   (byte)(string)

    ?auth_type     (byte)(string)

    ?query_string  (byte)(string)

    ?jvm_route     (byte)(string)

    ?ssl_cert      (byte)(string)

    ?ssl_cipher    (byte)(string)

    ?ssl_session   (byte)(string)

    ?ssl_key_size  (byte)(int)      via JkOptions +ForwardKeySize

    request_terminator (byte)

    ?body          content_length*(var binary)

 */

static apr_status_t ajp_marshal_into_msgb(ajp_msg_t *msg,

                                          request_rec *r,

                                          apr_uri_t *uri)

{

    int method;

    apr_uint32_t i, num_headers = 0;

    apr_byte_t is_ssl;

    char *remote_host;

    const char *session_route, *envvar;

    const apr_array_header_t *arr = apr_table_elts(r->subprocess_env);

    const apr_table_entry_t *elts = (const apr_table_entry_t *)arr->elts;

    ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, "Into ajp_marshal_into_msgb");

    if ((method = sc_for_req_method_by_id(r)) == UNKNOWN_METHOD) {

        ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, APLOGNO(02437)

               "ajp_marshal_into_msgb - Sending unknown method %s as request attribute",

               r->method);

        method = SC_M_JK_STORED;

    }

    is_ssl = (apr_byte_t) ap_proxy_conn_is_https(r->connection);

    if (r->headers_in && apr_table_elts(r->headers_in)) {

        const apr_array_header_t *t = apr_table_elts(r->headers_in);

        num_headers = t->nelts;

    }

    remote_host = (char *)ap_get_useragent_host(r, REMOTE_HOST, NULL);

    ajp_msg_reset(msg);

    if (ajp_msg_append_uint8(msg, CMD_AJP13_FORWARD_REQUEST)     ||

        ajp_msg_append_uint8(msg, (apr_byte_t) method)           ||

        ajp_msg_append_string(msg, r->protocol)                  ||

        ajp_msg_append_string(msg, uri->path)                    ||

        ajp_msg_append_string(msg, r->useragent_ip)              ||

        ajp_msg_append_string(msg, remote_host)                  ||

        ajp_msg_append_string(msg, ap_get_server_name(r))        ||

        ajp_msg_append_uint16(msg, (apr_uint16_t)r->connection->local_addr->port) ||

        ajp_msg_append_uint8(msg, is_ssl)                        ||

        ajp_msg_append_uint16(msg, (apr_uint16_t) num_headers)) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00968)

               "ajp_marshal_into_msgb: "

               "Error appending the message beginning");

        return APR_EGENERAL;

    }

    for (i = 0 ; i < num_headers ; i++) {

        int sc;

        const apr_array_header_t *t = apr_table_elts(r->headers_in);

        const apr_table_entry_t *elts = (apr_table_entry_t *)t->elts;

        if ((sc = sc_for_req_header(elts[i].key)) != UNKNOWN_METHOD) {

            if (ajp_msg_append_uint16(msg, (apr_uint16_t)sc)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00969)

                       "ajp_marshal_into_msgb: "

                       "Error appending the header name");

                return AJP_EOVERFLOW;

            }

        }

        else {

            if (ajp_msg_append_string(msg, elts[i].key)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00970)

                       "ajp_marshal_into_msgb: "

                       "Error appending the header name");

                return AJP_EOVERFLOW;

            }

        }

        if (ajp_msg_append_string(msg, elts[i].val)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00971)

                   "ajp_marshal_into_msgb: "

                   "Error appending the header value");

            return AJP_EOVERFLOW;

        }

        ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r,

                   "ajp_marshal_into_msgb: Header[%d] [%s] = [%s]",

                   i, elts[i].key, elts[i].val);

    }

/* XXXX need to figure out how to do this

    if (s->secret) {

        if (ajp_msg_append_uint8(msg, SC_A_SECRET) ||

            ajp_msg_append_string(msg, s->secret)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(03228)

                   "Error ajp_marshal_into_msgb - "

                   "Error appending secret");

            return APR_EGENERAL;

        }

    }

 */

    if (r->user) {

        if (ajp_msg_append_uint8(msg, SC_A_REMOTE_USER) ||

            ajp_msg_append_string(msg, r->user)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00972)

                   "ajp_marshal_into_msgb: "

                   "Error appending the remote user");

            return AJP_EOVERFLOW;

        }

    }

    if (r->ap_auth_type) {

        if (ajp_msg_append_uint8(msg, SC_A_AUTH_TYPE) ||

            ajp_msg_append_string(msg, r->ap_auth_type)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00973)

                   "ajp_marshal_into_msgb: "

                   "Error appending the auth type");

            return AJP_EOVERFLOW;

        }

    }

    /* XXXX  ebcdic (args converted?) */

    if (uri->query) {

        if (ajp_msg_append_uint8(msg, SC_A_QUERY_STRING) ||

            ajp_msg_append_string(msg, uri->query)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00974)

                   "ajp_marshal_into_msgb: "

                   "Error appending the query string");

            return AJP_EOVERFLOW;

        }

    }

    if ((session_route = apr_table_get(r->notes, "session-route"))) {

        if (ajp_msg_append_uint8(msg, SC_A_JVM_ROUTE) ||

            ajp_msg_append_string(msg, session_route)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00975)

                   "ajp_marshal_into_msgb: "

                   "Error appending the jvm route");

            return AJP_EOVERFLOW;

        }

    }

/* XXX: Is the subprocess_env a right place?

 * <Location /examples>

 *   ProxyPass ajp://remote:8009/servlets-examples

 *   SetEnv SSL_SESSION_ID CUSTOM_SSL_SESSION_ID

 * </Location>

 */

    /*

     * Only lookup SSL variables if we are currently running HTTPS.

     * Furthermore ensure that only variables get set in the AJP message

     * that are not NULL and not empty.

     */

    if (is_ssl) {

        if ((envvar = ap_proxy_ssl_val(r->pool, r->server, r->connection, r,

                                       AJP13_SSL_CLIENT_CERT_INDICATOR))

            && envvar[0]) {

            if (ajp_msg_append_uint8(msg, SC_A_SSL_CERT)

                || ajp_msg_append_string(msg, envvar)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00976)

                              "ajp_marshal_into_msgb: "

                              "Error appending the SSL certificates");

                return AJP_EOVERFLOW;

            }

        }

        if ((envvar = ap_proxy_ssl_val(r->pool, r->server, r->connection, r,

                                       AJP13_SSL_CIPHER_INDICATOR))

            && envvar[0]) {

            if (ajp_msg_append_uint8(msg, SC_A_SSL_CIPHER)

                || ajp_msg_append_string(msg, envvar)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00977)

                              "ajp_marshal_into_msgb: "

                              "Error appending the SSL ciphers");

                return AJP_EOVERFLOW;

            }

        }

        if ((envvar = ap_proxy_ssl_val(r->pool, r->server, r->connection, r,

                                       AJP13_SSL_SESSION_INDICATOR))

            && envvar[0]) {

            if (ajp_msg_append_uint8(msg, SC_A_SSL_SESSION)

                || ajp_msg_append_string(msg, envvar)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00978)

                              "ajp_marshal_into_msgb: "

                              "Error appending the SSL session");

                return AJP_EOVERFLOW;

            }

        }

        /* ssl_key_size is required by Servlet 2.3 API */

        if ((envvar = ap_proxy_ssl_val(r->pool, r->server, r->connection, r,

                                       AJP13_SSL_KEY_SIZE_INDICATOR))

            && envvar[0]) {

            if (ajp_msg_append_uint8(msg, SC_A_SSL_KEY_SIZE)

                || ajp_msg_append_uint16(msg, (unsigned short) atoi(envvar))) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00979)

                              "ajp_marshal_into_msgb: "

                              "Error appending the SSL key size");

                return APR_EGENERAL;

            }

        }

    }

    /* If the method was unrecognized, encode it as an attribute */

    if (method == SC_M_JK_STORED) {

        if (ajp_msg_append_uint8(msg, SC_A_STORED_METHOD)

            || ajp_msg_append_string(msg, r->method)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02438)

                          "ajp_marshal_into_msgb: "

                          "Error appending the method '%s' as request attribute",

                          r->method);

            return AJP_EOVERFLOW;

        }

    }

    /* Forward the SSL protocol name.

     * Modern Tomcat versions know how to retrieve

     * the protocol name from this attribute.

     */

    if (is_ssl) {

        if ((envvar = ap_proxy_ssl_val(r->pool, r->server, r->connection, r,

                                       AJP13_SSL_PROTOCOL_INDICATOR))

            && envvar[0]) {

            const char *key = SC_A_SSL_PROTOCOL;

            if (ajp_msg_append_uint8(msg, SC_A_REQ_ATTRIBUTE) ||

                ajp_msg_append_string(msg, key)   ||

                ajp_msg_append_string(msg, envvar)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02830)

                        "ajp_marshal_into_msgb: "

                        "Error appending attribute %s=%s",

                        key, envvar);

                return AJP_EOVERFLOW;

            }

        }

    }

    /* Forward the remote port information, which was forgotten

     * from the builtin data of the AJP 13 protocol.

     * Since the servlet spec allows to retrieve it via getRemotePort(),

     * we provide the port to the Tomcat connector as a request

     * attribute. Modern Tomcat versions know how to retrieve

     * the remote port from this attribute.

     */

    {

        const char *key = SC_A_REQ_REMOTE_PORT;

        char *val = apr_itoa(r->pool, r->useragent_addr->port);

        if (ajp_msg_append_uint8(msg, SC_A_REQ_ATTRIBUTE) ||

            ajp_msg_append_string(msg, key)   ||

            ajp_msg_append_string(msg, val)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00980)

                    "ajp_marshal_into_msgb: "

                    "Error appending attribute %s=%s",

                    key, val);

            return AJP_EOVERFLOW;

        }

    }

    /* Forward the local ip address information, which was forgotten

     * from the builtin data of the AJP 13 protocol.

     * Since the servlet spec allows to retrieve it via getLocalAddr(),

     * we provide the address to the Tomcat connector as a request

     * attribute. Modern Tomcat versions know how to retrieve

     * the local address from this attribute.

     */

    {

        const char *key = SC_A_REQ_LOCAL_ADDR;

        char *val = r->connection->local_ip;

        if (ajp_msg_append_uint8(msg, SC_A_REQ_ATTRIBUTE) ||

            ajp_msg_append_string(msg, key)   ||

            ajp_msg_append_string(msg, val)) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02646)

                    "ajp_marshal_into_msgb: "

                    "Error appending attribute %s=%s",

                    key, val);

            return AJP_EOVERFLOW;

        }

    }

    /* Use the environment vars prefixed with AJP_

     * and pass it to the header striping that prefix.

     */

    for (i = 0; i < (apr_uint32_t)arr->nelts; i++) {

        if (!strncmp(elts[i].key, "AJP_", 4)) {

            if (ajp_msg_append_uint8(msg, SC_A_REQ_ATTRIBUTE) ||

                ajp_msg_append_string(msg, elts[i].key + 4)   ||

                ajp_msg_append_string(msg, elts[i].val)) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00981)

                        "ajp_marshal_into_msgb: "

                        "Error appending attribute %s=%s",

                        elts[i].key, elts[i].val);

                return AJP_EOVERFLOW;

            }

        }

    }

    if (ajp_msg_append_uint8(msg, SC_A_ARE_DONE)) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00982)

               "ajp_marshal_into_msgb: "

               "Error appending the message end");

        return AJP_EOVERFLOW;

    }

    ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,

            "ajp_marshal_into_msgb: Done");

    return APR_SUCCESS;

}

/*

AJPV13_RESPONSE/AJPV14_RESPONSE:=

    response_prefix (2)

    status          (short)

    status_msg      (short)

    num_headers     (short)

    num_headers*(res_header_name header_value)

    *body_chunk

    terminator      boolean 

req_header_name :=

    sc_req_header_name | (string)

res_header_name :=

    sc_res_header_name | (string)

header_value :=

    (string)

body_chunk :=

    length  (short)

    body    length*(var binary)

 */

static int addit_dammit(void *v, const char *key, const char *val)

{

    apr_table_addn(v, key, val);

    return 1;

}

static apr_status_t ajp_unmarshal_response(ajp_msg_t *msg,

                                           request_rec *r,

                                           proxy_dir_conf *dconf)

{

    apr_uint16_t status;

    apr_status_t rc;

    const char *ptr;

    apr_uint16_t  num_headers;

    int i;

    rc = ajp_msg_get_uint16(msg, &status);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00983)

                "ajp_unmarshal_response: Null status");

        return rc;

    }

    r->status = status;

    rc = ajp_msg_get_string(msg, &ptr);

    if (rc == APR_SUCCESS) {

#if APR_CHARSET_EBCDIC /* copy only if we have to */

        ptr = apr_pstrdup(r->pool, ptr);

        ap_xlate_proto_from_ascii(ptr, strlen(ptr));

#endif

        r->status_line =  apr_psprintf(r->pool, "%d %s", status, ptr);

    }

    else {

        r->status_line = NULL;

    }

    ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r,

           "ajp_unmarshal_response: status = %d", status);

    rc = ajp_msg_get_uint16(msg, &num_headers);

    if (rc == APR_SUCCESS) {

        apr_table_t *save_table;

        /* First, tuck away all already existing cookies */

        /*

         * Could optimize here, but just in case we want to

         * also save other headers, keep this logic.

         */

        save_table = apr_table_make(r->pool, num_headers + 2);

        apr_table_do(addit_dammit, save_table, r->headers_out,

                     "Set-Cookie", NULL);

        r->headers_out = save_table;

    }

    else {

        r->headers_out = NULL;

        num_headers = 0;

    }

    ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r,

           "ajp_unmarshal_response: Number of headers is = %d",

           num_headers);

    for (i = 0; i < (int)num_headers; i++) {

        apr_uint16_t name;

        const char *stringname;

        const char *value;

        rc  = ajp_msg_peek_uint16(msg, &name);

        if (rc != APR_SUCCESS) {

            return rc;

        }

        if ((name & 0XFF00) == 0XA000) {

            ajp_msg_get_uint16(msg, &name);

            stringname = long_res_header_for_sc(name);

            if (stringname == NULL) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00984)

                       "ajp_unmarshal_response: "

                       "No such sc (%08x)",

                       name);

                return AJP_EBAD_HEADER;

            }

        }

        else {

            name = 0;

            rc = ajp_msg_get_string(msg, &stringname);

            if (rc != APR_SUCCESS) {

                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00985)

                       "ajp_unmarshal_response: "

                       "Null header name");

                return rc;

            }

            ap_xlate_proto_from_ascii(stringname, strlen(stringname));

        }

        rc = ajp_msg_get_string(msg, &value);

        if (rc != APR_SUCCESS) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00986)

                   "ajp_unmarshal_response: "

                   "Null header value");

            return rc;

        }

        /* Set-Cookie need additional processing */

        if (!strcasecmp(stringname, "Set-Cookie")) {

            value = ap_proxy_cookie_reverse_map(r, dconf, value);

        }

        /* Location, Content-Location, URI and Destination need additional

         * processing */

        else if (!strcasecmp(stringname, "Location")

                 || !strcasecmp(stringname, "Content-Location")

                 || !strcasecmp(stringname, "URI")

                 || !strcasecmp(stringname, "Destination"))

        {

          value = ap_proxy_location_reverse_map(r, dconf, value);

        }

        ap_xlate_proto_from_ascii(value, strlen(value));

        ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r,

               "ajp_unmarshal_response: Header[%d] [%s] = [%s]",

                       i, stringname, value);

        apr_table_add(r->headers_out, stringname, value);

        /* Content-type needs an additional handling */

        if (strcasecmp(stringname, "Content-Type") == 0) {

             /* add corresponding filter */

            ap_set_content_type(r, apr_pstrdup(r->pool, value));

            ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r,

               "ajp_unmarshal_response: ap_set_content_type to '%s'", value);

        }

    }

    return APR_SUCCESS;

}

/*

 * Build the ajp header message and send it

 */

apr_status_t ajp_send_header(apr_socket_t *sock,

                             request_rec *r,

                             apr_size_t buffsize,

                             apr_uri_t *uri)

{

    ajp_msg_t *msg;

    apr_status_t rc;

    rc = ajp_msg_create(r->pool, buffsize, &msg;;

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00987)

               "ajp_send_header: ajp_msg_create failed");

        return rc;

    }

    rc = ajp_marshal_into_msgb(msg, r, uri);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00988)

               "ajp_send_header: ajp_marshal_into_msgb failed");

        return rc;

    }

    rc = ajp_ilink_send(sock, msg);

    ajp_msg_log(r, msg, "ajp_send_header: ajp_ilink_send packet dump");

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00989)

               "ajp_send_header: ajp_ilink_send failed");

        return rc;

    }

    return APR_SUCCESS;

}

/*

 * Read the ajp message and return the type of the message.

 */

apr_status_t ajp_read_header(apr_socket_t *sock,

                             request_rec  *r,

                             apr_size_t buffsize,

                             ajp_msg_t **msg)

{

    apr_byte_t result;

    apr_status_t rc;

    if (*msg) {

        rc = ajp_msg_reuse(*msg);

        if (rc != APR_SUCCESS) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00990)

                   "ajp_read_header: ajp_msg_reuse failed");

            return rc;

        }

    }

    else {

        rc = ajp_msg_create(r->pool, buffsize, msg);

        if (rc != APR_SUCCESS) {

            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00991)

                   "ajp_read_header: ajp_msg_create failed");

            return rc;

        }

    }

    ajp_msg_reset(*msg);

    rc = ajp_ilink_receive(sock, *msg);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00992)

               "ajp_read_header: ajp_ilink_receive failed");

        return rc;

    }

    ajp_msg_log(r, *msg, "ajp_read_header: ajp_ilink_receive packet dump");

    rc = ajp_msg_peek_uint8(*msg, &result);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00993)

                      "ajp_read_header: ajp_msg_peek_uint8 failed");

        return rc;

    }

    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,

               "ajp_read_header: ajp_ilink_received %s (0x%02x)",

               ajp_type_str(result), result);

    return APR_SUCCESS;

}

/* parse the msg to read the type */

int ajp_parse_type(request_rec  *r, ajp_msg_t *msg)

{

    apr_byte_t result;

    ajp_msg_peek_uint8(msg, &result);

    ap_log_rerror(APLOG_MARK, APLOG_TRACE6, 0, r,

               "ajp_parse_type: got %s (0x%02x)",

               ajp_type_str(result), result);

    return (int) result;

}

/* parse the header */

apr_status_t ajp_parse_header(request_rec  *r, proxy_dir_conf *conf,

                              ajp_msg_t *msg)

{

    apr_byte_t result;

    apr_status_t rc;

    rc = ajp_msg_get_uint8(msg, &result);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00994)

               "ajp_parse_headers: ajp_msg_get_byte failed");

        return rc;

    }

    if (result != CMD_AJP13_SEND_HEADERS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00995)

               "ajp_parse_headers: wrong type %s (0x%02x) expecting %s (0x%02x)",

               ajp_type_str(result), result,

               ajp_type_str(CMD_AJP13_SEND_HEADERS), CMD_AJP13_SEND_HEADERS);

        return AJP_EBAD_HEADER;

    }

    return ajp_unmarshal_response(msg, r, conf);

}

/* parse the body and return data address and length */

apr_status_t  ajp_parse_data(request_rec  *r, ajp_msg_t *msg,

                             apr_uint16_t *len, char **ptr)

{

    apr_byte_t result;

    apr_status_t rc;

    apr_uint16_t expected_len;

    rc = ajp_msg_get_uint8(msg, &result);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00996)

               "ajp_parse_data: ajp_msg_get_byte failed");

        return rc;

    }

    if (result != CMD_AJP13_SEND_BODY_CHUNK) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00997)

               "ajp_parse_data: wrong type %s (0x%02x) expecting %s (0x%02x)",

               ajp_type_str(result), result,

               ajp_type_str(CMD_AJP13_SEND_BODY_CHUNK), CMD_AJP13_SEND_BODY_CHUNK);

        return AJP_EBAD_HEADER;

    }

    rc = ajp_msg_get_uint16(msg, len);

    if (rc != APR_SUCCESS) {

        return rc;

    }

    /*

     * msg->len contains the complete length of the message including all

     * headers. So the expected length for a CMD_AJP13_SEND_BODY_CHUNK is

     * msg->len minus the sum of

     * AJP_HEADER_LEN    : The length of the header to every AJP message.

     * AJP_HEADER_SZ_LEN : The header giving the size of the chunk.

     * 1                 : The CMD_AJP13_SEND_BODY_CHUNK indicator byte (0x03).

     * 1                 : The last byte of this message always seems to be

     *                     0x00 and is not part of the chunk.

     */

    expected_len = msg->len - (AJP_HEADER_LEN + AJP_HEADER_SZ_LEN + 1 + 1);

    if (*len != expected_len) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00998)

               "ajp_parse_data: Wrong chunk length. Length of chunk is %i,"

               " expected length is %i.", *len, expected_len);

        return AJP_EBAD_HEADER;

    }

    *ptr = (char *)&(msg->buf[msg->pos]);

    return APR_SUCCESS;

}

/* Check the reuse flag in CMD_AJP13_END_RESPONSE */

apr_status_t ajp_parse_reuse(request_rec *r, ajp_msg_t *msg,

                             apr_byte_t *reuse)

{

    apr_byte_t result;

    apr_status_t rc;

    rc = ajp_msg_get_uint8(msg, &result);

    if (rc != APR_SUCCESS) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00999)

               "ajp_parse_reuse: ajp_msg_get_byte failed");

        return rc;

    }

    if (result != CMD_AJP13_END_RESPONSE) {

        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01000)

               "ajp_parse_reuse: wrong type %s (0x%02x) expecting %s (0x%02x)",

               ajp_type_str(result), result,

               ajp_type_str(CMD_AJP13_END_RESPONSE), CMD_AJP13_END_RESPONSE);

        return AJP_EBAD_HEADER;

    }

    return ajp_msg_get_uint8(msg, reuse);

}

/*

 * Allocate a msg to send data

 */

apr_status_t  ajp_alloc_data_msg(apr_pool_t *pool, char **ptr, apr_size_t *len,

                                 ajp_msg_t **msg)

{

    apr_status_t rc;

    if ((rc = ajp_msg_create(pool, *len, msg)) != APR_SUCCESS)

        return rc;

    ajp_msg_reset(*msg);

    *ptr = (char *)&((*msg)->buf[6]);

    *len =  *len - 6;

    return APR_SUCCESS;

}

/*

 * Send the data message

 */

apr_status_t  ajp_send_data_msg(apr_socket_t *sock,

                                ajp_msg_t *msg, apr_size_t len)

{

    msg->buf[4] = (apr_byte_t)((len >> 8) & 0xFF);

    msg->buf[5] = (apr_byte_t)(len & 0xFF);