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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.
+ */
+
+/**
+ * @file ajp.h
+ * @brief Apache Jserv Protocol
+ *
+ * @defgroup AJP_defines mod_proxy AJP definitions
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef AJP_H
+#define AJP_H
+
+#include "apr_version.h"
+#include "apr.h"
+
+#include "apr_hooks.h"
+#include "apr_lib.h"
+#include "apr_strings.h"
+#include "apr_buckets.h"
+#include "apr_md5.h"
+#include "apr_network_io.h"
+#include "apr_poll.h"
+#include "apr_pools.h"
+#include "apr_strings.h"
+#include "apr_uri.h"
+#include "apr_date.h"
+#include "apr_fnmatch.h"
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#if APR_HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#define AJP13_DEF_HOST "127.0.0.1"
+#ifdef NETWARE
+#define AJP13_DEF_PORT 9009 /* default to 9009 since 8009 is used by OS */
+#else
+#define AJP13_DEF_PORT 8009
+#endif
+
+/* The following environment variables match mod_ssl! */
+#define AJP13_HTTPS_INDICATOR "HTTPS"
+#define AJP13_SSL_PROTOCOL_INDICATOR "SSL_PROTOCOL"
+#define AJP13_SSL_CLIENT_CERT_INDICATOR "SSL_CLIENT_CERT"
+#define AJP13_SSL_CIPHER_INDICATOR "SSL_CIPHER"
+#define AJP13_SSL_SESSION_INDICATOR "SSL_SESSION_ID"
+#define AJP13_SSL_KEY_SIZE_INDICATOR "SSL_CIPHER_USEKEYSIZE"
+
+#ifdef AJP_USE_HTTPD_WRAP
+#include "httpd_wrap.h"
+#else
+#include "httpd.h"
+#include "http_config.h"
+#include "http_request.h"
+#include "http_core.h"
+#include "http_protocol.h"
+#include "http_main.h"
+#include "http_log.h"
+#endif
+
+#include "mod_proxy.h"
+#include "util_ebcdic.h"
+
+/** AJP Specific error codes
+ */
+/** Buffer overflow exception */
+#define AJP_EOVERFLOW (APR_OS_START_USERERR + 1)
+/** Destination Buffer is to small */
+#define AJP_ETOSMALL (APR_OS_START_USERERR + 2)
+/** Invalid input parameters */
+#define AJP_EINVAL (APR_OS_START_USERERR + 3)
+/** Bad message signature */
+#define AJP_EBAD_SIGNATURE (APR_OS_START_USERERR + 4)
+/** Incoming message too bg */
+#define AJP_ETOBIG (APR_OS_START_USERERR + 5)
+/** Missing message header */
+#define AJP_ENO_HEADER (APR_OS_START_USERERR + 6)
+/** Bad message header */
+#define AJP_EBAD_HEADER (APR_OS_START_USERERR + 7)
+/** Bad message */
+#define AJP_EBAD_MESSAGE (APR_OS_START_USERERR + 8)
+/** Cant log via AJP14 */
+#define AJP_ELOGFAIL (APR_OS_START_USERERR + 9)
+/** Bad request method */
+#define AJP_EBAD_METHOD (APR_OS_START_USERERR + 10)
+
+
+/** A structure that represents ajp message */
+typedef struct ajp_msg ajp_msg_t;
+
+/** A structure that represents ajp message */
+struct ajp_msg
+{
+ /** The buffer holding a AJP message */
+ apr_byte_t *buf;
+ /** The length of AJP message header (defaults to AJP_HEADER_LEN) */
+ apr_size_t header_len;
+ /** The length of AJP message */
+ apr_size_t len;
+ /** The current read position */
+ apr_size_t pos;
+ /** Flag indicating the origing of the message */
+ int server_side;
+ /** The size of the buffer */
+ apr_size_t max_size;
+};
+
+/**
+ * Signature for the messages sent from Apache to tomcat
+ */
+#define AJP13_WS_HEADER 0x1234
+#define AJP_HEADER_LEN 4
+#define AJP_HEADER_SZ_LEN 2
+#define AJP_HEADER_SZ 6
+#define AJP_MSG_BUFFER_SZ 8192
+#define AJP_MAX_BUFFER_SZ 65536
+#define AJP13_MAX_SEND_BODY_SZ (AJP_MAX_BUFFER_SZ - AJP_HEADER_SZ)
+#define AJP_PING_PONG_SZ 128
+
+/** Send a request from web server to container*/
+#define CMD_AJP13_FORWARD_REQUEST (unsigned char)2
+/** Write a body chunk from the servlet container to the web server */
+#define CMD_AJP13_SEND_BODY_CHUNK (unsigned char)3
+/** Send response headers from the servlet container to the web server. */
+#define CMD_AJP13_SEND_HEADERS (unsigned char)4
+/** Marks the end of response. */
+#define CMD_AJP13_END_RESPONSE (unsigned char)5
+/** Get further data from the web server if it hasn't all been transferred yet. */
+#define CMD_AJP13_GET_BODY_CHUNK (unsigned char)6
+/** The web server asks the container to shut itself down. */
+#define CMD_AJP13_SHUTDOWN (unsigned char)7
+/** Webserver ask container to take control (logon phase) */
+#define CMD_AJP13_PING (unsigned char)8
+/** Container response to cping request */
+#define CMD_AJP13_CPONG (unsigned char)9
+/** Webserver check if container is alive, since container should respond by cpong */
+#define CMD_AJP13_CPING (unsigned char)10
+
+/** @} */
+
+/**
+ * @defgroup AJP_api AJP API functions
+ * @ingroup MOD_PROXY
+ * @{
+ */
+/**
+ * Check a new AJP Message by looking at signature and return its size
+ *
+ * @param msg AJP Message to check
+ * @param len Pointer to returned len
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_check_header(ajp_msg_t *msg, apr_size_t *len);
+
+/**
+ * Reset an AJP Message
+ *
+ * @param msg AJP Message to reset
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_reset(ajp_msg_t *msg);
+
+/**
+ * Reuse an AJP Message
+ *
+ * @param msg AJP Message to reuse
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_reuse(ajp_msg_t *msg);
+
+/**
+ * Mark the end of an AJP Message
+ *
+ * @param msg AJP Message to end
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_end(ajp_msg_t *msg);
+
+/**
+ * Add an unsigned 32bits value to AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param value value to add to AJP Message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_append_uint32(ajp_msg_t *msg, apr_uint32_t value);
+
+/**
+ * Add an unsigned 16bits value to AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param value value to add to AJP Message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_append_uint16(ajp_msg_t *msg, apr_uint16_t value);
+
+/**
+ * Add an unsigned 8bits value to AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param value value to add to AJP Message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_append_uint8(ajp_msg_t *msg, apr_byte_t value);
+
+/**
+ * Add a String in AJP message, and transform the String in ASCII
+ * if convert is set and we're on an EBCDIC machine
+ *
+ * @param msg AJP Message to get value from
+ * @param value Pointer to String
+ * @param convert When set told to convert String to ASCII
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_append_string_ex(ajp_msg_t *msg, const char *value,
+ int convert);
+/**
+ * Add a String in AJP message, and transform
+ * the String in ASCII if we're on an EBCDIC machine
+ */
+#define ajp_msg_append_string(m, v) ajp_msg_append_string_ex(m, v, 1)
+
+/**
+ * Add a String in AJP message.
+ */
+#define ajp_msg_append_string_ascii(m, v) ajp_msg_append_string_ex(m, v, 0)
+
+/**
+ * Add a Byte array to AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param value Pointer to Byte array
+ * @param valuelen Byte array len
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_append_bytes(ajp_msg_t *msg, const apr_byte_t *value,
+ apr_size_t valuelen);
+
+/**
+ * Get a 32bits unsigned value from AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_get_uint32(ajp_msg_t *msg, apr_uint32_t *rvalue);
+
+/**
+ * Get a 16bits unsigned value from AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_get_uint16(ajp_msg_t *msg, apr_uint16_t *rvalue);
+
+/**
+ * Peek a 16bits unsigned value from AJP Message, position in message
+ * is not updated
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_peek_uint16(ajp_msg_t *msg, apr_uint16_t *rvalue);
+
+/**
+ * Get a 8bits unsigned value from AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_get_uint8(ajp_msg_t *msg, apr_byte_t *rvalue);
+
+/**
+ * Peek a 8bits unsigned value from AJP Message, position in message
+ * is not updated
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_peek_uint8(ajp_msg_t *msg, apr_byte_t *rvalue);
+
+/**
+ * Get a String value from AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_get_string(ajp_msg_t *msg, const char **rvalue);
+
+
+/**
+ * Get a Byte array from AJP Message
+ *
+ * @param msg AJP Message to get value from
+ * @param rvalue Pointer where value will be returned
+ * @param rvalue_len Pointer where Byte array len will be returned
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_get_bytes(ajp_msg_t *msg, apr_byte_t **rvalue,
+ apr_size_t *rvalue_len);
+
+/**
+ * Create an AJP Message from pool
+ *
+ * @param pool memory pool to allocate AJP message from
+ * @param size size of the buffer to create
+ * @param rmsg Pointer to newly created AJP message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_create(apr_pool_t *pool, apr_size_t size, ajp_msg_t **rmsg);
+
+/**
+ * Recopy an AJP Message to another
+ *
+ * @param smsg source AJP message
+ * @param dmsg destination AJP message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_copy(ajp_msg_t *smsg, ajp_msg_t *dmsg);
+
+/**
+ * Serialize in an AJP Message a PING command
+ *
+ * +-----------------------+
+ * | PING CMD (1 byte) |
+ * +-----------------------+
+ *
+ * @param msg AJP message to put serialized message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_serialize_ping(ajp_msg_t *msg);
+
+/**
+ * Serialize in an AJP Message a CPING command
+ *
+ * +-----------------------+
+ * | CPING CMD (1 byte) |
+ * +-----------------------+
+ *
+ * @param msg AJP message to put serialized message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_serialize_cping(ajp_msg_t *msg);
+
+/**
+ * Dump up to the first 1024 bytes on an AJP Message
+ *
+ * @param pool pool to allocate from
+ * @param msg AJP Message to dump
+ * @param err error string to display
+ * @param count the number of bytes to dump
+ * @param buf buffer pointer for dump message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_dump(apr_pool_t *pool, ajp_msg_t *msg, char *err,
+ apr_size_t count, char **buf);
+
+/**
+ * Log an AJP message
+ *
+ * @param r The current request
+ * @param msg AJP Message to dump
+ * @param err error string to display
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_msg_log(request_rec *r, ajp_msg_t *msg, char *err);
+
+/**
+ * Send an AJP message to backend
+ *
+ * @param sock backend socket
+ * @param msg AJP message to put serialized message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_ilink_send(apr_socket_t *sock, ajp_msg_t *msg);
+
+/**
+ * Receive an AJP message from backend
+ *
+ * @param sock backend socket
+ * @param msg AJP message to put serialized message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_ilink_receive(apr_socket_t *sock, ajp_msg_t *msg);
+
+/**
+ * Build the ajp header message and send it
+ * @param sock backend socket
+ * @param r current request
+ * @param buffsize max size of the AJP packet.
+ * @param uri requested uri
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_send_header(apr_socket_t *sock, request_rec *r,
+ apr_size_t buffsize,
+ apr_uri_t *uri);
+
+/**
+ * Read the ajp message and return the type of the message.
+ * @param sock backend socket
+ * @param r current request
+ * @param buffsize size of the buffer.
+ * @param msg returned AJP message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_read_header(apr_socket_t *sock,
+ request_rec *r,
+ apr_size_t buffsize,
+ ajp_msg_t **msg);
+
+/**
+ * Allocate a msg to send data
+ * @param pool pool to allocate from
+ * @param ptr data buffer
+ * @param len the length of allocated data buffer
+ * @param msg returned AJP message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_alloc_data_msg(apr_pool_t *pool, char **ptr,
+ apr_size_t *len, ajp_msg_t **msg);
+
+/**
+ * Send the data message
+ * @param sock backend socket
+ * @param msg AJP message to send
+ * @param len AJP message length
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_send_data_msg(apr_socket_t *sock,
+ ajp_msg_t *msg, apr_size_t len);
+
+/**
+ * Parse the message type
+ * @param r current request
+ * @param msg AJP message
+ * @return AJP message type.
+ */
+int ajp_parse_type(request_rec *r, ajp_msg_t *msg);
+
+/**
+ * Parse the header message from container
+ * @param r current request
+ * @param conf proxy config
+ * @param msg AJP message
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_parse_header(request_rec *r, proxy_dir_conf *conf,
+ ajp_msg_t *msg);
+
+/**
+ * Parse the message body and return data address and length
+ * @param r current request
+ * @param msg AJP message
+ * @param len returned AJP message length
+ * @param ptr returned data
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_parse_data(request_rec *r, ajp_msg_t *msg,
+ apr_uint16_t *len, char **ptr);
+
+
+/**
+ * Check the reuse flag in CMD_AJP13_END_RESPONSE
+ * @param r current request
+ * @param msg AJP message
+ * @param reuse returned reuse flag
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_parse_reuse(request_rec *r, ajp_msg_t *msg,
+ apr_byte_t *reuse);
+
+
+/**
+ * Handle the CPING/CPONG messages
+ * @param sock backend socket
+ * @param r current request
+ * @param timeout time window for receiving cpong reply
+ * @return APR_SUCCESS or error
+ */
+apr_status_t ajp_handle_cping_cpong(apr_socket_t *sock,
+ request_rec *r,
+ apr_interval_time_t timeout);
+
+
+/**
+ * Convert numeric message type into string
+ * @param type AJP message type
+ * @return AJP message type as a string
+ */
+const char *ajp_type_str(int type);
+
+/** @} */
+
+#endif /* AJP_H */
+
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