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freeswitch/libs/xmlrpc-c/src/xmlrpc_server_cgi.c

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/* Copyright (C) 2001 by Eric Kidd. All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE. */
#include "xmlrpc_config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* Windows NT stdout binary mode fix. */
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#endif
#include "xmlrpc-c/base.h"
#include "xmlrpc-c/server.h"
#include "xmlrpc-c/string_int.h"
#include "xmlrpc-c/server_cgi.h"
/*=========================================================================
** Output Routines
**=========================================================================
** These routines send various kinds of responses to the server.
*/
static void
send_xml(const char * const xml_data,
size_t const xml_len) {
#ifdef _WIN32
_setmode(_fileno(stdout), _O_BINARY);
#endif
/* Send our CGI headers back to the server.
** XXX - Coercing 'size_t' to 'unsigned long' might be unsafe under
** really weird circumstances. */
fprintf(stdout, "Status: 200 OK\n");
/* Handle authentication cookie being sent back. */
if (getenv("HTTP_COOKIE_AUTH") != NULL)
fprintf(stdout, "Set-Cookie: auth=%s\n", getenv("HTTP_COOKIE_AUTH"));
fprintf(stdout, "Content-type: text/xml; charset=\"utf-8\"\n");
fprintf(stdout, "Content-length: %ld\n\n", (unsigned long) xml_len);
/* Blast out our data. */
fwrite(xml_data, sizeof(char), xml_len, stdout);
}
static void
send_error(int const code,
const char * const message,
xmlrpc_env * const env) {
#ifdef _WIN32
_setmode(_fileno(stdout), _O_BINARY);
#endif
/* Send an error header. */
fprintf(stdout, "Status: %d %s\n", code, message);
fprintf(stdout, "Content-type: text/html\n\n");
/* Send an error message. */
fprintf(stdout, "<title>%d %s</title>\n", code, message);
fprintf(stdout, "<h1>%d %s</h1>\n", code, message);
fprintf(stdout, "<p>An error occurred processing your request.</p>\n");
/* Print out the XML-RPC fault, if present. */
if (env && env->fault_occurred)
fprintf(stdout, "<p>XML-RPC Fault #%d: %s</p>\n",
env->fault_code, env->fault_string);
}
/*=========================================================================
** die_if_fault_occurred
**=========================================================================
** Certain kinds of errors aren't worth the trouble of generating
** an XML-RPC fault. For these, we just send status 500 to our web server
** and log the fault to our server log.
*/
static void
die_if_fault_occurred(xmlrpc_env * const env) {
if (env->fault_occurred) {
fprintf(stderr, "Unexpected XML-RPC fault: %s (%d)\n",
env->fault_string, env->fault_code);
send_error(500, "Internal Server Error", env);
exit(1);
}
}
/*=========================================================================
** Initialization, Cleanup & Method Registry
**=========================================================================
** These are all related, so we group them together.
*/
static xmlrpc_registry * globalRegistryP;
/*=========================================================================
** get_body
**=========================================================================
** Slurp the body of the request into an xmlrpc_mem_block.
*/
static xmlrpc_mem_block *
get_body(xmlrpc_env * const env,
size_t const length) {
xmlrpc_mem_block *result;
char *contents;
size_t count;
XMLRPC_ASSERT_ENV_OK(env);
/* Error-handling preconditions. */
result = NULL;
#ifdef _WIN32
/* Fix from Jeff Stewart: NT opens stdin and stdout in text mode
by default, badly confusing our length calculations. So we need
to set the file handle to binary.
*/
_setmode(_fileno(stdin), _O_BINARY);
#endif
/* XXX - Puke if length is too big. */
/* Allocate our memory block. */
result = xmlrpc_mem_block_new(env, length);
XMLRPC_FAIL_IF_FAULT(env);
contents = XMLRPC_TYPED_MEM_BLOCK_CONTENTS(char, result);
/* Get our data off the network.
** XXX - Coercing 'size_t' to 'unsigned long' might be unsafe under
** really weird circumstances. */
count = fread(contents, sizeof(char), length, stdin);
if (count < length)
XMLRPC_FAIL2(env, XMLRPC_INTERNAL_ERROR,
"Expected %ld bytes, received %ld",
(unsigned long) length, (unsigned long) count);
cleanup:
if (env->fault_occurred) {
if (result)
xmlrpc_mem_block_free(result);
return NULL;
}
return result;
}
void
xmlrpc_server_cgi_process_call(xmlrpc_registry * const registryP) {
/*----------------------------------------------------------------------------
Get the XML-RPC call from Standard Input and environment variables,
parse it, find the right method, call it, prepare an XML-RPC
response with the result, and write it to Standard Output.
-----------------------------------------------------------------------------*/
xmlrpc_env env;
char *method, *type, *length_str;
int length;
xmlrpc_mem_block *input, *output;
char *input_data, *output_data;
size_t input_size, output_size;
int code;
char *message;
/* Error-handling preconditions. */
xmlrpc_env_init(&env);
input = output = NULL;
/* Set up a default error message. */
code = 500; message = "Internal Server Error";
/* Get our HTTP information from the environment. */
method = getenv("REQUEST_METHOD");
type = getenv("CONTENT_TYPE");
length_str = getenv("CONTENT_LENGTH");
/* Perform some sanity checks. */
if (!method || !xmlrpc_streq(method, "POST")) {
code = 405; message = "Method Not Allowed";
XMLRPC_FAIL(&env, XMLRPC_INTERNAL_ERROR, "Expected HTTP method POST");
}
if (!type || !xmlrpc_strneq(type, "text/xml", strlen("text/xml"))) {
char *template = "Expected content type: \"text/xml\", received: \"%s\"";
size_t err_len = strlen(template) + strlen(type) + 1;
char *err = malloc(err_len);
(void)snprintf(err, err_len, template, type);
code = 400; message = "Bad Request";
XMLRPC_FAIL(&env, XMLRPC_INTERNAL_ERROR, err);
free(err);
}
if (!length_str) {
code = 411; message = "Length Required";
XMLRPC_FAIL(&env, XMLRPC_INTERNAL_ERROR, "Content-length required");
}
/* Get our content length. */
length = atoi(length_str);
if (length <= 0) {
code = 400; message = "Bad Request";
XMLRPC_FAIL(&env, XMLRPC_INTERNAL_ERROR, "Content-length must be > 0");
}
/* SECURITY: Make sure our content length is legal.
** XXX - We can cast 'input_len' because we know it's >= 0, yes? */
if ((size_t) length > xmlrpc_limit_get(XMLRPC_XML_SIZE_LIMIT_ID)) {
code = 400; message = "Bad Request";
XMLRPC_FAIL(&env, XMLRPC_LIMIT_EXCEEDED_ERROR,
"XML-RPC request too large");
}
/* Get our body. */
input = get_body(&env, length);
XMLRPC_FAIL_IF_FAULT(&env);
input_data = XMLRPC_TYPED_MEM_BLOCK_CONTENTS(char, input);
input_size = XMLRPC_TYPED_MEM_BLOCK_SIZE(char, input);
/* Process our call. */
xmlrpc_registry_process_call2(&env, registryP,
input_data, input_size, NULL, &output);
XMLRPC_FAIL_IF_FAULT(&env);
output_data = XMLRPC_TYPED_MEM_BLOCK_CONTENTS(char, output);
output_size = XMLRPC_TYPED_MEM_BLOCK_SIZE(char, output);
/* Send our data. */
send_xml(output_data, output_size);
cleanup:
if (input)
xmlrpc_mem_block_free(input);
if (output)
xmlrpc_mem_block_free(output);
if (env.fault_occurred)
send_error(code, message, &env);
xmlrpc_env_clean(&env);
}
void
xmlrpc_cgi_init(int const flags ATTR_UNUSED) {
xmlrpc_env env;
xmlrpc_env_init(&env);
globalRegistryP = xmlrpc_registry_new(&env);
die_if_fault_occurred(&env);
xmlrpc_env_clean(&env);
}
void
xmlrpc_cgi_cleanup(void) {
xmlrpc_registry_free(globalRegistryP);
}
xmlrpc_registry *
xmlrpc_cgi_registry(void) {
return globalRegistryP;
}
void
xmlrpc_cgi_add_method(const char * const method_name,
xmlrpc_method const method,
void * const user_data) {
xmlrpc_env env;
xmlrpc_env_init(&env);
xmlrpc_registry_add_method(&env, globalRegistryP, NULL, method_name,
method, user_data);
die_if_fault_occurred(&env);
xmlrpc_env_clean(&env);
}
void
xmlrpc_cgi_add_method_w_doc(const char * const method_name,
xmlrpc_method const method,
void * const user_data,
const char * const signature,
const char * const help) {
xmlrpc_env env;
xmlrpc_env_init(&env);
xmlrpc_registry_add_method_w_doc(&env, globalRegistryP, NULL, method_name,
method, user_data, signature, help);
die_if_fault_occurred(&env);
xmlrpc_env_clean(&env);
}
void
xmlrpc_cgi_process_call(void) {
xmlrpc_server_cgi_process_call(globalRegistryP);
}
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