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

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/* Copyright information is at end of file. */
#define _XOPEN_SOURCE 600 /* Make sure strdup() is in <string.h> */
#include "xmlrpc_config.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#include "bool.h"
#include "xmlrpc-c/base.h"
#include "xmlrpc-c/base_int.h"
#include "xmlrpc-c/string_int.h"
#include "xmlrpc-c/util.h"
#include "xmlrpc-c/xmlparser.h"
#include "parse_value.h"
/* Notes about XML-RPC XML documents:
Contain CDATA: methodName, i4, int, boolean, string, double,
dateTime.iso8601, base64, name
We attempt to validate the structure of the XML document carefully.
We also try *very* hard to handle malicious data gracefully, and without
leaking memory.
The CHECK_NAME and CHECK_CHILD_COUNT macros examine an XML element, and
invoke XMLRPC_FAIL if something looks wrong.
*/
static void
setParseFault(xmlrpc_env * const envP,
const char * const format,
...) {
va_list args;
va_start(args, format);
xmlrpc_set_fault_formatted_v(envP, XMLRPC_PARSE_ERROR, format, args);
va_end(args);
}
#define CHECK_NAME(env,elem,name) \
do \
if (!xmlrpc_streq((name), xml_element_name(elem))) \
XMLRPC_FAIL2(env, XMLRPC_PARSE_ERROR, \
"Expected element of type <%s>, found <%s>", \
(name), xml_element_name(elem)); \
while (0)
#define CHECK_CHILD_COUNT(env,elem,count) \
do \
if (xml_element_children_size(elem) != (count)) \
XMLRPC_FAIL3(env, XMLRPC_PARSE_ERROR, \
"Expected <%s> to have %u children, found %u", \
xml_element_name(elem), (count), \
(unsigned)xml_element_children_size(elem)); \
while (0)
static xml_element *
getChildByName (xmlrpc_env * const envP,
xml_element * const parentP,
const char * const name) {
size_t const childCount = xml_element_children_size(parentP);
xml_element ** const childrenP = xml_element_children(parentP);
unsigned int i;
for (i = 0; i < childCount; ++i) {
if (xmlrpc_streq(xml_element_name(childrenP[i]), name))
return childrenP[i];
}
setParseFault(envP, "Expected <%s> to have child <%s>",
xml_element_name(parentP), name);
return NULL;
}
/*=========================================================================
** convert_params
**=========================================================================
** Convert an XML element representing a list of params into an
** xmlrpc_value (of type array).
*/
static xmlrpc_value *
convert_params(xmlrpc_env * const envP,
const xml_element * const elemP) {
/*----------------------------------------------------------------------------
Convert an XML element representing a list of parameters (i.e. a <params>
element) to an xmlrpc_value of type array. Note that an xmlrpc_value is
normally represented in XML by a <value> element, not a <params> element.
We use type xmlrpc_value to represent the parameter list just for
convenience.
-----------------------------------------------------------------------------*/
xmlrpc_value *array, *item;
int size, i;
xml_element **params, *param, *value;
XMLRPC_ASSERT_ENV_OK(envP);
XMLRPC_ASSERT(elemP != NULL);
/* Set up our error-handling preconditions. */
array = item = NULL;
/* Allocate an array to hold our parameters. */
array = xmlrpc_build_value(envP, "()");
XMLRPC_FAIL_IF_FAULT(envP);
/* We're responsible for checking our own element name. */
CHECK_NAME(envP, elemP, "params");
/* Iterate over our children. */
size = xml_element_children_size(elemP);
params = xml_element_children(elemP);
for (i = 0; i < size; ++i) {
unsigned int const maxNest = (unsigned int)
xmlrpc_limit_get(XMLRPC_NESTING_LIMIT_ID);
param = params[i];
CHECK_NAME(envP, param, "param");
CHECK_CHILD_COUNT(envP, param, 1);
value = xml_element_children(param)[0];
CHECK_NAME(envP, value, "value");
xmlrpc_parseValue(envP, maxNest, value, &item);
XMLRPC_FAIL_IF_FAULT(envP);
xmlrpc_array_append_item(envP, array, item);
xmlrpc_DECREF(item);
item = NULL;
XMLRPC_FAIL_IF_FAULT(envP);
}
cleanup:
if (envP->fault_occurred) {
if (array)
xmlrpc_DECREF(array);
if (item)
xmlrpc_DECREF(item);
return NULL;
}
return array;
}
static void
parseCallXml(xmlrpc_env * const envP,
const char * const xmlData,
size_t const xmlDataLen,
xml_element ** const callElemPP) {
/*----------------------------------------------------------------------------
Parse the XML of an XML-RPC call.
-----------------------------------------------------------------------------*/
xml_element * callElemP;
xmlrpc_env env;
xmlrpc_env_init(&env);
xml_parse(&env, xmlData, xmlDataLen, &callElemP);
if (env.fault_occurred)
xmlrpc_env_set_fault_formatted(
envP, env.fault_code, "Call is not valid XML. %s",
env.fault_string);
else {
if (!xmlrpc_streq(xml_element_name(callElemP), "methodCall"))
setParseFault(envP,
"XML-RPC call should be a <methodCall> element. "
"Instead, we have a <%s> element.",
xml_element_name(callElemP));
if (envP->fault_occurred)
xml_element_free(callElemP);
}
*callElemPP = callElemP;
xmlrpc_env_clean(&env);
}
static void
parseMethodNameElement(xmlrpc_env * const envP,
xml_element * const nameElemP,
const char ** const methodNameP) {
XMLRPC_ASSERT(xmlrpc_streq(xml_element_name(nameElemP), "methodName"));
if (xml_element_children_size(nameElemP) > 0)
setParseFault(envP, "A <methodName> element should not have "
"children. This one has %u of them.",
xml_element_children_size(nameElemP));
else {
const char * const cdata = xml_element_cdata(nameElemP);
xmlrpc_validate_utf8(envP, cdata, strlen(cdata));
if (!envP->fault_occurred) {
*methodNameP = strdup(cdata);
if (*methodNameP == NULL)
xmlrpc_faultf(envP,
"Could not allocate memory for method name");
}
}
}
static void
parseCallChildren(xmlrpc_env * const envP,
xml_element * const callElemP,
const char ** const methodNameP,
xmlrpc_value ** const paramArrayPP ) {
/*----------------------------------------------------------------------------
Parse the children of a <methodCall> XML element *callElemP. They should
be <methodName> and <params>.
-----------------------------------------------------------------------------*/
size_t const callChildCount = xml_element_children_size(callElemP);
xml_element * nameElemP;
XMLRPC_ASSERT(xmlrpc_streq(xml_element_name(callElemP), "methodCall"));
nameElemP = getChildByName(envP, callElemP, "methodName");
if (!envP->fault_occurred) {
parseMethodNameElement(envP, nameElemP, methodNameP);
if (!envP->fault_occurred) {
/* Convert our parameters. */
if (callChildCount > 1) {
xml_element * paramsElemP;
paramsElemP = getChildByName(envP, callElemP, "params");
if (!envP->fault_occurred)
*paramArrayPP = convert_params(envP, paramsElemP);
} else {
/* Workaround for Ruby XML-RPC and old versions of
xmlrpc-epi. Future improvement: Instead of looking
at child count, we should just check for existence
of <params>.
*/
*paramArrayPP = xmlrpc_array_new(envP);
}
if (!envP->fault_occurred) {
if (callChildCount > 2)
setParseFault(envP, "<methodCall> has extraneous "
"children, other than <methodName> and "
"<params>. Total child count = %u",
callChildCount);
if (envP->fault_occurred)
xmlrpc_DECREF(*paramArrayPP);
}
if (envP->fault_occurred)
xmlrpc_strfree(*methodNameP);
}
}
}
void
xmlrpc_parse_call(xmlrpc_env * const envP,
const char * const xmlData,
size_t const xmlDataLen,
const char ** const methodNameP,
xmlrpc_value ** const paramArrayPP) {
/*----------------------------------------------------------------------------
Given some XML text, attempt to parse it as an XML-RPC call.
Return as *methodNameP the name of the method identified in the call
and as *paramArrayPP the parameter list as an XML-RPC array.
Caller must free() and xmlrpc_DECREF() these, respectively).
-----------------------------------------------------------------------------*/
XMLRPC_ASSERT_ENV_OK(envP);
XMLRPC_ASSERT(xmlData != NULL);
XMLRPC_ASSERT(methodNameP != NULL && paramArrayPP != NULL);
/* SECURITY: Last-ditch attempt to make sure our content length is
legal. XXX - This check occurs too late to prevent an attacker
from creating an enormous memory block, so you should try to
enforce it *before* reading any data off the network.
*/
if (xmlDataLen > xmlrpc_limit_get(XMLRPC_XML_SIZE_LIMIT_ID))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_LIMIT_EXCEEDED_ERROR,
"XML-RPC request too large. Max allowed is %u bytes",
(unsigned)xmlrpc_limit_get(XMLRPC_XML_SIZE_LIMIT_ID));
else {
xml_element * callElemP;
parseCallXml(envP, xmlData, xmlDataLen, &callElemP);
if (!envP->fault_occurred) {
parseCallChildren(envP, callElemP, methodNameP, paramArrayPP);
xml_element_free(callElemP);
}
}
if (envP->fault_occurred) {
/* Should not be necessary, but for backward compatibility: */
*methodNameP = NULL;
*paramArrayPP = NULL;
}
}
static void
interpretFaultCode(xmlrpc_env * const envP,
xmlrpc_value * const faultCodeVP,
int * const faultCodeP) {
xmlrpc_env fcEnv;
xmlrpc_env_init(&fcEnv);
xmlrpc_read_int(&fcEnv, faultCodeVP, faultCodeP);
if (fcEnv.fault_occurred)
xmlrpc_faultf(envP, "Invalid value for 'faultCode' member. %s",
fcEnv.fault_string);
xmlrpc_env_clean(&fcEnv);
}
static void
interpretFaultString(xmlrpc_env * const envP,
xmlrpc_value * const faultStringVP,
const char ** const faultStringP) {
xmlrpc_env fsEnv;
xmlrpc_env_init(&fsEnv);
xmlrpc_read_string(&fsEnv, faultStringVP, faultStringP);
if (fsEnv.fault_occurred)
xmlrpc_faultf(envP, "Invalid value for 'faultString' member. %s",
fsEnv.fault_string);
xmlrpc_env_clean(&fsEnv);
}
static void
interpretFaultValue(xmlrpc_env * const envP,
xmlrpc_value * const faultVP,
int * const faultCodeP,
const char ** const faultStringP) {
if (faultVP->_type != XMLRPC_TYPE_STRUCT)
setParseFault(envP,
"<value> element of <fault> response is not "
"of structure type");
else {
xmlrpc_value * faultCodeVP;
xmlrpc_env fvEnv;
xmlrpc_env_init(&fvEnv);
xmlrpc_struct_read_value(&fvEnv, faultVP, "faultCode", &faultCodeVP);
if (!fvEnv.fault_occurred) {
interpretFaultCode(&fvEnv, faultCodeVP, faultCodeP);
if (!fvEnv.fault_occurred) {
xmlrpc_value * faultStringVP;
xmlrpc_struct_read_value(&fvEnv, faultVP, "faultString",
&faultStringVP);
if (!fvEnv.fault_occurred) {
interpretFaultString(&fvEnv, faultStringVP, faultStringP);
xmlrpc_DECREF(faultStringVP);
}
}
xmlrpc_DECREF(faultCodeVP);
}
if (fvEnv.fault_occurred)
setParseFault(envP, "Invalid struct for <fault> value. %s",
fvEnv.fault_string);
xmlrpc_env_clean(&fvEnv);
}
}
static void
parseFaultElement(xmlrpc_env * const envP,
const xml_element * const faultElement,
int * const faultCodeP,
const char ** const faultStringP) {
unsigned int const maxRecursion = (unsigned int)
xmlrpc_limit_get(XMLRPC_NESTING_LIMIT_ID);
XMLRPC_ASSERT(xmlrpc_streq(xml_element_name(faultElement), "fault"));
if (xml_element_children_size(faultElement) != 1)
setParseFault(envP, "<fault> element should have 1 child, "
"but it has %u.",
xml_element_children_size(faultElement));
else {
xml_element * const faultValueP =
xml_element_children(faultElement)[0];
const char * const elemName = xml_element_name(faultValueP);
if (!xmlrpc_streq(elemName, "value"))
setParseFault(envP,
"<fault> contains a <%s> element. "
"Only <value> makes sense.",
elemName);
else {
xmlrpc_value * faultVP;
xmlrpc_parseValue(envP, maxRecursion, faultValueP, &faultVP);
if (!envP->fault_occurred) {
interpretFaultValue(envP, faultVP, faultCodeP, faultStringP);
xmlrpc_DECREF(faultVP);
}
}
}
}
static void
parseParamsElement(xmlrpc_env * const envP,
const xml_element * const paramsElementP,
xmlrpc_value ** const resultPP) {
xmlrpc_value * paramsVP;
xmlrpc_env env;
xmlrpc_env_init(&env);
XMLRPC_ASSERT(xmlrpc_streq(xml_element_name(paramsElementP), "params"));
paramsVP = convert_params(envP, paramsElementP);
if (!envP->fault_occurred) {
int arraySize;
xmlrpc_env sizeEnv;
XMLRPC_ASSERT_ARRAY_OK(paramsVP);
xmlrpc_env_init(&sizeEnv);
arraySize = xmlrpc_array_size(&sizeEnv, paramsVP);
/* Since it's a valid array, as asserted above, can't fail */
XMLRPC_ASSERT(!sizeEnv.fault_occurred);
if (arraySize != 1)
setParseFault(envP, "Contains %d items. It should have 1.",
arraySize);
else {
xmlrpc_array_read_item(envP, paramsVP, 0, resultPP);
}
xmlrpc_DECREF(paramsVP);
xmlrpc_env_clean(&sizeEnv);
}
if (env.fault_occurred)
xmlrpc_env_set_fault_formatted(
envP, env.fault_code,
"Invalid <params> element. %s", env.fault_string);
xmlrpc_env_clean(&env);
}
static void
parseMethodResponseElt(xmlrpc_env * const envP,
const xml_element * const methodResponseEltP,
xmlrpc_value ** const resultPP,
int * const faultCodeP,
const char ** const faultStringP) {
XMLRPC_ASSERT(xmlrpc_streq(xml_element_name(methodResponseEltP),
"methodResponse"));
if (xml_element_children_size(methodResponseEltP) == 1) {
xml_element * const child =
xml_element_children(methodResponseEltP)[0];
if (xmlrpc_streq(xml_element_name(child), "params")) {
/* It's a successful response */
parseParamsElement(envP, child, resultPP);
*faultStringP = NULL;
} else if (xmlrpc_streq(xml_element_name(child), "fault")) {
/* It's a failure response */
parseFaultElement(envP, child, faultCodeP, faultStringP);
} else
setParseFault(envP,
"<methodResponse> must contain <params> or <fault>, "
"but contains <%s>.", xml_element_name(child));
} else
setParseFault(envP,
"<methodResponse> has %u children, should have 1.",
xml_element_children_size(methodResponseEltP));
}
void
xmlrpc_parse_response2(xmlrpc_env * const envP,
const char * const xmlData,
size_t const xmlDataLen,
xmlrpc_value ** const resultPP,
int * const faultCodeP,
const char ** const faultStringP) {
/*----------------------------------------------------------------------------
Given some XML text, attempt to parse it as an XML-RPC response.
If the response is a regular, valid response, return a new reference
to the appropriate value as *resultP and return NULL as
*faultStringP and nothing as *faultCodeP.
If the response is valid, but indicates a failure of the RPC, return the
fault string in newly malloc'ed space as *faultStringP and the fault
code as *faultCodeP and nothing as *resultP.
If the XML text is not a valid response or something prevents us from
parsing it, return a description of the error as *envP and nothing else.
-----------------------------------------------------------------------------*/
xml_element * responseEltP;
XMLRPC_ASSERT_ENV_OK(envP);
XMLRPC_ASSERT(xmlData != NULL);
/* SECURITY: Last-ditch attempt to make sure our content length is legal.
** XXX - This check occurs too late to prevent an attacker from creating
** an enormous memory block, so you should try to enforce it
** *before* reading any data off the network. */
if (xmlDataLen > xmlrpc_limit_get(XMLRPC_XML_SIZE_LIMIT_ID))
xmlrpc_env_set_fault_formatted(
envP, XMLRPC_LIMIT_EXCEEDED_ERROR,
"XML-RPC response too large. Our limit is %u characters. "
"We got %u characters",
(unsigned)xmlrpc_limit_get(XMLRPC_XML_SIZE_LIMIT_ID),
(unsigned)xmlDataLen);
else {
xmlrpc_env env;
xmlrpc_env_init(&env);
xml_parse(&env, xmlData, xmlDataLen, &responseEltP);
if (env.fault_occurred)
setParseFault(envP, "Not valid XML. %s", env.fault_string);
else {
/* Pick apart and verify our structure. */
if (xmlrpc_streq(xml_element_name(responseEltP),
"methodResponse")) {
parseMethodResponseElt(envP, responseEltP,
resultPP, faultCodeP, faultStringP);
} else
setParseFault(envP, "XML-RPC response must consist of a "
"<methodResponse> element. "
"This has a <%s> instead.",
xml_element_name(responseEltP));
xml_element_free(responseEltP);
}
xmlrpc_env_clean(&env);
}
}
xmlrpc_value *
xmlrpc_parse_response(xmlrpc_env * const envP,
const char * const xmlData,
size_t const xmlDataLen) {
/*----------------------------------------------------------------------------
This exists for backward compatibility. It is like
xmlrpc_parse_response2(), except that it merges the concepts of a
failed RPC and an error in executing the RPC.
-----------------------------------------------------------------------------*/
xmlrpc_value * retval;
xmlrpc_value * result;
const char * faultString;
int faultCode;
xmlrpc_parse_response2(envP, xmlData, xmlDataLen,
&result, &faultCode, &faultString);
if (envP->fault_occurred)
retval = NULL;
else {
if (faultString) {
xmlrpc_env_set_fault(envP, faultCode, faultString);
xmlrpc_strfree(faultString);
retval = NULL;
} else
retval = result; /* transfer reference */
}
return retval;
}
void
xmlrpc_parse_value_xml(xmlrpc_env * const envP,
const char * const xmlData,
size_t const xmlDataLen,
xmlrpc_value ** const valuePP) {
/*----------------------------------------------------------------------------
Compute the xmlrpc_value represented by the XML document 'xmlData' (of
length 'xmlDataLen' characters), which must consist of a single <value>
element. Return that xmlrpc_value.
We call convert_array() and convert_struct(), which may ultimately
call us recursively. Don't recurse any more than 'maxRecursion'
times.
This isn't generally useful in XML-RPC programs, because such programs
parse a whole XML-RPC call or response document, and never see the XML text
of just a <value> element. But a program may do some weird form of XML-RPC
processing or just borrow Xmlrpc-c's value serialization facilities for
something unrelated to XML-RPC. In any case, it makes sense to have an
inverse of xmlrpc_serialize_value2(), which generates XML text from an
xmlrpc_value.
-----------------------------------------------------------------------------*/
xmlrpc_env env;
xml_element * valueEltP;
XMLRPC_ASSERT_ENV_OK(envP);
XMLRPC_ASSERT(xmlData != NULL);
xmlrpc_env_init(&env);
xml_parse(&env, xmlData, xmlDataLen, &valueEltP);
if (env.fault_occurred) {
setParseFault(envP, "Not valid XML. %s", env.fault_string);
} else {
if (xmlrpc_streq(xml_element_name(valueEltP), "value")) {
unsigned int const maxRecursion = (unsigned int)
xmlrpc_limit_get(XMLRPC_NESTING_LIMIT_ID);
xmlrpc_parseValue(envP, maxRecursion, valueEltP, valuePP);
} else
setParseFault(envP, "XML-RPC value XML document must consist of "
"a <value> element. This has a <%s> instead.",
xml_element_name(valueEltP));
xml_element_free(valueEltP);
}
xmlrpc_env_clean(&env);
}
/* Copyright (C) 2001 by First Peer, Inc. 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. */
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