Getting Xerces to parse an xml with entity callouts specifying a URL and
requiring Xerces to use a specific proxyhost using the curl library to setup
the proxyhost resulted in a core dump. I've read the documentation for both
curl lib and Xerces on how to enable the netaccessor and set the proxy host.
The bus error was generated in
xercesc/util/NetAccessors/Socket/UnixHTTPURLInputStream.cpp. I've listed the
steps of what was done below:
I've must have incorrectly configured or built the library or I'm missing a
step. Is there a way to confirm what netaccessor the built library is using?
What other info can I provide to help in resolving this matter?
Thanks for all your support
1) configure Xerces with the following options
======================================================
./configure --prefix=/site/sw/ots/xerces/xerces-c-3.0.1
--exec-prefix=/site/ots/xerces/xerces-c-3.0.1 CXX=/opt/aCC/bin/aCC
CXXFLAGS="-Aa -mt -g" CPPFLAGS="-I/site/sw/ots/curl/curl-7.19.6/include"
--enable-netaccessor-curl --with-curl=/site/sw/ots/curl/curl-7.19.6
2) config.log confirmed Xerces was configured to use netaccessor curl
======================================================
configure:26068: checking for libcurl
configure:26086: result: /site/sw/ots/curl/curl-7.19.6
configure:26102: checking whether we can support the libcurl-based NetAccessor
configure:26121: result: yes
configure:26130: checking whether we can support the sockets-based NetAccessor
configure:26148: result: yes
configure:26548: checking for which NetAccessor to use (choices: -CURL-
-socket-)
configure:26628: result: curl
...
configure:29833: Report:
configure:29835: File Manager: POSIX
configure:29837: Mutex Manager: POSIX
configure:29839: Transcoder: iconv
configure:29841: NetAccessor: curl
configure:29843: Message Loader: inmemory
3)built and installed Xerces
4)Used curl lib to setup the proxyhost:
======================================================
curl_global_init(CURL_GLOBAL_ALL);
_cURLHandle = curl_easy_init();
curl_easy_setopt(_cURLHandle, CURLOPT_PROXY, proxyHostPort);
5) set the env var http_proxy to the proxy host
6) invoked Xerces parse method and the program terminated with a Bus error
======================================================
_XmlDOMParser->setValidationScheme(_XmlDOMParser->Val_Always);
_XmlDOMParser->setDoSchema(false);
resetErrorHandler();
_XmlDOMParser->parse(xmlDoc);
Program terminated with signal 10, Bus error.
warning: The shared libraries were not privately mapped; setting a
breakpoint in a shared library will not work until you rerun the program.
#1 0xc9e0fe74 in xercesc_3_0::SocketNetAccessor::makeNew (this=0x4001eb40,
urlsour...@0x400401f8, httpInfo=0x0) at ./xercesc/util/XMemory.hpp:107
#2 0xc9b9c768 in xercesc_3_0::XMLURL::makeNewStream (this=0x400401f8) at
xercesc/util/XMLURL.cpp:660
#3 0xc9c3b980 in xercesc_3_0::URLInputSource::makeStream (this=0x400401e0) at
xercesc/framework/URLInputSource.cpp:96
#4 0xc9c866f0 in xercesc_3_0::ReaderMgr::createReader (this=0x400a11fc,
s...@0x400401e0, No.Identifier=false, refFrom=RefFrom_NonLiteral, type=Type_PE,
source=Source_External, calcSrcOfs=false) at xercesc/internal/ReaderMgr.cpp:365
#5 0xc9c87f40 in xercesc_3_0::ReaderMgr::createReader (this=0x400a11fc,
baseURI=0x40057c98, sysId=0x4001f5e8, pubId=0x4001f578, xmlDecl=false,
refFrom=RefFrom_NonLiteral, type=Type_PE, source=Source_External,
srctofi...@0x6fff62b8, calcSrcOfs=false, disableDefaultEntityResolution=false)
at xercesc/internal/ReaderMgr.cpp:684
#6 0xc9d6eaac in xercesc_3_0::DTDScanner::expandPERef (this=0x6fff6030,
scanExternal=true, inLiteral=false, inMarkup=false, throwEndOfExt=true) at
xercesc/validators/DTD/DTDScanner.cpp:259
#7 0xc9d77f60 in xercesc_3_0::DTDScanner::scanInternalSubset (this=0x6fff6030)
at xercesc/validators/DTD/DTDScanner.cpp:2937
#8 0xc9c6c8a0 in xercesc_3_0::IGXMLScanner::scanDocTypeDecl (this=0x400a1178)
at xercesc/internal/IGXMLScanner.cpp:1410
#9 0xc9cba61c in xercesc_3_0::XMLScanner::scanProlog (this=0x400a1178) at
xercesc/internal/XMLScanner.cpp:1268
#10 0xc9c65ebc in xercesc_3_0::IGXMLScanner::scanDocument (this=0x400a1178,
s...@0x400eced8) at xercesc/internal/IGXMLScanner.cpp:205
#11 0xc9cb6e2c in xercesc_3_0::XMLScanner::scanDocument (this=0x400a1178,
systemId=0x40040178) at xercesc/internal/XMLScanner.cpp:395
#12 0xc9cb6ed4 in xercesc_3_0::XMLScanner::scanDocument (this=0x400a1178,
systemId=0x4001c8c8 "777_d622w001xmlsupjw_20090905_mpdsup.xml") at
xercesc/internal/XMLScanner.cpp:403
#13 0xc9cfa774 in xercesc_3_0::AbstractDOMParser::parse (this=0x4004ffd0,
systemId=0x4001c8c8 "777_d622w001xmlsupjw_20090905_mpdsup.xml") at
xercesc/parsers/AbstractDOMParser.cpp:591
-----Original Message-----
From: David Bertoni [mailto:[email protected]]
Sent: Friday, November 06, 2009 11:27 AM
To: [email protected]
Subject: Re: What is the difference between configuring Xerces 3.0.1
with--enable-netaccessor-curlvs--enable-netaccessor-socket?
Vitaly Prapirny wrote:
> Dantzler, DeWayne C wrote:
>> my assumption is that somehow Xerces must use it. Given Alberto
>> comments "If you use --enable-netaccessor-curl Xerces will use the
>> APIs provided by libcurl, so if you use the same API to setup a
>> global proxy
>
> Xerces does nothing with the proxy settings. What Alberto means is
> that you should use the *libcurl* API to setup a global proxy. Simply
> use any of the libcurl abilities to specify proxy settings, not the
> Xerces API.
>
> Seems that my english is not perfect enough :)
Some of the confusion is that Xerces-C doesn't provide access to the libcurl
handle that you need to set values using the API. Instead, you need to set the
environment variable described in the documentation.
Dave
