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# 1  
Old 08-16-2009
cURL and cgi
I have a CGI application done in c++ that communicates with PayPal. I've had an issue where the application dies when I try to perform a cURL operation. Upon further inspection it seems that I can run cURL examples from the command line.

Upon even further inspection it seems that I can run cURL in the CGI if I don't set the URL option. Any other option seems to be ok. Of course this fails with an error from cURL saying that the URL was not set. But at least I get to the point of an error.

If I set the URL option it either displays a blank white screen at perform, assuming I print the necessary headers, or it fails with premature end of script headers.

So I'm not a unix guru, and I'm kind of in over my head here, but it is what it is. I'm thinking maybe there's a port blocked that's used by the cgi for outgoing requests that isn't used for the command line. I'm thinking maybe it's a permissions thing. The examples were run as root, and I set the .cgi file to be owned by root, but maybe that doesn't count.

I could really use some direction here. And keep in mind my unix knowledge is not phenominal. I can get around alright, but I need a little help.

I'm running red hat and apache.

Thanks,
Brandon
# 2  
Old 08-16-2009
Could you please post your code?
# 3  
Old 08-17-2009
Code
The code is kind of a mess. A lot of things have been tried and commented out. I've tried it using cURLpp and using the standard cURL libraries. Same results.

Code:
//--------------------------------------------------------------------
// Includes
//--------------------------------------------------------------------
#include "verisign_io.h"
#include "file_io.h"
#include "error_lib.h"
#include "logging.h"
#include "toolkit.h"
#include "parm.h"

//using current time in seconds and credit card number for unique transaction id
#include <time.h>
#include <string>
#include <sstream>
#include <iostream>

//#include "curl/curl.h"
#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>
#include <curlpp/Exception.hpp>

#ifdef CGI_VERSION
        #include "cgic.h"
#endif

//*********************************************************************
// Global Functions
//*********************************************************************

//--------------------------------------------------------------------
// GetValueFromResponseString
//--------------------------------------------------------------------
bool GetValueFromResponseString (const char* key, 
                                                                TString& value, 
                                                                TString responseString)
{
        char*           startPtr        = NULL;
        char*           endPtr          = NULL;
        size_t          offset          = 0;
        size_t          length          = 0;

        value = "";

        startPtr = responseString.Find (key);
        if (startPtr)
        {
                startPtr += strlen(key);
                offset = responseString.PointerToOffset (startPtr);
                endPtr = responseString.Find ("&", true, offset);
                if (endPtr)
                        length = endPtr - startPtr;
                else
                        length = strlen(startPtr);

                value = responseString.SubString(offset,length);
        }

        return (startPtr != NULL);
}

//--------------------------------------------------------------------
// CallVerisign
//--------------------------------------------------------------------
bool CallVerisign (const TDBSplitReport* dbObjPtr,
                                         TString creditCardNumber,
                                         TString expirationDate,
                                         float amount,
                                         TString customerZipCode,
                                         TString customerAddress,
                                         TString authorizationCode,
                                         TString transactionType,
                                         TString comment,
                                         TString& answerText,
                                         TString& referenceID)
{
        bool                    success = false;
        bool                    isTest = false;
        //int                           verisignContext;
        int                             resultCode;
        TString                 localAmount;
        TString                 verisignArgs;
        TString                 responseMessage;
        //TString                       referenceID;
        TString                 tmpString;
        TString                 responseString;
        TString                 logEntry;
        //char                  *responseBuffer;

AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tAbout to setup environment");

        // Setup the environment so it can find the certificate
        setenv("PFPRO_CERT_PATH", "/usr/local/verisign/payflowpro/linux/certs", 1);

        // Nullify the answer text
        answerText = "";
        // Adjust some arguments
        creditCardNumber.NumbersOnly();
        expirationDate.NumbersOnly();
        customerZipCode.NumbersOnly();
        if (customerZipCode.IsEmpty())
                customerZipCode = "99999";
        customerZipCode = customerZipCode.SubString(0,5);
        if (comment.IsEmpty())
                comment = "---";
        comment = comment.SubString(0,18);
        localAmount.CopyFrom(amount,2);
        // convert expiration from YYYY to MMYY format
        tmpString = expirationDate;
        expirationDate = tmpString.SubString(4,2);
        expirationDate += tmpString.SubString(2,2);

        // setup the log entry
        logEntry = "Verisign Transaction\t";
        logEntry += transactionType;
        logEntry += "\t";
        logEntry += comment;
        logEntry += "\t";
        logEntry += localAmount;
        logEntry += "\t";
        tmpString = creditCardNumber.SubString(0,1);
        tmpString += "-";
        tmpString += creditCardNumber.SubString(0,4,true);
        logEntry += tmpString;
        logEntry += "\t";
        logEntry += expirationDate;
        logEntry += "\t";

AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tEntering Try");

try{
        if (strcasecmp(creditCardNumber,kTestCreditCardNumber) == 0)
        {
                isTest = true;
                //answerText = kApprovedPrefixString;
                answerText += "987654321";
        }
        else
        {
AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tNot A Test");
                // Build up the application's piped arguments
                verisignArgs += "TRXTYPE=";
                verisignArgs += transactionType;
                verisignArgs += "&TENDER=C";
                verisignArgs += "&PARTNER=";
                verisignArgs += kVerisignPartner;
                verisignArgs += "&VENDOR=";
                verisignArgs += kVerisignVendor;
                verisignArgs += "&USER=";
                verisignArgs += kVerisignUser;
                verisignArgs += "&PWD=";
                verisignArgs += kVerisignPassword;
                verisignArgs += "&ACCT=";
                verisignArgs += creditCardNumber;
                verisignArgs += "&EXPDATE=";
                verisignArgs += expirationDate;
                verisignArgs += "&AMT=";
                verisignArgs += localAmount;
                verisignArgs += "&COMMENT1[";
                verisignArgs += comment.GetLength();
                verisignArgs += "]=";
                verisignArgs += comment;
                verisignArgs += "&STREET[";
                verisignArgs += customerAddress.GetLength();
                verisignArgs += "]=";
                verisignArgs += customerAddress;
                verisignArgs += "&ZIP=";
                verisignArgs += customerZipCode;
                verisignArgs += "\r\n";
AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tArgs Set Up");

                //Using credit card number and time in seconds to create unique id
                char uniqueID[64];
                strcpy(uniqueID, creditCardNumber);
                sprintf(uniqueID, "%s%ld", uniqueID, time(NULL));
AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tBuilt Unique ID");

                //set the headers.
                std::list<std::string> headers;
                headers.push_back("Content-Type: text/namevalue");
                headers.push_back("Content-Length: " + verisignArgs.GetLength());
                headers.push_back("X-VPS-Timeout: 45");
                headers.push_back("X-VPS-Request_ID:" + std::string(uniqueID));

AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tRest Of Headers Set");

AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tInit Curl");
                cURLpp::Cleanup myCleanup;
                cURLpp::Easy myRequest;
                myRequest.setOpt(new cURLpp::Options::Url(kVerisignHost));
                myRequest.setOpt(new cURLpp::Options::Port(kVerisignPort));
                myRequest.setOpt(new cURLpp::Options::Timeout(kVerisignTimeout));
                myRequest.setOpt(new cURLpp::Options::Header(1));
                myRequest.setOpt(new cURLpp::Options::FollowLocation(0));
                myRequest.setOpt(new cURLpp::Options::SslVerifyPeer(0));
                myRequest.setOpt(new cURLpp::Options::SslVerifyHost(2));
                myRequest.setOpt(new cURLpp::Options::ForbidReuse(true));
                myRequest.setOpt(new cURLpp::Options::Post(1));
                myRequest.setOpt(new cURLpp::Options::HttpHeader(headers));
                myRequest.setOpt(new cURLpp::Options::PostFields(std::string(verisignArgs)));
                myRequest.setOpt(new cURLpp::Options::UserAgent("Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6"));
                //myRequest.setOpt(new cURLpp::Options::Verbose(true));

                std::ostringstream responseBuffer;
//AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tSet up output stream.  About to perform shorthand version");
                //responseBuffer << myRequest;
                        
                cURLpp::Options::WriteStream ws(&responseBuffer);
                myRequest.setOpt(ws);
AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tSet up output stream.  About to perform");
//                cout << "Content-type: text/plain" << endl << endl; 
                myRequest.perform();

AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tPerformed request");
                const char* temp = responseBuffer.str().c_str();
                responseString.CopyFrom(temp);
AddLogEntry(dbObjPtr, "INFO\tVerisign.cc\tSet Response String");

                                if (! responseString.IsEmpty())
                                {
                                        // get the reponse code
                                        if ( GetValueFromResponseString(kVSResponseFieldResult,tmpString, responseString) )
                                        {
                                                resultCode = tmpString.AsSInt();
                                                GetValueFromResponseString(kVSResponseFieldRespMsg,responseMessage, responseString);
                                                GetValueFromResponseString(kVSResponseFieldPnref,referenceID, responseString);

                                                if (resultCode == 0)
                                                {
                                                        // approved
                                                        GetValueFromResponseString(kVSResponseFieldAuthCode, answerText, responseString);
                                                        success = true;
                                                        logEntry += "\tAuthorized";
                                                        logEntry += "\t";
                                                        logEntry += answerText;
                                                        logEntry += "\t";
                                                        logEntry += referenceID;
                                                }
                                                else if (resultCode > 0)
                                                {
                                                        // declined
                                                        answerText += resultCode;
                                                        answerText += ": ";
                                                        answerText += responseMessage;

                                                        logEntry += "\tDeclined";
                                                        logEntry += "\t";
                                                        logEntry += resultCode;
                                                        logEntry += "\t";
                                                        logEntry += referenceID;
                                                        logEntry += "\t";
                                                        logEntry += responseMessage;
                                                }
                                                else
                                                {
                                                        // errror 
                                                        answerText += resultCode;
                                                        answerText += ": ";
                                                        answerText += responseMessage;

                                                        logEntry += "\tDeclined";
                                                        logEntry += "\t";
                                                        logEntry += resultCode;
                                                        logEntry += "\t";
                                                        logEntry += referenceID;
                                                        logEntry += "\t";
                                                        logEntry += responseMessage;
                                                }
                                        }
                                }
                                else
                                {
                                        answerText += "Received empty response from Verisign client.";

                                        logEntry += "\tError";
                                        logEntry += "\t";
                                        logEntry += answerText;
                                }
        }
}
catch( cURLpp::RuntimeError &e){
        logEntry += "\tError\t";
        logEntry += e.what();
        logEntry += "\t";
        AddLogEntry(dbObjPtr, "Runtime Error");
}
catch( cURLpp::LogicError &e ){
        logEntry += "\tError\t";
        logEntry += e.what();
        logEntry += "\t";
 AddLogEntry(dbObjPtr, "Logic Error");
}
catch(...){
        AddLogEntry(dbObjPtr, "General Error");
}

        AddLogEntry(dbObjPtr,logEntry);
        return success;
}



---------- Post updated at 09:10 PM ---------- Previous update was at 09:09 PM ----------

kverisignhost is the paypal payflow link. I've also tried google.com. Doesn't matter what the url is, if I set that option the program dies with no error and no explanation whatsoever.

---------- Post updated 08-17-09 at 10:31 AM ---------- Previous update was 08-16-09 at 09:10 PM ----------

I dumped the ldd info for both testing.cgi and example06. And here's what I got. Definitely something up with the libraries, but I don't know how to fix them.

testing.cgi

libmysqlclient.so.10 => /usr/lib/mysql/libmysqlclient.so.10 (0x4001e000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x40055000)
libpfpro.so => /usr/local/verisign/payflowpro/linux/lib/libpfpro.so (0x40082000)
libcurlpp.so.0 => /usr/lib/libcurlpp.so.0 (0x40128000)
libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x40152000)
libidn.so.11 => /usr/lib/libidn.so.11 (0x40205000)
libssh2.so.1 => /usr/lib/libssh2.so.1 (0x40236000)
libssl.so.0.9.7 => /usr/lib/libssl.so.0.9.7 (0x40257000)
libcrypto.so.0.9.7 => /usr/lib/libcrypto.so.0.9.7 (0x4028a000)
libldap.so.2 => /usr/lib/libldap.so.2 (0x4038f000)
libgssapi_krb5.so.2 => /usr/kerberos/lib/libgssapi_krb5.so.2 (0x403c1000)
libkrb5.so.3 => /usr/kerberos/lib/libkrb5.so.3 (0x403d4000)
libk5crypto.so.3 => /usr/kerberos/lib/libk5crypto.so.3 (0x40433000)
libz.so.1 => /usr/lib/libz.so.1 (0x40443000)
libm.so.6 => /lib/tls/libm.so.6 (0x40451000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40473000)
libc.so.6 => /lib/tls/libc.so.6 (0x42000000)
libpthread.so.0 => /lib/tls/libpthread.so.0 (0x4047b000)
libcurl.so.4 => /usr/lib/libcurl.so.4 (0x4048a000)
libnsl.so.1 => /lib/libnsl.so.1 (0x4051c000)
libssl.so.4 => /lib/libssl.so.4 (0x40531000)
libcom_err.so.3 => /usr/kerberos/lib/libcom_err.so.3 (0x40566000)
libresolv.so.2 => /lib/libresolv.so.2 (0x40568000)
libdl.so.2 => /lib/libdl.so.2 (0x4057b000)
liblber.so.2 => /usr/lib/liblber.so.2 (0x4057f000)
libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0x4058b000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

example06

libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x4001e000)
libcurl.so.3 => /usr/local/lib/libcurl.so.3 (0x400d1000)
libssl.so.0.9.7 => /usr/lib/libssl.so.0.9.7 (0x400fe000)
libcrypto.so.0.9.7 => /usr/lib/libcrypto.so.0.9.7 (0x40131000)
libdl.so.2 => /lib/libdl.so.2 (0x40236000)
libz.so.1 => /usr/lib/libz.so.1 (0x4023a000)
libm.so.6 => /lib/tls/libm.so.6 (0x40249000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x4026b000)
libc.so.6 => /lib/tls/libc.so.6 (0x42000000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)



Thanks
# 4  
Old 08-17-2009
Maybe it would be easier to debug if you would add some debug hooks and use a debugger to find out what line of the code is giving problems and why?
# 5  
Old 08-17-2009
I've been dumping log info and it's curl perform() that is causing it to die. Presumably from a linking error. Other than that I'm stuck in command line red hat and don't know how to apply a debugger. I'm kind of out of my element here.
# 6  
Old 08-17-2009
compile it with -ggdb and use the gdb commandline debugging tool to run it. There is some information on gdb here.
# 7  
Old 08-18-2009
I've run the application with strace, and don't see any point where it's failing. But then again, it's a large file and I'm not really sure what I'm looking for.
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