cURL and cgi

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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.

# 2  
Old 08-16-2009
Could you please post your code?
# 3  
Old 08-17-2009

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.

// 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>

        #include "cgic.h"

// 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;
                        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\\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
        if (customerZipCode.IsEmpty())
                customerZipCode = "99999";
        customerZipCode = customerZipCode.SubString(0,5);
        if (comment.IsEmpty())
                comment = "---";
        comment = comment.SubString(0,18);
        // 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\\tEntering Try");

        if (strcasecmp(creditCardNumber,kTestCreditCardNumber) == 0)
                isTest = true;
                //answerText = kApprovedPrefixString;
                answerText += "987654321";
AddLogEntry(dbObjPtr, "INFO\\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\\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\\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\\tRest Of Headers Set");

AddLogEntry(dbObjPtr, "INFO\\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: Gecko/20070725 Firefox/"));
                //myRequest.setOpt(new cURLpp::Options::Verbose(true));

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

AddLogEntry(dbObjPtr, "INFO\\tPerformed request");
                const char* temp = responseBuffer.str().c_str();
AddLogEntry(dbObjPtr, "INFO\\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;
                                                        // errror 
                                                        answerText += resultCode;
                                                        answerText += ": ";
                                                        answerText += responseMessage;

                                                        logEntry += "\tDeclined";
                                                        logEntry += "\t";
                                                        logEntry += resultCode;
                                                        logEntry += "\t";
                                                        logEntry += referenceID;
                                                        logEntry += "\t";
                                                        logEntry += responseMessage;
                                        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");
        AddLogEntry(dbObjPtr, "General Error");

        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 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 => /usr/lib/mysql/ (0x4001e000) => /lib/ (0x40055000) => /usr/local/verisign/payflowpro/linux/lib/ (0x40082000) => /usr/lib/ (0x40128000) => /usr/lib/ (0x40152000) => /usr/lib/ (0x40205000) => /usr/lib/ (0x40236000) => /usr/lib/ (0x40257000) => /usr/lib/ (0x4028a000) => /usr/lib/ (0x4038f000) => /usr/kerberos/lib/ (0x403c1000) => /usr/kerberos/lib/ (0x403d4000) => /usr/kerberos/lib/ (0x40433000) => /usr/lib/ (0x40443000) => /lib/tls/ (0x40451000) => /lib/ (0x40473000) => /lib/tls/ (0x42000000) => /lib/tls/ (0x4047b000) => /usr/lib/ (0x4048a000) => /lib/ (0x4051c000) => /lib/ (0x40531000) => /usr/kerberos/lib/ (0x40566000) => /lib/ (0x40568000) => /lib/ (0x4057b000) => /usr/lib/ (0x4057f000) => /usr/lib/ (0x4058b000)
/lib/ => /lib/ (0x40000000)

example06 => /usr/lib/ (0x4001e000) => /usr/local/lib/ (0x400d1000) => /usr/lib/ (0x400fe000) => /usr/lib/ (0x40131000) => /lib/ (0x40236000) => /usr/lib/ (0x4023a000) => /lib/tls/ (0x40249000) => /lib/ (0x4026b000) => /lib/tls/ (0x42000000)
/lib/ => /lib/ (0x40000000)

# 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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