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Re: crash of libcurl on FreeBSD 6.0

From: GOD GOD <nusflying_at_yahoo.com.sg>
Date: Mon, 15 May 2006 20:52:39 +0800 (CST)

i have cut only the related code from c code
   
   
  
// bank related variable
bool DBSContLastSession = false;
  int main(int argc, char **argv) {
   //
 // start routine
 //
 while (true) {
    // check timing condition for further actions
  // Monday to Friday: 8:00 AM - 11:00PM 300 seconds
  // Saturday: 8:00 AM - 11:00PM 600 seconds
  // Sudany: 8:00 AM - 11:00PM 900 seconds
  
  IBCheckStatus = DBSIBCheck(HandledIB, NewIB);
  if (IBCheckStatus) {
   ERR << "[" << EventDateBuffer << "] fatal DBS IB error @ Step " << IBCheckStatus << "." << std::endl;
  }
  
  if (TimeStruct->tm_hour < 8 ||
   (TimeStruct->tm_hour == 23 && TimeStruct->tm_min > 20)) {
   // between 11:20 PM and 8:00 AM
     // to do
   // 1. update date string
   // 2. determine a big time interval to sleep
     // task 2
   if (TimeStruct->tm_hour == 23) {
    ToSleepTime = 8 * 3600 + (60 - TimeStruct->tm_min) * 60;
    TimeStruct->tm_mday += 1;
   } else {
    ToSleepTime = (8 - TimeStruct->tm_hour) * 3600 - TimeStruct->tm_min * 60;
   }
     // bank session halts
   DBSContLastSession = false;
    } else {
   if (TimeStruct->tm_wday == SUNDAY) {
    ToSleepTime = 600; // 10 minutes
   } else if (TimeStruct->tm_wday == SATURDAY) {
    ToSleepTime = 300; // 5 minutes
   } else {
    ToSleepTime = 180; // 3 minutes
   }
  }
    sleep(ToSleepTime);
 }
   return 0;
}
  
void DBSCurlInitialize() {
   if (DBSCurlHandle) {
  // cleanup curl stuff
  curl_easy_cleanup(DBSCurlHandle);
 }
 
 curl_global_init(CURL_GLOBAL_ALL);
   // init the curl session
 DBSCurlHandle = curl_easy_init();
   // some servers don't like requests that are made without a user-agent
 // field, so we provide one
 curl_easy_setopt(DBSCurlHandle, CURLOPT_USERAGENT, BROWSER_AGENT);
   // send all data to this function
 curl_easy_setopt(DBSCurlHandle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
   // DBSCurlResponse struct to the callback function
 curl_easy_setopt(DBSCurlHandle, CURLOPT_WRITEDATA, (void *)& DBSCurlResponse);
 
 // POST variable & HTTP URL
 curl_easy_setopt(DBSCurlHandle, CURLOPT_POSTFIELDS, DBSFormPOSTVariable);
 curl_easy_setopt(DBSCurlHandle, CURLOPT_URL, DBSHTTPURLBuffer);
}
  /*
check dbs ibanking procedure
*/
int DBSIBCheck(std::vector <IBInfo *> & HandledIB, std::vector <IBInfo *> & NewIB) {
   // return immediately whenever anything is wrong.
 // due to abnormal exit, we need to clear memory
 if (DBSCurlResponse.memory) {
  
  free(DBSCurlResponse.memory);
    DBSCurlResponse.memory = NULL;
  DBSCurlResponse.size = 0;
 }
   
 //
 // STEP 0
 // check whether to continue last session
 //
   if (DBSContLastSession) {
  
  //std::cout << "continue last session" << std::endl;
  
  DBSContLastSession = false;
  goto DBS_CONT_LAST_SESSION;
   } else {
    //std::cout << "use new session" << std::endl;
  
  DBSCurlInitialize();
   }
   //
 // STEP 1
 // GET DBS Login Page
 //
   // specify URL & POST content variables
 strcpy(DBSHTTPURLBuffer, "https://SOMEHTTPSURL");
 strcpy(DBSFormPOSTVariable, "FROM_IB=TRUE");
   // fetch DBS web page
 // ============> the bug is found here <====================
 // after long time sleep, e.g. 8 hours.
 curl_easy_perform(DBSCurlHandle);
 sleep(2);
   if (DBSCurlResponse.memory == NULL) {
  return 100;
 }
 
 /// A LOT OF STEPS
 // BLAH BLAH BLAH BLAH BLAH BLAH
  
DBS_CONT_LAST_SESSION:
   // fetch DBS web page
 curl_easy_perform(DBSCurlHandle);
 sleep(2);
   if (DBSCurlResponse.memory == NULL) {
  return 104;
 }
   // no error till now, so to
 // continue this session next time
 DBSContLastSession = true;
   return 0;
}

cremes.devlist_at_mac.com wrote:
  
On May 15, 2006, at 7:07 AM, GOD GOD wrote:

> I have tried to write a programme based on libcurl to regularly
> retrieve a HTTPS web page. This programme sleeps regular at night
> time, and wake up at 8 sharp morning.
>
> The programme i completed works well on Redhat Linux 9.0. When i
> tried to port to FreeBSD 6.0 . I found the programme crashes, when
> waking up. I have tried to locate the bugs to
>
> this line "curl_easy_perform(SomeCurlHandle);"
>
> Is this an OS related problem?
> What i guess, upon the problem, is FreeBSD regularly clean up the
> socket resource, which happens to touch the data struct of the curl
> handle, becuase the programme sleeps for 8 hours. This does not
> cause a problem on Red Hat Linux, and it does happen on FreeBSD.
> When the programme (on FreeBSD) gets back to run again, the data
> structure is ruined. It Crashes.
>
> Can anyone help me to figure out? I have already tried to GOOGLE,
> no much information out.

Post your code. No one can help you based on what you've written
above. Also, tell us what version of libcurl you are using.

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Received on 2006-05-15

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