ftp - C++ libcurl: curl_easy_perform() returned CURLE_OK eventhough it received response code 226 -


i'm sending files linux server windows remote system using libcurl ftp.

below code

curl_easy_setopt(curlsessionhandle, curlopt_url, remotefileurl); curl_easy_setopt(curlsessionhandle, curlopt_upload, on);  // set input local file handle curl_easy_setopt(curlsessionhandle, curlopt_readdata, localfilehandle);  // set on/off wanted options // enable ftp data connection curl_easy_setopt(curlsessionhandle, curlopt_nobody, off);  // create missing directory ftp path curl_easy_setopt(curlsessionhandle, curlopt_ftp_create_missing_dirs , on) ;  // set progress function, in order check stop transfer request curl_easy_setopt(curlsessionhandle, curlopt_noprogress, off); curl_easy_setopt(curlsessionhandle, curlopt_progressfunction, progresscb); curl_easy_setopt(curlsessionhandle, curlopt_progressdata, this);  curlcode result = curl_easy_perform(curlsessionhandle);

====================================================================

few files not transferred remote didn't receive error curl_easy_perform(). happening randomly.

i have collected wireshark logs, trace shows [rst, ack] sent our side remote system don't know reason , response code 226 sent remote system, think should receive error code curl_easy_perform() instead of curle_ok. please correct me if i'm wrong.

please check image has wireshark traces.

source ip: 82 linux server & destination ip: 87 windows remote system

enter image description here

i know why sending [rst, ack] remote , why libcurl not returning error code. can explain me there way handle problem.

i have uploaded images of success , failure case. please check , let me know enter image description here

failure case, check response argenter image description here


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