How to perform checksum of a file on remote server using Curl?

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How to perform checksum of a file on remote server using Curl?

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08-29-2017

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How to perform checksum of a file on remote server using Curl?

Hi, We have an AIX server and have CURL 7.40 installed in it.

We are struggling to perform checksum on the file present on the remote server (AWS). We want to validate the checksum on the file pre and post download to make sure that there is no issue with the file.

We are writing a shell script and we are using Curl for FTPS connection and downloading the file from AWS to AIX.

I have copied the code snippet that we have written to list the files and download them.

Code:

#list files on AWS server
curl -tlsv1.2 --cacert certs.cer --ftp-ssl --ftp-skip-pasv-ip --list-only --cert ${CERT_USER}:${CERT_USER_PWD} ftp://${USER_NAME}:${USER_PWD}@awscloud.com:50021/Inbox/* > ${LOGS}

#download the files mentioned in the list file
cat ${LOGS} | \
awk '{print $1}' | \
while read FILENAME
do
 echo "File being copied currently is ${FILENAME} "
 curl -tlsv1.2 --cacert certs.cer --ftp-ssl --ftp-skip-pasv-ip --cert ${CERT_USER}:${CERT_USER_PWD} ftp://${USER_NAME}:${USER_PWD}@awscloud.com:50021/Inbox/${FILENAME} -o ${FILENAME}
done

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LEARN ABOUT MOJAVE

curlopt_path_as_is

CURLOPT_PATH_AS_IS(3)					     curl_easy_setopt options					     CURLOPT_PATH_AS_IS(3)

NAME

       CURLOPT_PATH_AS_IS - do not handle dot dot sequences

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PATH_AS_IS, long leaveit);

DESCRIPTION

       Set the long leaveit to 1, to explicitly tell libcurl to not alter the given path before passing it on to the server.

       This  instructs libcurl to NOT squash sequences of "/../" or "/./" that may exist in the URL's path part and that is supposed to be removed
       according to RFC 3986 section 5.2.4.

       Some server implementations are known to (erroneously) require the dot dot sequences to remain in the path and some clients  want  to  pass
       these on in order to try out server implementations.

       By default libcurl will merge such sequences before using the path.

DEFAULT

       0

PROTOCOLS

       All

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/../../etc/password");

	 curl_easy_setopt(curl, CURLOPT_PATH_AS_IS, 1L);

	 curl_easy_perform(curl);
       }

AVAILABILITY

       Aded in 7.42.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_STDERR(3), CURLOPT_DEBUGFUNCTION(3), CURLOPT_URL(3),

libcurl 7.54.0							 February 14, 2016					     CURLOPT_PATH_AS_IS(3)