I have been trying to create a function that returns true if a file exists
or not on a TFTP server. I had a function for this for SFTP/FTP using
CURLOPT_NOBODY, and that has been for those protocols. However, did not
work for TFTP. I have managed to make a function that checks if a file
exists on a TFTP server, I am just uncertain if this is the right way to go
about it.
size_t failIfWrite(char* buffer, size_t size, size_t nmemb, void* _) {
return 0;
}
bool ServerClass::fileExistOnServer(CURL* curl, const std::string&
fileOnServer) const {
bool exist = false;
setGenericCurlData(curl, fileOnServer);
if (m_protocol == "tftp") {
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, failIfWrite);
}
curl_easy_setopt(curl, CURLOPT_NOBODY, true);
CURLcode res = curl_easy_perform(curl);
if (res == CURLE_OK) {
exist = true;
}
else if (res == CURLE_WRITE_ERROR && m_protocol == "tftp") {
exist = true;
}
else if (res != CURLE_REMOTE_FILE_NOT_FOUND || res != CURLE_TFTP_NOTFOUND) {
spdlog::doSpdLog(m_logger, spdlog::level::info, "could not
search for file due to '{}'", curl_easy_strerror(res));
}
return exist;
}
Note:
setGenericCurlData just set server address, username, ports, protocol etc..
It simply calls a Write error when curl starts to call my custom write
function, and if it does, I know there is data to be written, which means
that the file exists.
I do something very similar to get file size on TFTP, simply put, I use my
own progression call back, and abort that call back when I get a value in "
dltotal", and use that as the file size.
I am just wondering if there is an easier way to do this or if there is
some CURLOPT for this?
-- Tomas Berger
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