Is it possible to get the md5 of a file on a remote server? If so how?
+3
A:
Well depends what you mean. There are two ways:
You connect to the remote server and calculate the hash there (like ssh to the server).
Get (download) the file and compute the hash.
Obviously to calculate the hash of a file you have to read the contents of the file.
Felix Kling
2010-02-20 23:00:11
I'm not very good with ssh. Is there an example you could provide for example 1? Like.. $a = exec('some shell stuff to return the file info');
John
2010-02-21 00:18:24
+2
A:
It's not possible without downloading it, or the remote server providing the information (web service, HTML page, etc.)
You can use md5(file_get_contents("http://remotelocation/file")) to download the file and calculate the md5 hash if your PHP installation is configured to open remote streams. But that will download the complete file.
Vinko Vrsalovic
2010-02-20 23:00:37
I tried this, but it's not the md5 of the actual file, it's the md5 of the actual output.
John
2010-02-20 23:40:08
If you are talking about a server-side script such as a `.php` file, you cannot get the MD5 stamp of it, or the source code inside it in general, via HTTP. That would be a security disaster if you could! You would have to use the appropriate connection you use to access the source on the server, eg. [S]FTP.
bobince
2010-02-21 00:00:13
Keep in mind that this will transfer the whole content of the remote file to your server. May be feasible, may be not.
VolkerK
2010-04-12 01:55:39