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shell_exec Help
Hi I am have trouble getting the header info of this url. Basically the url contains some illegal characters and curl throws an error
$filesize_cmd='curl --head -g '.escapeshellarg(urldecode($direct_download_link)).' 2>&1';
curl: (3) Illegal characters found in URL
The documentation says...appending a -g parameter should fix it but still getting the error.
Note:I only get this error I pass it through shell_exec($cmd);
if I var dump the command and paste it in terminal it runs fine...
So no idea what is going wrong...:-(
btw...the url is 800 characters long...
Comments
Why are you using shell_exec for this instead of http://php.net/manual/en/book.curl.php ?
if you don't mind...I would like to use that way...could you help me out?
Please, please, please don't use shell_exec unless you absolutely have to.
http://stackoverflow.com/questions/1401131/easiest-way-to-grab-filesize-of-remote-file-in-php
Sounds like a bad idea, but whatever. Why are you decoding
$direct_download_link? Maybe you should rawurlencode it so all illegal characters are turned to non-illegal characters.@drazilox...
Not working using rawurencode
@Mun
I know....I have to use shell_exec for some other command... but using this approach it gives me a 403 error....but when using the terminal it gives me 200.I wonder why?
Stop investing in shell_exec, you can do this fully and safer with straight php5 and php5-curl. This my link to stackoverflow
I'm curious of what that would be. I'm not sure why it doesn't work, but I'm pretty sure you're approaching this from the wrong direction.
@Mun...It was suppose to be easier that way ...:-(....
I only have one query what could be the possible reasons
shell_exec($cmd);
gives error
var_dump($cmd) ...copy into terminal...voila!...works like a charm.......I only need to know what is the bug that doesnot make it run in shell_exec?
I agree with others that it would be safer to do this through PHP, since it's already possible. Using "shell_exec" with this might be a risk especially if the URL is a variable the user can edit, as it could expose your system to injections. Here's a ready made PHP function to determine the size of a URL (the same approach used in @Mun's link):
function getRemoteFilesize( $url ) { $head = array_change_key_case(get_headers(urldecode($url), TRUE)); $size = $head['content-length']; return $size; }Example usage:
echo getRemoteFilesize("http://example.com/index.html"); //1270 (in bytes)Edit: if you insist on using shell_exec, you might want to debug the issue by manually executing the command passed to shell_exec on the server to see where the problem lies. To do this, output the
$filesize_cmdvariable then copy and paste it into your SSH session to see what exactly happens:okay...actually its a simple youtube caching and a streaming link Since youtube is banned in my country .That I plan to use for my personal usage I dont mind shell_exec ....Your getRemoteFilesize apparently doesnot work with the youtube url. I used youtube-dl webui sort of similar script that I found on github.But it downloads the file it your server.I was looking to make a script that insteads of downloading , It should cache 2-4mbs of data form youtube link and then echos it out....and do it again and again...
curl --head "https://r3---sn-a5m7ln7z.googlevideo.com/videoplaybac
k?pl=44&ipbits=0&upn=Ou1BaNtoN_w&requiressl=yes&sver=3&ratebypass=yes&itag=18&dur=415.613&lmt=1442234822929462&fexp=9408710,9409069,9412843,9412913,9414764,9415365,9415485,9415869,9416023,9416075,9416126,9416556,9417260,9417707,9418153,9418448,9418908,9419309,9419446,9420348,9420983,9421013,9421295,9421709,9421742&expire=1444088755&sparams=dur,id,initcwndbps,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pl,ratebypass,requiressl,source,upn,expire&mime=video/mp4&key=yt6&initcwndbps=25320000&id=o-AHBTr1yKaUJSV_mBYvpCJsMlh9BLsAg1cHnqMiPGKSTL&source=youtube&mm=31&mn=sn-a5m7ln7z&ms=au&mt=1444067096&mv=m&ip=*****&signature=0BAFDC7878465631B612AF3356383A52DFA8A22F.97C32EE00C52CB573D5F6B3B76C3761FB2202521"
HTTP/1.1 200 OK
Last-Modified: Mon, 14 Sep 2015 12:47:02 GMT
Content-Type: video/mp4
Date: Mon, 05 Oct 2015 17:47:38 GMT
Expires: Mon, 05 Oct 2015 17:47:38 GMT
Cache-Control: private, max-age=21197
Accept-Ranges: bytes
Content-Length: 32700109
Connection: close
Alternate-Protocol: 443:quic,p=0.45
Note ...Ip removed from the url...
I get 403 when I try to curl that.
@drazilox
Thesed urls are ip restricted...you will always be getting a 403
Also, since you removed the IP, the signature will be different.
okay...I got it working using a hack...but still don't understand why it was not working?