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Re: [Bug-wget] Check for SSL support in wget

From: Micah Cowan
Subject: Re: [Bug-wget] Check for SSL support in wget
Date: Thu, 26 Feb 2009 08:27:15 -0800
User-agent: Thunderbird (X11/20090105)

Hash: SHA1

Martin Paul wrote:
> Hi,
> I'm using wget in a script, and want to use HTTPS instead of HTTP if
> wget supports it. Therefore I'm looking for a supported way to determine
> whether a certain instance of wget supports HTTPS.
> Looking through the source of various wget versions, I found this to be
> one way:
>   wget --help | grep HTTPS
> This works because wget (>= 1.10) only shows the HTTPS options if it's
> compiled with SSL support. As far as older releases are concerned, I
> could check for the old deprecated SSL options or always use http with
> those old binaries.
> Is there a better way to perform the check I need? Is the method I use
> now supposed to be supported in ongoing versions of wget?

In currently-released versions of Wget, you're stuck with the trick
above. However, in current development versions, wget --version now
produces output like:

- --------------------------------------------------------------
GNU Wget 1.12-devel (7fc761b25158)
Options    : +digest +ipv6 +nls +ntlm +opie +md5/openssl -gnutls
             +openssl +gettext
Wgetrc     : /opt/wget/etc/wgetrc (system)
Locale     : /opt/wget/share/locale
Compile    : gcc -DHAVE_CONFIG_H -DSYSTEM_WGETRC="/opt/wget/etc/wgetrc"
             -DLOCALEDIR="/opt/wget/share/locale" -I. -I../lib -g
Link       : gcc -g -lssl -lcrypto -ldl -lrt ftp-opie.o openssl.o
             http-ntlm.o gen-md5.o ../lib/libgnu.a

Copyright © 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Originally written by Hrvoje Nikšić <address@hidden>.
Currently maintained by Micah Cowan <address@hidden>.
Please send bug reports and questions to <address@hidden>.
- --------------------------------------------------------------

Thanks to work done by Madhusudan Hosaagrahara. So you would probably
grep for either of +gnutls or +openssl (it might be worthwhile to
explicitly have a separate, generic +ssl or +https to explicitly
indicate HTTPS support regardless of what implementation is used). This
sort of thing will be supported in future versions; I can't promise your
current method will be.

- --
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer.
Maintainer of GNU Wget and GNU Teseq
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org


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