Into configure.ac you add something like:
---
AC_ARG_ENABLE(
[capabilities],
[AS_HELP_STRING([--enable-capabilities],[enable Linux
capabilities @<:@disabled@:>@])],
,
[enable_capabilities="no"]
)
test "${enable_capabilities}" = "yes" &&
AC_DEFINE([ENABLE_CAPABILITIES], [1], [enable Linux capabilities])
---
Then in source you test for:
#ifdef ENABLE_CAPABILITIES
Alon.
On Tue, Apr 12, 2011 at 12:03 AM, crocket <crockabisc...@gmail.com> wrote:
> How do I enable it via autoconf?
>
> On Tue, Apr 12, 2011 at 5:37 AM, Alon Bar-Lev <alon.bar...@gmail.com> wrote:
>> Usually, using cap should be enabled/disabled via autoconf.
>>
>> On Mon, Apr 11, 2011 at 11:23 PM, crocket <crockabisc...@gmail.com> wrote:
>>>
>>> diff -Naur a/init.c b/init.c
>>> --- a/init.c 2010-11-05 04:29:02.000000000 +0900
>>> +++ b/init.c 2011-04-12 05:11:43.540370471 +0900
>>> @@ -41,6 +41,10 @@
>>>
>>> #include "occ-inline.h"
>>>
>>> +#ifdef TARGET_LINUX
>>> +#include <sys/prctl.h>
>>> +#endif
>>> +
>>> static struct context *static_context; /* GLOBAL */
>>>
>>> /*
>>> @@ -904,6 +908,10 @@
>>> if (no_delay)
>>> {
>>> set_group (&c0->group_state);
>>> +#ifdef TARGET_LINUX
>>> + if(prctl(PR_SET_KEEPCAPS, 1) < 0)
>>> + msg (M_ERR, "prctl(PR_SET_KEEPCAPS, 1) failed");
>>> +#endif
>>> set_user (&c0->user_state);
>>> c0->uid_gid_set = true;
>>> }
>>>
>>> The patch is above.
>>> I had been investigating why OpenVPN refused to use CAP_IPC_LOCK capability.
>>> I found out that it was because OpenVPN invoked setuid and setuid
>>> erased POSIX capabilities.
>>> prctl(PR_SET_KEEPCAPS, 1) lets OpenVPN keep capabilities after setuid
>>> invocation.
>>>
>>> Thanks in advance for considering this patch.
>>>
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>>
>
