Date: Fri, 14 Aug 2009 08:11:26 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: freebsd-hackers@freebsd.org Cc: bert wiley <bertwiley@gmail.com> Subject: Re: Need help trying to to use the ntohl() call with in_addr Message-ID: <20090814080915.J93661@maildrop.int.zabbadoz.net> In-Reply-To: <200908140944.44141.max@love2party.net> References: <9527461a0908132029xb2c6149r9f51c775d22ae670@mail.gmail.com> <200908140944.44141.max@love2party.net>
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On Fri, 14 Aug 2009, Max Laier wrote:
> On Friday 14 August 2009 05:29:19 bert wiley wrote:
>> Hi everyone
>>
>> Im new to list and this question may be out of place. This is my first
>> post. Im new to freebsd and trying to understand how to create a jail from
>> some system calls. I followed the jail subsystem description from the
>> handbook and im having a problem or may be using the call incorrectly. But
>> here is what im trying to do.
>>
>>
>> int main()
>> {
>> struct in_addr ipaddr;
>> struct jail myjail;
>>
>> char path[PATH_MAX];
>>
>> realpath("/tmp", path);
>>
>> myjail.version = 1;
>> myjail.path = path;
>> myjail.hostname = "testjail";
>>
>> const char *ip;
>> ip = "192.168.1.142";
>>
>> inet_aton(ip, &ipaddr);
>> myjail.ip4 = ntohl(ipaddr.s_addr); // I get and error here, invalid
>> conversion from _uint32_t' to in_addr*
>> myjail.ip4 = ipaddr.s_addr; // and and error here, invlid
>> conversion from in_addr_t to in_addr*
>> }
>>
>>
>> I know that there is more that needs to be done but this just a test stub
>> as im trying to work thru the calls and understand whats going on.
>> Any would be appreciated thanks.
>
> Take a look at the jail(2) man page:
>
> The ``ip4s'' and ``ip6s'' give the numbers of IPv4 and IPv6 addresses
> that will be passed via their respective pointers.
>
> The ``ip4'' and ``ip6'' pointers can be set to an arrays of IPv4 and IPv6
> addresses to be assigned to the prison, or NULL if none. IPv4 addresses
> must be in network byte order.
>
> So you'd do something like the following:
>
> myjail.ip4s = 1;
> inet_aton(ip, &ipaddr);
> myjail.ip4 = &ipaddr;
>
> You don't have to switch byte order.
and in that case of 7.2-R or later multi-IP jails the version should
not be 1 either.
I fixed tools/regressions/priv the other day; maybe this helps a bit
as well:
http://svn.freebsd.org/viewvc/base/head/tools/regression/priv/main.c?r1=173679&r2=196172
/bz
--
Bjoern A. Zeeb What was I talking about and who are you again?
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