Support for UNIX socket in abstract namespace

(Warning this is Linux only)

Hi all, the attached path adds support for unix socket in abstract
namespace.
They are special sockets without filesystem correspondence (so you can
use
them without thinking about permissions or in chroot). In netstat they
are
reported with a ‘@’ prefix.

For example (using uWSGI):

uwsgi -s @funnysock

netstat -l

unix 2 [ ACC ] STREAM LISTENING 23813 @funnysock

After applying the patch you can connect to it with

uwsgi_pass unix:@funnysock;

I hope it can be useful

On Mon, May 23, 2011 at 04:18:30PM +0200, Roberto De Ioris wrote:

netstat -l

unix 2 [ ACC ] STREAM LISTENING 23813 @funnysock

After applying the patch you can connect to it with

uwsgi_pass unix:@funnysock;

I hope it can be useful

Thank you for the feature. I think it’s better to allow nginx
configuration
parser to support “\0” as binary 0. Then this socket may be set as

uwsgi_pass unix:\0funnysock;


Igor S.

uwsgi_pass unix:@funnysock;

I hope it can be useful

Thank you for the feature. I think it’s better to allow nginx
configuration
parser to support “\0” as binary 0. Then this socket may be set as

uwsgi_pass unix:\0funnysock;

I fear it will require changes changes as 0 being the token delimeter in
config parsing :frowning:


Roberto De Ioris
http://unbit.it

On Mon, May 23, 2011 at 07:42:02PM +0200, Roberto De Ioris wrote:

reported with a ‘@’ prefix.

I fear it will require changes changes as 0 being the token delimeter in
config parsing :frowning:

No, nginx does not use zero-trailing strings.


Igor S.

I hope it can be useful

Thank you for the feature. I think it’s better to allow nginx
configuration
parser to support “\0” as binary 0. Then this socket may be set as

uwsgi_pass unix:\0funnysock;

I fear it will require changes changes

i mean “heavy changes”


Roberto De Ioris
http://unbit.it

On Mon, May 23, 2011 at 07:42:02PM +0200, Roberto De Ioris wrote:

reported with a ‘@’ prefix.

I fear it will require changes changes as 0 being the token delimeter in
config parsing :frowning:

Could you test the attached patch ?

them without thinking about permissions or in chroot). In netstat
unix 2 [ ACC ] STREAM LISTENING 23813 @funnysock

uwsgi_pass unix:\0funnysock;

I fear it will require changes changes as 0 being the token delimeter in
config parsing :frowning:

Could you test the attached patch ?

This is the same code i made after you suggestion, but in the url
parsing
code (ngx_parse_unix_domain_url), ngx_cpystrn() is used and it takes
‘\0’
in account.

Changing ngx_cpystrn to not use \0 fixes the problem. Probably
substituting it with ngx_memcpy is the way to go.

Another thing to do is “fixing”

u->addrs[0].socklen = sizeof(struct sockaddr_un);

to

u->addrs[0].socklen = sizeof(saun->sun_family)+len;


Roberto De Ioris
http://unbit.it

On Mon, May 23, 2011 at 08:17:46PM +0200, Roberto De Ioris wrote:

substituting it with ngx_memcpy is the way to go.

Another thing to do is “fixing”

u->addrs[0].socklen = sizeof(struct sockaddr_un);

to

u->addrs[0].socklen = sizeof(saun->sun_family)+len;

nxg_memcpy should work here.


Igor S.

In addition to this discussion, I found this:
http://forum.nginx.org/read.php?29,230660,230660

I wonder if this patch is included in the main code?
I could not use unix domain sockets in abstract namespace, like this:
unix:@socket_name
nor:
unix:\0socket_name

in nginx/1.3.6

What are the chances of include this patch, where is the problem?

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,200086,230765#msg-230765

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