Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

doc: adapt + update

- lxc.id_map -> lxc.idmap
- document lxc.cgroup.dir
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>

conf: bugfixes

A bit of context:
userns_exec_1() is only used to operate based on privileges for the user's own
{g,u}id on the host and for the container root's unmapped {g,u}id. This means
we require only to establish a mapping from:
- the container root {g,u}id as seen from the host -> user's host {g,u}id
- the container root -> some sub{g,u}id

This function however was buggy. It relied on some pointer pointing to the same
memory, namely specific idmap entries in the idmap list in the container's
in-memory configuration. However, due to a stupid mistake of mine, the pointers
to be compared pointed to freshly allocated memory. They were never pointing to
the intended memory locations. To reproduce what I'm talking about prior to
this commit simply place:

    chb:999:1000000000
    chb:999:1
    chb:1000:1

in /etc/sub{g,u}id then create a container which requests the following
idmappings:

    lxc.idmap = u 0 999 999
    lxc.idmap = g 0 999 1000000000

and start the container. What we *would expect* is for liblxc to establish the
following mapping:

    newuidmap <pid> 0 999 999
    newgidmap <pid> 0 999 1000000000

since all required mappings are present. Due to the buggy pointer comparisons
what happened was:

    newuidmap <pid> 0 999 999 0 999 999
    newgidmap <pid> 0 999 1000000000 0 999 1000000000

Let's fix this.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

We allocate pty {master,slave} file descriptors in the childs namespaces after
we have setup devpts. After we have sent the pty file descriptors to the parent
and set up the pty file descriptors under /dev/tty* and before we exec the init
binary we need to delete these file descriptors in the child. However, one of
my commits made the deletion occur before setting up the file descriptors under
/dev/tty*. This caused a failures when trying to attach to the container's ttys
since they werent actually configured although the file descriptors were
available in the in-memory configuration of the parent.
This commit reworks setting up tty such that deletion occurs after all setup
has been performed. The commit is actually minimal but needs to also move all
the functions into one place since they well now be called from
"lxc_create_ttys()".
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

conf: record idmap that gets written

This will serve us well in the future!
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

start: document all handler fields

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

criu: add cmp_version()

We cannot use strcmp(). Otherwise we incorrectly report e.g. that criu 2.12.1
is less than 2.8.
Signed-off-by: Federico Briata <federico-pietro.briata@cnhind.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

console: non-functional change

conf: don't send ttys when none are configured

It is bad style to close an fd inside a function which didn't create it. Let's
rather close it transparently in start.c.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

network: improvements + bugfixes

Writes < PIPE_BUF will be atomic. PIPE_BUF is guaranteed to be 512 by POSIX and
Linux guarantess 4096. Nothing we send around goes over this limit.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

I thought we could send all ttys at once but this limits the number of ttys
users can use because of iovec_len restrictions. So let's sent them in batches
of 2.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

lxc_mkifname() really doesn't need to allocate any memory.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Also move all functions to network.{c,h}.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Since find_line() was changed before count_entries() started counting lines
wrong. It would report maximum reached before you actually reached your alloted
maximum.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Assume the db contained the following entries:

    chb veth lxcbr0 veth1
    chb veth lxcbr0 veth2
    chb veth lxdbr0 veth3
    chb veth lxdbr0 veth2
    didi veth lxcbr0 veth4

And you request

    cull_entries("chb", "veth", "lxdbr0", "veth3");

lxc-user-nic would wipe any entries that did not match irrespective of whether
they existed or not. Let's fix that.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

The code before inserted \0-bytes after every new line which made the db
basically unusable.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

We use data_sock for all things we need to send around between parent and child
now. It doesn't make sense to have so many different pipes and sockets if one
will do just fine.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

If netplan is present in the container, configure default networking
with neplan instead of ifupdown. Also, do not install ifupdown when
boostrapping minbase variant, unless using currently support
non-netplan releases (trusty, zenial, zesty).
Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

liblxc will now correctly log any network device names and ifindeces in their
respective network namespaces. So there's no need to record physical network
devices any more. This spares us heap allocations and memory we need to have
lying around til the container is shutdown.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

On privileged network creation we only retrieved the names and ifindeces of
network devices in the host's network namespace. This meant that the monitor
process was acting on possibly incorrect information. With this commit we have
the child send back the correct device names and ifindeces in the container's
network namespace.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

This renames the socketpair() variable "ttysock" to "data_sock" since we will
use it to send arbitrary data around, not just ttys anymore.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>