Implement serialisation of our current forwarding rules in conf.c,
deserialising it to display in the pesto client.  Doing this requires
adding ip.c, inany.c, bitmap.c, lineread.c and fwd_rule.c to the pesto
build.  With previous preparations that now requires only a trivial change
to lineread.c.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Use ntohs() for rule->to instead of htons() in
 fwd_rule_read(), reported by Jon Maloy]
[sbrivio: Add upper bound check on pc->fwd.count for count of rules
 received by pesto, reported missing by Laurent, plus nits also
 reported by Laurent]
[sbrivio: Fix conflicts in Makefile]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

Extend the dynamic update protocol to expose the pif indices and names
from a running passt/pasta to the pesto tool.  pesto records that data
and prints it out.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: In read_pif_conf(), force a redundant termination of the
 interface name, the existing check isn't obvious enough for static
 checkers]
[sbrivio: Drop @resv_ left-over in description of struct
 pesto_pif_info, reported by Jon Maloy]
[sbrivio: Fix minor nits reported by Laurent]
[sbrivio: Initialise struct pesto_pif_info in conf_send_rules() with
 zeroes, otherwise the pif name might be seen as not terminated, and
 we'll expose memory from the back-end]
[sbrivio: Fix conflicts in Makefile]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

Start implementing pesto in earnest.  Create a control/configuration
socket in passt.  Have pesto connect to it and retrieve a server greeting
Perform some basic version checking.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[sbrivio: Avoid potential recursive calling between conf_accept() and
 conf_close(), reported by clang-tidy]
[sbrivio: In conf(), check we're not exceeding sizeof(c->control_path)
 instead of sizeof(c->socket_path), and, in pesto's main(), print
 argv[optind] instead of argv[1] to indicate an invalid socket path,
 both reported by Jon Maloy]
[sbrivio: In pesto's main(), drop unnecessary newline from error
 message, reported by Laurent]
[sbrivio: Don't use SOCK_NONBLOCK on accept4(), as that only applies
 to the *new* file descriptor, which we don't want -- set O_NONBLOCK
 on the listening file descriptor using fcntl()]
[sbrivio: Switch to protocol version 1, and reflect the true magic
 behind pesto, i.e. basil, into the magic string]
[sbrivio: Fix conflicts in the Makefile caused by the fact that I'm
 not merging a previous series reworking it]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>

Build a new "pesto" binary, which will become the tool to update a running
passt/pasta's configuration.  For now, we just build a stub binary which
sets up a basic environment, parses trivial command line options but does
nothing else.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[sbrivio: Dropped leading _ from comment to include guard endif,
 reported by Laurent]
[sbrivio: Formatting changes in pesto.1: use 80 columns instead of
 wrapping at about 75. Add description for -d, -h, --version.]
[sbrivio: Drop note from man page about pesto being experimental,
 we're shipping it so that people can actually use it]
[sbrivio: Fix conflicts in the Makefile as I'm not applying the
 previous series reworking it]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>