RPKI protocol with one cache server per protocol

The RPKI protocol (RFC 6810) using the RTRLib
(http://rpki.realmv6.org/) that is integrated inside
the BIRD's code.

Implemeted transports are:
 - unprotected transport over TCP
 - secure transport over SSHv2

Example configuration of bird.conf:
  ...
  roa4 table r4;
  roa6 table r6;

  protocol rpki {
    debug all;

    # Import both IPv4 and IPv6 ROAs
    roa4 { table r4; };
    roa6 { table r6; };

    # Set cache server (validator) address,
    # overwrite default port 323
    remote "rpki-validator.realmv6.org" port 8282;

    # Overwrite default time intervals
    retry   10;         # Default 600 seconds
    refresh 60;         # Default 3600 seconds
    expire 600;         # Default 7200 seconds
  }

  protocol rpki {
    debug all;

    # Import only IPv4 routes
    roa4 { table r4; };

    # Set cache server address to localhost,
    # use default ports tcp => 323 or ssh => 22
    remote 127.0.0.1;

    # Use SSH transport instead of unprotected transport over TCP
    ssh encryption {
      bird private key "/home/birdgeek/.ssh/id_rsa";
      remote public key "/home/birdgeek/.ssh/known_hosts";
      user "birdgeek";
    };
  }
  ...

1 files changed, 78 insertions, 0 deletions

diff --git a/proto/rpki/tcp_transport.c b/proto/rpki/tcp_transport.c
new file mode 100644
index 00000000..6c05964a
--- /dev/null
+++ b/proto/rpki/tcp_transport.c
@@ -0,0 +1,78 @@
+/*
+ *	BIRD -- An implementation of the TCP protocol for the RPKI protocol transport
+ *
+ *	(c) 2015 CZ.NIC
+ *	(c) 2015 Pavel Tvrdik <pawel.tvrdik@gmail.com>
+ *
+ *	This file was a part of RTRlib: http://rpki.realmv6.org/
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <errno.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "rpki.h"
+#include "sysdep/unix/unix.h"
+
+static int
+rpki_tr_tcp_open(struct rpki_tr_sock *tr)
+{
+  sock *sk = tr->sk;
+
+  sk->type = SK_TCP_ACTIVE;
+
+  if (sk_open(sk) != 0)
+    return RPKI_TR_ERROR;
+
+  return RPKI_TR_SUCCESS;
+}
+
+static const char *
+rpki_tr_tcp_ident(struct rpki_tr_sock *tr)
+{
+  ASSERT(tr != NULL);
+
+  struct rpki_cache *cache = tr->cache;
+  struct rpki_config *cf = (void *) cache->p->p.cf;
+
+  if (tr->ident != NULL)
+    return tr->ident;
+
+  const char *host = cf->hostname;
+  ip_addr ip = cf->ip;
+  u16 port = cf->port;
+
+  size_t colon_and_port_len = 6; /* max ":65535" */
+  size_t ident_len;
+  if (host)
+    ident_len = strlen(host) + colon_and_port_len + 1;
+  else
+    ident_len = IPA_MAX_TEXT_LENGTH + colon_and_port_len + 1;
+
+  char *ident = mb_alloc(cache->pool, ident_len);
+  if (host)
+    bsnprintf(ident, ident_len, "%s:%u", host, port);
+  else
+    bsnprintf(ident, ident_len, "%I:%u", ip, port);
+
+  tr->ident = ident;
+  return tr->ident;
+}
+
+/**
+ * rpki_tr_tcp_init - initializes the RPKI transport structure for a TCP connection
+ * @tr: allocated RPKI transport structure
+ */
+void
+rpki_tr_tcp_init(struct rpki_tr_sock *tr)
+{
+  tr->open_fp = &rpki_tr_tcp_open;
+  tr->ident_fp = &rpki_tr_tcp_ident;
+}