irm: Revise naming API

This revises the naming API to treat names (or reg_name in the source)
as first-class citizens of the architecture. This is more in line with
the way they are described in the article.

Operations have been added to create/destroy names independently of
registering. This was previously done only as part of register, and
there was no way to delete a name from the IRMd.  The create call now
allows specifying a policy for load-balancing incoming flows for a
name. The default is the new round-robin load-balancer, the previous
behaviour is still available as a spillover load-balancer.

The register calls will still create a name if it doesn't exist, with
the default round-robin load-balancer.

The tools now have a "name" section, so the format is now

irm name <operation> <name> ...

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 98 insertions, 0 deletions

diff --git a/src/tools/irm/irm_name.c b/src/tools/irm/irm_name.c
new file mode 100644
index 00000000..3a615b00
--- /dev/null
+++ b/src/tools/irm/irm_name.c
@@ -0,0 +1,98 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2020
+ *
+ * A tool to instruct the IRM daemon
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+
+#include "irm_ops.h"
+#include "irm_utils.h"
+
+static void usage(void)
+{
+        printf("Usage: irm name [OPERATION]\n\n"
+               "where OPERATION = {create destroy\n"
+               "                   register unregister\n"
+               "                   list help}\n");
+}
+
+static int do_help(int argc, char **argv)
+{
+        (void) argc;
+        (void) argv;
+
+        usage();
+        return 0;
+}
+
+static const struct cmd {
+        const char * cmd;
+        int (* func)(int argc, char ** argv);
+} cmds[] = {
+        { "create",     do_create_name },
+        { "destroy",    do_destroy_name },
+        { "register",   do_reg_name },
+        { "unregister", do_unreg_name },
+        { "list",       do_list_name},
+        { "help",       do_help },
+        { NULL,         NULL }
+};
+
+static int do_cmd(const char * argv0,
+                  int          argc,
+                  char **      argv)
+{
+        const struct cmd * c;
+
+        for (c = cmds; c->cmd; ++c) {
+                if (matches(argv0, c->cmd) == 0)
+                        return c->func(argc - 1, argv + 1);
+        }
+
+        fprintf(stderr, "\"%s\" is unknown, try \"irm ipcp help\".\n", argv0);
+
+        return -1;
+}
+
+int name_cmd(int argc, char ** argv)
+{
+        if (argc < 1) {
+                usage();
+                return -1;
+        }
+
+        return do_cmd(argv[0], argc, argv);
+}