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 <[email protected]>
Signed-off-by: Sander Vrijders <[email protected]>

1 files changed, 135 insertions, 0 deletions

diff --git a/src/tools/irm/irm_name_unreg.c b/src/tools/irm/irm_name_unreg.c
new file mode 100644
index 00000000..48253143
--- /dev/null
+++ b/src/tools/irm/irm_name_unreg.c
@@ -0,0 +1,135 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2020
+ *
+ * Unregister names from IPCPs
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * 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 <ouroboros/irm.h>
+
+#include "irm_ops.h"
+#include "irm_utils.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_IPCPS  128
+#define MAX_LAYERS 128
+
+static void usage(void)
+{
+        printf("Usage: irm name unregister <name>\n"
+               "           ipcp <ipcp to register with>\n"
+               "           [ipcp <ipcp to register with>]\n"
+               "           [... (maximum %d ipcps)]\n"
+               "           layer <layer to unregister from>\n"
+               "           [layer <layer to unregister from>]\n"
+               "           [... (maximum %d layers)]\n"
+               , MAX_IPCPS, MAX_LAYERS);
+}
+
+int do_unreg_name(int     argc,
+                  char ** argv)
+{
+        char *             name       = NULL;
+        char *             layers[MAX_LAYERS];
+        size_t             layers_len = 0;
+        char *             ipcp[MAX_IPCPS];
+        size_t             ipcp_len   = 0;
+        struct ipcp_info * ipcps;
+        ssize_t            len;
+        size_t             i;
+
+        name = *(argv++);
+        --argc;
+
+        while (argc > 0) {
+                if (matches(*argv, "layer") == 0) {
+                        layers[layers_len++] = *(argv + 1);
+                        if (layers_len > MAX_LAYERS) {
+                                printf("Too many layers specified.\n");
+                                return -1;
+                        }
+                } else if (matches(*argv, "ipcp") == 0) {
+                        ipcp[ipcp_len++] = *(argv + 1);
+                        if (ipcp_len > MAX_IPCPS) {
+                                printf("Too many IPCPs specified.\n");
+                                return -1;
+                        }
+                } else {
+                        printf("\"%s\" is unknown, try \"irm "
+                               "unregister\".\n", *argv);
+                        return -1;
+                }
+
+                argc -= 2;
+                argv += 2;
+        }
+
+        if ((layers_len < 1 && ipcp_len < 1) || name == NULL) {
+                usage();
+                return -1;
+        }
+
+        len = irm_list_ipcps(&ipcps);
+        if (len < 0)
+                return -1;
+
+        for (i = 0; i < (size_t) len; ++i) {
+                size_t j;
+                for (j = 0; j < layers_len; j++) {
+                        if (wildcard_match(ipcps[i].layer, layers[j]) == 0) {
+                                if (irm_unreg_name(name, ipcps[i].pid)) {
+                                        free(ipcps);
+                                        return -1;
+                                }
+                                break;
+                        }
+                }
+                for (j = 0; j < ipcp_len; j++) {
+                        if (wildcard_match(ipcps[i].name, ipcp[j]) == 0) {
+                                if (irm_unreg_name(name, ipcps[i].pid)) {
+                                        free(ipcps);
+                                        return -1;
+                                }
+                                break;
+                        }
+                }
+        }
+
+        free(ipcps);
+
+        return 0;
+}