dns: make the dns name resolver a plugin

Type: refactor
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I823c2cd307a4613653a2d20f564dda062d4da31b

1 files changed, 346 insertions, 0 deletions

diff --git a/src/plugins/dns/dns_test.c b/src/plugins/dns/dns_test.c
new file mode 100644
index 00000000000..6b0b371dca1
--- /dev/null
+++ b/src/plugins/dns/dns_test.c
@@ -0,0 +1,346 @@
+/*
+ * dns.c - skeleton vpp-api-test plug-in
+ *
+ * Copyright (c) <current-year> <your-organization>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <vat/vat.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vppinfra/error.h>
+#include <stdbool.h>
+#include <vnet/ip/ip.h>
+
+uword unformat_sw_if_index (unformat_input_t * input, va_list * args);
+
+/* Declare message IDs */
+#include <dns/dns_msg_enum.h>
+
+/* define message structures */
+#define vl_typedefs
+#include <dns/dns_all_api_h.h>
+#undef vl_typedefs
+
+/* declare message handlers for each api */
+
+#define vl_endianfun		/* define message structures */
+#include <dns/dns_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...)
+#define vl_printfun
+#include <dns/dns_all_api_h.h>
+#undef vl_printfun
+
+/* Get the API version number. */
+#define vl_api_version(n,v) static u32 api_version=(v);
+#include <dns/dns_all_api_h.h>
+#undef vl_api_version
+
+typedef struct
+{
+  /* API message ID base */
+  u16 msg_id_base;
+  vat_main_t *vat_main;
+} dns_test_main_t;
+
+dns_test_main_t dns_test_main;
+
+#define __plugin_msg_base dns_test_main.msg_id_base
+#include <vlibapi/vat_helper_macros.h>
+
+#define foreach_standard_reply_retval_handler   \
+_(dns_enable_disable_reply)                     \
+_(dns_name_server_add_del_reply)
+
+#define _(n)                                                    \
+    static void vl_api_##n##_t_handler                          \
+    (vl_api_##n##_t * mp)                                       \
+    {                                                           \
+        vat_main_t * vam = dns_test_main.vat_main;              \
+        i32 retval = (i32) clib_net_to_host_u32(mp->retval);    \
+        if (vam->async_mode) {                                  \
+            vam->async_errors += (retval < 0);                  \
+        } else {                                                \
+            vam->retval = retval;                               \
+            vam->result_ready = 1;                              \
+        }                                                       \
+    }
+foreach_standard_reply_retval_handler;
+#undef _
+
+static void vl_api_dns_resolve_name_reply_t_handler
+  (vl_api_dns_resolve_name_reply_t * mp)
+{
+  vat_main_t *vam = dns_test_main.vat_main;
+  i32 retval = (i32) clib_net_to_host_u32 (mp->retval);
+  if (retval == 0)
+    {
+      if (mp->ip4_set)
+	clib_warning ("resolved: %U", format_ip4_address, mp->ip4_address);
+      if (mp->ip6_set)
+	clib_warning ("resolved: %U", format_ip6_address, mp->ip6_address);
+    }
+  if (vam->async_mode)
+    vam->async_errors += (retval < 0);
+  else
+    {
+      vam->retval = retval;
+      vam->result_ready = 1;
+    }
+}
+
+static void vl_api_dns_resolve_ip_reply_t_handler
+  (vl_api_dns_resolve_ip_reply_t * mp)
+{
+  vat_main_t *vam = dns_test_main.vat_main;
+  i32 retval = (i32) clib_net_to_host_u32 (mp->retval);
+  if (retval == 0)
+    clib_warning ("resolved: %s", mp->name);
+  if (vam->async_mode)
+    vam->async_errors += (retval < 0);
+  else
+    {
+      vam->retval = retval;
+      vam->result_ready = 1;
+    }
+}
+
+/*
+ * Table of message reply handlers, must include boilerplate handlers
+ * we just generated
+ */
+#define foreach_vpe_api_reply_msg                               \
+_(DNS_ENABLE_DISABLE_REPLY, dns_enable_disable_reply)           \
+_(DNS_NAME_SERVER_ADD_DEL_REPLY, dns_name_server_add_del_reply) \
+_(DNS_RESOLVE_NAME_REPLY, dns_resolve_name_reply)               \
+_(DNS_RESOLVE_IP_REPLY, dns_resolve_ip_reply)
+
+static int
+api_dns_enable_disable (vat_main_t * vam)
+{
+  vl_api_dns_enable_disable_t *mp;
+  unformat_input_t *i = vam->input;
+  int enable = 1;
+  int ret;
+
+  /* Parse args required to build the message */
+  while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (i, "disable"))
+	enable = 0;
+      else if (unformat (i, "enable"))
+	enable = 1;
+      else
+	break;
+    }
+
+  /* Construct the API message */
+  M (DNS_ENABLE_DISABLE, mp);
+  mp->enable = enable;
+
+  /* send it... */
+  S (mp);
+
+  /* Wait for a reply... */
+  W (ret);
+  return ret;
+}
+
+/*
+ * List of messages that the api test plugin sends,
+ * and that the data plane plugin processes
+ */
+#define foreach_vpe_api_msg \
+_(dns_enable_disable, "[enable][disable]")				\
+_(dns_name_server_add_del, "<ip-address> [del]")			\
+_(dns_resolve_name, "<hostname>")					\
+_(dns_resolve_ip, "<ip4|ip6>")						\
+_(dns_name_server_add_del, "<ip-address> [del]")			\
+_(dns_resolve_name, "<hostname>")
+
+static int
+api_dns_resolve_name (vat_main_t * vam)
+{
+  unformat_input_t *line_input = vam->input;
+  vl_api_dns_resolve_name_t *mp;
+  u8 *name = 0;
+  int ret;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "%s", &name))
+	;
+      else
+	break;
+    }
+
+  if (vec_len (name) > 127)
+    {
+      errmsg ("name too long");
+      return -99;
+    }
+
+  /* Construct the API message */
+  M (DNS_RESOLVE_NAME, mp);
+  memcpy (mp->name, name, vec_len (name));
+  vec_free (name);
+
+  /* send it... */
+  S (mp);
+  /* Wait for the reply */
+  W (ret);
+  return ret;
+}
+
+static int
+api_dns_resolve_ip (vat_main_t * vam)
+{
+  unformat_input_t *line_input = vam->input;
+  vl_api_dns_resolve_ip_t *mp;
+  int is_ip6 = -1;
+  ip4_address_t addr4;
+  ip6_address_t addr6;
+  int ret;
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "%U", unformat_ip6_address, &addr6))
+	is_ip6 = 1;
+      else if (unformat (line_input, "%U", unformat_ip4_address, &addr4))
+	is_ip6 = 0;
+      else
+	break;
+    }
+
+  if (is_ip6 == -1)
+    {
+      errmsg ("missing address");
+      return -99;
+    }
+
+  /* Construct the API message */
+  M (DNS_RESOLVE_IP, mp);
+  mp->is_ip6 = is_ip6;
+  if (is_ip6)
+    memcpy (mp->address, &addr6, sizeof (addr6));
+  else
+    memcpy (mp->address, &addr4, sizeof (addr4));
+
+  /* send it... */
+  S (mp);
+  /* Wait for the reply */
+  W (ret);
+  return ret;
+}
+
+static int
+api_dns_name_server_add_del (vat_main_t * vam)
+{
+  unformat_input_t *i = vam->input;
+  vl_api_dns_name_server_add_del_t *mp;
+  u8 is_add = 1;
+  ip6_address_t ip6_server;
+  ip4_address_t ip4_server;
+  int ip6_set = 0;
+  int ip4_set = 0;
+  int ret = 0;
+
+  while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (i, "%U", unformat_ip6_address, &ip6_server))
+	ip6_set = 1;
+      else if (unformat (i, "%U", unformat_ip4_address, &ip4_server))
+	ip4_set = 1;
+      else if (unformat (i, "del"))
+	is_add = 0;
+      else
+	{
+	  clib_warning ("parse error '%U'", format_unformat_error, i);
+	  return -99;
+	}
+    }
+
+  if (ip4_set && ip6_set)
+    {
+      errmsg ("Only one server address allowed per message");
+      return -99;
+    }
+  if ((ip4_set + ip6_set) == 0)
+    {
+      errmsg ("Server address required");
+      return -99;
+    }
+
+  /* Construct the API message */
+  M (DNS_NAME_SERVER_ADD_DEL, mp);
+
+  if (ip6_set)
+    {
+      memcpy (mp->server_address, &ip6_server, sizeof (ip6_address_t));
+      mp->is_ip6 = 1;
+    }
+  else
+    {
+      memcpy (mp->server_address, &ip4_server, sizeof (ip4_address_t));
+      mp->is_ip6 = 0;
+    }
+
+  mp->is_add = is_add;
+
+  /* send it... */
+  S (mp);
+
+  /* Wait for a reply, return good/bad news  */
+  W (ret);
+  return ret;
+}
+
+static void
+dns_api_hookup (vat_main_t * vam)
+{
+  dns_test_main_t *dtmp = &dns_test_main;
+  /* Hook up handlers for replies from the data plane plug-in */
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers((VL_API_##N + dtmp->msg_id_base),   \
+                           #n,                                  \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_vpe_api_reply_msg;
+#undef _
+
+  /* API messages we can send */
+#define _(n,h) hash_set_mem (vam->function_by_name, #n, api_##n);
+  foreach_vpe_api_msg;
+#undef _
+
+  /* Help strings */
+#define _(n,h) hash_set_mem (vam->help_by_name, #n, h);
+  foreach_vpe_api_msg;
+#undef _
+}
+
+VAT_PLUGIN_REGISTER (dns);
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */