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-rw-r--r--src/vat2/plugin.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/src/vat2/plugin.c b/src/vat2/plugin.c
new file mode 100644
index 00000000000..6b6d55ac9b0
--- /dev/null
+++ b/src/vat2/plugin.c
@@ -0,0 +1,195 @@
+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * 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 <dlfcn.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <vlib/vlib.h>
+#include "vat2.h"
+
+typedef struct
+{
+ u8 *name;
+ u8 *filename;
+ struct stat file_info;
+ void *handle;
+} plugin_info_t;
+
+/* loaded plugin info */
+plugin_info_t *plugin_info;
+
+static int
+load_one_plugin (plugin_info_t * pi)
+{
+ void *handle, *register_handle;
+ clib_error_t *(*fp) (void);
+ clib_error_t *error;
+
+ handle = dlopen ((char *) pi->name, RTLD_LAZY);
+
+ /*
+ * Note: this can happen if the plugin has an undefined symbol reference,
+ * so print a warning. Otherwise, the poor slob won't know what happened.
+ * Ask me how I know that...
+ */
+ if (handle == 0)
+ {
+ clib_warning ("%s", dlerror ());
+ return -1;
+ }
+
+ pi->handle = handle;
+
+ register_handle = dlsym (pi->handle, "vat2_register_plugin");
+ if (register_handle == 0)
+ {
+ clib_warning ("%s: symbol vat2_register_plugin not found", pi->name);
+ dlclose (handle);
+ return -1;
+ }
+
+ fp = register_handle;
+
+ error = (*fp) ();
+
+ if (error)
+ {
+ clib_error_report (error);
+ dlclose (handle);
+ return -1;
+ }
+
+ return 0;
+}
+
+static u8 **
+split_plugin_path (char *plugin_path)
+{
+ int i;
+ u8 **rv = 0;
+ u8 *path = (u8 *) plugin_path;
+ u8 *this = 0;
+
+ for (i = 0; i < vec_len (plugin_path); i++)
+ {
+ if (path[i] != ':')
+ {
+ vec_add1 (this, path[i]);
+ continue;
+ }
+ vec_add1 (this, 0);
+ vec_add1 (rv, this);
+ this = 0;
+ }
+ if (this)
+ {
+ vec_add1 (this, 0);
+ vec_add1 (rv, this);
+ }
+ return rv;
+}
+
+int
+vat2_load_plugins (char *path, char *filter, int *loaded)
+{
+ DIR *dp;
+ struct dirent *entry;
+ struct stat statb;
+ uword *p;
+ plugin_info_t *pi;
+ u8 **plugin_path;
+ int i;
+ int res = 0;
+ uword *plugin_by_name_hash = hash_create_string (0, sizeof (uword));
+
+ *loaded = 0;
+ plugin_path = split_plugin_path (path);
+
+ for (i = 0; i < vec_len (plugin_path); i++)
+ {
+ DBG ("Opening path: %s\n", plugin_path[i]);
+ dp = opendir ((char *) plugin_path[i]);
+
+ if (dp == 0)
+ continue;
+
+ while ((entry = readdir (dp)))
+ {
+ u8 *plugin_name;
+
+ if (filter)
+ {
+ int j;
+ for (j = 0; j < vec_len (filter); j++)
+ if (entry->d_name[j] != filter[j])
+ goto next;
+ }
+
+ plugin_name = format (0, "%s/%s%c", plugin_path[i],
+ entry->d_name, 0);
+
+ /* unreadable */
+ if (stat ((char *) plugin_name, &statb) < 0)
+ {
+ ignore:
+ vec_free (plugin_name);
+ continue;
+ }
+
+ /* a dir or other things which aren't plugins */
+ if (!S_ISREG (statb.st_mode))
+ goto ignore;
+
+ p = hash_get_mem (plugin_by_name_hash, plugin_name);
+ if (p == 0)
+ {
+ vec_add2 (plugin_info, pi, 1);
+ pi->name = plugin_name;
+ pi->file_info = statb;
+
+ if (load_one_plugin (pi))
+ {
+ res = -1;
+ vec_free (plugin_name);
+ _vec_len (plugin_info) = vec_len (plugin_info) - 1;
+ continue;
+ }
+ clib_memset (pi, 0, sizeof (*pi));
+ hash_set_mem (plugin_by_name_hash, plugin_name,
+ pi - plugin_info);
+ *loaded = *loaded + 1;
+ }
+ next:
+ ;
+ }
+ closedir (dp);
+ vec_free (plugin_path[i]);
+ }
+ vec_free (plugin_path);
+ return res;
+}
+
+#define QUOTE_(x) #x
+#define QUOTE(x) QUOTE_(x)
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */