* src/main.c : add needed callbacks for openvpn

src/main.c

@@ -6,14 +6,85 @@
 
 #include "config.h"
 
-int main(void) {
-  oal_config_t config;
-  memset(&config, 0x0, sizeof(oal_config_t));
+static const char *OAL_NAME = "openvpn-ldap-auth";
 
-  if (!parse_config(&config, "test.conf")) {
-    fprintf(stderr, "config parser failed: %s\n", config.error);
-    exit(1);
+/**
+ * Given an environmental variable name, search
+ * the envp array for its value, returning it
+ * if found or NULL otherwise.
+ */
+static const char *
+get_env (const char *name, const char *envp[]) {
+  const int namelen = strlen(name);
+  const char *cp;
+  short int i;
+
+  if (!envp)
+    return NULL;
+
+  for (i = 0; envp[i]; i++) {
+	  if (strncmp(envp[i], name, namelen) == 0) {
+      cp = envp[i] + namelen;
+	    if (*cp == '=')
+	      return cp + 1;
+    }
+	}
+
+  return NULL;
+}
+
+OPENVPN_EXPORT int openvpn_plugin_min_version_required_v1(void)
+{
+  return 3;
+}
+
+OPENVPN_EXPORT int
+openvpn_plugin_open_v3 (const int v3structver,
+                        struct openvpn_plugin_args_open_in const *args,
+                        struct openvpn_plugin_args_open_return *ret)
+{
+  oal_config_t *config;
+
+  if (v3structver != OPENVPN_PLUGINv3_STRUCTVER)
+    return OPENVPN_PLUGIN_FUNC_ERROR;
+
+  config = (oal_config_t *) calloc (1, sizeof (oal_config_t));
+
+  if (parse_config(config, args->argv[0]) != 0) {
+    args->callbacks->plugin_log(PLOG_ERR, OAL_NAME,
+      "config parser failed: %s", config->error);
+    return OPENVPN_PLUGIN_FUNC_ERROR;
   }
 
-  return 0;
+  ret->type_mask = OPENVPN_PLUGIN_MASK (OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY);
+  ret->handle    = (void *) config;
+
+  return OPENVPN_PLUGIN_FUNC_SUCCESS;
+}
+
+OPENVPN_EXPORT int
+openvpn_plugin_func_v3 (const int version,
+                        struct openvpn_plugin_args_func_in const *args,
+                        struct openvpn_plugin_args_func_return *retptr)
+{
+  oal_config_t *config = (oal_config_t *) args->handle;
+
+  /* get username/password from envp string array */
+  const char *username = get_env("username", args->envp);
+  const char *password = get_env("password", args->envp);
+
+  if (args->type == OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY) {
+    /* check entered username/password against what we require */
+    if (check_against_ldap(config, username, password) == 0)
+      return OPENVPN_PLUGIN_FUNC_SUCCESS;
+  }
+
+  return OPENVPN_PLUGIN_FUNC_ERROR;
+}
+
+OPENVPN_EXPORT void
+openvpn_plugin_close_v1 (openvpn_plugin_handle_t handle)
+{
+  oal_config_t *config = (oal_config_t *) handle;
+  free(config);
 }