bindings: adds ability to use data of applications

The two new verbs 'afb_daemon_rootdir_get_fd' and
'afb_daemon_rootdir_open_locale' allow the bindings to retrieve
its installed global data.

Change-Id: I369997d9e59402a413a929aa650c48613f034183
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

5 files changed, 110 insertions, 1 deletions

diff --git a/include/afb/afb-binding.h b/include/afb/afb-binding.h
index 7058b6d0..7d5da112 100644
--- a/include/afb/afb-binding.h
+++ b/include/afb/afb-binding.h
@@ -147,6 +147,8 @@ struct afb_daemon_itf {
        struct sd_bus *(*get_system_bus)(void *closure);        /* gets the common systemd's system d-bus */
        void (*vverbose)(void*closure, int level, const char *file, int line, const char *fmt, va_list args);
        struct afb_event (*event_make)(void *closure, const char *name); /* creates an event of 'name' */
+       int (*rootdir_get_fd)(void *closure);
+       int (*rootdir_open_locale)(void *closure, const char *filename, int flags, const char *locale);
 };
 
 /*
@@ -259,3 +261,23 @@ static inline void afb_daemon_verbose(struct afb_daemon daemon, int level, const
 # endif
 #endif
 
+/*
+ * Get the root directory file descriptor. This file descriptor can
+ * be used with functions 'openat', 'fstatat', ...
+ */
+static inline int afb_daemon_rootdir_get_fd(struct afb_daemon daemon)
+{
+	return daemon.itf->rootdir_get_fd(daemon.closure);
+}
+
+/*
+ * Opens 'filename' within the root directory with 'flags' (see function openat)
+ * using the 'locale' definition (example: "jp,en-US") that can be NULL.
+ * Returns the file descriptor or -1 in case of error.
+ */
+static inline int afb_daemon_rootdir_open_locale(struct afb_daemon daemon, const char *filename, int flags, const char *locale)
+{
+	return daemon.itf->rootdir_open_locale(daemon.closure, filename, flags, locale);
+}
+
+
diff --git a/src/afb-api-so.c b/src/afb-api-so.c
index d7609bba..ef1bbcc2 100644
--- a/src/afb-api-so.c
+++ b/src/afb-api-so.c
@@ -67,6 +67,8 @@ static int api_timeout = 15;
 static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name);
 static int afb_api_so_event_broadcast_cb(void *closure, const char *name, struct json_object *object);
 static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, int line, const char *fmt, va_list args);
+static int afb_api_so_rootdir_get_fd(void *closure);
+static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale);
 
 static const struct afb_daemon_itf daemon_itf = {
 	.event_broadcast = afb_api_so_event_broadcast_cb,
@@ -74,7 +76,9 @@ static const struct afb_daemon_itf daemon_itf = {
 	.get_user_bus = afb_common_get_user_bus,
 	.get_system_bus = afb_common_get_system_bus,
 	.vverbose = afb_api_so_vverbose_cb,
-	.event_make = afb_api_so_event_make_cb
+	.event_make = afb_api_so_event_make_cb,
+	.rootdir_get_fd = afb_api_so_rootdir_get_fd,
+	.rootdir_open_locale = afb_api_so_rootdir_open_locale
 };
 
 static struct afb_event afb_api_so_event_make_cb(void *closure, const char *name)
@@ -125,6 +129,16 @@ static void afb_api_so_vverbose_cb(void *closure, int level, const char *file, i
 	}
 }
 
+static int afb_api_so_rootdir_get_fd(void *closure)
+{
+	return afb_common_rootdir_get_fd();
+}
+
+static int afb_api_so_rootdir_open_locale(void *closure, const char *filename, int flags, const char *locale)
+{
+	return afb_common_rootdir_open_locale(filename, flags, locale);
+}
+
 static void monitored_call(int signum, void *arg)
 {
 	struct monitoring *data = arg;
diff --git a/src/afb-common.c b/src/afb-common.c
index 2b16e573..81bf5376 100644
--- a/src/afb-common.c
+++ b/src/afb-common.c
@@ -17,11 +17,19 @@
 
 #define _GNU_SOURCE
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 #include <errno.h>
 #include <systemd/sd-event.h>
 #include <systemd/sd-bus.h>
 
 #include "afb-common.h"
+#include "locale-root.h"
+
+static const char *default_locale = NULL;
+static struct locale_root *rootdir = NULL;
 
 /*
 struct sd_event *afb_common_get_thread_event_loop()
@@ -85,5 +93,57 @@ struct sd_bus *afb_common_get_system_bus()
 	return sdbusopen((void*)&result, (void*)sd_bus_open_system);
 }
 
+void afb_common_default_locale_set(const char *locale)
+{
+	default_locale = locale;
+}
+
+const char *afb_common_default_locale_get()
+{
+	return default_locale;
+}
+
+int afb_common_rootdir_set(const char *dirname)
+{
+	int dirfd, rc;
+	struct locale_root *root;
+	struct locale_search *search;
+
+	rc = -1;
+	dirfd = openat(AT_FDCWD, dirname, O_PATH|O_DIRECTORY);
+	if (dirfd < 0) {
+		/* TODO message */
+	} else {
+		root = locale_root_create(dirfd);
+		if (root == NULL) {
+			/* TODO message */
+			close(dirfd);
+		} else {
+			rc = 0;
+			if (default_locale != NULL) {
+				search = locale_root_search(root, default_locale, 0);
+				if (search == NULL) {
+					/* TODO message */
+				} else {
+					locale_root_set_default_search(root, search);
+					locale_search_unref(search);
+				}
+			}
+			locale_root_unref(rootdir);
+			rootdir = root;
+		}
+	}
+	return rc;
+}
+
+int afb_common_rootdir_get_fd()
+{
+	return locale_root_get_dirfd(rootdir);
+}
+
+int afb_common_rootdir_open_locale(const char *filename, int flags, const char *locale)
+{
+	return locale_root_open(rootdir, filename, flags, locale);
+}
 
 
diff --git a/src/afb-common.h b/src/afb-common.h
index 4d6327c1..676b3ddc 100644
--- a/src/afb-common.h
+++ b/src/afb-common.h
@@ -24,3 +24,10 @@ extern struct sd_event *afb_common_get_event_loop();
 extern struct sd_bus *afb_common_get_user_bus();
 extern struct sd_bus *afb_common_get_system_bus();
 
+extern void afb_common_default_locale_set(const char *locale);
+extern const char *afb_common_default_locale_get();
+
+extern int afb_common_rootdir_set(const char *rootdir);
+extern int afb_common_rootdir_get_fd();
+extern int afb_common_rootdir_open_locale(const char *filename, int flags, const char *locale);
+
diff --git a/src/main.c b/src/main.c
index cb44bdfa..ff7daaff 100644
--- a/src/main.c
+++ b/src/main.c
@@ -640,6 +640,11 @@ int main(int argc, char *argv[])  {
      return 1;
   }
 
+  if (afb_common_rootdir_set(config->rootdir) < 0) {
+     ERROR("main fail to set common root directory");
+     return 1;
+  }
+
   // let's run this program with a low priority
   nice (20);
 
@@ -659,6 +664,7 @@ int main(int argc, char *argv[])  {
       INFO("entering foreground mode");
   }
 
+   /* start the HTTP server */
    hsrv = start_http_server(config);
    if (hsrv == NULL)
 	exit(1);