userpref: new internal function userpref_get_paired_uuids

2 files changed, 61 insertions, 0 deletions

diff --git a/src/userpref.c b/src/userpref.c
index 59c61b6..6e62000 100644
--- a/src/userpref.c
+++ b/src/userpref.c
@@ -186,6 +186,66 @@ int userpref_has_device_public_key(const char *uuid)
 }
 
 /**
+ * Fills a list with UUIDs of devices that have been connected to this
+ * system before, i.e. for which a public key file exists.
+ *
+ * @param list A pointer to a char** initially pointing to NULL that will
+ *        hold a newly allocated list of UUIDs upon successful return.
+ *        The caller is responsible for freeing the memory. Note that if
+ *        no public key file was found the list has to be freed too as it
+ *        points to a terminating NULL element.
+ * @param count The number of UUIDs found. This parameter can be NULL if it
+ *        is not required.
+ *
+ * @return USERPREF_E_SUCCESS on success, or USERPREF_E_INVALID_ARG if the 
+ *         list parameter is not pointing to NULL.
+ */
+userpref_error_t userpref_get_paired_uuids(char ***list, unsigned int *count)
+{
+        GDir *config_dir;
+        gchar *config_path;
+        const gchar *dir_file;
+        GList *uuids = NULL;
+        unsigned int i;
+        unsigned int found = 0;
+
+        if (!list || (list && *list)) {
+                debug_info("ERROR: The list parameter needs to point to NULL!");
+                return USERPREF_E_INVALID_ARG;
+        }
+
+        if (count) {
+                *count = 0;
+        }
+
+        config_path = g_build_path(G_DIR_SEPARATOR_S, g_get_user_config_dir(), LIBIMOBILEDEVICE_CONF_DIR, NULL);
+
+        config_dir = g_dir_open(config_path,0,NULL);
+        if (config_dir) {
+                while ((dir_file = g_dir_read_name(config_dir))) {
+                        if (g_str_has_suffix(dir_file, ".pem") && (strlen(dir_file) == 44)) {
+                                uuids = g_list_append(uuids, g_strndup(dir_file, strlen(dir_file)-4));
+                                found++;
+                        }
+                }
+                g_dir_close(config_dir);
+        }
+        *list = (char**)malloc(sizeof(char*) * (found+1));
+        for (i = 0; i < found; i++) {
+                (*list)[i] = g_list_nth_data(uuids, i);
+        }
+        (*list)[i] = NULL;
+
+        if (count) {
+                *count = found;
+        }
+        g_list_free(uuids);
+        g_free(config_path);
+
+        return USERPREF_E_SUCCESS;
+}
+
+/**
  * Mark the device (as represented by the key) as having connected to this
  * configuration.
  *
diff --git a/src/userpref.h b/src/userpref.h
index 48b8969..d6952d3 100644
--- a/src/userpref.h
+++ b/src/userpref.h
@@ -40,6 +40,7 @@ G_GNUC_INTERNAL userpref_error_t userpref_get_certs_as_pem(gnutls_datum_t *pem_r
 G_GNUC_INTERNAL userpref_error_t userpref_set_device_public_key(const char *uuid, gnutls_datum_t public_key);
 G_GNUC_INTERNAL userpref_error_t userpref_remove_device_public_key(const char *uuid);
 G_GNUC_INTERNAL int userpref_has_device_public_key(const char *uuid);
+userpref_error_t userpref_get_paired_uuids(char ***list, unsigned int *count);
 G_GNUC_INTERNAL void userpref_get_host_id(char **host_id);
 
 #endif