+__attribute__((format (printf, 2, 3)))
+static enum vjson_state vjson_error(char **b, const char *fmt, ...)
+{
+ static char buf[256] = { 0 };
+ const char *pfx = "Firmware image couldn't be validated: ";
+ va_list va;
+ int r;
+
+ r = snprintf(buf, sizeof(buf), "%s", pfx);
+ if (r < 0) {
+ *b = "vjson_error() snprintf failed";
+ return VJSON_ERROR;
+ }
+
+ va_start(va, fmt);
+ r = vsnprintf(buf+r, sizeof(buf)-r, fmt, va);
+ if (r < 0) {
+ *b = "vjson_error() vsnprintf failed";
+ return VJSON_ERROR;
+ }
+ va_end(va);
+
+ *b = buf;
+ return VJSON_ERROR;
+}
+
+static enum vjson_state vjson_parse_token(json_tokener *tok, char *buf, ssize_t len, char **err)
+{
+ json_object *jsobj = NULL;
+
+ jsobj = json_tokener_parse_ex(tok, buf, len);
+ if (json_tokener_get_error(tok) == json_tokener_continue)
+ return VJSON_CONTINUE;
+
+ if (json_tokener_get_error(tok) == json_tokener_success) {
+ if (json_object_get_type(jsobj) != json_type_object) {
+ json_object_put(jsobj);
+ return vjson_error(err, "result is not an JSON object");
+ }
+
+ blobmsg_add_object(&b, jsobj);
+ json_object_put(jsobj);
+ return VJSON_SUCCESS;
+ }
+
+ return vjson_error(err, "failed to parse JSON: %s (%d)",
+ json_tokener_error_desc(json_tokener_get_error(tok)),
+ json_tokener_get_error(tok));
+}
+
+static enum vjson_state vjson_parse(int fd, char **err)
+{
+ enum vjson_state r = VJSON_ERROR;
+ size_t read_count = 0;
+ char buf[64] = { 0 };
+ json_tokener *tok;
+ ssize_t len;
+ int _errno;
+
+ tok = json_tokener_new();
+ if (!tok)
+ return vjson_error(err, "json_tokener_new() failed");
+
+ vjson_error(err, "incomplete JSON input");
+
+ while ((len = read(fd, buf, sizeof(buf)))) {
+ if (len < 0 && errno == EINTR)
+ continue;
+
+ if (len < 0) {
+ _errno = errno;
+ json_tokener_free(tok);
+ return vjson_error(err, "read() failed: %s (%d)",
+ strerror(_errno), _errno);
+ }
+
+ read_count += len;
+ r = vjson_parse_token(tok, buf, len, err);
+ if (r != VJSON_CONTINUE)
+ break;
+
+ memset(buf, 0, sizeof(buf));
+ }
+
+ if (read_count == 0)
+ vjson_error(err, "no JSON input");
+
+ json_tokener_free(tok);
+ return r;
+}
+
+/**
+ * validate_firmware_image_call - perform validation & store result in global b
+ *
+ * @file: firmware image path
+ */
+static enum vjson_state validate_firmware_image_call(const char *file, char **err)
+{
+ const char *path = "/usr/libexec/validate_firmware_image";
+ enum vjson_state ret = VJSON_ERROR;
+ int _errno;
+ int fds[2];
+ int fd;
+
+ blob_buf_init(&b, 0);
+ vjson_error(err, "unhandled error");
+
+ if (pipe(fds)) {
+ _errno = errno;
+ return vjson_error(err, "pipe() failed: %s (%d)",
+ strerror(_errno), _errno);
+ }
+
+ switch (fork()) {
+ case -1:
+ _errno = errno;
+
+ close(fds[0]);
+ close(fds[1]);
+
+ return vjson_error(err, "fork() failed: %s (%d)",
+ strerror(_errno), _errno);
+ case 0:
+ /* Set stdin & stderr to /dev/null */
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ dup2(fd, 0);
+ dup2(fd, 2);
+ close(fd);
+ }
+
+ /* Set stdout to the shared pipe */
+ dup2(fds[1], 1);
+ close(fds[0]);
+ close(fds[1]);
+
+ execl(path, path, file, NULL);
+ exit(errno);
+ }
+
+ /* Parent process */
+ close(fds[1]);
+
+ ret = vjson_parse(fds[0], err);
+ close(fds[0]);
+
+ return ret;
+}
+
+enum {
+ VALIDATE_FIRMWARE_IMAGE_PATH,
+ __VALIDATE_FIRMWARE_IMAGE_MAX,
+};
+
+static const struct blobmsg_policy validate_firmware_image_policy[__VALIDATE_FIRMWARE_IMAGE_MAX] = {
+ [VALIDATE_FIRMWARE_IMAGE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
+};
+
+static int validate_firmware_image(struct ubus_context *ctx,
+ struct ubus_object *obj,
+ struct ubus_request_data *req,
+ const char *method, struct blob_attr *msg)
+{
+ struct blob_attr *tb[__VALIDATE_FIRMWARE_IMAGE_MAX];
+ enum vjson_state ret = VJSON_ERROR;
+ char *err;
+
+ if (!msg)
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ blobmsg_parse(validate_firmware_image_policy, __VALIDATE_FIRMWARE_IMAGE_MAX, tb, blob_data(msg), blob_len(msg));
+ if (!tb[VALIDATE_FIRMWARE_IMAGE_PATH])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ ret = validate_firmware_image_call(blobmsg_get_string(tb[VALIDATE_FIRMWARE_IMAGE_PATH]), &err);
+ if (ret != VJSON_SUCCESS)
+ return UBUS_STATUS_UNKNOWN_ERROR;
+
+ ubus_send_reply(ctx, req, b.head);
+
+ return UBUS_STATUS_OK;
+}
+