1 files changed, 72 insertions, 0 deletions
diff --git a/src/core/lib/security/credentials/alts/check_gcp_environment.cc b/src/core/lib/security/credentials/alts/check_gcp_environment.cc
new file mode 100644
index 0000000000..96807876cf
--- /dev/null
+++ b/src/core/lib/security/credentials/alts/check_gcp_environment.cc
@@ -0,0 +1,72 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * 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 <grpc/support/port_platform.h>
+
+#include "src/core/lib/security/credentials/alts/check_gcp_environment.h"
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+const size_t kBiosDataBufferSize = 256;
+
+static char* trim(const char* src) {
+  if (src == nullptr) {
+    return nullptr;
+  }
+  char* des = nullptr;
+  size_t start = 0, end = strlen(src) - 1;
+  /* find the last character that is not a whitespace. */
+  while (end != 0 && isspace(src[end])) {
+    end--;
+  }
+  /* find the first character that is not a whitespace. */
+  while (start < strlen(src) && isspace(src[start])) {
+    start++;
+  }
+  if (start <= end) {
+    des = static_cast<char*>(
+        gpr_zalloc(sizeof(char) * (end - start + 2 /* '\0' */)));
+    memcpy(des, src + start, end - start + 1);
+  }
+  return des;
+}
+
+namespace grpc_core {
+namespace internal {
+
+char* read_bios_file(const char* bios_file) {
+  FILE* fp = fopen(bios_file, "r");
+  if (!fp) {
+    gpr_log(GPR_ERROR, "BIOS data file cannot be opened.");
+    return nullptr;
+  }
+  char buf[kBiosDataBufferSize + 1];
+  size_t ret = fread(buf, sizeof(char), kBiosDataBufferSize, fp);
+  buf[ret] = '\0';
+  char* trimmed_buf = trim(buf);
+  fclose(fp);
+  return trimmed_buf;
+}
+
+}  // namespace internal
+}  // namespace grpc_core