1 files changed, 82 insertions, 0 deletions
diff --git a/src/core/lib/support/env_linux.cc b/src/core/lib/support/env_linux.cc
new file mode 100644
index 0000000000..4c45a977ca
--- /dev/null
+++ b/src/core/lib/support/env_linux.cc
@@ -0,0 +1,82 @@
+/*
+ *
+ * Copyright 2015 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.
+ *
+ */
+
+/* for secure_getenv. */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_LINUX_ENV
+
+#include "src/core/lib/support/env.h"
+
+#include <dlfcn.h>
+#include <features.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/lib/support/string.h"
+
+const char *gpr_getenv_silent(const char *name, char **dst) {
+  const char *insecure_func_used = NULL;
+  char *result = NULL;
+#if defined(GPR_BACKWARDS_COMPATIBILITY_MODE)
+  typedef char *(*getenv_type)(const char *);
+  static getenv_type getenv_func = NULL;
+  /* Check to see which getenv variant is supported (go from most
+   * to least secure) */
+  const char *names[] = {"secure_getenv", "__secure_getenv", "getenv"};
+  for (size_t i = 0; getenv_func == NULL && i < GPR_ARRAY_SIZE(names); i++) {
+    getenv_func = (getenv_type)dlsym(RTLD_DEFAULT, names[i]);
+    if (getenv_func != NULL && strstr(names[i], "secure") == NULL) {
+      insecure_func_used = names[i];
+    }
+  }
+  result = getenv_func(name);
+#elif __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17)
+  result = secure_getenv(name);
+#else
+  result = getenv(name);
+  insecure_func_used = "getenv";
+#endif
+  *dst = result == NULL ? result : gpr_strdup(result);
+  return insecure_func_used;
+}
+
+char *gpr_getenv(const char *name) {
+  char *result = NULL;
+  const char *insecure_func_used = gpr_getenv_silent(name, &result);
+  if (insecure_func_used != NULL) {
+    gpr_log(GPR_DEBUG, "Warning: insecure environment read function '%s' used",
+            insecure_func_used);
+  }
+  return result;
+}
+
+void gpr_setenv(const char *name, const char *value) {
+  int res = setenv(name, value, 1);
+  GPR_ASSERT(res == 0);
+}
+
+#endif /* GPR_LINUX_ENV */