diff options
Diffstat (limited to 'src/core/support/env_linux.c')
| -rw-r--r-- | src/core/support/env_linux.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/core/support/env_linux.c b/src/core/support/env_linux.c index 2e03365e33..b5832a5917 100644 --- a/src/core/support/env_linux.c +++ b/src/core/support/env_linux.c @@ -1,6 +1,6 @@ /* * - * Copyright 2015, Google Inc. + * Copyright 2015-2016, Google Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -49,8 +49,28 @@ #include "src/core/support/string.h" +/* Declare weak symbols for versions of secure_getenv that *may* be + * on a users machine. Older libc's call this __secure_getenv, even + * older don't support the functionality. + * + * If a symbol is not present, these will be equal to NULL. + */ +char *__attribute__((weak)) secure_getenv(const char *name); +char *__attribute__((weak)) __secure_getenv(const char *name); + char *gpr_getenv(const char *name) { - char *result = secure_getenv(name); + static char *(*getenv_func)(const char *) = secure_getenv; + /* Check to see which getenv variant is supported (go from most + * to least secure) */ + if (getenv_func == NULL) { + getenv_func = __secure_getenv; + if (getenv_func == NULL) { + gpr_log(GPR_DEBUG, + "No secure_getenv. Please consider upgrading your libc."); + getenv_func = getenv; + } + } + char *result = getenv_func(name); return result == NULL ? result : gpr_strdup(result); } |