diff options
Diffstat (limited to 'nsprpub/pr/src/misc/prenv.c')
| -rw-r--r-- | nsprpub/pr/src/misc/prenv.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/nsprpub/pr/src/misc/prenv.c b/nsprpub/pr/src/misc/prenv.c new file mode 100644 index 000000000..cc2e198b9 --- /dev/null +++ b/nsprpub/pr/src/misc/prenv.c @@ -0,0 +1,162 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include <string.h> +#include <stdlib.h> +#include "primpl.h" +#include "prmem.h" + +#if defined(XP_UNIX) +#include <unistd.h> +#if defined(DARWIN) +#if defined(HAVE_CRT_EXTERNS_H) +#include <crt_externs.h> +#endif /* HAVE_CRT_EXTERNS_H */ +#else /* DARWIN */ +PR_IMPORT_DATA(char **) environ; +#endif /* DARWIN */ +#endif /* XP_UNIX */ + +#if !defined(HAVE_SECURE_GETENV) && defined(HAVE___SECURE_GETENV) +#define secure_getenv __secure_getenv +#define HAVE_SECURE_GETENV 1 +#endif + +/* Lock used to lock the environment */ +#if defined(_PR_NO_PREEMPT) +#define _PR_NEW_LOCK_ENV() +#define _PR_DELETE_LOCK_ENV() +#define _PR_LOCK_ENV() +#define _PR_UNLOCK_ENV() +#elif defined(_PR_LOCAL_THREADS_ONLY) +extern _PRCPU * _pr_primordialCPU; +static PRIntn _is; +#define _PR_NEW_LOCK_ENV() +#define _PR_DELETE_LOCK_ENV() +#define _PR_LOCK_ENV() if (_pr_primordialCPU) _PR_INTSOFF(_is); +#define _PR_UNLOCK_ENV() if (_pr_primordialCPU) _PR_INTSON(_is); +#else +static PRLock *_pr_envLock = NULL; +#define _PR_NEW_LOCK_ENV() {_pr_envLock = PR_NewLock();} +#define _PR_DELETE_LOCK_ENV() \ + { if (_pr_envLock) { PR_DestroyLock(_pr_envLock); _pr_envLock = NULL; } } +#define _PR_LOCK_ENV() { if (_pr_envLock) PR_Lock(_pr_envLock); } +#define _PR_UNLOCK_ENV() { if (_pr_envLock) PR_Unlock(_pr_envLock); } +#endif + +/************************************************************************/ + +void _PR_InitEnv(void) +{ + _PR_NEW_LOCK_ENV(); +} + +void _PR_CleanupEnv(void) +{ + _PR_DELETE_LOCK_ENV(); +} + +PR_IMPLEMENT(char*) PR_GetEnv(const char *var) +{ + char *ev; + + if (!_pr_initialized) _PR_ImplicitInitialization(); + + _PR_LOCK_ENV(); + ev = _PR_MD_GET_ENV(var); + _PR_UNLOCK_ENV(); + return ev; +} + +PR_IMPLEMENT(char*) PR_GetEnvSecure(const char *var) +{ +#ifdef HAVE_SECURE_GETENV + char *ev; + + if (!_pr_initialized) _PR_ImplicitInitialization(); + + _PR_LOCK_ENV(); + ev = secure_getenv(var); + _PR_UNLOCK_ENV(); + + return ev; +#else +#ifdef XP_UNIX + /* + ** Fall back to checking uids and gids. This won't detect any other + ** privilege-granting mechanisms the platform may have. This also + ** can't detect the case where the process already called + ** setuid(geteuid()) and/or setgid(getegid()). + */ + if (getuid() != geteuid() || getgid() != getegid()) { + return NULL; + } +#endif /* XP_UNIX */ + return PR_GetEnv(var); +#endif /* HAVE_SECURE_GETENV */ +} + +PR_IMPLEMENT(PRStatus) PR_SetEnv(const char *string) +{ + PRIntn result; + + if (!_pr_initialized) _PR_ImplicitInitialization(); + + if (!strchr(string, '=')) return(PR_FAILURE); + + _PR_LOCK_ENV(); + result = _PR_MD_PUT_ENV((char*)string); + _PR_UNLOCK_ENV(); + return result ? PR_FAILURE : PR_SUCCESS; +} + +#if defined(XP_UNIX) && (!defined(DARWIN) || defined(HAVE_CRT_EXTERNS_H)) +PR_IMPLEMENT(char **) PR_DuplicateEnvironment(void) +{ + char **the_environ, **result, **end, **src, **dst; + + _PR_LOCK_ENV(); +#ifdef DARWIN + the_environ = *(_NSGetEnviron()); +#else + the_environ = environ; +#endif + + for (end = the_environ; *end != NULL; end++) + /* empty loop body */; + + result = (char **)PR_Malloc(sizeof(char *) * (end - the_environ + 1)); + if (result != NULL) { + for (src = the_environ, dst = result; src != end; src++, dst++) { + size_t len; + + len = strlen(*src) + 1; + *dst = PR_Malloc(len); + if (*dst == NULL) { + /* Allocation failed. Must clean up the half-copied env. */ + char **to_delete; + + for (to_delete = result; to_delete != dst; to_delete++) { + PR_Free(*to_delete); + } + PR_Free(result); + result = NULL; + goto out; + } + memcpy(*dst, *src, len); + } + *dst = NULL; + } + out: + _PR_UNLOCK_ENV(); + return result; +} +#else +/* This platform doesn't support raw access to the environ block. */ +PR_IMPLEMENT(char **) PR_DuplicateEnvironment(void) +{ + return NULL; +} +#endif |