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/* -*- 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
#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