--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nss/lib/util/secport.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,718 @@
+/* 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/. */
+
+/*
+ * secport.c - portability interfaces for security libraries
+ *
+ * This file abstracts out libc functionality that libsec depends on
+ * 
+ * NOTE - These are not public interfaces
+ */
+
+#include "seccomon.h"
+#include "prmem.h"
+#include "prerror.h"
+#include "plarena.h"
+#include "secerr.h"
+#include "prmon.h"
+#include "nssilock.h"
+#include "secport.h"
+#include "prenv.h"
+
+#ifdef DEBUG
+#define THREADMARK
+#endif /* DEBUG */
+
+#ifdef THREADMARK
+#include "prthread.h"
+#endif /* THREADMARK */
+
+#if defined(XP_UNIX) || defined(XP_OS2) || defined(XP_BEOS)
+#include <stdlib.h>
+#else
+#include "wtypes.h"
+#endif
+
+#define SET_ERROR_CODE	/* place holder for code to set PR error code. */
+
+#ifdef THREADMARK
+typedef struct threadmark_mark_str {
+  struct threadmark_mark_str *next;
+  void *mark;
+} threadmark_mark;
+
+#endif /* THREADMARK */
+
+/* The value of this magic must change each time PORTArenaPool changes. */
+#define ARENAPOOL_MAGIC 0xB8AC9BDF 
+
+typedef struct PORTArenaPool_str {
+  PLArenaPool arena;
+  PRUint32    magic;
+  PRLock *    lock;
+#ifdef THREADMARK
+  PRThread *marking_thread;
+  threadmark_mark *first_mark;
+#endif
+} PORTArenaPool;
+
+
+/* count of allocation failures. */
+unsigned long port_allocFailures;
+
+/* locations for registering Unicode conversion functions.  
+ * XXX is this the appropriate location?  or should they be
+ *     moved to client/server specific locations?
+ */
+PORTCharConversionFunc ucs4Utf8ConvertFunc;
+PORTCharConversionFunc ucs2Utf8ConvertFunc;
+PORTCharConversionWSwapFunc  ucs2AsciiConvertFunc;
+
+/* NSPR memory allocation functions (PR_Malloc, PR_Calloc, and PR_Realloc)
+ * use the PRUint32 type for the size parameter. Before we pass a size_t or
+ * unsigned long size to these functions, we need to ensure it is <= half of
+ * the maximum PRUint32 value to avoid truncation and catch a negative size.
+ */
+#define MAX_SIZE (PR_UINT32_MAX >> 1)
+
+void *
+PORT_Alloc(size_t bytes)
+{
+    void *rv = NULL;
+
+    if (bytes <= MAX_SIZE) {
+	/* Always allocate a non-zero amount of bytes */
+	rv = PR_Malloc(bytes ? bytes : 1);
+    }
+    if (!rv) {
+	++port_allocFailures;
+	PORT_SetError(SEC_ERROR_NO_MEMORY);
+    }
+    return rv;
+}
+
+void *
+PORT_Realloc(void *oldptr, size_t bytes)
+{
+    void *rv = NULL;
+
+    if (bytes <= MAX_SIZE) {
+	rv = PR_Realloc(oldptr, bytes);
+    }
+    if (!rv) {
+	++port_allocFailures;
+	PORT_SetError(SEC_ERROR_NO_MEMORY);
+    }
+    return rv;
+}
+
+void *
+PORT_ZAlloc(size_t bytes)
+{
+    void *rv = NULL;
+
+    if (bytes <= MAX_SIZE) {
+	/* Always allocate a non-zero amount of bytes */
+	rv = PR_Calloc(1, bytes ? bytes : 1);
+    }
+    if (!rv) {
+	++port_allocFailures;
+	PORT_SetError(SEC_ERROR_NO_MEMORY);
+    }
+    return rv;
+}
+
+void
+PORT_Free(void *ptr)
+{
+    if (ptr) {
+	PR_Free(ptr);
+    }
+}
+
+void
+PORT_ZFree(void *ptr, size_t len)
+{
+    if (ptr) {
+	memset(ptr, 0, len);
+	PR_Free(ptr);
+    }
+}
+
+char *
+PORT_Strdup(const char *str)
+{
+    size_t len = PORT_Strlen(str)+1;
+    char *newstr;
+
+    newstr = (char *)PORT_Alloc(len);
+    if (newstr) {
+        PORT_Memcpy(newstr, str, len);
+    }
+    return newstr;
+}
+
+void
+PORT_SetError(int value)
+{	
+#ifdef DEBUG_jp96085
+    PORT_Assert(value != SEC_ERROR_REUSED_ISSUER_AND_SERIAL);
+#endif
+    PR_SetError(value, 0);
+    return;
+}
+
+int
+PORT_GetError(void)
+{
+    return(PR_GetError());
+}
+
+/********************* Arena code follows *****************************
+ * ArenaPools are like heaps.  The memory in them consists of large blocks,
+ * called arenas, which are allocated from the/a system heap.  Inside an
+ * ArenaPool, the arenas are organized as if they were in a stack.  Newly
+ * allocated arenas are "pushed" on that stack.  When you attempt to
+ * allocate memory from an ArenaPool, the code first looks to see if there
+ * is enough unused space in the top arena on the stack to satisfy your
+ * request, and if so, your request is satisfied from that arena.
+ * Otherwise, a new arena is allocated (or taken from NSPR's list of freed
+ * arenas) and pushed on to the stack.  The new arena is always big enough
+ * to satisfy the request, and is also at least a minimum size that is
+ * established at the time that the ArenaPool is created.
+ *
+ * The ArenaMark function returns the address of a marker in the arena at
+ * the top of the arena stack.  It is the address of the place in the arena
+ * on the top of the arena stack from which the next block of memory will
+ * be allocated.  Each ArenaPool has its own separate stack, and hence
+ * marks are only relevant to the ArenaPool from which they are gotten.
+ * Marks may be nested.  That is, a thread can get a mark, and then get
+ * another mark.
+ *
+ * It is intended that all the marks in an ArenaPool may only be owned by a
+ * single thread.  In DEBUG builds, this is enforced.  In non-DEBUG builds,
+ * it is not.  In DEBUG builds, when a thread gets a mark from an
+ * ArenaPool, no other thread may acquire a mark in that ArenaPool while
+ * that mark exists, that is, until that mark is unmarked or released.
+ * Therefore, it is important that every mark be unmarked or released when
+ * the creating thread has no further need for exclusive ownership of the
+ * right to manage the ArenaPool.
+ *
+ * The ArenaUnmark function discards the ArenaMark at the address given,
+ * and all marks nested inside that mark (that is, acquired from that same
+ * ArenaPool while that mark existed).   It is an error for a thread other
+ * than the mark's creator to try to unmark it.  When a thread has unmarked
+ * all its marks from an ArenaPool, then another thread is able to set
+ * marks in that ArenaPool.  ArenaUnmark does not deallocate (or "pop") any
+ * memory allocated from the ArenaPool since the mark was created.
+ *
+ * ArenaRelease "pops" the stack back to the mark, deallocating all the
+ * memory allocated from the arenas in the ArenaPool since that mark was
+ * created, and removing any arenas from the ArenaPool that have no
+ * remaining active allocations when that is done.  It implicitly releases
+ * any marks nested inside the mark being explicitly released.  It is the
+ * only operation, other than destroying the arenapool, that potentially
+ * reduces the number of arenas on the stack.  Otherwise, the stack grows
+ * until the arenapool is destroyed, at which point all the arenas are
+ * freed or returned to a "free arena list", depending on their sizes.
+ */
+PLArenaPool *
+PORT_NewArena(unsigned long chunksize)
+{
+    PORTArenaPool *pool;
+    
+    if (chunksize > MAX_SIZE) {
+	PORT_SetError(SEC_ERROR_NO_MEMORY);
+	return NULL;
+    }
+    pool = PORT_ZNew(PORTArenaPool);
+    if (!pool) {
+	return NULL;
+    }
+    pool->magic = ARENAPOOL_MAGIC;
+    pool->lock = PZ_NewLock(nssILockArena);
+    if (!pool->lock) {
+	++port_allocFailures;
+	PORT_Free(pool);
+	return NULL;
+    }
+    PL_InitArenaPool(&pool->arena, "security", chunksize, sizeof(double));
+    return(&pool->arena);
+}
+
+void *
+PORT_ArenaAlloc(PLArenaPool *arena, size_t size)
+{
+    void *p = NULL;
+
+    PORTArenaPool *pool = (PORTArenaPool *)arena;
+
+    if (size <= 0) {
+	size = 1;
+    }
+
+    if (size > MAX_SIZE) {
+	/* you lose. */
+    } else 
+    /* Is it one of ours?  Assume so and check the magic */
+    if (ARENAPOOL_MAGIC == pool->magic ) {
+	PZ_Lock(pool->lock);
+#ifdef THREADMARK
+        /* Most likely one of ours.  Is there a thread id? */
+	if (pool->marking_thread  &&
+	    pool->marking_thread != PR_GetCurrentThread() ) {
+	    /* Another thread holds a mark in this arena */
+	    PZ_Unlock(pool->lock);
+	    PORT_SetError(SEC_ERROR_NO_MEMORY);
+	    PORT_Assert(0);
+	    return NULL;
+	} /* tid != null */
+#endif /* THREADMARK */
+	PL_ARENA_ALLOCATE(p, arena, size);
+	PZ_Unlock(pool->lock);
+    } else {
+	PL_ARENA_ALLOCATE(p, arena, size);
+    }
+
+    if (!p) {
+	++port_allocFailures;
+	PORT_SetError(SEC_ERROR_NO_MEMORY);
+    }
+
+    return(p);
+}
+
+void *
+PORT_ArenaZAlloc(PLArenaPool *arena, size_t size)
+{
+    void *p;
+
+    if (size <= 0)
+        size = 1;
+
+    p = PORT_ArenaAlloc(arena, size);
+
+    if (p) {
+	PORT_Memset(p, 0, size);
+    }
+
+    return(p);
+}
+
+/*
+ * If zero is true, zeroize the arena memory before freeing it.
+ */
+void
+PORT_FreeArena(PLArenaPool *arena, PRBool zero)
+{
+    PORTArenaPool *pool = (PORTArenaPool *)arena;
+    PRLock *       lock = (PRLock *)0;
+    size_t         len  = sizeof *arena;
+    static PRBool  checkedEnv = PR_FALSE;
+    static PRBool  doFreeArenaPool = PR_FALSE;
+
+    if (!pool)
+    	return;
+    if (ARENAPOOL_MAGIC == pool->magic ) {
+	len  = sizeof *pool;
+	lock = pool->lock;
+	PZ_Lock(lock);
+    }
+    if (!checkedEnv) {
+	/* no need for thread protection here */
+	doFreeArenaPool = (PR_GetEnv("NSS_DISABLE_ARENA_FREE_LIST") == NULL);
+	checkedEnv = PR_TRUE;
+    }
+    if (zero) {
+	PL_ClearArenaPool(arena, 0);
+    }
+    if (doFreeArenaPool) {
+	PL_FreeArenaPool(arena);
+    } else {
+	PL_FinishArenaPool(arena);
+    }
+    PORT_ZFree(arena, len);
+    if (lock) {
+	PZ_Unlock(lock);
+	PZ_DestroyLock(lock);
+    }
+}
+
+void *
+PORT_ArenaGrow(PLArenaPool *arena, void *ptr, size_t oldsize, size_t newsize)
+{
+    PORTArenaPool *pool = (PORTArenaPool *)arena;
+    PORT_Assert(newsize >= oldsize);
+    
+    if (newsize > MAX_SIZE) {
+	PORT_SetError(SEC_ERROR_NO_MEMORY);
+	return NULL;
+    }
+
+    if (ARENAPOOL_MAGIC == pool->magic ) {
+	PZ_Lock(pool->lock);
+	/* Do we do a THREADMARK check here? */
+	PL_ARENA_GROW(ptr, arena, oldsize, ( newsize - oldsize ) );
+	PZ_Unlock(pool->lock);
+    } else {
+	PL_ARENA_GROW(ptr, arena, oldsize, ( newsize - oldsize ) );
+    }
+    
+    return(ptr);
+}
+
+void *
+PORT_ArenaMark(PLArenaPool *arena)
+{
+    void * result;
+
+    PORTArenaPool *pool = (PORTArenaPool *)arena;
+    if (ARENAPOOL_MAGIC == pool->magic ) {
+	PZ_Lock(pool->lock);
+#ifdef THREADMARK
+	{
+	  threadmark_mark *tm, **pw;
+	  PRThread * currentThread = PR_GetCurrentThread();
+
+	    if (! pool->marking_thread ) {
+		/* First mark */
+		pool->marking_thread = currentThread;
+	    } else if (currentThread != pool->marking_thread ) {
+		PZ_Unlock(pool->lock);
+		PORT_SetError(SEC_ERROR_NO_MEMORY);
+		PORT_Assert(0);
+		return NULL;
+	    }
+
+	    result = PL_ARENA_MARK(arena);
+	    PL_ARENA_ALLOCATE(tm, arena, sizeof(threadmark_mark));
+	    if (!tm) {
+		PZ_Unlock(pool->lock);
+		PORT_SetError(SEC_ERROR_NO_MEMORY);
+		return NULL;
+	    }
+
+	    tm->mark = result;
+	    tm->next = (threadmark_mark *)NULL;
+
+	    pw = &pool->first_mark;
+	    while( *pw ) {
+		 pw = &(*pw)->next;
+	    }
+
+	    *pw = tm;
+	}
+#else /* THREADMARK */
+	result = PL_ARENA_MARK(arena);
+#endif /* THREADMARK */
+	PZ_Unlock(pool->lock);
+    } else {
+	/* a "pure" NSPR arena */
+	result = PL_ARENA_MARK(arena);
+    }
+    return result;
+}
+
+/*
+ * This function accesses the internals of PLArena, which is why it needs
+ * to use the NSPR internal macro PL_MAKE_MEM_UNDEFINED before the memset
+ * calls.
+ *
+ * We should move this function to NSPR as PL_ClearArenaAfterMark or add
+ * a PL_ARENA_CLEAR_AND_RELEASE macro.
+ *
+ * TODO: remove the #ifdef PL_MAKE_MEM_UNDEFINED tests when NSPR 4.10+ is
+ * widely available.
+ */
+static void
+port_ArenaZeroAfterMark(PLArenaPool *arena, void *mark)
+{
+    PLArena *a = arena->current;
+    if (a->base <= (PRUword)mark && (PRUword)mark <= a->avail) {
+	/* fast path: mark falls in the current arena */
+#ifdef PL_MAKE_MEM_UNDEFINED
+	PL_MAKE_MEM_UNDEFINED(mark, a->avail - (PRUword)mark);
+#endif
+	memset(mark, 0, a->avail - (PRUword)mark);
+    } else {
+	/* slow path: need to find the arena that mark falls in */
+	for (a = arena->first.next; a; a = a->next) {
+	    PR_ASSERT(a->base <= a->avail && a->avail <= a->limit);
+	    if (a->base <= (PRUword)mark && (PRUword)mark <= a->avail) {
+#ifdef PL_MAKE_MEM_UNDEFINED
+		PL_MAKE_MEM_UNDEFINED(mark, a->avail - (PRUword)mark);
+#endif
+		memset(mark, 0, a->avail - (PRUword)mark);
+		a = a->next;
+		break;
+	    }
+	}
+	for (; a; a = a->next) {
+	    PR_ASSERT(a->base <= a->avail && a->avail <= a->limit);
+#ifdef PL_MAKE_MEM_UNDEFINED
+	    PL_MAKE_MEM_UNDEFINED((void *)a->base, a->avail - a->base);
+#endif
+	    memset((void *)a->base, 0, a->avail - a->base);
+	}
+    }
+}
+
+static void
+port_ArenaRelease(PLArenaPool *arena, void *mark, PRBool zero)
+{
+    PORTArenaPool *pool = (PORTArenaPool *)arena;
+    if (ARENAPOOL_MAGIC == pool->magic ) {
+	PZ_Lock(pool->lock);
+#ifdef THREADMARK
+	{
+	    threadmark_mark **pw, *tm;
+
+	    if (PR_GetCurrentThread() != pool->marking_thread ) {
+		PZ_Unlock(pool->lock);
+		PORT_SetError(SEC_ERROR_NO_MEMORY);
+		PORT_Assert(0);
+		return /* no error indication available */ ;
+	    }
+
+	    pw = &pool->first_mark;
+	    while( *pw && (mark != (*pw)->mark) ) {
+		pw = &(*pw)->next;
+	    }
+
+	    if (! *pw ) {
+		/* bad mark */
+		PZ_Unlock(pool->lock);
+		PORT_SetError(SEC_ERROR_NO_MEMORY);
+		PORT_Assert(0);
+		return /* no error indication available */ ;
+	    }
+
+	    tm = *pw;
+	    *pw = (threadmark_mark *)NULL;
+
+	    if (zero) {
+		port_ArenaZeroAfterMark(arena, mark);
+	    }
+	    PL_ARENA_RELEASE(arena, mark);
+
+	    if (! pool->first_mark ) {
+		pool->marking_thread = (PRThread *)NULL;
+	    }
+	}
+#else /* THREADMARK */
+	if (zero) {
+	    port_ArenaZeroAfterMark(arena, mark);
+	}
+	PL_ARENA_RELEASE(arena, mark);
+#endif /* THREADMARK */
+	PZ_Unlock(pool->lock);
+    } else {
+	if (zero) {
+	    port_ArenaZeroAfterMark(arena, mark);
+	}
+	PL_ARENA_RELEASE(arena, mark);
+    }
+}
+
+void
+PORT_ArenaRelease(PLArenaPool *arena, void *mark)
+{
+    port_ArenaRelease(arena, mark, PR_FALSE);
+}
+
+/*
+ * Zeroize the arena memory before releasing it.
+ */
+void
+PORT_ArenaZRelease(PLArenaPool *arena, void *mark)
+{
+    port_ArenaRelease(arena, mark, PR_TRUE);
+}
+
+void
+PORT_ArenaUnmark(PLArenaPool *arena, void *mark)
+{
+#ifdef THREADMARK
+    PORTArenaPool *pool = (PORTArenaPool *)arena;
+    if (ARENAPOOL_MAGIC == pool->magic ) {
+	threadmark_mark **pw, *tm;
+
+	PZ_Lock(pool->lock);
+
+	if (PR_GetCurrentThread() != pool->marking_thread ) {
+	    PZ_Unlock(pool->lock);
+	    PORT_SetError(SEC_ERROR_NO_MEMORY);
+	    PORT_Assert(0);
+	    return /* no error indication available */ ;
+	}
+
+	pw = &pool->first_mark;
+	while( ((threadmark_mark *)NULL != *pw) && (mark != (*pw)->mark) ) {
+	    pw = &(*pw)->next;
+	}
+
+	if ((threadmark_mark *)NULL == *pw ) {
+	    /* bad mark */
+	    PZ_Unlock(pool->lock);
+	    PORT_SetError(SEC_ERROR_NO_MEMORY);
+	    PORT_Assert(0);
+	    return /* no error indication available */ ;
+	}
+
+	tm = *pw;
+	*pw = (threadmark_mark *)NULL;
+
+	if (! pool->first_mark ) {
+	    pool->marking_thread = (PRThread *)NULL;
+	}
+
+	PZ_Unlock(pool->lock);
+    }
+#endif /* THREADMARK */
+}
+
+char *
+PORT_ArenaStrdup(PLArenaPool *arena, const char *str) {
+    int len = PORT_Strlen(str)+1;
+    char *newstr;
+
+    newstr = (char*)PORT_ArenaAlloc(arena,len);
+    if (newstr) {
+        PORT_Memcpy(newstr,str,len);
+    }
+    return newstr;
+}
+
+/********************** end of arena functions ***********************/
+
+/****************** unicode conversion functions ***********************/
+/*
+ * NOTE: These conversion functions all assume that the multibyte
+ * characters are going to be in NETWORK BYTE ORDER, not host byte
+ * order.  This is because the only time we deal with UCS-2 and UCS-4
+ * are when the data was received from or is going to be sent out
+ * over the wire (in, e.g. certificates).
+ */
+
+void
+PORT_SetUCS4_UTF8ConversionFunction(PORTCharConversionFunc convFunc)
+{ 
+    ucs4Utf8ConvertFunc = convFunc;
+}
+
+void
+PORT_SetUCS2_ASCIIConversionFunction(PORTCharConversionWSwapFunc convFunc)
+{ 
+    ucs2AsciiConvertFunc = convFunc;
+}
+
+void
+PORT_SetUCS2_UTF8ConversionFunction(PORTCharConversionFunc convFunc)
+{ 
+    ucs2Utf8ConvertFunc = convFunc;
+}
+
+PRBool 
+PORT_UCS4_UTF8Conversion(PRBool toUnicode, unsigned char *inBuf,
+			 unsigned int inBufLen, unsigned char *outBuf,
+			 unsigned int maxOutBufLen, unsigned int *outBufLen)
+{
+    if(!ucs4Utf8ConvertFunc) {
+      return sec_port_ucs4_utf8_conversion_function(toUnicode,
+        inBuf, inBufLen, outBuf, maxOutBufLen, outBufLen);
+    }
+
+    return (*ucs4Utf8ConvertFunc)(toUnicode, inBuf, inBufLen, outBuf, 
+				  maxOutBufLen, outBufLen);
+}
+
+PRBool 
+PORT_UCS2_UTF8Conversion(PRBool toUnicode, unsigned char *inBuf,
+			 unsigned int inBufLen, unsigned char *outBuf,
+			 unsigned int maxOutBufLen, unsigned int *outBufLen)
+{
+    if(!ucs2Utf8ConvertFunc) {
+      return sec_port_ucs2_utf8_conversion_function(toUnicode,
+        inBuf, inBufLen, outBuf, maxOutBufLen, outBufLen);
+    }
+
+    return (*ucs2Utf8ConvertFunc)(toUnicode, inBuf, inBufLen, outBuf, 
+				  maxOutBufLen, outBufLen);
+}
+
+PRBool 
+PORT_ISO88591_UTF8Conversion(const unsigned char *inBuf,
+			 unsigned int inBufLen, unsigned char *outBuf,
+			 unsigned int maxOutBufLen, unsigned int *outBufLen)
+{
+    return sec_port_iso88591_utf8_conversion_function(inBuf, inBufLen,
+      outBuf, maxOutBufLen, outBufLen);
+}
+
+PRBool 
+PORT_UCS2_ASCIIConversion(PRBool toUnicode, unsigned char *inBuf,
+			  unsigned int inBufLen, unsigned char *outBuf,
+			  unsigned int maxOutBufLen, unsigned int *outBufLen,
+			  PRBool swapBytes)
+{
+    if(!ucs2AsciiConvertFunc) {
+	return PR_FALSE;
+    }
+
+    return (*ucs2AsciiConvertFunc)(toUnicode, inBuf, inBufLen, outBuf, 
+				  maxOutBufLen, outBufLen, swapBytes);
+}
+
+
+/* Portable putenv.  Creates/replaces an environment variable of the form
+ *  envVarName=envValue
+ */
+int
+NSS_PutEnv(const char * envVarName, const char * envValue)
+{
+    SECStatus result = SECSuccess;
+    char *    encoded;
+    int       putEnvFailed;
+#ifdef _WIN32
+    PRBool      setOK;
+
+    setOK = SetEnvironmentVariable(envVarName, envValue);
+    if (!setOK) {
+        SET_ERROR_CODE
+        return SECFailure;
+    }
+#endif
+
+    encoded = (char *)PORT_ZAlloc(strlen(envVarName) + 2 + strlen(envValue));
+    strcpy(encoded, envVarName);
+    strcat(encoded, "=");
+    strcat(encoded, envValue);
+
+    putEnvFailed = putenv(encoded); /* adopt. */
+    if (putEnvFailed) {
+        SET_ERROR_CODE
+        result = SECFailure;
+        PORT_Free(encoded);
+    }
+    return result;
+}
+
+/*
+ * Perform a constant-time compare of two memory regions. The return value is
+ * 0 if the memory regions are equal and non-zero otherwise.
+ */
+int
+NSS_SecureMemcmp(const void *ia, const void *ib, size_t n)
+{
+    const unsigned char *a = (const unsigned char*) ia;
+    const unsigned char *b = (const unsigned char*) ib;
+    size_t i;
+    unsigned char r = 0;
+
+    for (i = 0; i < n; ++i) {
+        r |= *a++ ^ *b++;
+    }
+
+    return r;
+}