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-rw-r--r--security/nss/lib/ssl/sslmutex.c658
1 files changed, 658 insertions, 0 deletions
diff --git a/security/nss/lib/ssl/sslmutex.c b/security/nss/lib/ssl/sslmutex.c
new file mode 100644
index 0000000000..0e3c37f072
--- /dev/null
+++ b/security/nss/lib/ssl/sslmutex.c
@@ -0,0 +1,658 @@
+/* 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 "seccomon.h"
+/* This ifdef should match the one in sslsnce.c */
+#if defined(XP_UNIX) || defined(XP_WIN32) || defined(XP_OS2)
+
+#include "sslmutex.h"
+#include "prerr.h"
+
+static SECStatus
+single_process_sslMutex_Init(sslMutex* pMutex)
+{
+ PR_ASSERT(pMutex != 0 && pMutex->u.sslLock == 0);
+
+ pMutex->u.sslLock = PR_NewLock();
+ if (!pMutex->u.sslLock) {
+ return SECFailure;
+ }
+ return SECSuccess;
+}
+
+static SECStatus
+single_process_sslMutex_Destroy(sslMutex* pMutex)
+{
+ PR_ASSERT(pMutex != 0);
+ PR_ASSERT(pMutex->u.sslLock != 0);
+ if (!pMutex->u.sslLock) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ PR_DestroyLock(pMutex->u.sslLock);
+ return SECSuccess;
+}
+
+static SECStatus
+single_process_sslMutex_Unlock(sslMutex* pMutex)
+{
+ PR_ASSERT(pMutex != 0);
+ PR_ASSERT(pMutex->u.sslLock != 0);
+ if (!pMutex->u.sslLock) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ PR_Unlock(pMutex->u.sslLock);
+ return SECSuccess;
+}
+
+static SECStatus
+single_process_sslMutex_Lock(sslMutex* pMutex)
+{
+ PR_ASSERT(pMutex != 0);
+ PR_ASSERT(pMutex->u.sslLock != 0);
+ if (!pMutex->u.sslLock) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ PR_Lock(pMutex->u.sslLock);
+ return SECSuccess;
+}
+
+#if defined(LINUX) || defined(AIX) || defined(BSDI) || \
+ (defined(NETBSD) && __NetBSD_Version__ < 500000000) || defined(OPENBSD) || defined(__GLIBC__)
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include "unix_err.h"
+#include "pratom.h"
+
+#define SSL_MUTEX_MAGIC 0xfeedfd
+#define NONBLOCKING_POSTS 1 /* maybe this is faster */
+
+#if NONBLOCKING_POSTS
+
+#ifndef FNONBLOCK
+#define FNONBLOCK O_NONBLOCK
+#endif
+
+static int
+setNonBlocking(int fd, int nonBlocking)
+{
+ int flags;
+ int err;
+
+ flags = fcntl(fd, F_GETFL, 0);
+ if (0 > flags)
+ return flags;
+ if (nonBlocking)
+ flags |= FNONBLOCK;
+ else
+ flags &= ~FNONBLOCK;
+ err = fcntl(fd, F_SETFL, flags);
+ return err;
+}
+#endif
+
+SECStatus
+sslMutex_Init(sslMutex* pMutex, int shared)
+{
+ int err;
+ PR_ASSERT(pMutex);
+ pMutex->isMultiProcess = (PRBool)(shared != 0);
+ if (!shared) {
+ return single_process_sslMutex_Init(pMutex);
+ }
+ pMutex->u.pipeStr.mPipes[0] = -1;
+ pMutex->u.pipeStr.mPipes[1] = -1;
+ pMutex->u.pipeStr.mPipes[2] = -1;
+ pMutex->u.pipeStr.nWaiters = 0;
+
+ err = pipe(pMutex->u.pipeStr.mPipes);
+ if (err) {
+ nss_MD_unix_map_default_error(errno);
+ return err;
+ }
+#if NONBLOCKING_POSTS
+ err = setNonBlocking(pMutex->u.pipeStr.mPipes[1], 1);
+ if (err)
+ goto loser;
+#endif
+
+ pMutex->u.pipeStr.mPipes[2] = SSL_MUTEX_MAGIC;
+
+#if defined(LINUX) && defined(i386)
+ /* Pipe starts out empty */
+ return SECSuccess;
+#else
+ /* Pipe starts with one byte. */
+ return sslMutex_Unlock(pMutex);
+#endif
+
+loser:
+ nss_MD_unix_map_default_error(errno);
+ close(pMutex->u.pipeStr.mPipes[0]);
+ close(pMutex->u.pipeStr.mPipes[1]);
+ return SECFailure;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex* pMutex, PRBool processLocal)
+{
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Destroy(pMutex);
+ }
+ if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ close(pMutex->u.pipeStr.mPipes[0]);
+ close(pMutex->u.pipeStr.mPipes[1]);
+
+ if (processLocal) {
+ return SECSuccess;
+ }
+
+ pMutex->u.pipeStr.mPipes[0] = -1;
+ pMutex->u.pipeStr.mPipes[1] = -1;
+ pMutex->u.pipeStr.mPipes[2] = -1;
+ pMutex->u.pipeStr.nWaiters = 0;
+
+ return SECSuccess;
+}
+
+#if defined(LINUX) && defined(i386)
+/* No memory barrier needed for this platform */
+
+/* nWaiters includes the holder of the lock (if any) and the number
+** threads waiting for it. After incrementing nWaiters, if the count
+** is exactly 1, then you have the lock and may proceed. If the
+** count is greater than 1, then you must wait on the pipe.
+*/
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+ PRInt32 newValue;
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Unlock(pMutex);
+ }
+
+ if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ /* Do Memory Barrier here. */
+ newValue = PR_ATOMIC_DECREMENT(&pMutex->u.pipeStr.nWaiters);
+ if (newValue > 0) {
+ int cc;
+ char c = 1;
+ do {
+ cc = write(pMutex->u.pipeStr.mPipes[1], &c, 1);
+ } while (cc < 0 && (errno == EINTR || errno == EAGAIN));
+ if (cc != 1) {
+ if (cc < 0)
+ nss_MD_unix_map_default_error(errno);
+ else
+ PORT_SetError(PR_UNKNOWN_ERROR);
+ return SECFailure;
+ }
+ }
+ return SECSuccess;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+ PRInt32 newValue;
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Lock(pMutex);
+ }
+
+ if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ newValue = PR_ATOMIC_INCREMENT(&pMutex->u.pipeStr.nWaiters);
+ /* Do Memory Barrier here. */
+ if (newValue > 1) {
+ int cc;
+ char c;
+ do {
+ cc = read(pMutex->u.pipeStr.mPipes[0], &c, 1);
+ } while (cc < 0 && errno == EINTR);
+ if (cc != 1) {
+ if (cc < 0)
+ nss_MD_unix_map_default_error(errno);
+ else
+ PORT_SetError(PR_UNKNOWN_ERROR);
+ return SECFailure;
+ }
+ }
+ return SECSuccess;
+}
+
+#else
+
+/* Using Atomic operations requires the use of a memory barrier instruction
+** on PowerPC, Sparc, and Alpha. NSPR's PR_Atomic functions do not perform
+** them, and NSPR does not provide a function that does them (e.g. PR_Barrier).
+** So, we don't use them on those platforms.
+*/
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+ int cc;
+ char c = 1;
+
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Unlock(pMutex);
+ }
+
+ if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ do {
+ cc = write(pMutex->u.pipeStr.mPipes[1], &c, 1);
+ } while (cc < 0 && (errno == EINTR || errno == EAGAIN));
+ if (cc != 1) {
+ if (cc < 0)
+ nss_MD_unix_map_default_error(errno);
+ else
+ PORT_SetError(PR_UNKNOWN_ERROR);
+ return SECFailure;
+ }
+
+ return SECSuccess;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+ int cc;
+ char c;
+
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Lock(pMutex);
+ }
+
+ if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+
+ do {
+ cc = read(pMutex->u.pipeStr.mPipes[0], &c, 1);
+ } while (cc < 0 && errno == EINTR);
+ if (cc != 1) {
+ if (cc < 0)
+ nss_MD_unix_map_default_error(errno);
+ else
+ PORT_SetError(PR_UNKNOWN_ERROR);
+ return SECFailure;
+ }
+
+ return SECSuccess;
+}
+
+#endif
+
+#elif defined(WIN32)
+
+#include "win32err.h"
+
+/* on Windows, we need to find the optimal type of locking mechanism to use
+ for the sslMutex.
+
+ There are 3 cases :
+ 1) single-process, use a PRLock, as for all other platforms
+ 2) Win95 multi-process, use a Win32 mutex
+ 3) on WINNT multi-process, use a PRLock + a Win32 mutex
+
+*/
+
+#ifdef WINNT
+
+SECStatus
+sslMutex_2LevelInit(sslMutex *sem)
+{
+ /* the following adds a PRLock to sslMutex . This is done in each
+ process of a multi-process server and is only needed on WINNT, if
+ using fibers. We can't tell if native threads or fibers are used, so
+ we always do it on WINNT
+ */
+ PR_ASSERT(sem);
+ if (sem) {
+ /* we need to reset the sslLock in the children or the single_process init
+ function below will assert */
+ sem->u.sslLock = NULL;
+ }
+ return single_process_sslMutex_Init(sem);
+}
+
+static SECStatus
+sslMutex_2LevelDestroy(sslMutex *sem)
+{
+ return single_process_sslMutex_Destroy(sem);
+}
+
+#endif
+
+SECStatus
+sslMutex_Init(sslMutex *pMutex, int shared)
+{
+#ifdef WINNT
+ SECStatus retvalue;
+#endif
+ HANDLE hMutex;
+ SECURITY_ATTRIBUTES attributes = { sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
+
+ PR_ASSERT(pMutex != 0 && (pMutex->u.sslMutx == 0 ||
+ pMutex->u.sslMutx ==
+ INVALID_HANDLE_VALUE));
+
+ pMutex->isMultiProcess = (PRBool)(shared != 0);
+
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Init(pMutex);
+ }
+
+#ifdef WINNT
+ /* we need a lock on WINNT for fibers in the parent process */
+ retvalue = sslMutex_2LevelInit(pMutex);
+ if (SECSuccess != retvalue)
+ return SECFailure;
+#endif
+
+ if (!pMutex || ((hMutex = pMutex->u.sslMutx) != 0 &&
+ hMutex !=
+ INVALID_HANDLE_VALUE)) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ attributes.bInheritHandle = (shared ? TRUE : FALSE);
+ hMutex = CreateMutex(&attributes, FALSE, NULL);
+ if (hMutex == NULL) {
+ hMutex = INVALID_HANDLE_VALUE;
+ nss_MD_win32_map_default_error(GetLastError());
+ return SECFailure;
+ }
+ pMutex->u.sslMutx = hMutex;
+ return SECSuccess;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex *pMutex, PRBool processLocal)
+{
+ HANDLE hMutex;
+ int rv;
+ int retvalue = SECSuccess;
+
+ PR_ASSERT(pMutex != 0);
+ if (!pMutex) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Destroy(pMutex);
+ }
+
+/* multi-process mode */
+#ifdef WINNT
+ /* on NT, get rid of the PRLock used for fibers within a process */
+ retvalue = sslMutex_2LevelDestroy(pMutex);
+#endif
+
+ PR_ASSERT(pMutex->u.sslMutx != 0 &&
+ pMutex->u.sslMutx != INVALID_HANDLE_VALUE);
+ if ((hMutex = pMutex->u.sslMutx) == 0 || hMutex == INVALID_HANDLE_VALUE) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+
+ rv = CloseHandle(hMutex); /* ignore error */
+ if (!processLocal && rv) {
+ pMutex->u.sslMutx = hMutex = INVALID_HANDLE_VALUE;
+ }
+ if (!rv) {
+ nss_MD_win32_map_default_error(GetLastError());
+ retvalue = SECFailure;
+ }
+ return retvalue;
+}
+
+int
+sslMutex_Unlock(sslMutex *pMutex)
+{
+ BOOL success = FALSE;
+ HANDLE hMutex;
+
+ PR_ASSERT(pMutex != 0);
+ if (!pMutex) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Unlock(pMutex);
+ }
+
+ PR_ASSERT(pMutex->u.sslMutx != 0 &&
+ pMutex->u.sslMutx != INVALID_HANDLE_VALUE);
+ if ((hMutex = pMutex->u.sslMutx) == 0 || hMutex == INVALID_HANDLE_VALUE) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+ success = ReleaseMutex(hMutex);
+ if (!success) {
+ nss_MD_win32_map_default_error(GetLastError());
+ return SECFailure;
+ }
+#ifdef WINNT
+ return single_process_sslMutex_Unlock(pMutex);
+/* release PRLock for other fibers in the process */
+#else
+ return SECSuccess;
+#endif
+}
+
+int
+sslMutex_Lock(sslMutex *pMutex)
+{
+ HANDLE hMutex;
+ DWORD event;
+ DWORD lastError;
+ SECStatus rv;
+ SECStatus retvalue = SECSuccess;
+
+ PR_ASSERT(pMutex != 0);
+ if (!pMutex) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure;
+ }
+
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Lock(pMutex);
+ }
+#ifdef WINNT
+ /* lock first to preserve from other threads/fibers in the same process */
+ retvalue = single_process_sslMutex_Lock(pMutex);
+#endif
+ PR_ASSERT(pMutex->u.sslMutx != 0 &&
+ pMutex->u.sslMutx != INVALID_HANDLE_VALUE);
+ if ((hMutex = pMutex->u.sslMutx) == 0 || hMutex == INVALID_HANDLE_VALUE) {
+ PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+ return SECFailure; /* what else ? */
+ }
+ /* acquire the mutex to be the only owner accross all other processes */
+ event = WaitForSingleObject(hMutex, INFINITE);
+ switch (event) {
+ case WAIT_OBJECT_0:
+ case WAIT_ABANDONED:
+ rv = SECSuccess;
+ break;
+
+ case WAIT_TIMEOUT:
+#if defined(WAIT_IO_COMPLETION)
+ case WAIT_IO_COMPLETION:
+#endif
+ default: /* should never happen. nothing we can do. */
+ PR_ASSERT(PR_FALSE && "WaitForSingleObject returned invalid value.");
+ PORT_SetError(PR_UNKNOWN_ERROR);
+ rv = SECFailure;
+ break;
+
+ case WAIT_FAILED: /* failure returns this */
+ rv = SECFailure;
+ lastError = GetLastError(); /* for debugging */
+ nss_MD_win32_map_default_error(lastError);
+ break;
+ }
+
+ if (!(SECSuccess == retvalue && SECSuccess == rv)) {
+ return SECFailure;
+ }
+
+ return SECSuccess;
+}
+
+#elif defined(XP_UNIX) && !defined(DARWIN)
+
+#include <errno.h>
+#include "unix_err.h"
+
+SECStatus
+sslMutex_Init(sslMutex* pMutex, int shared)
+{
+ int rv;
+ PR_ASSERT(pMutex);
+ pMutex->isMultiProcess = (PRBool)(shared != 0);
+ if (!shared) {
+ return single_process_sslMutex_Init(pMutex);
+ }
+ do {
+ rv = sem_init(&pMutex->u.sem, shared, 1);
+ } while (rv < 0 && errno == EINTR);
+ if (rv < 0) {
+ nss_MD_unix_map_default_error(errno);
+ return SECFailure;
+ }
+ return SECSuccess;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex* pMutex, PRBool processLocal)
+{
+ int rv;
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Destroy(pMutex);
+ }
+
+ /* semaphores are global resources. See SEM_DESTROY(3) man page */
+ if (processLocal) {
+ return SECSuccess;
+ }
+ do {
+ rv = sem_destroy(&pMutex->u.sem);
+ } while (rv < 0 && errno == EINTR);
+ if (rv < 0) {
+ nss_MD_unix_map_default_error(errno);
+ return SECFailure;
+ }
+ return SECSuccess;
+}
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+ int rv;
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Unlock(pMutex);
+ }
+ do {
+ rv = sem_post(&pMutex->u.sem);
+ } while (rv < 0 && errno == EINTR);
+ if (rv < 0) {
+ nss_MD_unix_map_default_error(errno);
+ return SECFailure;
+ }
+ return SECSuccess;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+ int rv;
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Lock(pMutex);
+ }
+ do {
+ rv = sem_wait(&pMutex->u.sem);
+ } while (rv < 0 && errno == EINTR);
+ if (rv < 0) {
+ nss_MD_unix_map_default_error(errno);
+ return SECFailure;
+ }
+ return SECSuccess;
+}
+
+#else
+
+SECStatus
+sslMutex_Init(sslMutex* pMutex, int shared)
+{
+ PR_ASSERT(pMutex);
+ pMutex->isMultiProcess = (PRBool)(shared != 0);
+ if (!shared) {
+ return single_process_sslMutex_Init(pMutex);
+ }
+ PORT_Assert(PR_FALSE && "sslMutex_Init not implemented for multi-process applications !");
+ PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+ return SECFailure;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex* pMutex, PRBool processLocal)
+{
+ PR_ASSERT(pMutex);
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Destroy(pMutex);
+ }
+ PORT_Assert(PR_FALSE && "sslMutex_Destroy not implemented for multi-process applications !");
+ PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+ return SECFailure;
+}
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+ PR_ASSERT(pMutex);
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Unlock(pMutex);
+ }
+ PORT_Assert(PR_FALSE && "sslMutex_Unlock not implemented for multi-process applications !");
+ PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+ return SECFailure;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+ PR_ASSERT(pMutex);
+ if (PR_FALSE == pMutex->isMultiProcess) {
+ return single_process_sslMutex_Lock(pMutex);
+ }
+ PORT_Assert(PR_FALSE && "sslMutex_Lock not implemented for multi-process applications !");
+ PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+ return SECFailure;
+}
+
+#endif
+
+#endif