/* got new socket from accept() */
bool sbuf_accept(SBuf *sbuf, int sock, bool is_unix)
{
bool res;
Assert(iobuf_empty(sbuf->io) && sbuf->sock == 0);
AssertSanity(sbuf);
sbuf->sock = sock;
if (!tune_socket(sock, is_unix))
goto failed;
if (!cf_reboot) {
res = sbuf_wait_for_data(sbuf);
if (!res)
goto failed;
/* socket should already have some data (linux only) */
if (cf_tcp_defer_accept && !is_unix) {
sbuf_main_loop(sbuf, DO_RECV);
if (!sbuf->sock)
return false;
}
}
return true;
failed:
sbuf_call_proto(sbuf, SBUF_EV_RECV_FAILED);
return false;
}
bool
BlobImplSnapshot::IsSnapshot() const
{
AssertSanity();
return true;
}
bool
BlobImplSnapshot::IsWholeFile() const
{
AssertSanity();
return mWholeFile;
}
void
BlobImplSnapshot::GetMozFullPathInternal(nsAString& aFilename,
ErrorResult& aRv) const
{
AssertSanity();
MOZ_ASSERT(mIsFile);
aRv = mFile->GetPath(aFilename);
}
NS_IMETHODIMP
PermissionRequestBase::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
AssertSanity();
MOZ_ASSERT(!strcmp(aTopic, kPermissionResponseTopic));
MOZ_ASSERT(mOwnerElement);
MOZ_ASSERT(mPrincipal);
nsCOMPtr<Element> element;
element.swap(mOwnerElement);
nsCOMPtr<nsIPrincipal> principal;
mPrincipal.swap(principal);
nsresult rv;
uint32_t promptResult = nsDependentString(aData).ToInteger(&rv);
MOZ_ALWAYS_TRUE(NS_SUCCEEDED(rv));
// The UI prompt code will only return one of these three values. We have to
// transform it to our values.
MOZ_ASSERT(promptResult == kPermissionDefault ||
promptResult == kPermissionAllowed ||
promptResult == kPermissionDenied);
if (promptResult != kPermissionDefault) {
// Save explicitly allowed or denied permissions now.
SetExplicitPermission(principal, promptResult);
}
PermissionValue permission;
switch (promptResult) {
case kPermissionDefault:
permission = kPermissionPrompt;
break;
case kPermissionAllowed:
permission = kPermissionAllowed;
break;
case kPermissionDenied:
permission = kPermissionDenied;
break;
default:
MOZ_CRASH("Bad prompt result!");
}
OnPromptComplete(permission);
return NS_OK;
}
/* need to connect() to get a socket */
bool sbuf_connect(SBuf *sbuf, const struct sockaddr *sa, int sa_len, int timeout_sec)
{
int res, sock;
struct timeval timeout;
bool is_unix = sa->sa_family == AF_UNIX;
Assert(iobuf_empty(sbuf->io) && sbuf->sock == 0);
AssertSanity(sbuf);
/*
* common stuff
*/
sock = socket(sa->sa_family, SOCK_STREAM, 0);
if (sock < 0) {
/* probably fd limit */
goto failed;
}
if (!tune_socket(sock, is_unix))
goto failed;
sbuf->sock = sock;
timeout.tv_sec = timeout_sec;
timeout.tv_usec = 0;
/* launch connection */
res = safe_connect(sock, sa, sa_len);
if (res == 0) {
/* unix socket gives connection immediately */
sbuf_connect_cb(sock, EV_WRITE, sbuf);
return true;
} else if (errno == EINPROGRESS) {
/* tcp socket needs waiting */
event_set(&sbuf->ev, sock, EV_WRITE, sbuf_connect_cb, sbuf);
res = event_add(&sbuf->ev, &timeout);
if (res >= 0) {
sbuf->wait_type = W_CONNECT;
return true;
}
}
failed:
log_warning("sbuf_connect failed: %s", strerror(errno));
if (sock >= 0)
safe_close(sock);
sbuf->sock = 0;
sbuf_call_proto(sbuf, SBUF_EV_CONNECT_FAILED);
return false;
}
/*
* Call proto callback with proper struct MBuf.
*
* If callback returns true it used one of sbuf_prepare_* on sbuf,
* and processing can continue.
*
* If it returned false it used sbuf_pause(), sbuf_close() or simply
* wants to wait for next event loop (e.g. too few data available).
* Callee should not touch sbuf in that case and just return to libevent.
*/
static bool sbuf_call_proto(SBuf *sbuf, int event)
{
struct MBuf mbuf;
IOBuf *io = sbuf->io;
bool res;
AssertSanity(sbuf);
Assert(event != SBUF_EV_READ || iobuf_amount_parse(io) > 0);
/* if pkt callback, limit only with current packet */
if (event == SBUF_EV_PKT_CALLBACK) {
iobuf_parse_limit(io, &mbuf, sbuf->pkt_remain);
} else if (event == SBUF_EV_READ) {
iobuf_parse_all(io, &mbuf);
} else {
memset(&mbuf, 0, sizeof(mbuf));
}
res = sbuf->proto_cb(sbuf, event, &mbuf);
AssertSanity(sbuf);
Assert(event != SBUF_EV_READ || !res || sbuf->sock > 0);
return res;
}
nsresult
PermissionRequestBase::PromptIfNeeded(PermissionValue* aCurrentValue)
{
AssertSanity();
MOZ_ASSERT(aCurrentValue);
MOZ_ASSERT(mPrincipal);
// Tricky, we want to release the window and principal in all cases except
// when we successfully prompt.
nsCOMPtr<Element> element;
mOwnerElement.swap(element);
nsCOMPtr<nsIPrincipal> principal;
mPrincipal.swap(principal);
PermissionValue currentValue;
nsresult rv = GetCurrentPermission(principal, ¤tValue);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
MOZ_ASSERT(currentValue != kPermissionDefault);
if (currentValue == kPermissionPrompt) {
nsCOMPtr<nsIObserverService> obsSvc = GetObserverService();
if (NS_WARN_IF(!obsSvc)) {
return NS_ERROR_FAILURE;
}
// We're about to prompt so swap the members back.
element.swap(mOwnerElement);
principal.swap(mPrincipal);
rv = obsSvc->NotifyObservers(static_cast<nsIObserver*>(this),
kPermissionPromptTopic,
nullptr);
if (NS_WARN_IF(NS_FAILED(rv))) {
// Finally release if we failed the prompt.
mOwnerElement = nullptr;
mPrincipal = nullptr;
return rv;
}
}
*aCurrentValue = currentValue;
return NS_OK;
}
NS_IMETHODIMP
PermissionRequestBase::GetInterface(const nsIID& aIID,
void** aResult)
{
AssertSanity();
if (aIID.Equals(NS_GET_IID(nsIObserver))) {
return QueryInterface(aIID, aResult);
}
if (aIID.Equals(NS_GET_IID(nsIDOMNode)) && mOwnerElement) {
return mOwnerElement->QueryInterface(aIID, aResult);
}
*aResult = nullptr;
return NS_ERROR_NOT_AVAILABLE;
}
void
PermissionRequestBase::SetExplicitPermission(nsIPrincipal* aPrincipal,
uint32_t aIntPermission)
{
AssertSanity();
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(aIntPermission == kPermissionAllowed ||
aIntPermission == kPermissionDenied);
nsCOMPtr<nsIPermissionManager> permMan = GetPermissionManager();
if (NS_WARN_IF(!permMan)) {
return;
}
nsresult rv = permMan->AddFromPrincipal(aPrincipal,
kPermissionString,
aIntPermission,
nsIPermissionManager::EXPIRE_NEVER,
/* aExpireTime */ 0);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
/* libevent EV_WRITE: called when dest socket is writable again */
static void sbuf_send_cb(int sock, short flags, void *arg)
{
SBuf *sbuf = arg;
bool res;
/* sbuf was closed before in this loop */
if (!sbuf->sock)
return;
AssertSanity(sbuf);
Assert(sbuf->wait_type == W_SEND);
sbuf->wait_type = W_NONE;
/* prepare normal situation for sbuf_main_loop */
res = sbuf_wait_for_data(sbuf);
if (res) {
/* here we should certainly skip recv() */
sbuf_main_loop(sbuf, SKIP_RECV);
} else {
/* drop if problems */
sbuf_call_proto(sbuf, SBUF_EV_SEND_FAILED);
}
}
/*
* Main recv-parse-send-repeat loop.
*
* Reason for skip_recv is to avoid extra recv(). The problem with it
* is EOF from socket. Currently that means that the pending data is
* dropped. Fortunately server sockets are not paused and dropping
* data from client is no problem. So only place where skip_recv is
* important is sbuf_send_cb().
*/
static void sbuf_main_loop(SBuf *sbuf, bool skip_recv)
{
unsigned free, ok;
int loopcnt = 0;
/* sbuf was closed before in this event loop */
if (!sbuf->sock)
return;
/* reading should be disabled when waiting */
Assert(sbuf->wait_type == W_RECV);
AssertSanity(sbuf);
if (!allocate_iobuf(sbuf))
return;
/* avoid recv() if asked */
if (skip_recv)
goto skip_recv;
try_more:
/* make room in buffer */
sbuf_try_resync(sbuf, false);
/* avoid spending too much time on single socket */
if (cf_sbuf_loopcnt > 0 && loopcnt >= cf_sbuf_loopcnt) {
log_debug("loopcnt full");
/*
* sbuf_process_pending() avoids some data if buffer is full,
* but as we exit processing loop here, we need to retry
* after resync to process all data. (result is ignored)
*/
ok = sbuf_process_pending(sbuf);
return;
}
loopcnt++;
/*
* here used to be if (free > SBUF_SMALL_PKT) check
* but with skip_recv switch its should not be needed anymore.
*/
free = iobuf_amount_recv(sbuf->io);
if (free > 0) {
/*
* When suspending, try to hit packet boundary ASAP.
*/
if (cf_pause_mode == P_SUSPEND
&& sbuf->pkt_remain > 0
&& sbuf->pkt_remain < free)
{
free = sbuf->pkt_remain;
}
/* now fetch the data */
ok = sbuf_actual_recv(sbuf, free);
if (!ok)
return;
}
skip_recv:
/* now handle it */
ok = sbuf_process_pending(sbuf);
if (!ok)
return;
/* if the buffer is full, there can be more data available */
if (iobuf_amount_recv(sbuf->io) <= 0)
goto try_more;
/* clean buffer */
sbuf_try_resync(sbuf, true);
/* notify proto that all is sent */
if (sbuf_is_empty(sbuf))
sbuf_call_proto(sbuf, SBUF_EV_FLUSH);
}