/*
** Receive some application data on a socket. Reads SSL records from the input
** stream, decrypts them and then copies them to the output buffer.
** Called from ssl_SecureRecv() below.
**
** Caller does NOT hold 1stHandshakeLock because that handshake is over.
** Caller doesn't call this until initial handshake is complete.
** For SSLv2, there is no subsequent handshake.
** For SSLv3, the call to ssl3_GatherAppDataRecord may encounter handshake
** messages from a subsequent handshake.
**
** This code is similar to, and easily confused with,
** ssl_GatherRecord1stHandshake() in sslcon.c
*/
static int
DoRecv(sslSocket *ss, unsigned char *out, int len, int flags)
{
int rv;
int amount;
int available;
/* ssl3_GatherAppDataRecord may call ssl_FinishHandshake, which needs the
* 1stHandshakeLock. */
ssl_Get1stHandshakeLock(ss);
ssl_GetRecvBufLock(ss);
available = ss->gs.writeOffset - ss->gs.readOffset;
if (available == 0) {
/* Get some more data */
if (ss->version >= SSL_LIBRARY_VERSION_3_0) {
/* Wait for application data to arrive. */
rv = ssl3_GatherAppDataRecord(ss, 0);
} else {
/* See if we have a complete record */
rv = ssl2_GatherRecord(ss, 0);
}
if (rv <= 0) {
if (rv == 0) {
/* EOF */
SSL_TRC(10, ("%d: SSL[%d]: ssl_recv EOF",
SSL_GETPID(), ss->fd));
goto done;
}
if ((rv != SECWouldBlock) &&
(PR_GetError() != PR_WOULD_BLOCK_ERROR)) {
/* Some random error */
goto done;
}
/*
** Gather record is blocked waiting for more record data to
** arrive. Try to process what we have already received
*/
} else {
/* Gather record has finished getting a complete record */
}
/* See if any clear data is now available */
available = ss->gs.writeOffset - ss->gs.readOffset;
if (available == 0) {
/*
** No partial data is available. Force error code to
** EWOULDBLOCK so that caller will try again later. Note
** that the error code is probably EWOULDBLOCK already,
** but if it isn't (for example, if we received a zero
** length record) then this will force it to be correct.
*/
PORT_SetError(PR_WOULD_BLOCK_ERROR);
rv = SECFailure;
goto done;
}
SSL_TRC(30, ("%d: SSL[%d]: partial data ready, available=%d",
SSL_GETPID(), ss->fd, available));
}
/* Dole out clear data to reader */
amount = PR_MIN(len, available);
PORT_Memcpy(out, ss->gs.buf.buf + ss->gs.readOffset, amount);
if (!(flags & PR_MSG_PEEK)) {
ss->gs.readOffset += amount;
}
PORT_Assert(ss->gs.readOffset <= ss->gs.writeOffset);
rv = amount;
SSL_TRC(30, ("%d: SSL[%d]: amount=%d available=%d",
SSL_GETPID(), ss->fd, amount, available));
PRINT_BUF(4, (ss, "DoRecv receiving plaintext:", out, amount));
done:
ssl_ReleaseRecvBufLock(ss);
ssl_Release1stHandshakeLock(ss);
return rv;
}
static int
DoRecv(sslSocket *ss, unsigned char *out, int len, int flags)
{
int rv;
int amount;
int available;
ssl_Get1stHandshakeLock(ss);
ssl_GetRecvBufLock(ss);
available = ss->gs.writeOffset - ss->gs.readOffset;
if (available == 0) {
if (ss->version >= SSL_LIBRARY_VERSION_3_0) {
rv = ssl3_GatherAppDataRecord(ss, 0);
} else {
rv = ssl2_GatherRecord(ss, 0);
}
if (rv <= 0) {
if (rv == 0) {
SSL_TRC(10, ("%d: SSL[%d]: ssl_recv EOF",
SSL_GETPID(), ss->fd));
goto done;
}
if ((rv != SECWouldBlock) &&
(PR_GetError() != PR_WOULD_BLOCK_ERROR)) {
goto done;
}
} else {
}
available = ss->gs.writeOffset - ss->gs.readOffset;
if (available == 0) {
PORT_SetError(PR_WOULD_BLOCK_ERROR);
rv = SECFailure;
goto done;
}
SSL_TRC(30, ("%d: SSL[%d]: partial data ready, available=%d",
SSL_GETPID(), ss->fd, available));
}
amount = PR_MIN(len, available);
PORT_Memcpy(out, ss->gs.buf.buf + ss->gs.readOffset, amount);
if (!(flags & PR_MSG_PEEK)) {
ss->gs.readOffset += amount;
}
PORT_Assert(ss->gs.readOffset <= ss->gs.writeOffset);
rv = amount;
SSL_TRC(30, ("%d: SSL[%d]: amount=%d available=%d",
SSL_GETPID(), ss->fd, amount, available));
PRINT_BUF(4, (ss, "DoRecv receiving plaintext:", out, amount));
done:
ssl_ReleaseRecvBufLock(ss);
ssl_Release1stHandshakeLock(ss);
return rv;
}