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author | William Joye <wjoye@cfa.harvard.edu> | 2019-01-02 21:11:07 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2019-01-02 21:11:07 (GMT) |
commit | a2f632142c20caf1b58cf26cbcc10e8ab598fc92 (patch) | |
tree | 345caa9e72dec72fdca32aecbe8df5f51348d4b1 /tls/tlsIO.c | |
parent | 38372df5fe93ad7eda2915ca1f5335d03a04af5d (diff) | |
download | blt-a2f632142c20caf1b58cf26cbcc10e8ab598fc92.zip blt-a2f632142c20caf1b58cf26cbcc10e8ab598fc92.tar.gz blt-a2f632142c20caf1b58cf26cbcc10e8ab598fc92.tar.bz2 |
update TEA 3.13
Diffstat (limited to 'tls/tlsIO.c')
-rw-r--r-- | tls/tlsIO.c | 1005 |
1 files changed, 0 insertions, 1005 deletions
diff --git a/tls/tlsIO.c b/tls/tlsIO.c deleted file mode 100644 index 9b22548..0000000 --- a/tls/tlsIO.c +++ /dev/null @@ -1,1005 +0,0 @@ -/* - * Copyright (C) 1997-2000 Matt Newman <matt@novadigm.com> - * Copyright (C) 2000 Ajuba Solutions - * - * $Header: /cvsroot/tls/tls/tlsIO.c,v 1.19 2015/06/06 09:07:08 apnadkarni Exp $ - * - * TLS (aka SSL) Channel - can be layered on any bi-directional - * Tcl_Channel (Note: Requires Trf Core Patch) - * - * This was built from scratch based upon observation of OpenSSL 0.9.2B - * - * Addition credit is due for Andreas Kupries (a.kupries@westend.com), for - * providing the Tcl_ReplaceChannel mechanism and working closely with me - * to enhance it to support full fileevent semantics. - * - * Also work done by the follow people provided the impetus to do this "right": - * tclSSL (Colin McCormack, Shared Technology) - * SSLtcl (Peter Antman) - * - */ - -#include "tlsInt.h" - -/* - * Forward declarations - */ - -static int TlsBlockModeProc _ANSI_ARGS_((ClientData instanceData, - int mode)); -static int TlsCloseProc _ANSI_ARGS_ ((ClientData instanceData, - Tcl_Interp *interp)); -static int TlsInputProc _ANSI_ARGS_((ClientData instanceData, - char *buf, int bufSize, int *errorCodePtr)); -static int TlsOutputProc _ANSI_ARGS_((ClientData instanceData, - CONST char *buf, int toWrite, int *errorCodePtr)); -static int TlsGetOptionProc _ANSI_ARGS_ ((ClientData instanceData, - Tcl_Interp *interp, CONST84 char *optionName, - Tcl_DString *dsPtr)); -static void TlsWatchProc _ANSI_ARGS_((ClientData instanceData, int mask)); -static int TlsGetHandleProc _ANSI_ARGS_ ((ClientData instanceData, - int direction, ClientData *handlePtr)); -static int TlsNotifyProc _ANSI_ARGS_ ((ClientData instanceData, - int mask)); -static void TlsChannelHandler _ANSI_ARGS_ ((ClientData clientData, - int mask)); -static void TlsChannelHandlerTimer _ANSI_ARGS_ ((ClientData clientData)); - -/* - * This structure describes the channel type structure for TCP socket - * based IO. These are what the structures should look like, but we - * have to build them up at runtime to be correct depending on whether - * we are loaded into an 8.2.0-8.3.1 or 8.3.2+ Tcl interpreter. - */ -#ifdef TLS_STATIC_STRUCTURES_NOT_USED -static Tcl_ChannelType tlsChannelType2 = { - "tls", /* Type name. */ - TCL_CHANNEL_VERSION_2, /* A v2 channel (8.3.2+) */ - TlsCloseProc, /* Close proc. */ - TlsInputProc, /* Input proc. */ - TlsOutputProc, /* Output proc. */ - NULL, /* Seek proc. */ - NULL, /* Set option proc. */ - TlsGetOptionProc, /* Get option proc. */ - TlsWatchProc, /* Initialize notifier. */ - TlsGetHandleProc, /* Get file handle out of channel. */ - NULL, /* Close2Proc. */ - TlsBlockModeProc, /* Set blocking/nonblocking mode.*/ - NULL, /* FlushProc. */ - TlsNotifyProc, /* handlerProc. */ -}; - -static Tcl_ChannelType tlsChannelType1 = { - "tls", /* Type name. */ - TlsBlockModeProc, /* Set blocking/nonblocking mode.*/ - TlsCloseProc, /* Close proc. */ - TlsInputProc, /* Input proc. */ - TlsOutputProc, /* Output proc. */ - NULL, /* Seek proc. */ - NULL, /* Set option proc. */ - TlsGetOptionProc, /* Get option proc. */ - TlsWatchProc, /* Initialize notifier. */ - TlsGetHandleProc, /* Get file handle out of channel. */ -}; -#else -static Tcl_ChannelType *tlsChannelType = NULL; -#endif - -/* - *------------------------------------------------------------------- - * - * Tls_ChannelType -- - * - * Return the correct TLS channel driver info - * - * Results: - * The correct channel driver for the current version of Tcl. - * - * Side effects: - * None. - * - *------------------------------------------------------------------- - */ -Tcl_ChannelType *Tls_ChannelType() -{ - /* - * Initialize the channel type if necessary - */ - if (tlsChannelType == NULL) { - /* - * Allocation of a new channeltype structure is not easy, because of - * the various verson of the core and subsequent changes to the - * structure. The main challenge is to allocate enough memory for - * odern versions even if this extyension is compiled against one - * of the older variant! - * - * (1) Versions before stubs (8.0.x) are simple, because they are - * supported only if the extension is compiled against exactly - * that version of the core. - * - * (2) With stubs we just determine the difference between the older - * and modern variant and overallocate accordingly if compiled - * against an older variant. - */ - - unsigned int size = sizeof(Tcl_ChannelType); /* Base size */ - - /* - * Size of a procedure pointer. We assume that all procedure - * pointers are of the same size, regardless of exact type - * (arguments and return values). - * - * 8.2. First version containing close2proc. Baseline. - * 8.3.2 Three additional vectors. Moved blockMode, new flush- and - * handlerProc's. - * - * => Compilation against earlier version has to overallocate three - * procedure pointers. - */ - -#ifdef EMULATE_CHANNEL_VERSION_2 - size += 3 * procPtrSize; -#endif - - tlsChannelType = (Tcl_ChannelType *) ckalloc(size); - memset((VOID *) tlsChannelType, 0, size); - - /* - * Common elements of the structure (no changes in location or name) - * close2Proc, seekProc, setOptionProc stay NULL. - */ - - tlsChannelType->typeName = "tls"; - tlsChannelType->closeProc = TlsCloseProc; - tlsChannelType->inputProc = TlsInputProc; - tlsChannelType->outputProc = TlsOutputProc; - tlsChannelType->getOptionProc = TlsGetOptionProc; - tlsChannelType->watchProc = TlsWatchProc; - tlsChannelType->getHandleProc = TlsGetHandleProc; - - /* - * blockModeProc is a twister. We have to make some runtime-choices, - * depending on the version we compiled against. - */ - -#ifdef EMULATE_CHANNEL_VERSION_2 - /* - * We are compiling against an 8.3.1- core. We have to create some - * definitions for the new elements as the compiler does not know them - * by name. - */ - - if (channelTypeVersion == TLS_CHANNEL_VERSION_1) { - /* - * The 'version' element of 8.3.2 is in the the place of the - * blockModeProc. For 8.2.0-8.3.1 we have to set our blockModeProc - * into this place. - */ - tlsChannelType->blockModeProc = TlsBlockModeProc; - } else /* channelTypeVersion == TLS_CHANNEL_VERSION_2 */ { - /* - * For the 8.3.2 core we present ourselves as a version 2 - * driver. This means a special value in version (ex - * blockModeProc), blockModeProc in a different place and of - * course usage of the handlerProc. The last two have to - * referenced with pointer magic because they aren't defined - * otherwise. - */ - - tlsChannelType->blockModeProc = - (Tcl_DriverBlockModeProc*) TLS_CHANNEL_VERSION_2; - (*((Tcl_DriverBlockModeProc**)(&(tlsChannelType->close2Proc)+1))) - = TlsBlockModeProc; - (*((TlsDriverHandlerProc**)(&(tlsChannelType->close2Proc)+3))) - = TlsNotifyProc; - } -#else - /* - * Compiled against 8.3.2+. Direct access to all elements possible. Use - * channelTypeVersion information to select the values to use. - */ - - if (channelTypeVersion == TLS_CHANNEL_VERSION_1) { - /* - * The 'version' element of 8.3.2 is in the the place of the - * blockModeProc. For the original patch in 8.1.x and the firstly - * included (8.2) we have to set our blockModeProc into this - * place. - */ - tlsChannelType->version = (Tcl_ChannelTypeVersion)TlsBlockModeProc; - } else /* channelTypeVersion == TLS_CHANNEL_VERSION_2 */ { - /* - * For the 8.3.2 core we present ourselves as a version 2 - * driver. This means a special value in version (ex - * blockModeProc), blockModeProc in a different place and of - * course usage of the handlerProc. - */ - - tlsChannelType->version = TCL_CHANNEL_VERSION_2; - tlsChannelType->blockModeProc = TlsBlockModeProc; - tlsChannelType->handlerProc = TlsNotifyProc; - } -#endif - } - return tlsChannelType; -} - -/* - *------------------------------------------------------------------- - * - * TlsBlockModeProc -- - * - * This procedure is invoked by the generic IO level - * to set blocking and nonblocking modes - * Results: - * 0 if successful, errno when failed. - * - * Side effects: - * Sets the device into blocking or nonblocking mode. - * - *------------------------------------------------------------------- - */ - -static int -TlsBlockModeProc(ClientData instanceData, /* Socket state. */ - int mode) /* The mode to set. Can be one of - * TCL_MODE_BLOCKING or - * TCL_MODE_NONBLOCKING. */ -{ - State *statePtr = (State *) instanceData; - - if (mode == TCL_MODE_NONBLOCKING) { - statePtr->flags |= TLS_TCL_ASYNC; - } else { - statePtr->flags &= ~(TLS_TCL_ASYNC); - } - if (channelTypeVersion == TLS_CHANNEL_VERSION_2) { - return 0; - } else { - return Tcl_SetChannelOption(statePtr->interp, Tls_GetParent(statePtr), - "-blocking", (mode == TCL_MODE_NONBLOCKING) ? "0" : "1"); - } -} - -/* - *------------------------------------------------------------------- - * - * TlsCloseProc -- - * - * This procedure is invoked by the generic IO level to perform - * channel-type-specific cleanup when a SSL socket based channel - * is closed. - * - * Note: we leave the underlying socket alone, is this right? - * - * Results: - * 0 if successful, the value of Tcl_GetErrno() if failed. - * - * Side effects: - * Closes the socket of the channel. - * - *------------------------------------------------------------------- - */ -static int -TlsCloseProc(ClientData instanceData, /* The socket to close. */ - Tcl_Interp *interp) /* For error reporting - unused. */ -{ - State *statePtr = (State *) instanceData; - - dprintf(stderr,"\nTlsCloseProc(0x%x)", (unsigned int) statePtr); - - if (channelTypeVersion == TLS_CHANNEL_VERSION_1) { - /* - * Remove event handler to underlying channel, this could - * be because we are closing for real, or being "unstacked". - */ - - Tcl_DeleteChannelHandler(Tls_GetParent(statePtr), - TlsChannelHandler, (ClientData) statePtr); - } - - Tls_Clean(statePtr); - Tcl_EventuallyFree((ClientData)statePtr, Tls_Free); - return TCL_OK; -} - -/* - *------------------------------------------------------------------- - * - * TlsInputProc -- - * - * This procedure is invoked by the generic IO level - * to read input from a SSL socket based channel. - * - * Results: - * The number of bytes read is returned or -1 on error. An output - * argument contains the POSIX error code on error, or zero if no - * error occurred. - * - * Side effects: - * Reads input from the input device of the channel. - * - *------------------------------------------------------------------- - */ - -static int -TlsInputProc(ClientData instanceData, /* Socket state. */ - char *buf, /* Where to store data read. */ - int bufSize, /* How much space is available - * in the buffer? */ - int *errorCodePtr) /* Where to store error code. */ -{ - State *statePtr = (State *) instanceData; - int bytesRead; /* How many bytes were read? */ - - *errorCodePtr = 0; - - dprintf(stderr,"\nBIO_read(%d)", bufSize); - - if (statePtr->flags & TLS_TCL_CALLBACK) { - /* don't process any bytes while verify callback is running */ - bytesRead = 0; - goto input; - } - - if (!SSL_is_init_finished(statePtr->ssl)) { - bytesRead = Tls_WaitForConnect(statePtr, errorCodePtr); - if (bytesRead <= 0) { - if (*errorCodePtr == ECONNRESET) { - /* Soft EOF */ - *errorCodePtr = 0; - bytesRead = 0; - } - goto input; - } - } - if (statePtr->flags & TLS_TCL_INIT) { - statePtr->flags &= ~(TLS_TCL_INIT); - } - /* - * We need to clear the SSL error stack now because we sometimes reach - * this function with leftover errors in the stack. If BIO_read - * returns -1 and intends EAGAIN, there is a leftover error, it will be - * misconstrued as an error, not EAGAIN. - * - * Alternatively, we may want to handle the <0 return codes from - * BIO_read specially (as advised in the RSA docs). TLS's lower level BIO - * functions play with the retry flags though, and this seems to work - * correctly. Similar fix in TlsOutputProc. - hobbs - */ - ERR_clear_error(); - bytesRead = BIO_read(statePtr->bio, buf, bufSize); - dprintf(stderr,"\nBIO_read -> %d", bytesRead); - - if (bytesRead < 0) { - int err = SSL_get_error(statePtr->ssl, bytesRead); - - if (err == SSL_ERROR_SSL) { - Tls_Error(statePtr, SSL_ERROR(statePtr->ssl, bytesRead)); - *errorCodePtr = ECONNABORTED; - } else if (BIO_should_retry(statePtr->bio)) { - dprintf(stderr,"RE! "); - *errorCodePtr = EAGAIN; - } else { - *errorCodePtr = Tcl_GetErrno(); - if (*errorCodePtr == ECONNRESET) { - /* Soft EOF */ - *errorCodePtr = 0; - bytesRead = 0; - } - } - } - input: - dprintf(stderr, "\nInput(%d) -> %d [%d]", bufSize, bytesRead, *errorCodePtr); - return bytesRead; -} - -/* - *------------------------------------------------------------------- - * - * TlsOutputProc -- - * - * This procedure is invoked by the generic IO level - * to write output to a SSL socket based channel. - * - * Results: - * The number of bytes written is returned. An output argument is - * set to a POSIX error code if an error occurred, or zero. - * - * Side effects: - * Writes output on the output device of the channel. - * - *------------------------------------------------------------------- - */ - -static int -TlsOutputProc(ClientData instanceData, /* Socket state. */ - CONST char *buf, /* The data buffer. */ - int toWrite, /* How many bytes to write? */ - int *errorCodePtr) /* Where to store error code. */ -{ - State *statePtr = (State *) instanceData; - int written, err; - - *errorCodePtr = 0; - - dprintf(stderr,"\nBIO_write(0x%x, %d)", (unsigned int) statePtr, toWrite); - - if (statePtr->flags & TLS_TCL_CALLBACK) { - /* don't process any bytes while verify callback is running */ - written = -1; - *errorCodePtr = EAGAIN; - goto output; - } - - if (!SSL_is_init_finished(statePtr->ssl)) { - written = Tls_WaitForConnect(statePtr, errorCodePtr); - if (written <= 0) { - goto output; - } - } - if (statePtr->flags & TLS_TCL_INIT) { - statePtr->flags &= ~(TLS_TCL_INIT); - } - if (toWrite == 0) { - dprintf(stderr, "zero-write\n"); - BIO_flush(statePtr->bio); - written = 0; - goto output; - } else { - /* - * We need to clear the SSL error stack now because we sometimes reach - * this function with leftover errors in the stack. If BIO_write - * returns -1 and intends EAGAIN, there is a leftover error, it will be - * misconstrued as an error, not EAGAIN. - * - * Alternatively, we may want to handle the <0 return codes from - * BIO_write specially (as advised in the RSA docs). TLS's lower level - * BIO functions play with the retry flags though, and this seems to - * work correctly. Similar fix in TlsInputProc. - hobbs - */ - ERR_clear_error(); - written = BIO_write(statePtr->bio, buf, toWrite); - dprintf(stderr,"\nBIO_write(0x%x, %d) -> [%d]", - (unsigned int) statePtr, toWrite, written); - } - if (written <= 0) { - switch ((err = SSL_get_error(statePtr->ssl, written))) { - case SSL_ERROR_NONE: - if (written < 0) { - written = 0; - } - break; - case SSL_ERROR_WANT_WRITE: - dprintf(stderr," write W BLOCK"); - break; - case SSL_ERROR_WANT_READ: - dprintf(stderr," write R BLOCK"); - break; - case SSL_ERROR_WANT_X509_LOOKUP: - dprintf(stderr," write X BLOCK"); - break; - case SSL_ERROR_ZERO_RETURN: - dprintf(stderr," closed\n"); - written = 0; - break; - case SSL_ERROR_SYSCALL: - *errorCodePtr = Tcl_GetErrno(); - dprintf(stderr," [%d] syscall errr: %d", - written, *errorCodePtr); - written = -1; - break; - case SSL_ERROR_SSL: - Tls_Error(statePtr, SSL_ERROR(statePtr->ssl, written)); - *errorCodePtr = ECONNABORTED; - written = -1; - break; - default: - dprintf(stderr," unknown err: %d\n", err); - break; - } - } - output: - dprintf(stderr, "\nOutput(%d) -> %d", toWrite, written); - return written; -} - -/* - *------------------------------------------------------------------- - * - * TlsGetOptionProc -- - * - * Computes an option value for a SSL socket based channel, or a - * list of all options and their values. - * - * Results: - * A standard Tcl result. The value of the specified option or a - * list of all options and their values is returned in the - * supplied DString. - * - * Side effects: - * None. - * - *------------------------------------------------------------------- - */ -static int -TlsGetOptionProc(ClientData instanceData, /* Socket state. */ - Tcl_Interp *interp, /* For errors - can be NULL. */ - CONST84 char *optionName, /* Name of the option to - * retrieve the value for, or - * NULL to get all options and - * their values. */ - Tcl_DString *dsPtr) /* Where to store the computed value - * initialized by caller. */ -{ - State *statePtr = (State *) instanceData; - - if (channelTypeVersion == TLS_CHANNEL_VERSION_2) { - Tcl_Channel downChan = Tls_GetParent(statePtr); - Tcl_DriverGetOptionProc *getOptionProc; - - getOptionProc = Tcl_ChannelGetOptionProc(Tcl_GetChannelType(downChan)); - if (getOptionProc != NULL) { - return (*getOptionProc)(Tcl_GetChannelInstanceData(downChan), - interp, optionName, dsPtr); - } else if (optionName == (char*) NULL) { - /* - * Request is query for all options, this is ok. - */ - return TCL_OK; - } - /* - * Request for a specific option has to fail, we don't have any. - */ - return TCL_ERROR; - } else { - size_t len = 0; - - if (optionName != (char *) NULL) { - len = strlen(optionName); - } -#if 0 - if ((len == 0) || ((len > 1) && (optionName[1] == 'c') && - (strncmp(optionName, "-cipher", len) == 0))) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-cipher"); - } - Tcl_DStringAppendElement(dsPtr, SSL_get_cipher(statePtr->ssl)); - if (len) { - return TCL_OK; - } - } -#endif - return TCL_OK; - } -} - -/* - *------------------------------------------------------------------- - * - * TlsWatchProc -- - * - * Initialize the notifier to watch Tcl_Files from this channel. - * - * Results: - * None. - * - * Side effects: - * Sets up the notifier so that a future event on the channel - * will be seen by Tcl. - * - *------------------------------------------------------------------- - */ - -static void -TlsWatchProc(ClientData instanceData, /* The socket state. */ - int mask) /* Events of interest; an OR-ed - * combination of TCL_READABLE, - * TCL_WRITABLE and TCL_EXCEPTION. */ -{ - State *statePtr = (State *) instanceData; - - dprintf(stderr, "TlsWatchProc(0x%x)\n", mask); - - /* Pretend to be dead as long as the verify callback is running. - * Otherwise that callback could be invoked recursively. */ - if (statePtr->flags & TLS_TCL_CALLBACK) { return; } - - if (channelTypeVersion == TLS_CHANNEL_VERSION_2) { - Tcl_Channel downChan; - - statePtr->watchMask = mask; - - /* No channel handlers any more. We will be notified automatically - * about events on the channel below via a call to our - * 'TransformNotifyProc'. But we have to pass the interest down now. - * We are allowed to add additional 'interest' to the mask if we want - * to. But this transformation has no such interest. It just passes - * the request down, unchanged. - */ - - downChan = Tls_GetParent(statePtr); - - (Tcl_GetChannelType(downChan)) - ->watchProc(Tcl_GetChannelInstanceData(downChan), mask); - - /* - * Management of the internal timer. - */ - - if (statePtr->timer != (Tcl_TimerToken) NULL) { - Tcl_DeleteTimerHandler(statePtr->timer); - statePtr->timer = (Tcl_TimerToken) NULL; - } - if ((mask & TCL_READABLE) && Tcl_InputBuffered(statePtr->self) > 0) { - /* - * There is interest in readable events and we actually have - * data waiting, so generate a timer to flush that. - */ - statePtr->timer = Tcl_CreateTimerHandler(TLS_TCL_DELAY, - TlsChannelHandlerTimer, (ClientData) statePtr); - } - } else { - if (mask == statePtr->watchMask) - return; - - if (statePtr->watchMask) { - /* - * Remove event handler to underlying channel, this could - * be because we are closing for real, or being "unstacked". - */ - - Tcl_DeleteChannelHandler(Tls_GetParent(statePtr), - TlsChannelHandler, (ClientData) statePtr); - } - statePtr->watchMask = mask; - if (statePtr->watchMask) { - /* - * Setup active monitor for events on underlying Channel. - */ - - Tcl_CreateChannelHandler(Tls_GetParent(statePtr), - statePtr->watchMask, TlsChannelHandler, - (ClientData) statePtr); - } - } -} - -/* - *------------------------------------------------------------------- - * - * TlsGetHandleProc -- - * - * Called from Tcl_GetChannelFile to retrieve o/s file handler - * from the SSL socket based channel. - * - * Results: - * The appropriate Tcl_File or NULL if not present. - * - * Side effects: - * None. - * - *------------------------------------------------------------------- - */ -static int -TlsGetHandleProc(ClientData instanceData, /* The socket state. */ - int direction, /* Which Tcl_File to retrieve? */ - ClientData *handlePtr) /* Where to store the handle. */ -{ - State *statePtr = (State *) instanceData; - - return Tcl_GetChannelHandle(Tls_GetParent(statePtr), direction, handlePtr); -} - -/* - *------------------------------------------------------------------- - * - * TlsNotifyProc -- - * - * Handler called by Tcl to inform us of activity - * on the underlying channel. - * - * Results: - * None. - * - * Side effects: - * May process the incoming event by itself. - * - *------------------------------------------------------------------- - */ - -static int -TlsNotifyProc(instanceData, mask) - ClientData instanceData; /* The state of the notified transformation */ - int mask; /* The mask of occuring events */ -{ - State *statePtr = (State *) instanceData; - - /* - * An event occured in the underlying channel. This - * transformation doesn't process such events thus returns the - * incoming mask unchanged. - */ - - if (statePtr->timer != (Tcl_TimerToken) NULL) { - /* - * Delete an existing timer. It was not fired, yet we are - * here, so the channel below generated such an event and we - * don't have to. The renewal of the interest after the - * execution of channel handlers will eventually cause us to - * recreate the timer (in WatchProc). - */ - - Tcl_DeleteTimerHandler(statePtr->timer); - statePtr->timer = (Tcl_TimerToken) NULL; - } - - if (statePtr->flags & TLS_TCL_CALLBACK) { - return 0; - } - - if (statePtr->flags & TLS_TCL_INIT - && !SSL_is_init_finished(statePtr->ssl)) { - int errorCode; - if (Tls_WaitForConnect(statePtr, &errorCode) <= 0 - && errorCode == EAGAIN) { - return 0; - } - } - - return mask; -} - -/* - *------------------------------------------------------* - * - * TlsChannelHandler -- - * - * ------------------------------------------------* - * Handler called by Tcl as a result of - * Tcl_CreateChannelHandler - to inform us of activity - * on the underlying channel. - * ------------------------------------------------* - * - * Sideeffects: - * May generate subsequent calls to - * Tcl_NotifyChannel. - * - * Result: - * None. - * - *------------------------------------------------------* - */ - -static void -TlsChannelHandler (clientData, mask) - ClientData clientData; - int mask; -{ - State *statePtr = (State *) clientData; - -dprintf(stderr, "HANDLER(0x%x)\n", mask); - Tcl_Preserve( (ClientData)statePtr); - - if (mask & TCL_READABLE) { - BIO_set_flags(statePtr->p_bio, BIO_FLAGS_READ); - } else { - BIO_clear_flags(statePtr->p_bio, BIO_FLAGS_READ); - } - - if (mask & TCL_WRITABLE) { - BIO_set_flags(statePtr->p_bio, BIO_FLAGS_WRITE); - } else { - BIO_clear_flags(statePtr->p_bio, BIO_FLAGS_WRITE); - } - - mask = 0; - if (BIO_wpending(statePtr->bio)) { - mask |= TCL_WRITABLE; - } - if (BIO_pending(statePtr->bio)) { - mask |= TCL_READABLE; - } - - /* - * The following NotifyChannel calls seems to be important, but - * we don't know why. It looks like if the mask is ever non-zero - * that it will enter an infinite loop. - * - * Notify the upper channel of the current BIO state so the event - * continues to propagate up the chain. - * - * stanton: It looks like this could result in an infinite loop if - * the upper channel doesn't cause ChannelHandler to be removed - * before Tcl_NotifyChannel calls channel handlers on the lower channel. - */ - - Tcl_NotifyChannel(statePtr->self, mask); - - if (statePtr->timer != (Tcl_TimerToken)NULL) { - Tcl_DeleteTimerHandler(statePtr->timer); - statePtr->timer = (Tcl_TimerToken)NULL; - } - if ((mask & TCL_READABLE) && Tcl_InputBuffered(statePtr->self) > 0) { - /* - * Data is waiting, flush it out in short time - */ - statePtr->timer = Tcl_CreateTimerHandler(TLS_TCL_DELAY, - TlsChannelHandlerTimer, (ClientData) statePtr); - } - Tcl_Release( (ClientData)statePtr); -} - -/* - *------------------------------------------------------* - * - * TlsChannelHandlerTimer -- - * - * ------------------------------------------------* - * Called by the notifier (-> timer) to flush out - * information waiting in channel buffers. - * ------------------------------------------------* - * - * Sideeffects: - * As of 'TlsChannelHandler'. - * - * Result: - * None. - * - *------------------------------------------------------* - */ - -static void -TlsChannelHandlerTimer (clientData) -ClientData clientData; /* Transformation to query */ -{ - State *statePtr = (State *) clientData; - int mask = 0; - - statePtr->timer = (Tcl_TimerToken) NULL; - - if (BIO_wpending(statePtr->bio)) { - mask |= TCL_WRITABLE; - } - if (BIO_pending(statePtr->bio)) { - mask |= TCL_READABLE; - } - Tcl_NotifyChannel(statePtr->self, mask); -} - -/* - *------------------------------------------------------* - * - * Tls_WaitForConnect -- - * - * Sideeffects: - * Issues SSL_accept or SSL_connect - * - * Result: - * None. - * - *------------------------------------------------------* - */ -int -Tls_WaitForConnect( statePtr, errorCodePtr) - State *statePtr; - int *errorCodePtr; /* Where to store error code. */ -{ - int err; - - dprintf(stderr,"\nWaitForConnect(0x%x)", (unsigned int) statePtr); - - if (statePtr->flags & TLS_TCL_HANDSHAKE_FAILED) { - /* - * We choose ECONNRESET over ECONNABORTED here because some server - * side code, on the wiki for example, sets up a read handler that - * does a read and if eof closes the channel. There is no catch/try - * around the reads so exceptions will result in potentially many - * dangling channels hanging around that should have been closed. - * (Backgroun: ECONNABORTED maps to a Tcl exception and - * ECONNRESET maps to graceful EOF). - */ - *errorCodePtr = ECONNRESET; - return -1; - } - - for (;;) { - /* Not initialized yet! */ - if (statePtr->flags & TLS_TCL_SERVER) { - err = SSL_accept(statePtr->ssl); - } else { - err = SSL_connect(statePtr->ssl); - } - /*SSL_write(statePtr->ssl, (char*)&err, 0); HACK!!! */ - if (err > 0) { - BIO_flush(statePtr->bio); - } - - if (err <= 0) { - int rc = SSL_get_error(statePtr->ssl, err); - - if (rc == SSL_ERROR_SSL) { - Tls_Error(statePtr, - (char *)ERR_reason_error_string(ERR_get_error())); - statePtr->flags |= TLS_TCL_HANDSHAKE_FAILED; - *errorCodePtr = ECONNABORTED; - return -1; - } else if (BIO_should_retry(statePtr->bio)) { - if (statePtr->flags & TLS_TCL_ASYNC) { - dprintf(stderr,"E! "); - *errorCodePtr = EAGAIN; - return -1; - } else { - continue; - } - } else if (err == 0) { - dprintf(stderr,"CR! "); - *errorCodePtr = ECONNRESET; - return -1; - } - if (statePtr->flags & TLS_TCL_SERVER) { - err = SSL_get_verify_result(statePtr->ssl); - if (err != X509_V_OK) { - Tls_Error(statePtr, - (char *)X509_verify_cert_error_string(err)); - statePtr->flags |= TLS_TCL_HANDSHAKE_FAILED; - *errorCodePtr = ECONNABORTED; - return -1; - } - } - *errorCodePtr = Tcl_GetErrno(); - dprintf(stderr,"ERR(%d, %d) ", rc, *errorCodePtr); - return -1; - } - dprintf(stderr,"R0! "); - return 1; - } -} - -Tcl_Channel -Tls_GetParent( statePtr ) - State *statePtr; -{ - if (channelTypeVersion == TLS_CHANNEL_VERSION_2) { - return Tcl_GetStackedChannel(statePtr->self); - } else { - /* The reason for the existence of this procedure is - * the fact that stacking a transform over another - * transform will leave our internal pointer unchanged, - * and thus pointing to the new transform, and not the - * Channel structure containing the saved state of this - * transform. This is the price to pay for leaving - * Tcl_Channel references intact. The only other solution - * is an extension of Tcl_ChannelType with another driver - * procedure to notify a Channel about the (un)stacking. - * - * It walks the chain of Channel structures until it - * finds the one pointing having 'ctrl' as instanceData - * and then returns the superceding channel to that. (AK) - */ - - Tcl_Channel self = statePtr->self; - Tcl_Channel next; - - while ((ClientData) statePtr != Tcl_GetChannelInstanceData (self)) { - next = Tcl_GetStackedChannel (self); - if (next == (Tcl_Channel) NULL) { - /* 09/24/1999 Unstacking bug, - * found by Matt Newman <matt@sensus.org>. - * - * We were unable to find the channel structure for this - * transformation in the chain of stacked channel. This - * means that we are currently in the process of unstacking - * it *and* there were some bytes waiting which are now - * flushed. In this situation the pointer to the channel - * itself already refers to the parent channel we have to - * write the bytes into, so we return that. - */ - return statePtr->self; - } - self = next; - } - - return Tcl_GetStackedChannel (self); - } -} |