if (certNames != NULL) {
		SSL_CTX_set_client_CA_list(ctx, certNames);
	    }
	    Tcl_DStringFree(&ds);
	}
#endif
    }
 
    if (abort > 0) {
	/* return error */
    }
    return ctx;
}

/*

/*
 * Provides Custom BIO layer to interface OpenSSL with TCL. These
 * functions directly interface between the IO channel and BIO buffers.
 *
 * Copyright (C) 1997-2000 Matt Newman <[email protected]>
 * Copyright (C) 2024 Brian O'Hagan
 *
 */

/*
		tlsBIO.c				tlsIO.c
  +------+                         +-----+                                     +------+
  |      |Tcl_WriteRaw <-- BioWrite| SSL |BIO_write <-- TlsOutputProc <-- Write|      |
  |socket|      <encrypted>        | BIO |            <unencrypted>            | App  | 
  |      |Tcl_ReadRaw  -->  BioRead|     |BIO_Read  --> TlsInputProc  -->  Read|      |
  +------+                         +-----+                                     +------+
*/

#include "tlsInt.h"
#include <openssl/bio.h>

 */

BIO *BIO_new_tcl(State *statePtr, int flags) {
    BIO *bio;
#ifdef TCLTLS_SSL_USE_FASTPATH
    Tcl_Channel parentChannel;
    const Tcl_ChannelType *parentChannelType;
    
    int parentChannelFdIn, parentChannelFdOut, parentChannelFd;
    int validParentChannelFd;
#endif

    dprintf("BIO_new_tcl() called");

    /* Create custom BIO method */

 *
 */

/*
		tlsBIO.c				tlsIO.c
  +------+                         +-----+                                     +------+
  |      |Tcl_WriteRaw <-- BioWrite| SSL |BIO_write <-- TlsOutputProc <-- Write|      |
  |socket|      <encrypted>        | BIO |            <unencrypted>            | App  | 
  |      |Tcl_ReadRaw  -->  BioRead|     |BIO_Read  --> TlsInputProc  -->  Read|      |
  +------+                         +-----+                                     +------+
*/

#include "tlsInt.h"
#include <errno.h>

 *	a POSIX error code if an error occurred, or 0 if none.
 *
 * Side effects:
 *    Reads input from the input device of the channel.
 *
 * Data is received in whole blocks known as records from the peer. A whole
 * record is processed (e.g. decrypted) in one go and is buffered by OpenSSL
 * until it is read by the application via a call to SSL_read. 
 *
 *-----------------------------------------------------------------------------
 */
static int TlsInputProc(ClientData instanceData, char *buf, int bufSize, int *errorCodePtr) {
    unsigned long backingError;
    State *statePtr = (State *) instanceData;
    int bytesRead, err;

	    dprintf("Read failed with code=%d, bytes read=%d: should retry", err, bytesRead);
	    /* Some docs imply we should redo the BIO_read now */
	} else {
	    dprintf("Read failed with code=%d, bytes read=%d: error condition", err, bytesRead);
	}

	dprintf("BIO is EOF %d", BIO_eof(statePtr->bio));
	
	/* These are the same as BIO_retry_type */
	if (BIO_should_read(statePtr->bio)) {
	    dprintf("BIO has insufficient data to read and return");
	    statePtr->want |= TCL_READABLE;
	}
	if (BIO_should_write(statePtr->bio)) {
	    dprintf("BIO has pending data to write");

/*
 *-----------------------------------------------------------------------------
 *
 * TlsOutputProc --
 *
 *	This procedure is invoked by the generic I/O layer to write data to the
 *	BIO whenever the the Tcl_Write(), Tcl_WriteChars, and Tcl_WriteObj 
 *	functions are used. Equivalent to SSL_write_ex and SSL_write.
 *
 * Results:
 *    Returns the number of bytes written or -1 on error. Sets errorCodePtr
 *    to a POSIX error code if an error occurred, or 0 if none.
 *
 * Side effects:

    const char *hex = "0123456789abcdef";

    if (resultObj == NULL) {
	return NULL;
    }

    for (int i = 0; i < ilen; i++) {
        *dptr++ = hex[(*iptr>>4)&0xF];
        *dptr++ = hex[(*iptr++)&0xF];
    }
    return resultObj;
}

/*
 *-----------------------------------------------------------------------------
 *

    LAPPEND_BOOL(interp, resultObj, "extInvalid", xflags & EXFLAG_INVALID);
    LAPPEND_BOOL(interp, resultObj, "isCACert", X509_check_ca(cert));

    /* The Unique Ids are used to handle the possibility of reuse of subject
	and/or issuer names over time. RFC 5280 section 4.1.2.8 */
    {
	const ASN1_BIT_STRING *iuid, *suid;
        X509_get0_uids(cert, &iuid, &suid);

	Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("issuerUniqueId", -1));
	if (iuid != NULL) {
	    Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewByteArrayObj((const unsigned char *)iuid->data, (Tcl_Size) iuid->length));
	} else {
	    Tcl_ListObjAppendElement(interp, resultObj, Tcl_NewStringObj("", -1));
	}

    /* Subject Information Access - RFC 5280 section 4.2.2.2, NID_sinfo_access */

    /* Certificate Alias. If uses a PKCS#12 structure, alias will reflect the
	friendlyName attribute (RFC 2985). */
    {
	int ilen = 0;
        unsigned char *string = X509_alias_get0(cert, &ilen);
	LAPPEND_STR(interp, resultObj, "alias", (char *) string, (Tcl_Size) ilen);
        string = X509_keyid_get0(cert, &ilen);
	LAPPEND_STR(interp, resultObj, "keyId", (char *) string, (Tcl_Size) ilen);
    }

    /* Certificate and dump all data */
    if (all) {
	Tcl_Obj *allObj = Tcl_NewByteArrayObj(NULL, 0);
	Tcl_Obj *certObj = Tcl_NewByteArrayObj(NULL, 0);

    # Maps UID to Server Socket
    variable srvmap
    variable srvuid 0

    # Over-ride this if you are using a different socket command
    variable socketCmd
    if {![info exists socketCmd]} {
        set socketCmd [info command ::socket]
    }

    # This is the possible arguments to tls::socket and tls::init
    # The format of this is a list of lists
    ## Each inner list contains the following elements
    ### Server (matched against "string match" for 0/1)
    ### Option name
    ### Variable to add the option to:
    #### sopts: [socket] option
    #### iopts: [tls::import] option
    ### How many arguments the following the option to consume
    variable socketOptionRules {
        {0 -async sopts 0}
        {* -myaddr sopts 1}
        {0 -myport sopts 1}
        {* -type sopts 1}
        {* -alpn iopts 1}
        {* -cadir iopts 1}
        {* -cafile iopts 1}
        {* -castore iopts 1}
        {* -cert iopts 1}
        {* -certfile iopts 1}
        {* -cipher iopts 1}
        {* -ciphersuites iopts 1}
        {* -command iopts 1}
        {* -dhparams iopts 1}
        {* -key iopts 1}
        {* -keyfile iopts 1}
        {* -password iopts 1}
        {* -post_handshake iopts 1}
        {* -request iopts 1}
        {* -require iopts 1}
        {* -securitylevel iopts 1}
        {* -autoservername discardOpts 1}
        {* -server iopts 1}
        {* -servername iopts 1}
        {* -session_id iopts 1}
        {* -ssl2 iopts 1}
        {* -ssl3 iopts 1}
        {* -tls1 iopts 1}
        {* -tls1.1 iopts 1}
        {* -tls1.2 iopts 1}
        {* -tls1.3 iopts 1}
        {* -validatecommand iopts 1}
        {* -vcmd iopts 1}
    }

    # tls::socket and tls::init options as a humane readable string
    variable socketOptionsNoServer
    variable socketOptionsServer

    # Internal [switch] body to validate options
    variable socketOptionsSwitchBody
}

proc tls::_initsocketoptions {} {
    variable socketOptionRules
    variable socketOptionsNoServer
    variable socketOptionsServer
    variable socketOptionsSwitchBody

    # Do not re-run if we have already been initialized
    if {[info exists socketOptionsSwitchBody]} {
        return
    }

    # Create several structures from our list of options
    ## 1. options: a text representation of the valid options for the current
    ##             server type
    ## 2. argSwitchBody: Switch body for processing arguments
    set options(0) [list]
    set options(1) [list]
    set argSwitchBody [list]
    foreach optionRule $socketOptionRules {
        set ruleServer [lindex $optionRule 0]
        set ruleOption [lindex $optionRule 1]
        set ruleVarToUpdate [lindex $optionRule 2]
        set ruleVarArgsToConsume [lindex $optionRule 3]

        foreach server [list 0 1] {
            if {![string match $ruleServer $server]} {
                continue
            }

            lappend options($server) $ruleOption
        }

        switch -- $ruleVarArgsToConsume {
            0 {
                set argToExecute {
                    lappend @VAR@ $arg
                    set argsArray($arg) true
                }
            }
            1 {
                set argToExecute {
                    incr idx
                    if {$idx >= [llength $args]} {
                        return -code error "\"$arg\" option must be followed by value"
                    }
                    set argValue [lindex $args $idx]
                    lappend @VAR@ $arg $argValue
                    set argsArray($arg) $argValue
                }
            }
            default {
                return -code error "Internal argument construction error"
            }
        }

        lappend argSwitchBody $ruleServer,$ruleOption [string map [list @VAR@ $ruleVarToUpdate] $argToExecute]
    }

    # Add in the final options
    lappend argSwitchBody {*,-*} {return -code error "bad option \"$arg\": must be one of $options"}
    lappend argSwitchBody default break

    # Set the final variables

    set idx [lsearch $args -server]
    if {$idx != -1} {
	set server 1
	set callback [lindex $args [expr {$idx+1}]]
	set args [lreplace $args $idx [expr {$idx+1}]]

	set usage "wrong # args: should be \"tls::socket -server command ?options? port\""
        set options $socketOptionsServer
    } else {
	set server 0

	set usage "wrong # args: should be \"tls::socket ?options? host port\""
        set options $socketOptionsNoServer
    }

    # Combine defaults with current options
    set args [concat $defaults $args]

    set argc [llength $args]
    set sopts {}

	if {($idx + 2) != $argc} {
	    return -code error $usage
	}

	set host [lindex $args [expr {$argc-2}]]
	set port [lindex $args [expr {$argc-1}]]

        # If an "-autoservername" option is found, honor it
        if {[info exists argsArray(-autoservername)] && $argsArray(-autoservername)} {
            if {![info exists argsArray(-servername)]} {
                set argsArray(-servername) $host
                lappend iopts -servername $host
            }
        }

	lappend sopts $host $port
    }
    #
    # Create TCP/IP socket
    #
    set chan [eval $socketCmd $sopts]

#! /usr/bin/env tclsh

set auto_path [linsert $auto_path 0 [file normalize [file join [file dirname [info script]] ..]]]
package require tls

set s [tls::socket 127.0.0.1 12300]
puts $s "A line"
flush $s