Move ttynvt source to src/
This commit is contained in:
Kim Woelders
committed by
Kim Woelders
Kim Woelders
parent
cf6b334bcc
commit
e3675b9e89
@@ -0,0 +1,13 @@
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CFLAGS_OPT = -O3
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CFLAGS_WARN = -Wall -Wextra -Werror -Wno-unused-parameter
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bin_PROGRAMS = ttynvt
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ttynvt_SOURCES = \
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ttynvt.c \
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telnet_basic.c telnet_rfc2217.c telnet.h telnet_param.h
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ttynvt_CPPFLAGS = -I$(top_builddir) $(FUSE_CFLAGS) $(CFLAGS_OPT) $(CFLAGS_WARN)
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ttynvt_LDADD = $(FUSE_LIBS)
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@@ -0,0 +1,70 @@
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/*
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* Copyright (c) 2018 Lars Thrane A/S
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* SPDX-License-Identifier: GPL-2.0
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*
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* Telnet interface
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*/
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#ifndef TELNET_H
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#define TELNET_H
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typedef int (srv_tx_f) (void *cctx, const void *buf, int len);
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typedef int (srv_rx_f) (void *cctx, int timeout);
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typedef void (srv_ms_f) (void *cctx, int status);
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/* Telnet context */
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typedef struct {
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void *cctx; /* Client context */
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srv_tx_f *srv_tx; /* Write to server */
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srv_rx_f *srv_rx; /* Read from server */
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srv_ms_f *srv_ms; /* Modem status from server */
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unsigned int bytes_rx; /* Rx byte count */
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unsigned int off_rx; /* Rx buffer offset */
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unsigned char mode_telnet; /* Telnet mode */
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unsigned char mode_rfc2217; /* RFC-2217 mode */
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unsigned char telnet_ack[256]; /* telnet option ack counter */
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} tn_ctx_t;
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extern tn_ctx_t *telnet_ctx_init(void *cctx, srv_tx_f * ftx, srv_rx_f * frx,
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srv_ms_f * fss);
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extern int telnet_open(tn_ctx_t * tcc);
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extern int telnet_rx(tn_ctx_t * tcc, char *buf, int *plen);
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extern int telnet_tx(tn_ctx_t * tcc, const char *buf, int len);
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extern void telnet_set_opt(tn_ctx_t * tcc, int opt, int prm,
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const void *val, int len);
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extern void telnet_rfc2217_handle_opt(tn_ctx_t * tcc, int opt,
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unsigned char *pu, int nd);
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extern void telnet_rfc2217_cfg(tn_ctx_t * tcc, int cmd,
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const void *val, int nd);
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extern void telnet_rfc2217_ctl(tn_ctx_t * tcc, unsigned int val);
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/*RFC2217 modem state*/
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#define TNS_STATE_DCD 0x80
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#define TNS_STATE_RI 0x40
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#define TNS_STATE_DSR 0x20
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#define TNS_STATE_CTS 0x10
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/*RFC2217 configuration commands*/
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#define TNS_SET_BAUDRATE 1
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#define TNS_SET_DATASIZE 2
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#define TNS_SET_PARITY 3
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#define TNS_SET_STOPSIZE 4
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#define TNS_SET_CONTROL 5
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#define TNS_SET_PURGE 12
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/*RFC2217 control commands*/
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#define TNS_CTL_NOFLOW 1
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#define TNS_CTL_XONOFF 2
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#define TNS_CTL_CTSRTS 3
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#define TNS_CTL_DTR_ON 8
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#define TNS_CTL_DTR_OFF 9
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#define TNS_CTL_RTS_ON 11
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#define TNS_CTL_RTS_OFF 12
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#endif /*TELNET_H */
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@@ -0,0 +1,299 @@
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/*
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* Copyright (c) 2018 Lars Thrane A/S
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* SPDX-License-Identifier: GPL-2.0
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*
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* Telnet server - Telnet protocol handling
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "telnet.h"
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#include "telnet_param.h"
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/* Telnet commands */
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#if 0
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static const char *const tn_cmd[] = {
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"SE", "NOP", "MARK", "BRK", "IP", "AO", "AYT", "EC",
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"EL", "GA", "SB", "WILL", "WONT", "DO", "DONT", "IAC"
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};
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#endif
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#define OPT_NACK 0 /* Reject (DONT/WONT) */
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#define OPT_IGNORE 1 /* Ignore the command (?) */
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#define OPT_ACK 2 /* Acknowledge (DO /WILL) */
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/* Telnet option support */
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static const unsigned char tn_opt[256] = {
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/* *INDENT-OFF* */
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[TNO_BINARY] = OPT_ACK,
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[TNO_SUPP_GA] = OPT_ACK,
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// [TNO_TTYP] = OPT_NACK,
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// [TNO_NAWS] = OPT_NACK,
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// [TNO_NEO] = OPT_NACK,
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[TNO_CPCO] = OPT_ACK,
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// [TNO_KERMIT] = OPT_NACK,
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/* *INDENT-ON* */
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};
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static void _telnet_handle_req(tn_ctx_t * tcc, int cmd, int opt)
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{
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char buf[3];
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if (tcc->telnet_ack[opt] > 0)
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return;
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switch (tn_opt[opt])
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{
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default:
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case OPT_IGNORE:
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return;
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case OPT_ACK:
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cmd = TNC_FD_DO;
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break;
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case OPT_NACK:
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cmd = TNC_FE_DONT;
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break;
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}
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buf[0] = TNC_FF_IAC;
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buf[1] = cmd;
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buf[2] = opt;
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tcc->telnet_ack[opt]++;
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tcc->srv_tx(tcc->cctx, buf, 3);
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}
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static void _telnet_handle_resp(tn_ctx_t * tcc, int cmd, int opt)
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{
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if (opt == TNO_CPCO)
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{
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if (cmd == TNC_FD_DO)
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tcc->mode_rfc2217 = 1;
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}
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}
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void telnet_set_opt(tn_ctx_t * tcc, int opt, int prm, const void *val, int len)
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{
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unsigned char buf[128], *pu = buf;
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const unsigned char *pv;
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int i;
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*pu++ = TNC_FF_IAC;
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*pu++ = TNC_FA_SB;
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*pu++ = opt;
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*pu++ = prm;
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if (len > 0 && len <= 32)
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{
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pv = val;
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for (i = 0; i < len; i++)
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{
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*pu++ = *pv;
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if (*pv++ == TNC_FF_IAC)
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*pu++ = TNC_FF_IAC;
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}
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}
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*pu++ = TNC_FF_IAC;
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*pu++ = TNC_F0_SE;
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len = pu - buf;
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tcc->srv_tx(tcc->cctx, buf, len);
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}
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static void _telnet_handle_opt(tn_ctx_t * tcc, int opt,
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unsigned char *pu, int nd)
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{
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switch (opt)
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{
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default:
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break;
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case TNO_CPCO: /* RFC 2217 */
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tcc->mode_rfc2217 = 1;
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telnet_rfc2217_handle_opt(tcc, opt, pu, nd);
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break;
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}
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}
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int telnet_rx(tn_ctx_t * tcc, char *buf, int *plen)
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{
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char *s, *p;
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unsigned char *pu;
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int len, rem;
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int np, nd;
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int b1, b2;
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len = *plen;
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tcc->bytes_rx += len;
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if (len < (int)tcc->off_rx)
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tcc->off_rx = 0;
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for (s = buf + tcc->off_rx, rem = len - tcc->off_rx; rem > 0; s = p)
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{
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p = memchr(s, TNC_FF_IAC, rem);
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if (!p)
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break;
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/* We have IAC (= 0xff) */
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np = rem - (p - s); /* N. chars available incl. IAC */
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if (np < 2)
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return 1;
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pu = (unsigned char *)p;
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b1 = pu[1];
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switch (b1)
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{
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default:
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case TNC_F0_SE:
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case TNC_F1_NOP:
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case TNC_F2_MARK:
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case TNC_F3_BRK:
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case TNC_F4_IP:
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case TNC_F5_AO:
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case TNC_F6_AYT:
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case TNC_F7_EC:
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case TNC_F8_EL:
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case TNC_F9_GA:
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nd = 2; /* Drop 2 bytes */
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goto tn_drop;
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case TNC_FB_WILL:
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case TNC_FC_WONT:
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case TNC_FD_DO:
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case TNC_FE_DONT:
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if (np < 3)
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goto tn_more; /* Need more */
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tcc->mode_telnet = 1; /* Any such sequence activates TN */
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b2 = pu[2];
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if (b1 == TNC_FB_WILL)
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_telnet_handle_req(tcc, b1, b2);
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else if (b1 == TNC_FD_DO)
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_telnet_handle_resp(tcc, b1, b2);
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nd = 3; /* Drop 3 bytes */
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goto tn_drop;
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case TNC_FA_SB:
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for (nd = 2; nd < np - 1; nd++)
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{
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if (pu[nd] == TNC_FF_IAC && pu[nd + 1] == TNC_F0_SE)
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{
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nd -= 2;
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if (nd <= 0)
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break;
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b2 = pu[2];
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tcc->mode_telnet = 1; /* Any such sequence activates TN */
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_telnet_handle_opt(tcc, b2, pu + 3, nd - 1);
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nd += 4;
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goto tn_drop;
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}
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}
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if (np < 16)
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goto tn_more; /* Not done */
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/* This does not look right */
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rem = 0; /* Quit loop */
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break;
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case TNC_FF_IAC:
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p++;
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nd = 1; /* Drop 1 bytes */
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goto tn_drop;
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tn_drop:
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if (!tcc->mode_telnet)
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goto tn_break;
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rem -= nd + (p - s);
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len -= nd;
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memmove(p, p + nd, rem);
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break;
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tn_break:
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rem = 0; /* Quit loop */
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break;
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tn_more: /* Request more data */
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tcc->off_rx = len - np;
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*plen = len;
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return 1;
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}
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}
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tcc->off_rx = 0;
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*plen = len;
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return 0;
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}
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int telnet_tx(tn_ctx_t * tcc, const char *buf, int len)
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{
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const char *s, *p;
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int rem, nd;
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for (s = buf, rem = len; rem > 0; s = p)
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{
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if (tcc->mode_telnet)
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p = memchr(s, TNC_FF_IAC, rem);
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else
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p = NULL;
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if (!p)
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{
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/* Send the rest */
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nd = rem;
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tcc->srv_tx(tcc->cctx, s, nd);
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}
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else
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{
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nd = p - s + 1;
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tcc->srv_tx(tcc->cctx, s, nd);
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tcc->srv_tx(tcc->cctx, p, 1); /* One TNC_FF_IAC */
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p++;
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}
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rem -= nd;
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}
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return 0;
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}
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int telnet_open(tn_ctx_t * tcc)
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{
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time_t t = time(NULL);;
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char buf[3];
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int res;
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buf[0] = TNC_FF_IAC;
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buf[1] = TNC_FB_WILL;
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buf[2] = TNO_CPCO;
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tcc->srv_tx(tcc->cctx, buf, 3);
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while (1)
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{
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res = tcc->srv_rx(tcc->cctx, 1000);
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if (res <= 0)
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return -1;
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else if (tcc->mode_rfc2217)
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return 0;
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else if (t - time(NULL) > 2)
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return -1;
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}
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}
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tn_ctx_t *telnet_ctx_init(void *cctx, srv_tx_f * ftx,
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srv_rx_f * frx, srv_ms_f * fms)
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{
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tn_ctx_t *tcc;
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tcc = calloc(1, sizeof(tn_ctx_t));
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tcc->cctx = cctx;
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tcc->srv_tx = ftx; /* Write to server */
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tcc->srv_rx = frx; /* Read from server */
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tcc->srv_ms = fms; /* Set modem state */
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return tcc;
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}
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@@ -0,0 +1,123 @@
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/*
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* Copyright (c) 2018 Lars Thrane A/S
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* SPDX-License-Identifier: GPL-2.0
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*
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* Telnet parameters
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*/
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#ifndef TELNET_PARAM_H
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#define TELNET_PARAM_H
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/*
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* Telnet commands
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*/
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#define TNC_F0_SE (0xf0) /* End of subnegotiation parameters */
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#define TNC_F1_NOP (0xf1) /* No operation */
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#define TNC_F2_MARK (0xf2) /* The data stream portion of a Synch.
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This should always be accompanied
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by a TCP Urgent notification. */
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#define TNC_F3_BRK (0xf3) /* NVT character BRK. */
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#define TNC_F4_IP (0xf4) /* The function IP (interrupt process) */
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#define TNC_F5_AO (0xf5) /* The function AO (abort output) */
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#define TNC_F6_AYT (0xf6) /* The function AYT (are you there) */
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#define TNC_F7_EC (0xf7) /* The function EC (erase charceter) */
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#define TNC_F8_EL (0xf8) /* The function EL (erase line) */
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#define TNC_F9_GA (0xf9) /* The GA signal (go ahead) */
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#define TNC_FA_SB (0xfa) /* Subnegotiation begin */
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#define TNC_FB_WILL (0xfb) /* Indicates the desire to begin
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performing, or confirmation that
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you are now performing, the
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indicated option. */
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#define TNC_FC_WONT (0xfc) /* Indicates the refusal to perform,
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or continue performing, the
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indicated option. */
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#define TNC_FD_DO (0xfd) /* Indicates the request that the
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other party perform, or
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confirmation that you are expecting
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the other party to perform, the
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indicated option. */
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#define TNC_FE_DONT (0xfe) /* Indicates the demand that the
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other party stop performing,
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or confirmation that you are no
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longer expecting the other party
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to perform, the indicated option. */
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#define TNC_FF_IAC (0xff) /* Interpret as Command / data byte */
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/*
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* Telnet options
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*/
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/*
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* https://www.iana.org/assignments/telnet-options/telnet-options.xhtml
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*
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* 0 Binary Transmission [RFC856]
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* 1 Echo [RFC857]
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* 2 Reconnection [DDN Protocol Handbook, ... ]
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* 3 Suppress Go Ahead [RFC858]
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* 4 Approx Message Size Negotiation ["The Ethernet, ... ]
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* 5 Status [RFC859]
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* 6 Timing Mark [RFC860]
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* 7 Remote Controlled Trans and Echo [RFC726]
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* 8 Output Line Width [DDN Protocol Handbook, ... ]
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* 9 Output Page Size [DDN Protocol Handbook, ... ]
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* 10 Output Carriage-Return Disposition [RFC652]
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* 11 Output Horizontal Tab Stops [RFC653]
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* 12 Output Horizontal Tab Disposition [RFC654]
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* 13 Output Formfeed Disposition [RFC655]
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* 14 Output Vertical Tabstops [RFC656]
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* 15 Output Vertical Tab Disposition [RFC657]
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* 16 Output Linefeed Disposition [RFC658]
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* 17 Extended ASCII [RFC698]
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* 18 Logout [RFC727]
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* 19 Byte Macro [RFC735]
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* 20 Data Entry Terminal [RFC1043][RFC732]
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* 21 SUPDUP [RFC736][RFC734]
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* 22 SUPDUP Output [RFC749]
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* 23 Send Location [RFC779]
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* 24 Terminal Type [RFC1091]
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* 25 End of Record [RFC885]
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* 26 TACACS User Identification [RFC927]
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* 27 Output Marking [RFC933]
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* 28 Terminal Location Number [RFC946]
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* 29 Telnet 3270 Regime [RFC1041]
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* 30 X.3 PAD [RFC1053]
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* 31 Negotiate About Window Size [RFC1073]
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* 32 Terminal Speed [RFC1079]
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* 33 Remote Flow Control [RFC1372]
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* 34 Linemode [RFC1184]
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* 35 X Display Location [RFC1096]
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* 36 Environment Option [RFC1408]
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* 37 Authentication Option [RFC2941]
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* 38 Encryption Option [RFC2946]
|
||||
* 39 New Environment Option [RFC1572]
|
||||
* 40 TN3270E [RFC2355]
|
||||
* 41 XAUTH [Rob_Earhart]
|
||||
* 42 CHARSET [RFC2066]
|
||||
* 43 Telnet Remote Serial Port (RSP) [Robert_Barnes]
|
||||
* 44 Com Port Control Option [RFC2217]
|
||||
* 45 Telnet Suppress Local Echo [Wirt_Atmar]
|
||||
* 46 Telnet Start TLS [Michael_Boe]
|
||||
* 47 KERMIT [RFC2840]
|
||||
* 48 SEND-URL [David_Croft]
|
||||
* 49 FORWARD_X [Jeffrey_Altman]
|
||||
* 50-137 Unassigned [IANA]
|
||||
* 138 TELOPT PRAGMA LOGON [Steve_McGregory]
|
||||
* 139 TELOPT SSPI LOGON [Steve_McGregory]
|
||||
* 140 TELOPT PRAGMA HEARTBEAT [Steve_McGregory]
|
||||
* 141-254 Unassigned
|
||||
* 255 Extended-Options-List [RFC861]
|
||||
*/
|
||||
|
||||
#define TNO_BINARY 0 /* Binary Transmission */
|
||||
#define TNO_ECHO 1 /* Echo */
|
||||
#define TNO_SUPP_GA 3 /* Suppress Go Ahead */
|
||||
#define TNO_LOGOUT 18 /* Logout */
|
||||
#define TNO_TTYP 24 /* Terminal Type */
|
||||
#define TNO_NAWS 31 /* Negotiate About Window Size */
|
||||
#define TNO_NEO 39 /* New Environment Option */
|
||||
#define TNO_CPCO 44 /* RFC 2217 */
|
||||
#define TNO_KERMIT 47 /* Kermit */
|
||||
|
||||
#endif /* TELNET_PARAM_H */
|
||||
@@ -0,0 +1,54 @@
|
||||
/*
|
||||
* Copyright (c) 2018 Lars Thrane A/S
|
||||
* SPDX-License-Identifier: GPL-2.0
|
||||
*
|
||||
* Telnet server - RFC-2217 handling
|
||||
*/
|
||||
|
||||
#include <stddef.h>
|
||||
|
||||
#include "telnet.h"
|
||||
#include "telnet_param.h"
|
||||
|
||||
void telnet_rfc2217_handle_opt(tn_ctx_t * tcc, int opt,
|
||||
unsigned char *pu, int nd)
|
||||
{
|
||||
unsigned int sub;
|
||||
|
||||
sub = pu[0];
|
||||
switch (sub)
|
||||
{
|
||||
default:
|
||||
break;
|
||||
case 100: /* SIGNATURE */
|
||||
telnet_set_opt(tcc, opt, 0, "LT-NVT", 6);
|
||||
break;
|
||||
case 106: /* NOTIFY-LINESTATE */
|
||||
break;
|
||||
case 107: /* NOTIFY-MODEMSTATE */
|
||||
if (tcc->srv_ms)
|
||||
tcc->srv_ms(tcc->cctx, pu[1]);
|
||||
break;
|
||||
case 108: /* FLOWCONTROL-SUSPEND */
|
||||
case 109: /* FLOWCONTROL-RESUME */
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void telnet_rfc2217_cfg(tn_ctx_t * tcc, int cmd, const void *val, int nd)
|
||||
{
|
||||
if (!tcc->mode_rfc2217)
|
||||
return;
|
||||
|
||||
telnet_set_opt(tcc, TNO_CPCO, cmd, val, nd);
|
||||
}
|
||||
|
||||
void telnet_rfc2217_ctl(tn_ctx_t * tcc, unsigned int val)
|
||||
{
|
||||
unsigned char byte = val;
|
||||
|
||||
if (!tcc->mode_rfc2217)
|
||||
return;
|
||||
|
||||
telnet_set_opt(tcc, TNO_CPCO, TNS_SET_CONTROL, &byte, 1);
|
||||
}
|
||||
+1252
File diff suppressed because it is too large
Load Diff
Reference in New Issue
Block a user