Kim Woelders
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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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_CD 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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