initial

2018-06-19 15:38:46 +02:00
commit 6556a2ec50
7 changed files with 1452 additions and 0 deletions
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2018 Lars Thrane A/S
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Telnet interface
+ */
+#ifndef TELNET_H
+#define TELNET_H
+
+typedef int     (srv_tx_f) (void *cctx, const void *buf, int len);
+typedef int     (srv_rx_f) (void *cctx, int timeout);
+typedef void    (srv_ms_f) (void *cctx, int status);
+
+/* Telnet context */
+typedef struct {
+    void           *cctx;       /* Client context */
+
+    srv_tx_f       *srv_tx;     /* Write to server */
+    srv_rx_f       *srv_rx;     /* Read from server */
+    srv_ms_f       *srv_ms;     /* Modem status from server */
+
+    unsigned int    bytes_rx;   /* Rx byte count */
+    unsigned char   mode_telnet;        /* Telnet mode */
+    unsigned char   mode_rfc2217;       /* RFC-2217 mode */
+    unsigned char   telnet_ack[256];   /* telnet option ack counter */
+} tn_ctx_t;
+
+extern tn_ctx_t *telnet_ctx_init(void *cctx, srv_tx_f * ftx, srv_rx_f * frx,
+                                 srv_ms_f * fss);
+
+extern int      telnet_open(tn_ctx_t * tcc);
+
+extern int      telnet_rx(tn_ctx_t * tcc, char *buf, size_t *plen);
+extern int      telnet_tx(tn_ctx_t * tcc, const char *buf, int len);
+
+extern void     telnet_set_opt(tn_ctx_t * tcc, int opt, int prm,
+                                 const void *val, int len);
+
+extern void     telnet_rfc2217_handle_opt(tn_ctx_t * tcc, int opt,
+                                          unsigned char *pu, int nd);
+
+extern void     telnet_rfc2217_cfg(tn_ctx_t * tcc, int cmd,
+                                   const void *val, int nd);
+extern void     telnet_rfc2217_ctl(tn_ctx_t * tcc, int cmd);
+
+/*RFC2217 modem state*/
+#define TNS_STATE_CD     0x80
+#define TNS_STATE_RI     0x40
+#define TNS_STATE_DSR    0x20
+#define TNS_STATE_CTS    0x10
+
+/*RFC2217 configuration commands*/
+#define TNS_SET_BAUDRATE    1
+#define TNS_SET_DATASIZE    2
+#define TNS_SET_PARITY      3
+#define TNS_SET_STOPSIZE    4
+#define TNS_SET_CONTROL     5
+#define TNS_SET_PURGE      12
+
+/*RFC2217 control commands*/
+#define TNS_CTL_NOFLOW      1
+#define TNS_CTL_XONOFF      2
+#define TNS_CTL_CTSRTS      3
+#define TNS_CTL_DTR_ON      8
+#define TNS_CTL_DTR_OFF     9
+#define TNS_CTL_RTS_ON     11
+#define TNS_CTL_RTS_OFF    12
+
+#endif /*TELNET_H */