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drivers/net: Add support for telnet character mode

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Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
This commit is contained in:
Masayuki Ishikawa 2018-01-09 20:16:02 +09:00
parent 7d4451ee86
commit 324008c1e5
2 changed files with 36 additions and 0 deletions
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8
drivers/net/Kconfig
View File

@ -41,6 +41,14 @@ config TELNET_DUMPBUFFER
default n
depends on DEBUG_NET
config TELNET_CHARACTER_MODE
bool "Character mode"
default n
---help---
The Telnet daemon works in character mode. In this case, the deamon
will echo a character which telnet client sent. By default, it works
in line mode.
endif # NETDEV_TELNET
config ARCH_HAVE_NETDEV_STATISTICS

28
drivers/net/telnet.c
View File

@ -84,6 +84,9 @@
#define ISO_nl 0x0a
#define ISO_cr 0x0d
#define TELNET_SGA 0x03 /* Suppress Go Ahead */
#define TELNET_ECHO 0x01
#define TELNET_IAC 255
#define TELNET_WILL 251
#define TELNET_WONT 252
@ -251,9 +254,11 @@ static void telnet_getchar(FAR struct telnet_dev_s *priv, uint8_t ch,
{
register int index;
#ifndef CONFIG_TELNET_CHARACTER_MODE
/* Ignore carriage returns */
if (ch != ISO_cr)
#endif
{
/* Add all other characters to the destination buffer */
@ -334,9 +339,32 @@ static ssize_t telnet_receive(FAR struct telnet_dev_s *priv, FAR const char *src
break;
case STATE_DO:
#ifdef CONFIG_TELNET_CHARACTER_MODE
if (ch == TELNET_SGA)
{
/* If it received 'Suppress Go Ahead', reply with a WILL */
telnet_sendopt(priv, TELNET_WILL, ch);
/* Also, send 'WILL ECHO' */
telnet_sendopt(priv, TELNET_WILL, TELNET_ECHO);
}
else if (ch == TELNET_ECHO)
{
/* If it received 'ECHO', then do nothing */
}
else
{
/* Reply with a WONT */
telnet_sendopt(priv, TELNET_WONT, ch);
}
#else
/* Reply with a WONT */
telnet_sendopt(priv, TELNET_WONT, ch);
#endif
priv->td_state = STATE_NORMAL;
break;