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Fix sshd server to not send back space erase when no character in the line

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sshd server keeps count of characters typed on a line and will not send
backspace erase to the client if no character is there to erase on the
line even if the users is typing backspaces. This avoids erase of shell
prompt characters for visual user friendliness.
This commit is contained in:
quamrulmina 2015-11-04 17:08:18 -06:00
parent 9ec4bf235c
commit bf2766ba2d
1 changed files with 16 additions and 3 deletions
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19
channels.c
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@ -2410,6 +2410,9 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
const u_char *data;
u_int data_len, win_len;
Channel *c;
#ifdef WIN32_FIXME
static charinline = 0; // counts characters in a line for sshd in tty mode
#endif
/* Get the channel number and verify it. */
id = packet_get_int();
@ -2476,9 +2479,19 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
else {
buffer_append(&c->output, data, data_len); // it is the sshd server, so pass it on
if ( c->isatty ) { // we echo the data if it is sshd server and pty interactive mode
buffer_append(&c->input, data, data_len);
if ( (data_len ==1) && (data[0] == '\b') )
buffer_append(&c->input, " \b", 2); // for backspace, we need to send space and another backspace for visual erase
if ( (data_len ==1) && (data[0] == '\b') ) {
if (charinline >0) {
buffer_append(&c->input, "\b \b", 3); // for backspace, we need to send space and another backspace for visual erase
charinline--;
}
}
else {
buffer_append(&c->input, data, data_len);
charinline += data_len; // one more char on the line
}
if ( (data[data_len-1] == '\r') || (data[data_len-1] == '\n') )
charinline = 0; // a line has ended, begin char in line count again
}
}
}