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uxpty: give pty_backend_create a struct ssh_ttymodes.

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This will be applied to the pty's termios settings at creation time,
superseding the default settings uxpty has always used. It works by
including the new sshttymodes.h with TTYMODES_LOCAL_ONLY defined, so
that modes not supported by a particular Unix system are automatically
quietly ignored.

Of course, a struct ssh_ttymodes always has the option of representing
"please make no change to the defaults", and of course, that's
precisely what is done by the one that pty_init constructs for clients
that aren't calling pty_backend_create directly.
This commit is contained in:
Simon Tatham 2018-10-18 20:37:33 +01:00
parent 105672e324
commit f2edea161a
1 changed files with 38 additions and 2 deletions
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40
unix/uxpty.c
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@ -21,8 +21,10 @@
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <termios.h>
#include "putty.h"
#include "ssh.h"
#include "tree234.h"
#ifndef OMIT_UTMP
@ -739,6 +741,35 @@ static void pty_uxsel_setup(Pty *pty)
uxsel_set(pty_signal_pipe[0], 1, pty_select_result);
}
static void copy_ttymodes_into_termios(
struct termios *attrs, struct ssh_ttymodes modes)
{
#define TTYMODE_CHAR(name, ssh_opcode, cc_index) { \
if (modes.have_mode[ssh_opcode]) \
attrs->c_cc[cc_index] = modes.mode_val[ssh_opcode]; \
}
#define TTYMODE_FLAG(flagval, ssh_opcode, field, flagmask) { \
if (modes.have_mode[ssh_opcode]) { \
attrs->c_##field##flag &= ~flagmask; \
if (modes.mode_val[ssh_opcode]) \
attrs->c_##field##flag |= flagval; \
} \
}
#define TTYMODES_LOCAL_ONLY /* omit any that this platform doesn't know */
#include "sshttymodes.h"
#undef TTYMODES_LOCAL_ONLY
#undef TTYMODE_CHAR
#undef TTYMODE_FLAG
if (modes.have_mode[TTYMODE_ISPEED])
cfsetispeed(attrs, modes.mode_val[TTYMODE_ISPEED]);
if (modes.have_mode[TTYMODE_OSPEED])
cfsetospeed(attrs, modes.mode_val[TTYMODE_OSPEED]);
}
/*
* The main setup function for the pty back end. This doesn't match
* the signature of backend_init(), partly because it has to be able
@ -748,7 +779,8 @@ static void pty_uxsel_setup(Pty *pty)
* and port numbers.
*/
Backend *pty_backend_create(
Seat *seat, LogContext *logctx, Conf *conf, char **argv)
Seat *seat, LogContext *logctx, Conf *conf, char **argv,
struct ssh_ttymodes ttymodes)
{
int slavefd;
pid_t pid, pgrp;
@ -902,6 +934,8 @@ Backend *pty_backend_create(
attrs.c_iflag &= ~IUTF8;
#endif
copy_ttymodes_into_termios(&attrs, ttymodes);
tcsetattr(0, TCSANOW, &attrs);
}
@ -1058,7 +1092,9 @@ static const char *pty_init(Seat *seat, Backend **backend_handle,
const char *host, int port,
char **realhost, int nodelay, int keepalive)
{
*backend_handle= pty_backend_create(seat, logctx, conf, pty_argv);
struct ssh_ttymodes modes;
memset(&modes, 0, sizeof(modes));
*backend_handle= pty_backend_create(seat, logctx, conf, pty_argv, modes);
*realhost = dupstr("");
return NULL;
}