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Add a new flag to /etc/ttys: onifconsole. This is equivalent to "on" if the

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device is an active kernel console and "off" otherwise. This is designed to
allow serial-booting x86 systems to provide a login prompt on the serial line
by default without providing one on all systems by default.

Comments and suggestions by:	grehan, dteske, jilles
MFC after:	1 month
This commit is contained in:
Nathan Whitehorn 2014-01-20 18:15:06 +00:00
parent 2f0df38779
commit 0894229871
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=260913
3 changed files with 41 additions and 2 deletions
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1
include/ttyent.h
View file

@ -37,6 +37,7 @@
#define _TTYS_OFF "off"
#define _TTYS_ON "on"
#define _TTYS_ONIFCONSOLE "onifconsole"
#define _TTYS_SECURE "secure"
#define _TTYS_INSECURE "insecure"
#define _TTYS_WINDOW "window"

35
lib/libc/gen/getttyent.c
View file

@ -39,6 +39,9 @@ __FBSDID("$FreeBSD$");
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include <sys/sysctl.h>
static char zapchar;
static FILE *tf;
static size_t lbsize;
@ -64,6 +67,36 @@ getttynam(const char *tty)
return (t);
}
static int
auto_tty_status(const char *ty_name)
{
size_t len;
char *buf, *cons, *nextcons;
/* Check if this is an enabled kernel console line */
buf = NULL;
if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1)
return (0); /* Errors mean don't enable */
buf = malloc(len);
if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1)
goto done;
if ((cons = strchr(buf, '/')) == NULL)
goto done;
*cons = '\0';
nextcons = buf;
while ((cons = strsep(&nextcons, ",")) != NULL && strlen(cons) != 0) {
if (strcmp(cons, ty_name) == 0) {
free(buf);
return (TTY_ON);
}
}
done:
free(buf);
return (0);
}
struct ttyent *
getttyent(void)
{
@ -126,6 +159,8 @@ getttyent(void)
tty.ty_status &= ~TTY_ON;
else if (scmp(_TTYS_ON))
tty.ty_status |= TTY_ON;
else if (scmp(_TTYS_ONIFCONSOLE))
tty.ty_status |= auto_tty_status(tty.ty_name);
else if (scmp(_TTYS_SECURE))
tty.ty_status |= TTY_SECURE;
else if (scmp(_TTYS_INSECURE))

7
libexec/getty/ttys.5
View file

@ -102,8 +102,11 @@ ttys as a group.
.Pp
As flag values, the strings ``on'' and ``off'' specify that
.Xr init 8
should (should not) execute the command given in the second field,
while ``secure'' (if ``on'' is also specified) allows users with a
should (should not) execute the command given in the second field.
``onifconsole'' will cause this line to be enabled if and only if it is
an active kernel console device (it is equivalent to ``on'' in this
case).
The flag ``secure'' (if the console is enabled) allows users with a
uid of 0 to login on
this line.
The flag ``dialin'' indicates that a tty entry describes a dialin