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Extend `autoboot_delay' handling - is this variable is set to -1 don't allow

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user to interrupt autoboot process at all. Currently, even when
`autoboot_delay' is set to 0, loader(8) still allows autoboot process to be
interrupted by pressing any key on the console when the loader reads kernel
and modules from the disk. In some cases (i.e. untrusted environment) such
behaviour is highly indesirable and user should not be allowed to interfere
with the autoboot process at all.

Sponsored by:	PBXpress Inc.
MFC after:	3 days
This commit is contained in:
Maxim Sobolev 2005-05-19 23:03:02 +00:00
parent cf87ad7afd
commit 4d87b291ad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=146421
4 changed files with 67 additions and 26 deletions
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55
sys/boot/common/boot.c
View File

@ -166,15 +166,14 @@ autoboot(int timeout, char *prompt)
autoboot_tried = 1;
if (timeout == -1) {
timeout = 10;
/* try to get a delay from the environment */
if ((cp = getenv("autoboot_delay"))) {
timeout = strtol(cp, &ep, 0);
if (cp == ep)
timeout = -1;
timeout = 10; /* Unparseable? Set default! */
}
}
if (timeout == -1) /* all else fails */
timeout = 10;
kernelname = getenv("kernelname");
if (kernelname == NULL) {
@ -187,32 +186,38 @@ autoboot(int timeout, char *prompt)
}
}
otime = time(NULL);
when = otime + timeout; /* when to boot */
yes = 0;
if (timeout >= 0) {
otime = time(NULL);
when = otime + timeout; /* when to boot */
printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
yes = 0;
for (;;) {
if (ischar()) {
c = getchar();
if ((c == '\r') || (c == '\n'))
yes = 1;
break;
}
ntime = time(NULL);
if (ntime >= when) {
yes = 1;
break;
}
printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt);
if (ntime != otime) {
printf("\rBooting [%s] in %d second%s... ",
kernelname, (int)(when - ntime),
(when-ntime)==1?"":"s");
otime = ntime;
}
for (;;) {
if (ischar()) {
c = getchar();
if ((c == '\r') || (c == '\n'))
yes = 1;
break;
}
ntime = time(NULL);
if (ntime >= when) {
yes = 1;
break;
}
if (ntime != otime) {
printf("\rBooting [%s] in %d second%s... ",
kernelname, (int)(when - ntime),
(when-ntime)==1?"":"s");
otime = ntime;
}
}
} else {
yes = 1;
}
if (yes)
printf("\rBooting [%s]... ", kernelname);
putchar('\n');

2
sys/boot/common/help.common
View File

@ -133,6 +133,8 @@
set autoboot_delay=<value>
Sets the default delay for the autoboot command to <value> seconds.
Set value to -1 if you don't want to allow user to interrupt autoboot
process and escape to the loader prompt.
################################################################################
# Tset Sbootfile DSet the default boot file set

31
sys/boot/common/loader.8
View File

@ -111,6 +111,21 @@ If the system gets past this point,
will be set and
.Nm
will engage interactive mode.
Please note that historically even when
.Va autoboot_delay
is set to
.Dq 0
user will be able to interrupt autoboot process by pressing some key
on the console while kernel and modules are being loaded. In some
cases such behaviour may be undesirable, to prevent it set
.Va autoboot_delay
to
.Dq -1 ,
in this case
.Nm
will engage interactive mode only if
.Ic autoboot
has failed.
.Sh BUILTIN COMMANDS
In
.Nm ,
@ -329,6 +344,22 @@ will be automatically attempted after processing
though explicit
.Ic autoboot Ns 's
will be processed normally, defaulting to 10 seconds delay.
.Pp
If set to
.Dq 0
no delay will inserted, but user still will be able to interrupt
.Ic autoboot
process and escape into the interactive mode by pressing some key
on the console while kernel and
modules are being loaded.
.Pp
If set to
.Dq -1
no delay will inserted and
.Nm
will engange interactive mode only if
.Ic autoboot
has failed for some reason.
.It Va boot_askname
Instructs the kernel to prompt the user for the name of the root device
when the kernel is booted.

5
sys/boot/forth/loader.conf
View File

@ -42,7 +42,10 @@ loader_color="NO" # Set this to YES to enable splash screen colors
### Loader settings ########################################
##############################################################
#autoboot_delay="10" # Delay in seconds before autobooting
#autoboot_delay="10" # Delay in seconds before autobooting,
# set to -1 if you don't want user to be
# allowed to interrupt autoboot process and
# escape to the loader prompt
#beastie_disable="NO" # Turn the beastie boot menu on and off
#console="vidconsole" # Set the current console
#currdev="disk1s1a" # Set the current device