On Sat, Feb 9, 2019 Cristian Ionescu-Idbohrn wrote:
> In my case (at work), I have to watch and prevent people from doing
> unportable things. For me, that's a burden.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Process substitution is a Korn shell feature that's also available
in bash and some other shells. This patch implements process
substitution in ash when ASH_BASH_COMPAT is enabled.
function old new delta
argstr 1386 1522 +136
strtodest - 52 +52
readtoken1 3346 3392 +46
.rodata 183206 183250 +44
unwindredir - 28 +28
cmdloop 365 372 +7
static.spclchars 10 12 +2
cmdputs 380 367 -13
exitreset 86 69 -17
evalcommand 1754 1737 -17
varvalue 675 634 -41
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text data bss dec hex filename
953967 4219 1904 960090 ea65a busybox_old
954192 4219 1904 960315 ea73b busybox_unstripped
v2: Replace array of file descriptors with a linked list.
Include tests that were unaccountably omitted from v1.
v3: Update linked list code to the intended version.
v4: Change order of conditional code in cmdputs().
v5: Use existing popredir() mechanism to manage file descriptors.
v6: Rebase to latest version of BusyBox ash. Reduce code churn.
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The SOURCE_DATE_EPOCH is an effort of the Reproducible Builds
organization to make timestamps/build dates in compiled tools
deterministic over several repetitive builds.
Busybox shows by default the build date timestamp which changes whenever
compiled. To have a reasonable accurate build date while staying
reproducible, it's possible to use the *date of last source
modification* rather than the current time and date.
Further information on SOURCE_DATE_EPOCH are available online [1].
This patch modifies `confdata.c` so that the content of the
SOURCE_DATE_EPOCH env variable is used as timestamp.
To be independent of different timezones between builds, whenever
SOURCE_DATE_EPOCH is defined the GMT time is used.
[1]: https://reproducible-builds.org/docs/source-date-epoch/
Signed-off-by: Paul Spooren <mail@aparcar.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The original commit 3bef5d89b0 introduced an additional check
for an unset `opt_d` before doing word splitting. I'm unsure
why it's there in the first place, but the commit message also
describes a different behaviour than what -d actually does in
bash, while the code mostly does the right thing.
`opt_d` sets the line delimiter for read to stop reading and
should not affect word splitting.
Testcase:
$ echo qwe rty | { read -d Z a b; echo a:$a b:$b; }
a:qwe b:rty
function old new delta
shell_builtin_read 1314 1304 -10
Signed-off-by: Eicke Herbertz <wolletd@posteo.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
When include/applets.h is re-generated
it generates code macros in include/applets.h e.g.
IF_XZCAT(APPLET_ODDNAME(xzcat, unxz, BB_DIR_USR_BIN, BB_SUID_DROP, xzcat))
...
IF_CHVT(APPLET_NOEXEC(chvt, chvt, BB_DIR_USR_BIN, BB_SUID_DROP, chvt))
...
sed is used to process source files like below to feed into this header
generation
sed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c
this means we let shell decide the order of .c files being fed into sed
tool, applets.h has code snippets thats generated out of code fragments
from these .c files and the order of the generated code depends on the
order of .c files being fed to sed and then piped to generate tool, even
though the generated code is logically same, it does result in re-odered
code in applets.h based on which shell was used during build on exact busybox
sources since sort order is different based on chosen locale and also default shell
being bash or dash
This sets the environment variable LC_ALL to the value C, which will
enforce bytewise sorting, irrespective of the shell
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
"-x vendor:VENDOR" will not be a trivial replacement of it:
(1) by default, we do send a vendor string ("udhcp BB_VER"),
will need code to preserve the default.
(2) -V '' currently disables vendor string. -x vendor:''
would not easily achieve that: it adds no option at all
(string options can't be empty), and default (1) would trigger.
To avoid that, we will need yet another hack to detect
-x vendor:'' and interpret that as "no vendor string at all".
IOW: removing -V is likely to increase code size, not decrease.
function old new delta
udhcpc_main 2563 2555 -8
.rodata 103251 103198 -53
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
While at it, rename bb_signals_recursive_norestart() to bb_signals_norestart():
"recursive" was implying we are setting SA_NODEFER allowing signal handler
to be entered recursively, but we do not do that.
function old new delta
bb_signals_norestart - 70 +70
startservice 380 394 +14
bb_signals_recursive_norestart 70 - -70
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The TERM variable is usually set to "dumb" to indicate that the terminal
does not support any ANSI escape sequences. Presently, ls does not honor
this variable and outputs colors anyhow which results in unreadable
output, unless the user explicitly disables colors using `ls
--color=never`. The rational behind this change is that ls should "just
work" by default, even on dumb terminals.
For this reason, this patch adds a check which additionally consults the
TERM variable before printing any colors. This is analogous to the
existing check for ensuring that standard output is a tty. As such,
colors can still be forced with `--color=force`, even if TERM is set to
dumb.
function old new delta
is_TERM_dumb - 40 +40
ls_main 579 598 +19
.rodata 103246 103251 +5
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(add/remove: 1/0 grow/shrink: 2/0 up/down: 64/0) Total: 64 bytes
Signed-off-by: Sören Tempel <soeren+git@soeren-tempel.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Even following current Internet standards, it can be perfectly
legitimate to issue IPv4 addresses that end in .0 or .255 via DHCP --
this can happen whenever the network is larger than /8. For example,
10.3.4.0 and 10.3.4.255 are legitimate host addresses in 10/8 or 10.3/16.
(We also want to be able to issue .0 addresses in smaller networks
following our proposed kernel patch and standards changes.)
This behavior is already fully controllable by the user, simply by
setting start_ip and end_ip correctly. Users who don't want to issue
.0 or .255 should set start_ip greater than .0 or end_ip less than .255
and udhcpd will already respect these bounds. (This is also the case
for other DHCP servers -- the recommended example configurations will
default to a lower bound starting with .1 or some other value, which is
typically appropriate, but the user is still allowed to change this to
.0 -- or to a range that overlaps a .0 or .255 address -- if so desired.)
Signed-off-by: Seth David Schoen <schoen@loyalty.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
SRV lookups are supported since "6b4960155 nslookup: implement support
for SRV records" and should therefore be mentioned as a possible
QUERY_TYPE in the help message.
Signed-off-by: Paul Spooren <mail@aparcar.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This restores old behavior where we slept for 1/2 of lease, then tried renewing,
thel slept for 1/4 and tried again, etc. But now we will NOT be listening to
all packets for 1/2 of lease time, processing (rejecting) everyone else's
DHCP traffic.
We'll go back to bound state, where we have no listening socket at all.
function old new delta
udhcpc6_main 2600 2655 +55
udhcpc_main 2608 2625 +17
.rodata 103250 103249 -1
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(add/remove: 0/0 grow/shrink: 2/1 up/down: 72/-1) Total: 71 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
client_data.vendorclass, .hostname and .fqdn probably need the same treatment:
just insert them into the list of -x opts, get rid of
if (client_data.vendorclass)
udhcp_add_binary_option(packet, client_data.vendorclass);
if (client_data.hostname)
udhcp_add_binary_option(packet, client_data.hostname);
if (client_data.fqdn)
udhcp_add_binary_option(packet, client_data.fqdn);
function old new delta
udhcp_insert_new_option - 166 +166
perform_release 171 207 +36
perform_d6_release 227 259 +32
udhcpc6_main 2558 2580 +22
init_d6_packet 103 84 -19
udhcpc_main 2585 2564 -21
attach_option 397 253 -144
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(add/remove: 1/0 grow/shrink: 3/3 up/down: 256/-184) Total: 72 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Lines that have no content apart from automatic indentation should
be treated as empty when the user hits return or ESC.
The implementation uses the global variable 'indentcol'. Usually
this is zero. It can also be -1 to indicate an 'O' (open above)
command, replacing the overloading of the tabstop option bit.
A value greater than zero indicates that the current line has
been autoindented to the given column (or that the autoindent has
been adjusted with ctrl-D). Any other change to the line resets
'indentcol' to zero.
Replace strspn() with ident_len(). The latter handles the unlikely
case that it's called on the last line of a file which doesn't have
a terminating newline.
function old new delta
char_insert 741 912 +171
indent_len - 42 +42
do_cmd 4781 4785 +4
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Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Autoindent took a copy of the indent from a neighbouring line, which
may not have respected the expandtab setting.
Determine the target column and construct a suitable indent. This
will consist entirely of spaces if expandtab is enabled or an
efficient combination of tabs and spaces otherwise.
function old new delta
char_insert 719 741 +22
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Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Commit 24effc7a3 (vi: cursor positioning after whole-line 'y')
tried to save a few bytes by treating whole-line deletion the
same as whole-line yank. If the deletion removed the last lines
of the file the cursor was left beyond the end of the file.
Revert the part of the commit related to whole-line deletion.
Position the cursor on the first non-whitespace character of the
line when whole lines are 'put'.
function old new delta
do_cmd 4759 4781 +22
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Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
As reported in bug 13776, before this fix the renew never times out.
function old new delta
udhcpc_main 2541 2585 +44
udhcpc6_main 2567 2558 -9
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
For one, an attacker can try to overload us by just opening and immediately
closing tons of connections - reduce our work to the minimum for this case.
function old new delta
handle_incoming_and_exit 2172 2200 +28
.rodata 103225 103246 +21
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 49/0) Total: 49 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This makes proxy work for any type of requests.
function old new delta
handle_incoming_and_exit 2240 2172 -68
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
':wq' or ':x' should issue a warning if there are more files to edit,
unless they're followed by '!'.
function old new delta
colon 3911 3960 +49
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Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The 'y' command to yank text should leave the cursor at the start
of the range. This mostly works correctly in BusyBox vi but not
for whole-line yanks with backward motion, e.g. '2yk' to yank two
lines backwards. In this case the cursor is left at the end of the
range.
Fix this by returning the actual range from find_range(). Cursor
positioning following whole-line deletion is inconsistent between
vim and traditional vi. For BusyBox vi chose the option that uses
least code without being exactly compatible with either.
Also, find_range() preserved the value of 'dot', the current cursor
position. Since this isn't used by either caller of find_range()
we can save a few bytes by not bothering.
function old new delta
do_cmd 4730 4759 +29
find_range 749 686 -63
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(add/remove: 0/0 grow/shrink: 1/1 up/down: 29/-63) Total: -34 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
