6937487be7
Back in 2007, commit 0c97c9d437 ("'simple' error message functions by
Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower
overhead call to bb_perror_msg() when only a string was being printed
with no parameters. This saves space for some CPU architectures because
it avoids the overhead of a call to a variadic function. However there
has never been a simple version of bb_error_msg(), and since 2007 many
new calls to bb_perror_msg() have been added that only take a single
parameter and so could have been using bb_simple_perror_message().
This changeset introduces 'simple' versions of bb_info_msg(),
bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and
bb_herror_msg_and_die(), and replaces all calls that only take a
single parameter, or use something like ("%s", arg), with calls to the
corresponding 'simple' version.
Since it is likely that single parameter calls to the variadic functions
may be accidentally reintroduced in the future a new debugging config
option WARN_SIMPLE_MSG has been introduced. This uses some macro magic
which will cause any such calls to generate a warning, but this is
turned off by default to avoid use of the unpleasant macros in normal
circumstances.
This is a large changeset due to the number of calls that have been
replaced. The only files that contain changes other than simple
substitution of function calls are libbb.h, libbb/herror_msg.c,
libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c,
networking/udhcp/common.h and util-linux/mdev.c additonal macros have
been added for logging so that single parameter and multiple parameter
logging variants exist.
The amount of space saved varies considerably by architecture, and was
found to be as follows (for 'defconfig' using GCC 7.4):
Arm: -92 bytes
MIPS: -52 bytes
PPC: -1836 bytes
x86_64: -938 bytes
Note that for the MIPS architecture only an exception had to be made
disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h)
because it made these files larger on MIPS.
Signed-off-by: James Byrne <james.byrne@origamienergy.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Check user and group names for illegal characters
|
|
*
|
|
* Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
#include "libbb.h"
|
|
|
|
/* To avoid problems, the username should consist only of
|
|
* letters, digits, underscores, periods, at signs and dashes,
|
|
* and not start with a dash (as defined by IEEE Std 1003.1-2001).
|
|
* For compatibility with Samba machine accounts $ is also supported
|
|
* at the end of the username.
|
|
*/
|
|
|
|
void FAST_FUNC die_if_bad_username(const char *name)
|
|
{
|
|
const char *start = name;
|
|
|
|
/* 1st char being dash or dot isn't valid:
|
|
* for example, name like ".." can make adduser
|
|
* chown "/home/.." recursively - NOT GOOD.
|
|
* Name of just a single "$" is also rejected.
|
|
*/
|
|
goto skip;
|
|
|
|
do {
|
|
unsigned char ch;
|
|
|
|
/* These chars are valid unless they are at the 1st pos: */
|
|
if (*name == '-'
|
|
|| *name == '.'
|
|
/* $ is allowed if it's the last char: */
|
|
|| (*name == '$' && !name[1])
|
|
) {
|
|
continue;
|
|
}
|
|
skip:
|
|
ch = *name;
|
|
if (ch == '_'
|
|
/* || ch == '@' -- we disallow this too. Think about "user@host" */
|
|
/* open-coded isalnum: */
|
|
|| (ch >= '0' && ch <= '9')
|
|
|| ((ch|0x20) >= 'a' && (ch|0x20) <= 'z')
|
|
) {
|
|
continue;
|
|
}
|
|
bb_error_msg_and_die("illegal character with code %u at position %u",
|
|
(unsigned)ch, (unsigned)(name - start));
|
|
} while (*++name);
|
|
|
|
/* The minimum size of the login name is one char or two if
|
|
* last char is the '$'. Violations of this are caught above.
|
|
* The maximum size of the login name is LOGIN_NAME_MAX
|
|
* including the terminating null byte.
|
|
*/
|
|
if (name - start >= LOGIN_NAME_MAX)
|
|
bb_simple_error_msg_and_die("name is too long");
|
|
}
|