mirror of
https://github.com/sheumann/hush.git
synced 2024-08-15 02:29:00 +00:00
The array applet_nameofs consumes two bytes per applet. It encodes nofork/noexec flags suid flags the offset of the applet name in the applet_name string Change the applet_table build tool to store the flags in two separate arrays (applet_flags and applet_suid). Replace applet_nameofs[] with a smaller version that only stores a limited number of offsets. This requires changes to the macros APPLET_IS_NOFORK, APPLET_IS_NOEXEC and APPLET_SUID. According to Valgrind the original find_applet_by_name required 353 cycles per call, averaged over all names. Adjusting the number of known offsets allows space to be traded off against execution time: KNOWN_OFFSETS cycles bytes (wrt KNOWN_OFFSETS = 0) 0 9057 - 2 4604 32 4 2407 75 8 1342 98 16 908 130 32 884 194 This patch uses KNOWN_OFFSETS = 8. v2: Remove some dead code from the applet_table tool; Treat the applet in the middle of the table as a special case. v3: Use the middle applet to adjust the start of the linear search as well as the last applet found. v4: Use an augmented linear search in find_applet_by_name. Drop the special treatment of the middle name from get_applet_name: most of the advantage now derives from the last stored value. v5: Don't store index in applet_nameofs, it can be calculated. v6: Tweaks by Denys function old new delta find_applet_by_name 25 125 +100 applet_suid - 92 +92 run_applet_no_and_exit 452 460 +8 run_applet_and_exit 695 697 +2 applet_name_compare 31 - -31 applet_nameofs 734 14 -720 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 3/1 up/down: 202/-751) Total: -549 bytes text data bss dec hex filename 925464 906 17160 943530 e65aa busybox_old 924915 906 17160 942981 e6385 busybox_unstripped Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
882 lines
23 KiB
C
882 lines
23 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) tons of folks. Tracking down who wrote what
|
|
* isn't something I'm going to worry about... If you wrote something
|
|
* here, please feel free to acknowledge your work.
|
|
*
|
|
* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
|
|
* Permission has been granted to redistribute this code under GPL.
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
/* We are trying to not use printf, this benefits the case when selected
|
|
* applets are really simple. Example:
|
|
*
|
|
* $ ./busybox
|
|
* ...
|
|
* Currently defined functions:
|
|
* basename, false, true
|
|
*
|
|
* $ size busybox
|
|
* text data bss dec hex filename
|
|
* 4473 52 72 4597 11f5 busybox
|
|
*
|
|
* FEATURE_INSTALLER or FEATURE_SUID will still link printf routines in. :(
|
|
*/
|
|
#include "busybox.h"
|
|
|
|
#if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
|
|
|| defined(__APPLE__) \
|
|
)
|
|
# include <malloc.h> /* for mallopt */
|
|
#endif
|
|
|
|
|
|
/* Declare <applet>_main() */
|
|
#define PROTOTYPES
|
|
#include "applets.h"
|
|
#undef PROTOTYPES
|
|
|
|
/* Include generated applet names, pointers to <applet>_main, etc */
|
|
#include "applet_tables.h"
|
|
/* ...and if applet_tables generator says we have only one applet... */
|
|
#ifdef SINGLE_APPLET_MAIN
|
|
# undef ENABLE_FEATURE_INDIVIDUAL
|
|
# define ENABLE_FEATURE_INDIVIDUAL 1
|
|
# undef IF_FEATURE_INDIVIDUAL
|
|
# define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__
|
|
#endif
|
|
|
|
#include "usage_compressed.h"
|
|
|
|
|
|
#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
|
|
static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
|
|
#else
|
|
# define usage_messages 0
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_COMPRESS_USAGE
|
|
|
|
static const char packed_usage[] ALIGN1 = { PACKED_USAGE };
|
|
# include "bb_archive.h"
|
|
static const char *unpack_usage_messages(void)
|
|
{
|
|
char *outbuf = NULL;
|
|
bunzip_data *bd;
|
|
int i;
|
|
|
|
i = start_bunzip(&bd,
|
|
/* src_fd: */ -1,
|
|
/* inbuf: */ packed_usage,
|
|
/* len: */ sizeof(packed_usage));
|
|
/* read_bunzip can longjmp to start_bunzip, and ultimately
|
|
* end up here with i != 0 on read data errors! Not trivial */
|
|
if (!i) {
|
|
/* Cannot use xmalloc: will leak bd in NOFORK case! */
|
|
outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE));
|
|
if (outbuf)
|
|
read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE));
|
|
}
|
|
dealloc_bunzip(bd);
|
|
return outbuf;
|
|
}
|
|
# define dealloc_usage_messages(s) free(s)
|
|
|
|
#else
|
|
|
|
# define unpack_usage_messages() usage_messages
|
|
# define dealloc_usage_messages(s) ((void)(s))
|
|
|
|
#endif /* FEATURE_COMPRESS_USAGE */
|
|
|
|
|
|
void FAST_FUNC bb_show_usage(void)
|
|
{
|
|
if (ENABLE_SHOW_USAGE) {
|
|
#ifdef SINGLE_APPLET_STR
|
|
/* Imagine that this applet is "true". Dont suck in printf! */
|
|
const char *usage_string = unpack_usage_messages();
|
|
|
|
if (*usage_string == '\b') {
|
|
full_write2_str("No help available.\n\n");
|
|
} else {
|
|
full_write2_str("Usage: "SINGLE_APPLET_STR" ");
|
|
full_write2_str(usage_string);
|
|
full_write2_str("\n\n");
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
dealloc_usage_messages((char*)usage_string);
|
|
#else
|
|
const char *p;
|
|
const char *usage_string = p = unpack_usage_messages();
|
|
int ap = find_applet_by_name(applet_name);
|
|
|
|
if (ap < 0) /* never happens, paranoia */
|
|
xfunc_die();
|
|
while (ap) {
|
|
while (*p++) continue;
|
|
ap--;
|
|
}
|
|
full_write2_str(bb_banner);
|
|
full_write2_str(" multi-call binary.\n");
|
|
if (*p == '\b')
|
|
full_write2_str("\nNo help available.\n\n");
|
|
else {
|
|
full_write2_str("\nUsage: ");
|
|
full_write2_str(applet_name);
|
|
full_write2_str(" ");
|
|
full_write2_str(p);
|
|
full_write2_str("\n");
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
dealloc_usage_messages((char*)usage_string);
|
|
#endif
|
|
}
|
|
xfunc_die();
|
|
}
|
|
|
|
int FAST_FUNC find_applet_by_name(const char *name)
|
|
{
|
|
unsigned i, max;
|
|
int j;
|
|
const char *p;
|
|
|
|
p = applet_names;
|
|
i = 0;
|
|
#if KNOWN_APPNAME_OFFSETS <= 0
|
|
max = NUM_APPLETS;
|
|
#else
|
|
max = NUM_APPLETS * KNOWN_APPNAME_OFFSETS;
|
|
for (j = ARRAY_SIZE(applet_nameofs)-1; j >= 0; j--) {
|
|
const char *pp = applet_names + applet_nameofs[j];
|
|
if (strcmp(name, pp) >= 0) {
|
|
//bb_error_msg("name:'%s' >= pp:'%s'", name, pp);
|
|
p = pp;
|
|
i = max - NUM_APPLETS;
|
|
break;
|
|
}
|
|
max -= NUM_APPLETS;
|
|
}
|
|
max /= (unsigned)KNOWN_APPNAME_OFFSETS;
|
|
i /= (unsigned)KNOWN_APPNAME_OFFSETS;
|
|
//bb_error_msg("name:'%s' starting from:'%s' i:%u max:%u", name, p, i, max);
|
|
#endif
|
|
|
|
/* Open-coding without strcmp/strlen calls for speed */
|
|
while (i < max) {
|
|
char ch;
|
|
j = 0;
|
|
/* Do we see "name\0" in applet_names[p] position? */
|
|
while ((ch = *p) == name[j]) {
|
|
if (ch == '\0') {
|
|
//bb_error_msg("found:'%s' i:%u", name, i);
|
|
return i; /* yes */
|
|
}
|
|
p++;
|
|
j++;
|
|
}
|
|
/* No.
|
|
* p => 1st non-matching char in applet_names[],
|
|
* skip to and including NUL.
|
|
*/
|
|
while (ch != '\0')
|
|
ch = *++p;
|
|
p++;
|
|
i++;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
void lbb_prepare(const char *applet
|
|
IF_FEATURE_INDIVIDUAL(, char **argv))
|
|
MAIN_EXTERNALLY_VISIBLE;
|
|
void lbb_prepare(const char *applet
|
|
IF_FEATURE_INDIVIDUAL(, char **argv))
|
|
{
|
|
#ifdef __GLIBC__
|
|
(*(int **)&bb_errno) = __errno_location();
|
|
barrier();
|
|
#endif
|
|
applet_name = applet;
|
|
|
|
if (ENABLE_LOCALE_SUPPORT)
|
|
setlocale(LC_ALL, "");
|
|
|
|
#if ENABLE_FEATURE_INDIVIDUAL
|
|
/* Redundant for busybox (run_applet_and_exit covers that case)
|
|
* but needed for "individual applet" mode */
|
|
if (argv[1]
|
|
&& !argv[2]
|
|
&& strcmp(argv[1], "--help") == 0
|
|
&& !is_prefixed_with(applet, "busybox")
|
|
) {
|
|
/* Special case. POSIX says "test --help"
|
|
* should be no different from e.g. "test --foo". */
|
|
if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
|
|
bb_show_usage();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* The code below can well be in applets/applets.c, as it is used only
|
|
* for busybox binary, not "individual" binaries.
|
|
* However, keeping it here and linking it into libbusybox.so
|
|
* (together with remaining tiny applets/applets.o)
|
|
* makes it possible to avoid --whole-archive at link time.
|
|
* This makes (shared busybox) + libbusybox smaller.
|
|
* (--gc-sections would be even better....)
|
|
*/
|
|
|
|
const char *applet_name;
|
|
#if !BB_MMU
|
|
bool re_execed;
|
|
#endif
|
|
|
|
|
|
/* If not built as a single-applet executable... */
|
|
#if !defined(SINGLE_APPLET_MAIN)
|
|
|
|
IF_FEATURE_SUID(static uid_t ruid;) /* real uid */
|
|
|
|
# if ENABLE_FEATURE_SUID_CONFIG
|
|
|
|
static struct suid_config_t {
|
|
/* next ptr must be first: this struct needs to be llist-compatible */
|
|
struct suid_config_t *m_next;
|
|
struct bb_uidgid_t m_ugid;
|
|
int m_applet;
|
|
mode_t m_mode;
|
|
} *suid_config;
|
|
|
|
static bool suid_cfg_readable;
|
|
|
|
/* check if u is member of group g */
|
|
static int ingroup(uid_t u, gid_t g)
|
|
{
|
|
struct group *grp = getgrgid(g);
|
|
if (grp) {
|
|
char **mem;
|
|
for (mem = grp->gr_mem; *mem; mem++) {
|
|
struct passwd *pwd = getpwnam(*mem);
|
|
if (pwd && (pwd->pw_uid == u))
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* libbb candidate */
|
|
static char *get_trimmed_slice(char *s, char *e)
|
|
{
|
|
/* First, consider the value at e to be nul and back up until we
|
|
* reach a non-space char. Set the char after that (possibly at
|
|
* the original e) to nul. */
|
|
while (e-- > s) {
|
|
if (!isspace(*e)) {
|
|
break;
|
|
}
|
|
}
|
|
e[1] = '\0';
|
|
|
|
/* Next, advance past all leading space and return a ptr to the
|
|
* first non-space char; possibly the terminating nul. */
|
|
return skip_whitespace(s);
|
|
}
|
|
|
|
static void parse_config_file(void)
|
|
{
|
|
/* Don't depend on the tools to combine strings. */
|
|
static const char config_file[] ALIGN1 = "/etc/busybox.conf";
|
|
|
|
struct suid_config_t *sct_head;
|
|
int applet_no;
|
|
FILE *f;
|
|
const char *errmsg;
|
|
unsigned lc;
|
|
smallint section;
|
|
struct stat st;
|
|
|
|
ruid = getuid();
|
|
if (ruid == 0) /* run by root - don't need to even read config file */
|
|
return;
|
|
|
|
if ((stat(config_file, &st) != 0) /* No config file? */
|
|
|| !S_ISREG(st.st_mode) /* Not a regular file? */
|
|
|| (st.st_uid != 0) /* Not owned by root? */
|
|
|| (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
|
|
|| !(f = fopen_for_read(config_file)) /* Cannot open? */
|
|
) {
|
|
return;
|
|
}
|
|
|
|
suid_cfg_readable = 1;
|
|
sct_head = NULL;
|
|
section = lc = 0;
|
|
|
|
while (1) {
|
|
char buffer[256];
|
|
char *s;
|
|
|
|
if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */
|
|
// Looks like bloat
|
|
//if (ferror(f)) { /* Make sure it wasn't a read error. */
|
|
// errmsg = "reading";
|
|
// goto pe_label;
|
|
//}
|
|
fclose(f);
|
|
suid_config = sct_head; /* Success, so set the pointer. */
|
|
return;
|
|
}
|
|
|
|
s = buffer;
|
|
lc++; /* Got a (partial) line. */
|
|
|
|
/* If a line is too long for our buffer, we consider it an error.
|
|
* The following test does mistreat one corner case though.
|
|
* If the final line of the file does not end with a newline and
|
|
* yet exactly fills the buffer, it will be treated as too long
|
|
* even though there isn't really a problem. But it isn't really
|
|
* worth adding code to deal with such an unlikely situation, and
|
|
* we do err on the side of caution. Besides, the line would be
|
|
* too long if it did end with a newline. */
|
|
if (!strchr(s, '\n') && !feof(f)) {
|
|
errmsg = "line too long";
|
|
goto pe_label;
|
|
}
|
|
|
|
/* Trim leading and trailing whitespace, ignoring comments, and
|
|
* check if the resulting string is empty. */
|
|
s = get_trimmed_slice(s, strchrnul(s, '#'));
|
|
if (!*s) {
|
|
continue;
|
|
}
|
|
|
|
/* Check for a section header. */
|
|
|
|
if (*s == '[') {
|
|
/* Unlike the old code, we ignore leading and trailing
|
|
* whitespace for the section name. We also require that
|
|
* there are no stray characters after the closing bracket. */
|
|
char *e = strchr(s, ']');
|
|
if (!e /* Missing right bracket? */
|
|
|| e[1] /* Trailing characters? */
|
|
|| !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
|
|
) {
|
|
errmsg = "section header";
|
|
goto pe_label;
|
|
}
|
|
/* Right now we only have one section so just check it.
|
|
* If more sections are added in the future, please don't
|
|
* resort to cascading ifs with multiple strcasecmp calls.
|
|
* That kind of bloated code is all too common. A loop
|
|
* and a string table would be a better choice unless the
|
|
* number of sections is very small. */
|
|
if (strcasecmp(s, "SUID") == 0) {
|
|
section = 1;
|
|
continue;
|
|
}
|
|
section = -1; /* Unknown section so set to skip. */
|
|
continue;
|
|
}
|
|
|
|
/* Process sections. */
|
|
|
|
if (section == 1) { /* SUID */
|
|
/* Since we trimmed leading and trailing space above, we're
|
|
* now looking for strings of the form
|
|
* <key>[::space::]*=[::space::]*<value>
|
|
* where both key and value could contain inner whitespace. */
|
|
|
|
/* First get the key (an applet name in our case). */
|
|
char *e = strchr(s, '=');
|
|
if (e) {
|
|
s = get_trimmed_slice(s, e);
|
|
}
|
|
if (!e || !*s) { /* Missing '=' or empty key. */
|
|
errmsg = "keyword";
|
|
goto pe_label;
|
|
}
|
|
|
|
/* Ok, we have an applet name. Process the rhs if this
|
|
* applet is currently built in and ignore it otherwise.
|
|
* Note: this can hide config file bugs which only pop
|
|
* up when the busybox configuration is changed. */
|
|
applet_no = find_applet_by_name(s);
|
|
if (applet_no >= 0) {
|
|
unsigned i;
|
|
struct suid_config_t *sct;
|
|
|
|
/* Note: We currently don't check for duplicates!
|
|
* The last config line for each applet will be the
|
|
* one used since we insert at the head of the list.
|
|
* I suppose this could be considered a feature. */
|
|
sct = xzalloc(sizeof(*sct));
|
|
sct->m_applet = applet_no;
|
|
/*sct->m_mode = 0;*/
|
|
sct->m_next = sct_head;
|
|
sct_head = sct;
|
|
|
|
/* Get the specified mode. */
|
|
|
|
e = skip_whitespace(e+1);
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
/* There are 4 chars for each of user/group/other.
|
|
* "x-xx" instead of "x-" are to make
|
|
* "idx > 3" check catch invalid chars.
|
|
*/
|
|
static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx";
|
|
static const unsigned short mode_mask[] ALIGN2 = {
|
|
S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */
|
|
S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */
|
|
S_IXOTH, 0 /* x- */
|
|
};
|
|
const char *q = strchrnul(mode_chars + 4*i, *e);
|
|
unsigned idx = q - (mode_chars + 4*i);
|
|
if (idx > 3) {
|
|
errmsg = "mode";
|
|
goto pe_label;
|
|
}
|
|
sct->m_mode |= mode_mask[q - mode_chars];
|
|
e++;
|
|
}
|
|
|
|
/* Now get the user/group info. */
|
|
|
|
s = skip_whitespace(e);
|
|
/* Default is 0.0, else parse USER.GROUP: */
|
|
if (*s) {
|
|
/* We require whitespace between mode and USER.GROUP */
|
|
if ((s == e) || !(e = strchr(s, '.'))) {
|
|
errmsg = "uid.gid";
|
|
goto pe_label;
|
|
}
|
|
*e = ':'; /* get_uidgid needs USER:GROUP syntax */
|
|
if (get_uidgid(&sct->m_ugid, s) == 0) {
|
|
errmsg = "unknown user/group";
|
|
goto pe_label;
|
|
}
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* Unknown sections are ignored. */
|
|
|
|
/* Encountering configuration lines prior to seeing a
|
|
* section header is treated as an error. This is how
|
|
* the old code worked, but it may not be desirable.
|
|
* We may want to simply ignore such lines in case they
|
|
* are used in some future version of busybox. */
|
|
if (!section) {
|
|
errmsg = "keyword outside section";
|
|
goto pe_label;
|
|
}
|
|
} /* while (1) */
|
|
|
|
pe_label:
|
|
fclose(f);
|
|
bb_error_msg("parse error in %s, line %u: %s", config_file, lc, errmsg);
|
|
|
|
/* Release any allocated memory before returning. */
|
|
llist_free((llist_t*)sct_head, NULL);
|
|
}
|
|
# else
|
|
static inline void parse_config_file(void)
|
|
{
|
|
IF_FEATURE_SUID(ruid = getuid();)
|
|
}
|
|
# endif /* FEATURE_SUID_CONFIG */
|
|
|
|
|
|
# if ENABLE_FEATURE_SUID
|
|
static void check_suid(int applet_no)
|
|
{
|
|
gid_t rgid; /* real gid */
|
|
|
|
if (ruid == 0) /* set by parse_config_file() */
|
|
return; /* run by root - no need to check more */
|
|
rgid = getgid();
|
|
|
|
# if ENABLE_FEATURE_SUID_CONFIG
|
|
if (suid_cfg_readable) {
|
|
uid_t uid;
|
|
struct suid_config_t *sct;
|
|
mode_t m;
|
|
|
|
for (sct = suid_config; sct; sct = sct->m_next) {
|
|
if (sct->m_applet == applet_no)
|
|
goto found;
|
|
}
|
|
goto check_need_suid;
|
|
found:
|
|
/* Is this user allowed to run this applet? */
|
|
m = sct->m_mode;
|
|
if (sct->m_ugid.uid == ruid)
|
|
/* same uid */
|
|
m >>= 6;
|
|
else if ((sct->m_ugid.gid == rgid) || ingroup(ruid, sct->m_ugid.gid))
|
|
/* same group / in group */
|
|
m >>= 3;
|
|
if (!(m & S_IXOTH)) /* is x bit not set? */
|
|
bb_error_msg_and_die("you have no permission to run this applet");
|
|
|
|
/* We set effective AND saved ids. If saved-id is not set
|
|
* like we do below, seteuid(0) can still later succeed! */
|
|
|
|
/* Are we directed to change gid
|
|
* (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)?
|
|
*/
|
|
if (sct->m_mode & S_ISGID)
|
|
rgid = sct->m_ugid.gid;
|
|
/* else: we will set egid = rgid, thus dropping sgid effect */
|
|
if (setresgid(-1, rgid, rgid))
|
|
bb_perror_msg_and_die("setresgid");
|
|
|
|
/* Are we directed to change uid
|
|
* (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)?
|
|
*/
|
|
uid = ruid;
|
|
if (sct->m_mode & S_ISUID)
|
|
uid = sct->m_ugid.uid;
|
|
/* else: we will set euid = ruid, thus dropping suid effect */
|
|
if (setresuid(-1, uid, uid))
|
|
bb_perror_msg_and_die("setresuid");
|
|
|
|
goto ret;
|
|
}
|
|
# if !ENABLE_FEATURE_SUID_CONFIG_QUIET
|
|
{
|
|
static bool onetime = 0;
|
|
|
|
if (!onetime) {
|
|
onetime = 1;
|
|
bb_error_msg("using fallback suid method");
|
|
}
|
|
}
|
|
# endif
|
|
check_need_suid:
|
|
# endif
|
|
if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) {
|
|
/* Real uid is not 0. If euid isn't 0 too, suid bit
|
|
* is most probably not set on our executable */
|
|
if (geteuid())
|
|
bb_error_msg_and_die("must be suid to work properly");
|
|
} else if (APPLET_SUID(applet_no) == BB_SUID_DROP) {
|
|
xsetgid(rgid); /* drop all privileges */
|
|
xsetuid(ruid);
|
|
}
|
|
# if ENABLE_FEATURE_SUID_CONFIG
|
|
ret: ;
|
|
llist_free((llist_t*)suid_config, NULL);
|
|
# endif
|
|
}
|
|
# else
|
|
# define check_suid(x) ((void)0)
|
|
# endif /* FEATURE_SUID */
|
|
|
|
|
|
# if ENABLE_FEATURE_INSTALLER
|
|
static const char usr_bin [] ALIGN1 = "/usr/bin/";
|
|
static const char usr_sbin[] ALIGN1 = "/usr/sbin/";
|
|
static const char *const install_dir[] = {
|
|
&usr_bin [8], /* "/" */
|
|
&usr_bin [4], /* "/bin/" */
|
|
&usr_sbin[4] /* "/sbin/" */
|
|
# if !ENABLE_INSTALL_NO_USR
|
|
,usr_bin
|
|
,usr_sbin
|
|
# endif
|
|
};
|
|
|
|
/* create (sym)links for each applet */
|
|
static void install_links(const char *busybox, int use_symbolic_links,
|
|
char *custom_install_dir)
|
|
{
|
|
/* directory table
|
|
* this should be consistent w/ the enum,
|
|
* busybox.h::bb_install_loc_t, or else... */
|
|
int (*lf)(const char *, const char *);
|
|
char *fpc;
|
|
const char *appname = applet_names;
|
|
unsigned i;
|
|
int rc;
|
|
|
|
lf = link;
|
|
if (use_symbolic_links)
|
|
lf = symlink;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
|
|
fpc = concat_path_file(
|
|
custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)],
|
|
appname);
|
|
// debug: bb_error_msg("%slinking %s to busybox",
|
|
// use_symbolic_links ? "sym" : "", fpc);
|
|
rc = lf(busybox, fpc);
|
|
if (rc != 0 && errno != EEXIST) {
|
|
bb_simple_perror_msg(fpc);
|
|
}
|
|
free(fpc);
|
|
while (*appname++ != '\0')
|
|
continue;
|
|
}
|
|
}
|
|
# else
|
|
static void install_links(const char *busybox UNUSED_PARAM,
|
|
int use_symbolic_links UNUSED_PARAM,
|
|
char *custom_install_dir UNUSED_PARAM)
|
|
{
|
|
}
|
|
# endif
|
|
|
|
/* If we were called as "busybox..." */
|
|
static int busybox_main(char **argv)
|
|
{
|
|
if (!argv[1]) {
|
|
/* Called without arguments */
|
|
const char *a;
|
|
int col;
|
|
unsigned output_width;
|
|
help:
|
|
output_width = 80;
|
|
if (ENABLE_FEATURE_AUTOWIDTH) {
|
|
/* Obtain the terminal width */
|
|
output_width = get_terminal_width(2);
|
|
}
|
|
|
|
dup2(1, 2);
|
|
full_write2_str(bb_banner); /* reuse const string */
|
|
full_write2_str(" multi-call binary.\n"); /* reuse */
|
|
full_write2_str(
|
|
"BusyBox is copyrighted by many authors between 1998-2015.\n"
|
|
"Licensed under GPLv2. See source distribution for detailed\n"
|
|
"copyright notices.\n"
|
|
"\n"
|
|
"Usage: busybox [function [arguments]...]\n"
|
|
" or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n"
|
|
IF_FEATURE_INSTALLER(
|
|
" or: busybox --install [-s] [DIR]\n"
|
|
)
|
|
" or: function [arguments]...\n"
|
|
"\n"
|
|
IF_NOT_FEATURE_SH_STANDALONE(
|
|
"\tBusyBox is a multi-call binary that combines many common Unix\n"
|
|
"\tutilities into a single executable. Most people will create a\n"
|
|
"\tlink to busybox for each function they wish to use and BusyBox\n"
|
|
"\twill act like whatever it was invoked as.\n"
|
|
)
|
|
IF_FEATURE_SH_STANDALONE(
|
|
"\tBusyBox is a multi-call binary that combines many common Unix\n"
|
|
"\tutilities into a single executable. The shell in this build\n"
|
|
"\tis configured to run built-in utilities without $PATH search.\n"
|
|
"\tYou don't need to install a link to busybox for each utility.\n"
|
|
"\tTo run external program, use full path (/sbin/ip instead of ip).\n"
|
|
)
|
|
"\n"
|
|
"Currently defined functions:\n"
|
|
);
|
|
col = 0;
|
|
a = applet_names;
|
|
/* prevent last comma to be in the very last pos */
|
|
output_width--;
|
|
while (*a) {
|
|
int len2 = strlen(a) + 2;
|
|
if (col >= (int)output_width - len2) {
|
|
full_write2_str(",\n");
|
|
col = 0;
|
|
}
|
|
if (col == 0) {
|
|
col = 6;
|
|
full_write2_str("\t");
|
|
} else {
|
|
full_write2_str(", ");
|
|
}
|
|
full_write2_str(a);
|
|
col += len2;
|
|
a += len2 - 1;
|
|
}
|
|
full_write2_str("\n\n");
|
|
return 0;
|
|
}
|
|
|
|
if (is_prefixed_with(argv[1], "--list")) {
|
|
unsigned i = 0;
|
|
const char *a = applet_names;
|
|
dup2(1, 2);
|
|
while (*a) {
|
|
# if ENABLE_FEATURE_INSTALLER
|
|
if (argv[1][6]) /* --list-full? */
|
|
full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
|
|
# endif
|
|
full_write2_str(a);
|
|
full_write2_str("\n");
|
|
i++;
|
|
a += strlen(a) + 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
|
|
int use_symbolic_links;
|
|
const char *busybox;
|
|
|
|
busybox = xmalloc_readlink(bb_busybox_exec_path);
|
|
if (!busybox) {
|
|
/* bb_busybox_exec_path is usually "/proc/self/exe".
|
|
* In chroot, readlink("/proc/self/exe") usually fails.
|
|
* In such case, better use argv[0] as symlink target
|
|
* if it is a full path name.
|
|
*/
|
|
if (argv[0][0] != '/')
|
|
bb_error_msg_and_die("'%s' is not an absolute path", argv[0]);
|
|
busybox = argv[0];
|
|
}
|
|
/* busybox --install [-s] [DIR]:
|
|
* -s: make symlinks
|
|
* DIR: directory to install links to
|
|
*/
|
|
use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv);
|
|
install_links(busybox, use_symbolic_links, argv[2]);
|
|
return 0;
|
|
}
|
|
|
|
if (strcmp(argv[1], "--help") == 0) {
|
|
/* "busybox --help [<applet>]" */
|
|
if (!argv[2])
|
|
goto help;
|
|
/* convert to "<applet> --help" */
|
|
argv[0] = argv[2];
|
|
argv[2] = NULL;
|
|
} else {
|
|
/* "busybox <applet> arg1 arg2 ..." */
|
|
argv++;
|
|
}
|
|
/* We support "busybox /a/path/to/applet args..." too. Allows for
|
|
* "#!/bin/busybox"-style wrappers */
|
|
applet_name = bb_get_last_path_component_nostrip(argv[0]);
|
|
run_applet_and_exit(applet_name, argv);
|
|
|
|
/*bb_error_msg_and_die("applet not found"); - sucks in printf */
|
|
full_write2_str(applet_name);
|
|
full_write2_str(": applet not found\n");
|
|
/* POSIX: "If a command is not found, the exit status shall be 127" */
|
|
exit(127);
|
|
}
|
|
|
|
void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
|
|
{
|
|
int argc = 1;
|
|
|
|
while (argv[argc])
|
|
argc++;
|
|
|
|
/* Reinit some shared global data */
|
|
xfunc_error_retval = EXIT_FAILURE;
|
|
applet_name = bb_get_last_path_component_nostrip(argv[0]);
|
|
|
|
/* Special case. POSIX says "test --help"
|
|
* should be no different from e.g. "test --foo".
|
|
* Thus for "test", we skip --help check.
|
|
* "true" and "false" are also special.
|
|
*/
|
|
if (1
|
|
#if defined APPLET_NO_test
|
|
&& applet_no != APPLET_NO_test
|
|
#endif
|
|
#if defined APPLET_NO_true
|
|
&& applet_no != APPLET_NO_true
|
|
#endif
|
|
#if defined APPLET_NO_false
|
|
&& applet_no != APPLET_NO_false
|
|
#endif
|
|
) {
|
|
if (argc == 2 && strcmp(argv[1], "--help") == 0) {
|
|
/* Make "foo --help" exit with 0: */
|
|
xfunc_error_retval = 0;
|
|
bb_show_usage();
|
|
}
|
|
}
|
|
if (ENABLE_FEATURE_SUID)
|
|
check_suid(applet_no);
|
|
exit(applet_main[applet_no](argc, argv));
|
|
}
|
|
|
|
void FAST_FUNC run_applet_and_exit(const char *name, char **argv)
|
|
{
|
|
int applet;
|
|
|
|
if (is_prefixed_with(name, "busybox"))
|
|
exit(busybox_main(argv));
|
|
/* find_applet_by_name() search is more expensive, so goes second */
|
|
applet = find_applet_by_name(name);
|
|
if (applet >= 0)
|
|
run_applet_no_and_exit(applet, argv);
|
|
}
|
|
|
|
#endif /* !defined(SINGLE_APPLET_MAIN) */
|
|
|
|
|
|
|
|
#if ENABLE_BUILD_LIBBUSYBOX
|
|
int lbb_main(char **argv)
|
|
#else
|
|
int main(int argc UNUSED_PARAM, char **argv)
|
|
#endif
|
|
{
|
|
/* Tweak malloc for reduced memory consumption */
|
|
#ifdef M_TRIM_THRESHOLD
|
|
/* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory
|
|
* to keep before releasing to the OS
|
|
* Default is way too big: 256k
|
|
*/
|
|
mallopt(M_TRIM_THRESHOLD, 8 * 1024);
|
|
#endif
|
|
#ifdef M_MMAP_THRESHOLD
|
|
/* M_MMAP_THRESHOLD is the request size threshold for using mmap()
|
|
* Default is too big: 256k
|
|
*/
|
|
mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256);
|
|
#endif
|
|
|
|
#if !BB_MMU
|
|
/* NOMMU re-exec trick sets high-order bit in first byte of name */
|
|
if (argv[0][0] & 0x80) {
|
|
re_execed = 1;
|
|
argv[0][0] &= 0x7f;
|
|
}
|
|
#endif
|
|
|
|
#if defined(SINGLE_APPLET_MAIN)
|
|
/* Only one applet is selected in .config */
|
|
if (argv[1] && is_prefixed_with(argv[0], "busybox")) {
|
|
/* "busybox <applet> <params>" should still work as expected */
|
|
argv++;
|
|
}
|
|
/* applet_names in this case is just "applet\0\0" */
|
|
lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
|
|
return SINGLE_APPLET_MAIN(argc, argv);
|
|
#else
|
|
lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
|
|
|
|
applet_name = argv[0];
|
|
if (applet_name[0] == '-')
|
|
applet_name++;
|
|
applet_name = bb_basename(applet_name);
|
|
|
|
parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
|
|
|
|
run_applet_and_exit(applet_name, argv);
|
|
|
|
/*bb_error_msg_and_die("applet not found"); - sucks in printf */
|
|
full_write2_str(applet_name);
|
|
full_write2_str(": applet not found\n");
|
|
/* POSIX: "If a command is not found, the exit status shall be 127" */
|
|
exit(127);
|
|
#endif
|
|
}
|