*
* 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:
*
# include <malloc.h> /* for mallopt */
#endif
-
/* Declare <applet>_main() */
#define PROTOTYPES
#include "applets.h"
#include "usage_compressed.h"
+#if ENABLE_FEATURE_SH_EMBEDDED_SCRIPTS
+# define DEFINE_SCRIPT_DATA 1
+# include "embedded_scripts.h"
+#else
+# define NUM_SCRIPTS 0
+#endif
+#if NUM_SCRIPTS > 0
+# include "bb_archive.h"
+static const char packed_scripts[] ALIGN1 = { PACKED_SCRIPTS };
+#endif
+
+/* "Do not compress usage text if uncompressed text is small
+ * and we don't include bunzip2 code for other reasons"
+ *
+ * Useful for mass one-applet rebuild (bunzip2 code is ~2.7k).
+ *
+ * Unlike BUNZIP2, if FEATURE_SEAMLESS_BZ2 is on, bunzip2 code is built but
+ * still may be unused if none of the selected applets calls open_zipped()
+ * or its friends; we test for (FEATURE_SEAMLESS_BZ2 && <APPLET>) instead.
+ * For example, only if TAR and FEATURE_SEAMLESS_BZ2 are both selected,
+ * then bunzip2 code will be linked in anyway, and disabling help compression
+ * would be not optimal:
+ */
+#if UNPACKED_USAGE_LENGTH < 4*1024 \
+ && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_TAR) \
+ && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MODPROBE) \
+ && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_INSMOD) \
+ && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_DEPMOD) \
+ && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MAN) \
+ && !ENABLE_BUNZIP2 \
+ && !ENABLE_BZCAT
+# undef ENABLE_FEATURE_COMPRESS_USAGE
+# define ENABLE_FEATURE_COMPRESS_USAGE 0
+#endif
+
+
+unsigned FAST_FUNC string_array_len(char **argv)
+{
+ char **start = argv;
+
+ while (*argv)
+ argv++;
+
+ return argv - start;
+}
+
+
#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
#else
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 unpack_usage_messages() \
+ unpack_bz2_data(packed_usage, sizeof(packed_usage), sizeof(UNPACKED_USAGE))
# define dealloc_usage_messages(s) free(s)
#else
{
if (ENABLE_SHOW_USAGE) {
#ifdef SINGLE_APPLET_STR
- /* Imagine that this applet is "true". Dont suck in printf! */
+ /* Imagine that this applet is "true". Dont link 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 (usage_string) {
+ if (*usage_string == '\b') {
+ full_write2_str("No help available\n");
+ } else {
+ full_write2_str("Usage: "SINGLE_APPLET_STR" ");
+ full_write2_str(usage_string);
+ full_write2_str("\n");
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ dealloc_usage_messages((char*)usage_string);
}
- 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 */
+ if (ap < 0 || usage_string == NULL)
xfunc_die();
while (ap) {
while (*p++) continue;
ap--;
}
full_write2_str(bb_banner);
- full_write2_str(" multi-call binary.\n");
+ full_write2_str(" multi-call binary.\n"); /* common string */
if (*p == '\b')
- full_write2_str("\nNo help available.\n\n");
+ full_write2_str("\nNo help available\n");
else {
full_write2_str("\nUsage: ");
full_write2_str(applet_name);
- full_write2_str(" ");
- full_write2_str(p);
+ if (p[0]) {
+ if (p[0] != '\n')
+ full_write2_str(" ");
+ full_write2_str(p);
+ }
full_write2_str("\n");
}
if (ENABLE_FEATURE_CLEAN_UP)
IF_FEATURE_INDIVIDUAL(, char **argv))
{
#ifdef __GLIBC__
- (*(int **)&bb_errno) = __errno_location();
+ (*(int **)not_const_pp(&bb_errno)) = __errno_location();
barrier();
#endif
applet_name = applet;
/* 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");
+ bb_simple_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! */
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");
+ bb_simple_perror_msg_and_die("setresgid");
/* Are we directed to change uid
* (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)?
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");
+ bb_simple_perror_msg_and_die("setresuid");
goto ret;
}
if (!onetime) {
onetime = 1;
- bb_error_msg("using fallback suid method");
+ bb_simple_error_msg("using fallback suid method");
}
}
# endif
/* 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");
+ bb_simple_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);
+ /*
+ * Drop all privileges.
+ *
+ * Don't check for errors: in normal use, they are impossible,
+ * and in special cases, exiting is harmful. Example:
+ * 'unshare --user' when user's shell is also from busybox.
+ *
+ * 'unshare --user' creates a new user namespace without any
+ * uid mappings. Thus, busybox binary is setuid nobody:nogroup
+ * within the namespace, as that is the only user. However,
+ * since no uids are mapped, calls to setgid/setuid
+ * fail (even though they would do nothing).
+ */
+ setgid(rgid);
+ setuid(ruid);
}
# if ENABLE_FEATURE_SUID_CONFIG
ret: ;
* busybox.h::bb_install_loc_t, or else... */
int (*lf)(const char *, const char *);
char *fpc;
- const char *appname = applet_names;
+ const char *appname = applet_names;
unsigned i;
int rc;
}
# endif
-# if ENABLE_BUSYBOX
static void run_applet_and_exit(const char *name, char **argv) NORETURN;
-/* If we were called as "busybox..." */
-static int busybox_main(char **argv)
+# if NUM_SCRIPTS > 0
+static int find_script_by_name(const char *name)
+{
+ int i;
+ int applet = find_applet_by_name(name);
+
+ if (applet >= 0) {
+ for (i = 0; i < NUM_SCRIPTS; ++i)
+ if (applet_numbers[i] == applet)
+ return i;
+ }
+ return -1;
+}
+
+int scripted_main(int argc UNUSED_PARAM, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int scripted_main(int argc UNUSED_PARAM, char **argv)
+{
+ int script = find_script_by_name(applet_name);
+ if (script >= 0)
+#if ENABLE_ASH || ENABLE_SH_IS_ASH || ENABLE_BASH_IS_ASH
+ exit(ash_main(-script - 1, argv));
+#elif ENABLE_HUSH || ENABLE_SH_IS_HUSH || ENABLE_BASH_IS_HUSH
+ exit(hush_main(-script - 1, argv));
+#else
+ return 1;
+#endif
+ return 0;
+}
+
+char* FAST_FUNC
+get_script_content(unsigned n)
+{
+ char *t = unpack_bz2_data(packed_scripts, sizeof(packed_scripts),
+ UNPACKED_SCRIPTS_LENGTH);
+ if (t) {
+ while (n != 0) {
+ while (*t++ != '\0')
+ continue;
+ n--;
+ }
+ }
+ return t;
+}
+# endif /* NUM_SCRIPTS > 0 */
+
+# if ENABLE_BUSYBOX
+# if ENABLE_FEATURE_SH_STANDALONE && ENABLE_FEATURE_TAB_COMPLETION
+ /*
+ * Insert "busybox" into applet table as well.
+ * This makes standalone shell tab-complete this name too.
+ * (Otherwise having "busybox" in applet table is not necessary,
+ * there is other code which routes "busyboxANY_SUFFIX" name
+ * to busybox_main()).
+ */
+//usage:#define busybox_trivial_usage NOUSAGE_STR
+//usage:#define busybox_full_usage ""
+//applet:IF_BUSYBOX(IF_FEATURE_SH_STANDALONE(IF_FEATURE_TAB_COMPLETION(APPLET(busybox, BB_DIR_BIN, BB_SUID_MAYBE))))
+int busybox_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
+# else
+# define busybox_main(argc,argv) busybox_main(argv)
+static
+# endif
+int busybox_main(int argc UNUSED_PARAM, char **argv)
{
if (!argv[1]) {
/* Called without arguments */
int col;
unsigned output_width;
help:
- output_width = 80;
- if (ENABLE_FEATURE_AUTOWIDTH) {
- /* Obtain the terminal width */
- output_width = get_terminal_width(2);
- }
+ output_width = get_terminal_width(2);
dup2(1, 2);
full_write2_str(bb_banner); /* reuse const string */
"\n"
"Usage: busybox [function [arguments]...]\n"
" or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n"
+# if ENABLE_FEATURE_SHOW_SCRIPT && NUM_SCRIPTS > 0
+ " or: busybox --show SCRIPT\n"
+# endif
IF_FEATURE_INSTALLER(
" or: busybox --install [-s] [DIR]\n"
)
"Currently defined functions:\n"
);
col = 0;
- a = applet_names;
/* prevent last comma to be in the very last pos */
output_width--;
+ a = applet_names;
while (*a) {
int len2 = strlen(a) + 2;
if (col >= (int)output_width - len2) {
return 0;
}
+# if ENABLE_FEATURE_SHOW_SCRIPT && NUM_SCRIPTS > 0
+ if (strcmp(argv[1], "--show") == 0) {
+ int n;
+ if (!argv[2])
+ bb_error_msg_and_die(bb_msg_requires_arg, "--show");
+ n = find_script_by_name(argv[2]);
+ if (n < 0)
+ bb_error_msg_and_die("script '%s' not found", argv[2]);
+ full_write1_str(get_script_content(n));
+ return 0;
+ }
+# endif
+
if (is_prefixed_with(argv[1], "--list")) {
unsigned i = 0;
const char *a = applet_names;
# endif
# if NUM_APPLETS > 0
-void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
+void FAST_FUNC run_applet_no_and_exit(int applet_no, const char *name, char **argv)
{
- int argc = 1;
+ int argc = string_array_len(argv);
- while (argv[argc])
- argc++;
-
- /* Reinit some shared global data */
- xfunc_error_retval = EXIT_FAILURE;
- applet_name = bb_get_last_path_component_nostrip(argv[0]);
+ /*
+ * We do not use argv[0]: do not want to repeat massaging of
+ * "-/sbin/halt" -> "halt", for example.
+ */
+ applet_name = name;
/* Special case. POSIX says "test --help"
* should be no different from e.g. "test --foo".
{
# if ENABLE_BUSYBOX
if (is_prefixed_with(name, "busybox"))
- exit(busybox_main(argv));
+ exit(busybox_main(/*unused:*/ 0, argv));
# endif
# if NUM_APPLETS > 0
/* find_applet_by_name() search is more expensive, so goes second */
{
int applet = find_applet_by_name(name);
if (applet >= 0)
- run_applet_no_and_exit(applet, argv);
+ run_applet_no_and_exit(applet, name, argv);
}
# endif
}
/* applet_names in this case is just "applet\0\0" */
lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
+# if ENABLE_BUILD_LIBBUSYBOX
+ return SINGLE_APPLET_MAIN(string_array_len(argv), argv);
+# else
return SINGLE_APPLET_MAIN(argc, argv);
+# endif
#elif !ENABLE_BUSYBOX && NUM_APPLETS == 0
if (applet_name[0] == '-')
applet_name++;
applet_name = bb_basename(applet_name);
+
+ /* If we are a result of execv("/proc/self/exe"), fix ugly comm of "exe" */
+ if (ENABLE_FEATURE_SH_STANDALONE
+ || ENABLE_FEATURE_PREFER_APPLETS
+ || !BB_MMU
+ ) {
+ if (NUM_APPLETS > 1)
+ set_task_comm(applet_name);
+ }
+
parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
run_applet_and_exit(applet_name, argv);
projects / oweals / busybox.git / blobdiff