1 /* vi: set sw=4 ts=4: */
3 * Busybox main internal header file
5 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
6 * Permission has been granted to redistribute this code under the GPL.
8 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
29 #include <sys/ioctl.h>
31 #include <sys/socket.h>
32 #if defined __FreeBSD__
33 #include <netinet/in.h>
34 #include <arpa/inet.h>
38 #include <sys/types.h>
44 /* Try to pull in PATH_MAX */
46 #include <sys/param.h>
55 #ifdef HAVE_SYS_STATFS_H
56 #include <sys/statfs.h>
60 #include <selinux/selinux.h>
61 #include <selinux/context.h>
62 #include <selinux/flask.h>
63 #include <selinux/av_permissions.h>
66 #if ENABLE_LOCALE_SUPPORT
69 #define setlocale(x,y) ((void)0)
78 #if ENABLE_FEATURE_SHADOWPASSWDS
79 # if !ENABLE_USE_BB_SHADOW
80 /* If using busybox's shadow implementation, do not include the shadow.h
81 * header as the toolchain may not provide it at all.
87 /* Some libc's forget to declare these, do it ourself */
89 extern char **environ;
90 #if defined(__GLIBC__) && __GLIBC__ < 2
91 int vdprintf(int d, const char *format, va_list ap);
93 /* klogctl is in libc's klog.h, but we cheat and not #include that */
94 int klogctl(int type, char *b, int len);
95 /* This is declared here rather than #including <libgen.h> in order to avoid
96 * confusing the two versions of basename. See the dirname/basename man page
98 #if !defined __FreeBSD__
99 char *dirname(char *path);
101 /* Include our own copy of struct sysinfo to avoid binary compatibility
102 * problems with Linux 2.4, which changed things. Grumble, grumble. */
104 long uptime; /* Seconds since boot */
105 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
106 unsigned long totalram; /* Total usable main memory size */
107 unsigned long freeram; /* Available memory size */
108 unsigned long sharedram; /* Amount of shared memory */
109 unsigned long bufferram; /* Memory used by buffers */
110 unsigned long totalswap; /* Total swap space size */
111 unsigned long freeswap; /* swap space still available */
112 unsigned short procs; /* Number of current processes */
113 unsigned short pad; /* Padding needed for m68k */
114 unsigned long totalhigh; /* Total high memory size */
115 unsigned long freehigh; /* Available high memory size */
116 unsigned int mem_unit; /* Memory unit size in bytes */
117 char _f[20 - 2 * sizeof(long) - sizeof(int)]; /* Padding: libc5 uses this.. */
119 int sysinfo(struct sysinfo* info);
122 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
123 /* (don't include system headers after this until corresponding pop!) */
124 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
127 #if ENABLE_USE_BB_PWD_GRP
131 #if ENABLE_FEATURE_SHADOWPASSWDS
132 # if ENABLE_USE_BB_SHADOW
133 # include "shadow_.h"
137 /* Tested to work correctly with all int types (IIRC :]) */
138 #define MAXINT(T) (T)( \
141 : (T)~((T)1 << (sizeof(T)*8-1)) \
144 #define MININT(T) (T)( \
147 : ((T)1 << (sizeof(T)*8-1)) \
150 /* Large file support */
151 /* Note that CONFIG_LFS=y forces bbox to be built with all common ops
152 * (stat, lseek etc) mapped to "largefile" variants by libc.
153 * Practically it means that open() automatically has O_LARGEFILE added
154 * and all filesize/file_offset parameters and struct members are "large"
155 * (in today's world - signed 64bit). For full support of large files,
156 * we need a few helper #defines (below) and careful use of off_t
157 * instead of int/ssize_t. No lseek64(), O_LARGEFILE etc necessary */
159 /* CONFIG_LFS is on */
160 # if ULONG_MAX > 0xffffffff
161 /* "long" is long enough on this system */
162 typedef unsigned long uoff_t;
163 # define XATOOFF(a) xatoul_range(a, 0, LONG_MAX)
164 /* usage: sz = BB_STRTOOFF(s, NULL, 10); if (errno || sz < 0) die(); */
165 # define BB_STRTOOFF bb_strtoul
166 # define STRTOOFF strtoul
167 /* usage: printf("size: %"OFF_FMT"d (%"OFF_FMT"x)\n", sz, sz); */
170 /* "long" is too short, need "long long" */
171 typedef unsigned long long uoff_t;
172 # define XATOOFF(a) xatoull_range(a, 0, LLONG_MAX)
173 # define BB_STRTOOFF bb_strtoull
174 # define STRTOOFF strtoull
175 # define OFF_FMT "ll"
178 /* CONFIG_LFS is off */
179 # if UINT_MAX == 0xffffffff
180 /* While sizeof(off_t) == sizeof(int), off_t is typedef'ed to long anyway.
181 * gcc will throw warnings on printf("%d", off_t). Crap... */
182 typedef unsigned long uoff_t;
183 # define XATOOFF(a) xatoi_u(a)
184 # define BB_STRTOOFF bb_strtou
185 # define STRTOOFF strtol
188 typedef unsigned long uoff_t;
189 # define XATOOFF(a) xatoul_range(a, 0, LONG_MAX)
190 # define BB_STRTOOFF bb_strtoul
191 # define STRTOOFF strtol
195 /* scary. better ideas? (but do *test* them first!) */
196 #define OFF_T_MAX ((off_t)~((off_t)1 << (sizeof(off_t)*8-1)))
198 /* Some useful definitions */
200 #define FALSE ((int) 0)
202 #define TRUE ((int) 1)
204 #define SKIP ((int) 2)
207 #define MTAB_GETMOUNTPT '1'
208 #define MTAB_GETDEVICE '2'
210 #define BUF_SIZE 8192
211 #define EXPAND_ALLOC 1024
213 /* Macros for min/max. */
215 #define MIN(a,b) (((a)<(b))?(a):(b))
219 #define MAX(a,b) (((a)>(b))?(a):(b))
222 /* buffer allocation schemes */
223 #if ENABLE_FEATURE_BUFFERS_GO_ON_STACK
224 #define RESERVE_CONFIG_BUFFER(buffer,len) char buffer[len]
225 #define RESERVE_CONFIG_UBUFFER(buffer,len) unsigned char buffer[len]
226 #define RELEASE_CONFIG_BUFFER(buffer) ((void)0)
228 #if ENABLE_FEATURE_BUFFERS_GO_IN_BSS
229 #define RESERVE_CONFIG_BUFFER(buffer,len) static char buffer[len]
230 #define RESERVE_CONFIG_UBUFFER(buffer,len) static unsigned char buffer[len]
231 #define RELEASE_CONFIG_BUFFER(buffer) ((void)0)
233 #define RESERVE_CONFIG_BUFFER(buffer,len) char *buffer = xmalloc(len)
234 #define RESERVE_CONFIG_UBUFFER(buffer,len) unsigned char *buffer = xmalloc(len)
235 #define RELEASE_CONFIG_BUFFER(buffer) free(buffer)
239 #if defined(__GLIBC__)
240 /* glibc uses __errno_location() to get a ptr to errno */
241 /* We can just memorize it once - no multithreading in busybox :) */
242 extern int *const bb_errno;
244 #define errno (*bb_errno)
247 unsigned long long monotonic_ns(void) FAST_FUNC;
248 unsigned long long monotonic_us(void) FAST_FUNC;
249 unsigned monotonic_sec(void) FAST_FUNC;
251 extern void chomp(char *s) FAST_FUNC;
252 extern void trim(char *s) FAST_FUNC;
253 extern char *skip_whitespace(const char *) FAST_FUNC;
254 extern char *skip_non_whitespace(const char *) FAST_FUNC;
255 extern char *strrstr(const char *haystack, const char *needle) FAST_FUNC;
257 //TODO: supply a pointer to char[11] buffer (avoid statics)?
258 extern const char *bb_mode_string(mode_t mode) FAST_FUNC;
259 extern int is_directory(const char *name, int followLinks, struct stat *statBuf) FAST_FUNC;
260 enum { /* DO NOT CHANGE THESE VALUES! cp.c, mv.c, install.c depend on them. */
261 FILEUTILS_PRESERVE_STATUS = 1,
262 FILEUTILS_DEREFERENCE = 2,
265 FILEUTILS_INTERACTIVE = 0x10,
266 FILEUTILS_MAKE_HARDLINK = 0x20,
267 FILEUTILS_MAKE_SOFTLINK = 0x40,
268 FILEUTILS_DEREF_SOFTLINK = 0x80,
270 FILEUTILS_PRESERVE_SECURITY_CONTEXT = 0x100,
271 FILEUTILS_SET_SECURITY_CONTEXT = 0x200
274 #define FILEUTILS_CP_OPTSTR "pdRfilsL" IF_SELINUX("c")
275 extern int remove_file(const char *path, int flags) FAST_FUNC;
276 /* NB: without FILEUTILS_RECUR in flags, it will basically "cat"
277 * the source, not copy (unless "source" is a directory).
278 * This makes "cp /dev/null file" and "install /dev/null file" (!!!)
279 * work coreutils-compatibly. */
280 extern int copy_file(const char *source, const char *dest, int flags) FAST_FUNC;
283 ACTION_RECURSE = (1 << 0),
284 ACTION_FOLLOWLINKS = (1 << 1),
285 ACTION_FOLLOWLINKS_L0 = (1 << 2),
286 ACTION_DEPTHFIRST = (1 << 3),
287 /*ACTION_REVERSE = (1 << 4), - unused */
288 ACTION_QUIET = (1 << 5),
290 extern int recursive_action(const char *fileName, unsigned flags,
291 int FAST_FUNC (*fileAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
292 int FAST_FUNC (*dirAction)(const char *fileName, struct stat* statbuf, void* userData, int depth),
293 void* userData, unsigned depth) FAST_FUNC;
294 extern int device_open(const char *device, int mode) FAST_FUNC;
295 enum { GETPTY_BUFSIZE = 16 }; /* more than enough for "/dev/ttyXXX" */
296 extern int xgetpty(char *line) FAST_FUNC;
297 extern int get_console_fd_or_die(void) FAST_FUNC;
298 extern void console_make_active(int fd, const int vt_num) FAST_FUNC;
299 extern char *find_block_device(const char *path) FAST_FUNC;
300 /* bb_copyfd_XX print read/write errors and return -1 if they occur */
301 extern off_t bb_copyfd_eof(int fd1, int fd2) FAST_FUNC;
302 extern off_t bb_copyfd_size(int fd1, int fd2, off_t size) FAST_FUNC;
303 extern void bb_copyfd_exact_size(int fd1, int fd2, off_t size) FAST_FUNC;
304 /* "short" copy can be detected by return value < size */
305 /* this helper yells "short read!" if param is not -1 */
306 extern void complain_copyfd_and_die(off_t sz) NORETURN FAST_FUNC;
307 extern char bb_process_escape_sequence(const char **ptr) FAST_FUNC;
308 /* xxxx_strip version can modify its parameter:
312 * "abc/def/" -> "def" !!
314 extern char *bb_get_last_path_component_strip(char *path) FAST_FUNC;
315 /* "abc/def/" -> "" and it never modifies 'path' */
316 extern char *bb_get_last_path_component_nostrip(const char *path) FAST_FUNC;
318 int ndelay_on(int fd) FAST_FUNC;
319 int ndelay_off(int fd) FAST_FUNC;
320 int close_on_exec_on(int fd) FAST_FUNC;
321 void xdup2(int, int) FAST_FUNC;
322 void xmove_fd(int, int) FAST_FUNC;
325 DIR *xopendir(const char *path) FAST_FUNC;
326 DIR *warn_opendir(const char *path) FAST_FUNC;
328 /* UNUSED: char *xmalloc_realpath(const char *path) FAST_FUNC; */
329 char *xmalloc_readlink(const char *path) FAST_FUNC;
330 char *xmalloc_readlink_or_warn(const char *path) FAST_FUNC;
331 char *xrealloc_getcwd_or_warn(char *cwd) FAST_FUNC;
333 char *xmalloc_follow_symlinks(const char *path) FAST_FUNC;
337 /* bb_signals(BB_FATAL_SIGS, handler) catches all signals which
338 * otherwise would kill us, except for those resulting from bugs:
339 * SIGSEGV, SIGILL, SIGFPE.
340 * Other fatal signals not included (TODO?):
341 * SIGBUS Bus error (bad memory access)
342 * SIGPOLL Pollable event. Synonym of SIGIO
343 * SIGPROF Profiling timer expired
344 * SIGSYS Bad argument to routine
345 * SIGTRAP Trace/breakpoint trap
347 * The only known arch with some of these sigs not fitting
348 * into 32 bits is parisc (SIGXCPU=33, SIGXFSZ=34, SIGSTKFLT=36).
349 * Dance around with long long to guard against that...
351 BB_FATAL_SIGS = (int)(0
355 + (1LL << SIGPIPE) // Write to pipe with no readers
356 + (1LL << SIGQUIT) // Quit from keyboard
357 + (1LL << SIGABRT) // Abort signal from abort(3)
358 + (1LL << SIGALRM) // Timer signal from alarm(2)
359 + (1LL << SIGVTALRM) // Virtual alarm clock
360 + (1LL << SIGXCPU) // CPU time limit exceeded
361 + (1LL << SIGXFSZ) // File size limit exceeded
362 + (1LL << SIGUSR1) // Yes kids, these are also fatal!
366 void bb_signals(int sigs, void (*f)(int)) FAST_FUNC;
367 /* Unlike signal() and bb_signals, sets handler with sigaction()
368 * and in a way that while signal handler is run, no other signals
369 * will be blocked; syscalls will not be restarted: */
370 void bb_signals_recursive_norestart(int sigs, void (*f)(int)) FAST_FUNC;
371 /* syscalls like read() will be interrupted with EINTR: */
372 void signal_no_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
373 /* syscalls like read() won't be interrupted (though select/poll will be): */
374 void signal_SA_RESTART_empty_mask(int sig, void (*handler)(int)) FAST_FUNC;
375 void wait_for_any_sig(void) FAST_FUNC;
376 void kill_myself_with_sig(int sig) NORETURN FAST_FUNC;
377 void sig_block(int sig) FAST_FUNC;
378 void sig_unblock(int sig) FAST_FUNC;
379 /* Will do sigaction(signum, act, NULL): */
380 int sigaction_set(int sig, const struct sigaction *act) FAST_FUNC;
381 /* SIG_BLOCK/SIG_UNBLOCK all signals: */
382 int sigprocmask_allsigs(int how) FAST_FUNC;
383 /* Standard handler which just records signo */
384 extern smallint bb_got_signal;
385 void record_signo(int signo); /* not FAST_FUNC! */
388 void xsetgid(gid_t gid) FAST_FUNC;
389 void xsetuid(uid_t uid) FAST_FUNC;
390 void xchdir(const char *path) FAST_FUNC;
391 void xchroot(const char *path) FAST_FUNC;
392 void xsetenv(const char *key, const char *value) FAST_FUNC;
393 void bb_unsetenv(const char *key) FAST_FUNC;
394 void xunlink(const char *pathname) FAST_FUNC;
395 void xstat(const char *pathname, struct stat *buf) FAST_FUNC;
396 int xopen(const char *pathname, int flags) FAST_FUNC FAST_FUNC;
397 int xopen3(const char *pathname, int flags, int mode) FAST_FUNC;
398 int open_or_warn(const char *pathname, int flags) FAST_FUNC;
399 int open3_or_warn(const char *pathname, int flags, int mode) FAST_FUNC;
400 int open_or_warn_stdin(const char *pathname) FAST_FUNC;
401 void xrename(const char *oldpath, const char *newpath) FAST_FUNC;
402 int rename_or_warn(const char *oldpath, const char *newpath) FAST_FUNC;
403 off_t xlseek(int fd, off_t offset, int whence) FAST_FUNC;
404 off_t fdlength(int fd) FAST_FUNC;
406 void xpipe(int filedes[2]) FAST_FUNC;
407 /* In this form code with pipes is much more readable */
408 struct fd_pair { int rd; int wr; };
409 #define piped_pair(pair) pipe(&((pair).rd))
410 #define xpiped_pair(pair) xpipe(&((pair).rd))
412 /* Useful for having small structure members/global variables */
413 typedef int8_t socktype_t;
414 typedef int8_t family_t;
415 struct BUG_too_small {
416 char BUG_socktype_t_too_small[(0
423 char BUG_family_t_too_small[(0
440 int xsocket(int domain, int type, int protocol) FAST_FUNC;
441 void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen) FAST_FUNC;
442 void xlisten(int s, int backlog) FAST_FUNC;
443 void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen) FAST_FUNC;
444 ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
445 socklen_t tolen) FAST_FUNC;
446 /* SO_REUSEADDR allows a server to rebind to an address that is already
447 * "in use" by old connections to e.g. previous server instance which is
448 * killed or crashed. Without it bind will fail until all such connections
449 * time out. Linux does not allow multiple live binds on same ip:port
450 * regardless of SO_REUSEADDR (unlike some other flavors of Unix).
451 * Turn it on before you call bind(). */
452 void setsockopt_reuseaddr(int fd) FAST_FUNC; /* On Linux this never fails. */
453 int setsockopt_broadcast(int fd) FAST_FUNC;
454 int setsockopt_bindtodevice(int fd, const char *iface) FAST_FUNC;
455 /* NB: returns port in host byte order */
456 unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port) FAST_FUNC;
457 typedef struct len_and_sockaddr {
461 struct sockaddr_in sin;
462 #if ENABLE_FEATURE_IPV6
463 struct sockaddr_in6 sin6;
468 LSA_LEN_SIZE = offsetof(len_and_sockaddr, u),
469 LSA_SIZEOF_SA = sizeof(
472 struct sockaddr_in sin;
473 #if ENABLE_FEATURE_IPV6
474 struct sockaddr_in6 sin6;
479 /* Create stream socket, and allocate suitable lsa.
480 * (lsa of correct size and lsa->sa.sa_family (AF_INET/AF_INET6))
481 * af == AF_UNSPEC will result in trying to create IPv6 socket,
482 * and if kernel doesn't support it, IPv4.
484 #if ENABLE_FEATURE_IPV6
485 int xsocket_type(len_and_sockaddr **lsap, int af, int sock_type) FAST_FUNC;
487 int xsocket_type(len_and_sockaddr **lsap, int sock_type) FAST_FUNC;
488 #define xsocket_type(lsap, af, sock_type) xsocket_type((lsap), (sock_type))
490 int xsocket_stream(len_and_sockaddr **lsap) FAST_FUNC;
491 /* Create server socket bound to bindaddr:port. bindaddr can be NULL,
492 * numeric IP ("N.N.N.N") or numeric IPv6 address,
493 * and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
494 * Only if there is no suffix, port argument is used */
495 /* NB: these set SO_REUSEADDR before bind */
496 int create_and_bind_stream_or_die(const char *bindaddr, int port) FAST_FUNC;
497 int create_and_bind_dgram_or_die(const char *bindaddr, int port) FAST_FUNC;
498 /* Create client TCP socket connected to peer:port. Peer cannot be NULL.
499 * Peer can be numeric IP ("N.N.N.N"), numeric IPv6 address or hostname,
500 * and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
501 * If there is no suffix, port argument is used */
502 int create_and_connect_stream_or_die(const char *peer, int port) FAST_FUNC;
503 /* Connect to peer identified by lsa */
504 int xconnect_stream(const len_and_sockaddr *lsa) FAST_FUNC;
505 /* Get local address of bound or accepted socket */
506 len_and_sockaddr *get_sock_lsa(int fd) FAST_FUNC;
507 /* Return malloc'ed len_and_sockaddr with socket address of host:port
508 * Currently will return IPv4 or IPv6 sockaddrs only
509 * (depending on host), but in theory nothing prevents e.g.
510 * UNIX socket address being returned, IPX sockaddr etc...
511 * On error does bb_error_msg and returns NULL */
512 len_and_sockaddr* host2sockaddr(const char *host, int port) FAST_FUNC;
513 /* Version which dies on error */
514 len_and_sockaddr* xhost2sockaddr(const char *host, int port) FAST_FUNC;
515 len_and_sockaddr* xdotted2sockaddr(const char *host, int port) FAST_FUNC;
516 /* Same, useful if you want to force family (e.g. IPv6) */
517 #if !ENABLE_FEATURE_IPV6
518 #define host_and_af2sockaddr(host, port, af) host2sockaddr((host), (port))
519 #define xhost_and_af2sockaddr(host, port, af) xhost2sockaddr((host), (port))
521 len_and_sockaddr* host_and_af2sockaddr(const char *host, int port, sa_family_t af) FAST_FUNC;
522 len_and_sockaddr* xhost_and_af2sockaddr(const char *host, int port, sa_family_t af) FAST_FUNC;
524 /* Assign sin[6]_port member if the socket is an AF_INET[6] one,
525 * otherwise no-op. Useful for ftp.
526 * NB: does NOT do htons() internally, just direct assignment. */
527 void set_nport(len_and_sockaddr *lsa, unsigned port) FAST_FUNC;
528 /* Retrieve sin[6]_port or return -1 for non-INET[6] lsa's */
529 int get_nport(const struct sockaddr *sa) FAST_FUNC;
530 /* Reverse DNS. Returns NULL on failure. */
531 char* xmalloc_sockaddr2host(const struct sockaddr *sa) FAST_FUNC;
532 /* This one doesn't append :PORTNUM */
533 char* xmalloc_sockaddr2host_noport(const struct sockaddr *sa) FAST_FUNC;
534 /* This one also doesn't fall back to dotted IP (returns NULL) */
535 char* xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa) FAST_FUNC;
536 /* inet_[ap]ton on steroids */
537 char* xmalloc_sockaddr2dotted(const struct sockaddr *sa) FAST_FUNC;
538 char* xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa) FAST_FUNC;
539 // "old" (ipv4 only) API
540 // users: traceroute.c hostname.c - use _list_ of all IPs
541 struct hostent *xgethostbyname(const char *name) FAST_FUNC;
542 // Also mount.c and inetd.c are using gethostbyname(),
543 // + inet_common.c has additional IPv4-only stuff
546 void socket_want_pktinfo(int fd) FAST_FUNC;
547 ssize_t send_to_from(int fd, void *buf, size_t len, int flags,
548 const struct sockaddr *to,
549 const struct sockaddr *from,
550 socklen_t tolen) FAST_FUNC;
551 ssize_t recv_from_to(int fd, void *buf, size_t len, int flags,
552 struct sockaddr *from,
554 socklen_t sa_size) FAST_FUNC;
556 char *xstrdup(const char *s) FAST_FUNC;
557 char *xstrndup(const char *s, int n) FAST_FUNC;
558 void overlapping_strcpy(char *dst, const char *src) FAST_FUNC;
559 char *safe_strncpy(char *dst, const char *src, size_t size) FAST_FUNC;
560 char *strncpy_IFNAMSIZ(char *dst, const char *src) FAST_FUNC;
561 /* Guaranteed to NOT be a macro (smallest code). Saves nearly 2k on uclibc.
562 * But potentially slow, don't use in one-billion-times loops */
563 int bb_putchar(int ch) FAST_FUNC;
564 char *xasprintf(const char *format, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
565 /* Prints unprintable chars ch as ^C or M-c to file
566 * (M-c is used only if ch is ORed with PRINTABLE_META),
567 * else it is printed as-is (except for ch = 0x9b) */
568 enum { PRINTABLE_META = 0x100 };
569 void fputc_printable(int ch, FILE *file) FAST_FUNC;
570 // gcc-4.1.1 still isn't good enough at optimizing it
571 // (+200 bytes compared to macro)
572 //static ALWAYS_INLINE
573 //int LONE_DASH(const char *s) { return s[0] == '-' && !s[1]; }
574 //static ALWAYS_INLINE
575 //int NOT_LONE_DASH(const char *s) { return s[0] != '-' || s[1]; }
576 #define LONE_DASH(s) ((s)[0] == '-' && !(s)[1])
577 #define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1])
578 #define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
579 #define NOT_LONE_CHAR(s,c) ((s)[0] != (c) || (s)[1])
580 #define DOT_OR_DOTDOT(s) ((s)[0] == '.' && (!(s)[1] || ((s)[1] == '.' && !(s)[2])))
582 /* dmalloc will redefine these to it's own implementation. It is safe
583 * to have the prototypes here unconditionally. */
584 void *malloc_or_warn(size_t size) FAST_FUNC;
585 void *xmalloc(size_t size) FAST_FUNC;
586 void *xzalloc(size_t size) FAST_FUNC;
587 void *xrealloc(void *old, size_t size) FAST_FUNC;
588 /* After xrealloc_vector(v, 4, idx) it's ok to use
589 * at least v[idx] and v[idx+1], for all idx values.
590 * shift specifies how many new elements are added (1: 2, 2: 4... 8: 256...)
591 * when all elements are used up. New elements are zeroed out. */
592 #define xrealloc_vector(vector, shift, idx) \
593 xrealloc_vector_helper((vector), (sizeof((vector)[0]) << 8) + (shift), (idx))
594 void* xrealloc_vector_helper(void *vector, unsigned sizeof_and_shift, int idx) FAST_FUNC;
597 extern ssize_t safe_read(int fd, void *buf, size_t count) FAST_FUNC;
598 extern ssize_t nonblock_safe_read(int fd, void *buf, size_t count) FAST_FUNC;
599 // NB: will return short read on error, not -1,
600 // if some data was read before error occurred
601 extern ssize_t full_read(int fd, void *buf, size_t count) FAST_FUNC;
602 extern void xread(int fd, void *buf, size_t count) FAST_FUNC;
603 extern unsigned char xread_char(int fd) FAST_FUNC;
604 extern ssize_t read_close(int fd, void *buf, size_t maxsz) FAST_FUNC;
605 extern ssize_t open_read_close(const char *filename, void *buf, size_t maxsz) FAST_FUNC;
606 // Reads one line a-la fgets (but doesn't save terminating '\n').
607 // Reads byte-by-byte. Useful when it is important to not read ahead.
608 // Bytes are appended to pfx (which must be malloced, or NULL).
609 extern char *xmalloc_reads(int fd, char *pfx, size_t *maxsz_p) FAST_FUNC;
610 /* Reads block up to *maxsz_p (default: INT_MAX - 4095) */
611 extern void *xmalloc_read(int fd, size_t *maxsz_p) FAST_FUNC;
612 /* Returns NULL if file can't be opened (default max size: INT_MAX - 4095) */
613 extern void *xmalloc_open_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC;
614 /* Autodetects .gz etc */
615 extern int open_zipped(const char *fname) FAST_FUNC;
616 extern void *xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p) FAST_FUNC;
617 /* Never returns NULL */
618 extern void *xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p) FAST_FUNC;
620 extern ssize_t safe_write(int fd, const void *buf, size_t count) FAST_FUNC;
621 // NB: will return short write on error, not -1,
622 // if some data was written before error occurred
623 extern ssize_t full_write(int fd, const void *buf, size_t count) FAST_FUNC;
624 extern void xwrite(int fd, const void *buf, size_t count) FAST_FUNC;
625 extern void xwrite_str(int fd, const char *str) FAST_FUNC;
626 extern void xopen_xwrite_close(const char* file, const char *str) FAST_FUNC;
628 /* Reads and prints to stdout till eof, then closes FILE. Exits on error: */
629 extern void xprint_and_close_file(FILE *file) FAST_FUNC;
631 extern char *bb_get_chunk_from_file(FILE *file, int *end) FAST_FUNC;
632 extern char *bb_get_chunk_with_continuation(FILE *file, int *end, int *lineno) FAST_FUNC;
633 /* Reads up to (and including) TERMINATING_STRING: */
634 extern char *xmalloc_fgets_str(FILE *file, const char *terminating_string) FAST_FUNC;
635 /* Same, with limited max size, and returns the length (excluding NUL): */
636 extern char *xmalloc_fgets_str_len(FILE *file, const char *terminating_string, size_t *maxsz_p) FAST_FUNC;
637 /* Chops off TERMINATING_STRING from the end: */
638 extern char *xmalloc_fgetline_str(FILE *file, const char *terminating_string) FAST_FUNC;
639 /* Reads up to (and including) "\n" or NUL byte: */
640 extern char *xmalloc_fgets(FILE *file) FAST_FUNC;
641 /* Chops off '\n' from the end, unlike fgets: */
642 extern char *xmalloc_fgetline(FILE *file) FAST_FUNC;
643 /* Same, but doesn't try to conserve space (may have some slack after the end) */
644 /* extern char *xmalloc_fgetline_fast(FILE *file) FAST_FUNC; */
646 extern void die_if_ferror(FILE *file, const char *msg) FAST_FUNC;
647 extern void die_if_ferror_stdout(void) FAST_FUNC;
648 extern void xfflush_stdout(void) FAST_FUNC;
649 extern void fflush_stdout_and_exit(int retval) NORETURN FAST_FUNC;
650 extern int fclose_if_not_stdin(FILE *file) FAST_FUNC;
651 extern FILE *xfopen(const char *filename, const char *mode) FAST_FUNC;
652 /* Prints warning to stderr and returns NULL on failure: */
653 extern FILE *fopen_or_warn(const char *filename, const char *mode) FAST_FUNC;
654 /* "Opens" stdin if filename is special, else just opens file: */
655 extern FILE *xfopen_stdin(const char *filename) FAST_FUNC;
656 extern FILE *fopen_or_warn_stdin(const char *filename) FAST_FUNC;
657 extern FILE* fopen_for_read(const char *path) FAST_FUNC;
658 extern FILE* xfopen_for_read(const char *path) FAST_FUNC;
659 extern FILE* fopen_for_write(const char *path) FAST_FUNC;
660 extern FILE* xfopen_for_write(const char *path) FAST_FUNC;
662 int bb_pstrcmp(const void *a, const void *b) /* not FAST_FUNC! */;
663 void qsort_string_vector(char **sv, unsigned count) FAST_FUNC;
665 /* Wrapper which restarts poll on EINTR or ENOMEM.
666 * On other errors complains [perror("poll")] and returns.
667 * Warning! May take (much) longer than timeout_ms to return!
668 * If this is a problem, use bare poll and open-code EINTR/ENOMEM handling */
669 int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout_ms) FAST_FUNC;
671 char *safe_gethostname(void) FAST_FUNC;
672 char *safe_getdomainname(void) FAST_FUNC;
674 /* Convert each alpha char in str to lower-case */
675 char* str_tolower(char *str) FAST_FUNC;
677 char *utoa(unsigned n) FAST_FUNC;
678 char *itoa(int n) FAST_FUNC;
679 /* Returns a pointer past the formatted number, does NOT null-terminate */
680 char *utoa_to_buf(unsigned n, char *buf, unsigned buflen) FAST_FUNC;
681 char *itoa_to_buf(int n, char *buf, unsigned buflen) FAST_FUNC;
682 /* Intelligent formatters of bignums */
683 void smart_ulltoa4(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
684 void smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale) FAST_FUNC;
685 //TODO: provide pointer to buf (avoid statics)?
686 const char *make_human_readable_str(unsigned long long size,
687 unsigned long block_size, unsigned long display_unit) FAST_FUNC;
688 /* Put a string of hex bytes ("1b2e66fe"...), return advanced pointer */
689 char *bin2hex(char *buf, const char *cp, int count) FAST_FUNC;
691 /* Last element is marked by mult == 0 */
698 /* Using xatoi() instead of naive atoi() is not always convenient -
699 * in many places people want *non-negative* values, but store them
700 * in signed int. Therefore we need this one:
701 * dies if input is not in [0, INT_MAX] range. Also will reject '-0' etc */
702 int xatoi_u(const char *numstr) FAST_FUNC;
703 /* Useful for reading port numbers */
704 uint16_t xatou16(const char *numstr) FAST_FUNC;
707 /* These parse entries in /etc/passwd and /etc/group. This is desirable
708 * for BusyBox since we want to avoid using the glibc NSS stuff, which
709 * increases target size and is often not needed on embedded systems. */
710 long xuname2uid(const char *name) FAST_FUNC;
711 long xgroup2gid(const char *name) FAST_FUNC;
712 /* wrapper: allows string to contain numeric uid or gid */
713 unsigned long get_ug_id(const char *s, long FAST_FUNC (*xname2id)(const char *)) FAST_FUNC;
714 /* from chpst. Does not die, returns 0 on failure */
719 /* always sets uid and gid */
720 int get_uidgid(struct bb_uidgid_t*, const char*, int numeric_ok) FAST_FUNC;
721 /* always sets uid and gid, allows numeric; exits on failure */
722 void xget_uidgid(struct bb_uidgid_t*, const char*) FAST_FUNC;
723 /* chown-like handling of "user[:[group]" */
724 void parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group) FAST_FUNC;
725 struct passwd* xgetpwnam(const char *name) FAST_FUNC;
726 struct group* xgetgrnam(const char *name) FAST_FUNC;
727 struct passwd* xgetpwuid(uid_t uid) FAST_FUNC;
728 struct group* xgetgrgid(gid_t gid) FAST_FUNC;
729 char* xuid2uname(uid_t uid) FAST_FUNC;
730 char* xgid2group(gid_t gid) FAST_FUNC;
731 char* uid2uname(uid_t uid) FAST_FUNC;
732 char* gid2group(gid_t gid) FAST_FUNC;
733 char* uid2uname_utoa(long uid) FAST_FUNC;
734 char* gid2group_utoa(long gid) FAST_FUNC;
735 /* versions which cache results (useful for ps, ls etc) */
736 const char* get_cached_username(uid_t uid) FAST_FUNC;
737 const char* get_cached_groupname(gid_t gid) FAST_FUNC;
738 void clear_username_cache(void) FAST_FUNC;
739 /* internally usernames are saved in fixed-sized char[] buffers */
740 enum { USERNAME_MAX_SIZE = 16 - sizeof(int) };
741 #if ENABLE_FEATURE_CHECK_NAMES
742 void die_if_bad_username(const char* name) FAST_FUNC;
744 #define die_if_bad_username(name) ((void)(name))
747 int execable_file(const char *name) FAST_FUNC;
748 char *find_execable(const char *filename, char **PATHp) FAST_FUNC;
749 int exists_execable(const char *filename) FAST_FUNC;
751 /* BB_EXECxx always execs (it's not doing NOFORK/NOEXEC stuff),
752 * but it may exec busybox and call applet instead of searching PATH.
754 #if ENABLE_FEATURE_PREFER_APPLETS
755 int bb_execvp(const char *file, char *const argv[]) FAST_FUNC;
756 #define BB_EXECVP(prog,cmd) bb_execvp(prog,cmd)
757 #define BB_EXECLP(prog,cmd,...) \
758 execlp((find_applet_by_name(prog) >= 0) ? CONFIG_BUSYBOX_EXEC_PATH : prog, \
761 #define BB_EXECVP(prog,cmd) execvp(prog,cmd)
762 #define BB_EXECLP(prog,cmd,...) execlp(prog,cmd, __VA_ARGS__)
765 /* NOMMU friendy fork+exec */
766 pid_t spawn(char **argv) FAST_FUNC;
767 pid_t xspawn(char **argv) FAST_FUNC;
769 pid_t safe_waitpid(pid_t pid, int *wstat, int options) FAST_FUNC;
770 /* Unlike waitpid, waits ONLY for one process.
771 * It's safe to pass negative 'pids' from failed [v]fork -
772 * wait4pid will return -1 (and will not clobber [v]fork's errno).
773 * IOW: rc = wait4pid(spawn(argv));
774 * if (rc < 0) bb_perror_msg("%s", argv[0]);
775 * if (rc > 0) bb_error_msg("exit code: %d", rc);
777 int wait4pid(pid_t pid) FAST_FUNC;
778 pid_t wait_any_nohang(int *wstat) FAST_FUNC;
779 /* wait4pid(spawn(argv)) + NOFORK/NOEXEC (if configured) */
780 int spawn_and_wait(char **argv) FAST_FUNC;
781 struct nofork_save_area {
783 const char *applet_name;
784 int xfunc_error_retval;
785 uint32_t option_mask32;
789 void save_nofork_data(struct nofork_save_area *save) FAST_FUNC;
790 void restore_nofork_data(struct nofork_save_area *save) FAST_FUNC;
791 /* Does NOT check that applet is NOFORK, just blindly runs it */
792 int run_nofork_applet(int applet_no, char **argv) FAST_FUNC;
793 int run_nofork_applet_prime(struct nofork_save_area *old, int applet_no, char **argv) FAST_FUNC;
795 /* Helpers for daemonization.
797 * bb_daemonize(flags) = daemonize, does not compile on NOMMU
799 * bb_daemonize_or_rexec(flags, argv) = daemonizes on MMU (and ignores argv),
800 * rexec's itself on NOMMU with argv passed as command line.
801 * Thus bb_daemonize_or_rexec may cause your <applet>_main() to be re-executed
802 * from the start. (It will detect it and not reexec again second time).
803 * You have to audit carefully that you don't do something twice as a result
804 * (opening files/sockets, parsing config files etc...)!
806 * Both of the above will redirect fd 0,1,2 to /dev/null and drop ctty
807 * (will do setsid()).
809 * fork_or_rexec(argv) = bare-bones "fork" on MMU,
810 * "vfork + re-exec ourself" on NOMMU. No fd redirection, no setsid().
811 * On MMU ignores argv.
813 * Helper for network daemons in foreground mode:
815 * bb_sanitize_stdio() = make sure that fd 0,1,2 are opened by opening them
816 * to /dev/null if they are not.
819 DAEMON_CHDIR_ROOT = 1,
820 DAEMON_DEVNULL_STDIO = 2,
821 DAEMON_CLOSE_EXTRA_FDS = 4,
822 DAEMON_ONLY_SANITIZE = 8, /* internal use */
825 pid_t fork_or_rexec(void) FAST_FUNC;
826 enum { re_execed = 0 };
827 # define fork_or_rexec(argv) fork_or_rexec()
828 # define bb_daemonize_or_rexec(flags, argv) bb_daemonize_or_rexec(flags)
829 # define bb_daemonize(flags) bb_daemonize_or_rexec(flags, bogus)
831 void re_exec(char **argv) NORETURN FAST_FUNC;
832 pid_t fork_or_rexec(char **argv) FAST_FUNC;
833 extern bool re_execed;
834 int BUG_fork_is_unavailable_on_nommu(void) FAST_FUNC;
835 int BUG_daemon_is_unavailable_on_nommu(void) FAST_FUNC;
836 void BUG_bb_daemonize_is_unavailable_on_nommu(void) FAST_FUNC;
837 # define fork() BUG_fork_is_unavailable_on_nommu()
838 # define daemon(a,b) BUG_daemon_is_unavailable_on_nommu()
839 # define bb_daemonize(a) BUG_bb_daemonize_is_unavailable_on_nommu()
841 void bb_daemonize_or_rexec(int flags, char **argv) FAST_FUNC;
842 void bb_sanitize_stdio(void) FAST_FUNC;
843 /* Clear dangerous stuff, set PATH. Return 1 if was run by different user. */
844 int sanitize_env_if_suid(void) FAST_FUNC;
847 extern const char *const bb_argv_dash[]; /* "-", NULL */
848 extern const char *opt_complementary;
849 #if ENABLE_LONG_OPTS || ENABLE_FEATURE_GETOPT_LONG
850 #define No_argument "\0"
851 #define Required_argument "\001"
852 #define Optional_argument "\002"
853 extern const char *applet_long_options;
855 extern uint32_t option_mask32;
856 extern uint32_t getopt32(char **argv, const char *applet_opts, ...) FAST_FUNC;
859 typedef struct llist_t {
861 struct llist_t *link;
863 void llist_add_to(llist_t **old_head, void *data) FAST_FUNC;
864 void llist_add_to_end(llist_t **list_head, void *data) FAST_FUNC;
865 void *llist_pop(llist_t **elm) FAST_FUNC;
866 void llist_unlink(llist_t **head, llist_t *elm) FAST_FUNC;
867 void llist_free(llist_t *elm, void (*freeit)(void *data)) FAST_FUNC;
868 llist_t *llist_rev(llist_t *list) FAST_FUNC;
869 llist_t *llist_find_str(llist_t *first, const char *str) FAST_FUNC;
870 /* BTW, surprisingly, changing API to
871 * llist_t *llist_add_to(llist_t *old_head, void *data)
872 * etc does not result in smaller code... */
874 /* start_stop_daemon and udhcpc are special - they want
875 * to create pidfiles regardless of FEATURE_PIDFILE */
876 #if ENABLE_FEATURE_PIDFILE || defined(WANT_PIDFILE)
877 /* True only if we created pidfile which is *file*, not /dev/null etc */
878 extern smallint wrote_pidfile;
879 void write_pidfile(const char *path) FAST_FUNC;
880 #define remove_pidfile(path) do { if (wrote_pidfile) unlink(path); } while (0)
882 enum { wrote_pidfile = 0 };
883 #define write_pidfile(path) ((void)0)
884 #define remove_pidfile(path) ((void)0)
889 LOGMODE_STDIO = (1 << 0),
890 LOGMODE_SYSLOG = (1 << 1) * ENABLE_FEATURE_SYSLOG,
891 LOGMODE_BOTH = LOGMODE_SYSLOG + LOGMODE_STDIO,
893 extern const char *msg_eol;
894 extern smallint logmode;
895 extern int die_sleep;
896 extern int xfunc_error_retval;
897 extern jmp_buf die_jmp;
898 extern void xfunc_die(void) NORETURN FAST_FUNC;
899 extern void bb_show_usage(void) NORETURN FAST_FUNC;
900 extern void bb_error_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
901 extern void bb_error_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2))) FAST_FUNC;
902 extern void bb_perror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
903 extern void bb_simple_perror_msg(const char *s) FAST_FUNC;
904 extern void bb_perror_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2))) FAST_FUNC;
905 extern void bb_simple_perror_msg_and_die(const char *s) NORETURN FAST_FUNC;
906 extern void bb_herror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
907 extern void bb_herror_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2))) FAST_FUNC;
908 extern void bb_perror_nomsg_and_die(void) NORETURN FAST_FUNC;
909 extern void bb_perror_nomsg(void) FAST_FUNC;
910 extern void bb_info_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2))) FAST_FUNC;
911 extern void bb_verror_msg(const char *s, va_list p, const char *strerr) FAST_FUNC;
913 /* We need to export XXX_main from libbusybox
914 * only if we build "individual" binaries
916 #if ENABLE_FEATURE_INDIVIDUAL
917 #define MAIN_EXTERNALLY_VISIBLE EXTERNALLY_VISIBLE
919 #define MAIN_EXTERNALLY_VISIBLE
923 /* Applets which are useful from another applets */
924 int bb_cat(char** argv);
925 /* If shell needs them, they exist even if not enabled as applets */
926 int echo_main(int argc, char** argv) IF_ECHO(MAIN_EXTERNALLY_VISIBLE);
927 int printf_main(int argc, char **argv) IF_PRINTF(MAIN_EXTERNALLY_VISIBLE);
928 int test_main(int argc, char **argv) IF_TEST(MAIN_EXTERNALLY_VISIBLE);
929 int kill_main(int argc, char **argv) IF_KILL(MAIN_EXTERNALLY_VISIBLE);
930 /* Similar, but used by chgrp, not shell */
931 int chown_main(int argc, char **argv) IF_CHOWN(MAIN_EXTERNALLY_VISIBLE);
933 int ls_main(int argc, char **argv) IF_LS(MAIN_EXTERNALLY_VISIBLE);
934 /* Don't need IF_xxx() guard for these */
935 int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
936 int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
939 void bb_displayroutes(int noresolve, int netstatfmt) FAST_FUNC;
944 int create_icmp_socket(void) FAST_FUNC;
945 int create_icmp6_socket(void) FAST_FUNC;
947 /* This structure defines protocol families and their handlers. */
953 char* FAST_FUNC (*print)(unsigned char *);
954 const char* FAST_FUNC (*sprint)(struct sockaddr *, int numeric);
955 int FAST_FUNC (*input)(/*int type,*/ const char *bufp, struct sockaddr *);
956 void FAST_FUNC (*herror)(char *text);
957 int FAST_FUNC (*rprint)(int options);
958 int FAST_FUNC (*rinput)(int typ, int ext, char **argv);
960 int FAST_FUNC (*getmask)(char *src, struct sockaddr *mask, char *name);
962 /* This structure defines hardware protocols and their handlers. */
968 char* FAST_FUNC (*print)(unsigned char *);
969 int FAST_FUNC (*input)(const char *, struct sockaddr *);
970 int FAST_FUNC (*activate)(int fd);
971 int suppress_null_addr;
973 extern smallint interface_opt_a;
974 int display_interfaces(char *ifname) FAST_FUNC;
975 #if ENABLE_FEATURE_HWIB
976 int in_ib(const char *bufp, struct sockaddr *sap) FAST_FUNC;
978 #define in_ib(a, b) 1 /* fail */
980 const struct aftype *get_aftype(const char *name) FAST_FUNC;
981 const struct hwtype *get_hwtype(const char *name) FAST_FUNC;
982 const struct hwtype *get_hwntype(int type) FAST_FUNC;
985 #ifndef BUILD_INDIVIDUAL
986 extern int find_applet_by_name(const char *name) FAST_FUNC;
987 /* Returns only if applet is not found. */
988 extern void run_applet_and_exit(const char *name, char **argv) FAST_FUNC;
989 extern void run_applet_no_and_exit(int a, char **argv) NORETURN FAST_FUNC;
993 extern int match_fstype(const struct mntent *mt, const char *fstypes) FAST_FUNC;
994 extern struct mntent *find_mount_point(const char *name) FAST_FUNC;
996 extern void erase_mtab(const char * name) FAST_FUNC;
997 extern unsigned int tty_baud_to_value(speed_t speed) FAST_FUNC;
998 extern speed_t tty_value_to_baud(unsigned int value) FAST_FUNC;
999 extern void bb_warn_ignoring_args(int n) FAST_FUNC;
1001 extern int get_linux_version_code(void) FAST_FUNC;
1003 extern char *query_loop(const char *device) FAST_FUNC;
1004 extern int del_loop(const char *device) FAST_FUNC;
1005 /* If *devname is not NULL, use that name, otherwise try to find free one,
1006 * malloc and return it in *devname.
1007 * return value: 1: read-only loopdev was setup, 0: rw, < 0: error */
1008 extern int set_loop(char **devname, const char *file, unsigned long long offset) FAST_FUNC;
1010 /* Like bb_ask below, but asks on stdin with no timeout. */
1011 char *bb_ask_stdin(const char * prompt) FAST_FUNC;
1012 //TODO: pass buf pointer or return allocated buf (avoid statics)?
1013 char *bb_ask(const int fd, int timeout, const char * prompt) FAST_FUNC;
1014 int bb_ask_confirmation(void) FAST_FUNC;
1016 int bb_parse_mode(const char* s, mode_t* theMode) FAST_FUNC;
1019 * Config file parser
1022 PARSE_COLLAPSE = 0x00010000, // treat consecutive delimiters as one
1023 PARSE_TRIM = 0x00020000, // trim leading and trailing delimiters
1024 // TODO: COLLAPSE and TRIM seem to always go in pair
1025 PARSE_GREEDY = 0x00040000, // last token takes entire remainder of the line
1026 PARSE_MIN_DIE = 0x00100000, // die if < min tokens found
1027 // keep a copy of current line
1028 PARSE_KEEP_COPY = 0x00200000 * ENABLE_FEATURE_CROND_D,
1029 // PARSE_ESCAPE = 0x00400000, // process escape sequences in tokens
1031 // * remove leading and trailing delimiters and collapse
1032 // multiple delimiters into one
1033 // * warn and continue if less than mintokens delimiters found
1034 // * grab everything into last token
1035 PARSE_NORMAL = PARSE_COLLAPSE | PARSE_TRIM | PARSE_GREEDY,
1037 typedef struct parser_t {
1043 parser_t* config_open(const char *filename) FAST_FUNC;
1044 parser_t* config_open2(const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *path)) FAST_FUNC;
1045 int config_read(parser_t *parser, char **tokens, unsigned flags, const char *delims) FAST_FUNC;
1046 #define config_read(parser, tokens, max, min, str, flags) \
1047 config_read(parser, tokens, ((flags) | (((min) & 0xFF) << 8) | ((max) & 0xFF)), str)
1048 void config_close(parser_t *parser) FAST_FUNC;
1050 /* Concatenate path and filename to new allocated buffer.
1051 * Add "/" only as needed (no duplicate "//" are produced).
1052 * If path is NULL, it is assumed to be "/".
1053 * filename should not be NULL. */
1054 char *concat_path_file(const char *path, const char *filename) FAST_FUNC;
1055 char *concat_subpath_file(const char *path, const char *filename) FAST_FUNC;
1056 const char *bb_basename(const char *name) FAST_FUNC;
1057 /* NB: can violate const-ness (similarly to strchr) */
1058 char *last_char_is(const char *s, int c) FAST_FUNC;
1061 int bb_make_directory(char *path, long mode, int flags) FAST_FUNC;
1063 int get_signum(const char *name) FAST_FUNC;
1064 const char *get_signame(int number) FAST_FUNC;
1065 void print_signames(void) FAST_FUNC;
1067 char *bb_simplify_path(const char *path) FAST_FUNC;
1068 /* Returns ptr to NUL */
1069 char *bb_simplify_abs_path_inplace(char *path) FAST_FUNC;
1071 #define FAIL_DELAY 3
1072 extern void bb_do_delay(int seconds) FAST_FUNC;
1073 extern void change_identity(const struct passwd *pw) FAST_FUNC;
1074 extern void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args) NORETURN FAST_FUNC;
1075 extern void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args) FAST_FUNC;
1077 extern void renew_current_security_context(void) FAST_FUNC;
1078 extern void set_current_security_context(security_context_t sid) FAST_FUNC;
1079 extern context_t set_security_context_component(security_context_t cur_context,
1080 char *user, char *role, char *type, char *range) FAST_FUNC;
1081 extern void setfscreatecon_or_die(security_context_t scontext) FAST_FUNC;
1082 extern void selinux_preserve_fcontext(int fdesc) FAST_FUNC;
1084 #define selinux_preserve_fcontext(fdesc) ((void)0)
1086 extern void selinux_or_die(void) FAST_FUNC;
1087 extern int restricted_shell(const char *shell) FAST_FUNC;
1089 /* setup_environment:
1090 * if clear_env = 1: cd(pw->pw_dir), clear environment, then set
1092 * USER=pw->pw_name, LOGNAME=pw->pw_name
1093 * PATH=bb_default_[root_]path
1096 * else if change_env = 1:
1097 * if not root (if pw->pw_uid != 0):
1098 * USER=pw->pw_name, LOGNAME=pw->pw_name
1103 extern void setup_environment(const char *shell, int clear_env, int change_env, const struct passwd *pw) FAST_FUNC;
1104 extern int correct_password(const struct passwd *pw) FAST_FUNC;
1105 /* Returns a malloced string */
1106 #if !ENABLE_USE_BB_CRYPT
1107 #define pw_encrypt(clear, salt, cleanup) pw_encrypt(clear, salt)
1109 extern char *pw_encrypt(const char *clear, const char *salt, int cleanup) FAST_FUNC;
1110 extern int obscure(const char *old, const char *newval, const struct passwd *pwdp) FAST_FUNC;
1111 /* rnd is additional random input. New one is returned.
1112 * Useful if you call crypt_make_salt many times in a row:
1113 * rnd = crypt_make_salt(buf1, 4, 0);
1114 * rnd = crypt_make_salt(buf2, 4, rnd);
1115 * rnd = crypt_make_salt(buf3, 4, rnd);
1116 * (otherwise we risk having same salt generated)
1118 extern int crypt_make_salt(char *p, int cnt, int rnd) FAST_FUNC;
1120 /* Returns number of lines changed, or -1 on error */
1121 #if !(ENABLE_FEATURE_ADDUSER_TO_GROUP || ENABLE_FEATURE_DEL_USER_FROM_GROUP)
1122 #define update_passwd(filename, username, data, member) \
1123 update_passwd(filename, username, data)
1125 extern int update_passwd(const char *filename,
1126 const char *username,
1128 const char *member) FAST_FUNC;
1130 int index_in_str_array(const char *const string_array[], const char *key) FAST_FUNC;
1131 int index_in_strings(const char *strings, const char *key) FAST_FUNC;
1132 int index_in_substr_array(const char *const string_array[], const char *key) FAST_FUNC;
1133 int index_in_substrings(const char *strings, const char *key) FAST_FUNC;
1134 const char *nth_string(const char *strings, int n) FAST_FUNC;
1136 extern void print_login_issue(const char *issue_file, const char *tty) FAST_FUNC;
1137 extern void print_login_prompt(void) FAST_FUNC;
1139 char *xmalloc_ttyname(int fd) FAST_FUNC;
1140 /* NB: typically you want to pass fd 0, not 1. Think 'applet | grep something' */
1141 int get_terminal_width_height(int fd, unsigned *width, unsigned *height) FAST_FUNC;
1143 int tcsetattr_stdin_TCSANOW(const struct termios *tp) FAST_FUNC;
1145 /* NB: "unsigned request" is crucial! "int request" will break some arches! */
1146 int ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5))) FAST_FUNC;
1147 int ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5))) FAST_FUNC;
1148 #if ENABLE_IOCTL_HEX2STR_ERROR
1149 int bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name) FAST_FUNC;
1150 int bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name) FAST_FUNC;
1151 #define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp,#request)
1152 #define xioctl(fd,request,argp) bb_xioctl(fd,request,argp,#request)
1154 int bb_ioctl_or_warn(int fd, unsigned request, void *argp) FAST_FUNC;
1155 int bb_xioctl(int fd, unsigned request, void *argp) FAST_FUNC;
1156 #define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp)
1157 #define xioctl(fd,request,argp) bb_xioctl(fd,request,argp)
1160 char *is_in_ino_dev_hashtable(const struct stat *statbuf) FAST_FUNC;
1161 void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name) FAST_FUNC;
1162 void reset_ino_dev_hashtable(void) FAST_FUNC;
1164 /* At least glibc has horrendously large inline for this, so wrap it */
1165 unsigned long long bb_makedev(unsigned int major, unsigned int minor) FAST_FUNC;
1167 #define makedev(a,b) bb_makedev(a,b)
1171 /* "Keycodes" that report an escape sequence.
1172 * We use something which fits into signed char,
1173 * yet doesn't represent any valid Unicode characher.
1174 * Also, -1 is reserved for error indication and we don't use it. */
1182 KEYCODE_INSERT = -8,
1183 KEYCODE_DELETE = -9,
1184 KEYCODE_PAGEUP = -10,
1185 KEYCODE_PAGEDOWN = -11,
1196 KEYCODE_FUN10 = -21,
1197 KEYCODE_FUN11 = -22,
1198 KEYCODE_FUN12 = -23,
1200 KEYCODE_CURSOR_POS = -0x100,
1201 /* How long is the longest ESC sequence we know?
1202 * We want it big enough to be able to contain
1203 * cursor position sequence "ESC [ 9999 ; 9999 R"
1205 KEYCODE_BUFFER_SIZE = 16
1207 /* Note: fd may be in blocking or non-blocking mode, both make sense.
1208 * For one, less uses non-blocking mode.
1209 * Only the first read syscall inside read_key may block indefinitely
1210 * (unless fd is in non-blocking mode),
1211 * subsequent reads will time out after a few milliseconds.
1212 * Return of -1 means EOF or error (errno == 0 on EOF).
1213 * buffer[0] is used as a counter of buffered chars and must be 0
1216 int64_t read_key(int fd, char *buffer) FAST_FUNC;
1219 #if ENABLE_FEATURE_EDITING
1220 /* It's NOT just ENABLEd or disabled. It's a number: */
1221 # ifdef CONFIG_FEATURE_EDITING_HISTORY
1222 # define MAX_HISTORY (CONFIG_FEATURE_EDITING_HISTORY + 0)
1224 # define MAX_HISTORY 0
1226 typedef struct line_input_t {
1228 const char *path_lookup;
1232 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1233 unsigned cnt_history_in_file;
1234 const char *hist_file;
1236 char *history[MAX_HISTORY + 1];
1240 DO_HISTORY = 1 * (MAX_HISTORY > 0),
1241 SAVE_HISTORY = 2 * (MAX_HISTORY > 0) * ENABLE_FEATURE_EDITING_SAVEHISTORY,
1242 TAB_COMPLETION = 4 * ENABLE_FEATURE_TAB_COMPLETION,
1243 USERNAME_COMPLETION = 8 * ENABLE_FEATURE_USERNAME_COMPLETION,
1244 VI_MODE = 0x10 * ENABLE_FEATURE_EDITING_VI,
1245 WITH_PATH_LOOKUP = 0x20,
1246 FOR_SHELL = DO_HISTORY | SAVE_HISTORY | TAB_COMPLETION | USERNAME_COMPLETION,
1248 line_input_t *new_line_input_t(int flags) FAST_FUNC;
1249 /* so far static: void free_line_input_t(line_input_t *n) FAST_FUNC; */
1251 * -1 on read errors or EOF, or on bare Ctrl-D,
1252 * 0 on ctrl-C (the line entered is still returned in 'command'),
1253 * >0 length of input string, including terminating '\n'
1255 int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *state) FAST_FUNC;
1257 int read_line_input(const char* prompt, char* command, int maxsize) FAST_FUNC;
1258 #define read_line_input(prompt, command, maxsize, state) \
1259 read_line_input(prompt, command, maxsize)
1264 # ifdef TASK_COMM_LEN
1265 enum { COMM_LEN = TASK_COMM_LEN };
1267 /* synchronize with sizeof(task_struct.comm) in /usr/include/linux/sched.h */
1268 enum { COMM_LEN = 16 };
1271 typedef struct procps_status_t {
1273 uint8_t shift_pages_to_bytes;
1274 uint8_t shift_pages_to_kb;
1275 /* Fields are set to 0/NULL if failed to determine (or not requested) */
1278 IF_SELINUX(char *context;)
1279 /* Everything below must contain no ptrs to malloc'ed data:
1280 * it is memset(0) for each process in procps_scan() */
1281 unsigned long vsz, rss; /* we round it to kbytes */
1282 unsigned long stime, utime;
1283 unsigned long start_time;
1290 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
1295 unsigned tty_major,tty_minor;
1296 #if ENABLE_FEATURE_TOPMEM
1297 unsigned long mapped_rw;
1298 unsigned long mapped_ro;
1299 unsigned long shared_clean;
1300 unsigned long shared_dirty;
1301 unsigned long private_clean;
1302 unsigned long private_dirty;
1303 unsigned long stack;
1306 /* basename of executable in exec(2), read from /proc/N/stat
1307 * (if executable is symlink or script, it is NOT replaced
1308 * by link target or interpreter name) */
1309 char comm[COMM_LEN];
1310 /* user/group? - use passwd/group parsing functions */
1311 #if ENABLE_FEATURE_TOP_SMP_PROCESS
1312 int last_seen_on_cpu;
1315 /* flag bits for procps_scan(xx, flags) calls */
1317 PSSCAN_PID = 1 << 0,
1318 PSSCAN_PPID = 1 << 1,
1319 PSSCAN_PGID = 1 << 2,
1320 PSSCAN_SID = 1 << 3,
1321 PSSCAN_UIDGID = 1 << 4,
1322 PSSCAN_COMM = 1 << 5,
1323 /* PSSCAN_CMD = 1 << 6, - use read_cmdline instead */
1324 PSSCAN_ARGV0 = 1 << 7,
1325 /* PSSCAN_EXE = 1 << 8, - not implemented */
1326 PSSCAN_STATE = 1 << 9,
1327 PSSCAN_VSZ = 1 << 10,
1328 PSSCAN_RSS = 1 << 11,
1329 PSSCAN_STIME = 1 << 12,
1330 PSSCAN_UTIME = 1 << 13,
1331 PSSCAN_TTY = 1 << 14,
1332 PSSCAN_SMAPS = (1 << 15) * ENABLE_FEATURE_TOPMEM,
1333 /* NB: used by find_pid_by_name(). Any applet using it
1334 * needs to be mentioned here. */
1335 PSSCAN_ARGVN = (1 << 16) * (ENABLE_KILLALL
1336 || ENABLE_PGREP || ENABLE_PKILL
1340 IF_SELINUX(PSSCAN_CONTEXT = 1 << 17,)
1341 PSSCAN_START_TIME = 1 << 18,
1342 PSSCAN_CPU = (1 << 19) * ENABLE_FEATURE_TOP_SMP_PROCESS,
1343 PSSCAN_NICE = (1 << 20) * ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS,
1344 PSSCAN_RUIDGID = (1 << 21) * ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS,
1345 /* These are all retrieved from proc/NN/stat in one go: */
1346 PSSCAN_STAT = PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
1347 /**/ | PSSCAN_COMM | PSSCAN_STATE
1348 /**/ | PSSCAN_VSZ | PSSCAN_RSS
1349 /**/ | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_START_TIME
1350 /**/ | PSSCAN_TTY | PSSCAN_NICE
1353 //procps_status_t* alloc_procps_scan(void) FAST_FUNC;
1354 void free_procps_scan(procps_status_t* sp) FAST_FUNC;
1355 procps_status_t* procps_scan(procps_status_t* sp, int flags) FAST_FUNC;
1356 /* Format cmdline (up to col chars) into char buf[col+1] */
1357 /* Puts [comm] if cmdline is empty (-> process is a kernel thread) */
1358 void read_cmdline(char *buf, int col, unsigned pid, const char *comm) FAST_FUNC;
1359 pid_t *find_pid_by_name(const char* procName) FAST_FUNC;
1360 pid_t *pidlist_reverse(pid_t *pidList) FAST_FUNC;
1363 extern const char bb_uuenc_tbl_base64[];
1364 extern const char bb_uuenc_tbl_std[];
1365 void bb_uuencode(char *store, const void *s, int length, const char *tbl) FAST_FUNC;
1367 typedef struct sha1_ctx_t {
1368 uint32_t hash[8]; /* 5, +3 elements for sha256 */
1370 uint8_t wbuffer[64]; /* NB: always correctly aligned for uint64_t */
1371 void (*process_block)(struct sha1_ctx_t*) FAST_FUNC;
1373 void sha1_begin(sha1_ctx_t *ctx) FAST_FUNC;
1374 void sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx) FAST_FUNC;
1375 void sha1_end(void *resbuf, sha1_ctx_t *ctx) FAST_FUNC;
1376 typedef struct sha1_ctx_t sha256_ctx_t;
1377 void sha256_begin(sha256_ctx_t *ctx) FAST_FUNC;
1378 #define sha256_hash sha1_hash
1379 #define sha256_end sha1_end
1380 typedef struct sha512_ctx_t {
1382 uint64_t total64[2];
1383 uint8_t wbuffer[128]; /* NB: always correctly aligned for uint64_t */
1385 void sha512_begin(sha512_ctx_t *ctx) FAST_FUNC;
1386 void sha512_hash(const void *buffer, size_t len, sha512_ctx_t *ctx) FAST_FUNC;
1387 void sha512_end(void *resbuf, sha512_ctx_t *ctx) FAST_FUNC;
1389 typedef struct md5_ctx_t {
1399 /* libbb/md5prime.c uses a bit different one: */
1400 typedef struct md5_ctx_t {
1401 uint32_t state[4]; /* state (ABCD) */
1402 uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */
1403 unsigned char buffer[64]; /* input buffer */
1406 void md5_begin(md5_ctx_t *ctx) FAST_FUNC;
1407 void md5_hash(const void *data, size_t length, md5_ctx_t *ctx) FAST_FUNC;
1408 void md5_end(void *resbuf, md5_ctx_t *ctx) FAST_FUNC;
1411 uint32_t *crc32_filltable(uint32_t *tbl256, int endian) FAST_FUNC;
1413 typedef struct masks_labels_t {
1417 int print_flags_separated(const int *masks, const char *labels,
1418 int flags, const char *separator) FAST_FUNC;
1419 int print_flags(const masks_labels_t *ml, int flags) FAST_FUNC;
1422 extern const char *applet_name;
1423 /* "BusyBox vN.N.N (timestamp or extra_version)" */
1424 extern const char bb_banner[];
1425 extern const char bb_msg_memory_exhausted[];
1426 extern const char bb_msg_invalid_date[];
1427 extern const char bb_msg_read_error[];
1428 extern const char bb_msg_write_error[];
1429 extern const char bb_msg_unknown[];
1430 extern const char bb_msg_can_not_create_raw_socket[];
1431 extern const char bb_msg_perm_denied_are_you_root[];
1432 extern const char bb_msg_requires_arg[];
1433 extern const char bb_msg_invalid_arg[];
1434 extern const char bb_msg_standard_input[];
1435 extern const char bb_msg_standard_output[];
1437 extern const char bb_str_default[];
1438 /* NB: (bb_hexdigits_upcase[i] | 0x20) -> lowercase hex digit */
1439 extern const char bb_hexdigits_upcase[];
1441 extern const char bb_path_mtab_file[];
1442 extern const char bb_path_passwd_file[];
1443 extern const char bb_path_shadow_file[];
1444 extern const char bb_path_gshadow_file[];
1445 extern const char bb_path_group_file[];
1446 extern const char bb_path_motd_file[];
1447 extern const char bb_path_wtmp_file[];
1448 extern const char bb_dev_null[];
1449 extern const char bb_busybox_exec_path[];
1450 /* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
1451 * but I want to save a few bytes here */
1452 extern const char bb_PATH_root_path[]; /* "PATH=/sbin:/usr/sbin:/bin:/usr/bin" */
1453 #define bb_default_root_path (bb_PATH_root_path + sizeof("PATH"))
1454 #define bb_default_path (bb_PATH_root_path + sizeof("PATH=/sbin:/usr/sbin"))
1456 extern const int const_int_0;
1457 extern const int const_int_1;
1463 /* Providing hard guarantee on minimum size (think of BUFSIZ == 128) */
1464 enum { COMMON_BUFSIZE = (BUFSIZ >= 256*sizeof(void*) ? BUFSIZ+1 : 256*sizeof(void*)) };
1465 extern char bb_common_bufsiz1[COMMON_BUFSIZE];
1466 /* This struct is deliberately not defined. */
1467 /* See docs/keep_data_small.txt */
1469 /* '*const' ptr makes gcc optimize code much better.
1470 * Magic prevents ptr_to_globals from going into rodata.
1471 * If you want to assign a value, use SET_PTR_TO_GLOBALS(x) */
1472 extern struct globals *const ptr_to_globals;
1473 /* At least gcc 3.4.6 on mipsel system needs optimization barrier */
1474 #define barrier() __asm__ __volatile__("":::"memory")
1475 #define SET_PTR_TO_GLOBALS(x) do { \
1476 (*(struct globals**)&ptr_to_globals) = (x); \
1480 /* You can change LIBBB_DEFAULT_LOGIN_SHELL, but don't use it,
1481 * use bb_default_login_shell and following defines.
1482 * If you change LIBBB_DEFAULT_LOGIN_SHELL,
1483 * don't forget to change increment constant. */
1484 #define LIBBB_DEFAULT_LOGIN_SHELL "-/bin/sh"
1485 extern const char bb_default_login_shell[];
1487 #define DEFAULT_SHELL (bb_default_login_shell+1)
1489 #define DEFAULT_SHELL_SHORT_NAME (bb_default_login_shell+6)
1491 #if ENABLE_FEATURE_DEVFS
1492 # define CURRENT_VC "/dev/vc/0"
1493 # define VC_1 "/dev/vc/1"
1494 # define VC_2 "/dev/vc/2"
1495 # define VC_3 "/dev/vc/3"
1496 # define VC_4 "/dev/vc/4"
1497 # define VC_5 "/dev/vc/5"
1498 #if defined(__sh__) || defined(__H8300H__) || defined(__H8300S__)
1499 /* Yes, this sucks, but both SH (including sh64) and H8 have a SCI(F) for their
1500 respective serial ports .. as such, we can't use the common device paths for
1502 # define SC_0 "/dev/ttsc/0"
1503 # define SC_1 "/dev/ttsc/1"
1504 # define SC_FORMAT "/dev/ttsc/%d"
1506 # define SC_0 "/dev/tts/0"
1507 # define SC_1 "/dev/tts/1"
1508 # define SC_FORMAT "/dev/tts/%d"
1510 # define VC_FORMAT "/dev/vc/%d"
1511 # define LOOP_FORMAT "/dev/loop/%d"
1512 # define LOOP_NAMESIZE (sizeof("/dev/loop/") + sizeof(int)*3 + 1)
1513 # define LOOP_NAME "/dev/loop/"
1514 # define FB_0 "/dev/fb/0"
1516 # define CURRENT_VC "/dev/tty0"
1517 # define VC_1 "/dev/tty1"
1518 # define VC_2 "/dev/tty2"
1519 # define VC_3 "/dev/tty3"
1520 # define VC_4 "/dev/tty4"
1521 # define VC_5 "/dev/tty5"
1522 #if defined(__sh__) || defined(__H8300H__) || defined(__H8300S__)
1523 # define SC_0 "/dev/ttySC0"
1524 # define SC_1 "/dev/ttySC1"
1525 # define SC_FORMAT "/dev/ttySC%d"
1527 # define SC_0 "/dev/ttyS0"
1528 # define SC_1 "/dev/ttyS1"
1529 # define SC_FORMAT "/dev/ttyS%d"
1531 # define VC_FORMAT "/dev/tty%d"
1532 # define LOOP_FORMAT "/dev/loop%d"
1533 # define LOOP_NAMESIZE (sizeof("/dev/loop") + sizeof(int)*3 + 1)
1534 # define LOOP_NAME "/dev/loop"
1535 # define FB_0 "/dev/fb0"
1538 /* The following devices are the same on devfs and non-devfs systems. */
1539 #define CURRENT_TTY "/dev/tty"
1540 #define DEV_CONSOLE "/dev/console"
1543 #ifndef RB_POWER_OFF
1544 /* Stop system and switch power off if possible. */
1545 #define RB_POWER_OFF 0x4321fedc
1548 /* Make sure we call functions instead of macros. */
1562 /* This one is more efficient - we save ~400 bytes */
1564 #define isdigit(a) ((unsigned)((a) - '0') <= 9)
1566 #define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))
1569 POP_SAVED_FUNCTION_VISIBILITY