blob: 2b928215fbd7f5ebd5ca9b8ea777347e655f9048 [file] [log] [blame]
/* vi: set sw=4 ts=4: */
* Busybox main internal header file
* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
* Permission has been granted to redistribute this code under the GPL.
* Licensed under the GPL version 2, see the file LICENSE in this tarball.
#ifndef __LIBBUSYBOX_H__
#define __LIBBUSYBOX_H__ 1
#include "platform.h"
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <mntent.h>
#include <netdb.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include <sys/poll.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
/* Try to pull in PATH_MAX */
#include <limits.h>
#include <sys/param.h>
#ifndef PATH_MAX
#define PATH_MAX 256
#include <selinux/selinux.h>
#include <selinux/context.h>
#include <selinux/flask.h>
#include <selinux/av_permissions.h>
#include <locale.h>
#define setlocale(x,y) ((void)0)
#include "pwd_.h"
#include "grp_.h"
/* ifdef it out, because it may include <shadow.h> */
/* and we may not even _have_ <shadow.h>! */
#include "shadow_.h"
#if defined(__GLIBC__) && __GLIBC__ < 2
int vdprintf(int d, const char *format, va_list ap);
/* klogctl is in libc's klog.h, but we cheat and not #include that */
int klogctl(int type, char *b, int len);
/* This is declared here rather than #including <libgen.h> in order to avoid
* confusing the two versions of basename. See the dirname/basename man page
* for details. */
char *dirname(char *path);
/* Include our own copy of struct sysinfo to avoid binary compatibility
* problems with Linux 2.4, which changed things. Grumble, grumble. */
struct sysinfo {
long uptime; /* Seconds since boot */
unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
unsigned long totalram; /* Total usable main memory size */
unsigned long freeram; /* Available memory size */
unsigned long sharedram; /* Amount of shared memory */
unsigned long bufferram; /* Memory used by buffers */
unsigned long totalswap; /* Total swap space size */
unsigned long freeswap; /* swap space still available */
unsigned short procs; /* Number of current processes */
unsigned short pad; /* Padding needed for m68k */
unsigned long totalhigh; /* Total high memory size */
unsigned long freehigh; /* Available high memory size */
unsigned int mem_unit; /* Memory unit size in bytes */
char _f[20 - 2*sizeof(long) - sizeof(int)]; /* Padding: libc5 uses this.. */
int sysinfo(struct sysinfo* info);
/* Tested to work correctly with all int types (IIRC :]) */
#define MAXINT(T) (T)( \
((T)-1) > 0 \
? (T)-1 \
: (T)~((T)1 << (sizeof(T)*8-1)) \
#define MININT(T) (T)( \
((T)-1) > 0 \
? (T)0 \
: ((T)1 << (sizeof(T)*8-1)) \
/* Large file support */
/* Note that CONFIG_LFS=y forces bbox to be built with all common ops
* (stat, lseek etc) mapped to "largefile" variants by libc.
* Practically it means that open() automatically has O_LARGEFILE added
* and all filesize/file_offset parameters and struct members are "large"
* (in today's world - signed 64bit). For full support of large files,
* we need a few helper #defines (below) and careful use of off_t
* instead of int/ssize_t. No lseek64(), O_LARGEFILE etc necessary */
/* CONFIG_LFS is on */
# if ULONG_MAX > 0xffffffff
/* "long" is long enough on this system */
# define XATOOFF(a) xatoul_range(a, 0, LONG_MAX)
/* usage: sz = BB_STRTOOFF(s, NULL, 10); if (errno || sz < 0) die(); */
# define BB_STRTOOFF bb_strtoul
# define STRTOOFF strtoul
/* usage: printf("size: %"OFF_FMT"d (%"OFF_FMT"x)\n", sz, sz); */
# define OFF_FMT "l"
# else
/* "long" is too short, need "long long" */
# define XATOOFF(a) xatoull_range(a, 0, LLONG_MAX)
# define BB_STRTOOFF bb_strtoull
# define STRTOOFF strtoull
# define OFF_FMT "ll"
# endif
/* CONFIG_LFS is off */
# if UINT_MAX == 0xffffffff
/* While sizeof(off_t) == sizeof(int), off_t is typedef'ed to long anyway.
* gcc will throw warnings on printf("%d", off_t). Crap... */
# define XATOOFF(a) xatoi_u(a)
# define BB_STRTOOFF bb_strtou
# define STRTOOFF strtol
# define OFF_FMT "l"
# else
# define XATOOFF(a) xatoul_range(a, 0, LONG_MAX)
# define BB_STRTOOFF bb_strtoul
# define STRTOOFF strtol
# define OFF_FMT "l"
# endif
/* scary. better ideas? (but do *test* them first!) */
#define OFF_T_MAX ((off_t)~((off_t)1 << (sizeof(off_t)*8-1)))
/* Some useful definitions */
#undef FALSE
#define FALSE ((int) 0)
#undef TRUE
#define TRUE ((int) 1)
#undef SKIP
#define SKIP ((int) 2)
/* for mtab.c */
#define MTAB_GETDEVICE '2'
#define BUF_SIZE 8192
#define EXPAND_ALLOC 1024
/* Macros for min/max. */
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#ifndef MAX
#define MAX(a,b) (((a)>(b))?(a):(b))
/* buffer allocation schemes */
#define RESERVE_CONFIG_BUFFER(buffer,len) char buffer[len]
#define RESERVE_CONFIG_UBUFFER(buffer,len) unsigned char buffer[len]
#define RELEASE_CONFIG_BUFFER(buffer) ((void)0)
#define RESERVE_CONFIG_BUFFER(buffer,len) static char buffer[len]
#define RESERVE_CONFIG_UBUFFER(buffer,len) static unsigned char buffer[len]
#define RELEASE_CONFIG_BUFFER(buffer) ((void)0)
#define RESERVE_CONFIG_BUFFER(buffer,len) char *buffer = xmalloc(len)
#define RESERVE_CONFIG_UBUFFER(buffer,len) unsigned char *buffer = xmalloc(len)
#define RELEASE_CONFIG_BUFFER(buffer) free(buffer)
#if defined(__GLIBC__)
/* glibc uses __errno_location() to get a ptr to errno */
/* We can just memorize it once - no multithreading in busybox :) */
extern int *const bb_errno;
#undef errno
#define errno (*bb_errno)
unsigned long long monotonic_us(void);
unsigned monotonic_sec(void);
extern void chomp(char *s);
extern void trim(char *s);
extern char *skip_whitespace(const char *);
extern char *skip_non_whitespace(const char *);
//TODO: supply a pointer to char[11] buffer (avoid statics)?
extern const char *bb_mode_string(mode_t mode);
extern int is_directory(const char *name, int followLinks, struct stat *statBuf);
extern int remove_file(const char *path, int flags);
extern int copy_file(const char *source, const char *dest, int flags);
enum {
ACTION_RECURSE = (1 << 0),
/*ACTION_REVERSE = (1 << 4), - unused */
extern int recursive_action(const char *fileName, unsigned flags,
int (*fileAction) (const char *fileName, struct stat* statbuf, void* userData, int depth),
int (*dirAction) (const char *fileName, struct stat* statbuf, void* userData, int depth),
void* userData, unsigned depth);
extern int device_open(const char *device, int mode);
extern int get_console_fd(void);
extern char *find_block_device(const char *path);
/* bb_copyfd_XX print read/write errors and return -1 if they occur */
extern off_t bb_copyfd_eof(int fd1, int fd2);
extern off_t bb_copyfd_size(int fd1, int fd2, off_t size);
extern void bb_copyfd_exact_size(int fd1, int fd2, off_t size);
/* "short" copy can be detected by return value < size */
/* this helper yells "short read!" if param is not -1 */
extern void complain_copyfd_and_die(off_t sz) ATTRIBUTE_NORETURN;
extern char bb_process_escape_sequence(const char **ptr);
/* xxxx_strip version can modify its parameter:
* "/" -> "/"
* "abc" -> "abc"
* "abc/def" -> "def"
* "abc/def/" -> "def" !!
extern char *bb_get_last_path_component_strip(char *path);
/* "abc/def/" -> "" and it never modifies 'path' */
extern char *bb_get_last_path_component_nostrip(const char *path);
int ndelay_on(int fd);
int ndelay_off(int fd);
int close_on_exec_on(int fd);
void xdup2(int, int);
void xmove_fd(int, int);
DIR *xopendir(const char *path);
DIR *warn_opendir(const char *path);
/* UNUSED: char *xmalloc_realpath(const char *path); */
char *xmalloc_readlink(const char *path);
char *xmalloc_readlink_or_warn(const char *path);
char *xrealloc_getcwd_or_warn(char *cwd);
char *xmalloc_follow_symlinks(const char *path);
//TODO: signal(sid, f) is the same? then why?
extern void sig_catch(int,void (*)(int));
//#define sig_ignore(s) (sig_catch((s), SIG_IGN))
//#define sig_uncatch(s) (sig_catch((s), SIG_DFL))
extern void sig_block(int);
extern void sig_unblock(int);
/* UNUSED: extern void sig_blocknone(void); */
extern void sig_pause(void);
void xsetgid(gid_t gid);
void xsetuid(uid_t uid);
void xchdir(const char *path);
void xsetenv(const char *key, const char *value);
void xunlink(const char *pathname);
void xstat(const char *pathname, struct stat *buf);
int xopen(const char *pathname, int flags);
int xopen3(const char *pathname, int flags, int mode);
int open_or_warn(const char *pathname, int flags);
int open3_or_warn(const char *pathname, int flags, int mode);
void xpipe(int filedes[2]);
off_t xlseek(int fd, off_t offset, int whence);
off_t fdlength(int fd);
/* Useful for having small structure members/global variables */
typedef int8_t socktype_t;
typedef int8_t family_t;
struct BUG_too_small {
char BUG_socktype_t_too_small[(0
) <= 127 ? 1 : -1];
char BUG_family_t_too_small[(0
/* | AF_DECnet */
/* | AF_IPX */
) <= 127 ? 1 : -1];
int xsocket(int domain, int type, int protocol);
void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);
void xlisten(int s, int backlog);
void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen);
ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
socklen_t tolen);
/* SO_REUSEADDR allows a server to rebind to an address that is already
* "in use" by old connections to e.g. previous server instance which is
* killed or crashed. Without it bind will fail until all such connections
* time out. Linux does not allow multiple live binds on same ip:port
* regardless of SO_REUSEADDR (unlike some other flavors of Unix).
* Turn it on before you call bind(). */
void setsockopt_reuseaddr(int fd); /* On Linux this never fails. */
int setsockopt_broadcast(int fd);
/* NB: returns port in host byte order */
unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port);
typedef struct len_and_sockaddr {
socklen_t len;
union {
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
} len_and_sockaddr;
enum {
LSA_SIZEOF_SA = sizeof(
union {
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
/* Create stream socket, and allocate suitable lsa.
* (lsa of correct size and lsa->sa.sa_family (AF_INET/AF_INET6))
* af == AF_UNSPEC will result in trying to create IPv6 socket,
* and if kernel doesn't support it, IPv4.
int xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int af,) int sock_type);
int xsocket_stream(len_and_sockaddr **lsap);
/* Create server socket bound to bindaddr:port. bindaddr can be NULL,
* numeric IP ("N.N.N.N") or numeric IPv6 address,
* and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
* Only if there is no suffix, port argument is used */
/* NB: these set SO_REUSEADDR before bind */
int create_and_bind_stream_or_die(const char *bindaddr, int port);
int create_and_bind_dgram_or_die(const char *bindaddr, int port);
/* Create client TCP socket connected to peer:port. Peer cannot be NULL.
* Peer can be numeric IP ("N.N.N.N"), numeric IPv6 address or hostname,
* and can have ":PORT" suffix (for IPv6 use "[X:X:...:X]:PORT").
* If there is no suffix, port argument is used */
int create_and_connect_stream_or_die(const char *peer, int port);
/* Connect to peer identified by lsa */
int xconnect_stream(const len_and_sockaddr *lsa);
/* Return malloc'ed len_and_sockaddr with socket address of host:port
* Currently will return IPv4 or IPv6 sockaddrs only
* (depending on host), but in theory nothing prevents e.g.
* UNIX socket address being returned, IPX sockaddr etc...
* On error does bb_error_msg and returns NULL */
len_and_sockaddr* host2sockaddr(const char *host, int port);
/* Version which dies on error */
len_and_sockaddr* xhost2sockaddr(const char *host, int port);
len_and_sockaddr* xdotted2sockaddr(const char *host, int port);
/* Same, useful if you want to force family (e.g. IPv6) */
len_and_sockaddr* host_and_af2sockaddr(const char *host, int port, sa_family_t af);
len_and_sockaddr* xhost_and_af2sockaddr(const char *host, int port, sa_family_t af);
/* [we evaluate af: think about "host_and_af2sockaddr(..., af++)"] */
#define host_and_af2sockaddr(host, port, af) ((void)(af), host2sockaddr((host), (port)))
#define xhost_and_af2sockaddr(host, port, af) ((void)(af), xhost2sockaddr((host), (port)))
/* Assign sin[6]_port member if the socket is an AF_INET[6] one,
* otherwise no-op. Useful for ftp.
* NB: does NOT do htons() internally, just direct assignment. */
void set_nport(len_and_sockaddr *lsa, unsigned port);
/* Retrieve sin[6]_port or return -1 for non-INET[6] lsa's */
int get_nport(const struct sockaddr *sa);
/* Reverse DNS. Returns NULL on failure. */
char* xmalloc_sockaddr2host(const struct sockaddr *sa);
/* This one doesn't append :PORTNUM */
char* xmalloc_sockaddr2host_noport(const struct sockaddr *sa);
/* This one also doesn't fall back to dotted IP (returns NULL) */
char* xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa);
/* inet_[ap]ton on steroids */
char* xmalloc_sockaddr2dotted(const struct sockaddr *sa);
char* xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa);
// "old" (ipv4 only) API
// users: traceroute.c hostname.c - use _list_ of all IPs
struct hostent *xgethostbyname(const char *name);
// Also mount.c and inetd.c are using gethostbyname(),
// + inet_common.c has additional IPv4-only stuff
void socket_want_pktinfo(int fd);
ssize_t send_to_from(int fd, void *buf, size_t len, int flags,
const struct sockaddr *from, const struct sockaddr *to,
socklen_t tolen);
ssize_t recv_from_to(int fd, void *buf, size_t len, int flags,
struct sockaddr *from, struct sockaddr *to,
socklen_t sa_size);
char *xstrdup(const char *s);
char *xstrndup(const char *s, int n);
char *safe_strncpy(char *dst, const char *src, size_t size);
/* Guaranteed to NOT be a macro (smallest code). Saves nearly 2k on uclibc.
* But potentially slow, don't use in one-billion-times loops */
int bb_putchar(int ch);
char *xasprintf(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
// gcc-4.1.1 still isn't good enough at optimizing it
// (+200 bytes compared to macro)
//int LONE_DASH(const char *s) { return s[0] == '-' && !s[1]; }
//int NOT_LONE_DASH(const char *s) { return s[0] != '-' || s[1]; }
#define LONE_DASH(s) ((s)[0] == '-' && !(s)[1])
#define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1])
#define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
#define NOT_LONE_CHAR(s,c) ((s)[0] != (c) || (s)[1])
#define DOT_OR_DOTDOT(s) ((s)[0] == '.' && (!(s)[1] || ((s)[1] == '.' && !(s)[2])))
/* dmalloc will redefine these to it's own implementation. It is safe
* to have the prototypes here unconditionally. */
extern void *malloc_or_warn(size_t size);
extern void *xmalloc(size_t size);
extern void *xzalloc(size_t size);
extern void *xrealloc(void *old, size_t size);
extern ssize_t safe_read(int fd, void *buf, size_t count);
extern ssize_t full_read(int fd, void *buf, size_t count);
extern void xread(int fd, void *buf, size_t count);
extern unsigned char xread_char(int fd);
// Read one line a-la fgets. Uses one read(), works only on seekable streams
extern char *reads(int fd, char *buf, size_t count);
// Read one line a-la fgets. Reads byte-by-byte.
// Useful when it is important to not read ahead.
extern char *xmalloc_reads(int fd, char *pfx);
extern ssize_t read_close(int fd, void *buf, size_t count);
extern ssize_t open_read_close(const char *filename, void *buf, size_t count);
extern void *xmalloc_open_read_close(const char *filename, size_t *sizep);
extern ssize_t safe_write(int fd, const void *buf, size_t count);
extern ssize_t full_write(int fd, const void *buf, size_t count);
extern void xwrite(int fd, const void *buf, size_t count);
/* Reads and prints to stdout till eof, then closes FILE. Exits on error: */
extern void xprint_and_close_file(FILE *file);
extern char *xmalloc_fgets(FILE *file);
/* Read up to (and including) TERMINATING_STRING: */
extern char *xmalloc_fgets_str(FILE *file, const char *terminating_string);
/* Chops off '\n' from the end, unlike fgets: */
extern char *xmalloc_getline(FILE *file);
extern char *bb_get_chunk_from_file(FILE *file, int *end);
extern void die_if_ferror(FILE *file, const char *msg);
extern void die_if_ferror_stdout(void);
extern void xfflush_stdout(void);
extern void fflush_stdout_and_exit(int retval) ATTRIBUTE_NORETURN;
extern int fclose_if_not_stdin(FILE *file);
extern FILE *xfopen(const char *filename, const char *mode);
/* Prints warning to stderr and returns NULL on failure: */
extern FILE *fopen_or_warn(const char *filename, const char *mode);
/* "Opens" stdin if filename is special, else just opens file: */
extern FILE *fopen_or_warn_stdin(const char *filename);
/* Wrapper which restarts poll on EINTR or ENOMEM.
* On other errors complains [perror("poll")] and returns.
* Warning! May take (much) longer than timeout_ms to return!
* If this is a problem, use bare poll and open-code EINTR/ENOMEM handling */
int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout_ms);
/* Convert each alpha char in str to lower-case */
char* str_tolower(char *str);
char *utoa(unsigned n);
char *itoa(int n);
/* Returns a pointer past the formatted number, does NOT null-terminate */
char *utoa_to_buf(unsigned n, char *buf, unsigned buflen);
char *itoa_to_buf(int n, char *buf, unsigned buflen);
void smart_ulltoa5(unsigned long long ul, char buf[5]);
//TODO: provide pointer to buf (avoid statics)?
const char *make_human_readable_str(unsigned long long size,
unsigned long block_size, unsigned long display_unit);
/* Put a string of hex bytes ("1b2e66fe"...), return advanced pointer */
char *bin2hex(char *buf, const char *cp, int count);
/* Last element is marked by mult == 0 */
struct suffix_mult {
char suffix[4];
unsigned mult;
#include "xatonum.h"
/* Specialized: */
/* Using xatoi() instead of naive atoi() is not always convenient -
* in many places people want *non-negative* values, but store them
* in signed int. Therefore we need this one:
* dies if input is not in [0, INT_MAX] range. Also will reject '-0' etc */
int xatoi_u(const char *numstr);
/* Useful for reading port numbers */
uint16_t xatou16(const char *numstr);
/* These parse entries in /etc/passwd and /etc/group. This is desirable
* for BusyBox since we want to avoid using the glibc NSS stuff, which
* increases target size and is often not needed on embedded systems. */
long xuname2uid(const char *name);
long xgroup2gid(const char *name);
/* wrapper: allows string to contain numeric uid or gid */
unsigned long get_ug_id(const char *s, long (*xname2id)(const char *));
/* from chpst. Does not die, returns 0 on failure */
struct bb_uidgid_t {
uid_t uid;
gid_t gid;
/* always sets uid and gid */
int get_uidgid(struct bb_uidgid_t*, const char*, int numeric_ok);
/* chown-like handling of "user[:[group]" */
void parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group);
/* bb_getpwuid, bb_getgrgid:
* bb_getXXXid(buf, bufsz, id) - copy user/group name or id
* as a string to buf, return user/group name or NULL
* bb_getXXXid(NULL, 0, id) - return user/group name or NULL
* bb_getXXXid(NULL, -1, id) - return user/group name or exit
char *bb_getpwuid(char *name, int bufsize, long uid);
char *bb_getgrgid(char *group, int bufsize, long gid);
/* versions which cache results (useful for ps, ls etc) */
const char* get_cached_username(uid_t uid);
const char* get_cached_groupname(gid_t gid);
void clear_username_cache(void);
/* internally usernames are saved in fixed-sized char[] buffers */
enum { USERNAME_MAX_SIZE = 16 - sizeof(int) };
int execable_file(const char *name);
char *find_execable(const char *filename);
int exists_execable(const char *filename);
/* BB_EXECxx always execs (it's not doing NOFORK/NOEXEC stuff),
* but it may exec busybox and call applet instead of searching PATH.
int bb_execvp(const char *file, char *const argv[]);
#define BB_EXECVP(prog,cmd) bb_execvp(prog,cmd)
#define BB_EXECLP(prog,cmd,...) \
execlp((find_applet_by_name(prog) >= 0) ? CONFIG_BUSYBOX_EXEC_PATH : prog, \
cmd, __VA_ARGS__)
#define BB_EXECVP(prog,cmd) execvp(prog,cmd)
#define BB_EXECLP(prog,cmd,...) execlp(prog,cmd, __VA_ARGS__)
/* NOMMU friendy fork+exec */
pid_t spawn(char **argv);
pid_t xspawn(char **argv);
/* Unlike waitpid, waits ONLY for one process,
* It's safe to pass negative 'pids' from failed [v]fork -
* wait4pid will return -1 (and will not clobber [v]fork's errno).
* IOW: rc = wait4pid(spawn(argv));
* if (rc < 0) bb_perror_msg("%s", argv[0]);
* if (rc > 0) bb_error_msg("exit code: %d", rc);
int wait4pid(int pid);
int wait_pid(int *wstat, int pid);
int wait_nohang(int *wstat);
#define wait_crashed(w) ((w) & 127)
#define wait_exitcode(w) ((w) >> 8)
#define wait_stopsig(w) ((w) >> 8)
#define wait_stopped(w) (((w) & 127) == 127)
/* wait4pid(spawn(argv)) + NOFORK/NOEXEC (if configured) */
int spawn_and_wait(char **argv);
struct nofork_save_area {
jmp_buf die_jmp;
const char *applet_name;
int xfunc_error_retval;
uint32_t option_mask32;
int die_sleep;
smallint saved;
void save_nofork_data(struct nofork_save_area *save);
void restore_nofork_data(struct nofork_save_area *save);
/* Does NOT check that applet is NOFORK, just blindly runs it */
int run_nofork_applet(int applet_no, char **argv);
int run_nofork_applet_prime(struct nofork_save_area *old, int applet_no, char **argv);
/* Helpers for daemonization.
* bb_daemonize(flags) = daemonize, does not compile on NOMMU
* bb_daemonize_or_rexec(flags, argv) = daemonizes on MMU (and ignores argv),
* rexec's itself on NOMMU with argv passed as command line.
* Thus bb_daemonize_or_rexec may cause your <applet>_main() to be re-executed
* from the start. (It will detect it and not reexec again second time).
* You have to audit carefully that you don't do something twice as a result
* (opening files/sockets, parsing config files etc...)!
* Both of the above will redirect fd 0,1,2 to /dev/null and drop ctty
* (will do setsid()).
* forkexit_or_rexec(argv) = bare-bones "fork + parent exits" on MMU,
* "vfork + re-exec ourself" on NOMMU. No fd redirection, no setsid().
* Currently used for openvt. On MMU ignores argv.
* Helper for network daemons in foreground mode:
* bb_sanitize_stdio() = make sure that fd 0,1,2 are opened by opening them
* to /dev/null if they are not.
enum {
DAEMON_ONLY_SANITIZE = 8, /* internal use */
#if BB_MMU
void forkexit_or_rexec(void);
enum { re_execed = 0 };
# define forkexit_or_rexec(argv) forkexit_or_rexec()
# define bb_daemonize_or_rexec(flags, argv) bb_daemonize_or_rexec(flags)
# define bb_daemonize(flags) bb_daemonize_or_rexec(flags, bogus)
void re_exec(char **argv) ATTRIBUTE_NORETURN;
void forkexit_or_rexec(char **argv);
extern bool re_execed;
# define fork() BUG_fork_is_unavailable_on_nommu()
# define daemon(a,b) BUG_daemon_is_unavailable_on_nommu()
# define bb_daemonize(a) BUG_bb_daemonize_is_unavailable_on_nommu()
void bb_daemonize_or_rexec(int flags, char **argv);
void bb_sanitize_stdio(void);
/* Clear dangerous stuff, set PATH */
void sanitize_env_for_suid(void);
extern const char *opt_complementary;
#define No_argument "\0"
#define Required_argument "\001"
#define Optional_argument "\002"
extern const char *applet_long_options;
extern uint32_t option_mask32;
extern uint32_t getopt32(char **argv, const char *applet_opts, ...);
typedef struct llist_t {
char *data;
struct llist_t *link;
} llist_t;
void llist_add_to(llist_t **old_head, void *data);
void llist_add_to_end(llist_t **list_head, void *data);
void *llist_pop(llist_t **elm);
void llist_unlink(llist_t **head, llist_t *elm);
void llist_free(llist_t *elm, void (*freeit)(void *data));
llist_t *llist_rev(llist_t *list);
/* BTW, surprisingly, changing API to
* llist_t *llist_add_to(llist_t *old_head, void *data)
* etc does not result in smaller code... */
/* start_stop_daemon and udhcpc are special - they want
* to create pidfiles regardless of FEATURE_PIDFILE */
/* True only if we created pidfile which is *file*, not /dev/null etc */
extern smallint wrote_pidfile;
void write_pidfile(const char *path);
#define remove_pidfile(path) do { if (wrote_pidfile) unlink(path); } while (0)
enum { wrote_pidfile = 0 };
#define write_pidfile(path) ((void)0)
#define remove_pidfile(path) ((void)0)
enum {
LOGMODE_STDIO = (1 << 0),
extern const char *msg_eol;
extern smallint logmode;
extern int die_sleep;
extern int xfunc_error_retval;
extern jmp_buf die_jmp;
extern void xfunc_die(void) ATTRIBUTE_NORETURN;
extern void bb_show_usage(void) ATTRIBUTE_NORETURN;
extern void bb_error_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
extern void bb_error_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2)));
extern void bb_perror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
extern void bb_simple_perror_msg(const char *s);
extern void bb_perror_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2)));
extern void bb_simple_perror_msg_and_die(const char *s) __attribute__ ((noreturn));
extern void bb_herror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
extern void bb_herror_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2)));
extern void bb_perror_nomsg_and_die(void) ATTRIBUTE_NORETURN;
extern void bb_perror_nomsg(void);
extern void bb_info_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
extern void bb_verror_msg(const char *s, va_list p, const char *strerr);
/* We need to export XXX_main from libbusybox
* only if we build "individual" binaries
/* applets which are useful from another applets */
int bb_cat(char** argv);
int echo_main(int argc, char** argv) MAIN_EXTERNALLY_VISIBLE;
int test_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int kill_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
void bb_displayroutes(int noresolve, int netstatfmt);
int chown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bbunpack(char **argv,
char* (*make_new_name)(char *filename),
USE_DESKTOP(long long) int (*unpacker)(void)
/* Networking */
int create_icmp_socket(void);
int create_icmp6_socket(void);
/* interface.c */
/* This structure defines protocol families and their handlers. */
struct aftype {
const char *name;
const char *title;
int af;
int alen;
char *(*print) (unsigned char *);
const char *(*sprint) (struct sockaddr *, int numeric);
int (*input) (/*int type,*/ const char *bufp, struct sockaddr *);
void (*herror) (char *text);
int (*rprint) (int options);
int (*rinput) (int typ, int ext, char **argv);
/* may modify src */
int (*getmask) (char *src, struct sockaddr * mask, char *name);
/* This structure defines hardware protocols and their handlers. */
struct hwtype {
const char *name;
const char *title;
int type;
int alen;
char *(*print) (unsigned char *);
int (*input) (const char *, struct sockaddr *);
int (*activate) (int fd);
int suppress_null_addr;
extern smallint interface_opt_a;
int display_interfaces(char *ifname);
const struct aftype *get_aftype(const char *name);
const struct hwtype *get_hwtype(const char *name);
const struct hwtype *get_hwntype(int type);
extern int find_applet_by_name(const char *name);
/* Returns only if applet is not found. */
extern void run_applet_and_exit(const char *name, char **argv);
extern void run_applet_no_and_exit(int a, char **argv) ATTRIBUTE_NORETURN;
extern int match_fstype(const struct mntent *mt, const char *fstypes);
extern struct mntent *find_mount_point(const char *name, const char *table);
extern void erase_mtab(const char * name);
extern unsigned int tty_baud_to_value(speed_t speed);
extern speed_t tty_value_to_baud(unsigned int value);
extern void bb_warn_ignoring_args(int n);
extern int get_linux_version_code(void);
extern char *query_loop(const char *device);
extern int del_loop(const char *device);
/* If *devname is not NULL, use that name, otherwise try to find free one,
* malloc and return it in *devname.
* return value: 1: read-only loopdev was setup, 0: rw, < 0: error */
extern int set_loop(char **devname, const char *file, unsigned long long offset);
//TODO: pass buf pointer or return allocated buf (avoid statics)?
char *bb_askpass(int timeout, const char * prompt);
int bb_ask_confirmation(void);
extern int bb_parse_mode(const char* s, mode_t* theMode);
char *concat_path_file(const char *path, const char *filename);
char *concat_subpath_file(const char *path, const char *filename);
const char *bb_basename(const char *name);
/* NB: can violate const-ness (similarly to strchr) */
char *last_char_is(const char *s, int c);
USE_DESKTOP(long long) int uncompress(int fd_in, int fd_out);
int inflate(int in, int out);
int bb_make_directory(char *path, long mode, int flags);
int get_signum(const char *name);
const char *get_signame(int number);
void print_signames(void);
char *bb_simplify_path(const char *path);
#define FAIL_DELAY 3
extern void bb_do_delay(int seconds);
extern void change_identity(const struct passwd *pw);
extern const char *change_identity_e2str(const struct passwd *pw);
extern void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args) ATTRIBUTE_NORETURN;
extern void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args);
extern void renew_current_security_context(void);
extern void set_current_security_context(security_context_t sid);
extern context_t set_security_context_component(security_context_t cur_context,
char *user, char *role, char *type, char *range);
extern void setfscreatecon_or_die(security_context_t scontext);
extern void selinux_preserve_fcontext(int fdesc);
#define selinux_preserve_fcontext(fdesc) ((void)0)
extern void selinux_or_die(void);
extern int restricted_shell(const char *shell);
/* setup_environment:
* if loginshell = 1: cd(pw->pw_dir), clear environment, then set
* TERM=(old value)
* USER=pw->pw_name, LOGNAME=pw->pw_name
* PATH=bb_default_[root_]path
* HOME=pw->pw_dir
* SHELL=shell
* else if changeenv = 1:
* if not root (if pw->pw_uid != 0):
* USER=pw->pw_name, LOGNAME=pw->pw_name
* HOME=pw->pw_dir
* SHELL=shell
* else does nothing
extern void setup_environment(const char *shell, int loginshell, int changeenv, const struct passwd *pw);
extern int correct_password(const struct passwd *pw);
/* Returns a ptr to static storage */
extern char *pw_encrypt(const char *clear, const char *salt);
extern int obscure(const char *old, const char *newval, const struct passwd *pwdp);
int index_in_str_array(const char *const string_array[], const char *key);
int index_in_strings(const char *strings, const char *key);
int index_in_substr_array(const char *const string_array[], const char *key);
int index_in_substrings(const char *strings, const char *key);
const char *nth_string(const char *strings, int n);
extern void print_login_issue(const char *issue_file, const char *tty);
extern void print_login_prompt(void);
/* rnd is additional random input. New one is returned.
* Useful if you call crypt_make_salt many times in a row:
* rnd = crypt_make_salt(buf1, 4, 0);
* rnd = crypt_make_salt(buf2, 4, rnd);
* rnd = crypt_make_salt(buf3, 4, rnd);
* (otherwise we risk having same salt generated)
extern int crypt_make_salt(char *p, int cnt, int rnd);
/* Returns number of lines changed, or -1 on error */
extern int update_passwd(const char *filename, const char *username,
const char *new_pw);
/* NB: typically you want to pass fd 0, not 1. Think 'applet | grep something' */
int get_terminal_width_height(int fd, int *width, int *height);
int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name);
void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name);
#define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp,#request)
#define xioctl(fd,request,argp) bb_xioctl(fd,request,argp,#request)
int bb_ioctl_or_warn(int fd, int request, void *argp);
void bb_xioctl(int fd, int request, void *argp);
#define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp)
#define xioctl(fd,request,argp) bb_xioctl(fd,request,argp)
char *is_in_ino_dev_hashtable(const struct stat *statbuf);
void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name);
void reset_ino_dev_hashtable(void);
#ifdef __GLIBC__
/* At least glibc has horrendously large inline for this, so wrap it */
unsigned long long bb_makedev(unsigned int major, unsigned int minor);
#undef makedev
#define makedev(a,b) bb_makedev(a,b)
/* It's NOT just ENABLEd or disabled. It's a number: */
#define MAX_HISTORY 0
typedef struct line_input_t {
int flags;
const char *path_lookup;
int cnt_history;
int cur_history;
char *history[MAX_HISTORY + 1];
} line_input_t;
enum {
line_input_t *new_line_input_t(int flags);
/* Returns:
* -1 on read errors or EOF, or on bare Ctrl-D.
* 0 on ctrl-C,
* >0 length of input string, including terminating '\n'
* [is this true? stores "" in 'command' if return value is 0 or -1]
int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *state);
int read_line_input(const char* prompt, char* command, int maxsize);
#define read_line_input(prompt, command, maxsize, state) \
read_line_input(prompt, command, maxsize)
#ifndef COMM_LEN
/* synchronize with sizeof(task_struct.comm) in /usr/include/linux/sched.h */
enum { COMM_LEN = 16 };
typedef struct procps_status_t {
DIR *dir;
uint8_t shift_pages_to_bytes;
uint8_t shift_pages_to_kb;
/* Fields are set to 0/NULL if failed to determine (or not requested) */
char *argv0;
USE_SELINUX(char *context;)
/* Everything below must contain no ptrs to malloc'ed data:
* it is memset(0) for each process in procps_scan() */
unsigned long vsz, rss; /* we round it to kbytes */
unsigned long stime, utime;
unsigned pid;
unsigned ppid;
unsigned pgid;
unsigned sid;
unsigned uid;
unsigned gid;
unsigned tty_major,tty_minor;
unsigned long mapped_rw;
unsigned long mapped_ro;
unsigned long shared_clean;
unsigned long shared_dirty;
unsigned long private_clean;
unsigned long private_dirty;
unsigned long stack;
char state[4];
/* basename of executable in exec(2), read from /proc/N/stat
* (if executable is symlink or script, it is NOT replaced
* by link target or interpreter name) */
char comm[COMM_LEN];
/* user/group? - use passwd/group parsing functions */
} procps_status_t;
enum {
PSSCAN_PID = 1 << 0,
PSSCAN_PPID = 1 << 1,
PSSCAN_PGID = 1 << 2,
PSSCAN_SID = 1 << 3,
PSSCAN_COMM = 1 << 5,
/* PSSCAN_CMD = 1 << 6, - use read_cmdline instead */
PSSCAN_ARGV0 = 1 << 7,
/* PSSCAN_EXE = 1 << 8, - not implemented */
PSSCAN_STATE = 1 << 9,
PSSCAN_VSZ = 1 << 10,
PSSCAN_RSS = 1 << 11,
PSSCAN_STIME = 1 << 12,
PSSCAN_UTIME = 1 << 13,
PSSCAN_TTY = 1 << 14,
/* These are all retrieved from proc/NN/stat in one go: */
procps_status_t* alloc_procps_scan(int flags);
void free_procps_scan(procps_status_t* sp);
procps_status_t* procps_scan(procps_status_t* sp, int flags);
/* Format cmdline (up to col chars) into char buf[col+1] */
/* Puts [comm] if cmdline is empty (-> process is a kernel thread) */
void read_cmdline(char *buf, int col, unsigned pid, const char *comm);
pid_t *find_pid_by_name(const char* procName);
pid_t *pidlist_reverse(pid_t *pidList);
extern const char bb_uuenc_tbl_base64[];
extern const char bb_uuenc_tbl_std[];
void bb_uuencode(char *store, const void *s, int length, const char *tbl);
typedef struct sha1_ctx_t {
uint32_t count[2];
uint32_t hash[5];
uint32_t wbuf[16];
} sha1_ctx_t;
void sha1_begin(sha1_ctx_t *ctx);
void sha1_hash(const void *data, size_t length, sha1_ctx_t *ctx);
void *sha1_end(void *resbuf, sha1_ctx_t *ctx);
typedef struct md5_ctx_t {
uint32_t A;
uint32_t B;
uint32_t C;
uint32_t D;
uint64_t total;
uint32_t buflen;
char buffer[128];
} md5_ctx_t;
void md5_begin(md5_ctx_t *ctx);
void md5_hash(const void *data, size_t length, md5_ctx_t *ctx);
void *md5_end(void *resbuf, md5_ctx_t *ctx);
uint32_t *crc32_filltable(uint32_t *tbl256, int endian);
enum { /* DO NOT CHANGE THESE VALUES! cp.c, mv.c, install.c depend on them. */
extern const char *applet_name;
/* "BusyBox vN.N.N (timestamp or extra_vestion)" */
extern const char bb_banner[];
extern const char bb_msg_memory_exhausted[];
extern const char bb_msg_invalid_date[];
extern const char bb_msg_read_error[];
extern const char bb_msg_write_error[];
extern const char bb_msg_unknown[];
extern const char bb_msg_can_not_create_raw_socket[];
extern const char bb_msg_perm_denied_are_you_root[];
extern const char bb_msg_requires_arg[];
extern const char bb_msg_invalid_arg[];
extern const char bb_msg_standard_input[];
extern const char bb_msg_standard_output[];
extern const char bb_str_default[];
/* NB: (bb_hexdigits_upcase[i] | 0x20) -> lowercase hex digit */
extern const char bb_hexdigits_upcase[];
extern const char bb_path_mtab_file[];
extern const char bb_path_passwd_file[];
extern const char bb_path_shadow_file[];
extern const char bb_path_gshadow_file[];
extern const char bb_path_group_file[];
extern const char bb_path_motd_file[];
extern const char bb_path_wtmp_file[];
extern const char bb_dev_null[];
extern const char bb_busybox_exec_path[];
/* util-linux manpage says /sbin:/bin:/usr/sbin:/usr/bin,
* but I want to save a few bytes here */
extern const char bb_PATH_root_path[]; /* "PATH=/sbin:/usr/sbin:/bin:/usr/bin" */
#define bb_default_root_path (bb_PATH_root_path + sizeof("PATH"))
#define bb_default_path (bb_PATH_root_path + sizeof("PATH=/sbin:/usr/sbin"))
extern const int const_int_0;
extern const int const_int_1;
#ifndef BUFSIZ
#define BUFSIZ 4096
/* Providing hard guarantee on minimum size (think of BUFSIZ == 128) */
enum { COMMON_BUFSIZE = (BUFSIZ >= 256*sizeof(void*) ? BUFSIZ+1 : 256*sizeof(void*)) };
extern char bb_common_bufsiz1[COMMON_BUFSIZE];
/* This struct is deliberately not defined. */
/* See docs/keep_data_small.txt */
struct globals;
/* '*const' ptr makes gcc optimize code much better.
* Magic prevents ptr_to_globals from going into rodata.
* If you want to assign a value, use PTR_TO_GLOBALS = xxx */
extern struct globals *const ptr_to_globals;
#define PTR_TO_GLOBALS (*(struct globals**)&ptr_to_globals)
/* You can change LIBBB_DEFAULT_LOGIN_SHELL, but don't use it,
* use bb_default_login_shell and following defines.
* don't forget to change increment constant. */
#define LIBBB_DEFAULT_LOGIN_SHELL "-/bin/sh"
extern const char bb_default_login_shell[];
/* "/bin/sh" */
#define DEFAULT_SHELL (bb_default_login_shell+1)
/* "sh" */
#define DEFAULT_SHELL_SHORT_NAME (bb_default_login_shell+6)
# define CURRENT_VC "/dev/vc/0"
# define VC_1 "/dev/vc/1"
# define VC_2 "/dev/vc/2"
# define VC_3 "/dev/vc/3"
# define VC_4 "/dev/vc/4"
# define VC_5 "/dev/vc/5"
#if defined(__sh__) || defined(__H8300H__) || defined(__H8300S__)
/* Yes, this sucks, but both SH (including sh64) and H8 have a SCI(F) for their
respective serial ports .. as such, we can't use the common device paths for
these. -- PFM */
# define SC_0 "/dev/ttsc/0"
# define SC_1 "/dev/ttsc/1"
# define SC_FORMAT "/dev/ttsc/%d"
# define SC_0 "/dev/tts/0"
# define SC_1 "/dev/tts/1"
# define SC_FORMAT "/dev/tts/%d"
# define VC_FORMAT "/dev/vc/%d"
# define LOOP_FORMAT "/dev/loop/%d"
# define LOOP_NAMESIZE (sizeof("/dev/loop/") + sizeof(int)*3 + 1)
# define LOOP_NAME "/dev/loop/"
# define FB_0 "/dev/fb/0"
# define CURRENT_VC "/dev/tty0"
# define VC_1 "/dev/tty1"
# define VC_2 "/dev/tty2"
# define VC_3 "/dev/tty3"
# define VC_4 "/dev/tty4"
# define VC_5 "/dev/tty5"
#if defined(__sh__) || defined(__H8300H__) || defined(__H8300S__)
# define SC_0 "/dev/ttySC0"
# define SC_1 "/dev/ttySC1"
# define SC_FORMAT "/dev/ttySC%d"
# define SC_0 "/dev/ttyS0"
# define SC_1 "/dev/ttyS1"
# define SC_FORMAT "/dev/ttyS%d"
# define VC_FORMAT "/dev/tty%d"
# define LOOP_FORMAT "/dev/loop%d"
# define LOOP_NAMESIZE (sizeof("/dev/loop") + sizeof(int)*3 + 1)
# define LOOP_NAME "/dev/loop"
# define FB_0 "/dev/fb0"
/* The following devices are the same on devfs and non-devfs systems. */
#define CURRENT_TTY "/dev/tty"
#define DEV_CONSOLE "/dev/console"
#ifndef RB_POWER_OFF
/* Stop system and switch power off if possible. */
#define RB_POWER_OFF 0x4321fedc
/* Make sure we call functions instead of macros. */
#undef isalnum
#undef isalpha
#undef isascii
#undef isblank
#undef iscntrl
#undef isgraph
#undef islower
#undef isprint
#undef ispunct
#undef isspace
#undef isupper
#undef isxdigit
/* This one is more efficient - we save ~400 bytes */
#undef isdigit
#define isdigit(a) ((unsigned)((a) - '0') <= 9)
#ifdef DMALLOC
#include <dmalloc.h>
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif /* __LIBBUSYBOX_H__ */