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busybox/utility.c
Eric Andersen cbe31dace5 It turns out that DODMALLOC was broken when I reorganized busybox.h 
header file usage before the 0.49 release.  To fix it, I had to move
the '#include "busybox.h"' to the end of the list of #include files.
 -Erik
2001-02-20 06:14:08 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) tons of folks. Tracking down who wrote what
* isn't something I'm going to worry about... If you wrote something
* here, please feel free to acknowledge your work.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* 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.
*
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <time.h>
#include <utime.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/utsname.h> /* for uname(2) */
#include "busybox.h"
#if defined (BB_CHMOD_CHOWN_CHGRP) \
|| defined (BB_CP_MV) \
|| defined (BB_FIND) \
|| defined (BB_INSMOD) \
|| defined (BB_LS) \
|| defined (BB_RM) \
|| defined (BB_TAR)
/* same conditions as recursive_action */
#define bb_need_name_too_long
#endif
#define bb_need_memory_exhausted
#define bb_need_full_version
#define BB_DECLARE_EXTERN
#include "messages.c"
#include "usage.h"
#include "pwd_grp/pwd.h"
#include "pwd_grp/grp.h"
/* for the _syscall() macros */
#include <sys/syscall.h>
#include <linux/unistd.h>
/* Busybox mount uses either /proc/filesystems or /dev/mtab to get the
* list of available filesystems used for the -t auto option */
#if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF
# if defined BB_MTAB
const char mtab_file[] = "/etc/mtab";
# else
# if defined BB_FEATURE_USE_DEVPS_PATCH
const char mtab_file[] = "/dev/mtab";
# else
const char mtab_file[] = "/proc/mounts";
# endif
# endif
#endif
static struct BB_applet *applet_using;
extern void show_usage(void)
{
static const char no_help[] = "No help available.\n";
const char *usage_string = no_help;
int i;
if (applet_using->usage_index >= 0) {
usage_string = usage_messages;
for (i=applet_using->usage_index ; i>0 ; ) {
if (!*usage_string++) {
--i;
}
}
}
fprintf(stderr, "%s\n\nUsage: %s %s\n\n", full_version,
applet_using->name, usage_string);
exit(EXIT_FAILURE);
}
static void verror_msg(const char *s, va_list p)
{
fflush(stdout);
fprintf(stderr, "%s: ", applet_name);
vfprintf(stderr, s, p);
}
extern void error_msg(const char *s, ...)
{
va_list p;
va_start(p, s);
verror_msg(s, p);
va_end(p);
putc('\n', stderr);
}
extern void error_msg_and_die(const char *s, ...)
{
va_list p;
va_start(p, s);
verror_msg(s, p);
va_end(p);
putc('\n', stderr);
exit(EXIT_FAILURE);
}
static void vperror_msg(const char *s, va_list p)
{
int err=errno;
if(s == 0) s = "";
verror_msg(s, p);
if (*s) s = ": ";
fprintf(stderr, "%s%s\n", s, strerror(err));
}
extern void perror_msg(const char *s, ...)
{
va_list p;
va_start(p, s);
vperror_msg(s, p);
va_end(p);
}
extern void perror_msg_and_die(const char *s, ...)
{
va_list p;
va_start(p, s);
vperror_msg(s, p);
va_end(p);
exit(EXIT_FAILURE);
}
#if defined BB_INIT || defined BB_MKSWAP || defined BB_MOUNT || defined BB_NFSMOUNT
/* Returns kernel version encoded as major*65536 + minor*256 + patch,
* so, for example, to check if the kernel is greater than 2.2.11:
* if (get_kernel_revision() <= 2*65536+2*256+11) { <stuff> }
*/
extern int get_kernel_revision(void)
{
struct utsname name;
char *s;
int i, r;
if (uname(&name) == -1) {
perror_msg("cannot get system information");
return (0);
}
s = name.release;
r = 0;
for (i=0 ; i<3 ; i++) {
r = r * 256 + atoi(strtok(s, "."));
s = NULL;
}
return r;
}
#endif /* BB_INIT */
#if defined BB_FREE || defined BB_INIT || defined BB_UNAME || defined BB_UPTIME
_syscall1(int, sysinfo, struct sysinfo *, info);
#endif /* BB_INIT */
#if defined BB_MOUNT || defined BB_UMOUNT
#ifndef __NR_umount2
static const int __NR_umount2 = 52;
#endif
/* Include our own version of <sys/mount.h>, since libc5 doesn't
* know about umount2 */
extern _syscall1(int, umount, const char *, special_file);
extern _syscall2(int, umount2, const char *, special_file, int, flags);
extern _syscall5(int, mount, const char *, special_file, const char *, dir,
const char *, fstype, unsigned long int, rwflag, const void *, data);
#endif
#if defined BB_INSMOD || defined BB_LSMOD
#ifndef __NR_query_module
static const int __NR_query_module = 167;
#endif
_syscall5(int, query_module, const char *, name, int, which,
void *, buf, size_t, bufsize, size_t*, ret);
#endif
#if defined (BB_CP_MV) || defined (BB_DU)
#define HASH_SIZE 311 /* Should be prime */
#define hash_inode(i) ((i) % HASH_SIZE)
static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
/*
* Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
* `ino_dev_hashtable', else return 0
*
* If NAME is a non-NULL pointer to a character pointer, and there is
* a match, then set *NAME to the value of the name slot in that
* bucket.
*/
int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
{
ino_dev_hashtable_bucket_t *bucket;
bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
while (bucket != NULL) {
if ((bucket->ino == statbuf->st_ino) &&
(bucket->dev == statbuf->st_dev))
{
if (name) *name = bucket->name;
return 1;
}
bucket = bucket->next;
}
return 0;
}
/* Add statbuf to statbuf hash table */
void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
{
int i;
size_t s;
ino_dev_hashtable_bucket_t *bucket;
i = hash_inode(statbuf->st_ino);
s = name ? strlen(name) : 0;
bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
bucket->ino = statbuf->st_ino;
bucket->dev = statbuf->st_dev;
if (name)
strcpy(bucket->name, name);
else
bucket->name[0] = '\0';
bucket->next = ino_dev_hashtable[i];
ino_dev_hashtable[i] = bucket;
}
/* Clear statbuf hash table */
void reset_ino_dev_hashtable(void)
{
int i;
ino_dev_hashtable_bucket_t *bucket;
for (i = 0; i < HASH_SIZE; i++) {
while (ino_dev_hashtable[i] != NULL) {
bucket = ino_dev_hashtable[i]->next;
free(ino_dev_hashtable[i]);
ino_dev_hashtable[i] = bucket;
}
}
}
#endif /* BB_CP_MV || BB_DU */
#if defined (BB_CP_MV) || defined (BB_DU) || defined (BB_LN) || defined (BB_DPKG_DEB)
/*
* Return TRUE if a fileName is a directory.
* Nonexistant files return FALSE.
*/
int is_directory(const char *fileName, const int followLinks, struct stat *statBuf)
{
int status;
int didMalloc = 0;
if (statBuf == NULL) {
statBuf = (struct stat *)xmalloc(sizeof(struct stat));
++didMalloc;
}
if (followLinks == TRUE)
status = stat(fileName, statBuf);
else
status = lstat(fileName, statBuf);
if (status < 0 || !(S_ISDIR(statBuf->st_mode))) {
status = FALSE;
}
else status = TRUE;
if (didMalloc) {
free(statBuf);
statBuf = NULL;
}
return status;
}
#endif
#if defined BB_AR || defined BB_CP_MV
/*
* Copy chunksize bytes between two file descriptors
*/
int copy_file_chunk(int srcfd, int dstfd, size_t chunksize)
{
size_t size;
char buffer[BUFSIZ]; /* BUFSIZ is declared in stdio.h */
while (chunksize > 0) {
if (chunksize > BUFSIZ)
size = BUFSIZ;
else
size = chunksize;
if (full_write(dstfd, buffer, full_read(srcfd, buffer, size)) < size)
return(FALSE);
chunksize -= size;
}
return (TRUE);
}
#endif
#if defined (BB_CP_MV) || defined BB_DPKG
/*
* Copy one file to another, while possibly preserving its modes, times, and
* modes. Returns TRUE if successful, or FALSE on a failure with an error
* message output. (Failure is not indicated if attributes cannot be set.)
* -Erik Andersen
*/
int
copy_file(const char *srcName, const char *destName,
int setModes, int followLinks, int forceFlag)
{
int rfd;
int wfd;
int status;
struct stat srcStatBuf;
struct stat dstStatBuf;
struct utimbuf times;
if (followLinks == TRUE)
status = stat(srcName, &srcStatBuf);
else
status = lstat(srcName, &srcStatBuf);
if (status < 0) {
perror_msg("%s", srcName);
return FALSE;
}
if (followLinks == TRUE)
status = stat(destName, &dstStatBuf);
else
status = lstat(destName, &dstStatBuf);
if (status < 0 || forceFlag==TRUE) {
unlink(destName);
dstStatBuf.st_ino = -1;
dstStatBuf.st_dev = -1;
}
if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
(srcStatBuf.st_ino == dstStatBuf.st_ino)) {
error_msg("Copying file \"%s\" to itself", srcName);
return FALSE;
}
if (S_ISDIR(srcStatBuf.st_mode)) {
//fprintf(stderr, "copying directory %s to %s\n", srcName, destName);
/* Make sure the directory is writable */
status = mkdir(destName, 0777777 ^ umask(0));
if (status < 0 && errno != EEXIST) {
perror_msg("%s", destName);
return FALSE;
}
} else if (S_ISLNK(srcStatBuf.st_mode)) {
char link_val[BUFSIZ + 1];
int link_size;
//fprintf(stderr, "copying link %s to %s\n", srcName, destName);
/* Warning: This could possibly truncate silently, to BUFSIZ chars */
link_size = readlink(srcName, &link_val[0], BUFSIZ);
if (link_size < 0) {
perror_msg("%s", srcName);
return FALSE;
}
link_val[link_size] = '\0';
status = symlink(link_val, destName);
if (status < 0) {
perror_msg("%s", destName);
return FALSE;
}
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
if (setModes == TRUE) {
/* Try to set owner, but fail silently like GNU cp */
lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
}
#endif
return TRUE;
} else if (S_ISFIFO(srcStatBuf.st_mode)) {
//fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
if (mkfifo(destName, 0644) < 0) {
perror_msg("%s", destName);
return FALSE;
}
} else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode)
|| S_ISSOCK(srcStatBuf.st_mode)) {
//fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName);
if (mknod(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
perror_msg("%s", destName);
return FALSE;
}
} else if (S_ISREG(srcStatBuf.st_mode)) {
//fprintf(stderr, "copying regular file %s to %s\n", srcName, destName);
rfd = open(srcName, O_RDONLY);
if (rfd < 0) {
perror_msg("%s", srcName);
return FALSE;
}
wfd = open(destName, O_WRONLY | O_CREAT | O_TRUNC,
srcStatBuf.st_mode);
if (wfd < 0) {
perror_msg("%s", destName);
close(rfd);
return FALSE;
}
if (copy_file_chunk(rfd, wfd, srcStatBuf.st_size)==FALSE)
goto error_exit;
close(rfd);
if (close(wfd) < 0) {
return FALSE;
}
}
if (setModes == TRUE) {
/* This is fine, since symlinks never get here */
if (chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0)
perror_msg_and_die("%s", destName);
if (chmod(destName, srcStatBuf.st_mode) < 0)
perror_msg_and_die("%s", destName);
times.actime = srcStatBuf.st_atime;
times.modtime = srcStatBuf.st_mtime;
if (utime(destName, &times) < 0)
perror_msg_and_die("%s", destName);
}
return TRUE;
error_exit:
perror_msg("%s", destName);
close(rfd);
close(wfd);
return FALSE;
}
#endif /* BB_CP_MV */
#if defined BB_TAR || defined BB_LS ||defined BB_AR
#define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
#define TYPECHAR(mode) ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])
/* The special bits. If set, display SMODE0/1 instead of MODE0/1 */
static const mode_t SBIT[] = {
0, 0, S_ISUID,
0, 0, S_ISGID,
0, 0, S_ISVTX
};
/* The 9 mode bits to test */
static const mode_t MBIT[] = {
S_IRUSR, S_IWUSR, S_IXUSR,
S_IRGRP, S_IWGRP, S_IXGRP,
S_IROTH, S_IWOTH, S_IXOTH
};
static const char MODE1[] = "rwxrwxrwx";
static const char MODE0[] = "---------";
static const char SMODE1[] = "..s..s..t";
static const char SMODE0[] = "..S..S..T";
/*
* Return the standard ls-like mode string from a file mode.
* This is static and so is overwritten on each call.
*/
const char *mode_string(int mode)
{
static char buf[12];
int i;
buf[0] = TYPECHAR(mode);
for (i = 0; i < 9; i++) {
if (mode & SBIT[i])
buf[i + 1] = (mode & MBIT[i]) ? SMODE1[i] : SMODE0[i];
else
buf[i + 1] = (mode & MBIT[i]) ? MODE1[i] : MODE0[i];
}
return buf;
}
#endif /* BB_TAR || BB_LS */
#if defined BB_TAR || defined BB_AR
/*
* Return the standard ls-like time string from a time_t
* This is static and so is overwritten on each call.
*/
const char *time_string(time_t timeVal)
{
time_t now;
char *str;
static char buf[26];
time(&now);
str = ctime(&timeVal);
strcpy(buf, &str[4]);
buf[12] = '\0';
if ((timeVal > now) || (timeVal < now - 365 * 24 * 60 * 60L)) {
strcpy(&buf[7], &str[20]);
buf[11] = '\0';
}
return buf;
}
#endif /* BB_TAR || BB_AR */
#if defined BB_DD || defined BB_NC || defined BB_TAIL || defined BB_TAR || defined BB_AR || defined BB_CP_MV
/*
* Write all of the supplied buffer out to a file.
* This does multiple writes as necessary.
* Returns the amount written, or -1 on an error.
*/
int full_write(int fd, const char *buf, int len)
{
int cc;
int total;
total = 0;
while (len > 0) {
cc = write(fd, buf, len);
if (cc < 0)
return -1;
buf += cc;
total += cc;
len -= cc;
}
return total;
}
#endif
#if defined BB_AR || defined BB_CP_MV || defined BB_SH || defined BB_TAR
/*
* Read all of the supplied buffer from a file.
* This does multiple reads as necessary.
* Returns the amount read, or -1 on an error.
* A short read is returned on an end of file.
*/
int full_read(int fd, char *buf, int len)
{
int cc;
int total;
total = 0;
while (len > 0) {
cc = read(fd, buf, len);
if (cc < 0)
return -1;
if (cc == 0)
break;
buf += cc;
total += cc;
len -= cc;
}
return total;
}
#endif /* BB_TAR || BB_TAIL || BB_AR || BB_SH */
#if defined (BB_CHMOD_CHOWN_CHGRP) \
|| defined (BB_CP_MV) \
|| defined (BB_FIND) \
|| defined (BB_INSMOD) \
|| defined (BB_LS) \
|| defined (BB_RM) \
|| defined (BB_TAR)
/*
* Walk down all the directories under the specified
* location, and do something (something specified
* by the fileAction and dirAction function pointers).
*
* Unfortunately, while nftw(3) could replace this and reduce
* code size a bit, nftw() wasn't supported before GNU libc 2.1,
* and so isn't sufficiently portable to take over since glibc2.1
* is so stinking huge.
*/
int recursive_action(const char *fileName,
int recurse, int followLinks, int depthFirst,
int (*fileAction) (const char *fileName,
struct stat * statbuf,
void* userData),
int (*dirAction) (const char *fileName,
struct stat * statbuf,
void* userData),
void* userData)
{
int status;
struct stat statbuf;
struct dirent *next;
if (followLinks == TRUE)
status = stat(fileName, &statbuf);
else
status = lstat(fileName, &statbuf);
if (status < 0) {
#ifdef BB_DEBUG_PRINT_SCAFFOLD
fprintf(stderr,
"status=%d followLinks=%d TRUE=%d\n",
status, followLinks, TRUE);
#endif
perror_msg("%s", fileName);
return FALSE;
}
if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
if (fileAction == NULL)
return TRUE;
else
return fileAction(fileName, &statbuf, userData);
}
if (recurse == FALSE) {
if (S_ISDIR(statbuf.st_mode)) {
if (dirAction != NULL)
return (dirAction(fileName, &statbuf, userData));
else
return TRUE;
}
}
if (S_ISDIR(statbuf.st_mode)) {
DIR *dir;
if (dirAction != NULL && depthFirst == FALSE) {
status = dirAction(fileName, &statbuf, userData);
if (status == FALSE) {
perror_msg("%s", fileName);
return FALSE;
} else if (status == SKIP)
return TRUE;
}
dir = opendir(fileName);
if (!dir) {
perror_msg("%s", fileName);
return FALSE;
}
while ((next = readdir(dir)) != NULL) {
char nextFile[BUFSIZ + 1];
if ((strcmp(next->d_name, "..") == 0)
|| (strcmp(next->d_name, ".") == 0)) {
continue;
}
if (strlen(fileName) + strlen(next->d_name) + 1 > BUFSIZ) {
error_msg(name_too_long);
return FALSE;
}
memset(nextFile, 0, sizeof(nextFile));
sprintf(nextFile, "%s/%s", fileName, next->d_name);
status =
recursive_action(nextFile, TRUE, followLinks, depthFirst,
fileAction, dirAction, userData);
if (status == FALSE) {
closedir(dir);
return FALSE;
}
}
status = closedir(dir);
if (status < 0) {
perror_msg("%s", fileName);
return FALSE;
}
if (dirAction != NULL && depthFirst == TRUE) {
status = dirAction(fileName, &statbuf, userData);
if (status == FALSE) {
perror_msg("%s", fileName);
return FALSE;
}
}
} else {
if (fileAction == NULL)
return TRUE;
else
return fileAction(fileName, &statbuf, userData);
}
return TRUE;
}
#endif /* BB_CHMOD_CHOWN_CHGRP || BB_CP_MV || BB_FIND || BB_LS || BB_INSMOD */
#if defined (BB_TAR) || defined (BB_MKDIR)
/*
* Attempt to create the directories along the specified path, except for
* the final component. The mode is given for the final directory only,
* while all previous ones get default protections. Errors are not reported
* here, as failures to restore files can be reported later.
*/
extern int create_path(const char *name, int mode)
{
char *cp;
char *cpOld;
char buf[BUFSIZ + 1];
int retVal = 0;
strcpy(buf, name);
for (cp = buf; *cp == '/'; cp++);
cp = strchr(cp, '/');
while (cp) {
cpOld = cp;
cp = strchr(cp + 1, '/');
*cpOld = '\0';
retVal = mkdir(buf, cp ? 0777 : mode);
if (retVal != 0 && errno != EEXIST) {
perror_msg("%s", buf);
return FALSE;
}
*cpOld = '/';
}
return TRUE;
}
#endif /* BB_TAR || BB_MKDIR */
#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_MKDIR) \
|| defined (BB_MKFIFO) || defined (BB_MKNOD) || defined (BB_AR)
/* [ugoa]{+|-|=}[rwxst] */
extern int parse_mode(const char *s, mode_t * theMode)
{
static const mode_t group_set[] = {
S_ISUID | S_IRWXU, /* u */
S_ISGID | S_IRWXG, /* g */
S_IRWXO, /* o */
S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO /* a */
};
static const mode_t mode_set[] = {
S_IRUSR | S_IRGRP | S_IROTH, /* r */
S_IWUSR | S_IWGRP | S_IWOTH, /* w */
S_IXUSR | S_IXGRP | S_IXOTH, /* x */
S_ISUID | S_ISGID, /* s */
S_ISVTX /* t */
};
static const char group_string[] = "ugoa";
static const char mode_string[] = "rwxst";
const char *p;
mode_t andMode =
S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
mode_t orMode = 0;
mode_t mode;
mode_t groups;
char type;
char c;
if (s==NULL) {
return (FALSE);
}
do {
mode = 0;
groups = 0;
NEXT_GROUP:
if ((c = *s++) == '\0') {
return -1;
}
for (p=group_string ; *p ; p++) {
if (*p == c) {
groups |= group_set[(int)(p-group_string)];
goto NEXT_GROUP;
}
}
switch (c) {
case '=':
case '+':
case '-':
type = c;
if (groups == 0) { /* The default is "all" */
groups |= S_ISUID | S_ISGID | S_ISVTX
| S_IRWXU | S_IRWXG | S_IRWXO;
}
break;
default:
if ((c < '0') || (c > '7') || (mode | groups)) {
return (FALSE);
} else {
*theMode = strtol(--s, NULL, 8);
return (TRUE);
}
}
NEXT_MODE:
if (((c = *s++) != '\0') && (c != ',')) {
for (p=mode_string ; *p ; p++) {
if (*p == c) {
mode |= mode_set[(int)(p-mode_string)];
goto NEXT_MODE;
}
}
break; /* We're done so break out of loop.*/
}
switch (type) {
case '=':
andMode &= ~(groups); /* Now fall through. */
case '+':
orMode |= mode & groups;
break;
case '-':
andMode &= ~(mode & groups);
orMode &= ~(mode & groups);
break;
}
} while (c == ',');
*theMode &= andMode;
*theMode |= orMode;
return TRUE;
}
#endif
/* BB_CHMOD_CHOWN_CHGRP || BB_MKDIR || BB_MKFIFO || BB_MKNOD */
#if defined BB_CHMOD_CHOWN_CHGRP || defined BB_PS || defined BB_LS \
|| defined BB_TAR || defined BB_ID || defined BB_LOGGER \
|| defined BB_LOGNAME || defined BB_WHOAMI || defined BB_SH
/* returns a uid given a username */
long my_getpwnam(char *name)
{
struct passwd *myuser;
myuser = getpwnam(name);
if (myuser==NULL)
return(-1);
return myuser->pw_uid;
}
/* returns a gid given a group name */
long my_getgrnam(char *name)
{
struct group *mygroup;
mygroup = getgrnam(name);
if (mygroup==NULL)
return(-1);
return (mygroup->gr_gid);
}
/* gets a username given a uid */
void my_getpwuid(char *name, long uid)
{
struct passwd *myuser;
myuser = getpwuid(uid);
if (myuser==NULL)
sprintf(name, "%-8ld ", (long)uid);
else
strcpy(name, myuser->pw_name);
}
/* gets a groupname given a gid */
void my_getgrgid(char *group, long gid)
{
struct group *mygroup;
mygroup = getgrgid(gid);
if (mygroup==NULL)
sprintf(group, "%-8ld ", (long)gid);
else
strcpy(group, mygroup->gr_name);
}
#if defined BB_ID
/* gets a gid given a user name */
long my_getpwnamegid(char *name)
{
struct group *mygroup;
struct passwd *myuser;
myuser=getpwnam(name);
if (myuser==NULL)
error_msg_and_die( "unknown user name: %s", name);
mygroup = getgrgid(myuser->pw_gid);
if (mygroup==NULL)
error_msg_and_die( "unknown gid %ld", (long)myuser->pw_gid);
return mygroup->gr_gid;
}
#endif /* BB_ID */
#endif
/* BB_CHMOD_CHOWN_CHGRP || BB_PS || BB_LS || BB_TAR \
|| BB_ID || BB_LOGGER || BB_LOGNAME || BB_WHOAMI */
#if (defined BB_CHVT) || (defined BB_DEALLOCVT) || (defined BB_SETKEYCODES)
/* From <linux/kd.h> */
static const int KDGKBTYPE = 0x4B33; /* get keyboard type */
static const int KB_84 = 0x01;
static const int KB_101 = 0x02; /* this is what we always answer */
int is_a_console(int fd)
{
char arg;
arg = 0;
return (ioctl(fd, KDGKBTYPE, &arg) == 0
&& ((arg == KB_101) || (arg == KB_84)));
}
static int open_a_console(char *fnam)
{
int fd;
/* try read-only */
fd = open(fnam, O_RDWR);
/* if failed, try read-only */
if (fd < 0 && errno == EACCES)
fd = open(fnam, O_RDONLY);
/* if failed, try write-only */
if (fd < 0 && errno == EACCES)
fd = open(fnam, O_WRONLY);
/* if failed, fail */
if (fd < 0)
return -1;
/* if not a console, fail */
if (!is_a_console(fd)) {
close(fd);
return -1;
}
/* success */
return fd;
}
/*
* Get an fd for use with kbd/console ioctls.
* We try several things because opening /dev/console will fail
* if someone else used X (which does a chown on /dev/console).
*
* if tty_name is non-NULL, try this one instead.
*/
int get_console_fd(char *tty_name)
{
int fd;
if (tty_name) {
if (-1 == (fd = open_a_console(tty_name)))
return -1;
else
return fd;
}
fd = open_a_console("/dev/tty");
if (fd >= 0)
return fd;
fd = open_a_console("/dev/tty0");
if (fd >= 0)
return fd;
fd = open_a_console("/dev/console");
if (fd >= 0)
return fd;
for (fd = 0; fd < 3; fd++)
if (is_a_console(fd))
return fd;
error_msg("Couldnt get a file descriptor referring to the console");
return -1; /* total failure */
}
#endif /* BB_CHVT || BB_DEALLOCVT || BB_SETKEYCODES */
#if defined BB_FIND || defined BB_INSMOD
/*
* Routine to see if a text string is matched by a wildcard pattern.
* Returns TRUE if the text is matched, or FALSE if it is not matched
* or if the pattern is invalid.
* * matches zero or more characters
* ? matches a single character
* [abc] matches 'a', 'b' or 'c'
* \c quotes character c
* Adapted from code written by Ingo Wilken, and
* then taken from sash, Copyright (c) 1999 by David I. Bell
* Permission is granted to use, distribute, or modify this source,
* provided that this copyright notice remains intact.
* Permission to distribute this code under the GPL has been granted.
*/
extern int check_wildcard_match(const char *text, const char *pattern)
{
const char *retryPat;
const char *retryText;
int ch;
int found;
int len;
retryPat = NULL;
retryText = NULL;
while (*text || *pattern) {
ch = *pattern++;
switch (ch) {
case '*':
retryPat = pattern;
retryText = text;
break;
case '[':
found = FALSE;
while ((ch = *pattern++) != ']') {
if (ch == '\\')
ch = *pattern++;
if (ch == '\0')
return FALSE;
if (*text == ch)
found = TRUE;
}
len=strlen(text);
if (found == FALSE && len!=0) {
return FALSE;
}
if (found == TRUE) {
if (strlen(pattern)==0 && len==1) {
return TRUE;
}
if (len!=0) {
text++;
continue;
}
}
/* fall into next case */
case '?':
if (*text++ == '\0')
return FALSE;
break;
case '\\':
ch = *pattern++;
if (ch == '\0')
return FALSE;
/* fall into next case */
default:
if (*text == ch) {
if (*text)
text++;
break;
}
if (*text) {
pattern = retryPat;
text = ++retryText;
break;
}
return FALSE;
}
if (pattern == NULL)
return FALSE;
}
return TRUE;
}
#endif /* BB_FIND || BB_INSMOD */
#if defined BB_DF || defined BB_MTAB
#include <mntent.h>
/*
* Given a block device, find the mount table entry if that block device
* is mounted.
*
* Given any other file (or directory), find the mount table entry for its
* filesystem.
*/
extern struct mntent *find_mount_point(const char *name, const char *table)
{
struct stat s;
dev_t mountDevice;
FILE *mountTable;
struct mntent *mountEntry;
if (stat(name, &s) != 0)
return 0;
if ((s.st_mode & S_IFMT) == S_IFBLK)
mountDevice = s.st_rdev;
else
mountDevice = s.st_dev;
if ((mountTable = setmntent(table, "r")) == 0)
return 0;
while ((mountEntry = getmntent(mountTable)) != 0) {
if (strcmp(name, mountEntry->mnt_dir) == 0
|| strcmp(name, mountEntry->mnt_fsname) == 0) /* String match. */
break;
if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
break;
if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
break;
}
endmntent(mountTable);
return mountEntry;
}
#endif /* BB_DF || BB_MTAB */
#if defined BB_INIT || defined BB_SYSLOGD
/* try to open up the specified device */
extern int device_open(char *device, int mode)
{
int m, f, fd = -1;
m = mode | O_NONBLOCK;
/* Retry up to 5 times */
for (f = 0; f < 5; f++)
if ((fd = open(device, m, 0600)) >= 0)
break;
if (fd < 0)
return fd;
/* Reset original flags. */
if (m != mode)
fcntl(fd, F_SETFL, mode);
return fd;
}
#endif /* BB_INIT BB_SYSLOGD */
#if defined BB_KILLALL || ( defined BB_FEATURE_LINUXRC && ( defined BB_HALT || defined BB_REBOOT || defined BB_POWEROFF ))
#ifdef BB_FEATURE_USE_DEVPS_PATCH
#include <linux/devps.h> /* For Erik's nifty devps device driver */
#endif
#if defined BB_FEATURE_USE_DEVPS_PATCH
/* find_pid_by_name()
*
* This finds the pid of the specified process,
* by using the /dev/ps device driver.
*
* Returns a list of all matching PIDs
*/
extern pid_t* find_pid_by_name( char* pidName)
{
int fd, i, j;
char device[] = "/dev/ps";
pid_t num_pids;
pid_t* pid_array = NULL;
pid_t* pidList=NULL;
/* open device */
fd = open(device, O_RDONLY);
if (fd < 0)
perror_msg_and_die("open failed for `%s'", device);
/* Find out how many processes there are */
if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
perror_msg_and_die("\nDEVPS_GET_PID_LIST");
/* Allocate some memory -- grab a few extras just in case
* some new processes start up while we wait. The kernel will
* just ignore any extras if we give it too many, and will trunc.
* the list if we give it too few. */
pid_array = (pid_t*) xcalloc( num_pids+10, sizeof(pid_t));
pid_array[0] = num_pids+10;
/* Now grab the pid list */
if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
perror_msg_and_die("\nDEVPS_GET_PID_LIST");
/* Now search for a match */
for (i=1, j=0; i<pid_array[0] ; i++) {
char* p;
struct pid_info info;
info.pid = pid_array[i];
if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
perror_msg_and_die("\nDEVPS_GET_PID_INFO");
/* Make sure we only match on the process name */
p=info.command_line+1;
while ((*p != 0) && !isspace(*(p)) && (*(p-1) != '\\')) {
(p)++;
}
if (isspace(*(p)))
*p='\0';
if ((strstr(info.command_line, pidName) != NULL)
&& (strlen(pidName) == strlen(info.command_line))) {
pidList=xrealloc( pidList, sizeof(pid_t) * (j+2));
pidList[j++]=info.pid;
}
}
if (pidList)
pidList[j]=0;
/* Free memory */
free( pid_array);
/* close device */
if (close (fd) != 0)
perror_msg_and_die("close failed for `%s'", device);
return pidList;
}
#else /* BB_FEATURE_USE_DEVPS_PATCH */
/* find_pid_by_name()
*
* This finds the pid of the specified process.
* Currently, it's implemented by rummaging through
* the proc filesystem.
*
* Returns a list of all matching PIDs
*/
extern pid_t* find_pid_by_name( char* pidName)
{
DIR *dir;
struct dirent *next;
pid_t* pidList=NULL;
int i=0;
dir = opendir("/proc");
if (!dir)
perror_msg_and_die("Cannot open /proc");
while ((next = readdir(dir)) != NULL) {
FILE *status;
char filename[256];
char buffer[256];
/* If it isn't a number, we don't want it */
if (!isdigit(*next->d_name))
continue;
sprintf(filename, "/proc/%s/cmdline", next->d_name);
status = fopen(filename, "r");
if (!status) {
continue;
}
fgets(buffer, 256, status);
fclose(status);
if (strstr(get_last_path_component(buffer), pidName) != NULL) {
pidList=xrealloc( pidList, sizeof(pid_t) * (i+2));
pidList[i++]=strtol(next->d_name, NULL, 0);
}
}
if (pidList)
pidList[i]=0;
return pidList;
}
#endif /* BB_FEATURE_USE_DEVPS_PATCH */
#endif /* BB_KILLALL || ( BB_FEATURE_LINUXRC && ( BB_HALT || BB_REBOOT || BB_POWEROFF )) */
#ifndef DMALLOC
/* this should really be farmed out to libbusybox.a */
extern void *xmalloc(size_t size)
{
void *ptr = malloc(size);
if (!ptr)
error_msg_and_die(memory_exhausted);
return ptr;
}
extern void *xrealloc(void *old, size_t size)
{
void *ptr = realloc(old, size);
if (!ptr)
error_msg_and_die(memory_exhausted);
return ptr;
}
extern void *xcalloc(size_t nmemb, size_t size)
{
void *ptr = calloc(nmemb, size);
if (!ptr)
error_msg_and_die(memory_exhausted);
return ptr;
}
#endif
#if defined BB_NFSMOUNT || defined BB_LS || defined BB_SH || \
defined BB_WGET || defined BB_DPKG_DEB || defined BB_TAR || \
defined BB_LN
# ifndef DMALLOC
extern char * xstrdup (const char *s) {
char *t;
if (s == NULL)
return NULL;
t = strdup (s);
if (t == NULL)
error_msg_and_die(memory_exhausted);
return t;
}
# endif
#endif
#if defined BB_NFSMOUNT
extern char * xstrndup (const char *s, int n) {
char *t;
if (s == NULL)
error_msg_and_die("xstrndup bug");
t = xmalloc(++n);
return safe_strncpy(t,s,n);
}
#endif
#if defined BB_IFCONFIG || defined BB_ROUTE || defined BB_NFSMOUNT || \
defined BB_FEATURE_MOUNT_LOOP
/* Like strncpy but make sure the resulting string is always 0 terminated. */
extern char * safe_strncpy(char *dst, const char *src, size_t size)
{
dst[size-1] = '\0';
return strncpy(dst, src, size-1);
}
#endif
#if (__GLIBC__ < 2) && (defined BB_SYSLOGD || defined BB_INIT)
extern int vdprintf(int d, const char *format, va_list ap)
{
char buf[BUF_SIZE];
int len;
len = vsprintf(buf, format, ap);
return write(d, buf, len);
}
#endif /* BB_SYSLOGD */
#if defined BB_FEATURE_MOUNT_LOOP
#include <fcntl.h>
#include "loop.h" /* Pull in loop device support */
extern int del_loop(const char *device)
{
int fd;
if ((fd = open(device, O_RDONLY)) < 0) {
perror_msg("%s", device);
return (FALSE);
}
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
perror_msg("ioctl: LOOP_CLR_FD");
return (FALSE);
}
close(fd);
return (TRUE);
}
extern int set_loop(const char *device, const char *file, int offset,
int *loopro)
{
struct loop_info loopinfo;
int fd, ffd, mode;
mode = *loopro ? O_RDONLY : O_RDWR;
if ((ffd = open(file, mode)) < 0 && !*loopro
&& (errno != EROFS || (ffd = open(file, mode = O_RDONLY)) < 0)) {
perror_msg("%s", file);
return 1;
}
if ((fd = open(device, mode)) < 0) {
close(ffd);
perror_msg("%s", device);
return 1;
}
*loopro = (mode == O_RDONLY);
memset(&loopinfo, 0, sizeof(loopinfo));
safe_strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
loopinfo.lo_offset = offset;
loopinfo.lo_encrypt_key_size = 0;
if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
perror_msg("ioctl: LOOP_SET_FD");
close(fd);
close(ffd);
return 1;
}
if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
(void) ioctl(fd, LOOP_CLR_FD, 0);
perror_msg("ioctl: LOOP_SET_STATUS");
close(fd);
close(ffd);
return 1;
}
close(fd);
close(ffd);
return 0;
}
extern char *find_unused_loop_device(void)
{
char dev[20];
int i, fd;
struct stat statbuf;
struct loop_info loopinfo;
for (i = 0; i <= 7; i++) {
sprintf(dev, "/dev/loop%d", i);
if (stat(dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
if ((fd = open(dev, O_RDONLY)) >= 0) {
if (ioctl(fd, LOOP_GET_STATUS, &loopinfo) == -1) {
if (errno == ENXIO) { /* probably free */
close(fd);
return strdup(dev);
}
}
close(fd);
}
}
}
return NULL;
}
#endif /* BB_FEATURE_MOUNT_LOOP */
#if defined BB_MOUNT || defined BB_DF || ( defined BB_UMOUNT && ! defined BB_MTAB)
extern int find_real_root_device_name(char* name)
{
DIR *dir;
struct dirent *entry;
struct stat statBuf, rootStat;
char fileName[BUFSIZ];
if (stat("/", &rootStat) != 0) {
error_msg("could not stat '/'");
return( FALSE);
}
dir = opendir("/dev");
if (!dir) {
error_msg("could not open '/dev'");
return( FALSE);
}
while((entry = readdir(dir)) != NULL) {
/* Must skip ".." since that is "/", and so we
* would get a false positive on ".." */
if (strcmp(entry->d_name, "..") == 0)
continue;
snprintf( fileName, strlen(name)+1, "/dev/%s", entry->d_name);
if (stat(fileName, &statBuf) != 0)
continue;
/* Some char devices have the same dev_t as block
* devices, so make sure this is a block device */
if (! S_ISBLK(statBuf.st_mode))
continue;
if (statBuf.st_rdev == rootStat.st_rdev) {
strcpy(name, fileName);
return ( TRUE);
}
}
return( FALSE);
}
#endif
/* get_line_from_file() - This function reads an entire line from a text file
* up to a newline. It returns a malloc'ed char * which must be stored and
* free'ed by the caller. */
extern char *get_line_from_file(FILE *file)
{
static const int GROWBY = 80; /* how large we will grow strings by */
int ch;
int idx = 0;
char *linebuf = NULL;
int linebufsz = 0;
while (1) {
ch = fgetc(file);
if (ch == EOF)
break;
/* grow the line buffer as necessary */
while (idx > linebufsz-2)
linebuf = xrealloc(linebuf, linebufsz += GROWBY);
linebuf[idx++] = (char)ch;
if ((char)ch == '\n')
break;
}
if (idx == 0)
return NULL;
linebuf[idx] = 0;
return linebuf;
}
#if defined BB_CAT
extern void print_file(FILE *file)
{
int c;
while ((c = getc(file)) != EOF)
putc(c, stdout);
fclose(file);
fflush(stdout);
}
extern int print_file_by_name(char *filename)
{
FILE *file;
if ((file = wfopen(filename, "r")) == NULL)
return FALSE;
print_file(file);
return TRUE;
}
#endif /* BB_CAT */
#if defined BB_ECHO || defined BB_SH || defined BB_TR
char process_escape_sequence(char **ptr)
{
static const char charmap[] = {
'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
'\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
const char *p;
char *q;
int num_digits;
unsigned int n;
n = 0;
q = *ptr;
for ( num_digits = 0 ; num_digits < 3 ; ++num_digits) {
if ((*q < '0') || (*q > '7')) { /* not a digit? */
break;
}
n = n * 8 + (*q++ - '0');
}
if (num_digits == 0) { /* mnemonic escape sequence? */
for (p=charmap ; *p ; p++) {
if (*p == *q) {
q++;
break;
}
}
n = *(p+(sizeof(charmap)/2));
}
/* doesn't hurt to fall through to here from mnemonic case */
if (n > UCHAR_MAX) { /* is octal code too big for a char? */
n /= 8; /* adjust value and */
--q; /* back up one char */
}
*ptr = q;
return (char) n;
}
#endif
#if defined BB_BASENAME || defined BB_LN || defined BB_SH || defined BB_INIT || \
! defined BB_FEATURE_USE_DEVPS_PATCH || defined BB_WGET
char *get_last_path_component(char *path)
{
char *s=path+strlen(path)-1;
/* strip trailing slashes */
while (s != path && *s == '/') {
*s-- = '\0';
}
/* find last component */
s = strrchr(path, '/');
if (s == NULL || s[1] == '\0')
return path;
else
return s+1;
}
#endif
#if defined BB_GREP || defined BB_SED
#include <regex.h>
void xregcomp(regex_t *preg, const char *regex, int cflags)
{
int ret;
if ((ret = regcomp(preg, regex, cflags)) != 0) {
int errmsgsz = regerror(ret, preg, NULL, 0);
char *errmsg = xmalloc(errmsgsz);
regerror(ret, preg, errmsg, errmsgsz);
error_msg_and_die("xregcomp: %s", errmsg);
}
}
#endif
#if defined BB_CAT || defined BB_HEAD || defined BB_WC
FILE *wfopen(const char *path, const char *mode)
{
FILE *fp;
if ((fp = fopen(path, mode)) == NULL) {
perror_msg("%s", path);
errno = 0;
}
return fp;
}
#endif
#if defined BB_HOSTNAME || defined BB_LOADACM || defined BB_MORE \
|| defined BB_SED || defined BB_SH || defined BB_TAR || defined BB_UNIQ \
|| defined BB_WC || defined BB_CMP || defined BB_SORT || defined BB_WGET \
|| defined BB_MOUNT || defined BB_ROUTE
FILE *xfopen(const char *path, const char *mode)
{
FILE *fp;
if ((fp = fopen(path, mode)) == NULL)
perror_msg_and_die("%s", path);
return fp;
}
#endif
static int applet_name_compare(const void *x, const void *y)
{
const char *name = x;
const struct BB_applet *applet = y;
return strcmp(name, applet->name);
}
extern size_t NUM_APPLETS;
struct BB_applet *find_applet_by_name(const char *name)
{
return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
applet_name_compare);
}
void run_applet_by_name(const char *name, int argc, char **argv)
{
/* Do a binary search to find the applet entry given the name. */
if ((applet_using = find_applet_by_name(name)) != NULL) {
applet_name = applet_using->name;
if (argv[1] && strcmp(argv[1], "--help") == 0)
show_usage();
exit((*(applet_using->main)) (argc, argv));
}
}
#if defined BB_DD || defined BB_TAIL || defined BB_STTY
unsigned long parse_number(const char *numstr,
const struct suffix_mult *suffixes)
{
const struct suffix_mult *sm;
unsigned long int ret;
int len;
char *end;
ret = strtoul(numstr, &end, 10);
if (numstr == end)
error_msg_and_die("invalid number `%s'", numstr);
while (end[0] != '\0') {
sm = suffixes;
while ( sm != 0 ) {
if(sm->suffix) {
len = strlen(sm->suffix);
if (strncmp(sm->suffix, end, len) == 0) {
ret *= sm->mult;
end += len;
break;
}
sm++;
} else
sm = 0;
}
if (sm == 0)
error_msg_and_die("invalid number `%s'", numstr);
}
return ret;
}
#endif
#if defined BB_DD || defined BB_NC || defined BB_TAIL
ssize_t safe_read(int fd, void *buf, size_t count)
{
ssize_t n;
do {
n = read(fd, buf, count);
} while (n < 0 && errno == EINTR);
return n;
}
#endif
#ifdef BB_FEATURE_HUMAN_READABLE
const char *format(unsigned long val, unsigned long hr)
{
static const char strings[] = { '0', 0, 'k', 0, 'M', 0, 'G', 0 };
static const char fmt[] = "%lu";
static const char fmt_u[] = "%lu.%lu%s";
static char str[10];
unsigned long frac __attribute__ ((unused)); /* 'may be uninitialized' warning is ok */
const char *u;
const char *f;
#if 1
if(val == 0) { /* This may be omitted to reduce size */
return strings; /* at the cost of speed. */
}
#endif
u = strings;
f = fmt;
if (hr) {
val /= hr;
} else {
while ((val >= KILOBYTE) && (*u != 'G')) {
f = fmt_u;
u += 2;
frac = (((val % KILOBYTE) * 10) + (KILOBYTE/2)) / KILOBYTE;
val /= KILOBYTE;
if (frac >= 10) { /* We need to round up here. */
++val;
frac = 0;
}
}
}
/* If f==fmt then 'frac' and 'u' are ignored and need not be set. */
snprintf(str, sizeof(str), f, val, frac, u);
return str;
}
#endif
#if defined(BB_GREP) || defined(BB_HOSTNAME) || defined(BB_SED) || defined(BB_TAR) || defined(BB_WGET) || defined(BB_XARGS)
void chomp(char *s)
{
size_t len = strlen(s);
if (len == 0)
return;
if (s[len-1] == '\n')
s[len-1] = '\0';
}
#endif
/* END CODE */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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