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busybox/utility.c
Eric Andersen a44790f539 Better cross libc support. 
-Erik
2000-06-28 20:11:28 +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 "internal.h"
#if defined (BB_CHMOD_CHOWN_CHGRP) \
|| defined (BB_CP_MV) \
|| defined (BB_FIND) \
|| defined (BB_LS) \
|| defined (BB_INSMOD)
/* same conditions as recursiveAction */
#define bb_need_name_too_long
#endif
#define bb_need_memory_exhausted
#define BB_DECLARE_EXTERN
#include "messages.c"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <time.h>
#include <utime.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/utsname.h> /* for uname(2) */
#if defined BB_FEATURE_MOUNT_LOOP
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/loop.h>
#endif
/* 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_FEATURE_USE_PROCFS && defined BB_FEATURE_USE_DEVPS_PATCH
//#error Sorry, but busybox can't use both /proc and /dev/ps at the same time -- Pick one and try again.
#error "Sorry, but busybox can't use both /proc and /dev/ps at the same time -- Pick one and try again."
#endif
#if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF
# if defined BB_FEATURE_USE_PROCFS
const char mtab_file[] = "/proc/mounts";
# else
# 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
# error With (BB_MOUNT||BB_UMOUNT||BB_DF) defined, you must define either BB_MTAB or ( BB_FEATURE_USE_PROCFS | BB_FEATURE_USE_DEVPS_PATCH)
# endif
# endif
# endif
#endif
extern void usage(const char *usage)
{
fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
BB_VER, BB_BT);
fprintf(stderr, "Usage: %s\n", usage);
exit FALSE;
}
extern void errorMsg(const char *s, ...)
{
va_list p;
va_start(p, s);
fflush(stdout);
vfprintf(stderr, s, p);
va_end(p);
fflush(stderr);
}
extern void fatalError(const char *s, ...)
{
va_list p;
va_start(p, s);
fflush(stdout);
vfprintf(stderr, s, p);
va_end(p);
fflush(stderr);
exit( FALSE);
}
#if defined BB_INIT
/* 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;
int major = 0, minor = 0, patch = 0;
if (uname(&name) == -1) {
perror("cannot get system information");
return (0);
}
sscanf(name.version, "%d.%d.%d", &major, &minor, &patch);
return major * 65536 + minor * 256 + patch;
}
#endif /* BB_INIT */
#if defined BB_FREE || defined BB_INIT || defined BB_UNAME || defined BB_UPTIME
#include <sys/syscall.h>
#include <linux/unistd.h>
_syscall1(int, sysinfo, struct sysinfo *, info);
#endif /* BB_INIT */
#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)
/*
* Return TRUE if a fileName is a directory.
* Nonexistant files return FALSE.
*/
int isDirectory(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_CP_MV)
/*
* 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
copyFile(const char *srcName, const char *destName,
int setModes, int followLinks, int forceFlag)
{
int rfd;
int wfd;
int rcc;
int status;
char buf[BUF_SIZE];
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(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)) {
fprintf(stderr, "Copying file \"%s\" to itself\n", 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(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(srcName);
return FALSE;
}
link_val[link_size] = '\0';
status = symlink(link_val, destName);
if (status < 0) {
perror(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(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(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(srcName);
return FALSE;
}
wfd =
open(destName, O_WRONLY | O_CREAT | O_TRUNC,
srcStatBuf.st_mode);
if (wfd < 0) {
perror(destName);
close(rfd);
return FALSE;
}
while ((rcc = read(rfd, buf, sizeof(buf))) > 0) {
if (fullWrite(wfd, buf, rcc) < 0)
goto error_exit;
}
if (rcc < 0) {
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(destName);
exit FALSE;
}
if (chmod(destName, srcStatBuf.st_mode) < 0) {
perror(destName);
exit FALSE;
}
times.actime = srcStatBuf.st_atime;
times.modtime = srcStatBuf.st_mtime;
if (utime(destName, &times) < 0) {
perror(destName);
exit FALSE;
}
}
return TRUE;
error_exit:
perror(destName);
close(rfd);
close(wfd);
return FALSE;
}
#endif /* BB_CP_MV */
#if defined BB_TAR || defined BB_LS
#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
};
#define MODE1 "rwxrwxrwx"
#define MODE0 "---------"
#define SMODE1 "..s..s..t"
#define 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 *modeString(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
/*
* Return the standard ls-like time string from a time_t
* This is static and so is overwritten on each call.
*/
const char *timeString(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 */
#if defined BB_TAR || 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 fullWrite(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 /* BB_TAR || BB_CP_MV */
#if defined BB_TAR || defined BB_TAIL
/*
* 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 fullRead(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 */
#if defined (BB_CHMOD_CHOWN_CHGRP) \
|| defined (BB_CP_MV) \
|| defined (BB_FIND) \
|| defined (BB_INSMOD) \
|| 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).
*
* Unfortunatly, 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 recursiveAction(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(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;
dir = opendir(fileName);
if (!dir) {
perror(fileName);
return FALSE;
}
if (dirAction != NULL && depthFirst == FALSE) {
status = dirAction(fileName, &statbuf, userData);
if (status == FALSE) {
perror(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) {
fprintf(stderr, name_too_long, "ftw");
return FALSE;
}
memset(nextFile, 0, sizeof(nextFile));
sprintf(nextFile, "%s/%s", fileName, next->d_name);
status =
recursiveAction(nextFile, TRUE, followLinks, depthFirst,
fileAction, dirAction, userData);
if (status < 0) {
closedir(dir);
return FALSE;
}
}
status = closedir(dir);
if (status < 0) {
perror(fileName);
return FALSE;
}
if (dirAction != NULL && depthFirst == TRUE) {
status = dirAction(fileName, &statbuf, userData);
if (status == FALSE) {
perror(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 createPath(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(buf);
return FALSE;
}
*cpOld = '/';
}
return TRUE;
}
#endif /* BB_TAR || BB_MKDIR */
#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_MKDIR)
/* [ugoa]{+|-|=}[rwxst] */
extern int parse_mode(const char *s, mode_t * theMode)
{
mode_t andMode =
S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
mode_t orMode = 0;
mode_t mode = 0;
mode_t groups = 0;
char type;
char c;
do {
for (;;) {
switch (c = *s++) {
case '\0':
return -1;
case 'u':
groups |= S_ISUID | S_IRWXU;
continue;
case 'g':
groups |= S_ISGID | S_IRWXG;
continue;
case 'o':
groups |= S_IRWXO;
continue;
case 'a':
groups |= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
continue;
case '+':
case '=':
case '-':
type = c;
if (groups == 0) /* The default is "all" */
groups |=
S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
break;
default:
if (isdigit(c) && c >= '0' && c <= '7' &&
mode == 0 && groups == 0) {
*theMode = strtol(--s, NULL, 8);
return (TRUE);
} else
return (FALSE);
}
break;
}
while ((c = *s++) != '\0') {
switch (c) {
case ',':
break;
case 'r':
mode |= S_IRUSR | S_IRGRP | S_IROTH;
continue;
case 'w':
mode |= S_IWUSR | S_IWGRP | S_IWOTH;
continue;
case 'x':
mode |= S_IXUSR | S_IXGRP | S_IXOTH;
continue;
case 's':
mode |= S_IXGRP | S_ISUID | S_ISGID;
continue;
case 't':
mode |= 0;
continue;
default:
*theMode &= andMode;
*theMode |= orMode;
return (TRUE);
}
break;
}
switch (type) {
case '=':
andMode &= ~(groups);
/* fall through */
case '+':
orMode |= mode & groups;
break;
case '-':
andMode &= ~(mode & groups);
orMode &= andMode;
break;
}
} while (c == ',');
*theMode &= andMode;
*theMode |= orMode;
return (TRUE);
}
#endif /* BB_CHMOD_CHOWN_CHGRP || BB_MKDIR */
#if defined BB_CHMOD_CHOWN_CHGRP || defined BB_PS || defined BB_LS || defined BB_TAR || defined BB_ID
/* This parses 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 or wanted for embedded
* systems.
*
* /etc/passwd entries look like this:
* root:x:0:0:root:/root:/bin/bash
* and /etc/group entries look like this:
* root:x:0:
*
* This uses buf as storage to hold things.
*
*/
unsigned long my_getid(const char *filename, char *name, unsigned long id, unsigned long *gid)
{
FILE *file;
char *rname, *start, *end, buf[128];
unsigned long rid;
unsigned long rgid = 0;
file = fopen(filename, "r");
if (file == NULL) {
/* Do not complain. It is ok for /etc/passwd and
* friends to be missing... */
return (-1);
}
while (fgets(buf, 128, file) != NULL) {
if (buf[0] == '#')
continue;
/* username/group name */
start = buf;
end = strchr(start, ':');
if (end == NULL)
continue;
*end = '\0';
rname = start;
/* password */
start = end + 1;
end = strchr(start, ':');
if (end == NULL)
continue;
/* uid in passwd, gid in group */
start = end + 1;
rid = (unsigned long) strtol(start, &end, 10);
if (end == start)
continue;
/* gid in passwd */
start = end + 1;
rgid = (unsigned long) strtol(start, &end, 10);
if (name) {
if (0 == strcmp(rname, name)) {
if (gid) *gid = rgid;
fclose(file);
return (rid);
}
}
if (id != -1 && id == rid) {
strncpy(name, rname, 8);
if (gid) *gid = rgid;
fclose(file);
return (TRUE);
}
}
fclose(file);
return (-1);
}
/* returns a uid given a username */
unsigned long my_getpwnam(char *name)
{
return my_getid("/etc/passwd", name, -1, NULL);
}
/* returns a gid given a group name */
unsigned long my_getgrnam(char *name)
{
return my_getid("/etc/group", name, -1, NULL);
}
/* gets a username given a uid */
void my_getpwuid(char *name, unsigned long uid)
{
my_getid("/etc/passwd", name, uid, NULL);
}
/* gets a groupname given a gid */
void my_getgrgid(char *group, unsigned long gid)
{
my_getid("/etc/group", group, gid, NULL);
}
/* gets a gid given a user name */
unsigned long my_getpwnamegid(char *name)
{
unsigned long gid;
my_getid("/etc/passwd", name, -1, &gid);
return gid;
}
#endif /* BB_CHMOD_CHOWN_CHGRP || BB_PS || BB_LS || BB_TAR || BB_ID */
#if (defined BB_CHVT) || (defined BB_DEALLOCVT)
#include <linux/kd.h>
#include <sys/ioctl.h>
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;
fprintf(stderr,
"Couldnt get a file descriptor referring to the console\n");
return -1; /* total failure */
}
#endif /* BB_CHVT || BB_DEALLOCVT */
#if !defined BB_REGEXP && (defined BB_GREP || defined BB_SED)
/* Do a case insensitive strstr() */
char *stristr(char *haystack, const char *needle)
{
int len = strlen(needle);
while (*haystack) {
if (!strncasecmp(haystack, needle, len))
break;
haystack++;
}
if (!(*haystack))
haystack = NULL;
return haystack;
}
/* This tries to find a needle in a haystack, but does so by
* only trying to match literal strings (look 'ma, no regexps!)
* This is short, sweet, and carries _very_ little baggage,
* unlike its beefier cousin in regexp.c
* -Erik Andersen
*/
extern int find_match(char *haystack, char *needle, int ignoreCase)
{
if (ignoreCase == FALSE)
haystack = strstr(haystack, needle);
else
haystack = stristr(haystack, needle);
if (haystack == NULL)
return FALSE;
return TRUE;
}
/* This performs substitutions after a string match has been found. */
extern int replace_match(char *haystack, char *needle, char *newNeedle,
int ignoreCase)
{
int foundOne = 0;
char *where, *slider, *slider1, *oldhayStack;
if (ignoreCase == FALSE)
where = strstr(haystack, needle);
else
where = stristr(haystack, needle);
if (strcmp(needle, newNeedle) == 0)
return FALSE;
oldhayStack = (char *) xmalloc((unsigned) (strlen(haystack)));
while (where != NULL) {
foundOne++;
strcpy(oldhayStack, haystack);
for (slider = haystack, slider1 = oldhayStack; slider != where;
slider++, slider1++);
*slider = 0;
haystack = strcat(haystack, newNeedle);
slider1 += strlen(needle);
haystack = strcat(haystack, slider1);
where = strstr(slider, needle);
}
free(oldhayStack);
if (foundOne > 0)
return TRUE;
else
return FALSE;
}
#endif /* ! BB_REGEXP && (BB_GREP || BB_SED) */
#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
/*
* 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 *findMountPoint(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(mountEntry->mnt_fsname, "none") == 0) {
continue;
}
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_DD || defined BB_TAIL
/*
* Read a number with a possible multiplier.
* Returns -1 if the number format is illegal.
*/
extern long getNum(const char *cp)
{
long value;
if (!isDecimal(*cp))
return -1;
value = 0;
while (isDecimal(*cp))
value = value * 10 + *cp++ - '0';
switch (*cp++) {
case 'M':
case 'm': /* `tail' uses it traditionally */
value *= 1048576;
break;
case 'k':
value *= 1024;
break;
case 'b':
value *= 512;
break;
case 'w':
value *= 2;
break;
case '\0':
return value;
default:
return -1;
}
if (*cp)
return -1;
return value;
}
#endif /* BB_DD || BB_TAIL */
#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>
#endif
#if defined BB_FEATURE_USE_DEVPS_PATCH
/* findPidByName()
*
* 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* findPidByName( 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)
fatalError( "open failed for `%s': %s\n", device, strerror (errno));
/* Find out how many processes there are */
if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
fatalError( "\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
/* 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*) calloc( 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)
fatalError( "\nDEVPS_GET_PID_LIST: %s\n", strerror (errno));
/* Now search for a match */
for (i=1; 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)
fatalError( "\nDEVPS_GET_PID_INFO: %s\n", strerror (errno));
/* 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=realloc( pidList, sizeof(pid_t) * (j+2));
if (pidList==NULL)
fatalError(memory_exhausted, "");
pidList[j++]=info.pid;
}
}
if (pidList)
pidList[j]=0;
/* Free memory */
free( pid_array);
/* close device */
if (close (fd) != 0)
fatalError( "close failed for `%s': %s\n",device, strerror (errno));
return pidList;
}
#else /* BB_FEATURE_USE_DEVPS_PATCH */
#if ! defined BB_FEATURE_USE_PROCFS
#error Sorry, I depend on the /proc filesystem right now.
#endif
/* findPidByName()
*
* 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* findPidByName( char* pidName)
{
DIR *dir;
struct dirent *next;
pid_t* pidList=NULL;
int i=0;
dir = opendir("/proc");
if (!dir)
fatalError( "Cannot open /proc: %s\n", strerror (errno));
while ((next = readdir(dir)) != NULL) {
FILE *status;
char filename[256];
char buffer[256];
char* p;
/* If it isn't a number, we don't want it */
if (!isdigit(*next->d_name))
continue;
/* Now open the status file */
sprintf(filename, "/proc/%s/status", next->d_name);
status = fopen(filename, "r");
if (!status) {
continue;
}
fgets(buffer, 256, status);
fclose(status);
/* Make sure we only match on the process name */
p=buffer+5; /* Skip the name */
while ((p)++) {
if (*p==0 || *p=='\n') {
*p='\0';
break;
}
}
p=buffer+6; /* Skip the "Name:\t" */
if ((strstr(p, pidName) != NULL)
&& (strlen(pidName) == strlen(p))) {
pidList=realloc( pidList, sizeof(pid_t) * (i+2));
if (pidList==NULL)
fatalError(memory_exhausted, "");
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 )) */
/* this should really be farmed out to libbusybox.a */
extern void *xmalloc(size_t size)
{
void *cp = malloc(size);
if (cp == NULL)
fatalError(memory_exhausted, "");
return cp;
}
#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
extern int del_loop(const char *device)
{
int fd;
if ((fd = open(device, O_RDONLY)) < 0) {
perror(device);
return (FALSE);
}
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
perror("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(file);
return 1;
}
if ((fd = open(device, mode)) < 0) {
close(ffd);
perror(device);
return 1;
}
*loopro = (mode == O_RDONLY);
memset(&loopinfo, 0, sizeof(loopinfo));
strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
loopinfo.lo_name[LO_NAME_SIZE - 1] = 0;
loopinfo.lo_offset = offset;
loopinfo.lo_encrypt_key_size = 0;
if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
perror("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("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) {
errorMsg("could not stat '/'\n");
return( FALSE);
}
dir = opendir("/dev");
if (!dir) {
errorMsg("could not open '/dev'\n");
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;
sprintf( fileName, "/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
const unsigned int CSTRING_BUFFER_LENGTH = 1024;
/* recursive parser that returns cstrings of arbitrary length
* from a FILE*
*/
static char *
cstring_alloc(FILE* f, int depth)
{
char *cstring;
char buffer[CSTRING_BUFFER_LENGTH];
int target = CSTRING_BUFFER_LENGTH * depth;
int c, i, len, size;
/* fill buffer */
i = 0;
while ((c = fgetc(f)) != EOF) {
buffer[i] = (char) c;
if (buffer[i++] == 0x0a) { break; }
if (i == CSTRING_BUFFER_LENGTH) { break; }
}
len = i;
/* recurse or malloc? */
if (len == CSTRING_BUFFER_LENGTH) {
cstring = cstring_alloc(f, (depth + 1));
} else {
/* [special case] EOF */
if ((depth | len) == 0) { return NULL; }
/* malloc */
size = target + len + 1;
cstring = malloc(size);
if (!cstring) { return NULL; }
cstring[size - 1] = 0;
}
/* copy buffer */
if (cstring) {
memcpy(&cstring[target], buffer, len);
}
return cstring;
}
/*
* wrapper around recursive cstring_alloc
* it's the caller's responsibility to free the cstring
*/
char *
cstring_lineFromFile(FILE *f)
{
return cstring_alloc(f, 0);
}
/* END CODE */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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