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busybox/utility.c
Eric Andersen 0460ff2e5d Stuf
1999-10-25 23:32:44 +00:00

817 lines
16 KiB
C
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/*
* 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"
#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>
/* volatile so gcc knows this is the enod of the line */
volatile 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);
}
#if defined (BB_INIT) || defined (BB_PS)
/* 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> }
*/
int
get_kernel_revision()
{
FILE *file;
int major=0, minor=0, patch=0;
char* filename="/proc/sys/kernel/osrelease";
file = fopen(filename,"r");
if (file == NULL) {
perror(filename);
return( 0);
}
fscanf(file,"%d.%d.%d",&major,&minor,&patch);
fclose(file);
return major*65536 + minor*256 + patch;
}
#endif
#if defined (BB_CP) || defined (BB_MV)
/*
* Return TRUE if a fileName is a directory.
* Nonexistant files return FALSE.
*/
int isDirectory(const char *name)
{
struct stat statBuf;
if (stat(name, &statBuf) < 0)
return FALSE;
if (S_ISDIR(statBuf.st_mode))
return TRUE;
return(FALSE);
}
/*
* 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 indicted if the attributes cannot
* be set.)
* -Erik Andersen
*/
int
copyFile( const char *srcName, const char *destName,
int setModes, int followLinks)
{
int rfd;
int wfd;
int rcc;
int result;
char buf[BUF_SIZE];
struct stat srcStatBuf;
struct stat dstStatBuf;
struct utimbuf times;
if (followLinks == FALSE)
result = stat(srcName, &srcStatBuf);
else
result = lstat(srcName, &srcStatBuf);
if (result < 0) {
perror(srcName);
return FALSE;
}
if (followLinks == FALSE)
result = stat(destName, &dstStatBuf);
else
result = lstat(destName, &dstStatBuf);
if (result < 0) {
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 */
if (mkdir(destName, 0777777 ^ umask(0))) {
perror(destName);
return (FALSE);
}
} else if (S_ISLNK(srcStatBuf.st_mode)) {
char *link_val;
int link_size;
//fprintf(stderr, "copying link %s to %s\n", srcName, destName);
link_val = (char *) alloca(PATH_MAX + 2);
link_size = readlink(srcName, link_val, PATH_MAX + 1);
if (link_size < 0) {
perror(srcName);
return (FALSE);
}
link_val[link_size] = '\0';
link_size = symlink(link_val, destName);
if (link_size != 0) {
perror(destName);
return (FALSE);
}
} else if (S_ISFIFO(srcStatBuf.st_mode)) {
//fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
if (mkfifo(destName, 644)) {
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)) {
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 = creat(destName, 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) {
//fprintf(stderr, "Setting permissions for %s\n", destName);
chmod(destName, srcStatBuf.st_mode);
if (followLinks == TRUE)
chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
else
lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
times.actime = srcStatBuf.st_atime;
times.modtime = srcStatBuf.st_mtime;
utime(destName, &times);
}
return TRUE;
error_exit:
perror(destName);
close(rfd);
close(wfd);
return FALSE;
}
#endif
#ifdef BB_TAR
/*
* 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];
strcpy(buf, "----------");
/*
* Fill in the file type.
*/
if (S_ISDIR(mode))
buf[0] = 'd';
if (S_ISCHR(mode))
buf[0] = 'c';
if (S_ISBLK(mode))
buf[0] = 'b';
if (S_ISFIFO(mode))
buf[0] = 'p';
if (S_ISLNK(mode))
buf[0] = 'l';
if (S_ISSOCK(mode))
buf[0] = 's';
/*
* Now fill in the normal file permissions.
*/
if (mode & S_IRUSR)
buf[1] = 'r';
if (mode & S_IWUSR)
buf[2] = 'w';
if (mode & S_IXUSR)
buf[3] = 'x';
if (mode & S_IRGRP)
buf[4] = 'r';
if (mode & S_IWGRP)
buf[5] = 'w';
if (mode & S_IXGRP)
buf[6] = 'x';
if (mode & S_IROTH)
buf[7] = 'r';
if (mode & S_IWOTH)
buf[8] = 'w';
if (mode & S_IXOTH)
buf[9] = 'x';
/*
* Finally fill in magic stuff like suid and sticky text.
*/
if (mode & S_ISUID)
buf[3] = ((mode & S_IXUSR) ? 's' : 'S');
if (mode & S_ISGID)
buf[6] = ((mode & S_IXGRP) ? 's' : 'S');
if (mode & S_ISVTX)
buf[9] = ((mode & S_IXOTH) ? 't' : 'T');
return buf;
}
/*
* Get the time string to be used for a file.
* This is down to the minute for new files, but only the date for old files.
* The string is returned from a static buffer, and so is overwritten for
* 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;
}
/*
* 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;
}
/*
* 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
#if defined (BB_CHOWN) || defined (BB_CP) || defined (BB_FIND) || defined (BB_LS)
/*
* 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...
*/
int
recursiveAction(const char *fileName, int recurse, int followLinks, int depthFirst,
int (*fileAction) (const char *fileName, struct stat* statbuf),
int (*dirAction) (const char *fileName, struct stat* statbuf))
{
int status;
struct stat statbuf;
struct dirent *next;
if (followLinks == FALSE)
status = stat(fileName, &statbuf);
else
status = lstat(fileName, &statbuf);
if (status < 0) {
perror(fileName);
return (FALSE);
}
if (recurse == FALSE) {
if (S_ISDIR(statbuf.st_mode)) {
if (dirAction != NULL)
return (dirAction(fileName, &statbuf));
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);
if (status == FALSE) {
perror(fileName);
return (FALSE);
}
}
while ((next = readdir(dir)) != NULL) {
char nextFile[NAME_MAX];
if ((strcmp(next->d_name, "..") == 0)
|| (strcmp(next->d_name, ".") == 0)) {
continue;
}
sprintf(nextFile, "%s/%s", fileName, next->d_name);
status =
recursiveAction(nextFile, TRUE, followLinks, depthFirst,
fileAction, dirAction);
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);
if (status == FALSE) {
perror(fileName);
return (FALSE);
}
}
} else {
if (fileAction == NULL)
return (TRUE);
else
return (fileAction(fileName, &statbuf));
}
return (TRUE);
}
#endif
#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 void createPath (const char *name, int mode)
{
char *cp;
char *cpOld;
char buf[NAME_MAX];
strcpy (buf, name);
cp = strchr (buf, '/');
while (cp) {
cpOld = cp;
cp = strchr (cp + 1, '/');
*cpOld = '\0';
if (mkdir (buf, cp ? 0777 : mode) == 0)
printf ("Directory \"%s\" created\n", buf);
*cpOld = '/';
}
}
#endif
#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
#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_PS)
/* Use this to avoid needing the glibc NSS stuff
* This uses storage buf to hold things.
* */
uid_t
my_getid(const char *filename, char *name, uid_t id)
{
FILE *file;
char *rname, *start, *end, buf[128];
uid_t rid;
file=fopen(filename,"r");
if (file == NULL) {
perror(filename);
return (-1);
}
while (fgets (buf, 128, file) != NULL) {
if (buf[0] == '#')
continue;
start = buf;
end = strchr (start, ':');
if (end == NULL)
continue;
*end = '\0';
rname = start;
start = end + 1;
end = strchr (start, ':');
if (end == NULL)
continue;
start = end + 1;
rid = (uid_t) strtol (start, &end, 10);
if (end == start)
continue;
if (name) {
if (0 == strcmp(rname, name))
return( rid);
}
if ( id != -1 && id == rid ) {
strncpy(name, rname, 8);
return( TRUE);
}
}
fclose(file);
return (-1);
}
uid_t
my_getpwnam(char *name)
{
return my_getid("/etc/passwd", name, -1);
}
gid_t
my_getgrnam(char *name)
{
return my_getid("/etc/group", name, -1);
}
void
my_getpwuid(char* name, uid_t uid)
{
my_getid("/etc/passwd", name, uid);
}
void
my_getgrgid(char* group, gid_t gid)
{
my_getid("/etc/group", group, gid);
}
#endif
#if !defined BB_REGEXP && (defined BB_GREP || defined BB_FIND )
/* 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 a few lines down...
* -Erik Andersen
*/
extern int find_match(char *haystack, char *needle, int ignoreCase)
{
if (ignoreCase == FALSE) {
haystack = strstr (haystack, needle);
if (haystack == NULL)
return FALSE;
return TRUE;
} else {
int i;
char needle1[BUF_SIZE];
char haystack1[BUF_SIZE];
strncpy( haystack1, haystack, sizeof(haystack1));
strncpy( needle1, needle, sizeof(needle1));
for( i=0; i<sizeof(haystack1) && haystack1[i]; i++)
haystack1[i]=tolower( haystack1[i]);
for( i=0; i<sizeof(needle1) && needle1[i]; i++)
needle1[i]=tolower( needle1[i]);
haystack = strstr (haystack1, needle1);
if (haystack == NULL)
return FALSE;
return TRUE;
}
}
#endif
#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
/* END CODE */
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