mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-12 14:05:40 +00:00
cf8c9cf7b9
-Erik
873 lines
18 KiB
C
873 lines
18 KiB
C
/*
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* Utility routines.
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*
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* Copyright (C) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <time.h>
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#include <utime.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <ctype.h>
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#ifdef BB_MTAB
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const char mtab_file[] = "/etc/mtab";
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#else
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#if defined BB_MOUNT || defined BB_UMOUNT || defined BB_DF
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const char mtab_file[] = "/proc/mounts";
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#endif
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#endif
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/* volatile so gcc knows this is the enod of the line */
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volatile void usage(const char *usage)
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{
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fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n", BB_VER, BB_BT);
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fprintf(stderr, "Usage: %s\n", usage);
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exit(FALSE);
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}
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#if defined (BB_INIT) || defined (BB_PS)
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/* Returns kernel version encoded as major*65536 + minor*256 + patch,
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* so, for example, to check if the kernel is greater than 2.2.11:
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* if (get_kernel_revision() <= 2*65536+2*256+11) { <stuff> }
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*/
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int
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get_kernel_revision()
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{
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FILE *file;
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int major=0, minor=0, patch=0;
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char* filename="/proc/sys/kernel/osrelease";
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file = fopen(filename,"r");
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if (file == NULL) {
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/* bummer, /proc must not be mounted... */
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return( 0);
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}
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fscanf(file,"%d.%d.%d",&major,&minor,&patch);
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fclose(file);
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return major*65536 + minor*256 + patch;
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}
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#endif
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#if defined (BB_CP) || defined (BB_MV)
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/*
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* Return TRUE if a fileName is a directory.
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* Nonexistant files return FALSE.
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*/
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int isDirectory(const char *name)
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{
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struct stat statBuf;
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if (stat(name, &statBuf) < 0)
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return FALSE;
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if (S_ISDIR(statBuf.st_mode))
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return TRUE;
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return(FALSE);
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}
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/*
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* Copy one file to another, while possibly preserving its modes, times,
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* and modes. Returns TRUE if successful, or FALSE on a failure with an
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* error message output. (Failure is not indicted if the attributes cannot
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* be set.)
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* -Erik Andersen
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*/
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int
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copyFile( const char *srcName, const char *destName,
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int setModes, int followLinks)
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{
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int rfd;
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int wfd;
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int rcc;
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int result;
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char buf[BUF_SIZE];
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struct stat srcStatBuf;
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struct stat dstStatBuf;
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struct utimbuf times;
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if (followLinks == FALSE)
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result = stat(srcName, &srcStatBuf);
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else
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result = lstat(srcName, &srcStatBuf);
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if (result < 0) {
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perror(srcName);
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return FALSE;
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}
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if (followLinks == FALSE)
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result = stat(destName, &dstStatBuf);
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else
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result = lstat(destName, &dstStatBuf);
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if (result < 0) {
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dstStatBuf.st_ino = -1;
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dstStatBuf.st_dev = -1;
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}
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if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
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(srcStatBuf.st_ino == dstStatBuf.st_ino)) {
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fprintf(stderr, "Copying file \"%s\" to itself\n", srcName);
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return FALSE;
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}
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if (S_ISDIR(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying directory %s to %s\n", srcName, destName);
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/* Make sure the directory is writable */
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if (mkdir(destName, 0777777 ^ umask(0))) {
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perror(destName);
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return (FALSE);
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}
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} else if (S_ISLNK(srcStatBuf.st_mode)) {
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char *link_val;
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int link_size;
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//fprintf(stderr, "copying link %s to %s\n", srcName, destName);
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link_val = (char *) alloca(PATH_MAX + 2);
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link_size = readlink(srcName, link_val, PATH_MAX + 1);
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if (link_size < 0) {
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perror(srcName);
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return (FALSE);
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}
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link_val[link_size] = '\0';
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link_size = symlink(link_val, destName);
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if (link_size != 0) {
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perror(destName);
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return (FALSE);
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}
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} else if (S_ISFIFO(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
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if (mkfifo(destName, 644)) {
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perror(destName);
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return (FALSE);
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}
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} else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode)
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|| S_ISSOCK (srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName);
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if (mknod(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev)) {
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perror(destName);
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return (FALSE);
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}
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} else if (S_ISREG(srcStatBuf.st_mode)) {
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//fprintf(stderr, "copying regular file %s to %s\n", srcName, destName);
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rfd = open(srcName, O_RDONLY);
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if (rfd < 0) {
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perror(srcName);
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return FALSE;
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}
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wfd = creat(destName, srcStatBuf.st_mode);
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if (wfd < 0) {
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perror(destName);
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close(rfd);
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return FALSE;
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}
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while ((rcc = read(rfd, buf, sizeof(buf))) > 0) {
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if (fullWrite(wfd, buf, rcc) < 0)
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goto error_exit;
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}
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if (rcc < 0) {
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goto error_exit;
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}
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close(rfd);
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if (close(wfd) < 0) {
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return FALSE;
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}
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}
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if (setModes == TRUE) {
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//fprintf(stderr, "Setting permissions for %s\n", destName);
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chmod(destName, srcStatBuf.st_mode);
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if (followLinks == TRUE)
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chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
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else
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lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
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times.actime = srcStatBuf.st_atime;
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times.modtime = srcStatBuf.st_mtime;
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utime(destName, ×);
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}
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return TRUE;
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error_exit:
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perror(destName);
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close(rfd);
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close(wfd);
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return FALSE;
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}
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#endif
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#ifdef BB_TAR
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/*
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* Return the standard ls-like mode string from a file mode.
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* This is static and so is overwritten on each call.
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*/
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const char *modeString(int mode)
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{
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static char buf[12];
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strcpy(buf, "----------");
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/*
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* Fill in the file type.
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*/
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if (S_ISDIR(mode))
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buf[0] = 'd';
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if (S_ISCHR(mode))
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buf[0] = 'c';
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if (S_ISBLK(mode))
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buf[0] = 'b';
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if (S_ISFIFO(mode))
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buf[0] = 'p';
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if (S_ISLNK(mode))
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buf[0] = 'l';
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if (S_ISSOCK(mode))
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buf[0] = 's';
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/*
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* Now fill in the normal file permissions.
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*/
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if (mode & S_IRUSR)
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buf[1] = 'r';
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if (mode & S_IWUSR)
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buf[2] = 'w';
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if (mode & S_IXUSR)
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buf[3] = 'x';
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if (mode & S_IRGRP)
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buf[4] = 'r';
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if (mode & S_IWGRP)
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buf[5] = 'w';
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if (mode & S_IXGRP)
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buf[6] = 'x';
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if (mode & S_IROTH)
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buf[7] = 'r';
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if (mode & S_IWOTH)
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buf[8] = 'w';
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if (mode & S_IXOTH)
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buf[9] = 'x';
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/*
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* Finally fill in magic stuff like suid and sticky text.
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*/
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if (mode & S_ISUID)
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buf[3] = ((mode & S_IXUSR) ? 's' : 'S');
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if (mode & S_ISGID)
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buf[6] = ((mode & S_IXGRP) ? 's' : 'S');
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if (mode & S_ISVTX)
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buf[9] = ((mode & S_IXOTH) ? 't' : 'T');
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return buf;
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}
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/*
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* Get the time string to be used for a file.
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* This is down to the minute for new files, but only the date for old files.
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* The string is returned from a static buffer, and so is overwritten for
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* each call.
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*/
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const char *timeString(time_t timeVal)
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{
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time_t now;
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char *str;
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static char buf[26];
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time(&now);
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str = ctime(&timeVal);
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strcpy(buf, &str[4]);
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buf[12] = '\0';
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if ((timeVal > now) || (timeVal < now - 365 * 24 * 60 * 60L)) {
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strcpy(&buf[7], &str[20]);
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buf[11] = '\0';
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}
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return buf;
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}
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/*
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* Write all of the supplied buffer out to a file.
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* This does multiple writes as necessary.
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* Returns the amount written, or -1 on an error.
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*/
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int fullWrite(int fd, const char *buf, int len)
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{
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int cc;
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int total;
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total = 0;
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while (len > 0) {
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cc = write(fd, buf, len);
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if (cc < 0)
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return -1;
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buf += cc;
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total += cc;
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len -= cc;
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}
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return total;
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}
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/*
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* Read all of the supplied buffer from a file.
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* This does multiple reads as necessary.
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* Returns the amount read, or -1 on an error.
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* A short read is returned on an end of file.
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*/
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int fullRead(int fd, char *buf, int len)
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{
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int cc;
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int total;
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total = 0;
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while (len > 0) {
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cc = read(fd, buf, len);
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if (cc < 0)
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return -1;
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if (cc == 0)
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break;
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buf += cc;
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total += cc;
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len -= cc;
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}
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return total;
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}
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#endif
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#if defined (BB_CHOWN) || defined (BB_CP) || defined (BB_FIND) || defined (BB_LS)
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/*
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* Walk down all the directories under the specified
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* location, and do something (something specified
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* by the fileAction and dirAction function pointers).
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*
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* Unfortunatly, while nftw(3) could replace this and reduce
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* code size a bit, nftw() wasn't supported before GNU libc 2.1,
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* and so isn't sufficiently portable to take over since glibc2.1
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* is so stinking huge.
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*/
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int
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recursiveAction(const char *fileName, int recurse, int followLinks, int depthFirst,
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int (*fileAction) (const char *fileName, struct stat* statbuf),
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int (*dirAction) (const char *fileName, struct stat* statbuf))
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{
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int status;
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struct stat statbuf;
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struct dirent *next;
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if (followLinks == TRUE)
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status = stat(fileName, &statbuf);
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else
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status = lstat(fileName, &statbuf);
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if (status < 0) {
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perror(fileName);
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return (FALSE);
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}
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if ( (followLinks == FALSE) && (S_ISLNK(statbuf.st_mode)) )
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return (TRUE);
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if (recurse == FALSE) {
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if (S_ISDIR(statbuf.st_mode)) {
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if (dirAction != NULL)
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return (dirAction(fileName, &statbuf));
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else
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return (TRUE);
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}
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}
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if (S_ISDIR(statbuf.st_mode)) {
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DIR *dir;
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dir = opendir(fileName);
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if (!dir) {
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perror(fileName);
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return (FALSE);
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}
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if (dirAction != NULL && depthFirst == FALSE) {
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status = dirAction(fileName, &statbuf);
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if (status == FALSE) {
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perror(fileName);
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return (FALSE);
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}
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}
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while ((next = readdir(dir)) != NULL) {
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char nextFile[NAME_MAX];
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if ((strcmp(next->d_name, "..") == 0)
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|| (strcmp(next->d_name, ".") == 0)) {
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continue;
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}
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sprintf(nextFile, "%s/%s", fileName, next->d_name);
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status =
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recursiveAction(nextFile, TRUE, followLinks, depthFirst,
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fileAction, dirAction);
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if (status < 0) {
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closedir(dir);
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return (FALSE);
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}
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}
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status = closedir(dir);
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if (status < 0) {
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perror(fileName);
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return (FALSE);
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}
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if (dirAction != NULL && depthFirst == TRUE) {
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status = dirAction(fileName, &statbuf);
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if (status == FALSE) {
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perror(fileName);
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return (FALSE);
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}
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}
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} else {
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if (fileAction == NULL)
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return (TRUE);
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else
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return (fileAction(fileName, &statbuf));
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}
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return (TRUE);
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}
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#endif
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#if defined (BB_TAR) || defined (BB_MKDIR)
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/*
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* Attempt to create the directories along the specified path, except for
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* the final component. The mode is given for the final directory only,
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* while all previous ones get default protections. Errors are not reported
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* here, as failures to restore files can be reported later.
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*/
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extern void createPath (const char *name, int mode)
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{
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char *cp;
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char *cpOld;
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char buf[NAME_MAX];
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strcpy (buf, name);
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cp = strchr (buf, '/');
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while (cp) {
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cpOld = cp;
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cp = strchr (cp + 1, '/');
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*cpOld = '\0';
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if (mkdir (buf, cp ? 0777 : mode) == 0)
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printf ("Directory \"%s\" created\n", buf);
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*cpOld = '/';
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}
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}
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#endif
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#if defined (BB_CHMOD_CHOWN_CHGRP) || defined (BB_MKDIR)
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/* [ugoa]{+|-|=}[rwxst] */
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extern int
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parse_mode( const char* s, mode_t* theMode)
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{
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mode_t andMode = S_ISVTX|S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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mode_t orMode = 0;
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mode_t mode = 0;
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mode_t groups = 0;
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char type;
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char c;
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do {
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for ( ; ; ) {
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switch ( c = *s++ ) {
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case '\0':
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return -1;
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case 'u':
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groups |= S_ISUID|S_IRWXU;
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continue;
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case 'g':
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groups |= S_ISGID|S_IRWXG;
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continue;
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case 'o':
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groups |= S_IRWXO;
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continue;
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case 'a':
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groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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continue;
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case '+':
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case '=':
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case '-':
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type = c;
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if ( groups == 0 ) /* The default is "all" */
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groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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break;
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default:
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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_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
|
|
|
|
|
|
#if !defined BB_REGEXP && (defined BB_GREP || defined BB_FIND || 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*)malloc((unsigned)(strlen(haystack)));
|
|
while(where!=NULL) {
|
|
foundOne++;
|
|
strcpy(oldhayStack, haystack);
|
|
#if 0
|
|
if ( strlen(newNeedle) > strlen(needle)) {
|
|
haystack = (char *)realloc(haystack, (unsigned)(strlen(haystack) -
|
|
strlen(needle) + strlen(newNeedle)));
|
|
}
|
|
#endif
|
|
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
|
|
/* END CODE */
|
|
|