651 lines
16 KiB
C
651 lines
16 KiB
C
/* vi: set sw=4 ts=4: */
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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 version 2 as
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* published by the Free Software Foundation.
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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
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* GNU Library 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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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <time.h>
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#include <pwd.h>
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#include <grp.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <errno.h>
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#include <libgen.h>
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#include <stdarg.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#ifndef __APPLE__
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#include <sys/sysmacros.h> /* major() and minor() */
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#endif
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#include <ftw.h>
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#ifdef EXTENDED_ATTRIBUTES
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#include <sys/capability.h>
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#endif /* EXTENDED_ATTRIBUTES */
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const char *bb_applet_name;
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uid_t recursive_uid;
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gid_t recursive_gid;
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unsigned int recursive_mode;
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#define PASSWD_PATH "etc/passwd" /* MUST be relative */
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#define GROUP_PATH "etc/group" /* MUST be relative */
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void bb_verror_msg(const char *s, va_list p)
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{
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fflush(stdout);
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fprintf(stderr, "%s: ", bb_applet_name);
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vfprintf(stderr, s, p);
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}
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void bb_error_msg(const char *s, ...)
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{
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va_list p;
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va_start(p, s);
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bb_verror_msg(s, p);
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va_end(p);
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putc('\n', stderr);
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}
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void bb_error_msg_and_die(const char *s, ...)
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{
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va_list p;
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va_start(p, s);
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bb_verror_msg(s, p);
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va_end(p);
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putc('\n', stderr);
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exit(1);
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}
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void bb_vperror_msg(const char *s, va_list p)
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{
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int err=errno;
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if(s == 0) s = "";
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bb_verror_msg(s, p);
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if (*s) s = ": ";
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fprintf(stderr, "%s%s\n", s, strerror(err));
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}
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void bb_perror_msg(const char *s, ...)
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{
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va_list p;
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va_start(p, s);
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bb_vperror_msg(s, p);
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va_end(p);
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}
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void bb_perror_msg_and_die(const char *s, ...)
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{
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va_list p;
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va_start(p, s);
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bb_vperror_msg(s, p);
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va_end(p);
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exit(1);
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}
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FILE *bb_xfopen(const char *path, const char *mode)
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{
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FILE *fp;
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if ((fp = fopen(path, mode)) == NULL)
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bb_perror_msg_and_die("%s", path);
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return fp;
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}
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enum {
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FILEUTILS_PRESERVE_STATUS = 1,
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FILEUTILS_DEREFERENCE = 2,
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FILEUTILS_RECUR = 4,
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FILEUTILS_FORCE = 8,
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FILEUTILS_INTERACTIVE = 16
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};
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int bb_make_directory (char *path, long mode, int flags)
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{
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mode_t mask;
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const char *fail_msg;
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char *s = path;
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char c;
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struct stat st;
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mask = umask(0);
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if (mode == -1) {
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umask(mask);
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mode = (S_IXUSR | S_IXGRP | S_IXOTH |
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S_IWUSR | S_IWGRP | S_IWOTH |
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S_IRUSR | S_IRGRP | S_IROTH) & ~mask;
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} else {
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umask(mask & ~0300);
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}
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do {
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c = 0;
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if (flags & FILEUTILS_RECUR) { /* Get the parent. */
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/* Bypass leading non-'/'s and then subsequent '/'s. */
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while (*s) {
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if (*s == '/') {
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do {
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++s;
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} while (*s == '/');
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c = *s; /* Save the current char */
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*s = 0; /* and replace it with nul. */
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break;
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}
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++s;
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}
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}
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if (mkdir(path, 0777) < 0) {
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/* If we failed for any other reason than the directory
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* already exists, output a diagnostic and return -1.*/
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if ((errno != EEXIST && errno != EISDIR)
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|| !(flags & FILEUTILS_RECUR)
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|| (stat(path, &st) < 0 || !S_ISDIR(st.st_mode))) {
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fail_msg = "create";
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umask(mask);
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break;
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}
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/* Since the directory exists, don't attempt to change
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* permissions if it was the full target. Note that
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* this is not an error conditon. */
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if (!c) {
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umask(mask);
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return 0;
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}
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}
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if (!c) {
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/* Done. If necessary, updated perms on the newly
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* created directory. Failure to update here _is_
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* an error.*/
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umask(mask);
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if ((mode != -1) && (chmod(path, mode) < 0)){
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fail_msg = "set permissions of";
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break;
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}
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return 0;
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}
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/* Remove any inserted nul from the path (recursive mode). */
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*s = c;
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} while (1);
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bb_perror_msg ("Cannot %s directory `%s'", fail_msg, path);
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return -1;
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}
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const char * const bb_msg_memory_exhausted = "memory exhausted";
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void *xmalloc(size_t size)
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{
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void *ptr = malloc(size);
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if (ptr == NULL && size != 0)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return ptr;
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}
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void *xcalloc(size_t nmemb, size_t size)
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{
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void *ptr = calloc(nmemb, size);
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if (ptr == NULL && nmemb != 0 && size != 0)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return ptr;
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}
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void *xrealloc(void *ptr, size_t size)
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{
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ptr = realloc(ptr, size);
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if (ptr == NULL && size != 0)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return ptr;
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}
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char *private_get_line_from_file(FILE *file, int c)
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{
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#define GROWBY (80) /* how large we will grow strings by */
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int ch;
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int idx = 0;
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char *linebuf = NULL;
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int linebufsz = 0;
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while ((ch = getc(file)) != EOF) {
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/* grow the line buffer as necessary */
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if (idx > linebufsz - 2) {
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linebuf = xrealloc(linebuf, linebufsz += GROWBY);
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}
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linebuf[idx++] = (char)ch;
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if (!ch) return linebuf;
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if (c<2 && ch == '\n') {
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if (c) {
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--idx;
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}
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break;
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}
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}
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if (linebuf) {
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if (ferror(file)) {
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free(linebuf);
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return NULL;
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}
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linebuf[idx] = 0;
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}
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return linebuf;
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}
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char *bb_get_chomped_line_from_file(FILE *file)
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{
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return private_get_line_from_file(file, 1);
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}
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long my_getpwnam(const char *name)
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{
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struct passwd *myuser;
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FILE *stream;
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stream = bb_xfopen(PASSWD_PATH, "r");
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while(1) {
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errno = 0;
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myuser = fgetpwent(stream);
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if (myuser == NULL)
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bb_error_msg_and_die("unknown user name: %s", name);
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if (errno)
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bb_perror_msg_and_die("fgetpwent");
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if (!strcmp(name, myuser->pw_name))
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break;
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}
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fclose(stream);
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return myuser->pw_uid;
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}
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long my_getgrnam(const char *name)
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{
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struct group *mygroup;
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FILE *stream;
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stream = bb_xfopen(GROUP_PATH, "r");
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while(1) {
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errno = 0;
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mygroup = fgetgrent(stream);
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if (mygroup == NULL)
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bb_error_msg_and_die("unknown group name: %s", name);
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if (errno)
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bb_perror_msg_and_die("fgetgrent");
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if (!strcmp(name, mygroup->gr_name))
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break;
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}
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fclose(stream);
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return mygroup->gr_gid;
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}
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unsigned long get_ug_id(const char *s, long (*my_getxxnam)(const char *))
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{
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unsigned long r;
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char *p;
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r = strtoul(s, &p, 10);
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if (*p || (s == p)) {
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r = my_getxxnam(s);
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}
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return r;
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}
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char * last_char_is(const char *s, int c)
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{
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char *sret = (char *)s;
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if (sret) {
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sret = strrchr(sret, c);
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if(sret != NULL && *(sret+1) != 0)
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sret = NULL;
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}
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return sret;
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}
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void bb_xasprintf(char **string_ptr, const char *format, ...)
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{
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va_list p;
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int r;
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va_start(p, format);
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r = vasprintf(string_ptr, format, p);
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va_end(p);
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if (r < 0) {
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bb_perror_msg_and_die("bb_xasprintf");
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}
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}
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char *concat_path_file(const char *path, const char *filename)
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{
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char *outbuf;
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char *lc;
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if (!path)
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path = "";
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lc = last_char_is(path, '/');
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while (*filename == '/')
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filename++;
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bb_xasprintf(&outbuf, "%s%s%s", path, (lc==NULL ? "/" : ""), filename);
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return outbuf;
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}
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#ifdef EXTENDED_ATTRIBUTES
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int bb_set_xattr(const char *fpath, const char *xattr)
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{
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cap_t cap, cap_file, cap_new;
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char *cap_file_text, *cap_new_text;
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ssize_t length;
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cap = cap_from_text(xattr);
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if (cap == NULL)
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bb_perror_msg_and_die("cap_from_text failed for %s", xattr);
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cap_file = cap_get_file(fpath);
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if (cap_file == NULL) {
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/* if no capability was set before, we initialize cap_file */
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if (errno != ENODATA)
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bb_perror_msg_and_die("cap_get_file failed on %s", fpath);
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cap_file = cap_init();
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if (!cap_file)
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bb_perror_msg_and_die("cap_init failed");
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}
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if ((cap_file_text = cap_to_text(cap_file, &length)) == NULL)
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bb_perror_msg_and_die("cap_to_name failed on %s", fpath);
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bb_xasprintf(&cap_new_text, "%s %s", cap_file_text, xattr);
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if ((cap_new = cap_from_text(cap_new_text)) == NULL)
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bb_perror_msg_and_die("cap_from_text failed on %s", cap_new_text);
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if (cap_set_file(fpath, cap_new) == -1)
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bb_perror_msg_and_die("cap_set_file failed for %s (xattr = %s)", fpath, xattr);
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cap_free(cap);
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cap_free(cap_file);
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cap_free(cap_file_text);
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cap_free(cap_new);
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cap_free(cap_new_text);
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return 0;
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}
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#endif /* EXTENDED_ATTRIBUTES */
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void bb_show_usage(void)
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{
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fprintf(stderr, "%s: [-d device_table] rootdir\n\n", bb_applet_name);
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fprintf(stderr, "Creates a batch of special files as specified in a device table.\n");
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fprintf(stderr, "Device table entries take the form of:\n");
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fprintf(stderr, "name type mode user group major minor start increment count\n\n");
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fprintf(stderr, "Where name is the file name, type can be one of:\n");
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fprintf(stderr, " f A regular file\n");
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fprintf(stderr, " d Directory\n");
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fprintf(stderr, " r Directory recursively\n");
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fprintf(stderr, " c Character special device file\n");
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fprintf(stderr, " b Block special device file\n");
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fprintf(stderr, " p Fifo (named pipe)\n");
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fprintf(stderr, "uid is the user id for the target file, gid is the group id for the\n");
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fprintf(stderr, "target file. The rest of the entries (major, minor, etc) apply to\n");
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fprintf(stderr, "to device special files. A '-' may be used for blank entries.\n\n");
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fprintf(stderr, "For example:\n");
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fprintf(stderr, "<name> <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count>\n");
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fprintf(stderr, "/dev d 755 0 0 - - - - -\n");
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fprintf(stderr, "/dev/console c 666 0 0 5 1 - - -\n");
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fprintf(stderr, "/dev/null c 666 0 0 1 3 0 0 -\n");
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fprintf(stderr, "/dev/zero c 666 0 0 1 5 0 0 -\n");
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fprintf(stderr, "/dev/hda b 640 0 0 3 0 0 0 -\n");
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fprintf(stderr, "/dev/hda b 640 0 0 3 1 1 1 15\n");
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fprintf(stderr, "/dev/rtp b 640 0 0 250 0 0 1 5\n");
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fprintf(stderr, "/dev/gps b 640 0 0 251 0 1 1 5\n");
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fprintf(stderr, "/dev/uio b 640 0 0 252 0 1 2 5\n");
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fprintf(stderr, "/dev/uio b 640 0 0 252 1 6 2 5\n\n");
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fprintf(stderr, "Will Produce:\n");
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fprintf(stderr, "/dev\n");
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fprintf(stderr, "/dev/console\n");
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fprintf(stderr, "/dev/null\n");
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fprintf(stderr, "/dev/zero\n");
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fprintf(stderr, "/dev/hda\n");
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fprintf(stderr, "/dev/hda[1-15] with minor numbers [1-15]\n");
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fprintf(stderr, "/dev/rtp[0-4] with minor numbers [0-4]\n");
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fprintf(stderr, "/dev/gps[1-5] with minor numbers [0-4]\n");
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fprintf(stderr, "/dev/uio[1-5] with minor numbers 0,2,4,6,8\n");
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fprintf(stderr, "/dev/uio[6-10] with minor numbers 1,3,5,7,9\n");
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exit(1);
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}
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int bb_recursive(const char *fpath, const struct stat *sb,
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int tflag, struct FTW *ftwbuf){
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if (lchown(fpath, recursive_uid, recursive_gid) == -1) {
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bb_perror_msg("chown failed for %s", fpath);
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return -1;
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}
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/* chmod() is optional, also skip if dangling symlink */
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if (recursive_mode == -1 || (tflag == FTW_SL && !access(fpath, F_OK)))
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return 0;
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if (chmod(fpath, recursive_mode) < 0) {
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bb_perror_msg("chmod failed for %s", fpath);
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return -1;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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int opt;
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FILE *table = stdin;
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char *rootdir = NULL;
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char *full_name = NULL;
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char *line = NULL;
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int linenum = 0;
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int ret = EXIT_SUCCESS;
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bb_applet_name = basename(argv[0]);
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while ((opt = getopt(argc, argv, "d:")) != -1) {
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switch(opt) {
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case 'd':
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table = bb_xfopen((line=optarg), "r");
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break;
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default:
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bb_show_usage();
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}
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}
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if (optind >= argc || (rootdir=argv[optind])==NULL) {
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bb_error_msg_and_die("root directory not speficied");
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}
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if (chdir(rootdir) != 0) {
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bb_perror_msg_and_die("Couldnt chdir to %s", rootdir);
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}
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umask(0);
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printf("rootdir=%s\n", rootdir);
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if (line) {
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printf("table='%s'\n", line);
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} else {
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printf("table=<stdin>\n");
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}
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while ((line = bb_get_chomped_line_from_file(table))) {
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char type;
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unsigned int mode = 0755;
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unsigned int major = 0;
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unsigned int minor = 0;
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unsigned int count = 0;
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unsigned int increment = 0;
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unsigned int start = 0;
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char xattr[255];
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char name[4096];
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char user[41];
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char group[41];
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uid_t uid;
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gid_t gid;
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linenum++;
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if (1 == sscanf(line, " |xattr %254s", xattr)) {
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#ifdef EXTENDED_ATTRIBUTES
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if (!full_name)
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bb_error_msg_and_die("line %d should be after a file\n", linenum);
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|
|
if (bb_set_xattr(full_name, xattr) < 0)
|
|
bb_error_msg_and_die("can't set cap %s on file %s\n", xattr, full_name);
|
|
#else
|
|
bb_error_msg_and_die("line %d not supported: '%s'\nDid you forget to enable "
|
|
"BR2_ROOTFS_DEVICE_TABLE_SUPPORTS_EXTENDED_ATTRIBUTES?\n",
|
|
linenum, line);
|
|
#endif /* EXTENDED_ATTRIBUTES */
|
|
continue;
|
|
}
|
|
|
|
if ((2 > sscanf(line, "%4095s %c %o %40s %40s %u %u %u %u %u", name,
|
|
&type, &mode, user, group, &major,
|
|
&minor, &start, &increment, &count)) ||
|
|
((major | minor | start | count | increment) > 0xfffff))
|
|
{
|
|
if (*line=='\0' || *line=='#' || isspace(*line))
|
|
continue;
|
|
bb_error_msg("line %d invalid: '%s'\n", linenum, line);
|
|
ret = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
if (name[0] == '#') {
|
|
continue;
|
|
}
|
|
if (*group) {
|
|
gid = get_ug_id(group, my_getgrnam);
|
|
} else {
|
|
gid = getgid();
|
|
}
|
|
if (*user) {
|
|
uid = get_ug_id(user, my_getpwnam);
|
|
} else {
|
|
uid = getuid();
|
|
}
|
|
|
|
/*
|
|
* free previous full name
|
|
* we don't de-allocate full_name at the end of the parsing,
|
|
* because we may need it if the next line is an xattr.
|
|
*/
|
|
free(full_name);
|
|
full_name = concat_path_file(rootdir, name);
|
|
|
|
if (type == 'd') {
|
|
bb_make_directory(full_name, mode | S_IFDIR, FILEUTILS_RECUR);
|
|
if (chown(full_name, uid, gid) == -1) {
|
|
bb_perror_msg("line %d: chown failed for %s", linenum, full_name);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
if ((mode != -1) && (chmod(full_name, mode) < 0)){
|
|
bb_perror_msg("line %d: chmod failed for %s", linenum, full_name);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
} else if (type == 'f' || type == 'F') {
|
|
struct stat st;
|
|
if ((stat(full_name, &st) < 0 || !S_ISREG(st.st_mode))) {
|
|
if (type == 'F') {
|
|
continue; /*Ignore optional files*/
|
|
}
|
|
bb_perror_msg("line %d: regular file '%s' does not exist", linenum, full_name);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
if (chown(full_name, uid, gid) == -1) {
|
|
bb_perror_msg("line %d: chown failed for %s", linenum, full_name);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
if ((mode != -1) && (chmod(full_name, mode) < 0)){
|
|
bb_perror_msg("line %d: chmod failed for %s", linenum, full_name);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
} else if (type == 'r') {
|
|
recursive_uid = uid;
|
|
recursive_gid = gid;
|
|
recursive_mode = mode;
|
|
if (nftw(full_name, bb_recursive, 20, FTW_MOUNT | FTW_PHYS) < 0) {
|
|
bb_perror_msg("line %d: recursive failed for %s", linenum, full_name);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
} else
|
|
{
|
|
dev_t rdev;
|
|
unsigned i;
|
|
char *full_name_inc;
|
|
|
|
if (type == 'p') {
|
|
mode |= S_IFIFO;
|
|
}
|
|
else if (type == 'c') {
|
|
mode |= S_IFCHR;
|
|
}
|
|
else if (type == 'b') {
|
|
mode |= S_IFBLK;
|
|
} else {
|
|
bb_error_msg("line %d: Unsupported file type %c", linenum, type);
|
|
ret = EXIT_FAILURE;
|
|
goto loop;
|
|
}
|
|
|
|
full_name_inc = xmalloc(strlen(full_name) + sizeof(int)*3 + 2);
|
|
if (count)
|
|
count--;
|
|
for (i = start; i <= start + count; i++) {
|
|
sprintf(full_name_inc, count ? "%s%u" : "%s", full_name, i);
|
|
rdev = makedev(major, minor + (i - start) * increment);
|
|
if (mknod(full_name_inc, mode, rdev) < 0) {
|
|
bb_perror_msg("line %d: can't create node %s", linenum, full_name_inc);
|
|
ret = EXIT_FAILURE;
|
|
} else if (lchown(full_name_inc, uid, gid) < 0) {
|
|
bb_perror_msg("line %d: can't chown %s", linenum, full_name_inc);
|
|
ret = EXIT_FAILURE;
|
|
} else if (chmod(full_name_inc, mode) < 0) {
|
|
bb_perror_msg("line %d: can't chmod %s", linenum, full_name_inc);
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
}
|
|
free(full_name_inc);
|
|
}
|
|
loop:
|
|
free(line);
|
|
}
|
|
fclose(table);
|
|
|
|
return ret;
|
|
}
|