mirror of
https://github.com/sheumann/hush.git
synced 2024-08-16 09:29:16 +00:00
#49: I found one memory overflow and memory leak in "ln" applet. Last patch reduced also 54 bytes. ;) #50: I found bug in loginutils/Makefile.in. New patch have also new function to libbb and aplied this to applets and other cosmetic changes.
107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*
|
|
* 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 Library 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.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "unarchive.h"
|
|
#include "libbb.h"
|
|
|
|
file_header_t *get_header_ar(FILE *src_stream)
|
|
{
|
|
file_header_t *typed;
|
|
union {
|
|
char raw[60];
|
|
struct {
|
|
char name[16];
|
|
char date[12];
|
|
char uid[6];
|
|
char gid[6];
|
|
char mode[8];
|
|
char size[10];
|
|
char magic[2];
|
|
} formated;
|
|
} ar;
|
|
static char *ar_long_names;
|
|
|
|
if (fread(ar.raw, 1, 60, src_stream) != 60) {
|
|
return(NULL);
|
|
}
|
|
archive_offset += 60;
|
|
/* align the headers based on the header magic */
|
|
if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
|
|
/* some version of ar, have an extra '\n' after each data entry,
|
|
* this puts the next header out by 1 */
|
|
if (ar.formated.magic[1] != '`') {
|
|
error_msg("Invalid magic");
|
|
return(NULL);
|
|
}
|
|
/* read the next char out of what would be the data section,
|
|
* if its a '\n' then it is a valid header offset by 1*/
|
|
archive_offset++;
|
|
if (fgetc(src_stream) != '\n') {
|
|
error_msg("Invalid magic");
|
|
return(NULL);
|
|
}
|
|
/* fix up the header, we started reading 1 byte too early */
|
|
/* raw_header[60] wont be '\n' as it should, but it doesnt matter */
|
|
memmove(ar.raw, &ar.raw[1], 59);
|
|
}
|
|
|
|
typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
|
|
|
|
typed->size = (size_t) atoi(ar.formated.size);
|
|
/* long filenames have '/' as the first character */
|
|
if (ar.formated.name[0] == '/') {
|
|
if (ar.formated.name[1] == '/') {
|
|
/* If the second char is a '/' then this entries data section
|
|
* stores long filename for multiple entries, they are stored
|
|
* in static variable long_names for use in future entries */
|
|
ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
|
|
fread(ar_long_names, 1, typed->size, src_stream);
|
|
archive_offset += typed->size;
|
|
/* This ar entries data section only contained filenames for other records
|
|
* they are stored in the static ar_long_names for future reference */
|
|
return (get_header_ar(src_stream)); /* Return next header */
|
|
} else if (ar.formated.name[1] == ' ') {
|
|
/* This is the index of symbols in the file for compilers */
|
|
seek_sub_file(src_stream, typed->size);
|
|
return (get_header_ar(src_stream)); /* Return next header */
|
|
} else {
|
|
/* The number after the '/' indicates the offset in the ar data section
|
|
(saved in variable long_name) that conatains the real filename */
|
|
if (!ar_long_names) {
|
|
error_msg("Cannot resolve long file name");
|
|
return (NULL);
|
|
}
|
|
typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
|
|
}
|
|
} else {
|
|
/* short filenames */
|
|
typed->name = xstrndup(ar.formated.name, 16);
|
|
}
|
|
typed->name[strcspn(typed->name, " /")]='\0';
|
|
|
|
/* convert the rest of the now valid char header to its typed struct */
|
|
parse_mode(ar.formated.mode, &typed->mode);
|
|
typed->mtime = atoi(ar.formated.date);
|
|
typed->uid = atoi(ar.formated.uid);
|
|
typed->gid = atoi(ar.formated.gid);
|
|
|
|
return(typed);
|
|
}
|
|
|