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/*
* archives.c
* Detection of (Unix) archive formats
*
* Copyright (c) 2003 Christoph Pfisterer
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "global.h"
/*
* detection of various archive headers
*
* Most of this is based on the tapetype program by Doug Merritt,
* posted to the net in 1992. Some parts are augmented with stuff from
* /etc/magic.
*/
void detect_archive(SECTION *section, int level)
{
int fill, i, stored_sum, sum, en;
u4 magic;
unsigned char *buf;
fill = get_buffer(section, 0, 512, (void **)&buf);
if (fill < 512)
return;
/* tar archives */
sum = 0;
for (i = 0; i < 148; i++)
sum += (char)buf[i];
for (; i < 156; i++)
sum += ' ';
for (; i < 512; i++)
sum += (char)buf[i];
stored_sum = 0;
for (i = 148; i < 156; i++) {
if (buf[i] == 0)
break;
else if (buf[i] >= '0' && buf[i] <= '7')
stored_sum = (stored_sum * 8) + (buf[i] - '0');
else if (buf[i] != ' ') {
stored_sum = -1; /* make it mismatch, since this is an error */
break;
}
}
if (sum == stored_sum) {
if (memcmp((char *)buf + 257, "ustar \0", 8) == 0) {
print_line(level, "GNU tar archive");
} else if (memcmp((char *)buf + 257, "ustar\0", 6) == 0) {
print_line(level, "POSIX tar archive");
} else {
print_line(level, "Pre-POSIX tar archive");
}
}
/* cpio */
if (get_le_short(buf) == 070707) {
print_line(level, "cpio archive, little-endian binary");
} else if (get_be_short(buf) == 070707) {
print_line(level, "cpio archive, big-endian binary");
} else if (memcmp(buf, "07070", 5) == 0) {
print_line(level, "cpio archive, ascii");
}
/* bar */
if (memcmp(buf + 65, "\x56\0", 2) == 0) {
print_line(level, "bar archive");
}
/* dump */
for (en = 0; en < 2; en++) {
magic = get_ve_long(en, buf + 24);
if (magic == 60011) {
print_line(level, "dump: 4.1BSD (or older) or Sun OFS, %s", get_ve_name(en));
} else if (magic == 60012) {
print_line(level, "dump: 4.2BSD (or newer) without IDC or Sun NFS, %s", get_ve_name(en));
} else if (magic == 60013) {
print_line(level, "dump: 4.2BSD (or newer) with IDC, %s", get_ve_name(en));
} else if (magic == 60014) {
print_line(level, "dump: Convex Storage Manager, %s", get_ve_name(en));
}
}
}
/* EOF */
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