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/*
* Copyright (c) 2024
* Tim Woodall. All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* file-to-tape. This reads a file created by dump and writes it to a faketape
* recreating the blocking as if it had been written by dump
*/
#include <config.h>
#include "faketape-lib.h"
#include <err.h> // errx
#include <fcntl.h> // O_WRONLY
#include <cstring>
// Messy. Ideally we'd use readblock_tape from restore/readtape.c but there are
// too many issues with global variables that we don't use but need to link in.
FakeTape tape;
std::vector<uint8_t> databuffer;
void usage(const char* prog) {
std::cerr << "Usage " << prog << " [ -b max block size ] [-r] faketape-img dump-img" << std::endl;
std::cerr << " -r write as max block size blocks ignoring original block sizes." << std::endl;
exit(1);
}
int main(int argc, char* argv[]) {
const char* prog = argv[0];
int ch;
ssize_t block_size = 0;
bool reblock = false;
while (( ch = getopt(argc, argv, "b:r")) != -1)
switch(ch) {
case 'b': {
block_size = atoi(optarg);
if (block_size < 1024 || block_size > 16*1024*1024)
errx(1, "Invalid blocksize, must be between 1024 and %d", 16*1024*1024);
tape.setMaxBlockSize(block_size);
break;
}
case 'r':
reblock = true;
break;
default:
usage(prog);
}
argc -= optind;
argv += optind;
if (argc < 2)
usage(prog);
/* First check that the target tape image does not exist */
if (open(argv[0], O_RDONLY) != -1)
errx(1, "%s exists, won't overwrite.", argv[0]);
if (tape.open(argv[0], O_WRONLY|O_CREAT) != FakeTape::Response::OK) {
errx(1, "Cannot open tape (%d %s)", errno, strerror(errno));
}
argv++;
argc--;
while(argc--) {
/* Now open the dump image */
int dumpfd;
warnx("Starting %s", argv[0]);
dumpfd = open(argv[0], O_RDONLY);
if (dumpfd == -1) {
err(1, "%s does not exist.", argv[0]);
}
std::vector<uint8_t> buffer(1024);
/* Read the first block */
if(int rsize = read(dumpfd, (void*)buffer.data(), 1024); rsize != 1024)
err(1, "Failed to read first block from dump image (%d)", rsize);
uint32_t ntrec;
bool compressed;
// Manually copied from protocols/dumprestore.h
int32_t* c_magic = (int32_t*)(buffer.data()+24);
int32_t* c_flags = (int32_t*)(buffer.data()+888);
uint32_t* c_ntrec = (uint32_t*)(buffer.data()+896);
#define NFS_MAGIC (int)60012
#define DR_COMPRESSED 0x0080 /* dump tape is compressed */
// No bswap etc. Assume it's compatible
if (*c_magic == NFS_MAGIC) {
compressed = *c_flags & DR_COMPRESSED;
ntrec = *c_ntrec;
} else
errx(1, "This doesn't appear to be a dump tape, or was written on a system with byteswapped values");
if(block_size == 0) {
if (ntrec)
block_size = ntrec * (size_t)1024;
else
errx(1, "Old dump tapes do not have blocksize in header. You must specify -b <blocksize> on command line");
}
if(ntrec && block_size != (ssize_t)ntrec*(ssize_t)1024)
warnx("Tape appears to have been written with a blocksize of %zu but commandline specified %zu", ntrec*(size_t)1024, block_size);
buffer.resize(block_size + 1024);
/* Read in the rest of the first block */
if (int rsize = read(dumpfd, buffer.data() + 1024, block_size - 1024); rsize != block_size-1024)
err(1, "Failed to read the rest of the first block from dump image (%d)", rsize);
/* Write first block to tape */
if(tape.writeData(buffer.data(), block_size) != FakeTape::Response::OK)
err(1, "Write of first block failed");
while(true) {
int rsize;
if (!reblock && compressed) {
rsize = read(dumpfd, (void*)buffer.data(), sizeof(uint32_t));
if (rsize == 0)
break;
if (rsize != sizeof(uint32_t))
err(1, "Failed to read compress header from dump image (%d)", rsize);
int bsize = *(uint32_t*)buffer.data() >> 4;
rsize = read(dumpfd, (void*)(buffer.data()+sizeof(uint32_t)), bsize);
if (rsize != bsize)
err(1, "Failed to read compressed block from dump image (%d)", rsize);
rsize += 4;
} else {
rsize = read(dumpfd, (void*)buffer.data(), block_size);
if (rsize == 0)
break;
if (rsize == -1)
err(1, "Failed to read block from dump image");
if (rsize < block_size)
warnx("Short block read. This could be due to an incorrect -b setting");
}
if (rsize == block_size+4) {
warnx("Splitting oversized block");
tape.writeData(buffer.data(), rsize-4);
tape.writeData(buffer.data()+rsize-4, 4);
} else {
tape.writeData(buffer.data(), rsize);
}
}
close(dumpfd);
warnx("Dump %s read successfully", argv[0]);
argv++;
}
tape.close();
warnx("Finished");
}
/* vim: set sw=8 sts=8 ts=8 noexpandtab: */
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