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cachunk.c
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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include "cachunk.h"
#include "cautil.h"
#include "compressor.h"
#include "def.h"
#include "util.h"
int ca_load_fd(int fd, ReallocBuffer *buffer) {
uint64_t count = 0;
if (fd < 0)
return -EINVAL;
if (!buffer)
return -EINVAL;
for (;;) {
ssize_t l;
void *p;
/* Don't permit loading chunks larger than the chunk limit */
if (count >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
p = realloc_buffer_extend(buffer, BUFFER_SIZE);
if (!p)
return -ENOMEM;
l = read(fd, p, BUFFER_SIZE);
if (l < 0)
return -errno;
realloc_buffer_shorten(buffer, BUFFER_SIZE - l);
count += l;
if (l == 0)
break;
}
/* Don't permit empty chunks */
if (count < CA_CHUNK_SIZE_LIMIT_MIN)
return -EBADMSG;
return 0;
}
int ca_load_and_decompress_fd(int fd, ReallocBuffer *buffer) {
_cleanup_(compressor_finish) CompressorContext context = COMPRESSOR_CONTEXT_INIT;
int compression_type = _CA_COMPRESSION_TYPE_INVALID;
uint8_t fd_buffer[BUFFER_SIZE];
bool got_decoder_eof = false;
uint64_t ccount = 0, dcount = 0;
ssize_t l;
int r;
if (fd < 0)
return -EINVAL;
if (!buffer)
return -EINVAL;
/* First, read enough of the file, so that we can figure out which algorithm is used */
for (;;) {
assert(ccount < BUFFER_SIZE);
l = read(fd, fd_buffer + ccount, sizeof(fd_buffer) - ccount);
if (l < 0)
return -errno;
if (l == 0)
return -EPIPE;
ccount += l;
compression_type = detect_compression(fd_buffer, ccount);
if (compression_type >= 0)
break;
if (compression_type != -EAGAIN) /* EAGAIN means: need more data before I can decide */
return compression_type;
}
r = compressor_start_decode(&context, compression_type);
if (r < 0)
return r;
l = ccount;
for (;;) {
r = compressor_input(&context, fd_buffer, l);
if (r < 0)
return 0;
for (;;) {
size_t done;
void *p;
p = realloc_buffer_extend(buffer, BUFFER_SIZE);
if (!p)
return -ENOMEM;
r = compressor_decode(&context, p, BUFFER_SIZE, &done);
if (r < 0)
return r;
realloc_buffer_shorten(buffer, BUFFER_SIZE - done);
dcount += done;
if (dcount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
got_decoder_eof = r == COMPRESSOR_EOF;
if (r != COMPRESSOR_MORE)
break;
};
l = read(fd, fd_buffer, sizeof(fd_buffer));
if (l < 0)
return -errno;
if (l == 0) {
if (!got_decoder_eof) /* Premature end of file */
return -EPIPE;
break;
}
if (got_decoder_eof) /* Trailing noise */
return -EBADMSG;
ccount += l;
if (ccount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
}
if (ccount < CA_CHUNK_SIZE_LIMIT_MIN || dcount < CA_CHUNK_SIZE_LIMIT_MIN)
return -EBADMSG;
return 0;
}
int ca_load_and_compress_fd(int fd, CaCompressionType compression_type, ReallocBuffer *buffer) {
_cleanup_(compressor_finish) CompressorContext context = COMPRESSOR_CONTEXT_INIT;
uint64_t ccount = 0, dcount = 0;
int r;
if (fd < 0)
return -EINVAL;
if (!buffer)
return -EINVAL;
if (compression_type < 0)
return -EINVAL;
if (compression_type >= _CA_COMPRESSION_TYPE_MAX)
return -EOPNOTSUPP;
r = compressor_start_encode(&context, compression_type);
if (r < 0)
return r;
for (;;) {
uint8_t fd_buffer[BUFFER_SIZE];
ssize_t l;
bool eof, got_encoder_eof = false;
l = read(fd, fd_buffer, sizeof(fd_buffer));
if (l < 0)
return -errno;
eof = (size_t) l < sizeof(fd_buffer);
dcount += l;
if (dcount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
r = compressor_input(&context, fd_buffer, l);
if (r < 0)
return r;
for (;;) {
uint8_t *p;
size_t done;
p = realloc_buffer_extend(buffer, BUFFER_SIZE);
if (!p)
return -ENOMEM;
r = compressor_encode(&context, eof, p, BUFFER_SIZE, &done);
if (r < 0)
return r;
realloc_buffer_shorten(buffer, BUFFER_SIZE - done);
ccount += done;
if (ccount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EBADMSG;
got_encoder_eof = r == COMPRESSOR_EOF;
if (r != COMPRESSOR_MORE)
break;
}
if (got_encoder_eof)
break;
}
if (ccount < CA_CHUNK_SIZE_LIMIT_MIN || dcount < CA_CHUNK_SIZE_LIMIT_MIN)
return -EBADMSG;
return 0;
}
int ca_save_fd(int fd, const void *data, size_t size) {
if (fd < 0)
return -EINVAL;
if (size < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (size > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!data)
return -EINVAL;
return loop_write(fd, data, size);
}
int ca_save_and_compress_fd(int fd, CaCompressionType compression_type, const void *data, size_t size) {
_cleanup_(compressor_finish) CompressorContext context = COMPRESSOR_CONTEXT_INIT;
uint64_t ccount = 0;
int r;
if (fd < 0)
return -EINVAL;
if (size < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (size > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!data)
return -EINVAL;
if (compression_type < 0)
return -EINVAL;
if (compression_type >= _CA_COMPRESSION_TYPE_MAX)
return -EOPNOTSUPP;
r = compressor_start_encode(&context, compression_type);
if (r < 0)
return r;
r = compressor_input(&context, data, size);
if (r < 0)
return r;
for (;;) {
uint8_t buffer[BUFFER_SIZE];
size_t done;
int k;
r = compressor_encode(&context, true, buffer, sizeof(buffer), &done);
if (r < 0)
return r;
k = loop_write(fd, buffer, done);
if (k < 0)
return k;
ccount += done;
if (ccount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (r == COMPRESSOR_EOF)
break;
}
if (ccount < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
return 0;
}
int ca_save_and_decompress_fd(int fd, const void *data, size_t size) {
_cleanup_(compressor_finish) CompressorContext context = COMPRESSOR_CONTEXT_INIT;
int compression_type;
uint64_t dcount = 0;
int r;
if (fd < 0)
return -EINVAL;
if (size < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (size > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!data)
return -EINVAL;
compression_type = detect_compression(data, size);
if (compression_type == -EAGAIN) /* If we the data isn't long enough to contain a signature, refuse */
return -EBADMSG;
if (compression_type < 0)
return compression_type;
r = compressor_start_decode(&context, compression_type);
if (r < 0)
return r;
r = compressor_input(&context, data, size);
if (r < 0)
return r;
for (;;) {
uint8_t buffer[BUFFER_SIZE];
size_t done;
int k;
r = compressor_decode(&context, buffer, sizeof(buffer), &done);
if (r < 0)
return r;
k = loop_write(fd, buffer, done);
if (k < 0)
return k;
dcount += done;
if (dcount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (r == COMPRESSOR_EOF)
break;
}
if (dcount < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
return 0;
}
int ca_compress(CaCompressionType compression_type, const void *data, size_t size, ReallocBuffer *buffer) {
_cleanup_(compressor_finish) CompressorContext context = COMPRESSOR_CONTEXT_INIT;
uint64_t ccount = 0;
int r;
if (!buffer)
return -EINVAL;
if (size < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (size > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!data)
return -EINVAL;
r = compressor_start_encode(&context, compression_type);
if (r < 0)
return r;
r = compressor_input(&context, data, size);
if (r < 0)
return r;
for (;;) {
size_t done;
uint8_t *p;
p = realloc_buffer_extend(buffer, BUFFER_SIZE);
if (!p)
return -ENOMEM;
r = compressor_encode(&context, true, p, BUFFER_SIZE, &done);
if (r < 0)
return r;
realloc_buffer_shorten(buffer, BUFFER_SIZE - done);
ccount += done;
if (ccount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (r == COMPRESSOR_EOF)
break;
}
if (ccount < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
return 0;
}
int ca_decompress(const void *data, size_t size, ReallocBuffer *buffer) {
_cleanup_(compressor_finish) CompressorContext context = COMPRESSOR_CONTEXT_INIT;
uint64_t dcount = 0;
int compression_type;
int r;
if (!buffer)
return -EINVAL;
if (size < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
if (size > CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (!data)
return -EINVAL;
compression_type = detect_compression(data, size);
if (compression_type == -EAGAIN)
return -EBADMSG;
if (compression_type < 0)
return compression_type;
r = compressor_start_decode(&context, compression_type);
if (r < 0)
return r;
r = compressor_input(&context, data, size);
if (r < 0)
return r;
for (;;) {
uint8_t *p;
size_t done;
p = realloc_buffer_extend(buffer, BUFFER_SIZE);
if (!p)
return -ENOMEM;
r = compressor_decode(&context, p, BUFFER_SIZE, &done);
if (r < 0)
return r;
realloc_buffer_shorten(buffer, BUFFER_SIZE - done);
dcount += done;
if (dcount >= CA_CHUNK_SIZE_LIMIT_MAX)
return -EINVAL;
if (r == COMPRESSOR_EOF)
break;
}
if (dcount < CA_CHUNK_SIZE_LIMIT_MIN)
return -EINVAL;
return 0;
}
int ca_chunk_file_open(int chunk_fd, const char *prefix, const CaChunkID *chunkid, const char *suffix, int flags) {
char path[CA_CHUNK_ID_PATH_SIZE(prefix, suffix)];
bool made = false;
char *slash = NULL;
int r, fd;
/* Opens a file below the directory identified by 'chunk_fd', built as <prefix><4ch id prefix>/<id><suffix>. */
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
ca_chunk_id_format_path(prefix, chunkid, suffix, path);
if ((flags & O_CREAT) == O_CREAT) {
assert_se(slash = strrchr(path, '/'));
*slash = 0;
if (mkdirat(chunk_fd, path, 0777) < 0) {
if (errno != EEXIST)
return -errno;
} else
made = true;
*slash = '/';
}
fd = openat(chunk_fd, path, flags, 0444); /* we mark the chunk files read-only, as they should be considered immutable after creation */
if (fd < 0) {
r = -errno;
if (made) {
assert(slash);
*slash = 0;
(void) unlinkat(chunk_fd, path, AT_REMOVEDIR);
}
return r;
}
return fd;
}
static int ca_chunk_file_access(int chunk_fd, const char *prefix, const CaChunkID *chunkid, const char *suffix) {
char path[CA_CHUNK_ID_PATH_SIZE(prefix, suffix)];
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
ca_chunk_id_format_path(prefix, chunkid, suffix, path);
if (faccessat(chunk_fd, path, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
return errno == ENOENT ? 0 : -errno;
return 1;
}
static int ca_chunk_file_unlink(int chunk_fd, const char *prefix, const CaChunkID *chunkid, const char *suffix) {
char path[CA_CHUNK_ID_PATH_SIZE(prefix, suffix)], *slash;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
ca_chunk_id_format_path(prefix, chunkid, suffix, path);
if (unlinkat(chunk_fd, path, 0) < 0)
return -errno;
slash = strrchr(path, '/');
assert(slash);
*slash = 0;
(void) unlinkat(chunk_fd, path, AT_REMOVEDIR);
return 0;
}
static int ca_chunk_file_rename(int chunk_fd, const char *prefix, const CaChunkID *chunkid, const char *old_suffix, const char *new_suffix) {
char old_path[CA_CHUNK_ID_PATH_SIZE(prefix, old_suffix)], new_path[CA_CHUNK_ID_PATH_SIZE(prefix, new_suffix)];
int r;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
ca_chunk_id_format_path(prefix, chunkid, old_suffix, old_path);
ca_chunk_id_format_path(prefix, chunkid, new_suffix, new_path);
r = rename_noreplace(chunk_fd, old_path, chunk_fd, new_path);
if (r < 0)
return r;
return 0;
}
int ca_chunk_file_load(
int chunk_fd,
const char *prefix,
const CaChunkID *chunkid,
CaChunkCompression desired_compression,
CaCompressionType compression_type,
ReallocBuffer *buffer,
CaChunkCompression *ret_effective_compression) {
_cleanup_(safe_closep) int fd = -1;
CaChunkCompression fd_compression;
int r;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
if (desired_compression < 0)
return -EINVAL;
if (desired_compression >= _CA_CHUNK_COMPRESSION_MAX)
return -EINVAL;
if (!buffer)
return -EINVAL;
if (desired_compression == CA_CHUNK_UNCOMPRESSED) {
fd = ca_chunk_file_open(chunk_fd, prefix, chunkid, NULL, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
fd_compression = CA_CHUNK_UNCOMPRESSED;
} else {
fd = ca_chunk_file_open(chunk_fd, prefix, chunkid, ca_compressed_chunk_suffix(), O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
fd_compression = CA_CHUNK_COMPRESSED;
}
if (fd == -ELOOP) /* If it's a symlink, then it's marked as "missing" */
return -EADDRNOTAVAIL;
if (fd < 0) {
if (fd != -ENOENT)
return fd;
if (desired_compression == CA_CHUNK_UNCOMPRESSED) {
fd = ca_chunk_file_open(chunk_fd, prefix, chunkid, ca_compressed_chunk_suffix(), O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
fd_compression = CA_CHUNK_COMPRESSED;
} else {
fd = ca_chunk_file_open(chunk_fd, prefix, chunkid, NULL, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
fd_compression = CA_CHUNK_UNCOMPRESSED;
}
if (fd == -ELOOP) /* If it's a symlink, then it's marked as "missing" */
return -EADDRNOTAVAIL;
if (fd < 0)
return fd;
}
if (desired_compression == CA_CHUNK_UNCOMPRESSED && fd_compression == CA_CHUNK_COMPRESSED)
r = ca_load_and_decompress_fd(fd, buffer);
else if (desired_compression == CA_CHUNK_COMPRESSED && fd_compression == CA_CHUNK_UNCOMPRESSED)
r = ca_load_and_compress_fd(fd, compression_type, buffer);
else
r = ca_load_fd(fd, buffer);
if (r < 0)
return r;
if (ret_effective_compression)
*ret_effective_compression = desired_compression == CA_CHUNK_AS_IS ? fd_compression : desired_compression;
return 0;
}
int ca_chunk_file_save(
int chunk_fd,
const char *prefix,
const CaChunkID *chunkid,
CaChunkCompression effective_compression,
CaChunkCompression desired_compression,
CaCompressionType compression_type,
const void *p,
uint64_t l) {
_cleanup_free_ char *suffix = NULL;
int r;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
if (desired_compression < 0)
return -EINVAL;
if (desired_compression >= _CA_CHUNK_COMPRESSION_MAX)
return -EINVAL;
if (effective_compression < 0)
return -EINVAL;
if (effective_compression >= _CA_CHUNK_COMPRESSION_MAX)
return -EINVAL;
if (effective_compression == CA_CHUNK_AS_IS)
return -EINVAL;
if (!p)
return -EINVAL;
if (l <= 0)
return -EINVAL;
r = ca_chunk_file_test(chunk_fd, prefix, chunkid);
if (r < 0)
return r;
if (r > 0)
return -EEXIST;
if (asprintf(&suffix, ".%" PRIx64 ".tmp", random_u64()) < 0)
return -ENOMEM;
_cleanup_(safe_closep) int fd =
ca_chunk_file_open(chunk_fd, prefix, chunkid, suffix, O_WRONLY|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
return fd;
if (desired_compression == CA_CHUNK_AS_IS)
desired_compression = effective_compression;
if (desired_compression == effective_compression)
r = loop_write(fd, p, l);
else if (desired_compression == CA_CHUNK_COMPRESSED)
r = ca_save_and_compress_fd(fd, compression_type, p, l);
else {
assert(desired_compression == CA_CHUNK_UNCOMPRESSED);
r = ca_save_and_decompress_fd(fd, p, l);
}
if (r < 0)
goto fail;
r = ca_chunk_file_rename(chunk_fd, prefix, chunkid, suffix, desired_compression == CA_CHUNK_COMPRESSED ? ca_compressed_chunk_suffix() : NULL);
if (r < 0)
goto fail;
return 0;
fail:
(void) ca_chunk_file_unlink(chunk_fd, prefix, chunkid, suffix);
return r;
}
int ca_chunk_file_mark_missing(int chunk_fd, const char *prefix, const CaChunkID *chunkid) {
char path[CA_CHUNK_ID_PATH_SIZE(prefix, NULL)];
bool made = false;
char *slash;
int r;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
r = ca_chunk_file_test(chunk_fd, prefix, chunkid);
if (r < 0)
return r;
if (r > 0)
return -EEXIST;
ca_chunk_id_format_path(prefix, chunkid, NULL, path);
assert_se(slash = strrchr(path, '/'));
*slash = 0;
if (mkdirat(chunk_fd, path, 0777) < 0) {
if (errno != EEXIST)
return -errno;
} else
made = true;
*slash = '/';
if (symlinkat("/dev/null", chunk_fd, path) < 0) {
r = -errno;
if (made) {
*slash = 0;
(void) unlinkat(chunk_fd, path, AT_REMOVEDIR);
}
return r;
}
return 0;
}
int ca_chunk_file_test(int chunk_fd, const char *prefix, const CaChunkID *chunkid) {
int r;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
r = ca_chunk_file_access(chunk_fd, prefix, chunkid, ca_compressed_chunk_suffix());
if (r != 0)
return r;
return ca_chunk_file_access(chunk_fd, prefix, chunkid, NULL);
}
int ca_chunk_file_remove(int chunk_fd, const char *prefix, const CaChunkID *chunkid) {
int r;
if (chunk_fd < 0 && chunk_fd != AT_FDCWD)
return -EINVAL;
if (!chunkid)
return -EINVAL;
r = ca_chunk_file_unlink(chunk_fd, prefix, chunkid, NULL);
if (r < 0 && r != -ENOENT)
return -EINVAL;
return ca_chunk_file_unlink(chunk_fd, prefix, chunkid, ca_compressed_chunk_suffix());
}