bool valid_cached_file_version(const char *cachename)
{
char buffer[16];
autofclose FILE *f;
if (!(f = fopen(cachename, "r"))) {
PERROR("Error: Could not read cache file '%s', skipping...\n", cachename);
return false;
}
size_t res = fread(buffer, 1, 16, f);
if (res < 16) {
if (debug_cache)
pwarn("%s: cache file '%s' invalid size\n", progname, cachename);
return false;
}
/* 12 byte header that is always the same and then 4 byte version # */
if (memcmp(buffer, header_string, HEADER_STRING_SIZE) != 0) {
if (debug_cache)
pwarn("%s: cache file '%s' has wrong header\n", progname, cachename);
return false;
}
uint32_t version = cpu_to_le32(ENCODE_VERSION(force_complain,
policy_version,
parser_abi_version,
kernel_abi_version));
if (memcmp(buffer + 12, &version, 4) != 0) {
if (debug_cache)
pwarn("%s: cache file '%s' has wrong version\n", progname, cachename);
return false;
}
return true;
}
void set_version(little_file *self) {
int dfd, fd;
version_t version = ENCODE_VERSION(self->version);
int nextfreeblock = ENCODE_INT(self->nextfreeblock);
dfd = open(self->name, O_RDONLY);
fd = openat(dfd, version_file, O_WRONLY | O_CREAT, 0666);
close(dfd);
write(fd, &version, sizeof(version_t));
write(fd, &nextfreeblock, sizeof(int));
close(fd);
}
void sd_serialize_top_profile(std::ostringstream &buf, Profile *profile)
{
uint32_t version;
version = ENCODE_VERSION(force_complain, policy_version,
parser_abi_version, kernel_abi_version);
sd_write_name(buf, "version");
sd_write_uint32(buf, version);
if (profile->ns) {
sd_write_string(buf, profile->ns, "namespace");
}
sd_serialize_profile(buf, profile, profile->parent ? 1 : 0);
}
static int write_block(const char* path, int block, const char* buffer, version_t version) {
int dfd, fd, res, err;
char name[LITTLE_MAX_PATH];
trace("W %d %s\n", block, path);
dfd = open(path,O_RDONLY);
if (dfd == -1) { perror(NULL); return -errno;}
snprintf(name,sizeof(name),"%d", block);
fd = openat(dfd,name,O_WRONLY|O_CREAT,0666);
close(dfd);
if (fd == -1) { perror(NULL); return -errno;}
version = ENCODE_VERSION(version);
res = write(fd, &version, sizeof(version_t));
if (res == -1) {
err=errno;
close(fd);
return -err;
}
res = write(fd, buffer, LITTLE_SECTOR_SIZE);
fsync(fd);
close(fd);
if (res == -1) { perror(NULL); return -errno;}
return res;
}