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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 3 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <inttypes.h> // PRIu64
#include <unistd.h> // sysconf
#include <stdio.h> // sprintf
#include <stdlib.h> // free
#include <stdbool.h> // bool
#include <string.h> // strlen
#include <fcntl.h> // open
#include <sys/stat.h> // fstat
#include <sys/mman.h> // mmap
#include "zscanner/file_loader.h"
#include "zscanner/error.h" // error codes
/*! \brief Mmap block size in bytes. This value is then adjusted to the
* multiple of memory pages which fit in.
*/
#define BLOCK_SIZE 30000000
file_loader_t* file_loader_create(const char *file_name,
const char *origin,
const uint16_t rclass,
const uint32_t ttl,
void (*process_record)(const scanner_t *),
void (*process_error)(const scanner_t *),
void *data)
{
// Creating zeroed structure.
file_loader_t *fl = calloc(1, sizeof(file_loader_t));
if (fl == NULL) {
return NULL;
}
// Copying file name.
fl->file_name = strdup(file_name);
// Opening zone file.
fl->fd = open(fl->file_name, O_RDONLY);
if (fl->fd == -1) {
free(fl->file_name);
free(fl);
return NULL;
}
// Creating zone scanner.
fl->scanner = scanner_create(fl->file_name, origin, rclass, ttl,
process_record, process_error, data);
if (fl->scanner == NULL) {
close(fl->fd);
free(fl->file_name);
free(fl);
return NULL;
}
return fl;
}
void file_loader_free(file_loader_t *fl)
{
close(fl->fd);
free(fl->file_name);
scanner_free(fl->scanner);
free(fl);
}
int file_loader_process(file_loader_t *fl)
{
int ret = 0;
char *data; // Mmaped data.
bool is_last_block;
long page_size;
uint64_t n_blocks;
uint64_t block_id;
uint64_t default_block_size;
uint64_t scanner_start; // Current block start to scan.
uint64_t block_size; // Current block size to scan.
struct stat file_stat;
// Last block - secure termination of zone file.
char *zone_termination = "\n";
// Getting OS page size.
page_size = sysconf(_SC_PAGESIZE);
// Getting file information.
if (fstat(fl->fd, &file_stat) == -1) {
return FLOADER_EFSTAT;
}
// Check for directory.
if (S_ISDIR(file_stat.st_mode)) {
return FLOADER_EDIRECTORY;
}
// Check for empty file.
if (file_stat.st_size == 0) {
return FLOADER_EEMPTY;
}
// Block size adjustment to multiple of page size.
default_block_size = (BLOCK_SIZE / page_size) * page_size;
// Number of blocks which cover the whole file (ceiling operation).
n_blocks = 1 + ((file_stat.st_size - 1) / default_block_size);
// Loop over zone file blocks.
for (block_id = 0; block_id < n_blocks; block_id++) {
scanner_start = block_id * default_block_size;
is_last_block = false;
block_size = default_block_size;
// The last block is probably shorter.
if (block_id == (n_blocks - 1)) {
block_size = file_stat.st_size - scanner_start;
is_last_block = true;
}
// Zone file block mapping.
data = mmap(0,
block_size,
PROT_READ,
MAP_SHARED,
fl->fd,
scanner_start);
if (data == MAP_FAILED) {
return FLOADER_EMMAP;
}
// Scan zone file.
ret = scanner_process(data,
data + block_size,
false,
fl->scanner);
// Artificial last block containing newline char only.
if (is_last_block == true && fl->scanner->stop == 0) {
ret = scanner_process(zone_termination,
zone_termination + 1,
true,
fl->scanner);
}
// Zone file block unmapping.
if (munmap(data, block_size) == -1) {
return FLOADER_EMUNMAP;
}
}
// Check for scanner return.
if (ret != 0) {
return FLOADER_ESCANNER;
}
return ZSCANNER_OK;
}
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