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/* ISC license. */
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <skalibs/posixishard.h>
#include <skalibs/uint16.h>
#include <skalibs/uint64.h>
#include <skalibs/buffer.h>
#include <skalibs/tai.h>
#include <skalibs/djbunix.h>
#include <s6-dns/dcache.h>
static inline int dcache_load_node (dcache_t *z, uint64_t max, buffer *b)
{
tain_t entry = { .nano = 0 } ;
tain_t expire = { .nano = 0 } ;
uint16_t keylen ;
uint16_t datalen ;
char pack[TAI_PACK * 2 + 4] ;
ssize_t r = buffer_get(b, pack, TAI_PACK * 2 + 4) ;
if (!r) return 0 ;
if (r < TAI_PACK * 2 + 4) return -1 ;
tai_unpack(pack, tain_secp(&entry)) ;
tai_unpack(pack + TAI_PACK, tain_secp(&expire)) ;
uint16_unpack_big(pack + TAI_PACK * 2, &keylen) ;
uint16_unpack_big(pack + TAI_PACK * 2 + 2, &datalen) ;
{
uint32_t len = (uint32_t)keylen + (uint32_t)datalen ;
char blob[len+1] ; /* 128 kB max, it's ok */
r = buffer_get(b, blob, len+1) ;
if (!r) return (errno = EPIPE, -1) ;
if (r < len) return -1 ;
if (blob[len]) return (errno = EPROTO, -1) ;
if (!dcache_add(z, max, blob, keylen, blob + keylen, datalen, &expire, &entry)) return -1 ;
}
return 1 ;
}
static inline int dcache_load_from_buffer (dcache_t *z, uint64_t max, buffer *b)
{
{
char banner[sizeof(DCACHE_MAGIC) - 1] ;
char pack[8] ;
if (buffer_get(b, banner, sizeof(DCACHE_MAGIC) - 1) < sizeof(DCACHE_MAGIC) - 1)
return 0 ;
if (memcmp(banner, DCACHE_MAGIC, sizeof(DCACHE_MAGIC) - 1)) return 0 ;
if (buffer_get(b, pack, 8) < 8) return 0 ;
uint64_unpack_big(pack, &z->size) ;
if (buffer_get(b, pack, 8) < 8) return 0 ;
uint64_unpack_big(pack, &z->motion) ;
}
for (;;)
{
int r = dcache_load_node(z, max, b) ;
if (r < 0) return 0 ;
if (!r) break ;
}
return 1 ;
}
#define N 8192
int dcache_load (dcache_t *z, uint64_t max, char const *file)
{
char buf[N] ;
buffer b ;
int fd = open_readb(file) ;
if (fd == -1) return 0 ;
buffer_init(&b, &buffer_read, fd, buf, N) ;
if (!dcache_load_from_buffer(z, max, &b)) goto err ;
fd_close(fd) ;
return 1 ;
err:
dcache_free(z) ;
fd_close(fd) ;
return 0 ;
}
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