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txt.c
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txt.c
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/*
* Part of DNS zone file validator `validns`.
*
* Copyright 2011, 2012 Anton Berezin <[email protected]>
* Modified BSD license.
* (See LICENSE file in the distribution.)
*
*/
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "common.h"
#include "textparse.h"
#include "mempool.h"
#include "carp.h"
#include "rr.h"
/* XXX Does not accept multiple character-strings */
static struct rr *txt_parse(char *name, long ttl, int type, char *s)
{
struct rr_txt *rr;
struct binary_data txt[20];
int i;
i = 0;
while (*s) {
if (i >= 20)
return bitch("program limit: too many text segments");
txt[i] = extract_text(&s, "text segment");
if (txt[i].length < 0)
return NULL;
if (txt[i].length > 255)
return bitch("TXT segment too long");
i++;
}
if (i == 0)
return bitch("empty text record");
rr = getmem(sizeof(*rr) + sizeof(struct binary_data) * (i-1));
rr->count = i;
for (i = 0; i < rr->count; i++) {
rr->txt[i] = txt[i];
}
return store_record(type, name, ttl, rr);
}
static char* txt_human(struct rr *rrv)
{
RRCAST(txt);
char ss[1024];
int i;
char *s = ss;
int l;
for (i = 0; i < rr->count; i++) {
/* XXX would be nice to escape " with \ in strings */
l = snprintf(s, 1024-(s-ss), "\"%s\" ", rr->txt[i].data);
s += l;
}
return quickstrdup_temp(ss);
}
static struct binary_data txt_wirerdata(struct rr *rrv)
{
RRCAST(txt);
struct binary_data r, t;
int i;
r = bad_binary_data();
t.length = 0;
t.data = NULL;
for (i = 0; i < rr->count; i++) {
r = compose_binary_data("db", 1, t, rr->txt[i]);
t = r;
}
return r;
}
struct rr_methods txt_methods = { txt_parse, txt_human, txt_wirerdata, NULL, NULL };