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/* combined dataset, one file is a collection of various datasets
* and subzones. Special case.
*/
#include <string.h>
#include <syslog.h>
#include <stdlib.h>
#include "rbldnsd.h"
/* Special "dataset", which does NOT contain any data itself,
* but contains several datasets of other types instead.
* Operations:
* we have a list of datasets in dslist, that contains
* our data (subdataset)
* when loading, we have current dataset in dssub, which
* will be called to parse a line
* we have a list of subzones in zlist for query
*/
struct dsdata {
struct dataset *dslist; /* list of subzone datasets */
struct dataset **dslastp; /* where to connect next dataset */
unsigned nds; /* number of datasets in dslist */
struct dataset *sdslist; /* saved datasets list */
struct zone *zlist; /* list of subzones */
};
definedstype(combined, DSTF_SPECIAL, "several datasets/subzones combined");
static void ds_combined_reset(struct dsdata *dsd, int freeall) {
struct dataset *dslist = dsd->dslist;
while(dslist) {
struct dataset *ds = dslist;
dslist = dslist->ds_next;
ds->ds_type->dst_resetfn(ds->ds_dsd, freeall);
if (freeall) free(ds);
}
dslist = dsd->sdslist;
while(dslist) {
struct dataset *ds = dslist;
dslist = dslist->ds_next;
ds->ds_type->dst_resetfn(ds->ds_dsd, 1);
free(ds);
}
dslist = dsd->dslist;
memset(dsd, 0, sizeof(*dsd));
if (!freeall) dsd->sdslist = dslist;
dsd->dslastp = &dsd->dslist;
}
static int
ds_combined_line(struct dataset UNUSED *unused_ds,
char UNUSED *unused_s, struct dsctx *dsc) {
dslog(LOG_ERR, dsc, "invalid/unrecognized entry - specify $DATASET line");
return 0;
}
static void ds_combined_finishlast(struct dsctx *dsc) {
struct dataset *dssub = dsc->dsc_subset;
if (dssub) {
const char *fname = dsc->dsc_fname;
dsc->dsc_fname = NULL;
dssub->ds_type->dst_finishfn(dssub, dsc);
dsc->dsc_subset = NULL;
dsc->dsc_fname = fname;
}
}
static void ds_combined_start(struct dataset UNUSED *ds) {
}
static void ds_combined_finish(struct dataset *ds, struct dsctx *dsc) {
struct dsdata *dsd = ds->ds_dsd;
struct zone *zone;
unsigned nzones;
ds_combined_finishlast(dsc);
for(nzones = 0, zone = dsd->zlist; zone; zone = zone->z_next)
++nzones;
dsloaded(dsc, "subzones=%u datasets=%u", nzones, dsd->nds);
}
int ds_combined_newset(struct dataset *ds, char *line, struct dsctx *dsc) {
char *p;
const char *const space = " \t";
struct dsdata *dsd = ds->ds_dsd;
struct dataset *dssub;
struct dslist *dsl;
struct zone *zone;
unsigned char dn[DNS_MAXDN];
unsigned dnlen;
char *name;
ds_combined_finishlast(dsc);
/* remove comment. only recognize # after a space. */
for (p = line; *p; ++p)
if (ISCOMMENT(*p) && (p == line || ISSPACE(p[-1]))) {
*p = '\0';
break;
}
p = strtok(line, space); /* dataset type */
if (!p) return 0;
if ((name = strchr(p, ':')) != NULL)
*name++ = '\0';
for(;;) { /* search appropriate dataset */
if (!(dssub = dsd->sdslist)) {
/* end of the saved list, allocate new dataset */
const struct dstype **dstp = ds_types, *dst;
dstp = ds_types;
while(strcmp(p, (*dstp)->dst_name))
if (!*++dstp) {
dslog(LOG_ERR, dsc, "unknown dataset type `%.60s'", p);
return -1;
}
dst = *dstp;
if (dst->dst_flags & DSTF_SPECIAL) {
dslog(LOG_ERR, dsc,
"dataset type `%s' cannot be used inside `combined'",
dst->dst_name);
return -1;
}
dssub = (struct dataset *)
ezalloc(sizeof(struct dataset) + dst->dst_size);
if (!dssub)
return -1;
dssub->ds_type = dst;
dssub->ds_dsd = (struct dsdata *)(dssub + 1);
dssub->ds_mp = ds->ds_mp; /* use parent memory pool */
break;
}
else if (strcmp(dssub->ds_type->dst_name, p) == 0) {
/* reuse existing one */
dsd->sdslist = dssub->ds_next;
break;
}
else {
/* entry is of different type, free it and try next one */
dsd->sdslist = dssub->ds_next;
dssub->ds_type->dst_resetfn(dssub->ds_dsd, 1);
free(dssub);
}
}
dssub->ds_next = NULL;
*dsd->dslastp = dssub;
dsd->dslastp = &dssub->ds_next;
if (name && *name) {
if (strlen(name) > 20) name[20] = '\0';
if (!(dssub->ds_spec = mp_strdup(ds->ds_mp, name)))
return -1;
}
if (!(p = strtok(NULL, space)))
dswarn(dsc, "no subzone(s) specified for dataset, data will be ignored");
else do {
if (p[0] == '@' && p[1] == '\0') {
dn[0] = '\0';
dnlen = 1;
}
else if (!(dnlen = dns_ptodn(p, dn, sizeof(dn)))) {
dswarn(dsc, "invalid domain name `%.60s'", p);
continue;
}
else
dns_dntol(dn, dn);
zone = newzone(&dsd->zlist, dn, dnlen, ds->ds_mp);
dsl = mp_talloc(ds->ds_mp, struct dslist);
if (!zone || !dsl) return -1;
connectdataset(zone, dssub, dsl);
} while((p = strtok(NULL, space)) != NULL);
++dsd->nds;
dsc->dsc_subset = dssub;
dssub->ds_type->dst_resetfn(dssub->ds_dsd, 0);
dssub->ds_ttl = ds->ds_ttl;
memcpy(dssub->ds_subst, ds->ds_subst, sizeof(ds->ds_subst));
dssub->ds_type->dst_startfn(dssub);
return 1;
}
static int
ds_combined_query(const struct dataset *ds, const struct dnsqinfo *qi,
struct dnspacket *pkt) {
struct dnsqinfo sqi;
const struct dslist *dsl;
int found = 0;
const struct zone *zone =
findqzone(ds->ds_dsd->zlist,
qi->qi_dnlen0 + 1, qi->qi_dnlab, qi->qi_dnlptr,
&sqi);
if (!zone) return 0;
sqi.qi_tflag = qi->qi_tflag;
for (dsl = zone->z_dsl; dsl; dsl = dsl->dsl_next)
found |= dsl->dsl_queryfn(dsl->dsl_ds, &sqi, pkt);
/* if it was a query for our base subzone, always return `found' */
return found | (sqi.qi_dnlab ? 0 : NSQUERY_FOUND);
}
#ifndef NO_MASTER_DUMP
static void
ds_combined_dump(const struct dataset *ds, const unsigned char *odn, FILE *f) {
char bname[DNS_MAXDOMAIN+1], sname[DNS_MAXDOMAIN+1];
const struct zone *zone;
const struct dslist *dsl;
dns_dntop(odn, bname, DNS_MAXDOMAIN + 1);
for(zone = ds->ds_dsd->zlist; zone; zone = zone->z_next) {
if (zone->z_dnlen == 1)
fprintf(f, "$ORIGIN %s.\n", bname);
else {
dns_dntop(zone->z_dn, sname, DNS_MAXDOMAIN + 1);
fprintf(f, "$ORIGIN %s.%s.\n", sname, bname);
}
for(dsl = zone->z_dsl; dsl; dsl = dsl->dsl_next)
dsl->dsl_ds->ds_type->dst_dumpfn(dsl->dsl_ds, NULL/*XXX*/, f);
}
}
#endif
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