File: rbldnsd_combined.c

package info (click to toggle)
rbldnsd 0.998b~pre1-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, stretch
  • size: 744 kB
  • ctags: 1,132
  • sloc: ansic: 8,212; python: 549; sh: 502; makefile: 249; awk: 33
file content (225 lines) | stat: -rw-r--r-- 6,565 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/* 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