hammer/examples/rr.c

#include "../src/hammer.h"
#include "dns_common.h"
#include "dns.h"
#include "rr.h"

#define false 0
#define true 1


///
// Validations and Semantic Actions
///

bool validate_null(HParseResult *p) {
  if (TT_SEQUENCE != p->ast->token_type)
    return false;
  return (65536 > p->ast->seq->used);
}

HParsedToken *act_null(const HParseResult *p) {
  dns_rr_null_t *null = H_ALLOC(dns_rr_null_t);

  size_t len = h_seq_len(p->ast);
  uint8_t *buf = h_arena_malloc(p->arena, sizeof(uint8_t)*len);
  for (size_t i=0; i<len; ++i)
    buf[i] = H_FIELD_UINT(i);

  return H_MAKE(dns_rr_null_t, null);
}

HParsedToken *act_txt(const HParseResult *p) {
  dns_rr_txt_t *txt = H_ALLOC(dns_rr_txt_t);

  const HCountedArray *arr = H_CAST_SEQ(p->ast);
  uint8_t **ret = h_arena_malloc(arr->arena, sizeof(uint8_t*)*arr->used);
  for (size_t i=0; i<arr->used; ++i) {
    size_t len = h_seq_len(arr->elements[i]);
    uint8_t *tmp = h_arena_malloc(arr->arena, sizeof(uint8_t)*len);
    for (size_t j=0; j<len; ++j)
      tmp[j] = H_INDEX_UINT(arr->elements[i], j);
    ret[i] = tmp;
  }

  txt->count = arr->used;
  txt->txt_data = ret;

  return H_MAKE(dns_rr_txt_t, txt);
}

HParsedToken* act_cstr(const HParseResult *p) {
  dns_cstr_t *cs = H_ALLOC(dns_cstr_t);

  const HCountedArray *arr = H_CAST_SEQ(p->ast);
  uint8_t *ret = h_arena_malloc(arr->arena, sizeof(uint8_t)*arr->used);
  for (size_t i=0; i<arr->used; ++i)
    ret[i] = H_CAST_UINT(arr->elements[i]);
  assert(ret[arr->used-1] == '\0'); // XXX Is this right?! If so, shouldn't it be a validation?
  *cs = ret;

  return H_MAKE(dns_cstr_t, cs);
}

HParsedToken* act_soa(const HParseResult *p) {
  dns_rr_soa_t *soa = H_ALLOC(dns_rr_soa_t);

  soa->mname   = *H_FIELD(dns_domain_t, 0);
  soa->rname   = *H_FIELD(dns_domain_t, 1);
  soa->serial  = H_FIELD_UINT(2);
  soa->refresh = H_FIELD_UINT(3);
  soa->retry   = H_FIELD_UINT(4);
  soa->expire  = H_FIELD_UINT(5);
  soa->minimum = H_FIELD_UINT(6);

  return H_MAKE(dns_rr_soa_t, soa);
}

HParsedToken* act_wks(const HParseResult *p) {
  dns_rr_wks_t *wks = H_ALLOC(dns_rr_wks_t);

  wks->address  = H_FIELD_UINT(0);
  wks->protocol = H_FIELD_UINT(1);
  wks->len      = H_FIELD_SEQ(2)->used;
  wks->bit_map  = h_arena_malloc(p->arena, sizeof(uint8_t)*wks->len);
  for (size_t i=0; i<wks->len; ++i)
    wks->bit_map[i] = H_INDEX_UINT(p->ast, 2, i);

  return H_MAKE(dns_rr_wks_t, wks);
}

HParsedToken* act_hinfo(const HParseResult *p) {
  dns_rr_hinfo_t *hinfo = H_ALLOC(dns_rr_hinfo_t);

  hinfo->cpu = *H_FIELD(dns_cstr_t, 0);
  hinfo->os  = *H_FIELD(dns_cstr_t, 1);

  return H_MAKE(dns_rr_hinfo_t, hinfo);
}

HParsedToken* act_minfo(const HParseResult *p) {
  dns_rr_minfo_t *minfo = H_ALLOC(dns_rr_minfo_t);

  minfo->rmailbx = *H_FIELD(dns_domain_t, 0);
  minfo->emailbx = *H_FIELD(dns_domain_t, 1);

  return H_MAKE(dns_rr_minfo_t, minfo);
}

HParsedToken* act_mx(const HParseResult *p) {
  dns_rr_mx_t *mx = H_ALLOC(dns_rr_mx_t);

  mx->preference = H_FIELD_UINT(0);
  mx->exchange   = *H_FIELD(dns_domain_t, 1);

  return H_MAKE(dns_rr_mx_t, mx);
}


///
// Parsers for all types of RDATA
///

#define RDATA_TYPE_MAX 16
HParser* init_rdata(uint16_t type) {
  static HParser *parsers[RDATA_TYPE_MAX+1];
  static int inited = 0;

  if (type >= sizeof(parsers))
    return NULL;
  
  if (inited)
    return parsers[type];


  H_RULE (domain, init_domain());
  H_ARULE(cstr,   init_character_string());

  H_RULE (a,      h_uint32());
  H_RULE (ns,     domain);
  H_RULE (md,     domain);
  H_RULE (mf,     domain);
  H_RULE (cname,  domain);
  H_ARULE(soa,    h_sequence(domain,     // MNAME
			     domain,     // RNAME
			     h_uint32(), // SERIAL
			     h_uint32(), // REFRESH
			     h_uint32(), // RETRY
			     h_uint32(), // EXPIRE
			     h_uint32(), // MINIMUM
			     NULL));
  H_RULE (mb,     domain);
  H_RULE (mg,     domain);
  H_RULE (mr,     domain);
  H_VRULE(null,   h_many(h_uint8()));
  H_RULE (wks,    h_sequence(h_uint32(),
			     h_uint8(),
			     h_many(h_uint8()),
			     NULL));
  H_RULE (ptr,    domain);
  H_RULE (hinfo,  h_sequence(cstr, cstr, NULL));
  H_RULE (minfo,  h_sequence(domain, domain, NULL));
  H_RULE (mx,     h_sequence(h_uint16(), domain, NULL));
  H_ARULE(txt,    h_many1(cstr));


  parsers[ 0] = NULL;            // there is no type 0
  parsers[ 1] = a;
  parsers[ 2] = ns;
  parsers[ 3] = md;
  parsers[ 4] = mf;
  parsers[ 5] = cname;
  parsers[ 6] = soa;
  parsers[ 7] = mb;
  parsers[ 8] = mg;
  parsers[ 9] = mr;
  parsers[10] = null;
  parsers[11] = wks;
  parsers[12] = ptr;
  parsers[13] = hinfo;
  parsers[14] = minfo;
  parsers[15] = mx;
  parsers[16] = txt;

  // All parsers must consume their input exactly.
  for(uint16_t i = 0; i<RDATA_TYPE_MAX+1; i++) {
    if(parsers[i]) {
      parsers[i] = h_action(h_sequence(parsers[i], h_end_p(), NULL),
			    act_index0);
    }
  }

  inited = 1;
  return parsers[type];
}