const HParser *init_parser(void)
{
// CORE
H_RULE (digit, h_ch_range(0x30, 0x39));
H_RULE (alpha, h_choice(h_ch_range(0x41, 0x5a), h_ch_range(0x61, 0x7a), NULL));
H_RULE (space, h_in((uint8_t *)" \t\n\r\f\v", 6));
// AUX.
H_RULE (plus, h_ch('+'));
H_RULE (slash, h_ch('/'));
H_ARULE(equals, h_ch('='));
H_ARULE(bsfdig, h_choice(alpha, digit, plus, slash, NULL));
H_ARULE(bsfdig_4bit, h_in((uint8_t *)"AEIMQUYcgkosw048", 16));
H_ARULE(bsfdig_2bit, h_in((uint8_t *)"AQgw", 4));
H_ARULE(base64_3, h_repeat_n(bsfdig, 4));
H_ARULE(base64_2, h_sequence(bsfdig, bsfdig, bsfdig_4bit, equals, NULL));
H_ARULE(base64_1, h_sequence(bsfdig, bsfdig_2bit, equals, equals, NULL));
H_ARULE(base64, h_sequence(h_many(base64_3),
h_optional(h_choice(base64_2,
base64_1, NULL)),
NULL));
H_ARULE(ws, h_many(space));
H_ARULE(document, h_sequence(ws, base64, ws, h_end_p(), NULL));
// BUG sometimes inputs that should just don't parse.
// It *seemed* to happen mostly with things like "bbbbaaaaBA==".
// Using less actions seemed to make it less likely.
return document;
}
void dnp3_p_init_binoutcmd(void)
{
H_RULE (bit, h_bits(1, false));
H_RULE (cs, bit);
H_RULE (status, h_bits(7, false));
H_ARULE(notime, h_sequence(status, cs, NULL));
H_ARULE(abstime, h_sequence(status, cs, dnp3_p_dnp3time, NULL));
H_RULE (tcc, h_int_range(h_bits(2, false), 0, 2));
H_ARULE(crob, h_sequence(h_bits(4, false), // op type
bit, // queue flag (obsolete)
bit, // clear flag
tcc,
h_uint8(), // count
h_uint32(), // on-time [ms]
h_uint32(), // off-time [ms]
status, // 7 bits
dnp3_p_reserved(1),
NULL));
H_ARULE(packed, bit);
// group 12 (binary output commands)...
dnp3_p_g12v1_binoutcmd_crob_oblock = dnp3_p_oblock(G_V(BINOUTCMD, CROB), crob);
dnp3_p_g12v2_binoutcmd_pcb_oblock = dnp3_p_single(G_V(BINOUTCMD, PCB), crob);
dnp3_p_g12v3_binoutcmd_pcm_oblock = dnp3_p_oblock_packed(G_V(BINOUTCMD, PCM), packed);
dnp3_p_g12v3_binoutcmd_pcm_rblock = dnp3_p_specific_rblock(G_V(BINOUTCMD, PCM));
dnp3_p_binoutcmd_rblock = dnp3_p_rblock(G(BINOUTCMD),
V(BINOUTCMD, CROB),
V(BINOUTCMD, PCB),
V(BINOUTCMD, PCM), 0);
// group 13 (binary output command events)...
H_RULE(oblock_notime, dnp3_p_oblock(G_V(BINOUTCMDEV, NOTIME), notime));
H_RULE(oblock_abstime, dnp3_p_oblock(G_V(BINOUTCMDEV, ABSTIME), abstime));
dnp3_p_binoutcmdev_rblock = dnp3_p_rblock(G(BINOUTCMDEV),
V(BINOUTCMDEV, NOTIME),
V(BINOUTCMDEV, ABSTIME), 0);
dnp3_p_binoutcmdev_oblock = h_choice(oblock_notime,
oblock_abstime, NULL);
}
void dnp3_p_init_transport(void)
{
H_RULE(bit, h_bits(1, false));
H_RULE(byte, h_uint8());
H_RULE(fir, bit);
H_RULE(fin, bit);
H_RULE(seqno, h_bits(6, false));
H_RULE(hdr, h_sequence(fin, fir, seqno, NULL)); // big-endian
H_ARULE(segment, h_sequence(hdr, h_many(byte), NULL));
// XXX is there a minimum number of bytes in the transport payload?
dnp3_p_transport_segment = segment;
}
HParser* init_domain() {
static HParser *ret = NULL;
if (ret)
return ret;
H_RULE (letter, h_choice(h_ch_range('a','z'), h_ch_range('A','Z'), NULL));
H_RULE (let_dig, h_choice(letter, h_ch_range('0','9'), NULL));
H_RULE (ldh_str, h_many1(h_choice(let_dig, h_ch('-'), NULL)));
H_VARULE(label, h_sequence(letter,
h_optional(h_sequence(h_optional(ldh_str),
let_dig,
NULL)),
NULL));
H_RULE (subdomain, h_sepBy1(label, h_ch('.')));
H_ARULE (domain, h_choice(subdomain, h_ch(' '), NULL));
ret = domain;
return ret;
}
void dnp3_p_init_counter(void)
{
H_RULE (bit, h_bits(1,false));
H_RULE (ignore, h_ignore(bit));
H_RULE (reserved, dnp3_p_reserved(1));
H_ARULE(flags, h_sequence(bit, // ONLINE
bit, // RESTART
bit, // COMM_LOST
bit, // REMOTE_FORCED
bit, // LOCAL_FORCED
ignore, // (ROLLOVER - obsolete)
bit, // DISCONTINUITY
reserved,
NULL));
H_RULE (val32, h_uint32());
H_RULE (val16, h_uint16());
H_ARULE(ctr32, val32);
H_ARULE(ctr16, val16);
H_ARULE(ctr32_flag, h_sequence(flags, val32, NULL));
H_ARULE(ctr16_flag, h_sequence(flags, val16, NULL));
H_ARULE(ctr32_flag_t, h_sequence(flags, val32, dnp3_p_dnp3time, NULL));
H_ARULE(ctr16_flag_t, h_sequence(flags, val16, dnp3_p_dnp3time, NULL));
// group 20: counters...
H_RULE(oblock_32bit_flag, dnp3_p_oblock(G_V(CTR, 32BIT), ctr32_flag));
H_RULE(oblock_16bit_flag, dnp3_p_oblock(G_V(CTR, 16BIT), ctr16_flag));
H_RULE(oblock_32bit_noflag, dnp3_p_oblock(G_V(CTR, 32BIT_NOFLAG), ctr32));
H_RULE(oblock_16bit_noflag, dnp3_p_oblock(G_V(CTR, 16BIT_NOFLAG), ctr16));
dnp3_p_ctr_rblock = dnp3_p_rblock(G(CTR), V(CTR, 32BIT),
V(CTR, 16BIT),
V(CTR, 32BIT_NOFLAG),
V(CTR, 32BIT_NOFLAG), 0);
dnp3_p_ctr_fblock = dnp3_p_specific_rblock(G(CTR), DNP3_VARIATION_ANY);
dnp3_p_ctr_oblock = h_choice(oblock_32bit_flag,
oblock_16bit_flag,
oblock_32bit_noflag,
oblock_16bit_noflag,
NULL);
// group 21: frozen counters...
H_RULE(oblock_frz32bit_flag, dnp3_p_oblock(G_V(FROZENCTR, 32BIT), ctr32_flag));
H_RULE(oblock_frz16bit_flag, dnp3_p_oblock(G_V(FROZENCTR, 16BIT), ctr16_flag));
H_RULE(oblock_frz32bit_flag_t, dnp3_p_oblock(G_V(FROZENCTR, 32BIT_TIME), ctr32_flag_t));
H_RULE(oblock_frz16bit_flag_t, dnp3_p_oblock(G_V(FROZENCTR, 16BIT_TIME), ctr16_flag_t));
H_RULE(oblock_frz32bit_noflag, dnp3_p_oblock(G_V(FROZENCTR, 32BIT_NOFLAG), ctr32));
H_RULE(oblock_frz16bit_noflag, dnp3_p_oblock(G_V(FROZENCTR, 16BIT_NOFLAG), ctr16));
dnp3_p_frozenctr_rblock = dnp3_p_rblock(G(FROZENCTR),
V(FROZENCTR, 32BIT),
V(FROZENCTR, 16BIT),
V(FROZENCTR, 32BIT_TIME),
V(FROZENCTR, 16BIT_TIME),
V(FROZENCTR, 32BIT_NOFLAG),
V(FROZENCTR, 32BIT_NOFLAG), 0);
dnp3_p_frozenctr_oblock = h_choice(oblock_frz32bit_flag,
oblock_frz16bit_flag,
oblock_frz32bit_flag_t,
oblock_frz16bit_flag_t,
oblock_frz32bit_noflag,
oblock_frz16bit_noflag,
NULL);
// group 22: counter events...
H_RULE(oblock_ev32bit_flag, dnp3_p_oblock(G_V(CTREV, 32BIT), ctr32_flag));
H_RULE(oblock_ev16bit_flag, dnp3_p_oblock(G_V(CTREV, 16BIT), ctr16_flag));
H_RULE(oblock_ev32bit_flag_t, dnp3_p_oblock(G_V(CTREV, 32BIT_TIME), ctr32_flag_t));
H_RULE(oblock_ev16bit_flag_t, dnp3_p_oblock(G_V(CTREV, 16BIT_TIME), ctr16_flag_t));
dnp3_p_ctrev_rblock = dnp3_p_rblock(G(CTREV), V(CTREV, 32BIT),
V(CTREV, 16BIT),
V(CTREV, 32BIT_TIME),
V(CTREV, 16BIT_TIME), 0);
dnp3_p_ctrev_oblock = h_choice(oblock_ev32bit_flag,
oblock_ev16bit_flag,
oblock_ev32bit_flag_t,
oblock_ev16bit_flag_t,
NULL);
// group 21: frozen counter events...
H_RULE(oblock_frzev32bit_flag, dnp3_p_oblock(G_V(FROZENCTREV, 32BIT), ctr32_flag));
H_RULE(oblock_frzev16bit_flag, dnp3_p_oblock(G_V(FROZENCTREV, 16BIT), ctr16_flag));
H_RULE(oblock_frzev32bit_flag_t, dnp3_p_oblock(G_V(FROZENCTREV, 32BIT_TIME), ctr32_flag_t));
H_RULE(oblock_frzev16bit_flag_t, dnp3_p_oblock(G_V(FROZENCTREV, 16BIT_TIME), ctr16_flag_t));
dnp3_p_frozenctrev_rblock = dnp3_p_rblock(G(FROZENCTREV),
V(FROZENCTREV, 32BIT),
V(FROZENCTREV, 16BIT),
V(FROZENCTREV, 32BIT_TIME),
V(FROZENCTREV, 16BIT_TIME), 0);
dnp3_p_frozenctrev_oblock = h_choice(oblock_frzev32bit_flag,
oblock_frzev16bit_flag,
oblock_frzev32bit_flag_t,
oblock_frzev16bit_flag_t,
NULL);
}
const HParser* init_rdata(uint16_t type) {
static const 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; i<sizeof(parsers); i++) {
if(parsers[i]) {
parsers[i] = h_action(h_sequence(parsers[i], h_end_p(), NULL),
act_index0);
}
}
inited = 1;
return parsers[type];
}
