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str2wire.c
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str2wire.c
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/**
* str2wire.c - read txt presentation of RRs
*
* (c) NLnet Labs, 2005-2006
*
* See the file LICENSE for the license
*/
/**
* \file
*
* Parses text to wireformat.
*/
#include "config.h"
#include "gldns/str2wire.h"
#include "gldns/wire2str.h"
#include "gldns/gbuffer.h"
#include "gldns/parse.h"
#include "gldns/parseutil.h"
#include <ctype.h>
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <stdlib.h>
/** bits for the offset */
#define RET_OFFSET_MASK (((unsigned)(~GLDNS_WIREPARSE_MASK))>>GLDNS_WIREPARSE_SHIFT)
/** return an error */
#define RET_ERR(e, off) ((int)(((e)&GLDNS_WIREPARSE_MASK)|(((off)&RET_OFFSET_MASK)<<GLDNS_WIREPARSE_SHIFT)))
/** Move parse error but keep its ID */
#define RET_ERR_SHIFT(e, move) RET_ERR(GLDNS_WIREPARSE_ERROR(e), GLDNS_WIREPARSE_OFFSET(e)+(move));
/*
* No special care is taken, all dots are translated into
* label separators.
* @param rel: true if the domain is not absolute (not terminated in .).
* The output is then still terminated with a '0' rootlabel.
*/
static int gldns_str2wire_dname_buf_rel(const char* str, uint8_t* buf,
size_t* olen, int* rel)
{
size_t len;
const char *s;
uint8_t *q, *pq, label_len;
if(rel) *rel = 0;
len = strlen((char*)str);
/* octet representation can make strings a lot longer than actual length */
if (len > GLDNS_MAX_DOMAINLEN * 4) {
return RET_ERR(GLDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, 0);
}
if (0 == len) {
return RET_ERR(GLDNS_WIREPARSE_ERR_DOMAINNAME_UNDERFLOW, 0);
}
/* root label */
if (1 == len && *str == '.') {
if(*olen < 1)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, 0);
buf[0] = 0;
*olen = 1;
return GLDNS_WIREPARSE_ERR_OK;
}
/* get on with the rest */
/* s is on the current character in the string
* pq points to where the labellength is going to go
* label_len keeps track of the current label's length
* q builds the dname inside the buf array
*/
len = 0;
if(*olen < 1)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, 0);
q = buf+1;
pq = buf;
label_len = 0;
for (s = str; *s; s++, q++) {
if (q >= buf + *olen)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, q-buf);
if (q >= buf + GLDNS_MAX_DOMAINLEN)
return RET_ERR(GLDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, q-buf);
switch (*s) {
case '.':
if (label_len > GLDNS_MAX_LABELLEN) {
return RET_ERR(GLDNS_WIREPARSE_ERR_LABEL_OVERFLOW, q-buf);
}
if (label_len == 0) {
return RET_ERR(GLDNS_WIREPARSE_ERR_EMPTY_LABEL, q-buf);
}
len += label_len + 1;
*q = 0;
*pq = label_len;
label_len = 0;
pq = q;
break;
case '\\':
/* octet value or literal char */
s += 1;
if (!gldns_parse_escape(q, &s)) {
*q = 0;
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE, q-buf);
}
s -= 1;
label_len++;
break;
default:
*q = (uint8_t)*s;
label_len++;
}
}
/* add root label if last char was not '.' */
if(label_len != 0) {
if(rel) *rel = 1;
if (q >= buf + *olen)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, q-buf);
if (q >= buf + GLDNS_MAX_DOMAINLEN) {
return RET_ERR(GLDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, q-buf);
}
if (label_len > GLDNS_MAX_LABELLEN) {
return RET_ERR(GLDNS_WIREPARSE_ERR_LABEL_OVERFLOW, q-buf);
}
if (label_len == 0) { /* label_len 0 but not . at end? */
return RET_ERR(GLDNS_WIREPARSE_ERR_EMPTY_LABEL, q-buf);
}
len += label_len + 1;
*pq = label_len;
*q = 0;
}
len++;
*olen = len;
return GLDNS_WIREPARSE_ERR_OK;
}
int gldns_str2wire_dname_buf(const char* str, uint8_t* buf, size_t* len)
{
return gldns_str2wire_dname_buf_rel(str, buf, len, NULL);
}
int gldns_str2wire_dname_buf_origin(const char* str, uint8_t* buf, size_t* len,
uint8_t* origin, size_t origin_len)
{
size_t dlen = *len;
int rel = 0;
int s = gldns_str2wire_dname_buf_rel(str, buf, &dlen, &rel);
if(s) return s;
if(rel && origin && dlen > 0) {
if((unsigned)dlen >= 0x00ffffffU ||
(unsigned)origin_len >= 0x00ffffffU)
/* guard against integer overflow in addition */
return RET_ERR(GLDNS_WIREPARSE_ERR_GENERAL, *len);
if(dlen + origin_len - 1 > GLDNS_MAX_DOMAINLEN)
return RET_ERR(GLDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW,
GLDNS_MAX_DOMAINLEN);
if(dlen + origin_len - 1 > *len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
*len);
memmove(buf+dlen-1, origin, origin_len);
*len = dlen + origin_len - 1;
} else
*len = dlen;
return GLDNS_WIREPARSE_ERR_OK;
}
uint8_t* gldns_str2wire_dname(const char* str, size_t* len)
{
uint8_t dname[GLDNS_MAX_DOMAINLEN+1];
*len = sizeof(dname);
if(gldns_str2wire_dname_buf(str, dname, len) == 0) {
uint8_t* r;
if(*len > sizeof(dname)) return NULL;
r = (uint8_t*)malloc(*len);
if(r) return memcpy(r, dname, *len);
}
*len = 0;
return NULL;
}
/** read owner name */
static int
rrinternal_get_owner(gldns_buffer* strbuf, uint8_t* rr, size_t* len,
size_t* dname_len, uint8_t* origin, size_t origin_len, uint8_t* prev,
size_t prev_len, char* token, size_t token_len)
{
/* split the rr in its parts -1 signals trouble */
if(gldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX,
gldns_buffer_position(strbuf));
}
if(token_len < 2) /* make sure there is space to read "@" or "" */
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
if(token[0]=='@' && token[1]=='\0') {
uint8_t* tocopy;
if (origin) {
*dname_len = origin_len;
tocopy = origin;
} else if (prev) {
*dname_len = prev_len;
tocopy = prev;
} else {
/* default to root */
*dname_len = 1;
tocopy = (uint8_t*)"\0";
}
if(*len < *dname_len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
memmove(rr, tocopy, *dname_len);
} else if(*token == '\0') {
/* no ownername was given, try prev, if that fails
* origin, else default to root */
uint8_t* tocopy;
if(prev) {
*dname_len = prev_len;
tocopy = prev;
} else if(origin) {
*dname_len = origin_len;
tocopy = origin;
} else {
*dname_len = 1;
tocopy = (uint8_t*)"\0";
}
if(*len < *dname_len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
memmove(rr, tocopy, *dname_len);
} else {
size_t dlen = *len;
int s = gldns_str2wire_dname_buf_origin(token, rr, &dlen,
origin, origin_len);
if(s) return RET_ERR_SHIFT(s,
gldns_buffer_position(strbuf)-strlen(token));
*dname_len = dlen;
}
return GLDNS_WIREPARSE_ERR_OK;
}
/** read ttl */
static int
rrinternal_get_ttl(gldns_buffer* strbuf, char* token, size_t token_len,
int* not_there, uint32_t* ttl, uint32_t default_ttl)
{
const char* endptr;
int overflow;
if(gldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_TTL,
gldns_buffer_position(strbuf));
}
*ttl = (uint32_t) gldns_str2period(token, &endptr, &overflow);
if(overflow) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW,
gldns_buffer_position(strbuf));
}
if (strlen(token) > 0 && !isdigit((unsigned char)token[0])) {
*not_there = 1;
/* ah, it's not there or something */
if (default_ttl == 0) {
*ttl = GLDNS_DEFAULT_TTL;
} else {
*ttl = default_ttl;
}
}
return GLDNS_WIREPARSE_ERR_OK;
}
/** read class */
static int
rrinternal_get_class(gldns_buffer* strbuf, char* token, size_t token_len,
int* not_there, uint16_t* cl)
{
/* if 'not_there' then we got token from previous parse routine */
if(!*not_there) {
/* parse new token for class */
if(gldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_CLASS,
gldns_buffer_position(strbuf));
}
} else *not_there = 0;
*cl = gldns_get_rr_class_by_name(token);
/* class can be left out too, assume IN, current token must be type */
if(*cl == 0 && strcmp(token, "CLASS0") != 0) {
*not_there = 1;
*cl = GLDNS_RR_CLASS_IN;
}
return GLDNS_WIREPARSE_ERR_OK;
}
/** read type */
static int
rrinternal_get_type(gldns_buffer* strbuf, char* token, size_t token_len,
int* not_there, uint16_t* tp)
{
/* if 'not_there' then we got token from previous parse routine */
if(!*not_there) {
/* parse new token for type */
if(gldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_TYPE,
gldns_buffer_position(strbuf));
}
}
*tp = gldns_get_rr_type_by_name(token);
if(*tp == 0 && strcmp(token, "TYPE0") != 0) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_TYPE,
gldns_buffer_position(strbuf));
}
return GLDNS_WIREPARSE_ERR_OK;
}
/** put type, class, ttl into rr buffer */
static int
rrinternal_write_typeclassttl(gldns_buffer* strbuf, uint8_t* rr, size_t len,
size_t dname_len, uint16_t tp, uint16_t cl, uint32_t ttl, int question)
{
if(question) {
/* question is : name, type, class */
if(dname_len + 4 > len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
gldns_write_uint16(rr+dname_len, tp);
gldns_write_uint16(rr+dname_len+2, cl);
return GLDNS_WIREPARSE_ERR_OK;
}
/* type(2), class(2), ttl(4), rdatalen(2 (later)) = 10 */
if(dname_len + 10 > len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
gldns_write_uint16(rr+dname_len, tp);
gldns_write_uint16(rr+dname_len+2, cl);
gldns_write_uint32(rr+dname_len+4, ttl);
gldns_write_uint16(rr+dname_len+8, 0); /* rdatalen placeholder */
return GLDNS_WIREPARSE_ERR_OK;
}
/** find delimiters for type */
static const char*
rrinternal_get_delims(gldns_rdf_type rdftype, size_t r_cnt, size_t r_max)
{
switch(rdftype) {
case GLDNS_RDF_TYPE_B64 :
case GLDNS_RDF_TYPE_HEX : /* These rdf types may con- */
case GLDNS_RDF_TYPE_LOC : /* tain whitespace, only if */
case GLDNS_RDF_TYPE_WKS : /* it is the last rd field. */
case GLDNS_RDF_TYPE_IPSECKEY :
case GLDNS_RDF_TYPE_NSEC : if (r_cnt == r_max - 1) {
return "\n";
}
break;
default : break;
}
return "\n\t ";
}
/* Syntactic sugar for gldns_rr_new_frm_str_internal */
static int
gldns_rdf_type_maybe_quoted(gldns_rdf_type rdf_type)
{
return rdf_type == GLDNS_RDF_TYPE_STR ||
rdf_type == GLDNS_RDF_TYPE_LONG_STR;
}
/** see if rdata is quoted */
static int
rrinternal_get_quoted(gldns_buffer* strbuf, const char** delimiters,
gldns_rdf_type rdftype)
{
if(gldns_rdf_type_maybe_quoted(rdftype) &&
gldns_buffer_remaining(strbuf) > 0) {
/* skip spaces */
while(gldns_buffer_remaining(strbuf) > 0 &&
(*(gldns_buffer_current(strbuf)) == ' ' ||
*(gldns_buffer_current(strbuf)) == '\t')) {
gldns_buffer_skip(strbuf, 1);
}
if(gldns_buffer_remaining(strbuf) > 0 &&
*(gldns_buffer_current(strbuf)) == '\"') {
*delimiters = "\"\0";
gldns_buffer_skip(strbuf, 1);
return 1;
}
}
return 0;
}
/** spool hex data into rdata */
static int
rrinternal_spool_hex(char* token, uint8_t* rr, size_t rr_len,
size_t rr_cur_len, size_t* cur_hex_data_size, size_t hex_data_size)
{
char* p = token;
while(*p) {
if(isspace((unsigned char)*p)) {
p++;
continue;
}
if(!isxdigit((unsigned char)*p))
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_RDATA,
p-token);
if(*cur_hex_data_size >= hex_data_size)
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_RDATA,
p-token);
/* extra robust check */
if(rr_cur_len+(*cur_hex_data_size)/2 >= rr_len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
p-token);
/* see if 16s or 1s */
if( ((*cur_hex_data_size)&1) == 0) {
rr[rr_cur_len+(*cur_hex_data_size)/2] =
(uint8_t)gldns_hexdigit_to_int(*p)*16;
} else {
rr[rr_cur_len+(*cur_hex_data_size)/2] +=
(uint8_t)gldns_hexdigit_to_int(*p);
}
p++;
(*cur_hex_data_size)++;
}
return GLDNS_WIREPARSE_ERR_OK;
}
/** read unknown rr type format */
static int
rrinternal_parse_unknown(gldns_buffer* strbuf, char* token, size_t token_len,
uint8_t* rr, size_t* rr_len, size_t* rr_cur_len, size_t pre_data_pos)
{
const char* delim = "\n\t ";
size_t hex_data_size, cur_hex_data_size;
/* go back to before \#
* and skip it while setting delimiters better
*/
gldns_buffer_set_position(strbuf, pre_data_pos);
if(gldns_bget_token(strbuf, token, delim, token_len) == -1)
return GLDNS_WIREPARSE_ERR_GENERAL; /* should not fail */
/* read rdata octet length */
if(gldns_bget_token(strbuf, token, delim, token_len) == -1) {
/* something goes very wrong here */
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_RDATA,
gldns_buffer_position(strbuf));
}
hex_data_size = (size_t)atoi(token);
if(hex_data_size > GLDNS_MAX_RDFLEN ||
*rr_cur_len + hex_data_size > *rr_len) {
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
}
/* copy hex chars into hex str (2 chars per byte) */
hex_data_size *= 2;
cur_hex_data_size = 0;
while(cur_hex_data_size < hex_data_size) {
int status;
ssize_t c = gldns_bget_token(strbuf, token, delim, token_len);
if((status = rrinternal_spool_hex(token, rr, *rr_len,
*rr_cur_len, &cur_hex_data_size, hex_data_size)) != 0)
return RET_ERR_SHIFT(status,
gldns_buffer_position(strbuf)-strlen(token));
if(c == -1) {
if(cur_hex_data_size != hex_data_size)
return RET_ERR(
GLDNS_WIREPARSE_ERR_SYNTAX_RDATA,
gldns_buffer_position(strbuf));
break;
}
}
*rr_cur_len += hex_data_size/2;
return GLDNS_WIREPARSE_ERR_OK;
}
/** parse normal RR rdata element */
static int
rrinternal_parse_rdf(gldns_buffer* strbuf, char* token, size_t token_len,
uint8_t* rr, size_t rr_len, size_t* rr_cur_len, gldns_rdf_type rdftype,
uint16_t rr_type, size_t r_cnt, size_t r_max, size_t dname_len,
uint8_t* origin, size_t origin_len)
{
size_t len;
int status;
switch(rdftype) {
case GLDNS_RDF_TYPE_DNAME:
/* check if the origin should be used or concatenated */
if(strcmp(token, "@") == 0) {
uint8_t* tocopy;
size_t copylen;
if(origin) {
copylen = origin_len;
tocopy = origin;
} else if(rr_type == GLDNS_RR_TYPE_SOA) {
copylen = dname_len;
tocopy = rr; /* copy rr owner name */
} else {
copylen = 1;
tocopy = (uint8_t*)"\0";
}
if((*rr_cur_len) + copylen > rr_len)
return RET_ERR(
GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
memmove(rr+*rr_cur_len, tocopy, copylen);
(*rr_cur_len) += copylen;
} else {
size_t dlen = rr_len - (*rr_cur_len);
int s = gldns_str2wire_dname_buf_origin(token,
rr+*rr_cur_len, &dlen, origin, origin_len);
if(s) return RET_ERR_SHIFT(s,
gldns_buffer_position(strbuf)-strlen(token));
(*rr_cur_len) += dlen;
}
return GLDNS_WIREPARSE_ERR_OK;
case GLDNS_RDF_TYPE_HEX:
case GLDNS_RDF_TYPE_B64:
/* When this is the last rdata field, then the
* rest should be read in (cause then these
* rdf types may contain spaces). */
if(r_cnt == r_max - 1) {
size_t tlen = strlen(token);
(void)gldns_bget_token(strbuf, token+tlen, "\n",
token_len - tlen);
}
break;
default:
break;
}
len = rr_len - (*rr_cur_len);
if((status=gldns_str2wire_rdf_buf(token, rr+(*rr_cur_len), &len,
rdftype)) != 0)
return RET_ERR_SHIFT(status,
gldns_buffer_position(strbuf)-strlen(token));
*rr_cur_len += len;
return GLDNS_WIREPARSE_ERR_OK;
}
/**
* Parse one rdf token. Takes care of quotes and parenthesis.
*/
static int
gldns_parse_rdf_token(gldns_buffer* strbuf, char* token, size_t token_len,
int* quoted, int* parens, size_t* pre_data_pos,
const char* delimiters, gldns_rdf_type rdftype, size_t* token_strlen)
{
size_t slen;
/* skip spaces and tabs */
while(gldns_buffer_remaining(strbuf) > 0 && !*quoted &&
(*(gldns_buffer_current(strbuf)) == ' ' ||
*(gldns_buffer_current(strbuf)) == '\t')) {
gldns_buffer_skip(strbuf, 1);
}
*pre_data_pos = gldns_buffer_position(strbuf);
if(gldns_bget_token_par(strbuf, token, (*quoted)?"\"":delimiters,
token_len, parens, (*quoted)?NULL:" \t") == -1) {
return 0;
}
slen = strlen(token);
/* check if not quoted yet, and we have encountered quotes */
if(!*quoted && gldns_rdf_type_maybe_quoted(rdftype) &&
slen >= 2 &&
(token[0] == '"' || token[0] == '\'') &&
(token[slen-1] == '"' || token[slen-1] == '\'')) {
/* move token two smaller (quotes) with endnull */
memmove(token, token+1, slen-2);
token[slen-2] = 0;
slen -= 2;
*quoted = 1;
} else if(!*quoted && gldns_rdf_type_maybe_quoted(rdftype) &&
slen >= 2 &&
(token[0] == '"' || token[0] == '\'')) {
/* got the start quote (remove it) but read remainder
* of quoted string as well into remainder of token */
memmove(token, token+1, slen-1);
token[slen-1] = 0;
slen -= 1;
*quoted = 1;
/* rewind buffer over skipped whitespace */
while(gldns_buffer_position(strbuf) > 0 &&
(gldns_buffer_current(strbuf)[-1] == ' ' ||
gldns_buffer_current(strbuf)[-1] == '\t')) {
gldns_buffer_skip(strbuf, -1);
}
if(gldns_bget_token_par(strbuf, token+slen,
"\"", token_len-slen,
parens, NULL) == -1) {
return 0;
}
slen = strlen(token);
}
*token_strlen = slen;
return 1;
}
/** Add space and one more rdf token onto the existing token string. */
static int
gldns_affix_token(gldns_buffer* strbuf, char* token, size_t* token_len,
int* quoted, int* parens, size_t* pre_data_pos,
const char* delimiters, gldns_rdf_type rdftype, size_t* token_strlen)
{
size_t addlen = *token_len - *token_strlen;
size_t addstrlen = 0;
/* add space */
/* when addlen < 2, the token buffer is full considering the NULL byte
* from strlen and will lead to buffer overflow with the second
* assignment below. */
if(addlen < 2) return 0;
token[*token_strlen] = ' ';
token[++(*token_strlen)] = 0;
/* read another token */
addlen = *token_len - *token_strlen;
if(!gldns_parse_rdf_token(strbuf, token+*token_strlen, addlen, quoted,
parens, pre_data_pos, delimiters, rdftype, &addstrlen))
return 0;
(*token_strlen) += addstrlen;
return 1;
}
static int gldns_str2wire_svcparam_key_cmp(const void *a, const void *b)
{
return gldns_read_uint16(*(uint8_t**) a)
- gldns_read_uint16(*(uint8_t**) b);
}
/**
* Add constraints to the SVCB RRs which involve the whole set
*/
static int gldns_str2wire_check_svcbparams(uint8_t* rdata, uint16_t rdata_len)
{
size_t nparams = 0, i;
uint8_t new_rdata[GLDNS_MAX_RDFLEN];
uint8_t* new_rdata_ptr = new_rdata;
uint8_t* svcparams[MAX_NUMBER_OF_SVCPARAMS];
uint8_t* rdata_ptr = rdata;
uint16_t rdata_remaining = rdata_len;
/* find the SvcParams */
while (rdata_remaining) {
uint16_t svcbparam_len;
svcparams[nparams] = rdata_ptr;
if (rdata_remaining < 4)
return GLDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA;
svcbparam_len = gldns_read_uint16(rdata_ptr + 2);
rdata_remaining -= 4;
rdata_ptr += 4;
if (rdata_remaining < svcbparam_len)
return GLDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA;
rdata_remaining -= svcbparam_len;
rdata_ptr += svcbparam_len;
nparams += 1;
if (nparams >= MAX_NUMBER_OF_SVCPARAMS)
return GLDNS_WIREPARSE_ERR_SVCB_TOO_MANY_PARAMS;
}
/* In draft-ietf-dnsop-svcb-https-06 Section 7:
*
* In wire format, the keys are represented by their numeric
* values in network byte order, concatenated in ascending order.
*/
qsort((void *)svcparams
,nparams
,sizeof(uint8_t*)
,gldns_str2wire_svcparam_key_cmp);
/* The code below revolves around semantic errors in the SVCParam set.
* So long as we do not distinguish between running Unbound as a primary
* or as a secondary, we default to secondary behavior and we ignore the
* semantic errors. */
#ifdef SVCB_SEMANTIC_ERRORS
{
uint8_t* mandatory = NULL;
/* In draft-ietf-dnsop-svcb-https-06 Section 7:
*
* Keys (...) MUST NOT appear more than once.
*
* If they key has already been seen, we have a duplicate
*/
for(i=0; i < nparams; i++) {
uint16_t key = gldns_read_uint16(svcparams[i]);
if(i + 1 < nparams && key == gldns_read_uint16(svcparams[i+1]))
return GLDNS_WIREPARSE_ERR_SVCB_DUPLICATE_KEYS;
if(key == SVCB_KEY_MANDATORY)
mandatory = svcparams[i];
}
/* 4. verify that all the SvcParamKeys in mandatory are present */
if(mandatory) {
/* Divide by sizeof(uint16_t)*/
uint16_t mandatory_nkeys = gldns_read_uint16(mandatory + 2) / sizeof(uint16_t);
/* Guaranteed by gldns_str2wire_svcparam_key_value */
assert(mandatory_nkeys > 0);
for(i=0; i < mandatory_nkeys; i++) {
uint16_t mandatory_key = gldns_read_uint16(
mandatory
+ 2 * sizeof(uint16_t)
+ i * sizeof(uint16_t));
uint8_t found = 0;
size_t j;
for(j=0; j < nparams; j++) {
if(mandatory_key == gldns_read_uint16(svcparams[j])) {
found = 1;
break;
}
}
if(!found)
return GLDNS_WIREPARSE_ERR_SVCB_MANDATORY_MISSING_PARAM;
}
}
}
#endif
/* Write rdata in correct order */
for (i = 0; i < nparams; i++) {
uint16_t svcparam_len = gldns_read_uint16(svcparams[i] + 2)
+ 2 * sizeof(uint16_t);
if ((unsigned)(new_rdata_ptr - new_rdata) + svcparam_len > sizeof(new_rdata))
return GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
memcpy(new_rdata_ptr, svcparams[i], svcparam_len);
new_rdata_ptr += svcparam_len;
}
memcpy(rdata, new_rdata, rdata_len);
return GLDNS_WIREPARSE_ERR_OK;
}
/** parse rdata from string into rr buffer(-remainder after dname). */
static int
rrinternal_parse_rdata(gldns_buffer* strbuf, char* token, size_t token_len,
uint8_t* rr, size_t* rr_len, size_t dname_len, uint16_t rr_type,
uint8_t* origin, size_t origin_len)
{
const gldns_rr_descriptor *desc = gldns_rr_descript((uint16_t)rr_type);
size_t r_cnt, r_min, r_max;
size_t rr_cur_len = dname_len + 10, pre_data_pos, token_strlen;
int was_unknown_rr_format = 0, parens = 0, status, quoted;
const char* delimiters;
gldns_rdf_type rdftype;
/* a desc is always returned */
if(!desc) return GLDNS_WIREPARSE_ERR_GENERAL;
r_max = gldns_rr_descriptor_maximum(desc);
r_min = gldns_rr_descriptor_minimum(desc);
/* robust check */
if(rr_cur_len > *rr_len)
return RET_ERR(GLDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
gldns_buffer_position(strbuf));
/* because number of fields can be variable, we can't rely on
* _maximum() only */
for(r_cnt=0; r_cnt < r_max; r_cnt++) {
rdftype = gldns_rr_descriptor_field_type(desc, r_cnt);
delimiters = rrinternal_get_delims(rdftype, r_cnt, r_max);
quoted = rrinternal_get_quoted(strbuf, &delimiters, rdftype);
if(!gldns_parse_rdf_token(strbuf, token, token_len, "ed,
&parens, &pre_data_pos, delimiters, rdftype,
&token_strlen))
break;
/* rfc3597 specifies that any type can be represented
* with \# method, which can contain spaces...
* it does specify size though... */
/* unknown RR data */
if(token_strlen>=2 && strncmp(token, "\\#", 2) == 0 &&
!quoted && (token_strlen == 2 || token[2]==' ' ||
token[2]=='\t')) {
was_unknown_rr_format = 1;
if((status=rrinternal_parse_unknown(strbuf, token,
token_len, rr, rr_len, &rr_cur_len,
pre_data_pos)) != 0)
return status;
} else if(token_strlen > 0 || quoted) {
if(rdftype == GLDNS_RDF_TYPE_HIP) {
/* affix the HIT and PK fields, with a space */
if(!gldns_affix_token(strbuf, token,
&token_len, "ed, &parens,
&pre_data_pos, delimiters,
rdftype, &token_strlen))
break;
if(!gldns_affix_token(strbuf, token,
&token_len, "ed, &parens,
&pre_data_pos, delimiters,
rdftype, &token_strlen))
break;
} else if(rdftype == GLDNS_RDF_TYPE_INT16_DATA &&
strcmp(token, "0")!=0) {
/* affix len and b64 fields */
if(!gldns_affix_token(strbuf, token,
&token_len, "ed, &parens,
&pre_data_pos, delimiters,
rdftype, &token_strlen))
break;
}
/* normal RR */
if((status=rrinternal_parse_rdf(strbuf, token,
token_len, rr, *rr_len, &rr_cur_len, rdftype,
rr_type, r_cnt, r_max, dname_len, origin,
origin_len)) != 0) {
return status;
}
}
}
if(!was_unknown_rr_format && r_cnt+1 < r_min) {
return RET_ERR(GLDNS_WIREPARSE_ERR_SYNTAX_MISSING_VALUE,
gldns_buffer_position(strbuf));
}
while(parens != 0) {
/* read remainder, must be "" */
if(gldns_bget_token_par(strbuf, token, "\n", token_len,
&parens, " \t") == -1) {
if(parens != 0)
return RET_ERR(GLDNS_WIREPARSE_ERR_PARENTHESIS,
gldns_buffer_position(strbuf));
break;
}
if(strcmp(token, "") != 0)
return RET_ERR(GLDNS_WIREPARSE_ERR_PARENTHESIS,
gldns_buffer_position(strbuf));
}
/* write rdata length */
gldns_write_uint16(rr+dname_len+8, (uint16_t)(rr_cur_len-dname_len-10));
*rr_len = rr_cur_len;
/* SVCB/HTTPS handling */
if (rr_type == GLDNS_RR_TYPE_SVCB || rr_type == GLDNS_RR_TYPE_HTTPS) {
size_t rdata_len = rr_cur_len - dname_len - 10;
uint8_t *rdata = rr+dname_len + 10;
/* skip 1st rdata field SvcPriority (uint16_t) */
if (rdata_len < sizeof(uint16_t))
return GLDNS_WIREPARSE_ERR_OK;
rdata_len -= sizeof(uint16_t);
rdata += sizeof(uint16_t);
/* skip 2nd rdata field dname */
while (rdata_len && *rdata != 0) {
uint8_t label_len;
if (*rdata & 0xC0)
return GLDNS_WIREPARSE_ERR_OK;
label_len = *rdata + 1;
if (rdata_len < label_len)
return GLDNS_WIREPARSE_ERR_OK;
rdata_len -= label_len;
rdata += label_len;
}
/* The root label is one more character, so smaller
* than 1 + 1 means no Svcparam Keys */
if (rdata_len < 2 || *rdata != 0)
return GLDNS_WIREPARSE_ERR_OK;
rdata_len -= 1;
rdata += 1;
return gldns_str2wire_check_svcbparams(rdata, rdata_len);
}
return GLDNS_WIREPARSE_ERR_OK;
}
/*
* trailing spaces are allowed
* leading spaces are not allowed
* allow ttl to be optional
* class is optional too
* if ttl is missing, and default_ttl is 0, use DEF_TTL
* allow ttl to be written as 1d3h
* So the RR should look like. e.g.
* miek.nl. 3600 IN MX 10 elektron.atoom.net
* or
* miek.nl. 1h IN MX 10 elektron.atoom.net
* or
* miek.nl. IN MX 10 elektron.atoom.net
*/
static int
gldns_str2wire_rr_buf_internal(const char* str, uint8_t* rr, size_t* len,
size_t* dname_len, uint32_t default_ttl, uint8_t* origin,
size_t origin_len, uint8_t* prev, size_t prev_len, int question)
{
int status;
int not_there = 0;
char token[GLDNS_MAX_RDFLEN+1];
uint32_t ttl = 0;
uint16_t tp = 0, cl = 0;
size_t ddlen = 0;
/* string in buffer */
gldns_buffer strbuf;
gldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
if(!dname_len) dname_len = &ddlen;
/* parse the owner */
if((status=rrinternal_get_owner(&strbuf, rr, len, dname_len, origin,
origin_len, prev, prev_len, token, sizeof(token))) != 0)
return status;
/* parse the [ttl] [class] <type> */
if((status=rrinternal_get_ttl(&strbuf, token, sizeof(token),
¬_there, &ttl, default_ttl)) != 0)
return status;
if((status=rrinternal_get_class(&strbuf, token, sizeof(token),
¬_there, &cl)) != 0)
return status;
if((status=rrinternal_get_type(&strbuf, token, sizeof(token),
¬_there, &tp)) != 0)
return status;
/* put ttl, class, type into the rr result */
if((status=rrinternal_write_typeclassttl(&strbuf, rr, *len, *dname_len, tp, cl,
ttl, question)) != 0)
return status;
/* for a question-RR we are done, no rdata */
if(question) {
*len = *dname_len + 4;
return GLDNS_WIREPARSE_ERR_OK;
}
/* rdata */
if((status=rrinternal_parse_rdata(&strbuf, token, sizeof(token),
rr, len, *dname_len, tp, origin, origin_len)) != 0)
return status;
return GLDNS_WIREPARSE_ERR_OK;
}
int gldns_str2wire_rr_buf(const char* str, uint8_t* rr, size_t* len,
size_t* dname_len, uint32_t default_ttl, uint8_t* origin,
size_t origin_len, uint8_t* prev, size_t prev_len)
{
return gldns_str2wire_rr_buf_internal(str, rr, len, dname_len,
default_ttl, origin, origin_len, prev, prev_len, 0);
}
int gldns_str2wire_rr_question_buf(const char* str, uint8_t* rr, size_t* len,
size_t* dname_len, uint8_t* origin, size_t origin_len, uint8_t* prev,
size_t prev_len)
{
return gldns_str2wire_rr_buf_internal(str, rr, len, dname_len,
0, origin, origin_len, prev, prev_len, 1);
}
uint16_t gldns_wirerr_get_type(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+2)
return 0;
return gldns_read_uint16(rr+dname_len);
}
uint16_t gldns_wirerr_get_class(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+4)
return 0;
return gldns_read_uint16(rr+dname_len+2);
}
uint32_t gldns_wirerr_get_ttl(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+8)
return 0;
return gldns_read_uint32(rr+dname_len+4);
}
uint16_t gldns_wirerr_get_rdatalen(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+10)
return 0;
return gldns_read_uint16(rr+dname_len+8);
}
uint8_t* gldns_wirerr_get_rdata(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+10)
return NULL;
return rr+dname_len+10;
}
uint8_t* gldns_wirerr_get_rdatawl(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+10)