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rr.c
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/* rr.c
*
* access functions for ldns_rr -
* a Net::DNS like library for C
* LibDNS Team @ NLnet Labs
*
* (c) NLnet Labs, 2004-2006
* See the file LICENSE for the license
*/
#include <ldns/config.h>
#include <ldns/ldns.h>
#include <strings.h>
#include <limits.h>
#include <errno.h>
#define LDNS_SYNTAX_DATALEN 16
#define LDNS_TTL_DATALEN 21
#define LDNS_RRLIST_INIT 8
ldns_rr *
ldns_rr_new(void)
{
ldns_rr *rr;
rr = LDNS_MALLOC(ldns_rr);
if (!rr) {
return NULL;
}
ldns_rr_set_owner(rr, NULL);
ldns_rr_set_question(rr, false);
ldns_rr_set_rd_count(rr, 0);
rr->_rdata_fields = NULL;
ldns_rr_set_class(rr, LDNS_RR_CLASS_IN);
ldns_rr_set_ttl(rr, LDNS_DEFAULT_TTL);
return rr;
}
ldns_rr *
ldns_rr_new_frm_type(ldns_rr_type t)
{
ldns_rr *rr;
const ldns_rr_descriptor *desc;
size_t i;
rr = LDNS_MALLOC(ldns_rr);
if (!rr) {
return NULL;
}
desc = ldns_rr_descript(t);
rr->_rdata_fields = LDNS_XMALLOC(ldns_rdf *, ldns_rr_descriptor_minimum(desc));
if(!rr->_rdata_fields) {
LDNS_FREE(rr);
return NULL;
}
for (i = 0; i < ldns_rr_descriptor_minimum(desc); i++) {
rr->_rdata_fields[i] = NULL;
}
ldns_rr_set_owner(rr, NULL);
ldns_rr_set_question(rr, false);
/* set the count to minimum */
ldns_rr_set_rd_count(rr, ldns_rr_descriptor_minimum(desc));
ldns_rr_set_class(rr, LDNS_RR_CLASS_IN);
ldns_rr_set_ttl(rr, LDNS_DEFAULT_TTL);
ldns_rr_set_type(rr, t);
return rr;
}
void
ldns_rr_free(ldns_rr *rr)
{
size_t i;
if (rr) {
if (ldns_rr_owner(rr)) {
ldns_rdf_deep_free(ldns_rr_owner(rr));
}
for (i = 0; i < ldns_rr_rd_count(rr); i++) {
ldns_rdf_deep_free(ldns_rr_rdf(rr, i));
}
LDNS_FREE(rr->_rdata_fields);
LDNS_FREE(rr);
}
}
/* Syntactic sugar for ldns_rr_new_frm_str_internal */
INLINE bool
ldns_rdf_type_maybe_quoted(ldns_rdf_type rdf_type)
{
return rdf_type == LDNS_RDF_TYPE_STR ||
rdf_type == LDNS_RDF_TYPE_LONG_STR;
}
/*
* 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 ldns_status
ldns_rr_new_frm_str_internal(ldns_rr **newrr, const char *str,
uint32_t default_ttl, const ldns_rdf *origin,
ldns_rdf **prev, bool question)
{
ldns_rr *new;
const ldns_rr_descriptor *desc;
ldns_rr_type rr_type;
ldns_buffer *rr_buf = NULL;
ldns_buffer *rd_buf = NULL;
uint32_t ttl_val;
char *owner = NULL;
char *ttl = NULL;
ldns_rr_class clas_val;
char *clas = NULL;
char *type = NULL;
char *rdata = NULL;
char *rd = NULL;
char *xtok = NULL; /* For RDF types with spaces (i.e. extra tokens) */
size_t rd_strlen;
const char *delimiters;
ssize_t c;
ldns_rdf *owner_dname;
const char* endptr;
int was_unknown_rr_format = 0;
ldns_status status = LDNS_STATUS_OK;
/* used for types with unknown number of rdatas */
bool done;
bool quoted;
ldns_rdf *r = NULL;
uint16_t r_cnt;
uint16_t r_min;
uint16_t r_max;
size_t pre_data_pos;
uint16_t hex_data_size;
char *hex_data_str = NULL;
uint16_t cur_hex_data_size;
size_t hex_pos = 0;
uint8_t *hex_data = NULL;
new = ldns_rr_new();
owner = LDNS_XMALLOC(char, LDNS_MAX_DOMAINLEN + 1);
ttl = LDNS_XMALLOC(char, LDNS_TTL_DATALEN);
clas = LDNS_XMALLOC(char, LDNS_SYNTAX_DATALEN);
rdata = LDNS_XMALLOC(char, LDNS_MAX_PACKETLEN + 1);
rr_buf = LDNS_MALLOC(ldns_buffer);
rd_buf = LDNS_MALLOC(ldns_buffer);
rd = LDNS_XMALLOC(char, LDNS_MAX_RDFLEN);
xtok = LDNS_XMALLOC(char, LDNS_MAX_RDFLEN);
if (rr_buf) {
rr_buf->_data = NULL;
}
if (rd_buf) {
rd_buf->_data = NULL;
}
if (!new || !owner || !ttl || !clas || !rdata ||
!rr_buf || !rd_buf || !rd || !xtok) {
goto memerror;
}
ldns_buffer_new_frm_data(rr_buf, (char*)str, strlen(str));
/* split the rr in its parts -1 signals trouble */
if (ldns_bget_token(rr_buf, owner, "\t\n ", LDNS_MAX_DOMAINLEN) == -1){
status = LDNS_STATUS_SYNTAX_ERR;
goto error;
}
if (ldns_bget_token(rr_buf, ttl, "\t\n ", LDNS_TTL_DATALEN) == -1) {
status = LDNS_STATUS_SYNTAX_TTL_ERR;
goto error;
}
ttl_val = (uint32_t) ldns_str2period(ttl, &endptr);
if (strlen(ttl) > 0 && !isdigit((int) ttl[0])) {
/* ah, it's not there or something */
if (default_ttl == 0) {
ttl_val = LDNS_DEFAULT_TTL;
} else {
ttl_val = default_ttl;
}
/* we not ASSUMING the TTL is missing and that
* the rest of the RR is still there. That is
* CLASS TYPE RDATA
* so ttl value we read is actually the class
*/
clas_val = ldns_get_rr_class_by_name(ttl);
/* class can be left out too, assume IN, current
* token must be type
*/
if (clas_val == 0) {
clas_val = LDNS_RR_CLASS_IN;
type = LDNS_XMALLOC(char, strlen(ttl) + 1);
if (!type) {
goto memerror;
}
strncpy(type, ttl, strlen(ttl) + 1);
}
} else {
if (-1 == ldns_bget_token(
rr_buf, clas, "\t\n ", LDNS_SYNTAX_DATALEN)) {
status = LDNS_STATUS_SYNTAX_CLASS_ERR;
goto error;
}
clas_val = ldns_get_rr_class_by_name(clas);
/* class can be left out too, assume IN, current
* token must be type
*/
if (clas_val == 0) {
clas_val = LDNS_RR_CLASS_IN;
type = LDNS_XMALLOC(char, strlen(clas) + 1);
if (!type) {
goto memerror;
}
strncpy(type, clas, strlen(clas) + 1);
}
}
/* the rest should still be waiting for us */
if (!type) {
type = LDNS_XMALLOC(char, LDNS_SYNTAX_DATALEN);
if (!type) {
goto memerror;
}
if (-1 == ldns_bget_token(
rr_buf, type, "\t\n ", LDNS_SYNTAX_DATALEN)) {
status = LDNS_STATUS_SYNTAX_TYPE_ERR;
goto error;
}
}
if (ldns_bget_token(rr_buf, rdata, "\0", LDNS_MAX_PACKETLEN) == -1) {
/* apparently we are done, and it's only a question RR
* so do not set status and go to ldnserror here
*/
}
ldns_buffer_new_frm_data(rd_buf, rdata, strlen(rdata));
if (strlen(owner) <= 1 && strncmp(owner, "@", 1) == 0) {
if (origin) {
ldns_rr_set_owner(new, ldns_rdf_clone(origin));
} else if (prev && *prev) {
ldns_rr_set_owner(new, ldns_rdf_clone(*prev));
} else {
/* default to root */
ldns_rr_set_owner(new, ldns_dname_new_frm_str("."));
}
/* @ also overrides prev */
if (prev) {
ldns_rdf_deep_free(*prev);
*prev = ldns_rdf_clone(ldns_rr_owner(new));
if (!*prev) {
goto memerror;
}
}
} else {
if (strlen(owner) == 0) {
/* no ownername was given, try prev, if that fails
* origin, else default to root */
if (prev && *prev) {
ldns_rr_set_owner(new, ldns_rdf_clone(*prev));
} else if (origin) {
ldns_rr_set_owner(new, ldns_rdf_clone(origin));
} else {
ldns_rr_set_owner(new,
ldns_dname_new_frm_str("."));
}
if(!ldns_rr_owner(new)) {
goto memerror;
}
} else {
owner_dname = ldns_dname_new_frm_str(owner);
if (!owner_dname) {
status = LDNS_STATUS_SYNTAX_ERR;
goto error;
}
ldns_rr_set_owner(new, owner_dname);
if (!ldns_dname_str_absolute(owner) && origin) {
if(ldns_dname_cat(ldns_rr_owner(new), origin)
!= LDNS_STATUS_OK) {
status = LDNS_STATUS_SYNTAX_ERR;
goto error;
}
}
if (prev) {
ldns_rdf_deep_free(*prev);
*prev = ldns_rdf_clone(ldns_rr_owner(new));
if (!*prev) {
goto error;
}
}
}
}
LDNS_FREE(owner);
ldns_rr_set_question(new, question);
ldns_rr_set_ttl(new, ttl_val);
LDNS_FREE(ttl);
ldns_rr_set_class(new, clas_val);
LDNS_FREE(clas);
rr_type = ldns_get_rr_type_by_name(type);
LDNS_FREE(type);
desc = ldns_rr_descript((uint16_t)rr_type);
ldns_rr_set_type(new, rr_type);
if (desc) {
/* only the rdata remains */
r_max = ldns_rr_descriptor_maximum(desc);
r_min = ldns_rr_descriptor_minimum(desc);
} else {
r_min = 0;
r_max = 1;
}
for (done = false, r_cnt = 0; !done && r_cnt < r_max; r_cnt++) {
quoted = false;
switch (ldns_rr_descriptor_field_type(desc, r_cnt)) {
case LDNS_RDF_TYPE_B64 :
case LDNS_RDF_TYPE_HEX : /* These rdf types may con- */
case LDNS_RDF_TYPE_LOC : /* tain whitespace, only if */
case LDNS_RDF_TYPE_WKS : /* it is the last rd field. */
case LDNS_RDF_TYPE_IPSECKEY :
case LDNS_RDF_TYPE_NSEC : if (r_cnt == r_max - 1) {
delimiters = "\n";
break;
}
default : delimiters = "\n\t ";
}
if (ldns_rdf_type_maybe_quoted(
ldns_rr_descriptor_field_type(
desc, r_cnt)) &&
ldns_buffer_remaining(rd_buf) > 0){
/* skip spaces */
while (*(ldns_buffer_current(rd_buf)) == ' ') {
ldns_buffer_skip(rd_buf, 1);
}
if (*(ldns_buffer_current(rd_buf)) == '\"') {
delimiters = "\"\0";
ldns_buffer_skip(rd_buf, 1);
quoted = true;
} else if (ldns_rr_descriptor_field_type(desc, r_cnt)
== LDNS_RDF_TYPE_LONG_STR) {
status = LDNS_STATUS_SYNTAX_RDATA_ERR;
goto error;
}
}
/* because number of fields can be variable, we can't rely on
* _maximum() only
*/
/* skip spaces */
while (ldns_buffer_position(rd_buf) < ldns_buffer_limit(rd_buf)
&& *(ldns_buffer_current(rd_buf)) == ' '
&& !quoted) {
ldns_buffer_skip(rd_buf, 1);
}
pre_data_pos = ldns_buffer_position(rd_buf);
if (-1 == (c = ldns_bget_token(
rd_buf, rd, delimiters, LDNS_MAX_RDFLEN))) {
done = true;
break;
}
/* hmmz, rfc3597 specifies that any type can be represented
* with \# method, which can contain spaces...
* it does specify size though...
*/
rd_strlen = strlen(rd);
/* unknown RR data */
if (strncmp(rd, "\\#", 2) == 0 && !quoted &&
(rd_strlen == 2 || rd[2]==' ')) {
was_unknown_rr_format = 1;
/* go back to before \#
* and skip it while setting delimiters better
*/
ldns_buffer_set_position(rd_buf, pre_data_pos);
delimiters = "\n\t ";
(void)ldns_bget_token(rd_buf, rd,
delimiters, LDNS_MAX_RDFLEN);
/* read rdata octet length */
c = ldns_bget_token(rd_buf, rd,
delimiters, LDNS_MAX_RDFLEN);
if (c == -1) {
/* something goes very wrong here */
status = LDNS_STATUS_SYNTAX_RDATA_ERR;
goto error;
}
hex_data_size = (uint16_t) atoi(rd);
/* copy hex chars into hex str (2 chars per byte) */
hex_data_str = LDNS_XMALLOC(char, 2*hex_data_size + 1);
if (!hex_data_str) {
/* malloc error */
goto memerror;
}
cur_hex_data_size = 0;
while(cur_hex_data_size < 2 * hex_data_size) {
c = ldns_bget_token(rd_buf, rd,
delimiters, LDNS_MAX_RDFLEN);
if (c != -1) {
rd_strlen = strlen(rd);
}
if (c == -1 ||
(size_t)cur_hex_data_size + rd_strlen >
2 * (size_t)hex_data_size) {
status = LDNS_STATUS_SYNTAX_RDATA_ERR;
goto error;
}
strncpy(hex_data_str + cur_hex_data_size, rd,
rd_strlen);
cur_hex_data_size += rd_strlen;
}
hex_data_str[cur_hex_data_size] = '\0';
/* correct the rdf type */
/* if *we* know the type, interpret it as wireformat */
if (desc) {
hex_pos = 0;
hex_data =
LDNS_XMALLOC(uint8_t, hex_data_size+2);
if (!hex_data) {
goto memerror;
}
ldns_write_uint16(hex_data, hex_data_size);
ldns_hexstring_to_data(
hex_data + 2, hex_data_str);
status = ldns_wire2rdf(new, hex_data,
hex_data_size + 2, &hex_pos);
if (status != LDNS_STATUS_OK) {
goto error;
}
LDNS_FREE(hex_data);
} else {
r = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_HEX,
hex_data_str);
if (!r) {
goto memerror;
}
ldns_rdf_set_type(r, LDNS_RDF_TYPE_UNKNOWN);
if (!ldns_rr_push_rdf(new, r)) {
goto memerror;
}
}
LDNS_FREE(hex_data_str);
} else if(rd_strlen > 0 || quoted) {
/* Normal RR */
switch(ldns_rr_descriptor_field_type(desc, r_cnt)) {
case LDNS_RDF_TYPE_HEX:
case LDNS_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) {
c = ldns_bget_token(rd_buf, xtok,
"\n", LDNS_MAX_RDFLEN);
if (c != -1) {
(void) strncat(rd, xtok,
LDNS_MAX_RDFLEN -
strlen(rd) - 1);
}
}
r = ldns_rdf_new_frm_str(
ldns_rr_descriptor_field_type(
desc, r_cnt), rd);
break;
case LDNS_RDF_TYPE_HIP:
/*
* In presentation format this RDATA type has
* three tokens: An algorithm byte, then a
* variable length HIT (in hexbytes) and then
* a variable length Public Key (in base64).
*
* We have just read the algorithm, so we need
* two more tokens: HIT and Public Key.
*/
do {
/* Read and append HIT */
if (ldns_bget_token(rd_buf,
xtok, delimiters,
LDNS_MAX_RDFLEN) == -1)
break;
(void) strncat(rd, " ",
LDNS_MAX_RDFLEN -
strlen(rd) - 1);
(void) strncat(rd, xtok,
LDNS_MAX_RDFLEN -
strlen(rd) - 1);
/* Read and append Public Key*/
if (ldns_bget_token(rd_buf,
xtok, delimiters,
LDNS_MAX_RDFLEN) == -1)
break;
(void) strncat(rd, " ",
LDNS_MAX_RDFLEN -
strlen(rd) - 1);
(void) strncat(rd, xtok,
LDNS_MAX_RDFLEN -
strlen(rd) - 1);
} while (false);
r = ldns_rdf_new_frm_str(
ldns_rr_descriptor_field_type(
desc, r_cnt), rd);
break;
case LDNS_RDF_TYPE_DNAME:
r = ldns_rdf_new_frm_str(
ldns_rr_descriptor_field_type(
desc, r_cnt), rd);
/* check if the origin should be used
* or concatenated
*/
if (r && ldns_rdf_size(r) > 1 &&
ldns_rdf_data(r)[0] == 1 &&
ldns_rdf_data(r)[1] == '@') {
ldns_rdf_deep_free(r);
r = origin ? ldns_rdf_clone(origin)
: ( rr_type == LDNS_RR_TYPE_SOA ?
ldns_rdf_clone(
ldns_rr_owner(new))
: ldns_rdf_new_frm_str(
LDNS_RDF_TYPE_DNAME, ".")
);
} else if (r && rd_strlen >= 1 && origin &&
!ldns_dname_str_absolute(rd)) {
status = ldns_dname_cat(r, origin);
if (status != LDNS_STATUS_OK) {
goto error;
}
}
break;
default:
r = ldns_rdf_new_frm_str(
ldns_rr_descriptor_field_type(
desc, r_cnt), rd);
break;
}
if (!r) {
status = LDNS_STATUS_SYNTAX_RDATA_ERR;
goto error;
}
ldns_rr_push_rdf(new, r);
}
if (quoted) {
if (ldns_buffer_available(rd_buf, 1)) {
ldns_buffer_skip(rd_buf, 1);
} else {
done = true;
}
}
} /* for (done = false, r_cnt = 0; !done && r_cnt < r_max; r_cnt++) */
LDNS_FREE(rd);
LDNS_FREE(xtok);
ldns_buffer_free(rr_buf);
LDNS_FREE(rdata);
if (ldns_buffer_remaining(rd_buf) > 0) {
ldns_buffer_free(rd_buf);
ldns_rr_free(new);
return LDNS_STATUS_SYNTAX_SUPERFLUOUS_TEXT_ERR;
}
ldns_buffer_free(rd_buf);
if (!question && desc && !was_unknown_rr_format &&
ldns_rr_rd_count(new) < r_min) {
ldns_rr_free(new);
return LDNS_STATUS_SYNTAX_MISSING_VALUE_ERR;
}
if (newrr) {
*newrr = new;
} else {
/* Maybe the caller just wanted to see if it would parse? */
ldns_rr_free(new);
}
return LDNS_STATUS_OK;
memerror:
status = LDNS_STATUS_MEM_ERR;
error:
if (rd_buf && rd_buf->_data) {
ldns_buffer_free(rd_buf);
} else {
LDNS_FREE(rd_buf);
}
if (rr_buf && rr_buf->_data) {
ldns_buffer_free(rr_buf);
} else {
LDNS_FREE(rr_buf);
}
LDNS_FREE(type);
LDNS_FREE(owner);
LDNS_FREE(ttl);
LDNS_FREE(clas);
LDNS_FREE(hex_data);
LDNS_FREE(hex_data_str);
LDNS_FREE(xtok);
LDNS_FREE(rd);
LDNS_FREE(rdata);
ldns_rr_free(new);
return status;
}
ldns_status
ldns_rr_new_frm_str(ldns_rr **newrr, const char *str,
uint32_t default_ttl, const ldns_rdf *origin,
ldns_rdf **prev)
{
return ldns_rr_new_frm_str_internal(newrr,
str,
default_ttl,
origin,
prev,
false);
}
ldns_status
ldns_rr_new_question_frm_str(ldns_rr **newrr, const char *str,
const ldns_rdf *origin, ldns_rdf **prev)
{
return ldns_rr_new_frm_str_internal(newrr,
str,
0,
origin,
prev,
true);
}
/* Strip whitespace from the start and the end of <line>. */
static char *
ldns_strip_ws(char *line)
{
char *s = line, *e;
for (s = line; *s && isspace((unsigned char)*s); s++)
;
for (e = strchr(s, 0); e > s+2 && isspace((unsigned char)e[-1]) && e[-2] != '\\'; e--)
;
*e = 0;
return s;
}
ldns_status
ldns_rr_new_frm_fp(ldns_rr **newrr, FILE *fp, uint32_t *ttl, ldns_rdf **origin, ldns_rdf **prev)
{
return ldns_rr_new_frm_fp_l(newrr, fp, ttl, origin, prev, NULL);
}
ldns_status
ldns_rr_new_frm_fp_l(ldns_rr **newrr, FILE *fp, uint32_t *default_ttl, ldns_rdf **origin, ldns_rdf **prev, int *line_nr)
{
char *line;
const char *endptr; /* unused */
ldns_rr *rr;
uint32_t ttl;
ldns_rdf *tmp;
ldns_status s;
ssize_t size;
if (default_ttl) {
ttl = *default_ttl;
} else {
ttl = 0;
}
line = LDNS_XMALLOC(char, LDNS_MAX_LINELEN + 1);
if (!line) {
return LDNS_STATUS_MEM_ERR;
}
/* read an entire line in from the file */
if ((size = ldns_fget_token_l(fp, line, LDNS_PARSE_SKIP_SPACE, LDNS_MAX_LINELEN, line_nr)) == -1) {
LDNS_FREE(line);
/* if last line was empty, we are now at feof, which is not
* always a parse error (happens when for instance last line
* was a comment)
*/
return LDNS_STATUS_SYNTAX_ERR;
}
/* we can have the situation, where we've read ok, but still got
* no bytes to play with, in this case size is 0
*/
if (size == 0) {
LDNS_FREE(line);
return LDNS_STATUS_SYNTAX_EMPTY;
}
if (strncmp(line, "$ORIGIN", 7) == 0 && isspace((unsigned char)line[7])) {
if (*origin) {
ldns_rdf_deep_free(*origin);
*origin = NULL;
}
tmp = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME,
ldns_strip_ws(line + 8));
if (!tmp) {
/* could not parse what next to $ORIGIN */
LDNS_FREE(line);
return LDNS_STATUS_SYNTAX_DNAME_ERR;
}
*origin = tmp;
s = LDNS_STATUS_SYNTAX_ORIGIN;
} else if (strncmp(line, "$TTL", 4) == 0 && isspace((unsigned char)line[4])) {
if (default_ttl) {
*default_ttl = ldns_str2period(
ldns_strip_ws(line + 5), &endptr);
}
s = LDNS_STATUS_SYNTAX_TTL;
} else if (strncmp(line, "$INCLUDE", 8) == 0) {
s = LDNS_STATUS_SYNTAX_INCLUDE;
} else if (!*ldns_strip_ws(line)) {
LDNS_FREE(line);
return LDNS_STATUS_SYNTAX_EMPTY;
} else {
if (origin && *origin) {
s = ldns_rr_new_frm_str(&rr, (const char*) line, ttl, *origin, prev);
} else {
s = ldns_rr_new_frm_str(&rr, (const char*) line, ttl, NULL, prev);
}
}
LDNS_FREE(line);
if (s == LDNS_STATUS_OK) {
if (newrr) {
*newrr = rr;
} else {
/* Just testing if it would parse? */
ldns_rr_free(rr);
}
}
return s;
}
void
ldns_rr_set_owner(ldns_rr *rr, ldns_rdf *owner)
{
rr->_owner = owner;
}
void
ldns_rr_set_question(ldns_rr *rr, bool question)
{
rr->_rr_question = question;
}
void
ldns_rr_set_ttl(ldns_rr *rr, uint32_t ttl)
{
rr->_ttl = ttl;
}
void
ldns_rr_set_rd_count(ldns_rr *rr, size_t count)
{
rr->_rd_count = count;
}
void
ldns_rr_set_type(ldns_rr *rr, ldns_rr_type rr_type)
{
rr->_rr_type = rr_type;
}
void
ldns_rr_set_class(ldns_rr *rr, ldns_rr_class rr_class)
{
rr->_rr_class = rr_class;
}
ldns_rdf *
ldns_rr_set_rdf(ldns_rr *rr, const ldns_rdf *f, size_t position)
{
size_t rd_count;
ldns_rdf *pop;
rd_count = ldns_rr_rd_count(rr);
if (position < rd_count) {
/* dicard the old one */
pop = rr->_rdata_fields[position];
rr->_rdata_fields[position] = (ldns_rdf*)f;
return pop;
} else {
return NULL;
}
}
bool
ldns_rr_push_rdf(ldns_rr *rr, const ldns_rdf *f)
{
size_t rd_count;
ldns_rdf **rdata_fields;
rd_count = ldns_rr_rd_count(rr);
/* grow the array */
rdata_fields = LDNS_XREALLOC(
rr->_rdata_fields, ldns_rdf *, rd_count + 1);
if (!rdata_fields) {
return false;
}
/* add the new member */
rr->_rdata_fields = rdata_fields;
rr->_rdata_fields[rd_count] = (ldns_rdf*)f;
ldns_rr_set_rd_count(rr, rd_count + 1);
return true;
}
ldns_rdf *
ldns_rr_pop_rdf(ldns_rr *rr)
{
size_t rd_count;
ldns_rdf *pop;
ldns_rdf** newrd;
rd_count = ldns_rr_rd_count(rr);
if (rd_count == 0) {
return NULL;
}
pop = rr->_rdata_fields[rd_count - 1];
/* try to shrink the array */
if(rd_count > 1) {
newrd = LDNS_XREALLOC(
rr->_rdata_fields, ldns_rdf *, rd_count - 1);
if(newrd)
rr->_rdata_fields = newrd;
} else {
LDNS_FREE(rr->_rdata_fields);
}
ldns_rr_set_rd_count(rr, rd_count - 1);
return pop;
}
ldns_rdf *
ldns_rr_rdf(const ldns_rr *rr, size_t nr)
{
if (rr && nr < ldns_rr_rd_count(rr)) {
return rr->_rdata_fields[nr];
} else {
return NULL;
}
}
ldns_rdf *
ldns_rr_owner(const ldns_rr *rr)
{
return rr->_owner;
}
bool
ldns_rr_is_question(const ldns_rr *rr)
{
return rr->_rr_question;
}
uint32_t
ldns_rr_ttl(const ldns_rr *rr)
{
return rr->_ttl;
}
size_t
ldns_rr_rd_count(const ldns_rr *rr)
{
return rr->_rd_count;
}
ldns_rr_type
ldns_rr_get_type(const ldns_rr *rr)
{
return rr->_rr_type;
}
ldns_rr_class
ldns_rr_get_class(const ldns_rr *rr)
{
return rr->_rr_class;
}
/* rr_lists */
size_t
ldns_rr_list_rr_count(const ldns_rr_list *rr_list)
{
if (rr_list) {
return rr_list->_rr_count;
} else {
return 0;
}
}
ldns_rr *
ldns_rr_list_set_rr(ldns_rr_list *rr_list, const ldns_rr *r, size_t count)
{
ldns_rr *old;
if (count > ldns_rr_list_rr_count(rr_list)) {
return NULL;
}
old = ldns_rr_list_rr(rr_list, count);
/* overwrite old's pointer */
rr_list->_rrs[count] = (ldns_rr*)r;
return old;
}
void
ldns_rr_list_set_rr_count(ldns_rr_list *rr_list, size_t count)
{
assert(count <= rr_list->_rr_capacity);
rr_list->_rr_count = count;
}
ldns_rr *
ldns_rr_list_rr(const ldns_rr_list *rr_list, size_t nr)
{
if (nr < ldns_rr_list_rr_count(rr_list)) {
return rr_list->_rrs[nr];
} else {
return NULL;
}
}
ldns_rr_list *
ldns_rr_list_new(void)
{
ldns_rr_list *rr_list = LDNS_MALLOC(ldns_rr_list);
if(!rr_list) return NULL;
rr_list->_rr_count = 0;
rr_list->_rr_capacity = 0;
rr_list->_rrs = NULL;
return rr_list;
}
void
ldns_rr_list_free(ldns_rr_list *rr_list)
{
if (rr_list) {
LDNS_FREE(rr_list->_rrs);