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src/sbin/unwind/libunbound/sldns/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 "sldns/str2wire.h"
#include "sldns/wire2str.h"
#include "sldns/sbuffer.h"
#include "sldns/parse.h"
#include "sldns/parseutil.h"
#include <ctype.h>
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
/** bits for the offset */
#define RET_OFFSET_MASK (((unsigned)(~LDNS_WIREPARSE_MASK))>>LDNS_WIREPARSE_SHIFT)
/** return an error */
#define RET_ERR(e, off) ((int)(((e)&LDNS_WIREPARSE_MASK)|(((off)&RET_OFFSET_MASK)<<LDNS_WIREPARSE_SHIFT)))
/** Move parse error but keep its ID */
#define RET_ERR_SHIFT(e, move) RET_ERR(LDNS_WIREPARSE_ERROR(e), LDNS_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 sldns_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 > LDNS_MAX_DOMAINLEN * 4) {
return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, 0);
}
if (0 == len) {
return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_UNDERFLOW, 0);
}
/* root label */
if (1 == len && *str == '.') {
if(*olen < 1)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, 0);
buf[0] = 0;
*olen = 1;
return LDNS_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(LDNS_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(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, q-buf);
if (q >= buf + LDNS_MAX_DOMAINLEN)
return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, q-buf);
switch (*s) {
case '.':
if (label_len > LDNS_MAX_LABELLEN) {
return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, q-buf);
}
if (label_len == 0) {
return RET_ERR(LDNS_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 (!sldns_parse_escape(q, &s)) {
*q = 0;
return RET_ERR(LDNS_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(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL, q-buf);
if (q >= buf + LDNS_MAX_DOMAINLEN) {
return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW, q-buf);
}
if (label_len > LDNS_MAX_LABELLEN) {
return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, q-buf);
}
if (label_len == 0) { /* label_len 0 but not . at end? */
return RET_ERR(LDNS_WIREPARSE_ERR_EMPTY_LABEL, q-buf);
}
len += label_len + 1;
*pq = label_len;
*q = 0;
}
len++;
*olen = len;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_dname_buf(const char* str, uint8_t* buf, size_t* len)
{
return sldns_str2wire_dname_buf_rel(str, buf, len, NULL);
}
int sldns_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 = sldns_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(LDNS_WIREPARSE_ERR_GENERAL, *len);
if(dlen + origin_len - 1 > LDNS_MAX_DOMAINLEN)
return RET_ERR(LDNS_WIREPARSE_ERR_DOMAINNAME_OVERFLOW,
LDNS_MAX_DOMAINLEN);
if(dlen + origin_len - 1 > *len)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
*len);
memmove(buf+dlen-1, origin, origin_len);
*len = dlen + origin_len - 1;
} else
*len = dlen;
return LDNS_WIREPARSE_ERR_OK;
}
uint8_t* sldns_str2wire_dname(const char* str, size_t* len)
{
uint8_t dname[LDNS_MAX_DOMAINLEN+1];
*len = sizeof(dname);
if(sldns_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(sldns_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(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX,
sldns_buffer_position(strbuf));
}
if(token_len < 2) /* make sure there is space to read "@" or "" */
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_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(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_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(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_buffer_position(strbuf));
memmove(rr, tocopy, *dname_len);
} else {
size_t dlen = *len;
int s = sldns_str2wire_dname_buf_origin(token, rr, &dlen,
origin, origin_len);
if(s) return RET_ERR_SHIFT(s,
sldns_buffer_position(strbuf)-strlen(token));
*dname_len = dlen;
}
return LDNS_WIREPARSE_ERR_OK;
}
/** read ttl */
static int
rrinternal_get_ttl(sldns_buffer* strbuf, char* token, size_t token_len,
int* not_there, uint32_t* ttl, uint32_t default_ttl)
{
const char* endptr;
int overflow;
if(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TTL,
sldns_buffer_position(strbuf));
}
*ttl = (uint32_t) sldns_str2period(token, &endptr, &overflow);
if(overflow) {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW,
sldns_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 = LDNS_DEFAULT_TTL;
} else {
*ttl = default_ttl;
}
}
return LDNS_WIREPARSE_ERR_OK;
}
/** read class */
static int
rrinternal_get_class(sldns_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(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_CLASS,
sldns_buffer_position(strbuf));
}
} else *not_there = 0;
*cl = sldns_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 = LDNS_RR_CLASS_IN;
}
return LDNS_WIREPARSE_ERR_OK;
}
/** read type */
static int
rrinternal_get_type(sldns_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(sldns_bget_token(strbuf, token, "\t\n ", token_len) == -1) {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TYPE,
sldns_buffer_position(strbuf));
}
}
*tp = sldns_get_rr_type_by_name(token);
if(*tp == 0 && strcmp(token, "TYPE0") != 0) {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TYPE,
sldns_buffer_position(strbuf));
}
return LDNS_WIREPARSE_ERR_OK;
}
/** put type, class, ttl into rr buffer */
static int
rrinternal_write_typeclassttl(sldns_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(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_buffer_position(strbuf));
sldns_write_uint16(rr+dname_len, tp);
sldns_write_uint16(rr+dname_len+2, cl);
return LDNS_WIREPARSE_ERR_OK;
}
/* type(2), class(2), ttl(4), rdatalen(2 (later)) = 10 */
if(dname_len + 10 > len)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_buffer_position(strbuf));
sldns_write_uint16(rr+dname_len, tp);
sldns_write_uint16(rr+dname_len+2, cl);
sldns_write_uint32(rr+dname_len+4, ttl);
sldns_write_uint16(rr+dname_len+8, 0); /* rdatalen placeholder */
return LDNS_WIREPARSE_ERR_OK;
}
/** find delimiters for type */
static const char*
rrinternal_get_delims(sldns_rdf_type rdftype, size_t r_cnt, size_t r_max)
{
switch(rdftype) {
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) {
return "\n";
}
break;
default : break;
}
return "\n\t ";
}
/* Syntactic sugar for sldns_rr_new_frm_str_internal */
static int
sldns_rdf_type_maybe_quoted(sldns_rdf_type rdf_type)
{
return rdf_type == LDNS_RDF_TYPE_STR ||
rdf_type == LDNS_RDF_TYPE_LONG_STR;
}
/** see if rdata is quoted */
static int
rrinternal_get_quoted(sldns_buffer* strbuf, const char** delimiters,
sldns_rdf_type rdftype)
{
if(sldns_rdf_type_maybe_quoted(rdftype) &&
sldns_buffer_remaining(strbuf) > 0) {
/* skip spaces */
while(sldns_buffer_remaining(strbuf) > 0 &&
(*(sldns_buffer_current(strbuf)) == ' ' ||
*(sldns_buffer_current(strbuf)) == '\t')) {
sldns_buffer_skip(strbuf, 1);
}
if(sldns_buffer_remaining(strbuf) > 0 &&
*(sldns_buffer_current(strbuf)) == '\"') {
*delimiters = "\"\0";
sldns_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(LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
p-token);
if(*cur_hex_data_size >= hex_data_size)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
p-token);
/* extra robust check */
if(rr_cur_len+(*cur_hex_data_size)/2 >= rr_len)
return RET_ERR(LDNS_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)sldns_hexdigit_to_int(*p)*16;
} else {
rr[rr_cur_len+(*cur_hex_data_size)/2] +=
(uint8_t)sldns_hexdigit_to_int(*p);
}
p++;
(*cur_hex_data_size)++;
}
return LDNS_WIREPARSE_ERR_OK;
}
/** read unknown rr type format */
static int
rrinternal_parse_unknown(sldns_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
*/
sldns_buffer_set_position(strbuf, pre_data_pos);
if(sldns_bget_token(strbuf, token, delim, token_len) == -1)
return LDNS_WIREPARSE_ERR_GENERAL; /* should not fail */
/* read rdata octet length */
if(sldns_bget_token(strbuf, token, delim, token_len) == -1) {
/* something goes very wrong here */
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
sldns_buffer_position(strbuf));
}
hex_data_size = (size_t)atoi(token);
if(hex_data_size > LDNS_MAX_RDFLEN ||
*rr_cur_len + hex_data_size > *rr_len) {
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_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 = sldns_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,
sldns_buffer_position(strbuf)-strlen(token));
if(c == -1) {
if(cur_hex_data_size != hex_data_size)
return RET_ERR(
LDNS_WIREPARSE_ERR_SYNTAX_RDATA,
sldns_buffer_position(strbuf));
break;
}
}
*rr_cur_len += hex_data_size/2;
return LDNS_WIREPARSE_ERR_OK;
}
/** parse normal RR rdata element */
static int
rrinternal_parse_rdf(sldns_buffer* strbuf, char* token, size_t token_len,
uint8_t* rr, size_t rr_len, size_t* rr_cur_len, sldns_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 LDNS_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 == LDNS_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(
LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_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 = sldns_str2wire_dname_buf_origin(token,
rr+*rr_cur_len, &dlen, origin, origin_len);
if(s) return RET_ERR_SHIFT(s,
sldns_buffer_position(strbuf)-strlen(token));
(*rr_cur_len) += dlen;
}
return LDNS_WIREPARSE_ERR_OK;
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) {
size_t tlen = strlen(token);
(void)sldns_bget_token(strbuf, token+tlen, "\n",
token_len - tlen);
}
break;
default:
break;
}
len = rr_len - (*rr_cur_len);
if((status=sldns_str2wire_rdf_buf(token, rr+(*rr_cur_len), &len,
rdftype)) != 0)
return RET_ERR_SHIFT(status,
sldns_buffer_position(strbuf)-strlen(token));
*rr_cur_len += len;
return LDNS_WIREPARSE_ERR_OK;
}
/**
* Parse one rdf token. Takes care of quotes and parenthesis.
*/
static int
sldns_parse_rdf_token(sldns_buffer* strbuf, char* token, size_t token_len,
int* quoted, int* parens, size_t* pre_data_pos,
const char* delimiters, sldns_rdf_type rdftype, size_t* token_strlen)
{
size_t slen;
/* skip spaces and tabs */
while(sldns_buffer_remaining(strbuf) > 0 && !*quoted &&
(*(sldns_buffer_current(strbuf)) == ' ' ||
*(sldns_buffer_current(strbuf)) == '\t')) {
sldns_buffer_skip(strbuf, 1);
}
*pre_data_pos = sldns_buffer_position(strbuf);
if(sldns_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 && sldns_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 && sldns_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(sldns_buffer_position(strbuf) > 0 &&
(sldns_buffer_current(strbuf)[-1] == ' ' ||
sldns_buffer_current(strbuf)[-1] == '\t')) {
sldns_buffer_skip(strbuf, -1);
}
if(sldns_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
sldns_affix_token(sldns_buffer* strbuf, char* token, size_t* token_len,
int* quoted, int* parens, size_t* pre_data_pos,
const char* delimiters, sldns_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(!sldns_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 sldns_str2wire_svcparam_key_cmp(const void *a, const void *b)
{
return sldns_read_uint16(*(uint8_t**) a)
- sldns_read_uint16(*(uint8_t**) b);
}
/**
* Add constraints to the SVCB RRs which involve the whole set
*/
static int sldns_str2wire_check_svcbparams(uint8_t* rdata, uint16_t rdata_len)
{
size_t nparams = 0, i;
uint8_t new_rdata[LDNS_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 LDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA;
svcbparam_len = sldns_read_uint16(rdata_ptr + 2);
rdata_remaining -= 4;
rdata_ptr += 4;
if (rdata_remaining < svcbparam_len)
return LDNS_WIREPARSE_ERR_SVCPARAM_BROKEN_RDATA;
rdata_remaining -= svcbparam_len;
rdata_ptr += svcbparam_len;
nparams += 1;
if (nparams >= MAX_NUMBER_OF_SVCPARAMS)
return LDNS_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*)
,sldns_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 = sldns_read_uint16(svcparams[i]);
if(i + 1 < nparams && key == sldns_read_uint16(svcparams[i+1]))
return LDNS_WIREPARSE_ERR_SVCB_DUPLICATE_KEYS;
if(key == SVCB_KEY_MANDATORY)
mandatory = svcparams[i];
}
/* Verify that all the SvcParamKeys in mandatory are present */
if(mandatory) {
/* Divide by sizeof(uint16_t)*/
uint16_t mandatory_nkeys = sldns_read_uint16(mandatory + 2) / sizeof(uint16_t);
/* Guaranteed by sldns_str2wire_svcparam_key_value */
assert(mandatory_nkeys > 0);
for(i=0; i < mandatory_nkeys; i++) {
uint16_t mandatory_key = sldns_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 == sldns_read_uint16(svcparams[j])) {
found = 1;
break;
}
}
if(!found)
return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_MISSING_PARAM;
}
}
}
#endif
/* Write rdata in correct order */
for (i = 0; i < nparams; i++) {
uint16_t svcparam_len = sldns_read_uint16(svcparams[i] + 2)
+ 2 * sizeof(uint16_t);
if ((unsigned)(new_rdata_ptr - new_rdata) + svcparam_len > sizeof(new_rdata))
return LDNS_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 LDNS_WIREPARSE_ERR_OK;
}
/** parse rdata from string into rr buffer(-remainder after dname). */
static int
rrinternal_parse_rdata(sldns_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 sldns_rr_descriptor *desc = sldns_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;
sldns_rdf_type rdftype;
/* a desc is always returned */
if(!desc) return LDNS_WIREPARSE_ERR_GENERAL;
r_max = sldns_rr_descriptor_maximum(desc);
r_min = sldns_rr_descriptor_minimum(desc);
/* robust check */
if(rr_cur_len > *rr_len)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_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 = sldns_rr_descriptor_field_type(desc, r_cnt);
delimiters = rrinternal_get_delims(rdftype, r_cnt, r_max);
quoted = rrinternal_get_quoted(strbuf, &delimiters, rdftype);
if(!sldns_parse_rdf_token(strbuf, token, token_len, &quoted,
&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 == LDNS_RDF_TYPE_HIP) {
/* affix the HIT and PK fields, with a space */
if(!sldns_affix_token(strbuf, token,
&token_len, &quoted, &parens,
&pre_data_pos, delimiters,
rdftype, &token_strlen))
break;
if(!sldns_affix_token(strbuf, token,
&token_len, &quoted, &parens,
&pre_data_pos, delimiters,
rdftype, &token_strlen))
break;
} else if(rdftype == LDNS_RDF_TYPE_INT16_DATA &&
strcmp(token, "0")!=0) {
/* affix len and b64 fields */
if(!sldns_affix_token(strbuf, token,
&token_len, &quoted, &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(LDNS_WIREPARSE_ERR_SYNTAX_MISSING_VALUE,
sldns_buffer_position(strbuf));
}
while(parens != 0) {
/* read remainder, must be "" */
if(sldns_bget_token_par(strbuf, token, "\n", token_len,
&parens, " \t") == -1) {
if(parens != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_PARENTHESIS,
sldns_buffer_position(strbuf));
break;
}
if(strcmp(token, "") != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_PARENTHESIS,
sldns_buffer_position(strbuf));
}
/* write rdata length */
sldns_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 == LDNS_RR_TYPE_SVCB || rr_type == LDNS_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 LDNS_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 LDNS_WIREPARSE_ERR_OK;
label_len = *rdata + 1;
if (rdata_len < label_len)
return LDNS_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 LDNS_WIREPARSE_ERR_OK;
rdata_len -= 1;
rdata += 1;
return sldns_str2wire_check_svcbparams(rdata, rdata_len);
}
return LDNS_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
sldns_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[LDNS_MAX_RDFLEN+1];
uint32_t ttl = 0;
uint16_t tp = 0, cl = 0;
size_t ddlen = 0;
/* string in buffer */
sldns_buffer strbuf;
sldns_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),
&not_there, &ttl, default_ttl)) != 0)
return status;
if((status=rrinternal_get_class(&strbuf, token, sizeof(token),
&not_there, &cl)) != 0)
return status;
if((status=rrinternal_get_type(&strbuf, token, sizeof(token),
&not_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 LDNS_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 LDNS_WIREPARSE_ERR_OK;
}
int sldns_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 sldns_str2wire_rr_buf_internal(str, rr, len, dname_len,
default_ttl, origin, origin_len, prev, prev_len, 0);
}
int sldns_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 sldns_str2wire_rr_buf_internal(str, rr, len, dname_len,
0, origin, origin_len, prev, prev_len, 1);
}
uint16_t sldns_wirerr_get_type(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+2)
return 0;
return sldns_read_uint16(rr+dname_len);
}
uint16_t sldns_wirerr_get_class(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+4)
return 0;
return sldns_read_uint16(rr+dname_len+2);
}
uint32_t sldns_wirerr_get_ttl(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+8)
return 0;
return sldns_read_uint32(rr+dname_len+4);
}
uint16_t sldns_wirerr_get_rdatalen(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+10)
return 0;
return sldns_read_uint16(rr+dname_len+8);
}
uint8_t* sldns_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* sldns_wirerr_get_rdatawl(uint8_t* rr, size_t len, size_t dname_len)
{
if(len < dname_len+10)
return NULL;
return rr+dname_len+8;
}
const char* sldns_get_errorstr_parse(int e)
{
sldns_lookup_table *lt;
lt = sldns_lookup_by_id(sldns_wireparse_errors, LDNS_WIREPARSE_ERROR(e));
return lt?lt->name:"unknown error";
}
/* Strip whitespace from the start and the end of <line>. */
char *
sldns_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;
}
int sldns_fp2wire_rr_buf(FILE* in, uint8_t* rr, size_t* len, size_t* dname_len,
struct sldns_file_parse_state* parse_state)
{
char line[LDNS_RR_BUF_SIZE+1];
ssize_t size;
/* read an entire line in from the file */
if((size = sldns_fget_token_l(in, line, LDNS_PARSE_SKIP_SPACE,
LDNS_RR_BUF_SIZE, parse_state?&parse_state->lineno:NULL))
== -1) {
/* 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_WIREPARSE_ERR_SYNTAX;
}
/* 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) {
if(*len > 0)
rr[0] = 0;
*len = 0;
*dname_len = 0;
return LDNS_WIREPARSE_ERR_OK;
}
if(strncmp(line, "$ORIGIN", 7) == 0 && isspace((unsigned char)line[7])) {
int s;
strlcpy((char*)rr, line, *len);
*len = 0;
*dname_len = 0;
if(!parse_state) return LDNS_WIREPARSE_ERR_OK;
parse_state->origin_len = sizeof(parse_state->origin);
s = sldns_str2wire_dname_buf(sldns_strip_ws(line+8),
parse_state->origin, &parse_state->origin_len);
if(s) parse_state->origin_len = 0;
return s;
} else if(strncmp(line, "$TTL", 4) == 0 && isspace((unsigned char)line[4])) {
const char* end = NULL;
int overflow = 0;
strlcpy((char*)rr, line, *len);
*len = 0;
*dname_len = 0;
if(!parse_state) return LDNS_WIREPARSE_ERR_OK;
parse_state->default_ttl = sldns_str2period(
sldns_strip_ws(line+5), &end, &overflow);
if(overflow)
return LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW;
} else if (strncmp(line, "$INCLUDE", 8) == 0) {
strlcpy((char*)rr, line, *len);
*len = 0;
*dname_len = 0;
return LDNS_WIREPARSE_ERR_INCLUDE;
} else if (strncmp(line, "$", 1) == 0) {
strlcpy((char*)rr, line, *len);
*len = 0;
*dname_len = 0;
return LDNS_WIREPARSE_ERR_INCLUDE;
} else {
int r = sldns_str2wire_rr_buf(line, rr, len, dname_len,
parse_state?parse_state->default_ttl:0,
(parse_state&&parse_state->origin_len)?
parse_state->origin:NULL,
parse_state?parse_state->origin_len:0,
(parse_state&&parse_state->prev_rr_len)?
parse_state->prev_rr:NULL,
parse_state?parse_state->prev_rr_len:0);
if(r == LDNS_WIREPARSE_ERR_OK && (*dname_len) != 0 &&
parse_state &&
(*dname_len) <= sizeof(parse_state->prev_rr)) {
memmove(parse_state->prev_rr, rr, *dname_len);
parse_state->prev_rr_len = (*dname_len);
}
if(r == LDNS_WIREPARSE_ERR_OK && parse_state) {
parse_state->default_ttl = sldns_wirerr_get_ttl(
rr, *len, *dname_len);
}
return r;
}
return LDNS_WIREPARSE_ERR_OK;
}
static int
sldns_str2wire_svcparam_key_lookup(const char *key, size_t key_len)
{
char buf[64];
char *endptr;
unsigned long int key_value;
if (key_len >= 4 && key_len <= 8 && !strncmp(key, "key", 3)) {
memcpy(buf, key + 3, key_len - 3);
buf[key_len - 3] = 0;
key_value = strtoul(buf, &endptr, 10);
if (endptr > buf /* digits seen */
&& *endptr == 0 /* no non-digit chars after digits */
&& key_value <= 65535) /* no overflow */
return key_value;
} else switch (key_len) {
case 3:
if (!strncmp(key, "ech", key_len))
return SVCB_KEY_ECH;
break;
case 4:
if (!strncmp(key, "alpn", key_len))
return SVCB_KEY_ALPN;
if (!strncmp(key, "port", key_len))
return SVCB_KEY_PORT;
break;
case 7:
if (!strncmp(key, "dohpath", key_len))
return SVCB_KEY_DOHPATH;
break;
case 8:
if (!strncmp(key, "ipv4hint", key_len))
return SVCB_KEY_IPV4HINT;
if (!strncmp(key, "ipv6hint", key_len))
return SVCB_KEY_IPV6HINT;
break;
case 9:
if (!strncmp(key, "mandatory", key_len))
return SVCB_KEY_MANDATORY;
if (!strncmp(key, "echconfig", key_len))
return SVCB_KEY_ECH; /* allow "echconfig" as well as "ech" */
break;
case 15:
if (!strncmp(key, "no-default-alpn", key_len))
return SVCB_KEY_NO_DEFAULT_ALPN;
break;
default:
break;
}
/* Although the returned value might be used by the caller,
* the parser has erred, so the zone will not be loaded.
*/
return -1;
}
static int
sldns_str2wire_svcparam_port(const char* val, uint8_t* rd, size_t* rd_len)
{
unsigned long int port;
char *endptr;
if (*rd_len < 6)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
port = strtoul(val, &endptr, 10);
if (endptr > val /* digits seen */
&& *endptr == 0 /* no non-digit chars after digits */
&& port <= 65535) { /* no overflow */
sldns_write_uint16(rd, SVCB_KEY_PORT);
sldns_write_uint16(rd + 2, sizeof(uint16_t));
sldns_write_uint16(rd + 4, port);
*rd_len = 6;
return LDNS_WIREPARSE_ERR_OK;
}
return LDNS_WIREPARSE_ERR_SVCB_PORT_VALUE_SYNTAX;
}
static int
sldns_str2wire_svcbparam_ipv4hint(const char* val, uint8_t* rd, size_t* rd_len)
{
size_t count;
char ip_str[INET_ADDRSTRLEN+1];
char *next_ip_str;
size_t i;
for (i = 0, count = 1; val[i]; i++) {
if (val[i] == ',')
count += 1;
if (count > SVCB_MAX_COMMA_SEPARATED_VALUES) {
return LDNS_WIREPARSE_ERR_SVCB_IPV4_TOO_MANY_ADDRESSES;
}
}
if (*rd_len < (LDNS_IP4ADDRLEN * count) + 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
/* count is number of comma's in val + 1; so the actual number of IPv4
* addresses in val
*/
sldns_write_uint16(rd, SVCB_KEY_IPV4HINT);
sldns_write_uint16(rd + 2, LDNS_IP4ADDRLEN * count);
*rd_len = 4;
while (count) {
if (!(next_ip_str = strchr(val, ','))) {
if (inet_pton(AF_INET, val, rd + *rd_len) != 1)
break;
*rd_len += LDNS_IP4ADDRLEN;
assert(count == 1);
} else if (next_ip_str - val >= (int)sizeof(ip_str))
break;
else {
memcpy(ip_str, val, next_ip_str - val);
ip_str[next_ip_str - val] = 0;
if (inet_pton(AF_INET, ip_str, rd + *rd_len) != 1) {
break;
}
*rd_len += LDNS_IP4ADDRLEN;
val = next_ip_str + 1;
}
count--;
}
if (count) /* verify that we parsed all values */
return LDNS_WIREPARSE_ERR_SYNTAX_IP4;
return LDNS_WIREPARSE_ERR_OK;
}
static int
sldns_str2wire_svcbparam_ipv6hint(const char* val, uint8_t* rd, size_t* rd_len)
{
size_t count;
char ip_str[INET6_ADDRSTRLEN+1];
char *next_ip_str;
size_t i;
for (i = 0, count = 1; val[i]; i++) {
if (val[i] == ',')
count += 1;
if (count > SVCB_MAX_COMMA_SEPARATED_VALUES) {
return LDNS_WIREPARSE_ERR_SVCB_IPV6_TOO_MANY_ADDRESSES;
}
}
if (*rd_len < (LDNS_IP6ADDRLEN * count) + 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
/* count is number of comma's in val + 1; so the actual number of IPv6
* addresses in val
*/
sldns_write_uint16(rd, SVCB_KEY_IPV6HINT);
sldns_write_uint16(rd + 2, LDNS_IP6ADDRLEN * count);
*rd_len = 4;
while (count) {
if (!(next_ip_str = strchr(val, ','))) {
if (inet_pton(AF_INET6, val, rd + *rd_len) != 1)
break;
*rd_len += LDNS_IP6ADDRLEN;
assert(count == 1);
} else if (next_ip_str - val >= (int)sizeof(ip_str))
break;
else {
memcpy(ip_str, val, next_ip_str - val);
ip_str[next_ip_str - val] = 0;
if (inet_pton(AF_INET6, ip_str, rd + *rd_len) != 1) {
break;
}
*rd_len += LDNS_IP6ADDRLEN;
val = next_ip_str + 1;
}
count--;
}
if (count) /* verify that we parsed all values */
return LDNS_WIREPARSE_ERR_SYNTAX_IP6;
return LDNS_WIREPARSE_ERR_OK;
}
/* compare function used for sorting uint16_t's */
static int
sldns_network_uint16_cmp(const void *a, const void *b)
{
return ((int)sldns_read_uint16(a)) - ((int)sldns_read_uint16(b));
}
static int
sldns_str2wire_svcbparam_mandatory(const char* val, uint8_t* rd, size_t* rd_len)
{
size_t i, count, val_len;
char* next_key;
val_len = strlen(val);
for (i = 0, count = 1; val[i]; i++) {
if (val[i] == ',')
count += 1;
if (count > SVCB_MAX_COMMA_SEPARATED_VALUES) {
return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_TOO_MANY_KEYS;
}
}
if (sizeof(uint16_t) * (count + 2) > *rd_len)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, SVCB_KEY_MANDATORY);
sldns_write_uint16(rd + 2, sizeof(uint16_t) * count);
*rd_len = 4;
while (1) {
int svcparamkey;
if (!(next_key = strchr(val, ','))) {
svcparamkey = sldns_str2wire_svcparam_key_lookup(val, val_len);
if (svcparamkey < 0) {
return LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY;
}
sldns_write_uint16(rd + *rd_len, svcparamkey);
*rd_len += 2;
break;
} else {
svcparamkey = sldns_str2wire_svcparam_key_lookup(val, next_key - val);
if (svcparamkey < 0) {
return LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY;
}
sldns_write_uint16(rd + *rd_len,
svcparamkey);
*rd_len += 2;
}
val_len -= next_key - val + 1;
val = next_key + 1; /* skip the comma */
}
/* 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 *)(rd + 4), count, sizeof(uint16_t), sldns_network_uint16_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
/* In draft-ietf-dnsop-svcb-https-06 Section 8
* automatically mandatory MUST NOT appear in its own value-list
*/
if (sldns_read_uint16(rd + 4) == SVCB_KEY_MANDATORY)
return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_IN_MANDATORY;
/* Guarantee key uniqueness. After the sort we only need to
* compare neighbouring keys */
if (count > 1) {
for (i = 0; i < count - 1; i++) {
uint8_t* current_pos = (rd + 4 + (sizeof(uint16_t) * i));
uint16_t key = sldns_read_uint16(current_pos);
if (key == sldns_read_uint16(current_pos + 2)) {
return LDNS_WIREPARSE_ERR_SVCB_MANDATORY_DUPLICATE_KEY;
}
}
}
#endif
return LDNS_WIREPARSE_ERR_OK;
}
static int
sldns_str2wire_svcbparam_ech_value(const char* val, uint8_t* rd, size_t* rd_len)
{
uint8_t buffer[LDNS_MAX_RDFLEN];
int wire_len;
/* single 0 represents empty buffer */
if(strcmp(val, "0") == 0) {
if (*rd_len < 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, SVCB_KEY_ECH);
sldns_write_uint16(rd + 2, 0);
return LDNS_WIREPARSE_ERR_OK;
}
wire_len = sldns_b64_pton(val, buffer, LDNS_MAX_RDFLEN);
if (wire_len <= 0) {
return LDNS_WIREPARSE_ERR_SYNTAX_B64;
} else if ((unsigned)wire_len + 4 > *rd_len) {
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
} else {
sldns_write_uint16(rd, SVCB_KEY_ECH);
sldns_write_uint16(rd + 2, wire_len);
memcpy(rd + 4, buffer, wire_len);
*rd_len = 4 + wire_len;
return LDNS_WIREPARSE_ERR_OK;
}
}
static const char*
sldns_str2wire_svcbparam_parse_next_unescaped_comma(const char *val)
{
while (*val) {
/* Only return when the comma is not escaped*/
if (*val == '\\'){
++val;
if (!*val)
break;
} else if (*val == ',')
return val;
val++;
}
return NULL;
}
/* The source is already properly unescaped, this double unescaping is purely to allow for
* comma's in comma separated alpn lists.
*
* In draft-ietf-dnsop-svcb-https-06 Section 7:
* To enable simpler parsing, this SvcParamValue MUST NOT contain escape sequences.
*/
static size_t
sldns_str2wire_svcbparam_parse_copy_unescaped(uint8_t *dst,
const char *src, size_t len)
{
uint8_t *orig_dst = dst;
while (len) {
if (*src == '\\') {
src++;
len--;
if (!len)
break;
}
*dst++ = *src++;
len--;
}
return (size_t)(dst - orig_dst);
}
static int
sldns_str2wire_svcbparam_alpn_value(const char* val,
uint8_t* rd, size_t* rd_len)
{
uint8_t unescaped_dst[LDNS_MAX_RDFLEN];
uint8_t *dst = unescaped_dst;
const char *next_str;
size_t str_len;
size_t dst_len;
size_t val_len;
val_len = strlen(val);
if (val_len > sizeof(unescaped_dst)) {
return LDNS_WIREPARSE_ERR_SVCB_ALPN_KEY_TOO_LARGE;
}
while (val_len) {
size_t key_len;
str_len = (next_str = sldns_str2wire_svcbparam_parse_next_unescaped_comma(val))
? (size_t)(next_str - val) : val_len;
if (str_len > 255) {
return LDNS_WIREPARSE_ERR_SVCB_ALPN_KEY_TOO_LARGE;
}
key_len = sldns_str2wire_svcbparam_parse_copy_unescaped(dst + 1, val, str_len);
*dst++ = key_len;
dst += key_len;
if (!next_str)
break;
/* skip the comma in the next iteration */
val_len -= next_str - val + 1;
val = next_str + 1;
}
dst_len = dst - unescaped_dst;
if (*rd_len < 4 + dst_len)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, SVCB_KEY_ALPN);
sldns_write_uint16(rd + 2, dst_len);
memcpy(rd + 4, unescaped_dst, dst_len);
*rd_len = 4 + dst_len;
return LDNS_WIREPARSE_ERR_OK;
}
static int
sldns_str2wire_svcbparam_dohpath_value(const char* val,
uint8_t* rd, size_t* rd_len)
{
size_t val_len;
/* RFC6570#section-2.1
* "The characters outside of expressions in a URI Template string are
* intended to be copied literally"
* Practically this means we do not have to look for "double escapes"
* like in the alpn value list.
*/
val_len = strlen(val);
if (*rd_len < 4 + val_len) {
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
}
sldns_write_uint16(rd, SVCB_KEY_DOHPATH);
sldns_write_uint16(rd + 2, val_len);
memcpy(rd + 4, val, val_len);
*rd_len = 4 + val_len;
return LDNS_WIREPARSE_ERR_OK;
}
static int
sldns_str2wire_svcparam_value(const char *key, size_t key_len,
const char *val, uint8_t* rd, size_t* rd_len)
{
size_t str_len;
int svcparamkey = sldns_str2wire_svcparam_key_lookup(key, key_len);
if (svcparamkey < 0) {
return LDNS_WIREPARSE_ERR_SVCB_UNKNOWN_KEY;
}
/* key without value */
if (val == NULL) {
switch (svcparamkey) {
#ifdef SVCB_SEMANTIC_ERRORS
case SVCB_KEY_MANDATORY:
case SVCB_KEY_ALPN:
case SVCB_KEY_PORT:
case SVCB_KEY_IPV4HINT:
case SVCB_KEY_IPV6HINT:
case SVCB_KEY_DOHPATH:
return LDNS_WIREPARSE_ERR_SVCB_MISSING_PARAM;
#endif
default:
if (*rd_len < 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, svcparamkey);
sldns_write_uint16(rd + 2, 0);
*rd_len = 4;
return LDNS_WIREPARSE_ERR_OK;
}
}
/* value is non-empty */
switch (svcparamkey) {
case SVCB_KEY_PORT:
return sldns_str2wire_svcparam_port(val, rd, rd_len);
case SVCB_KEY_IPV4HINT:
return sldns_str2wire_svcbparam_ipv4hint(val, rd, rd_len);
case SVCB_KEY_IPV6HINT:
return sldns_str2wire_svcbparam_ipv6hint(val, rd, rd_len);
case SVCB_KEY_MANDATORY:
return sldns_str2wire_svcbparam_mandatory(val, rd, rd_len);
#ifdef SVCB_SEMANTIC_ERRORS
case SVCB_KEY_NO_DEFAULT_ALPN:
return LDNS_WIREPARSE_ERR_SVCB_NO_DEFAULT_ALPN_VALUE;
#endif
case SVCB_KEY_ECH:
return sldns_str2wire_svcbparam_ech_value(val, rd, rd_len);
case SVCB_KEY_ALPN:
return sldns_str2wire_svcbparam_alpn_value(val, rd, rd_len);
case SVCB_KEY_DOHPATH:
return sldns_str2wire_svcbparam_dohpath_value(val, rd, rd_len);
default:
str_len = strlen(val);
if (*rd_len < 4 + str_len)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, svcparamkey);
sldns_write_uint16(rd + 2, str_len);
memcpy(rd + 4, val, str_len);
*rd_len = 4 + str_len;
return LDNS_WIREPARSE_ERR_OK;
}
return LDNS_WIREPARSE_ERR_GENERAL;
}
static int sldns_str2wire_svcparam_buf(const char* str, uint8_t* rd, size_t* rd_len)
{
const char* eq_pos;
char unescaped_val[LDNS_MAX_RDFLEN];
char* val_out = unescaped_val;
const char* val_in;
eq_pos = strchr(str, '=');
/* case: key=value */
if (eq_pos != NULL && eq_pos[1]) {
val_in = eq_pos + 1;
/* unescape characters and "" blocks */
if (*val_in == '"') {
val_in++;
while (*val_in != '"'
&& (size_t)(val_out - unescaped_val + 1) < sizeof(unescaped_val)
&& sldns_parse_char( (uint8_t*) val_out, &val_in)) {
val_out++;
}
} else {
while ((size_t)(val_out - unescaped_val + 1) < sizeof(unescaped_val)
&& sldns_parse_char( (uint8_t*) val_out, &val_in)) {
val_out++;
}
}
*val_out = 0;
return sldns_str2wire_svcparam_value(str, eq_pos - str,
unescaped_val[0] ? unescaped_val : NULL, rd, rd_len);
}
/* case: key= */
else if (eq_pos != NULL && !(eq_pos[1])) {
return sldns_str2wire_svcparam_value(str, eq_pos - str, NULL, rd, rd_len);
}
/* case: key */
else {
return sldns_str2wire_svcparam_value(str, strlen(str), NULL, rd, rd_len);
}
}
int sldns_str2wire_rdf_buf(const char* str, uint8_t* rd, size_t* len,
sldns_rdf_type rdftype)
{
switch (rdftype) {
case LDNS_RDF_TYPE_DNAME:
return sldns_str2wire_dname_buf(str, rd, len);
case LDNS_RDF_TYPE_INT8:
return sldns_str2wire_int8_buf(str, rd, len);
case LDNS_RDF_TYPE_INT16:
return sldns_str2wire_int16_buf(str, rd, len);
case LDNS_RDF_TYPE_INT32:
return sldns_str2wire_int32_buf(str, rd, len);
case LDNS_RDF_TYPE_A:
return sldns_str2wire_a_buf(str, rd, len);
case LDNS_RDF_TYPE_AAAA:
return sldns_str2wire_aaaa_buf(str, rd, len);
case LDNS_RDF_TYPE_STR:
return sldns_str2wire_str_buf(str, rd, len);
case LDNS_RDF_TYPE_APL:
return sldns_str2wire_apl_buf(str, rd, len);
case LDNS_RDF_TYPE_B64:
return sldns_str2wire_b64_buf(str, rd, len);
case LDNS_RDF_TYPE_B32_EXT:
return sldns_str2wire_b32_ext_buf(str, rd, len);
case LDNS_RDF_TYPE_HEX:
return sldns_str2wire_hex_buf(str, rd, len);
case LDNS_RDF_TYPE_NSEC:
return sldns_str2wire_nsec_buf(str, rd, len);
case LDNS_RDF_TYPE_TYPE:
return sldns_str2wire_type_buf(str, rd, len);
case LDNS_RDF_TYPE_CLASS:
return sldns_str2wire_class_buf(str, rd, len);
case LDNS_RDF_TYPE_CERT_ALG:
return sldns_str2wire_cert_alg_buf(str, rd, len);
case LDNS_RDF_TYPE_ALG:
return sldns_str2wire_alg_buf(str, rd, len);
case LDNS_RDF_TYPE_TIME:
return sldns_str2wire_time_buf(str, rd, len);
case LDNS_RDF_TYPE_PERIOD:
return sldns_str2wire_period_buf(str, rd, len);
case LDNS_RDF_TYPE_TSIGTIME:
return sldns_str2wire_tsigtime_buf(str, rd, len);
case LDNS_RDF_TYPE_LOC:
return sldns_str2wire_loc_buf(str, rd, len);
case LDNS_RDF_TYPE_WKS:
return sldns_str2wire_wks_buf(str, rd, len);
case LDNS_RDF_TYPE_NSAP:
return sldns_str2wire_nsap_buf(str, rd, len);
case LDNS_RDF_TYPE_ATMA:
return sldns_str2wire_atma_buf(str, rd, len);
case LDNS_RDF_TYPE_IPSECKEY:
return sldns_str2wire_ipseckey_buf(str, rd, len);
case LDNS_RDF_TYPE_NSEC3_SALT:
return sldns_str2wire_nsec3_salt_buf(str, rd, len);
case LDNS_RDF_TYPE_NSEC3_NEXT_OWNER:
return sldns_str2wire_b32_ext_buf(str, rd, len);
case LDNS_RDF_TYPE_ILNP64:
return sldns_str2wire_ilnp64_buf(str, rd, len);
case LDNS_RDF_TYPE_EUI48:
return sldns_str2wire_eui48_buf(str, rd, len);
case LDNS_RDF_TYPE_EUI64:
return sldns_str2wire_eui64_buf(str, rd, len);
case LDNS_RDF_TYPE_TAG:
return sldns_str2wire_tag_buf(str, rd, len);
case LDNS_RDF_TYPE_LONG_STR:
return sldns_str2wire_long_str_buf(str, rd, len);
case LDNS_RDF_TYPE_TSIGERROR:
return sldns_str2wire_tsigerror_buf(str, rd, len);
case LDNS_RDF_TYPE_HIP:
return sldns_str2wire_hip_buf(str, rd, len);
case LDNS_RDF_TYPE_INT16_DATA:
return sldns_str2wire_int16_data_buf(str, rd, len);
case LDNS_RDF_TYPE_SVCPARAM:
return sldns_str2wire_svcparam_buf(str, rd, len);
case LDNS_RDF_TYPE_UNKNOWN:
case LDNS_RDF_TYPE_SERVICE:
return LDNS_WIREPARSE_ERR_NOT_IMPL;
case LDNS_RDF_TYPE_NONE:
default:
break;
}
return LDNS_WIREPARSE_ERR_GENERAL;
}
int sldns_str2wire_int8_buf(const char* str, uint8_t* rd, size_t* len)
{
char* end;
uint8_t r = (uint8_t)strtol((char*)str, &end, 10);
if(*end != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, end-(char*)str);
if(*len < 1)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
rd[0] = r;
*len = 1;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_int16_buf(const char* str, uint8_t* rd, size_t* len)
{
char* end;
uint16_t r = (uint16_t)strtol((char*)str, &end, 10);
if(*end != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, end-(char*)str);
if(*len < 2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, r);
*len = 2;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_int32_buf(const char* str, uint8_t* rd, size_t* len)
{
char* end;
uint32_t r;
errno = 0; /* must set to zero before call,
note race condition on errno */
if(*str == '-')
r = (uint32_t)strtol((char*)str, &end, 10);
else r = (uint32_t)strtoul((char*)str, &end, 10);
if(*end != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, end-(char*)str);
if(errno == ERANGE)
return LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW;
if(*len < 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint32(rd, r);
*len = 4;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_a_buf(const char* str, uint8_t* rd, size_t* len)
{
struct in_addr address;
if(inet_pton(AF_INET, (char*)str, &address) != 1)
return LDNS_WIREPARSE_ERR_SYNTAX_IP4;
if(*len < sizeof(address))
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
memmove(rd, &address, sizeof(address));
*len = sizeof(address);
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_aaaa_buf(const char* str, uint8_t* rd, size_t* len)
{
#ifdef AF_INET6
uint8_t address[LDNS_IP6ADDRLEN + 1];
if(inet_pton(AF_INET6, (char*)str, address) != 1)
return LDNS_WIREPARSE_ERR_SYNTAX_IP6;
if(*len < LDNS_IP6ADDRLEN)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
memmove(rd, address, LDNS_IP6ADDRLEN);
*len = LDNS_IP6ADDRLEN;
return LDNS_WIREPARSE_ERR_OK;
#else
return LDNS_WIREPARSE_ERR_NOT_IMPL;
#endif
}
int sldns_str2wire_str_buf(const char* str, uint8_t* rd, size_t* len)
{
uint8_t ch = 0;
size_t sl = 0;
const char* s = str;
/* skip length byte */
if(*len < 1)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
/* read characters */
while(sldns_parse_char(&ch, &s)) {
if(sl >= 255)
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR, s-str);
if(*len < sl+2)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
s-str);
rd[++sl] = ch;
}
if(!s)
return LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE;
rd[0] = (uint8_t)sl;
*len = sl+1;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_apl_buf(const char* str, uint8_t* rd, size_t* len)
{
const char *my_str = str;
char my_ip_str[64];
size_t ip_str_len;
uint16_t family;
int negation;
size_t adflength = 0;
uint8_t data[16+4];
uint8_t prefix;
size_t i;
if(*my_str == '\0') {
/* empty APL element, no data, no string */
*len = 0;
return LDNS_WIREPARSE_ERR_OK;
}
/* [!]afi:address/prefix */
if (strlen(my_str) < 2
|| strchr(my_str, ':') == NULL
|| strchr(my_str, '/') == NULL
|| strchr(my_str, ':') > strchr(my_str, '/')) {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
if (my_str[0] == '!') {
negation = 1;
my_str += 1;
} else {
negation = 0;
}
family = (uint16_t) atoi(my_str);
my_str = strchr(my_str, ':') + 1;
/* need ip addr and only ip addr for inet_pton */
ip_str_len = (size_t) (strchr(my_str, '/') - my_str);
if(ip_str_len+1 > sizeof(my_ip_str))
return LDNS_WIREPARSE_ERR_INVALID_STR;
(void)strlcpy(my_ip_str, my_str, sizeof(my_ip_str));
my_ip_str[ip_str_len] = 0;
if (family == 1) {
/* ipv4 */
if(inet_pton(AF_INET, my_ip_str, data+4) == 0)
return LDNS_WIREPARSE_ERR_INVALID_STR;
for (i = 0; i < 4; i++) {
if (data[i+4] != 0) {
adflength = i + 1;
}
}
} else if (family == 2) {
/* ipv6 */
if (inet_pton(AF_INET6, my_ip_str, data+4) == 0)
return LDNS_WIREPARSE_ERR_INVALID_STR;
for (i = 0; i < 16; i++) {
if (data[i+4] != 0) {
adflength = i + 1;
}
}
} else {
/* unknown family */
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
my_str = strchr(my_str, '/') + 1;
prefix = (uint8_t) atoi(my_str);
sldns_write_uint16(data, family);
data[2] = prefix;
data[3] = (uint8_t)adflength;
if (negation) {
/* set bit 1 of byte 3 */
data[3] = data[3] | 0x80;
}
if(*len < 4+adflength)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
memmove(rd, data, 4+adflength);
*len = 4+adflength;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_b64_buf(const char* str, uint8_t* rd, size_t* len)
{
size_t sz = sldns_b64_pton_calculate_size(strlen(str));
int n;
if(strcmp(str, "0") == 0) {
*len = 0;
return LDNS_WIREPARSE_ERR_OK;
}
if(*len < sz)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
n = sldns_b64_pton(str, rd, *len);
if(n < 0)
return LDNS_WIREPARSE_ERR_SYNTAX_B64;
*len = (size_t)n;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_b32_ext_buf(const char* str, uint8_t* rd, size_t* len)
{
size_t slen = strlen(str);
size_t sz = sldns_b32_pton_calculate_size(slen);
int n;
if(*len < 1+sz)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
rd[0] = (uint8_t)sz;
n = sldns_b32_pton_extended_hex(str, slen, rd+1, *len-1);
if(n < 0)
return LDNS_WIREPARSE_ERR_SYNTAX_B32_EXT;
*len = (size_t)n+1;
return LDNS_WIREPARSE_ERR_OK;
}
/** see if the string ends, or ends in whitespace */
static int
sldns_is_last_of_string(const char* str)
{
if(*str == 0) return 1;
while(isspace((unsigned char)*str))
str++;
if(*str == 0) return 1;
return 0;
}
int sldns_str2wire_hex_buf(const char* str, uint8_t* rd, size_t* len)
{
const char* s = str;
size_t dlen = 0; /* number of hexdigits parsed */
while(*s) {
if(isspace((unsigned char)*s)) {
s++;
continue;
}
if(dlen == 0 && *s == '0' && sldns_is_last_of_string(s+1)) {
*len = 0;
return LDNS_WIREPARSE_ERR_OK;
}
if(!isxdigit((unsigned char)*s))
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
if(*len < dlen/2 + 1)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
s-str);
if((dlen&1)==0)
rd[dlen/2] = (uint8_t)sldns_hexdigit_to_int(*s++) * 16;
else rd[dlen/2] += (uint8_t)sldns_hexdigit_to_int(*s++);
dlen++;
}
if((dlen&1)!=0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
*len = dlen/2;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_nsec_buf(const char* str, uint8_t* rd, size_t* len)
{
const char *delim = "\n\t ";
char token[64]; /* for a type name */
size_t type_count = 0;
int block;
size_t used = 0;
uint16_t maxtype = 0;
uint8_t typebits[8192]; /* 65536 bits */
uint8_t window_in_use[256];
/* string in buffer */
sldns_buffer strbuf;
sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
/* parse the types */
memset(typebits, 0, sizeof(typebits));
memset(window_in_use, 0, sizeof(window_in_use));
while(sldns_buffer_remaining(&strbuf) > 0 &&
sldns_bget_token(&strbuf, token, delim, sizeof(token)) != -1) {
uint16_t t = sldns_get_rr_type_by_name(token);
if(token[0] == 0)
continue;
if(t == 0 && strcmp(token, "TYPE0") != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TYPE,
sldns_buffer_position(&strbuf));
typebits[t/8] |= (0x80>>(t%8));
window_in_use[t/256] = 1;
type_count++;
if(t > maxtype) maxtype = t;
}
/* empty NSEC bitmap */
if(type_count == 0) {
*len = 0;
return LDNS_WIREPARSE_ERR_OK;
}
/* encode windows {u8 windowblock, u8 bitmaplength, 0-32u8 bitmap},
* block is 0-255 upper octet of types, length if 0-32. */
for(block = 0; block <= (int)maxtype/256; block++) {
int i, blocklen = 0;
if(!window_in_use[block])
continue;
for(i=0; i<32; i++) {
if(typebits[block*32+i] != 0)
blocklen = i+1;
}
if(blocklen == 0)
continue; /* empty window should have been !in_use */
if(used+blocklen+2 > *len)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
rd[used+0] = (uint8_t)block;
rd[used+1] = (uint8_t)blocklen;
for(i=0; i<blocklen; i++) {
rd[used+2+i] = typebits[block*32+i];
}
used += blocklen+2;
}
*len = used;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_type_buf(const char* str, uint8_t* rd, size_t* len)
{
uint16_t t = sldns_get_rr_type_by_name(str);
if(t == 0 && strcmp(str, "TYPE0") != 0)
return LDNS_WIREPARSE_ERR_SYNTAX_TYPE;
if(*len < 2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, t);
*len = 2;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_class_buf(const char* str, uint8_t* rd, size_t* len)
{
uint16_t c = sldns_get_rr_class_by_name(str);
if(c == 0 && strcmp(str, "CLASS0") != 0)
return LDNS_WIREPARSE_ERR_SYNTAX_CLASS;
if(*len < 2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint16(rd, c);
*len = 2;
return LDNS_WIREPARSE_ERR_OK;
}
/* An certificate alg field can either be specified as a 8 bits number
* or by its symbolic name. Handle both */
int sldns_str2wire_cert_alg_buf(const char* str, uint8_t* rd, size_t* len)
{
sldns_lookup_table *lt = sldns_lookup_by_name(sldns_cert_algorithms,
str);
if(*len < 2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if(lt) {
sldns_write_uint16(rd, (uint16_t)lt->id);
} else {
int s = sldns_str2wire_int16_buf(str, rd, len);
if(s) return s;
if(sldns_read_uint16(rd) == 0)
return LDNS_WIREPARSE_ERR_CERT_BAD_ALGORITHM;
}
*len = 2;
return LDNS_WIREPARSE_ERR_OK;
}
/* An alg field can either be specified as a 8 bits number
* or by its symbolic name. Handle both */
int sldns_str2wire_alg_buf(const char* str, uint8_t* rd, size_t* len)
{
sldns_lookup_table *lt = sldns_lookup_by_name(sldns_algorithms, str);
if(*len < 1)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if(lt) {
rd[0] = (uint8_t)lt->id;
*len = 1;
} else {
/* try as-is (a number) */
return sldns_str2wire_int8_buf(str, rd, len);
}
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_tsigerror_buf(const char* str, uint8_t* rd, size_t* len)
{
sldns_lookup_table *lt = sldns_lookup_by_name(sldns_tsig_errors, str);
if(*len < 2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if(lt) {
sldns_write_uint16(rd, (uint16_t)lt->id);
*len = 2;
} else {
/* try as-is (a number) */
return sldns_str2wire_int16_buf(str, rd, len);
}
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_time_buf(const char* str, uint8_t* rd, size_t* len)
{
/* convert a time YYYYDDMMHHMMSS to wireformat */
struct tm tm;
if(*len < 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
/* Try to scan the time... */
memset(&tm, 0, sizeof(tm));
if (strlen(str) == 14 && sscanf(str, "%4d%2d%2d%2d%2d%2d",
&tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
&tm.tm_min, &tm.tm_sec) == 6) {
tm.tm_year -= 1900;
tm.tm_mon--;
/* Check values */
if (tm.tm_year < 70)
return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
if (tm.tm_mon < 0 || tm.tm_mon > 11)
return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
if (tm.tm_mday < 1 || tm.tm_mday > 31)
return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
if (tm.tm_hour < 0 || tm.tm_hour > 23)
return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
if (tm.tm_min < 0 || tm.tm_min > 59)
return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
if (tm.tm_sec < 0 || tm.tm_sec > 59)
return LDNS_WIREPARSE_ERR_SYNTAX_TIME;
sldns_write_uint32(rd, (uint32_t)sldns_mktime_from_utc(&tm));
} else {
/* handle it as 32 bits timestamp */
char *end;
uint32_t l = (uint32_t)strtol((char*)str, &end, 10);
if(*end != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TIME,
end-(char*)str);
sldns_write_uint32(rd, l);
}
*len = 4;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_tsigtime_buf(const char* str, uint8_t* rd, size_t* len)
{
char* end;
uint64_t t = (uint64_t)strtol((char*)str, &end, 10);
uint16_t high;
uint32_t low;
if(*end != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TIME, end-str);
if(*len < 6)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
high = (uint16_t)(t>>32);
low = (uint32_t)(t);
sldns_write_uint16(rd, high);
sldns_write_uint32(rd+2, low);
*len = 6;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_period_buf(const char* str, uint8_t* rd, size_t* len)
{
const char* end;
int overflow;
uint32_t p = sldns_str2period(str, &end, &overflow);
if(*end != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_PERIOD, end-str);
if(overflow)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INTEGER_OVERFLOW,
end-str);
if(*len < 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
sldns_write_uint32(rd, p);
*len = 4;
return LDNS_WIREPARSE_ERR_OK;
}
/** read "<digits>[.<digits>][mM]" into mantissa exponent format for LOC type */
static int
loc_parse_cm(char* my_str, char** endstr, uint8_t* m, uint8_t* e)
{
uint32_t meters = 0, cm = 0, val;
char* cm_endstr;
while (isblank((unsigned char)*my_str)) {
my_str++;
}
meters = (uint32_t)strtol(my_str, &my_str, 10);
if (*my_str == '.') {
my_str++;
cm = (uint32_t)strtol(my_str, &cm_endstr, 10);
if(cm_endstr == my_str + 1)
cm *= 10;
my_str = cm_endstr;
}
if (meters >= 1) {
*e = 2;
val = meters;
} else {
*e = 0;
val = cm;
}
while(val >= 10) {
(*e)++;
val /= 10;
}
*m = (uint8_t)val;
if (*e > 9)
return 0;
if (*my_str == 'm' || *my_str == 'M') {
my_str++;
}
*endstr = my_str;
return 1;
}
int sldns_str2wire_loc_buf(const char* str, uint8_t* rd, size_t* len)
{
uint32_t latitude = 0;
uint32_t longitude = 0;
uint32_t altitude = 0;
uint32_t equator = (uint32_t)1<<31; /* 2**31 */
/* only support version 0 */
uint32_t h = 0;
uint32_t m = 0;
uint8_t size_b = 1, size_e = 2;
uint8_t horiz_pre_b = 1, horiz_pre_e = 6;
uint8_t vert_pre_b = 1, vert_pre_e = 3;
double s = 0.0;
int northerness;
int easterness;
char *my_str = (char *) str;
if (isdigit((unsigned char) *my_str)) {
h = (uint32_t) strtol(my_str, &my_str, 10);
} else {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
while (isblank((unsigned char) *my_str)) {
my_str++;
}
if (isdigit((unsigned char) *my_str)) {
m = (uint32_t) strtol(my_str, &my_str, 10);
} else if (*my_str == 'N' || *my_str == 'S') {
goto north;
} else {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
while (isblank((unsigned char) *my_str)) {
my_str++;
}
if (isdigit((unsigned char) *my_str)) {
s = strtod(my_str, &my_str);
}
/* skip blanks before northerness */
while (isblank((unsigned char) *my_str)) {
my_str++;
}
north:
if (*my_str == 'N') {
northerness = 1;
} else if (*my_str == 'S') {
northerness = 0;
} else {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
my_str++;
/* store number */
s = 1000.0 * s;
/* add a little to make floor in conversion a round */
s += 0.0005;
latitude = (uint32_t) s;
latitude += 1000 * 60 * m;
latitude += 1000 * 60 * 60 * h;
if (northerness) {
latitude = equator + latitude;
} else {
latitude = equator - latitude;
}
while (isblank((unsigned char)*my_str)) {
my_str++;
}
if (isdigit((unsigned char) *my_str)) {
h = (uint32_t) strtol(my_str, &my_str, 10);
} else {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
while (isblank((unsigned char) *my_str)) {
my_str++;
}
if (isdigit((unsigned char) *my_str)) {
m = (uint32_t) strtol(my_str, &my_str, 10);
} else if (*my_str == 'E' || *my_str == 'W') {
goto east;
} else {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
while (isblank((unsigned char)*my_str)) {
my_str++;
}
if (isdigit((unsigned char) *my_str)) {
s = strtod(my_str, &my_str);
}
/* skip blanks before easterness */
while (isblank((unsigned char)*my_str)) {
my_str++;
}
east:
if (*my_str == 'E') {
easterness = 1;
} else if (*my_str == 'W') {
easterness = 0;
} else {
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
my_str++;
/* store number */
s *= 1000.0;
/* add a little to make floor in conversion a round */
s += 0.0005;
longitude = (uint32_t) s;
longitude += 1000 * 60 * m;
longitude += 1000 * 60 * 60 * h;
if (easterness) {
longitude += equator;
} else {
longitude = equator - longitude;
}
altitude = (uint32_t)(strtod(my_str, &my_str)*100.0 +
10000000.0 + 0.5);
if (*my_str == 'm' || *my_str == 'M') {
my_str++;
}
if (strlen(my_str) > 0) {
if(!loc_parse_cm(my_str, &my_str, &size_b, &size_e))
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
if (strlen(my_str) > 0) {
if(!loc_parse_cm(my_str, &my_str, &horiz_pre_b, &horiz_pre_e))
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
if (strlen(my_str) > 0) {
if(!loc_parse_cm(my_str, &my_str, &vert_pre_b, &vert_pre_e))
return LDNS_WIREPARSE_ERR_INVALID_STR;
}
if(*len < 16)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
rd[0] = 0;
rd[1] = ((size_b << 4) & 0xf0) | (size_e & 0x0f);
rd[2] = ((horiz_pre_b << 4) & 0xf0) | (horiz_pre_e & 0x0f);
rd[3] = ((vert_pre_b << 4) & 0xf0) | (vert_pre_e & 0x0f);
sldns_write_uint32(rd + 4, latitude);
sldns_write_uint32(rd + 8, longitude);
sldns_write_uint32(rd + 12, altitude);
*len = 16;
return LDNS_WIREPARSE_ERR_OK;
}
static void
ldns_tolower_str(char* s)
{
if(s) {
while(*s) {
*s = (char)tolower((unsigned char)*s);
s++;
}
}
}
int sldns_str2wire_wks_buf(const char* str, uint8_t* rd, size_t* len)
{
int rd_len = 1;
int have_proto = 0;
char token[50], proto_str[50];
sldns_buffer strbuf;
sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
proto_str[0]=0;
/* check we have one byte for proto */
if(*len < 1)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
while(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) > 0) {
ldns_tolower_str(token);
if(!have_proto) {
struct protoent *p = getprotobyname(token);
have_proto = 1;
if(p) rd[0] = (uint8_t)p->p_proto;
else if(strcasecmp(token, "tcp")==0) rd[0]=6;
else if(strcasecmp(token, "udp")==0) rd[0]=17;
else rd[0] = (uint8_t)atoi(token);
(void)strlcpy(proto_str, token, sizeof(proto_str));
} else {
int serv_port;
if(atoi(token) != 0) serv_port=atoi(token);
else if(strcmp(token, "0") == 0) serv_port=0;
else if(strcasecmp(token, "domain")==0) serv_port=53;
else {
struct servent *serv = getservbyname(token, proto_str);
if(serv) serv_port=(int)ntohs((uint16_t)serv->s_port);
else {
#ifdef HAVE_ENDSERVENT
endservent();
#endif
#ifdef HAVE_ENDPROTOENT
endprotoent();
#endif
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX,
sldns_buffer_position(&strbuf));
}
}
if(serv_port < 0 || serv_port > 65535) {
#ifdef HAVE_ENDSERVENT
endservent();
#endif
#ifdef HAVE_ENDPROTOENT
endprotoent();
#endif
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX,
sldns_buffer_position(&strbuf));
}
if(rd_len < 1+serv_port/8+1) {
/* bitmap is larger, init new bytes at 0 */
if(*len < 1+(size_t)serv_port/8+1) {
#ifdef HAVE_ENDSERVENT
endservent();
#endif
#ifdef HAVE_ENDPROTOENT
endprotoent();
#endif
return RET_ERR(
LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_buffer_position(&strbuf));
}
memset(rd+rd_len, 0, 1+(size_t)serv_port/8+1-rd_len);
rd_len = 1+serv_port/8+1;
}
rd[1+ serv_port/8] |= (1 << (7 - serv_port % 8));
}
}
*len = (size_t)rd_len;
#ifdef HAVE_ENDSERVENT
endservent();
#endif
#ifdef HAVE_ENDPROTOENT
endprotoent();
#endif
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_nsap_buf(const char* str, uint8_t* rd, size_t* len)
{
const char* s = str;
size_t slen;
size_t dlen = 0; /* number of hexdigits parsed */
/* just a hex string with optional dots? */
if (s[0] != '0' || s[1] != 'x')
return LDNS_WIREPARSE_ERR_INVALID_STR;
s += 2;
slen = strlen(s);
if(slen > LDNS_MAX_RDFLEN*2)
return LDNS_WIREPARSE_ERR_LABEL_OVERFLOW;
while(*s) {
if(isspace((unsigned char)*s) || *s == '.') {
s++;
continue;
}
if(!isxdigit((unsigned char)*s))
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
if(*len < dlen/2 + 1)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
s-str);
if((dlen&1)==0)
rd[dlen/2] = (uint8_t)sldns_hexdigit_to_int(*s++) * 16;
else rd[dlen/2] += sldns_hexdigit_to_int(*s++);
dlen++;
}
if((dlen&1)!=0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
*len = dlen/2;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_atma_buf(const char* str, uint8_t* rd, size_t* len)
{
const char* s = str;
size_t slen = strlen(str);
size_t dlen = 0; /* number of hexdigits parsed */
/* just a hex string with optional dots? */
/* notimpl e.164 format */
if(slen > LDNS_MAX_RDFLEN*2)
return LDNS_WIREPARSE_ERR_LABEL_OVERFLOW;
while(*s) {
if(isspace((unsigned char)*s) || *s == '.') {
s++;
continue;
}
if(!isxdigit((unsigned char)*s))
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
if(*len < dlen/2 + 1)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
s-str);
if((dlen&1)==0)
rd[dlen/2] = (uint8_t)sldns_hexdigit_to_int(*s++) * 16;
else rd[dlen/2] += sldns_hexdigit_to_int(*s++);
dlen++;
}
if((dlen&1)!=0)
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, s-str);
*len = dlen/2;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_ipseckey_buf(const char* str, uint8_t* rd, size_t* len)
{
size_t gwlen = 0, keylen = 0;
int s;
uint8_t gwtype;
char token[512];
sldns_buffer strbuf;
sldns_buffer_init_frm_data(&strbuf, (uint8_t*)str, strlen(str));
if(*len < 3)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
/* precedence */
if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
sldns_buffer_position(&strbuf));
rd[0] = (uint8_t)atoi(token);
/* gateway_type */
if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
sldns_buffer_position(&strbuf));
rd[1] = (uint8_t)atoi(token);
gwtype = rd[1];
/* algorithm */
if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
sldns_buffer_position(&strbuf));
rd[2] = (uint8_t)atoi(token);
/* gateway */
if(sldns_bget_token(&strbuf, token, "\t\n ", sizeof(token)) <= 0)
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
sldns_buffer_position(&strbuf));
if(gwtype == 0) {
/* NOGATEWAY */
if(strcmp(token, ".") != 0)
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
sldns_buffer_position(&strbuf));
gwlen = 0;
} else if(gwtype == 1) {
/* IP4 */
gwlen = *len - 3;
s = sldns_str2wire_a_buf(token, rd+3, &gwlen);
if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
} else if(gwtype == 2) {
/* IP6 */
gwlen = *len - 3;
s = sldns_str2wire_aaaa_buf(token, rd+3, &gwlen);
if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
} else if(gwtype == 3) {
/* DNAME */
gwlen = *len - 3;
s = sldns_str2wire_dname_buf(token, rd+3, &gwlen);
if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
} else {
/* unknown gateway type */
return RET_ERR(LDNS_WIREPARSE_ERR_INVALID_STR,
sldns_buffer_position(&strbuf));
}
/* double check for size */
if(*len < 3 + gwlen)
return RET_ERR(LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL,
sldns_buffer_position(&strbuf));
/* publickey in remainder of strbuf */
keylen = *len - 3 - gwlen;
s = sldns_str2wire_b64_buf((const char*)sldns_buffer_current(&strbuf),
rd+3+gwlen, &keylen);
if(s) return RET_ERR_SHIFT(s, sldns_buffer_position(&strbuf));
*len = 3 + gwlen + keylen;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_nsec3_salt_buf(const char* str, uint8_t* rd, size_t* len)
{
int i, salt_length_str = (int)strlen(str);
if (salt_length_str == 1 && str[0] == '-') {
salt_length_str = 0;
} else if (salt_length_str % 2 != 0) {
return LDNS_WIREPARSE_ERR_SYNTAX_HEX;
}
if (salt_length_str > 512)
return LDNS_WIREPARSE_ERR_SYNTAX_HEX;
if(*len < 1+(size_t)salt_length_str / 2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
rd[0] = (uint8_t) (salt_length_str / 2);
for (i = 0; i < salt_length_str; i += 2) {
if (isxdigit((unsigned char)str[i]) &&
isxdigit((unsigned char)str[i+1])) {
rd[1+i/2] = (uint8_t)(sldns_hexdigit_to_int(str[i])*16
+ sldns_hexdigit_to_int(str[i+1]));
} else {
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_HEX, i);
}
}
*len = 1 + (size_t)rd[0];
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_ilnp64_buf(const char* str, uint8_t* rd, size_t* len)
{
unsigned int a, b, c, d;
uint16_t shorts[4];
int l;
if(*len < sizeof(shorts))
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if (sscanf(str, "%4x:%4x:%4x:%4x%n", &a, &b, &c, &d, &l) != 4 ||
l != (int)strlen(str) || /* more data to read */
strpbrk(str, "+-") /* signed hexes */
)
return LDNS_WIREPARSE_ERR_SYNTAX_ILNP64;
shorts[0] = htons(a);
shorts[1] = htons(b);
shorts[2] = htons(c);
shorts[3] = htons(d);
memmove(rd, &shorts, sizeof(shorts));
*len = sizeof(shorts);
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_eui48_buf(const char* str, uint8_t* rd, size_t* len)
{
unsigned int a, b, c, d, e, f;
int l;
if(*len < 6)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if (sscanf(str, "%2x-%2x-%2x-%2x-%2x-%2x%n",
&a, &b, &c, &d, &e, &f, &l) != 6 ||
l != (int)strlen(str))
return LDNS_WIREPARSE_ERR_SYNTAX_EUI48;
rd[0] = a;
rd[1] = b;
rd[2] = c;
rd[3] = d;
rd[4] = e;
rd[5] = f;
*len = 6;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_eui64_buf(const char* str, uint8_t* rd, size_t* len)
{
unsigned int a, b, c, d, e, f, g, h;
int l;
if(*len < 8)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if (sscanf(str, "%2x-%2x-%2x-%2x-%2x-%2x-%2x-%2x%n",
&a, &b, &c, &d, &e, &f, &g, &h, &l) != 8 ||
l != (int)strlen(str))
return LDNS_WIREPARSE_ERR_SYNTAX_EUI64;
rd[0] = a;
rd[1] = b;
rd[2] = c;
rd[3] = d;
rd[4] = e;
rd[5] = f;
rd[6] = g;
rd[7] = h;
*len = 8;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_tag_buf(const char* str, uint8_t* rd, size_t* len)
{
size_t slen = strlen(str);
const char* ptr;
if (slen > 255)
return LDNS_WIREPARSE_ERR_SYNTAX_TAG;
if(*len < slen+1)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
for (ptr = str; *ptr; ptr++) {
if(!isalnum((unsigned char)*ptr))
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_TAG, ptr-str);
}
rd[0] = (uint8_t)slen;
memmove(rd+1, str, slen);
*len = slen+1;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_long_str_buf(const char* str, uint8_t* rd, size_t* len)
{
uint8_t ch = 0;
const char* pstr = str;
size_t length = 0;
/* Fill data with parsed bytes */
while (sldns_parse_char(&ch, &pstr)) {
if(*len < length+1)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
rd[length++] = ch;
}
if(!pstr)
return LDNS_WIREPARSE_ERR_SYNTAX_BAD_ESCAPE;
*len = length;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_hip_buf(const char* str, uint8_t* rd, size_t* len)
{
char* s, *end;
int e;
size_t hitlen, pklen = 0;
/* presentation format:
* pk-algo HIThex pubkeybase64
* wireformat:
* hitlen[1byte] pkalgo[1byte] pubkeylen[2byte] [hit] [pubkey] */
if(*len < 4)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
/* read PK algorithm */
rd[1] = (uint8_t)strtol((char*)str, &s, 10);
if(*s != ' ')
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, s-(char*)str);
s++;
while(*s == ' ')
s++;
/* read HIT hex tag */
/* zero terminate the tag (replace later) */
end = strchr(s, ' ');
if(!end) return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX, s-(char*)str);
*end = 0;
hitlen = *len - 4;
if((e = sldns_str2wire_hex_buf(s, rd+4, &hitlen)) != 0) {
*end = ' ';
return RET_ERR_SHIFT(e, s-(char*)str);
}
if(hitlen > 255) {
*end = ' ';
return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, s-(char*)str+255*2);
}
rd[0] = (uint8_t)hitlen;
*end = ' ';
s = end+1;
/* read pubkey base64 sequence */
pklen = *len - 4 - hitlen;
if((e = sldns_str2wire_b64_buf(s, rd+4+hitlen, &pklen)) != 0)
return RET_ERR_SHIFT(e, s-(char*)str);
if(pklen > 65535)
return RET_ERR(LDNS_WIREPARSE_ERR_LABEL_OVERFLOW, s-(char*)str+65535);
sldns_write_uint16(rd+2, (uint16_t)pklen);
*len = 4 + hitlen + pklen;
return LDNS_WIREPARSE_ERR_OK;
}
int sldns_str2wire_int16_data_buf(const char* str, uint8_t* rd, size_t* len)
{
char* s;
int n;
n = strtol(str, &s, 10);
if(n < 0) /* negative number not allowed */
return LDNS_WIREPARSE_ERR_SYNTAX;
if(*len < ((size_t)n)+2)
return LDNS_WIREPARSE_ERR_BUFFER_TOO_SMALL;
if(n > 65535)
return LDNS_WIREPARSE_ERR_LABEL_OVERFLOW;
if(n == 0) {
sldns_write_uint16(rd, 0);
*len = 2;
return LDNS_WIREPARSE_ERR_OK;
}
if(*s != ' ')
return RET_ERR(LDNS_WIREPARSE_ERR_SYNTAX_INT, s-(char*)str);
s++;
while(*s == ' ')
s++;
n = sldns_b64_pton(s, rd+2, (*len)-2);
if(n < 0)
return LDNS_WIREPARSE_ERR_SYNTAX_B64;
sldns_write_uint16(rd, (uint16_t)n);
*len = ((size_t)n)+2;
return LDNS_WIREPARSE_ERR_OK;
}
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