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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <string>
#include "dnsname.hh"
#include "namespaces.hh"
#include "dnswriter.hh"
#include "misc.hh"
namespace {
void appendSplit(vector<string>& ret, string& segment, char c)
{
if(segment.size()>254) {
ret.push_back(segment);
segment.clear();
}
segment.append(1, c);
}
}
vector<string> segmentDNSText(const string& input )
{
// cerr<<"segmentDNSText("<<input<<")"<<endl;
%%{
machine dnstext;
write data;
alphtype unsigned char;
}%%
(void)dnstext_error; // silence warnings
(void)dnstext_en_main;
const char *p = input.c_str(), *pe = input.c_str() + input.length();
const char* eof = pe;
int cs;
char val = 0;
string segment;
vector<string> ret;
%%{
action segmentEnd {
ret.push_back(segment);
segment.clear();
}
action segmentBegin {
segment.clear();
}
action reportEscaped {
char c = *fpc;
appendSplit(ret, segment, c);
}
action reportEscapedNumber {
char c = *fpc;
val *= 10;
val += c-'0';
}
action doneEscapedNumber {
appendSplit(ret, segment, val);
val=0;
}
action reportPlain {
appendSplit(ret, segment, *(fpc));
}
escaped = '\\' (([^0-9]@reportEscaped) | ([0-9]{3}$reportEscapedNumber%doneEscapedNumber));
plain = ((extend-'\\'-'"')|'\n'|'\t') $ reportPlain;
txtElement = escaped | plain;
main := (('"' txtElement* '"' space?) >segmentBegin %segmentEnd)+;
# Initialize and execute.
write init;
write exec;
}%%
if ( cs < dnstext_first_final ) {
throw runtime_error("Unable to parse DNS TXT '"+input+"'");
}
return ret;
};
DNSName::string_t segmentDNSNameRaw(const char* realinput, size_t inputlen)
{
%%{
machine dnsnameraw;
write data;
alphtype unsigned char;
}%%
(void)dnsnameraw_error; // silence warnings
(void)dnsnameraw_en_main;
DNSName::string_t ret;
if(!*realinput || *realinput == '.') {
ret.append(1, (char)0);
return ret;
}
ret.reserve(inputlen+1);
const char *p = realinput, *pe = realinput + inputlen;
const char* eof = pe;
int cs;
char val = 0;
char labellen=0;
unsigned int lenpos=0;
%%{
action labelEnd {
if (labellen < 0 || labellen > 63) {
throw runtime_error("Unable to parse DNS name '"+string(realinput)+"': invalid label length "+std::to_string(labellen));
}
ret[lenpos]=labellen;
labellen=0;
}
action labelBegin {
lenpos=ret.size();
ret.append(1, (char)0);
labellen=0;
}
action reportEscaped {
char c = *fpc;
ret.append(1, c);
labellen++;
}
action reportEscapedNumber {
char c = *fpc;
val *= 10;
val += c-'0';
}
action doneEscapedNumber {
ret.append(1, val);
labellen++;
val=0;
}
action reportPlain {
ret.append(1, *(fpc));
labellen++;
}
escaped = '\\' (([^0-9]@reportEscaped) | ([0-9]{3}$reportEscapedNumber%doneEscapedNumber));
plain = (extend-'\\'-'.') $ reportPlain;
labelElement = escaped | plain;
label = labelElement+ >labelBegin %labelEnd;
main:= label ('.' label )* '.'?;
#main := labelElement((labelElement+ '.') >labelBegin %labelEnd)+;
# label = (plain | escaped | escdecb)+ >label_init %label_fin;
# dnsname := '.'? label ('.' label >label_sep)* '.'?;
# Initialize and execute.
write init;
write exec;
}%%
if ( cs < dnsnameraw_first_final ) {
throw runtime_error("Unable to parse DNS name '"+string(realinput)+"': cs="+std::to_string(cs));
}
ret.append(1, (char)0);
return ret;
};
// Reads an RFC 1035 character string from 'in', puts the resulting bytes in 'out'.
// Returns the amount of bytes read from 'in'
size_t parseRFC1035CharString(const std::string &in, std::string &val) {
val.clear();
val.reserve(in.size());
const char *p = in.c_str();
const char *pe = p + in.size();
int cs = 0;
uint8_t escaped_octet = 0;
// Keeps track of how many chars we read from the source string
size_t counter=0;
/* This parses an RFC 1035 char-string.
* It was created from the ABNF in draft-ietf-dnsop-svcb-https-02 with
* https://github.com/zinid/abnfc and modified to put all the characters in the
* right place.
*/
%%{
machine dns_text_to_string;
action doEscapedNumber {
escaped_octet *= 10;
escaped_octet += fc-'0';
counter++;
}
action doneEscapedNumber {
val += escaped_octet;
escaped_octet = 0;
}
action addToVal {
val += fc;
counter++;
}
action incrementCounter {
counter++;
}
# generated rules, define required actions
DIGIT = 0x30..0x39;
DQUOTE = "\"";
HTAB = "\t";
SP = " ";
WSP = (SP | HTAB)@addToVal;
non_special = "!" | 0x23..0x27 | 0x2a..0x3a | 0x3c..0x5b | 0x5d..0x7e;
non_digit = 0x21..0x2f | 0x3a..0x7e;
dec_octet = ( ( "0" | "1" ) DIGIT{2} ) | ( "2" ( ( 0x30..0x34 DIGIT ) | ( "5" 0x30..0x35 ) ) );
escaped = '\\'@incrementCounter ( non_digit$addToVal | dec_octet$doEscapedNumber@doneEscapedNumber );
contiguous = ( non_special$addToVal | escaped )+;
quoted = DQUOTE@incrementCounter ( contiguous | ( '\\'? WSP ) )* DQUOTE@incrementCounter;
char_string = (contiguous | quoted);
# instantiate machine rules
main := char_string;
write data;
write init;
}%%
// silence warnings
(void) dns_text_to_string_first_final;
(void) dns_text_to_string_error;
(void) dns_text_to_string_en_main;
%% write exec;
return counter;
}
size_t parseSVCBValueListFromParsedRFC1035CharString(const std::string &in, std::vector<std::string> &val) {
val.clear();
const char *p = in.c_str();
const char *pe = p + in.size();
int cs = 0;
const char* eof = pe;
// Keeps track of how many chars we read from the source string
size_t counter=0;
// Here we store the parsed value until we hit a comma or are done
std::string tmp;
%%{
machine dns_text_to_value_list;
alphtype unsigned char;
action addToVal {
tmp += fc;
counter++;
}
action addToValNoIncrement {
tmp += fc;
}
action addToVector {
val.push_back(tmp);
tmp.clear();
counter++;
}
action incrementCounter {
counter++;
}
# generated rules, define required actions
OCTET = 0x00..0xff;
item_allowed = 0x00..0x2b | 0x2d..0x5b | 0x5d..0xff;
escaped_item = ( item_allowed$addToVal | '\\,'$incrementCounter@addToValNoIncrement | '\\\\'$incrementCounter@addToValNoIncrement )+;
comma_separated = ( escaped_item%addToVector ( ","@incrementCounter escaped_item%addToVector )* )?;
# instantiate machine rules
main := comma_separated;
write data;
write init;
}%%
// silence warnings
(void) dns_text_to_value_list_first_final;
(void) dns_text_to_value_list_error;
(void) dns_text_to_value_list_en_main;
%% write exec;
if ( cs < dns_text_to_value_list_first_final ) {
throw runtime_error("Unable to parse DNS SVCB value list '"+in+"'");
}
return counter;
}
#if 0
int main()
{
//char blah[]="\"blah\" \"bleh\" \"bloeh\\\"bleh\" \"\\97enzo\"";
char blah[]="\"v=spf1 ip4:67.106.74.128/25 ip4:63.138.42.224/28 ip4:65.204.46.224/27 \\013\\010ip4:66.104.217.176/28 \\013\\010ip4:209.48.147.0/27 ~all\"";
//char blah[]="\"abc \\097\\098 def\"";
printf("Input: '%s'\n", blah);
vector<string> res=dnstext(blah);
cerr<<res.size()<<" segments"<<endl;
cerr<<res[0]<<endl;
}
#endif
(void)dnstext_error; // silence warnings
(void)dnstext_en_main;
const char *p = input.c_str(), *pe = input.c_str() + input.length();
const char* eof = pe;
int cs;
char val = 0;
string segment;
vector<string> ret;
ret.push_back(segment);
segment.clear();
segment.clear();
char c = *fpc;
appendSplit(ret, segment, c);
char c = *fpc;
val *= 10;
val += c-'0';
appendSplit(ret, segment, val);
val=0;
appendSplit(ret, segment, *(fpc));
3
if ( cs < dnstext_first_final ) {
throw runtime_error("Unable to parse DNS TXT '"+input+"'");
}
return ret;
};
DNSName::string_t segmentDNSNameRaw(const char* realinput, size_t inputlen)
{
(void)dnsnameraw_error; // silence warnings
(void)dnsnameraw_en_main;
DNSName::string_t ret;
if(!*realinput || *realinput == '.') {
ret.append(1, (char)0);
return ret;
}
ret.reserve(inputlen+1);
const char *p = realinput, *pe = realinput + inputlen;
const char* eof = pe;
int cs;
char val = 0;
char labellen=0;
unsigned int lenpos=0;
if (labellen < 0 || labellen > 63)
throw runtime_error("Unable to parse DNS name '"+string(realinput)+"': invalid label length "+std::to_string(labellen));
ret[lenpos]=labellen;
labellen=0;
lenpos=ret.size();
ret.append(1, (char)0);
labellen=0;
char c = *fpc;
ret.append(1, c);
labellen++;
char c = *fpc;
val *= 10;
val += c-'0';
ret.append(1, val);
labellen++;
val=0;
ret.append(1, *(fpc));
labellen++;
3
if ( cs < dnsnameraw_first_final ) {
throw runtime_error("Unable to parse DNS name '"+string(realinput)+"': cs="+std::to_string(cs));
}
ret.append(1, (char)0);
return ret;
};
// Reads an RFC 1035 character string from 'in', puts the resulting bytes in 'out'.
// Returns the amount of bytes read from 'in'
size_t parseRFC1035CharString(const std::string &in, std::string &val) {
val.clear();
val.reserve(in.size());
const char *p = in.c_str();
const char *pe = p + in.size();
int cs = 0;
uint8_t escaped_octet = 0;
// Keeps track of how many chars we read from the source string
size_t counter=0;
/* This parses an RFC 1035 char-string.
* It was created from the ABNF in draft-ietf-dnsop-svcb-https-02 with
* https://github.com/zinid/abnfc and modified to put all the characters in the
* right place.
*/
escaped_octet *= 10;
escaped_octet += fc-'0';
counter++;
val += escaped_octet;
escaped_octet = 0;
val += fc;
counter++;
counter++;
2
// silence warnings
(void) dns_text_to_string_first_final;
(void) dns_text_to_string_error;
(void) dns_text_to_string_en_main;
return counter;
}
size_t parseSVCBValueListFromParsedRFC1035CharString(const std::string &in, std::vector<std::string> &val) {
val.clear();
const char *p = in.c_str();
const char *pe = p + in.size();
int cs = 0;
const char* eof = pe;
// Keeps track of how many chars we read from the source string
size_t counter=0;
// Here we store the parsed value until we hit a comma or are done
std::string tmp;
tmp += fc;
counter++;
tmp += fc;
val.push_back(tmp);
tmp.clear();
counter++;
counter++;
// silence warnings
(void) dns_text_to_value_list_first_final;
(void) dns_text_to_value_list_error;
(void) dns_text_to_value_list_en_main;
if ( cs < dns_text_to_value_list_first_final ) {
throw runtime_error("Unable to parse DNS SVCB value list '"+in+"'");
}
return counter;
}
#if 0
int main()
{
//char blah[]="\"blah\" \"bleh\" \"bloeh\\\"bleh\" \"\\97enzo\"";
char blah[]="\"v=spf1 ip4:67.106.74.128/25 ip4:63.138.42.224/28 ip4:65.204.46.224/27 \\013\\010ip4:66.104.217.176/28 \\013\\010ip4:209.48.147.0/27 ~all\"";
//char blah[]="\"abc \\097\\098 def\"";
printf("Input: '%s'\n", blah);
vector<string> res=dnstext(blah);
cerr<<res.size()<<" segments"<<endl;
cerr<<res[0]<<endl;
}
#endif
(void)dnstext_error; // silence warnings
(void)dnstext_en_main;
const char *p = input.c_str(), *pe = input.c_str() + input.length();
const char* eof = pe;
int cs;
char val = 0;
string segment;
vector<string> ret;
ret.push_back(segment);
segment.clear();
segment.clear();
char c = *fpc;
appendSplit(ret, segment, c);
char c = *fpc;
val *= 10;
val += c-'0';
appendSplit(ret, segment, val);
val=0;
appendSplit(ret, segment, *(fpc));
3
if ( cs < dnstext_first_final ) {
throw runtime_error("Unable to parse DNS TXT '"+input+"'");
}
return ret;
};
DNSName::string_t segmentDNSNameRaw(const char* realinput, size_t inputlen)
{
(void)dnsnameraw_error; // silence warnings
(void)dnsnameraw_en_main;
DNSName::string_t ret;
if(!*realinput || *realinput == '.') {
ret.append(1, (char)0);
return ret;
}
ret.reserve(inputlen+1);
const char *p = realinput, *pe = realinput + inputlen;
const char* eof = pe;
int cs;
char val = 0;
char labellen=0;
unsigned int lenpos=0;
if (labellen < 0 || labellen > 63)
throw runtime_error("Unable to parse DNS name '"+string(realinput)+"': invalid label length "+std::to_string(labellen));
ret[lenpos]=labellen;
labellen=0;
lenpos=ret.size();
ret.append(1, (char)0);
labellen=0;
char c = *fpc;
ret.append(1, c);
labellen++;
char c = *fpc;
val *= 10;
val += c-'0';
ret.append(1, val);
labellen++;
val=0;
ret.append(1, *(fpc));
labellen++;
3
if ( cs < dnsnameraw_first_final ) {
throw runtime_error("Unable to parse DNS name '"+string(realinput)+"': cs="+std::to_string(cs));
}
ret.append(1, (char)0);
return ret;
};
// Reads an RFC 1035 character string from 'in', puts the resulting bytes in 'out'.
// Returns the amount of bytes read from 'in'
size_t parseRFC1035CharString(const std::string &in, std::string &val) {
val.clear();
val.reserve(in.size());
const char *p = in.c_str();
const char *pe = p + in.size();
int cs = 0;
uint8_t escaped_octet = 0;
// Keeps track of how many chars we read from the source string
size_t counter=0;
/* This parses an RFC 1035 char-string.
* It was created from the ABNF in draft-ietf-dnsop-svcb-https-02 with
* https://github.com/zinid/abnfc and modified to put all the characters in the
* right place.
*/
escaped_octet *= 10;
escaped_octet += fc-'0';
counter++;
val += escaped_octet;
escaped_octet = 0;
val += fc;
counter++;
counter++;
2
// silence warnings
(void) dns_text_to_string_first_final;
(void) dns_text_to_string_error;
(void) dns_text_to_string_en_main;
return counter;
}
size_t parseSVCBValueListFromParsedRFC1035CharString(const std::string &in, std::vector<std::string> &val) {
val.clear();
const char *p = in.c_str();
const char *pe = p + in.size();
int cs = 0;
const char* eof = pe;
// Keeps track of how many chars we read from the source string
size_t counter=0;
// Here we store the parsed value until we hit a comma or are done
std::string tmp;
tmp += fc;
counter++;
tmp += fc;
val.push_back(tmp);
tmp.clear();
counter++;
counter++;
// silence warnings
(void) dns_text_to_value_list_first_final;
(void) dns_text_to_value_list_error;
(void) dns_text_to_value_list_en_main;
if ( cs < dns_text_to_value_list_first_final ) {
throw runtime_error("Unable to parse DNS SVCB value list '"+in+"'");
}
return counter;
}
#if 0
int main()
{
//char blah[]="\"blah\" \"bleh\" \"bloeh\\\"bleh\" \"\\97enzo\"";
char blah[]="\"v=spf1 ip4:67.106.74.128/25 ip4:63.138.42.224/28 ip4:65.204.46.224/27 \\013\\010ip4:66.104.217.176/28 \\013\\010ip4:209.48.147.0/27 ~all\"";
//char blah[]="\"abc \\097\\098 def\"";
printf("Input: '%s'\n", blah);
vector<string> res=dnstext(blah);
cerr<<res.size()<<" segments"<<endl;
cerr<<res[0]<<endl;
}
#endif
cerr<<res[0]<<endl;
}
#endif
}
#endif
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