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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <string>
#include "dnsname.hh"
#include "namespaces.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)
{
%%{
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;
}
unsigned int inputlen=strlen(realinput);
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;
};
#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
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