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640 lines
19 KiB
C++
640 lines
19 KiB
C++
#include <dnsd.hpp> // for llarp_handle_dnsd_recvfrom, dnsc
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#include <endian.hpp>
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#include <logger.hpp>
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void
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hexDump(const char *buffer, uint16_t size)
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{
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// would rather heap allocate than use VLA
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char *hex_buffer = new char[size * 3 + 1];
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hex_buffer[size * 3] = 0;
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for(unsigned int j = 0; j < size; j++)
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sprintf(&hex_buffer[3 * j], "%02X ", buffer[j]);
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std::string str(hex_buffer);
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llarp::LogInfo("First ", size, " bytes: ", str);
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delete[] hex_buffer;
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}
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void
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hexDumpAt(const char *const buffer, uint32_t pos, uint16_t size)
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{
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// would rather heap allocate than use VLA
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char *hex_buffer = new char[size * 3 + 1];
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hex_buffer[size * 3] = 0;
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for(unsigned int j = 0; j < size; j++)
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sprintf(&hex_buffer[3 * j], "%02X ", buffer[pos + j]);
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std::string str(hex_buffer);
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llarp::LogInfo(pos, " ", size, " bytes: ", str);
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delete[] hex_buffer;
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}
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/*
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<domain-name> is a domain name represented as a series of labels, and
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terminated by a label with zero length. <character-string> is a single
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length octet followed by that number of characters. <character-string>
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is treated as binary information, and can be up to 256 characters in
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length (including the length octet).
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*/
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std::string
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getDNSstring(const char *const buffer, uint32_t *pos)
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{
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std::string str = "";
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const char *moveable = buffer;
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moveable += *pos;
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uint8_t length = *moveable++;
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(*pos)++;
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if(length == 0xc0)
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{
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uint8_t cPos = *moveable++;
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(*pos)++;
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uint32_t cPos32 = cPos;
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// llarp::LogInfo("Found reference at ", std::to_string(cPos));
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return getDNSstring(buffer, &cPos32);
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}
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// hexDump(moveable, length);
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// hexDump(buffer, length);
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// printf("dnsStringLen[%d]\n", length);
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// llarp::LogInfo("dnsStringLen ", std::to_string(length));
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if(!length)
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return str;
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while(length != 0)
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{
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// llarp::LogInfo("Reading ", std::to_string(length));
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for(int i = 0; i < length; i++)
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{
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char c = *moveable++;
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(*pos)++;
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str.append(1, c);
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}
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if(*moveable == '\xc0')
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{
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moveable++;
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(*pos)++; // forward one char
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uint8_t cPos = *moveable; // read char
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uint32_t cPos32 = cPos;
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// llarp::LogInfo("Remaining [", str, "] is an reference at ", (int)cPos);
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std::string addl = getDNSstring(buffer, &cPos32);
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// llarp::LogInfo("Addl str [", addl, "]");
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str += "." + addl;
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// llarp::LogInfo("Final str [", str, "]");
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(*pos)++; // move past reference
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return str;
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}
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length = *moveable++;
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(*pos)++;
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if(length > 64)
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llarp::LogError("bug detected");
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// else
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// hexDump(buffer, length);
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// llarp::LogInfo("NextLen ", std::to_string(length));
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if(length != 0)
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str.append(1, '.');
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}
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// llarp::LogInfo("Returning ", str);
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return str;
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}
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void
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code_domain(char *&buffer, const std::string &domain) throw()
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{
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std::string::size_type start(0);
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std::string::size_type end; // indexes
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// llarp::LogInfo("domain [", domain, "]");
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while((end = domain.find('.', start)) != std::string::npos)
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{
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*buffer++ = end - start; // label length octet
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for(std::string::size_type i = start; i < end; i++)
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{
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*buffer++ = domain[i]; // label octets
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// llarp::LogInfo("Writing ", domain[i], " at ", i);
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}
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start = end + 1; // Skip '.'
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}
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// llarp::LogInfo("start ", start, " domain size ", domain.size());
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*buffer++ = domain.size() - start; // last label length octet
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for(size_t i = start; i < domain.size(); i++)
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{
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*buffer++ = domain[i]; // last label octets
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// llarp::LogInfo("Writing ", domain[i], " at ", i);
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}
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*buffer++ = 0;
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}
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void
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vcode_domain(std::vector< byte_t > &bytes, const std::string &domain) throw()
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{
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std::string::size_type start(0);
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std::string::size_type end; // indexes
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// llarp::LogInfo("domain [", domain, "]");
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while((end = domain.find('.', start)) != std::string::npos)
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{
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bytes.push_back(end - start); // label length octet
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for(std::string::size_type i = start; i < end; i++)
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{
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bytes.push_back(domain[i]); // label octets
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// llarp::LogInfo("Writing ", domain[i], " at ", i);
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}
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start = end + 1; // Skip '.'
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}
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// llarp::LogInfo("start ", start, " domain size ", domain.size());
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bytes.push_back(domain.size() - start); // last label length octet
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for(size_t i = start; i < domain.size(); i++)
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{
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bytes.push_back(domain[i]); // last label octets
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// llarp::LogInfo("Writing ", domain[i], " at ", i);
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}
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bytes.push_back(0); // end it
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}
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// expects host order
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void
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vput16bits(std::vector< byte_t > &bytes, uint16_t value) throw()
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{
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char buf[2] = {0};
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char *write_buffer = buf;
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htobe16buf(write_buffer, value);
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bytes.push_back(buf[0]);
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bytes.push_back(buf[1]);
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}
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// expects host order
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void
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vput32bits(std::vector< byte_t > &bytes, uint32_t value) throw()
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{
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char buf[4] = {0};
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char *write_buffer = buf;
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htobe32buf(write_buffer, value);
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bytes.push_back(buf[0]);
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bytes.push_back(buf[1]);
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bytes.push_back(buf[2]);
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bytes.push_back(buf[3]);
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}
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void
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dns_writeType(std::vector< byte_t > &bytes, llarp::dns::record *record)
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{
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llarp::dns::type_1a *type1a = dynamic_cast< llarp::dns::type_1a * >(record);
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if(type1a)
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{
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std::vector< byte_t > more_bytes = type1a->to_bytes();
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llarp::LogDebug("[1]Adding ", more_bytes.size());
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bytes.insert(bytes.end(), more_bytes.begin(), more_bytes.end());
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}
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llarp::dns::type_2ns *type2ns =
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dynamic_cast< llarp::dns::type_2ns * >(record);
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if(type2ns)
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{
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std::vector< byte_t > more_bytes = type2ns->to_bytes();
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llarp::LogDebug("[2]Adding ", more_bytes.size());
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bytes.insert(bytes.end(), more_bytes.begin(), more_bytes.end());
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}
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llarp::dns::type_5cname *type5cname =
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dynamic_cast< llarp::dns::type_5cname * >(record);
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if(type5cname)
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{
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std::vector< byte_t > more_bytes = type5cname->to_bytes();
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llarp::LogDebug("[5]Adding ", more_bytes.size());
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bytes.insert(bytes.end(), more_bytes.begin(), more_bytes.end());
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}
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llarp::dns::type_12ptr *type12ptr =
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dynamic_cast< llarp::dns::type_12ptr * >(record);
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if(type12ptr)
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{
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std::vector< byte_t > more_bytes = type12ptr->to_bytes();
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llarp::LogDebug("[12]Adding ", more_bytes.size());
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bytes.insert(bytes.end(), more_bytes.begin(), more_bytes.end());
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}
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llarp::dns::type_15mx *type15mx =
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dynamic_cast< llarp::dns::type_15mx * >(record);
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if(type15mx)
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{
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std::vector< byte_t > more_bytes = type15mx->to_bytes();
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llarp::LogDebug("[15]Adding ", more_bytes.size());
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bytes.insert(bytes.end(), more_bytes.begin(), more_bytes.end());
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}
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llarp::dns::type_16txt *type16txt =
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dynamic_cast< llarp::dns::type_16txt * >(record);
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if(type16txt)
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{
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std::vector< byte_t > more_bytes = type16txt->to_bytes();
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llarp::LogDebug("[15]Adding ", more_bytes.size());
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bytes.insert(bytes.end(), more_bytes.begin(), more_bytes.end());
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}
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}
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std::vector< byte_t >
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packet2bytes(dns_packet &in)
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{
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std::vector< byte_t > write_buffer;
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vput16bits(write_buffer, in.header.id);
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int fields = (in.header.qr << 15); // QR => message type, 1 = response
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fields += (in.header.opcode << 14); // I think opcode is always 0
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fields += in.header.rcode; // response code (3 => not found, 0 = Ok)
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vput16bits(write_buffer, fields);
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// don't pull these from the header, trust what we actually have more
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vput16bits(write_buffer, in.questions.size()); // QD (number of questions)
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vput16bits(write_buffer, in.answers.size()); // AN (number of answers)
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vput16bits(write_buffer, in.auth_rrs.size()); // NS (number of auth RRs)
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vput16bits(write_buffer,
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in.additional_rrs.size()); // AR (number of Additional RRs)
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for(auto &it : in.questions)
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{
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// code question
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vcode_domain(write_buffer, it->name);
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vput16bits(write_buffer, it->type);
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vput16bits(write_buffer, it->qClass);
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}
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for(auto &it : in.answers)
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{
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// code answers
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vcode_domain(write_buffer, it->name);
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vput16bits(write_buffer, it->type);
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vput16bits(write_buffer, it->aClass);
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vput32bits(write_buffer, 1); // ttl
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dns_writeType(write_buffer, it->record.get());
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}
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for(auto &it : in.auth_rrs)
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{
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// code answers
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vcode_domain(write_buffer, it->name);
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vput16bits(write_buffer, it->type);
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vput16bits(write_buffer, it->aClass);
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vput32bits(write_buffer, 1); // ttl
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dns_writeType(write_buffer, it->record.get());
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}
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for(auto &it : in.additional_rrs)
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{
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// code answers
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vcode_domain(write_buffer, it->name);
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vput16bits(write_buffer, it->type);
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vput16bits(write_buffer, it->aClass);
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vput32bits(write_buffer, 1); // ttl
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dns_writeType(write_buffer, it->record.get());
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}
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return write_buffer;
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}
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extern "C"
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{
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uint16_t
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get16bits(const char *&buffer) throw()
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{
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uint16_t value = bufbe16toh(buffer);
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buffer += 2;
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return value;
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}
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uint32_t
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get32bits(const char *&buffer) throw()
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{
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uint32_t value = bufbe32toh(buffer);
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buffer += 4;
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return value;
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}
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bool
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decode_hdr(llarp_buffer_t *buffer, dns_msg_header *hdr)
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{
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uint16_t fields;
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// reads as HOST byte order
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if(!llarp_buffer_read_uint16(buffer, &hdr->id))
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return false;
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if(!llarp_buffer_read_uint16(buffer, &fields))
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return false;
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if(!llarp_buffer_read_uint16(buffer, &hdr->qdCount))
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return false;
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if(!llarp_buffer_read_uint16(buffer, &hdr->anCount))
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return false;
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if(!llarp_buffer_read_uint16(buffer, &hdr->nsCount))
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return false;
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if(!llarp_buffer_read_uint16(buffer, &hdr->arCount))
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return false;
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// decode fields into hdr
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uint8_t lFields = (fields & 0x00FF) >> 0;
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uint8_t hFields = (fields & 0xFF00) >> 8;
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// process high byte
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// hdr->qr = fields & 0x8000;
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hdr->qr = (hFields >> 7) & 0x1;
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hdr->opcode = fields & 0x7800;
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hdr->aa = fields & 0x0400;
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hdr->tc = fields & 0x0200;
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hdr->rd = fields & 0x0100;
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// process low byte
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hdr->ra = (lFields >> 7) & 0x1;
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hdr->z = (lFields >> 6) & 0x1;
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hdr->ad = (lFields >> 5) & 0x1;
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hdr->cd = (lFields >> 4) & 0x1;
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hdr->rcode = lFields & 0xf;
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return true;
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}
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dns_msg_question *
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decode_question(const char *buffer, uint32_t *pos)
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{
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dns_msg_question *question = new dns_msg_question;
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std::string m_qName = getDNSstring(buffer, pos);
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llarp::LogDebug("Got question name: ", m_qName);
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const char *moveable = buffer;
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moveable += *pos; // advance to position
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question->name = m_qName;
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question->type = get16bits(moveable);
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(*pos) += 2;
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question->qClass = get16bits(moveable);
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(*pos) += 2;
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return question;
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}
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dns_msg_answer *
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decode_answer(const char *const buffer, uint32_t *pos)
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{
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dns_msg_answer *answer = new dns_msg_answer;
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/*
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llarp_buffer_t bob;
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bob.base = (unsigned char *)buffer;
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bob.sz = 12;
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llarp::DumpBuffer(bob);
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*/
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const char *moveable = buffer;
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// llarp::LogDebug("Advancing to pos ", std::to_string(*pos));
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moveable += (*pos); // advance to position
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// hexDump(moveable, 12);
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// hexDumpAt(buffer, *pos, 12);
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if(*moveable == '\xc0')
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{
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// hexDump(moveable, 2);
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moveable++;
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(*pos)++;
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uint8_t readAt = *moveable;
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uint32_t readAt32 = readAt;
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// llarp::LogInfo("Ref, skip. Read ", readAt32);
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// hexDumpAt(buffer, readAt, 2);
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answer->name = getDNSstring(buffer, &readAt32);
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moveable++;
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(*pos)++;
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// hexDump(moveable, 10);
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// hexDumpAt(buffer, *pos, 10);
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}
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else
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{
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// get DNSString?
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llarp::LogWarn("Need to parse string, implement me");
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/*
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uint32_t readAt32 = *pos;
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answer->name = getDNSstring(buffer, &readAt32);
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llarp::LogInfo("Parsed string ", answer->name, " read ",
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std::to_string(readAt32)); moveable += readAt32; (*pos) += readAt32;
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*/
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// moveable++; (*pos)++;
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}
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/*
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hexDump(moveable, 10);
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uint8_t first = *moveable++; (*pos)++;
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llarp::LogInfo("decode - first", std::to_string(first));
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// SOA hack
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if(first != 12 && first != 14) // 0x0c (c0 0c) 0
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{
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llarp::LogDebug("decode - first isnt 12, stepping back");
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moveable--; (*pos)--; // rewind buffer one byte
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}
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*/
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// hexDump(moveable, 10);
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answer->type = get16bits(moveable);
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(*pos) += 2;
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llarp::LogDebug("Answer Type: ", answer->type);
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// assert(answer->type < 259);
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if(answer->type > 259)
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{
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llarp::LogWarn("Answer type is off the charts");
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}
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answer->aClass = get16bits(moveable);
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(*pos) += 2;
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llarp::LogDebug("Answer Class: ", answer->aClass);
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answer->ttl = get32bits(moveable);
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(*pos) += 4;
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llarp::LogDebug("Answer TTL: ", answer->ttl);
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answer->rdLen = get16bits(moveable);
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(*pos) += 2;
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/*
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llarp::LogDebug("Answer rdL: ", answer->rdLen, " at ",
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std::to_string(*pos));
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*/
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// uint32_t cPos = moveable - buffer;
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// llarp::LogInfo("pos at ", std::to_string(*pos), " calculated: ",
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// std::to_string(cPos));
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// hexDump(moveable, answer->rdLen);
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// hexDumpAt(buffer, *pos, answer->rdLen);
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if(answer->rdLen == 4)
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{
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answer->rData.resize(answer->rdLen);
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memcpy(answer->rData.data(), moveable, answer->rdLen);
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/*
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llarp::LogDebug("Read ", std::to_string(answer->rData[0]), ".",
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std::to_string(answer->rData[1]), ".",
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std::to_string(answer->rData[2]), ".",
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std::to_string(answer->rData[3]));
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*/
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moveable += answer->rdLen;
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(*pos) += answer->rdLen; // advance the length
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answer->record = std::make_unique< llarp::dns::type_1a >();
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answer->record->parse(answer->rData);
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}
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else
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{
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llarp::LogDebug("Got type ", answer->type);
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// FIXME: move this out of here, this shouldn't be responsible for decode
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switch(answer->type)
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{
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case LLARP_DNS_RECTYPE_NS: // NS
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{
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std::string ns = getDNSstring(buffer, pos);
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answer->rData.resize(ns.size());
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memcpy(answer->rData.data(), ns.c_str(),
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ns.size()); // raw copy rData
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// don't really need to do anything here
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moveable += answer->rdLen;
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//(*pos) += answer->rdLen; // advance the length
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|
|
answer->record = std::make_unique< llarp::dns::type_2ns >();
|
|
answer->record->parse(answer->rData);
|
|
}
|
|
break;
|
|
case LLARP_DNS_RECTYPE_CNAME: // CNAME
|
|
{
|
|
std::string cname = getDNSstring(buffer, pos);
|
|
llarp::LogDebug("CNAME ", cname);
|
|
answer->rData.resize(cname.size());
|
|
memcpy(answer->rData.data(), cname.c_str(), cname.size());
|
|
|
|
moveable += answer->rdLen;
|
|
//(*pos) += answer->rdLen; // advance the length
|
|
|
|
answer->record = std::make_unique< llarp::dns::type_5cname >();
|
|
answer->record->parse(answer->rData);
|
|
}
|
|
break;
|
|
case LLARP_DNS_RECTYPE_SOA: // type 6 = SOA
|
|
{
|
|
// 2 names, then 4x 32bit
|
|
// why risk any crashes
|
|
if(answer->rdLen < 24)
|
|
{
|
|
llarp::LogWarn("Weird SOA is less than 24 bytes: ", answer->rdLen);
|
|
}
|
|
/*
|
|
std::string mname = getDNSstring((char *)buffer);
|
|
std::string rname = getDNSstring((char *)buffer);
|
|
uint32_t serial = get32bits(buffer);
|
|
uint32_t refresh = get32bits(buffer);
|
|
uint32_t retry = get32bits(buffer);
|
|
uint32_t expire = get32bits(buffer);
|
|
uint32_t minimum = get32bits(buffer);
|
|
llarp::LogInfo("mname : ", mname);
|
|
llarp::LogInfo("rname : ", rname);
|
|
llarp::LogDebug("serial : ", serial);
|
|
llarp::LogDebug("refresh : ", refresh);
|
|
llarp::LogDebug("retry : ", retry);
|
|
llarp::LogDebug("expire : ", expire);
|
|
llarp::LogDebug("minimum : ", minimum);
|
|
*/
|
|
moveable += answer->rdLen;
|
|
(*pos) += answer->rdLen; // advance the length
|
|
}
|
|
break;
|
|
case LLARP_DNS_RECTYPE_PTR:
|
|
{
|
|
std::string revname = getDNSstring(buffer, pos);
|
|
llarp::LogInfo("revDNSname: ", revname);
|
|
// answer->rData = new uint8_t[answer->rdLen + 1];
|
|
answer->rData.resize(revname.size());
|
|
memcpy(answer->rData.data(), revname.c_str(), revname.size());
|
|
// answer->rData = (uint8_t *)strdup(revname.c_str()); // safer? nope
|
|
moveable += answer->rdLen;
|
|
//(*pos) += answer->rdLen; // advance the length
|
|
|
|
answer->record = std::make_unique< llarp::dns::type_12ptr >();
|
|
answer->record->parse(answer->rData);
|
|
}
|
|
break;
|
|
case LLARP_DNS_RECTYPE_MX:
|
|
{
|
|
uint16_t priority = get16bits(moveable);
|
|
(*pos) += 2;
|
|
std::string revname = getDNSstring(buffer, pos);
|
|
llarp::LogInfo("MX: ", revname, " @ ", priority);
|
|
// answer->rData = new uint8_t[revname.length() + 1];
|
|
// memcpy(answer->rData, revname.c_str(), answer->rdLen);
|
|
answer->rData.resize(revname.size());
|
|
memcpy(answer->rData.data(), revname.c_str(), revname.size());
|
|
moveable += answer->rdLen - 2; // advance the length
|
|
// llarp::LogInfo("leaving at ", std::to_string(*pos));
|
|
// hexDumpAt(buffer, *pos, 5);
|
|
// hexDump(moveable, 5);
|
|
|
|
answer->record = std::make_unique< llarp::dns::type_15mx >();
|
|
answer->record->parse(answer->rData);
|
|
}
|
|
break;
|
|
case LLARP_DNS_RECTYPE_TXT:
|
|
{
|
|
// hexDump(buffer, 5);
|
|
// std::string revname = getDNSstring((char *)buffer);
|
|
llarp::LogInfo("TXT: size: ", answer->rdLen);
|
|
answer->rData.resize(answer->rdLen);
|
|
memcpy(answer->rData.data(), moveable + 1, answer->rdLen);
|
|
moveable += answer->rdLen;
|
|
(*pos) += answer->rdLen; // advance the length
|
|
|
|
answer->record = std::make_unique< llarp::dns::type_16txt >();
|
|
answer->record->parse(answer->rData);
|
|
}
|
|
break;
|
|
// type 28 AAAA
|
|
default:
|
|
moveable += answer->rdLen;
|
|
(*pos) += answer->rdLen; // advance the length
|
|
llarp::LogWarn("Unknown Type ", answer->type);
|
|
break;
|
|
}
|
|
}
|
|
return answer;
|
|
}
|
|
|
|
void
|
|
put16bits(char *&buffer, uint16_t value) throw()
|
|
{
|
|
htobe16buf(buffer, value);
|
|
buffer += 2;
|
|
}
|
|
|
|
void
|
|
put32bits(char *&buffer, uint32_t value) throw()
|
|
{
|
|
htobe32buf(buffer, value);
|
|
buffer += 4;
|
|
}
|
|
|
|
void
|
|
llarp_handle_dns_recvfrom(struct llarp_udp_io *udp,
|
|
const struct sockaddr *addr, llarp_buffer_t buf)
|
|
{
|
|
// auto buffer = llarp::StackBuffer< decltype(castBuf) >(castBuf);
|
|
dns_msg_header hdr;
|
|
if(!decode_hdr(&buf, &hdr))
|
|
{
|
|
llarp::LogError("failed to decode dns header");
|
|
return;
|
|
}
|
|
// rewind
|
|
buf.cur = buf.base;
|
|
llarp::LogDebug("msg id ", hdr.id);
|
|
llarp::LogDebug("msg qr ", (uint8_t)hdr.qr);
|
|
if(!udp)
|
|
{
|
|
llarp::LogError("no udp passed in to handler");
|
|
}
|
|
if(!addr)
|
|
{
|
|
llarp::LogError("no source addr passed in to handler");
|
|
}
|
|
if(hdr.qr)
|
|
{
|
|
llarp::LogDebug("handling as dnsc answer");
|
|
llarp_handle_dnsc_recvfrom(udp, addr, buf);
|
|
}
|
|
else
|
|
{
|
|
llarp::LogDebug("handling as dnsd question");
|
|
llarp_handle_dnsd_recvfrom(udp, addr, buf);
|
|
}
|
|
}
|
|
}
|