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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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The licenses for most software and other practical works are designed
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Notwithstanding any other provision of this License, you have
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THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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CC = gcc
INCFLAGS = -Isrc
CCFLAGS = -std=gnu99 -Wall -Wextra -pedantic -O2
CCFLAGS += $(INCFLAGS)
LDFLAGS += $(INCFLAGS)
BIN = bin
APP = $(BIN)/app
SRC = $(shell find src -name "*.c")
OBJ = $(SRC:%.c=$(BIN)/%.o)
.PHONY: dirs run clean build install uninstall
EOF: clean build
dirs:
mkdir -p ./$(BIN)
mkdir -p ./$(BIN)/src
mkdir -p ./$(BIN)/src/packet
mkdir -p ./$(BIN)/src/client
run: build
$(APP)
build: dirs ${OBJ}
${CC} -o $(APP) $(filter %.o,$^) $(LDFLAGS)
$(BIN)/%.o: %.c
$(CC) -o $@ -c $< $(CCFLAGS)
clean:
rm -rf $(APP)
rm -rf $(BIN)
install:
cp $(APP) /usr/local/bin/wig
uninstall:
rm /usr/local/bin/wig

37
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# Wig
A simple and lightweight dns client written in C
## How to
`usage: wig [@server] [options] domain [qtype]`
For simple usage, just type the domain name followed by the record type: `example.com AAAA`. Or you can just type the domain, `example.com`, and it will default to the A record.
If you want to use a custom dns server, just specify the ip or domain after the @ like `@1.1.1.1` or `@ns1.google.com`.
If you want to specify a port, you can add `-p port_num`.
Finally, if you want to force tcp, you can add `-t`.
## License
This project is Licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html)
## Compilation
Wig only runs on Linux systems that are Posix 1995 compliant
Make sure to have `gcc` and `make` installed, and then run
```shell
$ make # compiles the program
$ sudo make install # installs the binary
```
If you wish to remove the program, you can run
```shell
$ sudo make uninstall # removes the binary
```

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#include <errno.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <poll.h>
#include "addr.h"
void create_ip_addr(uint8_t* domain, IpAddr* addr) {
addr->type = V4;
memcpy(&addr->data.v4, domain, 4);
}
void create_ip_addr6(uint8_t* domain, IpAddr* addr) {
addr->type = V6;
memcpy(&addr->data.v6, domain, 16);
}
void ip_addr_any(IpAddr* addr) {
addr->type = V4;
addr->data.v4.s_addr = htonl(INADDR_ANY);
}
void ip_addr_any6(IpAddr* addr) {
addr->type = V6;
addr->data.v6 = in6addr_any;
}
bool ip_addr_name(const char* hostname, IpAddr* addr) {
struct hostent *he;
struct in_addr **addr_list;
int i;
if ((he = gethostbyname(hostname)) == NULL) {
return false;
}
addr_list = (struct in_addr **) he->h_addr_list;
for(i = 0; addr_list[i] != NULL; i++) {
addr->data.v4 = *addr_list[i];
addr->type = V4;
return true;
}
return false;
}
static struct sockaddr_in create_socket_addr_v4(IpAddr addr, uint16_t port) {
struct sockaddr_in socketaddr;
memset(&socketaddr, 0, sizeof(socketaddr));
socketaddr.sin_family = AF_INET;
socketaddr.sin_port = htons(port);
socketaddr.sin_addr = addr.data.v4;
return socketaddr;
}
static struct sockaddr_in6 create_socket_addr_v6(IpAddr addr, uint16_t port) {
struct sockaddr_in6 socketaddr;
memset(&socketaddr, 0, sizeof(socketaddr));
socketaddr.sin6_family = AF_INET6;
socketaddr.sin6_port = htons(port);
socketaddr.sin6_addr = addr.data.v6;
return socketaddr;
}
static size_t get_addr_len(AddrType type) {
if (type == V4) {
return sizeof(struct sockaddr_in);
} else if (type == V6) {
return sizeof(struct sockaddr_in6);
} else {
return 0;
}
}
void create_socket_addr(uint16_t port, IpAddr addr, SocketAddr* socket) {
socket->type = addr.type;
if (addr.type == V4) {
socket->data.v4 = create_socket_addr_v4(addr, port);
} else if(addr.type == V6) {
socket->data.v6 = create_socket_addr_v6(addr, port);
} else {
exit(EXIT_FAILURE);
}
socket->len = get_addr_len(addr.type);
}
#define ADDR_DOMAIN(addr, var) \
struct sockaddr* var; \
if (addr->type == V4) { \
var = (struct sockaddr*) &addr->data.v4; \
} else if (addr->type == V6) { \
var = (struct sockaddr*) &addr->data.v6; \
} else { \
return -1; \
}
#define ADDR_AFNET(type, var) \
int var; \
if (type == V4) { \
var = AF_INET; \
} else if (type == V6) { \
var = AF_INET6; \
} else { \
return -1; \
}
int32_t create_udp_socket(AddrType type, UdpSocket* sock) {
ADDR_AFNET(type, __domain)
sock->type = type;
sock->sockfd = socket(__domain, SOCK_DGRAM, 0);
return sock->sockfd;
}
int32_t bind_udp_socket(SocketAddr* addr, UdpSocket* sock) {
if (addr->type == V6) {
int v6OnlyEnabled = 0;
int32_t res = setsockopt(
sock->sockfd,
IPPROTO_IPV6,
IPV6_V6ONLY,
&v6OnlyEnabled,
sizeof(v6OnlyEnabled)
);
if (res < 0) return res;
}
ADDR_DOMAIN(addr, __addr)
return bind(sock->sockfd, __addr, addr->len);
}
static bool timeout (int connfd, int ms) {
struct pollfd fd;
int res;
fd.fd = connfd;
fd.events = POLLIN;
res = poll(&fd, 1, ms);
return res == 0;
}
int32_t read_udp_socket(UdpSocket* socket, void* buffer, uint16_t len, SocketAddr* clientaddr) {
clientaddr->type = socket->type;
clientaddr->len = get_addr_len(socket->type);
ADDR_DOMAIN(clientaddr, __addr)
if (timeout(socket->sockfd, 1000)) {
errno = ETIMEDOUT;
return -1;
}
return recvfrom(
socket->sockfd,
buffer,
(size_t) len,
MSG_WAITALL,
__addr,
(uint32_t*) &clientaddr->len
);
}
int32_t write_udp_socket(UdpSocket* socket, void* buffer, uint16_t len, SocketAddr* clientaddr) {
ADDR_DOMAIN(clientaddr, __addr)
return sendto(
socket->sockfd,
buffer,
(size_t) len,
MSG_CONFIRM,
__addr,
(uint32_t) clientaddr->len
);
}
int32_t close_udp_socket(UdpSocket* socket) {
return close(socket->sockfd);
}
int32_t create_tcp_socket(AddrType type, TcpSocket* sock) {
ADDR_AFNET(type, __domain)
sock->type = type;
sock->sockfd = socket(__domain, SOCK_STREAM, 0);
return sock->sockfd;
}
int32_t bind_tcp_socket(SocketAddr* addr, TcpSocket* sock) {
if (addr->type == V6) {
int v6OnlyEnabled = 0;
int32_t res = setsockopt(
sock->sockfd,
IPPROTO_IPV6,
IPV6_V6ONLY,
&v6OnlyEnabled,
sizeof(v6OnlyEnabled)
);
if (res < 0) return res;
}
ADDR_DOMAIN(addr, __addr)
return bind(sock->sockfd, __addr, addr->len);
}
int32_t listen_tcp_socket(TcpSocket* socket, uint32_t max) {
return listen(socket->sockfd, max);
}
int32_t accept_tcp_socket(TcpSocket* socket, TcpStream* stream) {
stream->clientaddr.type = socket->type;
memset(&stream->clientaddr, 0, sizeof(SocketAddr));
SocketAddr* addr = &stream->clientaddr;
ADDR_DOMAIN(addr, __addr)
stream->streamfd = accept(
socket->sockfd,
__addr,
(uint32_t*) &stream->clientaddr.len
);
return stream->streamfd;
}
int32_t close_tcp_socket(TcpSocket* socket) {
return close(socket->sockfd);
}
int32_t connect_tcp_stream(SocketAddr* servaddr, TcpStream* stream) {
TcpSocket socket;
int32_t res = create_tcp_socket(servaddr->type, &socket);
if (res < 0) return res;
stream->clientaddr = *servaddr;
stream->streamfd = socket.sockfd;
ADDR_DOMAIN(servaddr, __addr)
return connect(
socket.sockfd,
__addr,
servaddr->len
);
}
int32_t read_tcp_stream(TcpStream* stream, void* buffer, uint16_t len) {
if (timeout(stream->streamfd, 3000)) {
errno = ETIMEDOUT;
return -1;
}
return recv(stream->streamfd, buffer, len, MSG_WAITALL);
}
int32_t write_tcp_stream(TcpStream* stream, void* buffer, uint16_t len) {
return send(stream->streamfd, buffer, len, MSG_NOSIGNAL);
}
int32_t close_tcp_stream(TcpStream* stream) {
return close(stream->streamfd);
}

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#pragma once
#include "../packet/record.h"
#include <string.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
typedef enum {
V4,
V6
} AddrType;
typedef struct {
AddrType type;
union {
struct in_addr v4;
struct in6_addr v6;
} data;
} IpAddr;
void create_ip_addr(uint8_t* domain, IpAddr* addr);
void create_ip_addr6(uint8_t* domain, IpAddr* addr);
void ip_addr_any(IpAddr* addr);
void ip_addr_any6(IpAddr* addr);
bool ip_addr_name(const char* name, IpAddr* addr);
typedef struct {
AddrType type;
union {
struct sockaddr_in v4;
struct sockaddr_in6 v6;
} data;
size_t len;
} SocketAddr;
void create_socket_addr(uint16_t port, IpAddr addr, SocketAddr* socket);
typedef struct {
AddrType type;
uint32_t sockfd;
} UdpSocket;
int32_t create_udp_socket(AddrType type, UdpSocket* socket);
int32_t bind_udp_socket(SocketAddr* addr, UdpSocket* socket);
int32_t read_udp_socket(UdpSocket* socket, void* buffer, uint16_t len, SocketAddr* clientaddr);
int32_t write_udp_socket(UdpSocket* socket, void* buffer, uint16_t len, SocketAddr* clientaddr);
int32_t close_udp_socket(UdpSocket* socket);
typedef struct {
AddrType type;
uint32_t sockfd;
} TcpSocket;
typedef struct {
SocketAddr clientaddr;
uint32_t streamfd;
} TcpStream;
int32_t create_tcp_socket(AddrType type, TcpSocket* socket);
int32_t bind_tcp_socket(SocketAddr* addr, TcpSocket* socket);
int32_t listen_tcp_socket(TcpSocket* socket, uint32_t max);
int32_t accept_tcp_socket(TcpSocket* socket, TcpStream* stream);
int32_t close_tcp_socket(TcpSocket* socket);
int32_t connect_tcp_stream(SocketAddr* servaddr, TcpStream* stream);
int32_t read_tcp_stream(TcpStream* stream, void* buffer, uint16_t len);
int32_t write_tcp_stream(TcpStream* stream, void* buffer, uint16_t len);
int32_t close_tcp_stream(TcpStream* stream);

167
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#include <ctype.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "addr.h"
#include "binding.h"
static void read_to_packet(uint8_t* buf, uint16_t len, Packet* packet) {
PacketBuffer* pkbuffer = buffer_create(len);
for (int i = 0; i < len; i++) {
buffer_write(pkbuffer, buf[i]);
}
buffer_seek(pkbuffer, 0);
read_packet(pkbuffer, packet);
buffer_free(pkbuffer);
}
static bool read_udp(Connection* connection, Packet* packet) {
uint8_t buffer[512];
int32_t n = read_udp_socket(
&connection->sock.udp.udp,
buffer,
512,
&connection->sock.udp.clientaddr
);
if (n < 0) {
return false;
}
read_to_packet(buffer, n, packet);
return true;
}
static bool read_tcp(Connection* connection, Packet* packet) {
uint16_t len;
if ( read_tcp_stream(
&connection->sock.tcp,
&len,
sizeof(uint16_t)
) < 2) {
return false;
}
len = ntohs(len);
uint8_t buffer[len];
if (read_tcp_stream(
&connection->sock.tcp,
buffer,
len
) < len) {
return false;
}
read_to_packet(buffer, len, packet);
return true;
}
static bool read_connection(Connection* connection, Packet* packet) {
if (connection->type == UDP) {
return read_udp(connection, packet);
} else if (connection->type == TCP) {
return read_tcp(connection, packet);
}
return false;
}
static bool write_udp(Connection* connection, uint8_t* buf, uint16_t len) {
if (len > 512) {
buf[2] = buf[2] | 0x03;
len = 512;
}
return write_udp_socket(
&connection->sock.udp.udp,
buf,
len,
&connection->sock.udp.clientaddr
) == len;
}
static bool write_tcp(Connection* connection, uint8_t* buf, uint16_t len) {
uint16_t net_len = htons(len);
if (write_tcp_stream(
&connection->sock.tcp,
&net_len,
sizeof(uint16_t)
) < 0) {
return false;
}
if (write_tcp_stream(
&connection->sock.tcp,
buf,
len
) < 0) {
return false;
}
return true;
}
static bool write_connection(Connection* connection, Packet* packet) {
PacketBuffer* pkbuffer = buffer_create(64);
write_packet(pkbuffer, packet);
uint16_t len = buffer_get_size(pkbuffer);
uint8_t* buffer = buffer_get_ptr(pkbuffer);
bool success = false;
if(connection->type == UDP) {
success = write_udp(connection, buffer, len);
} else if(connection->type == TCP) {
success = write_tcp(connection, buffer, len);
};
buffer_free(pkbuffer);
return success;
}
void free_connection(Connection* connection) {
if (connection->type == TCP) {
close_tcp_stream(&connection->sock.tcp);
}
}
static bool create_udp_request(SocketAddr* addr, Connection* request) {
if ( create_udp_socket(addr->type, &request->sock.udp.udp) < 0) {
return false;
}
request->sock.udp.clientaddr = *addr;
return true;
}
static bool create_tcp_request(SocketAddr* addr, Connection* request) {
if( connect_tcp_stream(addr, &request->sock.tcp) < 0) {
return false;
}
return true;
}
bool create_request(BindingType type, SocketAddr* addr, Connection* request) {
request->type = type;
if (type == UDP) {
return create_udp_request(addr, request);
} else if (type == TCP) {
return create_tcp_request(addr, request);
} else {
return true;
}
}
bool request_packet(Connection* request, Packet* in, Packet* out) {
if (!write_connection(request, in)) {
return false;
}
if (!read_connection(request, out)) {
return false;
}
return true;
}
void free_request(Connection* connection) {
if (connection->type == UDP) {
close_udp_socket(&connection->sock.udp.udp);
} else if (connection->type == TCP) {
close_tcp_stream(&connection->sock.tcp);
}
}

26
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#pragma once
#include "../packet/packet.h"
#include "addr.h"
#include <netinet/in.h>
typedef enum {
UDP,
TCP
} BindingType;
typedef struct {
BindingType type;
union {
struct {
UdpSocket udp;
SocketAddr clientaddr;
} udp;
TcpStream tcp;
} sock;
} Connection;
bool create_request(BindingType type, SocketAddr* addr, Connection* request);
bool request_packet(Connection* request, Packet* in, Packet* out);
void free_request(Connection* connection);

177
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#include "client.h"
#include "../packet/question.h"
#include "addr.h"
#include "binding.h"
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <sys/time.h>
void resolve_default_server(IpAddr* addr) {
res_init();
addr->data.v4 = _res.nsaddr_list[0].sin_addr;
addr->type = V4;
}
static void push_question(Question** buf, Question q, uint8_t* amount, uint8_t* capacity) {
if (*amount >= *capacity) {
*capacity *= 2;
*buf = realloc(*buf, sizeof(Question) * *capacity);
}
(*buf)[*amount] = q;
(*amount)++;
}
void resolve_questions(int argc, char** argv, uint8_t* len, Question** questions) {
assert(argc > 0);
uint8_t amount = 0;
uint8_t capacity = 1;
Question* buf = malloc(sizeof(Question) * capacity);
Question q;
RecordType t;
if (argc == 1 && str_to_qtype(argv[0], &t)) {
create_question("", NS, &q);
push_question(&buf, q, &amount, &capacity);
*questions = buf;
*len = 1;
return;
}
for (int i = 0; i < argc; i++) {
if (str_to_qtype(argv[i], &t)) {
if (i + 1 == argc) break;
create_question(argv[i+1], t, &q);
i++;
} else if (i + 1 < argc && str_to_qtype(argv[i+1], &t)){
create_question(argv[i], t, &q);
i++;
} else {
create_question(argv[i], A, &q);
}
push_question(&buf, q, &amount, &capacity);
}
*questions = buf;
*len = amount;
}
static void print_result(Packet* packet, const char* type, uint32_t ms) {
printf(">> Recieved response\n");
printf("Id: %hu, Code: %s\n",
packet->header.id,
str_from_code(packet->header.rescode)
);
printf("Questions: %hu, Answers: %hu, Authorities: %hu, Resources: %hu\n",
packet->header.questions,
packet->header.answers,
packet->header.authoritative_entries,
packet->header.resource_entries
);
if (packet->header.questions > 0) {
printf("\n>> Question Section\n");
for (uint16_t i = 0; i < packet->header.questions; i++) {
print_question(&packet->questions[i]);
}
}
if (packet->header.answers > 0) {
printf("\n>> Answer Section\n");
for (uint16_t i = 0; i < packet->header.answers; i++) {
print_record(&packet->answers[i]);
}
}
if (packet->header.authoritative_entries > 0) {
printf("\n>> Authority Section\n");
for (uint16_t i = 0; i < packet->header.authoritative_entries; i++) {
print_record(&packet->authorities[i]);
}
}
if (packet->header.resource_entries > 0) {
printf("\n>> Resource Section\n");
for (uint16_t i = 0; i < packet->header.resource_entries; i++) {
print_record(&packet->resources[i]);
}
}
printf("\n>> Query time: %ums (%s)\n", ms, type);
}
void resolve(IpAddr server, Options options, Question* questions, uint8_t len) {
struct timeval stop, start;
gettimeofday(&start, NULL);
SocketAddr addr;
create_socket_addr(options.port, server, &addr);
Packet req;
memset(&req, 0, sizeof(Packet));
srand(time(NULL));
req.header.id = rand() % 65536;
req.header.questions = len;
req.header.recursion_desired = true;
req.questions = questions;
Connection conn;
if (options.force_tcp) goto tcp;
if (!create_request(UDP, &addr, &conn)) {
printf("error: failed to create udp request: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
Packet res;
if (!request_packet(&conn, &req, &res)) {
free_request(&conn);
free_packet(&req);
printf("error: failed to request udp packet: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
free_request(&conn);
if (!res.header.truncated_message) {
gettimeofday(&stop, NULL);
uint32_t ms = (stop.tv_sec - start.tv_sec) * 1000000 + stop.tv_usec - start.tv_usec;
print_result(&res, "UDP", ms / 1000);
free_packet(&req);
free_packet(&res);
return;
}
free_packet(&res);
printf("Response truncated, retrying in TCP...\n");
tcp:
if (!create_request(TCP, &addr, &conn)) {
printf("error: failed to create tcp request: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
if (!request_packet(&conn, &req, &res)) {
free_request(&conn);
printf("error: failed to request tcp packet: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
gettimeofday(&stop, NULL);
uint32_t ms = (stop.tv_sec - start.tv_sec) * 1000000 + stop.tv_usec - start.tv_usec;
print_result(&res, "TCP", ms / 1000);
free_request(&conn);
free_packet(&req);
free_packet(&res);
}

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#pragma once
#include "addr.h"
#include "../packet/packet.h"
typedef struct {
uint16_t port;
bool force_tcp;
} Options;
void resolve_default_server(IpAddr* addr);
void resolve_questions(int argc, char** argv, uint8_t* len, Question** questions);
void resolve(IpAddr server, Options options, Question* questions, uint8_t lem);

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#include "client/addr.h"
#include "client/client.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#define DEFAULT_PORT 53
static void help() {
printf("wig: a simple dns client\n");
printf("usage: wig [@server] [options] domain [qtype]\n");
printf("arguments: \n");
printf("\t@server\t specify a dns server (@example.com)\n");
printf("\t-p\t specify a port (-p 2000)\n");
printf("\t-t\t force dns request to do tcp first\n");
exit(EXIT_SUCCESS);
}
static void parse_server (char* argv, char** server) {
if (*server != NULL) {
printf("error: only one dns server argument is allowed\n");
exit(EXIT_FAILURE);
}
if (strlen(argv) < 1) {
printf("error: dns server argument cannot be empty\n");
exit(EXIT_FAILURE);
}
*server = argv;
}
static int parse_arguent (int argc, char** argv, Options* options) {
if (strlen(argv[0]) < 2) {
printf("error: expected option after -\n");
exit(EXIT_FAILURE);
}
if (strcmp(argv[0], "-p") == 0) {
if (argc < 2) {
printf("error: expected port after -p\n");
exit(EXIT_FAILURE);
}
if ((options->port = strtoul(argv[1], NULL, 10)) == 0) {
printf("error: %s is not a valid port\n", argv[1]);
exit(EXIT_FAILURE);
}
return 1;
} else if (strcmp(argv[0], "-t") == 0) {
options->force_tcp = true;
return 0;
} else if (
strcmp(argv[0], "-h") == 0 ||
strcmp(argv[0], "--help") == 0
) {
help();
}
printf("error: unkown option %s\n", argv[0]);
exit(EXIT_FAILURE);
}
int main(int argc, char** argv) {
if (argc < 1) return EXIT_FAILURE;
int dargs = 1;
char* server = NULL;
Options options;
options.port = DEFAULT_PORT;
options.force_tcp = false;
for (int i = 1; i < argc; i++) {
char s = argv[i][0];
if (s == '@') {
dargs++;
parse_server(argv[i] + 1, &server);
} else if (s == '-') {
int o = parse_arguent(argc - i, &argv[i], &options);
dargs++;
dargs += o;
i += o;
} else {
break;
}
}
if (argc - dargs < 1) {
printf("usage: wig [@server] [options] domain [qtype]\n");
return EXIT_FAILURE;
}
IpAddr addr;
if (server != NULL) {
if (!ip_addr_name(server, &addr)) {
printf("error: %s is not a valid domain\n", server);
exit(EXIT_FAILURE);
}
} else {
resolve_default_server(&addr);
}
Question* arr;
uint8_t len;
resolve_questions(argc - dargs, &argv[dargs], &len, &arr);
resolve(addr, options, arr, len);
return EXIT_SUCCESS;
}

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#include "buffer.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct PacketBuffer {
uint8_t* arr;
int capacity;
int index;
int size;
};
PacketBuffer* buffer_create(int capacity) {
PacketBuffer* buffer = malloc(sizeof(PacketBuffer));
buffer->arr = malloc(capacity);
memset(buffer->arr, 0, capacity);
buffer->capacity = capacity;
buffer->size = 0;
buffer->index = 0;
return buffer;
}
void buffer_free(PacketBuffer* buffer) {
free(buffer->arr);
free(buffer);
}
void buffer_seek(PacketBuffer* buffer, int index) {
buffer->index = index;
}
uint8_t buffer_read(PacketBuffer* buffer) {
if (buffer->index >= buffer->size) {
return 0;
}
uint8_t data = buffer->arr[buffer->index];
buffer->index++;
return data;
}
uint16_t buffer_read_short(PacketBuffer* buffer) {
return
(uint16_t) buffer_read(buffer) << 8 |
(uint16_t) buffer_read(buffer);
}
uint32_t buffer_read_int(PacketBuffer* buffer) {
return
(uint32_t) buffer_read(buffer) << 24 |
(uint32_t) buffer_read(buffer) << 16 |
(uint32_t) buffer_read(buffer) << 8 |
(uint32_t) buffer_read(buffer);
}
uint8_t buffer_get(PacketBuffer* buffer, int index) {
if (index >= buffer->size) {
return 0;
}
uint8_t data = buffer->arr[index];
return data;
}
uint8_t* buffer_get_range(PacketBuffer* buffer, int start, int len) {
uint8_t* arr = malloc(len);
for (int i = 0; i < len; i++) {
arr[i] = buffer_get(buffer, start + i);
}
return arr;
}
uint16_t buffer_get_size(PacketBuffer* buffer) {
return (uint16_t) buffer->size + 1;
}
static void write(uint8_t** buffer, uint8_t* size, uint8_t* capacity, uint8_t data) {
if (*size >= *capacity) {
if (*capacity >= 128) {
*capacity = 255;
} else {
*capacity *= 2;
}
*buffer = realloc(*buffer, *capacity);
}
(*buffer)[*size] = data;
(*size)++;
}
void buffer_read_qname(PacketBuffer* buffer, uint8_t** out) {
int index = buffer->index;
int jumped = 0;
int max_jumps = 5;
int jumps_performed = 0;
uint8_t length = 0;
uint8_t capacity = 8;
*out = malloc(capacity);
write(out, &length, &capacity, 0);
while(1) {
if (jumps_performed > max_jumps) {
break;
}
uint8_t len = buffer_get(buffer, index);
if ((len & 0xC0) == 0xC0) {
if (jumped == 0) {
buffer_seek(buffer, index + 2);
}
uint16_t b2 = (uint16_t) buffer_get(buffer, index + 1);
uint16_t offset = ((((uint16_t) len) ^ 0xC0) << 8) | b2;
index = (int) offset;
jumped = 1;
jumps_performed++;
continue;
}
index++;
if (len == 0) {
break;
}
if (length > 1) {
write(out, &length, &capacity, '.');
}
uint8_t* range = buffer_get_range(buffer, index, len);
for (uint8_t i = 0; i < len; i++) {
write(out, &length, &capacity, range[i]);
}
free(range);
index += (int) len;
}
if (jumped == 0) {
buffer_seek(buffer, index);
}
(*out)[0] = length - 1;
}
void buffer_read_string(PacketBuffer* buffer, uint8_t** out) {
uint8_t len = buffer_read(buffer);
buffer_read_n(buffer, out, len);
}
static void buffer_expand(PacketBuffer* buffer, int capacity) {
if (buffer->capacity >= capacity) return;
buffer->arr = realloc(buffer->arr, capacity);
memset(buffer->arr + buffer->capacity, 0, capacity - buffer->capacity);
buffer->capacity = capacity;
}
void buffer_read_n(PacketBuffer* buffer, uint8_t** out, uint8_t len) {
buffer_expand(buffer, buffer->index + len + 1);
*out = malloc(len + 1);
*out[0] = len;
memcpy(*out + 1, buffer->arr + buffer->index, len);
buffer->index += len;
}
void buffer_write(PacketBuffer* buffer, uint8_t data) {
buffer_expand(buffer, buffer->index);
if (buffer->size < buffer->index + 1) {
buffer->size = buffer->index + 1;
}
buffer->arr[buffer->index] = data;
buffer->index++;
}
void buffer_write_short(PacketBuffer* buffer, uint16_t data) {
buffer_write(buffer, (uint8_t)(data >> 8));
buffer_write(buffer, (uint8_t)(data & 0xFF));
}
void buffer_write_int(PacketBuffer* buffer, uint32_t data) {
buffer_write(buffer, (uint8_t)(data >> 24));
buffer_write(buffer, (uint8_t)(data >> 16));
buffer_write(buffer, (uint8_t)(data >> 8));
buffer_write(buffer, (uint8_t)(data & 0xFF));
}
void buffer_write_qname(PacketBuffer* buffer, uint8_t* in) {
uint8_t part = 0;
uint8_t len = in[0];
buffer_write(buffer, 0);
if (len == 0) {
return;
}
for(uint8_t i = 0; i < len; i ++) {
if (in[i+1] == '.') {
buffer_set(buffer, part, buffer->index - (int)part - 1);
buffer_write(buffer, 0);
part = 0;
} else {
buffer_write(buffer, in[i+1]);
part++;
}
}
buffer_set(buffer, part, buffer->index - (int)part - 1);
buffer_write(buffer, 0);
}
void buffer_write_string(PacketBuffer* buffer, uint8_t* in) {
buffer_write(buffer, in[0]);
buffer_write_n(buffer, in + 1, in[0]);
}
void buffer_write_n(PacketBuffer* buffer, uint8_t* in, int len) {
buffer_expand(buffer, buffer->size + len);
memcpy(buffer->arr + buffer->index, in, len);
buffer->size += len;
buffer->index += len;
}
void buffer_set(PacketBuffer* buffer, uint8_t data, int index) {
if (index > buffer->size) {
return;
}
buffer->arr[index] = data;
}
void buffer_set_uint16_t(PacketBuffer* buffer, uint16_t data, int index) {
buffer_set(buffer, (uint8_t)(data >> 8), index);
buffer_set(buffer, (uint8_t)(data & 0xFF), index + 1);
}
int buffer_get_index(PacketBuffer* buffer) {
return buffer->index;
}
void buffer_step(PacketBuffer* buffer, int len) {
buffer->index += len;
}
uint8_t* buffer_get_ptr(PacketBuffer* buffer) {
return buffer->arr;
}

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#pragma once
#include <stdint.h>
typedef struct PacketBuffer PacketBuffer;
PacketBuffer* buffer_create(int capacity);
void buffer_free(PacketBuffer* buffer);
void buffer_seek(PacketBuffer* buffer, int index);
uint8_t buffer_read(PacketBuffer* buffer);
uint16_t buffer_read_short(PacketBuffer* buffer);
uint32_t buffer_read_int(PacketBuffer* buffer);
uint8_t buffer_get(PacketBuffer* buffer, int index);
uint8_t* buffer_get_range(PacketBuffer* buffer, int start, int len);
uint16_t buffer_get_size(PacketBuffer* buffer);
void buffer_read_qname(PacketBuffer* buffer, uint8_t** out);
void buffer_read_string(PacketBuffer* buffer, uint8_t** out);
void buffer_read_n(PacketBuffer* buffer, uint8_t** out, uint8_t len);
void buffer_write(PacketBuffer* buffer, uint8_t data);
void buffer_write_short(PacketBuffer* buffer, uint16_t data);
void buffer_write_int(PacketBuffer* buffer, uint32_t data);
void buffer_write_qname(PacketBuffer* buffer, uint8_t* in);
void buffer_write_string(PacketBuffer* buffer, uint8_t* in);
void buffer_write_n(PacketBuffer* buffer, uint8_t* in, int len);
void buffer_set(PacketBuffer* buffer, uint8_t data, int index);
void buffer_set_uint16_t(PacketBuffer* buffer, uint16_t data, int index);
int buffer_get_index(PacketBuffer* buffer);
void buffer_step(PacketBuffer* buffer, int len);
uint8_t* buffer_get_ptr(PacketBuffer* buffer);

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#include "header.h"
#include "buffer.h"
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
uint8_t rescode_to_id(ResultCode code) {
switch(code) {
case NOERROR:
return 0;
case FORMERR:
return 1;
case SERVFAIL:
return 2;
case NXDOMAIN:
return 3;
case NOTIMP:
return 4;
case REFUSED:
return 5;
default:
return 2;
}
}
ResultCode rescode_from_id(uint8_t id) {
switch(id) {
case 0:
return NOERROR;
case 1:
return FORMERR;
case 2:
return SERVFAIL;
case 3:
return NXDOMAIN;
case 4:
return NOTIMP;
case 5:
return REFUSED;
default:
return FORMERR;
}
}
const char* str_from_code(ResultCode code) {
switch(code) {
case NOERROR: return "NOERROR";
case FORMERR: return "FORMERR";
case SERVFAIL: return "SERVFAIL";
case NXDOMAIN: return "NXDOMAIN";
case NOTIMP: return "NOTIMP";
case REFUSED: return "REFUSED";
default: return "????";
}
}
#define MAX(var, max) var = var > max ? max : var;
void read_header(PacketBuffer* buffer, Header* header) {
// memset(header, 0, sizeof(Header));
header->id = buffer_read_short(buffer);
uint8_t a = buffer_read(buffer);
header->recursion_desired = (a & (1 << 0)) > 0;
header->truncated_message = (a & (1 << 1)) > 0;
header->authorative_answer = (a & (1 << 2)) > 0;
header->opcode = (a >> 3) & 0x0F;
header->response = (a & (1 << 7)) > 0;
uint8_t b = buffer_read(buffer);
header->rescode = rescode_from_id(b & 0x0F);
header->checking_disabled = (b & (1 << 4)) > 0;
header->authed_data = (b& (1 << 4)) > 0;
header->z = (b & (1 << 6)) > 0;
header->recursion_available = (b & (1 << 7)) > 0;
header->questions = buffer_read_short(buffer);
header->answers = buffer_read_short(buffer);
header->authoritative_entries = buffer_read_short(buffer);
header->resource_entries = buffer_read_short(buffer);
}
void write_header(PacketBuffer* buffer, Header* header) {
buffer_write_short(buffer, header->id);
buffer_write(buffer,
((uint8_t) header->recursion_desired) |
((uint8_t) header->truncated_message << 1) |
((uint8_t) header->authorative_answer << 2) |
(header->opcode << 3) |
((uint8_t) header->response << 7)
);
buffer_write(buffer,
(rescode_to_id(header->rescode)) |
((uint8_t) header->checking_disabled << 4) |
((uint8_t) header->authed_data << 5) |
((uint8_t) header->z << 6) |
((uint8_t) header->recursion_available << 7)
);
buffer_write_short(buffer, header->questions);
buffer_write_short(buffer, header->answers);
buffer_write_short(buffer, header->authoritative_entries);
buffer_write_short(buffer, header->resource_entries);
}

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#pragma once
#include "buffer.h"
#include <stdbool.h>
typedef enum {
NOERROR, // 0
FORMERR, // 1
SERVFAIL, // 2
NXDOMAIN, // 3,
NOTIMP, // 4
REFUSED, // 5
} ResultCode;
uint8_t rescode_to_id(ResultCode code);
ResultCode rescode_from_id(uint8_t id);
typedef struct {
uint16_t id;
bool recursion_desired; // 1 bit
bool truncated_message; // 1 bit
bool authorative_answer; // 1 bit
uint8_t opcode; // 4 bits
bool response; // 1 bit
ResultCode rescode; // 4 bits
bool checking_disabled; // 1 bit
bool authed_data; // 1 bit
bool z; // 1 bit
bool recursion_available; // 1 bit
uint16_t questions; // 16 bits
uint16_t answers; // 16 bits
uint16_t authoritative_entries; // 16 bits
uint16_t resource_entries; // 16 bits
} Header;
void read_header(PacketBuffer* buffer, Header* header);
void write_header(PacketBuffer* buffer, Header* header);
const char* str_from_code(ResultCode code);

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#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "packet.h"
#include "buffer.h"
#include "header.h"
#include "question.h"
#include "record.h"
void read_packet(PacketBuffer* buffer, Packet* packet) {
read_header(buffer, &packet->header);
packet->questions = malloc(sizeof(Question) * packet->header.questions);
for(uint16_t i = 0; i < packet->header.questions; i++) {
if (!read_question(buffer, &packet->questions[i])) {
i--;
packet->header.questions--;
}
}
packet->answers = malloc(sizeof(Record) * packet->header.answers);
for(uint16_t i = 0; i < packet->header.answers; i++) {
if (!read_record(buffer, &packet->answers[i])) {
i--;
packet->header.answers--;
}
}
packet->authorities = malloc(sizeof(Record) * packet->header.authoritative_entries);
for(uint16_t i = 0; i < packet->header.authoritative_entries; i++) {
if (!read_record(buffer, &packet->authorities[i])) {
i--;
packet->header.authoritative_entries--;
}
}
packet->resources = malloc(sizeof(Record) * packet->header.resource_entries);
for(uint16_t i = 0; i < packet->header.resource_entries; i++) {
if (!read_record(buffer, &packet->resources[i])) {
i--;
packet->header.resource_entries--;
}
}
}
void write_packet(PacketBuffer* buffer, Packet* packet) {
write_header(buffer, &packet->header);
for(uint16_t i = 0; i < packet->header.questions; i++) {
write_question(buffer, &packet->questions[i]);
}
for(uint16_t i = 0; i < packet->header.answers; i++) {
write_record(buffer, &packet->answers[i]);
}
for(uint16_t i = 0; i < packet->header.authoritative_entries; i++) {
write_record(buffer, &packet->authorities[i]);
}
for(uint16_t i = 0; i < packet->header.resource_entries; i++) {
write_record(buffer, &packet->resources[i]);
}
}
void free_packet(Packet* packet) {
for(uint16_t i = 0; i < packet->header.questions; i++) {
free_question(&packet->questions[i]);
}
free(packet->questions);
for(uint16_t i = 0; i < packet->header.answers; i++) {
free_record(&packet->answers[i]);
}
free(packet->answers);
for(uint16_t i = 0; i < packet->header.authoritative_entries; i++) {
free_record(&packet->authorities[i]);
}
free(packet->authorities);
for(uint16_t i = 0; i < packet->header.resource_entries; i++) {
free_record(&packet->resources[i]);
}
free(packet->resources);
}
bool get_random_a(Packet* packet, IpAddr* addr) {
for (uint16_t i = 0; i < packet->header.answers; i++) {
Record record = packet->answers[i];
if (record.type == A) {
create_ip_addr(record.data.a.addr, addr);
return true;
} else if (record.type == AAAA) {
create_ip_addr6(record.data.aaaa.addr, addr);
return true;
}
}
return false;
}
static bool ends_with(uint8_t* full, uint8_t* end) {
uint8_t check = end[0];
uint8_t len = full[0];
if (check > len) {
return false;
}
for(uint8_t i = 0; i < check; i++) {
if (end[check - 1 - i] != full[len - 1 - i]) {
return false;
}
}
return true;
}
static bool equals(uint8_t* a, uint8_t* b) {
if (a[0] != b[0]) {
return false;
}
for(uint8_t i = 1; i < a[0] + 1; i++) {
if(a[i] != b[i]) {
return false;
}
}
return true;
}
bool get_resolved_ns(Packet* packet, uint8_t* qname, IpAddr* addr) {
for (uint16_t i = 0; i < packet->header.authoritative_entries; i++) {
Record record = packet->authorities[i];
if (record.type != NS) {
continue;
}
if(!ends_with(qname, record.domain)) {
continue;
}
for (uint16_t i = 0; i < packet->header.resource_entries; i++) {
Record resource = packet->resources[i];
if (!equals(record.data.ns.host, resource.domain)) {
continue;
}
if (resource.type == A) {
create_ip_addr(record.data.a.addr, addr);
return true;
} else if (resource.type == AAAA) {
create_ip_addr6(record.data.aaaa.addr, addr);
return true;
}
}
}
return false;
}
bool get_unresoled_ns(Packet* packet, uint8_t* qname, Question* question) {
for (uint16_t i = 0; i < packet->header.authoritative_entries; i++) {
Record record = packet->authorities[i];
if (record.type != NS) {
continue;
}
if(!ends_with(qname, record.domain)) {
continue;
}
uint8_t* host = record.data.ns.host;
question->qtype = NS;
question->domain = malloc(host[0] + 1);
memcpy(question->domain, host, host[0] + 1);
return true;
}
return false;
}

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#pragma once
#include "buffer.h"
#include "question.h"
#include "header.h"
#include "record.h"
#include "../client/addr.h"
#include <stdbool.h>
typedef struct {
Header header;
Question* questions;
Record* answers;
Record* authorities;
Record* resources;
} Packet;
void read_packet(PacketBuffer* buffer, Packet* packet);
void write_packet(PacketBuffer* buffer, Packet* packet);
void free_packet(Packet* packet);
bool get_random_a(Packet* packet, IpAddr* addr);
bool get_resolved_ns(Packet* packet, uint8_t* qname, IpAddr* addr);
bool get_unresoled_ns(Packet* packet, uint8_t* qname, Question* question);

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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include "question.h"
#include "buffer.h"
#include "record.h"
void create_question(const char* domain, RecordType qtype, Question* question) {
uint8_t len = strlen(domain);
question->domain = malloc(len + 1);
question->qtype = qtype;
question->domain[0] = len;
question->cls = 1;
memcpy(question->domain + 1, domain, len);
}
bool read_question(PacketBuffer* buffer, Question* question) {
buffer_read_qname(buffer, &question->domain);
uint16_t qtype_num = buffer_read_short(buffer);
record_from_id(qtype_num, &question->qtype);
question->cls = buffer_read_short(buffer);
if (question->qtype == UNKOWN) {
free(question->domain);
return false;
}
return true;
}
void write_question(PacketBuffer* buffer, Question* question) {
buffer_write_qname(buffer, question->domain);
uint16_t id = record_to_id(question->qtype);
buffer_write_short(buffer, id);
buffer_write_short(buffer, question->cls);
}
void free_question(Question* question) {
free(question->domain);
}
static const char* class_to_str(Question* question) {
switch(question->cls) {
case 1: return "IN";
case 3: return "CH";
case 4: return "HS";
default: return "??";
}
}
static const char* qtype_to_str(Question* question) {
switch(question->qtype) {
case A: return "A";
case NS: return "NS";
case CNAME: return "CNAME";
case SOA: return "SOA";
case PTR: return "PTR";
case MX: return "MX";
case TXT: return "TXT";
case AAAA: return "AAAA";
case SRV: return "SRV";
case CAA: return "CAA";
default: return "UNKOWN";
}
}
void print_question(Question* question) {
printf("%.*s.\t%s %s\n",
question->domain[0],
question->domain + 1,
class_to_str(question),
qtype_to_str(question)
);
}

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#pragma once
#include "buffer.h"
#include "record.h"
typedef struct {
uint8_t* domain;
RecordType qtype;
uint16_t cls;
} Question;
void create_question(const char* domain, RecordType qtype, Question* question);
bool read_question(PacketBuffer* buffer, Question* question);
void write_question(PacketBuffer* buffer, Question* question);
void free_question(Question* question);
void print_question(Question* question);

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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#undef _POSIX_C_SOURCE
#include <stdio.h>
#include "record.h"
#include "buffer.h"
uint16_t record_to_id(RecordType type) {
switch (type) {
case A:
return 1;
case NS:
return 2;
case CNAME:
return 5;
case SOA:
return 6;
case PTR:
return 12;
case MX:
return 15;
case TXT:
return 16;
case AAAA:
return 28;
case SRV:
return 33;
case CAA:
return 257;
default:
return 0;
}
}
void record_from_id(uint16_t i, RecordType* type) {
switch (i) {
case 1:
*type = A;
break;
case 2:
*type = NS;
break;
case 5:
*type = CNAME;
break;
case 6:
*type = SOA;
break;
case 12:
*type = PTR;
break;
case 15:
*type = MX;
break;
case 16:
*type = TXT;
break;
case 28:
*type = AAAA;
break;
case 33:
*type = SRV;
break;
case 257:
*type = CAA;
break;
default:
*type = UNKOWN;
}
}
bool str_to_qtype(const char* qstr, RecordType* qtype) {
if (strcasecmp(qstr, "A") == 0) {
*qtype = A;
return true;
} else if (strcasecmp(qstr, "NS") == 0) {
*qtype = NS;
return true;
} else if (strcasecmp(qstr, "CNAME") == 0) {
*qtype = CNAME;
return true;
} else if (strcasecmp(qstr, "SOA") == 0) {
*qtype = SOA;
return true;
} else if (strcasecmp(qstr, "PTR") == 0) {
*qtype = PTR;
return true;
} else if (strcasecmp(qstr, "MX") == 0) {
*qtype = MX;
return true;
} else if (strcasecmp(qstr, "TXT") == 0) {
*qtype = TXT;
return true;
} else if (strcasecmp(qstr, "AAAA") == 0) {
*qtype = AAAA;
return true;
} else if (strcasecmp(qstr, "SRV") == 0) {
*qtype = SRV;
return true;
} else if (strcasecmp(qstr, "CAA") == 0) {
*qtype = CAA;
return true;
} else {
return false;
}
return false;
}
static void read_a_record(PacketBuffer* buffer, Record* record) {
ARecord data;
data.addr[0] = buffer_read(buffer);
data.addr[1] = buffer_read(buffer);
data.addr[2] = buffer_read(buffer);
data.addr[3] = buffer_read(buffer);
record->data.a = data;
}
static void read_ns_record(PacketBuffer* buffer, Record* record) {
NSRecord data;
buffer_read_qname(buffer, &data.host);
record->data.ns = data;
}
static void read_cname_record(PacketBuffer* buffer, Record* record) {
CNAMERecord data;
buffer_read_qname(buffer, &data.host);
record->data.cname = data;
}
static void read_soa_record(PacketBuffer* buffer, Record* record) {
SOARecord data;
buffer_read_qname(buffer, &data.mname);
buffer_read_qname(buffer, &data.nname);
data.serial = buffer_read_int(buffer);
data.refresh = buffer_read_int(buffer);
data.retry = buffer_read_int(buffer);
data.expire = buffer_read_int(buffer);
data.minimum = buffer_read_int(buffer);
record->data.soa = data;
}
static void read_ptr_record(PacketBuffer* buffer, Record* record) {
PTRRecord data;
buffer_read_qname(buffer, &data.pointer);
record->data.ptr = data;
}
static void read_mx_record(PacketBuffer* buffer, Record* record) {
MXRecord data;
data.priority = buffer_read_short(buffer);
buffer_read_qname(buffer, &data.host);
record->data.mx = data;
}
static void read_txt_record(PacketBuffer* buffer, Record* record) {
TXTRecord data;
data.len = 0;
data.text = malloc(sizeof(uint8_t*) * 2);
uint8_t capacity = 2;
uint8_t total = record->len;
while (1) {
if (data.len >= capacity) {
if (capacity >= 128) {
capacity = 255;
} else {
capacity *= 2;
}
data.text = realloc(data.text, sizeof(uint8_t*) * capacity);
}
buffer_read_string(buffer, &data.text[data.len]);
if(data.text[data.len][0] == 0) {
free(data.text[data.len]);
break;
}
data.len++;
total -= data.text[data.len - 1][0] + 1;
if (total == 0) break;
}
record->data.txt = data;
}
static void read_aaaa_record(PacketBuffer* buffer, Record* record) {
AAAARecord data;
for (int i = 0; i < 16; i++) {
data.addr[i] = buffer_read(buffer);
}
record->data.aaaa = data;
}
static void read_srv_record(PacketBuffer* buffer, Record* record) {
SRVRecord data;
data.priority = buffer_read_short(buffer);
data.weight = buffer_read_short(buffer);
data.port = buffer_read_short(buffer);
buffer_read_qname(buffer, &data.target);
record->data.srv = data;
}
static void read_caa_record(PacketBuffer* buffer, Record* record, int header_pos) {
CAARecord data;
data.flags = buffer_read(buffer);
data.length = buffer_read(buffer);
buffer_read_n(buffer, &data.tag, data.length);
int value_len = ((int)record->len) + header_pos - buffer_get_index(buffer);
buffer_read_n(buffer, &data.value, (uint8_t)value_len);
record->data.caa = data;
}
bool read_record(PacketBuffer* buffer, Record* record) {
buffer_read_qname(buffer, &record->domain);
uint16_t qtype_num = buffer_read_short(buffer);
record_from_id(qtype_num, &record->type);
record->cls = buffer_read_short(buffer);
record->ttl = buffer_read_int(buffer);
record->len = buffer_read_short(buffer);
int header_pos = buffer_get_index(buffer);
switch (record->type) {
case A:
read_a_record(buffer, record);
break;
case NS:
read_ns_record(buffer, record);
break;
case CNAME:
read_cname_record(buffer, record);
break;
case SOA:
read_soa_record(buffer, record);
break;
case PTR:
read_ptr_record(buffer, record);
break;
case MX:
read_mx_record(buffer, record);
break;
case TXT:
read_txt_record(buffer, record);
break;
case AAAA:
read_aaaa_record(buffer, record);
break;
case SRV:
read_srv_record(buffer, record);
break;
case CAA:
read_caa_record(buffer, record, header_pos);
break;
default:
buffer_step(buffer, record->len);
free(record->domain);
return false;
}
return true;
}
static void write_a_record(PacketBuffer* buffer, ARecord* data) {
buffer_write_short(buffer, 4);
buffer_write(buffer, data->addr[0]);
buffer_write(buffer, data->addr[1]);
buffer_write(buffer, data->addr[2]);
buffer_write(buffer, data->addr[3]);
}
static void write_ns_record(PacketBuffer* buffer, NSRecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write_qname(buffer, data->host);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_cname_record(PacketBuffer* buffer, CNAMERecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write_qname(buffer, data->host);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_soa_record(PacketBuffer* buffer, SOARecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write_qname(buffer, data->mname);
buffer_write_qname(buffer, data->nname);
buffer_write_int(buffer, data->serial);
buffer_write_int(buffer, data->refresh);
buffer_write_int(buffer, data->retry);
buffer_write_int(buffer, data->expire);
buffer_write_int(buffer, data->minimum);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_ptr_record(PacketBuffer* buffer, PTRRecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write_qname(buffer, data->pointer);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_mx_record(PacketBuffer* buffer, MXRecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write_short(buffer, data->priority);
buffer_write_qname(buffer, data->host);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_txt_record(PacketBuffer* buffer, TXTRecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
if(data->len == 0) {
return;
}
for(uint8_t i = 0; i < data->len; i++) {
buffer_write_string(buffer, data->text[i]);
}
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_aaaa_record(PacketBuffer* buffer, AAAARecord* data) {
buffer_write_short(buffer, 16);
for (int i = 0; i < 16; i++) {
buffer_write(buffer, data->addr[i]);
}
}
static void write_srv_record(PacketBuffer* buffer, SRVRecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write_short(buffer, data->priority);
buffer_write_short(buffer, data->weight);
buffer_write_short(buffer, data->port);
buffer_write_qname(buffer, data->target);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_caa_record(PacketBuffer* buffer, CAARecord* data) {
int pos = buffer_get_index(buffer);
buffer_write_short(buffer, 0);
buffer_write(buffer, data->flags);
buffer_write(buffer, data->length);
buffer_write_n(buffer, data->tag + 1, data->tag[0]);
buffer_write_n(buffer, data->value + 1, data->value[0]);
int size = buffer_get_index(buffer) - pos - 2;
buffer_set_uint16_t(buffer, (uint16_t)size, pos);
}
static void write_record_header(PacketBuffer* buffer, Record* record) {
buffer_write_qname(buffer, record->domain);
uint16_t id = record_to_id(record->type);
buffer_write_short(buffer, id);
buffer_write_short(buffer, record->cls);
buffer_write_int(buffer, record->ttl);
}
void write_record(PacketBuffer* buffer, Record* record) {
switch(record->type) {
case A:
write_record_header(buffer, record);
write_a_record(buffer, &record->data.a);
break;
case NS:
write_record_header(buffer, record);
write_ns_record(buffer, &record->data.ns);
break;
case CNAME:
write_record_header(buffer, record);
write_cname_record(buffer, &record->data.cname);
break;
case SOA:
write_record_header(buffer, record);
write_soa_record(buffer, &record->data.soa);
break;
case PTR:
write_record_header(buffer, record);
write_ptr_record(buffer, &record->data.ptr);
break;
case MX:
write_record_header(buffer, record);
write_mx_record(buffer, &record->data.mx);
break;
case TXT:
write_record_header(buffer, record);
write_txt_record(buffer, &record->data.txt);
break;
case AAAA:
write_record_header(buffer, record);
write_aaaa_record(buffer, &record->data.aaaa);
break;
case SRV:
write_record_header(buffer, record);
write_srv_record(buffer, &record->data.srv);
break;
case CAA:
write_record_header(buffer, record);
write_caa_record(buffer, &record->data.caa);
break;
default:
break;
}
}
void free_record(Record* record) {
free(record->domain);
switch (record->type) {
case NS:
free(record->data.ns.host);
break;
case CNAME:
free(record->data.cname.host);
break;
case SOA:
free(record->data.soa.mname);
free(record->data.soa.nname);
break;
case PTR:
free(record->data.ptr.pointer);
break;
case MX:
free(record->data.mx.host);
break;
case TXT:
for (uint8_t i = 0; i < record->data.txt.len; i++) {
free(record->data.txt.text[i]);
}
free(record->data.txt.text);
break;
case SRV:
free(record->data.srv.target);
break;
case CAA:
free(record->data.caa.value);
free(record->data.caa.tag);
break;
default:
break;
}
}
static const char* class_to_str(Record* record) {
switch(record->cls) {
case 1: return "IN";
case 3: return "CH";
case 4: return "HS";
default: return "??";
}
}
static const char* qtype_to_str(Record* record) {
switch(record->type) {
case A: return "A";
case NS: return "NS";
case CNAME: return "CNAME";
case SOA: return "SOA";
case PTR: return "PTR";
case MX: return "MX";
case TXT: return "TXT";
case AAAA: return "AAAA";
case SRV: return "SRV";
case CAA: return "CAA";
default: return "UNKOWN";
}
}
static void print_record_data(Record* record) {
switch(record->type) {
case A:
printf("%hhu.%hhu.%hhu.%hhu",
record->data.a.addr[0],
record->data.a.addr[1],
record->data.a.addr[2],
record->data.a.addr[3]
);
break;
case NS:
printf("%.*s",
record->data.ns.host[0],
record->data.ns.host + 1
);
break;
case CNAME:
printf("%.*s",
record->data.cname.host[0],
record->data.cname.host + 1
);
break;
case SOA:
printf("%.*s %.*s %u %u %u %u %u",
record->data.soa.mname[0],
record->data.soa.mname + 1,
record->data.soa.nname[0],
record->data.soa.nname + 1,
record->data.soa.serial,
record->data.soa.refresh,
record->data.soa.retry,
record->data.soa.expire,
record->data.soa.minimum
);
break;
case PTR:
printf("%.*s",
record->data.ptr.pointer[0],
record->data.ptr.pointer + 1
);
break;
case MX:
printf("%.*s %hu",
record->data.mx.host[0],
record->data.mx.host + 1,
record->data.mx.priority
);
break;
case TXT:
for(uint8_t i = 0; i < record->data.txt.len; i++) {
printf("%.*s",
record->data.txt.text[i][0],
record->data.txt.text[i] + 1
);
}
break;
case AAAA:
for(int i = 0; i < 8; i++) {
printf("%02hhx%02hhx:",
record->data.a.addr[i*2 + 0],
record->data.a.addr[i*2 + 1]
);
}
printf(":");
break;
case SRV:
printf("SRV (%hu %hu %hu %.*s",
record->data.srv.priority,
record->data.srv.weight,
record->data.srv.port,
record->data.srv.target[0],
record->data.srv.target + 1
);
break;
case CAA:
printf("%hhu %.*s %.*s",
record->data.caa.flags,
record->data.caa.tag[0],
record->data.caa.tag + 1,
record->data.caa.value[0],
record->data.caa.value + 1
);
break;
default:
break;
}
}
void print_record(Record* record) {
printf("%.*s.\t%s %s\t",
record->domain[0],
record->domain + 1,
class_to_str(record),
qtype_to_str(record)
);
print_record_data(record);
printf("\n");
}

108
src/packet/record.h Normal file
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@ -0,0 +1,108 @@
#pragma once
#include "buffer.h"
#include <string.h>
#include <stdbool.h>
typedef enum {
UNKOWN,
A, // 1
NS, // 2
CNAME, // 5
SOA, // 6
PTR, // 12
MX, // 15
TXT, // 16
AAAA, // 28
SRV, // 33
CAA // 257
} RecordType;
uint16_t record_to_id(RecordType type);
void record_from_id(uint16_t i, RecordType* type);
typedef struct {
uint8_t addr[4];
} ARecord;
typedef struct {
uint8_t* host;
} NSRecord;
typedef struct {
uint8_t* host;
} CNAMERecord;
typedef struct {
uint8_t* mname;
uint8_t* nname;
uint32_t serial;
uint32_t refresh;
uint32_t retry;
uint32_t expire;
uint32_t minimum;
} SOARecord;
typedef struct {
uint8_t* pointer;
} PTRRecord;
typedef struct {
uint16_t priority;
uint8_t* host;
} MXRecord;
typedef struct TXTRecord {
uint8_t** text;
uint8_t len;
} TXTRecord;
typedef struct {
uint8_t addr[16];
} AAAARecord;
typedef struct {
uint16_t priority;
uint16_t weight;
uint16_t port;
uint8_t* target;
} SRVRecord;
typedef struct {
uint8_t flags;
uint8_t length;
uint8_t* tag;
uint8_t* value;
} CAARecord;
typedef struct {
char* command;
} CMDRecord;
typedef struct {
uint32_t ttl;
uint16_t cls;
uint16_t len;
uint8_t* domain;
RecordType type;
union data {
ARecord a;
NSRecord ns;
CNAMERecord cname;
SOARecord soa;
PTRRecord ptr;
MXRecord mx;
TXTRecord txt;
AAAARecord aaaa;
SRVRecord srv;
CAARecord caa;
CMDRecord cmd;
} data;
} Record;
bool read_record(PacketBuffer* buffer, Record* record);
void write_record(PacketBuffer* buffer, Record* record);
void free_record(Record* record);
void print_record(Record* record);
bool str_to_qtype(const char* str, RecordType* type);