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mirror of https://code.semirocket.science/wrapsix synced 2024-11-10 00:01:01 +02:00

Purely forwarding DNS proxy

Specified many CFLAGS
Corrected configure.in
This commit is contained in:
Michal Zima 2009-12-03 23:05:16 +01:00
parent 53e0e90ad5
commit 074476e7b6
4 changed files with 157 additions and 2 deletions

8
.gitignore vendored
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@ -5,6 +5,7 @@ configure
depcomp depcomp
install-sh install-sh
missing missing
config.cache
config.log config.log
config.status config.status
src/.deps/ src/.deps/
@ -13,3 +14,10 @@ src/Makefile.in
Makefile Makefile
src/Makefile src/Makefile
INSTALL INSTALL
# build
*.o
wrapsix-dnsproxy
# debug
core

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@ -1,7 +1,11 @@
AC_INIT([WrapSix], [0.1.99.0], [xhire@mujmalysvet.cz]) AC_INIT([WrapSix], [0.1.99.0], [xhire@mujmalysvet.cz])
AM_INIT_AUTOMAKE([-Wall -Werror]) AM_INIT_AUTOMAKE([-Wall -Werror])
AC_PROG_CC AC_PROG_CC
AC_OUTPUT([ AC_CONFIG_FILES([
Makefile Makefile
src/Makefile src/Makefile
]) ])
CFLAGS="-g -ggdb -O0 -pipe -Wall -Wshadow -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -Wold-style-definition -Wdeclaration-after-statement -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wmissing-noreturn -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Winline -Wformat-nonliteral -Wformat-security -Wswitch-enum -Wswitch-default -Winit-self -Wmissing-include-dirs -Wundef -Waggregate-return -Wmissing-format-attribute -Wnested-externs -Wunsafe-loop-optimizations"
AC_OUTPUT

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@ -1,2 +1,2 @@
bin_PROGRAMS = wrapsix-dnsproxy sbin_PROGRAMS = wrapsix-dnsproxy
wrapsix_dnsproxy_SOURCES = dnsproxy.c wrapsix_dnsproxy_SOURCES = dnsproxy.c

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@ -0,0 +1,143 @@
/*
* WrapSix
* Copyright (C) 2008-2009 Michal Zima <xhire@mujmalysvet.cz>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h> /* inet_pton */
#include <unistd.h> /* close */
#include <string.h> /* memcpy */
#define BUFFER_SIZE 512 /* maximum of a DNS packet */
#define IP "::2"
#define RESOLVER "::1"
#define PORT 53
int resolver_connect(int *sock, struct sockaddr_in6 *sock_addr);
int udp_receive(int *sock, struct sockaddr_in6 *sock_addr, char *buffer, int *length);
int udp_send(int *sock, struct sockaddr_in6 *sock_addr, char *data, int length);
int resolver_connect(int *sock, struct sockaddr_in6 *sock_addr)
{
int tmp_sock;
struct sockaddr_in6 tmp_sock_addr;
char resolver[] = RESOLVER;
/* create a socket */
if ((tmp_sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
fprintf(stderr, "[Error] Unable to create UDP socket for outgoing connections\n");
return 1;
}
/* setup the socket */
tmp_sock_addr.sin6_family = AF_INET6;
tmp_sock_addr.sin6_port = htons(PORT);
inet_pton(AF_INET6, (char *) &resolver, &(tmp_sock_addr.sin6_addr));
/* return correct data */
memcpy(sock, &tmp_sock, sizeof(int));
memcpy(sock_addr, &tmp_sock_addr, sizeof(struct sockaddr_in6));
return 0;
}
int udp_receive(int *sock, struct sockaddr_in6 *sock_addr, char *buffer, int *length)
{
int tmp_length;
int addrlen;
addrlen = sizeof(struct sockaddr_in6);
if ((tmp_length = recvfrom(*sock, buffer, BUFFER_SIZE, 0, (struct sockaddr *) sock_addr, (socklen_t *) &addrlen)) == -1) {
char str_ip[128];
inet_ntop(AF_INET6, &(sock_addr->sin6_addr), (char *) &str_ip, 128);
fprintf(stderr, "[Error] Unable to read from UDP socket [%s]:%d\n", str_ip, PORT);
return 1;
}
memcpy(length, &tmp_length, sizeof(int));
return 0;
}
int udp_send(int *sock, struct sockaddr_in6 *sock_addr, char *data, int length)
{
int addrlen;
addrlen = sizeof(struct sockaddr_in6);
if (sendto(*sock, data, length, 0, (struct sockaddr *) sock_addr, addrlen) != length) {
char str_ip[128];
inet_ntop(AF_INET6, &(sock_addr->sin6_addr), (char *) &str_ip, 128);
fprintf(stderr, "[Error] Unable to write to UDP socket [%s]:%d\n", str_ip, PORT);
return 1;
}
return 0;
}
int main(int argc, char **argv)
{
int length;
char ip[] = IP;
char buffer[BUFFER_SIZE];
int sock;
struct sockaddr_in6 sock_addr,
client_sock_addr;
int resolver_sock;
struct sockaddr_in6 resolver_sock_addr;
/* create the socket */
if ((sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
fprintf(stderr, "[Error] Unable to create UDP socket\n");
return 1;
}
/* setup the socket */
sock_addr.sin6_family = AF_INET6;
sock_addr.sin6_port = htons(PORT);
inet_pton(AF_INET6, (char *) &ip, &(sock_addr.sin6_addr));
/* bind the socket to address and port */
if (bind(sock, (struct sockaddr *) &(sock_addr), sizeof(sock_addr)) == -1) {
fprintf(stderr, "[Error] Unable to bind UDP socket to %s:%d\n", IP, PORT);
return 1;
}
/* fetch a request */
udp_receive(&sock, &client_sock_addr, (char *) &buffer, &length);
/* forward it to resolver */
resolver_connect(&resolver_sock, &resolver_sock_addr);
udp_send(&resolver_sock, &resolver_sock_addr, (char *) &buffer, length);
/* fetch the answer and forward it to the client */
udp_receive(&resolver_sock, &resolver_sock_addr, (char *) &buffer, (int *) &length);
udp_send(&sock, &client_sock_addr, (char *) &buffer, length);
/* clean-up */
close(resolver_sock);
/* final clean-up */
close(sock);
return 0;
}