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https://code.semirocket.science/wrapsix
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Parsing and using configuration file
This commit is contained in:
parent
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4
.gitignore
vendored
4
.gitignore
vendored
@ -14,6 +14,10 @@ src/Makefile.in
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Makefile
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src/Makefile
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INSTALL
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src/autoconfig.h.in.in
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src/autoconfig.h.in
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src/autoconfig.h
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src/stamp-h1
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# build
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*.o
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16
README
16
README
@ -5,25 +5,17 @@ About
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-----
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WrapSix is a fast NAT64 implementation. You also need a DNS64 server (e.g. BIND).
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Before compiling, don't forget to configure Wrapsix in files src/wrapper.c and
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src/wrapper.h.
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Before compiling, don't forget to configure Wrapsix in files src/wrapper.c.
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Configuration
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-------------
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INTERFACE Interface on which WrapSix should operate, e.g. eth0.
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PREFIX NAT64 prefix; at least /96, the default is standard
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64:ff9b::/96. Input it without the information about prefix
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length, i.e. just 64:ff9b::.
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IPV4_ADDR IPv4 address which is dedicated for WrapSix and is not assigned
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to the host operating system.
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HOST_IPV6_ADDR IPv6 address which represents the host, i.e. which is assigned
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to the operating system. It's used in ICMP error messages.
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HOST_IPV4_ADDR IPv4 address which represents the host, i.e. which is assigned
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to the operating system. It's used in ICMP error messages.
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MTU Minimum MTU in your IPv6 network; default is 1280, but you can
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set it to a greater value (up to 1500).
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PACKET_BUFFER Size of a buffer for incoming packets; it's strongly recommended
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to leave its value as is (i.e. 1514).
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WrapSix uses configuration file wrapsix.conf from configuration directory set in
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"./configure" phase, which is by default /usr/local/etc.
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Installation
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------------
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@ -14,6 +14,7 @@ AC_CONFIG_FILES([
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src/Makefile
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])
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AC_CONFIG_MACRO_DIR([m4])
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AC_CONFIG_HEADER([src/autoconfig.h.in])
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###
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# Configuration options
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@ -26,11 +27,14 @@ AC_ARG_ENABLE([debug],
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if test "x$debug" = "xyes"; then
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AS_COMPILER_FLAGS(AM_CFLAGS, "-g -ggdb -O0 -pipe -pedantic -Wshadow -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -Wold-style-definition -Wdeclaration-after-statement -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-noreturn -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Winline -Wformat-nonliteral -Wformat-security -Wswitch-enum -Winit-self -Wmissing-include-dirs -Wundef -Waggregate-return -Wnested-externs -Wunsafe-loop-optimizations -Winvalid-pch")
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AC_DEFINE([DEBUG])
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AC_DEFINE([DEBUG], [], [Turn on debug mode])
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else
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AS_COMPILER_FLAGS(AM_CFLAGS, "-O2")
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fi
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AC_DEFINE([SYSCONFDIR], "--sysconfdir--", [Configuration files directory])
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###
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# Final commands
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###
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@ -1,7 +1,9 @@
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sbin_PROGRAMS = wrapsix
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wrapsix_SOURCES = \
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arp.c arp.h \
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autoconfig.h \
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checksum.c checksum.h \
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config.c config.h \
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ethernet.h \
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icmp.c icmp.h \
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ipv4.c ipv4.h \
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@ -14,3 +16,6 @@ wrapsix_SOURCES = \
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transmitter.c transmitter.h \
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udp.c udp.h \
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wrapper.c wrapper.h
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autoconfig.h:
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sed -e 's|--sysconfdir--|$(sysconfdir)|' autoconfig.h.in > autoconfig.h
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183
src/config.c
Normal file
183
src/config.c
Normal file
@ -0,0 +1,183 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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#include "log.h"
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#include "wrapper.h"
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#define SYNTAX_ERROR(file, line, pos, fatal) { \
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log_error("Syntax error in configuration file %s on " \
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"line %d, position %d", file, line, pos); \
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fclose(f); \
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if (fatal) { \
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exit(1); \
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} else { \
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return 1; \
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} \
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}
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#define C_DEFAULT_MTU 1280
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#define C_DEFAULT_INTERFACE "eth0"
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#define C_DEFAULT_PREFIX "64:ff9b::"
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/**
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* Configuration file parser.
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*
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* @param config_file Configuration file (with path) to parse
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* @param cmtu Pointer to variable where to save MTU
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* @param oto One-time configuration options (used only
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* locally to init other things)
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* @param init 0 or 1, whether or not to initialize
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* configuration with defaults
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*/
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int cfg_parse(const char *config_file, unsigned short *cmtu,
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struct s_cfg_opts *oto, unsigned char init)
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{
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FILE *f;
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unsigned int ln = 0;
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char c;
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unsigned short opt_len, wht_len, val_len;
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char tmp_opt[32], tmp_val[128];
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/* set defaults */
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*cmtu = C_DEFAULT_MTU;
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/* TODO: get automatically the first available interface */
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strncpy(oto->interface, C_DEFAULT_INTERFACE, sizeof(oto->interface));
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strncpy(oto->prefix, C_DEFAULT_PREFIX, sizeof(oto->prefix));
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oto->ipv4_address[0] = '\0';
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f = fopen(config_file, "r");
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if (f == NULL) {
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/* set defaults */
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log_warn("Configuration file %s doesn't exist, using defaults",
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config_file);
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if (init) {
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log_error("IPv4 address unconfigured! Exiting");
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exit(1);
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}
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return 0;
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}
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while (c = getc(f), !feof(f)) {
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ln++;
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/* comments */
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if (c == '#') {
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/* skip this line */
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while (c = getc(f), c != '\n');
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continue;
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}
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/* empty lines */
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if (c == '\n') {
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continue;
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}
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/* option is only of small letters */
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if (c < 'a' || c > 'z') {
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SYNTAX_ERROR(config_file, ln, 0, init);
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}
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/* read option */
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for (opt_len = 0; c != ' ' && c != '\t'; opt_len++,
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c = getc(f)) {
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if (feof(f) || !((c >= 'a' && c <= 'z') || c == '_' ||
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(c >= '0' && c <= '9'))) {
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SYNTAX_ERROR(config_file, ln, opt_len, init);
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}
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if (opt_len < 32 - 1) {
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tmp_opt[opt_len] = c;
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} else {
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SYNTAX_ERROR(config_file, ln, opt_len, init);
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}
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}
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tmp_opt[opt_len] = '\0';
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/* skip white space */
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for (wht_len = 0; c == ' ' || c == '\t'; wht_len++,
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c = getc(f)) {
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if (feof(f)) {
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SYNTAX_ERROR(config_file, ln, opt_len + wht_len,
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init);
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}
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}
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/* read value */
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for (val_len = 0; c != ' ' && c != '\t' && c != '\n'; val_len++,
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c = getc(f)) {
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if (feof(f)) {
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SYNTAX_ERROR(config_file, ln, opt_len, init);
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}
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if (val_len < 128 - 1) {
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tmp_val[val_len] = c;
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} else {
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SYNTAX_ERROR(config_file, ln, opt_len, init);
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}
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}
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tmp_val[val_len] = '\0';
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/* skip rest of this line */
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if (c != '\n') {
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while (c = getc(f), c != '\n');
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}
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/* recognize the option */
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if (!strcmp(tmp_opt, "mtu")) {
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*cmtu = atoi(tmp_val);
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if (*cmtu > MAX_MTU) {
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log_warn("MTU setting is over maximum (%d), "
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"falling to default value (%d)",
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MAX_MTU, C_DEFAULT_MTU);
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*cmtu = C_DEFAULT_MTU;
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}
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} else if (!strcmp(tmp_opt, "interface")) {
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strncpy(oto->interface, tmp_val, sizeof(oto->interface));
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} else if (!strcmp(tmp_opt, "prefix")) {
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strncpy(oto->prefix, tmp_val, sizeof(oto->prefix));
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} else if (!strcmp(tmp_opt, "ipv4_address")) {
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if (val_len < sizeof(oto->ipv4_address)) {
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strncpy(oto->ipv4_address, tmp_val, sizeof(oto->ipv4_address));
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} else {
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SYNTAX_ERROR(config_file, ln, opt_len + wht_len, init);
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}
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} else {
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log_error("Unknown configuration option");
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SYNTAX_ERROR(config_file, ln, 0, init);
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}
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}
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fclose(f);
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if (init && oto->ipv4_address[0] == '\0') {
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log_error("IPv4 address unconfigured! Exiting");
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exit(1);
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}
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return 0;
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}
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31
src/config.h
Normal file
31
src/config.h
Normal file
@ -0,0 +1,31 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CONFIG_H
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#define CONFIG_H
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struct s_cfg_opts {
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char interface[128];
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char prefix[128];
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char ipv4_address[16];
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};
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int cfg_parse(const char *config_file, unsigned short *cmtu,
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struct s_cfg_opts *oto, unsigned char init);
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#endif /* CONFIG_H */
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20
src/icmp.c
20
src/icmp.c
@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -64,7 +64,7 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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unsigned char *icmp_data;
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struct s_nat *connection;
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unsigned short orig_checksum;
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unsigned char packet[MTU + sizeof(struct s_ethernet)];
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unsigned char packet[PACKET_BUFFER];
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unsigned short new_len = sizeof(struct s_ethernet) +
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sizeof(struct s_ipv6);
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@ -119,15 +119,15 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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icmp->type = ICMPV6_ECHO_REPLY;
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/* copy the payload data */
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if (payload_size < MTU - sizeof(struct s_ipv6)) {
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if (payload_size < mtu - sizeof(struct s_ipv6)) {
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memcpy(&packet[new_len], payload, payload_size);
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icmp = (struct s_icmp *) &packet[new_len];
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new_len += payload_size;
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} else {
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memcpy(&packet[new_len], payload, MTU -
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memcpy(&packet[new_len], payload, mtu -
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sizeof(struct s_ipv6));
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icmp = (struct s_icmp *) &packet[new_len];
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new_len += MTU - sizeof(struct s_ipv6);
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new_len += mtu - sizeof(struct s_ipv6);
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}
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break;
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@ -174,9 +174,9 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
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if (ntohs(*icmp_extra_s) < 68) {
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*icmp_extra = htonl(
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*icmp_extra_s + 20 <
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MTU ? (unsigned int)
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mtu ? (unsigned int)
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*icmp_extra_s + 20 :
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MTU);
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(unsigned int) mtu);
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} else {
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/* RFC1191 */
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/* NOTE: >= would cause infinite
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@ -1063,10 +1063,10 @@ int sub_icmp4_error(unsigned char *payload, unsigned short payload_size,
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/* copy payload, aligned to MTU */
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/* we can afford to use full MTU instead of just 1280 B as admin
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* warrants this to us */
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if (payload_size > MTU + sizeof(struct s_ethernet) - *packet_len) {
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if (payload_size > mtu + sizeof(struct s_ethernet) - *packet_len) {
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memcpy(&packet[*packet_len], payload,
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MTU + sizeof(struct s_ethernet) - *packet_len);
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*packet_len = MTU;
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mtu + sizeof(struct s_ethernet) - *packet_len);
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*packet_len = mtu;
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} else {
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memcpy(&packet[*packet_len], payload, payload_size);
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*packet_len += payload_size;
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|
18
src/tcp.c
18
src/tcp.c
@ -1,6 +1,6 @@
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/*
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* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* 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
|
||||
@ -199,8 +199,8 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
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/* allocate enough memory for translated packet */
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if ((packet = (unsigned char *) malloc(
|
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payload_size > MTU - sizeof(struct s_ipv6) ?
|
||||
MTU + sizeof(struct s_ethernet) :
|
||||
payload_size > mtu - sizeof(struct s_ipv6) ?
|
||||
mtu + sizeof(struct s_ethernet) :
|
||||
sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
|
||||
payload_size)) == NULL) {
|
||||
log_error("Lack of free memory");
|
||||
@ -233,9 +233,9 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
connection->ipv6_port_src);
|
||||
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||||
/* fragment it or not? */
|
||||
if (payload_size > MTU - sizeof(struct s_ipv6)) {
|
||||
if (payload_size > mtu - sizeof(struct s_ipv6)) {
|
||||
/* 1st fragments' payload size must be 8-byte aligned */
|
||||
#define FRAGMENT_LEN (((MTU - sizeof(struct s_ipv6) - \
|
||||
#define FRAGMENT_LEN (((mtu - sizeof(struct s_ipv6) - \
|
||||
sizeof(struct s_ipv6_fragment)) / 8) * 8)
|
||||
|
||||
/* fill in missing IPv6 header fields */
|
||||
@ -341,9 +341,9 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
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||||
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/* allocate enough memory for translated packet */
|
||||
if ((packet = (unsigned char *) malloc(
|
||||
payload_size > MTU - sizeof(struct s_ipv6) -
|
||||
payload_size > mtu - sizeof(struct s_ipv6) -
|
||||
sizeof(struct s_ipv6_fragment) ?
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MTU + sizeof(struct s_ethernet) :
|
||||
mtu + sizeof(struct s_ethernet) :
|
||||
sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
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||||
sizeof(struct s_ipv6_fragment) + payload_size)) == NULL) {
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log_error("Lack of free memory");
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||||
@ -374,7 +374,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
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frag->id = htonl(htons(ip4->id));
|
||||
|
||||
/* fragment the fragment or not? */
|
||||
if (payload_size > MTU - sizeof(struct s_ipv6) -
|
||||
if (payload_size > mtu - sizeof(struct s_ipv6) -
|
||||
sizeof(struct s_ipv6_fragment)) {
|
||||
/* fill in missing IPv6 header fields */
|
||||
ip6->len = htons(FRAGMENT_LEN +
|
||||
@ -391,7 +391,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
|
||||
payload, FRAGMENT_LEN);
|
||||
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||||
/* send translated packet */
|
||||
transmit_raw(packet, sizeof(struct s_ethernet) + MTU);
|
||||
transmit_raw(packet, sizeof(struct s_ethernet) + mtu);
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||||
|
||||
/* create the second fragment */
|
||||
ip6->len = htons(payload_size +
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||||
|
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2013 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* 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
|
||||
@ -31,6 +31,10 @@
|
||||
#include <unistd.h> /* close */
|
||||
|
||||
#include "arp.h"
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "autoconfig.h"
|
||||
#endif /* HAVE_CONFIG_H */
|
||||
#include "config.h"
|
||||
#include "ethernet.h"
|
||||
#include "ipv4.h"
|
||||
#include "ipv6.h"
|
||||
@ -40,13 +44,11 @@
|
||||
#include "wrapper.h"
|
||||
|
||||
/* +++ CONFIGURATION +++ */
|
||||
#define INTERFACE "eth0"
|
||||
#define PREFIX "64:ff9b::"
|
||||
#define IPV4_ADDR "192.168.0.111"
|
||||
#define HOST_IPV6_ADDR "fd77::1:0:1"
|
||||
#define HOST_IPV4_ADDR "192.168.0.19"
|
||||
/* --- CONFIGURATION --- */
|
||||
|
||||
unsigned short mtu;
|
||||
|
||||
struct ifreq interface;
|
||||
struct s_mac_addr mac;
|
||||
@ -60,6 +62,8 @@ int process(char *packet);
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct s_cfg_opts cfg;
|
||||
|
||||
struct packet_mreq pmr;
|
||||
struct ethtool_value ethtool;
|
||||
|
||||
@ -72,6 +76,18 @@ int main(int argc, char **argv)
|
||||
|
||||
log_info(PACKAGE_STRING " is starting");
|
||||
|
||||
/* load configuration */
|
||||
if (argc == 1) {
|
||||
cfg_parse(SYSCONFDIR "/wrapsix.conf", &mtu, &cfg, 1);
|
||||
} else {
|
||||
cfg_parse(argv[1], &mtu, &cfg, 1);
|
||||
}
|
||||
|
||||
log_info("Using: interface %s", cfg.interface);
|
||||
log_info(" prefix %s", cfg.prefix);
|
||||
log_info(" MTU %d", mtu);
|
||||
log_info(" IPv4 address %s", cfg.ipv4_address);
|
||||
|
||||
/* initialize the socket for sniffing */
|
||||
if ((sniff_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) ==
|
||||
-1) {
|
||||
@ -80,9 +96,9 @@ int main(int argc, char **argv)
|
||||
}
|
||||
|
||||
/* get the interface */
|
||||
strncpy(interface.ifr_name, INTERFACE, IFNAMSIZ);
|
||||
strncpy(interface.ifr_name, cfg.interface, IFNAMSIZ);
|
||||
if (ioctl(sniff_sock, SIOCGIFINDEX, &interface) == -1) {
|
||||
log_error("Unable to get the interface");
|
||||
log_error("Unable to get the interface %s", cfg.interface);
|
||||
return 1;
|
||||
}
|
||||
|
||||
@ -128,10 +144,10 @@ int main(int argc, char **argv)
|
||||
inet_pton(AF_INET6, "ff02::1:ff00:0", &ndp_multicast_addr);
|
||||
|
||||
/* compute binary IPv6 address of WrapSix prefix */
|
||||
inet_pton(AF_INET6, PREFIX, &wrapsix_ipv6_prefix);
|
||||
inet_pton(AF_INET6, cfg.prefix, &wrapsix_ipv6_prefix);
|
||||
|
||||
/* compute binary IPv4 address of WrapSix */
|
||||
inet_pton(AF_INET, IPV4_ADDR, &wrapsix_ipv4_addr);
|
||||
inet_pton(AF_INET, cfg.ipv4_address, &wrapsix_ipv4_addr);
|
||||
|
||||
/* compute binary IPv6 address of WrapSix host */
|
||||
inet_pton(AF_INET6, HOST_IPV6_ADDR, &host_ipv6_addr);
|
||||
|
@ -1,6 +1,6 @@
|
||||
/*
|
||||
* WrapSix
|
||||
* Copyright (C) 2008-2012 Michal Zima <xhire@mujmalysvet.cz>
|
||||
* Copyright (C) 2008-2013 xHire <xhire@wrapsix.org>
|
||||
*
|
||||
* 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
|
||||
@ -22,11 +22,12 @@
|
||||
#include "ipv4.h"
|
||||
#include "ipv6.h"
|
||||
|
||||
/* +++ CONFIGURE +++ */
|
||||
#define MTU 1280 /* MTU on IPv6 side */
|
||||
/* +++ INTERNAL CONFIGURATION +++ */
|
||||
#define MAX_MTU 1500 /* maximum MTU on IPv6 side */
|
||||
#define PACKET_BUFFER 1514 /* buffer for any packet */
|
||||
/* --- CONFIGURE --- */
|
||||
/* --- INTERNAL CONFIGURATION --- */
|
||||
|
||||
extern unsigned short mtu;
|
||||
extern struct ifreq interface;
|
||||
extern struct s_mac_addr mac;
|
||||
extern struct s_ipv6_addr ndp_multicast_addr;
|
||||
|
Loading…
Reference in New Issue
Block a user