arti/wrapsix
1
0
Fork 0
mirror of https://code.semirocket.science/wrapsix synced 2024-11-23 22:55:55 +02:00
Code

Specialized logging functions; can control debug

Browse Source
This commit is contained in:
Michal Zima 2012-07-04 11:37:42 +02:00
parent fbbf20ba0a
commit 34025797b1
15 changed files with 254 additions and 104 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
configure.ac
View File

@ -1,11 +1,36 @@
AC_INIT([WrapSix], [0.1.99.0], [xhire@mujmalysvet.cz])
AM_INIT_AUTOMAKE([-Wall -Werror])
# prevent automatic adding of "-g -O2" to CFLAGS
OLD_CFLAGS=$CFLAGS
AC_PROG_CC
CFLAGS=$OLD_CFLAGS
AC_CONFIG_FILES([
Makefile
src/Makefile
])
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 -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"
###
# Configuration options
###
AC_ARG_ENABLE([debug],
AS_HELP_STRING([--enable-debug], [enable debugging]),
[debug=$enableval],
[debug=no])
if test "x$debug" = "xyes"; then
AM_CFLAGS="${AM_CFLAGS} -g -ggdb -O0 -pipe -pedantic -Wshadow -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter -Wold-style-definition -Wdeclaration-after-statement -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wshadow -Wpointer-arith -Wcast-align -Wwrite-strings -Winline -Wformat-nonliteral -Wformat-security -Wswitch-enum -Wswitch-default -Winit-self -Wmissing-include-dirs -Wundef -Waggregate-return -Wnested-externs -Wunsafe-loop-optimizations"
AC_DEFINE([DEBUG])
else
AM_CFLAGS="${AM_CFLAGS} -O2"
fi
###
# Final commands
###
AC_SUBST([AM_CFLAGS])
AC_OUTPUT

1
src/Makefile.am
View File

@ -7,6 +7,7 @@ wrapsix_wrapper_SOURCES = \
icmp.c icmp.h \
ipv4.c ipv4.h \
ipv6.c ipv6.h \
log.c log.h \
nat.c nat.h \
radixtree.c radixtree.h \
tcp.c tcp.h \

10
src/arp.c
View File

@ -18,11 +18,11 @@
#include <net/ethernet.h> /* ETHERTYPE_* */
#include <netinet/in.h> /* htons */
#include <stdio.h>
#include <stdlib.h> /* malloc */
#include <string.h> /* memcmp, memset */
#include "arp.h"
#include "log.h"
#include "transmitter.h"
#include "wrapper.h"
@ -32,8 +32,8 @@
* @param ethq Ethernet header of the packet
* @param payload Data of the packet
*
* @return 0 for success
* @return 1 for failure
* @return 0 for success
* @return 1 for failure
*/
int arp(struct s_ethernet *ethq, char *payload)
{
@ -51,7 +51,7 @@ int arp(struct s_ethernet *ethq, char *payload)
/* test if this packet belongs to us */
if (memcmp(&wrapsix_ipv4_addr, &arpq->ip_dest, 4)) {
printf("[Debug] This is unfamiliar packet\n");
log_debug("This is unfamiliar ARP packet");
return 1;
}
@ -60,7 +60,7 @@ int arp(struct s_ethernet *ethq, char *payload)
/* allocate enough memory */
if ((packet = (unsigned char *) malloc(ARP_PACKET_SIZE)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
memset(packet, 0x0, ARP_PACKET_SIZE);

18
src/checksum.c
View File

@ -17,13 +17,13 @@
*/
#include <netinet/in.h> /* htonl */
#include <stdio.h>
#include <stdlib.h> /* malloc */
#include <string.h> /* memcpy */
#include "checksum.h"
#include "ipv4.h"
#include "ipv6.h"
#include "log.h"
/**
* General checksum computation function
@ -31,7 +31,7 @@
* @param data Pointer to data of which to compute the checksum
* @param length Length of the data (in bytes)
*
* @return Checksum
* @return Checksum
*/
unsigned short checksum(const void *data, int length)
{
@ -76,7 +76,7 @@ unsigned short checksum(const void *data, int length)
* number of octets
* @param new_len Length of new data
*
* @return Updated checksum
* @return Updated checksum
*/
unsigned short checksum_update(unsigned short old_sum,
unsigned short *old_data, short old_len,
@ -116,7 +116,7 @@ unsigned short checksum_update(unsigned short old_sum,
* @param proto Protocol in the payload
* @param payload Pointer to payload data
*
* @return Checksum
* @return Checksum
*/
unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
struct s_ipv4_addr ip_dest,
@ -128,7 +128,7 @@ unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
unsigned short sum;
if ((buffer = malloc(sizeof(struct s_ipv4_pseudo) + length)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 0;
}
@ -158,7 +158,7 @@ unsigned short checksum_ipv4(struct s_ipv4_addr ip_src,
* @param proto Protocol in the payload
* @param payload Pointer to payload data
*
* @return Checksum
* @return Checksum
*/
unsigned short checksum_ipv6(struct s_ipv6_addr ip_src,
struct s_ipv6_addr ip_dest,
@ -170,7 +170,7 @@ unsigned short checksum_ipv6(struct s_ipv6_addr ip_src,
unsigned short sum;
if ((buffer = malloc(sizeof(struct s_ipv6_pseudo) + length)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 0;
}
@ -202,7 +202,7 @@ unsigned short checksum_ipv6(struct s_ipv6_addr ip_src,
* @param ip4_dest New destination IPv4 address
* @param new_port New transport layer address (port)
*
* @return Checksum
* @return Checksum
*/
unsigned short checksum_ipv4_update(unsigned short old_sum,
struct s_ipv6_addr ip6_src,
@ -241,7 +241,7 @@ unsigned short checksum_ipv4_update(unsigned short old_sum,
* @param ip6_dest New destination IPv6 address
* @param new_port New transport layer address (port)
*
* @return Checksum
* @return Checksum
*/
unsigned short checksum_ipv6_update(unsigned short old_sum,
struct s_ipv4_addr ip4_src,

30
src/icmp.c
View File

@ -18,13 +18,13 @@
#include <net/ethernet.h> /* ETHERTYPE_* */
#include <netinet/in.h> /* htons */
#include <stdio.h>
#include <stdlib.h> /* malloc */
#include <string.h> /* memcpy, memset */
#include "checksum.h"
#include "icmp.h"
#include "ipv6.h"
#include "log.h"
#include "nat.h"
#include "transmitter.h"
#include "wrapper.h"
@ -65,7 +65,7 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
if (icmp->checksum != orig_checksum) {
/* packet is corrupted and shouldn't be processed */
printf("[Debug] Wrong checksum\n");
log_debug("Wrong checksum");
return 1;
}
@ -81,8 +81,8 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
0, echo->id);
if (connection == NULL) {
printf("[Debug] Incoming connection wasn't "
"found in NAT\n");
log_debug("Incoming connection wasn't found in "
"NAT");
return 1;
}
@ -94,8 +94,8 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
break;
default:
printf("[Debug] ICMPv4 Type: unknown [%d/0x%x]\n",
icmp->type, icmp->type);
log_debug("ICMPv4 Type: unknown [%d/0x%x]",
icmp->type, icmp->type);
return 1;
}
@ -103,7 +103,7 @@ int icmp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4,
if ((packet = (unsigned char *) malloc(sizeof(struct s_ethernet) +
sizeof(struct s_ipv6) +
payload_size)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
eth6 = (struct s_ethernet *) packet;
@ -177,7 +177,7 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
if (icmp->checksum != orig_checksum) {
/* packet is corrupted and shouldn't be processed */
printf("[Debug] Wrong checksum\n");
log_debug("Wrong checksum");
return 1;
}
@ -192,8 +192,8 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
echo->id, 0);
if (connection == NULL) {
printf("[Debug] Error! Outgoing connection "
"wasn't found/created in NAT!\n");
log_warn("Outgoing connection wasn't "
"found/created in NAT!");
return 1;
}
@ -213,15 +213,15 @@ int icmp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
(struct s_icmp_ndp_ns *) icmp_data);
default:
printf("[Debug] ICMPv6 Type: unknown [%d/0x%x]\n",
icmp->type, icmp->type);
log_debug("ICMPv6 Type: unknown [%d/0x%x]",
icmp->type, icmp->type);
return 1;
}
/* allocate memory for translated packet */
if ((packet = (unsigned char *) malloc(sizeof(struct s_ipv4) +
htons(ip6->len))) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
ip4 = (struct s_ipv4 *) packet;
@ -280,7 +280,7 @@ int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
/* first check whether the request belongs to us */
if (memcmp(&wrapsix_ipv6_prefix, &ndp_ns->target, 12) != 0) {
printf("[Debug] [NDP] This is unfamiliar packet\n");
log_debug("This is unfamiliar NDP packet");
return 1;
}
@ -290,7 +290,7 @@ int icmp_ndp(struct s_ethernet *ethq, struct s_ipv6 *ipq,
sizeof(struct s_icmp) + \
sizeof(struct s_icmp_ndp_na)
if ((packet = (unsigned char *) malloc(NDP_PACKET_SIZE)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
memset(packet, 0x0, NDP_PACKET_SIZE);

14
src/ipv4.c
View File

@ -17,11 +17,11 @@
*/
#include <netinet/in.h> /* IPPROTO_* */
#include <stdio.h>
#include <string.h> /* memcmp */
#include "icmp.h"
#include "ipv4.h"
#include "log.h"
#include "tcp.h"
#include "udp.h"
#include "wrapper.h"
@ -47,7 +47,7 @@ int ipv4(struct s_ethernet *eth, char *packet)
/* test if this packet belongs to us */
if (memcmp(&wrapsix_ipv4_addr, &ip->ip_dest, 4) != 0) {
printf("[Debug] [IPv4] This is unfamiliar packet\n");
log_debug("This is unfamiliar IPv4 packet");
return 1;
}
@ -58,17 +58,17 @@ int ipv4(struct s_ethernet *eth, char *packet)
switch (ip->proto) {
case IPPROTO_TCP:
printf("[Debug] IPv4 Protocol: TCP\n");
log_debug("IPv4 Protocol: TCP");
return tcp_ipv4(eth, ip, payload, data_size);
case IPPROTO_UDP:
printf("[Debug] IPv4 Protocol: UDP\n");
log_debug("IPv4 Protocol: UDP");
return udp_ipv4(eth, ip, payload, data_size);
case IPPROTO_ICMP:
printf("[Debug] IPv4 Protocol: ICMP\n");
log_debug("IPv4 Protocol: ICMP");
return icmp_ipv4(eth, ip, payload, data_size);
default:
printf("[Debug] IPv4 Protocol: unknown [%d/0x%x]\n",
ip->proto, ip->proto);
log_debug("IPv4 Protocol: unknown [%d/0x%x]",
ip->proto, ip->proto);
return 1;
}
}

14
src/ipv6.c
View File

@ -17,11 +17,11 @@
*/
#include <netinet/in.h> /* IPPROTO_* */
#include <stdio.h>
#include <string.h> /* memcmp */
#include "icmp.h"
#include "ipv6.h"
#include "log.h"
#include "tcp.h"
#include "udp.h"
#include "wrapper.h"
@ -47,23 +47,23 @@ int ipv6(struct s_ethernet *eth, char *packet)
/* test if this packet belongs to us */
if (memcmp(&wrapsix_ipv6_prefix, &ip->ip_dest, 12) != 0 &&
memcmp(&ndp_multicast_addr, &ip->ip_dest, 13) != 0) {
printf("[Debug] [IPv6] This is unfamiliar packet\n");
log_debug("This is unfamiliar IPv6 packet");
return 1;
}
switch (ip->next_header) {
case IPPROTO_TCP:
printf("[Debug] IPv6 Protocol: TCP\n");
log_debug("IPv6 Protocol: TCP");
return tcp_ipv6(eth, ip, payload);
case IPPROTO_UDP:
printf("[Debug] IPv6 Protocol: UDP\n");
log_debug("IPv6 Protocol: UDP");
return udp_ipv6(eth, ip, payload);
case IPPROTO_ICMPV6:
printf("[Debug] IPv6 Protocol: ICMP\n");
log_debug("IPv6 Protocol: ICMP");
return icmp_ipv6(eth, ip, payload);
default:
printf("[Debug] IPv6 Protocol: unknown [%d/0x%x]\n",
ip->next_header, ip->next_header);
log_debug("IPv6 Protocol: unknown [%d/0x%x]",
ip->next_header, ip->next_header);
return 1;
}
}

100
src/log.c Normal file
View File

@ -0,0 +1,100 @@
/*
* WrapSix
* Copyright (C) 2008-2012 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 <stdarg.h>
#include <stdio.h>
#include "log.h"
/**
* Logs debugging stuff to stdout, but only when compiled with debug enabled.
*
* @param msg Formatted message
* @param ... Parameters to be included in the message
*/
void log_debug(const char *msg, ...)
{
#ifdef DEBUG
va_list args;
fprintf(stdout, "[Debug] ");
va_start(args, msg);
vfprintf(stdout, msg, args);
va_end(args);
fprintf(stdout, "\n");
#endif /* DEBUG */
}
/**
* Logs information to stdout.
*
* @param msg Formatted message
* @param ... Parameters to be included in the message
*/
void log_info(const char *msg, ...)
{
va_list args;
fprintf(stdout, "[Info] ");
va_start(args, msg);
vfprintf(stdout, msg, args);
va_end(args);
fprintf(stdout, "\n");
}
/**
* Logs warnings to stderr.
*
* @param msg Formatted message
* @param ... Parameters to be included in the message
*/
void log_warn(const char *msg, ...)
{
va_list args;
fprintf(stderr, "[Warning] ");
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, "\n");
}
/**
* Logs errors to stderr.
*
* @param msg Formatted message
* @param ... Parameters to be included in the message
*/
void log_error(const char *msg, ...)
{
va_list args;
fprintf(stderr, "[Error] ");
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, "\n");
}

27
src/log.h Normal file
View File

@ -0,0 +1,27 @@
/*
* WrapSix
* Copyright (C) 2008-2012 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/>.
*/
#ifndef LOG_H
#define LOG_H
void log_debug(const char *msg, ...);
void log_info(const char *msg, ...);
void log_warn(const char *msg, ...);
void log_error(const char *msg, ...);
#endif /* LOG_H */

6
src/nat.c
View File

@ -16,13 +16,13 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h> /* malloc */
#include <time.h> /* time */
#include "ethernet.h"
#include "ipv4.h"
#include "ipv6.h"
#include "log.h"
#include "nat.h"
#include "radixtree.h"
#include "wrapper.h"
@ -120,7 +120,7 @@ struct s_nat *nat_out(radixtree_t *nat_proto6, radixtree_t *nat_proto4,
/* if no connection is found, let's create one */
if ((connection =
(struct s_nat *) malloc(sizeof(struct s_nat))) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return NULL;
}
@ -198,7 +198,7 @@ struct s_nat *nat_in(radixtree_t *nat_proto4, struct s_ipv4_addr ipv4_src,
* @param id Fragment identification
* @param nat Connection to save
*
* @return Connection
* @return Connection
*/
struct s_nat *nat_in_fragments(radixtree_t *nat_proto4,
struct s_ipv4_addr ipv4_src,

8
src/radixtree.c
View File

@ -16,10 +16,10 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h> /* fprintf */
#include <stdlib.h> /* free, malloc */
#include <string.h> /* memcpy */
#include "log.h"
#include "radixtree.h"
/**
@ -32,7 +32,7 @@ radixtree_t *radixtree_create(void)
radixtree_t *radixtree;
if ((radixtree = (radixtree_t *) malloc(sizeof(radixtree_t))) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return NULL;
}
memset(radixtree, 0, sizeof(radixtree_t));
@ -207,7 +207,7 @@ void *radixtree_lookup(radixtree_t *root,
* @param count Variable into which is put information about number of
* chunks produced
*
* @return Array of chunks
* @return Array of chunks
*/
unsigned char *radixtree_chunker(void *data, unsigned char size, unsigned char *count)
{
@ -220,7 +220,7 @@ unsigned char *radixtree_chunker(void *data, unsigned char size, unsigned char *
memcpy(count, &counter, sizeof(unsigned char));
if ((chunks = (unsigned char *) malloc(counter * sizeof(unsigned char))) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return NULL;
}

24
src/tcp.c
View File

@ -18,7 +18,6 @@
#include <net/ethernet.h> /* ETHERTYPE_* */
#include <netinet/in.h> /* htons */
#include <stdio.h>
#include <stdlib.h> /* malloc */
#include <string.h> /* memcpy */
@ -26,6 +25,7 @@
#include "ethernet.h"
#include "ipv4.h"
#include "ipv6.h"
#include "log.h"
#include "nat.h"
#include "tcp.h"
#include "transmitter.h"
@ -78,7 +78,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
if (tcp->checksum != orig_checksum) {
/* packet is corrupted and shouldn't be
* processed */
printf("[Debug] Wrong checksum\n");
log_debug("Wrong checksum");
return 1;
}
}
@ -88,8 +88,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
tcp->port_src, tcp->port_dest);
if (connection == NULL) {
printf("[Debug] Incoming connection wasn't found in "
"NAT\n");
log_debug("Incoming connection wasn't found in NAT");
return 1;
}
@ -105,7 +104,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
MTU + sizeof(struct s_ethernet) :
sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
payload_size)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
eth6 = (struct s_ethernet *) packet;
@ -201,8 +200,8 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
ip4->id, NULL);
if (connection == NULL) {
printf("[Debug] Incoming connection wasn't found in "
"fragments table\n");
log_debug("Incoming connection wasn't found in "
"fragments table");
return 1;
}
@ -213,7 +212,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
MTU + sizeof(struct s_ethernet) :
sizeof(struct s_ethernet) + sizeof(struct s_ipv6) +
sizeof(struct s_ipv6_fragment) + payload_size)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
eth6 = (struct s_ethernet *) packet;
@ -311,7 +310,7 @@ int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
/* if this is the last fragment, remove the entry from table */
if (!(ip4->flags_offset & htons(IPV4_FLAG_MORE_FRAGMENTS))) {
printf("[Debug] Removing fragment entry\n");
log_debug("Removing fragment entry");
nat_in_fragments_cleanup(nat4_tcp_fragments,
ip4->ip_src, ip4->id);
}
@ -354,7 +353,7 @@ int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
if (tcp->checksum != orig_checksum) {
/* packet is corrupted and shouldn't be processed */
printf("[Debug] Wrong checksum\n");
log_debug("Wrong checksum");
return 1;
}
@ -364,15 +363,14 @@ int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
tcp->port_src, tcp->port_dest);
if (connection == NULL) {
printf("[Debug] Error! Outgoing connection wasn't "
"found/created in NAT!\n");
log_warn("Outgoing connection wasn't found/created in NAT");
return 1;
}
/* allocate memory for translated packet */
if ((packet = (unsigned char *) malloc(sizeof(struct s_ipv4) +
htons(ip6->len))) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
ip4 = (struct s_ipv4 *) packet;

36
src/transmitter.c
View File

@ -22,11 +22,12 @@
* sendto */
#include <netinet/in.h> /* htons */
#include <netpacket/packet.h> /* sockaddr_ll, PACKET_OTHERHOST */
#include <stdio.h> /* fprintf, stderr, perror */
#include <stdio.h> /* perror */
#include <string.h> /* memcpy */
#include <unistd.h> /* close */
#include "ipv4.h"
#include "log.h"
#include "transmitter.h"
#include "wrapper.h"
@ -38,8 +39,8 @@ int sock, sock_ipv4;
* Initialize sockets and all needed properties. Should be called only once on
* program startup.
*
* @return 0 for success
* @return 1 for failure
* @return 0 for success
* @return 1 for failure
*/
int transmission_init(void)
{
@ -54,7 +55,7 @@ int transmission_init(void)
/* initialize RAW socket */
if ((sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) == -1) {
fprintf(stderr, "[Error] Couldn't open RAW socket.\n");
log_error("Couldn't open RAW socket.");
perror("socket()");
return 1;
}
@ -62,8 +63,7 @@ int transmission_init(void)
/* bind the socket to the interface */
if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &interface,
sizeof(struct ifreq)) == -1) {
fprintf(stderr, "[Error] Couldn't bind the socket to the "
"interface.\n");
log_error("Couldn't bind the socket to the interface.");
perror("setsockopt()");
return 1;
}
@ -76,7 +76,7 @@ int transmission_init(void)
/* initialize RAW IPv4 socket */
if ((sock_ipv4 = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) == -1) {
fprintf(stderr, "[Error] Couldn't open RAW IPv4 socket.\n");
log_error("Couldn't open RAW IPv4 socket.");
perror("socket()");
return 1;
}
@ -84,8 +84,7 @@ int transmission_init(void)
/* we will provide our own IPv4 header */
if (setsockopt(sock_ipv4, IPPROTO_IP, IP_HDRINCL, &on,
sizeof(on)) == -1) {
fprintf(stderr, "[Error] Couldn't apply the socket "
"settings.\n");
log_error("Couldn't apply the socket settings.");
perror("setsockopt()");
return 1;
}
@ -96,15 +95,14 @@ int transmission_init(void)
/**
* Close sockets. Should be called only once on program shutdown.
*
* @return 0 for success
* @return 1 for failure
* @return 0 for success
* @return 1 for failure
*/
int transmission_quit(void)
{
/* close the socket */
if (close(sock) || close(sock_ipv4)) {
fprintf(stderr, "[Error] Couldn't close the transmission "
"sockets.\n");
log_warn("Couldn't close the transmission sockets.");
perror("close()");
return 1;
} else {
@ -118,14 +116,14 @@ int transmission_quit(void)
* @param data Raw packet data, including ethernet header
* @param length Length of the whole packet in bytes
*
* @return 0 for success
* @return 1 for failure
* @return 0 for success
* @return 1 for failure
*/
int transmit_raw(unsigned char *data, unsigned int length)
{
if (sendto(sock, data, length, 0, (struct sockaddr *) &socket_address,
sizeof(struct sockaddr_ll)) != (int) length) {
fprintf(stderr, "[Error] Couldn't send a RAW packet.\n");
log_error("Couldn't send a RAW packet.");
perror("sendto()");
return 1;
}
@ -141,8 +139,8 @@ int transmit_raw(unsigned char *data, unsigned int length)
* including IPv4 header
* @param length Length of the whole packet in bytes
*
* @return 0 for success
* @return 1 for failure
* @return 0 for success
* @return 1 for failure
*/
int transmit_ipv4(struct s_ipv4_addr *ip, unsigned char *data,
unsigned int length)
@ -154,7 +152,7 @@ int transmit_ipv4(struct s_ipv4_addr *ip, unsigned char *data,
if (sendto(sock_ipv4, data, length, 0,
(struct sockaddr *) &socket_address_ipv4,
sizeof(struct sockaddr)) != (int) length) {
fprintf(stderr, "[Error] Couldn't send an IPv4 packet.\n");
log_error("Couldn't send an IPv4 packet.");
perror("sendto()");
return 1;
}

15
src/udp.c
View File

@ -18,7 +18,6 @@
#include <net/ethernet.h> /* ETHERTYPE_* */
#include <netinet/in.h> /* htons */
#include <stdio.h>
#include <stdlib.h> /* malloc */
#include <string.h> /* memcpy */
@ -26,6 +25,7 @@
#include "ethernet.h"
#include "ipv4.h"
#include "ipv6.h"
#include "log.h"
#include "nat.h"
#include "transmitter.h"
#include "udp.h"
@ -68,7 +68,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
if (udp->checksum != orig_checksum) {
/* packet is corrupted and shouldn't be processed */
printf("[Debug] Wrong checksum\n");
log_debug("Wrong checksum");
return 1;
}
}
@ -77,7 +77,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
connection = nat_in(nat4_udp, ip4->ip_src, udp->port_src, udp->port_dest);
if (connection == NULL) {
printf("[Debug] Incoming connection wasn't found in NAT\n");
log_debug("Incoming connection wasn't found in NAT");
return 1;
}
@ -85,7 +85,7 @@ int udp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
if ((packet = (unsigned char *) malloc(sizeof(struct s_ethernet) +
sizeof(struct s_ipv6) +
payload_size)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
eth6 = (struct s_ethernet *) packet;
@ -168,7 +168,7 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
if (udp->checksum != orig_checksum) {
/* packet is corrupted and shouldn't be processed */
printf("[Debug] Wrong checksum\n");
log_debug("Wrong checksum");
return 1;
}
@ -178,15 +178,14 @@ int udp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload)
udp->port_src, udp->port_dest);
if (connection == NULL) {
printf("[Debug] Error! Outgoing connection wasn't "
"found/created in NAT!\n");
log_warn("Outgoing connection wasn't found/created in NAT!");
return 1;
}
/* allocate memory for translated packet */
packet_size = sizeof(struct s_ipv4) + htons(ip6->len);
if ((packet = (unsigned char *) malloc(packet_size)) == NULL) {
fprintf(stderr, "[Error] Lack of free memory\n");
log_error("Lack of free memory");
return 1;
}
ip4 = (struct s_ipv4 *) packet;

28
src/wrapper.c
View File

@ -22,7 +22,6 @@
#include <netpacket/packet.h> /* struct packet_mreq, struct sockaddr_ll */
#include <netinet/in.h> /* htons */
#include <net/ethernet.h> /* ETHERTYPE_* */
#include <stdio.h>
#include <stdlib.h> /* srand */
#include <string.h> /* strncpy */
#include <sys/ioctl.h> /* ioctl, SIOCGIFINDEX */
@ -33,6 +32,7 @@
#include "ethernet.h"
#include "ipv4.h"
#include "ipv6.h"
#include "log.h"
#include "nat.h"
#include "transmitter.h"
#include "wrapper.h"
@ -63,16 +63,18 @@ int main(int argc, char **argv)
int length;
char buffer[MTU];
log_info(PACKAGE_STRING " is starting");
/* initialize the socket for sniffing */
if ((sniff_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) == -1) {
fprintf(stderr, "[Error] Unable to create listening socket\n");
log_error("Unable to create listening socket");
return 1;
}
/* get the interface */
strncpy(interface.ifr_name, INTERFACE, IFNAMSIZ);
if (ioctl(sniff_sock, SIOCGIFINDEX, &interface) == -1) {
fprintf(stderr, "[Error] Unable to get the interface\n");
log_error("Unable to get the interface");
return 1;
}
@ -82,11 +84,11 @@ int main(int argc, char **argv)
/* reinitialize the interface */
if (ioctl(sniff_sock, SIOCGIFINDEX, &interface) == -1) {
fprintf(stderr, "[Error] Unable to reinitialize the interface\n");
log_error("Unable to reinitialize the interface");
return 1;
}
} else {
fprintf(stderr, "[Error] Unable to get the interface's HW address\n");
log_error("Unable to get the interface's HW address");
return 1;
}
@ -95,7 +97,7 @@ int main(int argc, char **argv)
pmr.mr_ifindex = interface.ifr_ifindex;
pmr.mr_type = PACKET_MR_PROMISC;
if (setsockopt(sniff_sock, SOL_PACKET, PACKET_ADD_MEMBERSHIP, (char *) &pmr, sizeof(pmr)) == -1) {
fprintf(stderr, "[Error] Unable to set the promiscuous mode on the interface\n");
log_error("Unable to set the promiscuous mode on the interface");
return 1;
}
@ -111,7 +113,7 @@ int main(int argc, char **argv)
/* initiate sending socket */
if (transmission_init()) {
fprintf(stderr, "[Error] Unable to initiate sending socket\n");
log_error("Unable to initiate sending socket");
return 1;
}
@ -125,7 +127,7 @@ int main(int argc, char **argv)
for (;;) {
addr_size = sizeof(addr);
if ((length = recv(sniff_sock, buffer, MTU, 0)) == -1) {
fprintf(stderr, "[Error] Unable to retrieve data from socket\n");
log_error("Unable to retrieve data from socket");
return 1;
}
@ -141,7 +143,7 @@ int main(int argc, char **argv)
/* unset the promiscuous mode */
if (setsockopt(sniff_sock, SOL_PACKET, PACKET_DROP_MEMBERSHIP, (char *) &pmr, sizeof(pmr)) == -1) {
fprintf(stderr, "[Error] Unable to unset the promiscuous mode on the interface\n");
log_error("Unable to unset the promiscuous mode on the interface");
/* do not call `return` here as we want to close the socket too */
}
@ -162,16 +164,16 @@ int process(char *packet)
switch (htons(eth->type)) {
case ETHERTYPE_IP:
printf("[Debug] HW Protocol: IPv4\n");
log_debug("HW Protocol: IPv4");
return ipv4(eth, payload);
case ETHERTYPE_IPV6:
printf("[Debug] HW Protocol: IPv6\n");
log_debug("HW Protocol: IPv6");
return ipv6(eth, payload);
case ETHERTYPE_ARP:
printf("[Debug] HW Protocol: ARP\n");
log_debug("HW Protocol: ARP");
return arp(eth, payload);
default:
printf("[Debug] HW Protocol: unknown [%d/0x%04x]\n",
log_debug("HW Protocol: unknown [%d/0x%04x]",
htons(eth->type), htons(eth->type));
return 1;
}