7357a87ddf
- Trailing spaces and empty lines are ignored. - A `#' sign will mark the remaining of the line as a comment. Reviewed by: Ari Suutari <ari@suutari.iki.fi>
1586 lines
30 KiB
C
1586 lines
30 KiB
C
/*
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* natd - Network Address Translation Daemon for FreeBSD.
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*
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* This software is provided free of charge, with no
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* warranty of any kind, either expressed or implied.
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* Use at your own risk.
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*
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* You may copy, modify and distribute this software (natd.c) freely.
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*
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* Ari Suutari <suutari@iki.fi>
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*
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* $FreeBSD$
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*/
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#define SYSLOG_NAMES
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <machine/in_cksum.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <arpa/inet.h>
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#include <alias.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <signal.h>
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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 <syslog.h>
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#include <unistd.h>
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#include "natd.h"
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/*
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* Default values for input and output
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* divert socket ports.
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*/
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#define DEFAULT_SERVICE "natd"
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/*
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* Definition of a port range, and macros to deal with values.
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* FORMAT: HI 16-bits == first port in range, 0 == all ports.
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* LO 16-bits == number of ports in range
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* NOTES: - Port values are not stored in network byte order.
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*/
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typedef u_long port_range;
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#define GETLOPORT(x) ((x) >> 0x10)
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#define GETNUMPORTS(x) ((x) & 0x0000ffff)
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#define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x)))
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/* Set y to be the low-port value in port_range variable x. */
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#define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10))
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/* Set y to be the number of ports in port_range variable x. */
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#define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y))
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/*
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* Function prototypes.
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*/
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static void DoAliasing (int fd, int direction);
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static void DaemonMode (void);
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static void HandleRoutingInfo (int fd);
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static void Usage (void);
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static char* FormatPacket (struct ip*);
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static void PrintPacket (struct ip*);
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static void SyslogPacket (struct ip*, int priority, const char *label);
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static void SetAliasAddressFromIfName (char* ifName);
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static void InitiateShutdown (int);
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static void Shutdown (int);
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static void RefreshAddr (int);
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static void ParseOption (const char* option, const char* parms, int cmdLine);
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static void ReadConfigFile (const char* fileName);
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static void SetupPortRedirect (const char* parms);
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static void SetupAddressRedirect (const char* parms);
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static void SetupPptpAlias (const char* parms);
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static void StrToAddr (const char* str, struct in_addr* addr);
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static u_short StrToPort (const char* str, const char* proto);
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static int StrToPortRange (const char* str, const char* proto, port_range *portRange);
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static int StrToProto (const char* str);
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static int StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, port_range *portRange);
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static void ParseArgs (int argc, char** argv);
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static void FlushPacketBuffer (int fd);
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/*
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* Globals.
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*/
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static int verbose;
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static int background;
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static int running;
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static int assignAliasAddr;
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static char* ifName;
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static int ifIndex;
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static u_short inPort;
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static u_short outPort;
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static u_short inOutPort;
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static struct in_addr aliasAddr;
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static int dynamicMode;
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static int ifMTU;
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static int aliasOverhead;
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static int icmpSock;
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static char packetBuf[IP_MAXPACKET];
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static int packetLen;
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static struct sockaddr_in packetAddr;
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static int packetSock;
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static int packetDirection;
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static int dropIgnoredIncoming;
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static int logDropped;
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static int logFacility;
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int main (int argc, char** argv)
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{
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int divertIn;
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int divertOut;
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int divertInOut;
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int routeSock;
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struct sockaddr_in addr;
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fd_set readMask;
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fd_set writeMask;
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int fdMax;
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/*
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* Initialize packet aliasing software.
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* Done already here to be able to alter option bits
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* during command line and configuration file processing.
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*/
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PacketAliasInit ();
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/*
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* Parse options.
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*/
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inPort = 0;
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outPort = 0;
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verbose = 0;
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inOutPort = 0;
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ifName = NULL;
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ifMTU = -1;
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background = 0;
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running = 1;
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assignAliasAddr = 0;
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aliasAddr.s_addr = INADDR_NONE;
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aliasOverhead = 12;
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dynamicMode = 0;
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logDropped = 0;
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logFacility = LOG_DAEMON;
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/*
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* Mark packet buffer empty.
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*/
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packetSock = -1;
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packetDirection = DONT_KNOW;
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ParseArgs (argc, argv);
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/*
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* Open syslog channel.
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*/
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openlog ("natd", LOG_CONS | LOG_PID, logFacility);
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/*
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* Check that valid aliasing address has been given.
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*/
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if (aliasAddr.s_addr == INADDR_NONE && ifName == NULL)
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errx (1, "aliasing address not given");
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if (aliasAddr.s_addr != INADDR_NONE && ifName != NULL)
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errx (1, "both alias address and interface "
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"name are not allowed");
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/*
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* Check that valid port number is known.
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*/
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if (inPort != 0 || outPort != 0)
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if (inPort == 0 || outPort == 0)
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errx (1, "both input and output ports are required");
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if (inPort == 0 && outPort == 0 && inOutPort == 0)
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ParseOption ("port", DEFAULT_SERVICE, 0);
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/*
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* Check if ignored packets should be dropped.
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*/
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dropIgnoredIncoming = PacketAliasSetMode (0, 0);
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dropIgnoredIncoming &= PKT_ALIAS_DENY_INCOMING;
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/*
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* Create divert sockets. Use only one socket if -p was specified
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* on command line. Otherwise, create separate sockets for
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* outgoing and incoming connnections.
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*/
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if (inOutPort) {
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divertInOut = socket (PF_INET, SOCK_RAW, IPPROTO_DIVERT);
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if (divertInOut == -1)
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Quit ("Unable to create divert socket.");
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divertIn = -1;
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divertOut = -1;
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/*
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* Bind socket.
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*/
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = INADDR_ANY;
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addr.sin_port = inOutPort;
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if (bind (divertInOut,
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(struct sockaddr*) &addr,
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sizeof addr) == -1)
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Quit ("Unable to bind divert socket.");
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}
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else {
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divertIn = socket (PF_INET, SOCK_RAW, IPPROTO_DIVERT);
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if (divertIn == -1)
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Quit ("Unable to create incoming divert socket.");
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divertOut = socket (PF_INET, SOCK_RAW, IPPROTO_DIVERT);
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if (divertOut == -1)
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Quit ("Unable to create outgoing divert socket.");
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divertInOut = -1;
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/*
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* Bind divert sockets.
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*/
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = INADDR_ANY;
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addr.sin_port = inPort;
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if (bind (divertIn,
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(struct sockaddr*) &addr,
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sizeof addr) == -1)
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Quit ("Unable to bind incoming divert socket.");
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = INADDR_ANY;
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addr.sin_port = outPort;
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if (bind (divertOut,
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(struct sockaddr*) &addr,
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sizeof addr) == -1)
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Quit ("Unable to bind outgoing divert socket.");
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}
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/*
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* Create routing socket if interface name specified.
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*/
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if (ifName && dynamicMode) {
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routeSock = socket (PF_ROUTE, SOCK_RAW, 0);
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if (routeSock == -1)
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Quit ("Unable to create routing info socket.");
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}
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else
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routeSock = -1;
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/*
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* Create socket for sending ICMP messages.
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*/
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icmpSock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
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if (icmpSock == -1)
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Quit ("Unable to create ICMP socket.");
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/*
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* And disable reads for the socket, otherwise it slowly fills
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* up with received icmps which we do not use.
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*/
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shutdown(icmpSock, SHUT_RD);
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/*
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* Become a daemon unless verbose mode was requested.
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*/
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if (!verbose)
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DaemonMode ();
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/*
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* Catch signals to manage shutdown and
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* refresh of interface address.
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*/
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siginterrupt(SIGTERM, 1);
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siginterrupt(SIGHUP, 1);
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signal (SIGTERM, InitiateShutdown);
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signal (SIGHUP, RefreshAddr);
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/*
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* Set alias address if it has been given.
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*/
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if (aliasAddr.s_addr != INADDR_NONE)
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PacketAliasSetAddress (aliasAddr);
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/*
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* We need largest descriptor number for select.
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*/
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fdMax = -1;
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if (divertIn > fdMax)
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fdMax = divertIn;
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if (divertOut > fdMax)
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fdMax = divertOut;
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if (divertInOut > fdMax)
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fdMax = divertInOut;
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if (routeSock > fdMax)
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fdMax = routeSock;
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while (running) {
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if (divertInOut != -1 && !ifName && packetSock == -1) {
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/*
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* When using only one socket, just call
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* DoAliasing repeatedly to process packets.
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*/
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DoAliasing (divertInOut, DONT_KNOW);
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continue;
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}
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/*
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* Build read mask from socket descriptors to select.
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*/
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FD_ZERO (&readMask);
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FD_ZERO (&writeMask);
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/*
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* If there is unsent packet in buffer, use select
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* to check when socket comes writable again.
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*/
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if (packetSock != -1) {
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FD_SET (packetSock, &writeMask);
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}
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else {
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/*
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* No unsent packet exists - safe to check if
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* new ones are available.
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*/
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if (divertIn != -1)
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FD_SET (divertIn, &readMask);
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if (divertOut != -1)
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FD_SET (divertOut, &readMask);
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if (divertInOut != -1)
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FD_SET (divertInOut, &readMask);
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}
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/*
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* Routing info is processed always.
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*/
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if (routeSock != -1)
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FD_SET (routeSock, &readMask);
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if (select (fdMax + 1,
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&readMask,
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&writeMask,
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NULL,
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NULL) == -1) {
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if (errno == EINTR)
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continue;
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Quit ("Select failed.");
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}
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if (packetSock != -1)
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if (FD_ISSET (packetSock, &writeMask))
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FlushPacketBuffer (packetSock);
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if (divertIn != -1)
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if (FD_ISSET (divertIn, &readMask))
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DoAliasing (divertIn, INPUT);
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if (divertOut != -1)
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if (FD_ISSET (divertOut, &readMask))
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DoAliasing (divertOut, OUTPUT);
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if (divertInOut != -1)
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if (FD_ISSET (divertInOut, &readMask))
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DoAliasing (divertInOut, DONT_KNOW);
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if (routeSock != -1)
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if (FD_ISSET (routeSock, &readMask))
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HandleRoutingInfo (routeSock);
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}
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if (background)
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unlink (PIDFILE);
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return 0;
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}
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static void DaemonMode ()
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{
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FILE* pidFile;
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daemon (0, 0);
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background = 1;
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pidFile = fopen (PIDFILE, "w");
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if (pidFile) {
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fprintf (pidFile, "%d\n", getpid ());
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fclose (pidFile);
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}
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}
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static void ParseArgs (int argc, char** argv)
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{
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int arg;
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char* parm;
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char* opt;
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char parmBuf[256];
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for (arg = 1; arg < argc; arg++) {
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opt = argv[arg];
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if (*opt != '-') {
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warnx ("invalid option %s", opt);
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Usage ();
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}
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parm = NULL;
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parmBuf[0] = '\0';
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while (arg < argc - 1) {
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if (argv[arg + 1][0] == '-')
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break;
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if (parm)
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strcat (parmBuf, " ");
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++arg;
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parm = parmBuf;
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strcat (parmBuf, argv[arg]);
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}
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ParseOption (opt + 1, parm, 1);
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}
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}
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static void DoAliasing (int fd, int direction)
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{
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int bytes;
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int origBytes;
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int status;
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int addrSize;
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struct ip* ip;
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if (assignAliasAddr) {
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SetAliasAddressFromIfName (ifName);
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assignAliasAddr = 0;
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}
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/*
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* Get packet from socket.
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*/
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addrSize = sizeof packetAddr;
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origBytes = recvfrom (fd,
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packetBuf,
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sizeof packetBuf,
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0,
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(struct sockaddr*) &packetAddr,
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&addrSize);
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if (origBytes == -1) {
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if (errno != EINTR)
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Warn ("read from divert socket failed");
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return;
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}
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/*
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* This is a IP packet.
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*/
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ip = (struct ip*) packetBuf;
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if (direction == DONT_KNOW) {
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if (packetAddr.sin_addr.s_addr == INADDR_ANY)
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direction = OUTPUT;
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else
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direction = INPUT;
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}
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|
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if (verbose) {
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/*
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* Print packet direction and protocol type.
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*/
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printf (direction == OUTPUT ? "Out " : "In ");
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|
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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printf ("[TCP] ");
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break;
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case IPPROTO_UDP:
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printf ("[UDP] ");
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break;
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case IPPROTO_ICMP:
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printf ("[ICMP] ");
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break;
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default:
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printf ("[%d] ", ip->ip_p);
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break;
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}
|
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/*
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* Print addresses.
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*/
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PrintPacket (ip);
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}
|
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|
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if (direction == OUTPUT) {
|
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/*
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* Outgoing packets. Do aliasing.
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*/
|
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PacketAliasOut (packetBuf, IP_MAXPACKET);
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}
|
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else {
|
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|
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/*
|
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* Do aliasing.
|
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*/
|
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status = PacketAliasIn (packetBuf, IP_MAXPACKET);
|
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if (status == PKT_ALIAS_IGNORED &&
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dropIgnoredIncoming) {
|
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|
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if (verbose)
|
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printf (" dropped.\n");
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|
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if (logDropped)
|
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SyslogPacket (ip, LOG_WARNING, "denied");
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|
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return;
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}
|
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}
|
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/*
|
|
* Length might have changed during aliasing.
|
|
*/
|
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bytes = ntohs (ip->ip_len);
|
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/*
|
|
* Update alias overhead size for outgoing packets.
|
|
*/
|
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if (direction == OUTPUT &&
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bytes - origBytes > aliasOverhead)
|
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aliasOverhead = bytes - origBytes;
|
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|
|
if (verbose) {
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|
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/*
|
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* Print addresses after aliasing.
|
|
*/
|
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printf (" aliased to\n");
|
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printf (" ");
|
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PrintPacket (ip);
|
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printf ("\n");
|
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}
|
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|
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packetLen = bytes;
|
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packetSock = fd;
|
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packetDirection = direction;
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|
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FlushPacketBuffer (fd);
|
|
}
|
|
|
|
static void FlushPacketBuffer (int fd)
|
|
{
|
|
int wrote;
|
|
char msgBuf[80];
|
|
/*
|
|
* Put packet back for processing.
|
|
*/
|
|
wrote = sendto (fd,
|
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packetBuf,
|
|
packetLen,
|
|
0,
|
|
(struct sockaddr*) &packetAddr,
|
|
sizeof packetAddr);
|
|
|
|
if (wrote != packetLen) {
|
|
/*
|
|
* If buffer space is not available,
|
|
* just return. Main loop will take care of
|
|
* retrying send when space becomes available.
|
|
*/
|
|
if (errno == ENOBUFS)
|
|
return;
|
|
|
|
if (errno == EMSGSIZE) {
|
|
|
|
if (packetDirection == OUTPUT &&
|
|
ifMTU != -1)
|
|
SendNeedFragIcmp (icmpSock,
|
|
(struct ip*) packetBuf,
|
|
ifMTU - aliasOverhead);
|
|
}
|
|
else {
|
|
|
|
sprintf (msgBuf, "failed to write packet back");
|
|
Warn (msgBuf);
|
|
}
|
|
}
|
|
|
|
packetSock = -1;
|
|
}
|
|
|
|
static void HandleRoutingInfo (int fd)
|
|
{
|
|
int bytes;
|
|
struct if_msghdr ifMsg;
|
|
/*
|
|
* Get packet from socket.
|
|
*/
|
|
bytes = read (fd, &ifMsg, sizeof ifMsg);
|
|
if (bytes == -1) {
|
|
|
|
Warn ("read from routing socket failed");
|
|
return;
|
|
}
|
|
|
|
if (ifMsg.ifm_version != RTM_VERSION) {
|
|
|
|
Warn ("unexpected packet read from routing socket");
|
|
return;
|
|
}
|
|
|
|
if (verbose)
|
|
printf ("Routing message %X received.\n", ifMsg.ifm_type);
|
|
|
|
if (ifMsg.ifm_type != RTM_NEWADDR)
|
|
return;
|
|
|
|
if (verbose && ifMsg.ifm_index == ifIndex)
|
|
printf ("Interface address has changed.\n");
|
|
|
|
if (ifMsg.ifm_index == ifIndex)
|
|
assignAliasAddr = 1;
|
|
}
|
|
|
|
static void PrintPacket (struct ip* ip)
|
|
{
|
|
printf ("%s", FormatPacket (ip));
|
|
}
|
|
|
|
static void SyslogPacket (struct ip* ip, int priority, const char *label)
|
|
{
|
|
syslog (priority, "%s %s", label, FormatPacket (ip));
|
|
}
|
|
|
|
static char* FormatPacket (struct ip* ip)
|
|
{
|
|
static char buf[256];
|
|
struct tcphdr* tcphdr;
|
|
struct udphdr* udphdr;
|
|
struct icmp* icmphdr;
|
|
char src[20];
|
|
char dst[20];
|
|
|
|
strcpy (src, inet_ntoa (ip->ip_src));
|
|
strcpy (dst, inet_ntoa (ip->ip_dst));
|
|
|
|
switch (ip->ip_p) {
|
|
case IPPROTO_TCP:
|
|
tcphdr = (struct tcphdr*) ((char*) ip + (ip->ip_hl << 2));
|
|
sprintf (buf, "[TCP] %s:%d -> %s:%d",
|
|
src,
|
|
ntohs (tcphdr->th_sport),
|
|
dst,
|
|
ntohs (tcphdr->th_dport));
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
udphdr = (struct udphdr*) ((char*) ip + (ip->ip_hl << 2));
|
|
sprintf (buf, "[UDP] %s:%d -> %s:%d",
|
|
src,
|
|
ntohs (udphdr->uh_sport),
|
|
dst,
|
|
ntohs (udphdr->uh_dport));
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
icmphdr = (struct icmp*) ((char*) ip + (ip->ip_hl << 2));
|
|
sprintf (buf, "[ICMP] %s -> %s %u(%u)",
|
|
src,
|
|
dst,
|
|
icmphdr->icmp_type,
|
|
icmphdr->icmp_code);
|
|
break;
|
|
|
|
default:
|
|
sprintf (buf, "[%d] %s -> %s ", ip->ip_p, src, dst);
|
|
break;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static void SetAliasAddressFromIfName (char* ifn)
|
|
{
|
|
struct ifconf cf;
|
|
struct ifreq buf[32];
|
|
char msg[80];
|
|
struct ifreq* ifPtr;
|
|
int extra;
|
|
int helperSock;
|
|
int bytes;
|
|
struct sockaddr_in* addr;
|
|
int found;
|
|
struct ifreq req;
|
|
char last[10];
|
|
/*
|
|
* Create a dummy socket to access interface information.
|
|
*/
|
|
helperSock = socket (AF_INET, SOCK_DGRAM, 0);
|
|
if (helperSock == -1) {
|
|
|
|
Quit ("Failed to create helper socket.");
|
|
exit (1);
|
|
}
|
|
|
|
cf.ifc_len = sizeof (buf);
|
|
cf.ifc_req = buf;
|
|
/*
|
|
* Get interface data.
|
|
*/
|
|
if (ioctl (helperSock, SIOCGIFCONF, &cf) == -1) {
|
|
|
|
Quit ("Ioctl SIOCGIFCONF failed.");
|
|
exit (1);
|
|
}
|
|
|
|
ifIndex = 0;
|
|
ifPtr = buf;
|
|
bytes = cf.ifc_len;
|
|
found = 0;
|
|
last[0] = '\0';
|
|
/*
|
|
* Loop through interfaces until one with
|
|
* given name is found. This is done to
|
|
* find correct interface index for routing
|
|
* message processing.
|
|
*/
|
|
while (bytes) {
|
|
|
|
if (ifPtr->ifr_addr.sa_family == AF_INET &&
|
|
!strcmp (ifPtr->ifr_name, ifn)) {
|
|
|
|
found = 1;
|
|
break;
|
|
}
|
|
|
|
if (strcmp (last, ifPtr->ifr_name)) {
|
|
|
|
strcpy (last, ifPtr->ifr_name);
|
|
++ifIndex;
|
|
}
|
|
|
|
extra = ifPtr->ifr_addr.sa_len - sizeof (struct sockaddr);
|
|
if (extra < 0)
|
|
extra = 0;
|
|
|
|
ifPtr++;
|
|
ifPtr = (struct ifreq*) ((char*) ifPtr + extra);
|
|
bytes -= sizeof (struct ifreq) + extra;
|
|
}
|
|
|
|
if (!found) {
|
|
|
|
close (helperSock);
|
|
sprintf (msg, "Unknown interface name %s.\n", ifn);
|
|
Quit (msg);
|
|
}
|
|
/*
|
|
* Get MTU size.
|
|
*/
|
|
strcpy (req.ifr_name, ifn);
|
|
|
|
if (ioctl (helperSock, SIOCGIFMTU, &req) == -1)
|
|
Quit ("Cannot get interface mtu size.");
|
|
|
|
ifMTU = req.ifr_mtu;
|
|
/*
|
|
* Get interface address.
|
|
*/
|
|
if (ioctl (helperSock, SIOCGIFADDR, &req) == -1)
|
|
Quit ("Cannot get interface address.");
|
|
|
|
addr = (struct sockaddr_in*) &req.ifr_addr;
|
|
PacketAliasSetAddress (addr->sin_addr);
|
|
syslog (LOG_INFO, "Aliasing to %s, mtu %d bytes",
|
|
inet_ntoa (addr->sin_addr),
|
|
ifMTU);
|
|
|
|
close (helperSock);
|
|
}
|
|
|
|
void Quit (const char* msg)
|
|
{
|
|
Warn (msg);
|
|
exit (1);
|
|
}
|
|
|
|
void Warn (const char* msg)
|
|
{
|
|
if (background)
|
|
syslog (LOG_ALERT, "%s (%m)", msg);
|
|
else
|
|
warn (msg);
|
|
}
|
|
|
|
static void RefreshAddr (int sig)
|
|
{
|
|
if (ifName)
|
|
assignAliasAddr = 1;
|
|
}
|
|
|
|
static void InitiateShutdown (int sig)
|
|
{
|
|
/*
|
|
* Start timer to allow kernel gracefully
|
|
* shutdown existing connections when system
|
|
* is shut down.
|
|
*/
|
|
siginterrupt(SIGALRM, 1);
|
|
signal (SIGALRM, Shutdown);
|
|
alarm (10);
|
|
}
|
|
|
|
static void Shutdown (int sig)
|
|
{
|
|
running = 0;
|
|
}
|
|
|
|
/*
|
|
* Different options recognized by this program.
|
|
*/
|
|
|
|
enum Option {
|
|
|
|
PacketAliasOption,
|
|
Verbose,
|
|
InPort,
|
|
OutPort,
|
|
Port,
|
|
AliasAddress,
|
|
InterfaceName,
|
|
RedirectPort,
|
|
RedirectAddress,
|
|
ConfigFile,
|
|
DynamicMode,
|
|
PptpAlias,
|
|
ProxyRule,
|
|
LogDenied,
|
|
LogFacility
|
|
};
|
|
|
|
enum Param {
|
|
|
|
YesNo,
|
|
Numeric,
|
|
String,
|
|
None,
|
|
Address,
|
|
Service
|
|
};
|
|
|
|
/*
|
|
* Option information structure (used by ParseOption).
|
|
*/
|
|
|
|
struct OptionInfo {
|
|
|
|
enum Option type;
|
|
int packetAliasOpt;
|
|
enum Param parm;
|
|
const char* parmDescription;
|
|
const char* description;
|
|
const char* name;
|
|
const char* shortName;
|
|
};
|
|
|
|
/*
|
|
* Table of known options.
|
|
*/
|
|
|
|
static struct OptionInfo optionTable[] = {
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_UNREGISTERED_ONLY,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"alias only unregistered addresses",
|
|
"unregistered_only",
|
|
"u" },
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_LOG,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"enable logging",
|
|
"log",
|
|
"l" },
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_PROXY_ONLY,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"proxy only",
|
|
"proxy_only",
|
|
NULL },
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_REVERSE,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"operate in reverse mode",
|
|
"reverse",
|
|
NULL },
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_DENY_INCOMING,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"allow incoming connections",
|
|
"deny_incoming",
|
|
"d" },
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_USE_SOCKETS,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"use sockets to inhibit port conflict",
|
|
"use_sockets",
|
|
"s" },
|
|
|
|
{ PacketAliasOption,
|
|
PKT_ALIAS_SAME_PORTS,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"try to keep original port numbers for connections",
|
|
"same_ports",
|
|
"m" },
|
|
|
|
{ Verbose,
|
|
0,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"verbose mode, dump packet information",
|
|
"verbose",
|
|
"v" },
|
|
|
|
{ DynamicMode,
|
|
0,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"dynamic mode, automatically detect interface address changes",
|
|
"dynamic",
|
|
NULL },
|
|
|
|
{ InPort,
|
|
0,
|
|
Service,
|
|
"number|service_name",
|
|
"set port for incoming packets",
|
|
"in_port",
|
|
"i" },
|
|
|
|
{ OutPort,
|
|
0,
|
|
Service,
|
|
"number|service_name",
|
|
"set port for outgoing packets",
|
|
"out_port",
|
|
"o" },
|
|
|
|
{ Port,
|
|
0,
|
|
Service,
|
|
"number|service_name",
|
|
"set port (defaults to natd/divert)",
|
|
"port",
|
|
"p" },
|
|
|
|
{ AliasAddress,
|
|
0,
|
|
Address,
|
|
"x.x.x.x",
|
|
"address to use for aliasing",
|
|
"alias_address",
|
|
"a" },
|
|
|
|
{ InterfaceName,
|
|
0,
|
|
String,
|
|
"network_if_name",
|
|
"take aliasing address from interface",
|
|
"interface",
|
|
"n" },
|
|
|
|
{ ProxyRule,
|
|
0,
|
|
String,
|
|
"[type encode_ip_hdr|encode_tcp_stream] port xxxx server "
|
|
"a.b.c.d:yyyy",
|
|
"add transparent proxying / destination NAT",
|
|
"proxy_rule",
|
|
NULL },
|
|
|
|
{ RedirectPort,
|
|
0,
|
|
String,
|
|
"tcp|udp local_addr:local_port_range [public_addr:]public_port_range"
|
|
" [remote_addr[:remote_port_range]]",
|
|
"redirect a port (or ports) for incoming traffic",
|
|
"redirect_port",
|
|
NULL },
|
|
|
|
{ RedirectAddress,
|
|
0,
|
|
String,
|
|
"local_addr public_addr",
|
|
"define mapping between local and public addresses",
|
|
"redirect_address",
|
|
NULL },
|
|
|
|
{ PptpAlias,
|
|
0,
|
|
String,
|
|
"src",
|
|
"define inside machine for PPTP traffic",
|
|
"pptpalias",
|
|
NULL },
|
|
|
|
{ ConfigFile,
|
|
0,
|
|
String,
|
|
"file_name",
|
|
"read options from configuration file",
|
|
"config",
|
|
"f" },
|
|
|
|
{ LogDenied,
|
|
0,
|
|
YesNo,
|
|
"[yes|no]",
|
|
"enable logging of denied incoming packets",
|
|
"log_denied",
|
|
NULL },
|
|
|
|
{ LogFacility,
|
|
0,
|
|
String,
|
|
"facility",
|
|
"name of syslog facility to use for logging",
|
|
"log_facility",
|
|
NULL }
|
|
|
|
};
|
|
|
|
static void ParseOption (const char* option, const char* parms, int cmdLine)
|
|
{
|
|
int i;
|
|
struct OptionInfo* info;
|
|
int yesNoValue;
|
|
int aliasValue;
|
|
int numValue;
|
|
u_short uNumValue;
|
|
const char* strValue;
|
|
struct in_addr addrValue;
|
|
int max;
|
|
char* end;
|
|
CODE* fac_record = NULL;
|
|
/*
|
|
* Find option from table.
|
|
*/
|
|
max = sizeof (optionTable) / sizeof (struct OptionInfo);
|
|
for (i = 0, info = optionTable; i < max; i++, info++) {
|
|
|
|
if (!strcmp (info->name, option))
|
|
break;
|
|
|
|
if (info->shortName)
|
|
if (!strcmp (info->shortName, option))
|
|
break;
|
|
}
|
|
|
|
if (i >= max) {
|
|
|
|
warnx ("unknown option %s", option);
|
|
Usage ();
|
|
}
|
|
|
|
uNumValue = 0;
|
|
yesNoValue = 0;
|
|
numValue = 0;
|
|
strValue = NULL;
|
|
/*
|
|
* Check parameters.
|
|
*/
|
|
switch (info->parm) {
|
|
case YesNo:
|
|
if (!parms)
|
|
parms = "yes";
|
|
|
|
if (!strcmp (parms, "yes"))
|
|
yesNoValue = 1;
|
|
else
|
|
if (!strcmp (parms, "no"))
|
|
yesNoValue = 0;
|
|
else
|
|
errx (1, "%s needs yes/no parameter", option);
|
|
break;
|
|
|
|
case Service:
|
|
if (!parms)
|
|
errx (1, "%s needs service name or "
|
|
"port number parameter",
|
|
option);
|
|
|
|
uNumValue = StrToPort (parms, "divert");
|
|
break;
|
|
|
|
case Numeric:
|
|
if (parms)
|
|
numValue = strtol (parms, &end, 10);
|
|
else
|
|
end = NULL;
|
|
|
|
if (end == parms)
|
|
errx (1, "%s needs numeric parameter", option);
|
|
break;
|
|
|
|
case String:
|
|
strValue = parms;
|
|
if (!strValue)
|
|
errx (1, "%s needs parameter", option);
|
|
break;
|
|
|
|
case None:
|
|
if (parms)
|
|
errx (1, "%s does not take parameters", option);
|
|
break;
|
|
|
|
case Address:
|
|
if (!parms)
|
|
errx (1, "%s needs address/host parameter", option);
|
|
|
|
StrToAddr (parms, &addrValue);
|
|
break;
|
|
}
|
|
|
|
switch (info->type) {
|
|
case PacketAliasOption:
|
|
|
|
aliasValue = yesNoValue ? info->packetAliasOpt : 0;
|
|
PacketAliasSetMode (aliasValue, info->packetAliasOpt);
|
|
break;
|
|
|
|
case Verbose:
|
|
verbose = yesNoValue;
|
|
break;
|
|
|
|
case DynamicMode:
|
|
dynamicMode = yesNoValue;
|
|
break;
|
|
|
|
case InPort:
|
|
inPort = uNumValue;
|
|
break;
|
|
|
|
case OutPort:
|
|
outPort = uNumValue;
|
|
break;
|
|
|
|
case Port:
|
|
inOutPort = uNumValue;
|
|
break;
|
|
|
|
case AliasAddress:
|
|
memcpy (&aliasAddr, &addrValue, sizeof (struct in_addr));
|
|
break;
|
|
|
|
case RedirectPort:
|
|
SetupPortRedirect (strValue);
|
|
break;
|
|
|
|
case RedirectAddress:
|
|
SetupAddressRedirect (strValue);
|
|
break;
|
|
|
|
case PptpAlias:
|
|
SetupPptpAlias (strValue);
|
|
break;
|
|
|
|
case ProxyRule:
|
|
PacketAliasProxyRule (strValue);
|
|
break;
|
|
|
|
case InterfaceName:
|
|
if (ifName)
|
|
free (ifName);
|
|
|
|
ifName = strdup (strValue);
|
|
assignAliasAddr = 1;
|
|
break;
|
|
|
|
case ConfigFile:
|
|
ReadConfigFile (strValue);
|
|
break;
|
|
|
|
case LogDenied:
|
|
logDropped = 1;
|
|
break;
|
|
|
|
case LogFacility:
|
|
|
|
fac_record = facilitynames;
|
|
while (fac_record->c_name != NULL) {
|
|
|
|
if (!strcmp (fac_record->c_name, strValue)) {
|
|
|
|
logFacility = fac_record->c_val;
|
|
break;
|
|
|
|
}
|
|
else
|
|
fac_record++;
|
|
}
|
|
|
|
if(fac_record->c_name == NULL)
|
|
errx(1, "Unknown log facility name: %s", strValue);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ReadConfigFile (const char* fileName)
|
|
{
|
|
FILE* file;
|
|
char buf[128];
|
|
char *ptr, *p;
|
|
char* option;
|
|
|
|
file = fopen (fileName, "r");
|
|
if (!file) {
|
|
|
|
sprintf (buf, "Cannot open config file %s.\n", fileName);
|
|
Quit (buf);
|
|
}
|
|
|
|
while (fgets (buf, sizeof (buf), file)) {
|
|
|
|
ptr = strchr (buf, '\n');
|
|
if (!ptr)
|
|
errx (1, "config line too long: %s", buf);
|
|
|
|
*ptr = '\0';
|
|
|
|
/*
|
|
* Check for comments, strip off trailing spaces.
|
|
*/
|
|
if ((ptr = strchr(buf, '#')))
|
|
*ptr = '\0';
|
|
for (ptr = buf; isspace(*ptr); ++ptr)
|
|
continue;
|
|
if (*ptr == '\0')
|
|
continue;
|
|
for (p = strchr(buf, '\0'); isspace(*--p);)
|
|
continue;
|
|
*++p = '\0';
|
|
|
|
/*
|
|
* Extract option name.
|
|
*/
|
|
option = ptr;
|
|
while (*ptr && !isspace (*ptr))
|
|
++ptr;
|
|
|
|
if (*ptr != '\0') {
|
|
|
|
*ptr = '\0';
|
|
++ptr;
|
|
}
|
|
/*
|
|
* Skip white space between name and parms.
|
|
*/
|
|
while (*ptr && isspace (*ptr))
|
|
++ptr;
|
|
|
|
ParseOption (option, *ptr ? ptr : NULL, 0);
|
|
}
|
|
|
|
fclose (file);
|
|
}
|
|
|
|
static void Usage ()
|
|
{
|
|
int i;
|
|
int max;
|
|
struct OptionInfo* info;
|
|
|
|
fprintf (stderr, "Recognized options:\n\n");
|
|
|
|
max = sizeof (optionTable) / sizeof (struct OptionInfo);
|
|
for (i = 0, info = optionTable; i < max; i++, info++) {
|
|
|
|
fprintf (stderr, "-%-20s %s\n", info->name,
|
|
info->parmDescription);
|
|
|
|
if (info->shortName)
|
|
fprintf (stderr, "-%-20s %s\n", info->shortName,
|
|
info->parmDescription);
|
|
|
|
fprintf (stderr, " %s\n\n", info->description);
|
|
}
|
|
|
|
exit (1);
|
|
}
|
|
|
|
void SetupPptpAlias (const char* parms)
|
|
{
|
|
char buf[128];
|
|
char* ptr;
|
|
struct in_addr srcAddr;
|
|
|
|
strcpy (buf, parms);
|
|
|
|
/*
|
|
* Extract source address.
|
|
*/
|
|
ptr = strtok (buf, " \t");
|
|
if (!ptr)
|
|
errx(1, "pptpalias: missing src address");
|
|
|
|
StrToAddr (ptr, &srcAddr);
|
|
PacketAliasPptp (srcAddr);
|
|
}
|
|
|
|
void SetupPortRedirect (const char* parms)
|
|
{
|
|
char buf[128];
|
|
char* ptr;
|
|
struct in_addr localAddr;
|
|
struct in_addr publicAddr;
|
|
struct in_addr remoteAddr;
|
|
port_range portRange;
|
|
u_short localPort = 0;
|
|
u_short publicPort = 0;
|
|
u_short remotePort = 0;
|
|
u_short numLocalPorts = 0;
|
|
u_short numPublicPorts = 0;
|
|
u_short numRemotePorts = 0;
|
|
int proto;
|
|
char* protoName;
|
|
char* separator;
|
|
int i;
|
|
|
|
strcpy (buf, parms);
|
|
/*
|
|
* Extract protocol.
|
|
*/
|
|
protoName = strtok (buf, " \t");
|
|
if (!protoName)
|
|
errx (1, "redirect_port: missing protocol");
|
|
|
|
proto = StrToProto (protoName);
|
|
/*
|
|
* Extract local address.
|
|
*/
|
|
ptr = strtok (NULL, " \t");
|
|
if (!ptr)
|
|
errx (1, "redirect_port: missing local address");
|
|
|
|
if ( StrToAddrAndPortRange (ptr, &localAddr, protoName, &portRange) != 0 )
|
|
errx (1, "redirect_port: invalid local port range");
|
|
|
|
localPort = GETLOPORT(portRange);
|
|
numLocalPorts = GETNUMPORTS(portRange);
|
|
|
|
/*
|
|
* Extract public port and optionally address.
|
|
*/
|
|
ptr = strtok (NULL, " \t");
|
|
if (!ptr)
|
|
errx (1, "redirect_port: missing public port");
|
|
|
|
separator = strchr (ptr, ':');
|
|
if (separator) {
|
|
if (StrToAddrAndPortRange (ptr, &publicAddr, protoName, &portRange) != 0 )
|
|
errx (1, "redirect_port: invalid public port range");
|
|
}
|
|
else {
|
|
publicAddr.s_addr = INADDR_ANY;
|
|
if (StrToPortRange (ptr, protoName, &portRange) != 0)
|
|
errx (1, "redirect_port: invalid public port range");
|
|
}
|
|
|
|
publicPort = GETLOPORT(portRange);
|
|
numPublicPorts = GETNUMPORTS(portRange);
|
|
|
|
/*
|
|
* Extract remote address and optionally port.
|
|
*/
|
|
ptr = strtok (NULL, " \t");
|
|
if (ptr) {
|
|
separator = strchr (ptr, ':');
|
|
if (separator) {
|
|
if (StrToAddrAndPortRange (ptr, &remoteAddr, protoName, &portRange) != 0)
|
|
errx (1, "redirect_port: invalid remote port range");
|
|
} else {
|
|
SETLOPORT(portRange, 0);
|
|
SETNUMPORTS(portRange, 1);
|
|
StrToAddr (ptr, &remoteAddr);
|
|
}
|
|
}
|
|
else {
|
|
SETLOPORT(portRange, 0);
|
|
SETNUMPORTS(portRange, 1);
|
|
remoteAddr.s_addr = INADDR_ANY;
|
|
}
|
|
|
|
remotePort = GETLOPORT(portRange);
|
|
numRemotePorts = GETNUMPORTS(portRange);
|
|
|
|
/*
|
|
* Make sure port ranges match up, then add the redirect ports.
|
|
*/
|
|
if (numLocalPorts != numPublicPorts)
|
|
errx (1, "redirect_port: port ranges must be equal in size");
|
|
|
|
/* Remote port range is allowed to be '0' which means all ports. */
|
|
if (numRemotePorts != numLocalPorts && (numRemotePorts != 1 || remotePort != 0))
|
|
errx (1, "redirect_port: remote port must be 0 or equal to local port range in size");
|
|
|
|
for (i = 0 ; i < numPublicPorts ; ++i) {
|
|
/* If remotePort is all ports, set it to 0. */
|
|
u_short remotePortCopy = remotePort + i;
|
|
if (numRemotePorts == 1 && remotePort == 0)
|
|
remotePortCopy = 0;
|
|
|
|
PacketAliasRedirectPort (localAddr,
|
|
htons(localPort + i),
|
|
remoteAddr,
|
|
htons(remotePortCopy),
|
|
publicAddr,
|
|
htons(publicPort + i),
|
|
proto);
|
|
}
|
|
}
|
|
|
|
void SetupAddressRedirect (const char* parms)
|
|
{
|
|
char buf[128];
|
|
char* ptr;
|
|
struct in_addr localAddr;
|
|
struct in_addr publicAddr;
|
|
|
|
strcpy (buf, parms);
|
|
/*
|
|
* Extract local address.
|
|
*/
|
|
ptr = strtok (buf, " \t");
|
|
if (!ptr)
|
|
errx (1, "redirect_address: missing local address");
|
|
|
|
StrToAddr (ptr, &localAddr);
|
|
/*
|
|
* Extract public address.
|
|
*/
|
|
ptr = strtok (NULL, " \t");
|
|
if (!ptr)
|
|
errx (1, "redirect_address: missing public address");
|
|
|
|
StrToAddr (ptr, &publicAddr);
|
|
PacketAliasRedirectAddr (localAddr, publicAddr);
|
|
}
|
|
|
|
void StrToAddr (const char* str, struct in_addr* addr)
|
|
{
|
|
struct hostent* hp;
|
|
|
|
if (inet_aton (str, addr))
|
|
return;
|
|
|
|
hp = gethostbyname (str);
|
|
if (!hp)
|
|
errx (1, "unknown host %s", str);
|
|
|
|
memcpy (addr, hp->h_addr, sizeof (struct in_addr));
|
|
}
|
|
|
|
u_short StrToPort (const char* str, const char* proto)
|
|
{
|
|
u_short port;
|
|
struct servent* sp;
|
|
char* end;
|
|
|
|
port = strtol (str, &end, 10);
|
|
if (end != str)
|
|
return htons (port);
|
|
|
|
sp = getservbyname (str, proto);
|
|
if (!sp)
|
|
errx (1, "unknown service %s/%s", str, proto);
|
|
|
|
return sp->s_port;
|
|
}
|
|
|
|
int StrToPortRange (const char* str, const char* proto, port_range *portRange)
|
|
{
|
|
char* sep;
|
|
struct servent* sp;
|
|
char* end;
|
|
u_short loPort;
|
|
u_short hiPort;
|
|
|
|
/* First see if this is a service, return corresponding port if so. */
|
|
sp = getservbyname (str,proto);
|
|
if (sp) {
|
|
SETLOPORT(*portRange, ntohs(sp->s_port));
|
|
SETNUMPORTS(*portRange, 1);
|
|
return 0;
|
|
}
|
|
|
|
/* Not a service, see if it's a single port or port range. */
|
|
sep = strchr (str, '-');
|
|
if (sep == NULL) {
|
|
SETLOPORT(*portRange, strtol(str, &end, 10));
|
|
if (end != str) {
|
|
/* Single port. */
|
|
SETNUMPORTS(*portRange, 1);
|
|
return 0;
|
|
}
|
|
|
|
/* Error in port range field. */
|
|
errx (1, "unknown service %s/%s", str, proto);
|
|
}
|
|
|
|
/* Port range, get the values and sanity check. */
|
|
sscanf (str, "%hu-%hu", &loPort, &hiPort);
|
|
SETLOPORT(*portRange, loPort);
|
|
SETNUMPORTS(*portRange, 0); /* Error by default */
|
|
if (loPort <= hiPort)
|
|
SETNUMPORTS(*portRange, hiPort - loPort + 1);
|
|
|
|
if (GETNUMPORTS(*portRange) == 0)
|
|
errx (1, "invalid port range %s", str);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int StrToProto (const char* str)
|
|
{
|
|
if (!strcmp (str, "tcp"))
|
|
return IPPROTO_TCP;
|
|
|
|
if (!strcmp (str, "udp"))
|
|
return IPPROTO_UDP;
|
|
|
|
errx (1, "unknown protocol %s. Expected tcp or udp", str);
|
|
}
|
|
|
|
int StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, port_range *portRange)
|
|
{
|
|
char* ptr;
|
|
|
|
ptr = strchr (str, ':');
|
|
if (!ptr)
|
|
errx (1, "%s is missing port number", str);
|
|
|
|
*ptr = '\0';
|
|
++ptr;
|
|
|
|
StrToAddr (str, addr);
|
|
return StrToPortRange (ptr, proto, portRange);
|
|
}
|