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zebedee.c
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zebedee.c
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/*
** This file is part of "zebedee".
**
** Copyright 1999-2005 by Neil Winton. All rights reserved.
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** For further details on "zebedee" see http://www.winton.org.uk/zebedee/
**
*/
char *zebedee_c_rcsid = "$Id: zebedee.c,v 1.49 2005/09/02 22:20:23 ndwinton Exp $";
#define RELEASE_STR "2.5.5"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#ifdef USE_GMP_LIBRARY
#include "gmp.h"
#else
#include "huge.h"
/*
** Zebedee originally used the GMP library (and this can still be enabled
** by defining USE_GMP_LIBRARY) but for reasons of portability it now uses
** the "Huge" number routines bundled with the Zebedee distribution. GMP
** is a very high-quality library but is hard to port to non-UN*X/gcc
** environments.
**
** The function calls used in the code are, however, still GMP-compatible
** through the use of the following macro definitions.
*/
typedef Huge *mpz_t;
#define mpz_init(z)
#define mpz_init_set_str(z, s, n) (z = huge_from_string(s, NULL, n))
#define mpz_powm(k, g, e, m) (k = huge_powmod(g, e, m))
#define mpz_get_str(p, n, z) huge_format(z, n)
#define mpz_clear(z) huge_free(z)
#endif
#include "blowfish.h"
#include "zlib.h"
#ifndef DONT_HAVE_BZIP2
#include "bzlib.h"
#endif
#include "sha.h"
#ifdef __CYGWIN__
#undef WIN32
#endif
/*
** Named mutex values (see mutexLock/Unlock)
*/
#define MUTEX_IO 0 /* Mutex to protect stdio and other library calls */
#define MUTEX_KEYLIST 1 /* Mutex to protect key list access */
#define MUTEX_TOKEN 2 /* Mutex to protect token allocation/access */
#define MUTEX_HNDLIST 3 /* Mutex to protect UDP handler list access */
#define MUTEX_ACTIVE 4 /* Mutex to protect count of active handlers */
#define MUTEX_MAX 5 /* How many mutexes will we use? */
/*
** Named condition variables
*/
#define COND_ACTIVE 0 /* Condition for change in active handler count */
#define COND_MAX 1 /* How many condition variables? */
/* BUG COMPATIBILITY -- REMOVE FOR PRODUCTION RELEASE */
#define BUGHTONL(x) (BugCompatibility == 251 ? (x) : htonl(x))
#define BUGNTOHL(x) (BugCompatibility == 251 ? (x) : ntohl(x))
#ifdef WIN32
/*
** Windows-specific include files and macros
*/
#ifndef FD_SETSIZE
/*
** This allows us to manipulate up to 512 sockets in a select call (i.e.
** handle up to about 250 simultaneous tunnels). It can be overridden at
** compile time.
*/
#define FD_SETSIZE 512
#endif
#include <windows.h>
#include <io.h>
#include <winsock.h>
#include <process.h>
#include <mmsystem.h>
#include "getopt.h"
#define DFLT_SHELL "c:\\winnt\\system32\\cmd.exe"
#define getpid() GetCurrentProcessId()
#define FILE_SEP_CHAR '\\'
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#define strcasecmp _stricmp
#undef ETIMEDOUT
#define ETIMEDOUT WSAETIMEDOUT
#undef EWOULDBLOCK
#define EWOULDBLOCK WSAEWOULDBLOCK
#undef EINPROGRESS
#define EINPROGRESS WSAEINPROGRESS
/*
** Winsock state data
*/
static struct WSAData WsaState;
/*
** Global Mutexes and Condition Variables
*/
CRITICAL_SECTION Mutex[MUTEX_MAX];
HANDLE Condition[COND_MAX];
extern void svcRun(char *name, VOID (*function)(VOID *), VOID *arg);
extern int svcInstall(char *name, char *configFile);
extern int svcRemove(char *name);
#else /* !WIN32 */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/socket.h>
#ifndef DONT_HAVE_SELECT_H
#include <sys/select.h>
#endif
#include <sys/stat.h>
#include <sys/wait.h>
#include <dirent.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <syslog.h>
#ifdef USE_UDP_SPOOFING
#include <libnet.h>
#endif
#include <pwd.h>
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
#define DFLT_SHELL "/bin/sh"
#define FILE_SEP_CHAR '/'
#define closesocket(fd) close((fd))
#ifdef HAVE_PTHREADS
#include <pthread.h>
pthread_mutex_t Mutex[MUTEX_MAX];
pthread_cond_t Condition[COND_MAX];
pthread_attr_t ThreadAttr;
#endif
#endif
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
/**************************\
** **
** Constants and Macros **
** **
\**************************/
#define MAX_BUF_SIZE 16383 /* Maximum network buffer size (< 2^14) */
#define DFLT_BUF_SIZE 8192 /* Default network buffer size */
#define MAX_LINE_SIZE 1024 /* Maximum file line size */
#define MAX_KEY_BYTES ((BF_ROUNDS + 2)*4) /* Maximum size of Blowfish key */
#define MIN_KEY_BYTES 5 /* Minimum key length */
#define MAX_LISTEN 5 /* Depth of listen queue */
#define MAX_INCLUDE 5 /* Maximum depth of include files */
#define MAX_KEYGEN_LEVEL 2 /* Maximum key generation strength level */
#define HASH_STR_SIZE 41 /* Size of SHA hash string including null */
#define TIMESTAMP_SIZE 20 /* Size of YYYY-dd-mm-HH:MM:SS timestamp */
#define CHALLENGE_SIZE 4 /* Size of challenge data */
#define THE_ANSWER 42 /* To Life, the Universe and Everything */
#define CHALLENGE_SIZE 4 /* Size of challenge data */
#define NONCE_SIZE 8 /* Size of nonce data */
#ifndef THREAD_STACK_SIZE
#define THREAD_STACK_SIZE 65536 /* Stack size for threads */
#endif
#define MIN_THREAD_STACK_KB 16 /* Minimum allowable thread stack in kb */
#define CMP_OVERHEAD 250 /* Maximum overhead on 16k message */
#define CMP_MINIMUM 32 /* Minimum message size to attempt compression */
#define IP_BUF_SIZE 16 /* Size of buffer for IP address string */
/*
** Information about the compression algorithm and level is encoded in
** a single unsigned short value. The high 8 bits are the algorithm and
** the low eight bits the level. Note that the values used ensure that
** taken as a 16-bit quantity all bzip2 values are greater than all
** zlib values. This fact is used so that, in effect, bzip2 compression
** is considered "stronger" than zlib.
*/
#define CMPTYPE_ZLIB 0x0
#define CMPTYPE_BZIP2 0x1
#define GET_CMPTYPE(z) (((z) >> 8) & 0xff)
#define SET_CMPTYPE(z, t) ((z) | ((t) << 8))
#define GET_CMPLEVEL(z) ((z) & 0xff)
#define SET_CMPLEVEL(z, l) ((z) | ((l) & 0xff))
/*
** Each message that Zebedee transmits is preceded by an unsigned short
** value (in big-endian format). The top two bits flag whether the message
** is encrypted and compressed. The lower 14 bits define the payload size
** (which must be no greater than MAX_BUF_SIZE).
*/
#define FLAG_COMPRESSED 0x1
#define FLAG_ENCRYPTED 0x2
#define CHECKSUM_NONE 0
#define CHECKSUM_ADLER 1
#define CHECKSUM_CRC32 2
#define CHECKSUM_SHA 3
#define CHECKSUM_MAX CHECKSUM_SHA
#define CHECKSUM_ADLER_LEN 4 /* ADLER32 32-bit checksum */
#define CHECKSUM_CRC32_LEN 4 /* CRC32 32-bit checksum */
#define CHECKSUM_SHA_LEN 20 /* SHA 160-bit message digest */
#define CHECKSUM_MAX_LEN CHECKSUM_SHA_LEN /* Max message digest */
#define CHECKSUM_INVALID 0xffff
#define GET_FLAGS(x) (((x) >> 14) & 0x3)
#define SET_FLAGS(x, f) ((x) | ((f) << 14))
#define GET_SIZE(x) ((x) & 0x3fff)
#define DFLT_GENERATOR "2" /* Default generator value */
#define DFLT_MODULUS /* Default modulus value */ \
"f488fd584e49dbcd20b49de49107366b336c380d451d0f7c88b31c7c5b2d8ef6" \
"f3c923c043f0a55b188d8ebb558cb85d38d334fd7c175743a31d186cde33212c" \
"b52aff3ce1b1294018118d7c84a70a72d686c40319c807297aca950cd9969fab" \
"d00a509b0246d3083d66a45d419f9c7cbd894b221926baaba25ec355e92f78c7"
#define DFLT_CMP_LEVEL SET_CMPLEVEL(CMPTYPE_ZLIB, 6)
#define DFLT_KEY_BITS 128 /* Default key size */
#define DFLT_TCP_PORT 0x2EBD /* Port on which TCP-mode server listens */
#define DFLT_UDP_PORT 0x2BDE /* Port on which UDP-mode server listens */
#define DFLT_KEY_LIFETIME 3600 /* Reuseable keys last an hour */
#define DFLT_TCP_TIMEOUT 0 /* Default never close idle TCP tunnels */
#define DFLT_UDP_TIMEOUT 300 /* Close UDP tunnels after 5 mins */
#define DFLT_CONNECT_TIMEOUT 300 /* Timeout for making/accepting connection */
#define PROTOCOL_V100 0x0100 /* The original and base */
#define PROTOCOL_V101 0x0101 /* Extended buffer size */
#define PROTOCOL_V102 0x0102 /* Optionally omit key exchange */
#define PROTOCOL_V200 0x0200 /* Header, UDP and reusable key support */
#define PROTOCOL_V201 0x0201 /* Remote target selection */
#define PROTOCOL_V202 0x0202 /* Lock of protocol negotiation, checksum and source based targetting */
#define DFLT_PROTOCOL PROTOCOL_V202
#define TOKEN_NEW 0xffffffff /* Request new token allocation */
#define TOKEN_EXPIRE_GRACE 10 /* CurrentToken valid until this close to expiry */
#define HDR_SIZE_V200 22 /* Size of V200 protocol header message */
#define HDR_SIZE_V201 26 /* Size of V201 protocol header message */
#define HDR_SIZE_V202 28 /* Size of V202 protocol header message */
#define HDR_SIZE_MIN HDR_SIZE_V200
#define HDR_SIZE_MAX HDR_SIZE_V202
#define HDR_OFFSET_FLAGS 0 /* Offset of flags (TCP vs UDP) */
#define HDR_OFFSET_MAXSIZE 2 /* Offset of max message size */
#define HDR_OFFSET_CMPINFO 4 /* Offset of compression info */
#define HDR_OFFSET_PORT 6 /* Offset of port request */
#define HDR_OFFSET_KEYLEN 8 /* Offset of key length */
#define HDR_OFFSET_TOKEN 10 /* Offset of key token */
#define HDR_OFFSET_NONCE 14 /* Offset of nonce value */
#define HDR_OFFSET_TARGET 22 /* Offset of target host address */
#define HDR_OFFSET_CHECKSUM 26 /* Offset of checksum type */
#define HDR_FLAG_UDPMODE 0x1 /* Operate in UDP mode */
#define ENDPTLIST_TCP 0x1 /* TCP-type port list */
#define ENDPTLIST_UDP 0x2 /* UDP-type port list */
#define ENDPTLIST_ANY (ENDPTLIST_TCP | ENDPTLIST_UDP)
/***************************\
** **
** Data Type Definitions **
** **
\***************************/
/*
** The BFState_t structure holds all the state information necessary
** to encrypt one data-stream (unidirectional).
*/
#define INIT_IVEC "Time4Bed" /* ... said Zebedee. Boing! */
typedef struct
{
BF_KEY key;
unsigned char iVec[8];
int pos;
unsigned char cryptBuf[MAX_BUF_SIZE];
}
BFState_t;
/*
** The EndPtList_t structure holds the information about a network end-point,
** or range of similar end-point with ports from "lo" to "hi". A single
** end-point value has both hi and lo set the same. A linked list of these
** structures holds information about a set of ranges.
**
** The host element holds the name of the host associated with the end-
** point, addr the matching IP address and addrList, a list of alias
** addresses. The mask is used if an address mask was specified. The type
** is a bitmask combination of ENDPTLIST_TCP and ENDPTLIST_UDP. The idFile
** is the name of the identity file that should be checked for connections
** to this endpoint. If peer is not NULL then it is a list of valid
** peer connections for this endpoint.
*/
typedef struct EndPtList_s
{
unsigned short lo;
unsigned short hi;
char *host;
struct sockaddr_in addr;
struct in_addr *addrList;
struct EndPtList_s *next;
unsigned long mask;
unsigned short type;
char *idFile;
struct EndPtList_s *peer;
}
EndPtList_t;
/*
** The MsgBuf_t is the general buffer used by the low-level readMessage
** and writeMessage routines. It holds (nearly) all of the state for
** a single connection.
*/
typedef struct MsgBuf_s
{
unsigned short maxSize; /* Max size of data buffer read/writes */
unsigned short size; /* Size of current message */
unsigned char data[MAX_BUF_SIZE + CHECKSUM_MAX_LEN]; /* Data buffer */
unsigned char tmp[MAX_BUF_SIZE + CMP_OVERHEAD + CHECKSUM_MAX_LEN]; /* Temporary work space */
unsigned short cmpInfo; /* Compression level and type */
BFState_t *bfRead; /* Encryption context for reads */
BFState_t *bfWrite; /* Encryption context for writes */
unsigned long readCount; /* Number of reads */
unsigned long bytesIn; /* Actual data bytes from network */
unsigned long expBytesIn; /* Expanded data bytes in */
unsigned long writeCount; /* Number of writes */
unsigned long bytesOut; /* Actual data bytes to network */
unsigned long expBytesOut; /* Expanded data bytes out */
unsigned short checksumLevel; /* Current checksum mode, 0 if none */
unsigned short checksumLen; /* Current checksum length, 0 if none */
unsigned char inSeed[CHECKSUM_MAX_LEN]; /* Seed for input checksum */
unsigned char outSeed[CHECKSUM_MAX_LEN]; /* Seed for output checksum */
}
MsgBuf_t;
/*
** These enumerated type values are used to indicate the destination of
** log messages.
*/
typedef enum
{
LOGFILE_NULL,
LOGFILE_SYSLOG,
LOGFILE_LOCAL
}
LogType_t;
/*
** The KeyInfo_t structure holds the mapping between a key "token" value
** used to request the reuse of a previously established shared secret
** key and the key value itself. These structures are strung together in
** a doubly linked list.
*/
typedef struct KeyInfo_s
{
unsigned long token;
char *key;
time_t expiry;
struct KeyInfo_s *prev;
struct KeyInfo_s *next;
}
KeyInfo_t;
/*
** This structure is used to pass the arguments to the main "handler"
** thread routines (client() and server()).
*/
typedef struct FnArgs_s
{
int fd;
unsigned short port;
struct sockaddr_in addr;
int listenFd;
int inLine;
int udpMode;
}
FnArgs_t;
/*
** This structure is used in UDP mode to find the local socket for
** the handler for traffic coming from a specific client.
*/
typedef struct HndInfo_s
{
unsigned long id;
int fd;
struct sockaddr_in fromAddr;
struct sockaddr_in localAddr;
struct HndInfo_s *prev;
struct HndInfo_s *next;
}
HndInfo_t;
/*****************\
** **
** Global Data **
** **
\*****************/
/*
** Note: Although this data is global most of it is not protected by mutex
** locks because once set in the start-up phases of the program it is
** read-only by the rest of the routines.
*/
FILE *LogFileP = NULL; /* File handle for log file (NULL => stderr) */
LogType_t LogFileType = LOGFILE_LOCAL; /* Type of log file */
unsigned short LogLevel = 1; /* Message verbosity level */
char *Program = "zebedee"; /* Program name (argv[0]) */
char *Generator = ""; /* DH generator hex string ("" => default) */
char *Modulus = ""; /* DH modulus hex string ("" => default) */
char *PrivateKey = NULL; /* Private key hex string */
unsigned short KeyLength = DFLT_KEY_BITS; /* Key length in bits */
unsigned short MinKeyLength = 0; /* Minimum allowed key length */
unsigned short CompressInfo = DFLT_CMP_LEVEL; /* Compression type and level */
int IsDetached = 1; /* Flag true if program should run detached */
int IsServer = 0; /* Flag true if program is a server */
int Debug = 0; /* Debug mode -- single threaded server */
char *CommandString = NULL; /* Command string to execute (client) */
unsigned short ServerPort = 0; /* Port on which server listens */
EndPtList_t *ClientPorts = NULL; /* Ports on which client listens */
EndPtList_t *TargetPorts = NULL; /* Target port to which to tunnel */
char *ServerHost = NULL; /* Name of host on which server runs */
char *TargetHost = "localhost"; /* Default host to which tunnels are targeted */
char *IdentityFile = NULL; /* Name of identity file to check, if any */
EndPtList_t *AllowedTargets = NULL; /* List of allowed target hosts/ports */
EndPtList_t *AllowedDefault = NULL; /* List of default allowed redirection ports */
EndPtList_t *AllowedPeers = NULL; /* List of allowed peer addresses/ports */
char *KeyGenCmd = NULL; /* Key generator command string */
unsigned short KeyGenLevel = MAX_KEYGEN_LEVEL; /* Key generation strength level */
int LockProtocol = 0; /* Is procol negotiation locked? */
int DropUnknownProtocol = 0; /* Allow any request? */
int TimestampLog = 0; /* Should messages have timestamps? */
int MultiUse = 1; /* Client handles multiple connections? */
unsigned short MaxBufSize = DFLT_BUF_SIZE; /* Maximum buffer size */
unsigned long CurrentToken = 0; /* Client reuseable key token */
unsigned short KeyLifetime = DFLT_KEY_LIFETIME; /* Key lifetime in seconds */
unsigned short ChecksumLevel = CHECKSUM_CRC32; /* Type of checksum embedded in the message. Default CRC32 */
unsigned short MinChecksumLevel = CHECKSUM_NONE;
int UdpMode = 0; /* Run in UDP mode */
int TcpMode = 1; /* Run in TCP mode */
unsigned short TcpTimeout = DFLT_TCP_TIMEOUT; /* TCP inactivity timeout */
unsigned short UdpTimeout = DFLT_UDP_TIMEOUT; /* UDP inactivity timeout */
char *ListenIp = NULL; /* IP address on which to listen */
int ListenMode = 0; /* True if client waits for server connection */
char *ClientHost = NULL; /* Server initiates connection to client */
int ListenSock = -1; /* Socket on which to listen for server */
unsigned short ServerConnectTimeout = DFLT_CONNECT_TIMEOUT; /* Timeout for server connections */
unsigned short AcceptConnectTimeout = DFLT_CONNECT_TIMEOUT; /* Timeout for client to accept connections */
unsigned short TargetConnectTimeout = DFLT_CONNECT_TIMEOUT; /* Timeout for connection to target */
unsigned short ConnectAttempts = 1; /* Number of server-initiated connection attempts */
unsigned short ReadTimeout = 0; /* Timeout for remote data reads */
int ActiveCount = 0; /* Count of active handlers */
char *ProxyHost = NULL; /* HTTP proxy host, if used */
char *ProxyAuth = NULL; /* HTTP proxy username:password, if used */
unsigned short ProxyPort = 0; /* HTTP proxy port, if used */
int Transparent = 0; /* Try to propagate the client IP address */
char *FieldSeparator = NULL; /* Input field separator character */
char *SharedKey = NULL; /* Static shared secret key */
char *SharedKeyGenCmd = NULL; /* Command to generate shared secret key */
int DumpData = 0; /* Dump out message contents only if true */
#ifndef WIN32
uid_t ProcessUID = -1; /* User id to run zebedee process if started as root */
gid_t ProcessGID = -1; /* Group id to run zebedee process if started as root */
#endif
long ThreadStackSize = THREAD_STACK_SIZE; /* As it says */
unsigned short BugCompatibility = 0; /* Be nice to development users */
unsigned short MaxConnections = 0; /* Maximum number of simultaneous connections */
int InteractiveMode = 0;
extern char *optarg; /* From getopt */
extern int optind; /* From getopt */
/*
** The following global data-structure ARE modified during normal operation
** and are protected by mutexes.
**
** The ClientKeyList and ServerKeyList are protected by the MUTEX_KEYLIST
** and the HandlerList by MUTEX_HNDLIST.
*/
KeyInfo_t ClientKeyList = { 0, NULL, (time_t)0, NULL, NULL };
/* Client-side list of token->key mappings */
KeyInfo_t ServerKeyList = { 0, NULL, (time_t)0, NULL, NULL };
/* Server-side list of token->key mappings */
HndInfo_t HandlerList; /* List of address to handler mappings */
/*************************\
** **
** Function Prototypes **
** **
\*************************/
void threadInit(void);
void mutexInit(void);
void mutexLock(int num);
void mutexUnlock(int num);
void conditionInit(void);
void conditionSignal(int num);
void conditionWait(int condNum, int mutexNum);
unsigned long threadPid(void);
unsigned long threadTid(void);
int incrActiveCount(int num);
void waitForInactivity(void);
void logToSystemLog(unsigned short level, char *msg);
void timestamp(char *timeBuf, int local);
void message(unsigned short level, int err, char *fmt, ...);
void dumpData(const char *prefix, unsigned char *data, unsigned short size);
int readData(int fd, unsigned char *buffer, unsigned short size);
int readUShort(int fd, unsigned short *resultP);
int writeData(int fd, unsigned char *buffer, unsigned short size);
int writeUShort(int fd, unsigned short value);
MsgBuf_t *makeMsgBuf(unsigned short maxSize, unsigned short cmpInfo, unsigned short checksumLevel);
void freeMsgBuf(MsgBuf_t *msg);
void getMsgBuf(MsgBuf_t *msg, void *buffer, unsigned short size);
void setMsgBuf(MsgBuf_t *msg, void *buffer, unsigned short size);
int readMessage(int fd, MsgBuf_t *msg, unsigned short thisSize);
int writeMessage(int fd, MsgBuf_t *msg);
int requestResponse(int fd, unsigned short request, unsigned short *responseP);
int getHostAddress(const char *host, struct sockaddr_in *addrP, struct in_addr **addrList, unsigned long *maskP);
char *ipString(struct in_addr addr, char *buf);
int makeConnection(const char *host, const unsigned short port, int udpMode, int useProxy, struct sockaddr_in *fromAddrP, struct sockaddr_in *toAddrP, unsigned short timeout);
int proxyConnection(const char *host, const unsigned short port, struct sockaddr_in *localAddrP, unsigned short timeout);
int sendSpoofed(int fd, char *buf, int len, struct sockaddr_in *toAddrP, struct sockaddr_in *fromAddrP);
int makeListener(unsigned short *portP, char *listenIp, int udpMode, int listenQueue);
void setNoLinger(int fd);
void setKeepAlive(int fd);
void setNonBlocking(int fd, unsigned long nonBlock);
void setNoDelay(int fd);
int acceptConnection(int listenFd, const char *host, int loop, unsigned short timeout);
int socketIsUsable(int sock);
void headerSetUShort(unsigned char *hdrBuf, unsigned short value, int offset);
void headerSetULong(unsigned char *hdrBuf, unsigned long value, int offset);
unsigned short headerGetUShort(unsigned char *hdrBuf, int offset);
unsigned long headerGetULong(unsigned char *hdrBuf, int offset);
BFState_t *setupBlowfish(char *keyStr, unsigned short keyBits);
char *generateKey(struct sockaddr_in *peerAddrP, struct sockaddr_in *targetAddrP, unsigned short targetPort);
char *runKeyGenCommand(char *keyGenCmd, struct sockaddr_in *peerAddrP, struct sockaddr_in *targetAddrP, unsigned short targetPort);
void generateNonce(unsigned char *);
char *generateSessionKey(char *secretKey, unsigned char *cNonce, unsigned char *sNonce, unsigned short bits);
unsigned short hexStrToBits(char *hexStr, unsigned short bits, unsigned char *bitVec);
char *diffieHellman(char *genStr, char *modStr, char *expStr);
void makeChallenge(unsigned char *challenge);
void challengeAnswer(unsigned char *challenge);
int clientPerformChallenge(int serverFd, MsgBuf_t *msg);
int serverPerformChallenge(int clientFd, MsgBuf_t *msg);
void freeKeyInfo(KeyInfo_t *info);
char *findKeyByToken(KeyInfo_t *list, unsigned long token, struct sockaddr_in *peerAddrP, struct sockaddr_in *targetAddrP, unsigned short targetPort);
void addKeyInfoToList(KeyInfo_t *list, unsigned long token, char *key);
unsigned long generateToken(KeyInfo_t *list, unsigned long oldToken);
unsigned long getCurrentToken(void);
int spawnCommand(unsigned short port, char *cmdFormat);
int filterLoop(int localFd, int remoteFd, MsgBuf_t *msgBuf,
struct sockaddr_in *toAddrP, struct sockaddr_in *fromAddrP,
int replyFd, int udpMode);
void hashStrings(char *hashBuf, ...);
void hashFile(char *hashBuf, char *fileName);
int checkIdentity(char *idFile, char *generator, char *modulus, char *key);
char *generateIdentity(char *generator, char *modulus, char *exponent);
unsigned long spawnHandler(void (*handler)(FnArgs_t *), int listenFd, int clientFd, int inLine, struct sockaddr_in *addrP, int udpMode);
int findHandler(struct sockaddr_in *fromAddrP, struct sockaddr_in *localAddrP);
void addHandler(struct sockaddr_in *fromAddrP, unsigned long id, int fd, struct sockaddr_in *localAddrP);
void removeHandler(struct sockaddr_in *addrP);
void clientListener(EndPtList_t *localPorts);
int makeClientListeners(EndPtList_t *ports, fd_set *listenSetP, int udpMode);
void client(FnArgs_t *argP);
void prepareToDetach(void);
void makeDetached(void);
void serverListener(unsigned short *portPtr);
void serverInitiator(unsigned short *portPtr);
int allowRedirect(unsigned short port, struct sockaddr_in *addrP, struct sockaddr_in *peerAddrP, int udpMode, char **hostP, char **idFileP);
int checkPeerForSocket(int fd, struct sockaddr_in *addrP);
int checkPeerAddress(struct sockaddr_in *addrP, EndPtList_t *peerList);
int countPorts(EndPtList_t *list);
unsigned short mapPort(unsigned short localPort, char **hostP, struct sockaddr_in *addrP);
void server(FnArgs_t *argP);
unsigned short scanPortRange(const char *str, unsigned short *loP,
unsigned short *hiP, unsigned short *typeP);
void setBoolean(char *value, int *resultP);
void setUShort(char *value, unsigned short *resultP);
void setPort(char *value, unsigned short *resultP);
EndPtList_t *newEndPtList(unsigned short lo, unsigned short hi, char *host, char *idFile, char *peer, unsigned short type);
EndPtList_t *allocEndPtList(unsigned short lo, unsigned short hi, char *host, char *idFile, char *peer, struct in_addr *addrP, struct in_addr *addrList, unsigned long mask, unsigned short type);
void setEndPtList(char *value, EndPtList_t **listP, char *host, char *idFile, char *peer, int zeroOk);
void setTarget(char *value);
void setChecksum(char *value, unsigned short *resultP);
void setTunnel(char *value);
void setAllowedPeer(char *value, EndPtList_t *peerList);
void setString(char *value, char **resultP);
void setLogFile(char *newFile);
void setCmpInfo(char *value, unsigned short *resultP);
void setStackSize(char *value);
void setRunAsUser(const char *user);
void readConfigFile(const char *fileName, int level);
int parseConfigLine(const char *lineBuf, int level);
char *cleanHexString(char *str);
void usage(void);
void sigpipeCatcher(int sig);
void sigchldCatcher(int sig);
void sigusr1Catcher(int sig);
void runAsUser(const char *user);
void switchUser(void);
/*************************************\
** **
** Thread Synchronisation Routines **
** **
\*************************************/
/*
** threadInit
**
** Set up global mutexes, condition variables and thread attributes. Must
** be called before any other thread routines.
*/
void
threadInit(void)
{
mutexInit();
conditionInit();
#if defined(HAVE_PTHREADS)
pthread_attr_init(&ThreadAttr);
pthread_attr_setstacksize(&ThreadAttr, (size_t)ThreadStackSize);
pthread_attr_setdetachstate(&ThreadAttr, PTHREAD_CREATE_DETACHED);
#endif
}
/*
** mutexInit
**
** Initialise global mutexes.
*/
void
mutexInit(void)
{
#if defined(WIN32)
int i;
for (i = 0; i < MUTEX_MAX; i++)
{
InitializeCriticalSection(&(Mutex[i]));
}
#elif defined(HAVE_PTHREADS)
int i;
for (i = 0; i < MUTEX_MAX; i++)
{
pthread_mutex_init(&(Mutex[i]), NULL);
}
#endif
}
/*
** mutexLock
**
** Lock a global mutex
*/
void
mutexLock(int num)
{
assert(num < MUTEX_MAX);
#if defined(WIN32)
EnterCriticalSection(&(Mutex[num]));
#elif defined(HAVE_PTHREADS)
pthread_mutex_lock(&(Mutex[num]));
#endif
}
/*
** mutexUnlock
**
** Unlock a global mutex
*/
void
mutexUnlock(int num)
{
assert(num < MUTEX_MAX);
#if defined(WIN32)
LeaveCriticalSection(&(Mutex[num]));
#elif defined(HAVE_PTHREADS)
pthread_mutex_unlock(&(Mutex[num]));
#endif
}
/*
** conditionInit
**
** Initialise global condition variables.
*/
void
conditionInit(void)
{
#if defined(WIN32)
int i;
for (i = 0; i < COND_MAX; i++)
{
Condition[i] = CreateEvent(NULL, /* No security attributes */
TRUE, /* Manual reset */
FALSE, /* Initially cleared */
NULL); /* No name */
}
#elif defined(HAVE_PTHREADS)
int i;
for (i = 0; i < COND_MAX; i++)
{
pthread_cond_init(&(Condition[i]), NULL);
}
#endif
}
/*
** conditionSignal
**
** Signal a condition variable
*/
void
conditionSignal(int num)
{
assert(num < COND_MAX);
#if defined(WIN32)
PulseEvent(Condition[num]);
#elif defined(HAVE_PTHREADS)
pthread_cond_broadcast(&(Condition[num]));
#endif
}
/*
** conditionWait
**
** Wait on a condition variable. Note the specified mutex must be held
** before calling this routine. It will also be held on exit.
*/
void
conditionWait(int condNum, int mutexNum)
{
assert(condNum < COND_MAX && mutexNum < MUTEX_MAX);
#if defined(WIN32)
LeaveCriticalSection(&(Mutex[mutexNum]));
WaitForSingleObject(Condition[condNum], INFINITE);
EnterCriticalSection(&(Mutex[mutexNum]));
#elif defined(HAVE_PTHREADS)
pthread_cond_wait(&(Condition[condNum]), &(Mutex[mutexNum]));
#endif
}
/*
** threadPid
**
** Return the current process ID
*/
unsigned long
threadPid(void)
{
#ifdef WIN32
return (unsigned long)GetCurrentProcessId();
#else
return (unsigned long)getpid();
#endif
}
/*
** threadTid
**
** Return the current thread ID
*/
unsigned long
threadTid(void)
{
#ifdef WIN32
return (unsigned long)GetCurrentThreadId();
#elif defined(HAVE_PTHREADS)
return (unsigned long)pthread_self();
#else
return 0;
#endif
}
/*
** incrActiveCount
**
** This increments or decrements the count of active handler threads.
** If the count reaches zero it also signals the COND_ACTIVE condition
** variable.
*/
int
incrActiveCount(int num)
{
mutexLock(MUTEX_ACTIVE);
ActiveCount += num;
if (ActiveCount == 0)
{
conditionSignal(COND_ACTIVE);
}
mutexUnlock(MUTEX_ACTIVE);
return ActiveCount;
}
/*
** waitForInactivity
**
** This routine blocks until the "ActiveCount" global variable reaches
** zero, indicating no more running handler threads.
*/
void
waitForInactivity(void)
{
#if defined(WIN32) || defined(HAVE_PTHREADS)
mutexLock(MUTEX_ACTIVE);
while (ActiveCount)
{
conditionWait(COND_ACTIVE, MUTEX_ACTIVE);
}
mutexUnlock(MUTEX_ACTIVE);
#else
while (waitpid(-1, NULL, 0) > 0 || errno != ECHILD) /* Wait for children */;
#endif
}
/*********************\
** **
** Message Logging **
** **
\*********************/
/*
** timestamp
**
** Generate a time-stamp string
*/
void
timestamp(char *timeBuf, int local)
{
time_t now;
struct tm *tmPtr;
/* localtime()/gmtime are not thread-safe */
mutexLock(MUTEX_IO);
time(&now);
if (local)
{
tmPtr = localtime(&now);
}
else
{
tmPtr = gmtime(&now);
}
strftime(timeBuf, TIMESTAMP_SIZE, "%Y-%m-%d-%H:%M:%S", tmPtr);
mutexUnlock(MUTEX_IO);
}
/*
** logToSystemLog
**
** Write a message to the system logging facility. On Windows it goes to
** the system application event log. Elsewhere is uses syslog().
*/
void
logToSystemLog(unsigned short level, char *msg)
{
#ifdef WIN32
HANDLE eventHandle;
char *strings[2];
eventHandle = RegisterEventSource(NULL, Program);
strings[0] = msg;
strings[1] = NULL;
if (eventHandle != NULL)
{
ReportEvent(eventHandle, /* Handle of event source */
(level ? EVENTLOG_INFORMATION_TYPE :
EVENTLOG_ERROR_TYPE), /* Event type */
(WORD)level, /* Event category */
0, /* Event ID */
NULL, /* User SID */
1, /* Number of message strings */
0, /* Bytes of binary data */
(const char **)strings, /* Array of message strings */
NULL); /* No binary data */
DeregisterEventSource(eventHandle);
}
#else
int logLevel;
/*
** Messages at level 0 are errors, 1 is notice, 2 informational
** and everything else is classed as debug.
*/
switch (level)
{
case 0:
logLevel = LOG_ERR;
break;
case 1: