alias_ftp.c File Reference

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/ctype.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/libalias/alias.h>
#include <netinet/libalias/alias_local.h>
#include <netinet/libalias/alias_mod.h>

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Macros
#define	FTP_CONTROL_PORT_NUMBER   21
#define	FTP_CONTROL_PORT_NUMBER   21
#define	MAX_MESSAGE_SIZE   128
#define	WAIT_CRLF   0x01

Enumerations
enum	ftp_message_type {   FTP_PORT_COMMAND , FTP_EPRT_COMMAND , FTP_227_REPLY , FTP_229_REPLY ,   FTP_UNKNOWN_MESSAGE }

Functions
	__FBSDID ("$FreeBSD$")
static void	AliasHandleFtpOut (struct libalias *, struct ip *, struct alias_link *, int maxpacketsize)
static void	AliasHandleFtpIn (struct libalias *, struct ip *, struct alias_link *)
static int	fingerprint_out (struct libalias *la, struct alias_data *ah)
static int	fingerprint_in (struct libalias *la, struct alias_data *ah)
static int	protohandler_out (struct libalias *la, struct ip *pip, struct alias_data *ah)
static int	protohandler_in (struct libalias *la, struct ip *pip, struct alias_data *ah)
static int	mod_handler (module_t mod, int type, void *data)
	DECLARE_MODULE (alias_ftp, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND)
	MODULE_VERSION (alias_ftp, 1)
	MODULE_DEPEND (alias_ftp, libalias, 1, 1, 1)
static int	ParseFtpPortCommand (struct libalias *la, char *, int)
static int	ParseFtpEprtCommand (struct libalias *la, char *, int)
static int	ParseFtp227Reply (struct libalias *la, char *, int)
static int	ParseFtp229Reply (struct libalias *la, char *, int)
static void	NewFtpMessage (struct libalias *la, struct ip *, struct alias_link *, int, int)

Variables
struct proto_handler	handlers []
static moduledata_t	alias_mod

Macro Definition Documentation

FTP_CONTROL_PORT_NUMBER [1/2]

#define FTP_CONTROL_PORT_NUMBER   21

Definition at line 197 of file alias_ftp.c.

FTP_CONTROL_PORT_NUMBER [2/2]

#define FTP_CONTROL_PORT_NUMBER   21

Definition at line 197 of file alias_ftp.c.

MAX_MESSAGE_SIZE

#define MAX_MESSAGE_SIZE   128

Definition at line 198 of file alias_ftp.c.

WAIT_CRLF

#define WAIT_CRLF   0x01

Definition at line 201 of file alias_ftp.c.

Enumeration Type Documentation

ftp_message_type

enum ftp_message_type

Enumerator
FTP_PORT_COMMAND
FTP_EPRT_COMMAND
FTP_227_REPLY
FTP_229_REPLY
FTP_UNKNOWN_MESSAGE

Definition at line 203 of file alias_ftp.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

AliasHandleFtpIn()

static void AliasHandleFtpIn ( struct libalias *  la, struct ip *  pip, struct alias_link *  lnk  )

static

Definition at line 281 of file alias_ftp.c.

References AddLink(), FTP_CONTROL_PORT_NUMBER, GET_ALIAS_PORT, GetAliasAddress(), GetOriginalAddress(), GetProtocolFlags(), ip::ip_hl, ip::ip_len, IPPROTO_TCP, MAX_MESSAGE_SIZE, ParseFtpEprtCommand(), ParseFtpPortCommand(), SetProtocolFlags(), libalias::true_addr, libalias::true_port, and WAIT_CRLF.

Referenced by protohandler_in().

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AliasHandleFtpOut()

static void AliasHandleFtpOut ( struct libalias *  la, struct ip *  pip, struct alias_link *  lnk, int  maxpacketsize  )

static

Definition at line 218 of file alias_ftp.c.

References FTP_227_REPLY, FTP_229_REPLY, FTP_CONTROL_PORT_NUMBER, FTP_EPRT_COMMAND, FTP_PORT_COMMAND, FTP_UNKNOWN_MESSAGE, GetProtocolFlags(), ip::ip_hl, ip::ip_len, MAX_MESSAGE_SIZE, NewFtpMessage(), ParseFtp227Reply(), ParseFtp229Reply(), ParseFtpEprtCommand(), ParseFtpPortCommand(), in_addr::s_addr, SetProtocolFlags(), libalias::true_addr, and WAIT_CRLF.

Referenced by protohandler_out().

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DECLARE_MODULE()

DECLARE_MODULE	(	alias_ftp	,
		alias_mod	,
		SI_SUB_DRIVERS	,
		SI_ORDER_SECOND
	)

fingerprint_in()

static int fingerprint_in ( struct libalias *  la, struct alias_data *  ah  )

static

Definition at line 122 of file alias_ftp.c.

References alias_data::dport, FTP_CONTROL_PORT_NUMBER, alias_data::lnk, and alias_data::sport.

fingerprint_out()

static int fingerprint_out ( struct libalias *  la, struct alias_data *  ah  )

static

Definition at line 110 of file alias_ftp.c.

References alias_data::dport, FTP_CONTROL_PORT_NUMBER, alias_data::lnk, alias_data::maxpktsize, and alias_data::sport.

mod_handler()

static int mod_handler ( module_t  mod, int  type, void *  data  )

static

Definition at line 165 of file alias_ftp.c.

References handlers, LibAliasAttachHandlers(), and LibAliasDetachHandlers().

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MODULE_DEPEND()

MODULE_DEPEND	(	alias_ftp	,
		libalias	,
		1	,
		1	,
		1
	)

MODULE_VERSION()

MODULE_VERSION	(	alias_ftp	,
		1
	)

NewFtpMessage()

static void NewFtpMessage ( struct libalias *  la, struct ip *  pip, struct alias_link *  lnk, int  maxpacketsize, int  ftp_message_type  )

static

Definition at line 636 of file alias_ftp.c.

References AddLink(), AddSeq(), DifferentialChecksum(), FTP_227_REPLY, FTP_229_REPLY, FTP_EPRT_COMMAND, FTP_PORT_COMMAND, GET_ALIAS_PORT, GetAliasAddress(), GetAliasPort(), GetDeltaSeqOut(), GetDestAddress(), ip::ip_hl, ip::ip_len, ip::ip_sum, IPPROTO_TCP, alias_link::la, MAX_MESSAGE_SIZE, PunchFWHole(), in_addr::s_addr, SetAckModified(), libalias::true_addr, and libalias::true_port.

Referenced by AliasHandleFtpOut().

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ParseFtp227Reply()

static int ParseFtp227Reply ( struct libalias *  la, char *  sptr, int  dlen  )

static

Definition at line 494 of file alias_ftp.c.

References in_addr::s_addr, state, libalias::true_addr, and libalias::true_port.

Referenced by AliasHandleFtpOut().

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ParseFtp229Reply()

static int ParseFtp229Reply ( struct libalias *  la, char *  sptr, int  dlen  )

static

Definition at line 567 of file alias_ftp.c.

References state, and libalias::true_port.

Referenced by AliasHandleFtpOut().

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ParseFtpEprtCommand()

static int ParseFtpEprtCommand ( struct libalias *  la, char *  sptr, int  dlen  )

static

Definition at line 404 of file alias_ftp.c.

References in_addr::s_addr, state, libalias::true_addr, and libalias::true_port.

Referenced by AliasHandleFtpIn(), and AliasHandleFtpOut().

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ParseFtpPortCommand()

static int ParseFtpPortCommand ( struct libalias *  la, char *  sptr, int  dlen  )

static

Definition at line 331 of file alias_ftp.c.

References in_addr::s_addr, state, libalias::true_addr, and libalias::true_port.

Referenced by AliasHandleFtpIn(), and AliasHandleFtpOut().

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protohandler_in()

static int protohandler_in ( struct libalias *  la, struct ip *  pip, struct alias_data *  ah  )

static

Definition at line 140 of file alias_ftp.c.

References AliasHandleFtpIn(), and alias_data::lnk.

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protohandler_out()

static int protohandler_out ( struct libalias *  la, struct ip *  pip, struct alias_data *  ah  )

static

Definition at line 133 of file alias_ftp.c.

References AliasHandleFtpOut(), alias_data::lnk, and alias_data::maxpktsize.

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Variable Documentation

alias_mod

moduledata_t alias_mod

static

Initial value:

= {
       "alias_ftp", mod_handler, NULL
}

Definition at line 187 of file alias_ftp.c.

handlers

struct proto_handler handlers[]

Initial value:

= {
        {
          .pri = 80,
          .dir = OUT,
          .proto = TCP,
          .fingerprint = &fingerprint_out,
          .protohandler = &protohandler_out
        },
        {
          .pri = 80,
          .dir = IN,
          .proto = TCP,
          .fingerprint = &fingerprint_in,
          .protohandler = &protohandler_in
        },
        { EOH }
}

Definition at line 146 of file alias_ftp.c.

Referenced by mod_handler().