remote-ext.h

/*
 * Copyright (c) 2002 - 2003
 * NetGroup, Politecnico di Torino (Italy)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Politecnico di Torino nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */


#ifndef __REMOTE_EXT_H__
#define __REMOTE_EXT_H__


#ifndef HAVE_REMOTE
#error Please do not include this file directly. Just define HAVE_REMOTE and then include pcap.h
#endif

/*// Definition for Microsoft Visual Studio */
#if _MSC_VER > 1000
#pragma once
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*
 * \file remote-ext.h
 *
 * The goal of this file it to include most of the new definitions that should be
 * placed into the pcap.h file.
 *
 * It includes all new definitions (structures and functions like pcap_open().
 * Some of the functions are not really a remote feature, but, right now,
 * they are placed here.
 */



/*// All this stuff is public */
/*
 * \addtogroup remote_struct
 * \{
 */




/*
 * \brief Defines the maximum buffer size in which address, port, interface names are kept.
 *
 * In case the adapter name or such is larger than this value, it is truncated.
 * This is not used by the user; however it must be aware that an hostname / interface
 * name longer than this value will be truncated.
 */
#define PCAP_BUF_SIZE 1024


/*
 * \addtogroup remote_source_ID
 * \{
 */


/*
 * \brief Internal representation of the type of source in use (file,
 * remote/local interface).
 *
 * This indicates a file, i.e. the user want to open a capture from a local file.
 */
#define PCAP_SRC_FILE 2
/*
 * \brief Internal representation of the type of source in use (file,
 * remote/local interface).
 *
 * This indicates a local interface, i.e. the user want to open a capture from
 * a local interface. This does not involve the RPCAP protocol.
 */
#define PCAP_SRC_IFLOCAL 3
/*
 * \brief Internal representation of the type of source in use (file,
 * remote/local interface).
 *
 * This indicates a remote interface, i.e. the user want to open a capture from
 * an interface on a remote host. This does involve the RPCAP protocol.
 */
#define PCAP_SRC_IFREMOTE 4

/*
 * \}
 */



/* \addtogroup remote_source_string
 *
 * The formats allowed by the pcap_open() are the following:
 * - file://path_and_filename [opens a local file]
 * - rpcap://devicename [opens the selected device devices available on the local host, without using the RPCAP protocol]
 * - rpcap://host/devicename [opens the selected device available on a remote host]
 * - rpcap://host:port/devicename [opens the selected device available on a remote host, using a non-standard port for RPCAP]
 * - adaptername [to open a local adapter; kept for compability, but it is strongly discouraged]
 * - (NULL) [to open the first local adapter; kept for compability, but it is strongly discouraged]
 *
 * The formats allowed by the pcap_findalldevs_ex() are the following:
 * - file://folder/ [lists all the files in the given folder]
 * - rpcap:// [lists all local adapters]
 * - rpcap://host:port/ [lists the devices available on a remote host]
 *
 * Referring to the 'host' and 'port' parameters, they can be either numeric or literal. Since
 * IPv6 is fully supported, these are the allowed formats:
 *
 * - host (literal): e.g. host.foo.bar
 * - host (numeric IPv4): e.g. 10.11.12.13
 * - host (numeric IPv4, IPv6 style): e.g. [10.11.12.13]
 * - host (numeric IPv6): e.g. [1:2:3::4]
 * - port: can be either numeric (e.g. '80') or literal (e.g. 'http')
 *
 * Here you find some allowed examples:
 * - rpcap://host.foo.bar/devicename [everything literal, no port number]
 * - rpcap://host.foo.bar:1234/devicename [everything literal, with port number]
 * - rpcap://10.11.12.13/devicename [IPv4 numeric, no port number]
 * - rpcap://10.11.12.13:1234/devicename [IPv4 numeric, with port number]
 * - rpcap://[10.11.12.13]:1234/devicename [IPv4 numeric with IPv6 format, with port number]
 * - rpcap://[1:2:3::4]/devicename [IPv6 numeric, no port number]
 * - rpcap://[1:2:3::4]:1234/devicename [IPv6 numeric, with port number]
 * - rpcap://[1:2:3::4]:http/devicename [IPv6 numeric, with literal port number]
 *
 * \{
 */


/*
 * \brief String that will be used to determine the type of source in use (file,
 * remote/local interface).
 *
 * This string will be prepended to the interface name in order to create a string
 * that contains all the information required to open the source.
 *
 * This string indicates that the user wants to open a capture from a local file.
 */
#define PCAP_SRC_FILE_STRING "file://"
/*
 * \brief String that will be used to determine the type of source in use (file,
 * remote/local interface).
 *
 * This string will be prepended to the interface name in order to create a string
 * that contains all the information required to open the source.
 *
 * This string indicates that the user wants to open a capture from a network interface.
 * This string does not necessarily involve the use of the RPCAP protocol. If the
 * interface required resides on the local host, the RPCAP protocol is not involved
 * and the local functions are used.
 */
#define PCAP_SRC_IF_STRING "rpcap://"

/*
 * \}
 */





/*
 * \addtogroup remote_open_flags
 * \{
 */

/*
 * \brief Defines if the adapter has to go in promiscuous mode.
 *
 * It is '1' if you have to open the adapter in promiscuous mode, '0' otherwise.
 * Note that even if this parameter is false, the interface could well be in promiscuous
 * mode for some other reason (for example because another capture process with
 * promiscuous mode enabled is currently using that interface).
 * On on Linux systems with 2.2 or later kernels (that have the "any" device), this
 * flag does not work on the "any" device; if an argument of "any" is supplied,
 * the 'promisc' flag is ignored.
 */
#define PCAP_OPENFLAG_PROMISCUOUS		1

/*
 * \brief Defines if the data transfer (in case of a remote
 * capture) has to be done with UDP protocol.
 *
 * If it is '1' if you want a UDP data connection, '0' if you want
 * a TCP data connection; control connection is always TCP-based.
 * A UDP connection is much lighter, but it does not guarantee that all
 * the captured packets arrive to the client workstation. Moreover,
 * it could be harmful in case of network congestion.
 * This flag is meaningless if the source is not a remote interface.
 * In that case, it is simply ignored.
 */
#define PCAP_OPENFLAG_DATATX_UDP			2


/*
 * \brief Defines if the remote probe will capture its own generated traffic.
 *
 * In case the remote probe uses the same interface to capture traffic and to send
 * data back to the caller, the captured traffic includes the RPCAP traffic as well.
 * If this flag is turned on, the RPCAP traffic is excluded from the capture, so that
 * the trace returned back to the collector is does not include this traffic.
 */
#define PCAP_OPENFLAG_NOCAPTURE_RPCAP	4

/*
 * \brief Defines if the local adapter will capture its own generated traffic.
 *
 * This flag tells the underlying capture driver to drop the packets that were sent by itself.
 * This is useful when building applications like bridges, that should ignore the traffic
 * they just sent.
 */
#define PCAP_OPENFLAG_NOCAPTURE_LOCAL	8

/*
 * \brief This flag configures the adapter for maximum responsiveness.
 *
 * In presence of a large value for nbytes, WinPcap waits for the arrival of several packets before
 * copying the data to the user. This guarantees a low number of system calls, i.e. lower processor usage,
 * i.e. better performance, which is good for applications like sniffers. If the user sets the
 * PCAP_OPENFLAG_MAX_RESPONSIVENESS flag, the capture driver will copy the packets as soon as the application
 * is ready to receive them. This is suggested for real time applications (like, for example, a bridge)
 * that need the best responsiveness.
 */
#define PCAP_OPENFLAG_MAX_RESPONSIVENESS	16

/*
 * \}
 */


/*
 * \addtogroup remote_samp_methods
 * \{
 */

/*
 *\brief No sampling has to be done on the current capture.
 *
 * In this case, no sampling algorithms are applied to the current capture.
 */
#define PCAP_SAMP_NOSAMP	0

/*
 * \brief It defines that only 1 out of N packets must be returned to the user.
 *
 * In this case, the 'value' field of the 'pcap_samp' structure indicates the
 * number of packets (minus 1) that must be discarded before one packet got accepted.
 * In other words, if 'value = 10', the first packet is returned to the caller, while
 * the following 9 are discarded.
 */
#define PCAP_SAMP_1_EVERY_N	1

/*
 * \brief It defines that we have to return 1 packet every N milliseconds.
 *
 * In this case, the 'value' field of the 'pcap_samp' structure indicates the 'waiting
 * time' in milliseconds before one packet got accepted.
 * In other words, if 'value = 10', the first packet is returned to the caller; the next
 * returned one will be the first packet that arrives when 10ms have elapsed.
 */
#define PCAP_SAMP_FIRST_AFTER_N_MS 2

/*
 * \}
 */


/*
 * \addtogroup remote_auth_methods
 * \{
 */

/*
 * \brief It defines the NULL authentication.
 *
 * This value has to be used within the 'type' member of the pcap_rmtauth structure.
 * The 'NULL' authentication has to be equal to 'zero', so that old applications
 * can just put every field of struct pcap_rmtauth to zero, and it does work.
 */
#define RPCAP_RMTAUTH_NULL 0
/*
 * \brief It defines the username/password authentication.
 *
 * With this type of authentication, the RPCAP protocol will use the username/
 * password provided to authenticate the user on the remote machine. If the
 * authentication is successful (and the user has the right to open network devices)
 * the RPCAP connection will continue; otherwise it will be dropped.
 *
 * This value has to be used within the 'type' member of the pcap_rmtauth structure.
 */
#define RPCAP_RMTAUTH_PWD 1

/*
 * \}
 */




/*
 * \brief This structure keeps the information needed to autheticate
 * the user on a remote machine.
 *
 * The remote machine can either grant or refuse the access according
 * to the information provided.
 * In case the NULL authentication is required, both 'username' and
 * 'password' can be NULL pointers.
 *
 * This structure is meaningless if the source is not a remote interface;
 * in that case, the functions which requires such a structure can accept
 * a NULL pointer as well.
 */
struct pcap_rmtauth
{
	/*
	 * \brief Type of the authentication required.
	 *
	 * In order to provide maximum flexibility, we can support different types
	 * of authentication based on the value of this 'type' variable. The currently
	 * supported authentication methods are defined into the
	 * \link remote_auth_methods Remote Authentication Methods Section\endlink.
	 */
	int type;
	/*
	 * \brief Zero-terminated string containing the username that has to be
	 * used on the remote machine for authentication.
	 *
	 * This field is meaningless in case of the RPCAP_RMTAUTH_NULL authentication
	 * and it can be NULL.
	 */
	char *username;
	/*
	 * \brief Zero-terminated string containing the password that has to be
	 * used on the remote machine for authentication.
	 *
	 * This field is meaningless in case of the RPCAP_RMTAUTH_NULL authentication
	 * and it can be NULL.
	 */
	char *password;
};


/*
 * \brief This structure defines the information related to sampling.
 *
 * In case the sampling is requested, the capturing device should read
 * only a subset of the packets coming from the source. The returned packets depend
 * on the sampling parameters.
 *
 * \warning The sampling process is applied <strong>after</strong> the filtering process.
 * In other words, packets are filtered first, then the sampling process selects a
 * subset of the 'filtered' packets and it returns them to the caller.
 */
struct pcap_samp
{
	/*
	 * Method used for sampling. Currently, the supported methods are listed in the
	 * \link remote_samp_methods Sampling Methods Section\endlink.
	 */
	int method;

	/*
	 * This value depends on the sampling method defined. For its meaning, please check
	 * at the \link remote_samp_methods Sampling Methods Section\endlink.
	 */
	int value;
};




// Maximum length of an host name (needed for the RPCAP active mode)
#define RPCAP_HOSTLIST_SIZE 1024


/*
 * \}
 */ // end of public documentation


// Exported functions



/*
 * \name New WinPcap functions
 *
 * This section lists the new functions that are able to help considerably in writing
 * WinPcap programs because of their easiness of use.
 */
// \{
PCAP_API pcap_t *pcap_open(const char *source, int snaplen, int flags, int read_timeout, struct pcap_rmtauth *auth, char *errbuf);
PCAP_API int pcap_createsrcstr(char *source, int type, const char *host, const char *port, const char *name, char *errbuf);
PCAP_API int pcap_parsesrcstr(const char *source, int *type, char *host, char *port, char *name, char *errbuf);
PCAP_API int pcap_findalldevs_ex(char *source, struct pcap_rmtauth *auth, pcap_if_t **alldevs, char *errbuf);
PCAP_API struct pcap_samp *pcap_setsampling(pcap_t *p);

// \}
// End of new WinPcap functions

/*
 * \name Remote Capture functions
 */

/*
 * Some minor differences between UN*X sockets and and Winsock sockets.
 */
#ifndef _WIN32
  /*!
   * \brief In Winsock, a socket handle is of type SOCKET; in UN*X, it's
   * a file descriptor, and therefore a signed integer.
   * We define SOCKET to be a signed integer on UN*X, so that it can
   * be used on both platforms.
   */
  #define SOCKET int

  /*!
   * \brief In Winsock, the error return if socket() fails is INVALID_SOCKET;
   * in UN*X, it's -1.
   * We define INVALID_SOCKET to be -1 on UN*X, so that it can be used on
   * both platforms.
   */
  #define INVALID_SOCKET -1
#endif

// \{
PCAP_API SOCKET pcap_remoteact_accept(const char *address, const char *port, const char *hostlist, char *connectinghost, struct pcap_rmtauth *auth, char *errbuf);
PCAP_API int pcap_remoteact_list(char *hostlist, char sep, int size, char *errbuf);
PCAP_API int pcap_remoteact_close(const char *host, char *errbuf);
PCAP_API void pcap_remoteact_cleanup();
// \}
// End of remote capture functions

#ifdef __cplusplus
}
#endif


#endif