remote-ext.h

Go to the documentation of this file.

/*
 * 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__



// 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' paramters, 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 It 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 It defines if the data trasfer (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 It defines if the remote probe has to 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
/*!
        \}
*/


/*!
        \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 lenght 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_t *pcap_open(const char *source, int snaplen, int flags, int read_timeout, struct pcap_rmtauth *auth, char *errbuf);
int pcap_createsrcstr(char *source, int type, const char *host, const char *port, const char *name, char *errbuf);
int pcap_parsesrcstr(const char *source, int *type, char *host, char *port, char *name, char *errbuf);
int pcap_findalldevs_ex(char *source, struct pcap_rmtauth *auth, pcap_if_t **alldevs, char *errbuf);
struct pcap_samp *pcap_setsampling(pcap_t *p);

//\}
// End of new winpcap functions



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

#ifdef __cplusplus
}
#endif


#endif

---