424 lines
19 KiB
C
424 lines
19 KiB
C
/*
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* Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
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* Copyright (c) 2005 - 2008 CACE Technologies, Davis (California)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Politecnico di Torino, CACE Technologies
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* nor the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef __RPCAP_PROTOCOL_H__
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#define __RPCAP_PROTOCOL_H__
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#define RPCAP_DEFAULT_NETPORT "2002" /* Default port on which the RPCAP daemon is waiting for connections. */
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/* Default port on which the client workstation is waiting for connections in case of active mode. */
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#define RPCAP_DEFAULT_NETPORT_ACTIVE "2003"
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#define RPCAP_DEFAULT_NETADDR "" /* Default network address on which the RPCAP daemon binds to. */
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/*
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* Minimum and maximum supported versions of the protocol.
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*
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* If new message types are added, the protocol version MUST be changed,
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* so that a client knows, from the negotiated protocol version, what
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* messages can be sent to the server.
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*
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* If the format of an existing message type is changed, the protocol
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* version MUST be changed, so that each side knows, from the negotiated
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* protocol version, what format should be used.
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*
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* The RPCAP_MSG_ERROR format MUST not change, as it's used to, among
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* other things, report "incorrect version number" errors, where, if
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* the format changed, the sender of the message might not know what
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* versions the recipient would understand, or might know a version
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* they support (the version number they sent) but might not know
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* the format of the message in that version.
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*
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* Other message versions SHOULD not change, as that would complicate
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* the process of interpreting the message, making it version-dependent.
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* Introducing a new message with a new format is preferable.
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*
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* Version negotiation is done as part of the authentication process:
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*
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* The client sends an authentication request, with a version number
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* of 0. All servers must accept authentication requests with a version
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* number of 0, even if they don't support version 0 for any other
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* requests.
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*
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* The server attempts to authenticate the client. If that succeeds,
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* older servers - which only support version 0 - will send an
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* authentication reply with no payload. Newer servers - which might
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* support other versions - will send an authentication reply with
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* a payload giving the minimum and maximum versions it supports.
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*
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* The client attempts to find the largest version number that is
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* in both its range of supported versions and the server's supported
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* versions. If it fails, it gives up; otherwise, it uses that version.
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*/
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#define RPCAP_MIN_VERSION 0
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#define RPCAP_MAX_VERSION 0
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/*
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* Version numbers are unsigned, so if RPCAP_MIN_VERSION is 0, they
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* are >= the minimum version, by definition; don't check against
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* RPCAP_MIN_VERSION, as you may get compiler warnings that the
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* comparison will always succeed.
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*/
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#if RPCAP_MIN_VERSION == 0
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#define RPCAP_VERSION_IS_SUPPORTED(v) \
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((v) <= RPCAP_MAX_VERSION)
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#else
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#define RPCAP_VERSION_IS_SUPPORTED(v) \
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((v) >= RPCAP_MIN_VERSION && (v) <= RPCAP_MAX_VERSION)
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#endif
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/*
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* Separators used for the host list.
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*
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* It is used:
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* - by the rpcapd daemon, when you types a list of allowed connecting hosts
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* - by the rpcap client in active mode, when the client waits for incoming
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* connections from other hosts
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*/
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#define RPCAP_HOSTLIST_SEP " ,;\n\r"
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/*********************************************************
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* *
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* Protocol messages formats *
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* *
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*********************************************************/
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/*
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* WARNING: This file defines some structures that are used to transfer
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* data on the network.
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* Note that your compiler MUST not insert padding into these structures
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* for better alignment.
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* These structures have been created in order to be correctly aligned to
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* a 32-bit boundary, but be careful in any case.
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*
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* The layout of these structures MUST not be changed. If a packet
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* format is different in different versions of the protocol, versions
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* of the structure should be provided for all the different versions or
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* version ranges (if more than one version of the protocol has the same
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* layout) that we support.
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*/
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/*
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* WARNING: These typedefs MUST be of a specific size.
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* You might have to change them on your platform.
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*
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* XXX - use the C99 types? Microsoft's newer versions of Visual Studio
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* support them.
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*/
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typedef unsigned char uint8; /* 8-bit unsigned integer */
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typedef unsigned short uint16; /* 16-bit unsigned integer */
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typedef unsigned int uint32; /* 32-bit unsigned integer */
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typedef int int32; /* 32-bit signed integer */
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/* Common header for all the RPCAP messages */
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struct rpcap_header
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{
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uint8 ver; /* RPCAP version number */
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uint8 type; /* RPCAP message type (error, findalldevs, ...) */
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uint16 value; /* Message-dependent value (not always used) */
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uint32 plen; /* Length of the payload of this RPCAP message */
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};
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/*
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* Format of data that may appear at the end of an authentication reply,
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* giving the minimum and maximum versions of the protocol that the
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* server supports.
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*
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* Older servers don't provide this; they support only version 0.
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*/
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struct rpcap_authreply
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{
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uint8 minvers; /* Minimum version supported */
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uint8 maxvers; /* Maximum version supported */
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};
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/* Format of the message for the interface description (findalldevs command) */
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struct rpcap_findalldevs_if
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{
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uint16 namelen; /* Length of the interface name */
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uint16 desclen; /* Length of the interface description */
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uint32 flags; /* Interface flags */
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uint16 naddr; /* Number of addresses */
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uint16 dummy; /* Must be zero */
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};
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/*
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* Format of an address as sent over the wire.
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*
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* Do *NOT* use struct sockaddr_storage, as the layout for that is
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* machine-dependent.
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*
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* RFC 2553 gives two sample layouts, both of which are 128 bytes long,
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* both of which are aligned on an 8-byte boundary, and both of which
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* have 2 bytes before the address data.
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*
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* However, one has a 2-byte address family value at the beginning
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* and the other has a 1-byte address length value and a 1-byte
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* address family value; this reflects the fact that the original
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* BSD sockaddr structure had a 2-byte address family value, which
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* was later changed to a 1-byte address length value and a 1-byte
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* address family value, when support for variable-length OSI
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* network-layer addresses was added.
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*
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* Furthermore, Solaris's struct sockaddr_storage is 256 bytes
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* long.
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*
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* This structure is supposed to be aligned on an 8-byte boundary;
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* the message header is 8 bytes long, so we don't have to do
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* anything to ensure it's aligned on that boundary within a packet,
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* so we just define it as 128 bytes long, with a 2-byte address
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* family. (We only support IPv4 and IPv6 addresses, which are fixed-
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* length.) That way, it's the same size as sockaddr_storage on
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* Windows, and it'll look like what an older Windows client will
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* expect.
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*
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* In addition, do *NOT* use the host's AF_ value for an address,
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* as the value for AF_INET6 is machine-dependent. We use the
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* Windows value, so it'll look like what an older Windows client
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* will expect.
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*
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* (The Windows client is the only one that has been distributed
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* as a standard part of *pcap; UN*X clients are probably built
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* from source by the user or administrator, so they're in a
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* better position to upgrade an old client. Therefore, we
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* try to make what goes over the wire look like what comes
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* from a Windows server.)
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*/
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struct rpcap_sockaddr
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{
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uint16 family; /* Address family */
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char data[128-2]; /* Data */
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};
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/*
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* Format of an IPv4 address as sent over the wire.
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*/
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#define RPCAP_AF_INET 2 /* Value on all OSes */
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struct rpcap_sockaddr_in
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{
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uint16 family; /* Address family */
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uint16 port; /* Port number */
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uint32 addr; /* IPv4 address */
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uint8 zero[8]; /* Padding */
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};
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/*
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* Format of an IPv6 address as sent over the wire.
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*/
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#define RPCAP_AF_INET6 23 /* Value on Windows */
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struct rpcap_sockaddr_in6
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{
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uint16 family; /* Address family */
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uint16 port; /* Port number */
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uint32 flowinfo; /* IPv6 flow information */
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uint8 addr[16]; /* IPv6 address */
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uint32 scope_id; /* Scope zone index */
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};
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/* Format of the message for the address listing (findalldevs command) */
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struct rpcap_findalldevs_ifaddr
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{
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struct rpcap_sockaddr addr; /* Network address */
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struct rpcap_sockaddr netmask; /* Netmask for that address */
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struct rpcap_sockaddr broadaddr; /* Broadcast address for that address */
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struct rpcap_sockaddr dstaddr; /* P2P destination address for that address */
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};
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/*
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* \brief Format of the message of the connection opening reply (open command).
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*
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* This structure transfers over the network some of the values useful on the client side.
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*/
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struct rpcap_openreply
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{
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int32 linktype; /* Link type */
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int32 tzoff; /* Timezone offset */
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};
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/* Format of the message that starts a remote capture (startcap command) */
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struct rpcap_startcapreq
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{
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uint32 snaplen; /* Length of the snapshot (number of bytes to capture for each packet) */
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uint32 read_timeout; /* Read timeout in milliseconds */
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uint16 flags; /* Flags (see RPCAP_STARTCAPREQ_FLAG_xxx) */
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uint16 portdata; /* Network port on which the client is waiting at (if 'serveropen') */
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};
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/* Format of the reply message that devoted to start a remote capture (startcap reply command) */
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struct rpcap_startcapreply
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{
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int32 bufsize; /* Size of the user buffer allocated by WinPcap; it can be different from the one we chose */
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uint16 portdata; /* Network port on which the server is waiting at (passive mode only) */
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uint16 dummy; /* Must be zero */
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};
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/*
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* \brief Format of the header which encapsulates captured packets when transmitted on the network.
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*
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* This message requires the general header as well, since we want to be able to exchange
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* more information across the network in the future (for example statistics, and kind like that).
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*/
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struct rpcap_pkthdr
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{
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uint32 timestamp_sec; /* 'struct timeval' compatible, it represents the 'tv_sec' field */
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uint32 timestamp_usec; /* 'struct timeval' compatible, it represents the 'tv_usec' field */
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uint32 caplen; /* Length of portion present in the capture */
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uint32 len; /* Real length this packet (off wire) */
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uint32 npkt; /* Ordinal number of the packet (i.e. the first one captured has '1', the second one '2', etc) */
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};
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/* General header used for the pcap_setfilter() command; keeps just the number of BPF instructions */
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struct rpcap_filter
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{
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uint16 filtertype; /* type of the filter transferred (BPF instructions, ...) */
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uint16 dummy; /* Must be zero */
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uint32 nitems; /* Number of items contained into the filter (e.g. BPF instructions for BPF filters) */
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};
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/* Structure that keeps a single BPF instuction; it is repeated 'ninsn' times according to the 'rpcap_filterbpf' header */
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struct rpcap_filterbpf_insn
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{
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uint16 code; /* opcode of the instruction */
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uint8 jt; /* relative offset to jump to in case of 'true' */
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uint8 jf; /* relative offset to jump to in case of 'false' */
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int32 k; /* instruction-dependent value */
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};
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/* Structure that keeps the data required for the authentication on the remote host */
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struct rpcap_auth
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{
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uint16 type; /* Authentication type */
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uint16 dummy; /* Must be zero */
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uint16 slen1; /* Length of the first authentication item (e.g. username) */
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uint16 slen2; /* Length of the second authentication item (e.g. password) */
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};
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/* Structure that keeps the statistics about the number of packets captured, dropped, etc. */
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struct rpcap_stats
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{
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uint32 ifrecv; /* Packets received by the kernel filter (i.e. pcap_stats.ps_recv) */
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uint32 ifdrop; /* Packets dropped by the network interface (e.g. not enough buffers) (i.e. pcap_stats.ps_ifdrop) */
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uint32 krnldrop; /* Packets dropped by the kernel filter (i.e. pcap_stats.ps_drop) */
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uint32 svrcapt; /* Packets captured by the RPCAP daemon and sent on the network */
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};
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/* Structure that is needed to set sampling parameters */
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struct rpcap_sampling
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{
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uint8 method; /* Sampling method */
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uint8 dummy1; /* Must be zero */
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uint16 dummy2; /* Must be zero */
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uint32 value; /* Parameter related to the sampling method */
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};
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/*
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* Messages field coding.
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*
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* These values are used in messages sent over the network, and MUST
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* not be changed.
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*/
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#define RPCAP_MSG_IS_REPLY 0x080 /* Flag indicating a reply */
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#define RPCAP_MSG_ERROR 1 /* Message that keeps an error notification */
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#define RPCAP_MSG_FINDALLIF_REQ 2 /* Request to list all the remote interfaces */
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#define RPCAP_MSG_OPEN_REQ 3 /* Request to open a remote device */
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#define RPCAP_MSG_STARTCAP_REQ 4 /* Request to start a capture on a remote device */
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#define RPCAP_MSG_UPDATEFILTER_REQ 5 /* Send a compiled filter into the remote device */
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#define RPCAP_MSG_CLOSE 6 /* Close the connection with the remote peer */
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#define RPCAP_MSG_PACKET 7 /* This is a 'data' message, which carries a network packet */
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#define RPCAP_MSG_AUTH_REQ 8 /* Message that keeps the authentication parameters */
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#define RPCAP_MSG_STATS_REQ 9 /* It requires to have network statistics */
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#define RPCAP_MSG_ENDCAP_REQ 10 /* Stops the current capture, keeping the device open */
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#define RPCAP_MSG_SETSAMPLING_REQ 11 /* Set sampling parameters */
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#define RPCAP_MSG_FINDALLIF_REPLY (RPCAP_MSG_FINDALLIF_REQ | RPCAP_MSG_IS_REPLY) /* Keeps the list of all the remote interfaces */
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#define RPCAP_MSG_OPEN_REPLY (RPCAP_MSG_OPEN_REQ | RPCAP_MSG_IS_REPLY) /* The remote device has been opened correctly */
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#define RPCAP_MSG_STARTCAP_REPLY (RPCAP_MSG_STARTCAP_REQ | RPCAP_MSG_IS_REPLY) /* The capture is starting correctly */
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#define RPCAP_MSG_UPDATEFILTER_REPLY (RPCAP_MSG_UPDATEFILTER_REQ | RPCAP_MSG_IS_REPLY) /* The filter has been applied correctly on the remote device */
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#define RPCAP_MSG_AUTH_REPLY (RPCAP_MSG_AUTH_REQ | RPCAP_MSG_IS_REPLY) /* Sends a message that says 'ok, authorization successful' */
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#define RPCAP_MSG_STATS_REPLY (RPCAP_MSG_STATS_REQ | RPCAP_MSG_IS_REPLY) /* Message that keeps the network statistics */
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#define RPCAP_MSG_ENDCAP_REPLY (RPCAP_MSG_ENDCAP_REQ | RPCAP_MSG_IS_REPLY) /* Confirms that the capture stopped successfully */
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#define RPCAP_MSG_SETSAMPLING_REPLY (RPCAP_MSG_SETSAMPLING_REQ | RPCAP_MSG_IS_REPLY) /* Confirms that the capture stopped successfully */
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#define RPCAP_STARTCAPREQ_FLAG_PROMISC 0x00000001 /* Enables promiscuous mode (default: disabled) */
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#define RPCAP_STARTCAPREQ_FLAG_DGRAM 0x00000002 /* Use a datagram (i.e. UDP) connection for the data stream (default: use TCP)*/
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#define RPCAP_STARTCAPREQ_FLAG_SERVEROPEN 0x00000004 /* The server has to open the data connection toward the client */
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#define RPCAP_STARTCAPREQ_FLAG_INBOUND 0x00000008 /* Capture only inbound packets (take care: the flag has no effect with promiscuous enabled) */
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#define RPCAP_STARTCAPREQ_FLAG_OUTBOUND 0x00000010 /* Capture only outbound packets (take care: the flag has no effect with promiscuous enabled) */
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#define RPCAP_UPDATEFILTER_BPF 1 /* This code tells us that the filter is encoded with the BPF/NPF syntax */
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/*
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* Network error codes.
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*
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* These values are used in messages sent over the network, and MUST
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* not be changed.
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*/
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#define PCAP_ERR_NETW 1 /* Network error */
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#define PCAP_ERR_INITTIMEOUT 2 /* The RPCAP initial timeout has expired */
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#define PCAP_ERR_AUTH 3 /* Generic authentication error */
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#define PCAP_ERR_FINDALLIF 4 /* Generic findalldevs error */
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#define PCAP_ERR_NOREMOTEIF 5 /* The findalldevs was ok, but the remote end had no interfaces to list */
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#define PCAP_ERR_OPEN 6 /* Generic pcap_open error */
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#define PCAP_ERR_UPDATEFILTER 7 /* Generic updatefilter error */
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#define PCAP_ERR_GETSTATS 8 /* Generic pcap_stats error */
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#define PCAP_ERR_READEX 9 /* Generic pcap_next_ex error */
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#define PCAP_ERR_HOSTNOAUTH 10 /* The host is not authorized to connect to this server */
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#define PCAP_ERR_REMOTEACCEPT 11 /* Generic pcap_remoteaccept error */
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#define PCAP_ERR_STARTCAPTURE 12 /* Generic pcap_startcapture error */
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#define PCAP_ERR_ENDCAPTURE 13 /* Generic pcap_endcapture error */
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#define PCAP_ERR_RUNTIMETIMEOUT 14 /* The RPCAP run-time timeout has expired */
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#define PCAP_ERR_SETSAMPLING 15 /* Error during the settings of sampling parameters */
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#define PCAP_ERR_WRONGMSG 16 /* The other end endpoint sent a message which has not been recognized */
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#define PCAP_ERR_WRONGVER 17 /* The other end endpoint has a version number that is not compatible with our */
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#define PCAP_ERR_AUTH_FAILED 18 /* The user couldn't be authenticated */
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#define PCAP_ERR_TLS_REQUIRED 19 /* The server requires TLS to connect */
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#define PCAP_ERR_AUTH_TYPE_NOTSUP 20 /* The authentication type isn't supported */
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/*
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* \brief Buffer used by socket functions to send-receive packets.
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* In case you plan to have messages larger than this value, you have to increase it.
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*/
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#define RPCAP_NETBUF_SIZE 64000
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/*********************************************************
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* *
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* Routines used by the rpcap client and rpcap daemon *
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* *
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*********************************************************/
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#include "sockutils.h"
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extern void rpcap_createhdr(struct rpcap_header *header, uint8 ver, uint8 type, uint16 value, uint32 length);
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extern const char *rpcap_msg_type_string(uint8 type);
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extern int rpcap_senderror(SOCKET sock, uint8 ver, uint16 errcode, const char *error, char *errbuf);
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#endif
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