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Diffstat (limited to 'lib/lwres/include/lwres/lwpacket.h')
| -rw-r--r-- | lib/lwres/include/lwres/lwpacket.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/lib/lwres/include/lwres/lwpacket.h b/lib/lwres/include/lwres/lwpacket.h new file mode 100644 index 0000000..96f8e54 --- /dev/null +++ b/lib/lwres/include/lwres/lwpacket.h @@ -0,0 +1,159 @@ +/* + * Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: lwpacket.h,v 1.24 2007/06/19 23:47:23 tbox Exp $ */ + +#ifndef LWRES_LWPACKET_H +#define LWRES_LWPACKET_H 1 + +#include <lwres/lang.h> +#include <lwres/lwbuffer.h> +#include <lwres/result.h> + +/*% lwres_lwpacket_t */ +typedef struct lwres_lwpacket lwres_lwpacket_t; + +/*% lwres_lwpacket structure */ +struct lwres_lwpacket { + /*! The overall packet length, including the + * entire packet header. + * This field is filled in by the + * \link lwres_gabn.c lwres_gabn_*()\endlink + * and \link lwres_gnba.c lwres_gnba_*()\endlink calls. + */ + lwres_uint32_t length; + /*! Specifies the header format. Currently, + * there is only one format, #LWRES_LWPACKETVERSION_0. + * This field is filled in by the + * \link lwres_gabn.c lwres_gabn_*()\endlink + * and \link lwres_gnba.c lwres_gnba_*()\endlink calls. + */ + lwres_uint16_t version; + /*! Specifies library-defined flags for this packet, such as + * whether the packet is a request or a reply. None of + * these are definable by the caller, but library-defined values + * can be set by the caller. For example, one bit in this field + * indicates if the packet is a request or a response. + * This field is filled in by + * the application wits the exception of the + * #LWRES_LWPACKETFLAG_RESPONSE bit, which is set by the library + * in the + * \link lwres_gabn.c lwres_gabn_*()\endlink + * and \link lwres_gnba.c lwres_gnba_*()\endlink calls. + */ + lwres_uint16_t pktflags; + /*! Set by the requestor and is returned in all replies. + * If two packets from the same source have the same serial + * number and are from the same source, they are assumed to + * be duplicates and the latter ones may be dropped. + * (The library does not do this by default on replies, but + * does so on requests.) + */ + lwres_uint32_t serial; + /*! Opcodes between 0x04000000 and 0xffffffff + * are application defined. Opcodes between + * 0x00000000 and 0x03ffffff are + * reserved for library use. + * This field is filled in by the + * \link lwres_gabn.c lwres_gabn_*()\endlink + * and \link lwres_gnba.c lwres_gnba_*()\endlink calls. + */ + lwres_uint32_t opcode; + /*! Only valid for results. + * Results between 0x04000000 and 0xffffffff are application + * defined. + * Results between 0x00000000 and 0x03ffffff are reserved for + * library use. + * (This is the same reserved range defined in <isc/resultclass.h>, + * so it + * would be trivial to map ISC_R_* result codes into packet result + * codes when appropriate.) + * This field is filled in by the + * \link lwres_gabn.c lwres_gabn_*()\endlink + * and \link lwres_gnba.c lwres_gnba_*()\endlink calls. + */ + lwres_uint32_t result; + /*! Set to the maximum buffer size that the receiver can + * handle on requests, and the size of the buffer needed to + * satisfy a request + * when the buffer is too large for replies. + * This field is supplied by the application. + */ + lwres_uint32_t recvlength; + /*! The packet level auth type used. + * Authtypes between 0x1000 and 0xffff are application defined. + * Authtypes + * between 0x0000 and 0x0fff are reserved for library use. + * This is currently + * unused and MUST be set to zero. + */ + lwres_uint16_t authtype; + /*! The length of the authentication data. + * See the specific + * authtypes for more information on what is contained + * in this field. This is currently unused, and + * MUST be set to zero. + */ + lwres_uint16_t authlength; +}; + +#define LWRES_LWPACKET_LENGTH (4 * 5 + 2 * 4) /*%< Overall length. */ + +#define LWRES_LWPACKETFLAG_RESPONSE 0x0001U /*%< If set, pkt is a response. */ + + +#define LWRES_LWPACKETVERSION_0 0 /*%< Header format. */ + +/*! \file lwres/lwpacket.h + * + * + * The remainder of the packet consists of two regions, one described by + * "authlen" and one of "length - authlen - sizeof(lwres_lwpacket_t)". + * + * That is: + * + * \code + * pkt header + * authlen bytes of auth information + * data bytes + * \endcode + * + * Currently defined opcodes: + * + *\li #LWRES_OPCODE_NOOP. Success is always returned, with the packet contents echoed. + * + *\li #LWRES_OPCODE_GETADDRSBYNAME. Return all known addresses for a given name. + * This may return NIS or /etc/hosts info as well as DNS + * information. Flags will be provided to indicate ip4/ip6 + * addresses are desired. + * + *\li #LWRES_OPCODE_GETNAMEBYADDR. Return the hostname for the given address. Once + * again, it will return data from multiple sources. + */ + +LWRES_LANG_BEGINDECLS + +/* XXXMLG document */ +lwres_result_t +lwres_lwpacket_renderheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt); + +lwres_result_t +lwres_lwpacket_parseheader(lwres_buffer_t *b, lwres_lwpacket_t *pkt); + +LWRES_LANG_ENDDECLS + +#endif /* LWRES_LWPACKET_H */ |