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b3fb6a6c61
On Linux getprotobynumber() returns different results for the same argument depending on the contents of /etc/protocols at runtime (expectedly but gets in the way of reproducible test cases). On FreeBSD it returns results that are irrelevant of the contents of /etc/protocols at runtime (unexpectedly). Other implementations exist and may expose interesting properties too. And if the host uses LDAP instead of /etc/protocols for name services, a call to that function may cause LDAP handle the request. All of the above is not right for the specific task of network protocols decoding, which needs to be fast and deterministic. As the protocol number space is just 8-bit, add a 256-element array of strings/NULLs for the translation and a wrapper function around it for index range enforcement. Change the code to use the new function instead of getprotobynumber(). Fix a typo while at it.
144 lines
4.7 KiB
C
144 lines
4.7 KiB
C
/*
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* Copyright (c) 1982, 1986, 1990, 1993
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* The Regents of the University of California. 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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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From:
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* @(#)in.h 8.3 (Berkeley) 1/3/94
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* $FreeBSD: src/sys/netinet/in.h,v 1.38.2.3 1999/08/29 16:29:34 peter Exp $
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*/
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extern const struct tok ipproto_values[];
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extern const char *netdb_protoname (const nd_uint8_t);
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#ifndef IPPROTO_IP
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#define IPPROTO_IP 0 /* dummy for IP */
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#endif
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#ifndef IPPROTO_HOPOPTS
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#define IPPROTO_HOPOPTS 0 /* IPv6 hop-by-hop options */
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#endif
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#ifndef IPPROTO_ICMP
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#define IPPROTO_ICMP 1 /* control message protocol */
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#endif
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#ifndef IPPROTO_IGMP
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#define IPPROTO_IGMP 2 /* group mgmt protocol */
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#endif
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#ifndef IPPROTO_IPV4
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#define IPPROTO_IPV4 4
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#endif
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#ifndef IPPROTO_TCP
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#define IPPROTO_TCP 6 /* tcp */
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#endif
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#ifndef IPPROTO_EGP
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#define IPPROTO_EGP 8 /* exterior gateway protocol */
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#endif
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#ifndef IPPROTO_PIGP
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#define IPPROTO_PIGP 9
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#endif
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#ifndef IPPROTO_UDP
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#define IPPROTO_UDP 17 /* user datagram protocol */
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#endif
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#ifndef IPPROTO_DCCP
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#define IPPROTO_DCCP 33 /* datagram congestion control protocol */
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#endif
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#ifndef IPPROTO_IPV6
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#define IPPROTO_IPV6 41
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#endif
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#ifndef IPPROTO_ROUTING
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#define IPPROTO_ROUTING 43 /* IPv6 routing header */
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#endif
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#ifndef IPPROTO_FRAGMENT
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#define IPPROTO_FRAGMENT 44 /* IPv6 fragmentation header */
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#endif
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#ifndef IPPROTO_RSVP
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#define IPPROTO_RSVP 46 /* resource reservation */
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#endif
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#ifndef IPPROTO_GRE
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#define IPPROTO_GRE 47 /* General Routing Encap. */
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#endif
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#ifndef IPPROTO_ESP
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#define IPPROTO_ESP 50 /* SIPP Encap Sec. Payload */
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#endif
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#ifndef IPPROTO_AH
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#define IPPROTO_AH 51 /* SIPP Auth Header */
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#endif
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#ifndef IPPROTO_MOBILE
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#define IPPROTO_MOBILE 55
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#endif
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#ifndef IPPROTO_ICMPV6
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#define IPPROTO_ICMPV6 58 /* ICMPv6 */
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#endif
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#ifndef IPPROTO_NONE
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#define IPPROTO_NONE 59 /* IPv6 no next header */
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#endif
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#ifndef IPPROTO_DSTOPTS
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#define IPPROTO_DSTOPTS 60 /* IPv6 destination options */
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#endif
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#ifndef IPPROTO_MOBILITY_OLD
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/*
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* The current Protocol Numbers list says that the IP protocol number for
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* mobility headers is 135; it cites draft-ietf-mobileip-ipv6-24, but
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* that draft doesn't actually give a number.
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*
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* It appears that 62 used to be used, even though that's assigned to
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* a protocol called CFTP; however, the only reference for CFTP is a
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* Network Message from BBN back in 1982, so, for now, we support 62,
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* as well as 135, as a protocol number for mobility headers.
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*/
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#define IPPROTO_MOBILITY_OLD 62
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#endif
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#ifndef IPPROTO_ND
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#define IPPROTO_ND 77 /* Sun net disk proto (temp.) */
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#endif
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#ifndef IPPROTO_EIGRP
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#define IPPROTO_EIGRP 88 /* Cisco/GXS IGRP */
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#endif
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#ifndef IPPROTO_OSPF
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#define IPPROTO_OSPF 89
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#endif
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#ifndef IPPROTO_PIM
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#define IPPROTO_PIM 103
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#endif
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#ifndef IPPROTO_IPCOMP
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#define IPPROTO_IPCOMP 108
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#endif
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#ifndef IPPROTO_VRRP
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#define IPPROTO_VRRP 112 /* See also CARP. */
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#endif
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#ifndef IPPROTO_PGM
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#define IPPROTO_PGM 113
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#endif
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#ifndef IPPROTO_SCTP
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#define IPPROTO_SCTP 132
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#endif
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#ifndef IPPROTO_MOBILITY
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#define IPPROTO_MOBILITY 135
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#endif
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