/usr/share/vim/vim80/syntax/dnsmasq.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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" Maintainer:	Thilo Six
" Contact:	vim-foo@xk2c-foo.de
"		:3s+-foo++g
" Description:	highlight dnsmasq configuration files
" File:		runtime/syntax/dnsmasq.vim
" Version:	2.76
" Last Change:	2015 Sep 27
" Modeline:	vim: ts=8:sw=2:sts=2:
"
" License:	VIM License
"		Vim is Charityware, see ":help Uganda"
"
" Options:	You might want to add this to your vimrc:
"
"		if &background == "dark"
"		    let dnsmasq_backrgound_light = 0
"		else
"		    let dnsmasq_backrgound_light = 1
"		endif
"
" quit when a syntax file was already loaded
if exists("b:current_syntax") || &compatible
    finish
endif
let s:cpo_save = &cpo
set cpo&vim
if !exists("b:dnsmasq_backrgound_light")
    if exists("dnsmasq_backrgound_light")
	let b:dnsmasq_backrgound_light = dnsmasq_backrgound_light
    else
	let b:dnsmasq_backrgound_light = 0
    endif
endif
" case on
syn case match
syn match   DnsmasqValues   "=.*"hs=s+1 contains=DnsmasqComment,DnsmasqSpecial
syn match   DnsmasqSpecial  display '=\|@\|,\|!\|:'	  nextgroup=DnsmasqValues
syn match   DnsmasqSpecial  "#"
syn match   DnsmasqIPv4	    "\<\(\(25\_[0-5]\|2\_[0-4]\_[0-9]\|\_[01]\?\_[0-9]\_[0-9]\?\)\.\)\{3\}\(25\_[0-5]\|2\_[0-4]\_[0-9]\|\_[01]\?\_[0-9]\_[0-9]\?\)\>"	nextgroup=DnsmasqSubnet2,DnsmasqRange
syn match   DnsmasqSubnet   "\<255.\(\(25\_[0-5]\|2\_[0-4]\_[0-9]\|\_[01]\?\_[0-9]\_[0-9]\?\)\.\)\{2\}\(25\_[0-5]\|2\_[0-4]\_[0-9]\|\_[01]\?\_[0-9]\_[0-9]\?\)\>"
syn match   DnsmasqSubnet2  contained "\/\([0-4]\?[0-9]\)\>"
syn match   DnsmasqRange    contained "-"
syn match   DnsmasqMac	    "\<\(\x\x\?:\)\{5}\x\x\?"
syn match   DnsmasqTime	    "\<\(\d\{1,3}\)[hm]\>"
" String
syn match   DnsmasqString   "\".*\""  contains=@Spell
syn match   DnsmasqString   "'.*'"    contains=@Spell
" Comments
syn keyword DnsmasqTodo	    FIXME TODO XXX NOTE contained
syn match   DnsmasqComment  "\(^\|\s\+\)#.*$"   contains=@Spell,DnsmasqTodo
" highlight trailing spaces
syn match   DnsmasqTrailSpace	   "[ \t]\+$"
syn match   DnsmasqTrailSpace	   "[ \t]\+$" containedin=ALL
syn match DnsmasqKeywordSpecial    "\<set\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<tag\>:"me=e-1
syn match DnsmasqKeywordSpecial    ",\<static\>"hs=s+1	  contains=DnsmasqSpecial
syn match DnsmasqKeywordSpecial    ",\<infinite\>"hs=s+1  contains=DnsmasqSpecial
syn match DnsmasqKeywordSpecial    "\<encap\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<interface\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<vi-encap\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<net\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<vendor\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<opt\>:"me=e-1
syn match DnsmasqKeywordSpecial    "\<option\>:"me=e-1
syn match DnsmasqKeywordSpecial    ",\<ignore\>"hs=s+1	  contains=DnsmasqSpecial
syn match DnsmasqKeywordSpecial    "\<id\>:"me=e-1
syn match DnsmasqKeyword    "^\s*add-mac\>"
syn match DnsmasqKeyword    "^\s*add-subnet\>"
syn match DnsmasqKeyword    "^\s*addn-hosts\>"
syn match DnsmasqKeyword    "^\s*address\>"
syn match DnsmasqKeyword    "^\s*alias\>"
syn match DnsmasqKeyword    "^\s*all-servers\>"
syn match DnsmasqKeyword    "^\s*auth-zone\>"
syn match DnsmasqKeyword    "^\s*bind-dynamic\>"
syn match DnsmasqKeyword    "^\s*bind-interfaces\>"
syn match DnsmasqKeyword    "^\s*bogus-nxdomain\>"
syn match DnsmasqKeyword    "^\s*bogus-priv\>"
syn match DnsmasqKeyword    "^\s*bootp-dynamic\>"
syn match DnsmasqKeyword    "^\s*bridge-interface\>"
syn match DnsmasqKeyword    "^\s*cache-size\>"
syn match DnsmasqKeyword    "^\s*clear-on-reload\>"
syn match DnsmasqKeyword    "^\s*cname\>"
syn match DnsmasqKeyword    "^\s*conf-dir\>"
syn match DnsmasqKeyword    "^\s*conf-file\>"
syn match DnsmasqKeyword    "^\s*conntrack\>"
syn match DnsmasqKeyword    "^\s*dhcp-alternate-port\>"
syn match DnsmasqKeyword    "^\s*dhcp-authoritative\>"
syn match DnsmasqKeyword    "^\s*dhcp-boot\>"
syn match DnsmasqKeyword    "^\s*dhcp-broadcast\>"
syn match DnsmasqKeyword    "^\s*dhcp-circuitid\>"
syn match DnsmasqKeyword    "^\s*dhcp-client-update\>"
syn match DnsmasqKeyword    "^\s*dhcp-duid\>"
syn match DnsmasqKeyword    "^\s*dhcp-fqdn\>"
syn match DnsmasqKeyword    "^\s*dhcp-generate-names\>"
syn match DnsmasqKeyword    "^\s*dhcp-host\>"
syn match DnsmasqKeyword    "^\s*dhcp-hostsfile\>"
syn match DnsmasqKeyword    "^\s*dhcp-ignore\>"
syn match DnsmasqKeyword    "^\s*dhcp-ignore-names\>"
syn match DnsmasqKeyword    "^\s*dhcp-lease-max\>"
syn match DnsmasqKeyword    "^\s*dhcp-leasefile\>"
syn match DnsmasqKeyword    "^\s*dhcp-luascript\>"
syn match DnsmasqKeyword    "^\s*dhcp-mac\>"
syn match DnsmasqKeyword    "^\s*dhcp-match\>"
syn match DnsmasqKeyword    "^\s*dhcp-no-override\>"
syn match DnsmasqKeyword    "^\s*dhcp-option\>"
syn match DnsmasqKeyword    "^\s*dhcp-option-force\>"
syn match DnsmasqKeyword    "^\s*dhcp-optsfile\>"
syn match DnsmasqKeyword    "^\s*dhcp-proxy\>"
syn match DnsmasqKeyword    "^\s*dhcp-range\>"
syn match DnsmasqKeyword    "^\s*dhcp-relay\>"
syn match DnsmasqKeyword    "^\s*dhcp-remoteid\>"
syn match DnsmasqKeyword    "^\s*dhcp-script\>"
syn match DnsmasqKeyword    "^\s*dhcp-scriptuser\>"
syn match DnsmasqKeyword    "^\s*dhcp-sequential-ip\>"
syn match DnsmasqKeyword    "^\s*dhcp-subscrid\>"
syn match DnsmasqKeyword    "^\s*dhcp-userclass\>"
syn match DnsmasqKeyword    "^\s*dhcp-vendorclass\>"
syn match DnsmasqKeyword    "^\s*dhcp-hostsdir\>"
syn match DnsmasqKeyword    "^\s*dns-rr\>"
syn match DnsmasqKeyword    "^\s*dnssec\>"
syn match DnsmasqKeyword    "^\s*dnssec-check-unsigned\>"
syn match DnsmasqKeyword    "^\s*dnssec-no-timecheck\>"
syn match DnsmasqKeyword    "^\s*dnssec-timestamp\>"
syn match DnsmasqKeyword    "^\s*dns-forward-max\>"
syn match DnsmasqKeyword    "^\s*domain\>"
syn match DnsmasqKeyword    "^\s*domain-needed\>"
syn match DnsmasqKeyword    "^\s*edns-packet-max\>"
syn match DnsmasqKeyword    "^\s*enable-dbus\>"
syn match DnsmasqKeyword    "^\s*enable-ra\>"
syn match DnsmasqKeyword    "^\s*enable-tftp\>"
syn match DnsmasqKeyword    "^\s*except-interface\>"
syn match DnsmasqKeyword    "^\s*expand-hosts\>"
syn match DnsmasqKeyword    "^\s*filterwin2k\>"
syn match DnsmasqKeyword    "^\s*group\>"
syn match DnsmasqKeyword    "^\s*host-record\>"
syn match DnsmasqKeyword    "^\s*interface\>"
syn match DnsmasqKeyword    "^\s*interface-name\>"
syn match DnsmasqKeyword    "^\s*ipset\>"
syn match DnsmasqKeyword    "^\s*ignore-address\>"
syn match DnsmasqKeyword    "^\s*keep-in-foreground\>"
syn match DnsmasqKeyword    "^\s*leasefile-ro\>"
syn match DnsmasqKeyword    "^\s*listen-address\>"
syn match DnsmasqKeyword    "^\s*local\>"
syn match DnsmasqKeyword    "^\s*localmx\>"
syn match DnsmasqKeyword    "^\s*local-ttl\>"
syn match DnsmasqKeyword    "^\s*local-service\>"
syn match DnsmasqKeyword    "^\s*localise-queries\>"
syn match DnsmasqKeyword    "^\s*log-async\>"
syn match DnsmasqKeyword    "^\s*log-dhcp\>"
syn match DnsmasqKeyword    "^\s*log-facility\>"
syn match DnsmasqKeyword    "^\s*log-queries\>"
syn match DnsmasqKeyword    "^\s*max-ttl\>"
syn match DnsmasqKeyword    "^\s*max-cache-ttl\>"
syn match DnsmasqKeyword    "^\s*min-cache-ttl\>"
syn match DnsmasqKeyword    "^\s*min-port\>"
syn match DnsmasqKeyword    "^\s*mx-host\>"
syn match DnsmasqKeyword    "^\s*mx-target\>"
syn match DnsmasqKeyword    "^\s*naptr-record\>"
syn match DnsmasqKeyword    "^\s*neg-ttl\>"
syn match DnsmasqKeyword    "^\s*no-daemon\>"
syn match DnsmasqKeyword    "^\s*no-dhcp-interface\>"
syn match DnsmasqKeyword    "^\s*no-hosts\>"
syn match DnsmasqKeyword    "^\s*no-negcache\>"
syn match DnsmasqKeyword    "^\s*no-ping\>"
syn match DnsmasqKeyword    "^\s*no-poll\>"
syn match DnsmasqKeyword    "^\s*no-resolv\>"
syn match DnsmasqKeyword    "^\s*pid-file\>"
syn match DnsmasqKeyword    "^\s*port\>"
syn match DnsmasqKeyword    "^\s*proxy-dnssec\>"
syn match DnsmasqKeyword    "^\s*ptr-record\>"
syn match DnsmasqKeyword    "^\s*pxe-prompt\>"
syn match DnsmasqKeyword    "^\s*pxe-service\>"
syn match DnsmasqKeyword    "^\s*query-port\>"
syn match DnsmasqKeyword    "^\s*quiet-ra\>"
syn match DnsmasqKeyword    "^\s*quiet-dhcp\>"
syn match DnsmasqKeyword    "^\s*quiet-dhcp6\>"
syn match DnsmasqKeyword    "^\s*ra-param\>"
syn match DnsmasqKeyword    "^\s*read-ethers\>"
syn match DnsmasqKeyword    "^\s*rebind-domain-ok\>"
syn match DnsmasqKeyword    "^\s*rebind-localhost-ok\>"
syn match DnsmasqKeyword    "^\s*resolv-file\>"
syn match DnsmasqKeyword    "^\s*rev-server\>"
syn match DnsmasqKeyword    "^\s*selfmx\>"
syn match DnsmasqKeyword    "^\s*server\>"
syn match DnsmasqKeyword    "^\s*servers-file\>"
syn match DnsmasqKeyword    "^\s*srv-host\>"
syn match DnsmasqKeyword    "^\s*stop-dns-rebind\>"
syn match DnsmasqKeyword    "^\s*strict-order\>"
syn match DnsmasqKeyword    "^\s*synth-domain\>"
syn match DnsmasqKeyword    "^\s*tag-if\>"
syn match DnsmasqKeyword    "^\s*test\>"
syn match DnsmasqKeyword    "^\s*tftp-max\>"
syn match DnsmasqKeyword    "^\s*tftp-lowercase\>"
syn match DnsmasqKeyword    "^\s*tftp-no-blocksize\>"
syn match DnsmasqKeyword    "^\s*tftp-no-fail\>"
syn match DnsmasqKeyword    "^\s*tftp-port-range\>"
syn match DnsmasqKeyword    "^\s*tftp-root\>"
syn match DnsmasqKeyword    "^\s*tftp-secure\>"
syn match DnsmasqKeyword    "^\s*tftp-unique-root\>"
syn match DnsmasqKeyword    "^\s*txt-record\>"
syn match DnsmasqKeyword    "^\s*user\>"
syn match DnsmasqKeyword    "^\s*version\>"
if b:dnsmasq_backrgound_light == 1
    hi def DnsmasqKeyword	ctermfg=DarkGreen guifg=DarkGreen
else
    hi def link DnsmasqKeyword  Keyword
endif
hi def link DnsmasqKeywordSpecial Type
hi def link DnsmasqTodo		Todo
hi def link DnsmasqSpecial	Constant
hi def link DnsmasqIPv4		Identifier
hi def link DnsmasqSubnet2	DnsmasqSubnet
hi def link DnsmasqSubnet	DnsmasqMac
hi def link DnsmasqRange	DnsmasqMac
hi def link DnsmasqMac		Preproc
hi def link DnsmasqTime		Preproc
hi def link DnsmasqComment	Comment
hi def link DnsmasqTrailSpace	DiffDelete
hi def link DnsmasqString	Constant
hi def link DnsmasqValues	Normal
let b:current_syntax = "dnsmasq"
let &cpo = s:cpo_save
unlet s:cpo_save
 |