Mdns » Historial » Versió 1
Pau Escrich, 24-10-2013 15:13
1 | 1 | Pau Escrich | h1. Mdns |
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3 | This is an example of bmx6 SMS plugin utilization. It is a distributed DNS system where every node publish the domains it is managing. |
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4 | The current implementation is done for working in OpenWRT with the Dnsmasq daemon. |
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5 | |||
6 | Usage: |
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7 | |||
8 | * /etc/init.d/mdns start |
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9 | * /etc/init.d/mdns start |
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10 | * /etc/init.d/mdns reload |
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11 | |||
12 | Files: |
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13 | |||
14 | * /etc/mdns/public contains the list of domains we wanto to announce in the network |
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15 | * /etc/mdns/hosts contains a list of "IP -> domain" which have been obtained from the network (dnsmasq looks on it) |
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16 | |||
17 | <code> |
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18 | #!/bin/sh |
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19 | # Copyright (C) 2013 Pau Escrich <p4u@dabax.net> |
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20 | # |
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21 | # This program is free software; you can redistribute it and/or modify |
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22 | # it under the terms of the GNU General Public License as published by |
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23 | # the Free Software Foundation; either version 2 of the License, or |
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24 | # (at your option) any later version. |
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25 | # |
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26 | # This program is distributed in the hope that it will be useful, |
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27 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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28 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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29 | # GNU General Public License for more details. |
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30 | # |
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31 | # You should have received a copy of the GNU General Public License along |
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32 | # with this program; if not, write to the Free Software Foundation, Inc., |
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33 | # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
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34 | # |
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35 | # The full GNU General Public License is included in this distribution in |
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36 | # the file called "COPYING". |
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37 | |||
38 | # Configuration variables |
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39 | MDNS_DIR="/etc/mdns" |
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40 | HOSTF="$MDNS_DIR/hosts" |
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41 | MY_DOMAINS="$MDNS_DIR/public" |
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42 | DOMAINS4="qmp" |
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43 | DOMAINS6="qm6" |
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44 | SMSF="/var/run/bmx6/sms/sendSms/mdns" |
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45 | SMSR="/var/run/bmx6/sms/rcvdSms" |
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46 | DNSMASQ="/etc/dnsmasq.conf" |
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47 | DNSMASQ_PID="/var/run/dnsmasq.pid" |
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48 | |||
49 | # Optional |
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50 | IPV4="" |
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51 | IPV6="" |
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52 | |||
53 | start() { |
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54 | if ! cat /etc/crontabs/root | grep mdns > /dev/null; then |
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55 | echo "/10 * * * * /etc/init.d/mdns reload > /tmp/log/mdns.log" >> /etc/crontabs/root |
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56 | /etc/init.d/cron enable |
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57 | /etc/init.d/cron start |
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58 | fi |
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59 | /etc/init.d/mdns reload |
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60 | } |
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61 | |||
62 | stop() { |
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63 | sed -i -e '/.*\/etc\/init\.d\/mdns reload > \/tmp\/log\/mdns\.log$/d' /etc/crontabs/root |
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64 | /etc/init.d/cron restart |
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65 | } |
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66 | |||
67 | reload() { |
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68 | init |
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69 | publish_my_domains |
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70 | get_domains |
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71 | finish |
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72 | } |
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73 | |||
74 | refresh() { |
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75 | reload |
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76 | } |
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77 | |||
78 | # Code |
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79 | |||
80 | error() { |
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81 | echo "ERROR: $@" |
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82 | exit 1 |
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83 | } |
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84 | |||
85 | log() { |
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86 | echo -e "-> $@" |
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87 | } |
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88 | |||
89 | init() { |
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90 | log "preparing bmx6" |
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91 | bmx6 -c --syncSms mdns |
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92 | [ $? -ne 0 ] && error "cannot configure bmx6 daemon" |
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93 | |||
94 | cat $DNSMASQ | egrep "^addn-hosts=$HOSTF" -q || { |
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95 | log "adding addn-host entry to dnsmasq config file" |
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96 | echo "addn-hosts=$HOSTF" >> $DNSMASQ |
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97 | log "restarting dnsmasq daemon" |
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98 | /etc/init.d/dnsmasq restart |
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99 | } |
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100 | ps | grep dnsmasq -q || error "dnsmasq not running" |
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101 | |||
102 | log "cleaning files" |
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103 | [ -f $SMSF ] && rm -f $SMSF |
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104 | touch $SMSF |
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105 | |||
106 | [ -f $HOSTF ] && rm -f $HOSTF |
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107 | touch $HOSTF |
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108 | |||
109 | [ ! -d $MDNS_DIR ] && mkdir -p $MDNS_DIR |
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110 | touch $MY_DOMAINS |
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111 | } |
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112 | |||
113 | check_domain() { |
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114 | local v="$1" |
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115 | local d="$2" |
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116 | local valid=1 |
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117 | local domains="" |
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118 | |||
119 | [ $v == "4" ] && domains="$DOMAINS4" |
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120 | [ $v == "6" ] && domains="$DOMAINS6" |
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121 | [ $v == "all" ] && domains="$DOMAINS4 $DOMAINS6" |
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122 | |||
123 | for D in $domains; do |
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124 | echo "$d" | egrep "\.$D"$ -q && valid=0 && break |
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125 | done |
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126 | |||
127 | return $valid |
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128 | } |
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129 | |||
130 | get_my_domains() { |
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131 | local v=${1:-4} |
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132 | local my_domains="" |
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133 | local domains="" |
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134 | local d |
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135 | |||
136 | for d in $(cat $MY_DOMAINS); do |
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137 | check_domain $v $d && my_domains="$d $my_domains" |
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138 | done |
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139 | |||
140 | [ "$v" == "4" ] && domains="$DOMAINS4" |
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141 | [ "$v" == "6" ] && domains="$DOMAINS6" |
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142 | |||
143 | for d in $domains; do |
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144 | my_domains="$(cat /proc/sys/kernel/hostname).$d $my_domains" |
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145 | done |
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146 | |||
147 | echo $my_domains |
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148 | } |
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149 | |||
150 | get_my_ip4() { |
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151 | [ -z $IPV4 ] && \ |
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152 | bmx6 -cp | grep tun4Address | awk '{print $2}' | awk -F / '{print $1}' || \ |
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153 | echo "$IPV4" |
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154 | } |
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155 | |||
156 | get_my_ip6() { |
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157 | [ -z $IPV4 ] && \ |
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158 | bmx6 -cp | grep tun6Address | awk '{print $2}' | awk -F / '{print $1}' || \ |
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159 | echo "$IPV6" |
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160 | } |
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161 | |||
162 | publish_my_domains() { |
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163 | local d domains |
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164 | |||
165 | local ip4="$(get_my_ip4)" |
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166 | local ip6="$(get_my_ip6)" |
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167 | |||
168 | [ -z "$ip4$ip6" ] && error "cannot get ip address" |
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169 | |||
170 | [ -n "$ip4" ] && { |
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171 | domains="$(get_my_domains 4)" |
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172 | log "publishing own IPv4 domains: $domains" |
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173 | echo "$ip4 $domains" >> $SMSF |
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174 | echo "$ip4 $domains" >> $HOSTF |
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175 | } |
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176 | |||
177 | [ -n "$ip6" ] && { |
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178 | domains="$(get_my_domains 6)" |
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179 | log "publishing own IPv6 domains: $domains" |
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180 | echo "$ip6 $domains" >> $SMSF |
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181 | echo "$ip6 $domains" >> $HOSTF |
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182 | } |
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183 | } |
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184 | |||
185 | get_domains() { |
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186 | local f d domline ip line n i |
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187 | |||
188 | ls $SMSR/*:mdns 2>/dev/null >/dev/null && { |
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189 | |||
190 | # for each received file |
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191 | for f in $SMSR/*:mdns; do |
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192 | n=$(cat $f | wc -l) |
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193 | |||
194 | # for each line inside the file |
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195 | for i in $(seq $n); do |
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196 | line=$(cat $f | awk "NR==$i") |
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197 | |||
198 | ip="$(echo $line | awk '{print $1}')" |
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199 | [ -z $ip ] && continue |
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200 | |||
201 | domains="" |
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202 | # for each domain (first is IP) |
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203 | for d in $(echo "$line" | awk '{$1=""; print $0}'); do |
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204 | check_domain all $d && domains="$d $domains" |
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205 | done |
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206 | |||
207 | [ -n "$domains" ] && echo "$ip $domains" >> $HOSTF |
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208 | log "added remote domains $domains= $ip" |
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209 | done |
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210 | done |
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211 | |||
212 | } || log "not published domains found in the network" |
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213 | } |
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214 | |||
215 | finish() { |
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216 | kill -SIGHUP $(cat $DNSMASQ_PID) |
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217 | } |
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218 | |||
219 | $@ |
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220 | |||
221 | </code> |