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Support for FreeDNS

pull/557/head
David Kerr 8 years ago
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  1. 394
      dnsapi/dns_freedns.sh

394
dnsapi/dns_freedns.sh
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#!/usr/bin/env sh
#This file name is "dns_freedns.sh"
#So, here must be a method dns_freedns_add()
#Which will be called by acme.sh to add the txt record to your api system.
#returns 0 means success, otherwise error.
#
#Author: David Kerr
#Report Bugs here: https://github.com/Neilpang/acme.sh
#
######## Public functions #####################
# Requires FreeDNS userid and password in folowing variables...
# FREEDNS_USER=username
# FREEDNS_PASSWORD=password
#Usage: dns_freedns_add _acme-challenge.www.domain.com "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
dns_freedns_add() {
fulldomain=$1
txtvalue=$2
_info "Add TXT record using FreeDNS"
_debug "fulldomain: $fulldomain"
_debug "txtvalue: $txtvalue"
if [ -z "$FREEDNS_USER" ] || [ -z "$FREEDNS_PASSWORD" ]; then
AD_API_KEY=""
_err "You didn't specify the FreeDNS username and password yet."
_err "Please export as FREEDNS_USER / FREEDNS_PASSWORD and try again."
return 1
fi
login_cookies="$(_freedns_login $FREEDNS_USER $FREEDNS_PASSWORD)"
if [ -z "$login_cookies" ]; then
return 1
fi
_saveaccountconf FREEDNS_USER "$FREEDNS_USER"
_saveaccountconf FREEDNS_PASSWORD "$FREEDNS_PASSWORD"
htmlpage="$(_freedns_retrieve_subdomain_page $login_cookies)"
if [ $? != 0 ]; then
return $?
fi
# split our full domain name into two parts...
top_domain="$(echo $fulldomain | rev | cut -d. -f -2 | rev)"
sub_domain="$(echo $fulldomain | rev | cut -d. -f 3- | rev)"
# Now convert the tables in the HTML to CSV. This litte gem from
# http://stackoverflow.com/questions/1403087/how-can-i-convert-an-html-table-to-csv
subdomain_csv="$(echo $htmlpage |
grep -i -e '</\?TABLE\|</\?TD\|</\?TR\|</\?TH' |
sed 's/^[\ \t]*//g' |
tr -d '\n' |
sed 's/<\/TR[^>]*>/\n/Ig' |
sed 's/<\/\?\(TABLE\|TR\)[^>]*>//Ig' |
sed 's/^<T[DH][^>]*>\|<\/\?T[DH][^>]*>$//Ig' |
sed 's/<\/T[DH][^>]*><T[DH][^>]*>/,/Ig' |
grep 'edit.php?' |
grep $top_domain)"
# The above beauty ends with striping out rows that do not have an
# href to edit.php and do not have the top domain we are looking for.
# So all we should be left with is CSV of table of subdomains we are
# interested in.
# Now we have to read through this table and extract the data we need
IFS=$'\n'
found=0
for line in $subdomain_csv
do
tmp="$(echo $line | cut -d ',' -f 1)"
if [ $found = 0 ] && _startswith "$tmp" "<td>$top_domain"; then
# this line will contain DNSdomainid for the top_domain
tmp="$(echo $line | cut -d ',' -f 2)"
url=${tmp#*=}
url=${url%%>*}
DNSdomainid=${url#*domain_id=}
found=1
else
# lines contain DNS records for all subdomains
dns_href="$(echo $line | cut -d ',' -f 2)"
tmp=${dns_href#*>}
DNSname=${tmp%%<*}
DNStype="$(echo $line | cut -d ',' -f 3)"
if [ "$DNSname" = "$fulldomain" -a "$DNStype" = "TXT" ]; then
tmp=${dns_href#*=}
url=${tmp%%>*}
DNSdataid=${url#*data_id=}
# Now get current value for the TXT record. This method may
# produce inaccurate results as the value field is truncated
# on this webpage. To get full value we would need to load
# another page. However we don't really need this so long as
# there is only one TXT record for the acme chalenge subdomain.
tmp="$(echo $line | cut -d ',' -f 4)"
# strip the html double-quotes off the value
tmp=${tmp#&quot;}
DNSvalue=${tmp%&quot;}
if [ $found != 0 ]; then
break
# we are breaking out of the loop at the first match of DNS name
# and DNS type (if we are past finding the domainid). This assumes
# that there is only ever one TXT record for the LetsEncrypt/acme
# challenge subdomain. This seems to be a reasonable assumption
# as the acme client deletes the TXT record on successful validation.
fi
else
DNSname=""
DNStype=""
fi
fi
done
unset IFS
_debug "DNSname: $DNSname DNStype: $DNStype DNSdomainid: $DNSdomainid DNSdataid: $DNSdataid"
_debug "DNSvalue: $DNSvalue"
if [ -z "$DNSdomainid" ]; then
# If domain ID is empty then something went wrong (top level
# domain not found at FreeDNS). Cannot proceed.
_debug2 "$htmlpage"
_debug2 "$subdomain_csv"
_err "Domain $top_domain not found at FreeDNS"
return 1
fi
if [ -z "$DNSdataid" ]; then
# If data ID is empty then specific subdomain does not exist yet, need
# to create it this should always be the case as the acme client
# deletes the entry after domain is validated.
_freedns_add_txt_record $login_cookies $DNSdomainid $sub_domain "$txtvalue"
return $?
else
if [ "$txtvalue" = "$DNSvalue" ]; then
# if value in TXT record matches value requested then DNS record
# does not need to be updated. But...
# Testing value match fails. Website is truncating the value field.
# So for now we will always go down the else path. Though in theory
# should never come here anyway as the acme client deletes
# the TXT record on successful validation, so we should not even
# have found a TXT record !!
_info "No update necessary for $fulldomain at FreeDNS"
return 0
else
# Delete the old TXT record (with the wrong value)
_freedns_delete_txt_record $login_cookies $DNSdataid
if [ $? = 0 ]; then
# And add in new TXT record with the value provided
_freedns_add_txt_record $login_cookies $DNSdomainid $sub_domain "$txtvalue"
fi
return $?
fi
fi
return 0
}
#Usage: fulldomain txtvalue
#Remove the txt record after validation.
dns_freedns_rm() {
fulldomain=$1
txtvalue=$2
_info "Delete TXT record using FreeDNS"
_debug "fulldomain: $fulldomain"
_debug "txtvalue: $txtvalue"
login_cookies="$(_freedns_login $FREEDNS_USER $FREEDNS_PASSWORD)"
if [ -z "$login_cookies" ]; then
return 1
fi
htmlpage="$(_freedns_retrieve_subdomain_page $login_cookies)"
if [ $? != 0 ]; then
return $?
fi
# Now convert the tables in the HTML to CSV. This litte gem from
# http://stackoverflow.com/questions/1403087/how-can-i-convert-an-html-table-to-csv
subdomain_csv="$(echo $htmlpage |
grep -i -e '</\?TABLE\|</\?TD\|</\?TR\|</\?TH' |
sed 's/^[\ \t]*//g' |
tr -d '\n' |
sed 's/<\/TR[^>]*>/\n/Ig' |
sed 's/<\/\?\(TABLE\|TR\)[^>]*>//Ig' |
sed 's/^<T[DH][^>]*>\|<\/\?T[DH][^>]*>$//Ig' |
sed 's/<\/T[DH][^>]*><T[DH][^>]*>/,/Ig' |
grep 'edit.php?' |
grep $fulldomain)"
# The above beauty ends with striping out rows that do not have an
# href to edit.php and do not have the domain name we are looking for.
# So all we should be left with is CSV of table of subdomains we are
# interested in.
# Now we have to read through this table and extract the data we need
IFS=$'\n'
for line in $subdomain_csv
do
dns_href="$(echo $line | cut -d ',' -f 2)"
tmp=${dns_href#*>}
DNSname=${tmp%%<*}
DNStype="$(echo $line | cut -d ',' -f 3)"
if [ "$DNSname" = "$fulldomain" -a "$DNStype" = "TXT" ]; then
tmp=${dns_href#*=}
url=${tmp%%>*}
DNSdataid=${url#*data_id=}
tmp="$(echo $line | cut -d ',' -f 4)"
# strip the html double-quotes off the value
tmp=${tmp#&quot;}
DNSvalue=${tmp%&quot;}
_debug "DNSvalue: $DNSvalue"
# if [ "$DNSvalue" = "$txtvalue" ]; then
# Testing value match fails. Website is truncating the value
# field. So for now we will assume that there is only one TXT
# field for the sub domain and just delete it. Currently this
# is a safe assumption.
_freedns_delete_txt_record $login_cookies $DNSdataid
unset IFS
return $?
# fi
fi
done
unset IFS
# If we get this far we did not find a match.
# Not necessarily an error, but log anyway.
_debug2 "$subdomain_csv"
_info "Cannot delete TXT record for $fulldomain/$txtvalue. Does not exist at FreeDNS"
return 0
}
#################### Private functions below ##################################
# usage: _freedns_login username password
# echos string "cookie:value;cookie:value" etc
# returns 0 success
_freedns_login() {
username=$1
password=$2
url="https://freedns.afraid.org/zc.php?step=2"
_debug "Login to FreeDNS as user $username"
# Not using acme.sh _post() function because I need to capture the cookies.
cookie_file="$(curl --silent \
--user-agent "$USER_AGENT" \
--data "username=$(_freedns_urlencode "$username")&password=$(_freedns_urlencode "$password")&submit=Login&action=auth" \
--cookie-jar - \
$url )"
if [ $? != 0 ]; then
_err "FreeDNS login failed for user $username bad RC from cURL: $?"
return $?
fi
# convert from cookie file format to cookie string
cookies=""
found=0
IFS=$'\n'
for line in $cookie_file
do
# strip spaces from start and end of line
line="$(echo "$line" | xargs)"
if [ $found = 0 ]; then
# first line, validate that it is a cookie file
if _contains "$line" "Netscape HTTP Cookie File"; then
found=1
else
_debug2 "$cookie_file"
_err "FreeDNS login failed for user $username bad cookie file"
unset IFS
return 1
fi
else
# after first line skip blank line or comments
if [ -n "$line" -a "$(echo $line | cut -c 1)" != "#" ]; then
if [ -n "$cookies" ]; then
cookies="$cookies;"
fi
cookies="$cookies$(echo $line | cut -d ' ' -f 6)=$(echo $line | cut -d ' ' -f 7)"
fi
fi
done
unset IFS
# if cookies is not empty then logon successful
if [ -z "$cookies" ]; then
_err "FreeDNS login failed for user $username"
return 1
fi
_debug "FreeDNS login cookies: $cookies"
echo "$cookies"
return 0
}
# usage _freedns_retrieve_subdomain_page login_cookies
# echo page retrieved (html)
# returns 0 success
_freedns_retrieve_subdomain_page() {
cookies=$1
url="https://freedns.afraid.org/subdomain/"
_debug "Retrieve subdmoain page from FreeDNS"
# Not using acme.sh _get() function becuase I need to pass in the cookies.
htmlpage="$(curl --silent \
--user-agent "$USER_AGENT" \
--cookie "$cookies" \
$url )"
if [ $? != 0 ]; then
_err "FreeDNS retrieve subdomins failed bad RC from cURL: $?"
return $?
fi
if [ -z "$htmlpage" ]; then
_err "FreeDNS returned empty subdomain page"
return 1
fi
_debug2 "$htmlpage"
echo "$htmlpage"
return 0
}
_freedns_add_txt_record() {
cookies=$1
domain_id=$2
subdomain=$3
value="$(_freedns_urlencode "$4")"
url="http://freedns.afraid.org/subdomain/save.php?step=2"
# Not using acme.sh _get() function becuase I need to pass in the cookies.
htmlpage="$(curl --silent \
--user-agent "$USER_AGENT" \
--cookie "$cookies" \
--data "type=TXT&domain_id=$domain_id&subdomain=$subdomain&address=%22$value%22&send=Save%21" \
$url )"
if [ $? != 0 ]; then
_err "FreeDNS failed to add TXT record for $subdomain bad RC from cURL: $?"
return $?
fi
# returned page should be empty on success
if [ -n "$htmlpage" ]; then
_debug2 "$htmlpage"
_err "FreeDNS failed to add TXT record for $subdomain"
return 1
fi
_info "Added acme challenge TXT record for $fulldomain at FreeDNS"
return 0
}
_freedns_delete_txt_record() {
cookies=$1
data_id=$2
url="https://freedns.afraid.org/subdomain/delete2.php"
# Not using acme.sh _get() function becuase I need to pass in the cookies.
htmlpage="$(curl --silent \
--user-agent "$USER_AGENT" \
--cookie "$cookies" \
"$url?data_id%5B%5D=$data_id&submit=delete+selected" )"
if [ $? != 0 ]; then
_err "FreeDNS failed to delete TXT record for $subdomain bad RC from cURL: $?"
return $?
fi
# returned page should be empty on success
if [ -n "$htmlpage" ]; then
_debug2 "$htmlpage"
_err "FreeDNS failed to delete TXT record $data_id"
return 1
fi
_info "Deleted acme challenge TXT record for $fulldomain at FreeDNS"
return 0
}
# urlencode magic from...
# http://askubuntu.com/questions/53770/how-can-i-encode-and-decode-percent-encoded-strings-on-the-command-line
# The _urlencode function in acme.sh does not work !
_freedns_urlencode() {
# urlencode <string>
length="${#1}"
for (( i = 0; i < length; i++ )); do
c="${1:i:1}"
case $c in
[a-zA-Z0-9.~_-]) printf "$c" ;;
*) printf '%%%02X' "'$c"
esac
done
}
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