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acme.sh/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/dkerr64/acme.sh
#
######## Public functions #####################
# Export FreeDNS userid and password in following variables...
# FREEDNS_User=username
# FREEDNS_Password=password
# login cookie is saved in acme account config file so userid / pw
# need to be set only when changed.
#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 "$FREEDNS_Password" ]; then
FREEDNS_User=""
FREEDNS_Password=""
if [ -z "$FREEDNS_COOKIE" ]; then
_err "You did not specify the FreeDNS username and password yet."
_err "Please export as FREEDNS_User / FREEDNS_Password and try again."
return 1
fi
using_cached_cookies="true"
else
FREEDNS_COOKIE="$(_freedns_login "$FREEDNS_User" "$FREEDNS_Password")"
if [ -z "$FREEDNS_COOKIE" ]; then
return 1
fi
using_cached_cookies="false"
fi
_debug "FreeDNS login cookies: $FREEDNS_COOKIE (cached = $using_cached_cookies)"
_saveaccountconf FREEDNS_COOKIE "$FREEDNS_COOKIE"
# split our full domain name into two parts...
i="$(echo "$fulldomain" | tr '.' ' ' | wc -w)"
i="$(_math "$i" - 1)"
top_domain="$(echo "$fulldomain" | cut -d. -f "$i"-100)"
i="$(_math "$i" - 1)"
sub_domain="$(echo "$fulldomain" | cut -d. -f -"$i")"
# Sometimes FreeDNS does not return the subdomain page but rather
# returns a page regarding becoming a premium member. This usually
# happens after a period of inactivity. Immediately trying again
# returns the correct subdomain page. So, we will try twice to
# load the page and obtain our domain ID
attempts=2
while [ "$attempts" -gt "0" ]; do
attempts="$(_math "$attempts" - 1)"
htmlpage="$(_freedns_retrieve_subdomain_page "$FREEDNS_COOKIE")"
if [ "$?" != "0" ]; then
if [ "$using_cached_cookies" = "true" ]; then
_err "Has your FreeDNS username and password changed? If so..."
_err "Please export as FREEDNS_User / FREEDNS_Password and try again."
fi
return 1
fi
# Now convert the tables in the HTML to CSV. This litte gem from
# http://stackoverflow.com/questions/1403087/how-can-i-convert-an-html-table-to-csv
subdomain_csv="$(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][^>]*>$//Ig' \
| sed 's/<\/T[DH][^>]*><T[DH][^>]*>/,/Ig' \
| grep 'edit.php?' \
| grep "$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
lines="$(echo "$subdomain_csv" | wc -l)"
nl='
'
i=0
found=0
while [ "$i" -lt "$lines" ]; do
i="$(_math "$i" + 1)"
line="$(echo "$subdomain_csv" | cut -d "$nl" -f "$i")"
tmp="$(echo "$line" | cut -d ',' -f 1)"
if [ $found = 0 ] && _startswith "$tmp" "<td>$top_domain"; then
# this line will contain DNSdomainid for the top_domain
DNSdomainid="$(echo "$line" | cut -d ',' -f 2 | sed 's/^.*domain_id=//;s/>.*//')"
found=1
else
# lines contain DNS records for all subdomains
DNSname="$(echo "$line" | cut -d ',' -f 2 | sed 's/^[^>]*>//;s/<\/a>.*//')"
DNStype="$(echo "$line" | cut -d ',' -f 3)"
if [ "$DNSname" = "$fulldomain" ] && [ "$DNStype" = "TXT" ]; then
DNSdataid="$(echo "$line" | cut -d ',' -f 2 | sed 's/^.*data_id=//;s/>.*//')"
# Now get current value for the TXT record. This method may
# not produce accurate 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 challenge subdomain.
DNSvalue="$(echo "$line" | cut -d ',' -f 4 | sed 's/^[^&quot;]*&quot;//;s/&quot;.*//;s/<\/td>.*//')"
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
_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).
if [ "$attempts" = "0" ]; then
# exhausted maximum retry attempts
_debug "$htmlpage"
_debug "$subdomain_csv"
_err "Domain $top_domain not found at FreeDNS"
return 1
fi
else
# break out of the 'retry' loop... we have found our domain ID
break
fi
_info "Domain $top_domain not found at FreeDNS"
_info "Retry loading subdomain page ($attempts attempts remaining)"
done
if [ -z "$DNSdataid" ]; then
# If data ID is empty then specific subdomain does not exist yet, need
# to create it this should always be the case as the acme client
# deletes the entry after domain is validated.
_freedns_add_txt_record "$FREEDNS_COOKIE" "$DNSdomainid" "$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 $fulldomain at FreeDNS"
return 0
else
# Delete the old TXT record (with the wrong value)
_freedns_delete_txt_record "$FREEDNS_COOKIE" "$DNSdataid"
if [ "$?" = "0" ]; then
# And add in new TXT record with the value provided
_freedns_add_txt_record "$FREEDNS_COOKIE" "$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: $txtvalue"
# Need to read cookie from conf file again in case new value set
# during login to FreeDNS when TXT record was created.
# acme.sh does not have a _readaccountconf() function
FREEDNS_COOKIE="$(_read_conf "$ACCOUNT_CONF_PATH" "FREEDNS_COOKIE")"
_debug "FreeDNS login cookies: $FREEDNS_COOKIE"
# Sometimes FreeDNS does not return the subdomain page but rather
# returns a page regarding becoming a premium member. This usually
# happens after a period of inactivity. Immediately trying again
# returns the correct subdomain page. So, we will try twice to
# load the page and obtain our TXT record.
attempts=2
while [ "$attempts" -gt "0" ]; do
attempts="$(_math "$attempts" - 1)"
htmlpage="$(_freedns_retrieve_subdomain_page "$FREEDNS_COOKIE")"
if [ "$?" != "0" ]; then
return 1
fi
# Now convert the tables in the HTML to CSV. This litte gem from
# http://stackoverflow.com/questions/1403087/how-can-i-convert-an-html-table-to-csv
subdomain_csv="$(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
lines="$(echo "$subdomain_csv" | wc -l)"
nl='
'
i=0
found=0
while [ "$i" -lt "$lines" ]; do
i="$(_math "$i" + 1)"
line="$(echo "$subdomain_csv" | cut -d "$nl" -f "$i")"
DNSname="$(echo "$line" | cut -d ',' -f 2 | sed 's/^[^>]*>//;s/<\/a>.*//')"
DNStype="$(echo "$line" | cut -d ',' -f 3)"
if [ "$DNSname" = "$fulldomain" ] && [ "$DNStype" = "TXT" ]; then
DNSdataid="$(echo "$line" | cut -d ',' -f 2 | sed 's/^.*data_id=//;s/>.*//')"
DNSvalue="$(echo "$line" | cut -d ',' -f 4 | sed 's/^[^&quot;]*&quot;//;s/&quot;.*//;s/<\/td>.*//')"
_debug "DNSvalue: $DNSvalue"
# if [ "$DNSvalue" = "$txtvalue" ]; then
# Testing value match fails. Website is truncating the value
# field. So for now we will assume that there is only one TXT
# field for the sub domain and just delete it. Currently this
# is a safe assumption.
_freedns_delete_txt_record "$FREEDNS_COOKIE" "$DNSdataid"
return $?
# fi
fi
done
done
# If we get this far we did not find a match (after two attempts)
# Not necessarily an error, but log anyway.
_debug2 "$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
# print string "cookie=value" etc.
# returns 0 success
_freedns_login() {
export _H1="Accept-Language:en-US"
username="$1"
password="$2"
url="https://freedns.afraid.org/zc.php?step=2"
_debug "Login to FreeDNS as user $username"
htmlpage="$(_post "username=$(printf '%s' "$username" | _url_encode)&password=$(printf '%s' "$password" | _url_encode)&submit=Login&action=auth" "$url")"
if [ "$?" != "0" ]; then
_err "FreeDNS login failed for user $username bad RC from _post"
return 1
fi
cookies="$(grep -i '^Set-Cookie.*dns_cookie.*$' "$HTTP_HEADER" | _head_n 1 | tr -d "\r\n" | cut -d " " -f 2)"
# if cookies is not empty then logon successful
if [ -z "$cookies" ]; then
_debug "$htmlpage"
_err "FreeDNS login failed for user $username. Check $HTTP_HEADER file"
return 1
fi
printf "%s" "$cookies"
return 0
}
# usage _freedns_retrieve_subdomain_page login_cookies
# echo page retrieved (html)
# returns 0 success
_freedns_retrieve_subdomain_page() {
export _H1="Cookie:$1"
export _H2="Accept-Language:en-US"
url="https://freedns.afraid.org/subdomain/"
_debug "Retrieve subdomain page from FreeDNS"
htmlpage="$(_get "$url")"
if [ "$?" != "0" ]; then
_err "FreeDNS retrieve subdomains failed bad RC from _get"
return 1
elif [ -z "$htmlpage" ]; then
_err "FreeDNS returned empty subdomain page"
return 1
fi
_debug2 "$htmlpage"
printf "%s" "$htmlpage"
return 0
}
# usage _freedns_add_txt_record login_cookies domain_id subdomain value
# returns 0 success
_freedns_add_txt_record() {
export _H1="Cookie:$1"
export _H2="Accept-Language:en-US"
domain_id="$2"
subdomain="$3"
value="$(printf '%s' "$4" | _url_encode)"
url="http://freedns.afraid.org/subdomain/save.php?step=2"
htmlpage="$(_post "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 $subdomain bad RC from _post"
return 1
elif ! grep "200 OK" "$HTTP_HEADER" >/dev/null; then
_debug "$htmlpage"
_err "FreeDNS failed to add TXT record for $subdomain. Check $HTTP_HEADER file"
return 1
elif _contains "$htmlpage" "security code was incorrect"; then
_debug "$htmlpage"
_err "FreeDNS failed to add TXT record for $subdomain as FreeDNS requested security code"
_err "Note that you cannot use automatic DNS validation for FreeDNS public domains"
return 1
fi
_debug2 "$htmlpage"
_info "Added acme challenge TXT record for $fulldomain at FreeDNS"
return 0
}
# usage _freedns_delete_txt_record login_cookies data_id
# returns 0 success
_freedns_delete_txt_record() {
export _H1="Cookie:$1"
export _H2="Accept-Language:en-US"
data_id="$2"
url="https://freedns.afraid.org/subdomain/delete2.php"
htmlheader="$(_get "$url?data_id%5B%5D=$data_id&submit=delete+selected" "onlyheader")"
if [ "$?" != "0" ]; then
_err "FreeDNS failed to delete TXT record for $data_id bad RC from _get"
return 1
elif ! _contains "$htmlheader" "200 OK"; then
_debug "$htmlheader"
_err "FreeDNS failed to delete TXT record $data_id"
return 1
fi
_info "Deleted acme challenge TXT record for $fulldomain at FreeDNS"
return 0
}
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