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363 lines
13 KiB
363 lines
13 KiB
#!/usr/bin/env sh
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#This file name is "dns_freedns.sh"
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#So, here must be a method dns_freedns_add()
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#Which will be called by acme.sh to add the txt record to your api system.
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#returns 0 means success, otherwise error.
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#
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#Author: David Kerr
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#Report Bugs here: https://github.com/dkerr64/acme.sh
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#
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######## Public functions #####################
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# Export FreeDNS userid and password in following variables...
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# FREEDNS_User=username
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# FREEDNS_Password=password
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# login cookie is saved in acme account config file so userid / pw
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# need to be set only when changed.
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#Usage: dns_freedns_add _acme-challenge.www.domain.com "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
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dns_freedns_add() {
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fulldomain="$1"
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txtvalue="$2"
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_info "Add TXT record using FreeDNS"
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_debug "fulldomain: $fulldomain"
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_debug "txtvalue: $txtvalue"
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if [ -z "$FREEDNS_User" ] || [ -z "$FREEDNS_Password" ]; then
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FREEDNS_User=""
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FREEDNS_Password=""
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if [ -z "$FREEDNS_COOKIE" ]; then
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_err "You did not specify the FreeDNS username and password yet."
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_err "Please export as FREEDNS_User / FREEDNS_Password and try again."
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return 1
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fi
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using_cached_cookies="true"
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else
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FREEDNS_COOKIE="$(_freedns_login "$FREEDNS_User" "$FREEDNS_Password")"
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if [ -z "$FREEDNS_COOKIE" ]; then
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return 1
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fi
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using_cached_cookies="false"
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fi
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_debug "FreeDNS login cookies: $FREEDNS_COOKIE (cached = $using_cached_cookies)"
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_saveaccountconf FREEDNS_COOKIE "$FREEDNS_COOKIE"
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# split our full domain name into two parts...
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i="$(echo "$fulldomain" | tr '.' ' ' | wc -w)"
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i="$(_math "$i" - 1)"
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top_domain="$(echo "$fulldomain" | cut -d. -f "$i"-100)"
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i="$(_math "$i" - 1)"
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sub_domain="$(echo "$fulldomain" | cut -d. -f -"$i")"
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_debug top_domain "$top_domain"
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_debug sub_domain "$sub_domain"
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# Sometimes FreeDNS does not return the subdomain page but rather
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# returns a page regarding becoming a premium member. This usually
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# happens after a period of inactivity. Immediately trying again
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# returns the correct subdomain page. So, we will try twice to
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# load the page and obtain our domain ID
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attempts=2
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while [ "$attempts" -gt "0" ]; do
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attempts="$(_math "$attempts" - 1)"
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htmlpage="$(_freedns_retrieve_subdomain_page "$FREEDNS_COOKIE")"
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if [ "$?" != "0" ]; then
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if [ "$using_cached_cookies" = "true" ]; then
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_err "Has your FreeDNS username and password changed? If so..."
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_err "Please export as FREEDNS_User / FREEDNS_Password and try again."
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fi
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return 1
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fi
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_debug2 htmlpage "$htmlpage"
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subdomain_csv="$(echo "$htmlpage" | tr -d "\n\r" | _egrep_o '<form .*</form>' | sed 's/<tr>/@<tr>/g' | tr '@' '\n' | grep edit.php | grep "$top_domain")"
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_debug2 subdomain_csv "$subdomain_csv"
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# The above beauty ends with striping out rows that do not have an
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# href to edit.php and do not have the top domain we are looking for.
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# So all we should be left with is CSV of table of subdomains we are
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# interested in.
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# Now we have to read through this table and extract the data we need
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lines="$(echo "$subdomain_csv" | wc -l)"
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i=0
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found=0
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while [ "$i" -lt "$lines" ]; do
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i="$(_math "$i" + 1)"
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line="$(echo "$subdomain_csv" | sed -n "${i}p")"
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_debug2 line "$line"
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if [ $found = 0 ] && _contains "$line" "<td>$top_domain</td>"; then
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# this line will contain DNSdomainid for the top_domain
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DNSdomainid="$(echo "$line" | _egrep_o "edit_domain_id *= *.*>" | cut -d = -f 2 | cut -d '>' -f 1)"
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_debug2 DNSdomainid "$DNSdomainid"
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found=1
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else
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# lines contain DNS records for all subdomains
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DNSname="$(echo "$line" | _egrep_o 'edit.php.*</a>' | cut -d '>' -f 2 | cut -d '<' -f 1)"
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_debug2 DNSname "$DNSname"
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DNStype="$(echo "$line" | sed 's/<td/@<td/g' | tr '@' '\n' | sed -n '4p' | cut -d '>' -f 2 | cut -d '<' -f 1)"
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_debug2 DNStype "$DNStype"
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if [ "$DNSname" = "$fulldomain" ] && [ "$DNStype" = "TXT" ]; then
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DNSdataid="$(echo "$line" | _egrep_o 'data_id=.*' | cut -d = -f 2 | cut -d '>' -f 1)"
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# Now get current value for the TXT record. This method may
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# not produce accurate results as the value field is truncated
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# on this webpage. To get full value we would need to load
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# another page. However we don't really need this so long as
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# there is only one TXT record for the acme challenge subdomain.
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DNSvalue="$(echo "$line" | sed 's/<td/@<td/g' | tr '@' '\n' | sed -n '5p' | cut -d '>' -f 2 | cut -d '<' -f 1)"
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_debug2 DNSvalue "$DNSvalue"
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if [ $found != 0 ]; then
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break
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# we are breaking out of the loop at the first match of DNS name
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# and DNS type (if we are past finding the domainid). This assumes
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# that there is only ever one TXT record for the LetsEncrypt/acme
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# challenge subdomain. This seems to be a reasonable assumption
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# as the acme client deletes the TXT record on successful validation.
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fi
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else
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DNSname=""
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DNStype=""
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fi
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fi
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done
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_debug "DNSname: $DNSname DNStype: $DNStype DNSdomainid: $DNSdomainid DNSdataid: $DNSdataid"
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_debug "DNSvalue: $DNSvalue"
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if [ -z "$DNSdomainid" ]; then
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# If domain ID is empty then something went wrong (top level
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# domain not found at FreeDNS).
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if [ "$attempts" = "0" ]; then
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# exhausted maximum retry attempts
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_debug "$htmlpage"
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_debug "$subdomain_csv"
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_err "Domain $top_domain not found at FreeDNS"
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return 1
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fi
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else
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# break out of the 'retry' loop... we have found our domain ID
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break
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fi
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_info "Domain $top_domain not found at FreeDNS"
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_info "Retry loading subdomain page ($attempts attempts remaining)"
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done
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if [ -z "$DNSdataid" ]; then
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# If data ID is empty then specific subdomain does not exist yet, need
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# to create it this should always be the case as the acme client
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# deletes the entry after domain is validated.
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_freedns_add_txt_record "$FREEDNS_COOKIE" "$DNSdomainid" "$sub_domain" "$txtvalue"
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return $?
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else
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if [ "$txtvalue" = "$DNSvalue" ]; then
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# if value in TXT record matches value requested then DNS record
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# does not need to be updated. But...
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# Testing value match fails. Website is truncating the value field.
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# So for now we will always go down the else path. Though in theory
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# should never come here anyway as the acme client deletes
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# the TXT record on successful validation, so we should not even
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# have found a TXT record !!
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_info "No update necessary for $fulldomain at FreeDNS"
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return 0
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else
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# Delete the old TXT record (with the wrong value)
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if _freedns_delete_txt_record "$FREEDNS_COOKIE" "$DNSdataid"; then
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# And add in new TXT record with the value provided
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_freedns_add_txt_record "$FREEDNS_COOKIE" "$DNSdomainid" "$sub_domain" "$txtvalue"
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fi
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return $?
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fi
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fi
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return 0
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}
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#Usage: fulldomain txtvalue
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#Remove the txt record after validation.
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dns_freedns_rm() {
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fulldomain="$1"
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txtvalue="$2"
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_info "Delete TXT record using FreeDNS"
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_debug "fulldomain: $fulldomain"
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_debug "txtvalue: $txtvalue"
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# Need to read cookie from conf file again in case new value set
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# during login to FreeDNS when TXT record was created.
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# acme.sh does not have a _readaccountconf() function
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FREEDNS_COOKIE="$(_read_conf "$ACCOUNT_CONF_PATH" "FREEDNS_COOKIE")"
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_debug "FreeDNS login cookies: $FREEDNS_COOKIE"
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# Sometimes FreeDNS does not return the subdomain page but rather
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# returns a page regarding becoming a premium member. This usually
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# happens after a period of inactivity. Immediately trying again
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# returns the correct subdomain page. So, we will try twice to
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# load the page and obtain our TXT record.
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attempts=2
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while [ "$attempts" -gt "0" ]; do
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attempts="$(_math "$attempts" - 1)"
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htmlpage="$(_freedns_retrieve_subdomain_page "$FREEDNS_COOKIE")"
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if [ "$?" != "0" ]; then
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return 1
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fi
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subdomain_csv="$(echo "$htmlpage" | tr -d "\n\r" | _egrep_o '<form .*</form>' | sed 's/<tr>/@<tr>/g' | tr '@' '\n' | grep edit.php | grep "$fulldomain")"
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_debug2 subdomain_csv "$subdomain_csv"
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# The above beauty ends with striping out rows that do not have an
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# href to edit.php and do not have the domain name we are looking for.
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# So all we should be left with is CSV of table of subdomains we are
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# interested in.
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# Now we have to read through this table and extract the data we need
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lines="$(echo "$subdomain_csv" | wc -l)"
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i=0
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found=0
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while [ "$i" -lt "$lines" ]; do
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i="$(_math "$i" + 1)"
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line="$(echo "$subdomain_csv" | sed -n "${i}p")"
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_debug2 line "$line"
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DNSname="$(echo "$line" | _egrep_o 'edit.php.*</a>' | cut -d '>' -f 2 | cut -d '<' -f 1)"
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_debug2 DNSname "$DNSname"
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DNStype="$(echo "$line" | sed 's/<td/@<td/g' | tr '@' '\n' | sed -n '4p' | cut -d '>' -f 2 | cut -d '<' -f 1)"
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_debug2 DNStype "$DNStype"
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if [ "$DNSname" = "$fulldomain" ] && [ "$DNStype" = "TXT" ]; then
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DNSdataid="$(echo "$line" | _egrep_o 'data_id=.*' | cut -d = -f 2 | cut -d '>' -f 1)"
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_debug2 DNSdataid "$DNSdataid"
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DNSvalue="$(echo "$line" | sed 's/<td/@<td/g' | tr '@' '\n' | sed -n '5p' | cut -d '>' -f 2 | cut -d '<' -f 1)"
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_debug2 DNSvalue "$DNSvalue"
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# if [ "$DNSvalue" = "$txtvalue" ]; then
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# Testing value match fails. Website is truncating the value
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# field. So for now we will assume that there is only one TXT
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# field for the sub domain and just delete it. Currently this
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# is a safe assumption.
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_freedns_delete_txt_record "$FREEDNS_COOKIE" "$DNSdataid"
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return $?
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# fi
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fi
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done
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done
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# If we get this far we did not find a match (after two attempts)
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# Not necessarily an error, but log anyway.
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_debug2 "$subdomain_csv"
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_info "Cannot delete TXT record for $fulldomain/$txtvalue. Does not exist at FreeDNS"
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return 0
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}
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#################### Private functions below ##################################
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# usage: _freedns_login username password
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# print string "cookie=value" etc.
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# returns 0 success
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_freedns_login() {
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export _H1="Accept-Language:en-US"
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username="$1"
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password="$2"
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url="https://freedns.afraid.org/zc.php?step=2"
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_debug "Login to FreeDNS as user $username"
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htmlpage="$(_post "username=$(printf '%s' "$username" | _url_encode)&password=$(printf '%s' "$password" | _url_encode)&submit=Login&action=auth" "$url")"
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if [ "$?" != "0" ]; then
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_err "FreeDNS login failed for user $username bad RC from _post"
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return 1
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fi
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cookies="$(grep -i '^Set-Cookie.*dns_cookie.*$' "$HTTP_HEADER" | _head_n 1 | tr -d "\r\n" | cut -d " " -f 2)"
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# if cookies is not empty then logon successful
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if [ -z "$cookies" ]; then
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_debug "$htmlpage"
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_err "FreeDNS login failed for user $username. Check $HTTP_HEADER file"
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return 1
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fi
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printf "%s" "$cookies"
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return 0
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}
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# usage _freedns_retrieve_subdomain_page login_cookies
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# echo page retrieved (html)
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# returns 0 success
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_freedns_retrieve_subdomain_page() {
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export _H1="Cookie:$1"
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export _H2="Accept-Language:en-US"
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url="https://freedns.afraid.org/subdomain/"
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_debug "Retrieve subdomain page from FreeDNS"
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htmlpage="$(_get "$url")"
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if [ "$?" != "0" ]; then
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_err "FreeDNS retrieve subdomains failed bad RC from _get"
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return 1
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elif [ -z "$htmlpage" ]; then
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_err "FreeDNS returned empty subdomain page"
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return 1
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fi
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_debug2 "$htmlpage"
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printf "%s" "$htmlpage"
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return 0
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}
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# usage _freedns_add_txt_record login_cookies domain_id subdomain value
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# returns 0 success
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_freedns_add_txt_record() {
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export _H1="Cookie:$1"
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export _H2="Accept-Language:en-US"
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domain_id="$2"
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subdomain="$3"
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value="$(printf '%s' "$4" | _url_encode)"
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url="http://freedns.afraid.org/subdomain/save.php?step=2"
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htmlpage="$(_post "type=TXT&domain_id=$domain_id&subdomain=$subdomain&address=%22$value%22&send=Save%21" "$url")"
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if [ "$?" != "0" ]; then
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_err "FreeDNS failed to add TXT record for $subdomain bad RC from _post"
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return 1
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elif ! grep "200 OK" "$HTTP_HEADER" >/dev/null; then
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_debug "$htmlpage"
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_err "FreeDNS failed to add TXT record for $subdomain. Check $HTTP_HEADER file"
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return 1
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elif _contains "$htmlpage" "security code was incorrect"; then
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_debug "$htmlpage"
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_err "FreeDNS failed to add TXT record for $subdomain as FreeDNS requested security code"
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_err "Note that you cannot use automatic DNS validation for FreeDNS public domains"
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return 1
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fi
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_debug2 "$htmlpage"
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_info "Added acme challenge TXT record for $fulldomain at FreeDNS"
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return 0
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}
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# usage _freedns_delete_txt_record login_cookies data_id
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# returns 0 success
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_freedns_delete_txt_record() {
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export _H1="Cookie:$1"
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export _H2="Accept-Language:en-US"
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data_id="$2"
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url="https://freedns.afraid.org/subdomain/delete2.php"
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htmlheader="$(_get "$url?data_id%5B%5D=$data_id&submit=delete+selected" "onlyheader")"
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if [ "$?" != "0" ]; then
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_err "FreeDNS failed to delete TXT record for $data_id bad RC from _get"
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return 1
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elif ! _contains "$htmlheader" "200 OK"; then
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_debug "$htmlheader"
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_err "FreeDNS failed to delete TXT record $data_id"
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return 1
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fi
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_info "Deleted acme challenge TXT record for $fulldomain at FreeDNS"
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return 0
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}
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