Added as below:
smtp_starttls:
prober: tcp
timeout: 20s
tcp:
tls_config: # add here?
ca_file: "/certs/my_cert.crt" # add here?
query_response:
- expect: "^220 ([^ ]+) ESMTP"
send: "EHLO prober\r"
- expect: "^250-STARTTLS"
- expect: "^250 .*$"
send: "STARTTLS\r"
- expect: "^220"
starttls: true
- send: "EHLO prober\r"
- expect: "^250 .*$"
send: "QUIT\r"
My blackbox is running as a pod in a k8s cluster. Do you have good
suggestion to store the cert file?
On Tuesday, July 5, 2022 at 4:09:08 PM UTC+8 nina guo wrote:
> Thank you very much.
>
> I changed to connect with DNS name. So according to the error msg,
> following your kind suggestion, I need to go with [^2], am I right?
>
> ts=2022-07-05T07:32:17.495596017Z caller=main.go:130 module=smtp_starttls
> target=mailserver:25 level=error msg="TLS Handshake (client) failed"
> err="x509: certificate signed by unknown authority"
>
> On Tuesday, July 5, 2022 at 3:58:09 PM UTC+8 Brian Candler wrote:
>
>> Problem 1: timeout / regexp mismatch
>>
>> > ts=2022-07-05T02:29:41.609572861Z caller=main.go:130
>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>> line="220 mail.com ESMTP"
>> > ts=2022-07-05T02:29:46.607798497Z caller=main.go:130
>> module=smtp_starttls target=11.1.1.1:25 level=error msg="Error reading
>> from connection" err="read tcp4 0.0.0.0:57074->1.1.1.1:25: i/o timeout"
>>
>> You asked it to match "^220 ([^ ]+) ESMTP (.+)$" which means:
>>
>> - "220"
>> - <space>
>> - 1 or more <non-space>
>> - <space>
>> - "ESMTP"
>> - <space>
>> - 1 or more <any-character>
>> - end of line
>>
>> But in the banner you got back from the target host, there's nothing
>> after the word "ESMTP": the line ends there immediately. Hence you were
>> right to change the regexp.
>>
>> "I'm not sure if the change is acceptable from blackbox's view" -
>> Blackbox will do whatever you ask it to do. If you want to match both
>> cases (i.e. mail servers which do and don't put any text after "ESMTP"),
>> then use a regexp which does that:
>>
>> "^220 ([^ ]+) ESMTP( .+)?$"
>>
>> or
>>
>> "^220 ([^ ]+) ESMTP.*$"
>>
>> or even just
>>
>> "^220 ([^ ]+) ESMTP"
>>
>> (no need to match all the way to the end of the line)
>>
>> Problem 2: TLS handshake failed
>>
>> * You asked Blackbox Exporter to connect to a host by IP address
>> (1.1.1.1), instead of using a DNS name (smtp.example.com)
>> * Therefore, Blackbox Exporter cannot verify the certificate unless the
>> certificate itself contains an IP address
>>
>> It's the same as if you put https://1.1.1.1/ in your web browser.
>> There's no way the browser can validate the certificate, unless the
>> certificate itself contains IP address "1.1.1.1". And that is a very
>> uncommon sort of certificate.
>>
>> Please, try *exactly* the command I gave you before:
>> *curl -g
>> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>>
>> No changes. Copy-paste exactly that, with the hostname "
>> aspmx.l.google.com" in it. You should find that it verifies correctly,
>> as long as the ESMTP regexp matches OK.
>>
>> Then to get it to work with your own mail server, you will need to do
>> exactly the same:
>> * Refer to your mail server by its DNS name, not IP address, when asking
>> blackbox_exporter to test it
>> * The mail server must have a certificate which contains this name [^1]
>> * The mail server's certificate must be signed by a certificate authority
>> that blackbox_exporter trusts [^2]
>> * The mail server's certificate must not have expired, i.e. the current
>> time is within its notBefore and notAfter times
>>
>> [^1] If you still want to connect to the server by IP address but check
>> for a different name in the certificate, then use the "server_name" setting
>> in tls_config: see
>> https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
>>
>> [^2] If the certificate authority that signed your mail server's
>> certificate is not in the system trust store then use the "ca_file" setting
>> in tls_config: see
>> https://github.com/prometheus/blackbox_exporter/blob/v0.21.1/example.yml#L53-L54
>>
>> Or you can give up, and use "insecure_skip_verify: true" to disable
>> certificate validation altogether:
>> https://github.com/prometheus/blackbox_exporter/blob/v0.21.1/example.yml#L27-L28
>> (although then you lose valuable tests, because if your certificate was
>> valid and becomes invalid you won't know. I also note that if you can't
>> get blackbox_exporter to validate the certificate, then your clients
>> probably won't be able to validate it either)
>>
>> At this point, it isn't really an issue with blackbox_exporter any more:
>> it's a case of understanding how certificates and certificate validation
>> work.
>>
>> On Tuesday, 5 July 2022 at 05:53:46 UTC+1 [email protected] wrote:
>>
>>> I tried to change the first expect to ^220 ([^ ]+) ESMTP$. But I'm not
>>> sure if the change is acceptable from blackbox's view.
>>>
>>> smtp_starttls:
>>> prober: tcp
>>> timeout: 20s
>>> tcp:
>>> query_response:
>>> #- expect: "^220 ([^ ]+) ESMTP (.+)$"
>>> - expect: "^220 ([^ ]+) ESMTP$"
>>>
>>> send: "EHLO prober\r"
>>> - expect: "^250-STARTTLS"
>>> - expect: "^250 .*$"
>>> send: "STARTTLS\r"
>>> - expect: "^220"
>>> starttls: true
>>> - send: "EHLO prober\r"
>>> - expect: "^250 .*$"
>>> send: "QUIT\r"
>>>
>>>
>>> Curled and got the following error. Does it mean the mail server doesn't
>>> contain any IP SANs? And on mail server certificate cannot be validated?
>>> ts=2022-07-05T04:18:10.539326118Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=error msg="TLS Handshake
>>> (client) failed" err="x509: cannot validate certificate for 1.1.1.1 because
>>> it doesn't contain any IP SANs"
>>>
>>> curl -g '
>>> http://0.0.0.0:9115/probe?module=smtp_starttls&target=1.1.1.1:25&debug=true
>>> '
>>> Logs for the probe:
>>> ts=2022-07-05T04:18:10.527958378Z caller=main.go:320
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Beginning probe"
>>> probe=tcp timeout_seconds=20
>>> ts=2022-07-05T04:18:10.528040568Z caller=tcp.go:40 module=smtp_starttls
>>> target=1.1.1.1:25 level=info msg="Resolving target address"
>>> ip_protocol=ip6
>>> ts=2022-07-05T04:18:10.528063021Z caller=tcp.go:40 module=smtp_starttls
>>> target=1.1.1.1:25 level=info msg="Resolving target address"
>>> ip_protocol=ip4
>>> ts=2022-07-05T04:18:10.528076698Z caller=tcp.go:40 module=smtp_starttls
>>> target=1.1.1.1:25 level=info msg="Resolved target address" ip=1.1.1.1
>>> ts=2022-07-05T04:18:10.528115109Z caller=tcp.go:121 module=smtp_starttls
>>> target=1.1.1.1:25 level=info msg="Dialing TCP without TLS"
>>> ts=2022-07-05T04:18:10.529223463Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Successfully
>>> dialed"
>>> ts=2022-07-05T04:18:10.529258037Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Processing query
>>> response entry" entry_number=0
>>> ts=2022-07-05T04:18:10.530236839Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line="220 mail.com ESMTP"
>>> ts=2022-07-05T04:18:10.530278493Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Regexp matched"
>>> regexp="^220 ([^ ]+) ESMTP$" line="220 mail.com ESMTP"
>>> ts=2022-07-05T04:18:10.53030557Z caller=main.go:130 module=smtp_starttls
>>> target=1.1.1.1:25 level=debug msg="Sending line" line="EHLO prober\r"
>>> ts=2022-07-05T04:18:10.530348868Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Processing query
>>> response entry" entry_number=1
>>> ts=2022-07-05T04:18:10.530919204Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line" line=
>>> 250-mail.com
>>> ts=2022-07-05T04:18:10.530955761Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line=250-PIPELINING
>>> ts=2022-07-05T04:18:10.530971243Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line="250-SIZE 10240000"
>>> ts=2022-07-05T04:18:10.530985701Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line=250-ETRN
>>> ts=2022-07-05T04:18:10.531006196Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line=250-STARTTLS
>>> ts=2022-07-05T04:18:10.531025088Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Regexp matched"
>>> regexp=^250-STARTTLS line=250-STARTTLS
>>> ts=2022-07-05T04:18:10.531045174Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Processing query
>>> response entry" entry_number=2
>>> ts=2022-07-05T04:18:10.531064549Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line="250-AUTH PLAIN LOGIN"
>>> ts=2022-07-05T04:18:10.531077325Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line=250-ENHANCEDSTATUSCODES
>>> ts=2022-07-05T04:18:10.531088466Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line=250-8BITMIME
>>> ts=2022-07-05T04:18:10.53110099Z caller=main.go:130 module=smtp_starttls
>>> target=1.1.1.1:25 level=debug msg="Read line" line="250 DSN"
>>> ts=2022-07-05T04:18:10.531134286Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Regexp matched"
>>> regexp="^250 .*$" line="250 DSN"
>>> ts=2022-07-05T04:18:10.531186418Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Sending line"
>>> line="STARTTLS\r"
>>> ts=2022-07-05T04:18:10.531234743Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Processing query
>>> response entry" entry_number=3
>>> ts=2022-07-05T04:18:10.531762621Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>> line="220 2.0.0 Ready to start TLS"
>>> ts=2022-07-05T04:18:10.531779841Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Regexp matched"
>>> regexp=^220 line="220 2.0.0 Ready to start TLS"
>>> ts=2022-07-05T04:18:10.539326118Z caller=main.go:130
>>> module=smtp_starttls target=1.1.1.1:25 level=error msg="TLS Handshake
>>> (client) failed" err="x509: cannot validate certificate for 1.1.1.1 because
>>> it doesn't contain any IP SANs"
>>> ts=2022-07-05T04:18:10.53937693Z caller=main.go:320 module=smtp_starttls
>>> target=1.1.1.1:25 level=error msg="Probe failed"
>>> duration_seconds=0.011375261
>>>
>>> On Tuesday, July 5, 2022 at 12:03:50 PM UTC+8 nina guo wrote:
>>>
>>>> I may find the root cause - comparing the output between google's mail
>>>> server and my mail server
>>>>
>>>> my mail server
>>>> ts=2022-07-05T02:29:41.608566903Z caller=main.go:130
>>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Successfully
>>>> dialed"
>>>> ts=2022-07-05T02:29:41.608652361Z caller=main.go:130
>>>> module=smtp_starttls target=1.1.1.1:25 level=info msg="Processing
>>>> query response entry" entry_number=0
>>>> ts=2022-07-05T02:29:41.609572861Z caller=main.go:130
>>>> module=smtp_starttls target=1.1.1.1:25 level=debug msg="Read line"
>>>> line="220 mail.com ESMTP"
>>>> ts=2022-07-05T02:29:46.607798497Z caller=main.go:130
>>>> module=smtp_starttls target=11.1.1.1:25 level=error msg="Error reading
>>>> from connection" err="read tcp4 0.0.0.0:57074->1.1.1.1:25: i/o timeout"
>>>>
>>>> google's mail server
>>>> ts=2022-07-05T02:04:33.385587664Z caller=main.go:130
>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>> msg="Successfully dialed"
>>>> ts=2022-07-05T02:04:33.385613189Z caller=main.go:130
>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>> msg="Processing query response entry" entry_number=0
>>>> ts=2022-07-05T02:04:33.419235886Z caller=main.go:130
>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>> line" line="220 mx.google.com ESMTP
>>>> dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>>>> ts=2022-07-05T02:04:33.419280493Z caller=main.go:130
>>>> module=smtp_starttls target=142.250.102.27:25 level=info msg="Regexp
>>>> matched" regexp="^220 ([^ ]+) ESMTP (.+)$" line="220 mx.google.com
>>>> ESMTP dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>>>>
>>>> From the output it shows the regex is not matched for my mail server -
>>>> ^220 ([^ ]+) ESMTP (.+)$
>>>>
>>>> In config file
>>>> smtp_starttls:
>>>> prober: tcp
>>>> timeout: 20s
>>>>
>>>> tcp:
>>>> query_response:
>>>> - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>> send: "EHLO prober\r"
>>>> - expect: "^250-STARTTLS"
>>>> - expect: "^250 .*$"
>>>> send: "STARTTLS\r"
>>>>
>>>> - expect: "^220"
>>>> starttls: true
>>>> - send: "EHLO prober\r"
>>>> - expect: "^250 .*$"
>>>> send: "QUIT\r"
>>>> On Tuesday, July 5, 2022 at 11:40:06 AM UTC+8 nina guo wrote:
>>>>
>>>>> I searched this info blackbox_exporter for SMTP monitoring w/ TCP
>>>>> module : PrometheusMonitoring (reddit.com)
>>>>> <https://www.reddit.com/r/PrometheusMonitoring/comments/q60357/blackbox_exporter_for_smtp_monitoring_w_tcp_module/>
>>>>> ,
>>>>> added "\r", but still got the same issue..
>>>>>
>>>>> On Tuesday, July 5, 2022 at 11:26:49 AM UTC+8 nina guo wrote:
>>>>>
>>>>>> telnet got succeed.
>>>>>>
>>>>>> telnet 1.1.1.1 25
>>>>>> Trying 1.1.1.1...
>>>>>> Connected to 1.1.1.1.
>>>>>> Escape character is '^]'.
>>>>>> 220 ... ESMTP
>>>>>
>>>>>
>>>>>>
>>>>>> On Tuesday, July 5, 2022 at 11:11:48 AM UTC+8 nina guo wrote:
>>>>>>
>>>>>>> Probe failed due to TLS issue...it is not the same issue with my
>>>>>>> mail server..
>>>>>>> There is no "i/o timeout" issue for google's mail server.
>>>>>>>
>>>>>>> curl -g '
>>>>>>> http://0.0.0.0:9115/probe?module=smtp_starttls&target=142.250.102.27:25&debug=true
>>>>>>>
>>>>>>> <http://100.100.3.9:9115/probe?module=smtp_starttls&target=142.250.102.27:25&debug=true>
>>>>>>> '
>>>>>>> Logs for the probe:
>>>>>>> ts=2022-07-05T02:04:33.373763474Z caller=main.go:320
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Beginning probe" probe=tcp timeout_seconds=5
>>>>>>> ts=2022-07-05T02:04:33.373850167Z caller=tcp.go:40
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Resolving target address" ip_protocol=ip6
>>>>>>> ts=2022-07-05T02:04:33.373867876Z caller=tcp.go:40
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Resolving target address" ip_protocol=ip4
>>>>>>> ts=2022-07-05T02:04:33.373882263Z caller=tcp.go:40
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Resolved target address" ip=142.250.102.27
>>>>>>> ts=2022-07-05T02:04:33.373903614Z caller=tcp.go:121
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Dialing TCP without TLS"
>>>>>>> ts=2022-07-05T02:04:33.385587664Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Successfully dialed"
>>>>>>> ts=2022-07-05T02:04:33.385613189Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Processing query response entry" entry_number=0
>>>>>>> ts=2022-07-05T02:04:33.419235886Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line="220 mx.google.com ESMTP
>>>>>>> dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>>>>>>> ts=2022-07-05T02:04:33.419280493Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Regexp matched" regexp="^220 ([^ ]+) ESMTP (.+)$" line="220
>>>>>>> mx.google.com ESMTP
>>>>>>> dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
>>>>>>> ts=2022-07-05T02:04:33.419310506Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug
>>>>>>> msg="Sending line" line="EHLO prober"
>>>>>>> ts=2022-07-05T02:04:33.419356415Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Processing query response entry" entry_number=1
>>>>>>> ts=2022-07-05T02:04:33.43519464Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line="250-mx.google.com at your service, [130.214.226.41]"
>>>>>>> ts=2022-07-05T02:04:33.435229899Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line="250-SIZE 157286400"
>>>>>>> ts=2022-07-05T02:04:33.435242182Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line=250-8BITMIME
>>>>>>> ts=2022-07-05T02:04:33.435254457Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line=250-STARTTLS
>>>>>>> ts=2022-07-05T02:04:33.435270364Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Regexp matched" regexp=^250-STARTTLS line=250-STARTTLS
>>>>>>> ts=2022-07-05T02:04:33.435285968Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Processing query response entry" entry_number=2
>>>>>>> ts=2022-07-05T02:04:33.435310813Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line=250-ENHANCEDSTATUSCODES
>>>>>>> ts=2022-07-05T02:04:33.435323258Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line=250-PIPELINING
>>>>>>> ts=2022-07-05T02:04:33.435337373Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line=250-CHUNKING
>>>>>>> ts=2022-07-05T02:04:33.435373931Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line="250 SMTPUTF8"
>>>>>>> ts=2022-07-05T02:04:33.435392537Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>>>> ts=2022-07-05T02:04:33.435409638Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug
>>>>>>> msg="Sending line" line=STARTTLS
>>>>>>> ts=2022-07-05T02:04:33.435451742Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Processing query response entry" entry_number=3
>>>>>>> ts=2022-07-05T02:04:33.449015201Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=debug msg="Read
>>>>>>> line" line="220 2.0.0 Ready to start TLS"
>>>>>>> ts=2022-07-05T02:04:33.449039996Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=info
>>>>>>> msg="Regexp matched" regexp=^220 line="220 2.0.0 Ready to start TLS"
>>>>>>> ts=2022-07-05T02:04:33.476697731Z caller=main.go:130
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=error msg="TLS
>>>>>>> Handshake (client) failed" err="x509: cannot validate certificate for
>>>>>>> 142.250.102.27 because it doesn't contain any IP SANs"
>>>>>>> ts=2022-07-05T02:04:33.47676603Z caller=main.go:320
>>>>>>> module=smtp_starttls target=142.250.102.27:25 level=error
>>>>>>> msg="Probe failed" duration_seconds=0.102953678
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Metrics that would have been returned:
>>>>>>> # HELP probe_dns_lookup_time_seconds Returns the time taken for
>>>>>>> probe dns lookup in seconds
>>>>>>> # TYPE probe_dns_lookup_time_seconds gauge
>>>>>>> probe_dns_lookup_time_seconds 5.1452e-05
>>>>>>>
>>>>>>> # HELP probe_duration_seconds Returns how long the probe took to
>>>>>>> complete in seconds
>>>>>>> # TYPE probe_duration_seconds gauge
>>>>>>> probe_duration_seconds 0.102953678
>>>>>>>
>>>>>>> # HELP probe_failed_due_to_regex Indicates if probe failed due to
>>>>>>> regex
>>>>>>> # TYPE probe_failed_due_to_regex gauge
>>>>>>> probe_failed_due_to_regex 0
>>>>>>> # HELP probe_ip_addr_hash Specifies the hash of IP address. It's
>>>>>>> useful to detect if the IP address changes.
>>>>>>> # TYPE probe_ip_addr_hash gauge
>>>>>>> probe_ip_addr_hash 9.60720384e+08
>>>>>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is IP4
>>>>>>> or IP6
>>>>>>> # TYPE probe_ip_protocol gauge
>>>>>>> probe_ip_protocol 4
>>>>>>> # HELP probe_success Displays whether or not the probe was a success
>>>>>>> # TYPE probe_success gauge
>>>>>>> probe_success 0
>>>>>>>
>>>>>>> Module configuration:
>>>>>>> prober: tcp
>>>>>>> timeout: 5s
>>>>>>> http:
>>>>>>> ip_protocol_fallback: true
>>>>>>> follow_redirects: true
>>>>>>> tcp:
>>>>>>> ip_protocol_fallback: true
>>>>>>> query_response:
>>>>>>> - expect: ^220 ([^ ]+) ESMTP (.+)$
>>>>>>> send: EHLO prober
>>>>>>> - expect: ^250-STARTTLS
>>>>>>> - expect: ^250 .*$
>>>>>>> send: STARTTLS
>>>>>>> - expect: ^220
>>>>>>> starttls: true
>>>>>>> - send: EHLO prober
>>>>>>> - expect: ^250 .*$
>>>>>>> send: QUIT
>>>>>>> icmp:
>>>>>>> ip_protocol_fallback: true
>>>>>>> dns:
>>>>>>> ip_protocol_fallback: true
>>>>>>>
>>>>>>>
>>>>>>> On Monday, July 4, 2022 at 8:44:49 PM UTC+8 Brian Candler wrote:
>>>>>>>
>>>>>>>> And if you try it with Google's mail server?
>>>>>>>> *curl -g
>>>>>>>> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>>>>>>>>
>>>>>>>> On Monday, 4 July 2022 at 12:50:47 UTC+1 [email protected] wrote:
>>>>>>>>
>>>>>>>>> Still received the same error msg:
>>>>>>>>>
>>>>>>>>> curl -g '
>>>>>>>>> http://0.0.0.0:9115/probe?module=smtp_starttls&target=1.1.1.1:25&debug=true
>>>>>>>>> '
>>>>>>>>> Logs for the probe:
>>>>>>>>> ts=2022-07-04T11:47:59.071097704Z caller=main.go:320
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Beginning
>>>>>>>>> probe"
>>>>>>>>> probe=tcp timeout_seconds=5
>>>>>>>>> ts=2022-07-04T11:47:59.071251831Z caller=tcp.go:40
>>>>>>>>> module=smtp_starttls target=1 1.1.1.1 :25 level=info msg="Resolving
>>>>>>>>> target
>>>>>>>>> address" ip_protocol=ip6
>>>>>>>>> ts=2022-07-04T11:47:59.071292289Z caller=tcp.go:40
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Resolving
>>>>>>>>> target
>>>>>>>>> address" ip_protocol=ip4
>>>>>>>>> ts=2022-07-04T11:47:59.071327224Z caller=tcp.go:40
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Resolved
>>>>>>>>> target
>>>>>>>>> address" ip= 1.1.1.1
>>>>>>>>> ts=2022-07-04T11:47:59.071354819Z caller=tcp.go:121
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Dialing TCP
>>>>>>>>> without TLS"
>>>>>>>>> ts=2022-07-04T11:47:59.072469713Z caller=main.go:130
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info
>>>>>>>>> msg="Successfully
>>>>>>>>> dialed"
>>>>>>>>> ts=2022-07-04T11:47:59.072508076Z caller=main.go:130
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=info msg="Processing
>>>>>>>>> query
>>>>>>>>> response entry" entry_number=0
>>>>>>>>> ts=2022-07-04T11:47:59.073453639Z caller=main.go:130
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=debug msg="Read line"
>>>>>>>>> line="220 ESMTP"
>>>>>>>>> ts=2022-07-04T11:48:04.072081695Z caller=main.go:130
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=error msg="Error
>>>>>>>>> reading
>>>>>>>>> from connection" err="read tcp4 0.0.0.0:53872->1.1.1.1:25: i/o
>>>>>>>>> timeout"
>>>>>>>>> ts=2022-07-04T11:48:04.072269643Z caller=main.go:320
>>>>>>>>> module=smtp_starttls target= 1.1.1.1 :25 level=error msg="Probe
>>>>>>>>> failed"
>>>>>>>>> duration_seconds=5.00106792
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Metrics that would have been returned:
>>>>>>>>> # HELP probe_dns_lookup_time_seconds Returns the time taken for
>>>>>>>>> probe dns lookup in seconds
>>>>>>>>> # TYPE probe_dns_lookup_time_seconds gauge
>>>>>>>>> probe_dns_lookup_time_seconds 0.000101683
>>>>>>>>> # HELP probe_duration_seconds Returns how long the probe took to
>>>>>>>>> complete in seconds
>>>>>>>>> # TYPE probe_duration_seconds gauge
>>>>>>>>> probe_duration_seconds 5.00106792
>>>>>>>>> # HELP probe_failed_due_to_regex Indicates if probe failed due to
>>>>>>>>> regex
>>>>>>>>> # TYPE probe_failed_due_to_regex gauge
>>>>>>>>> probe_failed_due_to_regex 0
>>>>>>>>> # HELP probe_ip_addr_hash Specifies the hash of IP address. It's
>>>>>>>>> useful to detect if the IP address changes.
>>>>>>>>> # TYPE probe_ip_addr_hash gauge
>>>>>>>>> probe_ip_addr_hash 2.493392506e+09
>>>>>>>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is
>>>>>>>>> IP4 or IP6
>>>>>>>>> # TYPE probe_ip_protocol gauge
>>>>>>>>> probe_ip_protocol 4
>>>>>>>>> # HELP probe_success Displays whether or not the probe was a
>>>>>>>>> success
>>>>>>>>> # TYPE probe_success gauge
>>>>>>>>> probe_success 0
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Module configuration:
>>>>>>>>> prober: tcp
>>>>>>>>> timeout: 5s
>>>>>>>>> http:
>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>> follow_redirects: true
>>>>>>>>> tcp:
>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>> query_response:
>>>>>>>>> - expect: ^220 ([^ ]+) ESMTP (.+)$
>>>>>>>>> send: EHLO prober
>>>>>>>>> - expect: ^250-STARTTLS
>>>>>>>>> - expect: ^250 .*$
>>>>>>>>> send: STARTTLS
>>>>>>>>> - expect: ^220
>>>>>>>>> starttls: true
>>>>>>>>> - send: EHLO prober
>>>>>>>>> - expect: ^250 .*$
>>>>>>>>> send: QUIT
>>>>>>>>> icmp:
>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>> dns:
>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>>
>>>>>>>>> On Monday, July 4, 2022 at 7:22:08 PM UTC+8 Brian Candler wrote:
>>>>>>>>>
>>>>>>>>>> Could you first just try copy-pasting the working config I gave
>>>>>>>>>> you, and see if it gives a different result to yours?
>>>>>>>>>>
>>>>>>>>>> I doubt a mail server would take more than 5 seconds to give a
>>>>>>>>>> banner, but it's possible. Simply doing "telnet x.x.x.x 25" will
>>>>>>>>>> show you
>>>>>>>>>> how your mail server behaves.
>>>>>>>>>>
>>>>>>>>>> On Monday, 4 July 2022 at 11:14:23 UTC+1 [email protected]
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Yes in my code the first expect is quoted.
>>>>>>>>>>>
>>>>>>>>>>> smtp_starttls:
>>>>>>>>>>> prober: tcp
>>>>>>>>>>> timeout: 5s
>>>>>>>>>>> tcp:
>>>>>>>>>>> query_response:
>>>>>>>>>>> - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>>>>>>>>> - send: "EHLO prober\r"
>>>>>>>>>>> - expect: "^250-STARTTLS"
>>>>>>>>>>> - send: "STARTTLS\r"
>>>>>>>>>>> - expect: "^220"
>>>>>>>>>>> - starttls: true
>>>>>>>>>>> - send: "EHLO prober\r"
>>>>>>>>>>> - expect: "^250-AUTH"
>>>>>>>>>>> - send: "QUIT\r"
>>>>>>>>>>>
>>>>>>>>>>> Probably due to the "timeout" is too less? Should I adjust 5s to
>>>>>>>>>>> 15s or 60s?
>>>>>>>>>>> On Monday, July 4, 2022 at 5:55:09 PM UTC+8 Brian Candler wrote:
>>>>>>>>>>>
>>>>>>>>>>>> The following works for me with blackbox_exporter 0.21.0 (maybe
>>>>>>>>>>>> your first 'expect' regexp needs to be quoted?)
>>>>>>>>>>>>
>>>>>>>>>>>> modules:
>>>>>>>>>>>> smtp_starttls:
>>>>>>>>>>>> prober: tcp
>>>>>>>>>>>> timeout: 5s
>>>>>>>>>>>> tcp:
>>>>>>>>>>>> query_response:
>>>>>>>>>>>> - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>>>>>>>>>> send: "EHLO prober"
>>>>>>>>>>>> - expect: "^250-STARTTLS"
>>>>>>>>>>>> - expect: "^250 .*$"
>>>>>>>>>>>> send: "STARTTLS"
>>>>>>>>>>>> - expect: "^220"
>>>>>>>>>>>>
>>>>>>>>>>>> starttls: true
>>>>>>>>>>>> - send: "EHLO prober"
>>>>>>>>>>>> - expect: "^250 .*$"
>>>>>>>>>>>> send: "QUIT"
>>>>>>>>>>>>
>>>>>>>>>>>> Result:
>>>>>>>>>>>>
>>>>>>>>>>>> # *curl -g
>>>>>>>>>>>> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>>>>>>>>>>>> Logs for the probe:
>>>>>>>>>>>> ts=2022-07-04T09:50:46.764604425Z caller=main.go:351
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Beginning probe" probe=tcp timeout_seconds=5
>>>>>>>>>>>> ts=2022-07-04T09:50:46.764875668Z caller=tcp.go:40
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Resolving target address" target=aspmx.l.google.com
>>>>>>>>>>>> ip_protocol=ip6
>>>>>>>>>>>> ts=2022-07-04T09:50:46.765954096Z caller=tcp.go:40
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Resolved target address" target=aspmx.l.google.com
>>>>>>>>>>>> ip=2a00:1450:400c:c07::1b
>>>>>>>>>>>> ts=2022-07-04T09:50:46.766011111Z caller=tcp.go:121
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Dialing TCP without TLS"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.776962616Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Successfully dialed"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.77708032Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Processing query response entry" entry_number=0
>>>>>>>>>>>> ts=2022-07-04T09:50:46.788075017Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="220 mx.google.com ESMTP
>>>>>>>>>>>> u1-20020a056000038100b0021bbcef3a69si36572085wrf.542 - gsmtp"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.788168204Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Regexp matched" regexp="^220 ([^ ]+) ESMTP (.+)$" line="220
>>>>>>>>>>>> mx.google.com ESMTP
>>>>>>>>>>>> u1-20020a056000038100b0021bbcef3a69si36572085wrf.542 - gsmtp"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.788223914Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Sending line" line="EHLO prober"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.788362926Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Processing query response entry" entry_number=1
>>>>>>>>>>>> ts=2022-07-04T09:50:46.801755535Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="250-mx.google.com at your service,
>>>>>>>>>>>> [xx:xx:xx:xx::33]"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.801856147Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="250-SIZE 157286400"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.801889927Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-8BITMIME
>>>>>>>>>>>> ts=2022-07-04T09:50:46.801922312Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-STARTTLS
>>>>>>>>>>>> ts=2022-07-04T09:50:46.801955499Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Regexp matched" regexp=^250-STARTTLS line=250-STARTTLS
>>>>>>>>>>>> ts=2022-07-04T09:50:46.801989646Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Processing query response entry" entry_number=2
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802029066Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-ENHANCEDSTATUSCODES
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802063318Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-PIPELINING
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802094713Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-CHUNKING
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802126198Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="250 SMTPUTF8"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802159858Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802191065Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Sending line" line=STARTTLS
>>>>>>>>>>>> ts=2022-07-04T09:50:46.802271697Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Processing query response entry" entry_number=3
>>>>>>>>>>>> ts=2022-07-04T09:50:46.812211682Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="220 2.0.0 Ready to start TLS"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.812279339Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Regexp matched" regexp=^220 line="220 2.0.0 Ready to start
>>>>>>>>>>>> TLS"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.833573801Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="TLS Handshake (client) succeeded."
>>>>>>>>>>>> ts=2022-07-04T09:50:46.833793385Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Processing query response entry" entry_number=4
>>>>>>>>>>>> ts=2022-07-04T09:50:46.833838422Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Sending line" line="EHLO prober"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.833960852Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Processing query response entry" entry_number=5
>>>>>>>>>>>> ts=2022-07-04T09:50:46.84464181Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="250-mx.google.com at your service,
>>>>>>>>>>>> [xx:xx:xx:xx::33]"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.844771942Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="250-SIZE 157286400"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.844839074Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-8BITMIME
>>>>>>>>>>>> ts=2022-07-04T09:50:46.844910271Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-ENHANCEDSTATUSCODES
>>>>>>>>>>>> ts=2022-07-04T09:50:46.844974538Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-PIPELINING
>>>>>>>>>>>> ts=2022-07-04T09:50:46.845061058Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line=250-CHUNKING
>>>>>>>>>>>> ts=2022-07-04T09:50:46.84512579Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Read line" line="250 SMTPUTF8"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.845193403Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>>>>>>>>> ts=2022-07-04T09:50:46.84525809Z caller=main.go:144
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug
>>>>>>>>>>>> msg="Sending line" line=QUIT
>>>>>>>>>>>> ts=2022-07-04T09:50:46.845583228Z caller=main.go:351
>>>>>>>>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info
>>>>>>>>>>>> msg="Probe succeeded" duration_seconds=0.080912196
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Metrics that would have been returned:
>>>>>>>>>>>> # HELP probe_dns_lookup_time_seconds Returns the time taken for
>>>>>>>>>>>> probe dns lookup in seconds
>>>>>>>>>>>> # TYPE probe_dns_lookup_time_seconds gauge
>>>>>>>>>>>> probe_dns_lookup_time_seconds 0.001103057
>>>>>>>>>>>>
>>>>>>>>>>>> # HELP probe_duration_seconds Returns how long the probe took
>>>>>>>>>>>> to complete in seconds
>>>>>>>>>>>> # TYPE probe_duration_seconds gauge
>>>>>>>>>>>> probe_duration_seconds 0.080912196
>>>>>>>>>>>>
>>>>>>>>>>>> # HELP probe_failed_due_to_regex Indicates if probe failed due
>>>>>>>>>>>> to regex
>>>>>>>>>>>> # TYPE probe_failed_due_to_regex gauge
>>>>>>>>>>>> probe_failed_due_to_regex 0
>>>>>>>>>>>> # HELP probe_ip_addr_hash Specifies the hash of IP address.
>>>>>>>>>>>> It's useful to detect if the IP address changes.
>>>>>>>>>>>> # TYPE probe_ip_addr_hash gauge
>>>>>>>>>>>> probe_ip_addr_hash 2.766777767e+09
>>>>>>>>>>>>
>>>>>>>>>>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is
>>>>>>>>>>>> IP4 or IP6
>>>>>>>>>>>> # TYPE probe_ip_protocol gauge
>>>>>>>>>>>> probe_ip_protocol 6
>>>>>>>>>>>> # HELP probe_ssl_earliest_cert_expiry Returns earliest SSL cert
>>>>>>>>>>>> expiry date
>>>>>>>>>>>> # TYPE probe_ssl_earliest_cert_expiry gauge
>>>>>>>>>>>> probe_ssl_earliest_cert_expiry 1.661764429e+09
>>>>>>>>>>>> # HELP probe_ssl_last_chain_expiry_timestamp_seconds Returns
>>>>>>>>>>>> last SSL chain expiry in unixtime
>>>>>>>>>>>> # TYPE probe_ssl_last_chain_expiry_timestamp_seconds gauge
>>>>>>>>>>>> probe_ssl_last_chain_expiry_timestamp_seconds 1.661764429e+09
>>>>>>>>>>>>
>>>>>>>>>>>> # HELP probe_success Displays whether or not the probe was a
>>>>>>>>>>>> success
>>>>>>>>>>>> # TYPE probe_success gauge
>>>>>>>>>>>> probe_success 1
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Module configuration:
>>>>>>>>>>>> prober: tcp
>>>>>>>>>>>> timeout: 5s
>>>>>>>>>>>> http:
>>>>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>>>>> follow_redirects: true
>>>>>>>>>>>> enable_http2: true
>>>>>>>>>>>>
>>>>>>>>>>>> tcp:
>>>>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>>>>> query_response:
>>>>>>>>>>>> - expect: ^220 ([^ ]+) ESMTP (.+)$
>>>>>>>>>>>> send: EHLO prober
>>>>>>>>>>>> - expect: ^250-STARTTLS
>>>>>>>>>>>> - expect: ^250 .*$
>>>>>>>>>>>> send: STARTTLS
>>>>>>>>>>>> - expect: ^220
>>>>>>>>>>>>
>>>>>>>>>>>> starttls: true
>>>>>>>>>>>> - send: EHLO prober
>>>>>>>>>>>> - expect: ^250 .*$
>>>>>>>>>>>> send: QUIT
>>>>>>>>>>>>
>>>>>>>>>>>> icmp:
>>>>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>>>>> dns:
>>>>>>>>>>>> ip_protocol_fallback: true
>>>>>>>>>>>> recursion_desired: true
>>>>>>>>>>>>
>>>>>>>>>>>
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