* tls_config: Allow specifying SNI hostnames
Add a new configration field `tls_server_name` that allows specifying
the server name that'll be sent in the ClientHello when telegraf makes
a request to TLS servers. This allows checking against load balancers
responding to specific hostnames that otherwise wouldn't resolve to
their addresses.
Add the setting to the documentation of common TLS options, as well as
to the http_response plugin.
Fixes#7598.
* Adjust the x509_cert to allow usage of tls_server_name
This plugin has been using ServerName previously, and will have to
deal with the new setting, too: Extract the server-name choosing into
a method & add a test to ensure we choose the right value (and error
under the right circumstances). Also document that the two settings
are mutually exclusive.
* Improve documentation on what we try to accomplish in the nil return
Also get rid of the TODO, as I am fairly certain this behavior is the
correct one.
* Remove unused struct field in tests
Squashed commits:
[c4e2bee2] Closes#8530: Extended the internal snmp wrapper to support AES192, AES192C, AES256, and AES256C. Updated the example configuration with the new privProtocols. Added the warning that those protocols are only supported if you have the appropriate tooling on your system. Added test to ensure all 4 new privProtocols could be selected and properly encrypt the priv password.
* [http_listener_v2] Stop() succeeds even if fails to start
In cases where the http_listener_v2 plugin config is invalid, when the agent attempts to cleanup by stopping all the inputs, the Stop method here panics as it tries to call listener.Stop() when no listener has been set. This also masks the error message returned from the Start method.
```
> telegraf --test
2020-10-27T12:21:45Z I! Starting Telegraf 1.16.0
2020-10-27T12:21:45Z I! Using config file: /etc/telegraf/telegraf.conf
...
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x1245130]
goroutine 45 [running]:
github.com/influxdata/telegraf/plugins/inputs/http_listener_v2.(*HTTPListenerV2).Stop(0xc00043e000)
/go/src/github.com/influxdata/telegraf/plugins/inputs/http_listener_v2/http_listener_v2.go:178 +0x30
github.com/influxdata/telegraf/agent.stopServiceInputs(0xc00045e480, 0x5, 0x8)
/go/src/github.com/influxdata/telegraf/agent/agent.go:445 +0x82
github.com/influxdata/telegraf/agent.(*Agent).testRunInputs(0xc000288080, 0x32be8c0, 0xc0000f1f00, 0x0, 0xc00000f480, 0x0, 0x0)
/go/src/github.com/influxdata/telegraf/agent/agent.go:434 +0x1b7
github.com/influxdata/telegraf/agent.(*Agent).test.func4(0xc000057b70, 0xc000288080, 0x32be8c0, 0xc0000f1f00, 0x0, 0xc00000f480)
/go/src/github.com/influxdata/telegraf/agent/agent.go:977 +0x8b
created by github.com/influxdata/telegraf/agent.(*Agent).test
/go/src/github.com/influxdata/telegraf/agent/agent.go:975 +0x352
```
This fixes this issue by checking if the listener has been set before calling listener.Stop.
```
> ./telegraf --config test.conf --test
2020-10-27T12:43:25Z I! Starting Telegraf
2020-10-27T12:43:25Z E! [agent] Starting input inputs.http_listener_v2: listen tcp: address address_without_port: missing port in address
```
* retry CI
Add configurable number of 'most recent' date-stamped indices to gather in the Elasticsearch input plugin, and allow wildcards to account for date-suffixed index names. Configuring '3' for num_most_recent_indices will only gather the 3 latest indices, based on the date or number they end with. Finding the date or number is dependent on the targeted indices being configured with wildcards at the end of their 'base' names.
* Allow glob patterns in config
* Update README
* Move creating filter to init
* Need to explictly call init
Co-authored-by: Bas <3441183+BattleBas@users.noreply.github.com>
Newer versions of Telegraf for Windows do not appear to support using WMI query patterns as values for the "pattern" option. Regular expressions appear to be the only patterns now supported.
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