Syslog: introduce interfaces for e-mail sending

Interfaces to configure multiple e-mail destinations, each with an
individual threshold for the priority level of the syslog messages.

The idea is to

Syslog: introduce interfaces for e-mail sending

Interfaces to configure multiple e-mail destinations, each with an
individual threshold for the priority level of the syslog messages.

The idea is to provide facilities to implement a minimally useful subset
of Redfish Event Destinations for e-mail with ability to add additional
properties if the need arises.

D-Bus object path for each destination contains 8 digits of a mailto
hash, so Level can be changed later but for another URI a new object
needs to be created.

Current set of properties is made on assumption that organisation has an
SMTP smarthost (that BMC is allowed to use without authentication) which
takes care of dispatching messages; rsyslog's ommail module is
considered for the initial implementation.

Example session:

root@qemuarm:~# busctl tree xyz.openbmc_project.Syslog.Config
└─/xyz
└─/xyz/openbmc_project
└─/xyz/openbmc_project/logging
└─/xyz/openbmc_project/logging/config
├─/xyz/openbmc_project/logging/config/mail
│ ├─/xyz/openbmc_project/logging/config/mail/2dc1e699
│ ├─/xyz/openbmc_project/logging/config/mail/5d43d672
│ ├─/xyz/openbmc_project/logging/config/mail/b4dc9055
│ ├─/xyz/openbmc_project/logging/config/mail/d5d4db03
│ └─/xyz/openbmc_project/logging/config/mail/e0974603
└─/xyz/openbmc_project/logging/config/remote
root@qemuarm:~# busctl introspect xyz.openbmc_project.Syslog.Config /xyz/openbmc_project/logging/config/mail
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.DBus.Introspectable interface - - -
.Introspect method - s -
org.freedesktop.DBus.Peer interface - - -
.GetMachineId method - s -
.Ping method - - -
org.freedesktop.DBus.Properties interface - - -
.Get method ss v -
.GetAll method s a{sv} -
.Set method ssv - -
.PropertiesChanged signal sa{sv}as - -
xyz.openbmc_project.Collection.DeleteAll interface - - -
.DeleteAll method - - -
xyz.openbmc_project.Logging.Syslog.Destination.Mail interface - - -
.From property s "from@some.domain" emits-change writable
xyz.openbmc_project.Logging.Syslog.Destination.Mail.Create interface - - -
.Create method ss o -
xyz.openbmc_project.Network.Client interface - - -
.Address property s "smarthost.lan" emits-change writable
.Port property q 25 emits-change writable
xyz.openbmc_project.Object.Enable interface - - -
.Enabled property b true emits-change writable
root@qemuarm:~# busctl introspect xyz.openbmc_project.Syslog.Config /xyz/openbmc_project/logging/config/mail/d5d4db03
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.DBus.Introspectable interface - - -
.Introspect method - s -
org.freedesktop.DBus.Peer interface - - -
.GetMachineId method - s -
.Ping method - - -
org.freedesktop.DBus.Properties interface - - -
.Get method ss v -
.GetAll method s a{sv} -
.Set method ssv - -
.PropertiesChanged signal sa{sv}as - -
xyz.openbmc_project.Logging.Syslog.Destination.Mail.Entry interface - - -
.Level property s "xyz.openbmc_project.Logging.Entry.Leve… emits-change writable
.Mailto property s "mailto://someone2@otherdomain.test" emits-change
xyz.openbmc_project.Object.Delete interface - - -
.Delete method - - -

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Change-Id: Ic78fc2bf3608c1dd7ec0c962412e69062dde48d4

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