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Distinguish between SMTP and submission ports

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We want to be able to distinguish between connections for SMTP and connections
for submission, so we can make different policy decisions.

To do that, we first make the configuration aware of the different kinds of
addresses. This is done in this patch in a backwards-incompatible way, but at
this point in time it is ok to do so.

Then, we extend systemd's socket passing library to support socket naming, so
we can tell the different sockets apart. This is done via the
LISTEN_FDNAMES/FileDescriptorName mechanism.

And finally we make the server and connection types aware of the socket mode.
This commit is contained in:
Alberto Bertogli
2016-09-12 03:47:36 +01:00
parent 69222284e0
commit 941eb9315c
10 changed files with 171 additions and 91 deletions
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16
internal/config/config.proto
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@@ -11,26 +11,32 @@ message Config {
// Default: 50.
int64 max_data_size_mb = 2;
// Addresses to listen on.
// Addresses to listen on for SMTP (usually port 25).
// Default: "systemd", which means systemd passes sockets to us.
repeated string address = 3;
// systemd sockets must be named with "FileDescriptorName=smtp".
repeated string smtp_address = 3;
// Addresses to listen on for submission (usually port 587).
// Default: "systemd", which means systemd passes sockets to us.
// systemd sockets must be named with "FileDescriptorName=submission".
repeated string submission_address = 4;
// Address for the monitoring http server.
// Default: no monitoring http server.
string monitoring_address = 4;
string monitoring_address = 5;
// Mail delivery agent (MDA, also known as LDA) to use.
// This should point to the binary to use to deliver email to local users.
// The content of the email will be passed via stdin.
// If it exits unsuccessfully, we assume the mail was not delivered.
// Default: "procmail".
string mail_delivery_agent_bin = 5;
string mail_delivery_agent_bin = 6;
// Command line arguments for the mail delivery agent. One per argument.
// Some replacements will be done:
// - "%user%" -> local user (anything before the @)
// - "%domain%" -> domain (anything after the @)
// Default: "-d", "%user" (adequate for procmail)
repeated string mail_delivery_agent_args = 6;
repeated string mail_delivery_agent_args = 7;
}