zcore

Name

zcore — Bridge for PHP-MAPI requests

Synopsis

zcore [-c config]

Description

zcore is a bridge process (proxy) between mapi(4gx) and exmdb_provider(4gx). It listens on /run/gromox/zcore.sock (hardcoded) for zcore RPCs, a Gromox-specific protocol and issues exmdb RPCs to exmdb_provider(4gx). As exmdb_provider connections have no state to speak of, zcore is the process that defines the logins sessions. zcore needs to run on the same server as the program that uses the Z-MAPI PHP functions.

Options

-c config: Read configuration directives from the given file. If this option is not specified, /etc/gromox/zcore.cfg will be read if it exists.
--version: Output version information and exit.
-?: Display option summary.

All time-based command-line options and configuration file directives are subject to the syntax described in gromox(7), section "Duration specifications".

Configuration directives (gromox.cfg)

The following directives are recognized when reading from /etc/gromox/gromox.cfg, or when the -c option is used to specify a custom file:

daemons_fd_limit: In gromox-zcore, this is treated as an alias for zcore_fd_limit.
outgoing_smtp_url: The SMTP server to use for outgoing mails. To use the local maildrop queue, set the value to sendmail://localhost. smtp:// is unqueued(!), and if the SMTP server is offline, submissions will be rejected (and mails stick around in Outbox or whatever folder they were submitted from).

Default: sendmail://localhost
zcore_fd_limit: Request that the file descriptor table be at least this large. The magic value 0 indicates that the system default hard limit (rlim_max, cf. setrlimit(2)) should be used.

Default: 0

Configuration directives (zcore.cfg)

The following directives are recognized when reading from /etc/gromox/zcore.cfg, or when the -c option is used to specify a custom file:

address_cache_interval: Default: 5 minutes
address_table_size: Default: 3000
config_file_path: Colon-separated list of directories which will be scanned when locating further configuration files, especially those used by plugin instances.

Default: /etc/gromox/zcore:/etc/gromox
data_file_path: Colon-separated list of directories which will be scanned when locating data files.

Default: /usr/share/gromox/zcore
default_charset: Default: utf-8
host_id: A unique identifier for this system. It is used for the HELO line of outgoing SMTP connections, and as an unused identifier within muidStoreWrap entryids. The identifier should only use characters allowed for hostnames.

Default: (system hostname)
mailbox_ping_interval: Default: 5 minutes
mail_max_length: Default: 64M
max_ext_rule_length: Default: 510K
max_mail_num: Default: 1000000
max_rcpt_num: The maximum number of recipients that an e-mail is allowed to have.

Default: 256
notify_stub_threads_num: For every exmdb server in exmdb_list.txt, establish and keep this many number of outbound connections for receiving notification RPCs.

Default: 10
rpc_proxy_connection_num: For every exmdb server in exmdb_list.txt, establish and keep this many number of outbound connections for sending commands.

Default: 10
submit_command: Default: /usr/bin/php /usr/share/gromox/sa/submit.php
user_cache_interval: Sets the time how long the MAPI profile is cached before it is written to disk.

Default: 1 hour
user_table_size: Default: 5000
x500_org_name: Default: (unspecified)
zcore_listen: The named path for the AF_LOCAL socket that zcore will listen on.

Default: /run/gromox/zcore.sock
zcore_log_file: Target for log messages here. Special values: "-" (stderr/syslog depending on parent PID) or "syslog" are recognized.

Default: - (auto)
zcore_log_level: Maximum verbosity of logging. 1=crit, 2=error, 3=warn, 4=notice, 5=info, 6=debug.

Default: 4 (notice)
zcore_max_obh_per_session: The maximum number of object handles each session can have at any one time (e.g. folders/messages/etc. open simultaneously). Use 0 to indicate unlimited. There is one session for each time a mailbox is opened.

Default: 500
zcore_threads_num: The minimum number of client processing threads to keep around.

Default: 10
zrpc_debug: Log every incoming zcore RPC and the return code of the operation in a minimal fashion to stdout. Level 1 emits RPCs with a failure return code, level 2 emits all RPCs. Note the daemon log level needs to be "debug" (6), too.

Default: 0

Network protocol

The transmissions on the zcore socket are simple concatenations of protocol data units built using the NDR format. The PDU length is present within the PDU itself near the start.

{
     leuint32_t length;
     char pdu[];
}

pdu := {
     uint8_t call_id;
     string directory;
     switch (call_id) {
             ...
     }
}

Store lookup

zcore determines the store path for a user from the user database, which may be provided by a service plugin like mysql_adaptor(4gx).

The filemap that specifies how paths are handled is located at data_file_path/exmdb_list.txt, whereby data_file_path is the eponymous directive from the config file.

Each line in this file consists of 4 columns separated by whitespace:

A portion of the store path to match on
The type of store ("private" or "public")
The IPv6 socket address of the server running exmdb_provider(4gx). The address must conform to gromox(7) c "Host addresses".
The TCP port number of the server

Files

config_file_path/exmdb_list.txt: exmdb multiserver selection map, see exmdb_provider(4gx) for details.
data_file_path/folder_names.txt: Translations for essential folders in a message store.
data_file_path/msgchg_grouping/: Data files for exchange_emsmdb(4gx)
data_file_path/notify_bounce/: templates for read/nonread notification mails sent to originators
/usr/lib/gromox/libgxs_*.so: service plugins

Notes

Behavior for the address book generally mirrors exchange_nsp(4gx), so see that manpage for additional notes.