mirage 3.2.0 · OCaml Package

Mirage combinators.

Mirage devices a set of devices and combinator to to define portable applications across all platforms that MirageOS supports.

Release 3.2.0

module Key : module type of struct include Mirage_key end

Configuration keys.

include Functoria_app.DSL

type !'d typ = 'd Functoria.typ =

| Type : 'a -> 'a typ
| Function : 'b typ * 'c typ -> ('b -> 'c) typ

val typ : 'a -> 'a typ

val (@->) : 'a typ -> 'b typ -> ('a -> 'b) typ

type job = Functoria.job

val job : job typ

type 'a impl = 'a Functoria.impl

val ($) : ('a -> 'b) impl -> 'a impl -> 'b impl

type abstract_impl = Functoria.abstract_impl =

| Abstract : 'a impl -> abstract_impl

val abstract : 'a impl -> abstract_impl

type key = Functoria_key.t

type context = Functoria_key.context

type 'a value = 'a Functoria_key.value

val if_impl : bool value -> 'a impl -> 'a impl -> 'a impl

val match_impl : 'b value -> default:'a impl -> ('b * 'a impl) list -> 'a impl

module type KEY = Functoria.KEY

type package = private Functoria.package = {

opam : string;
pin : string option;
build : bool;
ocamlfind : Astring.String.Set.t;
min : Astring.String.Set.t;
max : Astring.String.Set.t;

}

val package : 
  ?build:bool ->
  ?sublibs:string list ->
  ?ocamlfind:string list ->
  ?min:string ->
  ?max:string ->
  ?pin:string ->
  string ->
  package

val foreign : 
  ?packages:package list ->
  ?keys:key list ->
  ?deps:abstract_impl list ->
  string ->
  'a typ ->
  'a impl

module Info = Functoria.Info

class type !'ty configurable = object ... end

val impl : 'a configurable -> 'a impl

class base_configurable : object ... end

class !'a foreign : ?packages:package list -> ?keys:key list -> ?deps:abstract_impl list -> 
  string -> 'a typ -> 'a configurable

val hash : 'a impl -> int

val equal : 'a impl -> 'a impl -> bool

module ImplTbl = Functoria.ImplTbl

val explode : 
  'a impl ->
  [ `App of abstract_impl * abstract_impl
  | `If of bool value * 'a impl * 'a impl
  | `Impl of 'a configurable ]

General mirage devices

type tracing

The type for tracing.

val tracing : tracing typ

Implementation of the tracing type.

val mprof_trace : size:int -> unit -> tracing impl

Use mirage-profile to trace the unikernel. On Unix, this creates and mmaps a file called "trace.ctf". On Xen, it shares the trace buffer with dom0.

parameter size:
size of the ring buffer to use.

type qubesdb

val qubesdb : qubesdb typ

For the Qubes target, the Qubes database from which to look up * dynamic runtime configuration information.

val default_qubesdb : qubesdb impl

A default qubes database, guessed from the usual valid configurations.

Time

type time

Abstract type for timers.

val time : time typ

Implementations of the Mirage_types.TIME signature.

val default_time : time impl

The default timer implementation.

Clocks

type pclock

Abstract type for POSIX clocks.

val pclock : pclock typ

Implementations of the Mirage_types.PCLOCK signature.

val default_posix_clock : pclock impl

The default mirage-clock PCLOCK implementation.

type mclock

Abstract type for monotonic clocks

val mclock : mclock typ

Implementations of the Mirage_types.MCLOCK signature.

val default_monotonic_clock : mclock impl

The default mirage-clock MCLOCK implementation.

Log reporters

type reporter

The type for log reporters.

val reporter : reporter typ

Implementation of the log reporter type.

val default_reporter : 
  ?clock:pclock impl ->
  ?ring_size:int ->
  ?level:Logs.level ->
  unit ->
  reporter impl

default_reporter ?clock ?level () is the log reporter that prints log messages to the console, timestampted with clock. If not provided, the default clock is default_posix_clock. level is the default log threshold. It is Logs.Info if not specified.

val no_reporter : reporter impl

no_reporter disable log reporting.

Random

type random

Abstract type for random sources.

val random : random typ

Implementations of the Mirage_types.RANDOM signature.

val stdlib_random : random impl

Passthrough to the OCaml Random generator.

val nocrypto_random : random impl

Passthrough to the Fortuna PRNG implemented in nocrypto.

val default_random : random impl

Default PRNG device to be used in unikernels. It defaults to stdlib, but users can override using the Key.prng command line argument.

Consoles

type console

Abstract type for consoles.

val console : console typ

Implementations of the Mirage_types.CONSOLE signature.

val default_console : console impl

Default console implementation.

val custom_console : string -> console impl

Custom console implementation.

Memory allocation interface

type io_page

Abstract type for page-aligned buffers.

val io_page : io_page typ

Implementations of the Mirage_types.IO_PAGE signature.

val default_io_page : io_page impl

The default Io_page implementation.

Block devices

type block

Abstract type for raw block device configurations.

val block : block typ

Implementations of the Mirage_types.BLOCK signature.

val block_of_file : string -> block impl

Use the given file as a raw block device.

val block_of_xenstore_id : string -> block impl

Use the given XenStore ID (ex: /dev/xvdi1 or 51760) as a raw block device.

val ramdisk : string -> block impl

Use a ramdisk with the given name.

val generic_block : 
  ?group:string ->
  ?key:[ `XenstoreId | `BlockFile | `Ramdisk ] value ->
  string ->
  block impl

Static key/value stores

type kv_ro

Abstract type for read-only key/value store.

val kv_ro : kv_ro typ

Implementations of the Mirage_types.KV_RO signature.

val crunch : string -> kv_ro impl

Crunch a directory.

val archive : block impl -> kv_ro impl

val archive_of_files : ?dir:string -> unit -> kv_ro impl

val direct_kv_ro : string -> kv_ro impl

Direct access to the underlying filesystem as a key/value store. For Xen backends, this is equivalent to crunch.

Filesystem

type fs

Abstract type for filesystems.

val fs : fs typ

Implementations of the Mirage_types.FS signature.

val fat : block impl -> fs impl

Consider a raw block device as a FAT filesystem.

val fat_of_files : ?dir:string -> ?regexp:string -> unit -> fs impl

fat_files dir ?dir ?regexp () collects all the files matching the shell pattern regexp in the directory dir into a FAT image. By default, dir is the current working directory and regexp is *

val kv_ro_of_fs : fs impl -> kv_ro impl

Consider a filesystem implementation as a read-only key/value store.

Generic key/value stores

val generic_kv_ro : 
  ?group:string ->
  ?key:[ `Archive | `Crunch | `Direct | `Fat ] value ->
  string ->
  kv_ro impl

Generic key/value that will choose dynamically between fat, archive and crunch. To use a filesystem implementation, try kv_ro_of_fs.

If no key is provided, it uses Key.kv_ro to create a new one.

Network interfaces

type network

Abstract type for network configurations.

val network : network typ

Implementations of the Mirage_types.NETWORK signature.

val default_network : network impl

default_network is a dynamic network implementation * which attempts to do something reasonable based on the target.

val netif : ?group:string -> string -> network impl

A custom network interface. Exposes a Key.interface key.

Ethernet configuration

type ethernet

val ethernet : ethernet typ

Implementations of the Mirage_types.ETHIF signature.

val etif : network impl -> ethernet impl

ARP configuration

type arpv4

val arpv4 : arpv4 typ

Implementation of the Mirage_types.ARPV4 signature.

val arp : ?clock:mclock impl -> ?time:time impl -> ethernet impl -> arpv4 impl

val farp : ?clock:mclock impl -> ?time:time impl -> ethernet impl -> arpv4 impl

Functional ARP implementation provided by the arp library

IP configuration

Implementations of the Mirage_types.IP signature.

type v4

type v6

type 'a ip

Abstract type for IP configurations.

type ipv4 = v4 ip

type ipv6 = v6 ip

val ipv4 : ipv4 typ

The Mirage_types.IPV4 module signature.

val ipv6 : ipv6 typ

The Mirage_types.IPV6 module signature.

type ipv4_config = {

network : Ipaddr.V4.Prefix.t * Ipaddr.V4.t;
gateway : Ipaddr.V4.t option;

}

Types for IPv4 manual configuration.

type ipv6_config = {

addresses : Ipaddr.V6.t list;
netmasks : Ipaddr.V6.Prefix.t list;
gateways : Ipaddr.V6.t list;

}

Types for IP manual configuration.

val create_ipv4 : 
  ?group:string ->
  ?config:ipv4_config ->
  ?random:random impl ->
  ?clock:mclock impl ->
  ethernet impl ->
  arpv4 impl ->
  ipv4 impl

Use an IPv4 address Exposes the keys Key.V4.network and Key.V4.gateway. If provided, the values of these keys will override those supplied in the ipv4 configuration record, if that has been provided.

val ipv4_qubes : 
  ?random:random impl ->
  ?clock:mclock impl ->
  qubesdb impl ->
  ethernet impl ->
  arpv4 impl ->
  ipv4 impl

Use a given initialized QubesDB to look up and configure the appropriate * IPv4 interface.

val create_ipv6 : 
  ?random:random impl ->
  ?time:time impl ->
  ?clock:mclock impl ->
  ?group:string ->
  ethernet impl ->
  ipv6_config ->
  ipv6 impl

Use an IPv6 address. Exposes the keys Key.V6.ips, Key.V6.netmasks and Key.V6.gateways.

UDP configuration

type 'a udp

type udpv4 = v4 udp

type udpv6 = v6 udp

val udp : 'a udp typ

Implementation of the Mirage_types.UDP signature.

val udpv4 : udpv4 typ

val udpv6 : udpv6 typ

val direct_udp : ?random:random impl -> 'a ip impl -> 'a udp impl

val socket_udpv4 : ?group:string -> Ipaddr.V4.t option -> udpv4 impl

TCP configuration

type 'a tcp

type tcpv4 = v4 tcp

type tcpv6 = v6 tcp

val tcp : 'a tcp typ

Implementation of the Mirage_types.TCP signature.

val tcpv4 : tcpv4 typ

val tcpv6 : tcpv6 typ

val direct_tcp : 
  ?clock:mclock impl ->
  ?random:random impl ->
  ?time:time impl ->
  'a ip impl ->
  'a tcp impl

val socket_tcpv4 : ?group:string -> Ipaddr.V4.t option -> tcpv4 impl

Network stack configuration

type stackv4

val stackv4 : stackv4 typ

Implementation of the Mirage_types.STACKV4 signature.

val direct_stackv4 : 
  ?clock:mclock impl ->
  ?random:random impl ->
  ?time:time impl ->
  ?group:string ->
  network impl ->
  ethernet impl ->
  arpv4 impl ->
  ipv4 impl ->
  stackv4 impl

Direct network stack with given ip.

val socket_stackv4 : ?group:string -> Ipaddr.V4.t list -> stackv4 impl

Network stack with sockets. Exposes the key Key.V4.interfaces.

val qubes_ipv4_stack : 
  ?group:string ->
  ?qubesdb:qubesdb impl ->
  ?arp:(ethernet impl -> arpv4 impl) ->
  network impl ->
  stackv4 impl

Build a stackv4 by looking up configuration information via QubesDB, * building an ipv4, then building a stack on top of that.

val dhcp_ipv4_stack : 
  ?group:string ->
  ?time:time impl ->
  ?arp:(ethernet impl -> arpv4 impl) ->
  network impl ->
  stackv4 impl

Build a stackv4 by obtaining a DHCP lease, using the lease to * build an ipv4, then building a stack on top of that.

val static_ipv4_stack : 
  ?group:string ->
  ?config:ipv4_config ->
  ?arp:(ethernet impl -> arpv4 impl) ->
  network impl ->
  stackv4 impl

Build a stackv4 by checking the Key.V4.network, and Key.V4.gateway keys * for ipv4 configuration information, filling in unspecified information from ?config, * then building a stack on top of that.

val generic_stackv4 : 
  ?group:string ->
  ?config:ipv4_config ->
  ?dhcp_key:bool value ->
  ?net_key:[ `Direct | `Socket ] value ->
  network impl ->
  stackv4 impl

Generic stack using a dhcp and a net keys: Key.net and Key.dhcp.

If target = Qubes then qubes_ipv4_stack is used.
If net = socket then socket_stackv4 is used.
Else, if dhcp then dhcp_ipv4_stack is used
Else, static_ipv4_stack is used.

If a key is not provided, it uses Key.net or Key.dhcp (with the group argument) to create it.

Resolver configuration

type resolver

val resolver : resolver typ

val resolver_dns : 
  ?ns:Ipaddr.V4.t ->
  ?ns_port:int ->
  ?time:time impl ->
  stackv4 impl ->
  resolver impl

val resolver_unix_system : resolver impl

Syslog configuration

Syslog exfiltrates log messages (generated by libraries using the logs library) via a network connection. The log level of the log sources is controlled via the Mirage_key.logs key. The functionality is provided by the logs-syslog package.

type syslog_config = {

hostname : string;
server : Ipaddr.V4.t option;
port : int option;
truncate : int option;

}

val syslog_config : 
  ?port:int ->
  ?truncate:int ->
  ?server:Ipaddr.V4.t ->
  string ->
  syslog_config

Helper for constructing a syslog_config.

type syslog

The type for syslog

val syslog : syslog typ

Implementation of the syslog type.

val syslog_udp : 
  ?config:syslog_config ->
  ?console:console impl ->
  ?clock:pclock impl ->
  stackv4 impl ->
  syslog impl

Emit log messages via UDP to the configured host.

val syslog_tcp : 
  ?config:syslog_config ->
  ?console:console impl ->
  ?clock:pclock impl ->
  stackv4 impl ->
  syslog impl

Emit log messages via TCP to the configured host.

val syslog_tls : 
  ?config:syslog_config ->
  ?keyname:string ->
  ?console:console impl ->
  ?clock:pclock impl ->
  stackv4 impl ->
  kv_ro impl ->
  syslog impl

Emit log messages via TLS to the configured host, using the credentials (private ekey, certificate, trust anchor) provided in the KV_RO using the keyname.

Entropy

val nocrypto : job impl

Device that initializes the entropy.

Conduit configuration

type conduit

val conduit : conduit typ

val conduit_direct : ?tls:bool -> stackv4 impl -> conduit impl

HTTP configuration

type http

val http : http typ

val http_server : conduit impl -> http impl

Argv configuration

val default_argv : Functoria_app.argv impl

default_argv is a dynamic argv implementation * which attempts to do something reasonable based on the target.

val no_argv : Functoria_app.argv impl

no_argv Disable command line parsing and set argv to |""|.

Other devices

val noop : job impl

noop is a job that does nothing, has no dependency and returns ()

type info

info is the type for module implementing Mirage_runtime.Info.

val info : info typ

info is the combinator to generate info values to use at runtime.

val app_info : info impl

app_info exports all the information available at configure time into a runtime Mirage.Info.t value.

Application registering

val register : 
  ?argv:Functoria_app.argv impl ->
  ?tracing:tracing impl ->
  ?reporter:reporter impl ->
  ?keys:Key.t list ->
  ?packages:Functoria.package list ->
  string ->
  job impl list ->
  unit

register name jobs registers the application named by name which will executes the given jobs.

parameter packages
The opam packages needed by this module.

parameter keys
The keys related to this module.

parameter tracing
Enable tracing.

parameter reporter
Configure logging. The default log reporter is default_reporter. To disable logging, use no_reporter.

parameter argv
Configure command-line argument parsing. The default parser is default_argv. To disable command-line parsing, use no_argv.

package mirage