"""
Management of firewalld

.. versionadded:: 2015.8.0

The following example applies changes to the public zone, blocks echo-reply
and echo-request packets, does not set the zone to be the default, enables
masquerading, and allows ports 22/tcp and 25/tcp.
It will be applied permanently and directly before restart/reload.

.. code-block:: yaml

    public:
      firewalld.present:
        - name: public
        - block_icmp:
          - echo-reply
          - echo-request
        - default: False
        - masquerade: True
        - ports:
          - 22/tcp
          - 25/tcp

The following example applies changes to the public zone, enables
masquerading and configures port forwarding TCP traffic from port 22
to 2222, and forwards TCP traffic from port 80 to 443 at 192.168.0.1.

.. code-block:: yaml

  my_zone:
    firewalld.present:
      - name: public
      - masquerade: True
      - port_fwd:
        - 22:2222:tcp
        - 80:443:tcp:192.168.0.1

The following example binds the public zone to interface eth0 and to all
packets coming from the 192.168.1.0/24 subnet. It also removes the zone
from all other interfaces or sources.

.. code-block:: yaml

  public:
    firewalld.present:
      - name: public
      - interfaces:
        - eth0
      - sources:
        - 192.168.1.0/24

Here, we define a new service that encompasses TCP ports 4505 4506:

.. code-block:: yaml

  saltmaster:
    firewalld.service:
      - name: saltmaster
      - ports:
        - 4505/tcp
        - 4506/tcp

To make this new service available in a zone, the following can be used, which
would allow access to the salt master from the 10.0.0.0/8 subnet:

.. code-block:: yaml

  saltzone:
    firewalld.present:
      - name: saltzone
      - services:
        - saltmaster
      - sources:
        - 10.0.0.0/8

Another way of implementing the same rule above using rich rules is demonstrated
here:

.. code-block:: yaml

  saltzone:
    firewalld.present:
      - name: saltzone
      - rich_rules:
        - rule service name="saltmaster" accept
      - sources:
        - 10.0.0.0/8

The format of rich rules is the same as:

.. code-block:: shell

  firewall-cmd --list-rich-rules

with an example output of:

.. code-block:: text

  rule protocol value="icmp" accept
  rule protocol value="ipv6-icmp" accept
  rule service name="snmp" accept
"""


import logging

import salt.utils.path
from salt.exceptions import CommandExecutionError
from salt.output import nested

log = logging.getLogger(__name__)


class ForwardingMapping:
    """
    Represents a port forwarding statement mapping a local port to a remote
    port for a specific protocol (TCP or UDP)
    """

    def __init__(self, srcport, destport, protocol, destaddr):
        self.srcport = srcport
        self.destport = destport
        self.protocol = protocol
        self.destaddr = destaddr

    def __eq__(self, other):
        return (
            self.srcport == other.srcport
            and self.destport == other.destport
            and self.protocol == other.protocol
            and self.destaddr == other.destaddr
        )

    def __ne__(self, other):
        return not self.__eq__(other)

    # hash is needed for set operations
    def __hash__(self):
        return (
            hash(self.srcport)
            ^ hash(self.destport)
            ^ hash(self.protocol)
            ^ hash(self.destaddr)
        )

    def todict(self):
        """
        Returns a pretty dictionary meant for command line output.
        """
        return {
            "Source port": self.srcport,
            "Destination port": self.destport,
            "Protocol": self.protocol,
            "Destination address": self.destaddr,
        }


def _parse_forward(mapping):
    """
    Parses a port forwarding statement in the form used by this state:

    from_port:to_port:protocol[:destination]

    and returns a ForwardingMapping object
    """
    if len(mapping.split(":")) > 3:
        (srcport, destport, protocol, destaddr) = mapping.split(":")
    else:
        (srcport, destport, protocol) = mapping.split(":")
        destaddr = ""
    return ForwardingMapping(srcport, destport, protocol, destaddr)


def __virtual__():
    """
    Ensure the firewall-cmd is available
    """
    if salt.utils.path.which("firewall-cmd"):
        return True

    return (
        False,
        "firewall-cmd is not available, firewalld is probably not installed.",
    )


def present(
    name,
    block_icmp=None,
    prune_block_icmp=False,
    default=None,
    masquerade=False,
    ports=None,
    prune_ports=False,
    port_fwd=None,
    prune_port_fwd=False,
    services=None,
    prune_services=False,
    interfaces=None,
    prune_interfaces=False,
    sources=None,
    prune_sources=False,
    rich_rules=None,
    prune_rich_rules=False,
):

    """
    Ensure a zone has specific attributes.

    name
        The zone to modify.

    default : None
        Set this zone as the default zone if ``True``.

    masquerade : False
        Enable or disable masquerade for a zone.

    block_icmp : None
        List of ICMP types to block in the zone.

    prune_block_icmp : False
        If ``True``, remove all but the specified block_icmp from the zone.

    ports : None
        List of ports to add to the zone.

    prune_ports : False
        If ``True``, remove all but the specified ports from the zone.

    port_fwd : None
        List of port forwards to add to the zone.

    prune_port_fwd : False
        If ``True``, remove all but the specified port_fwd from the zone.

    services : None
        List of services to add to the zone.

    prune_services : False
        If ``True``, remove all but the specified services from the zone.
        .. note:: Currently defaults to True for compatibility, but will be changed to False in a future release.

    interfaces : None
        List of interfaces to add to the zone.

    prune_interfaces : False
        If ``True``, remove all but the specified interfaces from the zone.

    sources : None
        List of sources to add to the zone.

    prune_sources : False
        If ``True``, remove all but the specified sources from the zone.

    rich_rules : None
        List of rich rules to add to the zone.

    prune_rich_rules : False
        If ``True``, remove all but the specified rich rules from the zone.
    """
    ret = _present(
        name,
        block_icmp,
        prune_block_icmp,
        default,
        masquerade,
        ports,
        prune_ports,
        port_fwd,
        prune_port_fwd,
        services,
        prune_services,
        interfaces,
        prune_interfaces,
        sources,
        prune_sources,
        rich_rules,
        prune_rich_rules,
    )

    # Reload firewalld service on changes
    if ret["changes"] != {}:
        __salt__["firewalld.reload_rules"]()

    return ret


def service(name, ports=None, protocols=None):
    """
    Ensure the service exists and encompasses the specified ports and
    protocols.

    .. versionadded:: 2016.11.0
    """
    ret = {"name": name, "result": False, "changes": {}, "comment": ""}

    if name not in __salt__["firewalld.get_services"]():
        __salt__["firewalld.new_service"](name, restart=False)

    ports = ports or []

    try:
        _current_ports = __salt__["firewalld.get_service_ports"](name)
    except CommandExecutionError as err:
        ret["comment"] = "Error: {}".format(err)
        return ret

    new_ports = set(ports) - set(_current_ports)
    old_ports = set(_current_ports) - set(ports)

    for port in new_ports:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.add_service_port"](name, port)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret

    for port in old_ports:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.remove_service_port"](name, port)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret

    if new_ports or old_ports:
        ret["changes"].update({"ports": {"old": _current_ports, "new": ports}})

    protocols = protocols or []

    try:
        _current_protocols = __salt__["firewalld.get_service_protocols"](name)
    except CommandExecutionError as err:
        ret["comment"] = "Error: {}".format(err)
        return ret

    new_protocols = set(protocols) - set(_current_protocols)
    old_protocols = set(_current_protocols) - set(protocols)

    for protocol in new_protocols:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.add_service_protocol"](name, protocol)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret

    for protocol in old_protocols:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.remove_service_protocol"](name, protocol)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret

    if new_protocols or old_protocols:
        ret["changes"].update(
            {"protocols": {"old": _current_protocols, "new": protocols}}
        )

    if ret["changes"] != {}:
        __salt__["firewalld.reload_rules"]()

    ret["result"] = True
    if ret["changes"] == {}:
        ret["comment"] = "'{}' is already in the desired state.".format(name)
        return ret

    if __opts__["test"]:
        ret["result"] = None
        ret["comment"] = "Configuration for '{}' will change.".format(name)
        return ret

    ret["comment"] = "'{}' was configured.".format(name)
    return ret


def _present(
    name,
    block_icmp=None,
    prune_block_icmp=False,
    default=None,
    masquerade=False,
    ports=None,
    prune_ports=False,
    port_fwd=None,
    prune_port_fwd=False,
    services=None,
    # TODO: prune_services=False in future release
    # prune_services=False,
    prune_services=None,
    interfaces=None,
    prune_interfaces=False,
    sources=None,
    prune_sources=False,
    rich_rules=None,
    prune_rich_rules=False,
):
    """
    Ensure a zone has specific attributes.
    """
    ret = {"name": name, "result": False, "changes": {}, "comment": ""}

    try:
        zones = __salt__["firewalld.get_zones"](permanent=True)
    except CommandExecutionError as err:
        ret["comment"] = "Error: {}".format(err)
        return ret

    if name not in zones:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.new_zone"](name)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret

        ret["changes"].update({name: {"old": zones, "new": name}})

    if block_icmp or prune_block_icmp:
        block_icmp = block_icmp or []
        new_icmp_types = []
        old_icmp_types = []

        try:
            _current_icmp_blocks = __salt__["firewalld.list_icmp_block"](
                name, permanent=True
            )
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        if block_icmp:
            try:
                _valid_icmp_types = __salt__["firewalld.get_icmp_types"](permanent=True)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret

            # log errors for invalid ICMP types in block_icmp input
            for icmp_type in set(block_icmp) - set(_valid_icmp_types):
                log.error("%s is an invalid ICMP type", icmp_type)
                block_icmp.remove(icmp_type)

            new_icmp_types = set(block_icmp) - set(_current_icmp_blocks)
            for icmp_type in new_icmp_types:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.block_icmp"](
                            name, icmp_type, permanent=True
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if prune_block_icmp:
            old_icmp_types = set(_current_icmp_blocks) - set(block_icmp)
            for icmp_type in old_icmp_types:
                # no need to check against _valid_icmp_types here, because all
                # elements in old_icmp_types are guaranteed to be in
                # _current_icmp_blocks, whose elements are inherently valid
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.allow_icmp"](
                            name, icmp_type, permanent=True
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_icmp_types or old_icmp_types:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_block_icmp:
                block_icmp = list(new_icmp_types | set(_current_icmp_blocks))
            ret["changes"].update(
                {"icmp_types": {"old": _current_icmp_blocks, "new": block_icmp}}
            )

    # that's the only parameter that can't be permanent or runtime, it's
    # directly both
    if default:
        try:
            default_zone = __salt__["firewalld.default_zone"]()
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret
        if name != default_zone:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.set_default_zone"](name)
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret
            ret["changes"].update({"default": {"old": default_zone, "new": name}})

    try:
        masquerade_ret = __salt__["firewalld.get_masquerade"](name, permanent=True)
    except CommandExecutionError as err:
        ret["comment"] = "Error: {}".format(err)
        return ret

    if masquerade and not masquerade_ret:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.add_masquerade"](name, permanent=True)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret
        ret["changes"].update(
            {"masquerade": {"old": "", "new": "Masquerading successfully set."}}
        )
    elif not masquerade and masquerade_ret:
        if not __opts__["test"]:
            try:
                __salt__["firewalld.remove_masquerade"](name, permanent=True)
            except CommandExecutionError as err:
                ret["comment"] = "Error: {}".format(err)
                return ret
        ret["changes"].update(
            {"masquerade": {"old": "", "new": "Masquerading successfully disabled."}}
        )

    if ports or prune_ports:
        ports = ports or []
        try:
            _current_ports = __salt__["firewalld.list_ports"](name, permanent=True)
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        new_ports = set(ports) - set(_current_ports)
        old_ports = []

        for port in new_ports:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.add_port"](
                        name, port, permanent=True, force_masquerade=False
                    )
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret

        if prune_ports:
            old_ports = set(_current_ports) - set(ports)
            for port in old_ports:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.remove_port"](name, port, permanent=True)
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_ports or old_ports:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_ports:
                ports = list(new_ports | set(_current_ports))
            ret["changes"].update({"ports": {"old": _current_ports, "new": ports}})

    if port_fwd or prune_port_fwd:
        port_fwd = port_fwd or []
        try:
            _current_port_fwd = __salt__["firewalld.list_port_fwd"](
                name, permanent=True
            )
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        port_fwd = [_parse_forward(fwd) for fwd in port_fwd]
        _current_port_fwd = [
            ForwardingMapping(
                srcport=fwd["Source port"],
                destport=fwd["Destination port"],
                protocol=fwd["Protocol"],
                destaddr=fwd["Destination address"],
            )
            for fwd in _current_port_fwd
        ]

        new_port_fwd = set(port_fwd) - set(_current_port_fwd)
        old_port_fwd = []

        for fwd in new_port_fwd:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.add_port_fwd"](
                        name,
                        fwd.srcport,
                        fwd.destport,
                        fwd.protocol,
                        fwd.destaddr,
                        permanent=True,
                        force_masquerade=False,
                    )
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret

        if prune_port_fwd:
            old_port_fwd = set(_current_port_fwd) - set(port_fwd)
            for fwd in old_port_fwd:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.remove_port_fwd"](
                            name,
                            fwd.srcport,
                            fwd.destport,
                            fwd.protocol,
                            fwd.destaddr,
                            permanent=True,
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_port_fwd or old_port_fwd:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_port_fwd:
                port_fwd = list(new_port_fwd | set(_current_port_fwd))
            ret["changes"].update(
                {
                    "port_fwd": {
                        "old": [fwd.todict() for fwd in _current_port_fwd],
                        "new": [fwd.todict() for fwd in port_fwd],
                    }
                }
            )

    if services or prune_services:
        services = services or []
        try:
            _current_services = __salt__["firewalld.list_services"](
                name, permanent=True
            )
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        new_services = set(services) - set(_current_services)
        old_services = []

        for new_service in new_services:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.add_service"](new_service, name, permanent=True)
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret

        if prune_services:
            old_services = set(_current_services) - set(services)
            for old_service in old_services:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.remove_service"](
                            old_service, name, permanent=True
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_services or old_services:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_services:
                services = list(new_services | set(_current_services))
            ret["changes"].update(
                {"services": {"old": _current_services, "new": services}}
            )

    if interfaces or prune_interfaces:
        interfaces = interfaces or []
        try:
            _current_interfaces = __salt__["firewalld.get_interfaces"](
                name, permanent=True
            )
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        new_interfaces = set(interfaces) - set(_current_interfaces)
        old_interfaces = []

        for interface in new_interfaces:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.add_interface"](name, interface, permanent=True)
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret

        if prune_interfaces:
            old_interfaces = set(_current_interfaces) - set(interfaces)
            for interface in old_interfaces:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.remove_interface"](
                            name, interface, permanent=True
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_interfaces or old_interfaces:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_interfaces:
                interfaces = list(new_interfaces | set(_current_interfaces))
            ret["changes"].update(
                {"interfaces": {"old": _current_interfaces, "new": interfaces}}
            )

    if sources or prune_sources:
        sources = sources or []
        try:
            _current_sources = __salt__["firewalld.get_sources"](name, permanent=True)
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        new_sources = set(sources) - set(_current_sources)
        old_sources = []

        for source in new_sources:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.add_source"](name, source, permanent=True)
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret

        if prune_sources:
            old_sources = set(_current_sources) - set(sources)
            for source in old_sources:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.remove_source"](
                            name, source, permanent=True
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_sources or old_sources:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_sources:
                sources = list(new_sources | set(_current_sources))
            ret["changes"].update(
                {"sources": {"old": _current_sources, "new": sources}}
            )

    if rich_rules or prune_rich_rules:
        rich_rules = rich_rules or []
        try:
            _current_rich_rules = __salt__["firewalld.get_rich_rules"](
                name, permanent=True
            )
        except CommandExecutionError as err:
            ret["comment"] = "Error: {}".format(err)
            return ret

        new_rich_rules = set(rich_rules) - set(_current_rich_rules)
        old_rich_rules = []

        for rich_rule in new_rich_rules:
            if not __opts__["test"]:
                try:
                    __salt__["firewalld.add_rich_rule"](name, rich_rule, permanent=True)
                except CommandExecutionError as err:
                    ret["comment"] = "Error: {}".format(err)
                    return ret

        if prune_rich_rules:
            old_rich_rules = set(_current_rich_rules) - set(rich_rules)
            for rich_rule in old_rich_rules:
                if not __opts__["test"]:
                    try:
                        __salt__["firewalld.remove_rich_rule"](
                            name, rich_rule, permanent=True
                        )
                    except CommandExecutionError as err:
                        ret["comment"] = "Error: {}".format(err)
                        return ret

        if new_rich_rules or old_rich_rules:
            # If we're not pruning, include current items in new output so it's clear
            # that they're still present
            if not prune_rich_rules:
                rich_rules = list(new_rich_rules | set(_current_rich_rules))
            ret["changes"].update(
                {"rich_rules": {"old": _current_rich_rules, "new": rich_rules}}
            )

    # No changes
    if ret["changes"] == {}:
        ret["result"] = True
        ret["comment"] = "'{}' is already in the desired state.".format(name)
        return ret

    # test=True and changes predicted
    if __opts__["test"]:
        ret["result"] = None
        # build comment string
        nested.__opts__ = __opts__
        comment = []
        comment.append("Configuration for '{}' will change:".format(name))
        comment.append(nested.output(ret["changes"]).rstrip())
        ret["comment"] = "\n".join(comment)
        ret["changes"] = {}
        return ret

    # Changes were made successfully
    ret["result"] = True
    ret["comment"] = "'{}' was configured.".format(name)
    return ret
