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// Copyright (C) 2014 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#include <dhcp/iface_mgr.h>
#include <dhcpsrv/dhcpsrv_log.h>
#include <dhcpsrv/cfg_iface.h>
#include <util/strutil.h>
#include <boost/bind.hpp>
using namespace isc::asiolink;
namespace isc {
namespace dhcp {
const char* CfgIface::ALL_IFACES_KEYWORD = "*";
CfgIface::CfgIface()
: wildcard_used_(false) {
}
void
CfgIface::closeSockets() const {
IfaceMgr::instance().closeSockets();
}
bool
CfgIface::equals(const CfgIface& other) const {
return (iface_set_ == other.iface_set_ &&
unicast_map_ == other.unicast_map_ &&
wildcard_used_ == other.wildcard_used_);
}
void
CfgIface::openSockets(const uint16_t family, const uint16_t port,
const bool use_bcast) const {
// If wildcard interface '*' was not specified, set all interfaces to
// inactive state. We will later enable them selectively using the
// interface names specified by the user. If wildcard interface was
// specified, mark all interfaces active. In all cases, mark loopback
// inactive.
setState(family, !wildcard_used_, true);
// Remove selection of unicast addresses from all interfaces.
IfaceMgr::instance().clearUnicasts();
// If there is no wildcard interface specified, we will have to iterate
// over the names specified by the caller and enable them.
if (!wildcard_used_) {
for (IfaceSet::const_iterator iface_name = iface_set_.begin();
iface_name != iface_set_.end(); ++iface_name) {
Iface* iface = IfaceMgr::instance().getIface(*iface_name);
// This shouldn't really happen because we are checking the
// names of interfaces when they are being added (use()
// function). But, if someone has triggered detection of
// interfaces since then, some interfaces may have disappeared.
if (iface == NULL) {
isc_throw(Unexpected,
"fail to open socket on interface '"
<< *iface_name << "' as this interface doesn't"
" exist");
} else if (family == AF_INET) {
iface->inactive4_ = false;
} else {
iface->inactive6_ = false;
}
}
}
// Select unicast sockets. It works only for V6. Ignore for V4.
if (family == AF_INET6) {
for (UnicastMap::const_iterator unicast = unicast_map_.begin();
unicast != unicast_map_.end(); ++unicast) {
Iface* iface = IfaceMgr::instance().getIface(unicast->first);
if (iface == NULL) {
isc_throw(Unexpected,
"fail to open unicast socket on interface '"
<< unicast->first << "' as this interface doesn't"
" exist");
}
iface->addUnicast(unicast->second);
iface->inactive6_ = false;
}
}
// Before opening any sockets, close existing ones.
closeSockets();
// Set the callback which is called when the socket fails to open
// for some specific interface. This callback will simply log a
// warning message.
IfaceMgrErrorMsgCallback error_callback =
boost::bind(&CfgIface::socketOpenErrorHandler, _1);
bool sopen;
if (family == AF_INET) {
sopen = IfaceMgr::instance().openSockets4(port, use_bcast,
error_callback);
} else {
// use_bcast is ignored for V6.
sopen = IfaceMgr::instance().openSockets6(port, error_callback);
}
// If no socket were opened, log a warning because the server will
// not respond to any queries.
if (!sopen) {
LOG_WARN(dhcpsrv_logger, DHCPSRV_NO_SOCKETS_OPEN);
}
}
void
CfgIface::reset() {
wildcard_used_ = false;
iface_set_.clear();
}
void
CfgIface::setState(const uint16_t family, const bool inactive,
const bool loopback_inactive) const {
IfaceMgr::IfaceCollection ifaces = IfaceMgr::instance().getIfaces();
for (IfaceMgr::IfaceCollection::iterator iface = ifaces.begin();
iface != ifaces.end(); ++iface) {
Iface* iface_ptr = IfaceMgr::instance().getIface(iface->getName());
if (family == AF_INET) {
iface_ptr->inactive4_ = iface_ptr->flag_loopback_ ?
loopback_inactive : inactive;
} else {
iface_ptr->inactive6_ = iface_ptr->flag_loopback_ ?
loopback_inactive : inactive;
}
}
}
void
CfgIface::socketOpenErrorHandler(const std::string& errmsg) {
LOG_WARN(dhcpsrv_logger, DHCPSRV_OPEN_SOCKET_FAIL).arg(errmsg);
}
void
CfgIface::use(const uint16_t family, const std::string& iface_name) {
// The interface name specified may have two formats, e.g.:
// - eth0
// - eth0/2001:db8:1::1.
// The latter format is used to open unicast socket on the specified
// interface. Here we are detecting which format was used and we strip
// all extraneous spaces.
size_t pos = iface_name.find("/");
std::string name;
std::string addr_str;
// There is no unicast address so the whole string is an interface name.
if (pos == std::string::npos) {
name = util::str::trim(iface_name);
if (name.empty()) {
isc_throw(InvalidIfaceName,
"empty interface name used in configuration");
} if (name != ALL_IFACES_KEYWORD) {
if (IfaceMgr::instance().getIface(name) == NULL) {
isc_throw(NoSuchIface, "interface '" << name
<< "' doesn't exist in the system");
}
// If interface has already been specified.
if (iface_set_.find(name) != iface_set_.end()) {
isc_throw(DuplicateIfaceName, "interface '" << name
<< "' has already been specified");
}
// All ok, add interface.
LOG_INFO(dhcpsrv_logger, DHCPSRV_CFGMGR_ADD_IFACE)
.arg(name);
iface_set_.insert(name);
} else if (wildcard_used_) {
isc_throw(DuplicateIfaceName, "the wildcard interface '"
<< ALL_IFACES_KEYWORD << "' can only be specified once");
} else {
LOG_DEBUG(dhcpsrv_logger, DHCPSRV_DBG_TRACE,
DHCPSRV_CFGMGR_ALL_IFACES_ACTIVE);
wildcard_used_ = true;
}
} else if (family == AF_INET) {
isc_throw(InvalidIfaceName, "unicast addresses in the format of: "
"iface-name/unicast-addr_stress can only be specified for"
" IPv6 addr_stress family");
} else {
// The interface name includes the unicast addr_stress, so we split
// interface name and the unicast addr_stress to two variables.
name = util::str::trim(iface_name.substr(0, pos));
addr_str = util::str::trim(iface_name.substr(pos + 1));
// Interface name must not be empty.
if (name.empty()) {
isc_throw(InvalidIfaceName,
"empty interface name specified in the"
" interface configuration");
}
// Unicast addr_stress following the interface name must not be empty.
if (addr_str.empty()) {
isc_throw(InvalidIfaceName,
"empty unicast addr_stress specified in the interface"
<< " configuration");
}
// Interface name must not be the wildcard name.
if (name == ALL_IFACES_KEYWORD) {
isc_throw(InvalidIfaceName,
"wildcard interface name '" << ALL_IFACES_KEYWORD
<< "' must not be used in conjunction with a"
" unicast addr_stress");
}
// Interface must exist.
Iface* iface = IfaceMgr::instance().getIface(name);
if (iface == NULL) {
isc_throw(NoSuchIface, "interface '" << name
<< "' doesn't exist in the system");
}
// Convert address string. This may throw an exception if the address
// is invalid.
IOAddress addr(addr_str);
// Check that the address is a valid unicast address.
if (!addr.isV6() || addr.isV6LinkLocal() || addr.isV6Multicast()) {
isc_throw(InvalidIfaceName, "address '" << addr << "' is not"
" a valid IPv6 unicast address");
}
// There are valid cases where link local address can be specified to
// receive unicast traffic, e.g. sent by relay agent.
if (addr.isV6LinkLocal()) {
LOG_WARN(dhcpsrv_logger, DHCPSRV_CFGMGR_UNICAST_LINK_LOCAL)
.arg(addr.toText()).arg(name);
}
// Interface must have this address assigned.
if (!iface->hasAddress(addr)) {
isc_throw(NoSuchAddress,
"interface '" << name << "' doesn't have address '"
<< addr << "' assigned");
}
// Insert address and the interface to the collection of unicast
// addresses.
if (unicast_map_.find(name) != unicast_map_.end()) {
isc_throw(DuplicateIfaceName, "must not specify unicast address '"
<< addr << "' for interface '" << name << "' "
"because other unicast address has already been"
" specified for this interface");
}
LOG_INFO(dhcpsrv_logger, DHCPSRV_CFGMGR_ADD_UNICAST)
.arg(addr.toText()).arg(name);
unicast_map_.insert(std::pair<std::string, IOAddress>(name, addr));
}
}
} // end of isc::dhcp namespace
} // end of isc namespace
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