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199 | // Copyright (C) 2011-2024 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#if defined(OS_BSD)
#include <dhcp/iface_mgr.h>
#include <dhcp/iface_mgr_error_handler.h>
#include <dhcp/pkt_filter_bpf.h>
#include <dhcp/pkt_filter_inet.h>
#include <exceptions/exceptions.h>
#include <sys/types.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <sys/socket.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <net/if_dl.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <net/if.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <ifaddrs.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
using namespace std;
using namespace isc;
using namespace isc::asiolink;
using namespace isc::dhcp;
namespace isc {
namespace dhcp {
/// This is a BSD specific interface detection method.
void
IfaceMgr::detectIfaces(bool update_only) {
if (detect_callback_) {
if (!detect_callback_(update_only)) {
return;
}
}
struct ifaddrs* iflist = 0;// The whole interface list
struct ifaddrs* ifptr = 0; // The interface we're processing now
// Gets list of ifaddrs struct
if (getifaddrs(&iflist) != 0) {
isc_throw(Unexpected, "Network interfaces detection failed.");
}
typedef map<string, IfacePtr> IfaceLst;
IfaceLst::iterator iface_iter;
IfaceLst ifaces;
// First lookup for getting interfaces ...
for (ifptr = iflist; ifptr != 0; ifptr = ifptr->ifa_next) {
const char * ifname = ifptr->ifa_name;
uint ifindex = 0;
if (!(ifindex = if_nametoindex(ifname))) {
// Interface name does not have corresponding index ...
freeifaddrs(iflist);
isc_throw(Unexpected, "Interface " << ifname << " has no index");
}
iface_iter = ifaces.find(ifname);
if (iface_iter != ifaces.end()) {
continue;
}
IfacePtr iface;
if (update_only) {
iface = getIface(ifname);
}
if (!iface) {
iface.reset(new Iface(ifname, ifindex));
}
iface->setFlags(ifptr->ifa_flags);
ifaces.insert(pair<string, IfacePtr>(ifname, iface));
}
// Second lookup to get MAC and IP addresses
for (ifptr = iflist; ifptr != 0; ifptr = ifptr->ifa_next) {
iface_iter = ifaces.find(ifptr->ifa_name);
if (iface_iter == ifaces.end()) {
continue;
}
// Common byte pointer for following data
const uint8_t * ptr = 0;
if (ifptr->ifa_addr->sa_family == AF_LINK) {
// HWAddr
struct sockaddr_dl * ldata =
reinterpret_cast<struct sockaddr_dl *>(ifptr->ifa_addr);
ptr = reinterpret_cast<uint8_t *>(LLADDR(ldata));
iface_iter->second->setHWType(ldata->sdl_type);
iface_iter->second->setMac(ptr, ldata->sdl_alen);
} else if (ifptr->ifa_addr->sa_family == AF_INET6) {
// IPv6 Addr
struct sockaddr_in6 * adata =
reinterpret_cast<struct sockaddr_in6 *>(ifptr->ifa_addr);
ptr = reinterpret_cast<uint8_t *>(&adata->sin6_addr);
IOAddress a = IOAddress::fromBytes(AF_INET6, ptr);
iface_iter->second->addAddress(a);
} else {
// IPv4 Addr
struct sockaddr_in * adata =
reinterpret_cast<struct sockaddr_in *>(ifptr->ifa_addr);
ptr = reinterpret_cast<uint8_t *>(&adata->sin_addr);
IOAddress a = IOAddress::fromBytes(AF_INET, ptr);
iface_iter->second->addAddress(a);
}
}
freeifaddrs(iflist);
// Interfaces registering
for (auto const& iface_it : ifaces) {
IfacePtr iface;
if (update_only) {
iface = getIface(iface_it.first);
}
if (!iface) {
addInterface(iface_it.second);
}
}
}
/// @brief sets flag_*_ fields
///
/// Like Linux version, os specific flags
///
/// @params flags
void Iface::setFlags(uint64_t flags) {
flags_ = flags;
flag_loopback_ = flags & IFF_LOOPBACK;
flag_up_ = flags & IFF_UP;
flag_running_ = flags & IFF_RUNNING;
flag_multicast_ = flags & IFF_MULTICAST;
flag_broadcast_ = flags & IFF_BROADCAST;
}
void
IfaceMgr::setMatchingPacketFilter(const bool direct_response_desired) {
// If direct response is desired we have to use BPF. If the direct
// response is not desired we use datagram socket supported by the
// PktFilterInet class. Note however that on BSD systems binding the
// datagram socket to the device is not supported and the server would
// have no means to determine on which interface the packet has been
// received. Hence, it is discouraged to use PktFilterInet for the
// server.
if (direct_response_desired) {
setPacketFilter(PktFilterPtr(new PktFilterBPF()));
} else {
setPacketFilter(PktFilterPtr(new PktFilterInet()));
}
}
bool
IfaceMgr::openMulticastSocket(Iface& iface,
const isc::asiolink::IOAddress& addr,
const uint16_t port,
IfaceMgrErrorMsgCallback error_handler) {
try {
// This should open a socket, bind it to link-local address
// and join multicast group.
openSocket(iface.getName(), addr, port, iface.flag_multicast_);
} catch (const Exception& ex) {
IFACEMGR_ERROR(SocketConfigError, error_handler, IfacePtr(),
"Failed to open link-local socket on "
"interface " << iface.getName() << ": "
<< ex.what());
return (false);
}
return (true);
}
int
IfaceMgr::openSocket6(Iface& iface, const IOAddress& addr, uint16_t port,
const bool join_multicast) {
// On BSD, we bind the socket to in6addr_any and join multicast group
// to receive multicast traffic. So, if the multicast is requested,
// replace the address specified by the caller with the "unspecified"
// address.
IOAddress actual_address = join_multicast ? IOAddress("::") : addr;
SocketInfo info = packet_filter6_->openSocket(iface, actual_address, port,
join_multicast);
iface.addSocket(info);
return (info.sockfd_);
}
} // end of isc::dhcp namespace
} // end of dhcp namespace
#endif
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