diff options
Diffstat (limited to 'src/lib/dhcp/iface_mgr_bsd.cc')
| -rw-r--r-- | src/lib/dhcp/iface_mgr_bsd.cc | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/src/lib/dhcp/iface_mgr_bsd.cc b/src/lib/dhcp/iface_mgr_bsd.cc new file mode 100644 index 0000000..4ae0f0e --- /dev/null +++ b/src/lib/dhcp/iface_mgr_bsd.cc @@ -0,0 +1,200 @@ +// Copyright (C) 2011-2023 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 <sys/socket.h> +#include <net/if_dl.h> +#include <net/if.h> +#include <ifaddrs.h> + +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 (IfaceLst::const_iterator iface_iter = ifaces.begin(); + iface_iter != ifaces.end(); ++iface_iter) { + IfacePtr iface; + if (update_only) { + iface = getIface(iface_iter->first); + } + if (!iface) { + addInterface(iface_iter->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 |