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725 lines
19 KiB
725 lines
19 KiB
/*
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* Perform PPPoE discovery
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*
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* Copyright (C) 2000-2001 by Roaring Penguin Software Inc.
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* Copyright (C) 2004 Marco d'Itri <md@linux.it>
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*
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* This program may be distributed according to the terms of the GNU
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* General Public License, version 2 or (at your option) any later version.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include "pppoe.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_NETPACKET_PACKET_H
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#include <netpacket/packet.h>
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#elif defined(HAVE_LINUX_IF_PACKET_H)
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#include <linux/if_packet.h>
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#endif
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#ifdef HAVE_NET_ETHERNET_H
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#include <net/ethernet.h>
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#endif
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#ifdef HAVE_ASM_TYPES_H
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#include <asm/types.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_NET_IF_ARP_H
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#include <net/if_arp.h>
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#endif
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char *xstrdup(const char *s);
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void usage(void);
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void die(int status)
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{
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exit(status);
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}
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/* Initialize frame types to RFC 2516 values. Some broken peers apparently
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use different frame types... sigh... */
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UINT16_t Eth_PPPOE_Discovery = ETH_PPPOE_DISCOVERY;
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UINT16_t Eth_PPPOE_Session = ETH_PPPOE_SESSION;
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/**********************************************************************
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*%FUNCTION: etherType
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*%ARGUMENTS:
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* packet -- a received PPPoE packet
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*%RETURNS:
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* ethernet packet type (see /usr/include/net/ethertypes.h)
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*%DESCRIPTION:
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* Checks the ethernet packet header to determine its type.
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* We should only be receveing DISCOVERY and SESSION types if the BPF
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* is set up correctly. Logs an error if an unexpected type is received.
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* Note that the ethernet type names come from "pppoe.h" and the packet
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* packet structure names use the LINUX dialect to maintain consistency
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* with the rest of this file. See the BSD section of "pppoe.h" for
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* translations of the data structure names.
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***********************************************************************/
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UINT16_t
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etherType(PPPoEPacket *packet)
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{
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UINT16_t type = (UINT16_t) ntohs(packet->ethHdr.h_proto);
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if (type != Eth_PPPOE_Discovery && type != Eth_PPPOE_Session) {
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fprintf(stderr, "Invalid ether type 0x%x\n", type);
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}
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return type;
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}
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/**********************************************************************
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*%FUNCTION: openInterface
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*%ARGUMENTS:
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* ifname -- name of interface
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* type -- Ethernet frame type
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* hwaddr -- if non-NULL, set to the hardware address
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*%RETURNS:
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* A raw socket for talking to the Ethernet card. Exits on error.
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*%DESCRIPTION:
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* Opens a raw Ethernet socket
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***********************************************************************/
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int
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openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr)
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{
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int optval=1;
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int fd;
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struct ifreq ifr;
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int domain, stype;
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#ifdef HAVE_STRUCT_SOCKADDR_LL
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struct sockaddr_ll sa;
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#else
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struct sockaddr sa;
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#endif
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memset(&sa, 0, sizeof(sa));
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#ifdef HAVE_STRUCT_SOCKADDR_LL
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domain = PF_PACKET;
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stype = SOCK_RAW;
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#else
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domain = PF_INET;
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stype = SOCK_PACKET;
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#endif
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if ((fd = socket(domain, stype, htons(type))) < 0) {
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/* Give a more helpful message for the common error case */
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if (errno == EPERM) {
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rp_fatal("Cannot create raw socket -- pppoe must be run as root.");
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}
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fatalSys("socket");
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}
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if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(optval)) < 0) {
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fatalSys("setsockopt");
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}
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/* Fill in hardware address */
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if (hwaddr) {
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strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
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fatalSys("ioctl(SIOCGIFHWADDR)");
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}
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memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
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#ifdef ARPHRD_ETHER
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if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
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char buffer[256];
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sprintf(buffer, "Interface %.16s is not Ethernet", ifname);
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rp_fatal(buffer);
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}
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#endif
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if (NOT_UNICAST(hwaddr)) {
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char buffer[256];
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sprintf(buffer,
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"Interface %.16s has broadcast/multicast MAC address??",
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ifname);
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rp_fatal(buffer);
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}
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}
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/* Sanity check on MTU */
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strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
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fatalSys("ioctl(SIOCGIFMTU)");
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}
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if (ifr.ifr_mtu < ETH_DATA_LEN) {
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fprintf(stderr, "Interface %.16s has MTU of %d -- should be %d.\n",
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ifname, ifr.ifr_mtu, ETH_DATA_LEN);
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fprintf(stderr, "You may have serious connection problems.\n");
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}
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#ifdef HAVE_STRUCT_SOCKADDR_LL
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/* Get interface index */
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sa.sll_family = AF_PACKET;
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sa.sll_protocol = htons(type);
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strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
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fatalSys("ioctl(SIOCFIGINDEX): Could not get interface index");
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}
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sa.sll_ifindex = ifr.ifr_ifindex;
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#else
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strcpy(sa.sa_data, ifname);
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#endif
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/* We're only interested in packets on specified interface */
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if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
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fatalSys("bind");
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}
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return fd;
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}
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/***********************************************************************
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*%FUNCTION: sendPacket
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*%ARGUMENTS:
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* sock -- socket to send to
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* pkt -- the packet to transmit
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* size -- size of packet (in bytes)
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*%RETURNS:
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* 0 on success; -1 on failure
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*%DESCRIPTION:
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* Transmits a packet
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***********************************************************************/
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int
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sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size)
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{
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#if defined(HAVE_STRUCT_SOCKADDR_LL)
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if (send(sock, pkt, size, 0) < 0) {
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sysErr("send (sendPacket)");
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return -1;
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}
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#else
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struct sockaddr sa;
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if (!conn) {
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rp_fatal("relay and server not supported on Linux 2.0 kernels");
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}
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strcpy(sa.sa_data, conn->ifName);
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if (sendto(sock, pkt, size, 0, &sa, sizeof(sa)) < 0) {
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sysErr("sendto (sendPacket)");
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return -1;
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}
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#endif
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return 0;
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}
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/***********************************************************************
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*%FUNCTION: receivePacket
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*%ARGUMENTS:
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* sock -- socket to read from
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* pkt -- place to store the received packet
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* size -- set to size of packet in bytes
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*%RETURNS:
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* >= 0 if all OK; < 0 if error
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*%DESCRIPTION:
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* Receives a packet
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***********************************************************************/
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int
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receivePacket(int sock, PPPoEPacket *pkt, int *size)
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{
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if ((*size = recv(sock, pkt, sizeof(PPPoEPacket), 0)) < 0) {
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sysErr("recv (receivePacket)");
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return -1;
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}
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return 0;
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}
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/**********************************************************************
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*%FUNCTION: parsePacket
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*%ARGUMENTS:
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* packet -- the PPPoE discovery packet to parse
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* func -- function called for each tag in the packet
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* extra -- an opaque data pointer supplied to parsing function
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*%RETURNS:
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* 0 if everything went well; -1 if there was an error
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*%DESCRIPTION:
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* Parses a PPPoE discovery packet, calling "func" for each tag in the packet.
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* "func" is passed the additional argument "extra".
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***********************************************************************/
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int
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parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra)
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{
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UINT16_t len = ntohs(packet->length);
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unsigned char *curTag;
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UINT16_t tagType, tagLen;
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if (PPPOE_VER(packet->vertype) != 1) {
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fprintf(stderr, "Invalid PPPoE version (%d)\n",
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PPPOE_VER(packet->vertype));
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return -1;
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}
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if (PPPOE_TYPE(packet->vertype) != 1) {
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fprintf(stderr, "Invalid PPPoE type (%d)\n",
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PPPOE_TYPE(packet->vertype));
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return -1;
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}
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/* Do some sanity checks on packet */
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if (len > ETH_JUMBO_LEN - PPPOE_OVERHEAD) { /* 6-byte overhead for PPPoE header */
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fprintf(stderr, "Invalid PPPoE packet length (%u)\n", len);
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return -1;
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}
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/* Step through the tags */
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curTag = packet->payload;
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while(curTag - packet->payload < len) {
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/* Alignment is not guaranteed, so do this by hand... */
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tagType = (curTag[0] << 8) + curTag[1];
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tagLen = (curTag[2] << 8) + curTag[3];
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if (tagType == TAG_END_OF_LIST) {
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return 0;
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}
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if ((curTag - packet->payload) + tagLen + TAG_HDR_SIZE > len) {
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fprintf(stderr, "Invalid PPPoE tag length (%u)\n", tagLen);
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return -1;
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}
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func(tagType, tagLen, curTag+TAG_HDR_SIZE, extra);
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curTag = curTag + TAG_HDR_SIZE + tagLen;
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}
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return 0;
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}
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/**********************************************************************
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*%FUNCTION: parseForHostUniq
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*%ARGUMENTS:
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* type -- tag type
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* len -- tag length
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* data -- tag data.
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* extra -- user-supplied pointer. This is assumed to be a pointer to int.
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*%RETURNS:
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* Nothing
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*%DESCRIPTION:
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* If a HostUnique tag is found which matches our PID, sets *extra to 1.
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***********************************************************************/
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void
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parseForHostUniq(UINT16_t type, UINT16_t len, unsigned char *data,
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void *extra)
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{
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int *val = (int *) extra;
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if (type == TAG_HOST_UNIQ && len == sizeof(pid_t)) {
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pid_t tmp;
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memcpy(&tmp, data, len);
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if (tmp == getpid()) {
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*val = 1;
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}
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}
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}
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/**********************************************************************
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*%FUNCTION: packetIsForMe
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*%ARGUMENTS:
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* conn -- PPPoE connection info
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* packet -- a received PPPoE packet
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*%RETURNS:
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* 1 if packet is for this PPPoE daemon; 0 otherwise.
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*%DESCRIPTION:
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* If we are using the Host-Unique tag, verifies that packet contains
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* our unique identifier.
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***********************************************************************/
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int
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packetIsForMe(PPPoEConnection *conn, PPPoEPacket *packet)
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{
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int forMe = 0;
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/* If packet is not directed to our MAC address, forget it */
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if (memcmp(packet->ethHdr.h_dest, conn->myEth, ETH_ALEN)) return 0;
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/* If we're not using the Host-Unique tag, then accept the packet */
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if (!conn->useHostUniq) return 1;
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parsePacket(packet, parseForHostUniq, &forMe);
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return forMe;
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}
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/**********************************************************************
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*%FUNCTION: parsePADOTags
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*%ARGUMENTS:
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* type -- tag type
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* len -- tag length
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* data -- tag data
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* extra -- extra user data. Should point to a PacketCriteria structure
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* which gets filled in according to selected AC name and service
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* name.
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*%RETURNS:
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* Nothing
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*%DESCRIPTION:
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* Picks interesting tags out of a PADO packet
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***********************************************************************/
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void
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parsePADOTags(UINT16_t type, UINT16_t len, unsigned char *data,
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void *extra)
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{
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struct PacketCriteria *pc = (struct PacketCriteria *) extra;
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PPPoEConnection *conn = pc->conn;
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int i;
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switch(type) {
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case TAG_AC_NAME:
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pc->seenACName = 1;
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printf("Access-Concentrator: %.*s\n", (int) len, data);
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if (conn->acName && len == strlen(conn->acName) &&
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!strncmp((char *) data, conn->acName, len)) {
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pc->acNameOK = 1;
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}
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break;
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case TAG_SERVICE_NAME:
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pc->seenServiceName = 1;
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if (len > 0) {
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printf(" Service-Name: %.*s\n", (int) len, data);
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}
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if (conn->serviceName && len == strlen(conn->serviceName) &&
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!strncmp((char *) data, conn->serviceName, len)) {
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pc->serviceNameOK = 1;
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}
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break;
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case TAG_AC_COOKIE:
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printf("Got a cookie:");
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/* Print first 20 bytes of cookie */
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for (i=0; i<len && i < 20; i++) {
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printf(" %02x", (unsigned) data[i]);
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}
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if (i < len) printf("...");
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printf("\n");
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conn->cookie.type = htons(type);
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conn->cookie.length = htons(len);
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memcpy(conn->cookie.payload, data, len);
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break;
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case TAG_RELAY_SESSION_ID:
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printf("Got a Relay-ID:");
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/* Print first 20 bytes of relay ID */
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for (i=0; i<len && i < 20; i++) {
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printf(" %02x", (unsigned) data[i]);
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}
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if (i < len) printf("...");
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printf("\n");
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conn->relayId.type = htons(type);
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conn->relayId.length = htons(len);
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memcpy(conn->relayId.payload, data, len);
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break;
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case TAG_SERVICE_NAME_ERROR:
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printf("Got a Service-Name-Error tag: %.*s\n", (int) len, data);
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break;
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case TAG_AC_SYSTEM_ERROR:
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printf("Got a System-Error tag: %.*s\n", (int) len, data);
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break;
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case TAG_GENERIC_ERROR:
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printf("Got a Generic-Error tag: %.*s\n", (int) len, data);
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break;
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}
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}
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/***********************************************************************
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*%FUNCTION: sendPADI
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*%ARGUMENTS:
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* conn -- PPPoEConnection structure
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*%RETURNS:
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* Nothing
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*%DESCRIPTION:
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* Sends a PADI packet
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***********************************************************************/
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void
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sendPADI(PPPoEConnection *conn)
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{
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PPPoEPacket packet;
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unsigned char *cursor = packet.payload;
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PPPoETag *svc = (PPPoETag *) (&packet.payload);
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UINT16_t namelen = 0;
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UINT16_t plen;
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if (conn->serviceName) {
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namelen = (UINT16_t) strlen(conn->serviceName);
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}
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plen = TAG_HDR_SIZE + namelen;
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CHECK_ROOM(cursor, packet.payload, plen);
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/* Set destination to Ethernet broadcast address */
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memset(packet.ethHdr.h_dest, 0xFF, ETH_ALEN);
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memcpy(packet.ethHdr.h_source, conn->myEth, ETH_ALEN);
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packet.ethHdr.h_proto = htons(Eth_PPPOE_Discovery);
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packet.vertype = PPPOE_VER_TYPE(1, 1);
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packet.code = CODE_PADI;
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packet.session = 0;
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svc->type = TAG_SERVICE_NAME;
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svc->length = htons(namelen);
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CHECK_ROOM(cursor, packet.payload, namelen+TAG_HDR_SIZE);
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if (conn->serviceName) {
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memcpy(svc->payload, conn->serviceName, strlen(conn->serviceName));
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}
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cursor += namelen + TAG_HDR_SIZE;
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/* If we're using Host-Uniq, copy it over */
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if (conn->useHostUniq) {
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PPPoETag hostUniq;
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pid_t pid = getpid();
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hostUniq.type = htons(TAG_HOST_UNIQ);
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hostUniq.length = htons(sizeof(pid));
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memcpy(hostUniq.payload, &pid, sizeof(pid));
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CHECK_ROOM(cursor, packet.payload, sizeof(pid) + TAG_HDR_SIZE);
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memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE);
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cursor += sizeof(pid) + TAG_HDR_SIZE;
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plen += sizeof(pid) + TAG_HDR_SIZE;
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}
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packet.length = htons(plen);
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sendPacket(conn, conn->discoverySocket, &packet, (int) (plen + HDR_SIZE));
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if (conn->debugFile) {
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dumpPacket(conn->debugFile, &packet, "SENT");
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fprintf(conn->debugFile, "\n");
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fflush(conn->debugFile);
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}
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}
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/**********************************************************************
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*%FUNCTION: waitForPADO
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*%ARGUMENTS:
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* conn -- PPPoEConnection structure
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* timeout -- how long to wait (in seconds)
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*%RETURNS:
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* Nothing
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*%DESCRIPTION:
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* Waits for a PADO packet and copies useful information
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***********************************************************************/
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void
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waitForPADO(PPPoEConnection *conn, int timeout)
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{
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fd_set readable;
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int r;
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struct timeval tv;
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PPPoEPacket packet;
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int len;
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struct PacketCriteria pc;
|
|
pc.conn = conn;
|
|
pc.acNameOK = (conn->acName) ? 0 : 1;
|
|
pc.serviceNameOK = (conn->serviceName) ? 0 : 1;
|
|
pc.seenACName = 0;
|
|
pc.seenServiceName = 0;
|
|
conn->error = 0;
|
|
|
|
do {
|
|
if (BPF_BUFFER_IS_EMPTY) {
|
|
tv.tv_sec = timeout;
|
|
tv.tv_usec = 0;
|
|
|
|
FD_ZERO(&readable);
|
|
FD_SET(conn->discoverySocket, &readable);
|
|
|
|
while(1) {
|
|
r = select(conn->discoverySocket+1, &readable, NULL, NULL, &tv);
|
|
if (r >= 0 || errno != EINTR) break;
|
|
}
|
|
if (r < 0) {
|
|
perror("select (waitForPADO)");
|
|
return;
|
|
}
|
|
if (r == 0) return; /* Timed out */
|
|
}
|
|
|
|
/* Get the packet */
|
|
receivePacket(conn->discoverySocket, &packet, &len);
|
|
|
|
/* Check length */
|
|
if (ntohs(packet.length) + HDR_SIZE > len) {
|
|
fprintf(stderr, "Bogus PPPoE length field (%u)\n",
|
|
(unsigned int) ntohs(packet.length));
|
|
continue;
|
|
}
|
|
|
|
#ifdef USE_BPF
|
|
/* If it's not a Discovery packet, loop again */
|
|
if (etherType(&packet) != Eth_PPPOE_Discovery) continue;
|
|
#endif
|
|
|
|
if (conn->debugFile) {
|
|
dumpPacket(conn->debugFile, &packet, "RCVD");
|
|
fprintf(conn->debugFile, "\n");
|
|
fflush(conn->debugFile);
|
|
}
|
|
/* If it's not for us, loop again */
|
|
if (!packetIsForMe(conn, &packet)) continue;
|
|
|
|
if (packet.code == CODE_PADO) {
|
|
if (BROADCAST(packet.ethHdr.h_source)) {
|
|
fprintf(stderr, "Ignoring PADO packet from broadcast MAC address\n");
|
|
continue;
|
|
}
|
|
parsePacket(&packet, parsePADOTags, &pc);
|
|
if (conn->error)
|
|
return;
|
|
if (!pc.seenACName) {
|
|
fprintf(stderr, "Ignoring PADO packet with no AC-Name tag\n");
|
|
continue;
|
|
}
|
|
if (!pc.seenServiceName) {
|
|
fprintf(stderr, "Ignoring PADO packet with no Service-Name tag\n");
|
|
continue;
|
|
}
|
|
conn->numPADOs++;
|
|
printf("--------------------------------------------------\n");
|
|
if (pc.acNameOK && pc.serviceNameOK) {
|
|
memcpy(conn->peerEth, packet.ethHdr.h_source, ETH_ALEN);
|
|
if (conn->printACNames) {
|
|
printf("AC-Ethernet-Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
(unsigned) conn->peerEth[0],
|
|
(unsigned) conn->peerEth[1],
|
|
(unsigned) conn->peerEth[2],
|
|
(unsigned) conn->peerEth[3],
|
|
(unsigned) conn->peerEth[4],
|
|
(unsigned) conn->peerEth[5]);
|
|
continue;
|
|
}
|
|
conn->discoveryState = STATE_RECEIVED_PADO;
|
|
break;
|
|
}
|
|
}
|
|
} while (conn->discoveryState != STATE_RECEIVED_PADO);
|
|
}
|
|
|
|
/**********************************************************************
|
|
*%FUNCTION: discovery
|
|
*%ARGUMENTS:
|
|
* conn -- PPPoE connection info structure
|
|
*%RETURNS:
|
|
* Nothing
|
|
*%DESCRIPTION:
|
|
* Performs the PPPoE discovery phase
|
|
***********************************************************************/
|
|
void
|
|
discovery(PPPoEConnection *conn)
|
|
{
|
|
int padiAttempts = 0;
|
|
int timeout = PADI_TIMEOUT;
|
|
|
|
conn->discoverySocket =
|
|
openInterface(conn->ifName, Eth_PPPOE_Discovery, conn->myEth);
|
|
|
|
do {
|
|
padiAttempts++;
|
|
if (padiAttempts > MAX_PADI_ATTEMPTS) {
|
|
fprintf(stderr, "Timeout waiting for PADO packets\n");
|
|
close(conn->discoverySocket);
|
|
conn->discoverySocket = -1;
|
|
return;
|
|
}
|
|
sendPADI(conn);
|
|
conn->discoveryState = STATE_SENT_PADI;
|
|
waitForPADO(conn, timeout);
|
|
} while (!conn->numPADOs);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int opt;
|
|
PPPoEConnection *conn;
|
|
|
|
conn = malloc(sizeof(PPPoEConnection));
|
|
if (!conn)
|
|
fatalSys("malloc");
|
|
|
|
memset(conn, 0, sizeof(PPPoEConnection));
|
|
|
|
while ((opt = getopt(argc, argv, "I:D:VUAS:C:h")) > 0) {
|
|
switch(opt) {
|
|
case 'S':
|
|
conn->serviceName = xstrdup(optarg);
|
|
break;
|
|
case 'C':
|
|
conn->acName = xstrdup(optarg);
|
|
break;
|
|
case 'U':
|
|
conn->useHostUniq = 1;
|
|
break;
|
|
case 'D':
|
|
conn->debugFile = fopen(optarg, "w");
|
|
if (!conn->debugFile) {
|
|
fprintf(stderr, "Could not open %s: %s\n",
|
|
optarg, strerror(errno));
|
|
exit(1);
|
|
}
|
|
fprintf(conn->debugFile, "pppoe-discovery %s\n", RP_VERSION);
|
|
break;
|
|
case 'I':
|
|
conn->ifName = xstrdup(optarg);
|
|
break;
|
|
case 'A':
|
|
/* this is the default */
|
|
break;
|
|
case 'V':
|
|
case 'h':
|
|
usage();
|
|
exit(0);
|
|
default:
|
|
usage();
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* default interface name */
|
|
if (!conn->ifName)
|
|
conn->ifName = strdup("eth0");
|
|
|
|
conn->discoverySocket = -1;
|
|
conn->sessionSocket = -1;
|
|
conn->printACNames = 1;
|
|
|
|
discovery(conn);
|
|
exit(0);
|
|
}
|
|
|
|
void rp_fatal(char const *str)
|
|
{
|
|
fprintf(stderr, "%s\n", str);
|
|
exit(1);
|
|
}
|
|
|
|
void fatalSys(char const *str)
|
|
{
|
|
perror(str);
|
|
exit(1);
|
|
}
|
|
|
|
void sysErr(char const *str)
|
|
{
|
|
rp_fatal(str);
|
|
}
|
|
|
|
char *xstrdup(const char *s)
|
|
{
|
|
register char *ret = strdup(s);
|
|
if (!ret)
|
|
sysErr("strdup");
|
|
return ret;
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
fprintf(stderr, "Usage: pppoe-discovery [options]\n");
|
|
fprintf(stderr, "\nVersion " RP_VERSION "\n");
|
|
}
|