+++ /dev/null
-/***********************************************************************
-*
-* plugin.c
-*
-* pppd plugin for kernel-mode PPPoE on Linux
-*
-* Copyright (C) 2001 by Roaring Penguin Software Inc., Michal Ostrowski
-* and Jamal Hadi Salim.
-*
-* Much code and many ideas derived from pppoe plugin by Michal
-* Ostrowski and Jamal Hadi Salim, which carries this copyright:
-*
-* Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
-* Jamal Hadi Salim <hadi@cyberus.ca>
-* Borrows heavily from the PPPoATM plugin by Mitchell Blank Jr.,
-* which is based in part on work from Jens Axboe and Paul Mackerras.
-*
-* This program is free software; you can redistribute it and/or
-* modify it under the terms of the GNU General Public License
-* as published by the Free Software Foundation; either version
-* 2 of the License, or (at your option) any later version.
-*
-***********************************************************************/
-
-static char const RCSID[] =
-"$Id: plugin.c,v 1.17 2008/06/15 04:35:50 paulus Exp $";
-
-#define _GNU_SOURCE 1
-#include "pppoe.h"
-
-#include "pppd/pppd.h"
-#include "pppd/fsm.h"
-#include "pppd/lcp.h"
-#include "pppd/ipcp.h"
-#include "pppd/ccp.h"
-/* #include "pppd/pathnames.h" */
-
-#include <linux/types.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <net/if_arp.h>
-#include <linux/ppp_defs.h>
-#include <linux/if_pppox.h>
-
-#ifndef _ROOT_PATH
-#define _ROOT_PATH ""
-#endif
-
-#define _PATH_ETHOPT _ROOT_PATH "/etc/ppp/options."
-
-char pppd_version[] = VERSION;
-
-/* From sys-linux.c in pppd -- MUST FIX THIS! */
-extern int new_style_driver;
-
-char *pppd_pppoe_service = NULL;
-static char *acName = NULL;
-static char *existingSession = NULL;
-static int printACNames = 0;
-static char *pppoe_reqd_mac = NULL;
-unsigned char pppoe_reqd_mac_addr[6];
-static char *host_uniq;
-static int pppoe_padi_timeout = PADI_TIMEOUT;
-static int pppoe_padi_attempts = MAX_PADI_ATTEMPTS;
-
-static int PPPoEDevnameHook(char *cmd, char **argv, int doit);
-static option_t Options[] = {
- { "device name", o_wild, (void *) &PPPoEDevnameHook,
- "PPPoE device name",
- OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC,
- devnam},
- { "rp_pppoe_service", o_string, &pppd_pppoe_service,
- "Desired PPPoE service name" },
- { "rp_pppoe_ac", o_string, &acName,
- "Desired PPPoE access concentrator name" },
- { "rp_pppoe_sess", o_string, &existingSession,
- "Attach to existing session (sessid:macaddr)" },
- { "rp_pppoe_verbose", o_int, &printACNames,
- "Be verbose about discovered access concentrators"},
- { "pppoe-mac", o_string, &pppoe_reqd_mac,
- "Only connect to specified MAC address" },
- { "host-uniq", o_string, &host_uniq,
- "Set the Host-Uniq to the supplied hex string" },
- { "pppoe-padi-timeout", o_int, &pppoe_padi_timeout,
- "Initial timeout for discovery packets in seconds" },
- { "pppoe-padi-attempts", o_int, &pppoe_padi_attempts,
- "Number of discovery attempts" },
- { NULL }
-};
-int (*OldDevnameHook)(char *cmd, char **argv, int doit) = NULL;
-static PPPoEConnection *conn = NULL;
-
-/**********************************************************************
- * %FUNCTION: PPPOEInitDevice
- * %ARGUMENTS:
- * None
- * %RETURNS:
- *
- * %DESCRIPTION:
- * Initializes PPPoE device.
- ***********************************************************************/
-static int
-PPPOEInitDevice(void)
-{
- conn = malloc(sizeof(PPPoEConnection));
- if (!conn) {
- novm("PPPoE session data");
- }
- memset(conn, 0, sizeof(PPPoEConnection));
- conn->ifName = devnam;
- conn->discoverySocket = -1;
- conn->sessionSocket = -1;
- conn->printACNames = printACNames;
- conn->discoveryTimeout = pppoe_padi_timeout;
- conn->discoveryAttempts = pppoe_padi_attempts;
- return 1;
-}
-
-/**********************************************************************
- * %FUNCTION: PPPOEConnectDevice
- * %ARGUMENTS:
- * None
- * %RETURNS:
- * Non-negative if all goes well; -1 otherwise
- * %DESCRIPTION:
- * Connects PPPoE device.
- ***********************************************************************/
-static int
-PPPOEConnectDevice(void)
-{
- struct sockaddr_pppox sp;
- struct ifreq ifr;
- int s;
-
- /* Open session socket before discovery phase, to avoid losing session */
- /* packets sent by peer just after PADS packet (noted on some Cisco */
- /* server equipment). */
- /* Opening this socket just before waitForPADS in the discovery() */
- /* function would be more appropriate, but it would mess-up the code */
- conn->sessionSocket = socket(AF_PPPOX, SOCK_STREAM, PX_PROTO_OE);
- if (conn->sessionSocket < 0) {
- error("Failed to create PPPoE socket: %m");
- return -1;
- }
-
- /* Restore configuration */
- lcp_allowoptions[0].mru = conn->mtu;
- lcp_wantoptions[0].mru = conn->mru;
-
- /* Update maximum MRU */
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- error("Can't get MTU for %s: %m", conn->ifName);
- goto errout;
- }
- strlcpy(ifr.ifr_name, conn->ifName, sizeof(ifr.ifr_name));
- if (ioctl(s, SIOCGIFMTU, &ifr) < 0) {
- error("Can't get MTU for %s: %m", conn->ifName);
- close(s);
- goto errout;
- }
- close(s);
-
- if (lcp_allowoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
- lcp_allowoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
- if (lcp_wantoptions[0].mru > ifr.ifr_mtu - TOTAL_OVERHEAD)
- lcp_wantoptions[0].mru = ifr.ifr_mtu - TOTAL_OVERHEAD;
-
- if (host_uniq) {
- if (!parseHostUniq(host_uniq, &conn->hostUniq))
- fatal("Illegal value for host-uniq option");
- } else {
- /* if a custom host-uniq is not supplied, use our PID */
- pid_t pid = getpid();
- conn->hostUniq.type = htons(TAG_HOST_UNIQ);
- conn->hostUniq.length = htons(sizeof(pid));
- memcpy(conn->hostUniq.payload, &pid, sizeof(pid));
- }
-
- conn->acName = acName;
- conn->serviceName = pppd_pppoe_service;
- strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
- if (existingSession) {
- unsigned int mac[ETH_ALEN];
- int i, ses;
- if (sscanf(existingSession, "%d:%x:%x:%x:%x:%x:%x",
- &ses, &mac[0], &mac[1], &mac[2],
- &mac[3], &mac[4], &mac[5]) != 7) {
- fatal("Illegal value for rp_pppoe_sess option");
- }
- conn->session = htons(ses);
- for (i=0; i<ETH_ALEN; i++) {
- conn->peerEth[i] = (unsigned char) mac[i];
- }
- } else {
- conn->discoverySocket =
- openInterface(conn->ifName, Eth_PPPOE_Discovery, conn->myEth);
- discovery(conn);
- if (conn->discoveryState != STATE_SESSION) {
- error("Unable to complete PPPoE Discovery");
- goto errout;
- }
- }
-
- /* Set PPPoE session-number for further consumption */
- ppp_session_number = ntohs(conn->session);
-
- sp.sa_family = AF_PPPOX;
- sp.sa_protocol = PX_PROTO_OE;
- sp.sa_addr.pppoe.sid = conn->session;
- memcpy(sp.sa_addr.pppoe.dev, conn->ifName, IFNAMSIZ);
- memcpy(sp.sa_addr.pppoe.remote, conn->peerEth, ETH_ALEN);
-
- /* Set remote_number for ServPoET */
- sprintf(remote_number, "%02X:%02X:%02X:%02X:%02X:%02X",
- (unsigned) conn->peerEth[0],
- (unsigned) conn->peerEth[1],
- (unsigned) conn->peerEth[2],
- (unsigned) conn->peerEth[3],
- (unsigned) conn->peerEth[4],
- (unsigned) conn->peerEth[5]);
-
- warn("Connected to %02X:%02X:%02X:%02X:%02X:%02X via interface %s",
- (unsigned) conn->peerEth[0],
- (unsigned) conn->peerEth[1],
- (unsigned) conn->peerEth[2],
- (unsigned) conn->peerEth[3],
- (unsigned) conn->peerEth[4],
- (unsigned) conn->peerEth[5],
- conn->ifName);
-
- script_setenv("MACREMOTE", remote_number, 0);
-
- if (connect(conn->sessionSocket, (struct sockaddr *) &sp,
- sizeof(struct sockaddr_pppox)) < 0) {
- error("Failed to connect PPPoE socket: %d %m", errno);
- goto errout;
- }
-
- return conn->sessionSocket;
-
- errout:
- if (conn->discoverySocket >= 0) {
- sendPADT(conn, NULL);
- close(conn->discoverySocket);
- conn->discoverySocket = -1;
- }
- close(conn->sessionSocket);
- return -1;
-}
-
-static void
-PPPOERecvConfig(int mru,
- u_int32_t asyncmap,
- int pcomp,
- int accomp)
-{
-#if 0 /* broken protocol, but no point harrassing the users I guess... */
- if (mru > MAX_PPPOE_MTU)
- warn("Couldn't increase MRU to %d", mru);
-#endif
-}
-
-/**********************************************************************
- * %FUNCTION: PPPOEDisconnectDevice
- * %ARGUMENTS:
- * None
- * %RETURNS:
- * Nothing
- * %DESCRIPTION:
- * Disconnects PPPoE device
- ***********************************************************************/
-static void
-PPPOEDisconnectDevice(void)
-{
- struct sockaddr_pppox sp;
-
- sp.sa_family = AF_PPPOX;
- sp.sa_protocol = PX_PROTO_OE;
- sp.sa_addr.pppoe.sid = 0;
- memcpy(sp.sa_addr.pppoe.dev, conn->ifName, IFNAMSIZ);
- memcpy(sp.sa_addr.pppoe.remote, conn->peerEth, ETH_ALEN);
- if (connect(conn->sessionSocket, (struct sockaddr *) &sp,
- sizeof(struct sockaddr_pppox)) < 0 && errno != EALREADY)
- error("Failed to disconnect PPPoE socket: %d %m", errno);
- close(conn->sessionSocket);
- if (conn->discoverySocket >= 0) {
- sendPADT(conn, NULL);
- close(conn->discoverySocket);
- }
-}
-
-static void
-PPPOEDeviceOptions(void)
-{
- char buf[MAXPATHLEN];
-
- strlcpy(buf, _PATH_ETHOPT, MAXPATHLEN);
- strlcat(buf, devnam, MAXPATHLEN);
- if (!options_from_file(buf, 0, 0, 1))
- exit(EXIT_OPTION_ERROR);
-
-}
-
-struct channel pppoe_channel;
-
-/**********************************************************************
- * %FUNCTION: PPPoEDevnameHook
- * %ARGUMENTS:
- * cmd -- the command (actually, the device name
- * argv -- argument vector
- * doit -- if non-zero, set device name. Otherwise, just check if possible
- * %RETURNS:
- * 1 if we will handle this device; 0 otherwise.
- * %DESCRIPTION:
- * Checks if name is a valid interface name; if so, returns 1. Also
- * sets up devnam (string representation of device).
- ***********************************************************************/
-static int
-PPPoEDevnameHook(char *cmd, char **argv, int doit)
-{
- int r = 1;
- int fd;
- struct ifreq ifr;
-
- /*
- * Take any otherwise-unrecognized option as a possible device name,
- * and test if it is the name of a network interface with a
- * hardware address whose sa_family is ARPHRD_ETHER.
- */
- if (strlen(cmd) > 4 && !strncmp(cmd, "nic-", 4)) {
- /* Strip off "nic-" */
- cmd += 4;
- }
-
- /* Open a socket */
- if ((fd = socket(PF_PACKET, SOCK_RAW, 0)) < 0) {
- r = 0;
- }
-
- /* Try getting interface index */
- if (r) {
- strlcpy(ifr.ifr_name, cmd, sizeof(ifr.ifr_name));
- if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
- r = 0;
- } else {
- if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
- r = 0;
- } else {
- if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
- if (doit)
- error("Interface %s not Ethernet", cmd);
- r = 0;
- }
- }
- }
- }
-
- /* Close socket */
- close(fd);
- if (r && doit) {
- strlcpy(devnam, cmd, sizeof(devnam));
- if (the_channel != &pppoe_channel) {
-
- the_channel = &pppoe_channel;
- modem = 0;
-
- PPPOEInitDevice();
- }
- return 1;
- }
-
- return r;
-}
-
-/**********************************************************************
- * %FUNCTION: plugin_init
- * %ARGUMENTS:
- * None
- * %RETURNS:
- * Nothing
- * %DESCRIPTION:
- * Initializes hooks for pppd plugin
- ***********************************************************************/
-void
-plugin_init(void)
-{
- if (!ppp_available() && !new_style_driver) {
- fatal("Linux kernel does not support PPPoE -- are you running 2.4.x?");
- }
-
- add_options(Options);
-
- info("RP-PPPoE plugin version %s compiled against pppd %s",
- RP_VERSION, VERSION);
-}
-
-void pppoe_check_options(void)
-{
- unsigned int mac[6];
- int i;
-
- if (pppoe_reqd_mac != NULL) {
- if (sscanf(pppoe_reqd_mac, "%x:%x:%x:%x:%x:%x",
- &mac[0], &mac[1], &mac[2], &mac[3],
- &mac[4], &mac[5]) != 6) {
- option_error("cannot parse pppoe-mac option value");
- exit(EXIT_OPTION_ERROR);
- }
- for (i = 0; i < 6; ++i)
- conn->req_peer_mac[i] = mac[i];
- conn->req_peer = 1;
- }
-
- lcp_allowoptions[0].neg_accompression = 0;
- lcp_wantoptions[0].neg_accompression = 0;
-
- lcp_allowoptions[0].neg_asyncmap = 0;
- lcp_wantoptions[0].neg_asyncmap = 0;
-
- lcp_allowoptions[0].neg_pcompression = 0;
- lcp_wantoptions[0].neg_pcompression = 0;
-
- if (lcp_allowoptions[0].mru > MAX_PPPOE_MTU)
- lcp_allowoptions[0].mru = MAX_PPPOE_MTU;
- if (lcp_wantoptions[0].mru > MAX_PPPOE_MTU)
- lcp_wantoptions[0].mru = MAX_PPPOE_MTU;
-
- /* Save configuration */
- conn->mtu = lcp_allowoptions[0].mru;
- conn->mru = lcp_wantoptions[0].mru;
-
- ccp_allowoptions[0].deflate = 0;
- ccp_wantoptions[0].deflate = 0;
-
- ipcp_allowoptions[0].neg_vj = 0;
- ipcp_wantoptions[0].neg_vj = 0;
-
- ccp_allowoptions[0].bsd_compress = 0;
- ccp_wantoptions[0].bsd_compress = 0;
-}
-
-struct channel pppoe_channel = {
- .options = Options,
- .process_extra_options = &PPPOEDeviceOptions,
- .check_options = pppoe_check_options,
- .connect = &PPPOEConnectDevice,
- .disconnect = &PPPOEDisconnectDevice,
- .establish_ppp = &generic_establish_ppp,
- .disestablish_ppp = &generic_disestablish_ppp,
- .send_config = NULL,
- .recv_config = &PPPOERecvConfig,
- .close = NULL,
- .cleanup = NULL
-};
projects / ppp.git / blobdiff