678 lines
19 KiB
C
678 lines
19 KiB
C
/*-
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* Copyright (c) 1999-2001 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netgraph.h>
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#include <net/ethernet.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netgraph/ng_ether.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/ng_pppoe.h>
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#include <netgraph/ng_socket.h>
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#include <errno.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <sys/fcntl.h>
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#ifndef NOKLDLOAD
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#include <sys/linker.h>
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#include <sys/module.h>
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#endif
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <syslog.h>
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#include <termios.h>
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#include <unistd.h>
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#define DEFAULT_EXEC_PREFIX "exec /usr/sbin/ppp -direct "
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#define HISMACADDR "HISMACADDR"
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static int ReceivedSignal;
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static int
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usage(const char *prog)
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{
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fprintf(stderr, "Usage: %s [-Fd] [-P pidfile] [-a name] [-e exec | -l label]"
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" [-p provider] interface\n", prog);
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return EX_USAGE;
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}
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static void
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Farewell(int sig)
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{
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ReceivedSignal = sig;
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}
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static int
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ConfigureNode(const char *prog, const char *iface, const char *provider,
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int cs, int ds, int debug, struct ngm_connect *ngc)
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{
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/*
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* We're going to do this with the passed `ds' & `cs' descriptors:
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*
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* .---------.
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* | ether |
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* | <iface> |
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* `---------'
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* (orphan) ds cs
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* | | |
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* | | |
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* (ethernet) | |
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* .---------. .-----------.
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* | pppoe | | socket |
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* | <iface> |(pppoe-<pid>)<---->(pppoe-<pid>)| <unnamed> |
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* `--------- `-----------'
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* (exec-<pid>)
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* ^ .-----------. .-------------.
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* | | socket | | ppp -direct |
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* `--->(exec-<pid>)| <unnamed> |--fd--| provider |
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* `-----------' `-------------'
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*
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* where there are potentially many ppp processes running off of the
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* same PPPoE node.
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* The exec-<pid> hook isn't made 'till we Spawn().
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*/
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char *epath, *spath;
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struct ngpppoe_init_data *data;
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const struct hooklist *hlist;
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const struct nodeinfo *ninfo;
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const struct linkinfo *nlink;
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struct ngm_mkpeer mkp;
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struct ng_mesg *resp;
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u_char rbuf[2048];
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int f, plen;
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/*
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* Ask for a list of hooks attached to the "ether" node. This node should
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* magically exist as a way of hooking stuff onto an ethernet device
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*/
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epath = (char *)alloca(strlen(iface) + 2);
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sprintf(epath, "%s:", iface);
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if (debug)
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fprintf(stderr, "Sending NGM_LISTHOOKS to %s\n", epath);
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if (NgSendMsg(cs, epath, NGM_GENERIC_COOKIE, NGM_LISTHOOKS, NULL, 0) < 0) {
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if (errno == ENOENT)
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fprintf(stderr, "%s Cannot send a netgraph message: Invalid interface\n",
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epath);
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else
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fprintf(stderr, "%s Cannot send a netgraph message: %s\n",
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epath, strerror(errno));
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return EX_UNAVAILABLE;
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}
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/* Get our list back */
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resp = (struct ng_mesg *)rbuf;
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if (NgRecvMsg(cs, resp, sizeof rbuf, NULL) <= 0) {
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perror("Cannot get netgraph response");
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return EX_UNAVAILABLE;
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}
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hlist = (const struct hooklist *)resp->data;
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ninfo = &hlist->nodeinfo;
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if (debug)
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fprintf(stderr, "Got reply from id [%x]: Type %s with %d hooks\n",
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ninfo->id, ninfo->type, ninfo->hooks);
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/* Make sure we've got the right type of node */
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if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE, sizeof NG_ETHER_NODE_TYPE - 1)) {
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fprintf(stderr, "%s Unexpected node type ``%s'' (wanted ``"
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NG_ETHER_NODE_TYPE "'')\n", epath, ninfo->type);
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return EX_DATAERR;
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}
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/* look for a hook already attached. */
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for (f = 0; f < ninfo->hooks; f++) {
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nlink = &hlist->link[f];
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if (debug)
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fprintf(stderr, " Got [%x]:%s -> [%x]:%s\n", ninfo->id,
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nlink->ourhook, nlink->nodeinfo.id, nlink->peerhook);
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if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
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!strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
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/*
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* Something is using the data coming out of this `ether' node.
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* If it's a PPPoE node, we use that node, otherwise we complain that
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* someone else is using the node.
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*/
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if (strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE)) {
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fprintf(stderr, "%s Node type %s is currently active\n",
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epath, nlink->nodeinfo.type);
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return EX_UNAVAILABLE;
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}
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break;
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}
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}
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if (f == ninfo->hooks) {
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/*
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* Create a new PPPoE node connected to the `ether' node using
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* the magic `orphan' and `ethernet' hooks
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*/
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snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
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snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
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snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
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if (debug)
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fprintf(stderr, "Send MKPEER: %s%s -> [type %s]:%s\n", epath,
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mkp.ourhook, mkp.type, mkp.peerhook);
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if (NgSendMsg(cs, epath, NGM_GENERIC_COOKIE,
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NGM_MKPEER, &mkp, sizeof mkp) < 0) {
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fprintf(stderr, "%s Cannot create a peer PPPoE node: %s\n",
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epath, strerror(errno));
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return EX_OSERR;
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}
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}
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/* Connect the PPPoE node to our socket node. */
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snprintf(ngc->path, sizeof ngc->path, "%s%s", epath, NG_ETHER_HOOK_ORPHAN);
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snprintf(ngc->ourhook, sizeof ngc->ourhook, "pppoe-%ld", (long)getpid());
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memcpy(ngc->peerhook, ngc->ourhook, sizeof ngc->peerhook);
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if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE,
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NGM_CONNECT, ngc, sizeof *ngc) < 0) {
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perror("Cannot CONNECT PPPoE and socket nodes");
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return EX_OSERR;
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}
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plen = strlen(provider);
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data = (struct ngpppoe_init_data *)alloca(sizeof *data + plen);
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snprintf(data->hook, sizeof data->hook, "%s", ngc->peerhook);
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memcpy(data->data, provider, plen);
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data->data_len = plen;
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spath = (char *)alloca(strlen(ngc->peerhook) + 3);
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strcpy(spath, ".:");
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strcpy(spath + 2, ngc->ourhook);
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if (debug) {
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if (provider)
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fprintf(stderr, "Sending PPPOE_LISTEN to %s, provider %s\n",
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spath, provider);
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else
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fprintf(stderr, "Sending PPPOE_LISTEN to %s\n", spath);
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}
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if (NgSendMsg(cs, spath, NGM_PPPOE_COOKIE, NGM_PPPOE_LISTEN,
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data, sizeof *data + plen) == -1) {
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fprintf(stderr, "%s: Cannot LISTEN on netgraph node: %s\n",
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spath, strerror(errno));
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return EX_OSERR;
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}
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return 0;
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}
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static void
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Spawn(const char *prog, const char *acname, const char *provider,
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const char *exec, struct ngm_connect ngc, int cs, int ds, void *request,
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int sz, int debug)
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{
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char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
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struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
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struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
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struct ngpppoe_init_data *data;
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unsigned char *macaddr;
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char env[sizeof(HISMACADDR)+18], unknown[14], *path;
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const char *msg;
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int ret, slen;
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switch ((ret = fork())) {
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case -1:
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syslog(LOG_ERR, "fork: %m");
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break;
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case 0:
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switch (fork()) {
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case 0:
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break;
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case -1:
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_exit(errno);
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default:
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_exit(0);
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}
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close(cs);
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close(ds);
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/* Create a new socket node */
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if (debug)
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syslog(LOG_INFO, "Creating a new socket node");
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if (NgMkSockNode(NULL, &cs, &ds) == -1) {
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syslog(LOG_ERR, "Cannot create netgraph socket node: %m");
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_exit(EX_CANTCREAT);
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}
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/* Connect the PPPoE node to our new socket node. */
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snprintf(ngc.ourhook, sizeof ngc.ourhook, "exec-%ld", (long)getpid());
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memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
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if (debug)
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syslog(LOG_INFO, "Sending CONNECT from .:%s -> %s.%s",
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ngc.ourhook, ngc.path, ngc.peerhook);
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if (NgSendMsg(cs, ".:", NGM_GENERIC_COOKIE,
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NGM_CONNECT, &ngc, sizeof ngc) < 0) {
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syslog(LOG_ERR, "Cannot CONNECT PPPoE and socket nodes: %m");
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_exit(EX_OSERR);
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}
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/*
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* If we tell the socket node not to LINGER, it will go away when
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* the last hook is removed.
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*/
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if (debug)
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syslog(LOG_INFO, "Sending NGM_SOCK_CMD_NOLINGER to socket");
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if (NgSendMsg(cs, ".:", NGM_SOCKET_COOKIE,
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NGM_SOCK_CMD_NOLINGER, NULL, 0) < 0) {
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syslog(LOG_ERR, "Cannot send NGM_SOCK_CMD_NOLINGER: %m");
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_exit(EX_OSERR);
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}
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/* Put the PPPoE node into OFFER mode */
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slen = strlen(acname);
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data = (struct ngpppoe_init_data *)alloca(sizeof *data + slen);
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snprintf(data->hook, sizeof data->hook, "%s", ngc.ourhook);
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memcpy(data->data, acname, slen);
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data->data_len = slen;
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path = (char *)alloca(strlen(ngc.ourhook) + 3);
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strcpy(path, ".:");
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strcpy(path + 2, ngc.ourhook);
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syslog(LOG_INFO, "Offering to %s as access concentrator %s",
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path, acname);
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if (NgSendMsg(cs, path, NGM_PPPOE_COOKIE, NGM_PPPOE_OFFER,
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data, sizeof *data + slen) == -1) {
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syslog(LOG_INFO, "%s: Cannot OFFER on netgraph node: %m", path);
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_exit(EX_OSERR);
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}
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/* If we have a provider code, set it */
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if (provider) {
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slen = strlen(provider);
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data = (struct ngpppoe_init_data *)alloca(sizeof *data + slen);
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snprintf(data->hook, sizeof data->hook, "%s", ngc.ourhook);
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memcpy(data->data, provider, slen);
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data->data_len = slen;
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syslog(LOG_INFO, "adding to %s as offered service %s",
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path, acname);
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if (NgSendMsg(cs, path, NGM_PPPOE_COOKIE, NGM_PPPOE_SERVICE,
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data, sizeof *data + slen) == -1) {
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syslog(LOG_INFO, "%s: Cannot add service on netgraph node: %m", path);
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_exit(EX_OSERR);
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}
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}
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/* Put the peer's MAC address in the environment */
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if (sz >= sizeof(struct ether_header)) {
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macaddr = ((struct ether_header *)request)->ether_shost;
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snprintf(env, sizeof(env), "%s=%x:%x:%x:%x:%x:%x", HISMACADDR,
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macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4],
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macaddr[5]);
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if (putenv(env) != 0)
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syslog(LOG_INFO, "putenv: cannot set %s: %m", env);
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}
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/* And send our request data to the waiting node */
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if (debug)
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syslog(LOG_INFO, "Sending original request to %s (%d bytes)", path, sz);
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if (NgSendData(ds, ngc.ourhook, request, sz) == -1) {
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syslog(LOG_ERR, "Cannot send original request to %s: %m", path);
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_exit(EX_OSERR);
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}
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/* Then wait for a success indication */
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if (debug)
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syslog(LOG_INFO, "Waiting for a SUCCESS reply %s", path);
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do {
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if ((ret = NgRecvMsg(cs, rep, sizeof msgbuf, NULL)) < 0) {
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syslog(LOG_ERR, "%s: Cannot receive a message: %m", path);
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_exit(EX_OSERR);
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}
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if (ret == 0) {
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/* The socket has been closed */
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syslog(LOG_INFO, "%s: Client timed out", path);
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_exit(EX_TEMPFAIL);
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}
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if (rep->header.version != NG_VERSION) {
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syslog(LOG_ERR, "%ld: Unexpected netgraph version, expected %ld",
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(long)rep->header.version, (long)NG_VERSION);
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_exit(EX_PROTOCOL);
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}
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if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
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syslog(LOG_INFO, "%ld: Unexpected netgraph cookie, expected %ld",
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(long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
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continue;
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}
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switch (rep->header.cmd) {
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case NGM_PPPOE_SET_FLAG: msg = "SET_FLAG"; break;
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case NGM_PPPOE_CONNECT: msg = "CONNECT"; break;
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case NGM_PPPOE_LISTEN: msg = "LISTEN"; break;
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case NGM_PPPOE_OFFER: msg = "OFFER"; break;
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case NGM_PPPOE_SUCCESS: msg = "SUCCESS"; break;
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case NGM_PPPOE_FAIL: msg = "FAIL"; break;
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case NGM_PPPOE_CLOSE: msg = "CLOSE"; break;
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case NGM_PPPOE_GET_STATUS: msg = "GET_STATUS"; break;
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default:
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snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
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msg = unknown;
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break;
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}
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switch (rep->header.cmd) {
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case NGM_PPPOE_FAIL:
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case NGM_PPPOE_CLOSE:
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syslog(LOG_ERR, "Received NGM_PPPOE_%s (hook \"%s\")",
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msg, sts->hook);
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_exit(0);
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}
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syslog(LOG_INFO, "Received NGM_PPPOE_%s (hook \"%s\")", msg, sts->hook);
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} while (rep->header.cmd != NGM_PPPOE_SUCCESS);
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dup2(ds, STDIN_FILENO);
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dup2(ds, STDOUT_FILENO);
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close(ds);
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close(cs);
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setsid();
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syslog(LOG_INFO, "Executing: %s", exec);
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execlp(_PATH_BSHELL, _PATH_BSHELL, "-c", exec, (char *)NULL);
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syslog(LOG_ERR, "execlp failed: %m");
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_exit(EX_OSFILE);
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default:
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wait(&ret);
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errno = ret;
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if (errno)
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syslog(LOG_ERR, "Second fork failed: %m");
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break;
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}
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}
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#ifndef NOKLDLOAD
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static int
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LoadModules(void)
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{
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const char *module[] = { "netgraph", "ng_socket", "ng_ether", "ng_pppoe" };
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int f;
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for (f = 0; f < sizeof module / sizeof *module; f++)
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if (modfind(module[f]) == -1 && kldload(module[f]) == -1) {
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fprintf(stderr, "kldload: %s: %s\n", module[f], strerror(errno));
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return 0;
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}
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return 1;
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}
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#endif
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static void
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nglog(const char *fmt, ...)
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{
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char nfmt[256];
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va_list ap;
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snprintf(nfmt, sizeof nfmt, "%s: %s", fmt, strerror(errno));
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va_start(ap, fmt);
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vsyslog(LOG_INFO, nfmt, ap);
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va_end(ap);
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}
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static void
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nglogx(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vsyslog(LOG_INFO, fmt, ap);
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va_end(ap);
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}
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int
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main(int argc, char **argv)
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{
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char hostname[MAXHOSTNAMELEN], *exec, rhook[NG_HOOKLEN + 1];
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unsigned char response[1024];
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const char *label, *prog, *provider, *acname;
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struct ngm_connect ngc;
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struct sigaction act;
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int ch, cs, ds, ret, optF, optd, optn, sz, f;
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const char *pidfile;
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prog = strrchr(argv[0], '/');
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prog = prog ? prog + 1 : argv[0];
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pidfile = NULL;
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exec = NULL;
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label = NULL;
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acname = NULL;
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provider = "";
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optF = optd = optn = 0;
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while ((ch = getopt(argc, argv, "FP:a:de:l:n:p:")) != -1) {
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switch (ch) {
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case 'F':
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optF = 1;
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break;
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case 'P':
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pidfile = optarg;
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break;
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case 'a':
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acname = optarg;
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break;
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case 'd':
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optd = 1;
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break;
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case 'e':
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exec = optarg;
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break;
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case 'l':
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label = optarg;
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break;
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case 'n':
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optn = 1;
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NgSetDebug(atoi(optarg));
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break;
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case 'p':
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provider = optarg;
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break;
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default:
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return usage(prog);
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}
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}
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if (optind >= argc || optind + 2 < argc)
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return usage(prog);
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if (exec != NULL && label != NULL)
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return usage(prog);
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if (exec == NULL) {
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if (label == NULL)
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label = provider;
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if (label == NULL) {
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fprintf(stderr, "%s: Either a provider, a label or an exec command"
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" must be given\n", prog);
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return usage(prog);
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}
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exec = (char *)alloca(sizeof DEFAULT_EXEC_PREFIX + strlen(label));
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if (exec == NULL) {
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fprintf(stderr, "%s: Cannot allocate %d bytes\n", prog,
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(int)(sizeof DEFAULT_EXEC_PREFIX) + strlen(label));
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return EX_OSERR;
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}
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strcpy(exec, DEFAULT_EXEC_PREFIX);
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strcpy(exec + sizeof DEFAULT_EXEC_PREFIX - 1, label);
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}
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if (acname == NULL) {
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char *dot;
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if (gethostname(hostname, sizeof hostname))
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strcpy(hostname, "localhost");
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else if ((dot = strchr(hostname, '.')))
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*dot = '\0';
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acname = hostname;
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}
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#ifndef NOKLDLOAD
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if (!LoadModules())
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return EX_UNAVAILABLE;
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#endif
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/* Create a socket node */
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if (NgMkSockNode(NULL, &cs, &ds) == -1) {
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perror("Cannot create netgraph socket node");
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return EX_CANTCREAT;
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}
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/* Connect it up (and fill in `ngc') */
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if ((ret = ConfigureNode(prog, argv[optind], provider, cs, ds,
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optd, &ngc)) != 0) {
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close(cs);
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close(ds);
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return ret;
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}
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if (!optF && daemon(1, 0) == -1) {
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perror("daemon()");
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close(cs);
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close(ds);
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return EX_OSERR;
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}
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if (pidfile != NULL) {
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FILE *fp;
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if ((fp = fopen(pidfile, "w")) == NULL) {
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perror(pidfile);
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close(cs);
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close(ds);
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return EX_CANTCREAT;
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} else {
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fprintf(fp, "%d\n", (int)getpid());
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fclose(fp);
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}
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}
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openlog(prog, LOG_PID | (optF ? LOG_PERROR : 0), LOG_DAEMON);
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if (!optF && optn)
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NgSetErrLog(nglog, nglogx);
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memset(&act, '\0', sizeof act);
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act.sa_handler = Farewell;
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act.sa_flags = 0;
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sigemptyset(&act.sa_mask);
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sigaction(SIGHUP, &act, NULL);
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGQUIT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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while (!ReceivedSignal) {
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if (*provider)
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syslog(LOG_INFO, "Listening as provider %s", provider);
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else
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syslog(LOG_INFO, "Listening");
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switch (sz = NgRecvData(ds, response, sizeof response, rhook)) {
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case -1:
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syslog(LOG_INFO, "NgRecvData: %m");
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break;
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case 0:
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syslog(LOG_INFO, "NgRecvData: socket closed");
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break;
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default:
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if (optd) {
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char *dbuf, *ptr;
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ptr = dbuf = alloca(sz * 2 + 1);
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for (f = 0; f < sz; f++, ptr += 2)
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sprintf(ptr, "%02x", (u_char)response[f]);
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*ptr = '\0';
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syslog(LOG_INFO, "Got %d bytes of data: %s", sz, dbuf);
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}
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}
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if (sz <= 0) {
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ret = EX_UNAVAILABLE;
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break;
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}
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Spawn(prog, acname, provider, exec, ngc, cs, ds, response, sz, optd);
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}
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if (pidfile)
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remove(pidfile);
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if (ReceivedSignal) {
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syslog(LOG_INFO, "Received signal %d, exiting", ReceivedSignal);
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signal(ReceivedSignal, SIG_DFL);
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raise(ReceivedSignal);
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/* NOTREACHED */
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ret = -ReceivedSignal;
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}
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return ret;
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}
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