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/* $OpenBSD: rde.c,v 1.2 2006/06/01 21:47:27 claudio Exp $ */
/*
* Copyright (c) 2004, 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2005, 2006 Esben Norby <norby@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <pwd.h>
#include <unistd.h>
#include <event.h>
#include "igmp.h"
#include "dvmrp.h"
#include "dvmrpd.h"
#include "dvmrpe.h"
#include "log.h"
#include "rde.h"
void rde_sig_handler(int sig, short, void *);
void rde_shutdown(void);
void rde_dispatch_imsg(int, short, void *);
volatile sig_atomic_t rde_quit = 0;
struct dvmrpd_conf *rdeconf = NULL;
struct imsgbuf *ibuf_dvmrpe;
struct imsgbuf *ibuf_main;
void
rde_sig_handler(int sig, short event, void *arg)
{
/*
* signal handler rules don't apply, libevent decouples for us
*/
switch (sig) {
case SIGINT:
case SIGTERM:
rde_shutdown();
/* NOTREACHED */
default:
fatalx("unexpected signal");
}
}
/* route decision engine */
pid_t
rde(struct dvmrpd_conf *xconf, int pipe_parent2rde[2], int pipe_dvmrpe2rde[2],
int pipe_parent2dvmrpe[2])
{
struct passwd *pw;
struct event ev_sigint, ev_sigterm;
pid_t pid;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
case 0:
break;
default:
return (pid);
}
rdeconf = xconf;
if ((pw = getpwnam(DVMRPD_USER)) == NULL)
fatal("getpwnam");
if (chroot(pw->pw_dir) == -1)
fatal("chroot");
if (chdir("/") == -1)
fatal("chdir(\"/\")");
setproctitle("route decision engine");
dvmrpd_process = PROC_RDE_ENGINE;
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
fatal("can't drop privileges");
endpwent();
event_init();
/* setup signal handler */
signal_set(&ev_sigint, SIGINT, rde_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, rde_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
/* setup pipes */
close(pipe_dvmrpe2rde[0]);
close(pipe_parent2rde[0]);
close(pipe_parent2dvmrpe[0]);
close(pipe_parent2dvmrpe[1]);
if ((ibuf_dvmrpe = malloc(sizeof(struct imsgbuf))) == NULL ||
(ibuf_main = malloc(sizeof(struct imsgbuf))) == NULL)
fatal(NULL);
imsg_init(ibuf_dvmrpe, pipe_dvmrpe2rde[1], rde_dispatch_imsg);
imsg_init(ibuf_main, pipe_parent2rde[1], rde_dispatch_imsg);
/* setup event handler */
ibuf_dvmrpe->events = EV_READ;
event_set(&ibuf_dvmrpe->ev, ibuf_dvmrpe->fd, ibuf_dvmrpe->events,
ibuf_dvmrpe->handler, ibuf_dvmrpe);
event_add(&ibuf_dvmrpe->ev, NULL);
ibuf_main->events = EV_READ;
event_set(&ibuf_main->ev, ibuf_main->fd, ibuf_main->events,
ibuf_main->handler, ibuf_main);
event_add(&ibuf_main->ev, NULL);
rt_init();
mfc_init();
event_dispatch();
rde_shutdown();
/* NOTREACHED */
return (0);
}
void
rde_shutdown(void)
{
struct iface *iface;
rt_clear();
mfc_clear();
LIST_FOREACH(iface, &rdeconf->iface_list, entry) {
if_del(iface);
}
msgbuf_clear(&ibuf_dvmrpe->w);
free(ibuf_dvmrpe);
msgbuf_clear(&ibuf_main->w);
free(ibuf_main);
free(rdeconf);
log_info("route decision engine exiting");
_exit(0);
}
/* imesg */
int
rde_imsg_compose_parent(int type, pid_t pid, void *data, u_int16_t datalen)
{
return (imsg_compose(ibuf_main, type, 0, pid, data, datalen));
}
int
rde_imsg_compose_dvmrpe(int type, u_int32_t peerid, pid_t pid, void *data,
u_int16_t datalen)
{
return (imsg_compose(ibuf_dvmrpe, type, peerid, pid, data, datalen));
}
void
rde_dispatch_imsg(int fd, short event, void *bula)
{
struct mfc mfc;
struct imsgbuf *ibuf = bula;
struct imsg imsg;
struct route_report rr;
int n, connected = 0;
int i;
struct iface *iface;
switch (event) {
case EV_READ:
if ((n = imsg_read(ibuf)) == -1)
fatal("imsg_read error");
if (n == 0) /* connection closed */
fatalx("pipe closed");
break;
case EV_WRITE:
if (msgbuf_write(&ibuf->w) == -1)
fatal("msgbuf_write");
imsg_event_add(ibuf);
return;
default:
fatalx("unknown event");
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("rde_dispatch_imsg: imsg_read error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_SHOW_RIB:
rt_dump(imsg.hdr.pid);
imsg_compose(ibuf_dvmrpe, IMSG_CTL_END, 0, imsg.hdr.pid,
NULL, 0);
break;
case IMSG_CTL_SHOW_MFC:
mfc_dump(imsg.hdr.pid);
imsg_compose(ibuf_dvmrpe, IMSG_CTL_END, 0, imsg.hdr.pid,
NULL, 0);
break;
case IMSG_ROUTE_REPORT:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(rr))
fatalx("invalid size of OE request");
memcpy(&rr, imsg.data, sizeof(rr));
/* directly connected networks from parent */
if (imsg.hdr.peerid == 0) {
connected = 1;
}
rt_update(rr.net, mask2prefixlen(rr.mask.s_addr),
rr.nexthop, rr.metric, rr.adv_rtr, rr.ifindex, 0,
connected);
break;
case IMSG_FULL_ROUTE_REPORT:
rt_snap(imsg.hdr.peerid);
rde_imsg_compose_dvmrpe(IMSG_FULL_ROUTE_REPORT_END,
imsg.hdr.peerid, 0, NULL, 0);
break;
case IMSG_MFC_ADD:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(mfc))
fatalx("invalid size of OE request");
memcpy(&mfc, imsg.data, sizeof(mfc));
#if 1
for (i = 0; i < MAXVIFS; i++)
mfc.ttls[i] = 0;
LIST_FOREACH(iface, &rdeconf->iface_list, entry) {
if (mfc.ifindex != iface->ifindex)
mfc.ttls[iface->ifindex] = 1;
}
mfc_update(&mfc);
#endif
break;
case IMSG_MFC_DEL:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(mfc))
fatalx("invalid size of OE request");
memcpy(&mfc, imsg.data, sizeof(mfc));
#if 1
mfc_delete(&mfc);
#endif
break;
default:
log_debug("rde_dispatch_msg: unexpected imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
imsg_event_add(ibuf);
}
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