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|
/* $OpenBSD: ospfd.c,v 1.38 2006/12/21 17:22:29 claudio Exp $ */
/*
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004 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 <sys/time.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <event.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include "ospfd.h"
#include "ospf.h"
#include "ospfe.h"
#include "control.h"
#include "log.h"
#include "rde.h"
void main_sig_handler(int, short, void *);
__dead void usage(void);
void ospfd_shutdown(void);
int check_child(pid_t, const char *);
void main_dispatch_ospfe(int, short, void *);
void main_dispatch_rde(int, short, void *);
int check_file_secrecy(int, const char *);
void ospf_redistribute_default(int);
int pipe_parent2ospfe[2];
int pipe_parent2rde[2];
int pipe_ospfe2rde[2];
struct ospfd_conf *conf = NULL;
struct imsgbuf *ibuf_ospfe;
struct imsgbuf *ibuf_rde;
pid_t ospfe_pid = 0;
pid_t rde_pid = 0;
/* ARGSUSED */
void
main_sig_handler(int sig, short event, void *arg)
{
/*
* signal handler rules don't apply, libevent decouples for us
*/
int die = 0;
switch (sig) {
case SIGTERM:
case SIGINT:
die = 1;
/* FALLTHROUGH */
case SIGCHLD:
if (check_child(ospfe_pid, "ospf engine")) {
ospfe_pid = 0;
die = 1;
}
if (check_child(rde_pid, "route decision engine")) {
rde_pid = 0;
die = 1;
}
if (die)
ospfd_shutdown();
break;
case SIGHUP:
/* reconfigure */
/* ... */
break;
default:
fatalx("unexpected signal");
/* NOTREACHED */
}
}
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-dnv] [-f file]\n", __progname);
exit(1);
}
int
main(int argc, char *argv[])
{
struct event ev_sigint, ev_sigterm, ev_sigchld, ev_sighup;
char *conffile;
int ch, opts = 0;
int debug = 0;
int ipforwarding;
int mib[4];
size_t len;
conffile = CONF_FILE;
ospfd_process = PROC_MAIN;
while ((ch = getopt(argc, argv, "df:nv")) != -1) {
switch (ch) {
case 'd':
debug = 1;
break;
case 'f':
conffile = optarg;
break;
case 'n':
opts |= OSPFD_OPT_NOACTION;
break;
case 'v':
if (opts & OSPFD_OPT_VERBOSE)
opts |= OSPFD_OPT_VERBOSE2;
opts |= OSPFD_OPT_VERBOSE;
break;
default:
usage();
/* NOTREACHED */
}
}
/* start logging */
log_init(debug);
mib[0] = CTL_NET;
mib[1] = PF_INET;
mib[2] = IPPROTO_IP;
mib[3] = IPCTL_FORWARDING;
len = sizeof(ipforwarding);
if (sysctl(mib, 4, &ipforwarding, &len, NULL, 0) == -1)
err(1, "sysctl");
if (!ipforwarding)
log_warnx("WARNING: IP forwarding NOT enabled");
/* fetch interfaces early */
kif_init();
/* parse config file */
if ((conf = parse_config(conffile, opts)) == NULL )
exit(1);
if (conf->opts & OSPFD_OPT_NOACTION) {
if (conf->opts & OSPFD_OPT_VERBOSE)
print_config(conf);
else
fprintf(stderr, "configuration OK\n");
exit(0);
}
/* check for root privileges */
if (geteuid())
errx(1, "need root privileges");
/* check for ospfd user */
if (getpwnam(OSPFD_USER) == NULL)
errx(1, "unknown user %s", OSPFD_USER);
if (!debug)
daemon(1, 0);
log_info("startup");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC,
pipe_parent2ospfe) == -1)
fatal("socketpair");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_parent2rde) == -1)
fatal("socketpair");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_ospfe2rde) == -1)
fatal("socketpair");
session_socket_blockmode(pipe_parent2ospfe[0], BM_NONBLOCK);
session_socket_blockmode(pipe_parent2ospfe[1], BM_NONBLOCK);
session_socket_blockmode(pipe_parent2rde[0], BM_NONBLOCK);
session_socket_blockmode(pipe_parent2rde[1], BM_NONBLOCK);
session_socket_blockmode(pipe_ospfe2rde[0], BM_NONBLOCK);
session_socket_blockmode(pipe_ospfe2rde[1], BM_NONBLOCK);
/* start children */
rde_pid = rde(conf, pipe_parent2rde, pipe_ospfe2rde, pipe_parent2ospfe);
ospfe_pid = ospfe(conf, pipe_parent2ospfe, pipe_ospfe2rde,
pipe_parent2rde);
/* show who we are */
setproctitle("parent");
event_init();
/* setup signal handler */
signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
signal_set(&ev_sigchld, SIGCHLD, main_sig_handler, NULL);
signal_set(&ev_sighup, SIGHUP, main_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sigchld, NULL);
signal_add(&ev_sighup, NULL);
/* setup pipes to children */
close(pipe_parent2ospfe[1]);
close(pipe_parent2rde[1]);
close(pipe_ospfe2rde[0]);
close(pipe_ospfe2rde[1]);
if ((ibuf_ospfe = malloc(sizeof(struct imsgbuf))) == NULL ||
(ibuf_rde = malloc(sizeof(struct imsgbuf))) == NULL)
fatal(NULL);
imsg_init(ibuf_ospfe, pipe_parent2ospfe[0], main_dispatch_ospfe);
imsg_init(ibuf_rde, pipe_parent2rde[0], main_dispatch_rde);
/* setup event handler */
ibuf_ospfe->events = EV_READ;
event_set(&ibuf_ospfe->ev, ibuf_ospfe->fd, ibuf_ospfe->events,
ibuf_ospfe->handler, ibuf_ospfe);
event_add(&ibuf_ospfe->ev, NULL);
ibuf_rde->events = EV_READ;
event_set(&ibuf_rde->ev, ibuf_rde->fd, ibuf_rde->events,
ibuf_rde->handler, ibuf_rde);
event_add(&ibuf_rde->ev, NULL);
if (kr_init(!(conf->flags & OSPFD_FLAG_NO_FIB_UPDATE)) == -1)
fatalx("kr_init failed");
/* redistribute default */
ospf_redistribute_default(IMSG_NETWORK_ADD);
event_dispatch();
ospfd_shutdown();
/* NOTREACHED */
return (0);
}
void
ospfd_shutdown(void)
{
struct area *a;
pid_t pid;
if (ospfe_pid)
kill(ospfe_pid, SIGTERM);
if (rde_pid)
kill(rde_pid, SIGTERM);
while ((a = LIST_FIRST(&conf->area_list)) != NULL) {
LIST_REMOVE(a, entry);
area_del(a);
}
control_cleanup();
kr_shutdown();
do {
if ((pid = wait(NULL)) == -1 &&
errno != EINTR && errno != ECHILD)
fatal("wait");
} while (pid != -1 || (pid == -1 && errno == EINTR));
msgbuf_clear(&ibuf_ospfe->w);
free(ibuf_ospfe);
msgbuf_clear(&ibuf_rde->w);
free(ibuf_rde);
free(conf);
log_info("terminating");
exit(0);
}
int
check_child(pid_t pid, const char *pname)
{
int status;
if (waitpid(pid, &status, WNOHANG) > 0) {
if (WIFEXITED(status)) {
log_warnx("lost child: %s exited", pname);
return (1);
}
if (WIFSIGNALED(status)) {
log_warnx("lost child: %s terminated; signal %d",
pname, WTERMSIG(status));
return (1);
}
}
return (0);
}
/* imsg handling */
/* ARGSUSED */
void
main_dispatch_ospfe(int fd, short event, void *bula)
{
struct imsgbuf *ibuf = bula;
struct imsg imsg;
ssize_t n;
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("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_RELOAD:
/* XXX reconfig */
break;
case IMSG_CTL_FIB_COUPLE:
kr_fib_couple();
break;
case IMSG_CTL_FIB_DECOUPLE:
kr_fib_decouple();
break;
case IMSG_CTL_KROUTE:
case IMSG_CTL_KROUTE_ADDR:
kr_show_route(&imsg);
break;
case IMSG_CTL_IFINFO:
if (imsg.hdr.len == IMSG_HEADER_SIZE)
kr_ifinfo(NULL, imsg.hdr.pid);
else if (imsg.hdr.len == IMSG_HEADER_SIZE + IFNAMSIZ)
kr_ifinfo(imsg.data, imsg.hdr.pid);
else
log_warnx("IFINFO request with wrong len");
break;
default:
log_debug("main_dispatch_ospfe: error handling imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
imsg_event_add(ibuf);
}
/* ARGSUSED */
void
main_dispatch_rde(int fd, short event, void *bula)
{
struct imsgbuf *ibuf = bula;
struct imsg imsg;
ssize_t n;
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("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_KROUTE_CHANGE:
if (kr_change(imsg.data))
log_warn("main_dispatch_rde: error changing "
"route");
break;
case IMSG_KROUTE_DELETE:
if (kr_delete(imsg.data))
log_warn("main_dispatch_rde: error deleting "
"route");
break;
default:
log_debug("main_dispatch_rde: error handling imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
imsg_event_add(ibuf);
}
void
main_imsg_compose_ospfe(int type, pid_t pid, void *data, u_int16_t datalen)
{
imsg_compose(ibuf_ospfe, type, 0, pid, data, datalen);
}
void
main_imsg_compose_rde(int type, pid_t pid, void *data, u_int16_t datalen)
{
imsg_compose(ibuf_rde, type, 0, pid, data, datalen);
}
int
check_file_secrecy(int fd, const char *fname)
{
struct stat st;
if (fstat(fd, &st)) {
warn("cannot stat %s", fname);
return (-1);
}
if (st.st_uid != 0 && st.st_uid != getuid()) {
warnx("%s: owner not root or current user", fname);
return (-1);
}
if (st.st_mode & (S_IRWXG | S_IRWXO)) {
warnx("%s: group/world readable/writeable", fname);
return (-1);
}
return (0);
}
/* this needs to be added here so that ospfctl can be used without libevent */
void
imsg_event_add(struct imsgbuf *ibuf)
{
ibuf->events = EV_READ;
if (ibuf->w.queued)
ibuf->events |= EV_WRITE;
event_del(&ibuf->ev);
event_set(&ibuf->ev, ibuf->fd, ibuf->events, ibuf->handler, ibuf);
event_add(&ibuf->ev, NULL);
}
int
ospf_redistribute(struct kroute *kr, u_int32_t *metric)
{
struct redistribute *r;
/* stub area router? */
if ((conf->options & OSPF_OPTION_E) == 0)
return (0);
/* only allow 0.0.0.0/0 via REDISTRIBUTE_DEFAULT */
if (kr->prefix.s_addr == INADDR_ANY && kr->prefixlen == 0)
return (0);
SIMPLEQ_FOREACH(r, &conf->redist_list, entry) {
switch (r->type & ~REDIST_NO) {
case REDIST_LABEL:
if (kr->rtlabel == r->label)
return (r->type & REDIST_NO ? 0 : 1);
break;
case REDIST_STATIC:
/*
* Dynamic routes are not redistributable. Placed here
* so that link local addresses can be redistributed
* via a rtlabel.
*/
if (kr->flags & F_DYNAMIC)
continue;
if (kr->flags & F_STATIC) {
*metric = r->metric;
return (r->type & REDIST_NO ? 0 : 1);
}
break;
case REDIST_CONNECTED:
if (kr->flags & F_DYNAMIC)
continue;
if (kr->flags & F_CONNECTED) {
*metric = r->metric;
return (r->type & REDIST_NO ? 0 : 1);
}
break;
case REDIST_ADDR:
if (kr->flags & F_DYNAMIC)
continue;
if ((kr->prefix.s_addr & r->mask.s_addr) ==
(r->addr.s_addr & r->mask.s_addr) &&
kr->prefixlen >= mask2prefixlen(r->mask.s_addr)) {
*metric = r->metric;
return (r->type & REDIST_NO? 0 : 1);
}
break;
}
}
return (0);
}
void
ospf_redistribute_default(int type)
{
struct rroute rr;
if (!(conf->redistribute & REDISTRIBUTE_DEFAULT))
return;
bzero(&rr, sizeof(rr));
rr.metric = conf->defaultmetric;
main_imsg_compose_rde(type, 0, &rr, sizeof(struct rroute));
}
|