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|
/* $OpenBSD: ldpe.c,v 1.30 2015/03/21 18:32:01 renato Exp $ */
/*
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2008 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 <net/if_types.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <fcntl.h>
#include <pwd.h>
#include <unistd.h>
#include <event.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include "ldp.h"
#include "ldpd.h"
#include "ldpe.h"
#include "lde.h"
#include "control.h"
#include "log.h"
extern struct nbr_id_head nbrs_by_id;
RB_PROTOTYPE(nbr_id_head, nbr, id_tree, nbr_id_compare)
void ldpe_sig_handler(int, short, void *);
void ldpe_shutdown(void);
struct ldpd_conf *leconf = NULL, *nconf;
struct imsgev *iev_main;
struct imsgev *iev_lde;
/* ARGSUSED */
void
ldpe_sig_handler(int sig, short event, void *bula)
{
switch (sig) {
case SIGINT:
case SIGTERM:
ldpe_shutdown();
/* NOTREACHED */
default:
fatalx("unexpected signal");
}
}
/* label distribution protocol engine */
pid_t
ldpe(struct ldpd_conf *xconf, int pipe_parent2ldpe[2], int pipe_ldpe2lde[2],
int pipe_parent2lde[2])
{
struct iface *iface;
struct tnbr *tnbr;
struct passwd *pw;
struct event ev_sigint, ev_sigterm;
struct sockaddr_in disc_addr, sess_addr;
pid_t pid;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
case 0:
break;
default:
return (pid);
}
leconf = xconf;
setproctitle("ldp engine");
ldpd_process = PROC_LDP_ENGINE;
/* create ldpd control socket outside chroot */
if (control_init() == -1)
fatalx("control socket setup failed");
/* create the discovery UDP socket */
disc_addr.sin_family = AF_INET;
disc_addr.sin_port = htons(LDP_PORT);
disc_addr.sin_addr.s_addr = INADDR_ANY;
if ((xconf->ldp_discovery_socket = socket(AF_INET,
SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
IPPROTO_UDP)) == -1)
fatal("error creating discovery socket");
if (if_set_reuse(xconf->ldp_discovery_socket, 1) == -1)
fatal("if_set_reuse");
if (bind(xconf->ldp_discovery_socket, (struct sockaddr *)&disc_addr,
sizeof(disc_addr)) == -1)
fatal("error binding discovery socket");
/* set some defaults */
if (if_set_mcast_ttl(xconf->ldp_discovery_socket,
IP_DEFAULT_MULTICAST_TTL) == -1)
fatal("if_set_mcast_ttl");
if (if_set_mcast_loop(xconf->ldp_discovery_socket) == -1)
fatal("if_set_mcast_loop");
if (if_set_tos(xconf->ldp_discovery_socket,
IPTOS_PREC_INTERNETCONTROL) == -1)
fatal("if_set_tos");
if (if_set_recvif(xconf->ldp_discovery_socket, 1) == -1)
fatal("if_set_recvif");
if_set_recvbuf(xconf->ldp_discovery_socket);
/* create the extended discovery UDP socket */
disc_addr.sin_family = AF_INET;
disc_addr.sin_port = htons(LDP_PORT);
disc_addr.sin_addr.s_addr = xconf->rtr_id.s_addr;
if ((xconf->ldp_ediscovery_socket = socket(AF_INET,
SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
IPPROTO_UDP)) == -1)
fatal("error creating extended discovery socket");
if (if_set_reuse(xconf->ldp_ediscovery_socket, 1) == -1)
fatal("if_set_reuse");
if (bind(xconf->ldp_ediscovery_socket, (struct sockaddr *)&disc_addr,
sizeof(disc_addr)) == -1)
fatal("error binding extended discovery socket");
/* set some defaults */
if (if_set_tos(xconf->ldp_ediscovery_socket,
IPTOS_PREC_INTERNETCONTROL) == -1)
fatal("if_set_tos");
if (if_set_recvif(xconf->ldp_ediscovery_socket, 1) == -1)
fatal("if_set_recvif");
if_set_recvbuf(xconf->ldp_ediscovery_socket);
/* create the session TCP socket */
sess_addr.sin_family = AF_INET;
sess_addr.sin_port = htons(LDP_PORT);
sess_addr.sin_addr.s_addr = INADDR_ANY;
if ((xconf->ldp_session_socket = socket(AF_INET,
SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
IPPROTO_TCP)) == -1)
fatal("error creating session socket");
if (if_set_reuse(xconf->ldp_session_socket, 1) == -1)
fatal("if_set_reuse");
if (bind(xconf->ldp_session_socket, (struct sockaddr *)&sess_addr,
sizeof(sess_addr)) == -1)
fatal("error binding session socket");
if (listen(xconf->ldp_session_socket, LDP_BACKLOG) == -1)
fatal("error in listen on session socket");
/* set some defaults */
if (if_set_tos(xconf->ldp_session_socket,
IPTOS_PREC_INTERNETCONTROL) == -1)
fatal("if_set_tos");
if ((pw = getpwnam(LDPD_USER)) == NULL)
fatal("getpwnam");
if (chroot(pw->pw_dir) == -1)
fatal("chroot");
if (chdir("/") == -1)
fatal("chdir(\"/\")");
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");
event_init();
accept_init();
/* setup signal handler */
signal_set(&ev_sigint, SIGINT, ldpe_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, ldpe_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
/* setup pipes */
close(pipe_parent2ldpe[0]);
close(pipe_ldpe2lde[1]);
close(pipe_parent2lde[0]);
close(pipe_parent2lde[1]);
if ((iev_lde = malloc(sizeof(struct imsgev))) == NULL ||
(iev_main = malloc(sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_lde->ibuf, pipe_ldpe2lde[0]);
iev_lde->handler = ldpe_dispatch_lde;
imsg_init(&iev_main->ibuf, pipe_parent2ldpe[1]);
iev_main->handler = ldpe_dispatch_main;
/* setup event handler */
iev_lde->events = EV_READ;
event_set(&iev_lde->ev, iev_lde->ibuf.fd, iev_lde->events,
iev_lde->handler, iev_lde);
event_add(&iev_lde->ev, NULL);
iev_main->events = EV_READ;
event_set(&iev_main->ev, iev_main->ibuf.fd, iev_main->events,
iev_main->handler, iev_main);
event_add(&iev_main->ev, NULL);
event_set(&leconf->disc_ev, leconf->ldp_discovery_socket,
EV_READ|EV_PERSIST, disc_recv_packet, NULL);
event_add(&leconf->disc_ev, NULL);
event_set(&leconf->edisc_ev, leconf->ldp_ediscovery_socket,
EV_READ|EV_PERSIST, disc_recv_packet, NULL);
event_add(&leconf->edisc_ev, NULL);
accept_add(leconf->ldp_session_socket, session_accept, NULL);
/* listen on ldpd control socket */
TAILQ_INIT(&ctl_conns);
control_listen();
if ((pkt_ptr = calloc(1, IBUF_READ_SIZE)) == NULL)
fatal("ldpe");
/* initialize interfaces */
LIST_FOREACH(iface, &leconf->iface_list, entry)
if_init(xconf, iface);
/* start configured targeted neighbors */
LIST_FOREACH(tnbr, &leconf->tnbr_list, entry)
tnbr_init(xconf, tnbr);
event_dispatch();
ldpe_shutdown();
/* NOTREACHED */
return (0);
}
void
ldpe_shutdown(void)
{
struct iface *iface;
struct tnbr *tnbr;
/* stop all interfaces */
while ((iface = LIST_FIRST(&leconf->iface_list)) != NULL) {
LIST_REMOVE(iface, entry);
if_del(iface);
}
/* stop all targeted neighbors */
while ((tnbr = LIST_FIRST(&leconf->tnbr_list)) != NULL) {
LIST_REMOVE(tnbr, entry);
tnbr_del(tnbr);
}
close(leconf->ldp_discovery_socket);
close(leconf->ldp_ediscovery_socket);
close(leconf->ldp_session_socket);
/* clean up */
msgbuf_write(&iev_lde->ibuf.w);
msgbuf_clear(&iev_lde->ibuf.w);
free(iev_lde);
msgbuf_write(&iev_main->ibuf.w);
msgbuf_clear(&iev_main->ibuf.w);
free(iev_main);
free(leconf);
free(pkt_ptr);
log_info("ldp engine exiting");
_exit(0);
}
/* imesg */
int
ldpe_imsg_compose_parent(int type, pid_t pid, void *data, u_int16_t datalen)
{
return (imsg_compose_event(iev_main, type, 0, pid, -1, data, datalen));
}
int
ldpe_imsg_compose_lde(int type, u_int32_t peerid, pid_t pid,
void *data, u_int16_t datalen)
{
return (imsg_compose_event(iev_lde, type, peerid, pid, -1,
data, datalen));
}
/* ARGSUSED */
void
ldpe_dispatch_main(int fd, short event, void *bula)
{
struct imsg imsg;
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
struct iface *iface = NULL;
struct if_addr *if_addr = NULL, *a;
struct kif *kif;
struct kaddr *kaddr;
int n, shut = 0;
struct nbr *nbr;
if (event & EV_READ) {
if ((n = imsg_read(ibuf)) == -1)
fatal("imsg_read error");
if (n == 0) /* connection closed */
shut = 1;
}
if (event & EV_WRITE) {
if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
fatal("ldpe_dispatch_main: msgbuf_write");
if (n == 0)
shut = 1;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("ldpe_dispatch_main: imsg_read error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_IFSTATUS:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct kif))
fatalx("IFINFO imsg with wrong len");
kif = imsg.data;
iface = if_lookup(kif->ifindex);
if (!iface)
break;
iface->flags = kif->flags;
iface->linkstate = kif->link_state;
if_update(iface);
break;
case IMSG_NEWADDR:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct kaddr))
fatalx("NEWADDR imsg with wrong len");
kaddr = imsg.data;
if ((if_addr = calloc(1, sizeof(*if_addr))) == NULL)
fatal("ldpe_dispatch_main");
if_addr->addr.s_addr = kaddr->addr.s_addr;
if_addr->mask.s_addr = kaddr->mask.s_addr;
if_addr->dstbrd.s_addr = kaddr->dstbrd.s_addr;
LIST_INSERT_HEAD(&leconf->addr_list, if_addr,
global_entry);
RB_FOREACH(nbr, nbr_id_head, &nbrs_by_id) {
if (nbr->state != NBR_STA_OPER)
continue;
send_address(nbr, if_addr);
}
iface = if_lookup(kaddr->ifindex);
if (iface) {
LIST_INSERT_HEAD(&iface->addr_list, if_addr,
iface_entry);
if_update(iface);
}
break;
case IMSG_DELADDR:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct kaddr))
fatalx("DELADDR imsg with wrong len");
kaddr = imsg.data;
LIST_FOREACH(a, &leconf->addr_list, global_entry)
if (a->addr.s_addr == kaddr->addr.s_addr &&
a->mask.s_addr == kaddr->mask.s_addr &&
a->dstbrd.s_addr == kaddr->dstbrd.s_addr)
break;
if_addr = a;
if (!if_addr)
break;
LIST_REMOVE(if_addr, global_entry);
iface = if_lookup(kaddr->ifindex);
if (iface) {
LIST_REMOVE(if_addr, iface_entry);
if_update(iface);
}
RB_FOREACH(nbr, nbr_id_head, &nbrs_by_id) {
if (nbr->state != NBR_STA_OPER)
continue;
send_address_withdraw(nbr, if_addr);
}
free(if_addr);
break;
case IMSG_RECONF_CONF:
break;
case IMSG_RECONF_IFACE:
break;
case IMSG_RECONF_END:
break;
case IMSG_CTL_KROUTE:
case IMSG_CTL_KROUTE_ADDR:
case IMSG_CTL_IFINFO:
case IMSG_CTL_END:
control_imsg_relay(&imsg);
break;
default:
log_debug("ldpe_dispatch_main: error handling imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handler */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
/* ARGSUSED */
void
ldpe_dispatch_lde(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
struct imsg imsg;
struct map map;
struct notify_msg nm;
int n, shut = 0;
struct nbr *nbr = NULL;
if (event & EV_READ) {
if ((n = imsg_read(ibuf)) == -1)
fatal("imsg_read error");
if (n == 0) /* connection closed */
shut = 1;
}
if (event & EV_WRITE) {
if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
fatal("ldpe_dispatch_lde: msgbuf_write");
if (n == 0)
shut = 1;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("ldpe_dispatch_lde: imsg_read error");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_MAPPING_ADD:
case IMSG_RELEASE_ADD:
case IMSG_REQUEST_ADD:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(map))
fatalx("invalid size of map request");
memcpy(&map, imsg.data, sizeof(map));
nbr = nbr_find_peerid(imsg.hdr.peerid);
if (nbr == NULL) {
log_debug("ldpe_dispatch_lde: cannot find "
"neighbor");
return;
}
if (nbr->state != NBR_STA_OPER)
return;
switch (imsg.hdr.type) {
case IMSG_MAPPING_ADD:
nbr_mapping_add(nbr, &nbr->mapping_list, &map);
break;
case IMSG_RELEASE_ADD:
nbr_mapping_add(nbr, &nbr->release_list, &map);
break;
case IMSG_REQUEST_ADD:
nbr_mapping_add(nbr, &nbr->request_list, &map);
break;
}
break;
case IMSG_MAPPING_ADD_END:
case IMSG_RELEASE_ADD_END:
case IMSG_REQUEST_ADD_END:
nbr = nbr_find_peerid(imsg.hdr.peerid);
if (nbr == NULL) {
log_debug("ldpe_dispatch_lde: cannot find "
"neighbor");
return;
}
if (nbr->state != NBR_STA_OPER)
return;
switch (imsg.hdr.type) {
case IMSG_MAPPING_ADD_END:
send_labelmessage(nbr, MSG_TYPE_LABELMAPPING,
&nbr->mapping_list);
break;
case IMSG_RELEASE_ADD_END:
send_labelmessage(nbr, MSG_TYPE_LABELRELEASE,
&nbr->release_list);
break;
case IMSG_REQUEST_ADD_END:
send_labelmessage(nbr, MSG_TYPE_LABELREQUEST,
&nbr->request_list);
break;
}
break;
case IMSG_NOTIFICATION_SEND:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(nm))
fatalx("invalid size of OE request");
memcpy(&nm, imsg.data, sizeof(nm));
nbr = nbr_find_peerid(imsg.hdr.peerid);
if (nbr == NULL) {
log_debug("ldpe_dispatch_lde: cannot find "
"neighbor");
return;
}
if (nbr->state != NBR_STA_OPER)
return;
send_notification_nbr(nbr, nm.status,
htonl(nm.messageid), htonl(nm.type));
break;
case IMSG_CTL_END:
case IMSG_CTL_SHOW_LIB:
control_imsg_relay(&imsg);
break;
default:
log_debug("ldpe_dispatch_lde: error handling imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handler */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
u_int32_t
ldpe_router_id(void)
{
return (leconf->rtr_id.s_addr);
}
void
ldpe_iface_ctl(struct ctl_conn *c, unsigned int idx)
{
struct iface *iface;
struct ctl_iface *ictl;
LIST_FOREACH(iface, &leconf->iface_list, entry) {
if (idx == 0 || idx == iface->ifindex) {
ictl = if_to_ctl(iface);
imsg_compose_event(&c->iev,
IMSG_CTL_SHOW_INTERFACE,
0, 0, -1, ictl, sizeof(struct ctl_iface));
}
}
}
|