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/* $OpenBSD: control.c,v 1.27 2016/05/23 19:20:55 renato Exp $ */
/*
* 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/stat.h>
#include <sys/un.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "control.h"
#define CONTROL_BACKLOG 5
static void control_accept(int, short, void *);
static struct ctl_conn *control_connbyfd(int);
static struct ctl_conn *control_connbypid(pid_t);
static void control_close(int);
static void control_dispatch_imsg(int, short, void *);
struct ctl_conns ctl_conns;
static int control_fd;
int
control_init(void)
{
struct sockaddr_un sun;
int fd;
mode_t old_umask;
if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
0)) == -1) {
log_warn("%s: socket", __func__);
return (-1);
}
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, LDPD_SOCKET, sizeof(sun.sun_path));
if (unlink(LDPD_SOCKET) == -1)
if (errno != ENOENT) {
log_warn("%s: unlink %s", __func__, LDPD_SOCKET);
close(fd);
return (-1);
}
old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
log_warn("%s: bind: %s", __func__, LDPD_SOCKET);
close(fd);
umask(old_umask);
return (-1);
}
umask(old_umask);
if (chmod(LDPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
log_warn("%s: chmod", __func__);
close(fd);
(void)unlink(LDPD_SOCKET);
return (-1);
}
control_fd = fd;
return (0);
}
int
control_listen(void)
{
if (listen(control_fd, CONTROL_BACKLOG) == -1) {
log_warn("%s: listen", __func__);
return (-1);
}
return (accept_add(control_fd, control_accept, NULL));
}
void
control_cleanup(void)
{
accept_del(control_fd);
close(control_fd);
unlink(LDPD_SOCKET);
}
/* ARGSUSED */
static void
control_accept(int listenfd, short event, void *bula)
{
int connfd;
socklen_t len;
struct sockaddr_un sun;
struct ctl_conn *c;
len = sizeof(sun);
if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
SOCK_NONBLOCK | SOCK_CLOEXEC)) == -1) {
/*
* Pause accept if we are out of file descriptors, or
* libevent will haunt us here too.
*/
if (errno == ENFILE || errno == EMFILE)
accept_pause();
else if (errno != EWOULDBLOCK && errno != EINTR &&
errno != ECONNABORTED)
log_warn("%s: accept4", __func__);
return;
}
if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
log_warn(__func__);
close(connfd);
return;
}
imsg_init(&c->iev.ibuf, connfd);
c->iev.handler = control_dispatch_imsg;
c->iev.events = EV_READ;
event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
c->iev.handler, &c->iev);
event_add(&c->iev.ev, NULL);
TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
}
static struct ctl_conn *
control_connbyfd(int fd)
{
struct ctl_conn *c;
for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd;
c = TAILQ_NEXT(c, entry))
; /* nothing */
return (c);
}
static struct ctl_conn *
control_connbypid(pid_t pid)
{
struct ctl_conn *c;
for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid;
c = TAILQ_NEXT(c, entry))
; /* nothing */
return (c);
}
static void
control_close(int fd)
{
struct ctl_conn *c;
if ((c = control_connbyfd(fd)) == NULL) {
log_warnx("%s: fd %d: not found", __func__, fd);
return;
}
msgbuf_clear(&c->iev.ibuf.w);
TAILQ_REMOVE(&ctl_conns, c, entry);
event_del(&c->iev.ev);
close(c->iev.ibuf.fd);
accept_unpause();
free(c);
}
/* ARGSUSED */
static void
control_dispatch_imsg(int fd, short event, void *bula)
{
struct ctl_conn *c;
struct imsg imsg;
ssize_t n;
unsigned int ifidx;
int verbose;
if ((c = control_connbyfd(fd)) == NULL) {
log_warnx("%s: fd %d: not found", __func__, fd);
return;
}
if (event & EV_READ) {
if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
n == 0) {
control_close(fd);
return;
}
}
if (event & EV_WRITE) {
if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
control_close(fd);
return;
}
}
for (;;) {
if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
control_close(fd);
return;
}
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_FIB_COUPLE:
case IMSG_CTL_FIB_DECOUPLE:
case IMSG_CTL_RELOAD:
c->iev.ibuf.pid = imsg.hdr.pid;
ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
break;
case IMSG_CTL_KROUTE:
case IMSG_CTL_KROUTE_ADDR:
case IMSG_CTL_IFINFO:
c->iev.ibuf.pid = imsg.hdr.pid;
ldpe_imsg_compose_parent(imsg.hdr.type,
imsg.hdr.pid, imsg.data,
imsg.hdr.len - IMSG_HEADER_SIZE);
break;
case IMSG_CTL_SHOW_INTERFACE:
if (imsg.hdr.len == IMSG_HEADER_SIZE +
sizeof(ifidx)) {
memcpy(&ifidx, imsg.data, sizeof(ifidx));
ldpe_iface_ctl(c, ifidx);
imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
0, -1, NULL, 0);
}
break;
case IMSG_CTL_SHOW_DISCOVERY:
ldpe_adj_ctl(c);
break;
case IMSG_CTL_SHOW_LIB:
case IMSG_CTL_SHOW_L2VPN_PW:
case IMSG_CTL_SHOW_L2VPN_BINDING:
c->iev.ibuf.pid = imsg.hdr.pid;
ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
break;
case IMSG_CTL_SHOW_NBR:
ldpe_nbr_ctl(c);
break;
case IMSG_CTL_CLEAR_NBR:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(struct ctl_nbr))
break;
nbr_clear_ctl(imsg.data);
break;
case IMSG_CTL_LOG_VERBOSE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(verbose))
break;
/* forward to other processes */
ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
memcpy(&verbose, imsg.data, sizeof(verbose));
log_verbose(verbose);
break;
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
imsg_event_add(&c->iev);
}
int
control_imsg_relay(struct imsg *imsg)
{
struct ctl_conn *c;
if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
return (0);
return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
-1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
}
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