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|
/* $OpenBSD: control.c,v 1.32 2010/02/21 20:53:20 michele 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/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ospfd.h"
#include "ospf.h"
#include "ospfe.h"
#include "log.h"
#include "control.h"
#define CONTROL_BACKLOG 5
struct ctl_conn *control_connbyfd(int);
struct ctl_conn *control_connbypid(pid_t);
void control_close(int);
int
control_init(char *path)
{
struct sockaddr_un sun;
int fd;
mode_t old_umask;
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
log_warn("control_init: socket");
return (-1);
}
bzero(&sun, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
if (unlink(path) == -1)
if (errno != ENOENT) {
log_warn("control_init: unlink %s", path);
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("control_init: bind: %s", path);
close(fd);
umask(old_umask);
return (-1);
}
umask(old_umask);
if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
log_warn("control_init: chmod");
close(fd);
(void)unlink(path);
return (-1);
}
session_socket_blockmode(fd, BM_NONBLOCK);
control_state.fd = fd;
return (0);
}
int
control_listen(void)
{
if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
log_warn("control_listen: listen");
return (-1);
}
event_set(&control_state.ev, control_state.fd, EV_READ | EV_PERSIST,
control_accept, NULL);
event_add(&control_state.ev, NULL);
return (0);
}
void
control_cleanup(char *path)
{
if (path)
unlink(path);
}
/* ARGSUSED */
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 = accept(listenfd,
(struct sockaddr *)&sun, &len)) == -1) {
if (errno != EWOULDBLOCK && errno != EINTR)
log_warn("control_accept: accept");
return;
}
session_socket_blockmode(connfd, BM_NONBLOCK);
if ((c = malloc(sizeof(struct ctl_conn))) == NULL) {
log_warn("control_accept");
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);
}
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);
}
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);
}
void
control_close(int fd)
{
struct ctl_conn *c;
if ((c = control_connbyfd(fd)) == NULL) {
log_warn("control_close: fd %d: not found", fd);
return;
}
msgbuf_clear(&c->iev.ibuf.w);
TAILQ_REMOVE(&ctl_conns, c, entry);
event_del(&c->iev.ev);
close(c->iev.ibuf.fd);
free(c);
}
/* ARGSUSED */
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_warn("control_dispatch_imsg: fd %d: not found", fd);
return;
}
if (event & EV_READ) {
if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) {
control_close(fd);
return;
}
}
if (event & EV_WRITE) {
if (msgbuf_write(&c->iev.ibuf.w) == -1) {
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:
ospfe_fib_update(imsg.hdr.type);
/* FALLTHROUGH */
case IMSG_CTL_FIB_RELOAD:
case IMSG_CTL_RELOAD:
c->iev.ibuf.pid = imsg.hdr.pid;
ospfe_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;
ospfe_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));
ospfe_iface_ctl(c, ifidx);
imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
0, -1, NULL, 0);
}
break;
case IMSG_CTL_SHOW_DATABASE:
case IMSG_CTL_SHOW_DB_EXT:
case IMSG_CTL_SHOW_DB_NET:
case IMSG_CTL_SHOW_DB_RTR:
case IMSG_CTL_SHOW_DB_SELF:
case IMSG_CTL_SHOW_DB_SUM:
case IMSG_CTL_SHOW_DB_ASBR:
case IMSG_CTL_SHOW_RIB:
case IMSG_CTL_SHOW_SUM:
c->iev.ibuf.pid = imsg.hdr.pid;
ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
break;
case IMSG_CTL_SHOW_NBR:
ospfe_nbr_ctl(c);
break;
case IMSG_CTL_LOG_VERBOSE:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(verbose))
break;
/* forward to other processes */
ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
ospfe_imsg_compose_rde(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("control_dispatch_imsg: "
"error handling imsg %d", 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));
}
void
session_socket_blockmode(int fd, enum blockmodes bm)
{
int flags;
if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
fatal("fcntl F_GETFL");
if (bm == BM_NONBLOCK)
flags |= O_NONBLOCK;
else
flags &= ~O_NONBLOCK;
if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
fatal("fcntl F_SETFL");
}
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