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/* $OpenBSD: control.c,v 1.11 2004/01/06 03:43:50 henning 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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bgpd.h"
#include "session.h"
#define CONTROL_BACKLOG 5
struct {
int fd;
} control_state;
struct ctl_conn *control_connbyfd(int);
int
control_init(void)
{
struct sockaddr_un sun;
int fd;
mode_t old_umask;
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
log_err("control_init: socket");
return (-1);
}
old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
bzero(&sun, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, SOCKET_NAME, sizeof(sun.sun_path));
if (unlink(SOCKET_NAME) == -1)
if (errno != ENOENT) {
log_err("unlink %s", SOCKET_NAME);
return (-1);
}
if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
log_err("control_init: bind: %s", SOCKET_NAME);
return (-1);
}
if (chmod(SOCKET_NAME, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
log_err("control_init chmod");
return (-1);
}
umask(old_umask);
control_state.fd = fd;
return (fd);
}
int
control_listen(void)
{
if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
log_err("control_listen: listen");
return (-1);
}
return (control_state.fd);
}
void
control_shutdown(void)
{
close(control_state.fd);
}
void
control_cleanup(void)
{
unlink(SOCKET_NAME);
}
void
control_accept(int listenfd)
{
int connfd;
socklen_t len;
struct sockaddr_un sun;
uid_t uid;
gid_t gid;
struct ctl_conn *ctl_conn;
len = sizeof(sun);
if ((connfd = accept(listenfd,
(struct sockaddr *)&sun, &len)) == -1) {
if (errno == EWOULDBLOCK || errno == EINTR)
return;
else
log_err("session_control_accept");
}
if (getpeereid(connfd, &uid, &gid) == -1) {
log_err("session_control_accept");
return;
}
if (uid) {
log_err("Connection to control socket with uid %ld", uid);
return;
}
if ((ctl_conn = malloc(sizeof(struct ctl_conn))) == NULL) {
log_err("session_control_accept");
return;
}
imsg_init(&ctl_conn->ibuf, connfd);
TAILQ_INSERT_TAIL(&ctl_conns, ctl_conn, entries);
}
struct ctl_conn *
control_connbyfd(int fd)
{
struct ctl_conn *c;
for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.sock != fd;
c = TAILQ_NEXT(c, entries))
; /* nothing */
return (c);
}
void
control_close(int fd)
{
struct ctl_conn *c;
if ((c = control_connbyfd(fd)) == NULL) {
log_err("control_close: fd %d: not found", fd);
return;
}
TAILQ_REMOVE(&ctl_conns, c, entries);
close(c->ibuf.sock);
free(c);
}
int
control_dispatch_msg(struct pollfd *pfd, int i)
{
struct imsg imsg;
struct ctl_conn *c;
int n;
struct peer *p;
struct bgpd_addr *addr;
if ((c = control_connbyfd(pfd->fd)) == NULL) {
log_err("control_dispatch_msg: fd %d: not found", pfd->fd);
return (0);
}
if (imsg_read(&c->ibuf) <= 0) {
control_close(pfd->fd);
return (1);
}
for (;;) {
if ((n = imsg_get(&c->ibuf, &imsg)) == -1) {
control_close(pfd->fd);
return (1);
}
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_SHOW_NEIGHBOR:
if (imsg.hdr.len == IMSG_HEADER_SIZE +
sizeof(struct bgpd_addr)) {
addr = imsg.data;
p = getpeerbyip(addr->v4.s_addr);
if (p != NULL)
imsg_compose(&c->ibuf,
IMSG_CTL_SHOW_NEIGHBOR,
0, p, sizeof(struct peer));
} else
for (p = peers; p != NULL; p = p->next)
imsg_compose(&c->ibuf,
IMSG_CTL_SHOW_NEIGHBOR,
0, p, sizeof(struct peer));
imsg_compose(&c->ibuf, IMSG_CTL_END, 0, NULL, 0);
break;
case IMSG_CTL_RELOAD:
case IMSG_CTL_FIB_COUPLE:
case IMSG_CTL_FIB_DECOUPLE:
imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
break;
default:
break;
}
imsg_free(&imsg);
}
return (0);
}
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