Welcome dvmrpd

started by Esben Norby some time ago by using the imsg/three process framework
of ospfd.
Right now it is not particularly useful, major parts are still missing but is
imported to allow more people to work on it.

Status:

The IGMP part is mostly complete, allowing clients to join and leave groups.
Election the IGMP querier of a network is also functional, only thing missing is
some corner cases when going from non-querier to querier.

About half of the DVMRP is functional, probes and route reports are functional.

Multicast streams can be detected and the MFC can be manipulated.
The RIB is not complete but operational.

Not yet connected to the builds.

OK claudio@

1 files changed, 297 insertions, 0 deletions

diff --git a/usr.sbin/dvmrpd/control.c b/usr.sbin/dvmrpd/control.c
new file mode 100644
index 00000000000..04664401437
--- /dev/null
+++ b/usr.sbin/dvmrpd/control.c
@@ -0,0 +1,297 @@
+/*	$OpenBSD: control.c,v 1.1 2006/06/01 14:12:20 norby 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 "igmp.h"
+#include "dvmrpd.h"
+#include "dvmrp.h"
+#include "dvmrpe.h"
+#include "log.h"
+#include "control.h"
+
+#define	CONTROL_BACKLOG	5
+
+int control_imsg_relay(struct imsg *imsg);
+
+struct ctl_conn	*control_connbyfd(int);
+struct ctl_conn	*control_connbypid(pid_t);
+void		 control_close(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_warn("control_init: socket");
+		return (-1);
+	}
+
+	bzero(&sun, sizeof(sun));
+	sun.sun_family = AF_UNIX;
+	strlcpy(sun.sun_path, DVMRPD_SOCKET, sizeof(sun.sun_path));
+
+	if (unlink(DVMRPD_SOCKET) == -1)
+		if (errno != ENOENT) {
+			log_warn("control_init: unlink %s", DVMRPD_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("control_init: bind: %s", DVMRPD_SOCKET);
+		close(fd);
+		umask(old_umask);
+		return (-1);
+	}
+	umask(old_umask);
+
+	if (chmod(DVMRPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
+		log_warn("control_init: chmod");
+		close(fd);
+		(void)unlink(DVMRPD_SOCKET);
+		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(void)
+{
+	unlink(DVMRPD_SOCKET);
+}
+
+/* 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");
+		return;
+	}
+
+	session_socket_blockmode(connfd, BM_NONBLOCK);
+
+	if ((c = malloc(sizeof(struct ctl_conn))) == NULL) {
+		log_warn("control_accept");
+		return;
+	}
+
+	imsg_init(&c->ibuf, connfd, control_dispatch_imsg);
+	c->ibuf.events = EV_READ;
+	event_set(&c->ibuf.ev, c->ibuf.fd, c->ibuf.events,
+	    c->ibuf.handler, &c->ibuf);
+	event_add(&c->ibuf.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->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->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);
+
+	msgbuf_clear(&c->ibuf.w);
+	TAILQ_REMOVE(&ctl_conns, c, entry);
+
+	event_del(&c->ibuf.ev);
+	close(c->ibuf.fd);
+	free(c);
+}
+
+/* ARGSUSED */
+void
+control_dispatch_imsg(int fd, short event, void *bula)
+{
+	struct ctl_conn	*c;
+	struct imsg	 imsg;
+	int		 n;
+	unsigned int	 ifidx;
+
+	if ((c = control_connbyfd(fd)) == NULL) {
+		log_warn("control_dispatch_imsg: fd %d: not found", fd);
+		return;
+	}
+
+	switch (event) {
+	case EV_READ:
+		if ((n = imsg_read(&c->ibuf)) <= 0) {
+			control_close(fd);
+			return;
+		}
+		break;
+	case EV_WRITE:
+		if (msgbuf_write(&c->ibuf.w) < 0) {
+			control_close(fd);
+			return;
+		}
+		imsg_event_add(&c->ibuf);
+		return;
+	default:
+		fatalx("unknown event");
+	}
+
+	for (;;) {
+		if ((n = imsg_get(&c->ibuf, &imsg)) == -1) {
+			control_close(fd);
+			return;
+		}
+
+		if (n == 0)
+			break;
+
+		switch (imsg.hdr.type) {
+		case IMSG_CTL_MFC_COUPLE:
+		case IMSG_CTL_MFC_DECOUPLE:
+		case IMSG_CTL_RELOAD:
+			dvmrpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
+			break;
+		case IMSG_CTL_SHOW_IFACE:
+			if (imsg.hdr.len == IMSG_HEADER_SIZE +
+			    sizeof(ifidx)) {
+				memcpy(&ifidx, imsg.data, sizeof(ifidx));
+				dvmrpe_iface_ctl(c, ifidx);
+				imsg_compose(&c->ibuf, IMSG_CTL_END, 0,
+				    0, NULL, 0);
+			}
+			break;
+		case IMSG_CTL_SHOW_IGMP:
+			if (imsg.hdr.len == IMSG_HEADER_SIZE +
+			    sizeof(ifidx)) {
+				memcpy(&ifidx, imsg.data, sizeof(ifidx));
+				dvmrpe_iface_igmp_ctl(c, ifidx);
+				imsg_compose(&c->ibuf, IMSG_CTL_END, 0,
+				    0, NULL, 0);
+			}
+			break;
+		case IMSG_CTL_SHOW_NBR:
+			dvmrpe_nbr_ctl(c);
+			break;
+		case IMSG_CTL_SHOW_RIB:
+		case IMSG_CTL_SHOW_MFC:
+		case IMSG_CTL_SHOW_SUM:
+			c->ibuf.pid = imsg.hdr.pid;
+			dvmrpe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid,
+			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
+			break;
+		default:
+			log_debug("control_dispatch_imsg: "
+			    "error handling imsg %d", imsg.hdr.type);
+			break;
+		}
+		imsg_free(&imsg);
+	}
+
+	imsg_event_add(&c->ibuf);
+}
+
+int
+control_imsg_relay(struct imsg *imsg)
+{
+	struct ctl_conn	*c;
+
+	if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
+		return (0);
+
+	return (imsg_compose(&c->ibuf, imsg->hdr.type, 0, imsg->hdr.pid,
+	    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("fnctl F_GETFL");
+
+	if (bm == BM_NONBLOCK)
+		flags |= O_NONBLOCK;
+	else
+		flags &= ~O_NONBLOCK;
+
+	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
+		fatal("fnctl F_SETFL");
+}