Welcome eigrpd

The eigrpd daemon will support the Enhanced Interior Gateway Routing Protocol.

Built using the imsg/three process framework and heavily based on ospfd(8), ospf6d(8) and ldpd(8).

The current status of eigrpd(8) is as follows:
* Almost full compliance with the specification: DUAL FSM, RTP, CR mode, SIA, etc
* Support for both IPv4 and IPv6
* Support for multiple instances (different ASes/AFs) within the same process
* Support for rdomains (one process per rdomain)
* RIB/FIB synchronization
* Basic redistribution support

Not implemented features (yet):
* Configuration reload support (partially implemented)
* Route summarization
* Advanced route redistribution/filtering
* Carp integration
* Authentication (draft is missing information)
* Stub (not released by Cisco)

Not yet connected to the builds.

ok deraadt@ claudio@

Makefile

@@ -0,0 +1,19 @@
+#	$OpenBSD$
+
+PROG=	eigrpd
+SRCS=	control.c eigrpd.c eigrpe.c hello.c in_cksum.c interface.c \
+	kroute.c log.c neighbor.c packet.c parse.y printconf.c query.c \
+	rde.c rde_dual.c reply.c rtp.c tlv.c update.c util.c
+
+MAN=	eigrpd.8 eigrpd.conf.5
+
+CFLAGS+= -Wall -I${.CURDIR}
+CFLAGS+= -Wstrict-prototypes -Wmissing-prototypes
+CFLAGS+= -Wmissing-declarations
+CFLAGS+= -Wshadow -Wpointer-arith -Wcast-qual
+CFLAGS+= -Wsign-compare
+YFLAGS=
+LDADD+=	-levent -lutil
+DPADD+= ${LIBEVENT} ${LIBUTIL}
+
+.include <bsd.prog.mk>

control.c

@@ -0,0 +1,315 @@
+/*	$OpenBSD$ */
+
+/*
+ * Copyright (c) 2003, 2004 Henning Brauer <[email protected]>
+ *
+ * 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 <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "eigrpd.h"
+#include "eigrp.h"
+#include "eigrpe.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 | 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, path, sizeof(sun.sun_path));
+
+	if (unlink(path) == -1)
+		if (errno != ENOENT) {
+			log_warn("%s: unlink %s", __func__, 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("%s: bind: %s", __func__, 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("%s: chmod", __func__);
+		close(fd);
+		(void)unlink(path);
+		return (-1);
+	}
+
+	control_state.fd = fd;
+
+	return (0);
+}
+
+int
+control_listen(void)
+{
+
+	if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
+		log_warn("%s: listen", __func__);
+		return (-1);
+	}
+
+	event_set(&control_state.ev, control_state.fd, EV_READ,
+	    control_accept, NULL);
+	event_add(&control_state.ev, NULL);
+	evtimer_set(&control_state.evt, control_accept, NULL);
+
+	return (0);
+}
+
+void
+control_cleanup(char *path)
+{
+	if (path == NULL)
+		return;
+	event_del(&control_state.ev);
+	event_del(&control_state.evt);
+	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;
+
+	event_add(&control_state.ev, NULL);
+	if ((event & EV_TIMEOUT))
+		return;
+
+	len = sizeof(sun);
+	if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
+	    SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
+		/*
+		 * Pause accept if we are out of file descriptors, or
+		 * libevent will haunt us here too.
+		 */
+		if (errno == ENFILE || errno == EMFILE) {
+			struct timeval evtpause = { 1, 0 };
+
+			event_del(&control_state.ev);
+			evtimer_add(&control_state.evt, &evtpause);
+		} 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("%s: calloc", __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);
+}
+
+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_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);
+
+	/* Some file descriptors are available again. */
+	if (evtimer_pending(&control_state.evt, NULL)) {
+		evtimer_del(&control_state.evt);
+		event_add(&control_state.ev, NULL);
+	}
+
+	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_warnx("%s: fd %d: not found", __func__, 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) <= 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;
+			eigrpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
+			break;
+		case IMSG_CTL_KROUTE:
+		case IMSG_CTL_IFINFO:
+			c->iev.ibuf.pid = imsg.hdr.pid;
+			eigrpe_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))
+				break;
+
+			memcpy(&ifidx, imsg.data, sizeof(ifidx));
+			eigrpe_iface_ctl(c, ifidx);
+			imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
+			    0, -1, NULL, 0);
+			break;
+		case IMSG_CTL_SHOW_TOPOLOGY:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE +
+			    sizeof(struct ctl_show_topology_req))
+				break;
+
+			c->iev.ibuf.pid = imsg.hdr.pid;
+			eigrpe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid,
+			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
+			break;
+		case IMSG_CTL_SHOW_NBR:
+			eigrpe_nbr_ctl(c);
+			break;
+		case IMSG_CTL_LOG_VERBOSE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE +
+			    sizeof(verbose))
+				break;
+
+			/* forward to other processes */
+			eigrpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
+			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
+			eigrpe_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("%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));
+}

control.h

@@ -0,0 +1,44 @@
+/*	$OpenBSD$ */
+
+/*
+ * Copyright (c) 2003, 2004 Henning Brauer <[email protected]>
+ *
+ * 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.
+ */
+
+#ifndef _CONTROL_H_
+#define	_CONTROL_H_
+
+#include <sys/queue.h>
+#include <sys/time.h>
+#include <event.h>
+
+struct {
+	struct event	ev;
+	struct event	evt;
+	int		fd;
+} control_state;
+
+struct ctl_conn {
+	TAILQ_ENTRY(ctl_conn)	entry;
+	struct imsgev		iev;
+};
+
+int	control_init(char *);
+int	control_listen(void);
+void	control_accept(int, short, void *);
+void	control_dispatch_imsg(int, short, void *);
+int	control_imsg_relay(struct imsg *);
+void	control_cleanup(char *);
+
+#endif	/* _CONTROL_H_ */