welcome, bgpd

started by me some time ago with moral support from theo, the proceeded up to
the point where the session engine worked correctly. claudio jeker joined
then and did a lot of work in the RDE.
it is not particulary usefull as application right now as parts are still
missing but is imported to enable more people to work on it.
status:
BGP sessions get established fine, OPEN messages and then KEEPALIVEs
exchanged etc. session FSM works fine; NOTIFICATIONs are handled fine, and
all connection drops etc I provoked get handled fine.
Incoming UPDATE messgages are parsed well and the data entered to the RIB,
the decision process is not yet there, neither is outgoing UPDATEs or sync
to the kernel routing table.

not connected to the builds yet.

1 files changed, 300 insertions, 0 deletions

diff --git a/usr.sbin/bgpd/log.c b/usr.sbin/bgpd/log.c
new file mode 100644
index 00000000000..6fbec30818e
--- /dev/null
+++ b/usr.sbin/bgpd/log.c
@@ -0,0 +1,300 @@
+/*	$OpenBSD: log.c,v 1.1 2003/12/17 11:46:54 henning Exp $ */
+
+/*
+ * Copyright (c) 2003 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/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "bgpd.h"
+#include "session.h"
+
+static const char *statenames[] = {
+	"None",
+	"Idle",
+	"Connect",
+	"Active",
+	"OpenSent",
+	"OpenConfirm",
+	"Established"
+};
+
+static const char *eventnames[] = {
+	"None",
+	"Start",
+	"Stop",
+	"Connection opened",
+	"Connection closed",
+	"Connection open failed",
+	"Fatal error",
+	"ConnectRetryTimer expired",
+	"HoldTimer expired",
+	"KeepaliveTimer expired",
+	"OPEN message received",
+	"KEEPALIVE message received",
+	"UPDATE message received",
+	"NOTIFICATION received"
+};
+
+static const char *errnames[] = {
+	"none",
+	"Header error",
+	"error in OPEN message",
+	"error in UPDATE message",
+	"HoldTimer expired",
+	"Finite State Machine error",
+	"Cease"
+};
+
+static const char *suberr_header_names[] = {
+	"none",
+	"synchronization error",
+	"wrong length",
+	"unknown message type"
+};
+
+static const char *suberr_open_names[] = {
+	"none",
+	"version mismatch",
+	"AS unacceptable",
+	"BGPID invalid",
+	"optional parameter error",
+	"Authentification error",
+	"unacceptable holdtime"
+};
+
+static const char *suberr_update_names[] = {
+	"none",
+	"attribute list error",
+	"unknown well-known attribute",
+	"well-known attribute missing",
+	"attribute flags error",
+	"attribute length wrong",
+	"origin unacceptable",
+	"loop detected",
+	"nexthop unacceptable",
+	"optional attribute error",
+	"network unacceptable",
+	"AS-Path unacceptable"
+};
+
+int	debug;
+
+char	*log_fmt_peer(struct peer *);
+
+char *
+log_fmt_peer(struct peer *peer)
+{
+	char		*ip;
+	char		*pfmt;
+
+	ip = inet_ntoa(peer->conf.remote_addr.sin_addr);
+	if (peer->conf.descr[0]) {
+		if (asprintf(&pfmt, "neighbor %s (%s)", ip, peer->conf.descr) ==
+		     -1)
+			fatal(NULL, errno);
+	} else {
+		if (asprintf(&pfmt, "neighbor %s", ip) == -1)
+			fatal(NULL, errno);
+	}
+	return (pfmt);
+}
+
+void
+log_init(int n_debug)
+{
+	debug = n_debug;
+
+	if (!debug)
+		openlog("bgpd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
+}
+
+void
+logit(int pri, const char *fmt, ...)
+{
+	va_list	ap;
+
+	va_start(ap, fmt);
+	vlog(pri, fmt, ap);
+	va_end(ap);
+}
+
+void
+vlog(int pri, const char *fmt, va_list ap)
+{
+	if (debug) {
+		vfprintf(stderr, fmt, ap);
+		fprintf(stderr, "\n");
+	} else
+		vsyslog(pri, fmt, ap);
+}
+
+
+void
+log_err(struct peer *peer, const char *emsg, ...)
+{
+	char	*p, *nfmt;
+	va_list	 ap;
+
+	p = log_fmt_peer(peer);
+	if (emsg == NULL) {
+		if (asprintf(&nfmt, "%s: %s", p, strerror(errno)) == -1)
+			fatal(NULL, errno);
+	} else {
+		if (asprintf(&nfmt, "%s: %s: %s", p, emsg, strerror(errno)) ==
+		    -1)
+			fatal(NULL, errno);
+	}
+	va_start(ap, emsg);
+	vlog(LOG_CRIT, nfmt, ap);
+	va_end(ap);
+	free (p);
+}
+
+void
+log_errx(struct peer *peer, const char *emsg, ...)
+{
+	char	*p, *nfmt;
+	va_list	 ap;
+
+	p = log_fmt_peer(peer);
+	if (asprintf(&nfmt, "%s: %s", p, emsg) == -1)
+		fatal(NULL, errno);
+	va_start(ap, emsg);
+	vlog(LOG_CRIT, nfmt, ap);
+	va_end(ap);
+	free (p);
+}
+
+void
+fatal(const char *emsg, int error)
+{
+	if (emsg == NULL)
+		logit(LOG_CRIT, "%s", strerror(error));
+	else
+		if (error)
+			logit(LOG_CRIT, "%s: %s", emsg, strerror(error));
+		else
+			logit(LOG_CRIT, "%s", emsg);
+
+	/* XXX check which process we are and notify others! */
+	sleep(10);
+	_exit (1);
+}
+
+void
+fatal_ensure(const char *file, int line, const char *cond)
+{
+	logit(LOG_CRIT, "ENSURE (%s) failed in file %s on line %d",
+	    cond, file, line);
+
+	/* XXX check which process we are and notify others! */
+	sleep(10);
+	_exit (1);
+}
+
+void
+log_statechange(struct peer *peer, enum session_state nstate,
+    enum session_events event)
+{
+	char	*p;
+
+	p = log_fmt_peer(peer);
+	logit(LOG_INFO, "%s: state change %s -> %s, reason: %s",
+	    p, statenames[peer->state], statenames[nstate], eventnames[event]);
+	free(p);
+}
+
+void
+log_notification(struct peer *peer, u_int8_t errcode, u_int8_t subcode,
+    u_char *data, u_int16_t datalen)
+{
+	char		*p;
+	const char	*suberrname = NULL;
+	int		 uk = 0;
+
+	p = log_fmt_peer(peer);
+	switch (errcode) {
+	case ERR_HEADER:
+		if (subcode > sizeof(suberr_header_names)/sizeof(char *))
+			uk = 1;
+		else
+			suberrname = suberr_header_names[subcode];
+		break;
+	case ERR_OPEN:
+		if (subcode > sizeof(suberr_open_names)/sizeof(char *))
+			uk = 1;
+		else
+			suberrname = suberr_open_names[subcode];
+		break;
+	case ERR_UPDATE:
+		if (subcode > sizeof(suberr_update_names)/sizeof(char *))
+			uk = 1;
+		else
+			suberrname = suberr_update_names[subcode];
+		break;
+	case ERR_HOLDTIMEREXPIRED:
+	case ERR_FSM:
+	case ERR_CEASE:
+		uk = 1;
+		break;
+	default:
+		logit(LOG_CRIT, "%s: received notification, unknown errcode %u, "
+		    "subcode %u", p, errcode, subcode);
+		free(p);
+		return;
+	}
+
+	if (uk)
+		logit(LOG_CRIT,
+		    "%s: received notification: %s, unknown subcode %u",
+		    p, errnames[errcode], subcode);
+	else {
+		if (suberrname == NULL)
+			logit(LOG_CRIT, "%s: received notification: %s",
+			    p, errnames[errcode]);
+		else
+			logit(LOG_CRIT, "%s: received notification: %s, %s",
+			    p, errnames[errcode], suberrname);
+	}
+	free(p);
+}
+
+void
+log_conn_attempt(struct peer *peer, struct in_addr remote)
+{
+	char *p;
+
+	if (peer == NULL)	/* connection from non-peer, drop */
+		logit(LOG_INFO, "connection from non-peer %s refused",
+			    inet_ntoa(remote));
+	else {
+		p = log_fmt_peer(peer);
+		logit(LOG_INFO, "Connection attempt from %s while session is in "
+		    "state %s", p, statenames[peer->state]);
+		free(p);
+	}
+}