do not try to getaddrinfo() in the unprivileged process, send an imsg

asking the privileged one to do it. sends back an imsg with the
resulting addresses in a bunch of struct sockaddr_storage in the data
part.
this should fix all remaining issues with dns (non-)availability at
ntpd startup, be it due to named on localhost or something else.
tested by marco@ and Chris Paul <chris.paul@sentinare.com>

src/usr.sbin/ntpd/client.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: client.c,v 1.29 2004/07/28 16:38:43 henning Exp $ */
+/*	$OpenBSD: client.c,v 1.30 2004/08/12 16:33:59 henning Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -30,14 +30,25 @@ int	client_update(struct ntp_peer *);
 
 int
 client_peer_init(struct ntp_peer *p)
+{
+	if ((p->query = calloc(1, sizeof(struct ntp_query))) == NULL)
+		fatal("client_query calloc");
+	p->query->fd = -1;
+	p->query->msg.status = MODE_CLIENT | (NTP_VERSION << 3);
+	p->state = STATE_NONE;
+	p->shift = 0;
+	p->trustlevel = TRUSTLEVEL_PATHETIC;
+
+	return (client_addr_init(p));
+}
+
+int
+client_addr_init(struct ntp_peer *p)
 {
 	struct sockaddr_in	*sa_in;
 	struct sockaddr_in6	*sa_in6;
 	struct ntp_addr		*h;
 
-	if ((p->query = calloc(1, sizeof(struct ntp_query))) == NULL)
-		fatal("client_query calloc");
-
 	for (h = p->addr; h != NULL; h = h->next) {
 		switch (h->ss.ss_family) {
 		case AF_INET:
@@ -51,7 +62,7 @@ client_peer_init(struct ntp_peer *p)
 				sa_in6->sin6_port = htons(123);
 			break;
 		default:
-			fatal("king bula sez: wrong AF in client_peer_init");
+			fatal("king bula sez: wrong AF in client_addr_init");
 			/* not reached */
 		}
 	}
@@ -60,11 +71,7 @@ client_peer_init(struct ntp_peer *p)
 	    (p->query->fd = socket(p->addr->ss.ss_family, SOCK_DGRAM, 0)) == -1)
 		fatal("client_query socket");
 
-	p->query->msg.status = MODE_CLIENT | (NTP_VERSION << 3);
-	p->state = STATE_NONE;
 	p->next = time(NULL);
-	p->shift = 0;
-	p->trustlevel = TRUSTLEVEL_PATHETIC;
 
 	return (0);
 }
@@ -75,12 +82,8 @@ client_nextaddr(struct ntp_peer *p)
 	close(p->query->fd);
 
 	if (p->addr_head.a == NULL) {
-		if (host_dns(p->addr_head.name, &p->addr_head.a) > 0) {
-			p->addr = p->addr_head.a;
-			p->shift = 0;
-			p->trustlevel = TRUSTLEVEL_PATHETIC;
-		} else
-			return (-1);
+		ntp_host_dns(p->addr_head.name, p->id);
+		return (-1);
 	}
 
 	if ((p->addr = p->addr->next) == NULL)

src/usr.sbin/ntpd/config.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: config.c,v 1.10 2004/08/10 12:41:15 henning Exp $ */
+/*	$OpenBSD: config.c,v 1.11 2004/08/12 16:33:59 henning Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -124,6 +124,7 @@ host_dns(const char *s, struct ntp_addr **hn)
 	bzero(&hints, sizeof(hints));
 	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
+	res_init();	/* XXX */
 	error = getaddrinfo(s, NULL, &hints, &res0);
 	if (error) {
 		log_warnx("could not parse \"%s\": %s", s,

src/usr.sbin/ntpd/ntp.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntp.c,v 1.25 2004/07/18 12:59:41 henning Exp $ */
+/*	$OpenBSD: ntp.c,v 1.26 2004/08/12 16:33:59 henning Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -245,6 +245,10 @@ ntp_dispatch_imsg(void)
 {
 	struct imsg		 imsg;
 	int			 n;
+	struct ntp_peer		*peer, *npeer;
+	u_int16_t		 dlen;
+	u_char			*p;
+	struct ntp_addr		*h;
 
 	if ((n = imsg_read(&ibuf_main)) == -1)
 		return (-1);
@@ -262,6 +266,47 @@ ntp_dispatch_imsg(void)
 			break;
 
 		switch (imsg.hdr.type) {
+		case IMSG_HOST_DNS:
+			TAILQ_FOREACH(peer, &conf->ntp_peers, entry)
+				if (peer->id == imsg.hdr.peerid)
+					break;
+			if (peer == NULL)
+				fatal("IMSG_HOST_DNS with invalid peerID");
+			if (peer->addr != NULL) {
+				log_warnx("IMSG_HOST_DNS but addr != NULL!");
+				break;
+			}
+			dlen = imsg.hdr.len - IMSG_HEADER_SIZE;
+			p = (u_char *)imsg.data;
+			while (dlen >= sizeof(struct sockaddr_storage)) {
+				if ((h = calloc(1, sizeof(struct ntp_addr))) ==
+				    NULL)
+					fatal(NULL);
+				memcpy(&h->ss, p, sizeof(h->ss));
+				p += sizeof(h->ss);
+				dlen -= sizeof(h->ss);
+				if (peer->addr_head.pool) {
+					npeer = new_peer();
+					h->next = NULL;
+					npeer->addr = h;
+					npeer->addr_head.a = h;
+					client_peer_init(npeer);
+					TAILQ_INSERT_TAIL(&conf->ntp_peers,
+					    npeer, entry);
+				} else {
+					h->next = peer->addr;
+					peer->addr = h;
+					peer->addr_head.a = peer->addr;
+				}
+			}
+			if (dlen != 0)
+				fatal("IMSG_HOST_DNS: dlen != 0");
+			if (peer->addr_head.pool) {
+				TAILQ_REMOVE(&conf->ntp_peers, peer, entry);
+				free(peer);
+			} else
+				client_addr_init(peer);
+			break;
 		default:
 			break;
 		}
@@ -300,3 +345,12 @@ ntp_adjtime(void)
 	TAILQ_FOREACH(p, &conf->ntp_peers, entry)
 		p->update.good = 0;
 }
+
+void
+ntp_host_dns(char *name, u_int32_t peerid)
+{
+	u_int16_t	dlen;
+
+	dlen = strlen(name) + 1;
+	imsg_compose(&ibuf_main, IMSG_HOST_DNS, peerid, name, dlen);
+}

src/usr.sbin/ntpd/ntpd.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntpd.c,v 1.13 2004/07/13 11:16:22 henning Exp $ */
+/*	$OpenBSD: ntpd.c,v 1.14 2004/08/12 16:33:59 henning Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -213,8 +213,11 @@ int
 dispatch_imsg(void)
 {
 	struct imsg		 imsg;
-	int			 n;
+	int			 n, cnt;
 	double			 d;
+	char			*name;
+	struct ntp_addr		*h, *hn;
+	struct buf		*buf;
 
 	if ((n = imsg_read(&ibuf)) == -1)
 		return (-1);
@@ -237,6 +240,23 @@ dispatch_imsg(void)
 				fatal("invalid IMSG_ADJTIME received");
 			memcpy(&d, imsg.data, sizeof(d));
 			ntpd_adjtime(d);
+			break;
+		case IMSG_HOST_DNS:
+			name = imsg.data;
+			if (imsg.hdr.len != strlen(name) + 1 + IMSG_HEADER_SIZE)
+				fatal("invalid IMSG_HOST_DNS received");
+			if ((cnt = host_dns(name, &hn)) > 0) {
+				buf = imsg_create(&ibuf, IMSG_HOST_DNS,
+				    imsg.hdr.peerid,
+				    cnt * sizeof(struct sockaddr_storage));
+				if (buf == NULL)
+					break;
+				for (h = hn; h != NULL; h = h->next) {
+					imsg_add(buf, &h->ss, sizeof(h->ss));
+				}
+				imsg_close(&ibuf, buf);
+			}
+			break;
 		default:
 			break;
 		}

src/usr.sbin/ntpd/ntpd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntpd.h,v 1.32 2004/08/10 12:41:15 henning Exp $ */
+/*	$OpenBSD: ntpd.h,v 1.33 2004/08/12 16:33:59 henning Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -150,7 +150,8 @@ struct imsgbuf {
 
 enum imsg_type {
 	IMSG_NONE,
-	IMSG_ADJTIME
+	IMSG_ADJTIME,
+	IMSG_HOST_DNS
 };
 
 struct imsg_hdr {
@@ -201,6 +202,7 @@ void	 imsg_free(struct imsg *);
 /* ntp.c */
 pid_t	 ntp_main(int[2], struct ntpd_conf *);
 void	 ntp_adjtime(void);
+void	 ntp_host_dns(char *, u_int32_t);
 
 /* parse.y */
 int	 parse_config(char *, struct ntpd_conf *);
@@ -222,6 +224,7 @@ int	server_dispatch(int, struct ntpd_conf *);
 
 /* client.c */
 int	client_peer_init(struct ntp_peer *);
+int	client_addr_init(struct ntp_peer *);
 int	client_nextaddr(struct ntp_peer *);
 int	client_query(struct ntp_peer *);
 int	client_dispatch(struct ntp_peer *);