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In case ntp cannot resolve a hostname on startup it will queue the entry

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for resolving by a child process that, upon success, will add the entry
to the config of the running running parent process.

Unfortunately there are a couple of bugs with this, fixed in various
later versions of upstream in potentially different ways due to other
code changes:

1) Upon server [-46] <FQDN> the [-46] are used as FQDN for later resolving
   which does not work.  Make sure we always pass the name (or IP there).

2) The intermediate file to carry the information to the child process
   does not know about -4/-6 restrictions, so that a dual-stacked host
   could resolve to an IPv6 address but that might be unreachable (see
   r223626) leading to no working synchronization ignoring a IPv4 record.
   Thus alter the intermediate format to also pass the address family
   (AF_UNSPEC (default), AF_INET or AF_INET6) to the child process
   depending on -4 or -6.

3) Make the child process to parse the new intermediate file format and
   save the address family for getaddrinfo() hints flags.

4) Change child to always reload resolv.conf calling res_init() before
   trying to resolve names.  This will pick up resolv.conf changes or
   new resolv.confs should they have not existed or been empty or
   unusable on ntp startup.  This fix is more conditional in upstream
   versions but given FreeBSD has res_init there is no need for the
   configure logic as well.

Approved by:	roberto
Sponsored by:	Sandvine Incorporated
MFC after:	9 days
This commit is contained in:
Bjoern A. Zeeb 2011-06-29 13:01:10 +00:00
parent 9527ec6e52
commit 2bddeb8538
2 changed files with 36 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
contrib/ntp/ntpd/ntp_config.c
View File

@ -414,7 +414,7 @@ enum gnn_type {
static int getnetnum P((const char *, struct sockaddr_storage *, int,
enum gnn_type));
static void save_resolve P((char *, int, int, int, int, u_int, int,
keyid_t, u_char *));
keyid_t, u_char *, u_char));
static void do_resolve_internal P((void));
static void abort_resolve P((void));
#if !defined(VMS) && !defined(SYS_WINNT)
@ -870,9 +870,9 @@ getconfig(
stoa(&peeraddr));
}
} else if (errflg == -1) {
save_resolve(tokens[1], hmode, peerversion,
save_resolve(tokens[istart - 1], hmode, peerversion,
minpoll, maxpoll, peerflags, ttl,
peerkey, peerkeystr);
peerkey, peerkeystr, peeraddr.ss_family);
}
break;
@ -2325,7 +2325,8 @@ save_resolve(
u_int flags,
int ttl,
keyid_t keyid,
u_char *keystr
u_char *keystr,
u_char peeraf
)
{
#ifndef SYS_VXWORKS
@ -2365,11 +2366,11 @@ save_resolve(
}
#endif
(void)fprintf(res_fp, "%s %d %d %d %d %d %d %u %s\n", name,
(void)fprintf(res_fp, "%s %u %d %d %d %d %d %d %u %s\n", name, peeraf,
mode, version, minpoll, maxpoll, flags, ttl, keyid, keystr);
#ifdef DEBUG
if (debug > 1)
printf("config: %s %d %d %d %d %x %d %u %s\n", name, mode,
printf("config: %s %u %d %d %d %d %x %d %u %s\n", name, peeraf, mode,
version, minpoll, maxpoll, flags, ttl, keyid, keystr);
#endif

43
contrib/ntp/ntpd/ntp_intres.c
View File

@ -29,6 +29,7 @@
#include <stdio.h>
#include <ctype.h>
#include <resolv.h>
#include <signal.h>
/**/
@ -111,15 +112,16 @@ static int resolve_value; /* next value of resolve timer */
* is supposed to consist of entries in the following order
*/
#define TOK_HOSTNAME 0
#define TOK_HMODE 1
#define TOK_VERSION 2
#define TOK_MINPOLL 3
#define TOK_MAXPOLL 4
#define TOK_FLAGS 5
#define TOK_TTL 6
#define TOK_KEYID 7
#define TOK_KEYSTR 8
#define NUMTOK 9
#define TOK_PEERAF 1
#define TOK_HMODE 2
#define TOK_VERSION 3
#define TOK_MINPOLL 4
#define TOK_MAXPOLL 5
#define TOK_FLAGS 6
#define TOK_TTL 7
#define TOK_KEYID 8
#define TOK_KEYSTR 9
#define NUMTOK 10
#define MAXLINESIZE 512
@ -140,7 +142,7 @@ char *req_file; /* name of the file with configuration info */
static void checkparent P((void));
static void removeentry P((struct conf_entry *));
static void addentry P((char *, int, int, int, int, u_int,
int, keyid_t, char *));
int, keyid_t, char *, u_char));
static int findhostaddr P((struct conf_entry *));
static void openntp P((void));
static int request P((struct conf_peer *));
@ -397,7 +399,8 @@ addentry(
u_int flags,
int ttl,
keyid_t keyid,
char *keystr
char *keystr,
u_char peeraf
)
{
register char *cp;
@ -407,7 +410,7 @@ addentry(
#ifdef DEBUG
if (debug > 1)
msyslog(LOG_INFO,
"intres: <%s> %d %d %d %d %x %d %x %s\n", name,
"intres: <%s> %u %d %d %d %d %x %d %x %s\n", name, peeraf,
mode, version, minpoll, maxpoll, flags, ttl, keyid,
keystr);
#endif
@ -422,6 +425,7 @@ addentry(
ce->ce_peeraddr6 = in6addr_any;
#endif
ANYSOCK(&ce->peer_store);
ce->peer_store.ss_family = peeraf; /* Save AF for getaddrinfo hints. */
ce->ce_hmode = (u_char)mode;
ce->ce_version = (u_char)version;
ce->ce_minpoll = (u_char)minpoll;
@ -482,7 +486,8 @@ findhostaddr(
entry->ce_name));
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_family = entry->peer_store.ss_family;
hints.ai_socktype = SOCK_DGRAM;
/*
* If the IPv6 stack is not available look only for IPv4 addresses
*/
@ -1051,6 +1056,13 @@ readconf(
}
}
if (intval[TOK_PEERAF] != AF_UNSPEC && intval[TOK_PEERAF] !=
AF_INET && intval[TOK_PEERAF] != AF_INET6) {
msyslog(LOG_ERR, "invalid peer address family (%u) in "
"file %s", intval[TOK_PEERAF], name);
exit(1);
}
if (intval[TOK_HMODE] != MODE_ACTIVE &&
intval[TOK_HMODE] != MODE_CLIENT &&
intval[TOK_HMODE] != MODE_BROADCAST) {
@ -1107,7 +1119,7 @@ readconf(
addentry(token[TOK_HOSTNAME], (int)intval[TOK_HMODE],
(int)intval[TOK_VERSION], (int)intval[TOK_MINPOLL],
(int)intval[TOK_MAXPOLL], flags, (int)intval[TOK_TTL],
intval[TOK_KEYID], token[TOK_KEYSTR]);
intval[TOK_KEYID], token[TOK_KEYSTR], (u_char)intval[TOK_PEERAF]);
}
}
@ -1129,6 +1141,9 @@ doconfigure(
dores ? "with" : "without" );
#endif
if (dores) /* Reload /etc/resolv.conf - bug 1226 */
res_init();
ce = confentries;
while (ce != NULL) {
#ifdef DEBUG