For both ifconfig and route if we didn't get enough memory from the

prior sysctl due to the structure growing between calls try again.

Also try again for deleting routes if things fail.  We've seen
route -f fail this way which does not actually flush all routes.
This fixes it.  It will whine but it will do the work.

PR:		56732
Obtained from:	IronPort

1 files changed, 22 insertions, 4 deletions

diff --git a/sbin/route/route.c b/sbin/route/route.c
index deb9d20..10fbee6 100644
--- a/sbin/route/route.c
+++ b/sbin/route/route.c
@@ -201,7 +201,7 @@ flushroutes(argc, argv)
 	char *argv[];
 {
 	size_t needed;
-	int mib[6], rlen, seqno;
+	int mib[6], rlen, seqno, count = 0;
 	char *buf, *next, *lim;
 	struct rt_msghdr *rtm;
 
@@ -232,6 +232,7 @@ flushroutes(argc, argv)
 		} else
 bad:			usage(*argv);
 	}
+retry:
 	mib[0] = CTL_NET;
 	mib[1] = PF_ROUTE;
 	mib[2] = 0;		/* protocol */
@@ -242,8 +243,15 @@ bad:			usage(*argv);
 		err(EX_OSERR, "route-sysctl-estimate");
 	if ((buf = malloc(needed)) == NULL)
 		errx(EX_OSERR, "malloc failed");
-	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+		if (errno == ENOMEM && count++ < 10) {
+			warnx("Routing table grew, retrying");  
+			sleep(1);
+			free(buf);
+			goto retry;
+		}
 		err(EX_OSERR, "route-sysctl-get");
+	}
 	lim = buf + needed;
 	if (verbose)
 		(void) printf("Examining routing table from sysctl\n");
@@ -268,6 +276,8 @@ bad:			usage(*argv);
 		if (rlen < (int)rtm->rtm_msglen) {
 			warn("write to routing socket");
 			(void) printf("got only %d for rlen\n", rlen);
+			free(buf);
+			goto retry;
 			break;
 		}
 		seqno++;
@@ -1105,9 +1115,10 @@ interfaces()
 {
 	size_t needed;
 	int mib[6];
-	char *buf, *lim, *next;
+	char *buf, *lim, *next, count = 0;
 	struct rt_msghdr *rtm;
 
+retry2:
 	mib[0] = CTL_NET;
 	mib[1] = PF_ROUTE;
 	mib[2] = 0;		/* protocol */
@@ -1118,8 +1129,15 @@ interfaces()
 		err(EX_OSERR, "route-sysctl-estimate");
 	if ((buf = malloc(needed)) == NULL)
 		errx(EX_OSERR, "malloc failed");
-	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+		if (errno == ENOMEM && count++ < 10) {
+			warnx("Routing table grew, retrying");
+			sleep(1);
+			free(buf);
+			goto retry2;
+		}
 		err(EX_OSERR, "actual retrieval of interface table");
+	}
 	lim = buf + needed;
 	for (next = buf; next < lim; next += rtm->rtm_msglen) {
 		rtm = (struct rt_msghdr *)next;