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

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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
This commit is contained in:
Doug Ambrisko 2004-04-30 22:34:12 +00:00
parent 33c5911242
commit 41b0ee744a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=128782
2 changed files with 32 additions and 6 deletions
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12
sbin/ifconfig/ifconfig.c
View File

@ -417,7 +417,7 @@ main(int argc, char *argv[])
{
int c;
int all, namesonly, downonly, uponly;
int need_nl = 0;
int need_nl = 0, count = 0;
const struct afswtch *afp = 0;
int addrcount, ifindex;
struct if_msghdr *ifm, *nextifm;
@ -543,6 +543,7 @@ main(int argc, char *argv[])
afp = NULL; /* not a family, NULL */
}
retry:
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
@ -558,8 +559,15 @@ main(int argc, char *argv[])
errx(1, "iflist-sysctl-estimate");
if ((buf = malloc(needed)) == NULL)
errx(1, "malloc");
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");
free(buf);
sleep(1);
goto retry;
}
errx(1, "actual retrieval of interface table");
}
lim = buf + needed;
next = buf;

26
sbin/route/route.c
View File

@ -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;