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netstat: reduce use of historical Internet classes

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When attempting to characterize bound addresses, netstat was checking
for host 0 on a (historical) net using inet_lnaof().  Such addresses
are not normally bound, as they would not work, with the exception
of the unspecified address, INADDR_ANY.  Check for that explicitly.
Similarly, don't check bound addresses for a match to a network name.

(cherry picked from commit bd27c71c45)
This commit is contained in:
Mike Karels 2021-10-26 22:39:10 -05:00
parent e5d4e532a0
commit 2cd55edbb2
1 changed files with 6 additions and 17 deletions
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23
usr.bin/netstat/inet.c
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@ -296,14 +296,14 @@ protopr(u_long off, const char *name, int af1, int proto)
(
(istcp && tp->t_state == TCPS_LISTEN)
|| (af1 == AF_INET &&
inet_lnaof(inp->inp_laddr) == INADDR_ANY)
inp->inp_laddr.s_addr == INADDR_ANY)
#ifdef INET6
|| (af1 == AF_INET6 &&
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
#endif /* INET6 */
|| (af1 == AF_UNSPEC &&
(((inp->inp_vflag & INP_IPV4) != 0 &&
inet_lnaof(inp->inp_laddr) == INADDR_ANY)
inp->inp_laddr.s_addr == INADDR_ANY)
#ifdef INET6
|| ((inp->inp_vflag & INP_IPV6) != 0 &&
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
@ -1471,24 +1471,13 @@ inetname(struct in_addr *inp)
char *cp;
static char line[MAXHOSTNAMELEN];
struct hostent *hp;
struct netent *np;
cp = 0;
if (!numeric_addr && inp->s_addr != INADDR_ANY) {
int net = inet_netof(*inp);
int lna = inet_lnaof(*inp);
if (lna == INADDR_ANY) {
np = getnetbyaddr(net, AF_INET);
if (np)
cp = np->n_name;
}
if (cp == NULL) {
hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
if (hp) {
cp = hp->h_name;
trimdomain(cp, strlen(cp));
}
hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
if (hp) {
cp = hp->h_name;
trimdomain(cp, strlen(cp));
}
}
if (inp->s_addr == INADDR_ANY)