[src/trunk]: src/usr.bin/netstat use sysctl to print multicast addresses

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d0ac7b721233
branches:  trunk
changeset: 346481:d0ac7b721233
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Jul 14 18:19:11 2016 +0000

description:
use sysctl to print multicast addresses

diffstat:

 usr.bin/netstat/if.c   |  136 ++++++++++++++++++++++++++++++++++++++++++------
 usr.bin/netstat/main.c |    5 +-
 2 files changed, 119 insertions(+), 22 deletions(-)

diffs (221 lines):

diff -r ea26aabe8a65 -r d0ac7b721233 usr.bin/netstat/if.c
--- a/usr.bin/netstat/if.c      Thu Jul 14 18:18:16 2016 +0000
+++ b/usr.bin/netstat/if.c      Thu Jul 14 18:19:11 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if.c,v 1.84 2016/07/13 22:01:12 christos Exp $ */
+/*     $NetBSD: if.c,v 1.85 2016/07/14 18:19:11 christos Exp $ */
 
 /*
  * Copyright (c) 1983, 1988, 1993
@@ -34,7 +34,7 @@
 #if 0
 static char sccsid[] = "from: @(#)if.c 8.2 (Berkeley) 2/21/94";
 #else
-__RCSID("$NetBSD: if.c,v 1.84 2016/07/13 22:01:12 christos Exp $");
+__RCSID("$NetBSD: if.c,v 1.85 2016/07/14 18:19:11 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -84,8 +84,8 @@
 };
 
 static void set_lines(void);
-static void print_addr(struct sockaddr *, struct sockaddr **, struct if_data *,
-    struct ifnet *);
+static void print_addr(const char *, struct sockaddr *, struct sockaddr **,
+    struct if_data *, struct ifnet *);
 static void sidewaysintpr(u_int, u_long);
 
 static void iftot_banner(struct iftot *);
@@ -266,7 +266,7 @@
                        n = 5;
 
                printf("%-*.*s %-5" PRIu64 " ", n, n, name, ifd->ifi_mtu);
-               print_addr(rti_info[rtax], rti_info, ifd, NULL);
+               print_addr(name, rti_info[rtax], rti_info, ifd, NULL);
        }
 }
 
@@ -348,7 +348,8 @@
                        cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
                            CP(&ifaddr);
                        sa = (struct sockaddr *)cp;
-                       print_addr(sa, (void *)&ifaddr, &ifnet.if_data, &ifnet);
+                       print_addr(name, sa, (void *)&ifaddr, &ifnet.if_data,
+                           &ifnet);
                }
                ifaddraddr = (u_long)ifaddr.ifa.ifa_list.tqe_next;
        }
@@ -379,8 +380,110 @@
 }
 
 static void
-print_addr(struct sockaddr *sa, struct sockaddr **rtinfo, struct if_data *ifd,
-    struct ifnet *ifnet)
+mc6_print(const char *ifname)
+{
+       static const size_t incr =
+           2 * sizeof(struct in6_addr) + sizeof(uint32_t);
+       static int mcast_oids[4];
+       static int oifindex = -1;
+       uint8_t *mcast_addrs, *p;
+       size_t len;
+       int ifindex;
+
+       if ((ifindex = if_nametoindex(ifname)) == 0)
+               warn("Interface %s not found", ifname);
+
+       if (ifindex == oifindex)
+               return;
+       oifindex = ifindex;
+
+       if (mcast_oids[0] == 0) {
+               size_t oidlen = __arraycount(mcast_oids);
+               if (sysctlnametomib("net.inet6.multicast", mcast_oids,
+                   &oidlen) == -1) {
+                       warnx("net.inet6.multicast not found");
+                       return;
+               }
+               if (oidlen != 3) {
+                       warnx("Wrong OID path for net.inet6.multicast");
+                       return;
+               }
+       }
+       mcast_oids[3] = ifindex;
+
+       mcast_addrs = asysctl(mcast_oids, 4, &len);
+       if (mcast_addrs == NULL && len != 0) {
+               warn("failed to read net.inet6.multicast");
+               return;
+       }
+       if (len) {
+               p = mcast_addrs;
+               while (len >= incr) {
+                       ia6_print((void *)(p + sizeof(struct in6_addr)));
+                       p += incr;
+                       len -= incr;
+               }
+       }
+       free(mcast_addrs);
+}
+
+static void
+ia4_print(const struct in_addr *ia)
+{
+       printf("\n%25s %-17.17s ", "", routename4(ia->s_addr, nflag));
+}
+
+static void
+mc4_print(const char *ifname)
+{
+       static const size_t incr =
+           2 * sizeof(struct in_addr) + sizeof(uint32_t);
+       static int mcast_oids[4];
+       static int oifindex = -1;
+       uint8_t *mcast_addrs, *p;
+       size_t len;
+       int ifindex;
+
+       if ((ifindex = if_nametoindex(ifname)) == 0)
+               warn("Interface %s not found", ifname);
+
+       if (ifindex == oifindex)
+               return;
+       oifindex = ifindex;
+
+       if (mcast_oids[0] == 0) {
+               size_t oidlen = __arraycount(mcast_oids);
+               if (sysctlnametomib("net.inet.multicast", mcast_oids,
+                   &oidlen) == -1) {
+                       warnx("net.inet.multicast not found");
+                       return;
+               }
+               if (oidlen != 3) {
+                       warnx("Wrong OID path for net.inet.multicast");
+                       return;
+               }
+       }
+       mcast_oids[3] = ifindex;
+
+       mcast_addrs = asysctl(mcast_oids, 4, &len);
+       if (mcast_addrs == NULL && len != 0) {
+               warn("failed to read net.inet6.multicast");
+               return;
+       }
+       if (len) {
+               p = mcast_addrs;
+               while (len >= incr) {
+                       ia4_print((void *)(p + sizeof(struct in_addr)));
+                       p += incr;
+                       len -= incr;
+               }
+       }
+       free(mcast_addrs);
+}
+
+static void
+print_addr(const char *name, struct sockaddr *sa, struct sockaddr **rtinfo,
+    struct if_data *ifd, struct ifnet *ifnet)
 {
        char hexsep = '.';              /* for hexprint */
        static const char hexfmt[] = "%02x%c";  /* for hexprint */
@@ -427,19 +530,14 @@
                        struct in_multi inm;
                        union ifaddr_u *ifaddr = (union ifaddr_u *)rtinfo;
 
-                       multiaddr = (u_long)
-                           ifaddr->in.ia_multiaddrs.lh_first;
+                       multiaddr = (u_long)ifaddr->in.ia_multiaddrs.lh_first;
                        while (multiaddr != 0) {
-                               kread(multiaddr, (char *)&inm,
-                                  sizeof inm);
-                               printf("\n%25s %-17.17s ", "",
-                                  routename4(
-                                     inm.inm_addr.s_addr, nflag));
-                               multiaddr =
-                                  (u_long)inm.inm_list.le_next;
+                               kread(multiaddr, (char *)&inm, sizeof inm);
+                               ia4_print(&inm.inm_addr);
+                               multiaddr = (u_long)inm.inm_list.le_next;
                        }
                } else {
-                       // XXX: Sysctl/ioctl to get multicast addresses
+                       mc4_print(name);
                }
                break;
 #ifdef INET6
@@ -491,7 +589,7 @@
                                multiaddr = (u_long)inm.in6m_entry.le_next;
                        }
                } else {
-                       // XXX: Sysctl/ioctl to get multicast addresses
+                       mc6_print(name);
                }
                break;
 #endif /*INET6*/
diff -r ea26aabe8a65 -r d0ac7b721233 usr.bin/netstat/main.c
--- a/usr.bin/netstat/main.c    Thu Jul 14 18:18:16 2016 +0000
+++ b/usr.bin/netstat/main.c    Thu Jul 14 18:19:11 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main.c,v 1.96 2016/07/13 21:57:01 christos Exp $       */
+/*     $NetBSD: main.c,v 1.97 2016/07/14 18:19:11 christos Exp $       */
 
 /*
  * Copyright (c) 1983, 1988, 1993
@@ -39,7 +39,7 @@
 #if 0
 static char sccsid[] = "from: @(#)main.c       8.4 (Berkeley) 3/1/94";
 #else
-__RCSID("$NetBSD: main.c,v 1.96 2016/07/13 21:57:01 christos Exp $");
+__RCSID("$NetBSD: main.c,v 1.97 2016/07/14 18:19:11 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -358,7 +358,6 @@
                 */
                use_sysctl = 0;
        } else if (qflag ||
-                  (iflag && aflag) ||  /* For multicast */
 #ifndef SMALL
                   gflag ||
 #endif