text: /*
   * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the project nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD: src/usr.sbin/ifmcstat/ifmcstat.c,v 1.12 2004/09/13 08:14:55 dd Exp $
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <fcntl.h>
  #include <kvm.h>
  #include <nlist.h>
  #include <string.h>
  #include <limits.h>
  
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <sys/queue.h>
  
  #include <net/ethernet.h>
  #include <net/if.h>
  #include <net/if_var.h>
  #include <net/if_types.h>
  #include <net/if_dl.h>
  #include <netinet/in.h>
  #define	_KERNEL
  #include <netinet/if_ether.h>
  #undef	_KERNEL
  #include <netinet/in_var.h>
  #include <arpa/inet.h>
  
  #include <netdb.h>
  
  kvm_t	*kvmd;
  
  struct	nlist nl[] = {
  #define	N_IFNET	0
  	{ "_ifnet" },
  	{ "" },
  };
  
  const char *inet6_n2a __P((struct in6_addr *));
  int main __P((void));
  char *ifname __P((struct ifnet *));
  void kread __P((u_long, void *, int));
  void if6_addrlist __P((struct ifaddr *));
  void in6_multilist __P((struct in6_multi *));
  struct in6_multi * in6_multientry __P((struct in6_multi *));
  
  #define	KREAD(addr, buf, type) \
  	kread((u_long)addr, (void *)buf, sizeof(type))
  
  #ifdef N_IN6_MK
  struct multi6_kludge {
  	LIST_ENTRY(multi6_kludge) mk_entry;
  	struct ifnet *mk_ifp;
  	struct in6_multihead mk_head;
  };
  #endif
  
  const char *inet6_n2a(p)
  	struct in6_addr *p;
  {
  	static char buf[NI_MAXHOST];
  	struct sockaddr_in6 sin6;
  	u_int32_t scopeid;
  	const int niflags = NI_NUMERICHOST;
  
  	memset(&sin6, 0, sizeof(sin6));
  	sin6.sin6_family = AF_INET6;
  	sin6.sin6_len = sizeof(struct sockaddr_in6);
  	sin6.sin6_addr = *p;
  	if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p)) {
  		scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
  		if (scopeid) {
  			sin6.sin6_scope_id = scopeid;
  			sin6.sin6_addr.s6_addr[2] = 0;
  			sin6.sin6_addr.s6_addr[3] = 0;
  		}
  	}
  	if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
  			buf, sizeof(buf), NULL, 0, niflags) == 0)
  		return buf;
  	else
  		return "(invalid)";
  }
  
  int main()
  {
  	char	buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
  	struct	ifnet	*ifp, *nifp, ifnet;
  
  	if ((kvmd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, buf)) == NULL) {
  		perror("kvm_openfiles");
  		exit(1);
  	}
  	if (kvm_nlist(kvmd, nl) < 0) {
  		perror("kvm_nlist");
  		exit(1);
  	}
  	if (nl[N_IFNET].n_value == 0) {
  		printf("symbol %s not found\n", nl[N_IFNET].n_name);
  		exit(1);
  	}
  	KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
  	while (ifp) {
  		KREAD(ifp, &ifnet, struct ifnet);
  		printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
  
  		if6_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
  		nifp = TAILQ_NEXT(&ifnet, if_link);
  
  		/* not supported */
  
  		ifp = nifp;
  	}
  
  	exit(0);
  	/*NOTREACHED*/
  }
  
  char *ifname(ifp)
  	struct ifnet *ifp;
  {
  	static char buf[BUFSIZ];
  	struct ifnet ifnet;
  
  	KREAD(ifp, &ifnet, struct ifnet);
  	strlcpy(buf, ifnet.if_xname, sizeof(buf));
  	return buf;
  }
  
  void kread(addr, buf, len)
  	u_long addr;
  	void *buf;
  	int len;
  {
  	if (kvm_read(kvmd, addr, buf, len) != len) {
  		perror("kvm_read");
  		exit(1);
  	}
  }
  
  void
  if6_addrlist(ifap)
  	struct ifaddr *ifap;
  {
  	struct ifaddr ifa;
  	struct sockaddr sa;
  	struct in6_ifaddr if6a;
  	struct ifaddr *ifap0;
  
  	ifap0 = ifap;
  	while (ifap) {
  		KREAD(ifap, &ifa, struct ifaddr);
  		if (ifa.ifa_addr == NULL)
  			goto nextifap;
  		KREAD(ifa.ifa_addr, &sa, struct sockaddr);
  		if (sa.sa_family != PF_INET6)
  			goto nextifap;
  		KREAD(ifap, &if6a, struct in6_ifaddr);
  		printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr));
  	nextifap:
  		ifap = TAILQ_NEXT(&ifa, ifa_link);
  	}
  	if (ifap0) {
  		struct ifnet ifnet;
  		struct ifmultiaddr ifm, *ifmp = 0;
  		struct sockaddr_dl sdl;
  
  		KREAD(ifap0, &ifa, struct ifaddr);
  		KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
  		if (TAILQ_FIRST(&ifnet.if_multiaddrs))
  			ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
  		while (ifmp) {
  			KREAD(ifmp, &ifm, struct ifmultiaddr);
  			if (ifm.ifma_addr == NULL)
  				goto nextmulti;
  			KREAD(ifm.ifma_addr, &sa, struct sockaddr);
  			if (sa.sa_family != AF_INET6)
  				goto nextmulti;
  			(void)in6_multientry((struct in6_multi *)
  					     ifm.ifma_protospec);
  			if (ifm.ifma_lladdr == 0)
  				goto nextmulti;
  			KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
  			printf("\t\t\tmcast-macaddr %s multicnt %d\n",
  			       ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
  			       ifm.ifma_refcount);
  		    nextmulti:
  			ifmp = TAILQ_NEXT(&ifm, ifma_link);
  		}
  	}
  #ifdef N_IN6_MK
  	if (nl[N_IN6_MK].n_value != 0) {
  		LIST_HEAD(in6_mktype, multi6_kludge) in6_mk;
  		struct multi6_kludge *mkp, mk;
  		char *nam;
  
  		KREAD(nl[N_IN6_MK].n_value, &in6_mk, struct in6_mktype);
  		KREAD(ifap0, &ifa, struct ifaddr);
  
  		nam = strdup(ifname(ifa.ifa_ifp));
  		if (!nam) {
  			fprintf(stderr, "ifmcstat: not enough core\n");
  			exit(1);
  		}
  
  		LIST_FOREACH(mkp, &in6_mk, mk_entry) {
  			KREAD(mkp, &mk, struct multi6_kludge);
  			if (strcmp(nam, ifname(mk.mk_ifp)) == 0 &&
  			    LIST_FIRST(&mk.mk_head)) {
  				printf("\t(on kludge entry for %s)\n", nam);
  				in6_multilist(LIST_FIRST(&mk.mk_head));
  			}
  		}
  
  		free(nam);
  	}
  #endif
  }
  
  struct in6_multi *
  in6_multientry(mc)
  	struct in6_multi *mc;
  {
  	struct in6_multi multi;
  
  	KREAD(mc, &multi, struct in6_multi);
  	printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr));
  	printf(" refcnt %u\n", multi.in6m_refcount);
  	return(LIST_NEXT(&multi, in6m_entry));
  }
  
  void
  in6_multilist(mc)
  	struct in6_multi *mc;
  {
  	while (mc)
  		mc = in6_multientry(mc);
  }
  