usr.sbin/ifmcstat/ifmcstat.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/usr.sbin/ifmcstat/ifmcstat.c,v 1.3.2.2 2001/07/03 11:02:06 ume Exp $
  30  */
  31
  32 #define _KERNEL_STRUCTURES
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <fcntl.h>
  37 #include <kvm.h>
  38 #include <nlist.h>
  39 #include <string.h>
  40 #include <limits.h>
  41
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44 #include <sys/queue.h>
  45
  46 #include <net/if.h>
  47 #include <net/if_var.h>
  48 #include <net/if_types.h>
  49 #include <net/if_dl.h>
  50 #include <netinet/in.h>
  51 #include <netinet/if_ether.h>
  52 #include <netinet/in_var.h>
  53 #include <arpa/inet.h>
  54
  55 #include <netdb.h>
  56
  57 kvm_t   *kvmd;
  58
  59 struct  nlist nl[] = {
  60 #define N_IFNET 0
  61         { .n_name = "_ifnet" },
  62         { .n_name = "" },
  63 };
  64
  65 const char *inet6_n2a(struct in6_addr *);
  66 char *ifname(struct ifnet *);
  67 void kread(u_long, void *, int);
  68 void if6_addrlist(struct ifaddr_container *);
  69 void in6_multilist(struct in6_multi *);
  70 struct in6_multi * in6_multientry(struct in6_multi *);
  71
  72 #define KREAD(addr, buf, type) \
  73         kread((u_long)addr, (void *)buf, sizeof(type))
  74
  75 #ifdef N_IN6_MK
  76 struct multi6_kludge {
  77         LIST_ENTRY(multi6_kludge) mk_entry;
  78         struct ifnet *mk_ifp;
  79         struct in6_multihead mk_head;
  80 };
  81 #endif
  82
  83 const char *
  84 inet6_n2a(struct in6_addr *p)
  85 {
  86         static char buf[NI_MAXHOST];
  87         struct sockaddr_in6 sin6;
  88         u_int32_t scopeid;
  89 #ifdef NI_WITHSCOPEID
  90         const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
  91 #else
  92         const int niflags = NI_NUMERICHOST;
  93 #endif
  94
  95         memset(&sin6, 0, sizeof(sin6));
  96         sin6.sin6_family = AF_INET6;
  97         sin6.sin6_len = sizeof(struct sockaddr_in6);
  98         sin6.sin6_addr = *p;
  99         if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p)) {
 100                 scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 101                 if (scopeid) {
 102                         sin6.sin6_scope_id = scopeid;
 103                         sin6.sin6_addr.s6_addr[2] = 0;
 104                         sin6.sin6_addr.s6_addr[3] = 0;
 105                 }
 106         }
 107         if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 108                         buf, sizeof(buf), NULL, 0, niflags) == 0)
 109                 return buf;
 110         else
 111                 return "(invalid)";
 112 }
 113
 114 int
 115 main(int argc __unused, char **argv __unused)
 116 {
 117         char    buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
 118         struct  ifnet   *ifp, *nifp, ifnet;
 119
 120         if ((kvmd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, buf)) == NULL) {
 121                 perror("kvm_openfiles");
 122                 exit(1);
 123         }
 124         if (kvm_nlist(kvmd, nl) < 0) {
 125                 perror("kvm_nlist");
 126                 exit(1);
 127         }
 128         if (nl[N_IFNET].n_value == 0) {
 129                 printf("symbol %s not found\n", nl[N_IFNET].n_name);
 130                 exit(1);
 131         }
 132         KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
 133         while (ifp) {
 134                 struct ifaddrhead head;
 135                 struct ifaddr_container ifac, *ifacp = NULL;
 136
 137                 KREAD(ifp, &ifnet, struct ifnet);
 138                 printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
 139
 140                 KREAD(ifnet.if_addrheads, &head, struct ifaddrhead);
 141                 if (TAILQ_FIRST(&head) != NULL) {
 142                         KREAD(TAILQ_FIRST(&head), &ifac,
 143                               struct ifaddr_container);
 144                         ifacp = &ifac;
 145                 }
 146
 147                 if6_addrlist(ifacp);
 148                 nifp = ifnet.if_link.tqe_next;
 149
 150                 /* not supported */
 151
 152                 ifp = nifp;
 153         }
 154
 155         exit(0);
 156         /*NOTREACHED*/
 157 }
 158
 159 char *
 160 ifname(struct ifnet *ifp)
 161 {
 162         static char buf[BUFSIZ];
 163         struct ifnet ifnet;
 164
 165         KREAD(ifp, &ifnet, struct ifnet);
 166         strlcpy(buf, ifnet.if_xname, sizeof(buf));
 167         return buf;
 168 }
 169
 170 void
 171 kread(u_long addr, void *buf, int len)
 172 {
 173         if (kvm_read(kvmd, addr, buf, len) != len) {
 174                 perror("kvm_read");
 175                 exit(1);
 176         }
 177 }
 178
 179 void
 180 if6_addrlist(struct ifaddr_container *ifac)
 181 {
 182         struct ifaddr *ifap;
 183         struct ifaddr ifa;
 184         struct sockaddr sa;
 185         struct in6_ifaddr if6a;
 186         struct ifaddr *ifap0;
 187
 188         if (ifac != NULL)
 189                 ifap = ifac->ifa;
 190         else
 191                 ifap = NULL;
 192
 193         ifap0 = ifap;
 194         while (ifap) {
 195                 KREAD(ifap, &ifa, struct ifaddr);
 196                 if (ifa.ifa_addr == NULL)
 197                         goto nextifap;
 198                 KREAD(ifa.ifa_addr, &sa, struct sockaddr);
 199                 if (sa.sa_family != PF_INET6)
 200                         goto nextifap;
 201                 KREAD(ifap, &if6a, struct in6_ifaddr);
 202                 printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr));
 203         nextifap:
 204                 if (TAILQ_NEXT(ifac, ifa_link) == NULL) {
 205                         ifap = NULL;
 206                 } else {
 207                         KREAD(TAILQ_NEXT(ifac, ifa_link), ifac,
 208                               struct ifaddr_container);
 209                         ifap = ifac->ifa;
 210                 }
 211         }
 212         if (ifap0) {
 213                 struct ifnet ifnet;
 214                 struct ifmultiaddr ifm, *ifmp = 0;
 215                 struct sockaddr_dl sdl;
 216
 217                 KREAD(ifap0, &ifa, struct ifaddr);
 218                 KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
 219                 if (TAILQ_FIRST(&ifnet.if_multiaddrs))
 220                         ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
 221                 while (ifmp) {
 222                         KREAD(ifmp, &ifm, struct ifmultiaddr);
 223                         if (ifm.ifma_addr == NULL)
 224                                 goto nextmulti;
 225                         KREAD(ifm.ifma_addr, &sa, struct sockaddr);
 226                         if (sa.sa_family != AF_INET6)
 227                                 goto nextmulti;
 228                         in6_multientry((struct in6_multi *)ifm.ifma_protospec);
 229                         if (ifm.ifma_lladdr == 0)
 230                                 goto nextmulti;
 231                         KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
 232                         printf("\t\t\tmcast-macaddr %s multicnt %d\n",
 233                                ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
 234                                ifm.ifma_refcount);
 235                     nextmulti:
 236                         ifmp = TAILQ_NEXT(&ifm, ifma_link);
 237                 }
 238         }
 239 #ifdef N_IN6_MK
 240         if (nl[N_IN6_MK].n_value != 0) {
 241                 LIST_HEAD(in6_mktype, multi6_kludge) in6_mk;
 242                 struct multi6_kludge *mkp, mk;
 243                 char *nam;
 244
 245                 KREAD(nl[N_IN6_MK].n_value, &in6_mk, struct in6_mktype);
 246                 KREAD(ifap0, &ifa, struct ifaddr);
 247
 248                 nam = strdup(ifname(ifa.ifa_ifp));
 249                 if (!nam) {
 250                         fprintf(stderr, "ifmcstat: not enough core\n");
 251                         exit(1);
 252                 }
 253
 254                 for (mkp = in6_mk.lh_first; mkp; mkp = mk.mk_entry.le_next) {
 255                         KREAD(mkp, &mk, struct multi6_kludge);
 256                         if (strcmp(nam, ifname(mk.mk_ifp)) == 0 &&
 257                             mk.mk_head.lh_first) {
 258                                 printf("\t(on kludge entry for %s)\n", nam);
 259                                 in6_multilist(mk.mk_head.lh_first);
 260                         }
 261                 }
 262
 263                 free(nam);
 264         }
 265 #endif
 266 }
 267
 268 struct in6_multi *
 269 in6_multientry(struct in6_multi *mc)
 270 {
 271         struct in6_multi multi;
 272
 273         KREAD(mc, &multi, struct in6_multi);
 274         printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr));
 275         printf(" refcnt %u\n", multi.in6m_refcount);
 276         return(multi.in6m_entry.le_next);
 277 }
 278
 279 void
 280 in6_multilist(struct in6_multi *mc)
 281 {
 282         while (mc)
 283                 mc = in6_multientry(mc);
 284 }