sbin/ifconfig/ifconfig.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  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  * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1983, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)ifconfig.c  8.2 (Berkeley) 2/16/94";
  39 #endif
  40 static const char rcsid[] =
  41   "$FreeBSD$";
  42 #endif /* not lint */
  43
  44 #include <sys/param.h>
  45 #include <sys/ioctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/sysctl.h>
  48 #include <sys/time.h>
  49 #include <sys/module.h>
  50 #include <sys/linker.h>
  51
  52 #include <net/ethernet.h>
  53 #include <net/if.h>
  54 #include <net/if_var.h>
  55 #include <net/if_dl.h>
  56 #include <net/if_types.h>
  57 #include <net/route.h>
  58
  59 /* IP */
  60 #include <netinet/in.h>
  61 #include <netinet/in_var.h>
  62 #include <arpa/inet.h>
  63 #include <netdb.h>
  64
  65 #include <ifaddrs.h>
  66 #include <ctype.h>
  67 #include <err.h>
  68 #include <errno.h>
  69 #include <fcntl.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <unistd.h>
  74
  75 #include "ifconfig.h"
  76
  77 /*
  78  * Since "struct ifreq" is composed of various union members, callers
  79  * should pay special attention to interprete the value.
  80  * (.e.g. little/big endian difference in the structure.)
  81  */
  82 struct  ifreq ifr;
  83
  84 char    name[IFNAMSIZ];
  85 int     setaddr;
  86 int     setmask;
  87 int     doalias;
  88 int     clearaddr;
  89 int     newaddr = 1;
  90 int     verbose;
  91 int     noload;
  92
  93 int     supmedia = 0;
  94 int     printkeys = 0;          /* Print keying material for interfaces. */
  95
  96 static  int ifconfig(int argc, char *const *argv, int iscreate,
  97                 const struct afswtch *afp);
  98 static  void status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
  99                 struct ifaddrs *ifa);
 100 static  void tunnel_status(int s);
 101 static  void usage(void);
 102
 103 static struct afswtch *af_getbyname(const char *name);
 104 static struct afswtch *af_getbyfamily(int af);
 105 static void af_other_status(int);
 106
 107 static struct option *opts = NULL;
 108
 109 void
 110 opt_register(struct option *p)
 111 {
 112         p->next = opts;
 113         opts = p;
 114 }
 115
 116 static void
 117 usage(void)
 118 {
 119         char options[1024];
 120         struct option *p;
 121
 122         /* XXX not right but close enough for now */
 123         options[0] = '\0';
 124         for (p = opts; p != NULL; p = p->next) {
 125                 strlcat(options, p->opt_usage, sizeof(options));
 126                 strlcat(options, " ", sizeof(options));
 127         }
 128
 129         fprintf(stderr,
 130         "usage: ifconfig %sinterface address_family [address [dest_address]]\n"
 131         "                [parameters]\n"
 132         "       ifconfig interface create\n"
 133         "       ifconfig -a %s[-d] [-m] [-u] [-v] [address_family]\n"
 134         "       ifconfig -l [-d] [-u] [address_family]\n"
 135         "       ifconfig %s[-d] [-m] [-u] [-v]\n",
 136                 options, options, options);
 137         exit(1);
 138 }
 139
 140 int
 141 main(int argc, char *argv[])
 142 {
 143         int c, all, namesonly, downonly, uponly;
 144         const struct afswtch *afp = NULL;
 145         int ifindex;
 146         struct ifaddrs *ifap, *ifa;
 147         struct ifreq paifr;
 148         const struct sockaddr_dl *sdl;
 149         char options[1024], *cp;
 150         const char *ifname;
 151         struct option *p;
 152         size_t iflen;
 153
 154         all = downonly = uponly = namesonly = noload = verbose = 0;
 155
 156         /* Parse leading line options */
 157         strlcpy(options, "adklmnuv", sizeof(options));
 158         for (p = opts; p != NULL; p = p->next)
 159                 strlcat(options, p->opt, sizeof(options));
 160         while ((c = getopt(argc, argv, options)) != -1) {
 161                 switch (c) {
 162                 case 'a':       /* scan all interfaces */
 163                         all++;
 164                         break;
 165                 case 'd':       /* restrict scan to "down" interfaces */
 166                         downonly++;
 167                         break;
 168                 case 'k':
 169                         printkeys++;
 170                         break;
 171                 case 'l':       /* scan interface names only */
 172                         namesonly++;
 173                         break;
 174                 case 'm':       /* show media choices in status */
 175                         supmedia = 1;
 176                         break;
 177                 case 'n':       /* suppress module loading */
 178                         noload++;
 179                         break;
 180                 case 'u':       /* restrict scan to "up" interfaces */
 181                         uponly++;
 182                         break;
 183                 case 'v':
 184                         verbose++;
 185                         break;
 186                 default:
 187                         for (p = opts; p != NULL; p = p->next)
 188                                 if (p->opt[0] == c) {
 189                                         p->cb(optarg);
 190                                         break;
 191                                 }
 192                         if (p == NULL)
 193                                 usage();
 194                         break;
 195                 }
 196         }
 197         argc -= optind;
 198         argv += optind;
 199
 200         /* -l cannot be used with -a or -m */
 201         if (namesonly && (all || supmedia))
 202                 usage();
 203
 204         /* nonsense.. */
 205         if (uponly && downonly)
 206                 usage();
 207
 208         /* no arguments is equivalent to '-a' */
 209         if (!namesonly && argc < 1)
 210                 all = 1;
 211
 212         /* -a and -l allow an address family arg to limit the output */
 213         if (all || namesonly) {
 214                 if (argc > 1)
 215                         usage();
 216
 217                 ifname = NULL;
 218                 ifindex = 0;
 219                 if (argc == 1) {
 220                         afp = af_getbyname(*argv);
 221                         if (afp == NULL)
 222                                 usage();
 223                         if (afp->af_name != NULL)
 224                                 argc--, argv++;
 225                         /* leave with afp non-zero */
 226                 }
 227         } else {
 228                 /* not listing, need an argument */
 229                 if (argc < 1)
 230                         usage();
 231
 232                 ifname = *argv;
 233                 argc--, argv++;
 234
 235                 /* check and maybe load support for this interface */
 236                 ifmaybeload(ifname);
 237
 238                 ifindex = if_nametoindex(ifname);
 239                 if (ifindex == 0) {
 240                         /*
 241                          * NOTE:  We must special-case the `create' command
 242                          * right here as we would otherwise fail when trying
 243                          * to find the interface.
 244                          */
 245                         if (argc > 0 && (strcmp(argv[0], "create") == 0 ||
 246                             strcmp(argv[0], "plumb") == 0)) {
 247                                 iflen = strlcpy(name, ifname, sizeof(name));
 248                                 if (iflen >= sizeof(name))
 249                                         errx(1, "%s: cloning name too long",
 250                                             ifname);
 251                                 ifconfig(argc, argv, 1, NULL);
 252                                 exit(0);
 253                         }
 254                         errx(1, "interface %s does not exist", ifname);
 255                 }
 256         }
 257
 258         /* Check for address family */
 259         if (argc > 0) {
 260                 afp = af_getbyname(*argv);
 261                 if (afp != NULL)
 262                         argc--, argv++;
 263         }
 264
 265         if (getifaddrs(&ifap) != 0)
 266                 err(EXIT_FAILURE, "getifaddrs");
 267         cp = NULL;
 268         ifindex = 0;
 269         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 270                 memset(&paifr, 0, sizeof(paifr));
 271                 strncpy(paifr.ifr_name, ifa->ifa_name, sizeof(paifr.ifr_name));
 272                 if (sizeof(paifr.ifr_addr) >= ifa->ifa_addr->sa_len) {
 273                         memcpy(&paifr.ifr_addr, ifa->ifa_addr,
 274                             ifa->ifa_addr->sa_len);
 275                 }
 276
 277                 if (ifname != NULL && strcmp(ifname, ifa->ifa_name) != 0)
 278                         continue;
 279                 if (ifa->ifa_addr->sa_family == AF_LINK)
 280                         sdl = (const struct sockaddr_dl *) ifa->ifa_addr;
 281                 else
 282                         sdl = NULL;
 283                 if (cp != NULL && strcmp(cp, ifa->ifa_name) == 0)
 284                         continue;
 285                 iflen = strlcpy(name, ifa->ifa_name, sizeof(name));
 286                 if (iflen >= sizeof(name)) {
 287                         warnx("%s: interface name too long, skipping",
 288                             ifa->ifa_name);
 289                         continue;
 290                 }
 291                 cp = ifa->ifa_name;
 292
 293                 if (downonly && (ifa->ifa_flags & IFF_UP) != 0)
 294                         continue;
 295                 if (uponly && (ifa->ifa_flags & IFF_UP) == 0)
 296                         continue;
 297                 ifindex++;
 298                 /*
 299                  * Are we just listing the interfaces?
 300                  */
 301                 if (namesonly) {
 302                         if (ifindex > 1)
 303                                 printf(" ");
 304                         fputs(name, stdout);
 305                         continue;
 306                 }
 307
 308                 if (argc > 0)
 309                         ifconfig(argc, argv, 0, afp);
 310                 else
 311                         status(afp, sdl, ifa);
 312         }
 313         if (namesonly)
 314                 printf("\n");
 315         freeifaddrs(ifap);
 316
 317         exit(0);
 318 }
 319
 320 static struct afswtch *afs = NULL;
 321
 322 void
 323 af_register(struct afswtch *p)
 324 {
 325         p->af_next = afs;
 326         afs = p;
 327 }
 328
 329 static struct afswtch *
 330 af_getbyname(const char *name)
 331 {
 332         struct afswtch *afp;
 333
 334         for (afp = afs; afp !=  NULL; afp = afp->af_next)
 335                 if (strcmp(afp->af_name, name) == 0)
 336                         return afp;
 337         return NULL;
 338 }
 339
 340 static struct afswtch *
 341 af_getbyfamily(int af)
 342 {
 343         struct afswtch *afp;
 344
 345         for (afp = afs; afp != NULL; afp = afp->af_next)
 346                 if (afp->af_af == af)
 347                         return afp;
 348         return NULL;
 349 }
 350
 351 static void
 352 af_other_status(int s)
 353 {
 354         struct afswtch *afp;
 355         uint8_t afmask[howmany(AF_MAX, NBBY)];
 356
 357         memset(afmask, 0, sizeof(afmask));
 358         for (afp = afs; afp != NULL; afp = afp->af_next) {
 359                 if (afp->af_other_status == NULL)
 360                         continue;
 361                 if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
 362                         continue;
 363                 afp->af_other_status(s);
 364                 setbit(afmask, afp->af_af);
 365         }
 366 }
 367
 368 static void
 369 af_all_tunnel_status(int s)
 370 {
 371         struct afswtch *afp;
 372         uint8_t afmask[howmany(AF_MAX, NBBY)];
 373
 374         memset(afmask, 0, sizeof(afmask));
 375         for (afp = afs; afp != NULL; afp = afp->af_next) {
 376                 if (afp->af_status_tunnel == NULL)
 377                         continue;
 378                 if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
 379                         continue;
 380                 afp->af_status_tunnel(s);
 381                 setbit(afmask, afp->af_af);
 382         }
 383 }
 384
 385 static struct cmd *cmds = NULL;
 386
 387 void
 388 cmd_register(struct cmd *p)
 389 {
 390         p->c_next = cmds;
 391         cmds = p;
 392 }
 393
 394 static const struct cmd *
 395 cmd_lookup(const char *name)
 396 {
 397 #define N(a)    (sizeof(a)/sizeof(a[0]))
 398         const struct cmd *p;
 399
 400         for (p = cmds; p != NULL; p = p->c_next)
 401                 if (strcmp(name, p->c_name) == 0)
 402                         return p;
 403         return NULL;
 404 #undef N
 405 }
 406
 407 struct callback {
 408         callback_func *cb_func;
 409         void    *cb_arg;
 410         struct callback *cb_next;
 411 };
 412 static struct callback *callbacks = NULL;
 413
 414 void
 415 callback_register(callback_func *func, void *arg)
 416 {
 417         struct callback *cb;
 418
 419         cb = malloc(sizeof(struct callback));
 420         if (cb == NULL)
 421                 errx(1, "unable to allocate memory for callback");
 422         cb->cb_func = func;
 423         cb->cb_arg = arg;
 424         cb->cb_next = callbacks;
 425         callbacks = cb;
 426 }
 427
 428 /* specially-handled commands */
 429 static void setifaddr(const char *, int, int, const struct afswtch *);
 430 static const struct cmd setifaddr_cmd = DEF_CMD("ifaddr", 0, setifaddr);
 431
 432 static void setifdstaddr(const char *, int, int, const struct afswtch *);
 433 static const struct cmd setifdstaddr_cmd =
 434         DEF_CMD("ifdstaddr", 0, setifdstaddr);
 435
 436 static int
 437 ifconfig(int argc, char *const *argv, int iscreate, const struct afswtch *afp)
 438 {
 439         const struct afswtch *nafp;
 440         struct callback *cb;
 441         int s;
 442
 443         strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
 444 top:
 445         if (afp == NULL)
 446                 afp = af_getbyname("inet");
 447         ifr.ifr_addr.sa_family =
 448                 afp->af_af == AF_LINK || afp->af_af == AF_UNSPEC ?
 449                 AF_INET : afp->af_af;
 450
 451         if ((s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0)) < 0)
 452                 err(1, "socket(family %u,SOCK_DGRAM", ifr.ifr_addr.sa_family);
 453
 454         while (argc > 0) {
 455                 const struct cmd *p;
 456
 457                 p = cmd_lookup(*argv);
 458                 if (p == NULL) {
 459                         /*
 460                          * Not a recognized command, choose between setting
 461                          * the interface address and the dst address.
 462                          */
 463                         p = (setaddr ? &setifdstaddr_cmd : &setifaddr_cmd);
 464                 }
 465                 if (p->c_u.c_func || p->c_u.c_func2) {
 466                         if (iscreate && !p->c_iscloneop) {
 467                                 /*
 468                                  * Push the clone create callback so the new
 469                                  * device is created and can be used for any
 470                                  * remaining arguments.
 471                                  */
 472                                 cb = callbacks;
 473                                 if (cb == NULL)
 474                                         errx(1, "internal error, no callback");
 475                                 callbacks = cb->cb_next;
 476                                 cb->cb_func(s, cb->cb_arg);
 477                                 iscreate = 0;
 478                                 /*
 479                                  * Handle any address family spec that
 480                                  * immediately follows and potentially
 481                                  * recreate the socket.
 482                                  */
 483                                 nafp = af_getbyname(*argv);
 484                                 if (nafp != NULL) {
 485                                         argc--, argv++;
 486                                         if (nafp != afp) {
 487                                                 close(s);
 488                                                 afp = nafp;
 489                                                 goto top;
 490                                         }
 491                                 }
 492                         }
 493                         if (p->c_parameter == NEXTARG) {
 494                                 if (argv[1] == NULL)
 495                                         errx(1, "'%s' requires argument",
 496                                             p->c_name);
 497                                 p->c_u.c_func(argv[1], 0, s, afp);
 498                                 argc--, argv++;
 499                         } else if (p->c_parameter == OPTARG) {
 500                                 p->c_u.c_func(argv[1], 0, s, afp);
 501                                 if (argv[1] != NULL)
 502                                         argc--, argv++;
 503                         } else if (p->c_parameter == NEXTARG2) {
 504                                 if (argc < 3)
 505                                         errx(1, "'%s' requires 2 arguments",
 506                                             p->c_name);
 507                                 p->c_u.c_func2(argv[1], argv[2], s, afp);
 508                                 argc -= 2, argv += 2;
 509                         } else
 510                                 p->c_u.c_func(*argv, p->c_parameter, s, afp);
 511                 }
 512                 argc--, argv++;
 513         }
 514
 515         /*
 516          * Do any post argument processing required by the address family.
 517          */
 518         if (afp->af_postproc != NULL)
 519                 afp->af_postproc(s, afp);
 520         /*
 521          * Do deferred callbacks registered while processing
 522          * command-line arguments.
 523          */
 524         for (cb = callbacks; cb != NULL; cb = cb->cb_next)
 525                 cb->cb_func(s, cb->cb_arg);
 526         /*
 527          * Do deferred operations.
 528          */
 529         if (clearaddr) {
 530                 if (afp->af_ridreq == NULL || afp->af_difaddr == 0) {
 531                         warnx("interface %s cannot change %s addresses!",
 532                               name, afp->af_name);
 533                         clearaddr = 0;
 534                 }
 535         }
 536         if (clearaddr) {
 537                 int ret;
 538                 strncpy(afp->af_ridreq, name, sizeof ifr.ifr_name);
 539                 ret = ioctl(s, afp->af_difaddr, afp->af_ridreq);
 540                 if (ret < 0) {
 541                         if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
 542                                 /* means no previous address for interface */
 543                         } else
 544                                 Perror("ioctl (SIOCDIFADDR)");
 545                 }
 546         }
 547         if (newaddr) {
 548                 if (afp->af_addreq == NULL || afp->af_aifaddr == 0) {
 549                         warnx("interface %s cannot change %s addresses!",
 550                               name, afp->af_name);
 551                         newaddr = 0;
 552                 }
 553         }
 554         if (newaddr && (setaddr || setmask)) {
 555                 strncpy(afp->af_addreq, name, sizeof ifr.ifr_name);
 556                 if (ioctl(s, afp->af_aifaddr, afp->af_addreq) < 0)
 557                         Perror("ioctl (SIOCAIFADDR)");
 558         }
 559
 560         close(s);
 561         return(0);
 562 }
 563
 564 /*ARGSUSED*/
 565 static void
 566 setifaddr(const char *addr, int param, int s, const struct afswtch *afp)
 567 {
 568         if (afp->af_getaddr == NULL)
 569                 return;
 570         /*
 571          * Delay the ioctl to set the interface addr until flags are all set.
 572          * The address interpretation may depend on the flags,
 573          * and the flags may change when the address is set.
 574          */
 575         setaddr++;
 576         if (doalias == 0 && afp->af_af != AF_LINK)
 577                 clearaddr = 1;
 578         afp->af_getaddr(addr, (doalias >= 0 ? ADDR : RIDADDR));
 579 }
 580
 581 static void
 582 settunnel(const char *src, const char *dst, int s, const struct afswtch *afp)
 583 {
 584         struct addrinfo *srcres, *dstres;
 585         int ecode;
 586
 587         if (afp->af_settunnel == NULL) {
 588                 warn("address family %s does not support tunnel setup",
 589                         afp->af_name);
 590                 return;
 591         }
 592
 593         if ((ecode = getaddrinfo(src, NULL, NULL, &srcres)) != 0)
 594                 errx(1, "error in parsing address string: %s",
 595                     gai_strerror(ecode));
 596
 597         if ((ecode = getaddrinfo(dst, NULL, NULL, &dstres)) != 0)
 598                 errx(1, "error in parsing address string: %s",
 599                     gai_strerror(ecode));
 600
 601         if (srcres->ai_addr->sa_family != dstres->ai_addr->sa_family)
 602                 errx(1,
 603                     "source and destination address families do not match");
 604
 605         afp->af_settunnel(s, srcres, dstres);
 606
 607         freeaddrinfo(srcres);
 608         freeaddrinfo(dstres);
 609 }
 610
 611 /* ARGSUSED */
 612 static void
 613 deletetunnel(const char *vname, int param, int s, const struct afswtch *afp)
 614 {
 615
 616         if (ioctl(s, SIOCDIFPHYADDR, &ifr) < 0)
 617                 err(1, "SIOCDIFPHYADDR");
 618 }
 619
 620 static void
 621 setifnetmask(const char *addr, int dummy __unused, int s,
 622     const struct afswtch *afp)
 623 {
 624         if (afp->af_getaddr != NULL) {
 625                 setmask++;
 626                 afp->af_getaddr(addr, MASK);
 627         }
 628 }
 629
 630 static void
 631 setifbroadaddr(const char *addr, int dummy __unused, int s,
 632     const struct afswtch *afp)
 633 {
 634         if (afp->af_getaddr != NULL)
 635                 afp->af_getaddr(addr, DSTADDR);
 636 }
 637
 638 static void
 639 setifipdst(const char *addr, int dummy __unused, int s,
 640     const struct afswtch *afp)
 641 {
 642         const struct afswtch *inet;
 643
 644         inet = af_getbyname("inet");
 645         if (inet == NULL)
 646                 return;
 647         inet->af_getaddr(addr, DSTADDR);
 648         clearaddr = 0;
 649         newaddr = 0;
 650 }
 651
 652 static void
 653 notealias(const char *addr, int param, int s, const struct afswtch *afp)
 654 {
 655 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
 656         if (setaddr && doalias == 0 && param < 0)
 657                 if (afp->af_addreq != NULL && afp->af_ridreq != NULL)
 658                         bcopy((caddr_t)rqtosa(af_addreq),
 659                               (caddr_t)rqtosa(af_ridreq),
 660                               rqtosa(af_addreq)->sa_len);
 661         doalias = param;
 662         if (param < 0) {
 663                 clearaddr = 1;
 664                 newaddr = 0;
 665         } else
 666                 clearaddr = 0;
 667 #undef rqtosa
 668 }
 669
 670 /*ARGSUSED*/
 671 static void
 672 setifdstaddr(const char *addr, int param __unused, int s,
 673     const struct afswtch *afp)
 674 {
 675         if (afp->af_getaddr != NULL)
 676                 afp->af_getaddr(addr, DSTADDR);
 677 }
 678
 679 /*
 680  * Note: doing an SIOCIGIFFLAGS scribbles on the union portion
 681  * of the ifreq structure, which may confuse other parts of ifconfig.
 682  * Make a private copy so we can avoid that.
 683  */
 684 static void
 685 setifflags(const char *vname, int value, int s, const struct afswtch *afp)
 686 {
 687         struct ifreq            my_ifr;
 688         int flags;
 689
 690         bcopy((char *)&ifr, (char *)&my_ifr, sizeof(struct ifreq));
 691
 692         if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&my_ifr) < 0) {
 693                 Perror("ioctl (SIOCGIFFLAGS)");
 694                 exit(1);
 695         }
 696         strncpy(my_ifr.ifr_name, name, sizeof (my_ifr.ifr_name));
 697         flags = (my_ifr.ifr_flags & 0xffff) | (my_ifr.ifr_flagshigh << 16);
 698
 699         if (value < 0) {
 700                 value = -value;
 701                 flags &= ~value;
 702         } else
 703                 flags |= value;
 704         my_ifr.ifr_flags = flags & 0xffff;
 705         my_ifr.ifr_flagshigh = flags >> 16;
 706         if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&my_ifr) < 0)
 707                 Perror(vname);
 708 }
 709
 710 void
 711 setifcap(const char *vname, int value, int s, const struct afswtch *afp)
 712 {
 713         int flags;
 714
 715         if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) < 0) {
 716                 Perror("ioctl (SIOCGIFCAP)");
 717                 exit(1);
 718         }
 719         flags = ifr.ifr_curcap;
 720         if (value < 0) {
 721                 value = -value;
 722                 flags &= ~value;
 723         } else
 724                 flags |= value;
 725         flags &= ifr.ifr_reqcap;
 726         ifr.ifr_reqcap = flags;
 727         if (ioctl(s, SIOCSIFCAP, (caddr_t)&ifr) < 0)
 728                 Perror(vname);
 729 }
 730
 731 static void
 732 setifmetric(const char *val, int dummy __unused, int s,
 733     const struct afswtch *afp)
 734 {
 735         strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
 736         ifr.ifr_metric = atoi(val);
 737         if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
 738                 warn("ioctl (set metric)");
 739 }
 740
 741 static void
 742 setifmtu(const char *val, int dummy __unused, int s,
 743     const struct afswtch *afp)
 744 {
 745         strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
 746         ifr.ifr_mtu = atoi(val);
 747         if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0)
 748                 warn("ioctl (set mtu)");
 749 }
 750
 751 static void
 752 setifname(const char *val, int dummy __unused, int s,
 753     const struct afswtch *afp)
 754 {
 755         char *newname;
 756
 757         newname = strdup(val);
 758         if (newname == NULL) {
 759                 warn("no memory to set ifname");
 760                 return;
 761         }
 762         ifr.ifr_data = newname;
 763         if (ioctl(s, SIOCSIFNAME, (caddr_t)&ifr) < 0) {
 764                 warn("ioctl (set name)");
 765                 free(newname);
 766                 return;
 767         }
 768         strlcpy(name, newname, sizeof(name));
 769         free(newname);
 770 }
 771
 772 #define IFFBITS \
 773 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \
 774 "\10NOARP\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2" \
 775 "\20MULTICAST\22PPROMISC\23MONITOR\24STATICARP\25NEEDSGIANT"
 776
 777 #define IFCAPBITS \
 778 "\020\1RXCSUM\2TXCSUM\3NETCONS\4VLAN_MTU\5VLAN_HWTAGGING\6JUMBO_MTU\7POLLING" \
 779 "\10VLAN_HWCSUM\11TSO4\12TSO6\13LRO\14WOL_UCAST\15WOL_MCAST\16WOL_MAGIC" \
 780 "\21VLAN_HWFILTER"
 781
 782 /*
 783  * Print the status of the interface.  If an address family was
 784  * specified, show only it; otherwise, show them all.
 785  */
 786 static void
 787 status(const struct afswtch *afp, const struct sockaddr_dl *sdl,
 788         struct ifaddrs *ifa)
 789 {
 790         struct ifaddrs *ift;
 791         int allfamilies, s;
 792         struct ifstat ifs;
 793
 794         if (afp == NULL) {
 795                 allfamilies = 1;
 796                 afp = af_getbyname("inet");
 797         } else
 798                 allfamilies = 0;
 799
 800         ifr.ifr_addr.sa_family = afp->af_af == AF_LINK ? AF_INET : afp->af_af;
 801         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 802
 803         s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0);
 804         if (s < 0)
 805                 err(1, "socket(family %u,SOCK_DGRAM)", ifr.ifr_addr.sa_family);
 806
 807         printf("%s: ", name);
 808         printb("flags", ifa->ifa_flags, IFFBITS);
 809         if (ioctl(s, SIOCGIFMETRIC, &ifr) != -1)
 810                 printf(" metric %d", ifr.ifr_metric);
 811         if (ioctl(s, SIOCGIFMTU, &ifr) != -1)
 812                 printf(" mtu %d", ifr.ifr_mtu);
 813         putchar('\n');
 814
 815         if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) == 0) {
 816                 if (ifr.ifr_curcap != 0) {
 817                         printb("\toptions", ifr.ifr_curcap, IFCAPBITS);
 818                         putchar('\n');
 819                 }
 820                 if (supmedia && ifr.ifr_reqcap != 0) {
 821                         printb("\tcapabilities", ifr.ifr_reqcap, IFCAPBITS);
 822                         putchar('\n');
 823                 }
 824         }
 825
 826         tunnel_status(s);
 827
 828         for (ift = ifa; ift != NULL; ift = ift->ifa_next) {
 829                 if (ift->ifa_addr == NULL)
 830                         continue;
 831                 if (strcmp(ifa->ifa_name, ift->ifa_name) != 0)
 832                         continue;
 833                 if (allfamilies) {
 834                         const struct afswtch *p;
 835                         p = af_getbyfamily(ift->ifa_addr->sa_family);
 836                         if (p != NULL && p->af_status != NULL)
 837                                 p->af_status(s, ift);
 838                 } else if (afp->af_af == ift->ifa_addr->sa_family)
 839                         afp->af_status(s, ift);
 840         }
 841 #if 0
 842         if (allfamilies || afp->af_af == AF_LINK) {
 843                 const struct afswtch *lafp;
 844
 845                 /*
 846                  * Hack; the link level address is received separately
 847                  * from the routing information so any address is not
 848                  * handled above.  Cobble together an entry and invoke
 849                  * the status method specially.
 850                  */
 851                 lafp = af_getbyname("lladdr");
 852                 if (lafp != NULL) {
 853                         info.rti_info[RTAX_IFA] = (struct sockaddr *)sdl;
 854                         lafp->af_status(s, &info);
 855                 }
 856         }
 857 #endif
 858         if (allfamilies)
 859                 af_other_status(s);
 860         else if (afp->af_other_status != NULL)
 861                 afp->af_other_status(s);
 862
 863         strncpy(ifs.ifs_name, name, sizeof ifs.ifs_name);
 864         if (ioctl(s, SIOCGIFSTATUS, &ifs) == 0)
 865                 printf("%s", ifs.ascii);
 866
 867         close(s);
 868         return;
 869 }
 870
 871 static void
 872 tunnel_status(int s)
 873 {
 874         af_all_tunnel_status(s);
 875 }
 876
 877 void
 878 Perror(const char *cmd)
 879 {
 880         switch (errno) {
 881
 882         case ENXIO:
 883                 errx(1, "%s: no such interface", cmd);
 884                 break;
 885
 886         case EPERM:
 887                 errx(1, "%s: permission denied", cmd);
 888                 break;
 889
 890         default:
 891                 err(1, "%s", cmd);
 892         }
 893 }
 894
 895 /*
 896  * Print a value a la the %b format of the kernel's printf
 897  */
 898 void
 899 printb(const char *s, unsigned v, const char *bits)
 900 {
 901         int i, any = 0;
 902         char c;
 903
 904         if (bits && *bits == 8)
 905                 printf("%s=%o", s, v);
 906         else
 907                 printf("%s=%x", s, v);
 908         bits++;
 909         if (bits) {
 910                 putchar('<');
 911                 while ((i = *bits++) != '\0') {
 912                         if (v & (1 << (i-1))) {
 913                                 if (any)
 914                                         putchar(',');
 915                                 any = 1;
 916                                 for (; (c = *bits) > 32; bits++)
 917                                         putchar(c);
 918                         } else
 919                                 for (; *bits > 32; bits++)
 920                                         ;
 921                 }
 922                 putchar('>');
 923         }
 924 }
 925
 926 void
 927 ifmaybeload(const char *name)
 928 {
 929 #define MOD_PREFIX_LEN          3       /* "if_" */
 930         struct module_stat mstat;
 931         int fileid, modid;
 932         char ifkind[IFNAMSIZ + MOD_PREFIX_LEN], ifname[IFNAMSIZ], *dp;
 933         const char *cp;
 934
 935         /* loading suppressed by the user */
 936         if (noload)
 937                 return;
 938
 939         /* trim the interface number off the end */
 940         strlcpy(ifname, name, sizeof(ifname));
 941         for (dp = ifname; *dp != 0; dp++)
 942                 if (isdigit(*dp)) {
 943                         *dp = 0;
 944                         break;
 945                 }
 946
 947         /* turn interface and unit into module name */
 948         strcpy(ifkind, "if_");
 949         strlcpy(ifkind + MOD_PREFIX_LEN, ifname,
 950             sizeof(ifkind) - MOD_PREFIX_LEN);
 951
 952         /* scan files in kernel */
 953         mstat.version = sizeof(struct module_stat);
 954         for (fileid = kldnext(0); fileid > 0; fileid = kldnext(fileid)) {
 955                 /* scan modules in file */
 956                 for (modid = kldfirstmod(fileid); modid > 0;
 957                      modid = modfnext(modid)) {
 958                         if (modstat(modid, &mstat) < 0)
 959                                 continue;
 960                         /* strip bus name if present */
 961                         if ((cp = strchr(mstat.name, '/')) != NULL) {
 962                                 cp++;
 963                         } else {
 964                                 cp = mstat.name;
 965                         }
 966                         /* already loaded? */
 967                         if (strncmp(ifname, cp, strlen(ifname) + 1) == 0 ||
 968                             strncmp(ifkind, cp, strlen(ifkind) + 1) == 0)
 969                                 return;
 970                 }
 971         }
 972
 973         /* not present, we should try to load it */
 974         kldload(ifkind);
 975 }
 976
 977 static struct cmd basic_cmds[] = {
 978         DEF_CMD("up",           IFF_UP,         setifflags),
 979         DEF_CMD("down",         -IFF_UP,        setifflags),
 980         DEF_CMD("arp",          -IFF_NOARP,     setifflags),
 981         DEF_CMD("-arp",         IFF_NOARP,      setifflags),
 982         DEF_CMD("debug",        IFF_DEBUG,      setifflags),
 983         DEF_CMD("-debug",       -IFF_DEBUG,     setifflags),
 984         DEF_CMD("promisc",      IFF_PPROMISC,   setifflags),
 985         DEF_CMD("-promisc",     -IFF_PPROMISC,  setifflags),
 986         DEF_CMD("add",          IFF_UP,         notealias),
 987         DEF_CMD("alias",        IFF_UP,         notealias),
 988         DEF_CMD("-alias",       -IFF_UP,        notealias),
 989         DEF_CMD("delete",       -IFF_UP,        notealias),
 990         DEF_CMD("remove",       -IFF_UP,        notealias),
 991 #ifdef notdef
 992 #define EN_SWABIPS      0x1000
 993         DEF_CMD("swabips",      EN_SWABIPS,     setifflags),
 994         DEF_CMD("-swabips",     -EN_SWABIPS,    setifflags),
 995 #endif
 996         DEF_CMD_ARG("netmask",                  setifnetmask),
 997         DEF_CMD_ARG("metric",                   setifmetric),
 998         DEF_CMD_ARG("broadcast",                setifbroadaddr),
 999         DEF_CMD_ARG("ipdst",                    setifipdst),
1000         DEF_CMD_ARG2("tunnel",                  settunnel),
1001         DEF_CMD("-tunnel", 0,                   deletetunnel),
1002         DEF_CMD("deletetunnel", 0,              deletetunnel),
1003         DEF_CMD("link0",        IFF_LINK0,      setifflags),
1004         DEF_CMD("-link0",       -IFF_LINK0,     setifflags),
1005         DEF_CMD("link1",        IFF_LINK1,      setifflags),
1006         DEF_CMD("-link1",       -IFF_LINK1,     setifflags),
1007         DEF_CMD("link2",        IFF_LINK2,      setifflags),
1008         DEF_CMD("-link2",       -IFF_LINK2,     setifflags),
1009         DEF_CMD("monitor",      IFF_MONITOR,    setifflags),
1010         DEF_CMD("-monitor",     -IFF_MONITOR,   setifflags),
1011         DEF_CMD("staticarp",    IFF_STATICARP,  setifflags),
1012         DEF_CMD("-staticarp",   -IFF_STATICARP, setifflags),
1013         DEF_CMD("rxcsum",       IFCAP_RXCSUM,   setifcap),
1014         DEF_CMD("-rxcsum",      -IFCAP_RXCSUM,  setifcap),
1015         DEF_CMD("txcsum",       IFCAP_TXCSUM,   setifcap),
1016         DEF_CMD("-txcsum",      -IFCAP_TXCSUM,  setifcap),
1017         DEF_CMD("netcons",      IFCAP_NETCONS,  setifcap),
1018         DEF_CMD("-netcons",     -IFCAP_NETCONS, setifcap),
1019         DEF_CMD("polling",      IFCAP_POLLING,  setifcap),
1020         DEF_CMD("-polling",     -IFCAP_POLLING, setifcap),
1021         DEF_CMD("tso",          IFCAP_TSO,      setifcap),
1022         DEF_CMD("-tso",         -IFCAP_TSO,     setifcap),
1023         DEF_CMD("lro",          IFCAP_LRO,      setifcap),
1024         DEF_CMD("-lro",         -IFCAP_LRO,     setifcap),
1025         DEF_CMD("wol",          IFCAP_WOL,      setifcap),
1026         DEF_CMD("-wol",         -IFCAP_WOL,     setifcap),
1027         DEF_CMD("wol_ucast",    IFCAP_WOL_UCAST,        setifcap),
1028         DEF_CMD("-wol_ucast",   -IFCAP_WOL_UCAST,       setifcap),
1029         DEF_CMD("wol_mcast",    IFCAP_WOL_MCAST,        setifcap),
1030         DEF_CMD("-wol_mcast",   -IFCAP_WOL_MCAST,       setifcap),
1031         DEF_CMD("wol_magic",    IFCAP_WOL_MAGIC,        setifcap),
1032         DEF_CMD("-wol_magic",   -IFCAP_WOL_MAGIC,       setifcap),
1033         DEF_CMD("normal",       -IFF_LINK0,     setifflags),
1034         DEF_CMD("compress",     IFF_LINK0,      setifflags),
1035         DEF_CMD("noicmp",       IFF_LINK1,      setifflags),
1036         DEF_CMD_ARG("mtu",                      setifmtu),
1037         DEF_CMD_ARG("name",                     setifname),
1038 };
1039
1040 static __constructor void
1041 ifconfig_ctor(void)
1042 {
1043 #define N(a)    (sizeof(a) / sizeof(a[0]))
1044         int i;
1045
1046         for (i = 0; i < N(basic_cmds);  i++)
1047                 cmd_register(&basic_cmds[i]);
1048 #undef N
1049 }