libbb/interface.c

   1 /*
   2  * stolen from net-tools-1.59 and stripped down for busybox by
   3  *                      Erik Andersen <andersee@debian.org>
   4  *
   5  * Heavily modified by Manuel Novoa III       Mar 12, 2001
   6  *
   7  * Pruned unused code using KEEP_UNUSED define.
   8  * Added print_bytes_scaled function to reduce code size.
   9  * Added some (potentially) missing defines.
  10  * Improved display support for -a and for a named interface.
  11  *
  12  * -----------------------------------------------------------
  13  *
  14  * ifconfig   This file contains an implementation of the command
  15  *              that either displays or sets the characteristics of
  16  *              one or more of the system's networking interfaces.
  17  *
  18  * Version:     $Id: interface.c,v 1.15 2003/03/19 09:12:07 mjn3 Exp $
  19  *
  20  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  21  *              and others.  Copyright 1993 MicroWalt Corporation
  22  *
  23  *              This program is free software; you can redistribute it
  24  *              and/or  modify it under  the terms of  the GNU General
  25  *              Public  License as  published  by  the  Free  Software
  26  *              Foundation;  either  version 2 of the License, or  (at
  27  *              your option) any later version.
  28  *
  29  * Patched to support 'add' and 'del' keywords for INET(4) addresses
  30  * by Mrs. Brisby <mrs.brisby@nimh.org>
  31  *
  32  * {1.34} - 19980630 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  33  *                     - gettext instead of catgets for i18n
  34  *          10/1998  - Andi Kleen. Use interface list primitives.
  35  *          20001008 - Bernd Eckenfels, Patch from RH for setting mtu
  36  *                      (default AF was wrong)
  37  */
  38
  39 /* #define KEEP_UNUSED */
  40
  41 /*
  42  *
  43  * Protocol Families.
  44  *
  45  */
  46 #define HAVE_AFINET 1
  47 #undef HAVE_AFIPX
  48 #undef HAVE_AFATALK
  49 #undef HAVE_AFNETROM
  50 #undef HAVE_AFX25
  51 #undef HAVE_AFECONET
  52 #undef HAVE_AFASH
  53
  54 #ifdef CONFIG_FEATURE_IPV6
  55 # define HAVE_AFINET6 1
  56 #else
  57 # undef HAVE_AFINET6
  58 #endif
  59
  60 /*
  61  *
  62  * Device Hardware types.
  63  *
  64  */
  65 #define HAVE_HWETHER    1
  66 #define HAVE_HWPPP      1
  67 #undef HAVE_HWSLIP
  68
  69
  70 #include "inet_common.h"
  71 #include <stdio.h>
  72 #include <errno.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #include <unistd.h>
  76 #include <fcntl.h>
  77 #include <ctype.h>
  78 #include <sys/ioctl.h>
  79 #include <net/if.h>
  80 #include <net/if_arp.h>
  81 #include "libbb.h"
  82
  83 #define _(x) x
  84 #define _PATH_PROCNET_DEV               "/proc/net/dev"
  85 #define _PATH_PROCNET_IFINET6           "/proc/net/if_inet6"
  86 #define new(p) ((p) = xcalloc(1,sizeof(*(p))))
  87 #define KRELEASE(maj,min,patch) ((maj) * 65536 + (min)*256 + (patch))
  88
  89 static int procnetdev_vsn = 1;
  90
  91 /* Ugh.  But libc5 doesn't provide POSIX types.  */
  92 #include <asm/types.h>
  93
  94
  95 #ifdef HAVE_HWSLIP
  96 #include <net/if_slip.h>
  97 #endif
  98
  99 #if HAVE_AFINET6
 100
 101 #ifndef _LINUX_IN6_H
 102 /*
 103  *    This is in linux/include/net/ipv6.h.
 104  */
 105
 106 struct in6_ifreq {
 107         struct in6_addr ifr6_addr;
 108         __u32 ifr6_prefixlen;
 109         unsigned int ifr6_ifindex;
 110 };
 111
 112 #endif
 113
 114 #endif                                                  /* HAVE_AFINET6 */
 115
 116 #if HAVE_AFIPX
 117 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
 118 #include <netipx/ipx.h>
 119 #else
 120 #include "ipx.h"
 121 #endif
 122 #endif
 123
 124 /* Defines for glibc2.0 users. */
 125 #ifndef SIOCSIFTXQLEN
 126 #define SIOCSIFTXQLEN      0x8943
 127 #define SIOCGIFTXQLEN      0x8942
 128 #endif
 129
 130 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
 131 #ifndef ifr_qlen
 132 #define ifr_qlen        ifr_ifru.ifru_mtu
 133 #endif
 134
 135 #ifndef HAVE_TXQUEUELEN
 136 #define HAVE_TXQUEUELEN 1
 137 #endif
 138
 139 #ifndef IFF_DYNAMIC
 140 #define IFF_DYNAMIC     0x8000  /* dialup device with changing addresses */
 141 #endif
 142
 143 /* This structure defines protocol families and their handlers. */
 144 struct aftype {
 145         const char *name;
 146         const char *title;
 147         int af;
 148         int alen;
 149         char *(*print) (unsigned char *);
 150         char *(*sprint) (struct sockaddr *, int numeric);
 151         int (*input) (int type, char *bufp, struct sockaddr *);
 152         void (*herror) (char *text);
 153         int (*rprint) (int options);
 154         int (*rinput) (int typ, int ext, char **argv);
 155
 156         /* may modify src */
 157         int (*getmask) (char *src, struct sockaddr * mask, char *name);
 158
 159         int fd;
 160         char *flag_file;
 161 };
 162
 163 #ifdef KEEP_UNUSED
 164
 165 static int flag_unx;
 166
 167 #ifdef HAVE_AFIPX
 168 static int flag_ipx;
 169 #endif
 170 #ifdef HAVE_AFX25
 171 static int flag_ax25;
 172 #endif
 173 #ifdef HAVE_AFATALK
 174 static int flag_ddp;
 175 #endif
 176 #ifdef HAVE_AFNETROM
 177 static int flag_netrom;
 178 #endif
 179 static int flag_inet;
 180
 181 #ifdef HAVE_AFINET6
 182 static int flag_inet6;
 183 #endif
 184 #ifdef HAVE_AFECONET
 185 static int flag_econet;
 186 #endif
 187 #ifdef HAVE_AFX25
 188 static int flag_x25 = 0;
 189 #endif
 190 #ifdef HAVE_AFASH
 191 static int flag_ash;
 192 #endif
 193
 194
 195 static struct aftrans_t {
 196         char *alias;
 197         char *name;
 198         int *flag;
 199 } aftrans[] = {
 200
 201 #ifdef HAVE_AFX25
 202         {
 203         "ax25", "ax25", &flag_ax25},
 204 #endif
 205         {
 206         "ip", "inet", &flag_inet},
 207 #ifdef HAVE_AFINET6
 208         {
 209         "ip6", "inet6", &flag_inet6},
 210 #endif
 211 #ifdef HAVE_AFIPX
 212         {
 213         "ipx", "ipx", &flag_ipx},
 214 #endif
 215 #ifdef HAVE_AFATALK
 216         {
 217         "appletalk", "ddp", &flag_ddp},
 218 #endif
 219 #ifdef HAVE_AFNETROM
 220         {
 221         "netrom", "netrom", &flag_netrom},
 222 #endif
 223         {
 224         "inet", "inet", &flag_inet},
 225 #ifdef HAVE_AFINET6
 226         {
 227         "inet6", "inet6", &flag_inet6},
 228 #endif
 229 #ifdef HAVE_AFATALK
 230         {
 231         "ddp", "ddp", &flag_ddp},
 232 #endif
 233         {
 234         "unix", "unix", &flag_unx}, {
 235         "tcpip", "inet", &flag_inet},
 236 #ifdef HAVE_AFECONET
 237         {
 238         "econet", "ec", &flag_econet},
 239 #endif
 240 #ifdef HAVE_AFX25
 241         {
 242         "x25", "x25", &flag_x25},
 243 #endif
 244 #ifdef HAVE_AFASH
 245         {
 246         "ash", "ash", &flag_ash},
 247 #endif
 248         {
 249         0, 0, 0}
 250 };
 251
 252 static char afname[256] = "";
 253 #endif                                                  /* KEEP_UNUSED */
 254
 255 #if HAVE_AFUNIX
 256
 257 /* Display a UNIX domain address. */
 258 static char *UNIX_print(unsigned char *ptr)
 259 {
 260         return (ptr);
 261 }
 262
 263
 264 /* Display a UNIX domain address. */
 265 static char *UNIX_sprint(struct sockaddr *sap, int numeric)
 266 {
 267         static char buf[64];
 268
 269         if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 270                 return safe_strncpy(buf, _("[NONE SET]"), sizeof(buf));
 271         return (UNIX_print(sap->sa_data));
 272 }
 273
 274
 275 static struct aftype unix_aftype = {
 276         "unix", "UNIX Domain", AF_UNIX, 0,
 277         UNIX_print, UNIX_sprint, NULL, NULL,
 278         NULL, NULL, NULL,
 279         -1,
 280         "/proc/net/unix"
 281 };
 282 #endif                                                  /* HAVE_AFUNIX */
 283
 284 #if HAVE_AFINET
 285
 286 #ifdef KEEP_UNUSED
 287 static void INET_reserror(char *text)
 288 {
 289         herror(text);
 290 }
 291
 292 /* Display an Internet socket address. */
 293 static char *INET_print(unsigned char *ptr)
 294 {
 295         return (inet_ntoa((*(struct in_addr *) ptr)));
 296 }
 297 #endif                                                  /* KEEP_UNUSED */
 298
 299 /* Display an Internet socket address. */
 300 static char *INET_sprint(struct sockaddr *sap, int numeric)
 301 {
 302         static char buff[128];
 303
 304         if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 305                 return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));
 306
 307         if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap,
 308                                           numeric, 0xffffff00) != 0)
 309                 return (NULL);
 310
 311         return (buff);
 312 }
 313
 314 #ifdef KEEP_UNUSED
 315 static char *INET_sprintmask(struct sockaddr *sap, int numeric,
 316                                                          unsigned int netmask)
 317 {
 318         static char buff[128];
 319
 320         if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 321                 return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));
 322         if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap,
 323                                           numeric, netmask) != 0)
 324                 return (NULL);
 325         return (buff);
 326 }
 327
 328 static int INET_getsock(char *bufp, struct sockaddr *sap)
 329 {
 330         char *sp = bufp, *bp;
 331         unsigned int i;
 332         unsigned val;
 333         struct sockaddr_in *sin;
 334
 335         sin = (struct sockaddr_in *) sap;
 336         sin->sin_family = AF_INET;
 337         sin->sin_port = 0;
 338
 339         val = 0;
 340         bp = (char *) &val;
 341         for (i = 0; i < sizeof(sin->sin_addr.s_addr); i++) {
 342                 *sp = toupper(*sp);
 343
 344                 if ((*sp >= 'A') && (*sp <= 'F'))
 345                         bp[i] |= (int) (*sp - 'A') + 10;
 346                 else if ((*sp >= '0') && (*sp <= '9'))
 347                         bp[i] |= (int) (*sp - '0');
 348                 else
 349                         return (-1);
 350
 351                 bp[i] <<= 4;
 352                 sp++;
 353                 *sp = toupper(*sp);
 354
 355                 if ((*sp >= 'A') && (*sp <= 'F'))
 356                         bp[i] |= (int) (*sp - 'A') + 10;
 357                 else if ((*sp >= '0') && (*sp <= '9'))
 358                         bp[i] |= (int) (*sp - '0');
 359                 else
 360                         return (-1);
 361
 362                 sp++;
 363         }
 364         sin->sin_addr.s_addr = htonl(val);
 365
 366         return (sp - bufp);
 367 }
 368
 369 static int INET_input(int type, char *bufp, struct sockaddr *sap)
 370 {
 371         switch (type) {
 372         case 1:
 373                 return (INET_getsock(bufp, sap));
 374         case 256:
 375                 return (INET_resolve(bufp, (struct sockaddr_in *) sap, 1));
 376         default:
 377                 return (INET_resolve(bufp, (struct sockaddr_in *) sap, 0));
 378         }
 379 }
 380
 381 static int INET_getnetmask(char *adr, struct sockaddr *m, char *name)
 382 {
 383         struct sockaddr_in *mask = (struct sockaddr_in *) m;
 384         char *slash, *end;
 385         int prefix;
 386
 387         if ((slash = strchr(adr, '/')) == NULL)
 388                 return 0;
 389
 390         *slash++ = '\0';
 391         prefix = strtoul(slash, &end, 0);
 392         if (*end != '\0')
 393                 return -1;
 394
 395         if (name) {
 396                 sprintf(name, "/%d", prefix);
 397         }
 398         mask->sin_family = AF_INET;
 399         mask->sin_addr.s_addr = htonl(~(0xffffffffU >> prefix));
 400         return 1;
 401 }
 402 #endif                                                  /* KEEP_UNUSED */
 403
 404 static struct aftype inet_aftype = {
 405         "inet", "DARPA Internet", AF_INET, sizeof(unsigned long),
 406         NULL /* UNUSED INET_print */ , INET_sprint,
 407         NULL /* UNUSED INET_input */ , NULL /* UNUSED INET_reserror */ ,
 408         NULL /*INET_rprint */ , NULL /*INET_rinput */ ,
 409         NULL /* UNUSED INET_getnetmask */ ,
 410         -1,
 411         NULL
 412 };
 413
 414 #endif                                                  /* HAVE_AFINET */
 415
 416 #if HAVE_AFINET6
 417
 418 #ifdef KEEP_UNUSED
 419 static void INET6_reserror(char *text)
 420 {
 421         herror(text);
 422 }
 423
 424 /* Display an Internet socket address. */
 425 static char *INET6_print(unsigned char *ptr)
 426 {
 427         static char name[80];
 428
 429         inet_ntop(AF_INET6, (struct in6_addr *) ptr, name, 80);
 430         return name;
 431 }
 432 #endif                                                  /* KEEP_UNUSED */
 433
 434 /* Display an Internet socket address. */
 435 /* dirty! struct sockaddr usually doesn't suffer for inet6 addresses, fst. */
 436 static char *INET6_sprint(struct sockaddr *sap, int numeric)
 437 {
 438         static char buff[128];
 439
 440         if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 441                 return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));
 442         if (INET6_rresolve
 443                 (buff, sizeof(buff), (struct sockaddr_in6 *) sap, numeric) != 0)
 444                 return safe_strncpy(buff, _("[UNKNOWN]"), sizeof(buff));
 445         return (buff);
 446 }
 447
 448 #ifdef KEEP_UNUSED
 449 static int INET6_getsock(char *bufp, struct sockaddr *sap)
 450 {
 451         struct sockaddr_in6 *sin6;
 452
 453         sin6 = (struct sockaddr_in6 *) sap;
 454         sin6->sin6_family = AF_INET6;
 455         sin6->sin6_port = 0;
 456
 457         if (inet_pton(AF_INET6, bufp, sin6->sin6_addr.s6_addr) <= 0)
 458                 return (-1);
 459
 460         return 16;                      /* ?;) */
 461 }
 462
 463 static int INET6_input(int type, char *bufp, struct sockaddr *sap)
 464 {
 465         switch (type) {
 466         case 1:
 467                 return (INET6_getsock(bufp, sap));
 468         default:
 469                 return (INET6_resolve(bufp, (struct sockaddr_in6 *) sap));
 470         }
 471 }
 472 #endif                                                  /* KEEP_UNUSED */
 473
 474 static struct aftype inet6_aftype = {
 475         "inet6", "IPv6", AF_INET6, sizeof(struct in6_addr),
 476         NULL /* UNUSED INET6_print */ , INET6_sprint,
 477         NULL /* UNUSED INET6_input */ , NULL /* UNUSED INET6_reserror */ ,
 478         NULL /*INET6_rprint */ , NULL /*INET6_rinput */ ,
 479         NULL /* UNUSED INET6_getnetmask */ ,
 480         -1,
 481         NULL
 482 };
 483
 484 #endif                                                  /* HAVE_AFINET6 */
 485
 486 /* Display an UNSPEC address. */
 487 static char *UNSPEC_print(unsigned char *ptr)
 488 {
 489         static char buff[sizeof(struct sockaddr) * 3 + 1];
 490         char *pos;
 491         unsigned int i;
 492
 493         pos = buff;
 494         for (i = 0; i < sizeof(struct sockaddr); i++) {
 495                 /* careful -- not every libc's sprintf returns # bytes written */
 496                 sprintf(pos, "%02X-", (*ptr++ & 0377));
 497                 pos += 3;
 498         }
 499         /* Erase trailing "-".  Works as long as sizeof(struct sockaddr) != 0 */
 500         *--pos = '\0';
 501         return (buff);
 502 }
 503
 504 /* Display an UNSPEC socket address. */
 505 static char *UNSPEC_sprint(struct sockaddr *sap, int numeric)
 506 {
 507         static char buf[64];
 508
 509         if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
 510                 return safe_strncpy(buf, _("[NONE SET]"), sizeof(buf));
 511         return (UNSPEC_print(sap->sa_data));
 512 }
 513
 514 static struct aftype unspec_aftype = {
 515         "unspec", "UNSPEC", AF_UNSPEC, 0,
 516         UNSPEC_print, UNSPEC_sprint, NULL, NULL,
 517         NULL,
 518 };
 519
 520 static struct aftype *aftypes[] = {
 521 #if HAVE_AFUNIX
 522         &unix_aftype,
 523 #endif
 524 #if HAVE_AFINET
 525         &inet_aftype,
 526 #endif
 527 #if HAVE_AFINET6
 528         &inet6_aftype,
 529 #endif
 530 #if HAVE_AFAX25
 531         &ax25_aftype,
 532 #endif
 533 #if HAVE_AFNETROM
 534         &netrom_aftype,
 535 #endif
 536 #if HAVE_AFROSE
 537         &rose_aftype,
 538 #endif
 539 #if HAVE_AFIPX
 540         &ipx_aftype,
 541 #endif
 542 #if HAVE_AFATALK
 543         &ddp_aftype,
 544 #endif
 545 #if HAVE_AFECONET
 546         &ec_aftype,
 547 #endif
 548 #if HAVE_AFASH
 549         &ash_aftype,
 550 #endif
 551 #if HAVE_AFX25
 552         &x25_aftype,
 553 #endif
 554         &unspec_aftype,
 555         NULL
 556 };
 557
 558 #ifdef KEEP_UNUSED
 559 static short sVafinit = 0;
 560
 561 static void afinit()
 562 {
 563         unspec_aftype.title = _("UNSPEC");
 564 #if HAVE_AFUNIX
 565         unix_aftype.title = _("UNIX Domain");
 566 #endif
 567 #if HAVE_AFINET
 568         inet_aftype.title = _("DARPA Internet");
 569 #endif
 570 #if HAVE_AFINET6
 571         inet6_aftype.title = _("IPv6");
 572 #endif
 573 #if HAVE_AFAX25
 574         ax25_aftype.title = _("AMPR AX.25");
 575 #endif
 576 #if HAVE_AFNETROM
 577         netrom_aftype.title = _("AMPR NET/ROM");
 578 #endif
 579 #if HAVE_AFIPX
 580         ipx_aftype.title = _("Novell IPX");
 581 #endif
 582 #if HAVE_AFATALK
 583         ddp_aftype.title = _("Appletalk DDP");
 584 #endif
 585 #if HAVE_AFECONET
 586         ec_aftype.title = _("Econet");
 587 #endif
 588 #if HAVE_AFX25
 589         x25_aftype.title = _("CCITT X.25");
 590 #endif
 591 #if HAVE_AFROSE
 592         rose_aftype.title = _("AMPR ROSE");
 593 #endif
 594 #if HAVE_AFASH
 595         ash_aftype.title = _("Ash");
 596 #endif
 597         sVafinit = 1;
 598 }
 599
 600 static int aftrans_opt(const char *arg)
 601 {
 602         struct aftrans_t *paft;
 603         char *tmp1, *tmp2;
 604         char buf[256];
 605
 606         safe_strncpy(buf, arg, sizeof(buf));
 607
 608         tmp1 = buf;
 609
 610         while (tmp1) {
 611
 612                 tmp2 = strchr(tmp1, ',');
 613
 614                 if (tmp2)
 615                         *(tmp2++) = '\0';
 616
 617                 paft = aftrans;
 618                 for (paft = aftrans; paft->alias; paft++) {
 619                         if (strcmp(tmp1, paft->alias))
 620                                 continue;
 621                         if (strlen(paft->name) + strlen(afname) + 1 >= sizeof(afname)) {
 622                                 bb_error_msg(_("Too many address family arguments."));
 623                                 return (0);
 624                         }
 625                         if (paft->flag)
 626                                 (*paft->flag)++;
 627                         if (afname[0])
 628                                 strcat(afname, ",");
 629                         strcat(afname, paft->name);
 630                         break;
 631                 }
 632                 if (!paft->alias) {
 633                         bb_error_msg(_("Unknown address family `%s'."), tmp1);
 634                         return (1);
 635                 }
 636                 tmp1 = tmp2;
 637         }
 638
 639         return (0);
 640 }
 641
 642 /* set the default AF list from the program name or a constant value    */
 643 static void aftrans_def(char *tool, char *argv0, char *dflt)
 644 {
 645         char *tmp;
 646         char *buf;
 647
 648         strcpy(afname, dflt);
 649
 650         if (!(tmp = strrchr(argv0, '/')))
 651                 tmp = argv0;    /* no slash?! */
 652         else
 653                 tmp++;
 654
 655         if (!(buf = strdup(tmp)))
 656                 return;
 657
 658         if (strlen(tool) >= strlen(tmp)) {
 659                 free(buf);
 660                 return;
 661         }
 662         tmp = buf + (strlen(tmp) - strlen(tool));
 663
 664         if (strcmp(tmp, tool) != 0) {
 665                 free(buf);
 666                 return;
 667         }
 668         *tmp = '\0';
 669         if ((tmp = strchr(buf, '_')))
 670                 *tmp = '\0';
 671
 672         afname[0] = '\0';
 673         if (aftrans_opt(buf))
 674                 strcpy(afname, buf);
 675
 676         free(buf);
 677 }
 678
 679 /* Check our protocol family table for this family. */
 680 static struct aftype *get_aftype(const char *name)
 681 {
 682         struct aftype **afp;
 683
 684 #ifdef KEEP_UNUSED
 685         if (!sVafinit)
 686                 afinit();
 687 #endif                                                  /* KEEP_UNUSED */
 688
 689         afp = aftypes;
 690         while (*afp != NULL) {
 691                 if (!strcmp((*afp)->name, name))
 692                         return (*afp);
 693                 afp++;
 694         }
 695         if (strchr(name, ','))
 696                 bb_error_msg(_("Please don't supply more than one address family."));
 697         return (NULL);
 698 }
 699 #endif                                                  /* KEEP_UNUSED */
 700
 701 /* Check our protocol family table for this family. */
 702 static struct aftype *get_afntype(int af)
 703 {
 704         struct aftype **afp;
 705
 706 #ifdef KEEP_UNUSED
 707         if (!sVafinit)
 708                 afinit();
 709 #endif                                                  /* KEEP_UNUSED */
 710
 711         afp = aftypes;
 712         while (*afp != NULL) {
 713                 if ((*afp)->af == af)
 714                         return (*afp);
 715                 afp++;
 716         }
 717         return (NULL);
 718 }
 719
 720 /* Check our protocol family table for this family and return its socket */
 721 static int get_socket_for_af(int af)
 722 {
 723         struct aftype **afp;
 724
 725 #ifdef KEEP_UNUSED
 726         if (!sVafinit)
 727                 afinit();
 728 #endif                                                  /* KEEP_UNUSED */
 729
 730         afp = aftypes;
 731         while (*afp != NULL) {
 732                 if ((*afp)->af == af)
 733                         return (*afp)->fd;
 734                 afp++;
 735         }
 736         return -1;
 737 }
 738
 739 #ifdef KEEP_UNUSED
 740 /* type: 0=all, 1=getroute */
 741 static void print_aflist(int type)
 742 {
 743         int count = 0;
 744         char *txt;
 745         struct aftype **afp;
 746
 747 #ifdef KEEP_UNUSED
 748         if (!sVafinit)
 749                 afinit();
 750 #endif                                                  /* KEEP_UNUSED */
 751
 752         afp = aftypes;
 753         while (*afp != NULL) {
 754                 if ((type == 1 && ((*afp)->rprint == NULL)) || ((*afp)->af == 0)) {
 755                         afp++;
 756                         continue;
 757                 }
 758                 if ((count % 3) == 0)
 759                         fprintf(stderr, count ? "\n    " : "    ");
 760                 txt = (*afp)->name;
 761                 if (!txt)
 762                         txt = "..";
 763                 fprintf(stderr, "%s (%s) ", txt, _((*afp)->title));
 764                 count++;
 765                 afp++;
 766         }
 767         fprintf(stderr, "\n");
 768 }
 769 #endif                                                  /* KEEP_UNUSED */
 770
 771 struct user_net_device_stats {
 772         unsigned long long rx_packets;  /* total packets received       */
 773         unsigned long long tx_packets;  /* total packets transmitted    */
 774         unsigned long long rx_bytes;    /* total bytes received         */
 775         unsigned long long tx_bytes;    /* total bytes transmitted      */
 776         unsigned long rx_errors;        /* bad packets received         */
 777         unsigned long tx_errors;        /* packet transmit problems     */
 778         unsigned long rx_dropped;       /* no space in linux buffers    */
 779         unsigned long tx_dropped;       /* no space available in linux  */
 780         unsigned long rx_multicast;     /* multicast packets received   */
 781         unsigned long rx_compressed;
 782         unsigned long tx_compressed;
 783         unsigned long collisions;
 784
 785         /* detailed rx_errors: */
 786         unsigned long rx_length_errors;
 787         unsigned long rx_over_errors;   /* receiver ring buff overflow  */
 788         unsigned long rx_crc_errors;    /* recved pkt with crc error    */
 789         unsigned long rx_frame_errors;  /* recv'd frame alignment error */
 790         unsigned long rx_fifo_errors;   /* recv'r fifo overrun          */
 791         unsigned long rx_missed_errors; /* receiver missed packet     */
 792         /* detailed tx_errors */
 793         unsigned long tx_aborted_errors;
 794         unsigned long tx_carrier_errors;
 795         unsigned long tx_fifo_errors;
 796         unsigned long tx_heartbeat_errors;
 797         unsigned long tx_window_errors;
 798 };
 799
 800 struct interface {
 801         struct interface *next, *prev;
 802         char name[IFNAMSIZ];    /* interface name        */
 803         short type;                     /* if type               */
 804         short flags;            /* various flags         */
 805         int metric;                     /* routing metric        */
 806         int mtu;                        /* MTU value             */
 807         int tx_queue_len;       /* transmit queue length */
 808         struct ifmap map;       /* hardware setup        */
 809         struct sockaddr addr;   /* IP address            */
 810         struct sockaddr dstaddr;        /* P-P IP address        */
 811         struct sockaddr broadaddr;      /* IP broadcast address  */
 812         struct sockaddr netmask;        /* IP network mask       */
 813         struct sockaddr ipxaddr_bb;     /* IPX network address   */
 814         struct sockaddr ipxaddr_sn;     /* IPX network address   */
 815         struct sockaddr ipxaddr_e3;     /* IPX network address   */
 816         struct sockaddr ipxaddr_e2;     /* IPX network address   */
 817         struct sockaddr ddpaddr;        /* Appletalk DDP address */
 818         struct sockaddr ecaddr; /* Econet address        */
 819         int has_ip;
 820         int has_ipx_bb;
 821         int has_ipx_sn;
 822         int has_ipx_e3;
 823         int has_ipx_e2;
 824         int has_ax25;
 825         int has_ddp;
 826         int has_econet;
 827         char hwaddr[32];        /* HW address            */
 828         int statistics_valid;
 829         struct user_net_device_stats stats;     /* statistics            */
 830         int keepalive;          /* keepalive value for SLIP */
 831         int outfill;            /* outfill value for SLIP */
 832 };
 833
 834
 835 int interface_opt_a = 0;        /* show all interfaces          */
 836
 837 #ifdef KEEP_UNUSED
 838 static int opt_i = 0;   /* show the statistics          */
 839 static int opt_v = 0;   /* debugging output flag        */
 840
 841 static int addr_family = 0;     /* currently selected AF        */
 842 #endif                                                  /* KEEP_UNUSED */
 843
 844 static struct interface *int_list, *int_last;
 845 static int skfd = -1;   /* generic raw socket desc.     */
 846
 847
 848 static int sockets_open(int family)
 849 {
 850         struct aftype **aft;
 851         int sfd = -1;
 852         static int force = -1;
 853
 854         if (force < 0) {
 855                 force = 0;
 856                 if (get_kernel_revision() < KRELEASE(2, 1, 0))
 857                         force = 1;
 858                 if (access("/proc/net", R_OK))
 859                         force = 1;
 860         }
 861         for (aft = aftypes; *aft; aft++) {
 862                 struct aftype *af = *aft;
 863                 int type = SOCK_DGRAM;
 864
 865                 if (af->af == AF_UNSPEC)
 866                         continue;
 867                 if (family && family != af->af)
 868                         continue;
 869                 if (af->fd != -1) {
 870                         sfd = af->fd;
 871                         continue;
 872                 }
 873                 /* Check some /proc file first to not stress kmod */
 874                 if (!family && !force && af->flag_file) {
 875                         if (access(af->flag_file, R_OK))
 876                                 continue;
 877                 }
 878 #if HAVE_AFNETROM
 879                 if (af->af == AF_NETROM)
 880                         type = SOCK_SEQPACKET;
 881 #endif
 882 #if HAVE_AFX25
 883                 if (af->af == AF_X25)
 884                         type = SOCK_SEQPACKET;
 885 #endif
 886                 af->fd = socket(af->af, type, 0);
 887                 if (af->fd >= 0)
 888                         sfd = af->fd;
 889         }
 890         if (sfd < 0) {
 891                 bb_error_msg(_("No usable address families found."));
 892         }
 893         return sfd;
 894 }
 895
 896 /* like strcmp(), but knows about numbers */
 897 static int nstrcmp(const char *astr, const char *b)
 898 {
 899         const char *a = astr;
 900
 901         while (*a == *b) {
 902                 if (*a == '\0')
 903                         return 0;
 904                 a++;
 905                 b++;
 906         }
 907         if (isdigit(*a)) {
 908                 if (!isdigit(*b))
 909                         return -1;
 910                 while (a > astr) {
 911                         a--;
 912                         if (!isdigit(*a)) {
 913                                 a++;
 914                                 break;
 915                         }
 916                         if (!isdigit(*b))
 917                                 return -1;
 918                         b--;
 919                 }
 920                 return atoi(a) > atoi(b) ? 1 : -1;
 921         }
 922         return *a - *b;
 923 }
 924
 925 static struct interface *add_interface(char *name)
 926 {
 927         struct interface *ife, **nextp, *new;
 928
 929         for (ife = int_last; ife; ife = ife->prev) {
 930                 int n = nstrcmp(ife->name, name);
 931
 932                 if (n == 0)
 933                         return ife;
 934                 if (n < 0)
 935                         break;
 936         }
 937         new(new);
 938         safe_strncpy(new->name, name, IFNAMSIZ);
 939         nextp = ife ? &ife->next : &int_list;
 940         new->prev = ife;
 941         new->next = *nextp;
 942         if (new->next)
 943                 new->next->prev = new;
 944         else
 945                 int_last = new;
 946         *nextp = new;
 947         return new;
 948 }
 949
 950
 951 static int if_readconf(void)
 952 {
 953         int numreqs = 30;
 954         struct ifconf ifc;
 955         struct ifreq *ifr;
 956         int n, err = -1;
 957         int skfd2;
 958
 959         /* SIOCGIFCONF currently seems to only work properly on AF_INET sockets
 960            (as of 2.1.128) */
 961         skfd2 = get_socket_for_af(AF_INET);
 962         if (skfd2 < 0) {
 963                 bb_perror_msg(("warning: no inet socket available"));
 964                 /* Try to soldier on with whatever socket we can get hold of.  */
 965                 skfd2 = sockets_open(0);
 966                 if (skfd2 < 0)
 967                         return -1;
 968         }
 969
 970         ifc.ifc_buf = NULL;
 971         for (;;) {
 972                 ifc.ifc_len = sizeof(struct ifreq) * numreqs;
 973                 ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);
 974
 975                 if (ioctl(skfd2, SIOCGIFCONF, &ifc) < 0) {
 976                         perror("SIOCGIFCONF");
 977                         goto out;
 978                 }
 979                 if (ifc.ifc_len == sizeof(struct ifreq) * numreqs) {
 980                         /* assume it overflowed and try again */
 981                         numreqs += 10;
 982                         continue;
 983                 }
 984                 break;
 985         }
 986
 987         ifr = ifc.ifc_req;
 988         for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
 989                 add_interface(ifr->ifr_name);
 990                 ifr++;
 991         }
 992         err = 0;
 993
 994   out:
 995         free(ifc.ifc_buf);
 996         return err;
 997 }
 998
 999 static char *get_name(char *name, char *p)
1000 {
1001         while (isspace(*p))
1002                 p++;
1003         while (*p) {
1004                 if (isspace(*p))
1005                         break;
1006                 if (*p == ':') {        /* could be an alias */
1007                         char *dot = p, *dotname = name;
1008
1009                         *name++ = *p++;
1010                         while (isdigit(*p))
1011                                 *name++ = *p++;
1012                         if (*p != ':') {        /* it wasn't, backup */
1013                                 p = dot;
1014                                 name = dotname;
1015                         }
1016                         if (*p == '\0')
1017                                 return NULL;
1018                         p++;
1019                         break;
1020                 }
1021                 *name++ = *p++;
1022         }
1023         *name++ = '\0';
1024         return p;
1025 }
1026
1027 static int get_dev_fields(char *bp, struct interface *ife)
1028 {
1029         switch (procnetdev_vsn) {
1030         case 3:
1031                 sscanf(bp,
1032                            "%Lu %Lu %lu %lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu %lu",
1033                            &ife->stats.rx_bytes,
1034                            &ife->stats.rx_packets,
1035                            &ife->stats.rx_errors,
1036                            &ife->stats.rx_dropped,
1037                            &ife->stats.rx_fifo_errors,
1038                            &ife->stats.rx_frame_errors,
1039                            &ife->stats.rx_compressed,
1040                            &ife->stats.rx_multicast,
1041                            &ife->stats.tx_bytes,
1042                            &ife->stats.tx_packets,
1043                            &ife->stats.tx_errors,
1044                            &ife->stats.tx_dropped,
1045                            &ife->stats.tx_fifo_errors,
1046                            &ife->stats.collisions,
1047                            &ife->stats.tx_carrier_errors, &ife->stats.tx_compressed);
1048                 break;
1049         case 2:
1050                 sscanf(bp, "%Lu %Lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu",
1051                            &ife->stats.rx_bytes,
1052                            &ife->stats.rx_packets,
1053                            &ife->stats.rx_errors,
1054                            &ife->stats.rx_dropped,
1055                            &ife->stats.rx_fifo_errors,
1056                            &ife->stats.rx_frame_errors,
1057                            &ife->stats.tx_bytes,
1058                            &ife->stats.tx_packets,
1059                            &ife->stats.tx_errors,
1060                            &ife->stats.tx_dropped,
1061                            &ife->stats.tx_fifo_errors,
1062                            &ife->stats.collisions, &ife->stats.tx_carrier_errors);
1063                 ife->stats.rx_multicast = 0;
1064                 break;
1065         case 1:
1066                 sscanf(bp, "%Lu %lu %lu %lu %lu %Lu %lu %lu %lu %lu %lu",
1067                            &ife->stats.rx_packets,
1068                            &ife->stats.rx_errors,
1069                            &ife->stats.rx_dropped,
1070                            &ife->stats.rx_fifo_errors,
1071                            &ife->stats.rx_frame_errors,
1072                            &ife->stats.tx_packets,
1073                            &ife->stats.tx_errors,
1074                            &ife->stats.tx_dropped,
1075                            &ife->stats.tx_fifo_errors,
1076                            &ife->stats.collisions, &ife->stats.tx_carrier_errors);
1077                 ife->stats.rx_bytes = 0;
1078                 ife->stats.tx_bytes = 0;
1079                 ife->stats.rx_multicast = 0;
1080                 break;
1081         }
1082         return 0;
1083 }
1084
1085 static inline int procnetdev_version(char *buf)
1086 {
1087         if (strstr(buf, "compressed"))
1088                 return 3;
1089         if (strstr(buf, "bytes"))
1090                 return 2;
1091         return 1;
1092 }
1093
1094 static int if_readlist_proc(char *target)
1095 {
1096         static int proc_read;
1097         FILE *fh;
1098         char buf[512];
1099         struct interface *ife;
1100         int err;
1101
1102         if (proc_read)
1103                 return 0;
1104         if (!target)
1105                 proc_read = 1;
1106
1107         fh = fopen(_PATH_PROCNET_DEV, "r");
1108         if (!fh) {
1109                 bb_perror_msg(_("Warning: cannot open %s. Limited output."), _PATH_PROCNET_DEV);
1110                 return if_readconf();
1111         }
1112         fgets(buf, sizeof buf, fh);     /* eat line */
1113         fgets(buf, sizeof buf, fh);
1114
1115 #if 0                                   /* pretty, but can't cope with missing fields */
1116         fmt = proc_gen_fmt(_PATH_PROCNET_DEV, 1, fh, "face", "",        /* parsed separately */
1117                                            "bytes", "%lu",
1118                                            "packets", "%lu",
1119                                            "errs", "%lu",
1120                                            "drop", "%lu",
1121                                            "fifo", "%lu",
1122                                            "frame", "%lu",
1123                                            "compressed", "%lu",
1124                                            "multicast", "%lu",
1125                                            "bytes", "%lu",
1126                                            "packets", "%lu",
1127                                            "errs", "%lu",
1128                                            "drop", "%lu",
1129                                            "fifo", "%lu",
1130                                            "colls", "%lu",
1131                                            "carrier", "%lu", "compressed", "%lu", NULL);
1132         if (!fmt)
1133                 return -1;
1134 #else
1135         procnetdev_vsn = procnetdev_version(buf);
1136 #endif
1137
1138         err = 0;
1139         while (fgets(buf, sizeof buf, fh)) {
1140                 char *s, name[IFNAMSIZ];
1141
1142                 s = get_name(name, buf);
1143                 ife = add_interface(name);
1144                 get_dev_fields(s, ife);
1145                 ife->statistics_valid = 1;
1146                 if (target && !strcmp(target, name))
1147                         break;
1148         }
1149         if (ferror(fh)) {
1150                 perror(_PATH_PROCNET_DEV);
1151                 err = -1;
1152                 proc_read = 0;
1153         }
1154 #if 0
1155         free(fmt);
1156 #endif
1157         fclose(fh);
1158         return err;
1159 }
1160
1161 static int if_readlist(void)
1162 {
1163         int err = if_readlist_proc(NULL);
1164
1165         if (!err)
1166                 err = if_readconf();
1167         return err;
1168 }
1169
1170 static int for_all_interfaces(int (*doit) (struct interface *, void *),
1171                                                           void *cookie)
1172 {
1173         struct interface *ife;
1174
1175         if (!int_list && (if_readlist() < 0))
1176                 return -1;
1177         for (ife = int_list; ife; ife = ife->next) {
1178                 int err = doit(ife, cookie);
1179
1180                 if (err)
1181                         return err;
1182         }
1183         return 0;
1184 }
1185
1186 /* Support for fetching an IPX address */
1187
1188 #if HAVE_AFIPX
1189 static int ipx_getaddr(int sock, int ft, struct ifreq *ifr)
1190 {
1191         ((struct sockaddr_ipx *) &ifr->ifr_addr)->sipx_type = ft;
1192         return ioctl(sock, SIOCGIFADDR, ifr);
1193 }
1194 #endif
1195
1196
1197 /* Fetch the interface configuration from the kernel. */
1198 static int if_fetch(struct interface *ife)
1199 {
1200         struct ifreq ifr;
1201         int fd;
1202         char *ifname = ife->name;
1203
1204         strcpy(ifr.ifr_name, ifname);
1205         if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
1206                 return (-1);
1207         ife->flags = ifr.ifr_flags;
1208
1209         strcpy(ifr.ifr_name, ifname);
1210         if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
1211                 memset(ife->hwaddr, 0, 32);
1212         else
1213                 memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);
1214
1215         ife->type = ifr.ifr_hwaddr.sa_family;
1216
1217         strcpy(ifr.ifr_name, ifname);
1218         if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0)
1219                 ife->metric = 0;
1220         else
1221                 ife->metric = ifr.ifr_metric;
1222
1223         strcpy(ifr.ifr_name, ifname);
1224         if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
1225                 ife->mtu = 0;
1226         else
1227                 ife->mtu = ifr.ifr_mtu;
1228
1229 #ifdef HAVE_HWSLIP
1230         if (ife->type == ARPHRD_SLIP || ife->type == ARPHRD_CSLIP ||
1231                 ife->type == ARPHRD_SLIP6 || ife->type == ARPHRD_CSLIP6 ||
1232                 ife->type == ARPHRD_ADAPT) {
1233 #ifdef SIOCGOUTFILL
1234                 strcpy(ifr.ifr_name, ifname);
1235                 if (ioctl(skfd, SIOCGOUTFILL, &ifr) < 0)
1236                         ife->outfill = 0;
1237                 else
1238                         ife->outfill = (unsigned int) ifr.ifr_data;
1239 #endif
1240 #ifdef SIOCGKEEPALIVE
1241                 strcpy(ifr.ifr_name, ifname);
1242                 if (ioctl(skfd, SIOCGKEEPALIVE, &ifr) < 0)
1243                         ife->keepalive = 0;
1244                 else
1245                         ife->keepalive = (unsigned int) ifr.ifr_data;
1246 #endif
1247         }
1248 #endif
1249
1250         strcpy(ifr.ifr_name, ifname);
1251         if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0)
1252                 memset(&ife->map, 0, sizeof(struct ifmap));
1253         else
1254                 memcpy(&ife->map, &ifr.ifr_map, sizeof(struct ifmap));
1255
1256         strcpy(ifr.ifr_name, ifname);
1257         if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0)
1258                 memset(&ife->map, 0, sizeof(struct ifmap));
1259         else
1260                 ife->map = ifr.ifr_map;
1261
1262 #ifdef HAVE_TXQUEUELEN
1263         strcpy(ifr.ifr_name, ifname);
1264         if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) < 0)
1265                 ife->tx_queue_len = -1; /* unknown value */
1266         else
1267                 ife->tx_queue_len = ifr.ifr_qlen;
1268 #else
1269         ife->tx_queue_len = -1; /* unknown value */
1270 #endif
1271
1272 #if HAVE_AFINET
1273         /* IPv4 address? */
1274         fd = get_socket_for_af(AF_INET);
1275         if (fd >= 0) {
1276                 strcpy(ifr.ifr_name, ifname);
1277                 ifr.ifr_addr.sa_family = AF_INET;
1278                 if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
1279                         ife->has_ip = 1;
1280                         ife->addr = ifr.ifr_addr;
1281                         strcpy(ifr.ifr_name, ifname);
1282                         if (ioctl(fd, SIOCGIFDSTADDR, &ifr) < 0)
1283                                 memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
1284                         else
1285                                 ife->dstaddr = ifr.ifr_dstaddr;
1286
1287                         strcpy(ifr.ifr_name, ifname);
1288                         if (ioctl(fd, SIOCGIFBRDADDR, &ifr) < 0)
1289                                 memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
1290                         else
1291                                 ife->broadaddr = ifr.ifr_broadaddr;
1292
1293                         strcpy(ifr.ifr_name, ifname);
1294                         if (ioctl(fd, SIOCGIFNETMASK, &ifr) < 0)
1295                                 memset(&ife->netmask, 0, sizeof(struct sockaddr));
1296                         else
1297                                 ife->netmask = ifr.ifr_netmask;
1298                 } else
1299                         memset(&ife->addr, 0, sizeof(struct sockaddr));
1300         }
1301 #endif
1302
1303 #if HAVE_AFATALK
1304         /* DDP address maybe ? */
1305         fd = get_socket_for_af(AF_APPLETALK);
1306         if (fd >= 0) {
1307                 strcpy(ifr.ifr_name, ifname);
1308                 if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
1309                         ife->ddpaddr = ifr.ifr_addr;
1310                         ife->has_ddp = 1;
1311                 }
1312         }
1313 #endif
1314
1315 #if HAVE_AFIPX
1316         /* Look for IPX addresses with all framing types */
1317         fd = get_socket_for_af(AF_IPX);
1318         if (fd >= 0) {
1319                 strcpy(ifr.ifr_name, ifname);
1320                 if (!ipx_getaddr(fd, IPX_FRAME_ETHERII, &ifr)) {
1321                         ife->has_ipx_bb = 1;
1322                         ife->ipxaddr_bb = ifr.ifr_addr;
1323                 }
1324                 strcpy(ifr.ifr_name, ifname);
1325                 if (!ipx_getaddr(fd, IPX_FRAME_SNAP, &ifr)) {
1326                         ife->has_ipx_sn = 1;
1327                         ife->ipxaddr_sn = ifr.ifr_addr;
1328                 }
1329                 strcpy(ifr.ifr_name, ifname);
1330                 if (!ipx_getaddr(fd, IPX_FRAME_8023, &ifr)) {
1331                         ife->has_ipx_e3 = 1;
1332                         ife->ipxaddr_e3 = ifr.ifr_addr;
1333                 }
1334                 strcpy(ifr.ifr_name, ifname);
1335                 if (!ipx_getaddr(fd, IPX_FRAME_8022, &ifr)) {
1336                         ife->has_ipx_e2 = 1;
1337                         ife->ipxaddr_e2 = ifr.ifr_addr;
1338                 }
1339         }
1340 #endif
1341
1342 #if HAVE_AFECONET
1343         /* Econet address maybe? */
1344         fd = get_socket_for_af(AF_ECONET);
1345         if (fd >= 0) {
1346                 strcpy(ifr.ifr_name, ifname);
1347                 if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
1348                         ife->ecaddr = ifr.ifr_addr;
1349                         ife->has_econet = 1;
1350                 }
1351         }
1352 #endif
1353
1354         return 0;
1355 }
1356
1357
1358 static int do_if_fetch(struct interface *ife)
1359 {
1360         if (if_fetch(ife) < 0) {
1361                 char *errmsg;
1362
1363                 if (errno == ENODEV) {
1364                         /* Give better error message for this case. */
1365                         errmsg = _("Device not found");
1366                 } else {
1367                         errmsg = strerror(errno);
1368                 }
1369                 bb_error_msg(_("%s: error fetching interface information: %s\n"),
1370                                 ife->name, errmsg);
1371                 return -1;
1372         }
1373         return 0;
1374 }
1375
1376 /* This structure defines hardware protocols and their handlers. */
1377 struct hwtype {
1378         const char *name;
1379         const char *title;
1380         int type;
1381         int alen;
1382         char *(*print) (unsigned char *);
1383         int (*input) (char *, struct sockaddr *);
1384         int (*activate) (int fd);
1385         int suppress_null_addr;
1386 };
1387
1388 static struct hwtype unspec_hwtype = {
1389         "unspec", "UNSPEC", -1, 0,
1390         UNSPEC_print, NULL, NULL
1391 };
1392
1393 static struct hwtype loop_hwtype = {
1394         "loop", "Local Loopback", ARPHRD_LOOPBACK, 0,
1395         NULL, NULL, NULL
1396 };
1397
1398 #if HAVE_HWETHER
1399 #include <net/if_arp.h>
1400
1401 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
1402 #include <net/ethernet.h>
1403 #else
1404 #include <linux/if_ether.h>
1405 #endif
1406
1407 /* Display an Ethernet address in readable format. */
1408 static char *pr_ether(unsigned char *ptr)
1409 {
1410         static char buff[64];
1411
1412         snprintf(buff, sizeof(buff), "%02X:%02X:%02X:%02X:%02X:%02X",
1413                          (ptr[0] & 0377), (ptr[1] & 0377), (ptr[2] & 0377),
1414                          (ptr[3] & 0377), (ptr[4] & 0377), (ptr[5] & 0377)
1415                 );
1416         return (buff);
1417 }
1418
1419 #ifdef KEEP_UNUSED
1420 /* Input an Ethernet address and convert to binary. */
1421 static int in_ether(char *bufp, struct sockaddr *sap)
1422 {
1423         unsigned char *ptr;
1424         char c, *orig;
1425         int i;
1426         unsigned val;
1427
1428         sap->sa_family = ether_hwtype.type;
1429         ptr = sap->sa_data;
1430
1431         i = 0;
1432         orig = bufp;
1433         while ((*bufp != '\0') && (i < ETH_ALEN)) {
1434                 val = 0;
1435                 c = *bufp++;
1436                 if (isdigit(c))
1437                         val = c - '0';
1438                 else if (c >= 'a' && c <= 'f')
1439                         val = c - 'a' + 10;
1440                 else if (c >= 'A' && c <= 'F')
1441                         val = c - 'A' + 10;
1442                 else {
1443 #ifdef DEBUG
1444                         bb_error_msg(_("in_ether(%s): invalid ether address!\n"), orig);
1445 #endif
1446                         errno = EINVAL;
1447                         return (-1);
1448                 }
1449                 val <<= 4;
1450                 c = *bufp;
1451                 if (isdigit(c))
1452                         val |= c - '0';
1453                 else if (c >= 'a' && c <= 'f')
1454                         val |= c - 'a' + 10;
1455                 else if (c >= 'A' && c <= 'F')
1456                         val |= c - 'A' + 10;
1457                 else if (c == ':' || c == 0)
1458                         val >>= 4;
1459                 else {
1460 #ifdef DEBUG
1461                         bb_error_msg(_("in_ether(%s): invalid ether address!"), orig);
1462 #endif
1463                         errno = EINVAL;
1464                         return (-1);
1465                 }
1466                 if (c != 0)
1467                         bufp++;
1468                 *ptr++ = (unsigned char) (val & 0377);
1469                 i++;
1470
1471                 /* We might get a semicolon here - not required. */
1472                 if (*bufp == ':') {
1473 #ifdef DEBUG
1474                         if (i == ETH_ALEN) {
1475                                 bb_error_msg(_("in_ether(%s): trailing : ignored!"), orig);
1476                         }
1477 #endif
1478                         bufp++;
1479                 }
1480         }
1481
1482 #ifdef DEBUG
1483         /* That's it.  Any trailing junk? */
1484         if ((i == ETH_ALEN) && (*bufp != '\0')) {
1485                 bb_error_msg(_("in_ether(%s): trailing junk!"), orig);
1486                 errno = EINVAL;
1487                 return (-1);
1488         }
1489         bb_error_msg("in_ether(%s): %s", orig, pr_ether(sap->sa_data));
1490 #endif
1491
1492         return (0);
1493 }
1494 #endif                                                  /* KEEP_UNUSED */
1495
1496
1497 static struct hwtype ether_hwtype = {
1498         "ether", "Ethernet", ARPHRD_ETHER, ETH_ALEN,
1499         pr_ether, NULL /* UNUSED in_ether */ , NULL
1500 };
1501
1502
1503 #endif                                                  /* HAVE_HWETHER */
1504
1505
1506 #if HAVE_HWPPP
1507
1508 #include <net/if_arp.h>
1509
1510 #ifdef KEEP_UNUSED
1511 /* Start the PPP encapsulation on the file descriptor. */
1512 static int do_ppp(int fd)
1513 {
1514         bb_error_msg(_("You cannot start PPP with this program."));
1515         return -1;
1516 }
1517 #endif                                                  /* KEEP_UNUSED */
1518
1519 static struct hwtype ppp_hwtype = {
1520         "ppp", "Point-Point Protocol", ARPHRD_PPP, 0,
1521         NULL, NULL, NULL /* UNUSED do_ppp */ , 0
1522 };
1523
1524
1525 #endif                                                  /* HAVE_PPP */
1526
1527 static struct hwtype *hwtypes[] = {
1528
1529         &loop_hwtype,
1530
1531 #if HAVE_HWSLIP
1532         &slip_hwtype,
1533         &cslip_hwtype,
1534         &slip6_hwtype,
1535         &cslip6_hwtype,
1536         &adaptive_hwtype,
1537 #endif
1538 #if HAVE_HWSTRIP
1539         &strip_hwtype,
1540 #endif
1541 #if HAVE_HWASH
1542         &ash_hwtype,
1543 #endif
1544 #if HAVE_HWETHER
1545         &ether_hwtype,
1546 #endif
1547 #if HAVE_HWTR
1548         &tr_hwtype,
1549 #ifdef ARPHRD_IEEE802_TR
1550         &tr_hwtype1,
1551 #endif
1552 #endif
1553 #if HAVE_HWAX25
1554         &ax25_hwtype,
1555 #endif
1556 #if HAVE_HWNETROM
1557         &netrom_hwtype,
1558 #endif
1559 #if HAVE_HWROSE
1560         &rose_hwtype,
1561 #endif
1562 #if HAVE_HWTUNNEL
1563         &tunnel_hwtype,
1564 #endif
1565 #if HAVE_HWPPP
1566         &ppp_hwtype,
1567 #endif
1568 #if HAVE_HWHDLCLAPB
1569         &hdlc_hwtype,
1570         &lapb_hwtype,
1571 #endif
1572 #if HAVE_HWARC
1573         &arcnet_hwtype,
1574 #endif
1575 #if HAVE_HWFR
1576         &dlci_hwtype,
1577         &frad_hwtype,
1578 #endif
1579 #if HAVE_HWSIT
1580         &sit_hwtype,
1581 #endif
1582 #if HAVE_HWFDDI
1583         &fddi_hwtype,
1584 #endif
1585 #if HAVE_HWHIPPI
1586         &hippi_hwtype,
1587 #endif
1588 #if HAVE_HWIRDA
1589         &irda_hwtype,
1590 #endif
1591 #if HAVE_HWEC
1592         &ec_hwtype,
1593 #endif
1594 #if HAVE_HWX25
1595         &x25_hwtype,
1596 #endif
1597         &unspec_hwtype,
1598         NULL
1599 };
1600
1601 #ifdef KEEP_UNUSED
1602 static short sVhwinit = 0;
1603
1604 static void hwinit()
1605 {
1606         loop_hwtype.title = _("Local Loopback");
1607         unspec_hwtype.title = _("UNSPEC");
1608 #if HAVE_HWSLIP
1609         slip_hwtype.title = _("Serial Line IP");
1610         cslip_hwtype.title = _("VJ Serial Line IP");
1611         slip6_hwtype.title = _("6-bit Serial Line IP");
1612         cslip6_hwtype.title = _("VJ 6-bit Serial Line IP");
1613         adaptive_hwtype.title = _("Adaptive Serial Line IP");
1614 #endif
1615 #if HAVE_HWETHER
1616         ether_hwtype.title = _("Ethernet");
1617 #endif
1618 #if HAVE_HWASH
1619         ash_hwtype.title = _("Ash");
1620 #endif
1621 #if HAVE_HWFDDI
1622         fddi_hwtype.title = _("Fiber Distributed Data Interface");
1623 #endif
1624 #if HAVE_HWHIPPI
1625         hippi_hwtype.title = _("HIPPI");
1626 #endif
1627 #if HAVE_HWAX25
1628         ax25_hwtype.title = _("AMPR AX.25");
1629 #endif
1630 #if HAVE_HWROSE
1631         rose_hwtype.title = _("AMPR ROSE");
1632 #endif
1633 #if HAVE_HWNETROM
1634         netrom_hwtype.title = _("AMPR NET/ROM");
1635 #endif
1636 #if HAVE_HWX25
1637         x25_hwtype.title = _("generic X.25");
1638 #endif
1639 #if HAVE_HWTUNNEL
1640         tunnel_hwtype.title = _("IPIP Tunnel");
1641 #endif
1642 #if HAVE_HWPPP
1643         ppp_hwtype.title = _("Point-to-Point Protocol");
1644 #endif
1645 #if HAVE_HWHDLCLAPB
1646         hdlc_hwtype.title = _("(Cisco)-HDLC");
1647         lapb_hwtype.title = _("LAPB");
1648 #endif
1649 #if HAVE_HWARC
1650         arcnet_hwtype.title = _("ARCnet");
1651 #endif
1652 #if HAVE_HWFR
1653         dlci_hwtype.title = _("Frame Relay DLCI");
1654         frad_hwtype.title = _("Frame Relay Access Device");
1655 #endif
1656 #if HAVE_HWSIT
1657         sit_hwtype.title = _("IPv6-in-IPv4");
1658 #endif
1659 #if HAVE_HWIRDA
1660         irda_hwtype.title = _("IrLAP");
1661 #endif
1662 #if HAVE_HWTR
1663         tr_hwtype.title = _("16/4 Mbps Token Ring");
1664 #ifdef ARPHRD_IEEE802_TR
1665         tr_hwtype1.title = _("16/4 Mbps Token Ring (New)");
1666 #endif
1667 #endif
1668 #if HAVE_HWEC
1669         ec_hwtype.title = _("Econet");
1670 #endif
1671         sVhwinit = 1;
1672 }
1673 #endif                                                  /* KEEP_UNUSED */
1674
1675 #ifdef IFF_PORTSEL
1676 static const char *if_port_text[][4] = {
1677         /* Keep in step with <linux/netdevice.h> */
1678         {"unknown", NULL, NULL, NULL},
1679         {"10base2", "bnc", "coax", NULL},
1680         {"10baseT", "utp", "tpe", NULL},
1681         {"AUI", "thick", "db15", NULL},
1682         {"100baseT", NULL, NULL, NULL},
1683         {"100baseTX", NULL, NULL, NULL},
1684         {"100baseFX", NULL, NULL, NULL},
1685         {NULL, NULL, NULL, NULL},
1686 };
1687 #endif
1688
1689 /* Check our hardware type table for this type. */
1690 static struct hwtype *get_hwntype(int type)
1691 {
1692         struct hwtype **hwp;
1693
1694 #ifdef KEEP_UNUSED
1695         if (!sVhwinit)
1696                 hwinit();
1697 #endif                                                  /* KEEP_UNUSED */
1698
1699         hwp = hwtypes;
1700         while (*hwp != NULL) {
1701                 if ((*hwp)->type == type)
1702                         return (*hwp);
1703                 hwp++;
1704         }
1705         return (NULL);
1706 }
1707
1708 /* return 1 if address is all zeros */
1709 static int hw_null_address(struct hwtype *hw, void *ap)
1710 {
1711         unsigned int i;
1712         unsigned char *address = (unsigned char *) ap;
1713
1714         for (i = 0; i < hw->alen; i++)
1715                 if (address[i])
1716                         return 0;
1717         return 1;
1718 }
1719
1720 static const char TRext[] = "\0\0k\0M";
1721
1722 static void print_bytes_scaled(unsigned long long ull, const char *end)
1723 {
1724         unsigned long long int_part;
1725         unsigned long frac_part;
1726         const char *ext;
1727         int i;
1728
1729         frac_part = 0;
1730         ext = TRext;
1731         int_part = ull;
1732         for (i = 0; i < 2; i++) {
1733                 if (int_part >= 1024) {
1734                         frac_part = ((int_part % 1024) * 10) / 1024;
1735                         int_part /= 1024;
1736                         ext += 2;       /* Kb, Mb */
1737                 }
1738         }
1739
1740         printf("X bytes:%Lu (%Lu.%lu %siB)%s", ull, int_part, frac_part, ext, end);
1741 }
1742
1743 static void ife_print(struct interface *ptr)
1744 {
1745         struct aftype *ap;
1746         struct hwtype *hw;
1747         int hf;
1748         int can_compress = 0;
1749
1750 #if HAVE_AFIPX
1751         static struct aftype *ipxtype = NULL;
1752 #endif
1753 #if HAVE_AFECONET
1754         static struct aftype *ectype = NULL;
1755 #endif
1756 #if HAVE_AFATALK
1757         static struct aftype *ddptype = NULL;
1758 #endif
1759 #if HAVE_AFINET6
1760         FILE *f;
1761         char addr6[40], devname[20];
1762         struct sockaddr_in6 sap;
1763         int plen, scope, dad_status, if_idx;
1764         char addr6p[8][5];
1765 #endif
1766
1767         ap = get_afntype(ptr->addr.sa_family);
1768         if (ap == NULL)
1769                 ap = get_afntype(0);
1770
1771         hf = ptr->type;
1772
1773         if (hf == ARPHRD_CSLIP || hf == ARPHRD_CSLIP6)
1774                 can_compress = 1;
1775
1776         hw = get_hwntype(hf);
1777         if (hw == NULL)
1778                 hw = get_hwntype(-1);
1779
1780         printf(_("%-9.9s Link encap:%s  "), ptr->name, _(hw->title));
1781         /* For some hardware types (eg Ash, ATM) we don't print the
1782            hardware address if it's null.  */
1783         if (hw->print != NULL && (!(hw_null_address(hw, ptr->hwaddr) &&
1784                                                                 hw->suppress_null_addr)))
1785                 printf(_("HWaddr %s  "), hw->print(ptr->hwaddr));
1786 #ifdef IFF_PORTSEL
1787         if (ptr->flags & IFF_PORTSEL) {
1788                 printf(_("Media:%s"), if_port_text[ptr->map.port][0]);
1789                 if (ptr->flags & IFF_AUTOMEDIA)
1790                         printf(_("(auto)"));
1791         }
1792 #endif
1793         printf("\n");
1794
1795 #if HAVE_AFINET
1796         if (ptr->has_ip) {
1797                 printf(_("          %s addr:%s "), ap->name,
1798                            ap->sprint(&ptr->addr, 1));
1799                 if (ptr->flags & IFF_POINTOPOINT) {
1800                         printf(_(" P-t-P:%s "), ap->sprint(&ptr->dstaddr, 1));
1801                 }
1802                 if (ptr->flags & IFF_BROADCAST) {
1803                         printf(_(" Bcast:%s "), ap->sprint(&ptr->broadaddr, 1));
1804                 }
1805                 printf(_(" Mask:%s\n"), ap->sprint(&ptr->netmask, 1));
1806         }
1807 #endif
1808
1809 #if HAVE_AFINET6
1810
1811 #define IPV6_ADDR_ANY           0x0000U
1812
1813 #define IPV6_ADDR_UNICAST       0x0001U
1814 #define IPV6_ADDR_MULTICAST     0x0002U
1815 #define IPV6_ADDR_ANYCAST       0x0004U
1816
1817 #define IPV6_ADDR_LOOPBACK      0x0010U
1818 #define IPV6_ADDR_LINKLOCAL     0x0020U
1819 #define IPV6_ADDR_SITELOCAL     0x0040U
1820
1821 #define IPV6_ADDR_COMPATv4      0x0080U
1822
1823 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
1824
1825 #define IPV6_ADDR_MAPPED        0x1000U
1826 #define IPV6_ADDR_RESERVED      0x2000U /* reserved address space */
1827
1828         if ((f = fopen(_PATH_PROCNET_IFINET6, "r")) != NULL) {
1829                 while (fscanf
1830                            (f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
1831                                 addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4],
1832                                 addr6p[5], addr6p[6], addr6p[7], &if_idx, &plen, &scope,
1833                                 &dad_status, devname) != EOF) {
1834                         if (!strcmp(devname, ptr->name)) {
1835                                 sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
1836                                                 addr6p[0], addr6p[1], addr6p[2], addr6p[3],
1837                                                 addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
1838                                 inet_pton(AF_INET6, addr6,
1839                                                   (struct sockaddr *) &sap.sin6_addr);
1840                                 sap.sin6_family = AF_INET6;
1841                                 printf(_("          inet6 addr: %s/%d"),
1842                                            inet6_aftype.sprint((struct sockaddr *) &sap, 1),
1843                                            plen);
1844                                 printf(_(" Scope:"));
1845                                 switch (scope & IPV6_ADDR_SCOPE_MASK) {
1846                                 case 0:
1847                                         printf(_("Global"));
1848                                         break;
1849                                 case IPV6_ADDR_LINKLOCAL:
1850                                         printf(_("Link"));
1851                                         break;
1852                                 case IPV6_ADDR_SITELOCAL:
1853                                         printf(_("Site"));
1854                                         break;
1855                                 case IPV6_ADDR_COMPATv4:
1856                                         printf(_("Compat"));
1857                                         break;
1858                                 case IPV6_ADDR_LOOPBACK:
1859                                         printf(_("Host"));
1860                                         break;
1861                                 default:
1862                                         printf(_("Unknown"));
1863                                 }
1864                                 printf("\n");
1865                         }
1866                 }
1867                 fclose(f);
1868         }
1869 #endif
1870
1871 #if HAVE_AFIPX
1872         if (ipxtype == NULL)
1873                 ipxtype = get_afntype(AF_IPX);
1874
1875         if (ipxtype != NULL) {
1876                 if (ptr->has_ipx_bb)
1877                         printf(_("          IPX/Ethernet II addr:%s\n"),
1878                                    ipxtype->sprint(&ptr->ipxaddr_bb, 1));
1879                 if (ptr->has_ipx_sn)
1880                         printf(_("          IPX/Ethernet SNAP addr:%s\n"),
1881                                    ipxtype->sprint(&ptr->ipxaddr_sn, 1));
1882                 if (ptr->has_ipx_e2)
1883                         printf(_("          IPX/Ethernet 802.2 addr:%s\n"),
1884                                    ipxtype->sprint(&ptr->ipxaddr_e2, 1));
1885                 if (ptr->has_ipx_e3)
1886                         printf(_("          IPX/Ethernet 802.3 addr:%s\n"),
1887                                    ipxtype->sprint(&ptr->ipxaddr_e3, 1));
1888         }
1889 #endif
1890
1891 #if HAVE_AFATALK
1892         if (ddptype == NULL)
1893                 ddptype = get_afntype(AF_APPLETALK);
1894         if (ddptype != NULL) {
1895                 if (ptr->has_ddp)
1896                         printf(_("          EtherTalk Phase 2 addr:%s\n"),
1897                                    ddptype->sprint(&ptr->ddpaddr, 1));
1898         }
1899 #endif
1900
1901 #if HAVE_AFECONET
1902         if (ectype == NULL)
1903                 ectype = get_afntype(AF_ECONET);
1904         if (ectype != NULL) {
1905                 if (ptr->has_econet)
1906                         printf(_("          econet addr:%s\n"),
1907                                    ectype->sprint(&ptr->ecaddr, 1));
1908         }
1909 #endif
1910
1911         printf("          ");
1912         /* DONT FORGET TO ADD THE FLAGS IN ife_print_short, too */
1913         if (ptr->flags == 0)
1914                 printf(_("[NO FLAGS] "));
1915         if (ptr->flags & IFF_UP)
1916                 printf(_("UP "));
1917         if (ptr->flags & IFF_BROADCAST)
1918                 printf(_("BROADCAST "));
1919         if (ptr->flags & IFF_DEBUG)
1920                 printf(_("DEBUG "));
1921         if (ptr->flags & IFF_LOOPBACK)
1922                 printf(_("LOOPBACK "));
1923         if (ptr->flags & IFF_POINTOPOINT)
1924                 printf(_("POINTOPOINT "));
1925         if (ptr->flags & IFF_NOTRAILERS)
1926                 printf(_("NOTRAILERS "));
1927         if (ptr->flags & IFF_RUNNING)
1928                 printf(_("RUNNING "));
1929         if (ptr->flags & IFF_NOARP)
1930                 printf(_("NOARP "));
1931         if (ptr->flags & IFF_PROMISC)
1932                 printf(_("PROMISC "));
1933         if (ptr->flags & IFF_ALLMULTI)
1934                 printf(_("ALLMULTI "));
1935         if (ptr->flags & IFF_SLAVE)
1936                 printf(_("SLAVE "));
1937         if (ptr->flags & IFF_MASTER)
1938                 printf(_("MASTER "));
1939         if (ptr->flags & IFF_MULTICAST)
1940                 printf(_("MULTICAST "));
1941 #ifdef HAVE_DYNAMIC
1942         if (ptr->flags & IFF_DYNAMIC)
1943                 printf(_("DYNAMIC "));
1944 #endif
1945         /* DONT FORGET TO ADD THE FLAGS IN ife_print_short */
1946         printf(_(" MTU:%d  Metric:%d"), ptr->mtu, ptr->metric ? ptr->metric : 1);
1947 #ifdef SIOCSKEEPALIVE
1948         if (ptr->outfill || ptr->keepalive)
1949                 printf(_("  Outfill:%d  Keepalive:%d"), ptr->outfill, ptr->keepalive);
1950 #endif
1951         printf("\n");
1952
1953         /* If needed, display the interface statistics. */
1954
1955         if (ptr->statistics_valid) {
1956                 /* XXX: statistics are currently only printed for the primary address,
1957                  *      not for the aliases, although strictly speaking they're shared
1958                  *      by all addresses.
1959                  */
1960                 printf("          ");
1961
1962                 printf(_
1963                            ("RX packets:%Lu errors:%lu dropped:%lu overruns:%lu frame:%lu\n"),
1964                            ptr->stats.rx_packets, ptr->stats.rx_errors,
1965                            ptr->stats.rx_dropped, ptr->stats.rx_fifo_errors,
1966                            ptr->stats.rx_frame_errors);
1967                 if (can_compress)
1968                         printf(_("             compressed:%lu\n"),
1969                                    ptr->stats.rx_compressed);
1970                 printf("          ");
1971                 printf(_
1972                            ("TX packets:%Lu errors:%lu dropped:%lu overruns:%lu carrier:%lu\n"),
1973                            ptr->stats.tx_packets, ptr->stats.tx_errors,
1974                            ptr->stats.tx_dropped, ptr->stats.tx_fifo_errors,
1975                            ptr->stats.tx_carrier_errors);
1976                 printf(_("          collisions:%lu "), ptr->stats.collisions);
1977                 if (can_compress)
1978                         printf(_("compressed:%lu "), ptr->stats.tx_compressed);
1979                 if (ptr->tx_queue_len != -1)
1980                         printf(_("txqueuelen:%d "), ptr->tx_queue_len);
1981                 printf("\n          R");
1982                 print_bytes_scaled(ptr->stats.rx_bytes, "  T");
1983                 print_bytes_scaled(ptr->stats.tx_bytes, "\n");
1984
1985         }
1986
1987         if ((ptr->map.irq || ptr->map.mem_start || ptr->map.dma ||
1988                  ptr->map.base_addr)) {
1989                 printf("          ");
1990                 if (ptr->map.irq)
1991                         printf(_("Interrupt:%d "), ptr->map.irq);
1992                 if (ptr->map.base_addr >= 0x100)        /* Only print devices using it for
1993                                                                                            I/O maps */
1994                         printf(_("Base address:0x%lx "),
1995                                    (unsigned long) ptr->map.base_addr);
1996                 if (ptr->map.mem_start) {
1997                         printf(_("Memory:%lx-%lx "), ptr->map.mem_start,
1998                                    ptr->map.mem_end);
1999                 }
2000                 if (ptr->map.dma)
2001                         printf(_("DMA chan:%x "), ptr->map.dma);
2002                 printf("\n");
2003         }
2004         printf("\n");
2005 }
2006
2007
2008 static int do_if_print(struct interface *ife, void *cookie)
2009 {
2010         int *opt_a = (int *) cookie;
2011         int res;
2012
2013         res = do_if_fetch(ife);
2014         if (res >= 0) {
2015                 if ((ife->flags & IFF_UP) || *opt_a)
2016                         ife_print(ife);
2017         }
2018         return res;
2019 }
2020
2021 static struct interface *lookup_interface(char *name)
2022 {
2023         struct interface *ife = NULL;
2024
2025         if (if_readlist_proc(name) < 0)
2026                 return NULL;
2027         ife = add_interface(name);
2028         return ife;
2029 }
2030
2031 /* for ipv4 add/del modes */
2032 static int if_print(char *ifname)
2033 {
2034         int res;
2035
2036         if (!ifname) {
2037                 res = for_all_interfaces(do_if_print, &interface_opt_a);
2038         } else {
2039                 struct interface *ife;
2040
2041                 ife = lookup_interface(ifname);
2042                 res = do_if_fetch(ife);
2043                 if (res >= 0)
2044                         ife_print(ife);
2045         }
2046         return res;
2047 }
2048
2049 int display_interfaces(char *ifname)
2050 {
2051         int status;
2052
2053         /* Create a channel to the NET kernel. */
2054         if ((skfd = sockets_open(0)) < 0) {
2055                 bb_perror_msg_and_die("socket");
2056         }
2057
2058         /* Do we have to show the current setup? */
2059         status = if_print(ifname);
2060         close(skfd);
2061         exit(status < 0);
2062 }