lib/roken/getifaddrs.c

   1 /*
   2  * Copyright (c) 2000 - 2002, 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35 #include "roken.h"
  36
  37 #ifdef __osf__
  38 /* hate */
  39 struct rtentry;
  40 struct mbuf;
  41 #endif
  42 #ifdef HAVE_NET_IF_H
  43 #include <net/if.h>
  44 #endif
  45
  46 #ifdef HAVE_SYS_SOCKIO_H
  47 #include <sys/sockio.h>
  48 #endif /* HAVE_SYS_SOCKIO_H */
  49
  50 #ifdef HAVE_NETINET_IN6_VAR_H
  51 #include <netinet/in6_var.h>
  52 #endif /* HAVE_NETINET_IN6_VAR_H */
  53
  54 #include <ifaddrs.h>
  55
  56 #ifdef __hpux
  57 #define lifconf if_laddrconf
  58 #define lifc_len iflc_len
  59 #define lifc_buf iflc_buf
  60 #define lifc_req iflc_req
  61
  62 #define lifreq if_laddrreq
  63 #define lifr_addr iflr_addr
  64 #define lifr_name iflr_name
  65 #define lifr_dstaddr iflr_dstaddr
  66 #define lifr_broadaddr iflr_broadaddr
  67 #define lifr_flags iflr_flags
  68 #define lifr_index iflr_index
  69 #endif
  70
  71 #ifdef AF_NETLINK
  72
  73 /*
  74  * The linux - AF_NETLINK version of getifaddrs - from Usagi.
  75  * Linux does not return v6 addresses from SIOCGIFCONF.
  76  */
  77
  78 /* $USAGI: ifaddrs.c,v 1.18 2002/03/06 01:50:46 yoshfuji Exp $ */
  79
  80 /**************************************************************************
  81  * ifaddrs.c
  82  * Copyright (C)2000 Hideaki YOSHIFUJI, All Rights Reserved.
  83  *
  84  * Redistribution and use in source and binary forms, with or without
  85  * modification, are permitted provided that the following conditions
  86  * are met:
  87  * 1. Redistributions of source code must retain the above copyright
  88  *    notice, this list of conditions and the following disclaimer.
  89  * 2. Redistributions in binary form must reproduce the above copyright
  90  *    notice, this list of conditions and the following disclaimer in the
  91  *    documentation and/or other materials provided with the distribution.
  92  * 3. Neither the name of the author nor the names of its contributors
  93  *    may be used to endorse or promote products derived from this software
  94  *    without specific prior written permission.
  95  *
  96  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  97  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  98  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  99  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 100  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 101  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 102  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 103  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 104  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 105  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 106  * SUCH DAMAGE.
 107  */
 108
 109 #include "config.h"
 110
 111 #include <string.h>
 112 #include <time.h>
 113 #include <malloc.h>
 114 #include <errno.h>
 115 #include <unistd.h>
 116
 117 #include <sys/socket.h>
 118 #include <asm/types.h>
 119 #include <linux/netlink.h>
 120 #include <linux/rtnetlink.h>
 121 #include <sys/types.h>
 122 #include <sys/socket.h>
 123 #include <sys/poll.h>
 124 #include <netpacket/packet.h>
 125 #include <net/ethernet.h>     /* the L2 protocols */
 126 #include <sys/uio.h>
 127 #include <net/if.h>
 128 #include <net/if_arp.h>
 129 #include <ifaddrs.h>
 130 #include <netinet/in.h>
 131
 132 #define __set_errno(e) (errno = (e))
 133 #define __close(fd) (close(fd))
 134 #undef ifa_broadaddr
 135 #define ifa_broadaddr ifa_dstaddr
 136 #define IFA_NETMASK
 137
 138 /* ====================================================================== */
 139 struct nlmsg_list{
 140     struct nlmsg_list *nlm_next;
 141     struct nlmsghdr *nlh;
 142     int size;
 143     time_t seq;
 144 };
 145
 146 struct rtmaddr_ifamap {
 147   void *address;
 148   void *local;
 149 #ifdef IFA_NETMASK
 150   void *netmask;
 151 #endif
 152   void *broadcast;
 153 #ifdef HAVE_IFADDRS_IFA_ANYCAST
 154   void *anycast;
 155 #endif
 156   int address_len;
 157   int local_len;
 158 #ifdef IFA_NETMASK
 159   int netmask_len;
 160 #endif
 161   int broadcast_len;
 162 #ifdef HAVE_IFADDRS_IFA_ANYCAST
 163   int anycast_len;
 164 #endif
 165 };
 166
 167 /* ====================================================================== */
 168 static size_t
 169 ifa_sa_len(sa_family_t family, int len)
 170 {
 171   size_t size;
 172   switch(family){
 173   case AF_INET:
 174     size = sizeof(struct sockaddr_in);
 175     break;
 176   case AF_INET6:
 177     size = sizeof(struct sockaddr_in6);
 178     break;
 179   case AF_PACKET:
 180     size = (size_t)(((struct sockaddr_ll *)NULL)->sll_addr) + len;
 181     if (size < sizeof(struct sockaddr_ll))
 182       size = sizeof(struct sockaddr_ll);
 183     break;
 184   default:
 185     size = (size_t)(((struct sockaddr *)NULL)->sa_data) + len;
 186     if (size < sizeof(struct sockaddr))
 187       size = sizeof(struct sockaddr);
 188     break;
 189   }
 190   return size;
 191 }
 192
 193 static void
 194 ifa_make_sockaddr(sa_family_t family,
 195                   struct sockaddr *sa,
 196                   void *p, size_t len,
 197                   uint32_t scope, uint32_t scopeid)
 198 {
 199   if (sa == NULL) return;
 200   switch(family){
 201   case AF_INET:
 202     memcpy(&((struct sockaddr_in*)sa)->sin_addr, (char *)p, len);
 203     break;
 204   case AF_INET6:
 205     memcpy(&((struct sockaddr_in6*)sa)->sin6_addr, (char *)p, len);
 206     if (IN6_IS_ADDR_LINKLOCAL(p) ||
 207         IN6_IS_ADDR_MC_LINKLOCAL(p)){
 208       ((struct sockaddr_in6*)sa)->sin6_scope_id = scopeid;
 209     }
 210     break;
 211   case AF_PACKET:
 212     memcpy(((struct sockaddr_ll*)sa)->sll_addr, (char *)p, len);
 213     ((struct sockaddr_ll*)sa)->sll_halen = len;
 214     break;
 215   default:
 216     memcpy(sa->sa_data, p, len);        /*XXX*/
 217     break;
 218   }
 219   sa->sa_family = family;
 220 #ifdef HAVE_SOCKADDR_SA_LEN
 221   sa->sa_len = ifa_sa_len(family, len);
 222 #endif
 223 }
 224
 225 #ifndef IFA_NETMASK
 226 static struct sockaddr *
 227 ifa_make_sockaddr_mask(sa_family_t family,
 228                        struct sockaddr *sa,
 229                        uint32_t prefixlen)
 230 {
 231   int i;
 232   char *p = NULL, c;
 233   uint32_t max_prefixlen = 0;
 234
 235   if (sa == NULL) return NULL;
 236   switch(family){
 237   case AF_INET:
 238     memset(&((struct sockaddr_in*)sa)->sin_addr, 0, sizeof(((struct sockaddr_in*)sa)->sin_addr));
 239     p = (char *)&((struct sockaddr_in*)sa)->sin_addr;
 240     max_prefixlen = 32;
 241     break;
 242   case AF_INET6:
 243     memset(&((struct sockaddr_in6*)sa)->sin6_addr, 0, sizeof(((struct sockaddr_in6*)sa)->sin6_addr));
 244     p = (char *)&((struct sockaddr_in6*)sa)->sin6_addr;
 245 #if 0   /* XXX: fill scope-id? */
 246     if (IN6_IS_ADDR_LINKLOCAL(p) ||
 247         IN6_IS_ADDR_MC_LINKLOCAL(p)){
 248       ((struct sockaddr_in6*)sa)->sin6_scope_id = scopeid;
 249     }
 250 #endif
 251     max_prefixlen = 128;
 252     break;
 253   default:
 254     return NULL;
 255   }
 256   sa->sa_family = family;
 257 #ifdef HAVE_SOCKADDR_SA_LEN
 258   sa->sa_len = ifa_sa_len(family, len);
 259 #endif
 260   if (p){
 261     if (prefixlen > max_prefixlen)
 262       prefixlen = max_prefixlen;
 263     for (i=0; i<(prefixlen / 8); i++)
 264       *p++ = 0xff;
 265     c = 0xff;
 266     c <<= (8 - (prefixlen % 8));
 267     *p = c;
 268   }
 269   return sa;
 270 }
 271 #endif
 272
 273 /* ====================================================================== */
 274 static int
 275 nl_sendreq(int sd, int request, int flags, int *seq)
 276 {
 277   char reqbuf[NLMSG_ALIGN(sizeof(struct nlmsghdr)) +
 278               NLMSG_ALIGN(sizeof(struct rtgenmsg))];
 279   struct sockaddr_nl nladdr;
 280   struct nlmsghdr *req_hdr;
 281   struct rtgenmsg *req_msg;
 282   time_t t = time(NULL);
 283
 284   if (seq) *seq = t;
 285   memset(&reqbuf, 0, sizeof(reqbuf));
 286   req_hdr = (struct nlmsghdr *)reqbuf;
 287   req_msg = (struct rtgenmsg *)NLMSG_DATA(req_hdr);
 288   req_hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*req_msg));
 289   req_hdr->nlmsg_type = request;
 290   req_hdr->nlmsg_flags = flags | NLM_F_REQUEST;
 291   req_hdr->nlmsg_pid = 0;
 292   req_hdr->nlmsg_seq = t;
 293   req_msg->rtgen_family = AF_UNSPEC;
 294   memset(&nladdr, 0, sizeof(nladdr));
 295   nladdr.nl_family = AF_NETLINK;
 296   return (sendto(sd, (void *)req_hdr, req_hdr->nlmsg_len, 0,
 297                  (struct sockaddr *)&nladdr, sizeof(nladdr)));
 298 }
 299
 300 static int
 301 nl_recvmsg(int sd, int request, int seq,
 302            void *buf, size_t buflen,
 303            int *flags)
 304 {
 305   struct msghdr msg;
 306   struct iovec iov = { buf, buflen };
 307   struct sockaddr_nl nladdr;
 308   int read_len;
 309
 310   for (;;){
 311     msg.msg_name = (void *)&nladdr;
 312     msg.msg_namelen = sizeof(nladdr);
 313     msg.msg_iov = &iov;
 314     msg.msg_iovlen = 1;
 315     msg.msg_control = NULL;
 316     msg.msg_controllen = 0;
 317     msg.msg_flags = 0;
 318     read_len = recvmsg(sd, &msg, 0);
 319     if ((read_len < 0 && errno == EINTR) || (msg.msg_flags & MSG_TRUNC))
 320       continue;
 321     if (flags) *flags = msg.msg_flags;
 322     break;
 323   }
 324   return read_len;
 325 }
 326
 327 static int
 328 nl_getmsg(int sd, int request, int seq,
 329           struct nlmsghdr **nlhp,
 330           int *done)
 331 {
 332   struct nlmsghdr *nh;
 333   size_t bufsize = 65536, lastbufsize = 0;
 334   void *buff = NULL;
 335   int result = 0, read_size;
 336   int msg_flags;
 337   pid_t pid = getpid();
 338   for (;;){
 339     void *newbuff = realloc(buff, bufsize);
 340     if (newbuff == NULL || bufsize < lastbufsize) {
 341       result = -1;
 342       break;
 343     }
 344     buff = newbuff;
 345     result = read_size = nl_recvmsg(sd, request, seq, buff, bufsize, &msg_flags);
 346     if (read_size < 0 || (msg_flags & MSG_TRUNC)){
 347       lastbufsize = bufsize;
 348       bufsize *= 2;
 349       continue;
 350     }
 351     if (read_size == 0) break;
 352     nh = (struct nlmsghdr *)buff;
 353     for (nh = (struct nlmsghdr *)buff;
 354          NLMSG_OK(nh, read_size);
 355          nh = (struct nlmsghdr *)NLMSG_NEXT(nh, read_size)){
 356       if (nh->nlmsg_pid != pid ||
 357           nh->nlmsg_seq != seq)
 358         continue;
 359       if (nh->nlmsg_type == NLMSG_DONE){
 360         (*done)++;
 361         break; /* ok */
 362       }
 363       if (nh->nlmsg_type == NLMSG_ERROR){
 364         struct nlmsgerr *nlerr = (struct nlmsgerr *)NLMSG_DATA(nh);
 365         result = -1;
 366         if (nh->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
 367           __set_errno(EIO);
 368         else
 369           __set_errno(-nlerr->error);
 370         break;
 371       }
 372     }
 373     break;
 374   }
 375   if (result < 0)
 376     if (buff){
 377       int saved_errno = errno;
 378       free(buff);
 379       __set_errno(saved_errno);
 380     }
 381   *nlhp = (struct nlmsghdr *)buff;
 382   return result;
 383 }
 384
 385 static int
 386 nl_getlist(int sd, int seq,
 387            int request,
 388            struct nlmsg_list **nlm_list,
 389            struct nlmsg_list **nlm_end)
 390 {
 391   struct nlmsghdr *nlh = NULL;
 392   int status;
 393   int done = 0;
 394   int tries = 3;
 395
 396  try_again:
 397   status = nl_sendreq(sd, request, NLM_F_ROOT|NLM_F_MATCH, &seq);
 398   if (status < 0)
 399     return status;
 400   if (seq == 0)
 401     seq = (int)time(NULL);
 402   while(!done){
 403     struct pollfd pfd;
 404
 405     pfd.fd = sd;
 406     pfd.events = POLLIN | POLLPRI;
 407     pfd.revents = 0;
 408     status = poll(&pfd, 1, 1000);
 409     if (status < 0)
 410         return status;
 411     else if (status == 0) {
 412         seq++;
 413         if (tries-- > 0)
 414             goto try_again;
 415         return -1;
 416     }
 417
 418     status = nl_getmsg(sd, request, seq, &nlh, &done);
 419     if (status < 0)
 420       return status;
 421     if (nlh){
 422       struct nlmsg_list *nlm_next = (struct nlmsg_list *)malloc(sizeof(struct nlmsg_list));
 423       if (nlm_next == NULL){
 424         int saved_errno = errno;
 425         free(nlh);
 426         __set_errno(saved_errno);
 427         status = -1;
 428       } else {
 429         nlm_next->nlm_next = NULL;
 430         nlm_next->nlh = (struct nlmsghdr *)nlh;
 431         nlm_next->size = status;
 432         nlm_next->seq = seq;
 433         if (*nlm_list == NULL){
 434           *nlm_list = nlm_next;
 435           *nlm_end = nlm_next;
 436         } else {
 437           (*nlm_end)->nlm_next = nlm_next;
 438           *nlm_end = nlm_next;
 439         }
 440       }
 441     }
 442   }
 443   return status >= 0 ? seq : status;
 444 }
 445
 446 /* ---------------------------------------------------------------------- */
 447 static void
 448 free_nlmsglist(struct nlmsg_list *nlm0)
 449 {
 450   struct nlmsg_list *nlm, *nlm_next;
 451   int saved_errno;
 452   if (!nlm0)
 453     return;
 454   saved_errno = errno;
 455   for (nlm=nlm0; nlm; nlm=nlm_next){
 456     if (nlm->nlh)
 457       free(nlm->nlh);
 458     nlm_next=nlm->nlm_next;
 459     free(nlm);
 460   }
 461   __set_errno(saved_errno);
 462 }
 463
 464 static void
 465 free_data(void *data, void *ifdata)
 466 {
 467   int saved_errno = errno;
 468   if (data != NULL) free(data);
 469   if (ifdata != NULL) free(ifdata);
 470   __set_errno(saved_errno);
 471 }
 472
 473 /* ---------------------------------------------------------------------- */
 474 static void
 475 nl_close(int sd)
 476 {
 477   int saved_errno = errno;
 478   if (sd >= 0) __close(sd);
 479   __set_errno(saved_errno);
 480 }
 481
 482 /* ---------------------------------------------------------------------- */
 483 static int
 484 nl_open(void)
 485 {
 486   struct sockaddr_nl nladdr;
 487   int sd;
 488
 489   sd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 490   if (sd < 0) return -1;
 491   memset(&nladdr, 0, sizeof(nladdr));
 492   nladdr.nl_family = AF_NETLINK;
 493   if (bind(sd, (struct sockaddr*)&nladdr, sizeof(nladdr)) < 0){
 494     nl_close(sd);
 495     return -1;
 496   }
 497   return sd;
 498 }
 499
 500 /* ====================================================================== */
 501 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 502 rk_getifaddrs(struct ifaddrs **ifap)
 503 {
 504   int sd;
 505   struct nlmsg_list *nlmsg_list, *nlmsg_end, *nlm;
 506   /* - - - - - - - - - - - - - - - */
 507   int icnt;
 508   size_t dlen, xlen, nlen;
 509   uint32_t max_ifindex = 0;
 510
 511   pid_t pid = getpid();
 512   int seq;
 513   int result;
 514   int build     ; /* 0 or 1 */
 515
 516 /* ---------------------------------- */
 517   /* initialize */
 518   icnt = dlen = xlen = nlen = 0;
 519   nlmsg_list = nlmsg_end = NULL;
 520
 521   if (ifap)
 522     *ifap = NULL;
 523
 524 /* ---------------------------------- */
 525   /* open socket and bind */
 526   sd = nl_open();
 527   if (sd < 0)
 528     return -1;
 529
 530 /* ---------------------------------- */
 531    /* gather info */
 532   if ((seq = nl_getlist(sd, 0, RTM_GETLINK,
 533                         &nlmsg_list, &nlmsg_end)) < 0){
 534     free_nlmsglist(nlmsg_list);
 535     nl_close(sd);
 536     return -1;
 537   }
 538   if ((seq = nl_getlist(sd, seq+1, RTM_GETADDR,
 539                         &nlmsg_list, &nlmsg_end)) < 0){
 540     free_nlmsglist(nlmsg_list);
 541     nl_close(sd);
 542     return -1;
 543   }
 544
 545 /* ---------------------------------- */
 546   /* Estimate size of result buffer and fill it */
 547   for (build=0; build<=1; build++){
 548     struct ifaddrs *ifl = NULL, *ifa = NULL;
 549     struct nlmsghdr *nlh, *nlh0;
 550     char *data = NULL, *xdata = NULL;
 551     void *ifdata = NULL;
 552     char *ifname = NULL, **iflist = NULL;
 553     uint16_t *ifflist = NULL;
 554     struct rtmaddr_ifamap ifamap;
 555
 556     if (build){
 557       data = calloc(1,
 558                     NLMSG_ALIGN(sizeof(struct ifaddrs[icnt]))
 559                     + dlen + xlen + nlen);
 560       ifa = (struct ifaddrs *)data;
 561       ifdata = calloc(1,
 562                       NLMSG_ALIGN(sizeof(char *[max_ifindex+1]))
 563                       + NLMSG_ALIGN(sizeof(uint16_t [max_ifindex+1])));
 564       if (ifap != NULL)
 565         *ifap = (ifdata != NULL) ? ifa : NULL;
 566       else{
 567         free_data(data, ifdata);
 568         result = 0;
 569         break;
 570       }
 571       if (data == NULL || ifdata == NULL){
 572         free_data(data, ifdata);
 573         result = -1;
 574         break;
 575       }
 576       ifl = NULL;
 577       data += NLMSG_ALIGN(sizeof(struct ifaddrs)) * icnt;
 578       xdata = data + dlen;
 579       ifname = xdata + xlen;
 580       iflist = ifdata;
 581       ifflist = (uint16_t *)(((char *)iflist) + NLMSG_ALIGN(sizeof(char *[max_ifindex+1])));
 582     }
 583
 584     for (nlm=nlmsg_list; nlm; nlm=nlm->nlm_next){
 585       int nlmlen = nlm->size;
 586       if (!(nlh0 = nlm->nlh))
 587         continue;
 588       for (nlh = nlh0;
 589            NLMSG_OK(nlh, nlmlen);
 590            nlh=NLMSG_NEXT(nlh,nlmlen)){
 591         struct ifinfomsg *ifim = NULL;
 592         struct ifaddrmsg *ifam = NULL;
 593         struct rtattr *rta;
 594
 595         size_t nlm_struct_size = 0;
 596         sa_family_t nlm_family = 0;
 597         uint32_t nlm_scope = 0, nlm_index = 0;
 598         size_t sockaddr_size = 0;
 599         uint32_t nlm_prefixlen = 0;
 600         size_t rtasize;
 601
 602         memset(&ifamap, 0, sizeof(ifamap));
 603
 604         /* check if the message is what we want */
 605         if (nlh->nlmsg_pid != pid ||
 606             nlh->nlmsg_seq != nlm->seq)
 607           continue;
 608         if (nlh->nlmsg_type == NLMSG_DONE){
 609           break; /* ok */
 610         }
 611         switch (nlh->nlmsg_type){
 612         case RTM_NEWLINK:
 613           ifim = (struct ifinfomsg *)NLMSG_DATA(nlh);
 614           nlm_struct_size = sizeof(*ifim);
 615           nlm_family = ifim->ifi_family;
 616           nlm_scope = 0;
 617           nlm_index = ifim->ifi_index;
 618           nlm_prefixlen = 0;
 619           if (build)
 620             ifflist[nlm_index] = ifa->ifa_flags = ifim->ifi_flags;
 621           break;
 622         case RTM_NEWADDR:
 623           ifam = (struct ifaddrmsg *)NLMSG_DATA(nlh);
 624           nlm_struct_size = sizeof(*ifam);
 625           nlm_family = ifam->ifa_family;
 626           nlm_scope = ifam->ifa_scope;
 627           nlm_index = ifam->ifa_index;
 628           nlm_prefixlen = ifam->ifa_prefixlen;
 629           if (build)
 630             ifa->ifa_flags = ifflist[nlm_index];
 631           break;
 632         default:
 633           continue;
 634         }
 635
 636         if (!build){
 637           if (max_ifindex < nlm_index)
 638             max_ifindex = nlm_index;
 639         } else {
 640           if (ifl != NULL)
 641             ifl->ifa_next = ifa;
 642         }
 643
 644         rtasize = NLMSG_PAYLOAD(nlh, nlmlen) - NLMSG_ALIGN(nlm_struct_size);
 645         for (rta = (struct rtattr *)(((char *)NLMSG_DATA(nlh)) + NLMSG_ALIGN(nlm_struct_size));
 646              RTA_OK(rta, rtasize);
 647              rta = RTA_NEXT(rta, rtasize)){
 648           struct sockaddr **sap = NULL;
 649           void *rtadata = RTA_DATA(rta);
 650           size_t rtapayload = RTA_PAYLOAD(rta);
 651           socklen_t sa_len;
 652
 653           switch(nlh->nlmsg_type){
 654           case RTM_NEWLINK:
 655             switch(rta->rta_type){
 656             case IFLA_ADDRESS:
 657             case IFLA_BROADCAST:
 658               if (build){
 659                 sap = (rta->rta_type == IFLA_ADDRESS) ? &ifa->ifa_addr : &ifa->ifa_broadaddr;
 660                 *sap = (struct sockaddr *)data;
 661               }
 662               sa_len = ifa_sa_len(AF_PACKET, rtapayload);
 663               if (rta->rta_type == IFLA_ADDRESS)
 664                 sockaddr_size = NLMSG_ALIGN(sa_len);
 665               if (!build){
 666                 dlen += NLMSG_ALIGN(sa_len);
 667               } else {
 668                 memset(*sap, 0, sa_len);
 669                 ifa_make_sockaddr(AF_PACKET, *sap, rtadata,rtapayload, 0,0);
 670                 ((struct sockaddr_ll *)*sap)->sll_ifindex = nlm_index;
 671                 ((struct sockaddr_ll *)*sap)->sll_hatype = ifim->ifi_type;
 672                 data += NLMSG_ALIGN(sa_len);
 673               }
 674               break;
 675             case IFLA_IFNAME:/* Name of Interface */
 676               if (!build)
 677                 nlen += NLMSG_ALIGN(rtapayload + 1);
 678               else{
 679                 ifa->ifa_name = ifname;
 680                 if (iflist[nlm_index] == NULL)
 681                   iflist[nlm_index] = ifa->ifa_name;
 682                 strncpy(ifa->ifa_name, rtadata, rtapayload);
 683                 ifa->ifa_name[rtapayload] = '\0';
 684                 ifname += NLMSG_ALIGN(rtapayload + 1);
 685               }
 686               break;
 687             case IFLA_STATS:/* Statistics of Interface */
 688               if (!build)
 689                 xlen += NLMSG_ALIGN(rtapayload);
 690               else{
 691                 ifa->ifa_data = xdata;
 692                 memcpy(ifa->ifa_data, rtadata, rtapayload);
 693                 xdata += NLMSG_ALIGN(rtapayload);
 694               }
 695               break;
 696             case IFLA_UNSPEC:
 697               break;
 698             case IFLA_MTU:
 699               break;
 700             case IFLA_LINK:
 701               break;
 702             case IFLA_QDISC:
 703               break;
 704             default:
 705               break;
 706             }
 707             break;
 708           case RTM_NEWADDR:
 709             if (nlm_family == AF_PACKET) break;
 710             switch(rta->rta_type){
 711             case IFA_ADDRESS:
 712                 ifamap.address = rtadata;
 713                 ifamap.address_len = rtapayload;
 714                 break;
 715             case IFA_LOCAL:
 716                 ifamap.local = rtadata;
 717                 ifamap.local_len = rtapayload;
 718                 break;
 719             case IFA_BROADCAST:
 720                 ifamap.broadcast = rtadata;
 721                 ifamap.broadcast_len = rtapayload;
 722                 break;
 723 #ifdef HAVE_IFADDRS_IFA_ANYCAST
 724             case IFA_ANYCAST:
 725                 ifamap.anycast = rtadata;
 726                 ifamap.anycast_len = rtapayload;
 727                 break;
 728 #endif
 729             case IFA_LABEL:
 730               if (!build)
 731                 nlen += NLMSG_ALIGN(rtapayload + 1);
 732               else{
 733                 ifa->ifa_name = ifname;
 734                 if (iflist[nlm_index] == NULL)
 735                   iflist[nlm_index] = ifname;
 736                 strncpy(ifa->ifa_name, rtadata, rtapayload);
 737                 ifa->ifa_name[rtapayload] = '\0';
 738                 ifname += NLMSG_ALIGN(rtapayload + 1);
 739               }
 740               break;
 741             case IFA_UNSPEC:
 742               break;
 743             case IFA_CACHEINFO:
 744               break;
 745             default:
 746               break;
 747             }
 748           }
 749         }
 750         if (nlh->nlmsg_type == RTM_NEWADDR &&
 751             nlm_family != AF_PACKET) {
 752           if (!ifamap.local) {
 753             ifamap.local = ifamap.address;
 754             ifamap.local_len = ifamap.address_len;
 755           }
 756           if (!ifamap.address) {
 757             ifamap.address = ifamap.local;
 758             ifamap.address_len = ifamap.local_len;
 759           }
 760           if (ifamap.address_len != ifamap.local_len ||
 761               (ifamap.address != NULL &&
 762                memcmp(ifamap.address, ifamap.local, ifamap.address_len))) {
 763             /* p2p; address is peer and local is ours */
 764             ifamap.broadcast = ifamap.address;
 765             ifamap.broadcast_len = ifamap.address_len;
 766             ifamap.address = ifamap.local;
 767             ifamap.address_len = ifamap.local_len;
 768           }
 769           if (ifamap.address) {
 770 #ifndef IFA_NETMASK
 771             sockaddr_size = NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.address_len));
 772 #endif
 773             if (!build)
 774               dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.address_len));
 775             else {
 776               ifa->ifa_addr = (struct sockaddr *)data;
 777               ifa_make_sockaddr(nlm_family, ifa->ifa_addr, ifamap.address, ifamap.address_len,
 778                                 nlm_scope, nlm_index);
 779               data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.address_len));
 780             }
 781           }
 782 #ifdef IFA_NETMASK
 783           if (ifamap.netmask) {
 784             if (!build)
 785               dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.netmask_len));
 786             else {
 787               ifa->ifa_netmask = (struct sockaddr *)data;
 788               ifa_make_sockaddr(nlm_family, ifa->ifa_netmask, ifamap.netmask, ifamap.netmask_len,
 789                                 nlm_scope, nlm_index);
 790               data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.netmask_len));
 791             }
 792           }
 793 #endif
 794           if (ifamap.broadcast) {
 795             if (!build)
 796               dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.broadcast_len));
 797             else {
 798               ifa->ifa_broadaddr = (struct sockaddr *)data;
 799               ifa_make_sockaddr(nlm_family, ifa->ifa_broadaddr, ifamap.broadcast, ifamap.broadcast_len,
 800                                 nlm_scope, nlm_index);
 801               data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.broadcast_len));
 802             }
 803           }
 804 #ifdef HAVE_IFADDRS_IFA_ANYCAST
 805           if (ifamap.anycast) {
 806             if (!build)
 807               dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.anycast_len));
 808             else {
 809               ifa->ifa_anycast = (struct sockaddr *)data;
 810               ifa_make_sockaddr(nlm_family, ifa->ifa_anyaddr, ifamap.anycast, ifamap.anycast_len,
 811                                 nlm_scope, nlm_index);
 812               data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.anycast_len));
 813             }
 814           }
 815 #endif
 816         }
 817         if (!build){
 818 #ifndef IFA_NETMASK
 819           dlen += sockaddr_size;
 820 #endif
 821           icnt++;
 822         } else {
 823           if (ifa->ifa_name == NULL)
 824             ifa->ifa_name = iflist[nlm_index];
 825 #ifndef IFA_NETMASK
 826           if (ifa->ifa_addr &&
 827               ifa->ifa_addr->sa_family != AF_UNSPEC &&
 828               ifa->ifa_addr->sa_family != AF_PACKET){
 829             ifa->ifa_netmask = (struct sockaddr *)data;
 830             ifa_make_sockaddr_mask(ifa->ifa_addr->sa_family, ifa->ifa_netmask, nlm_prefixlen);
 831           }
 832           data += sockaddr_size;
 833 #endif
 834           ifl = ifa++;
 835         }
 836       }
 837     }
 838     if (!build){
 839       if (icnt == 0 && (dlen + nlen + xlen == 0)){
 840         if (ifap != NULL)
 841           *ifap = NULL;
 842         break; /* cannot found any addresses */
 843       }
 844     }
 845     else
 846       free_data(NULL, ifdata);
 847   }
 848
 849 /* ---------------------------------- */
 850   /* Finalize */
 851   free_nlmsglist(nlmsg_list);
 852   nl_close(sd);
 853   return 0;
 854 }
 855
 856 void ROKEN_LIB_FUNCTION
 857 rk_freeifaddrs(struct ifaddrs *ifp)
 858 {
 859     /* AF_NETLINK method uses a single allocation for all interfaces */
 860     free(ifp);
 861 }
 862
 863 #else /* !AF_NETLINK */
 864
 865 /*
 866  * The generic SIOCGIFCONF version.
 867  */
 868
 869 static int
 870 getifaddrs2(struct ifaddrs **ifap,
 871             int af, int siocgifconf, int siocgifflags,
 872             size_t ifreq_sz)
 873 {
 874     int ret;
 875     int fd;
 876     size_t buf_size;
 877     char *buf;
 878     struct ifconf ifconf;
 879     char *p;
 880     size_t sz;
 881     struct sockaddr sa_zero;
 882     struct ifreq *ifr;
 883     struct ifaddrs *start = NULL, **end = &start;
 884
 885     buf = NULL;
 886
 887     memset (&sa_zero, 0, sizeof(sa_zero));
 888     fd = socket(af, SOCK_DGRAM, 0);
 889     if (fd < 0)
 890         return -1;
 891
 892     buf_size = 8192;
 893     for (;;) {
 894         buf = calloc(1, buf_size);
 895         if (buf == NULL) {
 896             ret = ENOMEM;
 897             goto error_out;
 898         }
 899         ifconf.ifc_len = buf_size;
 900         ifconf.ifc_buf = buf;
 901
 902         /*
 903          * Solaris returns EINVAL when the buffer is too small.
 904          */
 905         if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) {
 906             ret = errno;
 907             goto error_out;
 908         }
 909         /*
 910          * Can the difference between a full and a overfull buf
 911          * be determined?
 912          */
 913
 914         if (ifconf.ifc_len < buf_size)
 915             break;
 916         free (buf);
 917         buf_size *= 2;
 918     }
 919
 920     for (p = ifconf.ifc_buf;
 921          p < ifconf.ifc_buf + ifconf.ifc_len;
 922          p += sz) {
 923         struct ifreq ifreq;
 924         struct sockaddr *sa;
 925         size_t salen;
 926
 927         ifr = (struct ifreq *)p;
 928         sa  = &ifr->ifr_addr;
 929
 930         sz = ifreq_sz;
 931         salen = sizeof(struct sockaddr);
 932 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
 933         salen = sa->sa_len;
 934         sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
 935 #endif
 936 #ifdef SA_LEN
 937         salen = SA_LEN(sa);
 938         sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa));
 939 #endif
 940         memset (&ifreq, 0, sizeof(ifreq));
 941         memcpy (ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
 942
 943         if (ioctl(fd, siocgifflags, &ifreq) < 0) {
 944             ret = errno;
 945             goto error_out;
 946         }
 947
 948         *end = malloc(sizeof(**end));
 949         if (*end == NULL) {
 950             ret = ENOMEM;
 951             goto error_out;
 952         }
 953
 954         (*end)->ifa_next = NULL;
 955         (*end)->ifa_name = strdup(ifr->ifr_name);
 956         if ((*end)->ifa_name == NULL) {
 957             ret = ENOMEM;
 958             goto error_out;
 959         }
 960         (*end)->ifa_flags = ifreq.ifr_flags;
 961         (*end)->ifa_addr = malloc(salen);
 962         if ((*end)->ifa_addr == NULL) {
 963             ret = ENOMEM;
 964             goto error_out;
 965         }
 966         memcpy((*end)->ifa_addr, sa, salen);
 967         (*end)->ifa_netmask = NULL;
 968
 969 #if 0
 970         /* fix these when we actually need them */
 971         if(ifreq.ifr_flags & IFF_BROADCAST) {
 972             (*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr));
 973             if ((*end)->ifa_broadaddr == NULL) {
 974                 ret = ENOMEM;
 975                 goto error_out;
 976             }
 977             memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr,
 978                    sizeof(ifr->ifr_broadaddr));
 979         } else if(ifreq.ifr_flags & IFF_POINTOPOINT) {
 980             (*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr));
 981             if ((*end)->ifa_dstaddr == NULL) {
 982                 ret = ENOMEM;
 983                 goto error_out;
 984             }
 985             memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr,
 986                    sizeof(ifr->ifr_dstaddr));
 987         } else
 988             (*end)->ifa_dstaddr = NULL;
 989 #else
 990             (*end)->ifa_dstaddr = NULL;
 991 #endif
 992
 993         (*end)->ifa_data = NULL;
 994
 995         end = &(*end)->ifa_next;
 996
 997     }
 998     *ifap = start;
 999     close(fd);
1000     free(buf);
1001     return 0;
1002   error_out:
1003     rk_freeifaddrs(start);
1004     close(fd);
1005     free(buf);
1006     errno = ret;
1007     return -1;
1008 }
1009
1010 #if defined(HAVE_IPV6) && defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS)
1011 static int
1012 getlifaddrs2(struct ifaddrs **ifap,
1013              int af, int siocgifconf, int siocgifflags,
1014              size_t ifreq_sz)
1015 {
1016     int ret;
1017     int fd;
1018     size_t buf_size;
1019     char *buf;
1020     struct lifconf ifconf;
1021     char *p;
1022     size_t sz;
1023     struct sockaddr sa_zero;
1024     struct lifreq *ifr;
1025     struct ifaddrs *start = NULL, **end = &start;
1026
1027     buf = NULL;
1028
1029     memset (&sa_zero, 0, sizeof(sa_zero));
1030     fd = socket(af, SOCK_DGRAM, 0);
1031     if (fd < 0)
1032         return -1;
1033
1034     buf_size = 8192;
1035     for (;;) {
1036         buf = calloc(1, buf_size);
1037         if (buf == NULL) {
1038             ret = ENOMEM;
1039             goto error_out;
1040         }
1041 #ifndef __hpux
1042         ifconf.lifc_family = af;
1043         ifconf.lifc_flags  = 0;
1044 #endif
1045         ifconf.lifc_len    = buf_size;
1046         ifconf.lifc_buf    = buf;
1047
1048         /*
1049          * Solaris returns EINVAL when the buffer is too small.
1050          */
1051         if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) {
1052             ret = errno;
1053             goto error_out;
1054         }
1055         /*
1056          * Can the difference between a full and a overfull buf
1057          * be determined?
1058          */
1059
1060         if (ifconf.lifc_len < buf_size)
1061             break;
1062         free (buf);
1063         buf_size *= 2;
1064     }
1065
1066     for (p = ifconf.lifc_buf;
1067          p < ifconf.lifc_buf + ifconf.lifc_len;
1068          p += sz) {
1069         struct lifreq ifreq;
1070         struct sockaddr_storage *sa;
1071         size_t salen;
1072
1073         ifr = (struct lifreq *)p;
1074         sa  = &ifr->lifr_addr;
1075
1076         sz = ifreq_sz;
1077         salen = sizeof(struct sockaddr_storage);
1078 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1079         salen = sa->sa_len;
1080         sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
1081 #endif
1082 #ifdef SA_LEN
1083         salen = SA_LEN(sa);
1084         sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa));
1085 #endif
1086         memset (&ifreq, 0, sizeof(ifreq));
1087         memcpy (ifreq.lifr_name, ifr->lifr_name, sizeof(ifr->lifr_name));
1088
1089         if (ioctl(fd, siocgifflags, &ifreq) < 0) {
1090             ret = errno;
1091             goto error_out;
1092         }
1093
1094         *end = malloc(sizeof(**end));
1095         if (*end == NULL) {
1096             ret = ENOMEM;
1097             goto error_out;
1098         }
1099
1100         (*end)->ifa_next = NULL;
1101         (*end)->ifa_name = strdup(ifr->lifr_name);
1102         if ((*end)->ifa_name == NULL) {
1103             ret = ENOMEM;
1104             goto error_out;
1105         }
1106         (*end)->ifa_flags = ifreq.lifr_flags;
1107         (*end)->ifa_addr = malloc(salen);
1108         if ((*end)->ifa_addr == NULL) {
1109             ret = ENOMEM;
1110             goto error_out;
1111         }
1112         memcpy((*end)->ifa_addr, sa, salen);
1113         (*end)->ifa_netmask = NULL;
1114
1115 #if 0
1116         /* fix these when we actually need them */
1117         if(ifreq.ifr_flags & IFF_BROADCAST) {
1118             (*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr));
1119             if ((*end)->ifa_broadaddr == NULL) {
1120                 ret = ENOMEM;
1121                 goto error_out;
1122             }
1123             memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr,
1124                    sizeof(ifr->ifr_broadaddr));
1125         } else if(ifreq.ifr_flags & IFF_POINTOPOINT) {
1126             (*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr));
1127             if ((*end)->ifa_dstaddr == NULL) {
1128                 ret = ENOMEM;
1129                 goto error_out;
1130             }
1131             memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr,
1132                    sizeof(ifr->ifr_dstaddr));
1133         } else
1134             (*end)->ifa_dstaddr = NULL;
1135 #else
1136             (*end)->ifa_dstaddr = NULL;
1137 #endif
1138
1139         (*end)->ifa_data = NULL;
1140
1141         end = &(*end)->ifa_next;
1142
1143     }
1144     *ifap = start;
1145     close(fd);
1146     free(buf);
1147     return 0;
1148   error_out:
1149     rk_freeifaddrs(start);
1150     close(fd);
1151     free(buf);
1152     errno = ret;
1153     return -1;
1154 }
1155 #endif /* defined(HAVE_IPV6) && defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS) */
1156
1157 /**
1158  * Join two struct ifaddrs lists by appending supp to base.
1159  * Either may be NULL. The new list head (usually base) will be
1160  * returned.
1161  */
1162 static struct ifaddrs *
1163 append_ifaddrs(struct ifaddrs *base, struct ifaddrs *supp) {
1164     if (!base)
1165         return supp;
1166
1167     if (!supp)
1168         return base;
1169
1170     while (base->ifa_next)
1171         base = base->ifa_next;
1172
1173     base->ifa_next = supp;
1174
1175     return base;
1176 }
1177
1178 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
1179 rk_getifaddrs(struct ifaddrs **ifap)
1180 {
1181     int ret = -1;
1182     errno = ENXIO;
1183 #if defined(AF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS)
1184     if (ret)
1185         ret = getifaddrs2 (ifap, AF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS,
1186                            sizeof(struct in6_ifreq));
1187 #endif
1188 #if defined(HAVE_IPV6) && defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS)
1189     /* Do IPv6 and IPv4 queries separately then join the result.
1190      *
1191      * HP-UX only returns IPv6 addresses using SIOCGLIFCONF,
1192      * SIOCGIFCONF has to be used for IPv4 addresses. The result is then
1193      * merged.
1194      *
1195      * Solaris needs particular care, because a SIOCGLIFCONF lookup using
1196      * AF_UNSPEC can fail in a Zone requiring an AF_INET lookup, so we just
1197      * do them separately the same as for HP-UX. See
1198      * http://repo.or.cz/w/heimdal.git/commitdiff/76afc31e9ba2f37e64c70adc006ade9e37e9ef73
1199      */
1200     if (ret) {
1201         int v6err, v4err;
1202         struct ifaddrs *v6addrs, *v4addrs;
1203
1204         v6err = getlifaddrs2 (&v6addrs, AF_INET6, SIOCGLIFCONF, SIOCGLIFFLAGS,
1205                             sizeof(struct lifreq));
1206         v4err = getifaddrs2 (&v4addrs, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
1207                             sizeof(struct ifreq));
1208         if (v6err)
1209             v6addrs = NULL;
1210         if (v4err)
1211             v4addrs = NULL;
1212
1213         if (v6addrs) {
1214             if (v4addrs)
1215                 *ifap = append_ifaddrs(v6addrs, v4addrs);
1216             else
1217                 *ifap = v6addrs;
1218         } else if (v4addrs) {
1219             *ifap = v4addrs;
1220         } else {
1221             *ifap = NULL;
1222         }
1223
1224         ret = (v6err || v4err) ? -1 : 0;
1225     }
1226 #endif
1227 #if defined(HAVE_IPV6) && defined(SIOCGIFCONF)
1228     if (ret)
1229         ret = getifaddrs2 (ifap, AF_INET6, SIOCGIFCONF, SIOCGIFFLAGS,
1230                            sizeof(struct ifreq));
1231 #endif
1232 #if defined(AF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS)
1233     if (ret)
1234         ret = getifaddrs2 (ifap, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
1235                            sizeof(struct ifreq));
1236 #endif
1237     return ret;
1238 }
1239
1240 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
1241 rk_freeifaddrs(struct ifaddrs *ifp)
1242 {
1243     struct ifaddrs *p, *q;
1244
1245     for(p = ifp; p; ) {
1246         free(p->ifa_name);
1247         if(p->ifa_addr)
1248             free(p->ifa_addr);
1249         if(p->ifa_dstaddr)
1250             free(p->ifa_dstaddr);
1251         if(p->ifa_netmask)
1252             free(p->ifa_netmask);
1253         if(p->ifa_data)
1254             free(p->ifa_data);
1255         q = p;
1256         p = p->ifa_next;
1257         free(q);
1258     }
1259 }
1260
1261 #endif /* !AF_NETLINK */
1262
1263 #ifdef TEST
1264
1265 void
1266 print_addr(const char *s, struct sockaddr *sa)
1267 {
1268     int i;
1269     printf("  %s=%d/", s, sa->sa_family);
1270 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1271     for(i = 0; i < sa->sa_len - ((long)sa->sa_data - (long)&sa->sa_family); i++)
1272         printf("%02x", ((unsigned char*)sa->sa_data)[i]);
1273 #else
1274     for(i = 0; i < sizeof(sa->sa_data); i++)
1275         printf("%02x", ((unsigned char*)sa->sa_data)[i]);
1276 #endif
1277     printf("\n");
1278 }
1279
1280 void
1281 print_ifaddrs(struct ifaddrs *x)
1282 {
1283     struct ifaddrs *p;
1284
1285     for(p = x; p; p = p->ifa_next) {
1286         printf("%s\n", p->ifa_name);
1287         printf("  flags=%x\n", p->ifa_flags);
1288         if(p->ifa_addr)
1289             print_addr("addr", p->ifa_addr);
1290         if(p->ifa_dstaddr)
1291             print_addr("dstaddr", p->ifa_dstaddr);
1292         if(p->ifa_netmask)
1293             print_addr("netmask", p->ifa_netmask);
1294         printf("  %p\n", p->ifa_data);
1295     }
1296 }
1297
1298 int
1299 main()
1300 {
1301     struct ifaddrs *a = NULL, *b;
1302     getifaddrs2(&a, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, sizeof(struct ifreq));
1303     print_ifaddrs(a);
1304     printf("---\n");
1305     getifaddrs(&b);
1306     print_ifaddrs(b);
1307     return 0;
1308 }
1309 #endif