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Sourcecode: dante version File versions

getifaddrs.c

/* $Id: getifaddrs.c,v 1.2 2001/12/12 12:31:57 karls Exp $ */

#ifdef HAVE_CONFIG_H
#include "autoconf.h"
#endif  /* HAVE_CONFIG_H */

#include "common.h"

#if !HAVE_GETIFADDRS
/*    $OpenBSD: getifaddrs.c,v 1.3 2000/11/24 08:26:47 itojun Exp $     */

/*
 * Copyright (c) 1995, 1999
 *    Berkeley Software Design, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *    BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
 */
/*
 * NOTE: SIOCGIFCONF case is not LP64 friendly.  it also does not perform
 * try-and-error for region size.
 */
#if 0
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#endif
#ifdef      NET_RT_IFLIST
#include <sys/param.h>
#include <net/route.h>
#include <sys/sysctl.h>
#include <net/if_dl.h>
#endif

#if 0
#include <errno.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>
#endif


/*XXX IPv6*/
#if !HAVE_SOCKADDR_SA_LEN && !defined(SA_LEN)
#define     SA_LEN(sa)  sizeof(struct sockaddr)
#endif

#if !defined(SA_LEN)
#define     SA_LEN(sa)  (sa)->sa_len
#endif

#if HAVE_SOCKADDR_SA_LEN
#define     SALIGN      (sizeof(long) - 1)
#define     SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
#else
#define SA_RLEN(sa) (SA_LEN(sa)) /*XXX?*/
#endif /* HAVE_SOCKADDR_SA_LEN */

#ifndef     ALIGNBYTES
/*
 * On systems with a routing socket, ALIGNBYTES should match the value
 * that the kernel uses when building the messages.
 */
#define     ALIGNBYTES  XXX
#endif
#ifndef     ALIGN
#define     ALIGN(p)    (((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)
#endif

#ifdef _BSDI_VERSION
#if   _BSDI_VERSION >= 199701
#define     HAVE_IFM_DATA
#endif

#if   _BSDI_VERSION >= 199802
/* ifam_data is very specific to recent versions of bsdi */
#define     HAVE_IFAM_DATA
#endif
#endif /* _BSDI_VERSION */

#if 0
#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
#define     HAVE_IFM_DATA
#endif
#endif

/*XXX*/
#undef NET_RT_IFLIST
#undef HAVE_IFM_DATA

int
getifaddrs(struct ifaddrs **pif)
{
      int icnt = 1;
      int dcnt = 0;
      int ncnt = 0;
#ifdef      NET_RT_IFLIST
      int mib[6];
      size_t needed;
      char *buf;
      char *next;
      struct ifaddrs *cif = 0;
      char *p, *p0;
      struct rt_msghdr *rtm;
      struct if_msghdr *ifm;
      struct ifa_msghdr *ifam;
      struct sockaddr_dl *dl;
      struct sockaddr *sa;
      u_short index = 0;
      size_t len, alen;
#else /* NET_RT_IFLIST */
      char buf[1024];
      int sock;
      struct ifconf ifc;
      struct ifreq *ifr;
      struct ifreq *lifr;
#endif      /* NET_RT_IFLIST */
      struct ifaddrs *ifa, *ift;
      int i;
      char *data;
      char *names;

#ifdef      NET_RT_IFLIST
      mib[0] = CTL_NET;
      mib[1] = PF_ROUTE;
      mib[2] = 0;             /* protocol */
      mib[3] = 0;             /* wildcard address family */
      mib[4] = NET_RT_IFLIST;
      mib[5] = 0;             /* no flags */
      if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
            return (-1);
      if ((buf = malloc(needed)) == NULL)
            return (-1);
      if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
            free(buf);
            return (-1);
      }

      for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
            rtm = (struct rt_msghdr *)next;
            if (rtm->rtm_version != RTM_VERSION)
                  continue;
            switch (rtm->rtm_type) {
            case RTM_IFINFO:
                  ifm = (struct if_msghdr *)rtm;
                  if (ifm->ifm_addrs & RTA_IFP) {
                        index = ifm->ifm_index;
                        ++icnt;
                        dl = (struct sockaddr_dl *)(ifm + 1);
                        dcnt += SA_RLEN((struct sockaddr *)dl) +
                              ALIGNBYTES;
#ifdef      HAVE_IFM_DATA
                        dcnt += sizeof(ifm->ifm_data);
#endif      /* HAVE_IFM_DATA */
                        ncnt += dl->sdl_nlen + 1;
                  } else
                        index = 0;
                  break;

            case RTM_NEWADDR:
                  ifam = (struct ifa_msghdr *)rtm;
                  if (index && ifam->ifam_index != index)
                        abort();    /* this cannot happen */

#define     RTA_MASKS   (RTA_NETMASK | RTA_IFA | RTA_BRD)
                  if (index == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
                        break;
                  p = (char *)(ifam + 1);
                  ++icnt;
#ifdef      HAVE_IFAM_DATA
                  dcnt += sizeof(ifam->ifam_data) + ALIGNBYTES;
#endif      /* HAVE_IFAM_DATA */
                  /* Scan to look for length of address */
                  alen = 0;
                  for (p0 = p, i = 0; i < RTAX_MAX; i++) {
                        if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
                            == 0)
                              continue;
                        sa = (struct sockaddr *)p;
                        len = SA_RLEN(sa);
                        if (i == RTAX_IFA) {
                              alen = len;
                              break;
                        }
                        p += len;
                  }
                  for (p = p0, i = 0; i < RTAX_MAX; i++) {
                        if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
                            == 0)
                              continue;
                        sa = (struct sockaddr *)p;
                        len = SA_RLEN(sa);
                        if (i == RTAX_NETMASK && SA_LEN(sa) == 0)
                              dcnt += alen;
                        else
                              dcnt += len;
                        p += len;
                  }
                  break;
            }
      }
#else /* NET_RT_IFLIST */
      ifc.ifc_buf = buf;
      ifc.ifc_len = sizeof(buf);

      if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
            return (-1);
      i = ioctl(sock, SIOCGIFCONF, (char *)&ifc);
      close(sock);
      if (i == -1)
            return (-1);

      ifr = ifc.ifc_req;
      lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];

      while (ifr < lifr) {
            struct sockaddr *sa;

            sa = &ifr->ifr_addr;
            ++icnt;
            dcnt += SA_RLEN(sa);
            ncnt += sizeof(ifr->ifr_name) + 1;

            ifr = (struct ifreq *)(((char *)sa) + SA_LEN(sa));
      }
#endif      /* NET_RT_IFLIST */

      if (icnt + dcnt + ncnt == 1) {
            *pif = NULL;
            free(buf);
            return (0);
      }
      data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
      if (data == NULL) {
            free(buf);
            return(-1);
      }

      ifa = (struct ifaddrs *)data;
      data += sizeof(struct ifaddrs) * icnt;
      names = data + dcnt;

      memset(ifa, 0, sizeof(struct ifaddrs) * icnt);
      ift = ifa;

#ifdef      NET_RT_IFLIST
      index = 0;
      for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
            rtm = (struct rt_msghdr *)next;
            if (rtm->rtm_version != RTM_VERSION)
                  continue;
            switch (rtm->rtm_type) {
            case RTM_IFINFO:
                  ifm = (struct if_msghdr *)rtm;
                  if (ifm->ifm_addrs & RTA_IFP) {
                        index = ifm->ifm_index;
                        dl = (struct sockaddr_dl *)(ifm + 1);

                        cif = ift;
                        ift->ifa_name = names;
                        ift->ifa_flags = (int)ifm->ifm_flags;
                        memcpy(names, dl->sdl_data, dl->sdl_nlen);
                        names[dl->sdl_nlen] = 0;
                        names += dl->sdl_nlen + 1;

                        ift->ifa_addr = (struct sockaddr *)data;
                        memcpy(data, dl, SA_LEN((struct sockaddr *)dl));
                        data += SA_RLEN((struct sockaddr *)dl);

#ifdef      HAVE_IFM_DATA
                        /* ifm_data needs to be aligned */
                        ift->ifa_data = data = (void *)ALIGN(data);
                        memcpy(data, &ifm->ifm_data, sizeof(ifm->ifm_data));
                        data += sizeof(ifm->ifm_data);
#else /* HAVE_IFM_DATA */
                        ift->ifa_data = NULL;
#endif      /* HAVE_IFM_DATA */

                        ift = (ift->ifa_next = ift + 1);
                  } else
                        index = 0;
                  break;

            case RTM_NEWADDR:
                  ifam = (struct ifa_msghdr *)rtm;
                  if (index && ifam->ifam_index != index)
                        abort();    /* this cannot happen */

                  if (index == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
                        break;
                  ift->ifa_name = cif->ifa_name;
                  ift->ifa_flags = cif->ifa_flags;
                  ift->ifa_data = NULL;
                  p = (char *)(ifam + 1);
                  /* Scan to look for length of address */
                  alen = 0;
                  for (p0 = p, i = 0; i < RTAX_MAX; i++) {
                        if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
                            == 0)
                              continue;
                        sa = (struct sockaddr *)p;
                        len = SA_RLEN(sa);
                        if (i == RTAX_IFA) {
                              alen = len;
                              break;
                        }
                        p += len;
                  }
                  for (p = p0, i = 0; i < RTAX_MAX; i++) {
                        if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
                            == 0)
                              continue;
                        sa = (struct sockaddr *)p;
                        len = SA_RLEN(sa);
                        switch (i) {
                        case RTAX_IFA:
                              ift->ifa_addr = (struct sockaddr *)data;
                              memcpy(data, p, len);
                              data += len;
                              break;

                        case RTAX_NETMASK:
                              ift->ifa_netmask =
                                  (struct sockaddr *)data;
                              if (SA_LEN(sa) == 0) {
                                    memset(data, 0, alen);
                                    data += alen;
                                    break;
                              }
                              memcpy(data, p, len);
                              data += len;
                              break;

                        case RTAX_BRD:
                              ift->ifa_broadaddr =
                                  (struct sockaddr *)data;
                              memcpy(data, p, len);
                              data += len;
                              break;
                        }
                        p += len;
                  }

#ifdef      HAVE_IFAM_DATA
                  /* ifam_data needs to be aligned */
                  ift->ifa_data = data = (void *)ALIGN(data);
                  memcpy(data, &ifam->ifam_data, sizeof(ifam->ifam_data));
                  data += sizeof(ifam->ifam_data);
#endif      /* HAVE_IFAM_DATA */

                  ift = (ift->ifa_next = ift + 1);
                  break;
            }
      }

      free(buf);
#else /* NET_RT_IFLIST */
      ifr = ifc.ifc_req;
      lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];

      while (ifr < lifr) {
            struct sockaddr *sa;

            ift->ifa_name = names;
            names[sizeof(ifr->ifr_name)] = 0;
            strncpy(names, ifr->ifr_name, sizeof(ifr->ifr_name));
            while (*names++)
                  ;

            ift->ifa_addr = (struct sockaddr *)data;
            sa = &ifr->ifr_addr;
            memcpy(data, sa, SA_LEN(sa));
            data += SA_RLEN(sa);

            ifr = (struct ifreq *)(((char *)sa) + SA_LEN(sa));
            ift = (ift->ifa_next = ift + 1);
      }
#endif      /* NET_RT_IFLIST */
      if (--ift >= ifa) {
            ift->ifa_next = NULL;
            *pif = ifa;
      } else {
            *pif = NULL;
            free(ifa);
      }
      return (0);
}
void
freeifaddrs(struct ifaddrs *ifp)
{
      free(ifp);
}
#else
static void avoid_error __P((void));
static void avoid_error()
{
      avoid_error();
}
#endif  /* !HAVE_DAEMON */

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