349 lines
8.6 KiB
C
349 lines
8.6 KiB
C
/* $KAME: getifaddrs.c,v 1.9 2001/08/20 02:31:20 itojun Exp $ */
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/*
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* Copyright (c) 1995, 1999
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* Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
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*/
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/*
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* NOTE: SIOCGIFCONF case is not LP64 friendly. it also does not perform
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* try-and-error for region size.
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*/
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#include <sys/cdefs.h>
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#ifndef FSTACK
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#endif
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#ifdef NET_RT_IFLIST
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#include <sys/param.h>
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#include <net/route.h>
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#include <sys/sysctl.h>
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#include <net/if_dl.h>
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#endif
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#include <errno.h>
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#include <ifaddrs.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef FSTACK
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#include "un-namespace.h"
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#endif
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#if !defined(AF_LINK)
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#define SA_LEN(sa) sizeof(struct sockaddr)
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#endif
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#if !defined(SA_LEN)
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#define SA_LEN(sa) (sa)->sa_len
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#endif
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#define SALIGN (sizeof(long) - 1)
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#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
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#ifndef ALIGNBYTES
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/*
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* On systems with a routing socket, ALIGNBYTES should match the value
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* that the kernel uses when building the messages.
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*/
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#define ALIGNBYTES (sizeof(long long) - 1)
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#endif
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#ifndef ALIGN
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#define ALIGN(p) (((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)
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#endif
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#define MAX_SYSCTL_TRY 5
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int
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getifaddrs(struct ifaddrs **pif)
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{
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int icnt = 1;
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int dcnt = 0;
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int ncnt = 0;
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int ntry = 0;
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int mib[6];
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size_t needed;
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char *buf;
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char *next;
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struct ifaddrs *cif;
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char *p, *p0;
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struct rt_msghdr *rtm;
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struct if_msghdrl *ifm;
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struct ifa_msghdrl *ifam;
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struct sockaddr_dl *dl;
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struct sockaddr *sa;
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struct ifaddrs *ifa, *ift;
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struct if_data *if_data;
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u_short idx = 0;
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int i;
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size_t len, alen;
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char *data;
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char *names;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0; /* protocol */
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mib[3] = 0; /* wildcard address family */
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mib[4] = NET_RT_IFLISTL;/* extra fields for extensible msghdr structs */
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mib[5] = 0; /* no flags */
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do {
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/*
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* We'll try to get addresses several times in case that
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* the number of addresses is unexpectedly increased during
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* the two sysctl calls. This should rarely happen, but we'll
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* try to do our best for applications that assume success of
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* this library (which should usually be the case).
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* Portability note: since FreeBSD does not add margin of
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* memory at the first sysctl, the possibility of failure on
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* the second sysctl call is a bit higher.
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*/
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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return (-1);
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if ((buf = malloc(needed)) == NULL)
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return (-1);
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
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if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
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free(buf);
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return (-1);
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}
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free(buf);
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buf = NULL;
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}
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} while (buf == NULL);
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for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)(void *)next;
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if (rtm->rtm_version != RTM_VERSION)
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continue;
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switch (rtm->rtm_type) {
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case RTM_IFINFO:
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ifm = (struct if_msghdrl *)(void *)rtm;
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if (ifm->ifm_addrs & RTA_IFP) {
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idx = ifm->ifm_index;
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++icnt;
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if_data = IF_MSGHDRL_IFM_DATA(ifm);
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dcnt += if_data->ifi_datalen;
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dl = (struct sockaddr_dl *)IF_MSGHDRL_RTA(ifm);
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dcnt += SA_RLEN((struct sockaddr *)(void*)dl) +
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ALIGNBYTES;
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ncnt += dl->sdl_nlen + 1;
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} else
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idx = 0;
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break;
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case RTM_NEWADDR:
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ifam = (struct ifa_msghdrl *)(void *)rtm;
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if (idx && ifam->ifam_index != idx)
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abort(); /* this cannot happen */
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#define RTA_MASKS (RTA_NETMASK | RTA_IFA | RTA_BRD)
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if (idx == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
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break;
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p = (char *)IFA_MSGHDRL_RTA(ifam);
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++icnt;
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if_data = IFA_MSGHDRL_IFAM_DATA(ifam);
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dcnt += if_data->ifi_datalen + ALIGNBYTES;
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/* Scan to look for length of address */
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alen = 0;
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for (p0 = p, i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
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== 0)
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continue;
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sa = (struct sockaddr *)(void *)p;
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len = SA_RLEN(sa);
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if (i == RTAX_IFA) {
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alen = len;
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break;
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}
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p += len;
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}
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for (p = p0, i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
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== 0)
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continue;
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sa = (struct sockaddr *)(void *)p;
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len = SA_RLEN(sa);
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if (i == RTAX_NETMASK && SA_LEN(sa) == 0)
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dcnt += alen;
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else
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dcnt += len;
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p += len;
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}
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break;
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}
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}
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if (icnt + dcnt + ncnt == 1) {
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*pif = NULL;
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free(buf);
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return (0);
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}
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data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
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if (data == NULL) {
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free(buf);
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return(-1);
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}
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ifa = (struct ifaddrs *)(void *)data;
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data += sizeof(struct ifaddrs) * icnt;
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names = data + dcnt;
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memset(ifa, 0, sizeof(struct ifaddrs) * icnt);
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ift = ifa;
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idx = 0;
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cif = NULL;
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for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)(void *)next;
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if (rtm->rtm_version != RTM_VERSION)
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continue;
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switch (rtm->rtm_type) {
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case RTM_IFINFO:
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ifm = (struct if_msghdrl *)(void *)rtm;
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if ((ifm->ifm_addrs & RTA_IFP) == 0) {
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idx = 0;
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break;
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}
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idx = ifm->ifm_index;
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dl = (struct sockaddr_dl *)IF_MSGHDRL_RTA(ifm);
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cif = ift;
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ift->ifa_name = names;
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ift->ifa_flags = (int)ifm->ifm_flags;
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memcpy(names, dl->sdl_data, (size_t)dl->sdl_nlen);
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names[dl->sdl_nlen] = 0;
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names += dl->sdl_nlen + 1;
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ift->ifa_addr = (struct sockaddr *)(void *)data;
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memcpy(data, dl, (size_t)SA_LEN((struct sockaddr *)
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(void *)dl));
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data += SA_RLEN((struct sockaddr *)(void *)dl);
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if_data = IF_MSGHDRL_IFM_DATA(ifm);
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/* ifm_data needs to be aligned */
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ift->ifa_data = data = (void *)ALIGN(data);
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memcpy(data, if_data, if_data->ifi_datalen);
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data += if_data->ifi_datalen;
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ift = (ift->ifa_next = ift + 1);
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break;
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case RTM_NEWADDR:
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ifam = (struct ifa_msghdrl *)(void *)rtm;
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if (idx && ifam->ifam_index != idx)
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abort(); /* this cannot happen */
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if (idx == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
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break;
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ift->ifa_name = cif->ifa_name;
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ift->ifa_flags = cif->ifa_flags;
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ift->ifa_data = NULL;
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p = (char *)IFA_MSGHDRL_RTA(ifam);
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/* Scan to look for length of address */
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alen = 0;
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for (p0 = p, i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
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== 0)
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continue;
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sa = (struct sockaddr *)(void *)p;
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len = SA_RLEN(sa);
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if (i == RTAX_IFA) {
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alen = len;
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break;
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}
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p += len;
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}
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for (p = p0, i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
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== 0)
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continue;
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sa = (struct sockaddr *)(void *)p;
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len = SA_RLEN(sa);
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switch (i) {
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case RTAX_IFA:
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ift->ifa_addr =
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(struct sockaddr *)(void *)data;
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memcpy(data, p, len);
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data += len;
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break;
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case RTAX_NETMASK:
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ift->ifa_netmask =
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(struct sockaddr *)(void *)data;
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if (SA_LEN(sa) == 0) {
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memset(data, 0, alen);
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data += alen;
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break;
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}
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memcpy(data, p, len);
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data += len;
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break;
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case RTAX_BRD:
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ift->ifa_broadaddr =
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(struct sockaddr *)(void *)data;
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memcpy(data, p, len);
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data += len;
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break;
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}
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p += len;
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}
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if_data = IFA_MSGHDRL_IFAM_DATA(ifam);
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/* ifam_data needs to be aligned */
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ift->ifa_data = data = (void *)ALIGN(data);
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memcpy(data, if_data, if_data->ifi_datalen);
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data += if_data->ifi_datalen;
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ift = (ift->ifa_next = ift + 1);
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break;
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}
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}
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free(buf);
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if (--ift >= ifa) {
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ift->ifa_next = NULL;
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*pif = ifa;
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} else {
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*pif = NULL;
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free(ifa);
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}
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return (0);
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}
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void
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freeifaddrs(struct ifaddrs *ifp)
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{
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free(ifp);
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}
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