mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-05 09:14:03 +00:00
371df6c6ad
Approved by: bms@
198 lines
4.7 KiB
C
198 lines
4.7 KiB
C
/*
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* Copyright (c) 2003 Bruce M. Simpson.
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* 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/sysctl.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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#include <net/if_dl.h>
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#include <net/route.h>
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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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#include "un-namespace.h"
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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) : \
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(SALIGN + 1))
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#define MAX_SYSCTL_TRY 5
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#define RTA_MASKS (RTA_GATEWAY | RTA_IFP | RTA_IFA)
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int
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getifmaddrs(struct ifmaddrs **pif)
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{
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int icnt = 1;
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int dcnt = 0;
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int ntry = 0;
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size_t len;
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size_t needed;
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int mib[6];
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int i;
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char *buf;
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char *data;
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char *next;
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char *p;
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struct ifma_msghdr *ifmam;
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struct ifmaddrs *ifa, *ift;
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struct rt_msghdr *rtm;
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struct sockaddr *sa;
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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_IFMALIST;
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mib[5] = 0; /* no flags */
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do {
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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_NEWMADDR:
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ifmam = (struct ifma_msghdr *)(void *)rtm;
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if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
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break;
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icnt++;
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p = (char *)(ifmam + 1);
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for (i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifmam->ifmam_addrs &
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(1 << i)) == 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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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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data = malloc(sizeof(struct ifmaddrs) * icnt + dcnt);
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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 ifmaddrs *)(void *)data;
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data += sizeof(struct ifmaddrs) * icnt;
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memset(ifa, 0, sizeof(struct ifmaddrs) * icnt);
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ift = ifa;
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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_NEWMADDR:
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ifmam = (struct ifma_msghdr *)(void *)rtm;
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if ((ifmam->ifmam_addrs & RTA_IFA) == 0)
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break;
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p = (char *)(ifmam + 1);
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for (i = 0; i < RTAX_MAX; i++) {
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if ((RTA_MASKS & ifmam->ifmam_addrs &
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(1 << i)) == 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_GATEWAY:
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ift->ifma_lladdr =
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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_IFP:
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ift->ifma_name =
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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_IFA:
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ift->ifma_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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default:
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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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ift->ifma_next = ift + 1;
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ift = ift->ifma_next;
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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--;
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ift->ifma_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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freeifmaddrs(struct ifmaddrs *ifmp)
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{
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free(ifmp);
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}
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