370 lines
8.8 KiB
C
370 lines
8.8 KiB
C
/* $NetBSD: getifaddrs.c,v 1.1 2000/02/23 06:57:46 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 2.11 1999/03/15 20:57:20 jch Exp
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
#ifdef NET_RT_IFLIST
|
|
#include <sys/param.h>
|
|
#include <net/route.h>
|
|
#include <sys/sysctl.h>
|
|
#include <net/if_dl.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#include <ifaddrs.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#if !defined(AF_LINK)
|
|
#define SA_LEN(sa) sizeof(struct sockaddr)
|
|
#endif
|
|
|
|
#if !defined(SA_LEN)
|
|
#define SA_LEN(sa) (sa)->sa_len
|
|
#endif
|
|
|
|
#define SALIGN (sizeof(long) - 1)
|
|
#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
|
|
|
|
#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
|
|
|
|
#if _BSDI_VERSION >= 199701
|
|
#define HAVE_IFM_DATA
|
|
#endif
|
|
|
|
#if _BSDI_VERSION >= 199802
|
|
#define HAVE_IFAM_DATA
|
|
#endif
|
|
|
|
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;
|
|
struct ifaddrs *ifa, *ift;
|
|
u_short index = 0;
|
|
#else /* NET_RT_IFLIST */
|
|
char buf[1024];
|
|
int m, sock;
|
|
struct ifconf ifc;
|
|
struct ifreq *ifr;
|
|
struct ifreq *lifr;
|
|
#endif /* NET_RT_IFLIST */
|
|
int i;
|
|
size_t len, alen;
|
|
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)) < 0)
|
|
return (-1);
|
|
i = ioctl(sock, SIOCGIFCONF, (char *)&ifc);
|
|
close(sock);
|
|
if (i < 0)
|
|
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);
|
|
}
|