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rewrite SIOCGIFCONF into getifaddrs(3)

This commit is contained in:
itojun 2003-08-17 21:36:56 +00:00
parent d56baf4735
commit 0f6ff2de74
1 changed files with 60 additions and 72 deletions
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132
usr.sbin/pppd/pppd/sys-bsd.c
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@ -1,4 +1,4 @@
/* $NetBSD: sys-bsd.c,v 1.43 2003/06/09 13:35:10 christos Exp $ */
/* $NetBSD: sys-bsd.c,v 1.44 2003/08/17 21:36:56 itojun Exp $ */
/*
* sys-bsd.c - System-dependent procedures for setting up
@ -79,7 +79,7 @@
#if 0
#define RCSID "Id: sys-bsd.c,v 1.47 2000/04/13 12:04:23 paulus Exp "
#else
__RCSID("$NetBSD: sys-bsd.c,v 1.43 2003/06/09 13:35:10 christos Exp $");
__RCSID("$NetBSD: sys-bsd.c,v 1.44 2003/08/17 21:36:56 itojun Exp $");
#endif
#endif
@ -118,6 +118,7 @@ __RCSID("$NetBSD: sys-bsd.c,v 1.43 2003/06/09 13:35:10 christos Exp $");
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#endif
#include <ifaddrs.h>
#if RTM_VERSION >= 3
#include <sys/param.h>
@ -1725,75 +1726,67 @@ get_ether_addr(ipaddr, hwaddr)
u_int32_t ipaddr;
struct sockaddr_dl *hwaddr;
{
struct ifreq *ifr, *ifend, *ifp;
u_int32_t ina, mask;
struct sockaddr_dl *dla;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
error("ioctl(SIOCGIFCONF): %m");
return 0;
}
struct ifaddrs *ifap, *ifa, *ifp;
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
if (ifr->ifr_addr.sa_family == AF_INET) {
ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if ((ifreq.ifr_flags &
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
!= (IFF_UP|IFF_BROADCAST))
continue;
/*
* Get its netmask and check that it's on the right subnet.
*/
if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
continue;
mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
}
if (getifaddrs(&ifap) != 0) {
error("getifaddrs: %m");
return 0;
}
if (ifr >= ifend)
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ina = ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr.s_addr;
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
if ((ifa->ifa_flags &
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
!= (IFF_UP|IFF_BROADCAST))
continue;
/*
* Get its netmask and check that it's on the right subnet.
*/
mask = ((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
}
if (!ifa) {
freeifaddrs(ifap);
return 0;
info("found interface %s for proxy arp", ifr->ifr_name);
}
info("found interface %s for proxy arp", ifa->ifa_name);
ifp = ifa;
/*
* Now scan through again looking for a link-level address
* for this interface.
*/
ifp = ifr;
for (ifr = ifc.ifc_req; ifr < ifend; ) {
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
&& ifr->ifr_addr.sa_family == AF_LINK) {
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *) &ifr->ifr_addr;
BCOPY(dla, hwaddr, dla->sdl_len);
return 1;
}
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (strcmp(ifp->ifa_name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *) &ifa->ifa_addr;
BCOPY(dla, hwaddr, dla->sdl_len);
freeifaddrs(ifap);
return 1;
}
freeifaddrs(ifap);
return 0;
}
@ -1831,38 +1824,33 @@ get_if_hwaddr(addr, name)
char *
get_first_ethernet()
{
struct ifreq *ifr, *ifend;
static struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
static char ifname[IFNAMSIZ];
struct ifaddrs *ifap, *ifa;
/*
* Scan through the system's network interfaces.
*/
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
warn("ioctl(SIOCGIFCONF): %m");
if (getifaddrs(&ifap) != 0) {
warn("getifaddrs: %m");
return NULL;
}
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
/*
* Check the interface's internet address.
*/
if (ifr->ifr_addr.sa_family != AF_INET)
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/*
* Check that the interface is up, and not point-to-point or loopback.
*/
strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
!= IFF_UP)
return ifreq.ifr_name;
if ((ifa->ifa_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
!= IFF_UP) {
strlcpy(ifname, ifa->ifa_name, sizeof(ifname));
freeifaddrs(ifap);
return ifname;
}
}
freeifaddrs(ifap);
return NULL;
}