#ifndef lint
static const char rcsid[] =
"@(#) $Id: ifaddrlist.c,v 1.3 2006/02/07 06:22:57 lindak Exp $ (LBL)";
#endif
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#include <sys/time.h>
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#include "ifaddrlist.h"
int
ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
{
register int fd, nipaddr;
#ifdef HAVE_SOCKADDR_SA_LEN
register int n;
#endif
register struct ifreq *ifrp, *ifend, *ifnext, *mp;
register struct sockaddr_in *sin;
register struct ifaddrlist *al;
struct ifconf ifc;
struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
#define MAX_IPADDR (sizeof(ibuf) / sizeof(ibuf[0]))
static struct ifaddrlist ifaddrlist[MAX_IPADDR];
char device[sizeof(ifr.ifr_name) + 1];
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
(void)sprintf(errbuf, "socket: %s", strerror(errno));
return (-1);
}
ifc.ifc_len = sizeof(ibuf);
ifc.ifc_buf = (caddr_t)ibuf;
if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
ifc.ifc_len < sizeof(struct ifreq)) {
if (errno == EINVAL)
(void)sprintf(errbuf,
"SIOCGIFCONF: ifreq struct too small (%d bytes)",
(int)sizeof(ibuf));
else
(void)sprintf(errbuf, "SIOCGIFCONF: %s",
strerror(errno));
(void)close(fd);
return (-1);
}
ifrp = ibuf;
ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
al = ifaddrlist;
mp = NULL;
nipaddr = 0;
for (; ifrp < ifend; ifrp = ifnext) {
#ifdef HAVE_SOCKADDR_SA_LEN
n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
if (n < sizeof(*ifrp))
ifnext = ifrp + 1;
else
ifnext = (struct ifreq *)((char *)ifrp + n);
if (ifrp->ifr_addr.sa_family != AF_INET)
continue;
#else
ifnext = ifrp + 1;
#endif
strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
if (errno == ENXIO)
continue;
(void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
(int)sizeof(ifr.ifr_name), ifr.ifr_name,
strerror(errno));
(void)close(fd);
return (-1);
}
if ((ifr.ifr_flags & IFF_UP) == 0)
continue;
(void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name));
device[sizeof(device) - 1] = '\0';
#ifdef sun
if (strchr(device, ':') != NULL)
continue;
#endif
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
(void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
device, strerror(errno));
(void)close(fd);
return (-1);
}
if (nipaddr >= MAX_IPADDR) {
(void)sprintf(errbuf, "Too many interfaces (%d)",
(int)MAX_IPADDR);
(void)close(fd);
return (-1);
}
sin = (struct sockaddr_in *)&ifr.ifr_addr;
al->addr = sin->sin_addr.s_addr;
al->device = strdup(device);
++al;
++nipaddr;
}
(void)close(fd);
*ipaddrp = ifaddrlist;
return (nipaddr);
}