sudo-1.7.4p4/interfaces.c - nest-learning-thermostat/5.1.5/sudo - Git at Google

 /*
  * Copyright (c) 1996, 1998-2005, 2007-2010
  *	Todd C. Miller <Todd.Miller@courtesan.com>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
  * Sponsored in part by the Defense Advanced Research Projects
  * Agency (DARPA) and Air Force Research Laboratory, Air Force
  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  */

 /*
  * Suppress a warning w/ gcc on Digital UN*X.
  * The system headers should really do this....
  */
 #if defined(__osf__) && !defined(__cplusplus)
 struct mbuf;
 struct rtentry;
 #endif

 #include <config.h>

 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/param.h>
 #include <sys/time.h>
 #include <sys/ioctl.h>
 #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
 # include <sys/sockio.h>
 #endif
 #include <stdio.h>
 #ifdef STDC_HEADERS
 # include <stdlib.h>
 # include <stddef.h>
 #else
 # ifdef HAVE_STDLIB_H
 #  include <stdlib.h>
 # endif
 #endif /* STDC_HEADERS */
 #ifdef HAVE_STRING_H
 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
 #  include <memory.h>
 # endif
 # include <string.h>
 #endif /* HAVE_STRING_H */
 #ifdef HAVE_STRINGS_H
 # include <strings.h>
 #endif /* HAVE_STRINGS_H */
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif /* HAVE_UNISTD_H */
 #include <netdb.h>
 #include <errno.h>
 #ifdef _ISC
 # include <sys/stream.h>
 # include <sys/sioctl.h>
 # include <sys/stropts.h>
 # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
 				 strioctl.ic_dp=(param);\
 				 strioctl.ic_timout=0;\
 				 strioctl.ic_len=(len);}
 #endif /* _ISC */
 #ifdef _MIPS
 # include <net/soioctl.h>
 #endif /* _MIPS */
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <net/if.h>
 #ifdef HAVE_GETIFADDRS
 # include <ifaddrs.h>
 #endif

 #include "sudo.h"
 #include "interfaces.h"

 /* Minix apparently lacks IFF_LOOPBACK */
 #ifndef IFF_LOOPBACK
 # define IFF_LOOPBACK	0
 #endif

 #ifdef HAVE_GETIFADDRS

 /*
  * Allocate and fill in the interfaces global variable with the
  * machine's ip addresses and netmasks.
  */
 void
 load_interfaces()
 {
     struct ifaddrs *ifa, *ifaddrs;
     struct sockaddr_in *sin;
 #ifdef HAVE_IN6_ADDR
     struct sockaddr_in6 *sin6;
 #endif
     int i;

     if (getifaddrs(&ifaddrs))
 	return;

     /* Allocate space for the interfaces list. */
     for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
 	/* Skip interfaces marked "down" and "loopback". */
 	if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
 	    ISSET(ifa->ifa_flags, IFF_LOOPBACK))
 	    continue;

 	switch(ifa->ifa_addr->sa_family) {
 	    case AF_INET:
 #ifdef HAVE_IN6_ADDR
 	    case AF_INET6:
 #endif
 		num_interfaces++;
 		break;
 	}
     }
     if (num_interfaces == 0)
 	return;
     interfaces =
 	(struct interface *) emalloc2(num_interfaces, sizeof(struct interface));

     /* Store the ip addr / netmask pairs. */
     for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
 	/* Skip interfaces marked "down" and "loopback". */
 	if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
 	    ISSET(ifa->ifa_flags, IFF_LOOPBACK))
 		continue;

 	switch(ifa->ifa_addr->sa_family) {
 	    case AF_INET:
 		sin = (struct sockaddr_in *)ifa->ifa_addr;
 		if (sin == NULL)
 		    continue;
 		memcpy(&interfaces[i].addr, &sin->sin_addr,
 		    sizeof(struct in_addr));
 		sin = (struct sockaddr_in *)ifa->ifa_netmask;
 		if (sin == NULL)
 		    continue;
 		memcpy(&interfaces[i].netmask, &sin->sin_addr,
 		    sizeof(struct in_addr));
 		interfaces[i].family = AF_INET;
 		i++;
 		break;
 #ifdef HAVE_IN6_ADDR
 	    case AF_INET6:
 		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 		if (sin6 == NULL)
 		    continue;
 		memcpy(&interfaces[i].addr, &sin6->sin6_addr,
 		    sizeof(struct in6_addr));
 		sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
 		if (sin6 == NULL)
 		    continue;
 		memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
 		    sizeof(struct in6_addr));
 		interfaces[i].family = AF_INET6;
 		i++;
 		break;
 #endif /* HAVE_IN6_ADDR */
 	}
     }
 #ifdef HAVE_FREEIFADDRS
     freeifaddrs(ifaddrs);
 #else
     efree(ifaddrs);
 #endif
 }

 #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)

 /*
  * Allocate and fill in the interfaces global variable with the
  * machine's ip addresses and netmasks.
  */
 void
 load_interfaces()
 {
     struct ifconf *ifconf;
     struct ifreq *ifr, ifr_tmp;
     struct sockaddr_in *sin;
     int sock, n, i;
     size_t len = sizeof(struct ifconf) + BUFSIZ;
     char *previfname = "", *ifconf_buf = NULL;
 #ifdef _ISC
     struct strioctl strioctl;
 #endif /* _ISC */

     sock = socket(AF_INET, SOCK_DGRAM, 0);
     if (sock < 0)
 	error(1, "cannot open socket");

     /*
      * Get interface configuration or return (leaving num_interfaces == 0)
      */
     for (;;) {
 	ifconf_buf = erealloc(ifconf_buf, len);
 	ifconf = (struct ifconf *) ifconf_buf;
 	ifconf->ifc_len = len - sizeof(struct ifconf);
 	ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));

 #ifdef _ISC
 	STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
 	if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
 #else
 	/* Note that some kernels return EINVAL if the buffer is too small */
 	if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
 #endif /* _ISC */
 	    efree(ifconf_buf);
 	    (void) close(sock);
 	    return;
 	}

 	/* Break out of loop if we have a big enough buffer. */
 	if (ifconf->ifc_len + sizeof(struct ifreq) < len)
 	    break;
 	len += BUFSIZ;
     }

     /* Allocate space for the maximum number of interfaces that could exist. */
     if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
 	return;
     interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));

     /* For each interface, store the ip address and netmask. */
     for (i = 0; i < ifconf->ifc_len; ) {
 	/* Get a pointer to the current interface. */
 	ifr = (struct ifreq *) &ifconf->ifc_buf[i];

 	/* Set i to the subscript of the next interface. */
 	i += sizeof(struct ifreq);
 #ifdef HAVE_SA_LEN
 	if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
 	    i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
 #endif /* HAVE_SA_LEN */

 	/* Skip duplicates and interfaces with NULL addresses. */
 	sin = (struct sockaddr_in *) &ifr->ifr_addr;
 	if (sin->sin_addr.s_addr == 0 ||
 	    strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
 	    continue;

 	if (ifr->ifr_addr.sa_family != AF_INET)
 		continue;

 #ifdef SIOCGIFFLAGS
 	zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
 	strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
 	if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
 #endif
 	    ifr_tmp = *ifr;

 	/* Skip interfaces marked "down" and "loopback". */
 	if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
 	    ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
 		continue;

 	sin = (struct sockaddr_in *) &ifr->ifr_addr;
 	interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;

 	/* Stash the name of the interface we saved. */
 	previfname = ifr->ifr_name;

 	/* Get the netmask. */
 	zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
 	strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
 #ifdef SIOCGIFNETMASK
 #ifdef _ISC
 	STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
 	if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
 #else
 	if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
 #endif /* _ISC */
 	    sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;

 	    interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
 	} else {
 #else
 	{
 #endif /* SIOCGIFNETMASK */
 	    if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
 		interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
 	    else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
 		interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
 	    else
 		interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
 	}

 	/* Only now can we be sure it was a good/interesting interface. */
 	interfaces[num_interfaces].family = AF_INET;
 	num_interfaces++;
     }

     /* If the expected size < real size, realloc the array. */
     if (n != num_interfaces) {
 	if (num_interfaces != 0)
 	    interfaces = (struct interface *) erealloc3(interfaces,
 		num_interfaces, sizeof(struct interface));
 	else
 	    efree(interfaces);
     }
     efree(ifconf_buf);
     (void) close(sock);
 }

 #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */

 /*
  * Stub function for those without SIOCGIFCONF
  */
 void
 load_interfaces()
 {
     return;
 }

 #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */

 void
 dump_interfaces()
 {
     int i;
 #ifdef HAVE_IN6_ADDR
     char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
 #endif

     puts("Local IP address and netmask pairs:");
     for (i = 0; i < num_interfaces; i++) {
 	switch(interfaces[i].family) {
 	    case AF_INET:
 		printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
 		puts(inet_ntoa(interfaces[i].netmask.ip4));
 		break;
 #ifdef HAVE_IN6_ADDR
 	    case AF_INET6:
 		inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
 		    addrbuf, sizeof(addrbuf));
 		inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
 		    maskbuf, sizeof(maskbuf));
 		printf("\t%s / %s\n", addrbuf, maskbuf);
 		break;
 #endif /* HAVE_IN6_ADDR */
 	}
     }
 }
	/*
	* Copyright (c) 1996, 1998-2005, 2007-2010
	* Todd C. Miller <Todd.Miller@courtesan.com>
	*
	* Permission to use, copy, modify, and distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*
	* Sponsored in part by the Defense Advanced Research Projects
	* Agency (DARPA) and Air Force Research Laboratory, Air Force
	* Materiel Command, USAF, under agreement number F39502-99-1-0512.
	*/

	/*
	* Suppress a warning w/ gcc on Digital UN*X.
	* The system headers should really do this....
	*/
	#if defined(__osf__) && !defined(__cplusplus)
	struct mbuf;
	struct rtentry;
	#endif

	#include <config.h>

	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/ioctl.h>
	#if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
	# include <sys/sockio.h>
	#endif
	#include <stdio.h>
	#ifdef STDC_HEADERS
	# include <stdlib.h>
	# include <stddef.h>
	#else
	# ifdef HAVE_STDLIB_H
	# include <stdlib.h>
	# endif
	#endif /* STDC_HEADERS */
	#ifdef HAVE_STRING_H
	# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
	# include <memory.h>
	# endif
	# include <string.h>
	#endif /* HAVE_STRING_H */
	#ifdef HAVE_STRINGS_H
	# include <strings.h>
	#endif /* HAVE_STRINGS_H */
	#ifdef HAVE_UNISTD_H
	# include <unistd.h>
	#endif /* HAVE_UNISTD_H */
	#include <netdb.h>
	#include <errno.h>
	#ifdef _ISC
	# include <sys/stream.h>
	# include <sys/sioctl.h>
	# include <sys/stropts.h>
	# define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
	strioctl.ic_dp=(param);\
	strioctl.ic_timout=0;\
	strioctl.ic_len=(len);}
	#endif /* _ISC */
	#ifdef _MIPS
	# include <net/soioctl.h>
	#endif /* _MIPS */
	#include <netinet/in.h>
	#include <arpa/inet.h>
	#include <net/if.h>
	#ifdef HAVE_GETIFADDRS
	# include <ifaddrs.h>
	#endif

	#include "sudo.h"
	#include "interfaces.h"

	/* Minix apparently lacks IFF_LOOPBACK */
	#ifndef IFF_LOOPBACK
	# define IFF_LOOPBACK 0
	#endif

	#ifdef HAVE_GETIFADDRS

	/*
	* Allocate and fill in the interfaces global variable with the
	* machine's ip addresses and netmasks.
	*/
	void
	load_interfaces()
	{
	struct ifaddrs ifa, ifaddrs;
	struct sockaddr_in *sin;
	#ifdef HAVE_IN6_ADDR
	struct sockaddr_in6 *sin6;
	#endif
	int i;

	if (getifaddrs(&ifaddrs))
	return;

	/* Allocate space for the interfaces list. */
	for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
	/* Skip interfaces marked "down" and "loopback". */
	if (ifa->ifa_addr == NULL \|\| !ISSET(ifa->ifa_flags, IFF_UP) \|\|
	ISSET(ifa->ifa_flags, IFF_LOOPBACK))
	continue;

	switch(ifa->ifa_addr->sa_family) {
	case AF_INET:
	#ifdef HAVE_IN6_ADDR
	case AF_INET6:
	#endif
	num_interfaces++;
	break;
	}
	}
	if (num_interfaces == 0)
	return;
	interfaces =
	(struct interface *) emalloc2(num_interfaces, sizeof(struct interface));

	/* Store the ip addr / netmask pairs. */
	for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
	/* Skip interfaces marked "down" and "loopback". */
	if (ifa->ifa_addr == NULL \|\| !ISSET(ifa->ifa_flags, IFF_UP) \|\|
	ISSET(ifa->ifa_flags, IFF_LOOPBACK))
	continue;

	switch(ifa->ifa_addr->sa_family) {
	case AF_INET:
	sin = (struct sockaddr_in *)ifa->ifa_addr;
	if (sin == NULL)
	continue;
	memcpy(&interfaces[i].addr, &sin->sin_addr,
	sizeof(struct in_addr));
	sin = (struct sockaddr_in *)ifa->ifa_netmask;
	if (sin == NULL)
	continue;
	memcpy(&interfaces[i].netmask, &sin->sin_addr,
	sizeof(struct in_addr));
	interfaces[i].family = AF_INET;
	i++;
	break;
	#ifdef HAVE_IN6_ADDR
	case AF_INET6:
	sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
	if (sin6 == NULL)
	continue;
	memcpy(&interfaces[i].addr, &sin6->sin6_addr,
	sizeof(struct in6_addr));
	sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
	if (sin6 == NULL)
	continue;
	memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
	sizeof(struct in6_addr));
	interfaces[i].family = AF_INET6;
	i++;
	break;
	#endif /* HAVE_IN6_ADDR */
	}
	}
	#ifdef HAVE_FREEIFADDRS
	freeifaddrs(ifaddrs);
	#else
	efree(ifaddrs);
	#endif
	}

	#elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)

	/*
	* Allocate and fill in the interfaces global variable with the
	* machine's ip addresses and netmasks.
	*/
	void
	load_interfaces()
	{
	struct ifconf *ifconf;
	struct ifreq *ifr, ifr_tmp;
	struct sockaddr_in *sin;
	int sock, n, i;
	size_t len = sizeof(struct ifconf) + BUFSIZ;
	char previfname = "", ifconf_buf = NULL;
	#ifdef _ISC
	struct strioctl strioctl;
	#endif /* _ISC */

	sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (sock < 0)
	error(1, "cannot open socket");

	/*
	* Get interface configuration or return (leaving num_interfaces == 0)
	*/
	for (;;) {
	ifconf_buf = erealloc(ifconf_buf, len);
	ifconf = (struct ifconf *) ifconf_buf;
	ifconf->ifc_len = len - sizeof(struct ifconf);
	ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));

	#ifdef _ISC
	STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
	if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
	#else
	/* Note that some kernels return EINVAL if the buffer is too small */
	if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
	#endif /* _ISC */
	efree(ifconf_buf);
	(void) close(sock);
	return;
	}

	/* Break out of loop if we have a big enough buffer. */
	if (ifconf->ifc_len + sizeof(struct ifreq) < len)
	break;
	len += BUFSIZ;
	}

	/* Allocate space for the maximum number of interfaces that could exist. */
	if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
	return;
	interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));

	/* For each interface, store the ip address and netmask. */
	for (i = 0; i < ifconf->ifc_len; ) {
	/* Get a pointer to the current interface. */
	ifr = (struct ifreq *) &ifconf->ifc_buf[i];

	/* Set i to the subscript of the next interface. */
	i += sizeof(struct ifreq);
	#ifdef HAVE_SA_LEN
	if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
	i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
	#endif /* HAVE_SA_LEN */

	/* Skip duplicates and interfaces with NULL addresses. */
	sin = (struct sockaddr_in *) &ifr->ifr_addr;
	if (sin->sin_addr.s_addr == 0 \|\|
	strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
	continue;

	if (ifr->ifr_addr.sa_family != AF_INET)
	continue;

	#ifdef SIOCGIFFLAGS
	zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
	strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
	if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
	#endif
	ifr_tmp = *ifr;

	/* Skip interfaces marked "down" and "loopback". */
	if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) \|\|
	ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
	continue;

	sin = (struct sockaddr_in *) &ifr->ifr_addr;
	interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;

	/* Stash the name of the interface we saved. */
	previfname = ifr->ifr_name;

	/* Get the netmask. */
	zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
	strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
	#ifdef SIOCGIFNETMASK
	#ifdef _ISC
	STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
	if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
	#else
	if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
	#endif /* _ISC */
	sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;

	interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
	} else {
	#else
	{
	#endif /* SIOCGIFNETMASK */
	if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
	interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
	else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
	interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
	else
	interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
	}

	/* Only now can we be sure it was a good/interesting interface. */
	interfaces[num_interfaces].family = AF_INET;
	num_interfaces++;
	}

	/* If the expected size < real size, realloc the array. */
	if (n != num_interfaces) {
	if (num_interfaces != 0)
	interfaces = (struct interface *) erealloc3(interfaces,
	num_interfaces, sizeof(struct interface));
	else
	efree(interfaces);
	}
	efree(ifconf_buf);
	(void) close(sock);
	}

	#else /* !SIOCGIFCONF \|\| STUB_LOAD_INTERFACES */

	/*
	* Stub function for those without SIOCGIFCONF
	*/
	void
	load_interfaces()
	{
	return;
	}

	#endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */

	void
	dump_interfaces()
	{
	int i;
	#ifdef HAVE_IN6_ADDR
	char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
	#endif

	puts("Local IP address and netmask pairs:");
	for (i = 0; i < num_interfaces; i++) {
	switch(interfaces[i].family) {
	case AF_INET:
	printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
	puts(inet_ntoa(interfaces[i].netmask.ip4));
	break;
	#ifdef HAVE_IN6_ADDR
	case AF_INET6:
	inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
	addrbuf, sizeof(addrbuf));
	inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
	maskbuf, sizeof(maskbuf));
	printf("\t%s / %s\n", addrbuf, maskbuf);
	break;
	#endif /* HAVE_IN6_ADDR */
	}
	}
	}