universal iface checking function

configure.ac

@@ -9,6 +9,46 @@ AC_SUBST(VERSION)
 
 AC_PROG_INSTALL
 AC_PROG_CC
+AC_CANONICAL_HOST
+
+case "$host" in
+*-*-linux*)
+	AC_DEFINE([LLADDR(s)], [s->sll_addr], [the link level address])
+;;
+*-*-freebsd*)
+	AC_DEFINE([sockaddr_ll], [sockaddr_dl], [the socket link structures])
+	AC_DEFINE([sll_family], [sdl_family], [the socket family member])
+	AC_DEFINE([AF_PACKET], [AF_LINK], [the domain name])
+	AC_DEFINE([ifr_hwaddr], [ifr_addr], [the address member])
+	AC_DEFINE([SIOCSIFHWADDR], [SIOCSIFLLADDR], [the ioctl call])
+;;
+esac
+
+AC_MSG_CHECKING([if sockaddr has the sa_len member])
+AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM(
+		[[ #include <sys/socket.h> ]],
+		[[ struct sockaddr sock; return (sock.sa_len); ]])],
+	[AC_DEFINE([HAVE_SOCKADDR_SA_LEN], [1],
+		   [socket address structures have length fields])
+])
+
+AC_CHECK_HEADER([ifaddrs.h], ,[AC_MSG_ERROR(
+	[*** ifaddrs.h missing - please install first or check config.log ***])])
+
+AC_CHECK_HEADERS([linux/if_packet.h net/if_dl.h])
+
+if test "x$ac_cv_header_linux_if_packet_h" = "xyes" ; then
+	AC_DEFINE([HAVE_IF_PACKET], [1],
+		    [The Linux if_packet.h header found])
+elif test "x$ac_cv_header_net_if_dl_h" = "xyes" ; then
+	AC_DEFINE([HAVE_IF_DL], [1],
+		    [The BSD if_dl.h header found])
+else
+	AC_MSG_ERROR([*** sockaddr_* missing - please install first or check config.log ***])
+fi
+
+AC_CHECK_HEADER(linux/ethtool.h, AC_DEFINE([HAVE_ETHTOOL], [1], [Linux ethernet headers found]), )
 
 AC_OUTPUT([
 Makefile

src/main.c

@@ -40,9 +40,6 @@
 #include "maclist.h"
 #include "netinfo.h"
 
-#define EXIT_OK    0
-#define EXIT_ERROR 1
-
 static void
 print_help (void)
 {
@@ -54,7 +51,9 @@ print_help (void)
 		"  -e,  --ending                 Don't change the vendor bytes\n"
 		"  -a,  --another                Set random vendor MAC of the same kind\n"
 		"  -A                            Set random vendor MAC of any kind\n"
+#if defined(HAVE_ETHTOOL)
 		"  -p,  --permanent              Reset to original, permanent hardware MAC\n"
+#endif
 		"  -r,  --random                 Set fully random MAC\n"
 		"  -l,  --list[=keyword]         Print known vendors\n"
 		"  -b,  --bia                    Pretend to be a burned-in-address\n"
@@ -116,7 +115,9 @@ main (int argc, char *argv[])
 	char ending       = 0;
 	char another_any  = 0;
 	char another_same = 0;
+#if defined(HAVE_ETHTOOL)
 	char permanent    = 0;
+#endif
 	char print_list   = 0;
 	char show         = 0;
 	char set_bia      = 0;
@@ -131,7 +132,9 @@ main (int argc, char *argv[])
 		{"ending",      no_argument,       NULL, 'e'},
 		{"endding",     no_argument,       NULL, 'e'}, /* kept for backwards compatibility */
 		{"another",     no_argument,       NULL, 'a'},
+#if defined(HAVE_ETHTOOL)
 		{"permanent",   no_argument,       NULL, 'p'},
+#endif
 		{"show",        no_argument,       NULL, 's'},
 		{"another_any", no_argument,       NULL, 'A'},
 		{"bia",         no_argument,       NULL, 'b'},
@@ -142,7 +145,9 @@ main (int argc, char *argv[])
 
 	net_info_t *net;
 	mac_t      *mac;
+#if defined(HAVE_ETHTOOL)
 	mac_t      *mac_permanent;
+#endif
 	mac_t      *mac_faked;
 	char       *device_name;
 	int         val;
@@ -158,7 +163,7 @@ main (int argc, char *argv[])
 				"This is free software; see the source for copying conditions.  There is NO\n"
 				"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
 				VERSION);
-			exit (EXIT_OK);
+			exit (EXIT_SUCCESS);
 			break;
 		case 'l':
 			print_list = 1;
@@ -182,36 +187,38 @@ main (int argc, char *argv[])
 		case 'A':
 			another_any = 1;
 			break;
+#if defined(HAVE_ETHTOOL)
 		case 'p':
 			permanent = 1;
 			break;
+#endif
 		case 'm':
 			set_mac = optarg;
 			break;
 		case 'h':
 		case '?':
 		default:
 			print_help();
-			exit (EXIT_OK);
+			exit (EXIT_SUCCESS);
 			break;
 		}
 	}
 
 	/* Read the MAC lists */
 	if (mc_maclist_init() < 0) {
-		exit (EXIT_ERROR);
+		exit (EXIT_FAILURE);
 	}
 
 	/* Print list? */
 	if (print_list) {
 		mc_maclist_print(search_word);
-		exit (EXIT_OK);
+		exit (EXIT_SUCCESS);
 	}
 
 	/* Get device name argument */
 	if (optind >= argc) {
 		print_usage();
-		exit (EXIT_OK);
+		exit (EXIT_SUCCESS);
 	}
 	device_name = argv[optind];
 
@@ -220,10 +227,12 @@ main (int argc, char *argv[])
 
 	/* Read the MAC */
 	if ((net = mc_net_info_new(device_name)) == NULL) {
-		exit (EXIT_ERROR);
+		exit (EXIT_FAILURE);
 	}
 	mac = mc_net_info_get_mac(net);
+#if defined(HAVE_ETHTOOL)
 	mac_permanent = mc_net_info_get_permanent_mac(net);
+#endif
 
 	/* --bia can only be used with --random */
 	if (set_bia  &&  !random) {
@@ -232,16 +241,18 @@ main (int argc, char *argv[])
 
 	/* Print the current MAC info */
 	print_mac ("Current MAC:   ", mac);
+#if defined(HAVE_ETHTOOL)
 	print_mac ("Permanent MAC: ", mac_permanent);
+#endif
 
 	/* Change the MAC */
 	mac_faked = mc_mac_dup (mac);
 
 	if (show) {
-		exit (EXIT_OK);
+		exit (EXIT_SUCCESS);
 	} else if (set_mac) {
 		if (mc_mac_read_string (mac_faked, set_mac) < 0) {
-			exit (EXIT_ERROR);
+			exit (EXIT_FAILURE);
 		}
 	} else if (random) {
 		mc_mac_random (mac_faked, 6, set_bia);
@@ -254,10 +265,12 @@ main (int argc, char *argv[])
 	} else if (another_any) {
 		mc_maclist_set_random_vendor(mac_faked, mac_is_anykind);
 		mc_mac_random (mac_faked, 3, 1);
+#if defined(HAVE_ETHTOOL)
 	} else if (permanent) {
 		mac_faked = mc_mac_dup (mac_permanent);
+#endif
 	} else {
-		exit (EXIT_OK); /* default to show */
+		exit (EXIT_SUCCESS); /* default to show */
 	}
 
 	/* Set the new MAC */
@@ -279,9 +292,11 @@ main (int argc, char *argv[])
 	/* Memory free */
 	mc_mac_free (mac);
 	mc_mac_free (mac_faked);
+#if defined(HAVE_ETHTOOL)
 	mc_mac_free (mac_permanent);
+#endif
 	mc_net_info_free (net);
 	mc_maclist_free();
 
-	return (ret == 0) ? EXIT_OK : EXIT_ERROR;
+	return (ret == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 }

src/netinfo.c

@@ -23,14 +23,30 @@
  * USA
  */
 
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/ioctl.h>
 
-#include <linux/ethtool.h>
-#include <linux/sockios.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+#include <net/ethernet.h>
+
+#if defined(HAVE_IF_PACKET)
+# include <linux/if_packet.h>
+#elif defined(HAVE_IF_DL)
+# include <net/if_dl.h>
+#endif
+
+#if defined(HAVE_ETHTOOL)
+# include <linux/ethtool.h>
+# include <linux/sockios.h>
+#endif
 
 #include "netinfo.h"
 
@@ -49,7 +65,7 @@ mc_net_info_new (const char *device)
 
 	strncpy (new->dev.ifr_name, device, sizeof(new->dev.ifr_name));
 	new->dev.ifr_name[sizeof(new->dev.ifr_name)-1] = '\0';
-	if (ioctl(new->sock, SIOCGIFHWADDR, &new->dev) < 0) {
+	if (if_nametoindex(device) == 0) {
 		perror ("[ERROR] Set device name");
 		free(new);
 		return NULL;
@@ -66,29 +82,55 @@ mc_net_info_free (net_info_t *net)
 	free(net);
 }
 
-
 mac_t *
 mc_net_info_get_mac (const net_info_t *net)
 {
-	int    i;
-	mac_t *new = (mac_t *) malloc (sizeof(mac_t));
+	int i;
+	mac_t *mac = (mac_t *) malloc (sizeof(mac_t));
+	u_char *lladr;
 
-	for (i=0; i<6; i++) {
-		new->byte[i] = net->dev.ifr_hwaddr.sa_data[i] & 0xFF;
-	}
+	struct ifaddrs *ifap, *ifa;
+	struct sockaddr_ll *sdl;
 
-	return new;
-}
+	if (getifaddrs(&ifap) == 0) {
+		for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+
+			sdl = (struct sockaddr_ll *) ifa->ifa_addr;
 
+			if (strcmp(ifa->ifa_name, net->dev.ifr_name) != 0)
+				continue;
+
+			if (!sdl && sdl->sll_family != AF_PACKET)
+				continue;
+
+			lladr = (u_char *) LLADDR(sdl);
+			for (i=0; i<6; i++)
+				mac->byte[i] = lladr[i] & 0xFF;
+			break;
+		}
+		freeifaddrs(ifap);
+	} else
+		perror("getifaddrs");
+
+	return mac;
+}
 
 int
 mc_net_info_set_mac (net_info_t *net, const mac_t *mac)
 {
 	int i;
+#if defined(HAVE_ETHTOOL)
+	if (ioctl(net->sock, SIOCGIFHWADDR, &net->dev) < 0) {
+		perror ("[ERROR] Set ifreq structure");
+		return -1;
+	}
+#elif defined(HAVE_SOCKADDR_SA_LEN)
+	net->dev.ifr_addr.sa_family = AF_PACKET;
+	net->dev.ifr_addr.sa_len    = ETHER_ADDR_LEN;
+#endif
 
-	for (i=0; i<6; i++) {
+	for (i=0; i<6; i++)
 		net->dev.ifr_hwaddr.sa_data[i] = mac->byte[i];
-	}
 
 	if (ioctl(net->sock, SIOCSIFHWADDR, &net->dev) < 0) {
 		perror ("[ERROR] Could not change MAC: interface up or insufficient permissions");
@@ -98,6 +140,7 @@ mc_net_info_set_mac (net_info_t *net, const mac_t *mac)
 	return 0;
 }
 
+#if defined(HAVE_ETHTOOL)
 mac_t *
 mc_net_info_get_permanent_mac (const net_info_t *net)
 {
@@ -126,3 +169,4 @@ mc_net_info_get_permanent_mac (const net_info_t *net)
 	free(epa);
 	return newmac;
 }
+#endif