1 files changed, 47 insertions, 99 deletions

diff --git a/src/lib/libc/net/if_nametoindex.c b/src/lib/libc/net/if_nametoindex.c
index e7e8b6c22a..8bd792b949 100644
--- a/src/lib/libc/net/if_nametoindex.c
+++ b/src/lib/libc/net/if_nametoindex.c
@@ -1,26 +1,20 @@
-/*
- * Copyright (c) 1998-1999, Craig Metz, All rights reserved.
+/*      $OpenBSD: if_nametoindex.c,v 1.8 2002/03/07 22:40:23 millert Exp $      */
+/*      $KAME: if_nametoindex.c,v 1.5 2000/11/24 08:04:40 itojun Exp $  */
+
+/*-
+ * Copyright (c) 1997, 2000
+ *      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.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *      This product includes software developed by Craig Metz and
- *      by other contributors.
- * 4. Neither the name of the author nor the names of contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
  *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * 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 THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * 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)
@@ -28,106 +22,60 @@
  * 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 Id: if_nametoindex.c,v 2.3 2000/04/17 22:38:05 dab Exp
  */
 
 #include <sys/types.h>
-#include <stdlib.h>
 #include <sys/socket.h>
-#include <sys/ioctl.h>
 #include <net/if.h>
 #include <net/if_dl.h>
+#include <ifaddrs.h>
+#include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 #include <errno.h>
 
-unsigned int 
-if_nametoindex(const char *name)
+/*
+ * From RFC 2553:
+ *
+ * 4.1 Name-to-Index
+ *
+ *
+ *    The first function maps an interface name into its corresponding
+ *    index.
+ *
+ *       #include <net/if.h>
+ *
+ *       unsigned int  if_nametoindex(const char *ifname);
+ *
+ *    If the specified interface name does not exist, the return value is
+ *    0, and errno is set to ENXIO.  If there was a system error (such as
+ *    running out of memory), the return value is 0 and errno is set to the
+ *    proper value (e.g., ENOMEM).
+ */
+
+unsigned int
+if_nametoindex(const char *ifname)
 {
-        int     i, fd = -1, extra, len = 0;
-        struct ifconf ifconf;
-        char    lastname[IFNAMSIZ], *thisname, *inbuf;
-        unsigned int index = 0;
-        struct sockaddr *sa;
-        void    *p;
+        struct ifaddrs *ifaddrs, *ifa;
+        unsigned int ni;
 
-        ifconf.ifc_buf = 0;
+        if (getifaddrs(&ifaddrs) < 0)
+                return(0);
 
-        if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
-                goto ret;
+        ni = 0;
 
-        /*
-         * Try ifc_len == 0 hack first, to get the actual length.
-         * If that fails, revert to a loop which grows the ifc_buf
-         * until it is sufficiently large.
-         */
-        extra = sizeof(struct ifreq);
-        while (1) {
-                ifconf.ifc_len = len;
-                if (ioctl(fd, SIOCGIFCONF, (void *) &ifconf) == -1 &&
-                    ifconf.ifc_buf)
-                        goto ret;
-                if (ifconf.ifc_buf &&
-                    ifconf.ifc_len + extra < len)
+        for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
+                if (ifa->ifa_addr &&
+                    ifa->ifa_addr->sa_family == AF_LINK &&
+                    strcmp(ifa->ifa_name, ifname) == 0) {
+                        ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index;
                         break;
-                if (ifconf.ifc_buf) {
-                        if (len == 0)
-                                len = 4096;
-                        ifconf.ifc_len = len *= 2;
-                } else {
-                        len = ifconf.ifc_len;
-                        extra = 0;
-                }
-                inbuf = realloc(ifconf.ifc_buf, ifconf.ifc_len);
-                if (inbuf == NULL)
-                        goto ret;
-                ifconf.ifc_buf = inbuf;
-        }
-
-        i = 0;
-        p = ifconf.ifc_buf;
-        len = ifconf.ifc_len;
-        lastname[0] = 0;
-        lastname[sizeof(lastname)-1] = 0;
-
-        while (len > 0) {
-                if (len < IFNAMSIZ + sizeof(struct sockaddr))
-                        goto ret;
-
-                thisname = p;
-                if (strncmp(lastname, p, IFNAMSIZ)) {
-                        if (!strcmp(lastname, name)) {
-                                index = i;
-                                goto ret;
-                        }
-                        memcpy(lastname, thisname, IFNAMSIZ);
-                        i++;
                 }
-
-                len -= IFNAMSIZ;
-                p += IFNAMSIZ;
-                sa = (struct sockaddr *)p;
-
-                if (!strncmp(thisname, name, IFNAMSIZ) &&
-                    sa->sa_family == AF_LINK) {
-                        struct sockaddr_dl *sd = p;
-
-                        index = sd->sdl_index;
-                        goto ret;
-                }
-
-                if (len < sa->sa_len)
-                        goto ret;
-                len -= sa->sa_len;
-                p += sa->sa_len;
         }
 
-        if (!strcmp(lastname, name))
-                index = i;
-
-ret:
-        if (fd != -1)
-                close(fd);
-        if (ifconf.ifc_buf)
-                free(ifconf.ifc_buf);
-        return index;
+        freeifaddrs(ifaddrs);
+        if (!ni)
+                errno = ENXIO;
+        return(ni);
 }