1 files changed, 181 insertions, 0 deletions

diff --git a/src/lib/libc/net/if_indextoname.c b/src/lib/libc/net/if_indextoname.c
new file mode 100644
index 0000000000..ff7fcada91
--- /dev/null
+++ b/src/lib/libc/net/if_indextoname.c
@@ -0,0 +1,181 @@
+/*
+ * %%% copyright-cmetz-98-bsd
+ * Copyright (c) 1998-1999, Craig Metz, 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
+ * 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
+ * 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)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * 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.
+ *
+ * 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
+ * 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
+ * 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)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * 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.
+ *
+ * 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
+ * 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
+ * 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)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * 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.
+ */
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#ifdef AF_LINK
+#include <net/if_dl.h>
+#endif /* AF_LINK */
+#include <errno.h>
+
+static char __name[IFNAMSIZ + 1];
+
+char *if_indextoname(unsigned int index, char *name)
+{
+  int i, fd;
+#ifdef SIOCGIFNAME
+  struct ifreq ifreq;
+#else /* SIOCGIFNAME */
+  struct ifconf ifconf;
+  void *p;
+  int len;
+  char lastname[IFNAMSIZ + 1];
+  char iname[IFNAMSIZ + 1];
+  char *retname = NULL;
+#endif /* SIOCGIFNAME */
+
+  if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
+    return 0;
+
+  if (!name)
+    name = __name;
+
+#ifdef SIOCGIFNAME
+  ifreq.ifr_ifindex = index;
+  i = ioctl(fd, SIOCGIFNAME, &ifreq);
+  close(fd);
+  if (i)
+    return NULL;
+
+  strcpy(name, ifreq.ifr_name);
+  return name;
+#else /* SIOCGIFNAME */
+  if (__siocgifconf(fd, &ifconf)) {
+    close(fd);
+    return NULL;
+  };
+
+  i = 0;
+  p = ifconf.ifc_buf;
+  len = ifconf.ifc_len;
+  lastname[0] = 0;
+  lastname[IFNAMSIZ] = 0;
+  iname[0] = 0;
+
+  while(len > 0) {
+    if (len < (IFNAMSIZ + sizeof(struct sockaddr)))
+      goto ret;
+    if (strncmp(lastname, p, IFNAMSIZ)) {
+      if (i == index)
+        strcpy(iname, lastname);
+      memcpy(lastname, p, IFNAMSIZ);
+      i++;
+    };
+    len -= IFNAMSIZ;
+    p += IFNAMSIZ;
+
+#ifdef AF_LINK
+    if (((struct sockaddr *)p)->sa_family == AF_LINK)
+      if (((struct sockaddr_dl *)p)->sdl_index == index) {
+        strcpy(retname = name, lastname);
+        goto ret;
+      };
+#endif /* AF_LINK */
+
+    if (len < SA_LEN((struct sockaddr *)p))
+      goto ret;
+    len -= SA_LEN((struct sockaddr *)p);
+    p += SA_LEN((struct sockaddr *)p);
+  };
+
+  if (i == index)
+    strcpy(iname, lastname);
+
+  if (iname[0])
+    strcpy(retname = name, iname);
+
+ret:
+  close(fd);
+  free(ifconf.ifc_buf);
+  return retname;
+#endif /* SIOCGIFNAME */
+};