auto import from //depot/cupcake/@135843
diff --git a/netcfg/netcfg.c b/netcfg/netcfg.c
new file mode 100644
index 0000000..fc9cf48
--- /dev/null
+++ b/netcfg/netcfg.c
@@ -0,0 +1,175 @@
+/* system/bin/netcfg/netcfg.c
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+** http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <dirent.h>
+
+static int verbose = 0;
+
+int ifc_init();
+void ifc_close();
+int ifc_up(char *iname);
+int ifc_down(char *iname);
+int ifc_remove_host_routes(char *iname);
+int ifc_remove_default_route(char *iname);
+int ifc_get_info(const char *name, unsigned *addr, unsigned *mask, unsigned *flags);
+int do_dhcp(char *iname);
+
+void die(const char *reason)
+{
+ perror(reason);
+ exit(1);
+}
+
+const char *ipaddr(unsigned addr)
+{
+ static char buf[32];
+
+ sprintf(buf,"%d.%d.%d.%d",
+ addr & 255,
+ ((addr >> 8) & 255),
+ ((addr >> 16) & 255),
+ (addr >> 24));
+ return buf;
+}
+
+void usage(void)
+{
+ fprintf(stderr,"usage: netcfg [<interface> {dhcp|up|down}]\n");
+ exit(1);
+}
+
+int dump_interface(const char *name)
+{
+ unsigned addr, mask, flags;
+
+ if(ifc_get_info(name, &addr, &mask, &flags)) {
+ return 0;
+ }
+
+ printf("%-8s %s ", name, flags & 1 ? "UP " : "DOWN");
+ printf("%-16s", ipaddr(addr));
+ printf("%-16s", ipaddr(mask));
+ printf("0x%08x\n", flags);
+ return 0;
+}
+
+int dump_interfaces(void)
+{
+ DIR *d;
+ struct dirent *de;
+
+ d = opendir("/sys/class/net");
+ if(d == 0) return -1;
+
+ while((de = readdir(d))) {
+ if(de->d_name[0] == '.') continue;
+ dump_interface(de->d_name);
+ }
+ closedir(d);
+ return 0;
+}
+
+struct
+{
+ const char *name;
+ int nargs;
+ void *func;
+} CMDS[] = {
+ { "dhcp", 1, do_dhcp },
+ { "up", 1, ifc_up },
+ { "down", 1, ifc_down },
+ { "flhosts", 1, ifc_remove_host_routes },
+ { "deldefault", 1, ifc_remove_default_route },
+ { 0, 0, 0 },
+};
+
+static int call_func(void *_func, unsigned nargs, char **args)
+{
+ switch(nargs){
+ case 1: {
+ int (*func)(char *a0) = _func;
+ return func(args[0]);
+ }
+ case 2: {
+ int (*func)(char *a0, char *a1) = _func;
+ return func(args[0], args[1]);
+ }
+ case 3: {
+ int (*func)(char *a0, char *a1, char *a2) = _func;
+ return func(args[0], args[1], args[2]);
+ }
+ default:
+ return -1;
+ }
+}
+
+int main(int argc, char **argv)
+{
+ char *iname;
+ int n;
+
+ if(ifc_init()) {
+ die("Cannot perform requested operation");
+ }
+
+ if(argc == 1) {
+ int result = dump_interfaces();
+ ifc_close();
+ return result;
+ }
+
+ if(argc < 3) usage();
+
+ iname = argv[1];
+ if(strlen(iname) > 16) usage();
+
+ argc -= 2;
+ argv += 2;
+ while(argc > 0) {
+ for(n = 0; CMDS[n].name; n++){
+ if(!strcmp(argv[0], CMDS[n].name)) {
+ char *cmdname = argv[0];
+ int nargs = CMDS[n].nargs;
+
+ argv[0] = iname;
+ if(argc < nargs) {
+ fprintf(stderr, "not enough arguments for '%s'\n", cmdname);
+ ifc_close();
+ exit(1);
+ }
+ if(call_func(CMDS[n].func, nargs, argv)) {
+ fprintf(stderr, "action '%s' failed (%s)\n", cmdname, strerror(errno));
+ ifc_close();
+ exit(1);
+ }
+ argc -= nargs;
+ argv += nargs;
+ goto done;
+ }
+ }
+ fprintf(stderr,"no such action '%s'\n", argv[0]);
+ usage();
+ done:
+ ;
+ }
+ ifc_close();
+
+ return 0;
+}