auto import from //depot/cupcake/@135843
diff --git a/toolbox/ifconfig.c b/toolbox/ifconfig.c
new file mode 100644
index 0000000..e83cd8b
--- /dev/null
+++ b/toolbox/ifconfig.c
@@ -0,0 +1,139 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <linux/if.h>
+#include <linux/sockios.h>
+#include <arpa/inet.h>
+
+static void die(const char *s)
+{
+ fprintf(stderr,"error: %s (%s)\n", s, strerror(errno));
+ exit(-1);
+}
+
+static void setflags(int s, struct ifreq *ifr, int set, int clr)
+{
+ if(ioctl(s, SIOCGIFFLAGS, ifr) < 0) die("SIOCGIFFLAGS");
+ ifr->ifr_flags = (ifr->ifr_flags & (~clr)) | set;
+ if(ioctl(s, SIOCSIFFLAGS, ifr) < 0) die("SIOCSIFFLAGS");
+}
+
+static inline void init_sockaddr_in(struct sockaddr_in *sin, const char *addr)
+{
+ sin->sin_family = AF_INET;
+ sin->sin_port = 0;
+ sin->sin_addr.s_addr = inet_addr(addr);
+}
+
+static void setnetmask(int s, struct ifreq *ifr, const char *addr)
+{
+ init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_netmask, addr);
+ if(ioctl(s, SIOCSIFNETMASK, ifr) < 0) die("SIOCSIFNETMASK");
+}
+
+static void setaddr(int s, struct ifreq *ifr, const char *addr)
+{
+ init_sockaddr_in((struct sockaddr_in *) &ifr->ifr_addr, addr);
+ if(ioctl(s, SIOCSIFADDR, ifr) < 0) die("SIOCSIFADDR");
+}
+
+int ifconfig_main(int argc, char *argv[])
+{
+ struct ifreq ifr;
+ int s;
+ unsigned int addr, mask, flags;
+ char astring[20];
+ char mstring[20];
+ char *updown, *brdcst, *loopbk, *ppp, *running, *multi;
+
+ argc--;
+ argv++;
+
+ if(argc == 0) return 0;
+
+ memset(&ifr, 0, sizeof(struct ifreq));
+ strncpy(ifr.ifr_name, argv[0], IFNAMSIZ);
+ ifr.ifr_name[IFNAMSIZ-1] = 0;
+ argc--, argv++;
+
+ if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+ die("cannot open control socket\n");
+ }
+
+ if (argc == 0) {
+ if (ioctl(s, SIOCGIFADDR, &ifr) < 0) {
+ perror(ifr.ifr_name);
+ return -1;
+ } else
+ addr = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
+
+ if (ioctl(s, SIOCGIFNETMASK, &ifr) < 0) {
+ perror(ifr.ifr_name);
+ return -1;
+ } else
+ mask = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
+
+ if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
+ perror(ifr.ifr_name);
+ return -1;
+ } else
+ flags = ifr.ifr_flags;
+
+ sprintf(astring, "%d.%d.%d.%d",
+ addr & 0xff,
+ ((addr >> 8) & 0xff),
+ ((addr >> 16) & 0xff),
+ ((addr >> 24) & 0xff));
+ sprintf(mstring, "%d.%d.%d.%d",
+ mask & 0xff,
+ ((mask >> 8) & 0xff),
+ ((mask >> 16) & 0xff),
+ ((mask >> 24) & 0xff));
+ printf("%s: ip %s mask %s flags [", ifr.ifr_name,
+ astring,
+ mstring
+ );
+
+ updown = (flags & IFF_UP) ? "up" : "down";
+ brdcst = (flags & IFF_BROADCAST) ? " broadcast" : "";
+ loopbk = (flags & IFF_LOOPBACK) ? " loopback" : "";
+ ppp = (flags & IFF_POINTOPOINT) ? " point-to-point" : "";
+ running = (flags & IFF_RUNNING) ? " running" : "";
+ multi = (flags & IFF_MULTICAST) ? " multicast" : "";
+ printf("%s%s%s%s%s%s]\n", updown, brdcst, loopbk, ppp, running, multi);
+
+
+
+/* char *updown, *brdcst, *loopbk, *ppp, *running, *multi; */
+
+ return 0;
+ }
+
+ while(argc > 0){
+ if(!strcmp(argv[0], "up")) {
+ setflags(s, &ifr, IFF_UP, 0);
+ } else if(!strcmp(argv[0], "down")) {
+ setflags(s, &ifr, 0, IFF_UP);
+ } else if(!strcmp(argv[0], "netmask")) {
+ argc--, argv++;
+ if (0 == argc) {
+ errno = EINVAL;
+ die("expecting an IP address for parameter \"netmask\"");
+ }
+ setnetmask(s, &ifr, argv[0]);
+ } else if(isdigit(argv[0][0])){
+ setaddr(s, &ifr, argv[0]);
+ }
+ argc--, argv++;
+ }
+
+ return 0;
+}