changeset 1132:615505bb38b6

Promote ifconfig from pending to other.
author Rob Landley <rob@landley.net>
date Thu, 28 Nov 2013 22:13:04 -0600
parents f9678ea553c8
children f8c926309a21
files toys/other/ifconfig.c toys/pending/ifconfig.c
diffstat 2 files changed, 505 insertions(+), 505 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toys/other/ifconfig.c	Thu Nov 28 22:13:04 2013 -0600
@@ -0,0 +1,505 @@
+/* ifconfig.c - Configure network interface.
+ *
+ * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
+ * Copyright 2012 Kyungwan Han <asura321@gamil.com>
+ * Reviewed by Kyungsu Kim <kaspyx@gmail.com>
+ *
+ * Not in SUSv4.
+
+USE_IFCONFIG(NEWTOY(ifconfig, "?a", TOYFLAG_BIN))
+
+config IFCONFIG
+  bool "ifconfig"
+  default y
+  help
+    usage: ifconfig [-a] interface [address]
+
+    Configure network interface.
+
+    [add ADDRESS[/PREFIXLEN]]
+    [del ADDRESS[/PREFIXLEN]]
+    [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]
+    [netmask ADDRESS] [dstaddr ADDRESS]
+    [outfill NN] [keepalive NN]
+    [hw ether|infiniband ADDRESS] [metric NN] [mtu NN]
+    [[-]trailers] [[-]arp] [[-]allmulti]
+    [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]
+    [mem_start NN] [io_addr NN] [irq NN]
+    [up|down] ...    
+*/
+
+#define FOR_ifconfig
+#include "toys.h"
+
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+
+GLOBALS(
+  int sockfd;
+)
+
+//for ipv6 add/del
+struct ifreq_inet6 {
+  struct in6_addr ifrinte6_addr;
+  uint32_t ifrinet6_prefixlen;
+  int ifrinet6_ifindex;
+};
+
+// Convert hostname to binary address for AF_INET or AF_INET6
+void get_addrinfo(char *host, sa_family_t af, void *addr)
+{
+  struct addrinfo hints, *result, *rp = 0;
+  int status, len;
+  char *from;
+
+  memset(&hints, 0 , sizeof(struct addrinfo));
+  hints.ai_family = af;
+  hints.ai_socktype = SOCK_STREAM;
+
+  status = getaddrinfo(host, NULL, &hints, &result);
+  if (!status)
+    for (rp = result; rp; rp = rp->ai_next)
+      if (rp->ai_family == af) break;
+  if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status));
+
+  // You'd think ipv4 and ipv6 would ahve some basic compatability, but no.
+  len = 4;
+  from = ((char *)rp->ai_addr->sa_data) + 2;
+  if (af == AF_INET6) {
+    len = 16;
+    from += 4;
+  }
+  memcpy(addr, from, len);
+  freeaddrinfo(result);
+}
+
+static void display_ifconfig(char *name, int always, unsigned long long val[])
+{
+  struct ifreq ifre;
+  struct {
+    int type;
+    char *title;
+  } types[] = {
+    {ARPHRD_LOOPBACK, "Local Loopback"}, {ARPHRD_ETHER, "Ethernet"},
+    {ARPHRD_PPP, "Point-to-Point Protocol"}, {ARPHRD_INFINIBAND, "InfiniBand"},
+    {ARPHRD_SIT, "IPv6-in-IPv4"}, {-1, "UNSPEC"}
+  };
+  int i;
+  char *pp;
+  FILE *fp;
+  short flags;
+
+  xstrncpy(ifre.ifr_name, name, IFNAMSIZ);
+  if (ioctl(TT.sockfd, SIOCGIFFLAGS, &ifre)<0) perror_exit("%s", name);
+  flags = ifre.ifr_flags;
+  if (!always && !(flags & IFF_UP)) return;
+
+  // query hardware type and hardware address
+  i = ioctl(TT.sockfd, SIOCGIFHWADDR, &ifre);
+
+  for (i=0; i < (sizeof(types)/sizeof(*types))-1; i++)
+    if (ifre.ifr_hwaddr.sa_family == types[i].type) break;
+
+  xprintf("%-9s Link encap:%s  ", name, types[i].title);
+  if(i >= 0 && ifre.ifr_hwaddr.sa_family == ARPHRD_ETHER) {
+    xprintf("HWaddr ");
+    for (i=0; i<6; i++) xprintf(":%02X"+!i, ifre.ifr_hwaddr.sa_data[i]);
+  }
+  xputc('\n');
+
+  // If an address is assigned record that.
+
+  ifre.ifr_addr.sa_family = AF_INET;
+  memset(&ifre.ifr_addr, 0, sizeof(ifre.ifr_addr));
+  ioctl(TT.sockfd, SIOCGIFADDR, &ifre);
+  pp = (char *)&ifre.ifr_addr;
+  for (i = 0; i<sizeof(ifre.ifr_addr); i++) if (pp[i]) break;
+
+  if (i != sizeof(ifre.ifr_addr)) {
+    struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
+    struct {
+      char *name;
+      int flag, ioctl;
+    } addr[] = {
+      {"addr", 0, 0},
+      {"P-t-P", IFF_POINTOPOINT, SIOCGIFDSTADDR},
+      {"Bcast", IFF_BROADCAST, SIOCGIFBRDADDR},
+      {"Mask", 0, SIOCGIFNETMASK}
+    };
+
+    xprintf("%10c%s", ' ', (si->sin_family == AF_INET) ? "inet" :
+        (si->sin_family == AF_INET6) ? "inet6" : "unspec");
+
+    for (i=0; i < sizeof(addr)/sizeof(*addr); i++) {
+      if (!addr[i].flag || (flags & addr[i].flag)) {
+        if (addr[i].ioctl && ioctl(TT.sockfd, addr[i].ioctl, &ifre))
+          si->sin_family = 0;
+        xprintf(" %s:%s ", addr[i].name,
+          (si->sin_family == 0xFFFF || !si->sin_family)
+            ? "[NOT SET]" : inet_ntoa(si->sin_addr));
+      }
+    }
+
+    xputc('\n');
+  }
+
+  fp = fopen(pp = "/proc/net/if_inet6", "r");
+  if (fp) {
+    char iface_name[IFNAMSIZ];
+    int plen, iscope;
+
+    while (fgets(toybuf, sizeof(toybuf), fp)) {
+      int nitems;
+      char ipv6_addr[40];
+
+      nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n",
+                      ipv6_addr, &plen, &iscope, iface_name);
+      if (nitems<0 && feof(fp)) break;
+      if (nitems != 4) perror_exit("bad %s", pp);
+
+      if (!strcmp(name, iface_name)) {
+        struct sockaddr_in6 s6;
+        char *ptr = ipv6_addr+sizeof(ipv6_addr)-1;
+
+        // convert giant hex string into colon-spearated ipv6 address by
+        // inserting ':' every 4 characters. 
+        for (i = 32; i; i--)
+          if ((*(ptr--) = ipv6_addr[i])) if (!(i&3)) *(ptr--) = ':';
+
+        // Convert to binary and back to get abbreviated :: version
+        if (inet_pton(AF_INET6, ipv6_addr, (void *)&s6.sin6_addr) > 0) {
+          if (inet_ntop(AF_INET6, &s6.sin6_addr, toybuf, sizeof(toybuf))) {
+            char *scopes[] = {"Global","Host","Link","Site","Compat"},
+                 *scope = "Unknown";
+
+            for (i=0; i < sizeof(scopes)/sizeof(*scopes); i++)
+              if (iscope == (!!i)<<(i+3)) scope = scopes[i];
+            xprintf("%10cinet6 addr: %s/%d Scope: %s\n",
+                    ' ', toybuf, plen, scope);
+          }
+        }
+      }
+    }
+    fclose(fp);
+  }
+
+  xprintf("%10c", ' ');
+
+  if (flags) {
+    unsigned short mask = 1;
+    char **s, *str[] = {
+      "UP", "BROADCAST", "DEBUG", "LOOPBACK", "POINTOPOINT", "NOTRAILERS",
+      "RUNNING", "NOARP", "PROMISC", "ALLMULTI", "MASTER", "SLAVE", "MULTICAST",
+      "PORTSEL", "AUTOMEDIA", "DYNAMIC", NULL
+    };
+
+    for (s = str; *s; s++) {
+      if (flags & mask) xprintf("%s ", *s);
+      mask = mask << 1;
+    }
+  } else xprintf("[NO FLAGS] ");
+
+  if (ioctl(TT.sockfd, SIOCGIFMTU, &ifre) < 0) ifre.ifr_mtu = 0;
+  xprintf(" MTU:%d", ifre.ifr_mtu);
+  if (ioctl(TT.sockfd, SIOCGIFMETRIC, &ifre) < 0) ifre.ifr_metric = 0;
+  if (!ifre.ifr_metric) ifre.ifr_metric = 1;
+  xprintf("  Metric:%d", ifre.ifr_metric);
+
+  // non-virtual interface
+
+  if (val) {
+    char *label[] = {"RX bytes", "RX packets", "errors", "dropped", "overruns",
+      "frame", 0, 0, "TX bytes", "TX packets", "errors", "dropped", "overruns",
+      "collisions", "carrier", 0, "txqueuelen"};
+    signed char order[] = {-1, 1, 2, 3, 4, 5, -1, 9, 10, 11, 12, 14, -1,
+      13, 16, -1, 0, 8};
+    int i;
+
+    // Query txqueuelen
+    if (ioctl(TT.sockfd, SIOCGIFTXQLEN, &ifre) >= 0) val[16] = ifre.ifr_qlen;
+    else val[16] = -1;
+
+    for (i = 0; i < sizeof(order); i++) {
+      int j = order[i];
+
+      if (j < 0) xprintf("\n%10c", ' ');
+      else xprintf("%s:%llu ", label[j], val[j]);
+    }
+  }
+  xputc('\n');
+
+  if(!ioctl(TT.sockfd, SIOCGIFMAP, &ifre) && (ifre.ifr_map.irq ||
+      ifre.ifr_map.mem_start || ifre.ifr_map.dma || ifre.ifr_map.base_addr))
+  {
+    xprintf("%10c", ' ');
+    if(ifre.ifr_map.irq) xprintf("Interrupt:%d ", ifre.ifr_map.irq);
+    if(ifre.ifr_map.base_addr >= 0x100) // IO_MAP_INDEX
+      xprintf("Base address:0x%lx ", ifre.ifr_map.base_addr);
+    if(ifre.ifr_map.mem_start)
+      xprintf("Memory:%lx-%lx ", ifre.ifr_map.mem_start, ifre.ifr_map.mem_end);
+    if(ifre.ifr_map.dma) xprintf("DMA chan:%x ", ifre.ifr_map.dma);
+    xputc('\n');
+  }
+  xputc('\n');
+}
+
+static void show_iface(char *iface_name)
+{
+  char *name;
+  struct string_list *ifaces = 0, *sl;
+  int i, j;
+  FILE *fp;
+
+  fp = xfopen("/proc/net/dev", "r");
+
+  for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) {
+    char *buf = toybuf;
+    unsigned long long val[17];
+
+    if (i<2) continue;
+
+    while (isspace(*buf)) buf++;
+    name = strsep(&buf, ":");
+    if(!buf) error_exit("bad name %s", name);
+
+    errno = 0;
+    for (j=0; j<16 && !errno; j++) val[j] = strtoll(buf, &buf, 0);
+    if (errno) perror_exit("bad %s at %s", name, buf);
+
+    if (iface_name) {
+      if (!strcmp(iface_name, name)) {
+        display_ifconfig(iface_name, 1, val);
+
+        return;
+      }
+    } else {
+      sl = xmalloc(sizeof(*sl)+strlen(name)+1);
+      strcpy(sl->str, name);
+      sl->next = ifaces;
+      ifaces = sl;
+
+      display_ifconfig(sl->str, toys.optflags & FLAG_a, val);
+    }
+  }
+  fclose(fp);
+
+  if (iface_name) display_ifconfig(iface_name, 1, 0);
+  else {
+    struct ifconf ifcon;
+    struct ifreq *ifre;
+    int num;
+
+    // Loop until buffer's big enough
+    ifcon.ifc_buf = NULL;
+    for (num = 30;;num += 10) {
+      ifcon.ifc_len = sizeof(struct ifreq)*num;
+      ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len);
+      xioctl(TT.sockfd, SIOCGIFCONF, &ifcon);
+      if (ifcon.ifc_len != sizeof(struct ifreq)*num) break;
+    }
+
+    ifre = ifcon.ifc_req;
+    for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++)
+    {
+      // Skip duplicates
+      for(sl = ifaces; sl; sl = sl->next)
+        if(!strcmp(sl->str, ifre->ifr_name)) break;
+
+      if(!sl) display_ifconfig(ifre->ifr_name, toys.optflags & FLAG_a, 0);
+    }
+
+    free(ifcon.ifc_buf);
+  }
+
+  llist_traverse(ifaces, free);
+}
+
+// Encode offset and size of field into an int, and make result negative
+#define IFREQ_OFFSZ(x) -(int)((offsetof(struct ifreq, x)<<16) + sizeof(ifre.x))
+
+void ifconfig_main(void)
+{
+  char **argv = toys.optargs;
+  struct ifreq ifre;
+  int i;
+
+  TT.sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
+  if(toys.optc < 2) {
+    show_iface(*argv);
+    return;
+  }
+
+  // Open interface
+  memset(&ifre, 0, sizeof(struct ifreq));
+  xstrncpy(ifre.ifr_name, *argv, IFNAMSIZ);
+
+  // Perform operations on interface
+  while(*++argv) {
+    // Table of known operations
+    struct argh {
+      char *name;
+      int on, off; // set, clear
+    } try[] = {
+      {0, IFF_UP|IFF_RUNNING, SIOCSIFADDR},
+      {"up", IFF_UP|IFF_RUNNING, 0},
+      {"down", 0, IFF_UP},
+      {"arp", 0, IFF_NOARP},
+      {"trailers", 0, IFF_NOTRAILERS},
+      {"promisc", IFF_PROMISC, 0},
+      {"allmulti", IFF_ALLMULTI, 0},
+      {"multicast", IFF_MULTICAST, 0},
+      {"dynamic", IFF_DYNAMIC, 0},
+      {"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR},
+      {"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR},
+      {"netmask", 0, SIOCSIFNETMASK},
+      {"dstaddr", 0, SIOCSIFDSTADDR},
+      {"mtu", IFREQ_OFFSZ(ifr_mtu), SIOCSIFMTU},
+      {"keepalive", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE}, // SIOCSKEEPALIVE
+      {"outfill", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE+2}, // SIOCSOUTFILL
+      {"metric", IFREQ_OFFSZ(ifr_metric), SIOCSIFMETRIC},
+      {"txqueuelen", IFREQ_OFFSZ(ifr_qlen), SIOCSIFTXQLEN},
+      {"mem_start", IFREQ_OFFSZ(ifr_map.mem_start), SIOCSIFMAP},
+      {"io_addr", IFREQ_OFFSZ(ifr_map.base_addr), SIOCSIFMAP},
+      {"irq", IFREQ_OFFSZ(ifr_map.irq), SIOCSIFMAP},
+      {"inet", 0, 0},
+      {"inet6", 0, 0}
+    };
+    char *s = *argv;
+    int rev = (*s == '-');
+
+    s += rev;
+
+    // "set hardware address" is oddball enough to special case
+    if (!strcmp(*argv, "hw")) {
+      char *hw_addr, *ptr, *p;
+      struct sockaddr *sock = &ifre.ifr_hwaddr;
+      int count = 6;
+
+      ptr = p = (char *)sock->sa_data;
+      memset(sock, 0, sizeof(struct sockaddr));
+      if (!argv[1]) {
+        if (!strcmp("ether", *++argv)) sock->sa_family = ARPHRD_ETHER;
+        else if (!strcmp("infiniband", *argv)) {
+          sock->sa_family = ARPHRD_INFINIBAND;
+          count = 20;
+          p = ptr = toybuf;
+        }
+      }
+      if (!sock->sa_family || !argv[1]) {
+        toys.exithelp++;
+        error_exit("bad hw '%s'", *argv);
+      }
+      hw_addr = *++argv;
+
+      // Parse and verify address.
+      while (*hw_addr && (p-ptr) < count) {
+        int val, len = 0;
+
+        if (*hw_addr == ':') hw_addr++;
+        sscanf(hw_addr, "%2x%n", &val, &len);
+        if (len != 2) break;
+        hw_addr += len;
+        *p++ = val;
+      }
+
+      if ((p-ptr) != count || *hw_addr)
+        error_exit("bad hw-addr '%s'", hw_addr ? hw_addr : "");
+
+      // the linux kernel's "struct sockaddr" (include/linux/socket.h in the
+      // kernel source) only has 14 bytes of sa_data, and an infiniband address
+      // is 20. So if we go through the ioctl, the kernel will truncate
+      // infiniband addresses, meaning we have to go through sysfs instead.
+      if (sock->sa_family == ARPHRD_INFINIBAND && !strchr(ifre.ifr_name, '/')) {
+        int fd;
+
+        sprintf(toybuf, "/sys/class/net/%s/address", ifre.ifr_name);
+        fd = xopen(toybuf, O_RDWR);
+        xwrite(fd, *argv, strlen(*argv));
+        close(fd);
+      } else xioctl(TT.sockfd, SIOCSIFHWADDR, &ifre);
+      continue;
+
+    // Add/remove ipv6 address to interface
+
+    } else if (!strcmp(*argv, "add") || !strcmp(*argv, "del")) {
+      struct ifreq_inet6 {
+        struct in6_addr addr;
+        unsigned prefix;
+        int index;
+      } ifre6;
+      int plen = 128, fd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
+      char *prefix;
+
+      if (!argv[1]) {
+        toys.exithelp++;
+        error_exit(*argv);
+      }
+
+      prefix = strchr(argv[1], '/');
+      if (prefix) {
+        plen = atolx_range(prefix+1, 0, 128);
+        *prefix = 0;
+      }
+
+      get_addrinfo(argv[1], AF_INET6, &ifre6.addr);
+      xioctl(fd6, SIOCGIFINDEX, &ifre);
+      ifre6.index = ifre.ifr_ifindex;
+      ifre6.prefix = plen;
+      xioctl(fd6, **(argv++)=='a' ? SIOCSIFADDR : SIOCDIFADDR, &ifre6);
+
+      close(fd6);
+      continue;
+    // Iterate through table to find/perform operation
+    } else for (i = 0; i < sizeof(try)/sizeof(*try); i++) {
+      struct argh *t = try+i;
+      int on = t->on, off = t->off;
+
+      if (!t->name) {
+        if (isdigit(**argv) || !strcmp(*argv, "default")) argv--;
+        else continue;
+      } else if (strcmp(t->name, s)) continue;
+
+      // Is this an SIOCSI entry?
+      if ((off|0xff) == 0x89ff) {
+        if (!rev) {
+          if (!*++argv) show_help();
+
+          // Assign value to ifre field and call ioctl? (via IFREQ_OFFSZ.)
+          if (on < 0) {
+            long l = strtoul(*argv, 0, 0);
+
+            if (off == SIOCSIFMAP) xioctl(TT.sockfd, SIOCGIFMAP, &ifre);
+            on = -on;
+            poke((on>>16) + (char *)&ifre, l, on&15);
+            xioctl(TT.sockfd, off, &ifre);
+            break;
+          } else if (t->name || !strchr(ifre.ifr_name, ':')) {
+            struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
+
+            si->sin_family = AF_INET;
+
+            if (!strcmp(*argv, "default")) si->sin_addr.s_addr = INADDR_ANY;
+            else get_addrinfo(*argv, AF_INET, &si->sin_addr);
+            xioctl(TT.sockfd, off, &ifre);
+          }
+        }
+        off = 0;
+      }
+
+      // Set flags
+      if (on || off) {
+        xioctl(TT.sockfd, SIOCGIFFLAGS, &ifre);
+        ifre.ifr_flags &= ~(rev ? on : off);
+        ifre.ifr_flags |= (rev ? off : on);
+        xioctl(TT.sockfd, SIOCSIFFLAGS, &ifre);
+      }
+
+      break;
+    }
+    if (i == sizeof(try)/sizeof(*try)) {
+      toys.exithelp++;
+      error_exit("bad argument '%s'", *argv);
+    }
+  }
+  close(TT.sockfd);
+}
--- a/toys/pending/ifconfig.c	Thu Nov 28 21:11:34 2013 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,505 +0,0 @@
-/* ifconfig.c - Configure network interface.
- *
- * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
- * Copyright 2012 Kyungwan Han <asura321@gamil.com>
- * Reviewed by Kyungsu Kim <kaspyx@gmail.com>
- *
- * Not in SUSv4.
-
-USE_IFCONFIG(NEWTOY(ifconfig, "?a", TOYFLAG_BIN))
-
-config IFCONFIG
-  bool "ifconfig"
-  default y
-  help
-    usage: ifconfig [-a] interface [address]
-
-    Configure network interface.
-
-    [add ADDRESS[/PREFIXLEN]]
-    [del ADDRESS[/PREFIXLEN]]
-    [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]
-    [netmask ADDRESS] [dstaddr ADDRESS]
-    [outfill NN] [keepalive NN]
-    [hw ether|infiniband ADDRESS] [metric NN] [mtu NN]
-    [[-]trailers] [[-]arp] [[-]allmulti]
-    [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]
-    [mem_start NN] [io_addr NN] [irq NN]
-    [up|down] ...    
-*/
-
-#define FOR_ifconfig
-#include "toys.h"
-
-#include <net/if_arp.h>
-#include <net/ethernet.h>
-
-GLOBALS(
-  int sockfd;
-)
-
-//for ipv6 add/del
-struct ifreq_inet6 {
-  struct in6_addr ifrinte6_addr;
-  uint32_t ifrinet6_prefixlen;
-  int ifrinet6_ifindex;
-};
-
-// Convert hostname to binary address for AF_INET or AF_INET6
-void get_addrinfo(char *host, sa_family_t af, void *addr)
-{
-  struct addrinfo hints, *result, *rp = 0;
-  int status, len;
-  char *from;
-
-  memset(&hints, 0 , sizeof(struct addrinfo));
-  hints.ai_family = af;
-  hints.ai_socktype = SOCK_STREAM;
-
-  status = getaddrinfo(host, NULL, &hints, &result);
-  if (!status)
-    for (rp = result; rp; rp = rp->ai_next)
-      if (rp->ai_family == af) break;
-  if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status));
-
-  // You'd think ipv4 and ipv6 would ahve some basic compatability, but no.
-  len = 4;
-  from = ((char *)rp->ai_addr->sa_data) + 2;
-  if (af == AF_INET6) {
-    len = 16;
-    from += 4;
-  }
-  memcpy(addr, from, len);
-  freeaddrinfo(result);
-}
-
-static void display_ifconfig(char *name, int always, unsigned long long val[])
-{
-  struct ifreq ifre;
-  struct {
-    int type;
-    char *title;
-  } types[] = {
-    {ARPHRD_LOOPBACK, "Local Loopback"}, {ARPHRD_ETHER, "Ethernet"},
-    {ARPHRD_PPP, "Point-to-Point Protocol"}, {ARPHRD_INFINIBAND, "InfiniBand"},
-    {ARPHRD_SIT, "IPv6-in-IPv4"}, {-1, "UNSPEC"}
-  };
-  int i;
-  char *pp;
-  FILE *fp;
-  short flags;
-
-  xstrncpy(ifre.ifr_name, name, IFNAMSIZ);
-  if (ioctl(TT.sockfd, SIOCGIFFLAGS, &ifre)<0) perror_exit("%s", name);
-  flags = ifre.ifr_flags;
-  if (!always && !(flags & IFF_UP)) return;
-
-  // query hardware type and hardware address
-  i = ioctl(TT.sockfd, SIOCGIFHWADDR, &ifre);
-
-  for (i=0; i < (sizeof(types)/sizeof(*types))-1; i++)
-    if (ifre.ifr_hwaddr.sa_family == types[i].type) break;
-
-  xprintf("%-9s Link encap:%s  ", name, types[i].title);
-  if(i >= 0 && ifre.ifr_hwaddr.sa_family == ARPHRD_ETHER) {
-    xprintf("HWaddr ");
-    for (i=0; i<6; i++) xprintf(":%02X"+!i, ifre.ifr_hwaddr.sa_data[i]);
-  }
-  xputc('\n');
-
-  // If an address is assigned record that.
-
-  ifre.ifr_addr.sa_family = AF_INET;
-  memset(&ifre.ifr_addr, 0, sizeof(ifre.ifr_addr));
-  ioctl(TT.sockfd, SIOCGIFADDR, &ifre);
-  pp = (char *)&ifre.ifr_addr;
-  for (i = 0; i<sizeof(ifre.ifr_addr); i++) if (pp[i]) break;
-
-  if (i != sizeof(ifre.ifr_addr)) {
-    struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
-    struct {
-      char *name;
-      int flag, ioctl;
-    } addr[] = {
-      {"addr", 0, 0},
-      {"P-t-P", IFF_POINTOPOINT, SIOCGIFDSTADDR},
-      {"Bcast", IFF_BROADCAST, SIOCGIFBRDADDR},
-      {"Mask", 0, SIOCGIFNETMASK}
-    };
-
-    xprintf("%10c%s", ' ', (si->sin_family == AF_INET) ? "inet" :
-        (si->sin_family == AF_INET6) ? "inet6" : "unspec");
-
-    for (i=0; i < sizeof(addr)/sizeof(*addr); i++) {
-      if (!addr[i].flag || (flags & addr[i].flag)) {
-        if (addr[i].ioctl && ioctl(TT.sockfd, addr[i].ioctl, &ifre))
-          si->sin_family = 0;
-        xprintf(" %s:%s ", addr[i].name,
-          (si->sin_family == 0xFFFF || !si->sin_family)
-            ? "[NOT SET]" : inet_ntoa(si->sin_addr));
-      }
-    }
-
-    xputc('\n');
-  }
-
-  fp = fopen(pp = "/proc/net/if_inet6", "r");
-  if (fp) {
-    char iface_name[IFNAMSIZ];
-    int plen, iscope;
-
-    while (fgets(toybuf, sizeof(toybuf), fp)) {
-      int nitems;
-      char ipv6_addr[40];
-
-      nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n",
-                      ipv6_addr, &plen, &iscope, iface_name);
-      if (nitems<0 && feof(fp)) break;
-      if (nitems != 4) perror_exit("bad %s", pp);
-
-      if (!strcmp(name, iface_name)) {
-        struct sockaddr_in6 s6;
-        char *ptr = ipv6_addr+sizeof(ipv6_addr)-1;
-
-        // convert giant hex string into colon-spearated ipv6 address by
-        // inserting ':' every 4 characters. 
-        for (i = 32; i; i--)
-          if ((*(ptr--) = ipv6_addr[i])) if (!(i&3)) *(ptr--) = ':';
-
-        // Convert to binary and back to get abbreviated :: version
-        if (inet_pton(AF_INET6, ipv6_addr, (void *)&s6.sin6_addr) > 0) {
-          if (inet_ntop(AF_INET6, &s6.sin6_addr, toybuf, sizeof(toybuf))) {
-            char *scopes[] = {"Global","Host","Link","Site","Compat"},
-                 *scope = "Unknown";
-
-            for (i=0; i < sizeof(scopes)/sizeof(*scopes); i++)
-              if (iscope == (!!i)<<(i+3)) scope = scopes[i];
-            xprintf("%10cinet6 addr: %s/%d Scope: %s\n",
-                    ' ', toybuf, plen, scope);
-          }
-        }
-      }
-    }
-    fclose(fp);
-  }
-
-  xprintf("%10c", ' ');
-
-  if (flags) {
-    unsigned short mask = 1;
-    char **s, *str[] = {
-      "UP", "BROADCAST", "DEBUG", "LOOPBACK", "POINTOPOINT", "NOTRAILERS",
-      "RUNNING", "NOARP", "PROMISC", "ALLMULTI", "MASTER", "SLAVE", "MULTICAST",
-      "PORTSEL", "AUTOMEDIA", "DYNAMIC", NULL
-    };
-
-    for (s = str; *s; s++) {
-      if (flags & mask) xprintf("%s ", *s);
-      mask = mask << 1;
-    }
-  } else xprintf("[NO FLAGS] ");
-
-  if (ioctl(TT.sockfd, SIOCGIFMTU, &ifre) < 0) ifre.ifr_mtu = 0;
-  xprintf(" MTU:%d", ifre.ifr_mtu);
-  if (ioctl(TT.sockfd, SIOCGIFMETRIC, &ifre) < 0) ifre.ifr_metric = 0;
-  if (!ifre.ifr_metric) ifre.ifr_metric = 1;
-  xprintf("  Metric:%d", ifre.ifr_metric);
-
-  // non-virtual interface
-
-  if (val) {
-    char *label[] = {"RX bytes", "RX packets", "errors", "dropped", "overruns",
-      "frame", 0, 0, "TX bytes", "TX packets", "errors", "dropped", "overruns",
-      "collisions", "carrier", 0, "txqueuelen"};
-    signed char order[] = {-1, 1, 2, 3, 4, 5, -1, 9, 10, 11, 12, 14, -1,
-      13, 16, -1, 0, 8};
-    int i;
-
-    // Query txqueuelen
-    if (ioctl(TT.sockfd, SIOCGIFTXQLEN, &ifre) >= 0) val[16] = ifre.ifr_qlen;
-    else val[16] = -1;
-
-    for (i = 0; i < sizeof(order); i++) {
-      int j = order[i];
-
-      if (j < 0) xprintf("\n%10c", ' ');
-      else xprintf("%s:%llu ", label[j], val[j]);
-    }
-  }
-  xputc('\n');
-
-  if(!ioctl(TT.sockfd, SIOCGIFMAP, &ifre) && (ifre.ifr_map.irq ||
-      ifre.ifr_map.mem_start || ifre.ifr_map.dma || ifre.ifr_map.base_addr))
-  {
-    xprintf("%10c", ' ');
-    if(ifre.ifr_map.irq) xprintf("Interrupt:%d ", ifre.ifr_map.irq);
-    if(ifre.ifr_map.base_addr >= 0x100) // IO_MAP_INDEX
-      xprintf("Base address:0x%lx ", ifre.ifr_map.base_addr);
-    if(ifre.ifr_map.mem_start)
-      xprintf("Memory:%lx-%lx ", ifre.ifr_map.mem_start, ifre.ifr_map.mem_end);
-    if(ifre.ifr_map.dma) xprintf("DMA chan:%x ", ifre.ifr_map.dma);
-    xputc('\n');
-  }
-  xputc('\n');
-}
-
-static void show_iface(char *iface_name)
-{
-  char *name;
-  struct string_list *ifaces = 0, *sl;
-  int i, j;
-  FILE *fp;
-
-  fp = xfopen("/proc/net/dev", "r");
-
-  for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) {
-    char *buf = toybuf;
-    unsigned long long val[17];
-
-    if (i<2) continue;
-
-    while (isspace(*buf)) buf++;
-    name = strsep(&buf, ":");
-    if(!buf) error_exit("bad name %s", name);
-
-    errno = 0;
-    for (j=0; j<16 && !errno; j++) val[j] = strtoll(buf, &buf, 0);
-    if (errno) perror_exit("bad %s at %s", name, buf);
-
-    if (iface_name) {
-      if (!strcmp(iface_name, name)) {
-        display_ifconfig(iface_name, 1, val);
-
-        return;
-      }
-    } else {
-      sl = xmalloc(sizeof(*sl)+strlen(name)+1);
-      strcpy(sl->str, name);
-      sl->next = ifaces;
-      ifaces = sl;
-
-      display_ifconfig(sl->str, toys.optflags & FLAG_a, val);
-    }
-  }
-  fclose(fp);
-
-  if (iface_name) display_ifconfig(iface_name, 1, 0);
-  else {
-    struct ifconf ifcon;
-    struct ifreq *ifre;
-    int num;
-
-    // Loop until buffer's big enough
-    ifcon.ifc_buf = NULL;
-    for (num = 30;;num += 10) {
-      ifcon.ifc_len = sizeof(struct ifreq)*num;
-      ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len);
-      xioctl(TT.sockfd, SIOCGIFCONF, &ifcon);
-      if (ifcon.ifc_len != sizeof(struct ifreq)*num) break;
-    }
-
-    ifre = ifcon.ifc_req;
-    for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++)
-    {
-      // Skip duplicates
-      for(sl = ifaces; sl; sl = sl->next)
-        if(!strcmp(sl->str, ifre->ifr_name)) break;
-
-      if(!sl) display_ifconfig(ifre->ifr_name, toys.optflags & FLAG_a, 0);
-    }
-
-    free(ifcon.ifc_buf);
-  }
-
-  llist_traverse(ifaces, free);
-}
-
-// Encode offset and size of field into an int, and make result negative
-#define IFREQ_OFFSZ(x) -(int)((offsetof(struct ifreq, x)<<16) + sizeof(ifre.x))
-
-void ifconfig_main(void)
-{
-  char **argv = toys.optargs;
-  struct ifreq ifre;
-  int i;
-
-  TT.sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
-  if(toys.optc < 2) {
-    show_iface(*argv);
-    return;
-  }
-
-  // Open interface
-  memset(&ifre, 0, sizeof(struct ifreq));
-  xstrncpy(ifre.ifr_name, *argv, IFNAMSIZ);
-
-  // Perform operations on interface
-  while(*++argv) {
-    // Table of known operations
-    struct argh {
-      char *name;
-      int on, off; // set, clear
-    } try[] = {
-      {0, IFF_UP|IFF_RUNNING, SIOCSIFADDR},
-      {"up", IFF_UP|IFF_RUNNING, 0},
-      {"down", 0, IFF_UP},
-      {"arp", 0, IFF_NOARP},
-      {"trailers", 0, IFF_NOTRAILERS},
-      {"promisc", IFF_PROMISC, 0},
-      {"allmulti", IFF_ALLMULTI, 0},
-      {"multicast", IFF_MULTICAST, 0},
-      {"dynamic", IFF_DYNAMIC, 0},
-      {"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR},
-      {"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR},
-      {"netmask", 0, SIOCSIFNETMASK},
-      {"dstaddr", 0, SIOCSIFDSTADDR},
-      {"mtu", IFREQ_OFFSZ(ifr_mtu), SIOCSIFMTU},
-      {"keepalive", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE}, // SIOCSKEEPALIVE
-      {"outfill", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE+2}, // SIOCSOUTFILL
-      {"metric", IFREQ_OFFSZ(ifr_metric), SIOCSIFMETRIC},
-      {"txqueuelen", IFREQ_OFFSZ(ifr_qlen), SIOCSIFTXQLEN},
-      {"mem_start", IFREQ_OFFSZ(ifr_map.mem_start), SIOCSIFMAP},
-      {"io_addr", IFREQ_OFFSZ(ifr_map.base_addr), SIOCSIFMAP},
-      {"irq", IFREQ_OFFSZ(ifr_map.irq), SIOCSIFMAP},
-      {"inet", 0, 0},
-      {"inet6", 0, 0}
-    };
-    char *s = *argv;
-    int rev = (*s == '-');
-
-    s += rev;
-
-    // "set hardware address" is oddball enough to special case
-    if (!strcmp(*argv, "hw")) {
-      char *hw_addr, *ptr, *p;
-      struct sockaddr *sock = &ifre.ifr_hwaddr;
-      int count = 6;
-
-      ptr = p = (char *)sock->sa_data;
-      memset(sock, 0, sizeof(struct sockaddr));
-      if (!argv[1]) {
-        if (!strcmp("ether", *++argv)) sock->sa_family = ARPHRD_ETHER;
-        else if (!strcmp("infiniband", *argv)) {
-          sock->sa_family = ARPHRD_INFINIBAND;
-          count = 20;
-          p = ptr = toybuf;
-        }
-      }
-      if (!sock->sa_family || !argv[1]) {
-        toys.exithelp++;
-        error_exit("bad hw '%s'", *argv);
-      }
-      hw_addr = *++argv;
-
-      // Parse and verify address.
-      while (*hw_addr && (p-ptr) < count) {
-        int val, len = 0;
-
-        if (*hw_addr == ':') hw_addr++;
-        sscanf(hw_addr, "%2x%n", &val, &len);
-        if (len != 2) break;
-        hw_addr += len;
-        *p++ = val;
-      }
-
-      if ((p-ptr) != count || *hw_addr)
-        error_exit("bad hw-addr '%s'", hw_addr ? hw_addr : "");
-
-      // the linux kernel's "struct sockaddr" (include/linux/socket.h in the
-      // kernel source) only has 14 bytes of sa_data, and an infiniband address
-      // is 20. So if we go through the ioctl, the kernel will truncate
-      // infiniband addresses, meaning we have to go through sysfs instead.
-      if (sock->sa_family == ARPHRD_INFINIBAND && !strchr(ifre.ifr_name, '/')) {
-        int fd;
-
-        sprintf(toybuf, "/sys/class/net/%s/address", ifre.ifr_name);
-        fd = xopen(toybuf, O_RDWR);
-        xwrite(fd, *argv, strlen(*argv));
-        close(fd);
-      } else xioctl(TT.sockfd, SIOCSIFHWADDR, &ifre);
-      continue;
-
-    // Add/remove ipv6 address to interface
-
-    } else if (!strcmp(*argv, "add") || !strcmp(*argv, "del")) {
-      struct ifreq_inet6 {
-        struct in6_addr addr;
-        unsigned prefix;
-        int index;
-      } ifre6;
-      int plen = 128, fd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
-      char *prefix;
-
-      if (!argv[1]) {
-        toys.exithelp++;
-        error_exit(*argv);
-      }
-
-      prefix = strchr(argv[1], '/');
-      if (prefix) {
-        plen = atolx_range(prefix+1, 0, 128);
-        *prefix = 0;
-      }
-
-      get_addrinfo(argv[1], AF_INET6, &ifre6.addr);
-      xioctl(fd6, SIOCGIFINDEX, &ifre);
-      ifre6.index = ifre.ifr_ifindex;
-      ifre6.prefix = plen;
-      xioctl(fd6, **(argv++)=='a' ? SIOCSIFADDR : SIOCDIFADDR, &ifre6);
-
-      close(fd6);
-      continue;
-    // Iterate through table to find/perform operation
-    } else for (i = 0; i < sizeof(try)/sizeof(*try); i++) {
-      struct argh *t = try+i;
-      int on = t->on, off = t->off;
-
-      if (!t->name) {
-        if (isdigit(**argv) || !strcmp(*argv, "default")) argv--;
-        else continue;
-      } else if (strcmp(t->name, s)) continue;
-
-      // Is this an SIOCSI entry?
-      if ((off|0xff) == 0x89ff) {
-        if (!rev) {
-          if (!*++argv) show_help();
-
-          // Assign value to ifre field and call ioctl? (via IFREQ_OFFSZ.)
-          if (on < 0) {
-            long l = strtoul(*argv, 0, 0);
-
-            if (off == SIOCSIFMAP) xioctl(TT.sockfd, SIOCGIFMAP, &ifre);
-            on = -on;
-            poke((on>>16) + (char *)&ifre, l, on&15);
-            xioctl(TT.sockfd, off, &ifre);
-            break;
-          } else if (t->name || !strchr(ifre.ifr_name, ':')) {
-            struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
-
-            si->sin_family = AF_INET;
-
-            if (!strcmp(*argv, "default")) si->sin_addr.s_addr = INADDR_ANY;
-            else get_addrinfo(*argv, AF_INET, &si->sin_addr);
-            xioctl(TT.sockfd, off, &ifre);
-          }
-        }
-        off = 0;
-      }
-
-      // Set flags
-      if (on || off) {
-        xioctl(TT.sockfd, SIOCGIFFLAGS, &ifre);
-        ifre.ifr_flags &= ~(rev ? on : off);
-        ifre.ifr_flags |= (rev ? off : on);
-        xioctl(TT.sockfd, SIOCSIFFLAGS, &ifre);
-      }
-
-      break;
-    }
-    if (i == sizeof(try)/sizeof(*try)) {
-      toys.exithelp++;
-      error_exit("bad argument '%s'", *argv);
-    }
-  }
-  close(TT.sockfd);
-}