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551 lines
17 KiB
551 lines
17 KiB
/* ifconfig.c - Configure network interface.
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*
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* Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com>
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* Copyright 2012 Kyungwan Han <asura321@gamil.com>
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* Reviewed by Kyungsu Kim <kaspyx@gmail.com>
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*
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* Not in SUSv4.
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*
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* Obsolete fields included for historical purposes:
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* irq|io_addr|mem_start ADDR - micromanage obsolete hardware
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* outfill|keepalive INTEGER - SLIP analog dialup line quality monitoring
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* metric INTEGER - added to Linux 0.9.10 with comment "never used", still true
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USE_IFCONFIG(NEWTOY(ifconfig, "^?aS", TOYFLAG_SBIN))
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config IFCONFIG
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bool "ifconfig"
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default y
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help
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usage: ifconfig [-aS] [INTERFACE [ACTION...]]
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Display or configure network interface.
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With no arguments, display active interfaces. First argument is interface
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to operate on, one argument by itself displays that interface.
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-a All interfaces displayed, not just active ones
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-S Short view, one line per interface
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Standard ACTIONs to perform on an INTERFACE:
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ADDR[/MASK] - set IPv4 address (1.2.3.4/5) and activate interface
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add|del ADDR[/LEN] - add/remove IPv6 address (1111::8888/128)
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up|down - activate or deactivate interface
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Advanced ACTIONs (default values usually suffice):
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default - remove IPv4 address
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netmask ADDR - set IPv4 netmask via 255.255.255.0 instead of /24
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txqueuelen LEN - number of buffered packets before output blocks
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mtu LEN - size of outgoing packets (Maximum Transmission Unit)
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broadcast ADDR - Set broadcast address
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pointopoint ADDR - PPP and PPPOE use this instead of "route add default gw"
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hw TYPE ADDR - set hardware (mac) address (type = ether|infiniband)
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Flags you can set on an interface (or -remove by prefixing with -):
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arp - don't use Address Resolution Protocol to map LAN routes
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promisc - don't discard packets that aren't to this LAN hardware address
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multicast - force interface into multicast mode if the driver doesn't
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allmulti - promisc for multicast packets
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*/
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#define FOR_ifconfig
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#include "toys.h"
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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GLOBALS(
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int sockfd;
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)
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// Convert hostname to binary address for AF_INET or AF_INET6
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// return /prefix (or range max if none)
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static int get_addrinfo(char *host, sa_family_t af, void *addr)
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{
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struct addrinfo hints, *result, *rp = 0;
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int status, len;
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char *from, *slash;
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memset(&hints, 0 , sizeof(struct addrinfo));
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hints.ai_family = af;
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hints.ai_socktype = SOCK_STREAM;
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slash = strchr(host, '/');
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if (slash) *slash = 0;
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status = getaddrinfo(host, NULL, &hints, &result);
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if (!status)
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for (rp = result; rp; rp = rp->ai_next)
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if (rp->ai_family == af) break;
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if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status));
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// ai_addr isn't struct in_addr or in6_addr, it's struct sockaddr. Of course.
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// You'd think ipv4 and ipv6 would have some basic compatibility, but no.
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from = ((char *)rp->ai_addr) + 4;
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if (af == AF_INET6) {
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len = 16;
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from += 4; // skip "flowinfo" field ipv6 puts before address
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} else len = 4;
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memcpy(addr, from, len);
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freeaddrinfo(result);
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len = -1;
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if (slash) len = atolx_range(slash+1, 0, (af == AF_INET) ? 32 : 128);
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return len;
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}
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static void display_ifconfig(char *name, int always, unsigned long long val[])
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{
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struct ifreq ifre;
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struct sockaddr_in *si = (void *)&ifre.ifr_addr;
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struct {
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int type;
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char *title;
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} types[] = {
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{ARPHRD_LOOPBACK, "Local Loopback"}, {ARPHRD_ETHER, "Ethernet"},
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{ARPHRD_PPP, "Point-to-Point Protocol"}, {ARPHRD_INFINIBAND, "InfiniBand"},
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{ARPHRD_SIT, "IPv6-in-IPv4"}, {-1, "UNSPEC"}
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};
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int i;
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char *pp;
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FILE *fp;
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short flags;
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xstrncpy(ifre.ifr_name, name, IFNAMSIZ);
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if (ioctl(TT.sockfd, SIOCGIFFLAGS, &ifre)<0) perror_exit_raw(name);
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flags = ifre.ifr_flags;
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if (!always && !(flags & IFF_UP)) return;
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if (toys.optflags&FLAG_S) {
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unsigned uu = 0;
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int len;
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ioctl(TT.sockfd, SIOCGIFADDR, &ifre);
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len = printf("%*s %s", -9, name, inet_ntoa(si->sin_addr));
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if (!ioctl(TT.sockfd, SIOCGIFNETMASK, &ifre))
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uu = htonl(*(unsigned *)&(si->sin_addr));
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for (i = 0; uu; i++) uu <<= 1;
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len += printf("/%d", i);
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printf("%*c", 29-len, ' ');
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}
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// Query hardware type and hardware address.
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// Not xioctl because you don't have permission for this on Android.
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ioctl(TT.sockfd, SIOCGIFHWADDR, &ifre);
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if (toys.optflags&FLAG_S)
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for (i=0; i<6; i++) printf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]);
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else {
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for (i=0; i < ARRAY_LEN(types)-1; i++)
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if (ifre.ifr_hwaddr.sa_family == types[i].type) break;
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xprintf("%-9s Link encap:%s ", name, types[i].title);
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if(ifre.ifr_hwaddr.sa_family == ARPHRD_ETHER) {
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xprintf("HWaddr ");
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for (i=0; i<6; i++) xprintf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]);
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}
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sprintf(toybuf, "/sys/class/net/%.15s/device/driver", name);
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if (readlink0(toybuf, toybuf, sizeof(toybuf))>0)
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if ((pp = strrchr(toybuf, '/'))) xprintf(" Driver %s", pp+1);
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xputc('\n');
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}
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// If an address is assigned record that.
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ifre.ifr_addr.sa_family = AF_INET;
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memset(&ifre.ifr_addr, 0, sizeof(ifre.ifr_addr));
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ioctl(TT.sockfd, SIOCGIFADDR, &ifre);
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pp = (char *)&ifre.ifr_addr;
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for (i = 0; i<sizeof(ifre.ifr_addr); i++) if (pp[i]) break;
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if (!(toys.optflags&FLAG_S) && i != sizeof(ifre.ifr_addr)) {
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struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
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struct {
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char *name;
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int flag, ioctl;
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} addr[] = {
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{"addr", 0, 0},
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{"P-t-P", IFF_POINTOPOINT, SIOCGIFDSTADDR},
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{"Bcast", IFF_BROADCAST, SIOCGIFBRDADDR},
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{"Mask", 0, SIOCGIFNETMASK}
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};
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// TODO: can this be ipv6? Why are we checking here when ipv6 source later?
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xprintf("%10c%s", ' ', (si->sin_family == AF_INET) ? "inet" :
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(si->sin_family == AF_INET6) ? "inet6" : "unspec");
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for (i=0; i<ARRAY_LEN(addr); i++) {
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if (!addr[i].flag || (flags & addr[i].flag)) {
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if (addr[i].ioctl && ioctl(TT.sockfd, addr[i].ioctl, &ifre))
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si->sin_family = 0;
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xprintf(" %s:%s ", addr[i].name,
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(si->sin_family == 0xFFFF || !si->sin_family)
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? "[NOT SET]" : inet_ntoa(si->sin_addr));
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}
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}
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xputc('\n');
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}
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fp = fopen(pp = "/proc/net/if_inet6", "r");
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if (fp) {
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char iface_name[IFNAMSIZ];
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int plen, iscope;
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while (fgets(toybuf, sizeof(toybuf), fp)) {
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int nitems;
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char ipv6_addr[40];
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nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n",
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ipv6_addr, &plen, &iscope, iface_name);
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if (nitems<0 && feof(fp)) break;
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if (nitems != 4) perror_exit("bad %s", pp);
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if (!strcmp(name, iface_name)) {
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struct sockaddr_in6 s6;
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char *ptr = ipv6_addr+sizeof(ipv6_addr)-1;
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// convert giant hex string into colon-spearated ipv6 address by
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// inserting ':' every 4 characters.
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for (i = 32; i; i--)
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if ((*(ptr--) = ipv6_addr[i])) if (!(i&3)) *(ptr--) = ':';
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// Convert to binary and back to get abbreviated :: version
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if (inet_pton(AF_INET6, ipv6_addr, (void *)&s6.sin6_addr) > 0) {
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if (inet_ntop(AF_INET6, &s6.sin6_addr, toybuf, sizeof(toybuf))) {
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char *scopes[] = {"Global","Host","Link","Site","Compat"},
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*scope = "Unknown";
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for (i=0; i<ARRAY_LEN(scopes); i++)
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if (iscope == (!!i)<<(i+3)) scope = scopes[i];
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if (toys.optflags&FLAG_S) xprintf(" %s/%d@%c", toybuf, plen,*scope);
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else xprintf("%10cinet6 addr: %s/%d Scope: %s\n",
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' ', toybuf, plen, scope);
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}
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}
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}
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}
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fclose(fp);
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}
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if (toys.optflags&FLAG_S) {
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xputc('\n');
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return;
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}
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xprintf("%10c", ' ');
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if (flags) {
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unsigned short mask = 1;
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char **s, *str[] = {
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"UP", "BROADCAST", "DEBUG", "LOOPBACK", "POINTOPOINT", "NOTRAILERS",
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"RUNNING", "NOARP", "PROMISC", "ALLMULTI", "MASTER", "SLAVE", "MULTICAST",
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"PORTSEL", "AUTOMEDIA", "DYNAMIC", NULL
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};
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for (s = str; *s; s++) {
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if (flags & mask) xprintf("%s ", *s);
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mask = mask << 1;
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}
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} else xprintf("[NO FLAGS] ");
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if (ioctl(TT.sockfd, SIOCGIFMTU, &ifre) < 0) ifre.ifr_mtu = 0;
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xprintf(" MTU:%d", ifre.ifr_mtu);
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if (ioctl(TT.sockfd, SIOCGIFMETRIC, &ifre) < 0) ifre.ifr_metric = 0;
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if (!ifre.ifr_metric) ifre.ifr_metric = 1;
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xprintf(" Metric:%d", ifre.ifr_metric);
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// non-virtual interface
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if (val) {
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char *label[] = {"RX bytes", "RX packets", "errors", "dropped", "overruns",
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"frame", 0, 0, "TX bytes", "TX packets", "errors", "dropped", "overruns",
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"collisions", "carrier", 0, "txqueuelen"};
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signed char order[] = {-1, 1, 2, 3, 4, 5, -1, 9, 10, 11, 12, 14, -1,
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13, 16, -1, 0, 8};
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int i;
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// Query txqueuelen
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if (ioctl(TT.sockfd, SIOCGIFTXQLEN, &ifre) >= 0) val[16] = ifre.ifr_qlen;
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else val[16] = -1;
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for (i = 0; i<sizeof(order); i++) {
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int j = order[i];
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if (j < 0) xprintf("\n%10c", ' ');
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else xprintf("%s:%llu ", label[j], val[j]);
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}
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}
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xputc('\n');
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if(!ioctl(TT.sockfd, SIOCGIFMAP, &ifre) && (ifre.ifr_map.irq ||
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ifre.ifr_map.mem_start || ifre.ifr_map.dma || ifre.ifr_map.base_addr))
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{
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xprintf("%10c", ' ');
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if(ifre.ifr_map.irq) xprintf("Interrupt:%d ", ifre.ifr_map.irq);
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if(ifre.ifr_map.base_addr >= 0x100) // IO_MAP_INDEX
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xprintf("Base address:0x%x ", ifre.ifr_map.base_addr);
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if(ifre.ifr_map.mem_start)
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xprintf("Memory:%lx-%lx ", ifre.ifr_map.mem_start, ifre.ifr_map.mem_end);
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if(ifre.ifr_map.dma) xprintf("DMA chan:%x ", ifre.ifr_map.dma);
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xputc('\n');
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}
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xputc('\n');
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}
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static void show_iface(char *iface_name)
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{
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char *name;
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struct string_list *ifaces = 0, *sl;
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int i, j;
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FILE *fp;
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fp = xfopen("/proc/net/dev", "r");
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for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) {
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char *buf = toybuf;
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unsigned long long val[17];
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if (i<2) continue;
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while (isspace(*buf)) buf++;
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name = strsep(&buf, ":");
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if(!buf) error_exit("bad name %s", name);
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errno = 0;
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for (j=0; j<16 && !errno; j++) val[j] = strtoll(buf, &buf, 0);
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if (errno) perror_exit("bad %s at %s", name, buf);
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if (iface_name) {
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if (!strcmp(iface_name, name)) {
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display_ifconfig(iface_name, 1, val);
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return;
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}
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} else {
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sl = xmalloc(sizeof(*sl)+strlen(name)+1);
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strcpy(sl->str, name);
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sl->next = ifaces;
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ifaces = sl;
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display_ifconfig(sl->str, toys.optflags & FLAG_a, val);
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}
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}
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fclose(fp);
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if (iface_name) display_ifconfig(iface_name, 1, 0);
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else {
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struct ifconf ifcon;
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struct ifreq *ifre;
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int num;
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// Loop until buffer's big enough
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ifcon.ifc_buf = NULL;
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for (num = 30;;num += 10) {
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ifcon.ifc_len = sizeof(struct ifreq)*num;
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ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len);
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xioctl(TT.sockfd, SIOCGIFCONF, &ifcon);
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if (ifcon.ifc_len != sizeof(struct ifreq)*num) break;
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}
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ifre = ifcon.ifc_req;
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for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++)
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{
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// Skip duplicates
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for(sl = ifaces; sl; sl = sl->next)
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if(!strcmp(sl->str, ifre->ifr_name)) break;
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if(!sl) display_ifconfig(ifre->ifr_name, toys.optflags & FLAG_a, 0);
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}
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free(ifcon.ifc_buf);
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}
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llist_traverse(ifaces, free);
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}
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// Encode offset and size of field into an int, and make result negative
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#define IFREQ_OFFSZ(x) -(int)((offsetof(struct ifreq, x)<<16) + sizeof(ifre.x))
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void ifconfig_main(void)
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{
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char **argv = toys.optargs;
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struct ifreq ifre;
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int i;
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TT.sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
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if(toys.optc < 2) {
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show_iface(*argv);
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return;
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}
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// Open interface
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memset(&ifre, 0, sizeof(struct ifreq));
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xstrncpy(ifre.ifr_name, *argv, IFNAMSIZ);
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// Perform operations on interface
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while(*++argv) {
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// Table of known operations
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struct argh {
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char *name;
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int on, off; // set, clear
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} try[] = {
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{0, IFF_UP|IFF_RUNNING, SIOCSIFADDR},
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{"up", IFF_UP|IFF_RUNNING, 0},
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{"down", 0, IFF_UP},
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{"arp", 0, IFF_NOARP},
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{"promisc", IFF_PROMISC, 0},
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{"allmulti", IFF_ALLMULTI, 0},
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{"multicast", IFF_MULTICAST, 0},
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{"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR},
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{"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR},
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{"netmask", 0, SIOCSIFNETMASK},
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{"dstaddr", 0, SIOCSIFDSTADDR},
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{"mtu", IFREQ_OFFSZ(ifr_mtu), SIOCSIFMTU},
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{"keepalive", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE}, // SIOCSKEEPALIVE
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{"outfill", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE+2}, // SIOCSOUTFILL
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{"metric", IFREQ_OFFSZ(ifr_metric), SIOCSIFMETRIC},
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{"txqueuelen", IFREQ_OFFSZ(ifr_qlen), SIOCSIFTXQLEN},
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{"mem_start", IFREQ_OFFSZ(ifr_map.mem_start), SIOCSIFMAP},
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{"io_addr", IFREQ_OFFSZ(ifr_map.base_addr), SIOCSIFMAP},
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{"irq", IFREQ_OFFSZ(ifr_map.irq), SIOCSIFMAP},
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{"inet", 0, 0},
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{"inet6", 0, 0}
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};
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char *s = *argv;
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int rev = (*s == '-');
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s += rev;
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// "set hardware address" is oddball enough to special case
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if (!strcmp(*argv, "hw")) {
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char *hw_addr, *ptr, *p;
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struct sockaddr *sock = &ifre.ifr_hwaddr;
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int count = 6;
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ptr = p = (char *)sock->sa_data;
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memset(sock, 0, sizeof(struct sockaddr));
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if (argv[1]) {
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if (!strcmp("ether", *++argv)) sock->sa_family = ARPHRD_ETHER;
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else if (!strcmp("infiniband", *argv)) {
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sock->sa_family = ARPHRD_INFINIBAND;
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count = 20;
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p = ptr = toybuf;
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}
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}
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if (!sock->sa_family || !argv[1]) help_exit("bad hw '%s'", *argv);
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hw_addr = *++argv;
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// Parse and verify address.
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while (*hw_addr && (p-ptr) < count) {
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int val, len = 0;
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if (*hw_addr == ':') hw_addr++;
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sscanf(hw_addr, "%2x%n", &val, &len);
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|
if (!len || len > 2) break; // 1 nibble can be set e.g. C2:79:38:95:D:A
|
|
hw_addr += len;
|
|
*p++ = val;
|
|
}
|
|
|
|
if ((p-ptr) != count || *hw_addr)
|
|
error_exit("bad hw-addr '%s'", *argv);
|
|
|
|
// 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, fd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
|
|
|
|
if (!argv[1]) help_exit("%s", *argv);
|
|
|
|
plen = get_addrinfo(argv[1], AF_INET6, &ifre6.addr);
|
|
if (plen < 0) plen = 128;
|
|
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<ARRAY_LEN(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) error_exit("%s needs argument", t->name);
|
|
|
|
// 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 {
|
|
struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
|
|
int mask = -1;
|
|
|
|
si->sin_family = AF_INET;
|
|
|
|
if (!strcmp(*argv, "default")) si->sin_addr.s_addr = INADDR_ANY;
|
|
else mask = get_addrinfo(*argv, AF_INET, &si->sin_addr);
|
|
xioctl(TT.sockfd, off, &ifre);
|
|
|
|
// Handle /netmask
|
|
if (mask >= 0) {
|
|
// sin_addr probably isn't unaligned, but just in case...
|
|
mask = htonl((~0)<<(32-mask));
|
|
memcpy(&si->sin_addr, &mask, 4);
|
|
xioctl(TT.sockfd, SIOCSIFNETMASK, &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 == ARRAY_LEN(try)) help_exit("bad argument '%s'", *argv);
|
|
}
|
|
close(TT.sockfd);
|
|
}
|