f15d4dad66
hacking on the mess in net-tools-1.59, but it currently adds 12k and supports ethernet, loop, ppp, and treats everything else as a generic interface. Works ok for me. -Erik
432 lines
9.8 KiB
C
432 lines
9.8 KiB
C
/* ifconfig
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*
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* Similar to the standard Unix ifconfig, but with only the necessary
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* parts for AF_INET, and without any printing of if info (for now).
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*
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* Bjorn Wesen, Axis Communications AB
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*
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*
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* Authors of the original ifconfig was:
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* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* $Id: ifconfig.c,v 1.4 2001/03/06 00:48:59 andersen Exp $
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*
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* Majorly hacked up by Larry Doolittle <ldoolitt@recycle.lbl.gov>
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*
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*/
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#include "busybox.h"
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h> // strcmp and friends
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#include <ctype.h> // isdigit and friends
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <linux/if_ether.h>
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static int sockfd; /* socket fd we use to manipulate stuff with */
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#define TESTME 0
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#if TESTME
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#define ioctl test_ioctl
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char *saddr_to_a(struct sockaddr *s)
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{
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if (s->sa_family == ARPHRD_ETHER) {
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static char hw[18];
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sprintf(hw, "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
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s->sa_data[0], s->sa_data[1], s->sa_data[2],
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s->sa_data[3], s->sa_data[4], s->sa_data[5]);
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return hw;
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} else if (s->sa_family == AF_INET) {
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struct sockaddr_in *ss = (struct sockaddr_in *) s;
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return inet_ntoa(ss->sin_addr);
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} else {
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return NULL;
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}
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}
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int test_ioctl(int __fd, unsigned long int __request, void *param)
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{
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struct ifreq *i=(struct ifreq *)param;
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printf("ioctl fd=%d, request=%ld\n", __fd, __request);
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switch(__request) {
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case SIOCGIFFLAGS: printf(" SIOCGIFFLAGS\n"); i->ifr_flags = 0; break;
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case SIOCSIFFLAGS: printf(" SIOCSIFFLAGS, %x\n", i->ifr_flags); break;
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case SIOCSIFMETRIC: printf(" SIOCSIFMETRIC, %d\n", i->ifr_metric); break;
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case SIOCSIFMTU: printf(" SIOCSIFMTU, %d\n", i->ifr_mtu); break;
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case SIOCSIFBRDADDR: printf(" SIOCSIFBRDADDR, %s\n", saddr_to_a(&(i->ifr_broadaddr))); break;
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case SIOCSIFDSTADDR: printf(" SIOCSIFDSTADDR, %s\n", saddr_to_a(&(i->ifr_dstaddr ))); break;
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case SIOCSIFNETMASK: printf(" SIOCSIFNETMASK, %s\n", saddr_to_a(&(i->ifr_netmask ))); break;
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case SIOCSIFADDR: printf(" SIOCSIFADDR, %s\n", saddr_to_a(&(i->ifr_addr ))); break;
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case SIOCSIFHWADDR: printf(" SIOCSIFHWADDR, %s\n", saddr_to_a(&(i->ifr_hwaddr ))); break; /* broken */
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default:
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}
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return 0;
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}
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#endif
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/* print usage and exit */
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#define _(x) x
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/* Set a certain interface flag. */
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static int
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set_flag(char *ifname, short flag)
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{
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struct ifreq ifr;
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strcpy(ifr.ifr_name, ifname);
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if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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perror("SIOCGIFFLAGS");
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return -1;
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}
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strcpy(ifr.ifr_name, ifname);
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ifr.ifr_flags |= flag;
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if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
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perror("SIOCSIFFLAGS");
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return -1;
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}
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return 0;
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}
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/* Clear a certain interface flag. */
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static int
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clr_flag(char *ifname, short flag)
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{
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struct ifreq ifr;
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strcpy(ifr.ifr_name, ifname);
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if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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perror("SIOCGIFFLAGS");
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return -1;
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}
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strcpy(ifr.ifr_name, ifname);
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ifr.ifr_flags &= ~flag;
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if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
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perror("SIOCSIFFLAGS");
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return -1;
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}
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return 0;
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}
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/* which element in struct ifreq to frob */
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enum frob {
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L_METRIC,
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L_MTU,
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L_DATA,
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L_BROAD,
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L_DEST,
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L_MASK,
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L_HWAD,
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};
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struct flag_map {
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char *name;
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enum frob frob;
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int flag;
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int sflag;
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int action;
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};
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/* action:
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* 2 set
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* 4 clear
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* 6 set/clear
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* 8 clear/set
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* 10 numeric
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* 12 address
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* 14 address/clear
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*/
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const static struct flag_map flag_table[] = {
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{"arp", 0, IFF_NOARP, 0, 6},
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{"trailers", 0, IFF_NOTRAILERS, 0, 6},
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{"promisc", 0, IFF_PROMISC, 0, 8},
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{"multicast", 0, IFF_MULTICAST, 0, 8},
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{"allmulti", 0, IFF_ALLMULTI, 0, 8},
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{"up", 0, (IFF_UP | IFF_RUNNING), 0, 2},
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{"down", 0, IFF_UP, 0, 4},
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{"metric", L_METRIC, 0, SIOCSIFMETRIC, 10},
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{"mtu", L_MTU, 0, SIOCSIFMTU, 10},
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#ifdef SIOCSKEEPALIVE
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{"keepalive", L_DATA, 0, SIOCSKEEPALIVE, 10},
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#endif
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#ifdef SIOCSOUTFILL
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{"outfill", L_DATA, 0, SIOCSOUTFILL, 10},
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#endif
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{"broadcast", L_BROAD, IFF_BROADCAST, SIOCSIFBRDADDR, 14},
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{"dstaddr", L_DEST, 0, SIOCSIFDSTADDR, 12},
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{"netmask", L_MASK, 0, SIOCSIFNETMASK, 12},
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{"pointopoint", L_DEST, IFF_POINTOPOINT, SIOCSIFDSTADDR, 14},
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{"hw", L_HWAD, 0, SIOCSIFHWADDR, 14},
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};
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/* resolve XXX.YYY.ZZZ.QQQ -> binary */
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static int
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INET_resolve(char *name, struct sockaddr_in *sin)
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{
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sin->sin_family = AF_INET;
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sin->sin_port = 0;
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/* Default is special, meaning 0.0.0.0. */
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if (strcmp(name, "default")==0) {
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sin->sin_addr.s_addr = INADDR_ANY;
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return 1;
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}
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/* Look to see if it's a dotted quad. */
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if (inet_aton(name, &sin->sin_addr)) {
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return 0;
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}
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/* guess not.. */
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errno = EINVAL;
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return -1;
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}
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/* Input an Ethernet address and convert to binary. */
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static int
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in_ether(char *bufp, struct sockaddr *sap)
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{
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unsigned char *ptr;
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char c, *orig;
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int i;
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unsigned val;
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sap->sa_family = ARPHRD_ETHER;
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ptr = sap->sa_data;
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i = 0;
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orig = bufp;
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while ((*bufp != '\0') && (i < ETH_ALEN)) {
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val = 0;
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c = *bufp++;
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if (isdigit(c))
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val = c - '0';
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else if (c >= 'a' && c <= 'f')
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val = c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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val = c - 'A' + 10;
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else {
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#ifdef DEBUG
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error_msg(
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_("in_ether(%s): invalid ether address!"),
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orig);
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#endif
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errno = EINVAL;
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return -1;
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}
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val <<= 4;
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c = *bufp;
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if (isdigit(c))
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val |= c - '0';
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else if (c >= 'a' && c <= 'f')
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val |= c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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val |= c - 'A' + 10;
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else if (c == ':' || c == 0)
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val >>= 4;
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else {
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#ifdef DEBUG
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error_msg(
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_("in_ether(%s): invalid ether address!"),
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orig);
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#endif
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errno = EINVAL;
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return -1;
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}
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if (c != 0)
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bufp++;
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*ptr++ = (unsigned char) (val & 0377);
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i++;
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/* optional colon already handled, don't swallow a second */
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}
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if(i != ETH_ALEN) {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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#ifdef BB_FEATURE_IFCONFIG_STATUS
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extern int display_interfaces(void);
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#else
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int display_interfaces(void)
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{
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show_usage();
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}
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#endif
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int ifconfig_main(int argc, char **argv)
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{
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struct ifreq ifr;
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struct sockaddr_in sa;
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char **spp, *cmd;
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int goterr = 0;
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int r;
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/* int didnetmask = 0; special case input error detection no longer implemented */
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char host[128];
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const struct flag_map *ft;
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int i, sense;
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int a, ecode;
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struct sockaddr *d;
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if(argc < 2) {
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return(display_interfaces());
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}
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/* Create a channel to the NET kernel. */
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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perror_msg_and_die("socket");
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}
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/* skip argv[0] */
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argc--;
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argv++;
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spp = argv;
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/* get interface name */
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safe_strncpy(ifr.ifr_name, *spp++, IFNAMSIZ);
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/* Process the remaining arguments. */
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while (*spp != (char *) NULL) {
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cmd = *spp;
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sense=0;
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if (*cmd=='-') {
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sense=1;
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cmd++;
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}
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ft = NULL;
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for (i=0; i<(sizeof(flag_table)/sizeof(struct flag_map)); i++) {
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if (strcmp(cmd, flag_table[i].name)==0) {
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ft=flag_table+i;
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spp++;
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break;
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}
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}
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if (ft) {
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switch (ft->action+sense) {
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case 4:
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case 7:
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case 8:
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case 15:
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goterr |= clr_flag(ifr.ifr_name, ft->flag);
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break;
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case 2:
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case 6:
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case 9:
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goterr |= set_flag(ifr.ifr_name, ft->flag);
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break;
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case 10:
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if (*spp == NULL)
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show_usage();
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a = atoi(*spp++);
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switch (ft->frob) {
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case L_METRIC: ifr.ifr_metric = a; break;
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case L_MTU: ifr.ifr_mtu = a; break;
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case L_DATA: ifr.ifr_data = (caddr_t) a; break;
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default: error_msg_and_die("bugaboo");
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}
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if (ioctl(sockfd, ft->sflag, &ifr) < 0) {
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perror(ft->name); /* imperfect */
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goterr++;
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}
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break;
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case 12:
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case 14:
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if (ft->action+sense==10 && *spp == NULL) {
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show_usage();
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break;
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}
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if (*spp != NULL) {
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safe_strncpy(host, *spp, (sizeof host));
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spp++;
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if (ft->frob == L_HWAD) {
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ecode = in_ether(host, &ifr.ifr_hwaddr);
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} else {
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switch (ft->frob) {
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case L_BROAD: d = &ifr.ifr_broadaddr; break;
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case L_DEST: d = &ifr.ifr_dstaddr; break;
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case L_MASK: d = &ifr.ifr_netmask; break;
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default: error_msg_and_die("bugaboo");
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}
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ecode = INET_resolve(host, (struct sockaddr_in *) d);
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}
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if (ecode < 0 || ioctl(sockfd, ft->sflag, &ifr) < 0) {
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perror(ft->name); /* imperfect */
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goterr++;
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}
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}
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if (ft->flag != 0) {
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goterr |= set_flag(ifr.ifr_name, ft->flag);
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}
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break;
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default:
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show_usage();
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} /* end of switch */
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continue;
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}
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/* If the next argument is a valid hostname, assume OK. */
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safe_strncpy(host, *spp, (sizeof host));
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if (INET_resolve(host, &sa) < 0) {
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show_usage();
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}
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memcpy((char *) &ifr.ifr_addr,
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(char *) &sa, sizeof(struct sockaddr));
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r = ioctl(sockfd, SIOCSIFADDR, &ifr);
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if (r < 0) {
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perror("SIOCSIFADDR");
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goterr++;
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}
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/*
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* Don't do the set_flag() if the address is an alias with a - at the
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* end, since it's deleted already! - Roman
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*
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* Should really use regex.h here, not sure though how well it'll go
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* with the cross-platform support etc.
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*/
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{
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char *ptr;
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short int found_colon = 0;
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for (ptr = ifr.ifr_name; *ptr; ptr++ )
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if (*ptr == ':') found_colon++;
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if (!(found_colon && *(ptr - 1) == '-'))
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goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
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}
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spp++;
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} /* end of while-loop */
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return goterr;
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}
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