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477 lines
10 KiB
C
477 lines
10 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 1.1 2001/02/14 08:11:27 andersen Exp $
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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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/* 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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/* 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")) {
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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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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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fprintf(stderr,
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_("in_ether(%s): invalid ether address!\n"),
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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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fprintf(stderr,
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_("in_ether(%s): invalid ether address!\n"),
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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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/* We might get a semicolon here - not required. */
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if (*bufp == ':')
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bufp++;
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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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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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struct sockaddr sa2;
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char **spp;
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int goterr = 0;
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int r, didnetmask = 0;
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char host[128];
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if(argc < 2) {
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usage(ifconfig_usage);
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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("socket");
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exit(1);
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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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if (!strcmp(*spp, "arp")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_NOARP);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "-arp")) {
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goterr |= set_flag(ifr.ifr_name, IFF_NOARP);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "trailers")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_NOTRAILERS);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "-trailers")) {
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goterr |= set_flag(ifr.ifr_name, IFF_NOTRAILERS);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "promisc")) {
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goterr |= set_flag(ifr.ifr_name, IFF_PROMISC);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "-promisc")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_PROMISC);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "multicast")) {
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goterr |= set_flag(ifr.ifr_name, IFF_MULTICAST);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "-multicast")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_MULTICAST);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "allmulti")) {
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goterr |= set_flag(ifr.ifr_name, IFF_ALLMULTI);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "-allmulti")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_ALLMULTI);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "up")) {
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goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
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spp++;
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continue;
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}
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if (!strcmp(*spp, "down")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_UP);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "metric")) {
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if (*++spp == NULL)
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usage(ifconfig_usage);
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ifr.ifr_metric = atoi(*spp);
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if (ioctl(sockfd, SIOCSIFMETRIC, &ifr) < 0) {
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fprintf(stderr, "SIOCSIFMETRIC: %s\n", strerror(errno));
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goterr++;
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}
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spp++;
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continue;
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}
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if (!strcmp(*spp, "mtu")) {
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if (*++spp == NULL)
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usage(ifconfig_usage);
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ifr.ifr_mtu = atoi(*spp);
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if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
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fprintf(stderr, "SIOCSIFMTU: %s\n", strerror(errno));
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goterr++;
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}
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spp++;
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continue;
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}
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#ifdef SIOCSKEEPALIVE
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if (!strcmp(*spp, "keepalive")) {
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if (*++spp == NULL)
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usage(ifconfig_usage);
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ifr.ifr_data = (caddr_t) atoi(*spp);
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if (ioctl(sockfd, SIOCSKEEPALIVE, &ifr) < 0) {
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fprintf(stderr, "SIOCSKEEPALIVE: %s\n", strerror(errno));
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goterr++;
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}
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spp++;
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continue;
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}
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#endif
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#ifdef SIOCSOUTFILL
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if (!strcmp(*spp, "outfill")) {
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if (*++spp == NULL)
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usage(ifconfig_usage);
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ifr.ifr_data = (caddr_t) atoi(*spp);
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if (ioctl(sockfd, SIOCSOUTFILL, &ifr) < 0) {
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fprintf(stderr, "SIOCSOUTFILL: %s\n", strerror(errno));
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goterr++;
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}
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spp++;
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continue;
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}
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#endif
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if (!strcmp(*spp, "-broadcast")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_BROADCAST);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "broadcast")) {
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if (*++spp != NULL) {
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safe_strncpy(host, *spp, (sizeof host));
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if (INET_resolve(host, &sa) < 0) {
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goterr++;
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spp++;
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continue;
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}
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memcpy((char *) &ifr.ifr_broadaddr,
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(char *) &sa,
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sizeof(struct sockaddr));
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if (ioctl(sockfd, SIOCSIFBRDADDR, &ifr) < 0) {
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perror("SIOCSIFBRDADDR");
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goterr++;
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}
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spp++;
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}
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goterr |= set_flag(ifr.ifr_name, IFF_BROADCAST);
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continue;
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}
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if (!strcmp(*spp, "dstaddr")) {
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if (*++spp == NULL)
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usage(ifconfig_usage);
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safe_strncpy(host, *spp, (sizeof host));
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if (INET_resolve(host, &sa) < 0) {
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goterr++;
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spp++;
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continue;
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}
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memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
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sizeof(struct sockaddr));
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if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
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fprintf(stderr, "SIOCSIFDSTADDR: %s\n",
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strerror(errno));
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goterr++;
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}
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spp++;
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continue;
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}
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if (!strcmp(*spp, "netmask")) {
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if (*++spp == NULL || didnetmask)
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usage(ifconfig_usage);
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safe_strncpy(host, *spp, (sizeof host));
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if (INET_resolve(host, &sa) < 0) {
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goterr++;
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spp++;
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continue;
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}
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didnetmask++;
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memcpy((char *) &ifr.ifr_netmask, (char *) &sa,
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sizeof(struct sockaddr));
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if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
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perror("SIOCSIFNETMASK");
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goterr++;
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}
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spp++;
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continue;
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}
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if (!strcmp(*spp, "-pointopoint")) {
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goterr |= clr_flag(ifr.ifr_name, IFF_POINTOPOINT);
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spp++;
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continue;
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}
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if (!strcmp(*spp, "pointopoint")) {
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if (*(spp + 1) != NULL) {
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spp++;
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safe_strncpy(host, *spp, (sizeof host));
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if (INET_resolve(host, &sa)) {
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goterr++;
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spp++;
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continue;
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}
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memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
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sizeof(struct sockaddr));
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if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
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perror("SIOCSIFDSTADDR");
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goterr++;
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}
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}
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goterr |= set_flag(ifr.ifr_name, IFF_POINTOPOINT);
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spp++;
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continue;
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};
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if (!strcmp(*spp, "hw")) {
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if (*++spp == NULL || strcmp("ether", *spp)) {
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usage(ifconfig_usage);
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}
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if (*++spp == NULL) {
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/* silently ignore it if no address */
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continue;
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}
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safe_strncpy(host, *spp, (sizeof host));
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if (in_ether(host, &sa2) < 0) {
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fprintf(stderr, "invalid hw-addr %s\n", host);
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goterr++;
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spp++;
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continue;
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}
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memcpy((char *) &ifr.ifr_hwaddr, (char *) &sa2,
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sizeof(struct sockaddr));
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if (ioctl(sockfd, SIOCSIFHWADDR, &ifr) < 0) {
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perror("SIOCSIFHWADDR");
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goterr++;
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}
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spp++;
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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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usage(ifconfig_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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exit(0);
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}
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