477 lines
10 KiB
C
477 lines
10 KiB
C
/* ifconfig
|
|
*
|
|
* Similar to the standard Unix ifconfig, but with only the necessary
|
|
* parts for AF_INET, and without any printing of if info (for now).
|
|
*
|
|
* Bjorn Wesen, Axis Communications AB
|
|
*
|
|
*
|
|
* Authors of the original ifconfig was:
|
|
* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
|
|
*
|
|
* This program is free software; you can redistribute it
|
|
* and/or modify it under the terms of the GNU General
|
|
* Public License as published by the Free Software
|
|
* Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* $Id: ifconfig.c,v 1.1 2001/02/14 08:11:27 andersen Exp $
|
|
*
|
|
*/
|
|
|
|
#include "busybox.h"
|
|
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <string.h> // strcmp and friends
|
|
#include <ctype.h> // isdigit and friends
|
|
#include <sys/socket.h>
|
|
#include <sys/ioctl.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <net/if.h>
|
|
#include <net/if_arp.h>
|
|
#include <linux/if_ether.h>
|
|
|
|
static int sockfd; /* socket fd we use to manipulate stuff with */
|
|
|
|
/* print usage and exit */
|
|
|
|
#define _(x) x
|
|
|
|
/* Set a certain interface flag. */
|
|
static int
|
|
set_flag(char *ifname, short flag)
|
|
{
|
|
struct ifreq ifr;
|
|
|
|
strcpy(ifr.ifr_name, ifname);
|
|
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
|
|
perror("SIOCGIFFLAGS");
|
|
return (-1);
|
|
}
|
|
strcpy(ifr.ifr_name, ifname);
|
|
ifr.ifr_flags |= flag;
|
|
if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
|
|
perror("SIOCSIFFLAGS");
|
|
return -1;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* Clear a certain interface flag. */
|
|
static int
|
|
clr_flag(char *ifname, short flag)
|
|
{
|
|
struct ifreq ifr;
|
|
|
|
strcpy(ifr.ifr_name, ifname);
|
|
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
|
|
perror("SIOCGIFFLAGS");
|
|
return -1;
|
|
}
|
|
strcpy(ifr.ifr_name, ifname);
|
|
ifr.ifr_flags &= ~flag;
|
|
if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
|
|
perror("SIOCSIFFLAGS");
|
|
return -1;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* resolve XXX.YYY.ZZZ.QQQ -> binary */
|
|
|
|
static int
|
|
INET_resolve(char *name, struct sockaddr_in *sin)
|
|
{
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_port = 0;
|
|
|
|
/* Default is special, meaning 0.0.0.0. */
|
|
if (!strcmp(name, "default")) {
|
|
sin->sin_addr.s_addr = INADDR_ANY;
|
|
return (1);
|
|
}
|
|
/* Look to see if it's a dotted quad. */
|
|
if (inet_aton(name, &sin->sin_addr)) {
|
|
return 0;
|
|
}
|
|
/* guess not.. */
|
|
return -1;
|
|
}
|
|
|
|
/* Input an Ethernet address and convert to binary. */
|
|
static int
|
|
in_ether(char *bufp, struct sockaddr *sap)
|
|
{
|
|
unsigned char *ptr;
|
|
char c, *orig;
|
|
int i;
|
|
unsigned val;
|
|
|
|
sap->sa_family = ARPHRD_ETHER;
|
|
ptr = sap->sa_data;
|
|
|
|
i = 0;
|
|
orig = bufp;
|
|
while ((*bufp != '\0') && (i < ETH_ALEN)) {
|
|
val = 0;
|
|
c = *bufp++;
|
|
if (isdigit(c))
|
|
val = c - '0';
|
|
else if (c >= 'a' && c <= 'f')
|
|
val = c - 'a' + 10;
|
|
else if (c >= 'A' && c <= 'F')
|
|
val = c - 'A' + 10;
|
|
else {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
_("in_ether(%s): invalid ether address!\n"),
|
|
orig);
|
|
#endif
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
val <<= 4;
|
|
c = *bufp;
|
|
if (isdigit(c))
|
|
val |= c - '0';
|
|
else if (c >= 'a' && c <= 'f')
|
|
val |= c - 'a' + 10;
|
|
else if (c >= 'A' && c <= 'F')
|
|
val |= c - 'A' + 10;
|
|
else if (c == ':' || c == 0)
|
|
val >>= 4;
|
|
else {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
_("in_ether(%s): invalid ether address!\n"),
|
|
orig);
|
|
#endif
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
if (c != 0)
|
|
bufp++;
|
|
*ptr++ = (unsigned char) (val & 0377);
|
|
i++;
|
|
|
|
/* We might get a semicolon here - not required. */
|
|
if (*bufp == ':')
|
|
bufp++;
|
|
|
|
}
|
|
|
|
if(i != ETH_ALEN) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ifconfig_main(int argc, char **argv)
|
|
{
|
|
struct ifreq ifr;
|
|
struct sockaddr_in sa;
|
|
struct sockaddr sa2;
|
|
char **spp;
|
|
int goterr = 0;
|
|
int r, didnetmask = 0;
|
|
char host[128];
|
|
|
|
if(argc < 2) {
|
|
usage(ifconfig_usage);
|
|
}
|
|
|
|
/* Create a channel to the NET kernel. */
|
|
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
|
|
perror("socket");
|
|
exit(1);
|
|
}
|
|
|
|
/* skip argv[0] */
|
|
|
|
argc--;
|
|
argv++;
|
|
|
|
spp = argv;
|
|
|
|
/* get interface name */
|
|
|
|
safe_strncpy(ifr.ifr_name, *spp++, IFNAMSIZ);
|
|
|
|
/* Process the remaining arguments. */
|
|
while (*spp != (char *) NULL) {
|
|
if (!strcmp(*spp, "arp")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_NOARP);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "-arp")) {
|
|
goterr |= set_flag(ifr.ifr_name, IFF_NOARP);
|
|
spp++;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(*spp, "trailers")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_NOTRAILERS);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "-trailers")) {
|
|
goterr |= set_flag(ifr.ifr_name, IFF_NOTRAILERS);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "promisc")) {
|
|
goterr |= set_flag(ifr.ifr_name, IFF_PROMISC);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "-promisc")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_PROMISC);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "multicast")) {
|
|
goterr |= set_flag(ifr.ifr_name, IFF_MULTICAST);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "-multicast")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_MULTICAST);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "allmulti")) {
|
|
goterr |= set_flag(ifr.ifr_name, IFF_ALLMULTI);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "-allmulti")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_ALLMULTI);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "up")) {
|
|
goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "down")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_UP);
|
|
spp++;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(*spp, "metric")) {
|
|
if (*++spp == NULL)
|
|
usage(ifconfig_usage);
|
|
ifr.ifr_metric = atoi(*spp);
|
|
if (ioctl(sockfd, SIOCSIFMETRIC, &ifr) < 0) {
|
|
fprintf(stderr, "SIOCSIFMETRIC: %s\n", strerror(errno));
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "mtu")) {
|
|
if (*++spp == NULL)
|
|
usage(ifconfig_usage);
|
|
ifr.ifr_mtu = atoi(*spp);
|
|
if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
|
|
fprintf(stderr, "SIOCSIFMTU: %s\n", strerror(errno));
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
#ifdef SIOCSKEEPALIVE
|
|
if (!strcmp(*spp, "keepalive")) {
|
|
if (*++spp == NULL)
|
|
usage(ifconfig_usage);
|
|
ifr.ifr_data = (caddr_t) atoi(*spp);
|
|
if (ioctl(sockfd, SIOCSKEEPALIVE, &ifr) < 0) {
|
|
fprintf(stderr, "SIOCSKEEPALIVE: %s\n", strerror(errno));
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
#ifdef SIOCSOUTFILL
|
|
if (!strcmp(*spp, "outfill")) {
|
|
if (*++spp == NULL)
|
|
usage(ifconfig_usage);
|
|
ifr.ifr_data = (caddr_t) atoi(*spp);
|
|
if (ioctl(sockfd, SIOCSOUTFILL, &ifr) < 0) {
|
|
fprintf(stderr, "SIOCSOUTFILL: %s\n", strerror(errno));
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
if (!strcmp(*spp, "-broadcast")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_BROADCAST);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "broadcast")) {
|
|
if (*++spp != NULL) {
|
|
safe_strncpy(host, *spp, (sizeof host));
|
|
if (INET_resolve(host, &sa) < 0) {
|
|
goterr++;
|
|
spp++;
|
|
continue;
|
|
}
|
|
memcpy((char *) &ifr.ifr_broadaddr,
|
|
(char *) &sa,
|
|
sizeof(struct sockaddr));
|
|
if (ioctl(sockfd, SIOCSIFBRDADDR, &ifr) < 0) {
|
|
perror("SIOCSIFBRDADDR");
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
}
|
|
goterr |= set_flag(ifr.ifr_name, IFF_BROADCAST);
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "dstaddr")) {
|
|
if (*++spp == NULL)
|
|
usage(ifconfig_usage);
|
|
safe_strncpy(host, *spp, (sizeof host));
|
|
if (INET_resolve(host, &sa) < 0) {
|
|
goterr++;
|
|
spp++;
|
|
continue;
|
|
}
|
|
memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
|
|
sizeof(struct sockaddr));
|
|
if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
|
|
fprintf(stderr, "SIOCSIFDSTADDR: %s\n",
|
|
strerror(errno));
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "netmask")) {
|
|
if (*++spp == NULL || didnetmask)
|
|
usage(ifconfig_usage);
|
|
safe_strncpy(host, *spp, (sizeof host));
|
|
if (INET_resolve(host, &sa) < 0) {
|
|
goterr++;
|
|
spp++;
|
|
continue;
|
|
}
|
|
didnetmask++;
|
|
memcpy((char *) &ifr.ifr_netmask, (char *) &sa,
|
|
sizeof(struct sockaddr));
|
|
if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
|
|
perror("SIOCSIFNETMASK");
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(*spp, "-pointopoint")) {
|
|
goterr |= clr_flag(ifr.ifr_name, IFF_POINTOPOINT);
|
|
spp++;
|
|
continue;
|
|
}
|
|
if (!strcmp(*spp, "pointopoint")) {
|
|
if (*(spp + 1) != NULL) {
|
|
spp++;
|
|
safe_strncpy(host, *spp, (sizeof host));
|
|
if (INET_resolve(host, &sa)) {
|
|
goterr++;
|
|
spp++;
|
|
continue;
|
|
}
|
|
memcpy((char *) &ifr.ifr_dstaddr, (char *) &sa,
|
|
sizeof(struct sockaddr));
|
|
if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
|
|
perror("SIOCSIFDSTADDR");
|
|
goterr++;
|
|
}
|
|
}
|
|
goterr |= set_flag(ifr.ifr_name, IFF_POINTOPOINT);
|
|
spp++;
|
|
continue;
|
|
};
|
|
|
|
if (!strcmp(*spp, "hw")) {
|
|
if (*++spp == NULL || strcmp("ether", *spp)) {
|
|
usage(ifconfig_usage);
|
|
}
|
|
|
|
if (*++spp == NULL) {
|
|
/* silently ignore it if no address */
|
|
continue;
|
|
}
|
|
|
|
safe_strncpy(host, *spp, (sizeof host));
|
|
if (in_ether(host, &sa2) < 0) {
|
|
fprintf(stderr, "invalid hw-addr %s\n", host);
|
|
goterr++;
|
|
spp++;
|
|
continue;
|
|
}
|
|
memcpy((char *) &ifr.ifr_hwaddr, (char *) &sa2,
|
|
sizeof(struct sockaddr));
|
|
if (ioctl(sockfd, SIOCSIFHWADDR, &ifr) < 0) {
|
|
perror("SIOCSIFHWADDR");
|
|
goterr++;
|
|
}
|
|
spp++;
|
|
continue;
|
|
}
|
|
|
|
/* If the next argument is a valid hostname, assume OK. */
|
|
safe_strncpy(host, *spp, (sizeof host));
|
|
|
|
if (INET_resolve(host, &sa) < 0) {
|
|
usage(ifconfig_usage);
|
|
}
|
|
memcpy((char *) &ifr.ifr_addr,
|
|
(char *) &sa, sizeof(struct sockaddr));
|
|
|
|
r = ioctl(sockfd, SIOCSIFADDR, &ifr);
|
|
|
|
if (r < 0) {
|
|
perror("SIOCSIFADDR");
|
|
goterr++;
|
|
}
|
|
|
|
/*
|
|
* Don't do the set_flag() if the address is an alias with a - at the
|
|
* end, since it's deleted already! - Roman
|
|
*
|
|
* Should really use regex.h here, not sure though how well it'll go
|
|
* with the cross-platform support etc.
|
|
*/
|
|
{
|
|
char *ptr;
|
|
short int found_colon = 0;
|
|
for (ptr = ifr.ifr_name; *ptr; ptr++ )
|
|
if (*ptr == ':') found_colon++;
|
|
|
|
if (!(found_colon && *(ptr - 1) == '-'))
|
|
goterr |= set_flag(ifr.ifr_name, (IFF_UP | IFF_RUNNING));
|
|
}
|
|
|
|
spp++;
|
|
|
|
} /* end of while-loop */
|
|
|
|
exit(0);
|
|
}
|
|
|