busybox/ifconfig.c

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/* 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 1.3 2001/02/20 06:14:07 andersen Exp $
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*
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h> // strcmp and friends
#include <ctype.h> // isdigit and friends
#include <sys/types.h>
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#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>
#include "busybox.h"
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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) {
show_usage();
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}
/* 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)
show_usage();
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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)
show_usage();
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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)
show_usage();
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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)
show_usage();
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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)
show_usage();
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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)
show_usage();
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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)) {
show_usage();
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}
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) {
show_usage();
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}
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);
}