mirror of
https://github.com/sheumann/hush.git
synced 2024-12-23 05:29:58 +00:00
4fb0b51703
by ifconfig that someone had submitted. It fixes 1 bug, gets rid of the excessive bloating of a structure that is used in a static const array, and removes the implicit struct copys by keeping only the int type needed. It also turns this into a configurable feature (off by default).
493 lines
13 KiB
C
493 lines
13 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 1.12 2001/08/10 06:02:23 mjn3 Exp $
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Heavily modified by Manuel Novoa III Mar 6, 2001
|
|
*
|
|
* From initial port to busybox, removed most of the redundancy by
|
|
* converting to a table-driven approach. Added several (optional)
|
|
* args missing from initial port.
|
|
*
|
|
* Still missing: media, tunnel.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h> // strcmp and friends
|
|
#include <ctype.h> // isdigit and friends
|
|
#include <stddef.h> /* offsetof */
|
|
#include <sys/types.h>
|
|
#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"
|
|
|
|
#ifdef BB_FEATURE_IFCONFIG_SLIP
|
|
#include <linux/if_slip.h>
|
|
#endif
|
|
|
|
/* I don't know if this is needed for busybox or not. Anyone? */
|
|
#define QUESTIONABLE_ALIAS_CASE
|
|
|
|
|
|
/* Defines for glibc2.0 users. */
|
|
#ifndef SIOCSIFTXQLEN
|
|
#define SIOCSIFTXQLEN 0x8943
|
|
#define SIOCGIFTXQLEN 0x8942
|
|
#endif
|
|
|
|
/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
|
|
#ifndef ifr_qlen
|
|
#define ifr_qlen ifr_ifru.ifru_mtu
|
|
#endif
|
|
|
|
#ifndef IFF_DYNAMIC
|
|
#define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
|
|
#endif
|
|
|
|
/*
|
|
* Here are the bit masks for the "flags" member of struct options below.
|
|
* N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
|
|
* CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
|
|
*/
|
|
#define N_CLR 0x01
|
|
#define M_CLR 0x02
|
|
#define N_SET 0x04
|
|
#define M_SET 0x08
|
|
#define N_ARG 0x10
|
|
#define M_ARG 0x20
|
|
|
|
#define M_MASK (M_CLR | M_SET | M_ARG)
|
|
#define N_MASK (N_CLR | N_SET | N_ARG)
|
|
#define SET_MASK (N_SET | M_SET)
|
|
#define CLR_MASK (N_CLR | M_CLR)
|
|
#define SET_CLR_MASK (SET_MASK | CLR_MASK)
|
|
#define ARG_MASK (M_ARG | N_ARG)
|
|
|
|
/*
|
|
* Here are the bit masks for the "arg_flags" member of struct options below.
|
|
*/
|
|
|
|
/*
|
|
* cast type:
|
|
* 00 int
|
|
* 01 char *
|
|
* 02 HOST_COPY in_ether
|
|
* 03 HOST_COPY INET_resolve
|
|
*/
|
|
#define A_CAST_TYPE 0x03
|
|
/*
|
|
* map type:
|
|
* 00 not a map type (mem_start, io_addr, irq)
|
|
* 04 memstart (unsigned long)
|
|
* 08 io_addr (unsigned short)
|
|
* 0C irq (unsigned char)
|
|
*/
|
|
#define A_MAP_TYPE 0x0C
|
|
#define A_ARG_REQ 0x10 /* Set if an arg is required. */
|
|
#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
|
|
#define A_SET_AFTER 0x40 /* Set a flag at the end. */
|
|
#define A_COLON_CHK 0x80 /* Is this needed? See below. */
|
|
|
|
/*
|
|
* These defines are for dealing with the A_CAST_TYPE field.
|
|
*/
|
|
#define A_CAST_CHAR_PTR 0x01
|
|
#define A_CAST_RESOLVE 0x01
|
|
#define A_CAST_HOST_COPY 0x02
|
|
#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
|
|
#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
|
|
|
|
/*
|
|
* These defines are for dealing with the A_MAP_TYPE field.
|
|
*/
|
|
#define A_MAP_ULONG 0x04 /* memstart */
|
|
#define A_MAP_USHORT 0x08 /* io_addr */
|
|
#define A_MAP_UCHAR 0x0C /* irq */
|
|
|
|
/*
|
|
* Define the bit masks signifying which operations to perform for each arg.
|
|
*/
|
|
|
|
#define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
|
|
#define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
|
|
#define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
|
|
#define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
|
|
#define ARG_IO_ADDR (A_ARG_REQ | A_MAP_USHORT)
|
|
#define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
|
|
#define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
|
|
#define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
|
|
#define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
|
|
#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
|
|
#define ARG_POINTOPOINT (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
|
|
#define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
|
|
#define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
|
|
#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK)
|
|
|
|
|
|
/*
|
|
* Set up the tables. Warning! They must have corresponding order!
|
|
*/
|
|
|
|
struct arg1opt {
|
|
const char *name;
|
|
unsigned short selector;
|
|
unsigned short ifr_offset;
|
|
};
|
|
|
|
struct options {
|
|
const char *name;
|
|
const unsigned char flags;
|
|
const unsigned char arg_flags;
|
|
const unsigned short selector;
|
|
};
|
|
|
|
#define ifreq_offsetof(x) offsetof(struct ifreq, x)
|
|
|
|
static const struct arg1opt Arg1Opt[] = {
|
|
{"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
|
|
{"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
|
|
{"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
|
|
{"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
|
|
{"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
|
|
{"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
{"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
|
|
#endif
|
|
{"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
|
|
#ifdef SIOCSKEEPALIVE
|
|
{"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
|
|
#endif
|
|
#ifdef SIOCSOUTFILL
|
|
{"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
|
|
#endif
|
|
#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
|
|
{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
|
|
{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
|
|
{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
|
|
#endif
|
|
/* Last entry if for unmatched (possibly hostname) arg. */
|
|
{"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
|
|
};
|
|
|
|
static const struct options OptArray[] = {
|
|
{"metric", N_ARG, ARG_METRIC, 0},
|
|
{"mtu", N_ARG, ARG_MTU, 0},
|
|
{"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
|
|
{"dstaddr", N_ARG, ARG_DSTADDR, 0},
|
|
{"netmask", N_ARG, ARG_NETMASK, 0},
|
|
{"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
{"hw", N_ARG, ARG_HW, 0},
|
|
#endif
|
|
{"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
|
|
#ifdef SIOCSKEEPALIVE
|
|
{"keepalive", N_ARG, ARG_KEEPALIVE, 0},
|
|
#endif
|
|
#ifdef SIOCSOUTFILL
|
|
{"outfill", N_ARG, ARG_OUTFILL, 0},
|
|
#endif
|
|
#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
|
|
{"mem_start", N_ARG, ARG_MEM_START, 0},
|
|
{"io_addr", N_ARG, ARG_IO_ADDR, 0},
|
|
{"irq", N_ARG, ARG_IRQ, 0},
|
|
#endif
|
|
{"arp", N_CLR | M_SET, 0, IFF_NOARP},
|
|
{"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
|
|
{"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
|
|
{"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
|
|
{"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
|
|
{"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
|
|
{"up", N_SET , 0, (IFF_UP | IFF_RUNNING)},
|
|
{"down", N_CLR , 0, IFF_UP},
|
|
{ NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
|
|
};
|
|
|
|
/*
|
|
* A couple of prototypes.
|
|
*/
|
|
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
static int in_ether(char *bufp, struct sockaddr *sap);
|
|
#endif
|
|
|
|
#ifdef BB_FEATURE_IFCONFIG_STATUS
|
|
extern int interface_opt_a;
|
|
extern int display_interfaces(char *ifname);
|
|
#endif
|
|
|
|
/*
|
|
* Our main function.
|
|
*/
|
|
|
|
int ifconfig_main(int argc, char **argv)
|
|
{
|
|
struct ifreq ifr;
|
|
struct sockaddr_in sai;
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
struct sockaddr sa;
|
|
#endif
|
|
const struct arg1opt *a1op;
|
|
const struct options *op;
|
|
int sockfd; /* socket fd we use to manipulate stuff with */
|
|
int goterr;
|
|
int selector;
|
|
char *p;
|
|
char host[128];
|
|
unsigned char mask;
|
|
unsigned char did_flags;
|
|
|
|
goterr = 0;
|
|
did_flags = 0;
|
|
|
|
/* skip argv[0] */
|
|
++argv;
|
|
--argc;
|
|
|
|
#ifdef BB_FEATURE_IFCONFIG_STATUS
|
|
if ((argc > 0) && (strcmp(*argv,"-a") == 0)) {
|
|
interface_opt_a = 1;
|
|
--argc;
|
|
++argv;
|
|
}
|
|
#endif
|
|
|
|
if(argc <= 1) {
|
|
#ifdef BB_FEATURE_IFCONFIG_STATUS
|
|
return display_interfaces(argc ? *argv : NULL);
|
|
#else
|
|
error_msg_and_die( "ifconfig was not compiled with interface status display support.");
|
|
#endif
|
|
}
|
|
|
|
/* Create a channel to the NET kernel. */
|
|
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
|
|
perror_msg_and_die("socket");
|
|
}
|
|
|
|
/* get interface name */
|
|
safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
|
|
|
|
/* Process the remaining arguments. */
|
|
while (*++argv != (char *) NULL) {
|
|
p = *argv;
|
|
mask = N_MASK;
|
|
if (*p == '-') { /* If the arg starts with '-'... */
|
|
++p; /* advance past it and */
|
|
mask = M_MASK; /* set the appropriate mask. */
|
|
}
|
|
for (op = OptArray ; op->name ; op++) { /* Find table entry. */
|
|
if (strcmp(p,op->name) == 0) { /* If name matches... */
|
|
if ((mask &= op->flags)) { /* set the mask and go. */
|
|
goto FOUND_ARG;;
|
|
}
|
|
/* If we get here, there was a valid arg with an */
|
|
/* invalid '-' prefix. */
|
|
++goterr;
|
|
goto LOOP;
|
|
}
|
|
}
|
|
|
|
/* We fell through, so treat as possible hostname. */
|
|
a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
|
|
mask = op->arg_flags;
|
|
goto HOSTNAME;
|
|
|
|
FOUND_ARG:
|
|
if (mask & ARG_MASK) {
|
|
mask = op->arg_flags;
|
|
a1op = Arg1Opt + (op - OptArray);
|
|
if (mask & A_NETMASK & did_flags) {
|
|
show_usage();
|
|
}
|
|
if (*++argv == NULL) {
|
|
if (mask & A_ARG_REQ) {
|
|
show_usage();
|
|
} else {
|
|
--argv;
|
|
mask &= A_SET_AFTER; /* just for broadcast */
|
|
}
|
|
} else { /* got an arg so process it */
|
|
HOSTNAME:
|
|
did_flags |= (mask & A_NETMASK);
|
|
if (mask & A_CAST_HOST_COPY) {
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
if (mask & A_CAST_RESOLVE) {
|
|
#endif
|
|
safe_strncpy(host, *argv, (sizeof host));
|
|
sai.sin_family = AF_INET;
|
|
sai.sin_port = 0;
|
|
if (!strcmp(host, "default")) {
|
|
/* Default is special, meaning 0.0.0.0. */
|
|
sai.sin_addr.s_addr = INADDR_ANY;
|
|
} else if (inet_aton(host, &sai.sin_addr) == 0) {
|
|
/* It's not a dotted quad. */
|
|
++goterr;
|
|
continue;
|
|
}
|
|
p = (char *) &sai;
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
} else { /* A_CAST_HOST_COPY_IN_ETHER */
|
|
/* This is the "hw" arg case. */
|
|
if (strcmp("ether", *argv) || (*++argv == NULL)) {
|
|
show_usage();
|
|
}
|
|
safe_strncpy(host, *argv, (sizeof host));
|
|
if (in_ether(host, &sa)) {
|
|
fprintf(stderr, "invalid hw-addr %s\n", host);
|
|
++goterr;
|
|
continue;
|
|
}
|
|
p = (char *) &sa;
|
|
}
|
|
#endif
|
|
memcpy((((char *)(&ifr)) + a1op->ifr_offset),
|
|
p, sizeof(struct sockaddr));
|
|
} else {
|
|
unsigned int i = strtoul(*argv,NULL,0);
|
|
p = ((char *)(&ifr)) + a1op->ifr_offset;
|
|
#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
|
|
if (mask & A_MAP_TYPE) {
|
|
if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
|
|
++goterr;
|
|
continue;
|
|
}
|
|
if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
|
|
*((unsigned char *) p) = i;
|
|
} else if (mask & A_MAP_USHORT) {
|
|
*((unsigned short *) p) = i;
|
|
} else {
|
|
*((unsigned long *) p) = i;
|
|
}
|
|
} else
|
|
#endif
|
|
if (mask & A_CAST_CHAR_PTR) {
|
|
*((caddr_t *) p) = (caddr_t) i;
|
|
} else { /* A_CAST_INT */
|
|
*((int *) p) = i;
|
|
}
|
|
}
|
|
|
|
if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
|
|
perror(a1op->name);
|
|
++goterr;
|
|
continue;
|
|
}
|
|
|
|
#ifdef QUESTIONABLE_ALIAS_CASE
|
|
if (mask & A_COLON_CHK) {
|
|
/*
|
|
* 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) == '-') {
|
|
continue;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
if (!(mask & A_SET_AFTER)) {
|
|
continue;
|
|
}
|
|
mask = N_SET;
|
|
}
|
|
|
|
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
|
|
perror("SIOCGIFFLAGS");
|
|
++goterr;
|
|
} else {
|
|
selector = op->selector;
|
|
if (mask & SET_MASK) {
|
|
ifr.ifr_flags |= selector;
|
|
} else {
|
|
ifr.ifr_flags &= ~selector;
|
|
}
|
|
if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
|
|
perror("SIOCSIFFLAGS");
|
|
++goterr;
|
|
}
|
|
}
|
|
LOOP:
|
|
} /* end of while-loop */
|
|
|
|
return goterr;
|
|
}
|
|
|
|
#ifdef BB_FEATURE_IFCONFIG_HW
|
|
/* Input an Ethernet address and convert to binary. */
|
|
static int
|
|
in_ether(char *bufp, struct sockaddr *sap)
|
|
{
|
|
unsigned char *ptr;
|
|
int i, j;
|
|
unsigned char val;
|
|
unsigned char c;
|
|
|
|
sap->sa_family = ARPHRD_ETHER;
|
|
ptr = sap->sa_data;
|
|
|
|
for (i = 0 ; i < ETH_ALEN ; i++) {
|
|
val = 0;
|
|
|
|
/* We might get a semicolon here - not required. */
|
|
if (i && (*bufp == ':')) {
|
|
bufp++;
|
|
}
|
|
|
|
for (j=0 ; j<2 ; j++) {
|
|
c = *bufp;
|
|
if (c >= '0' && c <= '9') {
|
|
c -= '0';
|
|
} else if (c >= 'a' && c <= 'f') {
|
|
c -= ('a' - 10);
|
|
} else if (c >= 'A' && c <= 'F') {
|
|
c -= ('A' - 10);
|
|
} else if (j && (c == ':' || c == 0)) {
|
|
break;
|
|
} else {
|
|
return -1;
|
|
}
|
|
++bufp;
|
|
val <<= 4;
|
|
val += c;
|
|
}
|
|
*ptr++ = val;
|
|
}
|
|
|
|
return (int) (*bufp); /* Error if we don't end at end of string. */
|
|
}
|
|
#endif
|