busybox/networking/ifconfig.c

/* vi: set sw=4 ts=4: */
/* 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>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/*
 * 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.
 *
 * 2002-04-20
 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
 */

#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#if defined(__GLIBC__) && __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
#include <netpacket/packet.h>
#include <net/ethernet.h>
#else
#include <sys/types.h>
#include <netinet/if_ether.h>
#endif
#include "inet_common.h"
#include "busybox.h"

#if ENABLE_FEATURE_IFCONFIG_SLIP
# include <net/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

#if ENABLE_FEATURE_IPV6
struct in6_ifreq {
	struct in6_addr ifr6_addr;
	uint32_t ifr6_prefixlen;
	int ifr6_ifindex;
};
#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. */
#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
#define A_HOSTNAME      0x100	/* Set if it is ip addr. */
#define A_BROADCAST     0x200	/* Set if it is broadcast addr. */
#else
#define A_HOSTNAME          0
#define A_BROADCAST         0
#endif

/*
 * 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_ULONG)
#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 | A_BROADCAST)
#define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
#define ARG_POINTOPOINT  (A_ARG_REQ | 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 | A_HOSTNAME)
#define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)


/*
 * Set up the tables.  Warning!  They must have corresponding order!
 */

struct arg1opt {
	const char *name;
	int selector;
	unsigned short ifr_offset;
};

struct options {
	const char *name;
#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
	const unsigned int flags:6;
	const unsigned int arg_flags:10;
#else
	const unsigned char flags;
	const unsigned char arg_flags;
#endif
	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)},
#if ENABLE_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
#if ENABLE_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. */
#if ENABLE_FEATURE_IPV6
	{"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
	{"SIOCDIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
#endif
	{"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},
#if ENABLE_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
#if ENABLE_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
#if ENABLE_FEATURE_IPV6
	{"add",         N_ARG,         ARG_ADD_DEL,     0},
	{"del",         N_ARG,         ARG_ADD_DEL,     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.
 */

#if ENABLE_FEATURE_IFCONFIG_HW
static int in_ether(const char *bufp, struct sockaddr *sap);
#endif

/*
 * Our main function.
 */

int ifconfig_main(int argc, char **argv)
{
	struct ifreq ifr;
	struct sockaddr_in sai;
#if ENABLE_FEATURE_IPV6
	struct sockaddr_in6 sai6;
#endif
#if ENABLE_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 selector;
#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
	unsigned int mask;
	unsigned int did_flags;
	unsigned int sai_hostname, sai_netmask;
#else
	unsigned char mask;
	unsigned char did_flags;
#endif
	char *p;
	/*char host[128];*/
	const char *host = NULL; /* make gcc happy */

	did_flags = 0;
#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
	sai_hostname = 0;
	sai_netmask = 0;
#endif

	/* skip argv[0] */
	++argv;
	--argc;

#if ENABLE_FEATURE_IFCONFIG_STATUS
	if (argc > 0 && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
		interface_opt_a = 1;
		--argc;
		++argv;
	}
#endif

	if (argc <= 1) {
#if ENABLE_FEATURE_IFCONFIG_STATUS
		return display_interfaces(argc ? *argv : NULL);
#else
		bb_error_msg_and_die("no support for status display");
#endif
	}

	/* Create a channel to the NET kernel. */
	sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);

	/* 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... */
				mask &= op->flags;
				if (mask)	/* set the mask and go. */
					goto FOUND_ARG;
				/* If we get here, there was a valid arg with an */
				/* invalid '-' prefix. */
				bb_error_msg_and_die("bad: '%s'", p-1);
			}
		}

		/* 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)
				bb_show_usage();
			if (*++argv == NULL) {
				if (mask & A_ARG_REQ)
					bb_show_usage();
				--argv;
				mask &= A_SET_AFTER;	/* just for broadcast */
			} else {	/* got an arg so process it */
 HOSTNAME:
				did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
				if (mask & A_CAST_HOST_COPY) {
#if ENABLE_FEATURE_IFCONFIG_HW
					if (mask & A_CAST_RESOLVE) {
#endif
#if ENABLE_FEATURE_IPV6
						char *prefix;
						int prefix_len = 0;
#endif
						/*safe_strncpy(host, *argv, (sizeof host));*/
						host = *argv;
#if ENABLE_FEATURE_IPV6
						prefix = strchr(host, '/');
						if (prefix) {
							prefix_len = xatou_range(prefix + 1, 0, 128);
							*prefix = '\0';
						}
#endif
						sai.sin_family = AF_INET;
						sai.sin_port = 0;
						if (!strcmp(host, bb_str_default)) {
							/* Default is special, meaning 0.0.0.0. */
							sai.sin_addr.s_addr = INADDR_ANY;
						}
#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
						else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
						 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
						) {
							/* + is special, meaning broadcast is derived. */
							sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
						}
#endif
#if ENABLE_FEATURE_IPV6
						else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
							int sockfd6;
							struct in6_ifreq ifr6;

							memcpy((char *) &ifr6.ifr6_addr,
									(char *) &sai6.sin6_addr,
									sizeof(struct in6_addr));

							/* Create a channel to the NET kernel. */
							sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
							if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0)
								bb_perror_msg_and_die("SIOGIFINDEX");
							ifr6.ifr6_ifindex = ifr.ifr_ifindex;
							ifr6.ifr6_prefixlen = prefix_len;
							if (ioctl(sockfd6, a1op->selector, &ifr6) < 0)
								bb_perror_msg_and_die(a1op->name);
							continue;
						}
#endif
						else if (inet_aton(host, &sai.sin_addr) == 0) {
							/* It's not a dotted quad. */
							struct hostent *hp = xgethostbyname(host);
							memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0],
									sizeof(struct in_addr));
						}
#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
						if (mask & A_HOSTNAME)
							sai_hostname = sai.sin_addr.s_addr;
						if (mask & A_NETMASK)
							sai_netmask = sai.sin_addr.s_addr;
#endif
						p = (char *) &sai;
#if ENABLE_FEATURE_IFCONFIG_HW
					} else {	/* A_CAST_HOST_COPY_IN_ETHER */
						/* This is the "hw" arg case. */
						if (strcmp("ether", *argv) || !*++argv)
							bb_show_usage();
						/*safe_strncpy(host, *argv, sizeof(host));*/
						host = *argv;
						if (in_ether(host, &sa))
							bb_error_msg_and_die("invalid hw-addr %s", host);
						p = (char *) &sa;
					}
#endif
					memcpy( (((char *)&ifr) + a1op->ifr_offset),
						   p, sizeof(struct sockaddr));
				} else {
					/* FIXME: error check?? */
					unsigned long i = strtoul(*argv, NULL, 0);
					p = ((char *)&ifr) + a1op->ifr_offset;
#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
					if (mask & A_MAP_TYPE) {
						if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0)
							bb_perror_msg_and_die("SIOCGIFMAP");
						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)
					bb_perror_msg_and_die(a1op->name);
#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)
			bb_perror_msg_and_die("SIOCGIFFLAGS");
		selector = op->selector;
		if (mask & SET_MASK)
			ifr.ifr_flags |= selector;
		else
			ifr.ifr_flags &= ~selector;
		if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0)
			bb_perror_msg_and_die("SIOCSIFFLAGS");
	} /* while () */

	if (ENABLE_FEATURE_CLEAN_UP)
		close(sockfd);
	return 0;
}

#if ENABLE_FEATURE_IFCONFIG_HW
/* Input an Ethernet address and convert to binary. */
static int in_ether(const char *bufp, struct sockaddr *sap)
{
	char *ptr;
	int i, j;
	unsigned char val;
	unsigned char c;

	sap->sa_family = ARPHRD_ETHER;
	ptr = sap->sa_data;

	i = 0;
	do {
		j = val = 0;

		/* We might get a semicolon here - not required. */
		if (i && (*bufp == ':')) {
			bufp++;
		}

		do {
			c = *bufp;
			if (((unsigned char)(c - '0')) <= 9) {
				c -= '0';
			} else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
				c = (c|0x20) - ('a'-10);
			} else if (j && (c == ':' || c == 0)) {
				break;
			} else {
				return -1;
			}
			++bufp;
			val <<= 4;
			val += c;
		} while (++j < 2);
		*ptr++ = val;
	} while (++i < ETH_ALEN);

	return *bufp; /* Error if we don't end at end of string. */
}
#endif
1	/* vi: set sw=4 ts=4: */
2	/* ifconfig
3	*
4	* Similar to the standard Unix ifconfig, but with only the necessary
5	* parts for AF_INET, and without any printing of if info (for now).
6	*
7	* Bjorn Wesen, Axis Communications AB
8	*
9	*
10	* Authors of the original ifconfig was:
11	* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
12	*
13	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14	*/
15
16	/*
17	* Heavily modified by Manuel Novoa III Mar 6, 2001
18	*
19	* From initial port to busybox, removed most of the redundancy by
20	* converting to a table-driven approach. Added several (optional)
21	* args missing from initial port.
22	*
23	* Still missing: media, tunnel.
24	*
25	* 2002-04-20
26	* IPV6 support added by Bart Visscher <magick@linux-fan.com>
27	*/
28
29	#include <net/if.h>
30	#include <net/if_arp.h>
31	#include <netinet/in.h>
32	#if defined(__GLIBC__) && __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
33	#include <netpacket/packet.h>
34	#include <net/ethernet.h>
35	#else
36	#include <sys/types.h>
37	#include <netinet/if_ether.h>
38	#endif
39	#include "inet_common.h"
40	#include "busybox.h"
41
42	#if ENABLE_FEATURE_IFCONFIG_SLIP
43	# include <net/if_slip.h>
44	#endif
45
46	/* I don't know if this is needed for busybox or not. Anyone? */
47	#define QUESTIONABLE_ALIAS_CASE
48
49
50	/* Defines for glibc2.0 users. */
51	#ifndef SIOCSIFTXQLEN
52	# define SIOCSIFTXQLEN 0x8943
53	# define SIOCGIFTXQLEN 0x8942
54	#endif
55
56	/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
57	#ifndef ifr_qlen
58	# define ifr_qlen ifr_ifru.ifru_mtu
59	#endif
60
61	#ifndef IFF_DYNAMIC
62	# define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
63	#endif
64
65	#if ENABLE_FEATURE_IPV6
66	struct in6_ifreq {
67	struct in6_addr ifr6_addr;
68	uint32_t ifr6_prefixlen;
69	int ifr6_ifindex;
70	};
71	#endif
72
73	/*
74	* Here are the bit masks for the "flags" member of struct options below.
75	* N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
76	* CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
77	*/
78	#define N_CLR 0x01
79	#define M_CLR 0x02
80	#define N_SET 0x04
81	#define M_SET 0x08
82	#define N_ARG 0x10
83	#define M_ARG 0x20
84
85	#define M_MASK (M_CLR \| M_SET \| M_ARG)
86	#define N_MASK (N_CLR \| N_SET \| N_ARG)
87	#define SET_MASK (N_SET \| M_SET)
88	#define CLR_MASK (N_CLR \| M_CLR)
89	#define SET_CLR_MASK (SET_MASK \| CLR_MASK)
90	#define ARG_MASK (M_ARG \| N_ARG)
91
92	/*
93	* Here are the bit masks for the "arg_flags" member of struct options below.
94	*/
95
96	/*
97	* cast type:
98	* 00 int
99	* 01 char *
100	* 02 HOST_COPY in_ether
101	* 03 HOST_COPY INET_resolve
102	*/
103	#define A_CAST_TYPE 0x03
104	/*
105	* map type:
106	* 00 not a map type (mem_start, io_addr, irq)
107	* 04 memstart (unsigned long)
108	* 08 io_addr (unsigned short)
109	* 0C irq (unsigned char)
110	*/
111	#define A_MAP_TYPE 0x0C
112	#define A_ARG_REQ 0x10 /* Set if an arg is required. */
113	#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
114	#define A_SET_AFTER 0x40 /* Set a flag at the end. */
115	#define A_COLON_CHK 0x80 /* Is this needed? See below. */
116	#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
117	#define A_HOSTNAME 0x100 /* Set if it is ip addr. */
118	#define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
119	#else
120	#define A_HOSTNAME 0
121	#define A_BROADCAST 0
122	#endif
123
124	/*
125	* These defines are for dealing with the A_CAST_TYPE field.
126	*/
127	#define A_CAST_CHAR_PTR 0x01
128	#define A_CAST_RESOLVE 0x01
129	#define A_CAST_HOST_COPY 0x02
130	#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
131	#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY \| A_CAST_RESOLVE)
132
133	/*
134	* These defines are for dealing with the A_MAP_TYPE field.
135	*/
136	#define A_MAP_ULONG 0x04 /* memstart */
137	#define A_MAP_USHORT 0x08 /* io_addr */
138	#define A_MAP_UCHAR 0x0C /* irq */
139
140	/*
141	* Define the bit masks signifying which operations to perform for each arg.
142	*/
143
144	#define ARG_METRIC (A_ARG_REQ /\| A_CAST_INT/)
145	#define ARG_MTU (A_ARG_REQ /\| A_CAST_INT/)
146	#define ARG_TXQUEUELEN (A_ARG_REQ /\| A_CAST_INT/)
147	#define ARG_MEM_START (A_ARG_REQ \| A_MAP_ULONG)
148	#define ARG_IO_ADDR (A_ARG_REQ \| A_MAP_ULONG)
149	#define ARG_IRQ (A_ARG_REQ \| A_MAP_UCHAR)
150	#define ARG_DSTADDR (A_ARG_REQ \| A_CAST_HOST_COPY_RESOLVE)
151	#define ARG_NETMASK (A_ARG_REQ \| A_CAST_HOST_COPY_RESOLVE \| A_NETMASK)
152	#define ARG_BROADCAST (A_ARG_REQ \| A_CAST_HOST_COPY_RESOLVE \| A_SET_AFTER \| A_BROADCAST)
153	#define ARG_HW (A_ARG_REQ \| A_CAST_HOST_COPY_IN_ETHER)
154	#define ARG_POINTOPOINT (A_ARG_REQ \| A_CAST_HOST_COPY_RESOLVE \| A_SET_AFTER)
155	#define ARG_KEEPALIVE (A_ARG_REQ \| A_CAST_CHAR_PTR)
156	#define ARG_OUTFILL (A_ARG_REQ \| A_CAST_CHAR_PTR)
157	#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE \| A_SET_AFTER \| A_COLON_CHK \| A_HOSTNAME)
158	#define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE \| A_SET_AFTER)
159
160
161	/*
162	* Set up the tables. Warning! They must have corresponding order!
163	*/
164
165	struct arg1opt {
166	const char *name;
167	int selector;
168	unsigned short ifr_offset;
169	};
170
171	struct options {
172	const char *name;
173	#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
174	const unsigned int flags:6;
175	const unsigned int arg_flags:10;
176	#else
177	const unsigned char flags;
178	const unsigned char arg_flags;
179	#endif
180	const unsigned short selector;
181	};
182
183	#define ifreq_offsetof(x) offsetof(struct ifreq, x)
184
185	static const struct arg1opt Arg1Opt[] = {
186	{"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
187	{"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
188	{"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
189	{"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
190	{"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
191	{"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
192	#if ENABLE_FEATURE_IFCONFIG_HW
193	{"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
194	#endif
195	{"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
196	#ifdef SIOCSKEEPALIVE
197	{"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
198	#endif
199	#ifdef SIOCSOUTFILL
200	{"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
201	#endif
202	#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
203	{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
204	{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
205	{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
206	#endif
207	/* Last entry if for unmatched (possibly hostname) arg. */
208	#if ENABLE_FEATURE_IPV6
209	{"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
210	{"SIOCDIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
211	#endif
212	{"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
213	};
214
215	static const struct options OptArray[] = {
216	{"metric", N_ARG, ARG_METRIC, 0},
217	{"mtu", N_ARG, ARG_MTU, 0},
218	{"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
219	{"dstaddr", N_ARG, ARG_DSTADDR, 0},
220	{"netmask", N_ARG, ARG_NETMASK, 0},
221	{"broadcast", N_ARG \| M_CLR, ARG_BROADCAST, IFF_BROADCAST},
222	#if ENABLE_FEATURE_IFCONFIG_HW
223	{"hw", N_ARG, ARG_HW, 0},
224	#endif
225	{"pointopoint", N_ARG \| M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
226	#ifdef SIOCSKEEPALIVE
227	{"keepalive", N_ARG, ARG_KEEPALIVE, 0},
228	#endif
229	#ifdef SIOCSOUTFILL
230	{"outfill", N_ARG, ARG_OUTFILL, 0},
231	#endif
232	#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
233	{"mem_start", N_ARG, ARG_MEM_START, 0},
234	{"io_addr", N_ARG, ARG_IO_ADDR, 0},
235	{"irq", N_ARG, ARG_IRQ, 0},
236	#endif
237	#if ENABLE_FEATURE_IPV6
238	{"add", N_ARG, ARG_ADD_DEL, 0},
239	{"del", N_ARG, ARG_ADD_DEL, 0},
240	#endif
241	{"arp", N_CLR \| M_SET, 0, IFF_NOARP},
242	{"trailers", N_CLR \| M_SET, 0, IFF_NOTRAILERS},
243	{"promisc", N_SET \| M_CLR, 0, IFF_PROMISC},
244	{"multicast", N_SET \| M_CLR, 0, IFF_MULTICAST},
245	{"allmulti", N_SET \| M_CLR, 0, IFF_ALLMULTI},
246	{"dynamic", N_SET \| M_CLR, 0, IFF_DYNAMIC},
247	{"up", N_SET, 0, (IFF_UP \| IFF_RUNNING)},
248	{"down", N_CLR, 0, IFF_UP},
249	{NULL, 0, ARG_HOSTNAME, (IFF_UP \| IFF_RUNNING)}
250	};
251
252	/*
253	* A couple of prototypes.
254	*/
255
256	#if ENABLE_FEATURE_IFCONFIG_HW
257	static int in_ether(const char bufp, struct sockaddr sap);
258	#endif
259
260	/*
261	* Our main function.
262	*/
263
264	int ifconfig_main(int argc, char **argv)
265	{
266	struct ifreq ifr;
267	struct sockaddr_in sai;
268	#if ENABLE_FEATURE_IPV6
269	struct sockaddr_in6 sai6;
270	#endif
271	#if ENABLE_FEATURE_IFCONFIG_HW
272	struct sockaddr sa;
273	#endif
274	const struct arg1opt *a1op;
275	const struct options *op;
276	int sockfd; /* socket fd we use to manipulate stuff with */
277	int selector;
278	#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
279	unsigned int mask;
280	unsigned int did_flags;
281	unsigned int sai_hostname, sai_netmask;
282	#else
283	unsigned char mask;
284	unsigned char did_flags;
285	#endif
286	char *p;
287	/char host[128];/
288	const char host = NULL; / make gcc happy */
289
290	did_flags = 0;
291	#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
292	sai_hostname = 0;
293	sai_netmask = 0;
294	#endif
295
296	/* skip argv[0] */
297	++argv;
298	--argc;
299
300	#if ENABLE_FEATURE_IFCONFIG_STATUS
301	if (argc > 0 && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
302	interface_opt_a = 1;
303	--argc;
304	++argv;
305	}
306	#endif
307
308	if (argc <= 1) {
309	#if ENABLE_FEATURE_IFCONFIG_STATUS
310	return display_interfaces(argc ? *argv : NULL);
311	#else
312	bb_error_msg_and_die("no support for status display");
313	#endif
314	}
315
316	/* Create a channel to the NET kernel. */
317	sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
318
319	/* get interface name */
320	safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
321
322	/* Process the remaining arguments. */
323	while (++argv != (char ) NULL) {
324	p = *argv;
325	mask = N_MASK;
326	if (p == '-') { / If the arg starts with '-'... */
327	++p; /* advance past it and */
328	mask = M_MASK; /* set the appropriate mask. */
329	}
330	for (op = OptArray; op->name; op++) { /* Find table entry. */
331	if (strcmp(p, op->name) == 0) { /* If name matches... */
332	mask &= op->flags;
333	if (mask) /* set the mask and go. */
334	goto FOUND_ARG;
335	/* If we get here, there was a valid arg with an */
336	/* invalid '-' prefix. */
337	bb_error_msg_and_die("bad: '%s'", p-1);
338	}
339	}
340
341	/* We fell through, so treat as possible hostname. */
342	a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
343	mask = op->arg_flags;
344	goto HOSTNAME;
345
346	FOUND_ARG:
347	if (mask & ARG_MASK) {
348	mask = op->arg_flags;
349	a1op = Arg1Opt + (op - OptArray);
350	if (mask & A_NETMASK & did_flags)
351	bb_show_usage();
352	if (*++argv == NULL) {
353	if (mask & A_ARG_REQ)
354	bb_show_usage();
355	--argv;
356	mask &= A_SET_AFTER; /* just for broadcast */
357	} else { /* got an arg so process it */
358	HOSTNAME:
359	did_flags \|= (mask & (A_NETMASK\|A_HOSTNAME));
360	if (mask & A_CAST_HOST_COPY) {
361	#if ENABLE_FEATURE_IFCONFIG_HW
362	if (mask & A_CAST_RESOLVE) {
363	#endif
364	#if ENABLE_FEATURE_IPV6
365	char *prefix;
366	int prefix_len = 0;
367	#endif
368	/safe_strncpy(host, argv, (sizeof host));*/
369	host = *argv;
370	#if ENABLE_FEATURE_IPV6
371	prefix = strchr(host, '/');
372	if (prefix) {
373	prefix_len = xatou_range(prefix + 1, 0, 128);
374	*prefix = '\0';
375	}
376	#endif
377	sai.sin_family = AF_INET;
378	sai.sin_port = 0;
379	if (!strcmp(host, bb_str_default)) {
380	/* Default is special, meaning 0.0.0.0. */
381	sai.sin_addr.s_addr = INADDR_ANY;
382	}
383	#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
384	else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
385	&& (did_flags & (A_NETMASK\|A_HOSTNAME)) == (A_NETMASK\|A_HOSTNAME)
386	) {
387	/* + is special, meaning broadcast is derived. */
388	sai.sin_addr.s_addr = (~sai_netmask) \| (sai_hostname & sai_netmask);
389	}
390	#endif
391	#if ENABLE_FEATURE_IPV6
392	else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
393	int sockfd6;
394	struct in6_ifreq ifr6;
395
396	memcpy((char *) &ifr6.ifr6_addr,
397	(char *) &sai6.sin6_addr,
398	sizeof(struct in6_addr));
399
400	/* Create a channel to the NET kernel. */
401	sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
402	if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0)
403	bb_perror_msg_and_die("SIOGIFINDEX");
404	ifr6.ifr6_ifindex = ifr.ifr_ifindex;
405	ifr6.ifr6_prefixlen = prefix_len;
406	if (ioctl(sockfd6, a1op->selector, &ifr6) < 0)
407	bb_perror_msg_and_die(a1op->name);
408	continue;
409	}
410	#endif
411	else if (inet_aton(host, &sai.sin_addr) == 0) {
412	/* It's not a dotted quad. */
413	struct hostent *hp = xgethostbyname(host);
414	memcpy((char ) &sai.sin_addr, (char ) hp->h_addr_list[0],
415	sizeof(struct in_addr));
416	}
417	#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
418	if (mask & A_HOSTNAME)
419	sai_hostname = sai.sin_addr.s_addr;
420	if (mask & A_NETMASK)
421	sai_netmask = sai.sin_addr.s_addr;
422	#endif
423	p = (char *) &sai;
424	#if ENABLE_FEATURE_IFCONFIG_HW
425	} else { /* A_CAST_HOST_COPY_IN_ETHER */
426	/* This is the "hw" arg case. */
427	if (strcmp("ether", argv) \|\| !++argv)
428	bb_show_usage();
429	/safe_strncpy(host, argv, sizeof(host));*/
430	host = *argv;
431	if (in_ether(host, &sa))
432	bb_error_msg_and_die("invalid hw-addr %s", host);
433	p = (char *) &sa;
434	}
435	#endif
436	memcpy( (((char *)&ifr) + a1op->ifr_offset),
437	p, sizeof(struct sockaddr));
438	} else {
439	/* FIXME: error check?? */
440	unsigned long i = strtoul(*argv, NULL, 0);
441	p = ((char *)&ifr) + a1op->ifr_offset;
442	#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
443	if (mask & A_MAP_TYPE) {
444	if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0)
445	bb_perror_msg_and_die("SIOCGIFMAP");
446	if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
447	((unsigned char ) p) = i;
448	else if (mask & A_MAP_USHORT)
449	((unsigned short ) p) = i;
450	else
451	((unsigned long ) p) = i;
452	} else
453	#endif
454	if (mask & A_CAST_CHAR_PTR)
455	((caddr_t ) p) = (caddr_t) i;
456	else /* A_CAST_INT */
457	((int ) p) = i;
458	}
459
460	if (ioctl(sockfd, a1op->selector, &ifr) < 0)
461	bb_perror_msg_and_die(a1op->name);
462	#ifdef QUESTIONABLE_ALIAS_CASE
463	if (mask & A_COLON_CHK) {
464	/*
465	* Don't do the set_flag() if the address is an alias with
466	* a '-' at the end, since it's deleted already! - Roman
467	*
468	* Should really use regex.h here, not sure though how well
469	* it'll go with the cross-platform support etc.
470	*/
471	char *ptr;
472	short int found_colon = 0;
473	for (ptr = ifr.ifr_name; *ptr; ptr++)
474	if (*ptr == ':')
475	found_colon++;
476	if (found_colon && ptr[-1] == '-')
477	continue;
478	}
479	#endif
480	}
481	if (!(mask & A_SET_AFTER))
482	continue;
483	mask = N_SET;
484	}
485
486	if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0)
487	bb_perror_msg_and_die("SIOCGIFFLAGS");
488	selector = op->selector;
489	if (mask & SET_MASK)
490	ifr.ifr_flags \|= selector;
491	else
492	ifr.ifr_flags &= ~selector;
493	if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0)
494	bb_perror_msg_and_die("SIOCSIFFLAGS");
495	} /* while () */
496
497	if (ENABLE_FEATURE_CLEAN_UP)
498	close(sockfd);
499	return 0;
500	}
501
502	#if ENABLE_FEATURE_IFCONFIG_HW
503	/* Input an Ethernet address and convert to binary. */
504	static int in_ether(const char bufp, struct sockaddr sap)
505	{
506	char *ptr;
507	int i, j;
508	unsigned char val;
509	unsigned char c;
510
511	sap->sa_family = ARPHRD_ETHER;
512	ptr = sap->sa_data;
513
514	i = 0;
515	do {
516	j = val = 0;
517
518	/* We might get a semicolon here - not required. */
519	if (i && (*bufp == ':')) {
520	bufp++;
521	}
522
523	do {
524	c = *bufp;
525	if (((unsigned char)(c - '0')) <= 9) {
526	c -= '0';
527	} else if (((unsigned char)((c\|0x20) - 'a')) <= 5) {
528	c = (c\|0x20) - ('a'-10);
529	} else if (j && (c == ':' \|\| c == 0)) {
530	break;
531	} else {
532	return -1;
533	}
534	++bufp;
535	val <<= 4;
536	val += c;
537	} while (++j < 2);
538	*ptr++ = val;
539	} while (++i < ETH_ALEN);
540
541	return bufp; / Error if we don't end at end of string. */
542	}
543	#endif