diff options
Diffstat (limited to 'busybox/networking/ifconfig.c')
| -rw-r--r-- | busybox/networking/ifconfig.c | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/busybox/networking/ifconfig.c b/busybox/networking/ifconfig.c new file mode 100644 index 0000000..4e3df29 --- /dev/null +++ b/busybox/networking/ifconfig.c @@ -0,0 +1,605 @@ +/* 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 1.30 2004/03/31 11:30:08 andersen 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. + * + * 2002-04-20 + * IPV6 support added by Bart Visscher <magick@linux-fan.com> + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> /* strcmp and friends */ +#include <ctype.h> /* isdigit and friends */ +#include <stddef.h> /* offsetof */ +#include <netdb.h> +#include <sys/ioctl.h> +#include <net/if.h> +#include <net/if_arp.h> +#include <netinet/in.h> +#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1 +#include <netpacket/packet.h> +#include <net/ethernet.h> +#else +#include <asm/types.h> +#include <linux/if_ether.h> +#endif +#include "inet_common.h" +#include "busybox.h" + +#ifdef CONFIG_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 + +#ifdef CONFIG_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. */ +#ifdef CONFIG_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; + unsigned short selector; + unsigned short ifr_offset; +}; + +struct options { + const char *name; +#ifdef CONFIG_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)}, +#ifdef CONFIG_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 CONFIG_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. */ +#ifdef CONFIG_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}, +#ifdef CONFIG_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 CONFIG_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 +#ifdef CONFIG_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. + */ + +#ifdef CONFIG_FEATURE_IFCONFIG_HW +static int in_ether(char *bufp, struct sockaddr *sap); +#endif + +#ifdef CONFIG_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 CONFIG_FEATURE_IPV6 + struct sockaddr_in6 sai6; +#endif +#ifdef CONFIG_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; +#ifdef CONFIG_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]; + + goterr = 0; + did_flags = 0; +#ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS + sai_hostname = 0; + sai_netmask = 0; +#endif + + /* skip argv[0] */ + ++argv; + --argc; + +#ifdef CONFIG_FEATURE_IFCONFIG_STATUS + if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) { + interface_opt_a = 1; + --argc; + ++argv; + } +#endif + + if (argc <= 1) { +#ifdef CONFIG_FEATURE_IFCONFIG_STATUS + return display_interfaces(argc ? *argv : NULL); +#else + bb_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) { + bb_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) { + bb_show_usage(); + } + if (*++argv == NULL) { + if (mask & A_ARG_REQ) { + bb_show_usage(); + } else { + --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) { +#ifdef CONFIG_FEATURE_IFCONFIG_HW + if (mask & A_CAST_RESOLVE) { +#endif +#ifdef CONFIG_FEATURE_IPV6 + char *prefix; + int prefix_len = 0; +#endif + + safe_strncpy(host, *argv, (sizeof host)); +#ifdef CONFIG_FEATURE_IPV6 + if ((prefix = strchr(host, '/'))) { + if (safe_strtoi(prefix + 1, &prefix_len) || + (prefix_len < 0) || (prefix_len > 128)) + { + ++goterr; + goto LOOP; + } + *prefix = 0; + } +#endif + + sai.sin_family = AF_INET; + sai.sin_port = 0; + if (!strcmp(host, bb_INET_default)) { + /* Default is special, meaning 0.0.0.0. */ + sai.sin_addr.s_addr = INADDR_ANY; +#ifdef CONFIG_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 +#ifdef CONFIG_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. */ + if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { + bb_perror_msg_and_die("socket6"); + } + if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) { + perror("SIOGIFINDEX"); + ++goterr; + continue; + } + ifr6.ifr6_ifindex = ifr.ifr_ifindex; + ifr6.ifr6_prefixlen = prefix_len; + if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) { + perror(a1op->name); + ++goterr; + } + continue; +#endif + } else if (inet_aton(host, &sai.sin_addr) == 0) { + /* It's not a dotted quad. */ + struct hostent *hp; + if ((hp = gethostbyname(host)) == (struct hostent *)NULL) { + ++goterr; + continue; + } + memcpy((char *) &sai.sin_addr, (char *) hp->h_addr_list[0], + sizeof(struct in_addr)); + } +#ifdef CONFIG_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; +#ifdef CONFIG_FEATURE_IFCONFIG_HW + } else { /* A_CAST_HOST_COPY_IN_ETHER */ + /* This is the "hw" arg case. */ + if (strcmp("ether", *argv) || (*++argv == NULL)) { + bb_show_usage(); + } + safe_strncpy(host, *argv, (sizeof host)); + if (in_ether(host, &sa)) { + bb_error_msg("invalid hw-addr %s", 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 CONFIG_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: + continue; + } /* end of while-loop */ + + return goterr; +} + +#ifdef CONFIG_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; + + 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 (int) (*bufp); /* Error if we don't end at end of string. */ +} +#endif |