| /* 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 1.8 2001/03/12 09:57:59 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 |
| show_usage(); |
| #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 |