/* 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, * * 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 1.6 2001/03/09 23:06:15 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. */ #include #include #include // strcmp and friends #include // isdigit and friends #include /* offsetof */ #include #include #include #include #include #include #include #include #include "busybox.h" #ifdef BB_FEATURE_IFCONFIG_SLIP #include #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 display_interfaces(void); #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; if(argc < 2) { #ifdef BB_FEATURE_IFCONFIG_STATUS return(display_interfaces()); #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"); } /* skip argv[0] */ argc--; argv++; /* 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)) { /* 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