source: MondoRescue/branches/3.2/mindi-busybox/networking/libiproute/utils.c@ 3232

/* vi: set sw=4 ts=4: */
/*
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 *
 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Changes:
 *
 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
 */

#include "libbb.h"
#include "utils.h"
#include "inet_common.h"

unsigned get_unsigned(char *arg, const char *errmsg)
{
    unsigned long res;
    char *ptr;

    if (*arg) {
        res = strtoul(arg, &ptr, 0);
//FIXME: "" will be accepted too, is it correct?!
        if (!*ptr && res <= UINT_MAX) {
            return res;
        }
    }
    invarg(arg, errmsg); /* does not return */
}

uint32_t get_u32(char *arg, const char *errmsg)
{
    unsigned long res;
    char *ptr;

    if (*arg) {
        res = strtoul(arg, &ptr, 0);
//FIXME: "" will be accepted too, is it correct?!
        if (!*ptr && res <= 0xFFFFFFFFUL) {
            return res;
        }
    }
    invarg(arg, errmsg); /* does not return */
}

uint16_t get_u16(char *arg, const char *errmsg)
{
    unsigned long res;
    char *ptr;

    if (*arg) {
        res = strtoul(arg, &ptr, 0);
//FIXME: "" will be accepted too, is it correct?!
        if (!*ptr && res <= 0xFFFF) {
            return res;
        }
    }
    invarg(arg, errmsg); /* does not return */
}

int get_addr_1(inet_prefix *addr, char *name, int family)
{
    memset(addr, 0, sizeof(*addr));

    if (strcmp(name, "default") == 0
     || strcmp(name, "all") == 0
     || strcmp(name, "any") == 0
    ) {
        addr->family = family;
        addr->bytelen = (family == AF_INET6 ? 16 : 4);
        addr->bitlen = -1;
        return 0;
    }

    if (strchr(name, ':')) {
        addr->family = AF_INET6;
        if (family != AF_UNSPEC && family != AF_INET6)
            return -1;
        if (inet_pton(AF_INET6, name, addr->data) <= 0)
            return -1;
        addr->bytelen = 16;
        addr->bitlen = -1;
        return 0;
    }

    if (family != AF_UNSPEC && family != AF_INET)
        return -1;

    /* Try to parse it as IPv4 */
    addr->family = AF_INET;
#if 0 /* Doesn't handle e.g. "10.10", for example, "ip r l root 10.10/16" */
    if (inet_pton(AF_INET, name, addr->data) <= 0)
        return -1;
#else
    {
        unsigned i = 0;
        unsigned n = 0;
        const char *cp = name - 1;
        while (*++cp) {
            if ((unsigned char)(*cp - '0') <= 9) {
                n = 10 * n + (unsigned char)(*cp - '0');
                if (n >= 256)
                    return -1;
                ((uint8_t*)addr->data)[i] = n;
                continue;
            }
            if (*cp == '.' && ++i <= 3) {
                n = 0;
                continue;
            }
            return -1;
        }
    }
#endif
    addr->bytelen = 4;
    addr->bitlen = -1;

    return 0;
}

static void get_prefix_1(inet_prefix *dst, char *arg, int family)
{
    char *slash;

    memset(dst, 0, sizeof(*dst));

    if (strcmp(arg, "default") == 0
     || strcmp(arg, "all") == 0
     || strcmp(arg, "any") == 0
    ) {
        dst->family = family;
        /*dst->bytelen = 0; - done by memset */
        /*dst->bitlen = 0;*/
        return;
    }

    slash = strchr(arg, '/');
    if (slash)
        *slash = '\0';

    if (get_addr_1(dst, arg, family) == 0) {
        dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
        if (slash) {
            unsigned plen;
            inet_prefix netmask_pfx;

            netmask_pfx.family = AF_UNSPEC;
            plen = bb_strtou(slash + 1, NULL, 0);
            if ((errno || plen > dst->bitlen)
             && get_addr_1(&netmask_pfx, slash + 1, family) != 0
            ) {
                goto bad;
            }
            if (netmask_pfx.family == AF_INET) {
                /* fill in prefix length of dotted quad */
                uint32_t mask = ntohl(netmask_pfx.data[0]);
                uint32_t host = ~mask;

                /* a valid netmask must be 2^n - 1 */
                if (host & (host + 1))
                    goto bad;

                for (plen = 0; mask; mask <<= 1)
                    ++plen;
                if (plen > dst->bitlen)
                    goto bad;
                /* dst->flags |= PREFIXLEN_SPECIFIED; */
            }
            dst->bitlen = plen;
        }
    }

    if (slash)
        *slash = '/';
    return;
 bad:
    bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "prefix", arg);
}

int get_addr(inet_prefix *dst, char *arg, int family)
{
    if (family == AF_PACKET) {
        bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "address");
    }
    if (get_addr_1(dst, arg, family)) {
        bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "address", arg);
    }
    return 0;
}

void get_prefix(inet_prefix *dst, char *arg, int family)
{
    if (family == AF_PACKET) {
        bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "prefix");
    }
    get_prefix_1(dst, arg, family);
}

uint32_t get_addr32(char *name)
{
    inet_prefix addr;

    if (get_addr_1(&addr, name, AF_INET)) {
        bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "IP", "address", name);
    }
    return addr.data[0];
}

void incomplete_command(void)
{
    bb_error_msg_and_die("command line is not complete, try option \"help\"");
}

void invarg(const char *arg, const char *opt)
{
    bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
}

void duparg(const char *key, const char *arg)
{
    bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
}

void duparg2(const char *key, const char *arg)
{
    bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
}

int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
{
    const uint32_t *a1 = a->data;
    const uint32_t *a2 = b->data;
    int words = bits >> 5;

    bits &= 0x1f;

    if (words)
        if (memcmp(a1, a2, words << 2))
            return -1;

    if (bits) {
        uint32_t w1, w2;
        uint32_t mask;

        w1 = a1[words];
        w2 = a2[words];

        mask = htonl((0xffffffff) << (0x20 - bits));

        if ((w1 ^ w2) & mask)
            return 1;
    }

    return 0;
}

const char *rt_addr_n2a(int af,
        void *addr, char *buf, int buflen)
{
    switch (af) {
    case AF_INET:
    case AF_INET6:
        return inet_ntop(af, addr, buf, buflen);
    default:
        return "???";
    }
}

#ifdef RESOLVE_HOSTNAMES
const char *format_host(int af, int len, void *addr, char *buf, int buflen)
{
    if (resolve_hosts) {
        struct hostent *h_ent;

        if (len <= 0) {
            switch (af) {
            case AF_INET:
                len = 4;
                break;
            case AF_INET6:
                len = 16;
                break;
            default:;
            }
        }
        if (len > 0) {
            h_ent = gethostbyaddr(addr, len, af);
            if (h_ent != NULL) {
                safe_strncpy(buf, h_ent->h_name, buflen);
                return buf;
            }
        }
    }
    return rt_addr_n2a(af, addr, buf, buflen);
}
#endif