inet_pton.h File Reference

Go to the source code of this file.

Functions
static int	inet_pton4 (const char *src, unsigned char *dst)
static int	inet_pton6 (const char *src, unsigned char *dst)
static int	os_inet_pton (int af, const char *src, void *dst)

Function Documentation

inet_pton4()

static int inet_pton4 ( const char *  src, unsigned char *  dst  )

static

int inet_pton4(src, dst) like inet_aton() but without all the hexadecimal and shorthand. return: 1 if ‘src’ is a valid dotted quad, else 0. notice: does not touch ‘dst’ unless it's returning 1. author: Paul Vixie, 1996.

Definition at line 65 of file inet_pton.h.

{
    static const char digits[] = "0123456789";
    int saw_digit, octets, ch;
    unsigned char tmp[NS_INADDRSZ], *tp;
 
    saw_digit = 0;
    octets = 0;
    *(tp = tmp) = 0;
    while ((ch = *src++) != '\0') {
        const char *pch;
 
        if ((pch = strchr(digits, ch)) != NULL) {
            unsigned int new = *tp * 10;
 
            new += (unsigned int)(pch - digits);
            if (new > 255)
                return (0);
            *tp = new;
            if (!saw_digit) {
                if (++octets > 4)
                    return (0);
                saw_digit = 1;
            }
        } else if (ch == '.' && saw_digit) {
            if (octets == 4)
                return (0);
            /*
             * "clang --analyse" generates warnings using:
             *      *++tp = 0;
             */
            tp++;
            *tp = 0;
            saw_digit = 0;
        } else
            return (0);
    }
    if (octets < 4)
        return (0);
    memmove(dst, tmp, NS_INADDRSZ);
    return (1);
}

Referenced by inet_pton6(), and os_inet_pton().

inet_pton6()

static int inet_pton6 ( const char *  src, unsigned char *  dst  )

static

int inet_pton6(src, dst) convert presentation level address to network order binary form. return: 1 if ‘src’ is a valid [RFC1884 2.2] address, else 0. notice: (1) does not touch ‘dst’ unless it's returning 1. (2) :: in a full address is silently ignored. credit: inspired by Mark Andrews. author: Paul Vixie, 1996.

Definition at line 121 of file inet_pton.h.

{
    static const char xdigits_l[] = "0123456789abcdef",
                      xdigits_u[] = "0123456789ABCDEF";
    unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
    const char *xdigits, *curtok;
    int ch, seen_xdigits;
    unsigned int val;
 
    memset((tp = tmp), '\0', NS_IN6ADDRSZ);
    endp = tp + NS_IN6ADDRSZ;
    colonp = NULL;
    /* Leading :: requires some special handling. */
    if (*src == ':')
        if (*++src != ':')
            return (0);
    curtok = src;
    seen_xdigits = 0;
    val = 0;
    while ((ch = *src++) != '\0') {
        const char *pch;
 
        if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
            pch = strchr((xdigits = xdigits_u), ch);
        if (pch != NULL) {
            val <<= 4;
            val |= (pch - xdigits);
            if (++seen_xdigits > 4)
                return (0);
            continue;
        }
        if (ch == ':') {
            curtok = src;
            if (!seen_xdigits) {
                if (colonp)
                    return (0);
                colonp = tp;
                continue;
            }
            if (tp + NS_INT16SZ > endp)
                return (0);
            *tp++ = (unsigned char)(val >> 8) & 0xff;
            *tp++ = (unsigned char)val & 0xff;
            seen_xdigits = 0;
            val = 0;
            continue;
        }
        if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
            inet_pton4(curtok, tp) > 0) {
            tp += NS_INADDRSZ;
            seen_xdigits = 0;
            break;  /* '\0' was seen by inet_pton4(). */
        }
        return (0);
    }
    if (seen_xdigits) {
        if (tp + NS_INT16SZ > endp)
            return (0);
        *tp++ = (unsigned char)(val >> 8) & 0xff;
        *tp++ = (unsigned char)val & 0xff;
    }
    if (colonp != NULL) {
        /*
         * Since some memmove()'s erroneously fail to handle
         * overlapping regions, we'll do the shift by hand.
         */
        const int n = (int)(tp - colonp);
        int i;
 
        for (i = 1; i <= n; i++) {
            endp[-i] = colonp[n - i];
            colonp[n - i] = 0;
        }
        tp = endp;
    }
    if (tp != endp)
        return (0);
    memmove(dst, tmp, NS_IN6ADDRSZ);
    return (1);
}

Referenced by os_inet_pton().

os_inet_pton()

static int os_inet_pton ( int  af, const char *  src, void *  dst  )

static

int lwres_net_pton(af, src, dst) convert from presentation format (which usually means ASCII printable) to network format (which is usually some kind of binary format). return: 1 if the address was valid for the specified address family 0 if the address wasn't valid (‘dst’ is untouched in this case) -1 if some other error occurred (‘dst’ is untouched in this case, too) author: Paul Vixie, 1996.

Definition at line 41 of file inet_pton.h.

{
    switch (af) {
    case AF_INET:
        return (inet_pton4(src, dst));
    case AF_INET6:
        return (inet_pton6(src, dst));
    default:
        /* errno = EAFNOSUPPORT */;
        return (-1);
    }
    /* NOTREACHED */
}

Referenced by NET_StringPairToAdr().