inet_cidr_ntop.c File Reference

#include "postgres.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "utils/builtins.h"
#include "utils/inet.h"

Include dependency graph for inet_cidr_ntop.c:

Go to the source code of this file.

Defines
#define	SPRINTF(x)   ((size_t)sprintf x)
Functions
static char *	inet_cidr_ntop_ipv4 (const u_char *src, int bits, char *dst, size_t size)
static char *	inet_cidr_ntop_ipv6 (const u_char *src, int bits, char *dst, size_t size)
char *	inet_cidr_ntop (int af, const void *src, int bits, char *dst, size_t size)

---

Define Documentation

#define SPRINTF

(

x

)

((size_t)sprintf x)

Definition at line 38 of file inet_cidr_ntop.c.

Referenced by inet_cidr_ntop_ipv4(), and inet_cidr_ntop_ipv6().

---

Function Documentation

char* inet_cidr_ntop	(	int	af,
		const void *	src,
		int	bits,
		char *	dst,
		size_t	size
	)

Definition at line 57 of file inet_cidr_ntop.c.

References inet_cidr_ntop_ipv4(), inet_cidr_ntop_ipv6(), NULL, PGSQL_AF_INET, and PGSQL_AF_INET6.

Referenced by cidr_abbrev().

{
    switch (af)
    {
        case PGSQL_AF_INET:
            return (inet_cidr_ntop_ipv4(src, bits, dst, size));
        case PGSQL_AF_INET6:
            return (inet_cidr_ntop_ipv6(src, bits, dst, size));
        default:
            errno = EAFNOSUPPORT;
            return (NULL);
    }
}

static char * inet_cidr_ntop_ipv4	(	const u_char *	src,
		int	bits,
		char *	dst,
		size_t	size
	)			[static]

Definition at line 86 of file inet_cidr_ntop.c.

References NULL, and SPRINTF.

Referenced by inet_cidr_ntop().

{
    char       *odst = dst;
    char       *t;
    u_int       m;
    int         b;

    if (bits < 0 || bits > 32)
    {
        errno = EINVAL;
        return (NULL);
    }

    if (bits == 0)
    {
        if (size < sizeof "0")
            goto emsgsize;
        *dst++ = '0';
        size--;
        *dst = '\0';
    }

    /* Format whole octets. */
    for (b = bits / 8; b > 0; b--)
    {
        if (size <= sizeof "255.")
            goto emsgsize;
        t = dst;
        dst += SPRINTF((dst, "%u", *src++));
        if (b > 1)
        {
            *dst++ = '.';
            *dst = '\0';
        }
        size -= (size_t) (dst - t);
    }

    /* Format partial octet. */
    b = bits % 8;
    if (b > 0)
    {
        if (size <= sizeof ".255")
            goto emsgsize;
        t = dst;
        if (dst != odst)
            *dst++ = '.';
        m = ((1 << b) - 1) << (8 - b);
        dst += SPRINTF((dst, "%u", *src & m));
        size -= (size_t) (dst - t);
    }

    /* Format CIDR /width. */
    if (size <= sizeof "/32")
        goto emsgsize;
    dst += SPRINTF((dst, "/%u", bits));
    return (odst);

emsgsize:
    errno = EMSGSIZE;
    return (NULL);
}

static char * inet_cidr_ntop_ipv6	(	const u_char *	src,
		int	bits,
		char *	dst,
		size_t	size
	)			[static]

Definition at line 166 of file inet_cidr_ntop.c.

References i, NULL, and SPRINTF.

Referenced by inet_cidr_ntop().

{
    u_int       m;
    int         b;
    int         p;
    int         zero_s,
                zero_l,
                tmp_zero_s,
                tmp_zero_l;
    int         i;
    int         is_ipv4 = 0;
    unsigned char inbuf[16];
    char        outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
    char       *cp;
    int         words;
    u_char     *s;

    if (bits < 0 || bits > 128)
    {
        errno = EINVAL;
        return (NULL);
    }

    cp = outbuf;

    if (bits == 0)
    {
        *cp++ = ':';
        *cp++ = ':';
        *cp = '\0';
    }
    else
    {
        /* Copy src to private buffer.  Zero host part. */
        p = (bits + 7) / 8;
        memcpy(inbuf, src, p);
        memset(inbuf + p, 0, 16 - p);
        b = bits % 8;
        if (b != 0)
        {
            m = ~0 << (8 - b);
            inbuf[p - 1] &= m;
        }

        s = inbuf;

        /* how many words need to be displayed in output */
        words = (bits + 15) / 16;
        if (words == 1)
            words = 2;

        /* Find the longest substring of zero's */
        zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
        for (i = 0; i < (words * 2); i += 2)
        {
            if ((s[i] | s[i + 1]) == 0)
            {
                if (tmp_zero_l == 0)
                    tmp_zero_s = i / 2;
                tmp_zero_l++;
            }
            else
            {
                if (tmp_zero_l && zero_l < tmp_zero_l)
                {
                    zero_s = tmp_zero_s;
                    zero_l = tmp_zero_l;
                    tmp_zero_l = 0;
                }
            }
        }

        if (tmp_zero_l && zero_l < tmp_zero_l)
        {
            zero_s = tmp_zero_s;
            zero_l = tmp_zero_l;
        }

        if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
                          ((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
                           ((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
            is_ipv4 = 1;

        /* Format whole words. */
        for (p = 0; p < words; p++)
        {
            if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l)
            {
                /* Time to skip some zeros */
                if (p == zero_s)
                    *cp++ = ':';
                if (p == words - 1)
                    *cp++ = ':';
                s++;
                s++;
                continue;
            }

            if (is_ipv4 && p > 5)
            {
                *cp++ = (p == 6) ? ':' : '.';
                cp += SPRINTF((cp, "%u", *s++));
                /* we can potentially drop the last octet */
                if (p != 7 || bits > 120)
                {
                    *cp++ = '.';
                    cp += SPRINTF((cp, "%u", *s++));
                }
            }
            else
            {
                if (cp != outbuf)
                    *cp++ = ':';
                cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
                s += 2;
            }
        }
    }
    /* Format CIDR /width. */
    (void) SPRINTF((cp, "/%u", bits));
    if (strlen(outbuf) + 1 > size)
        goto emsgsize;
    strcpy(dst, outbuf);

    return (dst);

emsgsize:
    errno = EMSGSIZE;
    return (NULL);
}