inet_net_ntop.c File Reference

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

Include dependency graph for inet_net_ntop.c:

Go to the source code of this file.

Macros
#define	NS_IN6ADDRSZ   16
#define	NS_INT16SZ   2
#define	SPRINTF(x)   ((size_t)sprintf x)

Functions
static char *	inet_net_ntop_ipv4 (const u_char *src, int bits, char *dst, size_t size)
static char *	inet_net_ntop_ipv6 (const u_char *src, int bits, char *dst, size_t size)
char *	pg_inet_net_ntop (int af, const void *src, int bits, char *dst, size_t size)
static int	decoct (const u_char *src, int bytes, char *dst, size_t size)

Macro Definition Documentation

NS_IN6ADDRSZ

#define NS_IN6ADDRSZ   16

Definition at line 47 of file inet_net_ntop.c.

NS_INT16SZ

#define NS_INT16SZ   2

Definition at line 48 of file inet_net_ntop.c.

SPRINTF

#define SPRINTF

(

x

)

((size_t)sprintf x)

Definition at line 53 of file inet_net_ntop.c.

Function Documentation

decoct()

static int decoct ( const u_char *  src, int  bytes, char *  dst, size_t  size  )

static

Definition at line 155 of file inet_net_ntop.c.

{
    char       *odst = dst;
    char       *t;
    int         b;
 
    for (b = 1; b <= bytes; b++)
    {
        if (size <= sizeof "255.")
            return (0);
        t = dst;
        dst += SPRINTF((dst, "%u", *src++));
        if (b != bytes)
        {
            *dst++ = '.';
            *dst = '\0';
        }
        size -= (size_t) (dst - t);
    }
    return (dst - odst);
}

References b, and SPRINTF.

Referenced by inet_net_ntop_ipv6().

inet_net_ntop_ipv4()

static char * inet_net_ntop_ipv4 ( const u_char *  src, int  bits, char *  dst, size_t  size  )

static

Definition at line 114 of file inet_net_ntop.c.

{
    char       *odst = dst;
    char       *t;
    int         len = 4;
    int         b;
 
    if (bits < 0 || bits > 32)
    {
        errno = EINVAL;
        return (NULL);
    }
 
    /* Always format all four octets, regardless of mask length. */
    for (b = len; b > 0; b--)
    {
        if (size <= sizeof ".255")
            goto emsgsize;
        t = dst;
        if (dst != odst)
            *dst++ = '.';
        dst += SPRINTF((dst, "%u", *src++));
        size -= (size_t) (dst - t);
    }
 
    /* don't print masklen if 32 bits */
    if (bits != 32)
    {
        if (size <= sizeof "/32")
            goto emsgsize;
        dst += SPRINTF((dst, "/%u", bits));
    }
 
    return (odst);
 
emsgsize:
    errno = EMSGSIZE;
    return (NULL);
}

References b, EMSGSIZE, len, and SPRINTF.

Referenced by pg_inet_net_ntop().

inet_net_ntop_ipv6()

static char * inet_net_ntop_ipv6 ( const u_char *  src, int  bits, char *  dst, size_t  size  )

static

Definition at line 178 of file inet_net_ntop.c.

{
    /*
     * Note that int32_t and int16_t need only be "at least" large enough to
     * contain a value of the specified size.  On some systems, like Crays,
     * there is no such thing as an integer variable with 16 bits. Keep this
     * in mind if you think this function should have been coded to use
     * pointer overlays.  All the world's not a VAX.
     */
    char        tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
    char       *tp;
    struct
    {
        int         base,
                    len;
    }           best, cur;
    u_int       words[NS_IN6ADDRSZ / NS_INT16SZ];
    int         i;
 
    if ((bits < -1) || (bits > 128))
    {
        errno = EINVAL;
        return (NULL);
    }
 
    /*
     * Preprocess: Copy the input (bytewise) array into a wordwise array. Find
     * the longest run of 0x00's in src[] for :: shorthanding.
     */
    memset(words, '\0', sizeof words);
    for (i = 0; i < NS_IN6ADDRSZ; i++)
        words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
    best.base = -1;
    cur.base = -1;
    best.len = 0;
    cur.len = 0;
    for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
    {
        if (words[i] == 0)
        {
            if (cur.base == -1)
                cur.base = i, cur.len = 1;
            else
                cur.len++;
        }
        else
        {
            if (cur.base != -1)
            {
                if (best.base == -1 || cur.len > best.len)
                    best = cur;
                cur.base = -1;
            }
        }
    }
    if (cur.base != -1)
    {
        if (best.base == -1 || cur.len > best.len)
            best = cur;
    }
    if (best.base != -1 && best.len < 2)
        best.base = -1;
 
    /*
     * Format the result.
     */
    tp = tmp;
    for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
    {
        /* Are we inside the best run of 0x00's? */
        if (best.base != -1 && i >= best.base &&
            i < (best.base + best.len))
        {
            if (i == best.base)
                *tp++ = ':';
            continue;
        }
        /* Are we following an initial run of 0x00s or any real hex? */
        if (i != 0)
            *tp++ = ':';
        /* Is this address an encapsulated IPv4? */
        if (i == 6 && best.base == 0 && (best.len == 6 ||
                                         (best.len == 7 && words[7] != 0x0001) ||
                                         (best.len == 5 && words[5] == 0xffff)))
        {
            int         n;
 
            n = decoct(src + 12, 4, tp, sizeof tmp - (tp - tmp));
            if (n == 0)
            {
                errno = EMSGSIZE;
                return (NULL);
            }
            tp += strlen(tp);
            break;
        }
        tp += SPRINTF((tp, "%x", words[i]));
    }
 
    /* Was it a trailing run of 0x00's? */
    if (best.base != -1 && (best.base + best.len) ==
        (NS_IN6ADDRSZ / NS_INT16SZ))
        *tp++ = ':';
    *tp = '\0';
 
    if (bits != -1 && bits != 128)
        tp += SPRINTF((tp, "/%u", bits));
 
    /*
     * Check for overflow, copy, and we're done.
     */
    if ((size_t) (tp - tmp) > size)
    {
        errno = EMSGSIZE;
        return (NULL);
    }
    strcpy(dst, tmp);
    return (dst);
}

References cur, decoct(), EMSGSIZE, i, len, NS_IN6ADDRSZ, NS_INT16SZ, and SPRINTF.

Referenced by pg_inet_net_ntop().

pg_inet_net_ntop()

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

Definition at line 77 of file inet_net_ntop.c.

{
    /*
     * We need to cover both the address family constants used by the PG inet
     * type (PGSQL_AF_INET and PGSQL_AF_INET6) and those used by the system
     * libraries (AF_INET and AF_INET6).  We can safely assume PGSQL_AF_INET
     * == AF_INET, but the INET6 constants are very likely to be different.
     */
    switch (af)
    {
        case PGSQL_AF_INET:
            return (inet_net_ntop_ipv4(src, bits, dst, size));
        case PGSQL_AF_INET6:
#if AF_INET6 != PGSQL_AF_INET6
        case AF_INET6:
#endif
            return (inet_net_ntop_ipv6(src, bits, dst, size));
        default:
            errno = EAFNOSUPPORT;
            return (NULL);
    }
}

References EAFNOSUPPORT, inet_net_ntop_ipv4(), inet_net_ntop_ipv6(), PGSQL_AF_INET, and PGSQL_AF_INET6.

Referenced by getHostaddr(), inet_abbrev(), network_host(), network_out(), network_show(), and pq_verify_peer_name_matches_certificate_ip().