/*

* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

* Copyright (c) 1996-1999 by Internet Software Consortium.

*

* Permission to use, copy, modify, and distribute this software for any

* purpose with or without fee is hereby granted, provided that the above

* copyright notice and this permission notice appear in all copies.

*

* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES

* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR

* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT

* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*/

#include <stdio.h>

#include <string.h>

#include <stdint.h>

#include "uv.h"

#include "uv-common.h"

#define UV__INET_ADDRSTRLEN 16

#define UV__INET6_ADDRSTRLEN 46

static int inet_ntop4(const unsigned char *src, char *dst, size_t size);

static int inet_ntop6(const unsigned char *src, char *dst, size_t size);

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

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

int uv_inet_ntop(int af, const void* src, char* dst, size_t size) {

switch (af) {

case AF_INET:

return (inet_ntop4(src, dst, size));

case AF_INET6:

return (inet_ntop6(src, dst, size));

default:

return UV_EAFNOSUPPORT;

}

/* NOTREACHED */

}

static int inet_ntop4(const unsigned char *src, char *dst, size_t size) {

static const char fmt[] = "%u.%u.%u.%u";

char tmp[UV__INET_ADDRSTRLEN];

int l;

l = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);

if (l <= 0 || (size_t) l >= size) {

return UV_ENOSPC;

}

uv__strscpy(dst, tmp, size);

return 0;

}

static int inet_ntop6(const unsigned char *src, char *dst, size_t size) {

/*

* 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[UV__INET6_ADDRSTRLEN], *tp;

struct { int base, len; } best, cur;

unsigned int words[sizeof(struct in6_addr) / sizeof(uint16_t)];

int i;

/*

* 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 < (int) sizeof(struct in6_addr); i++)

words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));

best.base = -1;

best.len = 0;

cur.base = -1;

cur.len = 0;

for (i = 0; i < (int) ARRAY_SIZE(words); 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 < (int) ARRAY_SIZE(words); 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 err = inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp));

if (err)

return err;

tp += strlen(tp);

break;

}

tp += snprintf(tp, sizeof tmp - (tp - tmp), "%x", words[i]);

}

/* Was it a trailing run of 0x00's? */

if (best.base != -1 && (best.base + best.len) == ARRAY_SIZE(words))

*tp++ = ':';

*tp++ = '\0';

if ((size_t) (tp - tmp) > size)

return UV_ENOSPC;

uv__strscpy(dst, tmp, size);

return 0;

}

int uv_inet_pton(int af, const char* src, void* dst) {

if (src == NULL || dst == NULL)

return UV_EINVAL;

switch (af) {

case AF_INET:

return (inet_pton4(src, dst));

case AF_INET6: {

int len;

char tmp[UV__INET6_ADDRSTRLEN], *s, *p;

s = (char*) src;

p = strchr(src, '%');

if (p != NULL) {

s = tmp;

len = p - src;

if (len > UV__INET6_ADDRSTRLEN-1)

return UV_EINVAL;

memcpy(s, src, len);

s[len] = '\0';

}

return inet_pton6(s, dst);

}

default:

return UV_EAFNOSUPPORT;

}

/* NOTREACHED */

}

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

static const char digits[] = "0123456789";

int saw_digit, octets, ch;

unsigned char tmp[sizeof(struct in_addr)], *tp;

saw_digit = 0;

octets = 0;

*(tp = tmp) = 0;

while ((ch = *src++) != '\0') {

const char *pch;

if ((pch = strchr(digits, ch)) != NULL) {

unsigned int nw = *tp * 10 + (pch - digits);

if (saw_digit && *tp == 0)

return UV_EINVAL;

if (nw > 255)

return UV_EINVAL;

*tp = nw;

if (!saw_digit) {

if (++octets > 4)

return UV_EINVAL;

saw_digit = 1;

}

} else if (ch == '.' && saw_digit) {

if (octets == 4)

return UV_EINVAL;

*++tp = 0;

saw_digit = 0;

} else

return UV_EINVAL;

}

if (octets < 4)

return UV_EINVAL;

memcpy(dst, tmp, sizeof(struct in_addr));

return 0;

}

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

static const char xdigits_l[] = "0123456789abcdef",

xdigits_u[] = "0123456789ABCDEF";

unsigned char tmp[sizeof(struct in6_addr)], *tp, *endp, *colonp;

const char *xdigits, *curtok;

int ch, seen_xdigits;

unsigned int val;

memset((tp = tmp), '\0', sizeof tmp);

endp = tp + sizeof tmp;

colonp = NULL;

/* Leading :: requires some special handling. */

if (*src == ':')

if (*++src != ':')

return UV_EINVAL;

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 UV_EINVAL;

continue;

}

if (ch == ':') {

curtok = src;

if (!seen_xdigits) {

if (colonp)

return UV_EINVAL;

colonp = tp;

continue;

} else if (*src == '\0') {

return UV_EINVAL;

}

if (tp + sizeof(uint16_t) > endp)

return UV_EINVAL;

*tp++ = (unsigned char) (val >> 8) & 0xff;

*tp++ = (unsigned char) val & 0xff;

seen_xdigits = 0;

val = 0;

continue;

}

if (ch == '.' && ((tp + sizeof(struct in_addr)) <= endp)) {

int err = inet_pton4(curtok, tp);

if (err == 0) {

tp += sizeof(struct in_addr);

seen_xdigits = 0;

break; /*%< '\\0' was seen by inet_pton4(). */

}

}

return UV_EINVAL;

}

if (seen_xdigits) {

if (tp + sizeof(uint16_t) > endp)

return UV_EINVAL;

*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 = tp - colonp;

int i;

if (tp == endp)

return UV_EINVAL;

for (i = 1; i <= n; i++) {

endp[- i] = colonp[n - i];

colonp[n - i] = 0;

}

tp = endp;

}

if (tp != endp)

return UV_EINVAL;

memcpy(dst, tmp, sizeof tmp);

return 0;

}