Permalink
Fetching contributors…
Cannot retrieve contributors at this time
314 lines (284 sloc) 8.11 KB
/*
* 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>
#if defined(_MSC_VER) && _MSC_VER < 1600
# include "stdint-msvc2008.h"
#else
# include <stdint.h>
#endif
#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;
#ifndef _WIN32
l = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);
#else
l = _snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);
#endif
if (l <= 0 || (size_t) l >= size) {
return UV_ENOSPC;
}
strncpy(dst, tmp, size);
dst[size - 1] = '\0';
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 += sprintf(tp, "%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';
/*
* Check for overflow, copy, and we're done.
*/
if ((size_t)(tp - tmp) > size) {
return UV_ENOSPC;
}
strcpy(dst, tmp);
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;
}