| /* The following code has been extracted from the kenrel sources, if there is |
| * any problem, blame for mangling it. --pablo */ |
| |
| /* |
| * Generic address resultion entity |
| * |
| * Authors: |
| * net_random Alan Cox |
| * net_ratelimit Andi Kleen |
| * in{4,6}_pton YOSHIFUJI Hideaki, Copyright (C)2006 USAGI/WIDE Project |
| * |
| * Created by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| /* |
| * lib/hexdump.c |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. See README and COPYING for |
| * more details. |
| */ |
| |
| #include <stdint.h> |
| #include <ctype.h> |
| #include <string.h> /* for memcpy */ |
| |
| #include "helper.h" |
| |
| static int hex_to_bin(char ch) |
| { |
| if ((ch >= '0') && (ch <= '9')) |
| return ch - '0'; |
| ch = tolower(ch); |
| if ((ch >= 'a') && (ch <= 'f')) |
| return ch - 'a' + 10; |
| return -1; |
| } |
| |
| #define IN6PTON_XDIGIT 0x00010000 |
| #define IN6PTON_DIGIT 0x00020000 |
| #define IN6PTON_COLON_MASK 0x00700000 |
| #define IN6PTON_COLON_1 0x00100000 /* single : requested */ |
| #define IN6PTON_COLON_2 0x00200000 /* second : requested */ |
| #define IN6PTON_COLON_1_2 0x00400000 /* :: requested */ |
| #define IN6PTON_DOT 0x00800000 /* . */ |
| #define IN6PTON_DELIM 0x10000000 |
| #define IN6PTON_NULL 0x20000000 /* first/tail */ |
| #define IN6PTON_UNKNOWN 0x40000000 |
| |
| static inline int xdigit2bin(char c, int delim) |
| { |
| int val; |
| |
| if (c == delim || c == '\0') |
| return IN6PTON_DELIM; |
| if (c == ':') |
| return IN6PTON_COLON_MASK; |
| if (c == '.') |
| return IN6PTON_DOT; |
| |
| val = hex_to_bin(c); |
| if (val >= 0) |
| return val | IN6PTON_XDIGIT | (val < 10 ? IN6PTON_DIGIT : 0); |
| |
| if (delim == -1) |
| return IN6PTON_DELIM; |
| return IN6PTON_UNKNOWN; |
| } |
| |
| int in4_pton(const char *src, int srclen, |
| uint8_t *dst, |
| int delim, const char **end) |
| { |
| const char *s; |
| uint8_t *d; |
| uint8_t dbuf[4]; |
| int ret = 0; |
| int i; |
| int w = 0; |
| |
| if (srclen < 0) |
| srclen = strlen(src); |
| s = src; |
| d = dbuf; |
| i = 0; |
| while(1) { |
| int c; |
| c = xdigit2bin(srclen > 0 ? *s : '\0', delim); |
| if (!(c & (IN6PTON_DIGIT | IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK))) { |
| goto out; |
| } |
| if (c & (IN6PTON_DOT | IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
| if (w == 0) |
| goto out; |
| *d++ = w & 0xff; |
| w = 0; |
| i++; |
| if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
| if (i != 4) |
| goto out; |
| break; |
| } |
| goto cont; |
| } |
| w = (w * 10) + c; |
| if ((w & 0xffff) > 255) { |
| goto out; |
| } |
| cont: |
| if (i >= 4) |
| goto out; |
| s++; |
| srclen--; |
| } |
| ret = 1; |
| memcpy(dst, dbuf, sizeof(dbuf)); |
| out: |
| if (end) |
| *end = s; |
| return ret; |
| } |
| |
| int in6_pton(const char *src, int srclen, |
| uint8_t *dst, |
| int delim, const char **end) |
| { |
| const char *s, *tok = NULL; |
| uint8_t *d, *dc = NULL; |
| uint8_t dbuf[16]; |
| int ret = 0; |
| int i; |
| int state = IN6PTON_COLON_1_2 | IN6PTON_XDIGIT | IN6PTON_NULL; |
| int w = 0; |
| |
| memset(dbuf, 0, sizeof(dbuf)); |
| |
| s = src; |
| d = dbuf; |
| if (srclen < 0) |
| srclen = strlen(src); |
| |
| while (1) { |
| int c; |
| |
| c = xdigit2bin(srclen > 0 ? *s : '\0', delim); |
| if (!(c & state)) |
| goto out; |
| if (c & (IN6PTON_DELIM | IN6PTON_COLON_MASK)) { |
| /* process one 16-bit word */ |
| if (!(state & IN6PTON_NULL)) { |
| *d++ = (w >> 8) & 0xff; |
| *d++ = w & 0xff; |
| } |
| w = 0; |
| if (c & IN6PTON_DELIM) { |
| /* We've processed last word */ |
| break; |
| } |
| /* |
| * COLON_1 => XDIGIT |
| * COLON_2 => XDIGIT|DELIM |
| * COLON_1_2 => COLON_2 |
| */ |
| switch (state & IN6PTON_COLON_MASK) { |
| case IN6PTON_COLON_2: |
| dc = d; |
| state = IN6PTON_XDIGIT | IN6PTON_DELIM; |
| if (dc - dbuf >= (int)sizeof(dbuf)) |
| state |= IN6PTON_NULL; |
| break; |
| case IN6PTON_COLON_1|IN6PTON_COLON_1_2: |
| state = IN6PTON_XDIGIT | IN6PTON_COLON_2; |
| break; |
| case IN6PTON_COLON_1: |
| state = IN6PTON_XDIGIT; |
| break; |
| case IN6PTON_COLON_1_2: |
| state = IN6PTON_COLON_2; |
| break; |
| default: |
| state = 0; |
| } |
| tok = s + 1; |
| goto cont; |
| } |
| |
| if (c & IN6PTON_DOT) { |
| ret = in4_pton(tok ? tok : s, srclen + (int)(s - tok), d, delim, &s); |
| if (ret > 0) { |
| d += 4; |
| break; |
| } |
| goto out; |
| } |
| |
| w = (w << 4) | (0xff & c); |
| state = IN6PTON_COLON_1 | IN6PTON_DELIM; |
| if (!(w & 0xf000)) { |
| state |= IN6PTON_XDIGIT; |
| } |
| if (!dc && d + 2 < dbuf + sizeof(dbuf)) { |
| state |= IN6PTON_COLON_1_2; |
| state &= ~IN6PTON_DELIM; |
| } |
| if (d + 2 >= dbuf + sizeof(dbuf)) { |
| state &= ~(IN6PTON_COLON_1|IN6PTON_COLON_1_2); |
| } |
| cont: |
| if ((dc && d + 4 < dbuf + sizeof(dbuf)) || |
| d + 4 == dbuf + sizeof(dbuf)) { |
| state |= IN6PTON_DOT; |
| } |
| if (d >= dbuf + sizeof(dbuf)) { |
| state &= ~(IN6PTON_XDIGIT|IN6PTON_COLON_MASK); |
| } |
| s++; |
| srclen--; |
| } |
| |
| i = 15; d--; |
| |
| if (dc) { |
| while(d >= dc) |
| dst[i--] = *d--; |
| while(i >= dc - dbuf) |
| dst[i--] = 0; |
| while(i >= 0) |
| dst[i--] = *d--; |
| } else |
| memcpy(dst, dbuf, sizeof(dbuf)); |
| |
| ret = 1; |
| out: |
| if (end) |
| *end = s; |
| return ret; |
| } |