diff options
Diffstat (limited to 'strtoaddr.c')
| -rw-r--r-- | strtoaddr.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/strtoaddr.c b/strtoaddr.c new file mode 100644 index 0000000..c6f79d9 --- /dev/null +++ b/strtoaddr.c @@ -0,0 +1,235 @@ +/* + * 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "netdissect-stdinc.h" +#include <stddef.h> +#include <string.h> + +#include "netdissect-ctype.h" + +#include "strtoaddr.h" + +#ifndef NS_INADDRSZ +#define NS_INADDRSZ 4 /* IPv4 T_A */ +#endif + +#ifndef NS_IN6ADDRSZ +#define NS_IN6ADDRSZ 16 /* IPv6 T_AAAA */ +#endif + +#ifndef NS_INT16SZ +#define NS_INT16SZ 2 /* #/bytes of data in a uint16_t */ +#endif + +/*% + * WARNING: Don't even consider trying to compile this on a system where + * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. + */ + +/* int + * strtoaddr(src, dst) + * convert presentation level IPv4 address to network order binary form. + * return: + * 1 if `src' is a valid input, else 0. + * notice: + * does not touch `dst' unless it's returning 1. + * author: + * Paul Vixie, 1996. + */ +int +strtoaddr(const char *src, void *dst) +{ + uint32_t val; + u_int digit; + ptrdiff_t n; + unsigned char c; + u_int parts[4]; + u_int *pp = parts; + + c = *src; + for (;;) { + /* + * Collect number up to ``.''. + * Values are specified as for C: + * 0x=hex, 0=octal, isdigit=decimal. + */ + if (!ND_ASCII_ISDIGIT(c)) + return (0); + val = 0; + if (c == '0') { + c = *++src; + if (c == 'x' || c == 'X') + return (0); + else if (ND_ASCII_ISDIGIT(c) && c != '9') + return (0); + } + for (;;) { + if (ND_ASCII_ISDIGIT(c)) { + digit = c - '0'; + val = (val * 10) + digit; + c = *++src; + } else + break; + } + if (c == '.') { + /* + * Internet format: + * a.b.c.d + * a.b.c (with c treated as 16 bits) + * a.b (with b treated as 24 bits) + * a (with a treated as 32 bits) + */ + if (pp >= parts + 3) + return (0); + *pp++ = val; + c = *++src; + } else + break; + } + /* + * Check for trailing characters. + */ + if (c != '\0' && c != ' ' && c != '\t') + return (0); + /* + * Find the number of parts specified. + * It must be 4; we only support dotted quads, we don't + * support shorthand. + */ + n = pp - parts + 1; + if (n != 4) + return (0); + /* + * parts[0-2] were set to the first 3 parts of the address; + * val was set to the 4th part. + * + * Check if any part is bigger than 255. + */ + if ((parts[0] | parts[1] | parts[2] | val) > 0xff) + return (0); + /* + * Add the other three parts to val. + */ + val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); + if (dst) { + val = htonl(val); + memcpy(dst, &val, NS_INADDRSZ); + } + return (1); +} + +/* int + * strtoaddr6(src, dst) + * convert presentation level IPv6 address to network order binary form. + * return: + * 1 if `src' is a valid [RFC1884 2.2] address, else 0. + * notice: + * (1) does not touch `dst' unless it's returning 1. + * (2) :: in a full address is silently ignored. + * credit: + * inspired by Mark Andrews. + * author: + * Paul Vixie, 1996. + */ +int +strtoaddr6(const char *src, void *dst) +{ + static const char xdigits_l[] = "0123456789abcdef", + xdigits_u[] = "0123456789ABCDEF"; + u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; + const char *xdigits, *curtok; + int ch, seen_xdigits; + u_int val; + + memset((tp = tmp), '\0', NS_IN6ADDRSZ); + endp = tp + NS_IN6ADDRSZ; + colonp = NULL; + /* Leading :: requires some special handling. */ + if (*src == ':') + if (*++src != ':') + return (0); + 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 |= (int)(pch - xdigits); + if (++seen_xdigits > 4) + return (0); + continue; + } + if (ch == ':') { + curtok = src; + if (!seen_xdigits) { + if (colonp) + return (0); + colonp = tp; + continue; + } else if (*src == '\0') + return (0); + if (tp + NS_INT16SZ > endp) + return (0); + *tp++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_char) val & 0xff; + seen_xdigits = 0; + val = 0; + continue; + } + if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && + strtoaddr(curtok, tp) > 0) { + tp += NS_INADDRSZ; + seen_xdigits = 0; + break; /*%< '\\0' was seen by strtoaddr(). */ + } + return (0); + } + if (seen_xdigits) { + if (tp + NS_INT16SZ > endp) + return (0); + *tp++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_char) val & 0xff; + } + if (colonp != NULL) { + /* + * Since some memmove()'s erroneously fail to handle + * overlapping regions, we'll do the shift by hand. + */ + const ptrdiff_t n = tp - colonp; + int i; + + if (tp == endp) + return (0); + for (i = 1; i <= n; i++) { + endp[- i] = colonp[n - i]; + colonp[n - i] = 0; + } + tp = endp; + } + if (tp != endp) + return (0); + memcpy(dst, tmp, NS_IN6ADDRSZ); + return (1); +} |