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Diffstat (limited to 'lib/util/inet_pton.c')
| -rw-r--r-- | lib/util/inet_pton.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/lib/util/inet_pton.c b/lib/util/inet_pton.c new file mode 100644 index 0000000..d3b4b4b --- /dev/null +++ b/lib/util/inet_pton.c @@ -0,0 +1,252 @@ +/* $OpenBSD: inet_pton.c,v 1.8 2010/05/06 15:47:14 claudio Exp $ */ + +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM 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 <config.h> + +#if !defined(HAVE_INET_PTON) + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> +#include <string.h> +#include <errno.h> + +#include <sudo_compat.h> + +#ifndef EAFNOSUPPORT +# define EAFNOSUPPORT EINVAL +#endif + +#ifndef NS_INADDRSZ +# ifdef INADDRSZ +# define NS_INADDRSZ INADDRSZ +# else +# define NS_INADDRSZ 4 +# endif +#endif +#ifndef NS_IN6ADDRSZ +# ifdef IN6ADDRSZ +# define NS_IN6ADDRSZ IN6ADDRSZ +# else +# define NS_IN6ADDRSZ 16 +# endif +#endif +#ifndef NS_INT16SZ +# ifdef INT16SZ +# define NS_INT16SZ INT16SZ +# else +# define NS_INT16SZ 2 +# endif +#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 + * inet_pton4(src, dst) + * like inet_aton() but without all the hexadecimal and shorthand. + * return: + * 1 if `src' is a valid dotted quad, else 0. + * notice: + * does not touch `dst' unless it's returning 1. + * author: + * Paul Vixie, 1996. + */ +static int +inet_pton4(const char *src, u_char *dst) +{ + const char digits[] = "0123456789"; + int saw_digit, octets, ch; + u_char tmp[NS_INADDRSZ], *tp; + + saw_digit = 0; + octets = 0; + /* cppcheck-suppress uninitvar */ + *(tp = tmp) = '\0'; + while ((ch = (unsigned char)*src++) != '\0') { + const char *pch; + + if ((pch = strchr(digits, ch)) != NULL) { + u_int new = *tp * 10 + (pch - digits); + + if (new > 255) + return (0); + if (!saw_digit) { + if (++octets > 4) + return (0); + saw_digit = 1; + } + *tp = new; + } else if (ch == '.' && saw_digit) { + if (octets == 4) + return (0); + *++tp = 0; + saw_digit = 0; + } else + return (0); + } + if (octets < 4) + return (0); + + memcpy(dst, tmp, NS_INADDRSZ); + return (1); +} + +#ifdef HAVE_STRUCT_IN6_ADDR +/* int + * inet_pton6(src, dst) + * convert presentation level address to network order binary form. + * return: + * 1 if `src' is a valid [RFC1884 2.2] address, else 0. + * notice: + * does not touch `dst' unless it's returning 1. + * credit: + * inspired by Mark Andrews. + * author: + * Paul Vixie, 1996. + */ +static int +inet_pton6(const char *src, u_char *dst) +{ + const char xdigits_l[] = "0123456789abcdef", + xdigits_u[] = "0123456789ABCDEF"; + u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; + const char *xdigits, *curtok; + int ch, saw_xdigit, count_xdigit; + u_int val; + + /* cppcheck-suppress uninitvar */ + 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; + saw_xdigit = count_xdigit = 0; + val = 0; + while ((ch = (unsigned char)*src++) != '\0') { + const char *pch; + + if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) + pch = strchr((xdigits = xdigits_u), ch); + if (pch != NULL) { + if (count_xdigit >= 4) + return (0); + val <<= 4; + val |= (pch - xdigits); + if (val > 0xffff) + return (0); + saw_xdigit = 1; + count_xdigit++; + continue; + } + if (ch == ':') { + curtok = src; + if (!saw_xdigit) { + 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; + saw_xdigit = 0; + count_xdigit = 0; + val = 0; + continue; + } + if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && + inet_pton4(curtok, tp) > 0) { + tp += NS_INADDRSZ; + saw_xdigit = 0; + count_xdigit = 0; + break; /* '\0' was seen by inet_pton4(). */ + } + return (0); + } + if (saw_xdigit) { + 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 long n = tp - colonp; + long 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); +} +#endif /* HAVE_STRUCT_IN6_ADDR */ + +/* int + * inet_pton(af, src, dst) + * convert from presentation format (which usually means ASCII printable) + * to network format (which is usually some kind of binary format). + * return: + * 1 if the address was valid for the specified address family + * 0 if the address wasn't valid (`dst' is untouched in this case) + * -1 if some other error occurred (`dst' is untouched in this case, too) + * author: + * Paul Vixie, 1996. + */ +int +sudo_inet_pton(int af, const char *src, void *dst) +{ + switch (af) { + case AF_INET: + return (inet_pton4(src, dst)); +#ifdef HAVE_STRUCT_IN6_ADDR + case AF_INET6: + return (inet_pton6(src, dst)); +#endif /* HAVE_STRUCT_IN6_ADDR */ + default: + errno = EAFNOSUPPORT; + return (-1); + } + /* NOTREACHED */ +} + +#endif /* HAVE_INET_PTON */ |