From 00dc413fb95614f851ceefad8c6dc219e823effd Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Fri, 4 May 2001 23:39:15 +0000 Subject: Add in inet_ntop() and inet_pton() -- ported from glibc 2.2.3 by Cory Visi --- libc/inet/ntop.c | 400 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 400 insertions(+) create mode 100644 libc/inet/ntop.c (limited to 'libc') diff --git a/libc/inet/ntop.c b/libc/inet/ntop.c new file mode 100644 index 000000000..09e3ad8bb --- /dev/null +++ b/libc/inet/ntop.c @@ -0,0 +1,400 @@ +/* + * 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 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 +#include +#include + +#include +#include +#include + +#include +#include +#include + +/* + * 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. + */ + + +/* const char * + * inet_ntop4(src, dst, size) + * format an IPv4 address + * return: + * `dst' (as a const) + * notes: + * (1) uses no statics + * (2) takes a u_char* not an in_addr as input + * author: + * Paul Vixie, 1996. + */ +static const char * +inet_ntop4(src, dst, size) + const u_char *src; + char *dst; + socklen_t size; +{ + char tmp[sizeof ("255.255.255.255") + 1] = "\0"; + int octet; + int i; + + i = 0; + for (octet = 0; octet <= 3; octet++) { + + if (src[octet] > 255) { + __set_errno (ENOSPC); + return (NULL); + } + tmp[i++] = '0' + src[octet] / 100; + if (tmp[i - 1] == '0') { + tmp[i - 1] = '0' + (src[octet] / 10 % 10); + if (tmp[i - 1] == '0') i--; + } else { + tmp[i++] = '0' + (src[octet] / 10 % 10); + } + tmp[i++] = '0' + src[octet] % 10; + tmp[i++] = '.'; + } + tmp[i - 1] = '\0'; + + if (strlen (tmp) > size) { + __set_errno (ENOSPC); + return (NULL); + } + + return strcpy(dst, tmp); +} + + +/* const char * + * inet_ntop6(src, dst, size) + * convert IPv6 binary address into presentation (printable) format + * author: + * Paul Vixie, 1996. + */ + +#ifdef INET_IPV6 + +static const char * +inet_ntop6(src, dst, size) + const u_char *src; + char *dst; + socklen_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[sizeof ("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp; + struct { int base, len; } best, cur; + u_int words[8]; + 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 < 16; i += 2) + words[i / 2] = (src[i] << 8) | src[i + 1]; + best.base = -1; + cur.base = -1; + for (i = 0; i < 8; 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 < 8; 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 == 5 && words[5] == 0xffff))) { + if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) + return (NULL); + 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) == 8) + *tp++ = ':'; + *tp++ = '\0'; + + /* + * Check for overflow, copy, and we're done. + */ + if ((socklen_t)(tp - tmp) > size) { + __set_errno (ENOSPC); + return (NULL); + } + return strcpy(dst, tmp); +} +#endif /* INET_IPV6 */ + + +/* 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(src, dst) + const char *src; + u_char *dst; +{ + int saw_digit, octets, ch; + u_char tmp[4], *tp; + + saw_digit = 0; + octets = 0; + *(tp = tmp) = 0; + while ((ch = *src++) != '\0') { + + if (ch >= '0' && ch <= '9') { + u_int new = *tp * 10 + (ch - '0'); + + if (new > 255) + return (0); + *tp = new; + if (! saw_digit) { + if (++octets > 4) + return (0); + saw_digit = 1; + } + } 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, 4); + return (1); +} + +/* 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: + * (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. + */ + +#ifdef INET_IPV6 + +static int +inet_pton6(src, dst) + const char *src; + u_char *dst; +{ + static const char xdigits[] = "0123456789abcdef"; + u_char tmp[16], *tp, *endp, *colonp; + const char *curtok; + int ch, saw_xdigit; + u_int val; + + tp = memset(tmp, '\0', 16); + endp = tp + 16; + colonp = NULL; + /* Leading :: requires some special handling. */ + if (*src == ':') + if (*++src != ':') + return (0); + curtok = src; + saw_xdigit = 0; + val = 0; + while ((ch = tolower (*src++)) != '\0') { + const char *pch; + + pch = strchr(xdigits, ch); + if (pch != NULL) { + val <<= 4; + val |= (pch - xdigits); + if (val > 0xffff) + return (0); + saw_xdigit = 1; + continue; + } + if (ch == ':') { + curtok = src; + if (!saw_xdigit) { + if (colonp) + return (0); + colonp = tp; + continue; + } else if (*src == '\0') { + return (0); + } + if (tp + 2 > endp) + return (0); + *tp++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_char) val & 0xff; + saw_xdigit = 0; + val = 0; + continue; + } + if (ch == '.' && ((tp + 4) <= endp) && + inet_pton4(curtok, tp) > 0) { + tp += 4; + saw_xdigit = 0; + break; /* '\0' was seen by inet_pton4(). */ + } + return (0); + } + if (saw_xdigit) { + if (tp + 2 > 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 int 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, 16); + return (1); +} + +#endif /* INET_IPV6 */ + + + +/* char * + * inet_ntop(af, src, dst, size) + * convert a network format address to presentation format. + * return: + * pointer to presentation format address (`dst'), or NULL (see errno). + * author: + * Paul Vixie, 1996. + */ +extern const char * +inet_ntop(af, src, dst, size) + int af; + const void *src; + char *dst; + socklen_t size; +{ + switch (af) { + case AF_INET: + return (inet_ntop4(src, dst, size)); +#ifdef INET_IPV6 + case AF_INET6: + return (inet_ntop6(src, dst, size)); +#endif + default: + __set_errno (EAFNOSUPPORT); + return (NULL); + } + /* NOTREACHED */ +} + + +/* 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. + */ +extern int +inet_pton(af, src, dst) + int af; + const char *src; + void *dst; +{ + switch (af) { + case AF_INET: + return (inet_pton4(src, dst)); +#ifdef INET_IPV6 + case AF_INET6: + return (inet_pton6(src, dst)); +#endif + default: + __set_errno (EAFNOSUPPORT); + return (-1); + } + /* NOTREACHED */ +} + -- cgit v1.2.3