diff options
Diffstat (limited to 'resolv/inet_net_pton.c')
| -rw-r--r-- | resolv/inet_net_pton.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/resolv/inet_net_pton.c b/resolv/inet_net_pton.c new file mode 100644 index 0000000000..ea9b2d4b55 --- /dev/null +++ b/resolv/inet_net_pton.c @@ -0,0 +1,201 @@ +/* + * 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static const char rcsid[] = "$Id$"; +#endif + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <assert.h> +#include <ctype.h> +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> + +#ifdef SPRINTF_CHAR +# define SPRINTF(x) strlen(sprintf/**/x) +#else +# define SPRINTF(x) ((size_t)sprintf x) +#endif + +static int inet_net_pton_ipv4 __P((const char *src, u_char *dst, + size_t size)); + +/* + * static int + * inet_net_pton(af, src, dst, size) + * convert network number from presentation to network format. + * accepts hex octets, hex strings, decimal octets, and /CIDR. + * "size" is in bytes and describes "dst". + * return: + * number of bits, either imputed classfully or specified with /CIDR, + * or -1 if some failure occurred (check errno). ENOENT means it was + * not a valid network specification. + * author: + * Paul Vixie (ISC), June 1996 + */ +int +inet_net_pton(af, src, dst, size) + int af; + const char *src; + void *dst; + size_t size; +{ + switch (af) { + case AF_INET: + return (inet_net_pton_ipv4(src, dst, size)); + default: + errno = EAFNOSUPPORT; + return (-1); + } +} + +/* + * static int + * inet_net_pton_ipv4(src, dst, size) + * convert IPv4 network number from presentation to network format. + * accepts hex octets, hex strings, decimal octets, and /CIDR. + * "size" is in bytes and describes "dst". + * return: + * number of bits, either imputed classfully or specified with /CIDR, + * or -1 if some failure occurred (check errno). ENOENT means it was + * not an IPv4 network specification. + * note: + * network byte order assumed. this means 192.5.5.240/28 has + * 0x11110000 in its fourth octet. + * author: + * Paul Vixie (ISC), June 1996 + */ +static int +inet_net_pton_ipv4(src, dst, size) + const char *src; + u_char *dst; + size_t size; +{ + static const char + xdigits[] = "0123456789abcdef", + digits[] = "0123456789"; + int n, ch, tmp, dirty, bits; + const u_char *odst = dst; + + bits = -1; + ch = *src++; + + if (ch == '0' && (src[0] == 'x' || src[0] == 'X') + && isascii(src[1]) && isxdigit(src[1])) { + /* Hexadecimal: Eat nybble string. */ + if (size <= 0) + goto emsgsize; + *dst = 0, dirty = 0; + src++; /* skip x or X. */ + while ((ch = *src++) != '\0' && + isascii(ch) && isxdigit(ch)) { + if (isupper(ch)) + ch = tolower(ch); + n = strchr(xdigits, ch) - xdigits; + assert(n >= 0 && n <= 15); + *dst |= n; + if (!dirty++) + *dst <<= 4; + else if (size-- > 0) + *++dst = 0, dirty = 0; + else + goto emsgsize; + } + if (dirty) + size--; + } else if (isascii(ch) && isdigit(ch)) { + /* Decimal: eat dotted digit string. */ + for (;;) { + tmp = 0; + do { + n = strchr(digits, ch) - digits; + assert(n >= 0 && n <= 9); + tmp *= 10; + tmp += n; + if (tmp > 255) + goto enoent; + } while ((ch = *src++) != '\0' && + isascii(ch) && isdigit(ch)); + if (size-- <= 0) + goto emsgsize; + *dst++ = (u_char) tmp; + if (ch == '\0' || ch == '/') + break; + if (ch != '.') + goto enoent; + ch = *src++; + if (!isascii(ch) || !isdigit(ch)) + goto enoent; + } + } else + goto enoent; + + if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) { + /* CIDR width specifier. Nothing can follow it. */ + ch = *src++; /* Skip over the /. */ + bits = 0; + do { + n = strchr(digits, ch) - digits; + assert(n >= 0 && n <= 9); + bits *= 10; + bits += n; + } while ((ch = *src++) != '\0' && + isascii(ch) && isdigit(ch)); + if (ch != '\0') + goto enoent; + } + + /* Firey death and destruction unless we prefetched EOS. */ + if (ch != '\0') + goto enoent; + + /* If nothing was written to the destination, we found no address. */ + if (dst == odst) + goto enoent; + /* If no CIDR spec was given, infer width from net class. */ + if (bits == -1) { + if (*odst >= 224) + bits = 4; + else if (*odst >= 192) + bits = 24; + else if (*odst >= 128) + bits = 16; + else + bits = 8; + } + /* Extend network to cover the actual mask. */ + while (bits > ((dst - odst) * 8)) { + if (size-- <= 0) + goto emsgsize; + *dst++ = '\0'; + } + return (bits); + + enoent: + errno = ENOENT; + return (-1); + + emsgsize: + errno = EMSGSIZE; + return (-1); +} |