Fix a bug about the iSCSI DHCP dependency issue.

[mirror_edk2.git] / StdLib / BsdSocketLib / res_comp.c

/*\r
 * Copyright (c) 1985, 1993\r
 *    The Regents of the University of California.  All rights reserved.\r
 *\r
 * Portions copyright (c) 1999, 2000\r
 * Intel Corporation.\r
 * All rights reserved.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 *\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 *\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 *\r
 * 3. All advertising materials mentioning features or use of this software\r
 *    must display the following acknowledgement:\r
 *\r
 *    This product includes software developed by the University of\r
 *    California, Berkeley, Intel Corporation, and its contributors.\r
 *\r
 * 4. Neither the name of University, Intel Corporation, or their respective\r
 *    contributors may be used to endorse or promote products derived from\r
 *    this software without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND\r
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,\r
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS\r
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,\r
 * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,\r
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\r
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\r
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\r
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\r
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r
 *\r
 */\r
\r
/*\r
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.\r
 *\r
 * Permission to use, copy, modify, and distribute this software for any\r
 * purpose with or without fee is hereby granted, provided that the above\r
 * copyright notice and this permission notice appear in all copies, and that\r
 * the name of Digital Equipment Corporation not be used in advertising or\r
 * publicity pertaining to distribution of the document or software without\r
 * specific, written prior permission.\r
 *\r
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL\r
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES\r
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT\r
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL\r
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR\r
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS\r
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS\r
 * SOFTWARE.\r
 */\r
\r
/*\r
 * Portions Copyright (c) 1996 by Internet Software Consortium.\r
 *\r
 * Permission to use, copy, modify, and distribute this software for any\r
 * purpose with or without fee is hereby granted, provided that the above\r
 * copyright notice and this permission notice appear in all copies.\r
 *\r
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS\r
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES\r
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE\r
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL\r
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR\r
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS\r
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS\r
 * SOFTWARE.\r
 */\r
\r
#if defined(LIBC_SCCS) && !defined(lint)\r
static char sccsid[] = "@(#)res_comp.c  8.1 (Berkeley) 6/4/93";\r
static char orig_rcsid[] = "From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $";\r
static char rcsid[] = "$Id: res_comp.c,v 1.1.1.1 2003/11/19 01:51:35 kyu3 Exp $";\r
#endif /* LIBC_SCCS and not lint */\r
\r
#include <sys/types.h>\r
#include <sys/param.h>\r
#include <netinet/in.h>\r
#include <arpa/nameser.h>\r
#include <ctype.h>\r
#include <resolv.h>\r
#include <stdio.h>\r
#include <string.h>\r
#include <unistd.h>\r
\r
#define BIND_4_COMPAT\r
\r
/*\r
 * Expand compressed domain name 'comp_dn' to full domain name.\r
 * 'msg' is a pointer to the begining of the message,\r
 * 'eomorig' points to the first location after the message,\r
 * 'exp_dn' is a pointer to a buffer of size 'length' for the result.\r
 * Return size of compressed name or -1 if there was an error.\r
 */\r
int\r
dn_expand(const u_char *msg, const u_char *eom, const u_char *src,\r
      char *dst, int dstsiz)\r
{\r
    int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);\r
\r
    if (n > 0 && dst[0] == '.')\r
        dst[0] = '\0';\r
    return (n);\r
}\r
\r
/*\r
 * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.\r
 * Return the size of the compressed name or -1.\r
 * 'length' is the size of the array pointed to by 'comp_dn'.\r
 */\r
int\r
dn_comp(const char *src, u_char *dst, int dstsiz,\r
    u_char **dnptrs, u_char **lastdnptr)\r
{\r
    return (ns_name_compress(src, dst, (size_t)dstsiz,\r
                 (const u_char **)dnptrs,\r
                 (const u_char **)lastdnptr));\r
}\r
\r
/*\r
 * Skip over a compressed domain name. Return the size or -1.\r
 */\r
int\r
dn_skipname(const u_char *ptr, const u_char *eom) {\r
    const u_char *saveptr = ptr;\r
\r
    if (ns_name_skip(&ptr, eom) == -1)\r
        return (-1);\r
    return ((int)(ptr - saveptr));\r
}\r
\r
/*\r
 * Verify that a domain name uses an acceptable character set.\r
 */\r
\r
/*\r
 * Note the conspicuous absence of ctype macros in these definitions.  On\r
 * non-ASCII hosts, we can't depend on string literals or ctype macros to\r
 * tell us anything about network-format data.  The rest of the BIND system\r
 * is not careful about this, but for some reason, we're doing it right here.\r
 */\r
#define PERIOD 0x2e\r
#define hyphenchar(c) ((c) == 0x2d)\r
#define bslashchar(c) ((c) == 0x5c)\r
#define periodchar(c) ((c) == PERIOD)\r
#define asterchar(c) ((c) == 0x2a)\r
#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \\r
           || ((c) >= 0x61 && (c) <= 0x7a))\r
#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)\r
\r
#define borderchar(c) (alphachar(c) || digitchar(c))\r
#define middlechar(c) (borderchar(c) || hyphenchar(c))\r
#define domainchar(c) ((c) > 0x20 && (c) < 0x7f)\r
\r
int\r
res_hnok(\r
    const char *dn\r
    )\r
{\r
    int ppch = '\0', pch = PERIOD, ch = *dn++;\r
\r
    while (ch != '\0') {\r
        int nch = *dn++;\r
\r
        if (periodchar(ch)) {\r
            (void)NULL;\r
        } else if (periodchar(pch)) {\r
            if (!borderchar(ch))\r
                return (0);\r
        } else if (periodchar(nch) || nch == '\0') {\r
            if (!borderchar(ch))\r
                return (0);\r
        } else {\r
            if (!middlechar(ch))\r
                return (0);\r
        }\r
        ppch = pch, pch = ch, ch = nch;\r
    }\r
    return (1);\r
}\r
\r
/*\r
 * hostname-like (A, MX, WKS) owners can have "*" as their first label\r
 * but must otherwise be as a host name.\r
 */\r
int\r
res_ownok(\r
    const char *dn\r
    )\r
{\r
    if (asterchar(dn[0])) {\r
        if (periodchar(dn[1]))\r
            return (res_hnok(dn+2));\r
        if (dn[1] == '\0')\r
            return (1);\r
    }\r
    return (res_hnok(dn));\r
}\r
\r
/*\r
 * SOA RNAMEs and RP RNAMEs can have any printable character in their first\r
 * label, but the rest of the name has to look like a host name.\r
 */\r
int\r
res_mailok(\r
    const char *dn\r
    )\r
{\r
    int ch, escaped = 0;\r
\r
    /* "." is a valid missing representation */\r
    if (*dn == '\0')\r
        return (1);\r
\r
    /* otherwise <label>.<hostname> */\r
    while ((ch = *dn++) != '\0') {\r
        if (!domainchar(ch))\r
            return (0);\r
        if (!escaped && periodchar(ch))\r
            break;\r
        if (escaped)\r
            escaped = 0;\r
        else if (bslashchar(ch))\r
            escaped = 1;\r
    }\r
    if (periodchar(ch))\r
        return (res_hnok(dn));\r
    return (0);\r
}\r
\r
/*\r
 * This function is quite liberal, since RFC 1034's character sets are only\r
 * recommendations.\r
 */\r
int\r
res_dnok(\r
    const char *dn\r
    )\r
{\r
    int ch;\r
\r
    while ((ch = *dn++) != '\0')\r
        if (!domainchar(ch))\r
            return (0);\r
    return (1);\r
}\r
\r
#ifdef BIND_4_COMPAT\r
/*\r
 * This module must export the following externally-visible symbols:\r
 *    ___putlong\r
 *    ___putshort\r
 *    __getlong\r
 *    __getshort\r
 * Note that one _ comes from C and the others come from us.\r
 */\r
void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }\r
void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }\r
u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }\r
u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }\r
#endif /*BIND_4_COMPAT*/\r