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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [ns_parse.c] - Blame information for rev 30

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1 30 unneback
/*
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 * Copyright (c) 1996 by Internet Software Consortium.
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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 * SOFTWARE.
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 */
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#if !defined(__rtems__)
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#if !defined(LINT) && !defined(CODECENTER)
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static char rcsid[] = "$Id: ns_parse.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
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#endif /* not lint */
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#endif /* not rtems */
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <resolv.h>
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#include <string.h>
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/* These need to be in the same order as the nres.h:ns_flag enum. */
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struct _ns_flagdata _ns_flagdata[16] = {
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        { 0x8000, 15 },         /* qr. */
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        { 0x7800, 11 },         /* opcode. */
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        { 0x0400, 10 },         /* aa. */
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        { 0x0200, 9 },          /* tc. */
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        { 0x0100, 8 },          /* rd. */
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        { 0x0080, 7 },          /* ra. */
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        { 0x0040, 6 },          /* z. */
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        { 0x0020, 5 },          /* ad. */
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        { 0x0010, 4 },          /* cd. */
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        { 0x000f, 0 },           /* rcode. */
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        { 0x0000, 0 },           /* expansion (1/6). */
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        { 0x0000, 0 },           /* expansion (2/6). */
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        { 0x0000, 0 },           /* expansion (3/6). */
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        { 0x0000, 0 },           /* expansion (4/6). */
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        { 0x0000, 0 },           /* expansion (5/6). */
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        { 0x0000, 0 },           /* expansion (6/6). */
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};
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static int
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skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
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        const u_char *optr = ptr;
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        for ((void)NULL; count > 0; count--) {
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                int b, rdlength;
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                b = dn_skipname(ptr, eom);
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                if (b < 0)
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                        goto emsgsize;
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                ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
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                if (section != ns_s_qd) {
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                        if (ptr + NS_INT32SZ > eom)
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                                goto emsgsize;
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                        ptr += NS_INT32SZ/*TTL*/;
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                        if (ptr + NS_INT16SZ > eom)
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                                goto emsgsize;
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                        NS_GET16(rdlength, ptr);
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                        ptr += rdlength/*RData*/;
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                }
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        }
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        if (ptr > eom)
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                goto emsgsize;
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        return (ptr - optr);
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 emsgsize:
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        errno = EMSGSIZE;
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        return (-1);
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}
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int
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ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
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        const u_char *eom = msg + msglen;
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        int i;
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        memset(handle, 0x5e, sizeof *handle);
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        handle->_msg = msg;
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        handle->_eom = eom;
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        if (msg + NS_INT16SZ > eom)
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                goto emsgsize;
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        NS_GET16(handle->_id, msg);
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        if (msg + NS_INT16SZ > eom)
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                goto emsgsize;
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        NS_GET16(handle->_flags, msg);
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        for (i = 0; i < ns_s_max; i++) {
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                if (msg + NS_INT16SZ > eom)
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                        goto emsgsize;
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                NS_GET16(handle->_counts[i], msg);
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        }
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        for (i = 0; i < ns_s_max; i++)
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                if (handle->_counts[i] == 0)
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                        handle->_sections[i] = NULL;
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                else {
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                        int b = skiprr(msg, eom, (ns_sect)i,
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                                       handle->_counts[i]);
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                        if (b < 0)
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                                return (-1);
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                        handle->_sections[i] = msg;
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                        msg += b;
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                }
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        if (msg != eom)
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                goto emsgsize;
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        handle->_sect = ns_s_max;
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        handle->_rrnum = -1;
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        handle->_ptr = NULL;
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        return (0);
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 emsgsize:
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        errno = EMSGSIZE;
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        return (-1);
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}
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int
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ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
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        int b;
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        /* Make section right. */
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        if (section < 0 || section >= ns_s_max)
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                goto enodev;
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        if ((int)section != (int)handle->_sect) {
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                handle->_sect = section;
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                handle->_rrnum = 0;
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                handle->_ptr = handle->_sections[(int)section];
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        }
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        /* Make rrnum right. */
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        if (rrnum == -1)
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                rrnum = handle->_rrnum;
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        if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
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                goto enodev;
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        if (rrnum < handle->_rrnum) {
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                handle->_rrnum = 0;
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                handle->_ptr = handle->_sections[(int)section];
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        }
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        b = skiprr(handle->_msg, handle->_eom, section,
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                   rrnum - handle->_rrnum);
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        if (b < 0)
150
                return (-1);
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        handle->_ptr += b;
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        handle->_rrnum = rrnum;
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154
        /* Do the parse. */
155
        b = dn_expand(handle->_msg, handle->_eom,
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                      handle->_ptr, rr->name, NS_MAXDNAME);
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        if (b < 0)
158
                return (-1);
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        handle->_ptr += b;
160
        if (handle->_ptr + NS_INT16SZ > handle->_eom)
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                goto emsgsize;
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        NS_GET16(rr->type, handle->_ptr);
163
        if (handle->_ptr + NS_INT16SZ > handle->_eom)
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                goto emsgsize;
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        NS_GET16(rr->class, handle->_ptr);
166
        if (section == ns_s_qd) {
167
                rr->ttl = 0;
168
                rr->rdlength = 0;
169
                rr->rdata = NULL;
170
        } else {
171
                if (handle->_ptr + NS_INT32SZ > handle->_eom)
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                        goto emsgsize;
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                NS_GET32(rr->ttl, handle->_ptr);
174
                if (handle->_ptr + NS_INT16SZ > handle->_eom)
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                        goto emsgsize;
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                NS_GET16(rr->rdlength, handle->_ptr);
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                if (handle->_ptr + rr->rdlength > handle->_eom)
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                        goto emsgsize;
179
                rr->rdata = handle->_ptr;
180
                handle->_ptr += rr->rdlength;
181
        }
182
        handle->_rrnum++;
183
 
184
        /* All done. */
185
        return (0);
186
 enodev:
187
        errno = ENODEV;
188
        return (-1);
189
 emsgsize:
190
        errno = EMSGSIZE;
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        return (-1);
192
}

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