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Annotation of src/lib/libc/nameser/ns_parse.c, Revision 1.6

1.6     ! christos    1: /*     $NetBSD: ns_parse.c,v 1.5 2007/03/30 20:23:03 ghen Exp $        */
1.1       christos    2:
                      3: /*
                      4:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                      5:  * Copyright (c) 1996,1999 by Internet Software Consortium.
                      6:  *
                      7:  * Permission to use, copy, modify, and distribute this software for any
                      8:  * purpose with or without fee is hereby granted, provided that the above
                      9:  * copyright notice and this permission notice appear in all copies.
                     10:  *
                     11:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     13:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     17:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     18:  */
                     19:
1.2       christos   20: #include <sys/cdefs.h>
1.1       christos   21: #ifndef lint
1.2       christos   22: #ifdef notdef
1.6     ! christos   23: static const char rcsid[] = "Id: ns_parse.c,v 1.9 2007/08/27 03:32:26 marka Exp";
1.2       christos   24: #else
1.6     ! christos   25: __RCSID("$NetBSD: ns_parse.c,v 1.5 2007/03/30 20:23:03 ghen Exp $");
1.2       christos   26: #endif
1.1       christos   27: #endif
                     28:
                     29: /* Import. */
                     30:
                     31: #include "port_before.h"
                     32:
                     33: #include <sys/types.h>
                     34:
                     35: #include <netinet/in.h>
                     36: #include <arpa/nameser.h>
                     37:
                     38: #include <errno.h>
                     39: #include <resolv.h>
                     40: #include <string.h>
                     41:
                     42: #include "port_after.h"
                     43:
                     44: /* Forward. */
                     45:
                     46: static void    setsection(ns_msg *msg, ns_sect sect);
                     47:
                     48: /* Macros. */
                     49:
1.6     ! christos   50: #if !defined(SOLARIS2) || defined(__COVERITY__)
1.2       christos   51: #define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0)
1.4       christos   52: #else
                     53: #define RETERR(err) \
                     54:        do { errno = (err); if (errno == errno) return (-1); } while (0)
                     55: #endif
1.1       christos   56:
                     57: /* Public. */
                     58:
                     59: /* These need to be in the same order as the nres.h:ns_flag enum. */
                     60: struct _ns_flagdata _ns_flagdata[16] = {
1.4       christos   61:        { 0x8000, 15 },         /*%< qr. */
                     62:        { 0x7800, 11 },         /*%< opcode. */
                     63:        { 0x0400, 10 },         /*%< aa. */
                     64:        { 0x0200, 9 },          /*%< tc. */
                     65:        { 0x0100, 8 },          /*%< rd. */
                     66:        { 0x0080, 7 },          /*%< ra. */
                     67:        { 0x0040, 6 },          /*%< z. */
                     68:        { 0x0020, 5 },          /*%< ad. */
                     69:        { 0x0010, 4 },          /*%< cd. */
                     70:        { 0x000f, 0 },          /*%< rcode. */
                     71:        { 0x0000, 0 },          /*%< expansion (1/6). */
                     72:        { 0x0000, 0 },          /*%< expansion (2/6). */
                     73:        { 0x0000, 0 },          /*%< expansion (3/6). */
                     74:        { 0x0000, 0 },          /*%< expansion (4/6). */
                     75:        { 0x0000, 0 },          /*%< expansion (5/6). */
                     76:        { 0x0000, 0 },          /*%< expansion (6/6). */
1.1       christos   77: };
                     78:
                     79: int ns_msg_getflag(ns_msg handle, int flag) {
1.2       christos   80:        return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
1.1       christos   81: }
                     82:
                     83: int
                     84: ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
                     85:        const u_char *optr = ptr;
                     86:
1.2       christos   87:        for (; count > 0; count--) {
1.1       christos   88:                int b, rdlength;
                     89:
                     90:                b = dn_skipname(ptr, eom);
                     91:                if (b < 0)
                     92:                        RETERR(EMSGSIZE);
                     93:                ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
                     94:                if (section != ns_s_qd) {
                     95:                        if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
                     96:                                RETERR(EMSGSIZE);
                     97:                        ptr += NS_INT32SZ/*TTL*/;
                     98:                        NS_GET16(rdlength, ptr);
                     99:                        ptr += rdlength/*RData*/;
                    100:                }
                    101:        }
                    102:        if (ptr > eom)
                    103:                RETERR(EMSGSIZE);
                    104:        return (ptr - optr);
                    105: }
                    106:
                    107: int
                    108: ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
                    109:        const u_char *eom = msg + msglen;
                    110:        int i;
                    111:
                    112:        memset(handle, 0x5e, sizeof *handle);
                    113:        handle->_msg = msg;
                    114:        handle->_eom = eom;
                    115:        if (msg + NS_INT16SZ > eom)
                    116:                RETERR(EMSGSIZE);
                    117:        NS_GET16(handle->_id, msg);
                    118:        if (msg + NS_INT16SZ > eom)
                    119:                RETERR(EMSGSIZE);
                    120:        NS_GET16(handle->_flags, msg);
                    121:        for (i = 0; i < ns_s_max; i++) {
                    122:                if (msg + NS_INT16SZ > eom)
                    123:                        RETERR(EMSGSIZE);
                    124:                NS_GET16(handle->_counts[i], msg);
                    125:        }
                    126:        for (i = 0; i < ns_s_max; i++)
                    127:                if (handle->_counts[i] == 0)
                    128:                        handle->_sections[i] = NULL;
                    129:                else {
                    130:                        int b = ns_skiprr(msg, eom, (ns_sect)i,
                    131:                                          handle->_counts[i]);
                    132:
                    133:                        if (b < 0)
                    134:                                return (-1);
                    135:                        handle->_sections[i] = msg;
                    136:                        msg += b;
                    137:                }
                    138:        if (msg != eom)
                    139:                RETERR(EMSGSIZE);
                    140:        setsection(handle, ns_s_max);
                    141:        return (0);
                    142: }
                    143:
                    144: int
                    145: ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
                    146:        int b;
1.4       christos  147:        int tmp;
1.1       christos  148:
                    149:        /* Make section right. */
1.4       christos  150:        tmp = section;
                    151:        if (tmp < 0 || section >= ns_s_max)
1.1       christos  152:                RETERR(ENODEV);
                    153:        if (section != handle->_sect)
                    154:                setsection(handle, section);
                    155:
                    156:        /* Make rrnum right. */
                    157:        if (rrnum == -1)
                    158:                rrnum = handle->_rrnum;
                    159:        if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
                    160:                RETERR(ENODEV);
                    161:        if (rrnum < handle->_rrnum)
                    162:                setsection(handle, section);
                    163:        if (rrnum > handle->_rrnum) {
                    164:                b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
                    165:                              rrnum - handle->_rrnum);
                    166:
                    167:                if (b < 0)
                    168:                        return (-1);
                    169:                handle->_msg_ptr += b;
                    170:                handle->_rrnum = rrnum;
                    171:        }
                    172:
                    173:        /* Do the parse. */
                    174:        b = dn_expand(handle->_msg, handle->_eom,
                    175:                      handle->_msg_ptr, rr->name, NS_MAXDNAME);
                    176:        if (b < 0)
                    177:                return (-1);
                    178:        handle->_msg_ptr += b;
                    179:        if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
                    180:                RETERR(EMSGSIZE);
                    181:        NS_GET16(rr->type, handle->_msg_ptr);
                    182:        NS_GET16(rr->rr_class, handle->_msg_ptr);
                    183:        if (section == ns_s_qd) {
                    184:                rr->ttl = 0;
                    185:                rr->rdlength = 0;
                    186:                rr->rdata = NULL;
                    187:        } else {
                    188:                if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
                    189:                        RETERR(EMSGSIZE);
                    190:                NS_GET32(rr->ttl, handle->_msg_ptr);
                    191:                NS_GET16(rr->rdlength, handle->_msg_ptr);
                    192:                if (handle->_msg_ptr + rr->rdlength > handle->_eom)
                    193:                        RETERR(EMSGSIZE);
                    194:                rr->rdata = handle->_msg_ptr;
                    195:                handle->_msg_ptr += rr->rdlength;
                    196:        }
                    197:        if (++handle->_rrnum > handle->_counts[(int)section])
                    198:                setsection(handle, (ns_sect)((int)section + 1));
                    199:
                    200:        /* All done. */
                    201:        return (0);
                    202: }
                    203:
                    204: /* Private. */
                    205:
                    206: static void
                    207: setsection(ns_msg *msg, ns_sect sect) {
                    208:        msg->_sect = sect;
                    209:        if (sect == ns_s_max) {
                    210:                msg->_rrnum = -1;
                    211:                msg->_msg_ptr = NULL;
                    212:        } else {
                    213:                msg->_rrnum = 0;
                    214:                msg->_msg_ptr = msg->_sections[(int)sect];
                    215:        }
                    216: }
1.4       christos  217:
                    218: /*! \file */

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