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Annotation of src/lib/libc/nameser/ns_parse.c, Revision 1.6.4.1

1.6.4.1 ! riz         1: /*     $NetBSD: ns_parse.c,v 1.8 2009/04/12 19:43:37 christos 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
1.6.4.1 ! riz        23: static const char rcsid[] = "Id: ns_parse.c,v 1.10 2009/01/23 19:59:16 each Exp";
1.2       christos   24: #else
1.6.4.1 ! riz        25: __RCSID("$NetBSD: ns_parse.c,v 1.8 2009/04/12 19:43:37 christos 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:
1.6.4.1 ! riz        57: #define PARSE_FMT_PRESO 0      /* Parse using presentation-format names */
        !            58: #define PARSE_FMT_WIRE 1       /* Parse using network-format names */
        !            59:
1.1       christos   60: /* Public. */
                     61:
                     62: /* These need to be in the same order as the nres.h:ns_flag enum. */
                     63: struct _ns_flagdata _ns_flagdata[16] = {
1.4       christos   64:        { 0x8000, 15 },         /*%< qr. */
                     65:        { 0x7800, 11 },         /*%< opcode. */
                     66:        { 0x0400, 10 },         /*%< aa. */
                     67:        { 0x0200, 9 },          /*%< tc. */
                     68:        { 0x0100, 8 },          /*%< rd. */
                     69:        { 0x0080, 7 },          /*%< ra. */
                     70:        { 0x0040, 6 },          /*%< z. */
                     71:        { 0x0020, 5 },          /*%< ad. */
                     72:        { 0x0010, 4 },          /*%< cd. */
                     73:        { 0x000f, 0 },          /*%< rcode. */
                     74:        { 0x0000, 0 },          /*%< expansion (1/6). */
                     75:        { 0x0000, 0 },          /*%< expansion (2/6). */
                     76:        { 0x0000, 0 },          /*%< expansion (3/6). */
                     77:        { 0x0000, 0 },          /*%< expansion (4/6). */
                     78:        { 0x0000, 0 },          /*%< expansion (5/6). */
                     79:        { 0x0000, 0 },          /*%< expansion (6/6). */
1.1       christos   80: };
                     81:
                     82: int ns_msg_getflag(ns_msg handle, int flag) {
1.2       christos   83:        return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
1.1       christos   84: }
                     85:
                     86: int
                     87: ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
                     88:        const u_char *optr = ptr;
                     89:
1.2       christos   90:        for (; count > 0; count--) {
1.1       christos   91:                int b, rdlength;
                     92:
                     93:                b = dn_skipname(ptr, eom);
                     94:                if (b < 0)
                     95:                        RETERR(EMSGSIZE);
                     96:                ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
                     97:                if (section != ns_s_qd) {
                     98:                        if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
                     99:                                RETERR(EMSGSIZE);
                    100:                        ptr += NS_INT32SZ/*TTL*/;
                    101:                        NS_GET16(rdlength, ptr);
                    102:                        ptr += rdlength/*RData*/;
                    103:                }
                    104:        }
                    105:        if (ptr > eom)
                    106:                RETERR(EMSGSIZE);
                    107:        return (ptr - optr);
                    108: }
                    109:
                    110: int
                    111: ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
                    112:        const u_char *eom = msg + msglen;
                    113:        int i;
                    114:
                    115:        handle->_msg = msg;
                    116:        handle->_eom = eom;
                    117:        if (msg + NS_INT16SZ > eom)
                    118:                RETERR(EMSGSIZE);
                    119:        NS_GET16(handle->_id, msg);
                    120:        if (msg + NS_INT16SZ > eom)
                    121:                RETERR(EMSGSIZE);
                    122:        NS_GET16(handle->_flags, msg);
                    123:        for (i = 0; i < ns_s_max; i++) {
                    124:                if (msg + NS_INT16SZ > eom)
                    125:                        RETERR(EMSGSIZE);
                    126:                NS_GET16(handle->_counts[i], msg);
                    127:        }
                    128:        for (i = 0; i < ns_s_max; i++)
                    129:                if (handle->_counts[i] == 0)
                    130:                        handle->_sections[i] = NULL;
                    131:                else {
                    132:                        int b = ns_skiprr(msg, eom, (ns_sect)i,
                    133:                                          handle->_counts[i]);
                    134:
                    135:                        if (b < 0)
                    136:                                return (-1);
                    137:                        handle->_sections[i] = msg;
                    138:                        msg += b;
                    139:                }
                    140:        if (msg != eom)
                    141:                RETERR(EMSGSIZE);
                    142:        setsection(handle, ns_s_max);
                    143:        return (0);
                    144: }
                    145:
                    146: int
                    147: ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
                    148:        int b;
1.4       christos  149:        int tmp;
1.1       christos  150:
                    151:        /* Make section right. */
1.4       christos  152:        tmp = section;
                    153:        if (tmp < 0 || section >= ns_s_max)
1.1       christos  154:                RETERR(ENODEV);
                    155:        if (section != handle->_sect)
                    156:                setsection(handle, section);
                    157:
                    158:        /* Make rrnum right. */
                    159:        if (rrnum == -1)
                    160:                rrnum = handle->_rrnum;
                    161:        if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
                    162:                RETERR(ENODEV);
                    163:        if (rrnum < handle->_rrnum)
                    164:                setsection(handle, section);
                    165:        if (rrnum > handle->_rrnum) {
                    166:                b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
                    167:                              rrnum - handle->_rrnum);
                    168:
                    169:                if (b < 0)
                    170:                        return (-1);
                    171:                handle->_msg_ptr += b;
                    172:                handle->_rrnum = rrnum;
                    173:        }
                    174:
                    175:        /* Do the parse. */
                    176:        b = dn_expand(handle->_msg, handle->_eom,
                    177:                      handle->_msg_ptr, rr->name, NS_MAXDNAME);
                    178:        if (b < 0)
                    179:                return (-1);
                    180:        handle->_msg_ptr += b;
                    181:        if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
                    182:                RETERR(EMSGSIZE);
                    183:        NS_GET16(rr->type, handle->_msg_ptr);
                    184:        NS_GET16(rr->rr_class, handle->_msg_ptr);
                    185:        if (section == ns_s_qd) {
                    186:                rr->ttl = 0;
                    187:                rr->rdlength = 0;
                    188:                rr->rdata = NULL;
                    189:        } else {
                    190:                if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
                    191:                        RETERR(EMSGSIZE);
                    192:                NS_GET32(rr->ttl, handle->_msg_ptr);
                    193:                NS_GET16(rr->rdlength, handle->_msg_ptr);
                    194:                if (handle->_msg_ptr + rr->rdlength > handle->_eom)
                    195:                        RETERR(EMSGSIZE);
                    196:                rr->rdata = handle->_msg_ptr;
                    197:                handle->_msg_ptr += rr->rdlength;
                    198:        }
                    199:        if (++handle->_rrnum > handle->_counts[(int)section])
                    200:                setsection(handle, (ns_sect)((int)section + 1));
                    201:
                    202:        /* All done. */
                    203:        return (0);
                    204: }
                    205:
1.6.4.1 ! riz       206: /*
        !           207:  * This is identical to the above but uses network-format (uncompressed) names.
        !           208:  */
        !           209: int
        !           210: ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) {
        !           211:        int b;
        !           212:        int tmp;
        !           213:
        !           214:        /* Make section right. */
        !           215:        tmp = section;
        !           216:        if (tmp < 0 || section >= ns_s_max)
        !           217:                RETERR(ENODEV);
        !           218:        if (section != handle->_sect)
        !           219:                setsection(handle, section);
        !           220:
        !           221:        /* Make rrnum right. */
        !           222:        if (rrnum == -1)
        !           223:                rrnum = handle->_rrnum;
        !           224:        if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
        !           225:                RETERR(ENODEV);
        !           226:        if (rrnum < handle->_rrnum)
        !           227:                setsection(handle, section);
        !           228:        if (rrnum > handle->_rrnum) {
        !           229:                b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
        !           230:                              rrnum - handle->_rrnum);
        !           231:
        !           232:                if (b < 0)
        !           233:                        return (-1);
        !           234:                handle->_msg_ptr += b;
        !           235:                handle->_rrnum = rrnum;
        !           236:        }
        !           237:
        !           238:        /* Do the parse. */
        !           239:        b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr,
        !           240:                            rr->nname, NS_MAXNNAME, &rr->nnamel);
        !           241:        if (b < 0)
        !           242:                return (-1);
        !           243:        handle->_msg_ptr += b;
        !           244:        if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
        !           245:                RETERR(EMSGSIZE);
        !           246:        NS_GET16(rr->type, handle->_msg_ptr);
        !           247:        NS_GET16(rr->rr_class, handle->_msg_ptr);
        !           248:        if (section == ns_s_qd) {
        !           249:                rr->ttl = 0;
        !           250:                rr->rdlength = 0;
        !           251:                rr->rdata = NULL;
        !           252:        } else {
        !           253:                if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
        !           254:                        RETERR(EMSGSIZE);
        !           255:                NS_GET32(rr->ttl, handle->_msg_ptr);
        !           256:                NS_GET16(rr->rdlength, handle->_msg_ptr);
        !           257:                if (handle->_msg_ptr + rr->rdlength > handle->_eom)
        !           258:                        RETERR(EMSGSIZE);
        !           259:                rr->rdata = handle->_msg_ptr;
        !           260:                handle->_msg_ptr += rr->rdlength;
        !           261:        }
        !           262:        if (++handle->_rrnum > handle->_counts[(int)section])
        !           263:                setsection(handle, (ns_sect)((int)section + 1));
        !           264:
        !           265:        /* All done. */
        !           266:        return (0);
        !           267: }
        !           268:
1.1       christos  269: /* Private. */
                    270:
                    271: static void
                    272: setsection(ns_msg *msg, ns_sect sect) {
                    273:        msg->_sect = sect;
                    274:        if (sect == ns_s_max) {
                    275:                msg->_rrnum = -1;
                    276:                msg->_msg_ptr = NULL;
                    277:        } else {
                    278:                msg->_rrnum = 0;
                    279:                msg->_msg_ptr = msg->_sections[(int)sect];
                    280:        }
                    281: }
1.4       christos  282:
                    283: /*! \file */

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