2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996-1999 by Internet Software Consortium.
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 * Based on the Dynamic DNS reference implementation by Viraj Bais
21 * <viraj_bais@ccm.fm.intel.com>
24 #if !defined(lint) && !defined(SABER)
25 static const char rcsid[] = "$Id: res_mkupdate.c,v 1.4.18.4 2005/10/14 05:44:12 marka Exp $";
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "port_before.h"
32 #include <sys/types.h>
33 #include <sys/param.h>
35 #include <netinet/in.h>
36 #include <arpa/nameser.h>
37 #include <arpa/inet.h>
43 #include <res_update.h>
54 #include "port_after.h"
56 /* Options. Leave them on. */
60 static int getnum_str(u_char **, u_char *);
61 static int gethexnum_str(u_char **, u_char *);
62 static int getword_str(char *, int, u_char **, u_char *);
63 static int getstr_str(char *, int, u_char **, u_char *);
65 #define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2);
72 int res_protocolnumber(const char *);
76 int res_servicenumber(const char *);
79 * Form update packets.
80 * Returns the size of the resulting packet if no error
84 *\li -1 if error in reading a word/number in rdata
85 * portion for update packets
86 *\li -2 if length of buffer passed is insufficient
87 *\li -3 if zone section is not the first section in
88 * the linked list, or section order has a problem
89 *\li -4 on a number overflow
90 *\li -5 unknown operation or no records
93 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
94 ns_updrec *rrecp_start = rrecp_in;
96 u_char *cp, *sp2, *startp, *endp;
97 int n, i, soanum, multiline;
100 struct in6_addr in6a;
102 u_char buf3[MAXDNAME];
103 int section, numrrs = 0, counts[ns_s_max];
104 u_int16_t rtype, rclass;
106 u_char *dnptrs[20], **dpp, **lastdnptr;
113 * Initialize header fields.
115 if ((buf == NULL) || (buflen < HFIXEDSZ))
117 memset(buf, 0, HFIXEDSZ);
119 hp->id = htons(++statp->id);
120 hp->opcode = ns_o_update;
127 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
129 if (rrecp_start == NULL)
131 else if (rrecp_start->r_section != S_ZONE)
134 memset(counts, 0, sizeof counts);
135 for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
137 section = rrecp->r_section;
138 if (section < 0 || section >= ns_s_max)
141 for (i = section + 1; i < ns_s_max; i++)
144 rtype = rrecp->r_type;
145 rclass = rrecp->r_class;
147 /* overload class and type */
148 if (section == S_PREREQ) {
150 switch (rrecp->r_opcode) {
166 if (rrecp->r_size == 0)
171 "res_mkupdate: incorrect opcode: %d\n",
176 } else if (section == S_UPDATE) {
177 switch (rrecp->r_opcode) {
179 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
185 "res_mkupdate: incorrect opcode: %d\n",
193 * XXX appending default domain to owner name is omitted,
194 * fqdn must be provided
196 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
200 ShrinkBuffer(n + 2*INT16SZ);
202 PUTSHORT(rclass, cp);
203 if (section == S_ZONE) {
204 if (numrrs != 1 || rrecp->r_type != T_SOA)
208 ShrinkBuffer(INT32SZ + INT16SZ);
210 sp2 = cp; /*%< save pointer to length byte */
212 if (rrecp->r_size == 0) {
213 if (section == S_UPDATE && rclass != C_ANY)
220 startp = rrecp->r_data;
221 endp = startp + rrecp->r_size - 1;
222 /* XXX this should be done centrally. */
223 switch (rrecp->r_type) {
225 if (!getword_str(buf2, sizeof buf2, &startp, endp))
227 if (!inet_aton(buf2, &ina))
229 n1 = ntohl(ina.s_addr);
230 ShrinkBuffer(INT32SZ);
240 if (!getword_str(buf2, sizeof buf2, &startp, endp))
242 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
251 for (i = 0; i < 2; i++) {
252 if (!getword_str(buf2, sizeof buf2, &startp,
255 n = dn_comp(buf2, cp, buflen,
262 if (rrecp->r_type == T_SOA) {
263 ShrinkBuffer(5 * INT32SZ);
264 while (isspace(*startp) || !*startp)
266 if (*startp == '(') {
271 /* serial, refresh, retry, expire, minimum */
272 for (i = 0; i < 5; i++) {
273 soanum = getnum_str(&startp, endp);
279 while (isspace(*startp) || !*startp)
289 n = getnum_str(&startp, endp);
292 ShrinkBuffer(INT16SZ);
294 if (!getword_str(buf2, sizeof buf2, &startp, endp))
296 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
303 n = getnum_str(&startp, endp);
306 ShrinkBuffer(INT16SZ);
309 n = getnum_str(&startp, endp);
312 ShrinkBuffer(INT16SZ);
315 n = getnum_str(&startp, endp);
318 ShrinkBuffer(INT16SZ);
321 if (!getword_str(buf2, sizeof buf2, &startp, endp))
323 n = dn_comp(buf2, cp, buflen, NULL, NULL);
330 n = getnum_str(&startp, endp);
334 ShrinkBuffer(INT16SZ);
335 for (i = 0; i < 2; i++) {
336 if (!getword_str(buf2, sizeof buf2, &startp,
339 n = dn_comp(buf2, cp, buflen, dnptrs,
349 unsigned int maxbm = 0;
351 if (!getword_str(buf2, sizeof buf2, &startp, endp))
353 if (!inet_aton(buf2, &ina))
355 n1 = ntohl(ina.s_addr);
356 ShrinkBuffer(INT32SZ);
359 if (!getword_str(buf2, sizeof buf2, &startp, endp))
361 if ((i = res_protocolnumber(buf2)) < 0)
366 for (i = 0; i < MAXPORT/8 ; i++)
369 while (getword_str(buf2, sizeof buf2, &startp, endp)) {
370 if ((n = res_servicenumber(buf2)) <= 0)
374 bm[n/8] |= (0x80>>(n%8));
375 if ((unsigned)n > maxbm)
382 memcpy(cp, bm, maxbm);
387 for (i = 0; i < 2; i++) {
388 if ((n = getstr_str(buf2, sizeof buf2,
401 if ((n = getstr_str(buf2, sizeof buf2,
402 &startp, endp)) < 0) {
403 if (cp != (sp2 + INT16SZ))
417 if ((n = getstr_str(buf2, sizeof buf2, &startp,
429 if ((n = getstr_str(buf2, sizeof buf2, &startp,
432 if ((n > 255) || (n == 0))
438 if ((n = getstr_str(buf2, sizeof buf2, &startp,
449 if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
458 if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
470 int sig_type, success, dateerror;
471 u_int32_t exptime, timesigned;
474 if ((n = getword_str(buf2, sizeof buf2,
477 sig_type = sym_ston(__p_type_syms, buf2, &success);
478 if (!success || sig_type == ns_t_any)
480 ShrinkBuffer(INT16SZ);
481 PUTSHORT(sig_type, cp);
483 n = getnum_str(&startp, endp);
489 n = getnum_str(&startp, endp);
490 if (n <= 0 || n > 255)
495 if (!getword_str(buf2, sizeof buf2, &startp, endp))
497 exptime = ns_datetosecs(buf2, &dateerror);
499 ShrinkBuffer(INT32SZ);
507 ottl = strtoul(buf2, &ulendp, 10);
509 (ulendp != NULL && *ulendp != '\0'))
511 ShrinkBuffer(INT32SZ);
513 if (!getword_str(buf2, sizeof buf2, &startp,
516 exptime = ns_datetosecs(buf2, &dateerror);
521 ShrinkBuffer(INT32SZ);
522 PUTLONG(exptime, cp);
524 if (!getword_str(buf2, sizeof buf2, &startp, endp))
526 timesigned = ns_datetosecs(buf2, &dateerror);
528 ShrinkBuffer(INT32SZ);
529 PUTLONG(timesigned, cp);
534 n = getnum_str(&startp, endp);
537 ShrinkBuffer(INT16SZ);
540 if (!getword_str(buf2, sizeof buf2, &startp, endp))
542 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
548 if ((n = getword_str(buf2, sizeof buf2,
551 siglen = b64_pton(buf2, buf3, sizeof(buf3));
554 ShrinkBuffer(siglen);
555 memcpy(cp, buf3, siglen);
562 n = gethexnum_str(&startp, endp);
565 ShrinkBuffer(INT16SZ);
568 n = getnum_str(&startp, endp);
574 n = getnum_str(&startp, endp);
580 if ((n = getword_str(buf2, sizeof buf2,
583 keylen = b64_pton(buf2, buf3, sizeof(buf3));
586 ShrinkBuffer(keylen);
587 memcpy(cp, buf3, keylen);
592 int success, nxt_type;
597 if (!getword_str(buf2, sizeof buf2, &startp, endp))
599 n = dn_comp(buf2, cp, buflen, NULL, NULL);
605 memset(data, 0, sizeof data);
607 if (!getword_str(buf2, sizeof buf2, &startp,
610 nxt_type = sym_ston(__p_type_syms, buf2,
612 if (!success || !ns_t_rr_p(nxt_type))
614 NS_NXT_BIT_SET(nxt_type, data);
615 if (nxt_type > maxtype)
618 n = maxtype/NS_NXT_BITS+1;
626 n = getnum_str(&startp, endp);
629 ShrinkBuffer(INT16SZ);
632 n = getnum_str(&startp, endp);
635 ShrinkBuffer(INT16SZ);
638 n = getnum_str(&startp, endp);
644 if ((n = getword_str(buf2, sizeof buf2,
647 certlen = b64_pton(buf2, buf3, sizeof(buf3));
650 ShrinkBuffer(certlen);
651 memcpy(cp, buf3, certlen);
655 if (!getword_str(buf2, sizeof buf2, &startp, endp))
657 if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
659 ShrinkBuffer(NS_IN6ADDRSZ);
660 memcpy(cp, &in6a, NS_IN6ADDRSZ);
664 /* Order Preference Flags Service Replacement Regexp */
666 n = getnum_str(&startp, endp);
667 if (n < 0 || n > 65535)
669 ShrinkBuffer(INT16SZ);
672 n = getnum_str(&startp, endp);
673 if (n < 0 || n > 65535)
675 ShrinkBuffer(INT16SZ);
678 if ((n = getstr_str(buf2, sizeof buf2,
679 &startp, endp)) < 0) {
688 /* Service Classes */
689 if ((n = getstr_str(buf2, sizeof buf2,
690 &startp, endp)) < 0) {
700 if ((n = getstr_str(buf2, sizeof buf2,
701 &startp, endp)) < 0) {
711 if (!getword_str(buf2, sizeof buf2, &startp, endp))
713 n = dn_comp(buf2, cp, buflen, NULL, NULL);
722 n = (u_int16_t)((cp - sp2) - INT16SZ);
726 hp->qdcount = htons(counts[0]);
727 hp->ancount = htons(counts[1]);
728 hp->nscount = htons(counts[2]);
729 hp->arcount = htons(counts[3]);
734 * Get a whitespace delimited word from a string (not file)
735 * into buf. modify the start pointer to point after the
736 * word in the string.
739 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
743 for (cp = buf; *startpp <= endp; ) {
745 if (isspace(c) || c == '\0') {
746 if (cp != buf) /*%< trailing whitespace */
748 else { /*%< leading whitespace */
754 if (cp >= buf+size-1)
763 * get a white spae delimited string from memory. Process quoted strings
764 * and \\DDD escapes. Return length or -1 on error. Returned string may
767 static char digits[] = "0123456789";
769 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
777 for (cp = buf; *startpp <= endp; ) {
778 if ((c = **startpp) == '\0')
780 /* leading white space */
781 if ((cp == buf) && !seen_quote && isspace(c)) {
819 (strchr(digits, c) - digits);
829 } else if (!inquote && isspace(c))
831 if (cp >= buf+size-1)
839 return ((cp == buf)? (seen_quote? 0: -1): (cp - buf));
843 * Get a whitespace delimited base 16 number from a string (not file) into buf
844 * update the start pointer to point after the number in the string.
847 gethexnum_str(u_char **startpp, u_char *endp) {
852 if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
853 return getnum_str(startpp, endp);
855 for (n = 0; *startpp <= endp; ) {
857 if (isspace(c) || c == '\0') {
858 if (seendigit) /*%< trailing whitespace */
860 else { /*%< leading whitespace */
866 while ((*startpp <= endp) &&
867 ((c = **startpp) != '\n'))
874 if (c == ')' && seendigit) {
882 n = n * 16 + (c - '0');
884 n = n * 16 + (tolower(c) - 'a' + 10);
891 * Get a whitespace delimited base 10 number from a string (not file) into buf
892 * update the start pointer to point after the number in the string.
895 getnum_str(u_char **startpp, u_char *endp) {
900 for (n = 0; *startpp <= endp; ) {
902 if (isspace(c) || c == '\0') {
903 if (seendigit) /*%< trailing whitespace */
905 else { /*%< leading whitespace */
911 while ((*startpp <= endp) &&
912 ((c = **startpp) != '\n'))
919 if (c == ')' && seendigit) {
926 n = n * 10 + (c - '0');
933 * Allocate a resource record buffer & save rr info.
936 res_mkupdrec(int section, const char *dname,
937 u_int class, u_int type, u_long ttl) {
938 ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
940 if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
945 INIT_LINK(rrecp, r_link);
946 INIT_LINK(rrecp, r_glink);
947 rrecp->r_class = (ns_class)class;
948 rrecp->r_type = (ns_type)type;
950 rrecp->r_section = (ns_sect)section;
955 * Free a resource record buffer created by res_mkupdrec.
958 res_freeupdrec(ns_updrec *rrecp) {
959 /* Note: freeing r_dp is the caller's responsibility. */
960 if (rrecp->r_dname != NULL)
961 free(rrecp->r_dname);
966 struct valuelist * next;
967 struct valuelist * prev;
972 static struct valuelist *servicelist, *protolist;
975 res_buildservicelist() {
977 struct valuelist *slp;
984 while ((sp = getservent()) != NULL) {
985 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
988 slp->name = strdup(sp->s_name);
989 slp->proto = strdup(sp->s_proto);
990 if ((slp->name == NULL) || (slp->proto == NULL)) {
991 if (slp->name) free(slp->name);
992 if (slp->proto) free(slp->proto);
996 slp->port = ntohs((u_int16_t)sp->s_port); /*%< host byt order */
997 slp->next = servicelist;
1000 servicelist->prev = slp;
1008 res_destroyservicelist() {
1009 struct valuelist *slp, *slp_next;
1011 for (slp = servicelist; slp != NULL; slp = slp_next) {
1012 slp_next = slp->next;
1017 servicelist = (struct valuelist *)0;
1025 res_buildprotolist(void) {
1026 struct protoent *pp;
1027 struct valuelist *slp;
1034 while ((pp = getprotoent()) != NULL) {
1035 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1038 slp->name = strdup(pp->p_name);
1039 if (slp->name == NULL) {
1043 slp->port = pp->p_proto; /*%< host byte order */
1044 slp->next = protolist;
1047 protolist->prev = slp;
1055 res_destroyprotolist(void) {
1056 struct valuelist *plp, *plp_next;
1058 for (plp = protolist; plp != NULL; plp = plp_next) {
1059 plp_next = plp->next;
1063 protolist = (struct valuelist *)0;
1068 findservice(const char *s, struct valuelist **list) {
1069 struct valuelist *lp = *list;
1072 for (; lp != NULL; lp = lp->next)
1073 if (strcasecmp(lp->name, s) == 0) {
1075 lp->prev->next = lp->next;
1077 lp->next->prev = lp->prev;
1082 return (lp->port); /*%< host byte order */
1084 if (sscanf(s, "%d", &n) != 1 || n <= 0)
1090 * Convert service name or (ascii) number to int.
1096 res_servicenumber(const char *p) {
1097 if (servicelist == (struct valuelist *)0)
1098 res_buildservicelist();
1099 return (findservice(p, &servicelist));
1103 * Convert protocol name or (ascii) number to int.
1109 res_protocolnumber(const char *p) {
1110 if (protolist == (struct valuelist *)0)
1111 res_buildprotolist();
1112 return (findservice(p, &protolist));
1116 static struct servent *
1117 cgetservbyport(u_int16_t port, const char *proto) { /*%< Host byte order. */
1118 struct valuelist **list = &servicelist;
1119 struct valuelist *lp = *list;
1120 static struct servent serv;
1123 for (; lp != NULL; lp = lp->next) {
1124 if (port != (u_int16_t)lp->port) /*%< Host byte order. */
1126 if (strcasecmp(lp->proto, proto) == 0) {
1128 lp->prev->next = lp->next;
1130 lp->next->prev = lp->prev;
1135 serv.s_name = lp->name;
1136 serv.s_port = htons((u_int16_t)lp->port);
1137 serv.s_proto = lp->proto;
1144 static struct protoent *
1145 cgetprotobynumber(int proto) { /*%< Host byte order. */
1146 struct valuelist **list = &protolist;
1147 struct valuelist *lp = *list;
1148 static struct protoent prot;
1150 for (; lp != NULL; lp = lp->next)
1151 if (lp->port == proto) { /*%< Host byte order. */
1153 lp->prev->next = lp->next;
1155 lp->next->prev = lp->prev;
1160 prot.p_name = lp->name;
1161 prot.p_proto = lp->port; /*%< Host byte order. */
1168 res_protocolname(int num) {
1169 static char number[8];
1170 struct protoent *pp;
1172 if (protolist == (struct valuelist *)0)
1173 res_buildprotolist();
1174 pp = cgetprotobynumber(num);
1176 (void) sprintf(number, "%d", num);
1179 return (pp->p_name);
1183 res_servicename(u_int16_t port, const char *proto) { /*%< Host byte order. */
1184 static char number[8];
1187 if (servicelist == (struct valuelist *)0)
1188 res_buildservicelist();
1189 ss = cgetservbyport(htons(port), proto);
1191 (void) sprintf(number, "%d", port);
1194 return (ss->s_name);