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.
19 * Based on the Dynamic DNS reference implementation by Viraj Bais
20 * <viraj_bais@ccm.fm.intel.com>
23 #if !defined(lint) && !defined(SABER)
24 static const char rcsid[] = "$Id: res_mkupdate.c,v 1.1.2.1.4.5 2005/10/14 05:43:47 marka Exp $";
27 #include "port_before.h"
29 #include <sys/types.h>
30 #include <sys/param.h>
32 #include <netinet/in.h>
33 #include <arpa/nameser.h>
34 #include <arpa/inet.h>
40 #include <res_update.h>
50 #include "port_after.h"
52 /* Options. Leave them on. */
56 static int getnum_str(u_char **, u_char *);
57 static int gethexnum_str(u_char **, u_char *);
58 static int getword_str(char *, int, u_char **, u_char *);
59 static int getstr_str(char *, int, u_char **, u_char *);
61 #define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2);
67 int res_protocolnumber(const char *);
71 int res_servicenumber(const char *);
74 * Form update packets.
75 * Returns the size of the resulting packet if no error
77 * returns -1 if error in reading a word/number in rdata
78 * portion for update packets
79 * -2 if length of buffer passed is insufficient
80 * -3 if zone section is not the first section in
81 * the linked list, or section order has a problem
82 * -4 on a number overflow
83 * -5 unknown operation or no records
86 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
87 ns_updrec *rrecp_start = rrecp_in;
89 u_char *cp, *sp2, *startp, *endp;
90 int n, i, soanum, multiline;
95 u_char buf3[MAXDNAME];
96 int section, numrrs = 0, counts[ns_s_max];
97 u_int16_t rtype, rclass;
99 u_char *dnptrs[20], **dpp, **lastdnptr;
106 * Initialize header fields.
108 if ((buf == NULL) || (buflen < HFIXEDSZ))
110 memset(buf, 0, HFIXEDSZ);
112 hp->id = htons(++statp->id);
113 hp->opcode = ns_o_update;
120 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
122 if (rrecp_start == NULL)
124 else if (rrecp_start->r_section != S_ZONE)
127 memset(counts, 0, sizeof counts);
128 for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
130 section = rrecp->r_section;
131 if (section < 0 || section >= ns_s_max)
134 for (i = section + 1; i < ns_s_max; i++)
137 rtype = rrecp->r_type;
138 rclass = rrecp->r_class;
140 /* overload class and type */
141 if (section == S_PREREQ) {
143 switch (rrecp->r_opcode) {
159 if (rrecp->r_size == 0)
164 "res_mkupdate: incorrect opcode: %d\n",
169 } else if (section == S_UPDATE) {
170 switch (rrecp->r_opcode) {
172 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
178 "res_mkupdate: incorrect opcode: %d\n",
186 * XXX appending default domain to owner name is omitted,
187 * fqdn must be provided
189 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
193 ShrinkBuffer(n + 2*INT16SZ);
195 PUTSHORT(rclass, cp);
196 if (section == S_ZONE) {
197 if (numrrs != 1 || rrecp->r_type != T_SOA)
201 ShrinkBuffer(INT32SZ + INT16SZ);
203 sp2 = cp; /* save pointer to length byte */
205 if (rrecp->r_size == 0) {
206 if (section == S_UPDATE && rclass != C_ANY)
213 startp = rrecp->r_data;
214 endp = startp + rrecp->r_size - 1;
215 /* XXX this should be done centrally. */
216 switch (rrecp->r_type) {
218 if (!getword_str(buf2, sizeof buf2, &startp, endp))
220 if (!inet_aton(buf2, &ina))
222 n1 = ntohl(ina.s_addr);
223 ShrinkBuffer(INT32SZ);
233 if (!getword_str(buf2, sizeof buf2, &startp, endp))
235 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
244 for (i = 0; i < 2; i++) {
245 if (!getword_str(buf2, sizeof buf2, &startp,
248 n = dn_comp(buf2, cp, buflen,
255 if (rrecp->r_type == T_SOA) {
256 ShrinkBuffer(5 * INT32SZ);
257 while (isspace(*startp) || !*startp)
259 if (*startp == '(') {
264 /* serial, refresh, retry, expire, minimum */
265 for (i = 0; i < 5; i++) {
266 soanum = getnum_str(&startp, endp);
272 while (isspace(*startp) || !*startp)
282 n = getnum_str(&startp, endp);
285 ShrinkBuffer(INT16SZ);
287 if (!getword_str(buf2, sizeof buf2, &startp, endp))
289 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
296 n = getnum_str(&startp, endp);
299 ShrinkBuffer(INT16SZ);
302 n = getnum_str(&startp, endp);
305 ShrinkBuffer(INT16SZ);
308 n = getnum_str(&startp, endp);
311 ShrinkBuffer(INT16SZ);
314 if (!getword_str(buf2, sizeof buf2, &startp, endp))
316 n = dn_comp(buf2, cp, buflen, NULL, NULL);
323 n = getnum_str(&startp, endp);
327 ShrinkBuffer(INT16SZ);
328 for (i = 0; i < 2; i++) {
329 if (!getword_str(buf2, sizeof buf2, &startp,
332 n = dn_comp(buf2, cp, buflen, dnptrs,
342 unsigned int maxbm = 0;
344 if (!getword_str(buf2, sizeof buf2, &startp, endp))
346 if (!inet_aton(buf2, &ina))
348 n1 = ntohl(ina.s_addr);
349 ShrinkBuffer(INT32SZ);
352 if (!getword_str(buf2, sizeof buf2, &startp, endp))
354 if ((i = res_protocolnumber(buf2)) < 0)
359 for (i = 0; i < MAXPORT/8 ; i++)
362 while (getword_str(buf2, sizeof buf2, &startp, endp)) {
363 if ((n = res_servicenumber(buf2)) <= 0)
367 bm[n/8] |= (0x80>>(n%8));
368 if ((unsigned)n > maxbm)
375 memcpy(cp, bm, maxbm);
380 for (i = 0; i < 2; i++) {
381 if ((n = getstr_str(buf2, sizeof buf2,
394 if ((n = getstr_str(buf2, sizeof buf2,
395 &startp, endp)) < 0) {
396 if (cp != (sp2 + INT16SZ))
410 if ((n = getstr_str(buf2, sizeof buf2, &startp,
422 if ((n = getstr_str(buf2, sizeof buf2, &startp,
425 if ((n > 255) || (n == 0))
431 if ((n = getstr_str(buf2, sizeof buf2, &startp,
442 if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
451 if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
463 int sig_type, success, dateerror;
464 u_int32_t exptime, timesigned;
467 if ((n = getword_str(buf2, sizeof buf2,
470 sig_type = sym_ston(__p_type_syms, buf2, &success);
471 if (!success || sig_type == ns_t_any)
473 ShrinkBuffer(INT16SZ);
474 PUTSHORT(sig_type, cp);
476 n = getnum_str(&startp, endp);
482 n = getnum_str(&startp, endp);
483 if (n <= 0 || n > 255)
488 if (!getword_str(buf2, sizeof buf2, &startp, endp))
490 exptime = ns_datetosecs(buf2, &dateerror);
492 ShrinkBuffer(INT32SZ);
500 ottl = strtoul(buf2, &ulendp, 10);
502 (ulendp != NULL && *ulendp != '\0'))
504 ShrinkBuffer(INT32SZ);
506 if (!getword_str(buf2, sizeof buf2, &startp,
509 exptime = ns_datetosecs(buf2, &dateerror);
514 ShrinkBuffer(INT32SZ);
515 PUTLONG(exptime, cp);
517 if (!getword_str(buf2, sizeof buf2, &startp, endp))
519 timesigned = ns_datetosecs(buf2, &dateerror);
521 ShrinkBuffer(INT32SZ);
522 PUTLONG(timesigned, cp);
527 n = getnum_str(&startp, endp);
530 ShrinkBuffer(INT16SZ);
533 if (!getword_str(buf2, sizeof buf2, &startp, endp))
535 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
541 if ((n = getword_str(buf2, sizeof buf2,
544 siglen = b64_pton(buf2, buf3, sizeof(buf3));
547 ShrinkBuffer(siglen);
548 memcpy(cp, buf3, siglen);
555 n = gethexnum_str(&startp, endp);
558 ShrinkBuffer(INT16SZ);
561 n = getnum_str(&startp, endp);
567 n = getnum_str(&startp, endp);
573 if ((n = getword_str(buf2, sizeof buf2,
576 keylen = b64_pton(buf2, buf3, sizeof(buf3));
579 ShrinkBuffer(keylen);
580 memcpy(cp, buf3, keylen);
585 int success, nxt_type;
590 if (!getword_str(buf2, sizeof buf2, &startp, endp))
592 n = dn_comp(buf2, cp, buflen, NULL, NULL);
598 memset(data, 0, sizeof data);
600 if (!getword_str(buf2, sizeof buf2, &startp,
603 nxt_type = sym_ston(__p_type_syms, buf2,
605 if (!success || !ns_t_rr_p(nxt_type))
607 NS_NXT_BIT_SET(nxt_type, data);
608 if (nxt_type > maxtype)
611 n = maxtype/NS_NXT_BITS+1;
619 n = getnum_str(&startp, endp);
622 ShrinkBuffer(INT16SZ);
625 n = getnum_str(&startp, endp);
628 ShrinkBuffer(INT16SZ);
631 n = getnum_str(&startp, endp);
637 if ((n = getword_str(buf2, sizeof buf2,
640 certlen = b64_pton(buf2, buf3, sizeof(buf3));
643 ShrinkBuffer(certlen);
644 memcpy(cp, buf3, certlen);
648 if (!getword_str(buf2, sizeof buf2, &startp, endp))
650 if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
652 ShrinkBuffer(NS_IN6ADDRSZ);
653 memcpy(cp, &in6a, NS_IN6ADDRSZ);
657 /* Order Preference Flags Service Replacement Regexp */
659 n = getnum_str(&startp, endp);
660 if (n < 0 || n > 65535)
662 ShrinkBuffer(INT16SZ);
665 n = getnum_str(&startp, endp);
666 if (n < 0 || n > 65535)
668 ShrinkBuffer(INT16SZ);
671 if ((n = getstr_str(buf2, sizeof buf2,
672 &startp, endp)) < 0) {
681 /* Service Classes */
682 if ((n = getstr_str(buf2, sizeof buf2,
683 &startp, endp)) < 0) {
693 if ((n = getstr_str(buf2, sizeof buf2,
694 &startp, endp)) < 0) {
704 if (!getword_str(buf2, sizeof buf2, &startp, endp))
706 n = dn_comp(buf2, cp, buflen, NULL, NULL);
715 n = (u_int16_t)((cp - sp2) - INT16SZ);
719 hp->qdcount = htons(counts[0]);
720 hp->ancount = htons(counts[1]);
721 hp->nscount = htons(counts[2]);
722 hp->arcount = htons(counts[3]);
727 * Get a whitespace delimited word from a string (not file)
728 * into buf. modify the start pointer to point after the
729 * word in the string.
732 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
736 for (cp = buf; *startpp <= endp; ) {
738 if (isspace(c) || c == '\0') {
739 if (cp != buf) /* trailing whitespace */
741 else { /* leading whitespace */
747 if (cp >= buf+size-1)
756 * get a white spae delimited string from memory. Process quoted strings
757 * and \DDD escapes. Return length or -1 on error. Returned string may
760 static char digits[] = "0123456789";
762 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
770 for (cp = buf; *startpp <= endp; ) {
771 if ((c = **startpp) == '\0')
773 /* leading white space */
774 if ((cp == buf) && !seen_quote && isspace(c)) {
812 (strchr(digits, c) - digits);
822 } else if (!inquote && isspace(c))
824 if (cp >= buf+size-1)
832 return ((cp == buf)? (seen_quote? 0: -1): (cp - buf));
835 * Get a whitespace delimited base 16 number from a string (not file) into buf
836 * update the start pointer to point after the number in the string.
839 gethexnum_str(u_char **startpp, u_char *endp) {
844 if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
845 return getnum_str(startpp, endp);
847 for (n = 0; *startpp <= endp; ) {
849 if (isspace(c) || c == '\0') {
850 if (seendigit) /* trailing whitespace */
852 else { /* leading whitespace */
858 while ((*startpp <= endp) &&
859 ((c = **startpp) != '\n'))
866 if (c == ')' && seendigit) {
874 n = n * 16 + (c - '0');
876 n = n * 16 + (tolower(c) - 'a' + 10);
883 * Get a whitespace delimited base 10 number from a string (not file) into buf
884 * update the start pointer to point after the number in the string.
887 getnum_str(u_char **startpp, u_char *endp) {
892 for (n = 0; *startpp <= endp; ) {
894 if (isspace(c) || c == '\0') {
895 if (seendigit) /* trailing whitespace */
897 else { /* leading whitespace */
903 while ((*startpp <= endp) &&
904 ((c = **startpp) != '\n'))
911 if (c == ')' && seendigit) {
918 n = n * 10 + (c - '0');
925 * Allocate a resource record buffer & save rr info.
928 res_mkupdrec(int section, const char *dname,
929 u_int class, u_int type, u_long ttl) {
930 ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
932 if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
937 INIT_LINK(rrecp, r_link);
938 INIT_LINK(rrecp, r_glink);
939 rrecp->r_class = (ns_class)class;
940 rrecp->r_type = (ns_type)type;
942 rrecp->r_section = (ns_sect)section;
947 * Free a resource record buffer created by res_mkupdrec.
950 res_freeupdrec(ns_updrec *rrecp) {
951 /* Note: freeing r_dp is the caller's responsibility. */
952 if (rrecp->r_dname != NULL)
953 free(rrecp->r_dname);
958 struct valuelist * next;
959 struct valuelist * prev;
964 static struct valuelist *servicelist, *protolist;
967 res_buildservicelist() {
969 struct valuelist *slp;
976 while ((sp = getservent()) != NULL) {
977 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
980 slp->name = strdup(sp->s_name);
981 slp->proto = strdup(sp->s_proto);
982 if ((slp->name == NULL) || (slp->proto == NULL)) {
983 if (slp->name) free(slp->name);
984 if (slp->proto) free(slp->proto);
988 slp->port = ntohs((u_int16_t)sp->s_port); /* host byt order */
989 slp->next = servicelist;
992 servicelist->prev = slp;
1000 res_destroyservicelist() {
1001 struct valuelist *slp, *slp_next;
1003 for (slp = servicelist; slp != NULL; slp = slp_next) {
1004 slp_next = slp->next;
1009 servicelist = (struct valuelist *)0;
1014 res_buildprotolist(void) {
1015 struct protoent *pp;
1016 struct valuelist *slp;
1023 while ((pp = getprotoent()) != NULL) {
1024 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1027 slp->name = strdup(pp->p_name);
1028 if (slp->name == NULL) {
1032 slp->port = pp->p_proto; /* host byte order */
1033 slp->next = protolist;
1036 protolist->prev = slp;
1044 res_destroyprotolist(void) {
1045 struct valuelist *plp, *plp_next;
1047 for (plp = protolist; plp != NULL; plp = plp_next) {
1048 plp_next = plp->next;
1052 protolist = (struct valuelist *)0;
1057 findservice(const char *s, struct valuelist **list) {
1058 struct valuelist *lp = *list;
1061 for (; lp != NULL; lp = lp->next)
1062 if (strcasecmp(lp->name, s) == 0) {
1064 lp->prev->next = lp->next;
1066 lp->next->prev = lp->prev;
1071 return (lp->port); /* host byte order */
1073 if (sscanf(s, "%d", &n) != 1 || n <= 0)
1079 * Convert service name or (ascii) number to int.
1085 res_servicenumber(const char *p) {
1086 if (servicelist == (struct valuelist *)0)
1087 res_buildservicelist();
1088 return (findservice(p, &servicelist));
1092 * Convert protocol name or (ascii) number to int.
1098 res_protocolnumber(const char *p) {
1099 if (protolist == (struct valuelist *)0)
1100 res_buildprotolist();
1101 return (findservice(p, &protolist));
1105 static struct servent *
1106 cgetservbyport(u_int16_t port, const char *proto) { /* Host byte order. */
1107 struct valuelist **list = &servicelist;
1108 struct valuelist *lp = *list;
1109 static struct servent serv;
1112 for (; lp != NULL; lp = lp->next) {
1113 if (port != (u_int16_t)lp->port) /* Host byte order. */
1115 if (strcasecmp(lp->proto, proto) == 0) {
1117 lp->prev->next = lp->next;
1119 lp->next->prev = lp->prev;
1124 serv.s_name = lp->name;
1125 serv.s_port = htons((u_int16_t)lp->port);
1126 serv.s_proto = lp->proto;
1133 static struct protoent *
1134 cgetprotobynumber(int proto) { /* Host byte order. */
1135 struct valuelist **list = &protolist;
1136 struct valuelist *lp = *list;
1137 static struct protoent prot;
1139 for (; lp != NULL; lp = lp->next)
1140 if (lp->port == proto) { /* Host byte order. */
1142 lp->prev->next = lp->next;
1144 lp->next->prev = lp->prev;
1149 prot.p_name = lp->name;
1150 prot.p_proto = lp->port; /* Host byte order. */
1157 res_protocolname(int num) {
1158 static char number[8];
1159 struct protoent *pp;
1161 if (protolist == (struct valuelist *)0)
1162 res_buildprotolist();
1163 pp = cgetprotobynumber(num);
1165 (void) sprintf(number, "%d", num);
1168 return (pp->p_name);
1172 res_servicename(u_int16_t port, const char *proto) { /* Host byte order. */
1173 static char number[8];
1176 if (servicelist == (struct valuelist *)0)
1177 res_buildservicelist();
1178 ss = cgetservbyport(htons(port), proto);
1180 (void) sprintf(number, "%d", port);
1183 return (ss->s_name);