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>
47 #include "port_after.h"
49 /* Options. Leave them on. */
53 static int getnum_str(u_char **, u_char *);
54 static int gethexnum_str(u_char **, u_char *);
55 static int getword_str(char *, int, u_char **, u_char *);
56 static int getstr_str(char *, int, u_char **, u_char *);
58 #define ShrinkBuffer(x) if ((buflen -= x) < 0) return (-2);
62 int res_protocolnumber(const char *);
63 int res_servicenumber(const char *);
66 * Form update packets.
67 * Returns the size of the resulting packet if no error
69 * returns -1 if error in reading a word/number in rdata
70 * portion for update packets
71 * -2 if length of buffer passed is insufficient
72 * -3 if zone section is not the first section in
73 * the linked list, or section order has a problem
74 * -4 on a number overflow
75 * -5 unknown operation or no records
78 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
79 ns_updrec *rrecp_start = rrecp_in;
81 u_char *cp, *sp2, *startp, *endp;
82 int n, i, soanum, multiline;
87 u_char buf3[MAXDNAME];
88 int section, numrrs = 0, counts[ns_s_max];
89 u_int16_t rtype, rclass;
91 u_char *dnptrs[20], **dpp, **lastdnptr;
92 int siglen, keylen, certlen;
95 * Initialize header fields.
97 if ((buf == NULL) || (buflen < HFIXEDSZ))
99 memset(buf, 0, HFIXEDSZ);
101 hp->id = htons(++statp->id);
102 hp->opcode = ns_o_update;
109 lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
111 if (rrecp_start == NULL)
113 else if (rrecp_start->r_section != S_ZONE)
116 memset(counts, 0, sizeof counts);
117 for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
119 section = rrecp->r_section;
120 if (section < 0 || section >= ns_s_max)
123 for (i = section + 1; i < ns_s_max; i++)
126 rtype = rrecp->r_type;
127 rclass = rrecp->r_class;
129 /* overload class and type */
130 if (section == S_PREREQ) {
132 switch (rrecp->r_opcode) {
148 if (rrecp->r_size == 0)
153 "res_mkupdate: incorrect opcode: %d\n",
158 } else if (section == S_UPDATE) {
159 switch (rrecp->r_opcode) {
161 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
167 "res_mkupdate: incorrect opcode: %d\n",
175 * XXX appending default domain to owner name is omitted,
176 * fqdn must be provided
178 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
182 ShrinkBuffer(n + 2*INT16SZ);
184 PUTSHORT(rclass, cp);
185 if (section == S_ZONE) {
186 if (numrrs != 1 || rrecp->r_type != T_SOA)
190 ShrinkBuffer(INT32SZ + INT16SZ);
192 sp2 = cp; /* save pointer to length byte */
194 if (rrecp->r_size == 0) {
195 if (section == S_UPDATE && rclass != C_ANY)
202 startp = rrecp->r_data;
203 endp = startp + rrecp->r_size - 1;
204 /* XXX this should be done centrally. */
205 switch (rrecp->r_type) {
207 if (!getword_str(buf2, sizeof buf2, &startp, endp))
209 if (!inet_aton(buf2, &ina))
211 n1 = ntohl(ina.s_addr);
212 ShrinkBuffer(INT32SZ);
222 if (!getword_str(buf2, sizeof buf2, &startp, endp))
224 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
233 for (i = 0; i < 2; i++) {
234 if (!getword_str(buf2, sizeof buf2, &startp,
237 n = dn_comp(buf2, cp, buflen,
244 if (rrecp->r_type == T_SOA) {
245 ShrinkBuffer(5 * INT32SZ);
246 while (isspace(*startp) || !*startp)
248 if (*startp == '(') {
253 /* serial, refresh, retry, expire, minimum */
254 for (i = 0; i < 5; i++) {
255 soanum = getnum_str(&startp, endp);
261 while (isspace(*startp) || !*startp)
271 n = getnum_str(&startp, endp);
274 ShrinkBuffer(INT16SZ);
276 if (!getword_str(buf2, sizeof buf2, &startp, endp))
278 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
285 n = getnum_str(&startp, endp);
288 ShrinkBuffer(INT16SZ);
291 n = getnum_str(&startp, endp);
294 ShrinkBuffer(INT16SZ);
297 n = getnum_str(&startp, endp);
300 ShrinkBuffer(INT16SZ);
303 if (!getword_str(buf2, sizeof buf2, &startp, endp))
305 n = dn_comp(buf2, cp, buflen, NULL, NULL);
312 n = getnum_str(&startp, endp);
316 ShrinkBuffer(INT16SZ);
317 for (i = 0; i < 2; i++) {
318 if (!getword_str(buf2, sizeof buf2, &startp,
321 n = dn_comp(buf2, cp, buflen, dnptrs,
331 unsigned int maxbm = 0;
333 if (!getword_str(buf2, sizeof buf2, &startp, endp))
335 if (!inet_aton(buf2, &ina))
337 n1 = ntohl(ina.s_addr);
338 ShrinkBuffer(INT32SZ);
341 if (!getword_str(buf2, sizeof buf2, &startp, endp))
343 if ((i = res_protocolnumber(buf2)) < 0)
348 for (i = 0; i < MAXPORT/8 ; i++)
351 while (getword_str(buf2, sizeof buf2, &startp, endp)) {
352 if ((n = res_servicenumber(buf2)) <= 0)
356 bm[n/8] |= (0x80>>(n%8));
357 if ((unsigned)n > maxbm)
364 memcpy(cp, bm, maxbm);
369 for (i = 0; i < 2; i++) {
370 if ((n = getstr_str(buf2, sizeof buf2,
383 if ((n = getstr_str(buf2, sizeof buf2,
384 &startp, endp)) < 0) {
385 if (cp != (sp2 + INT16SZ))
399 if ((n = getstr_str(buf2, sizeof buf2, &startp,
411 if ((n = getstr_str(buf2, sizeof buf2, &startp,
414 if ((n > 255) || (n == 0))
420 if ((n = getstr_str(buf2, sizeof buf2, &startp,
431 if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
440 if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
449 int sig_type, success, dateerror;
450 u_int32_t exptime, timesigned;
453 if ((n = getword_str(buf2, sizeof buf2,
456 sig_type = sym_ston(__p_type_syms, buf2, &success);
457 if (!success || sig_type == ns_t_any)
459 ShrinkBuffer(INT16SZ);
460 PUTSHORT(sig_type, cp);
462 n = getnum_str(&startp, endp);
468 n = getnum_str(&startp, endp);
469 if (n <= 0 || n > 255)
474 if (!getword_str(buf2, sizeof buf2, &startp, endp))
476 exptime = ns_datetosecs(buf2, &dateerror);
478 ShrinkBuffer(INT32SZ);
486 ottl = strtoul(buf2, &ulendp, 10);
488 (ulendp != NULL && *ulendp != '\0'))
490 ShrinkBuffer(INT32SZ);
492 if (!getword_str(buf2, sizeof buf2, &startp,
495 exptime = ns_datetosecs(buf2, &dateerror);
500 ShrinkBuffer(INT32SZ);
501 PUTLONG(exptime, cp);
503 if (!getword_str(buf2, sizeof buf2, &startp, endp))
505 timesigned = ns_datetosecs(buf2, &dateerror);
507 ShrinkBuffer(INT32SZ);
508 PUTLONG(timesigned, cp);
513 n = getnum_str(&startp, endp);
516 ShrinkBuffer(INT16SZ);
519 if (!getword_str(buf2, sizeof buf2, &startp, endp))
521 n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
527 if ((n = getword_str(buf2, sizeof buf2,
530 siglen = b64_pton(buf2, buf3, sizeof(buf3));
533 ShrinkBuffer(siglen);
534 memcpy(cp, buf3, siglen);
540 n = gethexnum_str(&startp, endp);
543 ShrinkBuffer(INT16SZ);
546 n = getnum_str(&startp, endp);
552 n = getnum_str(&startp, endp);
558 if ((n = getword_str(buf2, sizeof buf2,
561 keylen = b64_pton(buf2, buf3, sizeof(buf3));
564 ShrinkBuffer(keylen);
565 memcpy(cp, buf3, keylen);
570 int success, nxt_type;
575 if (!getword_str(buf2, sizeof buf2, &startp, endp))
577 n = dn_comp(buf2, cp, buflen, NULL, NULL);
583 memset(data, 0, sizeof data);
585 if (!getword_str(buf2, sizeof buf2, &startp,
588 nxt_type = sym_ston(__p_type_syms, buf2,
590 if (!success || !ns_t_rr_p(nxt_type))
592 NS_NXT_BIT_SET(nxt_type, data);
593 if (nxt_type > maxtype)
596 n = maxtype/NS_NXT_BITS+1;
604 n = getnum_str(&startp, endp);
607 ShrinkBuffer(INT16SZ);
610 n = getnum_str(&startp, endp);
613 ShrinkBuffer(INT16SZ);
616 n = getnum_str(&startp, endp);
622 if ((n = getword_str(buf2, sizeof buf2,
625 certlen = b64_pton(buf2, buf3, sizeof(buf3));
628 ShrinkBuffer(certlen);
629 memcpy(cp, buf3, certlen);
633 if (!getword_str(buf2, sizeof buf2, &startp, endp))
635 if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
637 ShrinkBuffer(NS_IN6ADDRSZ);
638 memcpy(cp, &in6a, NS_IN6ADDRSZ);
642 /* Order Preference Flags Service Replacement Regexp */
644 n = getnum_str(&startp, endp);
645 if (n < 0 || n > 65535)
647 ShrinkBuffer(INT16SZ);
650 n = getnum_str(&startp, endp);
651 if (n < 0 || n > 65535)
653 ShrinkBuffer(INT16SZ);
656 if ((n = getstr_str(buf2, sizeof buf2,
657 &startp, endp)) < 0) {
666 /* Service Classes */
667 if ((n = getstr_str(buf2, sizeof buf2,
668 &startp, endp)) < 0) {
678 if ((n = getstr_str(buf2, sizeof buf2,
679 &startp, endp)) < 0) {
689 if (!getword_str(buf2, sizeof buf2, &startp, endp))
691 n = dn_comp(buf2, cp, buflen, NULL, NULL);
700 n = (u_int16_t)((cp - sp2) - INT16SZ);
704 hp->qdcount = htons(counts[0]);
705 hp->ancount = htons(counts[1]);
706 hp->nscount = htons(counts[2]);
707 hp->arcount = htons(counts[3]);
712 * Get a whitespace delimited word from a string (not file)
713 * into buf. modify the start pointer to point after the
714 * word in the string.
717 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
721 for (cp = buf; *startpp <= endp; ) {
723 if (isspace(c) || c == '\0') {
724 if (cp != buf) /* trailing whitespace */
726 else { /* leading whitespace */
732 if (cp >= buf+size-1)
741 * get a white spae delimited string from memory. Process quoted strings
742 * and \DDD escapes. Return length or -1 on error. Returned string may
745 static char digits[] = "0123456789";
747 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
755 for (cp = buf; *startpp <= endp; ) {
756 if ((c = **startpp) == '\0')
758 /* leading white space */
759 if ((cp == buf) && !seen_quote && isspace(c)) {
797 (strchr(digits, c) - digits);
807 } else if (!inquote && isspace(c))
809 if (cp >= buf+size-1)
817 return ((cp == buf)? (seen_quote? 0: -1): (cp - buf));
820 * Get a whitespace delimited base 16 number from a string (not file) into buf
821 * update the start pointer to point after the number in the string.
824 gethexnum_str(u_char **startpp, u_char *endp) {
829 if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
830 return getnum_str(startpp, endp);
832 for (n = 0; *startpp <= endp; ) {
834 if (isspace(c) || c == '\0') {
835 if (seendigit) /* trailing whitespace */
837 else { /* leading whitespace */
843 while ((*startpp <= endp) &&
844 ((c = **startpp) != '\n'))
851 if (c == ')' && seendigit) {
859 n = n * 16 + (c - '0');
861 n = n * 16 + (tolower(c) - 'a' + 10);
868 * Get a whitespace delimited base 10 number from a string (not file) into buf
869 * update the start pointer to point after the number in the string.
872 getnum_str(u_char **startpp, u_char *endp) {
877 for (n = 0; *startpp <= endp; ) {
879 if (isspace(c) || c == '\0') {
880 if (seendigit) /* trailing whitespace */
882 else { /* leading whitespace */
888 while ((*startpp <= endp) &&
889 ((c = **startpp) != '\n'))
896 if (c == ')' && seendigit) {
903 n = n * 10 + (c - '0');
910 * Allocate a resource record buffer & save rr info.
913 res_mkupdrec(int section, const char *dname,
914 u_int class, u_int type, u_long ttl) {
915 ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
917 if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
922 INIT_LINK(rrecp, r_link);
923 INIT_LINK(rrecp, r_glink);
924 rrecp->r_class = (ns_class)class;
925 rrecp->r_type = (ns_type)type;
927 rrecp->r_section = (ns_sect)section;
932 * Free a resource record buffer created by res_mkupdrec.
935 res_freeupdrec(ns_updrec *rrecp) {
936 /* Note: freeing r_dp is the caller's responsibility. */
937 if (rrecp->r_dname != NULL)
938 free(rrecp->r_dname);
943 struct valuelist * next;
944 struct valuelist * prev;
949 static struct valuelist *servicelist, *protolist;
952 res_buildservicelist() {
954 struct valuelist *slp;
961 while ((sp = getservent()) != NULL) {
962 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
965 slp->name = strdup(sp->s_name);
966 slp->proto = strdup(sp->s_proto);
967 if ((slp->name == NULL) || (slp->proto == NULL)) {
968 if (slp->name) free(slp->name);
969 if (slp->proto) free(slp->proto);
973 slp->port = ntohs((u_int16_t)sp->s_port); /* host byt order */
974 slp->next = servicelist;
977 servicelist->prev = slp;
984 res_destroyservicelist() {
985 struct valuelist *slp, *slp_next;
987 for (slp = servicelist; slp != NULL; slp = slp_next) {
988 slp_next = slp->next;
993 servicelist = (struct valuelist *)0;
997 res_buildprotolist(void) {
999 struct valuelist *slp;
1006 while ((pp = getprotoent()) != NULL) {
1007 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1010 slp->name = strdup(pp->p_name);
1011 if (slp->name == NULL) {
1015 slp->port = pp->p_proto; /* host byte order */
1016 slp->next = protolist;
1019 protolist->prev = slp;
1026 res_destroyprotolist(void) {
1027 struct valuelist *plp, *plp_next;
1029 for (plp = protolist; plp != NULL; plp = plp_next) {
1030 plp_next = plp->next;
1034 protolist = (struct valuelist *)0;
1038 findservice(const char *s, struct valuelist **list) {
1039 struct valuelist *lp = *list;
1042 for (; lp != NULL; lp = lp->next)
1043 if (strcasecmp(lp->name, s) == 0) {
1045 lp->prev->next = lp->next;
1047 lp->next->prev = lp->prev;
1052 return (lp->port); /* host byte order */
1054 if (sscanf(s, "%d", &n) != 1 || n <= 0)
1060 * Convert service name or (ascii) number to int.
1063 res_servicenumber(const char *p) {
1064 if (servicelist == (struct valuelist *)0)
1065 res_buildservicelist();
1066 return (findservice(p, &servicelist));
1070 * Convert protocol name or (ascii) number to int.
1073 res_protocolnumber(const char *p) {
1074 if (protolist == (struct valuelist *)0)
1075 res_buildprotolist();
1076 return (findservice(p, &protolist));
1079 static struct servent *
1080 cgetservbyport(u_int16_t port, const char *proto) { /* Host byte order. */
1081 struct valuelist **list = &servicelist;
1082 struct valuelist *lp = *list;
1083 static struct servent serv;
1086 for (; lp != NULL; lp = lp->next) {
1087 if (port != (u_int16_t)lp->port) /* Host byte order. */
1089 if (strcasecmp(lp->proto, proto) == 0) {
1091 lp->prev->next = lp->next;
1093 lp->next->prev = lp->prev;
1098 serv.s_name = lp->name;
1099 serv.s_port = htons((u_int16_t)lp->port);
1100 serv.s_proto = lp->proto;
1107 static struct protoent *
1108 cgetprotobynumber(int proto) { /* Host byte order. */
1109 struct valuelist **list = &protolist;
1110 struct valuelist *lp = *list;
1111 static struct protoent prot;
1113 for (; lp != NULL; lp = lp->next)
1114 if (lp->port == proto) { /* Host byte order. */
1116 lp->prev->next = lp->next;
1118 lp->next->prev = lp->prev;
1123 prot.p_name = lp->name;
1124 prot.p_proto = lp->port; /* Host byte order. */
1131 res_protocolname(int num) {
1132 static char number[8];
1133 struct protoent *pp;
1135 if (protolist == (struct valuelist *)0)
1136 res_buildprotolist();
1137 pp = cgetprotobynumber(num);
1139 (void) sprintf(number, "%d", num);
1142 return (pp->p_name);
1146 res_servicename(u_int16_t port, const char *proto) { /* Host byte order. */
1147 static char number[8];
1150 if (servicelist == (struct valuelist *)0)
1151 res_buildservicelist();
1152 ss = cgetservbyport(htons(port), proto);
1154 (void) sprintf(number, "%d", port);
1157 return (ss->s_name);