yp_dnslookup.c revision 146446
1203790Sfabient/* 2233611Sfabient * Copyright (c) 1995, 1996 3203790Sfabient * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 4203790Sfabient * 5203790Sfabient * Redistribution and use in source and binary forms, with or without 6203790Sfabient * modification, are permitted provided that the following conditions 7203790Sfabient * are met: 8203790Sfabient * 1. Redistributions of source code must retain the above copyright 9203790Sfabient * notice, this list of conditions and the following disclaimer. 10203790Sfabient * 2. Redistributions in binary form must reproduce the above copyright 11203790Sfabient * notice, this list of conditions and the following disclaimer in the 12203790Sfabient * documentation and/or other materials provided with the distribution. 13203790Sfabient * 3. All advertising materials mentioning features or use of this software 14203790Sfabient * must display the following acknowledgement: 15203790Sfabient * This product includes software developed by Bill Paul. 16203790Sfabient * 4. Neither the name of the University nor the names of its contributors 17203790Sfabient * may be used to endorse or promote products derived from this software 18203790Sfabient * without specific prior written permission. 19203790Sfabient * 20203790Sfabient * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21203790Sfabient * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22203790Sfabient * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23203790Sfabient * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 24203790Sfabient * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25203790Sfabient * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26203790Sfabient * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27203790Sfabient * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28203790Sfabient * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29203790Sfabient * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30203790Sfabient * SUCH DAMAGE. 31203790Sfabient */ 32203790Sfabient 33203790Sfabient#include <sys/cdefs.h> 34203790Sfabient__FBSDID("$FreeBSD: head/usr.sbin/ypserv/yp_dnslookup.c 146446 2005-05-20 13:04:10Z charnier $"); 35203790Sfabient 36203790Sfabient/* 37203790Sfabient * Do standard and reverse DNS lookups using the resolver library. 38203790Sfabient * Take care of all the dirty work here so the main program only has to 39203790Sfabient * pass us a pointer to an array of characters. 40203790Sfabient * 41203790Sfabient * We have to use direct resolver calls here otherwise the YP server 42203790Sfabient * could end up looping by calling itself over and over again until 43203790Sfabient * it disappeared up its own belly button. 44203790Sfabient */ 45203790Sfabient 46203790Sfabient#include <sys/param.h> 47203790Sfabient#include <sys/socket.h> 48203790Sfabient#include <sys/time.h> 49203790Sfabient#include <sys/fcntl.h> 50203790Sfabient#include <sys/queue.h> 51203790Sfabient#include <netinet/in.h> 52203790Sfabient#include <arpa/inet.h> 53203790Sfabient#include <arpa/nameser.h> 54203790Sfabient 55203790Sfabient#include <ctype.h> 56203790Sfabient#include <errno.h> 57203790Sfabient#include <netdb.h> 58203790Sfabient#include <stdio.h> 59203790Sfabient#include <stdlib.h> 60203790Sfabient#include <string.h> 61233611Sfabient#include <resolv.h> 62203790Sfabient#include <unistd.h> 63203790Sfabient 64203790Sfabient#include <rpcsvc/yp.h> 65203790Sfabient#include "yp_extern.h" 66203790Sfabient 67203790Sfabientstatic char * 68233611Sfabientparse(struct hostent *hp) 69203790Sfabient{ 70203790Sfabient static char result[MAXHOSTNAMELEN * 2]; 71203790Sfabient int i; 72233611Sfabient size_t len; 73203790Sfabient char addr[46]; 74203790Sfabient 75203790Sfabient if (hp == NULL) 76203790Sfabient return(NULL); 77203790Sfabient 78203790Sfabient if (inet_ntop(hp->h_addrtype, hp->h_addr, addr, sizeof(addr)) == NULL) 79203790Sfabient return(NULL); 80203790Sfabient 81203790Sfabient len = strlen(addr) + 1 + strlen(hp->h_name); 82203790Sfabient for (i = 0; hp->h_aliases[i]; i++) 83203790Sfabient len += strlen(hp->h_aliases[i]) + 1; 84203790Sfabient len++; 85203790Sfabient 86203790Sfabient if (len > sizeof(result)) 87203790Sfabient return(NULL); 88203790Sfabient 89203790Sfabient bzero(result, sizeof(result)); 90203790Sfabient snprintf(result, sizeof(result), "%s %s", addr, hp->h_name); 91203790Sfabient for (i = 0; hp->h_aliases[i]; i++) { 92203790Sfabient strcat(result, " "); 93203790Sfabient strcat(result, hp->h_aliases[i]); 94203790Sfabient } 95203790Sfabient 96203790Sfabient return ((char *)&result); 97203790Sfabient} 98233611Sfabient 99233611Sfabient#define MAXPACKET (64*1024) 100233611Sfabient#define DEF_TTL 50 101233611Sfabient 102233611Sfabient#define BY_DNS_ID 1 103203790Sfabient#define BY_RPC_XID 2 104203790Sfabient 105203790Sfabientextern struct hostent *__dns_getanswer(char *, int, char *, int); 106203790Sfabient 107203790Sfabientstatic TAILQ_HEAD(dns_qhead, circleq_dnsentry) qhead; 108203790Sfabient 109203790Sfabientstruct circleq_dnsentry { 110203790Sfabient SVCXPRT *xprt; 111203790Sfabient unsigned long xid; 112203790Sfabient struct sockaddr_in client_addr; 113233611Sfabient unsigned long ypvers; 114233611Sfabient unsigned long id; 115233611Sfabient unsigned long ttl; 116233611Sfabient unsigned long type; 117233611Sfabient unsigned short prot_type; 118233611Sfabient char **domain; 119233611Sfabient char *name; 120233611Sfabient int addrtype; 121203790Sfabient int addrlen; 122203790Sfabient uint32_t addr[4]; /* IPv4 or IPv6 */ 123203790Sfabient TAILQ_ENTRY(circleq_dnsentry) links; 124203790Sfabient}; 125233611Sfabient 126203790Sfabientstatic int pending = 0; 127203790Sfabient 128241737Sedint 129203790Sfabientyp_init_resolver(void) 130233611Sfabient{ 131233611Sfabient TAILQ_INIT(&qhead); 132203790Sfabient if (!(_res.options & RES_INIT) && res_init() == -1) { 133207755Sfabient yp_error("res_init failed"); 134207755Sfabient return(1); 135207755Sfabient } 136207755Sfabient if ((resfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { 137207755Sfabient yp_error("couldn't create socket"); 138241737Sed return(1); 139241737Sed } 140233611Sfabient if (fcntl(resfd, F_SETFL, O_NONBLOCK) == -1) { 141207755Sfabient yp_error("couldn't make resolver socket non-blocking"); 142203790Sfabient return(1); 143203790Sfabient } 144203790Sfabient return(0); 145233611Sfabient} 146203790Sfabient 147203790Sfabientstatic struct 148203790Sfabientcircleq_dnsentry *yp_malloc_dnsent(void) 149203790Sfabient{ 150203790Sfabient register struct circleq_dnsentry *q; 151203790Sfabient 152203790Sfabient q = (struct circleq_dnsentry *)malloc(sizeof(struct circleq_dnsentry)); 153203790Sfabient 154203790Sfabient if (q == NULL) { 155203790Sfabient yp_error("failed to malloc() circleq dns entry"); 156203790Sfabient return(NULL); 157203790Sfabient } 158203790Sfabient 159203790Sfabient return(q); 160203790Sfabient} 161203790Sfabient 162203790Sfabient/* 163203790Sfabient * Transmit a query. 164203790Sfabient */ 165203790Sfabientstatic unsigned long 166203790Sfabientyp_send_dns_query(char *name, int type) 167203790Sfabient{ 168203790Sfabient char buf[MAXPACKET]; 169203790Sfabient int n; 170203790Sfabient HEADER *hptr; 171203790Sfabient int ns; 172203790Sfabient int rval; 173203790Sfabient unsigned long id; 174203790Sfabient 175203790Sfabient bzero(buf, sizeof(buf)); 176203790Sfabient 177203790Sfabient n = res_mkquery(QUERY,name,C_IN,type,NULL,0,NULL,buf,sizeof(buf)); 178203790Sfabient 179203790Sfabient if (n <= 0) { 180203790Sfabient yp_error("res_mkquery failed for %s type %d", name, type); 181203790Sfabient return(0); 182203790Sfabient } 183203790Sfabient 184203790Sfabient hptr = (HEADER *)&buf; 185203790Sfabient id = ntohs(hptr->id); 186203790Sfabient 187203790Sfabient for (ns = 0; ns < _res.nscount; ns++) { 188203790Sfabient rval = sendto(resfd, buf, n, 0, 189203790Sfabient (struct sockaddr *)&_res.nsaddr_list[ns], 190203790Sfabient sizeof(struct sockaddr)); 191203790Sfabient if (rval == -1) { 192203790Sfabient yp_error("sendto failed"); 193203790Sfabient return(0); 194203790Sfabient } 195203790Sfabient } 196203790Sfabient 197203790Sfabient return(id); 198203790Sfabient} 199203790Sfabient 200203790Sfabientstatic struct circleq_dnsentry * 201203790Sfabientyp_find_dnsqent(unsigned long id, int type) 202203790Sfabient{ 203203790Sfabient register struct circleq_dnsentry *q; 204203790Sfabient 205203790Sfabient TAILQ_FOREACH(q, &qhead, links) { 206203790Sfabient switch (type) { 207203790Sfabient case BY_RPC_XID: 208203790Sfabient if (id == q->xid) 209203790Sfabient return(q); 210203790Sfabient break; 211203790Sfabient case BY_DNS_ID: 212203790Sfabient default: 213203790Sfabient if (id == q->id) 214203790Sfabient return(q); 215203790Sfabient break; 216203790Sfabient } 217203790Sfabient } 218203790Sfabient return (NULL); 219203790Sfabient} 220203790Sfabient 221203790Sfabientstatic void 222203790Sfabientyp_send_dns_reply(struct circleq_dnsentry *q, char *buf) 223203790Sfabient{ 224203790Sfabient ypresponse result_v1; 225203790Sfabient ypresp_val result_v2; 226203790Sfabient unsigned long xid; 227203790Sfabient struct sockaddr_in client_addr; 228203790Sfabient xdrproc_t xdrfunc; 229203790Sfabient char *result; 230203790Sfabient 231203790Sfabient /* 232203790Sfabient * Set up correct reply struct and 233203790Sfabient * XDR filter depending on ypvers. 234203790Sfabient */ 235203790Sfabient switch (q->ypvers) { 236203790Sfabient case YPVERS: 237203790Sfabient bzero((char *)&result_v2, sizeof(result_v2)); 238203790Sfabient 239203790Sfabient if (buf == NULL) 240203790Sfabient result_v2.stat = YP_NOKEY; 241203790Sfabient else { 242203790Sfabient result_v2.val.valdat_len = strlen(buf); 243203790Sfabient result_v2.val.valdat_val = buf; 244203790Sfabient result_v2.stat = YP_TRUE; 245203790Sfabient } 246203790Sfabient result = (char *)&result_v2; 247203790Sfabient xdrfunc = (xdrproc_t)xdr_ypresp_val; 248203790Sfabient break; 249203790Sfabient case YPOLDVERS: 250203790Sfabient /* 251203790Sfabient * The odds are we will _never_ execute this 252203790Sfabient * particular code, but we include it anyway 253203790Sfabient * for the sake of completeness. 254203790Sfabient */ 255203790Sfabient bzero((char *)&result_v1, sizeof(result_v1)); 256203790Sfabient result_v1.yp_resptype = YPRESP_VAL; 257203790Sfabient 258203790Sfabient#define YPVAL ypresponse_u.yp_resp_valtype 259203790Sfabient if (buf == NULL) 260203790Sfabient result_v1.YPVAL.stat = YP_NOKEY; 261203790Sfabient else { 262203790Sfabient result_v1.YPVAL.val.valdat_len = strlen(buf); 263203790Sfabient result_v1.YPVAL.val.valdat_val = buf; 264203790Sfabient result_v1.YPVAL.stat = YP_TRUE; 265203790Sfabient } 266203790Sfabient result = (char *)&result_v1; 267203790Sfabient xdrfunc = (xdrproc_t)xdr_ypresponse; 268203790Sfabient break; 269233611Sfabient default: 270233611Sfabient yp_error("bad YP program version (%lu)!", q->ypvers); 271203790Sfabient return; 272203790Sfabient break; 273203790Sfabient } 274203790Sfabient 275203790Sfabient if (debug) 276203790Sfabient yp_error("sending dns reply to %s (%lu)", 277203790Sfabient inet_ntoa(q->client_addr.sin_addr), q->id); 278203790Sfabient /* 279233611Sfabient * XXX This is disgusting. There's basically one transport 280203790Sfabient * handle for UDP, but we're holding off on replying to a 281203790Sfabient * client until we're ready, by which time we may have received 282203790Sfabient * several other queries from other clients with different 283203790Sfabient * transaction IDs. So to make the delayed response thing work, 284203790Sfabient * we have to save the transaction ID and client address of 285203790Sfabient * each request, then jam them into the transport handle when 286203790Sfabient * we're ready to send a reply. Then after we've send the reply, 287203790Sfabient * we put the old transaction ID and remote address back the 288203790Sfabient * way we found 'em. This is _INCREDIBLY_ non-portable; it's 289233611Sfabient * not even supported by the RPC library. 290203790Sfabient */ 291203790Sfabient /* 292203790Sfabient * XXX Don't frob the transaction ID for TCP handles. 293203790Sfabient */ 294203790Sfabient if (q->prot_type == SOCK_DGRAM) 295203790Sfabient xid = svcudp_set_xid(q->xprt, q->xid); 296203790Sfabient client_addr = q->xprt->xp_raddr; 297203790Sfabient q->xprt->xp_raddr = q->client_addr; 298233611Sfabient 299203790Sfabient if (!svc_sendreply(q->xprt, xdrfunc, result)) 300203790Sfabient yp_error("svc_sendreply failed"); 301203790Sfabient 302203790Sfabient /* 303203790Sfabient * Now that we sent the reply, 304203790Sfabient * put the handle back the way it was. 305203790Sfabient */ 306203790Sfabient if (q->prot_type == SOCK_DGRAM) 307233611Sfabient svcudp_set_xid(q->xprt, xid); 308233611Sfabient q->xprt->xp_raddr = client_addr; 309233611Sfabient 310233611Sfabient return; 311203790Sfabient} 312203790Sfabient 313203790Sfabient/* 314203790Sfabient * Decrement TTL on all queue entries, possibly nuking 315203790Sfabient * any that have been around too long without being serviced. 316203790Sfabient */ 317203790Sfabientvoid 318203790Sfabientyp_prune_dnsq(void) 319233611Sfabient{ 320233611Sfabient register struct circleq_dnsentry *q, *n; 321203790Sfabient 322203790Sfabient q = TAILQ_FIRST(&qhead); 323203790Sfabient while (q != NULL) { 324203790Sfabient q->ttl--; 325203790Sfabient n = TAILQ_NEXT(q, links); 326203790Sfabient if (!q->ttl) { 327203790Sfabient TAILQ_REMOVE(&qhead, q, links); 328203790Sfabient free(q->name); 329203790Sfabient free(q); 330203790Sfabient pending--; 331203790Sfabient } 332203790Sfabient q = n; 333203790Sfabient } 334203790Sfabient 335203790Sfabient if (pending < 0) 336203790Sfabient pending = 0; 337203790Sfabient 338203790Sfabient return; 339203790Sfabient} 340203790Sfabient 341203790Sfabient/* 342203790Sfabient * Data is pending on the DNS socket; check for valid replies 343203790Sfabient * to our queries and dispatch them to waiting clients. 344203790Sfabient */ 345203790Sfabientvoid 346203790Sfabientyp_run_dnsq(void) 347203790Sfabient{ 348203790Sfabient register struct circleq_dnsentry *q; 349203790Sfabient char buf[sizeof(HEADER) + MAXPACKET]; 350203790Sfabient struct sockaddr_in sin; 351203790Sfabient socklen_t len; 352203790Sfabient int rval; 353203790Sfabient HEADER *hptr; 354233611Sfabient struct hostent *hent; 355233611Sfabient 356203790Sfabient if (debug) 357233611Sfabient yp_error("running dns queue"); 358203790Sfabient 359203790Sfabient bzero(buf, sizeof(buf)); 360203790Sfabient 361203790Sfabient len = sizeof(struct sockaddr_in); 362203790Sfabient rval = recvfrom(resfd, buf, sizeof(buf), 0, 363203790Sfabient (struct sockaddr *)&sin, &len); 364203790Sfabient 365203790Sfabient if (rval == -1) { 366207755Sfabient yp_error("recvfrom failed: %s", strerror(errno)); 367203790Sfabient return; 368207755Sfabient } 369210766Sfabient 370203790Sfabient /* 371233611Sfabient * We may have data left in the socket that represents 372203790Sfabient * replies to earlier queries that we don't care about 373203790Sfabient * anymore. If there are no lookups pending or the packet 374203790Sfabient * ID doesn't match any of the queue IDs, just drop it 375203790Sfabient * on the floor. 376203790Sfabient */ 377203790Sfabient hptr = (HEADER *)&buf; 378203790Sfabient if (!pending || 379203790Sfabient (q = yp_find_dnsqent(ntohs(hptr->id), BY_DNS_ID)) == NULL) { 380203790Sfabient /* ignore */ 381207755Sfabient return; 382207755Sfabient } 383207755Sfabient 384203790Sfabient if (debug) 385207755Sfabient yp_error("got dns reply from %s", inet_ntoa(sin.sin_addr)); 386210766Sfabient 387210766Sfabient hent = __dns_getanswer(buf, rval, q->name, q->type); 388233611Sfabient 389233611Sfabient if (hent != NULL) { 390210766Sfabient if (q->type == T_PTR) { 391210766Sfabient hent->h_addr = (char *)q->addr; 392233611Sfabient hent->h_addrtype = q->addrtype; 393207755Sfabient hent->h_length = q->addrlen; 394207755Sfabient } 395207755Sfabient } 396210766Sfabient 397207755Sfabient /* Got an answer ready for a client -- send it off. */ 398207755Sfabient yp_send_dns_reply(q, parse(hent)); 399203790Sfabient pending--; 400207755Sfabient TAILQ_REMOVE(&qhead, q, links); 401203790Sfabient free(q->name); 402203790Sfabient free(q); 403203790Sfabient 404203790Sfabient /* Decrement TTLs on other entries while we're here. */ 405203790Sfabient yp_prune_dnsq(); 406203790Sfabient 407203790Sfabient return; 408203790Sfabient} 409233611Sfabient 410203790Sfabient/* 411206090Sfabient * Queue and transmit an asynchronous DNS hostname lookup. 412206090Sfabient */ 413206090Sfabientypstat 414203790Sfabientyp_async_lookup_name(struct svc_req *rqstp, char *name, int af) 415203790Sfabient{ 416203790Sfabient register struct circleq_dnsentry *q; 417203790Sfabient socklen_t len; 418233611Sfabient int type; 419233611Sfabient 420203790Sfabient /* Check for SOCK_DGRAM or SOCK_STREAM -- we need to know later */ 421233611Sfabient type = -1; 422203790Sfabient len = sizeof(type); 423203790Sfabient if (getsockopt(rqstp->rq_xprt->xp_fd, SOL_SOCKET, 424233611Sfabient SO_TYPE, &type, &len) == -1) { 425203790Sfabient yp_error("getsockopt failed: %s", strerror(errno)); 426203790Sfabient return(YP_YPERR); 427203790Sfabient } 428203790Sfabient 429203790Sfabient /* Avoid transmitting dupe requests. */ 430207755Sfabient if (type == SOCK_DGRAM && 431207755Sfabient yp_find_dnsqent(svcudp_get_xid(rqstp->rq_xprt),BY_RPC_XID) != NULL) 432207755Sfabient return(YP_TRUE); 433207755Sfabient 434207755Sfabient if ((q = yp_malloc_dnsent()) == NULL) 435207755Sfabient return(YP_YPERR); 436207755Sfabient 437207755Sfabient q->type = (af == AF_INET) ? T_A : T_AAAA; 438207755Sfabient q->ttl = DEF_TTL; 439207755Sfabient q->xprt = rqstp->rq_xprt; 440207755Sfabient q->ypvers = rqstp->rq_vers; 441207755Sfabient q->prot_type = type; 442207755Sfabient if (q->prot_type == SOCK_DGRAM) 443207755Sfabient q->xid = svcudp_get_xid(q->xprt); 444207755Sfabient q->client_addr = q->xprt->xp_raddr; 445207755Sfabient q->domain = _res.dnsrch; 446207755Sfabient q->id = yp_send_dns_query(name, q->type); 447207755Sfabient 448207755Sfabient if (q->id == 0) { 449203790Sfabient yp_error("DNS query failed"); 450203790Sfabient free(q); 451203790Sfabient return(YP_YPERR); 452203790Sfabient } 453203790Sfabient 454203790Sfabient q->name = strdup(name); 455207755Sfabient TAILQ_INSERT_HEAD(&qhead, q, links); 456207755Sfabient pending++; 457207755Sfabient 458207755Sfabient if (debug) 459207755Sfabient yp_error("queueing async DNS name lookup (%d)", q->id); 460203790Sfabient 461203790Sfabient yp_prune_dnsq(); 462203790Sfabient return(YP_TRUE); 463203790Sfabient} 464203790Sfabient 465203790Sfabient/* 466207755Sfabient * Queue and transmit an asynchronous DNS IP address lookup. 467207755Sfabient */ 468207755Sfabientypstat 469207755Sfabientyp_async_lookup_addr(struct svc_req *rqstp, char *addr, int af) 470207755Sfabient{ 471207755Sfabient register struct circleq_dnsentry *q; 472207755Sfabient char buf[MAXHOSTNAMELEN], *qp; 473207755Sfabient uint32_t abuf[4]; /* IPv4 or IPv6 */ 474207755Sfabient u_char *uaddr = (u_char *)abuf; 475207755Sfabient socklen_t len; 476207755Sfabient int type, n; 477207755Sfabient 478207755Sfabient /* Check for SOCK_DGRAM or SOCK_STREAM -- we need to know later */ 479207755Sfabient type = -1; 480207755Sfabient len = sizeof(type); 481207755Sfabient if (getsockopt(rqstp->rq_xprt->xp_fd, SOL_SOCKET, 482207755Sfabient SO_TYPE, &type, &len) == -1) { 483207755Sfabient yp_error("getsockopt failed: %s", strerror(errno)); 484207755Sfabient return(YP_YPERR); 485203790Sfabient } 486207755Sfabient 487207755Sfabient /* Avoid transmitting dupe requests. */ 488207755Sfabient if (type == SOCK_DGRAM && 489203790Sfabient yp_find_dnsqent(svcudp_get_xid(rqstp->rq_xprt),BY_RPC_XID) != NULL) 490207755Sfabient return(YP_TRUE); 491207755Sfabient 492203790Sfabient if ((q = yp_malloc_dnsent()) == NULL) 493207755Sfabient return(YP_YPERR); 494207755Sfabient 495207755Sfabient switch (af) { 496207755Sfabient case AF_INET: 497207755Sfabient if (inet_aton(addr, (struct in_addr *)uaddr) != 1) 498207755Sfabient return(YP_NOKEY); 499207755Sfabient snprintf(buf, sizeof(buf), "%u.%u.%u.%u.in-addr.arpa", 500207755Sfabient (uaddr[3] & 0xff), (uaddr[2] & 0xff), 501203790Sfabient (uaddr[1] & 0xff), (uaddr[0] & 0xff)); 502207755Sfabient len = INADDRSZ; 503207755Sfabient break; 504207755Sfabient case AF_INET6: 505207755Sfabient if (inet_pton(af, addr, uaddr) != 1) 506203790Sfabient return(YP_NOKEY); 507203790Sfabient qp = buf; 508203790Sfabient for (n = IN6ADDRSZ - 1; n >= 0; n--) { 509203790Sfabient qp += (size_t)sprintf(qp, "%x.%x.", uaddr[n] & 0xf, 510203790Sfabient (uaddr[n] >> 4) & 0xf); 511203790Sfabient } 512207755Sfabient strlcat(buf, "ip6.arpa", sizeof(buf)); 513207755Sfabient len = IN6ADDRSZ; 514203790Sfabient break; 515203790Sfabient default: 516203790Sfabient return(YP_YPERR); 517207755Sfabient } 518207755Sfabient 519207755Sfabient if (debug) 520233611Sfabient yp_error("DNS address is: %s", buf); 521203790Sfabient 522233611Sfabient q->type = T_PTR; 523203790Sfabient q->ttl = DEF_TTL; 524203790Sfabient q->xprt = rqstp->rq_xprt; 525203790Sfabient q->ypvers = rqstp->rq_vers; 526203790Sfabient q->domain = NULL; 527203790Sfabient q->prot_type = type; 528207755Sfabient if (q->prot_type == SOCK_DGRAM) 529207755Sfabient q->xid = svcudp_get_xid(q->xprt); 530203790Sfabient q->client_addr = q->xprt->xp_raddr; 531203790Sfabient q->id = yp_send_dns_query(buf, q->type); 532203790Sfabient 533203790Sfabient if (q->id == 0) { 534203790Sfabient yp_error("DNS query failed"); 535207755Sfabient free(q); 536203790Sfabient return(YP_YPERR); 537205693Sfabient } 538205693Sfabient 539205693Sfabient memcpy(q->addr, uaddr, len); 540203790Sfabient q->addrlen = len; 541203790Sfabient q->addrtype = af; 542203790Sfabient q->name = strdup(buf); 543203790Sfabient TAILQ_INSERT_HEAD(&qhead, q, links); 544203790Sfabient pending++; 545203790Sfabient 546203790Sfabient if (debug) 547203790Sfabient yp_error("queueing async DNS address lookup (%d)", q->id); 548203790Sfabient 549203790Sfabient yp_prune_dnsq(); 550203790Sfabient return(YP_TRUE); 551203790Sfabient} 552203790Sfabient