17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * Copyright (c) 1985, 1988 Regents of the University of California. 37c478bd9Sstevel@tonic-gate * All rights reserved. 47c478bd9Sstevel@tonic-gate * 57c478bd9Sstevel@tonic-gate * Redistribution and use in source and binary forms are permitted 67c478bd9Sstevel@tonic-gate * provided that this notice is preserved and that due credit is given 77c478bd9Sstevel@tonic-gate * to the University of California at Berkeley. The name of the University 87c478bd9Sstevel@tonic-gate * may not be used to endorse or promote products derived from this 97c478bd9Sstevel@tonic-gate * software without specific prior written permission. This software 107c478bd9Sstevel@tonic-gate * is provided ``as is'' without express or implied warranty. 117c478bd9Sstevel@tonic-gate * 127c478bd9Sstevel@tonic-gate */ 137c478bd9Sstevel@tonic-gate 147c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* SunOS 1.11; UCB 6.32 */ 157c478bd9Sstevel@tonic-gate 167c478bd9Sstevel@tonic-gate #include "synonyms.h" 177c478bd9Sstevel@tonic-gate 187c478bd9Sstevel@tonic-gate #include <sys/param.h> 197c478bd9Sstevel@tonic-gate #include <sys/socket.h> 207c478bd9Sstevel@tonic-gate #include <netinet/in.h> 217c478bd9Sstevel@tonic-gate #include <ctype.h> 227c478bd9Sstevel@tonic-gate #include <netdb.h> 237c478bd9Sstevel@tonic-gate #include <stdio.h> 247c478bd9Sstevel@tonic-gate #include <errno.h> 257c478bd9Sstevel@tonic-gate #include <arpa/inet.h> 267c478bd9Sstevel@tonic-gate #include <arpa/nameser.h> 277c478bd9Sstevel@tonic-gate #include <resolv.h> 287c478bd9Sstevel@tonic-gate #include <syslog.h> 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate /* 317c478bd9Sstevel@tonic-gate * When the name service switch calls libresolv, it doesn't want fallback 327c478bd9Sstevel@tonic-gate * to /etc/hosts, so we provide a method to turn it off. 337c478bd9Sstevel@tonic-gate */ 347c478bd9Sstevel@tonic-gate static int no_hosts_fallback = 0; 357c478bd9Sstevel@tonic-gate 367c478bd9Sstevel@tonic-gate void 377c478bd9Sstevel@tonic-gate __res_set_no_hosts_fallback(void) { 387c478bd9Sstevel@tonic-gate no_hosts_fallback = 1; 397c478bd9Sstevel@tonic-gate } 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate static int 427c478bd9Sstevel@tonic-gate __res_no_hosts_fallback(void) { 437c478bd9Sstevel@tonic-gate return(no_hosts_fallback); 447c478bd9Sstevel@tonic-gate } 457c478bd9Sstevel@tonic-gate 467c478bd9Sstevel@tonic-gate static char *h_addr_ptrs[MAXADDRS + 1]; 477c478bd9Sstevel@tonic-gate 487c478bd9Sstevel@tonic-gate static struct hostent host; 497c478bd9Sstevel@tonic-gate static char *host_aliases[MAXALIASES]; 507c478bd9Sstevel@tonic-gate static char hostbuf[BUFSIZ+1]; 517c478bd9Sstevel@tonic-gate static struct in_addr host_addr; 527c478bd9Sstevel@tonic-gate static char HOSTDB[] = "/etc/hosts"; 537c478bd9Sstevel@tonic-gate static FILE *hostf = NULL; 547c478bd9Sstevel@tonic-gate static char hostaddr[MAXADDRS]; 557c478bd9Sstevel@tonic-gate static char *host_addrs[2]; 567c478bd9Sstevel@tonic-gate static int stayopen = 0; 577c478bd9Sstevel@tonic-gate static char *any(); 587c478bd9Sstevel@tonic-gate 597c478bd9Sstevel@tonic-gate #if PACKETSZ > 1024 607c478bd9Sstevel@tonic-gate #define MAXPACKET PACKETSZ 617c478bd9Sstevel@tonic-gate #else 627c478bd9Sstevel@tonic-gate #define MAXPACKET 1024 637c478bd9Sstevel@tonic-gate #endif 647c478bd9Sstevel@tonic-gate 657c478bd9Sstevel@tonic-gate typedef union { 667c478bd9Sstevel@tonic-gate HEADER hdr; 677c478bd9Sstevel@tonic-gate u_char buf[MAXPACKET]; 687c478bd9Sstevel@tonic-gate } querybuf; 697c478bd9Sstevel@tonic-gate 707c478bd9Sstevel@tonic-gate static union { 717c478bd9Sstevel@tonic-gate long al; 727c478bd9Sstevel@tonic-gate char ac; 737c478bd9Sstevel@tonic-gate } align; 747c478bd9Sstevel@tonic-gate 757c478bd9Sstevel@tonic-gate 767c478bd9Sstevel@tonic-gate int h_errno; 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate static struct hostent * 797c478bd9Sstevel@tonic-gate getanswer(answer, anslen, iquery) 807c478bd9Sstevel@tonic-gate querybuf *answer; 817c478bd9Sstevel@tonic-gate int anslen; 827c478bd9Sstevel@tonic-gate int iquery; 837c478bd9Sstevel@tonic-gate { 847c478bd9Sstevel@tonic-gate register HEADER *hp; 857c478bd9Sstevel@tonic-gate register u_char *cp; 867c478bd9Sstevel@tonic-gate register int n; 877c478bd9Sstevel@tonic-gate u_char *eom; 887c478bd9Sstevel@tonic-gate char *bp, **ap; 897c478bd9Sstevel@tonic-gate int type, class, buflen, ancount, qdcount; 907c478bd9Sstevel@tonic-gate int haveanswer, getclass = C_ANY; 917c478bd9Sstevel@tonic-gate char **hap; 927c478bd9Sstevel@tonic-gate 937c478bd9Sstevel@tonic-gate eom = answer->buf + anslen; 947c478bd9Sstevel@tonic-gate /* 957c478bd9Sstevel@tonic-gate * find first satisfactory answer 967c478bd9Sstevel@tonic-gate */ 977c478bd9Sstevel@tonic-gate hp = &answer->hdr; 987c478bd9Sstevel@tonic-gate ancount = ntohs(hp->ancount); 997c478bd9Sstevel@tonic-gate qdcount = ntohs(hp->qdcount); 1007c478bd9Sstevel@tonic-gate bp = hostbuf; 1017c478bd9Sstevel@tonic-gate buflen = sizeof (hostbuf); 1027c478bd9Sstevel@tonic-gate cp = answer->buf + sizeof (HEADER); 1037c478bd9Sstevel@tonic-gate if (qdcount) { 1047c478bd9Sstevel@tonic-gate if (iquery) { 1057c478bd9Sstevel@tonic-gate if ((n = dn_expand((char *)answer->buf, eom, 1067c478bd9Sstevel@tonic-gate cp, bp, buflen)) < 0) { 1077c478bd9Sstevel@tonic-gate h_errno = NO_RECOVERY; 1087c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 1097c478bd9Sstevel@tonic-gate } 1107c478bd9Sstevel@tonic-gate cp += n + QFIXEDSZ; 1117c478bd9Sstevel@tonic-gate host.h_name = bp; 1127c478bd9Sstevel@tonic-gate n = strlen(bp) + 1; 1137c478bd9Sstevel@tonic-gate bp += n; 1147c478bd9Sstevel@tonic-gate buflen -= n; 1157c478bd9Sstevel@tonic-gate } else 1167c478bd9Sstevel@tonic-gate cp += dn_skipname(cp, eom) + QFIXEDSZ; 1177c478bd9Sstevel@tonic-gate while (--qdcount > 0) 1187c478bd9Sstevel@tonic-gate cp += dn_skipname(cp, eom) + QFIXEDSZ; 1197c478bd9Sstevel@tonic-gate } else if (iquery) { 1207c478bd9Sstevel@tonic-gate if (hp->aa) 1217c478bd9Sstevel@tonic-gate h_errno = HOST_NOT_FOUND; 1227c478bd9Sstevel@tonic-gate else 1237c478bd9Sstevel@tonic-gate h_errno = TRY_AGAIN; 1247c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 1257c478bd9Sstevel@tonic-gate } 1267c478bd9Sstevel@tonic-gate ap = host_aliases; 1277c478bd9Sstevel@tonic-gate host.h_aliases = host_aliases; 1287c478bd9Sstevel@tonic-gate hap = h_addr_ptrs; 1297c478bd9Sstevel@tonic-gate #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ 1307c478bd9Sstevel@tonic-gate host.h_addr_list = h_addr_ptrs; 1317c478bd9Sstevel@tonic-gate #endif 1327c478bd9Sstevel@tonic-gate haveanswer = 0; 1337c478bd9Sstevel@tonic-gate while (--ancount >= 0 && cp < eom && haveanswer < MAXADDRS) { 1347c478bd9Sstevel@tonic-gate if ((n = dn_expand((char *)answer->buf, eom, 1357c478bd9Sstevel@tonic-gate cp, bp, buflen)) < 0) 1367c478bd9Sstevel@tonic-gate break; 1377c478bd9Sstevel@tonic-gate cp += n; 1387c478bd9Sstevel@tonic-gate type = _getshort(cp); 1397c478bd9Sstevel@tonic-gate cp += sizeof (u_short); 1407c478bd9Sstevel@tonic-gate class = _getshort(cp); 1417c478bd9Sstevel@tonic-gate cp += sizeof (u_short) + sizeof (u_long); 1427c478bd9Sstevel@tonic-gate n = _getshort(cp); 1437c478bd9Sstevel@tonic-gate cp += sizeof (u_short); 1447c478bd9Sstevel@tonic-gate if (type == T_CNAME) { 1457c478bd9Sstevel@tonic-gate cp += n; 1467c478bd9Sstevel@tonic-gate if (ap >= &host_aliases[MAXALIASES-1]) 1477c478bd9Sstevel@tonic-gate continue; 1487c478bd9Sstevel@tonic-gate *ap++ = bp; 1497c478bd9Sstevel@tonic-gate n = strlen(bp) + 1; 1507c478bd9Sstevel@tonic-gate bp += n; 1517c478bd9Sstevel@tonic-gate buflen -= n; 1527c478bd9Sstevel@tonic-gate continue; 1537c478bd9Sstevel@tonic-gate } 1547c478bd9Sstevel@tonic-gate if (iquery && type == T_PTR) { 1557c478bd9Sstevel@tonic-gate if ((n = dn_expand((char *)answer->buf, eom, 1567c478bd9Sstevel@tonic-gate cp, bp, buflen)) < 0) { 1577c478bd9Sstevel@tonic-gate cp += n; 1587c478bd9Sstevel@tonic-gate continue; 1597c478bd9Sstevel@tonic-gate } 1607c478bd9Sstevel@tonic-gate cp += n; 1617c478bd9Sstevel@tonic-gate host.h_name = bp; 1627c478bd9Sstevel@tonic-gate return (&host); 1637c478bd9Sstevel@tonic-gate } 1647c478bd9Sstevel@tonic-gate if (iquery || type != T_A) { 1657c478bd9Sstevel@tonic-gate #ifdef DEBUG 1667c478bd9Sstevel@tonic-gate if (_res.options & RES_DEBUG) 1677c478bd9Sstevel@tonic-gate printf("unexpected answer type %d, size %d\n", 1687c478bd9Sstevel@tonic-gate type, n); 1697c478bd9Sstevel@tonic-gate #endif 1707c478bd9Sstevel@tonic-gate cp += n; 1717c478bd9Sstevel@tonic-gate continue; 1727c478bd9Sstevel@tonic-gate } 1737c478bd9Sstevel@tonic-gate if (haveanswer) { 1747c478bd9Sstevel@tonic-gate if (n != host.h_length) { 1757c478bd9Sstevel@tonic-gate cp += n; 1767c478bd9Sstevel@tonic-gate continue; 1777c478bd9Sstevel@tonic-gate } 1787c478bd9Sstevel@tonic-gate if (class != getclass) { 1797c478bd9Sstevel@tonic-gate cp += n; 1807c478bd9Sstevel@tonic-gate continue; 1817c478bd9Sstevel@tonic-gate } 1827c478bd9Sstevel@tonic-gate } else { 1837c478bd9Sstevel@tonic-gate host.h_length = n; 1847c478bd9Sstevel@tonic-gate getclass = class; 1857c478bd9Sstevel@tonic-gate host.h_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC; 1867c478bd9Sstevel@tonic-gate if (!iquery) { 1877c478bd9Sstevel@tonic-gate host.h_name = bp; 1887c478bd9Sstevel@tonic-gate bp += strlen(bp) + 1; 1897c478bd9Sstevel@tonic-gate } 1907c478bd9Sstevel@tonic-gate } 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate bp += sizeof (align) - ((u_long)bp % sizeof (align)); 1937c478bd9Sstevel@tonic-gate 1947c478bd9Sstevel@tonic-gate if (bp + n >= &hostbuf[sizeof (hostbuf)]) { 1957c478bd9Sstevel@tonic-gate #ifdef DEBUG 1967c478bd9Sstevel@tonic-gate if (_res.options & RES_DEBUG) 1977c478bd9Sstevel@tonic-gate printf("size (%d) too big\n", n); 1987c478bd9Sstevel@tonic-gate #endif 1997c478bd9Sstevel@tonic-gate break; 2007c478bd9Sstevel@tonic-gate } 2017c478bd9Sstevel@tonic-gate #ifdef SYSV 2027c478bd9Sstevel@tonic-gate memcpy((void *)(*hap++ = bp), (void *)cp, n); 2037c478bd9Sstevel@tonic-gate #else 2047c478bd9Sstevel@tonic-gate bcopy(cp, *hap++ = bp, n); 2057c478bd9Sstevel@tonic-gate #endif 2067c478bd9Sstevel@tonic-gate bp += n; 2077c478bd9Sstevel@tonic-gate cp += n; 2087c478bd9Sstevel@tonic-gate haveanswer++; 2097c478bd9Sstevel@tonic-gate } 2107c478bd9Sstevel@tonic-gate if (haveanswer) { 2117c478bd9Sstevel@tonic-gate *ap = NULL; 2127c478bd9Sstevel@tonic-gate #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ 2137c478bd9Sstevel@tonic-gate *hap = NULL; 2147c478bd9Sstevel@tonic-gate #else 2157c478bd9Sstevel@tonic-gate host.h_addr = h_addr_ptrs[0]; 2167c478bd9Sstevel@tonic-gate #endif 2177c478bd9Sstevel@tonic-gate return (&host); 2187c478bd9Sstevel@tonic-gate } else { 2197c478bd9Sstevel@tonic-gate h_errno = TRY_AGAIN; 2207c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 2217c478bd9Sstevel@tonic-gate } 2227c478bd9Sstevel@tonic-gate } 2237c478bd9Sstevel@tonic-gate 2247c478bd9Sstevel@tonic-gate struct hostent * 2257c478bd9Sstevel@tonic-gate res_gethostbyname(name) 2267c478bd9Sstevel@tonic-gate char *name; 2277c478bd9Sstevel@tonic-gate { 2287c478bd9Sstevel@tonic-gate querybuf buf; 2297c478bd9Sstevel@tonic-gate register char *cp; 2307c478bd9Sstevel@tonic-gate int n; 2317c478bd9Sstevel@tonic-gate struct hostent *hp, *gethostdomain(); 2327c478bd9Sstevel@tonic-gate static struct hostent *_gethtbyname(); 2337c478bd9Sstevel@tonic-gate 2347c478bd9Sstevel@tonic-gate /* 2357c478bd9Sstevel@tonic-gate * disallow names consisting only of digits/dots, unless 2367c478bd9Sstevel@tonic-gate * they end in a dot. 2377c478bd9Sstevel@tonic-gate */ 2387c478bd9Sstevel@tonic-gate if (isdigit(name[0])) 2397c478bd9Sstevel@tonic-gate for (cp = name; /*EMPTY*/; ++cp) { 2407c478bd9Sstevel@tonic-gate if (!*cp) { 2417c478bd9Sstevel@tonic-gate if (*--cp == '.') 2427c478bd9Sstevel@tonic-gate break; 2437c478bd9Sstevel@tonic-gate h_errno = HOST_NOT_FOUND; 2447c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 2457c478bd9Sstevel@tonic-gate } 2467c478bd9Sstevel@tonic-gate if (!isdigit(*cp) && *cp != '.') 2477c478bd9Sstevel@tonic-gate break; 2487c478bd9Sstevel@tonic-gate } 2497c478bd9Sstevel@tonic-gate 2507c478bd9Sstevel@tonic-gate if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof (buf))) < 0) { 2517c478bd9Sstevel@tonic-gate #ifdef DEBUG 2527c478bd9Sstevel@tonic-gate if (_res.options & RES_DEBUG) 2537c478bd9Sstevel@tonic-gate printf("res_search failed\n"); 2547c478bd9Sstevel@tonic-gate #endif 2557c478bd9Sstevel@tonic-gate if (errno == ECONNREFUSED) 2567c478bd9Sstevel@tonic-gate return (_gethtbyname(name)); 2577c478bd9Sstevel@tonic-gate else 2587c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 2597c478bd9Sstevel@tonic-gate } 2607c478bd9Sstevel@tonic-gate return (getanswer(&buf, n, 0)); 2617c478bd9Sstevel@tonic-gate } 2627c478bd9Sstevel@tonic-gate 2637c478bd9Sstevel@tonic-gate static struct hostent * 2647c478bd9Sstevel@tonic-gate _getrhbyaddr(addr, len, type) 2657c478bd9Sstevel@tonic-gate char *addr; 2667c478bd9Sstevel@tonic-gate int len, type; 2677c478bd9Sstevel@tonic-gate { 2687c478bd9Sstevel@tonic-gate int n; 2697c478bd9Sstevel@tonic-gate querybuf buf; 2707c478bd9Sstevel@tonic-gate register struct hostent *hp; 2717c478bd9Sstevel@tonic-gate char qbuf[MAXDNAME]; 2727c478bd9Sstevel@tonic-gate static struct hostent *_gethtbyaddr(); 2737c478bd9Sstevel@tonic-gate 2747c478bd9Sstevel@tonic-gate if (type != AF_INET) 2757c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 2767c478bd9Sstevel@tonic-gate (void) sprintf(qbuf, "%d.%d.%d.%d.in-addr.arpa", 2777c478bd9Sstevel@tonic-gate ((unsigned)addr[3] & 0xff), 2787c478bd9Sstevel@tonic-gate ((unsigned)addr[2] & 0xff), 2797c478bd9Sstevel@tonic-gate ((unsigned)addr[1] & 0xff), 2807c478bd9Sstevel@tonic-gate ((unsigned)addr[0] & 0xff)); 2817c478bd9Sstevel@tonic-gate n = res_query(qbuf, C_IN, T_PTR, (char *)&buf, sizeof (buf)); 2827c478bd9Sstevel@tonic-gate if (n < 0) { 2837c478bd9Sstevel@tonic-gate #ifdef DEBUG 2847c478bd9Sstevel@tonic-gate if (_res.options & RES_DEBUG) 2857c478bd9Sstevel@tonic-gate printf("res_query failed\n"); 2867c478bd9Sstevel@tonic-gate #endif 2877c478bd9Sstevel@tonic-gate if (errno == ECONNREFUSED) 2887c478bd9Sstevel@tonic-gate return (_gethtbyaddr(addr, len, type)); 2897c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 2907c478bd9Sstevel@tonic-gate } 2917c478bd9Sstevel@tonic-gate hp = getanswer(&buf, n, 1); 2927c478bd9Sstevel@tonic-gate if (hp == NULL) 2937c478bd9Sstevel@tonic-gate return ((struct hostent *) NULL); 2947c478bd9Sstevel@tonic-gate hp->h_addrtype = type; 2957c478bd9Sstevel@tonic-gate hp->h_length = len; 2967c478bd9Sstevel@tonic-gate h_addr_ptrs[0] = (char *)&host_addr; 2977c478bd9Sstevel@tonic-gate h_addr_ptrs[1] = (char *)0; 2987c478bd9Sstevel@tonic-gate host_addr = *(struct in_addr *)addr; 2997c478bd9Sstevel@tonic-gate return (hp); 3007c478bd9Sstevel@tonic-gate } 3017c478bd9Sstevel@tonic-gate 3027c478bd9Sstevel@tonic-gate /* 3037c478bd9Sstevel@tonic-gate * First we get what the PTR record says, but do an extra call 3047c478bd9Sstevel@tonic-gate * to gethostbyname() to make sure that someone is not trying to 3057c478bd9Sstevel@tonic-gate * spoof us. Hopefully this is not done that often, so good 3067c478bd9Sstevel@tonic-gate * performance is not really an issue. 3077c478bd9Sstevel@tonic-gate */ 3087c478bd9Sstevel@tonic-gate struct hostent * 3097c478bd9Sstevel@tonic-gate res_gethostbyaddr(addr, len, type) 3107c478bd9Sstevel@tonic-gate char *addr; 3117c478bd9Sstevel@tonic-gate int len; 3127c478bd9Sstevel@tonic-gate int type; 3137c478bd9Sstevel@tonic-gate { 3147c478bd9Sstevel@tonic-gate char **a, hbuf[MAXHOSTNAMELEN]; 3157c478bd9Sstevel@tonic-gate struct hostent *hp, *hp2; 3167c478bd9Sstevel@tonic-gate 3177c478bd9Sstevel@tonic-gate if ((hp = _getrhbyaddr(addr, len, type)) == (struct hostent *)NULL) 3187c478bd9Sstevel@tonic-gate return ((struct hostent *)NULL); 3197c478bd9Sstevel@tonic-gate 3207c478bd9Sstevel@tonic-gate /* hang on to what we got as an answer */ 3217c478bd9Sstevel@tonic-gate (void) strcpy(hbuf, hp->h_name); 3227c478bd9Sstevel@tonic-gate 3237c478bd9Sstevel@tonic-gate /* check to make sure by doing a forward query */ 3247c478bd9Sstevel@tonic-gate if ((hp2 = res_gethostbyname(hbuf)) != (struct hostent *)NULL) 3257c478bd9Sstevel@tonic-gate for (a = hp2->h_addr_list; *a; a++) 3267c478bd9Sstevel@tonic-gate #ifdef SYSV 3277c478bd9Sstevel@tonic-gate if (memcmp(*a, addr, hp2->h_length) == 0) 3287c478bd9Sstevel@tonic-gate #else 3297c478bd9Sstevel@tonic-gate if (bcmp(*a, addr, hp2->h_length) == 0) 3307c478bd9Sstevel@tonic-gate #endif 3317c478bd9Sstevel@tonic-gate return (hp2); 3327c478bd9Sstevel@tonic-gate 3337c478bd9Sstevel@tonic-gate /* 3347c478bd9Sstevel@tonic-gate * we've been spoofed, make sure to log it. 3357c478bd9Sstevel@tonic-gate * XXX - syslog needs a security priority level. 3367c478bd9Sstevel@tonic-gate */ 3377c478bd9Sstevel@tonic-gate syslog(LOG_NOTICE, "gethostbyaddr: %s != %s", hbuf, 3387c478bd9Sstevel@tonic-gate inet_ntoa(*(struct in_addr *)addr)); 3397c478bd9Sstevel@tonic-gate return ((struct hostent *)NULL); 3407c478bd9Sstevel@tonic-gate } 3417c478bd9Sstevel@tonic-gate 342*6a1c6faaSanay static void 343*6a1c6faaSanay _sethtent(int f) 3447c478bd9Sstevel@tonic-gate { 345*6a1c6faaSanay if (__res_no_hosts_fallback()) return; 3467c478bd9Sstevel@tonic-gate 3477c478bd9Sstevel@tonic-gate if (hostf == NULL) 3487c478bd9Sstevel@tonic-gate hostf = fopen(HOSTDB, "r"); 3497c478bd9Sstevel@tonic-gate else 3507c478bd9Sstevel@tonic-gate rewind(hostf); 3517c478bd9Sstevel@tonic-gate stayopen |= f; 3527c478bd9Sstevel@tonic-gate } 3537c478bd9Sstevel@tonic-gate 354*6a1c6faaSanay static void 355*6a1c6faaSanay _endhtent(void) 3567c478bd9Sstevel@tonic-gate { 357*6a1c6faaSanay if (__res_no_hosts_fallback()) return; 3587c478bd9Sstevel@tonic-gate 3597c478bd9Sstevel@tonic-gate if (hostf && !stayopen) { 3607c478bd9Sstevel@tonic-gate (void) fclose(hostf); 3617c478bd9Sstevel@tonic-gate hostf = NULL; 3627c478bd9Sstevel@tonic-gate } 3637c478bd9Sstevel@tonic-gate } 3647c478bd9Sstevel@tonic-gate 3657c478bd9Sstevel@tonic-gate static struct hostent * 3667c478bd9Sstevel@tonic-gate _gethtent() 3677c478bd9Sstevel@tonic-gate { 3687c478bd9Sstevel@tonic-gate char *p; 3697c478bd9Sstevel@tonic-gate register char *cp, **q; 3707c478bd9Sstevel@tonic-gate 3717c478bd9Sstevel@tonic-gate if (__res_no_hosts_fallback()) return(NULL); 3727c478bd9Sstevel@tonic-gate 3737c478bd9Sstevel@tonic-gate if (hostf == NULL && (hostf = fopen(HOSTDB, "r")) == NULL) 3747c478bd9Sstevel@tonic-gate return (NULL); 3757c478bd9Sstevel@tonic-gate again: 3767c478bd9Sstevel@tonic-gate if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL) 3777c478bd9Sstevel@tonic-gate return (NULL); 3787c478bd9Sstevel@tonic-gate if (*p == '#') 3797c478bd9Sstevel@tonic-gate goto again; 3807c478bd9Sstevel@tonic-gate cp = any(p, "#\n"); 3817c478bd9Sstevel@tonic-gate if (cp == NULL) 3827c478bd9Sstevel@tonic-gate goto again; 3837c478bd9Sstevel@tonic-gate *cp = '\0'; 3847c478bd9Sstevel@tonic-gate cp = any(p, " \t"); 3857c478bd9Sstevel@tonic-gate if (cp == NULL) 3867c478bd9Sstevel@tonic-gate goto again; 3877c478bd9Sstevel@tonic-gate *cp++ = '\0'; 3887c478bd9Sstevel@tonic-gate /* THIS STUFF IS INTERNET SPECIFIC */ 3897c478bd9Sstevel@tonic-gate #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ 3907c478bd9Sstevel@tonic-gate host.h_addr_list = host_addrs; 3917c478bd9Sstevel@tonic-gate #endif 3927c478bd9Sstevel@tonic-gate host.h_addr = hostaddr; 3937c478bd9Sstevel@tonic-gate *((u_long *)host.h_addr) = inet_addr(p); 3947c478bd9Sstevel@tonic-gate host.h_length = sizeof (u_long); 3957c478bd9Sstevel@tonic-gate host.h_addrtype = AF_INET; 3967c478bd9Sstevel@tonic-gate while (*cp == ' ' || *cp == '\t') 3977c478bd9Sstevel@tonic-gate cp++; 3987c478bd9Sstevel@tonic-gate host.h_name = cp; 3997c478bd9Sstevel@tonic-gate q = host.h_aliases = host_aliases; 4007c478bd9Sstevel@tonic-gate cp = any(cp, " \t"); 4017c478bd9Sstevel@tonic-gate if (cp != NULL) 4027c478bd9Sstevel@tonic-gate *cp++ = '\0'; 4037c478bd9Sstevel@tonic-gate while (cp && *cp) { 4047c478bd9Sstevel@tonic-gate if (*cp == ' ' || *cp == '\t') { 4057c478bd9Sstevel@tonic-gate cp++; 4067c478bd9Sstevel@tonic-gate continue; 4077c478bd9Sstevel@tonic-gate } 4087c478bd9Sstevel@tonic-gate if (q < &host_aliases[MAXALIASES - 1]) 4097c478bd9Sstevel@tonic-gate *q++ = cp; 4107c478bd9Sstevel@tonic-gate cp = any(cp, " \t"); 4117c478bd9Sstevel@tonic-gate if (cp != NULL) 4127c478bd9Sstevel@tonic-gate *cp++ = '\0'; 4137c478bd9Sstevel@tonic-gate } 4147c478bd9Sstevel@tonic-gate *q = NULL; 4157c478bd9Sstevel@tonic-gate return (&host); 4167c478bd9Sstevel@tonic-gate } 4177c478bd9Sstevel@tonic-gate 4187c478bd9Sstevel@tonic-gate static char * 4197c478bd9Sstevel@tonic-gate any(cp, match) 4207c478bd9Sstevel@tonic-gate register char *cp; 4217c478bd9Sstevel@tonic-gate char *match; 4227c478bd9Sstevel@tonic-gate { 4237c478bd9Sstevel@tonic-gate register char *mp, c; 4247c478bd9Sstevel@tonic-gate 4257c478bd9Sstevel@tonic-gate while (c = *cp) { 4267c478bd9Sstevel@tonic-gate for (mp = match; *mp; mp++) 4277c478bd9Sstevel@tonic-gate if (*mp == c) 4287c478bd9Sstevel@tonic-gate return (cp); 4297c478bd9Sstevel@tonic-gate cp++; 4307c478bd9Sstevel@tonic-gate } 4317c478bd9Sstevel@tonic-gate return ((char *)0); 4327c478bd9Sstevel@tonic-gate } 4337c478bd9Sstevel@tonic-gate 4347c478bd9Sstevel@tonic-gate static struct hostent * 4357c478bd9Sstevel@tonic-gate _gethtbyname(name) 4367c478bd9Sstevel@tonic-gate char *name; 4377c478bd9Sstevel@tonic-gate { 4387c478bd9Sstevel@tonic-gate register struct hostent *p; 4397c478bd9Sstevel@tonic-gate register char **cp; 4407c478bd9Sstevel@tonic-gate 4417c478bd9Sstevel@tonic-gate _sethtent(0); 4427c478bd9Sstevel@tonic-gate while (p = _gethtent()) { 4437c478bd9Sstevel@tonic-gate if (strcasecmp(p->h_name, name) == 0) 4447c478bd9Sstevel@tonic-gate break; 4457c478bd9Sstevel@tonic-gate for (cp = p->h_aliases; *cp != 0; cp++) 4467c478bd9Sstevel@tonic-gate if (strcasecmp(*cp, name) == 0) 4477c478bd9Sstevel@tonic-gate goto found; 4487c478bd9Sstevel@tonic-gate } 4497c478bd9Sstevel@tonic-gate found: 4507c478bd9Sstevel@tonic-gate _endhtent(); 4517c478bd9Sstevel@tonic-gate return (p); 4527c478bd9Sstevel@tonic-gate } 4537c478bd9Sstevel@tonic-gate 4547c478bd9Sstevel@tonic-gate static struct hostent * 4557c478bd9Sstevel@tonic-gate _gethtbyaddr(addr, len, type) 4567c478bd9Sstevel@tonic-gate char *addr; 4577c478bd9Sstevel@tonic-gate int len, type; 4587c478bd9Sstevel@tonic-gate { 4597c478bd9Sstevel@tonic-gate register struct hostent *p; 4607c478bd9Sstevel@tonic-gate 4617c478bd9Sstevel@tonic-gate _sethtent(0); 4627c478bd9Sstevel@tonic-gate while (p = _gethtent()) 4637c478bd9Sstevel@tonic-gate #ifdef SYSV 4647c478bd9Sstevel@tonic-gate if (p->h_addrtype == type && !memcmp(p->h_addr, addr, len)) 4657c478bd9Sstevel@tonic-gate #else 4667c478bd9Sstevel@tonic-gate if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len)) 4677c478bd9Sstevel@tonic-gate #endif 4687c478bd9Sstevel@tonic-gate break; 4697c478bd9Sstevel@tonic-gate _endhtent(); 4707c478bd9Sstevel@tonic-gate return (p); 4717c478bd9Sstevel@tonic-gate } 472