1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Copyright (c) 1985, 1988 Regents of the University of California. 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * Redistribution and use in source and binary forms are permitted 6*0Sstevel@tonic-gate * provided that this notice is preserved and that due credit is given 7*0Sstevel@tonic-gate * to the University of California at Berkeley. The name of the University 8*0Sstevel@tonic-gate * may not be used to endorse or promote products derived from this 9*0Sstevel@tonic-gate * software without specific prior written permission. This software 10*0Sstevel@tonic-gate * is provided ``as is'' without express or implied warranty. 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate */ 13*0Sstevel@tonic-gate 14*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* SunOS 1.11; UCB 6.32 */ 15*0Sstevel@tonic-gate 16*0Sstevel@tonic-gate #include "synonyms.h" 17*0Sstevel@tonic-gate 18*0Sstevel@tonic-gate #include <sys/param.h> 19*0Sstevel@tonic-gate #include <sys/socket.h> 20*0Sstevel@tonic-gate #include <netinet/in.h> 21*0Sstevel@tonic-gate #include <ctype.h> 22*0Sstevel@tonic-gate #include <netdb.h> 23*0Sstevel@tonic-gate #include <stdio.h> 24*0Sstevel@tonic-gate #include <errno.h> 25*0Sstevel@tonic-gate #include <arpa/inet.h> 26*0Sstevel@tonic-gate #include <arpa/nameser.h> 27*0Sstevel@tonic-gate #include <resolv.h> 28*0Sstevel@tonic-gate #include <syslog.h> 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate /* 31*0Sstevel@tonic-gate * When the name service switch calls libresolv, it doesn't want fallback 32*0Sstevel@tonic-gate * to /etc/hosts, so we provide a method to turn it off. 33*0Sstevel@tonic-gate */ 34*0Sstevel@tonic-gate static int no_hosts_fallback = 0; 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate void 37*0Sstevel@tonic-gate __res_set_no_hosts_fallback(void) { 38*0Sstevel@tonic-gate no_hosts_fallback = 1; 39*0Sstevel@tonic-gate } 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate static int 42*0Sstevel@tonic-gate __res_no_hosts_fallback(void) { 43*0Sstevel@tonic-gate return(no_hosts_fallback); 44*0Sstevel@tonic-gate } 45*0Sstevel@tonic-gate 46*0Sstevel@tonic-gate static char *h_addr_ptrs[MAXADDRS + 1]; 47*0Sstevel@tonic-gate 48*0Sstevel@tonic-gate static struct hostent host; 49*0Sstevel@tonic-gate static char *host_aliases[MAXALIASES]; 50*0Sstevel@tonic-gate static char hostbuf[BUFSIZ+1]; 51*0Sstevel@tonic-gate static struct in_addr host_addr; 52*0Sstevel@tonic-gate static char HOSTDB[] = "/etc/hosts"; 53*0Sstevel@tonic-gate static FILE *hostf = NULL; 54*0Sstevel@tonic-gate static char hostaddr[MAXADDRS]; 55*0Sstevel@tonic-gate static char *host_addrs[2]; 56*0Sstevel@tonic-gate static int stayopen = 0; 57*0Sstevel@tonic-gate static char *any(); 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate #if PACKETSZ > 1024 60*0Sstevel@tonic-gate #define MAXPACKET PACKETSZ 61*0Sstevel@tonic-gate #else 62*0Sstevel@tonic-gate #define MAXPACKET 1024 63*0Sstevel@tonic-gate #endif 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate typedef union { 66*0Sstevel@tonic-gate HEADER hdr; 67*0Sstevel@tonic-gate u_char buf[MAXPACKET]; 68*0Sstevel@tonic-gate } querybuf; 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate static union { 71*0Sstevel@tonic-gate long al; 72*0Sstevel@tonic-gate char ac; 73*0Sstevel@tonic-gate } align; 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate int h_errno; 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate static struct hostent * 79*0Sstevel@tonic-gate getanswer(answer, anslen, iquery) 80*0Sstevel@tonic-gate querybuf *answer; 81*0Sstevel@tonic-gate int anslen; 82*0Sstevel@tonic-gate int iquery; 83*0Sstevel@tonic-gate { 84*0Sstevel@tonic-gate register HEADER *hp; 85*0Sstevel@tonic-gate register u_char *cp; 86*0Sstevel@tonic-gate register int n; 87*0Sstevel@tonic-gate u_char *eom; 88*0Sstevel@tonic-gate char *bp, **ap; 89*0Sstevel@tonic-gate int type, class, buflen, ancount, qdcount; 90*0Sstevel@tonic-gate int haveanswer, getclass = C_ANY; 91*0Sstevel@tonic-gate char **hap; 92*0Sstevel@tonic-gate 93*0Sstevel@tonic-gate eom = answer->buf + anslen; 94*0Sstevel@tonic-gate /* 95*0Sstevel@tonic-gate * find first satisfactory answer 96*0Sstevel@tonic-gate */ 97*0Sstevel@tonic-gate hp = &answer->hdr; 98*0Sstevel@tonic-gate ancount = ntohs(hp->ancount); 99*0Sstevel@tonic-gate qdcount = ntohs(hp->qdcount); 100*0Sstevel@tonic-gate bp = hostbuf; 101*0Sstevel@tonic-gate buflen = sizeof (hostbuf); 102*0Sstevel@tonic-gate cp = answer->buf + sizeof (HEADER); 103*0Sstevel@tonic-gate if (qdcount) { 104*0Sstevel@tonic-gate if (iquery) { 105*0Sstevel@tonic-gate if ((n = dn_expand((char *)answer->buf, eom, 106*0Sstevel@tonic-gate cp, bp, buflen)) < 0) { 107*0Sstevel@tonic-gate h_errno = NO_RECOVERY; 108*0Sstevel@tonic-gate return ((struct hostent *) NULL); 109*0Sstevel@tonic-gate } 110*0Sstevel@tonic-gate cp += n + QFIXEDSZ; 111*0Sstevel@tonic-gate host.h_name = bp; 112*0Sstevel@tonic-gate n = strlen(bp) + 1; 113*0Sstevel@tonic-gate bp += n; 114*0Sstevel@tonic-gate buflen -= n; 115*0Sstevel@tonic-gate } else 116*0Sstevel@tonic-gate cp += dn_skipname(cp, eom) + QFIXEDSZ; 117*0Sstevel@tonic-gate while (--qdcount > 0) 118*0Sstevel@tonic-gate cp += dn_skipname(cp, eom) + QFIXEDSZ; 119*0Sstevel@tonic-gate } else if (iquery) { 120*0Sstevel@tonic-gate if (hp->aa) 121*0Sstevel@tonic-gate h_errno = HOST_NOT_FOUND; 122*0Sstevel@tonic-gate else 123*0Sstevel@tonic-gate h_errno = TRY_AGAIN; 124*0Sstevel@tonic-gate return ((struct hostent *) NULL); 125*0Sstevel@tonic-gate } 126*0Sstevel@tonic-gate ap = host_aliases; 127*0Sstevel@tonic-gate host.h_aliases = host_aliases; 128*0Sstevel@tonic-gate hap = h_addr_ptrs; 129*0Sstevel@tonic-gate #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ 130*0Sstevel@tonic-gate host.h_addr_list = h_addr_ptrs; 131*0Sstevel@tonic-gate #endif 132*0Sstevel@tonic-gate haveanswer = 0; 133*0Sstevel@tonic-gate while (--ancount >= 0 && cp < eom && haveanswer < MAXADDRS) { 134*0Sstevel@tonic-gate if ((n = dn_expand((char *)answer->buf, eom, 135*0Sstevel@tonic-gate cp, bp, buflen)) < 0) 136*0Sstevel@tonic-gate break; 137*0Sstevel@tonic-gate cp += n; 138*0Sstevel@tonic-gate type = _getshort(cp); 139*0Sstevel@tonic-gate cp += sizeof (u_short); 140*0Sstevel@tonic-gate class = _getshort(cp); 141*0Sstevel@tonic-gate cp += sizeof (u_short) + sizeof (u_long); 142*0Sstevel@tonic-gate n = _getshort(cp); 143*0Sstevel@tonic-gate cp += sizeof (u_short); 144*0Sstevel@tonic-gate if (type == T_CNAME) { 145*0Sstevel@tonic-gate cp += n; 146*0Sstevel@tonic-gate if (ap >= &host_aliases[MAXALIASES-1]) 147*0Sstevel@tonic-gate continue; 148*0Sstevel@tonic-gate *ap++ = bp; 149*0Sstevel@tonic-gate n = strlen(bp) + 1; 150*0Sstevel@tonic-gate bp += n; 151*0Sstevel@tonic-gate buflen -= n; 152*0Sstevel@tonic-gate continue; 153*0Sstevel@tonic-gate } 154*0Sstevel@tonic-gate if (iquery && type == T_PTR) { 155*0Sstevel@tonic-gate if ((n = dn_expand((char *)answer->buf, eom, 156*0Sstevel@tonic-gate cp, bp, buflen)) < 0) { 157*0Sstevel@tonic-gate cp += n; 158*0Sstevel@tonic-gate continue; 159*0Sstevel@tonic-gate } 160*0Sstevel@tonic-gate cp += n; 161*0Sstevel@tonic-gate host.h_name = bp; 162*0Sstevel@tonic-gate return (&host); 163*0Sstevel@tonic-gate } 164*0Sstevel@tonic-gate if (iquery || type != T_A) { 165*0Sstevel@tonic-gate #ifdef DEBUG 166*0Sstevel@tonic-gate if (_res.options & RES_DEBUG) 167*0Sstevel@tonic-gate printf("unexpected answer type %d, size %d\n", 168*0Sstevel@tonic-gate type, n); 169*0Sstevel@tonic-gate #endif 170*0Sstevel@tonic-gate cp += n; 171*0Sstevel@tonic-gate continue; 172*0Sstevel@tonic-gate } 173*0Sstevel@tonic-gate if (haveanswer) { 174*0Sstevel@tonic-gate if (n != host.h_length) { 175*0Sstevel@tonic-gate cp += n; 176*0Sstevel@tonic-gate continue; 177*0Sstevel@tonic-gate } 178*0Sstevel@tonic-gate if (class != getclass) { 179*0Sstevel@tonic-gate cp += n; 180*0Sstevel@tonic-gate continue; 181*0Sstevel@tonic-gate } 182*0Sstevel@tonic-gate } else { 183*0Sstevel@tonic-gate host.h_length = n; 184*0Sstevel@tonic-gate getclass = class; 185*0Sstevel@tonic-gate host.h_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC; 186*0Sstevel@tonic-gate if (!iquery) { 187*0Sstevel@tonic-gate host.h_name = bp; 188*0Sstevel@tonic-gate bp += strlen(bp) + 1; 189*0Sstevel@tonic-gate } 190*0Sstevel@tonic-gate } 191*0Sstevel@tonic-gate 192*0Sstevel@tonic-gate bp += sizeof (align) - ((u_long)bp % sizeof (align)); 193*0Sstevel@tonic-gate 194*0Sstevel@tonic-gate if (bp + n >= &hostbuf[sizeof (hostbuf)]) { 195*0Sstevel@tonic-gate #ifdef DEBUG 196*0Sstevel@tonic-gate if (_res.options & RES_DEBUG) 197*0Sstevel@tonic-gate printf("size (%d) too big\n", n); 198*0Sstevel@tonic-gate #endif 199*0Sstevel@tonic-gate break; 200*0Sstevel@tonic-gate } 201*0Sstevel@tonic-gate #ifdef SYSV 202*0Sstevel@tonic-gate memcpy((void *)(*hap++ = bp), (void *)cp, n); 203*0Sstevel@tonic-gate #else 204*0Sstevel@tonic-gate bcopy(cp, *hap++ = bp, n); 205*0Sstevel@tonic-gate #endif 206*0Sstevel@tonic-gate bp += n; 207*0Sstevel@tonic-gate cp += n; 208*0Sstevel@tonic-gate haveanswer++; 209*0Sstevel@tonic-gate } 210*0Sstevel@tonic-gate if (haveanswer) { 211*0Sstevel@tonic-gate *ap = NULL; 212*0Sstevel@tonic-gate #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ 213*0Sstevel@tonic-gate *hap = NULL; 214*0Sstevel@tonic-gate #else 215*0Sstevel@tonic-gate host.h_addr = h_addr_ptrs[0]; 216*0Sstevel@tonic-gate #endif 217*0Sstevel@tonic-gate return (&host); 218*0Sstevel@tonic-gate } else { 219*0Sstevel@tonic-gate h_errno = TRY_AGAIN; 220*0Sstevel@tonic-gate return ((struct hostent *) NULL); 221*0Sstevel@tonic-gate } 222*0Sstevel@tonic-gate } 223*0Sstevel@tonic-gate 224*0Sstevel@tonic-gate struct hostent * 225*0Sstevel@tonic-gate res_gethostbyname(name) 226*0Sstevel@tonic-gate char *name; 227*0Sstevel@tonic-gate { 228*0Sstevel@tonic-gate querybuf buf; 229*0Sstevel@tonic-gate register char *cp; 230*0Sstevel@tonic-gate int n; 231*0Sstevel@tonic-gate struct hostent *hp, *gethostdomain(); 232*0Sstevel@tonic-gate static struct hostent *_gethtbyname(); 233*0Sstevel@tonic-gate 234*0Sstevel@tonic-gate /* 235*0Sstevel@tonic-gate * disallow names consisting only of digits/dots, unless 236*0Sstevel@tonic-gate * they end in a dot. 237*0Sstevel@tonic-gate */ 238*0Sstevel@tonic-gate if (isdigit(name[0])) 239*0Sstevel@tonic-gate for (cp = name; /*EMPTY*/; ++cp) { 240*0Sstevel@tonic-gate if (!*cp) { 241*0Sstevel@tonic-gate if (*--cp == '.') 242*0Sstevel@tonic-gate break; 243*0Sstevel@tonic-gate h_errno = HOST_NOT_FOUND; 244*0Sstevel@tonic-gate return ((struct hostent *) NULL); 245*0Sstevel@tonic-gate } 246*0Sstevel@tonic-gate if (!isdigit(*cp) && *cp != '.') 247*0Sstevel@tonic-gate break; 248*0Sstevel@tonic-gate } 249*0Sstevel@tonic-gate 250*0Sstevel@tonic-gate if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof (buf))) < 0) { 251*0Sstevel@tonic-gate #ifdef DEBUG 252*0Sstevel@tonic-gate if (_res.options & RES_DEBUG) 253*0Sstevel@tonic-gate printf("res_search failed\n"); 254*0Sstevel@tonic-gate #endif 255*0Sstevel@tonic-gate if (errno == ECONNREFUSED) 256*0Sstevel@tonic-gate return (_gethtbyname(name)); 257*0Sstevel@tonic-gate else 258*0Sstevel@tonic-gate return ((struct hostent *) NULL); 259*0Sstevel@tonic-gate } 260*0Sstevel@tonic-gate return (getanswer(&buf, n, 0)); 261*0Sstevel@tonic-gate } 262*0Sstevel@tonic-gate 263*0Sstevel@tonic-gate static struct hostent * 264*0Sstevel@tonic-gate _getrhbyaddr(addr, len, type) 265*0Sstevel@tonic-gate char *addr; 266*0Sstevel@tonic-gate int len, type; 267*0Sstevel@tonic-gate { 268*0Sstevel@tonic-gate int n; 269*0Sstevel@tonic-gate querybuf buf; 270*0Sstevel@tonic-gate register struct hostent *hp; 271*0Sstevel@tonic-gate char qbuf[MAXDNAME]; 272*0Sstevel@tonic-gate static struct hostent *_gethtbyaddr(); 273*0Sstevel@tonic-gate 274*0Sstevel@tonic-gate if (type != AF_INET) 275*0Sstevel@tonic-gate return ((struct hostent *) NULL); 276*0Sstevel@tonic-gate (void) sprintf(qbuf, "%d.%d.%d.%d.in-addr.arpa", 277*0Sstevel@tonic-gate ((unsigned)addr[3] & 0xff), 278*0Sstevel@tonic-gate ((unsigned)addr[2] & 0xff), 279*0Sstevel@tonic-gate ((unsigned)addr[1] & 0xff), 280*0Sstevel@tonic-gate ((unsigned)addr[0] & 0xff)); 281*0Sstevel@tonic-gate n = res_query(qbuf, C_IN, T_PTR, (char *)&buf, sizeof (buf)); 282*0Sstevel@tonic-gate if (n < 0) { 283*0Sstevel@tonic-gate #ifdef DEBUG 284*0Sstevel@tonic-gate if (_res.options & RES_DEBUG) 285*0Sstevel@tonic-gate printf("res_query failed\n"); 286*0Sstevel@tonic-gate #endif 287*0Sstevel@tonic-gate if (errno == ECONNREFUSED) 288*0Sstevel@tonic-gate return (_gethtbyaddr(addr, len, type)); 289*0Sstevel@tonic-gate return ((struct hostent *) NULL); 290*0Sstevel@tonic-gate } 291*0Sstevel@tonic-gate hp = getanswer(&buf, n, 1); 292*0Sstevel@tonic-gate if (hp == NULL) 293*0Sstevel@tonic-gate return ((struct hostent *) NULL); 294*0Sstevel@tonic-gate hp->h_addrtype = type; 295*0Sstevel@tonic-gate hp->h_length = len; 296*0Sstevel@tonic-gate h_addr_ptrs[0] = (char *)&host_addr; 297*0Sstevel@tonic-gate h_addr_ptrs[1] = (char *)0; 298*0Sstevel@tonic-gate host_addr = *(struct in_addr *)addr; 299*0Sstevel@tonic-gate return (hp); 300*0Sstevel@tonic-gate } 301*0Sstevel@tonic-gate 302*0Sstevel@tonic-gate /* 303*0Sstevel@tonic-gate * First we get what the PTR record says, but do an extra call 304*0Sstevel@tonic-gate * to gethostbyname() to make sure that someone is not trying to 305*0Sstevel@tonic-gate * spoof us. Hopefully this is not done that often, so good 306*0Sstevel@tonic-gate * performance is not really an issue. 307*0Sstevel@tonic-gate */ 308*0Sstevel@tonic-gate struct hostent * 309*0Sstevel@tonic-gate res_gethostbyaddr(addr, len, type) 310*0Sstevel@tonic-gate char *addr; 311*0Sstevel@tonic-gate int len; 312*0Sstevel@tonic-gate int type; 313*0Sstevel@tonic-gate { 314*0Sstevel@tonic-gate char **a, hbuf[MAXHOSTNAMELEN]; 315*0Sstevel@tonic-gate struct hostent *hp, *hp2; 316*0Sstevel@tonic-gate 317*0Sstevel@tonic-gate if ((hp = _getrhbyaddr(addr, len, type)) == (struct hostent *)NULL) 318*0Sstevel@tonic-gate return ((struct hostent *)NULL); 319*0Sstevel@tonic-gate 320*0Sstevel@tonic-gate /* hang on to what we got as an answer */ 321*0Sstevel@tonic-gate (void) strcpy(hbuf, hp->h_name); 322*0Sstevel@tonic-gate 323*0Sstevel@tonic-gate /* check to make sure by doing a forward query */ 324*0Sstevel@tonic-gate if ((hp2 = res_gethostbyname(hbuf)) != (struct hostent *)NULL) 325*0Sstevel@tonic-gate for (a = hp2->h_addr_list; *a; a++) 326*0Sstevel@tonic-gate #ifdef SYSV 327*0Sstevel@tonic-gate if (memcmp(*a, addr, hp2->h_length) == 0) 328*0Sstevel@tonic-gate #else 329*0Sstevel@tonic-gate if (bcmp(*a, addr, hp2->h_length) == 0) 330*0Sstevel@tonic-gate #endif 331*0Sstevel@tonic-gate return (hp2); 332*0Sstevel@tonic-gate 333*0Sstevel@tonic-gate /* 334*0Sstevel@tonic-gate * we've been spoofed, make sure to log it. 335*0Sstevel@tonic-gate * XXX - syslog needs a security priority level. 336*0Sstevel@tonic-gate */ 337*0Sstevel@tonic-gate syslog(LOG_NOTICE, "gethostbyaddr: %s != %s", hbuf, 338*0Sstevel@tonic-gate inet_ntoa(*(struct in_addr *)addr)); 339*0Sstevel@tonic-gate return ((struct hostent *)NULL); 340*0Sstevel@tonic-gate } 341*0Sstevel@tonic-gate 342*0Sstevel@tonic-gate static 343*0Sstevel@tonic-gate _sethtent(f) 344*0Sstevel@tonic-gate int f; 345*0Sstevel@tonic-gate { 346*0Sstevel@tonic-gate if (__res_no_hosts_fallback()) return(0); 347*0Sstevel@tonic-gate 348*0Sstevel@tonic-gate if (hostf == NULL) 349*0Sstevel@tonic-gate hostf = fopen(HOSTDB, "r"); 350*0Sstevel@tonic-gate else 351*0Sstevel@tonic-gate rewind(hostf); 352*0Sstevel@tonic-gate stayopen |= f; 353*0Sstevel@tonic-gate } 354*0Sstevel@tonic-gate 355*0Sstevel@tonic-gate static 356*0Sstevel@tonic-gate _endhtent() 357*0Sstevel@tonic-gate { 358*0Sstevel@tonic-gate if (__res_no_hosts_fallback()) return(0); 359*0Sstevel@tonic-gate 360*0Sstevel@tonic-gate if (hostf && !stayopen) { 361*0Sstevel@tonic-gate (void) fclose(hostf); 362*0Sstevel@tonic-gate hostf = NULL; 363*0Sstevel@tonic-gate } 364*0Sstevel@tonic-gate } 365*0Sstevel@tonic-gate 366*0Sstevel@tonic-gate static struct hostent * 367*0Sstevel@tonic-gate _gethtent() 368*0Sstevel@tonic-gate { 369*0Sstevel@tonic-gate char *p; 370*0Sstevel@tonic-gate register char *cp, **q; 371*0Sstevel@tonic-gate 372*0Sstevel@tonic-gate if (__res_no_hosts_fallback()) return(NULL); 373*0Sstevel@tonic-gate 374*0Sstevel@tonic-gate if (hostf == NULL && (hostf = fopen(HOSTDB, "r")) == NULL) 375*0Sstevel@tonic-gate return (NULL); 376*0Sstevel@tonic-gate again: 377*0Sstevel@tonic-gate if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL) 378*0Sstevel@tonic-gate return (NULL); 379*0Sstevel@tonic-gate if (*p == '#') 380*0Sstevel@tonic-gate goto again; 381*0Sstevel@tonic-gate cp = any(p, "#\n"); 382*0Sstevel@tonic-gate if (cp == NULL) 383*0Sstevel@tonic-gate goto again; 384*0Sstevel@tonic-gate *cp = '\0'; 385*0Sstevel@tonic-gate cp = any(p, " \t"); 386*0Sstevel@tonic-gate if (cp == NULL) 387*0Sstevel@tonic-gate goto again; 388*0Sstevel@tonic-gate *cp++ = '\0'; 389*0Sstevel@tonic-gate /* THIS STUFF IS INTERNET SPECIFIC */ 390*0Sstevel@tonic-gate #if BSD >= 43 || defined(h_addr) /* new-style hostent structure */ 391*0Sstevel@tonic-gate host.h_addr_list = host_addrs; 392*0Sstevel@tonic-gate #endif 393*0Sstevel@tonic-gate host.h_addr = hostaddr; 394*0Sstevel@tonic-gate *((u_long *)host.h_addr) = inet_addr(p); 395*0Sstevel@tonic-gate host.h_length = sizeof (u_long); 396*0Sstevel@tonic-gate host.h_addrtype = AF_INET; 397*0Sstevel@tonic-gate while (*cp == ' ' || *cp == '\t') 398*0Sstevel@tonic-gate cp++; 399*0Sstevel@tonic-gate host.h_name = cp; 400*0Sstevel@tonic-gate q = host.h_aliases = host_aliases; 401*0Sstevel@tonic-gate cp = any(cp, " \t"); 402*0Sstevel@tonic-gate if (cp != NULL) 403*0Sstevel@tonic-gate *cp++ = '\0'; 404*0Sstevel@tonic-gate while (cp && *cp) { 405*0Sstevel@tonic-gate if (*cp == ' ' || *cp == '\t') { 406*0Sstevel@tonic-gate cp++; 407*0Sstevel@tonic-gate continue; 408*0Sstevel@tonic-gate } 409*0Sstevel@tonic-gate if (q < &host_aliases[MAXALIASES - 1]) 410*0Sstevel@tonic-gate *q++ = cp; 411*0Sstevel@tonic-gate cp = any(cp, " \t"); 412*0Sstevel@tonic-gate if (cp != NULL) 413*0Sstevel@tonic-gate *cp++ = '\0'; 414*0Sstevel@tonic-gate } 415*0Sstevel@tonic-gate *q = NULL; 416*0Sstevel@tonic-gate return (&host); 417*0Sstevel@tonic-gate } 418*0Sstevel@tonic-gate 419*0Sstevel@tonic-gate static char * 420*0Sstevel@tonic-gate any(cp, match) 421*0Sstevel@tonic-gate register char *cp; 422*0Sstevel@tonic-gate char *match; 423*0Sstevel@tonic-gate { 424*0Sstevel@tonic-gate register char *mp, c; 425*0Sstevel@tonic-gate 426*0Sstevel@tonic-gate while (c = *cp) { 427*0Sstevel@tonic-gate for (mp = match; *mp; mp++) 428*0Sstevel@tonic-gate if (*mp == c) 429*0Sstevel@tonic-gate return (cp); 430*0Sstevel@tonic-gate cp++; 431*0Sstevel@tonic-gate } 432*0Sstevel@tonic-gate return ((char *)0); 433*0Sstevel@tonic-gate } 434*0Sstevel@tonic-gate 435*0Sstevel@tonic-gate static struct hostent * 436*0Sstevel@tonic-gate _gethtbyname(name) 437*0Sstevel@tonic-gate char *name; 438*0Sstevel@tonic-gate { 439*0Sstevel@tonic-gate register struct hostent *p; 440*0Sstevel@tonic-gate register char **cp; 441*0Sstevel@tonic-gate 442*0Sstevel@tonic-gate _sethtent(0); 443*0Sstevel@tonic-gate while (p = _gethtent()) { 444*0Sstevel@tonic-gate if (strcasecmp(p->h_name, name) == 0) 445*0Sstevel@tonic-gate break; 446*0Sstevel@tonic-gate for (cp = p->h_aliases; *cp != 0; cp++) 447*0Sstevel@tonic-gate if (strcasecmp(*cp, name) == 0) 448*0Sstevel@tonic-gate goto found; 449*0Sstevel@tonic-gate } 450*0Sstevel@tonic-gate found: 451*0Sstevel@tonic-gate _endhtent(); 452*0Sstevel@tonic-gate return (p); 453*0Sstevel@tonic-gate } 454*0Sstevel@tonic-gate 455*0Sstevel@tonic-gate static struct hostent * 456*0Sstevel@tonic-gate _gethtbyaddr(addr, len, type) 457*0Sstevel@tonic-gate char *addr; 458*0Sstevel@tonic-gate int len, type; 459*0Sstevel@tonic-gate { 460*0Sstevel@tonic-gate register struct hostent *p; 461*0Sstevel@tonic-gate 462*0Sstevel@tonic-gate _sethtent(0); 463*0Sstevel@tonic-gate while (p = _gethtent()) 464*0Sstevel@tonic-gate #ifdef SYSV 465*0Sstevel@tonic-gate if (p->h_addrtype == type && !memcmp(p->h_addr, addr, len)) 466*0Sstevel@tonic-gate #else 467*0Sstevel@tonic-gate if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len)) 468*0Sstevel@tonic-gate #endif 469*0Sstevel@tonic-gate break; 470*0Sstevel@tonic-gate _endhtent(); 471*0Sstevel@tonic-gate return (p); 472*0Sstevel@tonic-gate } 473