[unix-history] / usr / src / lib / libc / net / gethostnamadr.c

/*
 * Copyright (c) 1985, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)gethostnamadr.c	6.45 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>

#define	MAXALIASES	35
#define	MAXADDRS	35

static char *h_addr_ptrs[MAXADDRS + 1];

static struct hostent host;
static char *host_aliases[MAXALIASES];
static char hostbuf[BUFSIZ+1];
static struct in_addr host_addr;
static FILE *hostf = NULL;
static char hostaddr[MAXADDRS];
static char *host_addrs[2];
static int stayopen = 0;
char *strpbrk();

#if PACKETSZ > 1024
#define	MAXPACKET	PACKETSZ
#else
#define	MAXPACKET	1024
#endif

typedef union {
    HEADER hdr;
    u_char buf[MAXPACKET];
} querybuf;

typedef union {
    long al;
    char ac;
} align;

int h_errno;

static struct hostent *
getanswer(answer, anslen, iquery)
	querybuf *answer;
	int anslen;
	int iquery;
{
	register HEADER *hp;
	register u_char *cp;
	register int n;
	u_char *eom;
	char *bp, **ap;
	int type, class, buflen, ancount, qdcount;
	int haveanswer, getclass = C_ANY;
	char **hap;

	eom = answer->buf + anslen;
	/*
	 * find first satisfactory answer
	 */
	hp = &answer->hdr;
	ancount = ntohs(hp->ancount);
	qdcount = ntohs(hp->qdcount);
	bp = hostbuf;
	buflen = sizeof(hostbuf);
	cp = answer->buf + sizeof(HEADER);
	if (qdcount) {
		if (iquery) {
			if ((n = dn_expand((u_char *)answer->buf,
			    (u_char *)eom, (u_char *)cp, (u_char *)bp,
			    buflen)) < 0) {
				h_errno = NO_RECOVERY;
				return ((struct hostent *) NULL);
			}
			cp += n + QFIXEDSZ;
			host.h_name = bp;
			n = strlen(bp) + 1;
			bp += n;
			buflen -= n;
		} else
			cp += __dn_skipname(cp, eom) + QFIXEDSZ;
		while (--qdcount > 0)
			cp += __dn_skipname(cp, eom) + QFIXEDSZ;
	} else if (iquery) {
		if (hp->aa)
			h_errno = HOST_NOT_FOUND;
		else
			h_errno = TRY_AGAIN;
		return ((struct hostent *) NULL);
	}
	ap = host_aliases;
	*ap = NULL;
	host.h_aliases = host_aliases;
	hap = h_addr_ptrs;
	*hap = NULL;
#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
	host.h_addr_list = h_addr_ptrs;
#endif
	haveanswer = 0;
	while (--ancount >= 0 && cp < eom) {
		if ((n = dn_expand((u_char *)answer->buf, (u_char *)eom,
		    (u_char *)cp, (u_char *)bp, buflen)) < 0)
			break;
		cp += n;
		type = _getshort(cp);
 		cp += sizeof(u_short);
		class = _getshort(cp);
 		cp += sizeof(u_short) + sizeof(u_long);
		n = _getshort(cp);
		cp += sizeof(u_short);
		if (type == T_CNAME) {
			cp += n;
			if (ap >= &host_aliases[MAXALIASES-1])
				continue;
			*ap++ = bp;
			n = strlen(bp) + 1;
			bp += n;
			buflen -= n;
			continue;
		}
		if (iquery && type == T_PTR) {
			if ((n = dn_expand((u_char *)answer->buf,
			    (u_char *)eom, (u_char *)cp, (u_char *)bp,
			    buflen)) < 0) {
				cp += n;
				continue;
			}
			cp += n;
			host.h_name = bp;
			return(&host);
		}
		if (iquery || type != T_A)  {
#ifdef DEBUG
			if (_res.options & RES_DEBUG)
				printf("unexpected answer type %d, size %d\n",
					type, n);
#endif
			cp += n;
			continue;
		}
		if (haveanswer) {
			if (n != host.h_length) {
				cp += n;
				continue;
			}
			if (class != getclass) {
				cp += n;
				continue;
			}
		} else {
			host.h_length = n;
			getclass = class;
			host.h_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC;
			if (!iquery) {
				host.h_name = bp;
				bp += strlen(bp) + 1;
			}
		}

		bp += sizeof(align) - ((u_long)bp % sizeof(align));

		if (bp + n >= &hostbuf[sizeof(hostbuf)]) {
#ifdef DEBUG
			if (_res.options & RES_DEBUG)
				printf("size (%d) too big\n", n);
#endif
			break;
		}
		bcopy(cp, *hap++ = bp, n);
		bp +=n;
		cp += n;
		haveanswer++;
	}
	if (haveanswer) {
		*ap = NULL;
#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
		*hap = NULL;
#else
		host.h_addr = h_addr_ptrs[0];
#endif
		return (&host);
	} else {
		h_errno = TRY_AGAIN;
		return ((struct hostent *) NULL);
	}
}

struct hostent *
gethostbyname(name)
	char *name;
{
	querybuf buf;
	register char *cp;
	int n;
	extern struct hostent *_gethtbyname();

	/*
	 * disallow names consisting only of digits/dots, unless
	 * they end in a dot.
	 */
	if (isdigit(name[0]))
		for (cp = name;; ++cp) {
			if (!*cp) {
				if (*--cp == '.')
					break;
				/*
				 * All-numeric, no dot at the end.
				 * Fake up a hostent as if we'd actually
				 * done a lookup.  What if someone types
				 * 255.255.255.255?  The test below will
				 * succeed spuriously... ???
				 */
				if ((host_addr.s_addr = inet_addr(name)) == -1) {
					h_errno = HOST_NOT_FOUND;
					return((struct hostent *) NULL);
				}
				host.h_name = name;
				host.h_aliases = host_aliases;
				host_aliases[0] = NULL;
				host.h_addrtype = AF_INET;
				host.h_length = sizeof(u_long);
				h_addr_ptrs[0] = (char *)&host_addr;
				h_addr_ptrs[1] = (char *)0;
#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
				host.h_addr_list = h_addr_ptrs;
#else
				host.h_addr = h_addr_ptrs[0];
#endif
				return (&host);
			}
			if (!isdigit(*cp) && *cp != '.') 
				break;
		}

	if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {
#ifdef DEBUG
		if (_res.options & RES_DEBUG)
			printf("res_search failed\n");
#endif
		if (errno == ECONNREFUSED)
			return (_gethtbyname(name));
		else
			return ((struct hostent *) NULL);
	}
	return (getanswer(&buf, n, 0));
}

struct hostent *
gethostbyaddr(addr, len, type)
	const char *addr;
	int len, type;
{
	int n;
	querybuf buf;
	register struct hostent *hp;
	char qbuf[MAXDNAME];
	extern struct hostent *_gethtbyaddr();
	
	if (type != AF_INET)
		return ((struct hostent *) NULL);
	(void)sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
		((unsigned)addr[3] & 0xff),
		((unsigned)addr[2] & 0xff),
		((unsigned)addr[1] & 0xff),
		((unsigned)addr[0] & 0xff));
	n = res_query(qbuf, C_IN, T_PTR, (char *)&buf, sizeof(buf));
	if (n < 0) {
#ifdef DEBUG
		if (_res.options & RES_DEBUG)
			printf("res_query failed\n");
#endif
		if (errno == ECONNREFUSED)
			return (_gethtbyaddr(addr, len, type));
		return ((struct hostent *) NULL);
	}
	hp = getanswer(&buf, n, 1);
	if (hp == NULL)
		return ((struct hostent *) NULL);
	hp->h_addrtype = type;
	hp->h_length = len;
	h_addr_ptrs[0] = (char *)&host_addr;
	h_addr_ptrs[1] = (char *)0;
	host_addr = *(struct in_addr *)addr;
#if BSD < 43 && !defined(h_addr)	/* new-style hostent structure */
	hp->h_addr = h_addr_ptrs[0];
#endif
	return(hp);
}

_sethtent(f)
	int f;
{
	if (hostf == NULL)
		hostf = fopen(_PATH_HOSTS, "r" );
	else
		rewind(hostf);
	stayopen |= f;
}

_endhtent()
{
	if (hostf && !stayopen) {
		(void) fclose(hostf);
		hostf = NULL;
	}
}

struct hostent *
_gethtent()
{
	char *p;
	register char *cp, **q;

	if (hostf == NULL && (hostf = fopen(_PATH_HOSTS, "r" )) == NULL)
		return (NULL);
again:
	if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL)
		return (NULL);
	if (*p == '#')
		goto again;
	cp = strpbrk(p, "#\n");
	if (cp == NULL)
		goto again;
	*cp = '\0';
	cp = strpbrk(p, " \t");
	if (cp == NULL)
		goto again;
	*cp++ = '\0';
	/* THIS STUFF IS INTERNET SPECIFIC */
#if BSD >= 43 || defined(h_addr)	/* new-style hostent structure */
	host.h_addr_list = host_addrs;
#endif
	host.h_addr = hostaddr;
	*((u_long *)host.h_addr) = inet_addr(p);
	host.h_length = sizeof (u_long);
	host.h_addrtype = AF_INET;
	while (*cp == ' ' || *cp == '\t')
		cp++;
	host.h_name = cp;
	q = host.h_aliases = host_aliases;
	cp = strpbrk(cp, " \t");
	if (cp != NULL) 
		*cp++ = '\0';
	while (cp && *cp) {
		if (*cp == ' ' || *cp == '\t') {
			cp++;
			continue;
		}
		if (q < &host_aliases[MAXALIASES - 1])
			*q++ = cp;
		cp = strpbrk(cp, " \t");
		if (cp != NULL)
			*cp++ = '\0';
	}
	*q = NULL;
	return (&host);
}

struct hostent *
_gethtbyname(name)
	char *name;
{
	register struct hostent *p;
	register char **cp;
	
	_sethtent(0);
	while (p = _gethtent()) {
		if (strcasecmp(p->h_name, name) == 0)
			break;
		for (cp = p->h_aliases; *cp != 0; cp++)
			if (strcasecmp(*cp, name) == 0)
				goto found;
	}
found:
	_endhtent();
	return (p);
}

struct hostent *
_gethtbyaddr(addr, len, type)
	const char *addr;
	int len, type;
{
	register struct hostent *p;

	_sethtent(0);
	while (p = _gethtent())
		if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
			break;
	_endhtent();
	return (p);
}
Commit	Line	Data
8ea4199d	1	/*
5cfeec12 KB	2	* Copyright (c) 1985, 1988 Regents of the University of California.
	3	* All rights reserved.
	4	*
269a7923	5	* %sccs.include.redist.c%
8ea4199d DF	6	*/
8ea4199d DF	7
2ce81398	8	#if defined(LIBC_SCCS) && !defined(lint)
dcdb79c9	9	static char sccsid[] = "@(#)gethostnamadr.c 6.45 (Berkeley) %G%";
5cfeec12	10	#endif /* LIBC_SCCS and not lint */
b423e985	11
7f2f8dda	12	#include <sys/param.h>
f784656b RC	13	#include <sys/socket.h>
f784656b RC	14	#include <netinet/in.h>
2795c575	15	#include <arpa/inet.h>
aa678832	16	#include <arpa/nameser.h>
24fac7d8	17	#include <netdb.h>
f94b2f50	18	#include <resolv.h>
24fac7d8	19	#include <stdio.h>
dcdb79c9	20	#include <ctype.h>
24fac7d8 KB	21	#include <errno.h>
24fac7d8 KB	22	#include <string.h>
337257b2 RC	23
337257b2 RC	24	#define MAXALIASES 35
0e9a6a67	25	#define MAXADDRS 35
337257b2	26
412fa3e3 JB	27	static char *h_addr_ptrs[MAXADDRS + 1];
	28
	29	static struct hostent host;
337257b2	30	static char *host_aliases[MAXALIASES];
291cd39e	31	static char hostbuf[BUFSIZ+1];
4682c40f	32	static struct in_addr host_addr;
12379d92	33	static FILE *hostf = NULL;
12379d92 KD	34	static char hostaddr[MAXADDRS];
	35	static char *host_addrs[2];
	36	static int stayopen = 0;
81f99a97	37	char *strpbrk();
3a87f357	38
b6a43c3e	39	#if PACKETSZ > 1024
0e9a6a67	40	#define MAXPACKET PACKETSZ
b6a43c3e	41	#else
0e9a6a67	42	#define MAXPACKET 1024
b6a43c3e MK	43	#endif
b6a43c3e MK	44
c675dcaa	45	typedef union {
0e9a6a67 KB	46	HEADER hdr;
0e9a6a67 KB	47	u_char buf[MAXPACKET];
c675dcaa KD	48	} querybuf;
c675dcaa KD	49
e714052f	50	typedef union {
c675dcaa KD	51	long al;
	52	char ac;
	53	} align;
	54
fe8457be KD	55	int h_errno;
fe8457be KD	56
337257b2	57	static struct hostent *
0e9a6a67 KB	58	getanswer(answer, anslen, iquery)
	59	querybuf *answer;
	60	int anslen;
	61	int iquery;
337257b2	62	{
f784656b	63	register HEADER *hp;
0e9a6a67	64	register u_char *cp;
f784656b	65	register int n;
0e9a6a67 KB	66	u_char *eom;
0e9a6a67 KB	67	char bp, *ap;
2795c575 KD	68	int type, class, buflen, ancount, qdcount;
2795c575 KD	69	int haveanswer, getclass = C_ANY;
412fa3e3	70	char **hap;
337257b2	71
0e9a6a67	72	eom = answer->buf + anslen;
f784656b RC	73	/*
	74	* find first satisfactory answer
	75	*/
0e9a6a67	76	hp = &answer->hdr;
f784656b	77	ancount = ntohs(hp->ancount);
4682c40f	78	qdcount = ntohs(hp->qdcount);
f784656b RC	79	bp = hostbuf;
f784656b RC	80	buflen = sizeof(hostbuf);
0e9a6a67	81	cp = answer->buf + sizeof(HEADER);
4682c40f	82	if (qdcount) {
f784656b	83	if (iquery) {
24fac7d8 KB	84	if ((n = dn_expand((u_char *)answer->buf,
	85	(u_char )eom, (u_char )cp, (u_char *)bp,
	86	buflen)) < 0) {
fe8457be	87	h_errno = NO_RECOVERY;
e0313454	88	return ((struct hostent *) NULL);
fe8457be	89	}
f784656b RC	90	cp += n + QFIXEDSZ;
	91	host.h_name = bp;
	92	n = strlen(bp) + 1;
	93	bp += n;
	94	buflen -= n;
	95	} else
371d3c9b	96	cp += __dn_skipname(cp, eom) + QFIXEDSZ;
4682c40f	97	while (--qdcount > 0)
371d3c9b	98	cp += __dn_skipname(cp, eom) + QFIXEDSZ;
fe8457be KD	99	} else if (iquery) {
	100	if (hp->aa)
	101	h_errno = HOST_NOT_FOUND;
	102	else
	103	h_errno = TRY_AGAIN;
e0313454	104	return ((struct hostent *) NULL);
fe8457be	105	}
412fa3e3	106	ap = host_aliases;
ee21fae8	107	*ap = NULL;
412fa3e3 JB	108	host.h_aliases = host_aliases;
412fa3e3 JB	109	hap = h_addr_ptrs;
ee21fae8	110	*hap = NULL;
15eda464	111	#if BSD >= 43 \|\| defined(h_addr) /* new-style hostent structure */
412fa3e3	112	host.h_addr_list = h_addr_ptrs;
da75bcd9	113	#endif
412fa3e3	114	haveanswer = 0;
f784656b	115	while (--ancount >= 0 && cp < eom) {
24fac7d8 KB	116	if ((n = dn_expand((u_char )answer->buf, (u_char )eom,
24fac7d8 KB	117	(u_char )cp, (u_char )bp, buflen)) < 0)
412fa3e3	118	break;
f784656b	119	cp += n;
b1772b2c	120	type = _getshort(cp);
f784656b	121	cp += sizeof(u_short);
b1772b2c	122	class = _getshort(cp);
f784656b	123	cp += sizeof(u_short) + sizeof(u_long);
b1772b2c	124	n = _getshort(cp);
f784656b RC	125	cp += sizeof(u_short);
	126	if (type == T_CNAME) {
	127	cp += n;
	128	if (ap >= &host_aliases[MAXALIASES-1])
	129	continue;
	130	*ap++ = bp;
	131	n = strlen(bp) + 1;
	132	bp += n;
	133	buflen -= n;
	134	continue;
	135	}
0e9a6a67	136	if (iquery && type == T_PTR) {
24fac7d8 KB	137	if ((n = dn_expand((u_char *)answer->buf,
	138	(u_char )eom, (u_char )cp, (u_char *)bp,
	139	buflen)) < 0) {
4682c40f JB	140	cp += n;
	141	continue;
	142	}
	143	cp += n;
	144	host.h_name = bp;
	145	return(&host);
	146	}
0e9a6a67	147	if (iquery \|\| type != T_A) {
d1c1ab68	148	#ifdef DEBUG
f784656b RC	149	if (_res.options & RES_DEBUG)
	150	printf("unexpected answer type %d, size %d\n",
	151	type, n);
d1c1ab68	152	#endif
412fa3e3	153	cp += n;
f784656b RC	154	continue;
f784656b RC	155	}
412fa3e3 JB	156	if (haveanswer) {
	157	if (n != host.h_length) {
	158	cp += n;
	159	continue;
	160	}
	161	if (class != getclass) {
	162	cp += n;
	163	continue;
	164	}
	165	} else {
	166	host.h_length = n;
	167	getclass = class;
82a65531	168	host.h_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC;
412fa3e3 JB	169	if (!iquery) {
	170	host.h_name = bp;
	171	bp += strlen(bp) + 1;
	172	}
f784656b	173	}
c675dcaa	174
8ad123ce	175	bp += sizeof(align) - ((u_long)bp % sizeof(align));
c675dcaa	176
f784656b	177	if (bp + n >= &hostbuf[sizeof(hostbuf)]) {
d1c1ab68	178	#ifdef DEBUG
f784656b RC	179	if (_res.options & RES_DEBUG)
f784656b RC	180	printf("size (%d) too big\n", n);
d1c1ab68	181	#endif
412fa3e3	182	break;
f784656b	183	}
412fa3e3 JB	184	bcopy(cp, *hap++ = bp, n);
	185	bp +=n;
	186	cp += n;
	187	haveanswer++;
f784656b	188	}
412fa3e3 JB	189	if (haveanswer) {
412fa3e3 JB	190	*ap = NULL;
15eda464	191	#if BSD >= 43 \|\| defined(h_addr) /* new-style hostent structure */
412fa3e3	192	*hap = NULL;
8ad123ce MK	193	#else
	194	host.h_addr = h_addr_ptrs[0];
	195	#endif
412fa3e3	196	return (&host);
fe8457be KD	197	} else {
fe8457be KD	198	h_errno = TRY_AGAIN;
e0313454	199	return ((struct hostent *) NULL);
fe8457be	200	}
337257b2 RC	201	}
	202
	203	struct hostent *
f784656b RC	204	gethostbyname(name)
f784656b RC	205	char *name;
337257b2	206	{
0e9a6a67 KB	207	querybuf buf;
0e9a6a67 KB	208	register char *cp;
f784656b	209	int n;
12379d92	210	extern struct hostent *_gethtbyname();
337257b2	211
693999f7 KB	212	/*
	213	* disallow names consisting only of digits/dots, unless
	214	* they end in a dot.
	215	*/
	216	if (isdigit(name[0]))
	217	for (cp = name;; ++cp) {
	218	if (!*cp) {
	219	if (*--cp == '.')
	220	break;
7468ba44 JB	221	/*
	222	* All-numeric, no dot at the end.
	223	* Fake up a hostent as if we'd actually
	224	* done a lookup. What if someone types
	225	* 255.255.255.255? The test below will
	226	* succeed spuriously... ???
	227	*/
	228	if ((host_addr.s_addr = inet_addr(name)) == -1) {
	229	h_errno = HOST_NOT_FOUND;
	230	return((struct hostent *) NULL);
	231	}
	232	host.h_name = name;
	233	host.h_aliases = host_aliases;
	234	host_aliases[0] = NULL;
	235	host.h_addrtype = AF_INET;
	236	host.h_length = sizeof(u_long);
	237	h_addr_ptrs[0] = (char *)&host_addr;
	238	h_addr_ptrs[1] = (char *)0;
	239	#if BSD >= 43 \|\| defined(h_addr) /* new-style hostent structure */
	240	host.h_addr_list = h_addr_ptrs;
	241	#else
	242	host.h_addr = h_addr_ptrs[0];
	243	#endif
	244	return (&host);
693999f7 KB	245	}
	246	if (!isdigit(cp) && cp != '.')
	247	break;
	248	}
216ea7e1	249
0e9a6a67	250	if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {
d1c1ab68	251	#ifdef DEBUG
f784656b	252	if (_res.options & RES_DEBUG)
0e9a6a67	253	printf("res_search failed\n");
d1c1ab68	254	#endif
0e9a6a67 KB	255	if (errno == ECONNREFUSED)
	256	return (_gethtbyname(name));
	257	else
	258	return ((struct hostent *) NULL);
3a87f357	259	}
0e9a6a67	260	return (getanswer(&buf, n, 0));
337257b2 RC	261	}
	262
	263	struct hostent *
f784656b	264	gethostbyaddr(addr, len, type)
24fac7d8	265	const char *addr;
f784656b	266	int len, type;
337257b2	267	{
f784656b	268	int n;
c675dcaa	269	querybuf buf;
4682c40f JB	270	register struct hostent *hp;
4682c40f JB	271	char qbuf[MAXDNAME];
12379d92 KD	272	extern struct hostent *_gethtbyaddr();
12379d92 KD	273
f784656b	274	if (type != AF_INET)
e0313454	275	return ((struct hostent *) NULL);
0d7830cc	276	(void)sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
fe8457be KD	277	((unsigned)addr[3] & 0xff),
	278	((unsigned)addr[2] & 0xff),
	279	((unsigned)addr[1] & 0xff),
	280	((unsigned)addr[0] & 0xff));
0e9a6a67	281	n = res_query(qbuf, C_IN, T_PTR, (char *)&buf, sizeof(buf));
f784656b	282	if (n < 0) {
d1c1ab68	283	#ifdef DEBUG
f784656b	284	if (_res.options & RES_DEBUG)
0e9a6a67	285	printf("res_query failed\n");
d1c1ab68	286	#endif
0e9a6a67	287	if (errno == ECONNREFUSED)
6d1927cd	288	return (_gethtbyaddr(addr, len, type));
e0313454	289	return ((struct hostent *) NULL);
f268b9fa	290	}
0e9a6a67	291	hp = getanswer(&buf, n, 1);
12379d92	292	if (hp == NULL)
e0313454	293	return ((struct hostent *) NULL);
4682c40f JB	294	hp->h_addrtype = type;
4682c40f JB	295	hp->h_length = len;
c7683dcd	296	h_addr_ptrs[0] = (char *)&host_addr;
4682c40f JB	297	h_addr_ptrs[1] = (char *)0;
4682c40f JB	298	host_addr = (struct in_addr )addr;
7468ba44 JB	299	#if BSD < 43 && !defined(h_addr) /* new-style hostent structure */
	300	hp->h_addr = h_addr_ptrs[0];
	301	#endif
4682c40f	302	return(hp);
337257b2	303	}
c675dcaa	304
12379d92 KD	305	_sethtent(f)
	306	int f;
	307	{
	308	if (hostf == NULL)
29eb0a7d	309	hostf = fopen(_PATH_HOSTS, "r" );
12379d92 KD	310	else
	311	rewind(hostf);
	312	stayopen \|= f;
	313	}
	314
	315	_endhtent()
	316	{
	317	if (hostf && !stayopen) {
2795c575	318	(void) fclose(hostf);
12379d92 KD	319	hostf = NULL;
	320	}
	321	}
	322
	323	struct hostent *
	324	_gethtent()
	325	{
	326	char *p;
	327	register char cp, *q;
	328
29eb0a7d	329	if (hostf == NULL && (hostf = fopen(_PATH_HOSTS, "r" )) == NULL)
12379d92 KD	330	return (NULL);
12379d92 KD	331	again:
0e9a6a67	332	if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL)
12379d92 KD	333	return (NULL);
	334	if (*p == '#')
	335	goto again;
81f99a97	336	cp = strpbrk(p, "#\n");
12379d92 KD	337	if (cp == NULL)
	338	goto again;
	339	*cp = '\0';
81f99a97	340	cp = strpbrk(p, " \t");
12379d92 KD	341	if (cp == NULL)
	342	goto again;
	343	*cp++ = '\0';
	344	/* THIS STUFF IS INTERNET SPECIFIC */
15eda464	345	#if BSD >= 43 \|\| defined(h_addr) /* new-style hostent structure */
12379d92	346	host.h_addr_list = host_addrs;
da75bcd9	347	#endif
12379d92 KD	348	host.h_addr = hostaddr;
	349	((u_long )host.h_addr) = inet_addr(p);
	350	host.h_length = sizeof (u_long);
	351	host.h_addrtype = AF_INET;
	352	while (cp == ' ' \|\| cp == '\t')
	353	cp++;
	354	host.h_name = cp;
	355	q = host.h_aliases = host_aliases;
81f99a97	356	cp = strpbrk(cp, " \t");
12379d92 KD	357	if (cp != NULL)
	358	*cp++ = '\0';
	359	while (cp && *cp) {
	360	if (cp == ' ' \|\| cp == '\t') {
	361	cp++;
	362	continue;
	363	}
	364	if (q < &host_aliases[MAXALIASES - 1])
	365	*q++ = cp;
81f99a97	366	cp = strpbrk(cp, " \t");
12379d92 KD	367	if (cp != NULL)
	368	*cp++ = '\0';
	369	}
	370	*q = NULL;
	371	return (&host);
	372	}
	373
12379d92 KD	374	struct hostent *
	375	_gethtbyname(name)
	376	char *name;
	377	{
	378	register struct hostent *p;
	379	register char **cp;
1e26987f	380
12379d92 KD	381	_sethtent(0);
12379d92 KD	382	while (p = _gethtent()) {
46d92023	383	if (strcasecmp(p->h_name, name) == 0)
12379d92 KD	384	break;
12379d92 KD	385	for (cp = p->h_aliases; *cp != 0; cp++)
46d92023	386	if (strcasecmp(*cp, name) == 0)
12379d92 KD	387	goto found;
	388	}
	389	found:
	390	_endhtent();
	391	return (p);
	392	}
	393
	394	struct hostent *
	395	_gethtbyaddr(addr, len, type)
24fac7d8	396	const char *addr;
12379d92 KD	397	int len, type;
	398	{
	399	register struct hostent *p;
	400
	401	_sethtent(0);
	402	while (p = _gethtent())
3f2cac51	403	if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
12379d92 KD	404	break;
	405	_endhtent();
	406	return (p);
	407	}