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As discussed on "tech-net@netbsd.org": 

Enhance the file resolver to return all IP addresses of a host on a
call to gethostbyname().
This commit is contained in:
tron 1999-06-02 22:14:07 +00:00
parent 1790023ce8
commit 23b3336739
1 changed files with 74 additions and 12 deletions
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86
lib/libc/net/gethnamaddr.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: gethnamaddr.c,v 1.17 1999/05/04 13:51:39 christos Exp $ */
/* $NetBSD: gethnamaddr.c,v 1.18 1999/06/02 22:14:07 tron Exp $ */
/*
* ++Copyright++ 1985, 1988, 1993
@ -61,7 +61,7 @@
static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
static char rcsid[] = "Id: gethnamaddr.c,v 8.21 1997/06/01 20:34:37 vixie Exp ";
#else
__RCSID("$NetBSD: gethnamaddr.c,v 1.17 1999/05/04 13:51:39 christos Exp $");
__RCSID("$NetBSD: gethnamaddr.c,v 1.18 1999/06/02 22:14:07 tron Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@ -791,21 +791,83 @@ _gethtbyname2(name, af)
int af;
{
register struct hostent *p;
register char **cp;
register char *tmpbuf, *ptr, **cp;
register int num;
register size_t len;
_sethtent(0);
while ((p = _gethtent()) != NULL) {
ptr = tmpbuf = NULL;
num = 0;
while ((p = _gethtent()) != NULL && num < MAXADDRS) {
if (p->h_addrtype != af)
continue;
if (strcasecmp(p->h_name, name) == 0)
break;
for (cp = p->h_aliases; *cp != 0; cp++)
if (strcasecmp(*cp, name) == 0)
goto found;
if (strcasecmp(p->h_name, name) != 0) {
for (cp = p->h_aliases; *cp != NULL; cp++)
if (strcasecmp(*cp, name) == 0)
break;
if (*cp == NULL) continue;
}
if (num == 0) {
register size_t bufsize;
register char *src;
bufsize = strlen(p->h_name) + 2 +
MAXADDRS * p->h_length;
for (cp = p->h_aliases; *cp != NULL; cp++)
bufsize += strlen(*cp) + 1;
if ((tmpbuf = malloc(bufsize)) == NULL) {
h_errno = NETDB_INTERNAL;
return NULL;
}
ptr = tmpbuf;
src = p->h_name;
while ((*ptr++ = *src++) != '\0');
for (cp = p->h_aliases; *cp != NULL; cp++) {
src = *cp;
while ((*ptr++ = *src++) != '\0');
}
*ptr++ = '\0';
}
(void)memcpy(ptr, p->h_addr_list[0], (size_t)p->h_length);
ptr += p->h_length;
num++;
}
found:
_endhtent();
return (p);
if (num == 0) return NULL;
len = ptr - tmpbuf;
if (len > sizeof(hostbuf)) {
free(tmpbuf);
errno = ENOSPC;
h_errno = NETDB_INTERNAL;
return NULL;
}
ptr = memcpy(hostbuf, tmpbuf, len);
free(tmpbuf);
host.h_name = ptr;
while (*ptr++);
cp = host_aliases;
while (*ptr) {
*cp++ = ptr;
while (*ptr++);
}
ptr++;
*cp = NULL;
cp = h_addr_ptrs;
while (num--) {
*cp++ = ptr;
ptr += host.h_length;
}
*cp = NULL;
return (&host);
}
/*ARGSUSED*/