static int
gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped,
res_state statp)
{
char *p, *bp, *ep;
char *cp, **q;
int af, len;
char hostbuf[BUFSIZ + 1];
if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
again:
if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) {
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
return (-1);
}
if (*p == '#')
goto again;
cp = strpbrk(p, "#\n");
if (cp != NULL)
*cp = '\0';
if (!(cp = strpbrk(p, " \t")))
goto again;
*cp++ = '\0';
if (inet_pton(AF_INET6, p, hed->host_addr) > 0) {
af = AF_INET6;
len = IN6ADDRSZ;
} else if (inet_pton(AF_INET, p, hed->host_addr) > 0) {
if (mapped) {
_map_v4v6_address((char *)hed->host_addr,
(char *)hed->host_addr);
af = AF_INET6;
len = IN6ADDRSZ;
} else {
af = AF_INET;
len = INADDRSZ;
}
} else {
goto again;
}
hed->h_addr_ptrs[0] = (char *)hed->host_addr;
hed->h_addr_ptrs[1] = NULL;
he->h_addr_list = hed->h_addr_ptrs;
he->h_length = len;
he->h_addrtype = af;
while (*cp == ' ' || *cp == '\t')
cp++;
bp = hed->hostbuf;
ep = hed->hostbuf + sizeof hed->hostbuf;
he->h_name = bp;
q = he->h_aliases = hed->host_aliases;
if ((p = strpbrk(cp, " \t")) != NULL)
*p++ = '\0';
len = strlen(cp) + 1;
if (ep - bp < len) {
RES_SET_H_ERRNO(statp, NO_RECOVERY);
return (-1);
}
strlcpy(bp, cp, ep - bp);
bp += len;
cp = p;
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q >= &hed->host_aliases[_MAXALIASES - 1])
break;
if ((p = strpbrk(cp, " \t")) != NULL)
*p++ = '\0';
len = strlen(cp) + 1;
if (ep - bp < len)
break;
strlcpy(bp, cp, ep - bp);
*q++ = bp;
bp += len;
cp = p;
}
*q = NULL;
RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
return (0);
}
static int
_gethostbynis(const char *name, char *map, int af, struct hostent *he,
struct hostent_data *hed)
{
char *p, *bp, *ep;
char *cp, **q;
char *result;
int resultlen, size, addrok = 0;
char ypbuf[YPMAXRECORD + 2];
res_state statp;
statp = __res_state();
switch(af) {
case AF_INET:
size = NS_INADDRSZ;
break;
case AF_INET6:
size = NS_IN6ADDRSZ;
break;
default:
errno = EAFNOSUPPORT;
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
if (hed->yp_domain == (char *)NULL)
if (yp_get_default_domain (&hed->yp_domain)) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
if (yp_match(hed->yp_domain, map, name, strlen(name), &result,
&resultlen)) {
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
return (-1);
}
/* avoid potential memory leak */
bcopy((char *)result, (char *)&ypbuf, resultlen);
ypbuf[resultlen] = '\0';
free(result);
result = (char *)&ypbuf;
if ((cp = index(result, '\n')))
*cp = '\0';
cp = strpbrk(result, " \t");
*cp++ = '\0';
he->h_addr_list = hed->h_addr_ptrs;
he->h_addr = (char *)hed->host_addr;
switch (af) {
case AF_INET:
addrok = inet_aton(result, (struct in_addr *)hed->host_addr);
if (addrok != 1)
break;
if (statp->options & RES_USE_INET6) {
_map_v4v6_address((char *)hed->host_addr,
(char *)hed->host_addr);
af = AF_INET6;
size = NS_IN6ADDRSZ;
}
break;
case AF_INET6:
addrok = inet_pton(af, result, hed->host_addr);
break;
}
if (addrok != 1) {
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
return (-1);
}
he->h_addr_list[1] = NULL;
he->h_length = size;
he->h_addrtype = af;
while (*cp == ' ' || *cp == '\t')
cp++;
bp = hed->hostbuf;
ep = hed->hostbuf + sizeof hed->hostbuf;
he->h_name = bp;
q = he->h_aliases = hed->host_aliases;
p = strpbrk(cp, " \t");
if (p != NULL)
*p++ = '\0';
size = strlen(cp) + 1;
if (ep - bp < size) {
RES_SET_H_ERRNO(statp, NO_RECOVERY);
return (-1);
}
strlcpy(bp, cp, ep - bp);
bp += size;
cp = p;
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q >= &hed->host_aliases[_MAXALIASES - 1])
break;
p = strpbrk(cp, " \t");
if (p != NULL)
*p++ = '\0';
size = strlen(cp) + 1;
if (ep - bp < size)
break;
strlcpy(bp, cp, ep - bp);
*q++ = bp;
bp += size;
cp = p;
}
*q = NULL;
return (0);
}
int
_ht_gethostbyname(void *rval, void *cb_data, va_list ap)
{
const char *name;
int af;
char *buffer;
size_t buflen;
int *errnop, *h_errnop;
struct hostent *hptr, he;
struct hostent_data *hed;
char **cp;
res_state statp;
int error;
name = va_arg(ap, const char *);
af = va_arg(ap, int);
hptr = va_arg(ap, struct hostent *);
buffer = va_arg(ap, char *);
buflen = va_arg(ap, size_t);
errnop = va_arg(ap, int *);
h_errnop = va_arg(ap, int *);
*((struct hostent **)rval) = NULL;
statp = __res_state();
if ((hed = __hostent_data_init()) == NULL) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
*h_errnop = statp->res_h_errno;
return (NS_NOTFOUND);
}
_sethosthtent(0, hed);
while ((error = gethostent_p(&he, hed, 0, statp)) == 0) {
if (he.h_addrtype != af)
continue;
if (he.h_addrtype == AF_INET &&
statp->options & RES_USE_INET6) {
_map_v4v6_address(he.h_addr, he.h_addr);
he.h_length = IN6ADDRSZ;
he.h_addrtype = AF_INET6;
}
if (strcasecmp(he.h_name, name) == 0)
break;
for (cp = he.h_aliases; *cp != 0; cp++)
if (strcasecmp(*cp, name) == 0)
goto found;
}
found:
_endhosthtent(hed);
if (error != 0) {
*h_errnop = statp->res_h_errno;
return (NS_NOTFOUND);
}
if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
*errnop = errno;
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
*h_errnop = statp->res_h_errno;
return (NS_RETURN);
}
*((struct hostent **)rval) = hptr;
return (NS_SUCCESS);
}