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/* vi: set sw=4 ts=4: */
/*
* stolen from net-tools-1.59 and stripped down for busybox by
* Erik Andersen <andersen@codepoet.org>
*
* Heavily modified by Manuel Novoa III Mar 12, 2001
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include "inet_common.h"
#if 0
# define dbg(...) bb_error_msg(__VA_ARGS__)
#else
# define dbg(...) ((void)0)
#endif
int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
{
struct hostent *hp;
#if ENABLE_FEATURE_ETC_NETWORKS
struct netent *np;
#endif
/* Grmpf. -FvK */
s_in->sin_family = AF_INET;
s_in->sin_port = 0;
/* Default is special, meaning 0.0.0.0. */
if (strcmp(name, "default") == 0) {
s_in->sin_addr.s_addr = INADDR_ANY;
return 1;
}
/* Look to see if it's a dotted quad. */
if (inet_aton(name, &s_in->sin_addr)) {
return 0;
}
/* If we expect this to be a hostname, try hostname database first */
if (hostfirst) {
dbg("gethostbyname(%s)", name);
hp = gethostbyname(name);
if (hp) {
memcpy(&s_in->sin_addr, hp->h_addr_list[0],
sizeof(struct in_addr));
return 0;
}
}
#if ENABLE_FEATURE_ETC_NETWORKS
/* Try the NETWORKS database to see if this is a known network. */
dbg("getnetbyname(%s)", name);
np = getnetbyname(name);
if (np) {
s_in->sin_addr.s_addr = htonl(np->n_net);
return 1;
}
#endif
if (hostfirst) {
/* Don't try again */
return -1;
}
#ifdef DEBUG
res_init();
_res.options |= RES_DEBUG;
#endif
dbg("gethostbyname(%s)", name);
hp = gethostbyname(name);
if (!hp) {
return -1;
}
memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
return 0;
}
/* numeric: & 0x8000: "default" instead of "*",
* & 0x4000: host instead of net,
* & 0x0fff: don't resolve
*/
char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
{
/* addr-to-name cache */
struct addr {
struct addr *next;
uint32_t nip;
smallint is_host;
char name[1];
};
static struct addr *cache = NULL;
struct addr *pn;
char *name;
uint32_t nip;
smallint is_host;
if (s_in->sin_family != AF_INET) {
dbg("rresolve: unsupported address family %d!", s_in->sin_family);
errno = EAFNOSUPPORT;
return NULL;
}
nip = s_in->sin_addr.s_addr;
dbg("rresolve: %08x mask:%08x num:%08x", (unsigned)nip, netmask, numeric);
if (numeric & 0x0FFF)
return xmalloc_sockaddr2dotted_noport((void*)s_in);
if (nip == INADDR_ANY) {
if (numeric & 0x8000)
return xstrdup("default");
return xstrdup("*");
}
is_host = ((nip & (~netmask)) != 0 || (numeric & 0x4000));
pn = cache;
while (pn) {
if (pn->nip == nip && pn->is_host == is_host) {
dbg("rresolve: found %s %08x in cache",
(is_host ? "host" : "net"), (unsigned)nip);
return xstrdup(pn->name);
}
pn = pn->next;
}
name = NULL;
if (is_host) {
dbg("sockaddr2host_noport(%08x)", (unsigned)nip);
name = xmalloc_sockaddr2host_noport((void*)s_in);
}
#if ENABLE_FEATURE_ETC_NETWORKS
else {
struct netent *np;
dbg("getnetbyaddr(%08x)", (unsigned)ntohl(nip));
np = getnetbyaddr(ntohl(nip), AF_INET);
if (np)
name = xstrdup(np->n_name);
}
#endif
if (!name)
name = xmalloc_sockaddr2dotted_noport((void*)s_in);
pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
pn->next = cache;
pn->nip = nip;
pn->is_host = is_host;
strcpy(pn->name, name);
cache = pn;
return name;
}
#if ENABLE_FEATURE_IPV6
int FAST_FUNC INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
{
struct addrinfo req, *ai = NULL;
int s;
memset(&req, 0, sizeof(req));
req.ai_family = AF_INET6;
s = getaddrinfo(name, NULL, &req, &ai);
if (s != 0) {
bb_error_msg("getaddrinfo: %s: %d", name, s);
return -1;
}
memcpy(sin6, ai->ai_addr, sizeof(*sin6));
freeaddrinfo(ai);
return 0;
}
#ifndef IN6_IS_ADDR_UNSPECIFIED
# define IN6_IS_ADDR_UNSPECIFIED(a) \
(((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
#endif
char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
{
if (sin6->sin6_family != AF_INET6) {
dbg("rresolve: unsupported address family %d!",
sin6->sin6_family);
errno = EAFNOSUPPORT;
return NULL;
}
if (numeric & 0x7FFF) {
return xmalloc_sockaddr2dotted_noport((void*)sin6);
}
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (numeric & 0x8000)
return xstrdup("default");
return xstrdup("*");
}
return xmalloc_sockaddr2host_noport((void*)sin6);
}
#endif /* CONFIG_FEATURE_IPV6 */
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