busybox/libbb/inet_common.c
Rob Landley d921b2ecc0 Remove bb_ prefixes from xfuncs.c (and a few other places), consolidate
things like xasprintf() into xfuncs.c, remove xprint_file_by_name() (it only
had one user), clean up lots of #includes...  General cleanup pass.  What I've
been doing for the last couple days.

And it conflicts!  I've removed httpd.c from this checkin due to somebody else
touching that file.  It builds for me.  I have to catch a bus.  (Now you know
why I'm looking forward to Mercurial.)
2006-08-03 15:41:12 +00:00

236 lines
5.2 KiB
C

/* 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
*
* Version: $Id: inet_common.c,v 1.8 2004/03/10 07:42:38 mjn3 Exp $
*
*/
#include "libbb.h"
#include "inet_common.h"
const char bb_INET_default[] = "default";
int INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
{
struct hostent *hp;
struct netent *np;
/* Grmpf. -FvK */
s_in->sin_family = AF_INET;
s_in->sin_port = 0;
/* Default is special, meaning 0.0.0.0. */
if (!strcmp(name, bb_INET_default)) {
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 */
#ifdef DEBUG
if (hostfirst) {
bb_error_msg("gethostbyname (%s)", name);
}
#endif
if (hostfirst && (hp = gethostbyname(name)) != (struct hostent *) NULL) {
memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
sizeof(struct in_addr));
return 0;
}
/* Try the NETWORKS database to see if this is a known network. */
#ifdef DEBUG
bb_error_msg("getnetbyname (%s)", name);
#endif
if ((np = getnetbyname(name)) != (struct netent *) NULL) {
s_in->sin_addr.s_addr = htonl(np->n_net);
return 1;
}
if (hostfirst) {
/* Don't try again */
return -1;
}
#ifdef DEBUG
res_init();
_res.options |= RES_DEBUG;
#endif
#ifdef DEBUG
bb_error_msg("gethostbyname (%s)", name);
#endif
if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
return -1;
}
memcpy((char *) &s_in->sin_addr, (char *) hp->h_addr_list[0],
sizeof(struct in_addr));
return 0;
}
/* cache */
struct addr {
struct sockaddr_in addr;
char *name;
int host;
struct addr *next;
};
static struct addr *INET_nn = NULL; /* addr-to-name cache */
/* numeric: & 0x8000: default instead of *,
* & 0x4000: host instead of net,
* & 0x0fff: don't resolve
*/
int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in,
int numeric, unsigned int netmask)
{
struct hostent *ent;
struct netent *np;
struct addr *pn;
unsigned long ad, host_ad;
int host = 0;
/* Grmpf. -FvK */
if (s_in->sin_family != AF_INET) {
#ifdef DEBUG
bb_error_msg("rresolve: unsupport address family %d !",
s_in->sin_family);
#endif
errno = EAFNOSUPPORT;
return (-1);
}
ad = (unsigned long) s_in->sin_addr.s_addr;
#ifdef DEBUG
bb_error_msg("rresolve: %08lx, mask %08x, num %08x", ad, netmask, numeric);
#endif
if (ad == INADDR_ANY) {
if ((numeric & 0x0FFF) == 0) {
if (numeric & 0x8000)
safe_strncpy(name, bb_INET_default, len);
else
safe_strncpy(name, "*", len);
return (0);
}
}
if (numeric & 0x0FFF) {
safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
return (0);
}
if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
host = 1;
pn = INET_nn;
while (pn != NULL) {
if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
safe_strncpy(name, pn->name, len);
#ifdef DEBUG
bb_error_msg("rresolve: found %s %08lx in cache",
(host ? "host" : "net"), ad);
#endif
return (0);
}
pn = pn->next;
}
host_ad = ntohl(ad);
np = NULL;
ent = NULL;
if (host) {
#ifdef DEBUG
bb_error_msg("gethostbyaddr (%08lx)", ad);
#endif
ent = gethostbyaddr((char *) &ad, 4, AF_INET);
if (ent != NULL) {
safe_strncpy(name, ent->h_name, len);
}
} else {
#ifdef DEBUG
bb_error_msg("getnetbyaddr (%08lx)", host_ad);
#endif
np = getnetbyaddr(host_ad, AF_INET);
if (np != NULL) {
safe_strncpy(name, np->n_name, len);
}
}
if ((ent == NULL) && (np == NULL)) {
safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
}
pn = (struct addr *) xmalloc(sizeof(struct addr));
pn->addr = *s_in;
pn->next = INET_nn;
pn->host = host;
pn->name = xstrdup(name);
INET_nn = pn;
return (0);
}
#ifdef CONFIG_FEATURE_IPV6
int INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
{
struct addrinfo req, *ai;
int s;
memset(&req, '\0', sizeof req);
req.ai_family = AF_INET6;
if ((s = getaddrinfo(name, NULL, &req, &ai))) {
bb_error_msg("getaddrinfo: %s: %d", name, s);
return -1;
}
memcpy(sin6, ai->ai_addr, sizeof(struct sockaddr_in6));
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
int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
int numeric)
{
int s;
/* Grmpf. -FvK */
if (sin6->sin6_family != AF_INET6) {
#ifdef DEBUG
bb_error_msg(_("rresolve: unsupport address family %d !\n"),
sin6->sin6_family);
#endif
errno = EAFNOSUPPORT;
return (-1);
}
if (numeric & 0x7FFF) {
inet_ntop(AF_INET6, &sin6->sin6_addr, name, len);
return (0);
}
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (numeric & 0x8000) {
strcpy(name, "default");
} else {
strcpy(name, "*");
}
return (0);
}
s = getnameinfo((struct sockaddr *) sin6, sizeof(struct sockaddr_in6), name, len, NULL, 0, 0);
if (s) {
bb_error_msg("getnameinfo failed");
return -1;
}
return (0);
}
#endif /* CONFIG_FEATURE_IPV6 */