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225 lines
5.0 KiB
C
225 lines
5.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* stolen from net-tools-1.59 and stripped down for busybox by
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* Erik Andersen <andersen@codepoet.org>
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*
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* Heavily modified by Manuel Novoa III Mar 12, 2001
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include "inet_common.h"
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int FAST_FUNC INET_resolve(const char *name, struct sockaddr_in *s_in, int hostfirst)
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{
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struct hostent *hp;
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#if ENABLE_FEATURE_ETC_NETWORKS
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struct netent *np;
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#endif
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/* Grmpf. -FvK */
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s_in->sin_family = AF_INET;
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s_in->sin_port = 0;
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/* Default is special, meaning 0.0.0.0. */
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if (strcmp(name, "default") == 0) {
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s_in->sin_addr.s_addr = INADDR_ANY;
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return 1;
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}
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/* Look to see if it's a dotted quad. */
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if (inet_aton(name, &s_in->sin_addr)) {
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return 0;
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}
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/* If we expect this to be a hostname, try hostname database first */
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#ifdef DEBUG
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if (hostfirst) {
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bb_error_msg("gethostbyname(%s)", name);
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}
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#endif
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if (hostfirst) {
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hp = gethostbyname(name);
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if (hp != NULL) {
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memcpy(&s_in->sin_addr, hp->h_addr_list[0],
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sizeof(struct in_addr));
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return 0;
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}
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}
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#if ENABLE_FEATURE_ETC_NETWORKS
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/* Try the NETWORKS database to see if this is a known network. */
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#ifdef DEBUG
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bb_error_msg("getnetbyname(%s)", name);
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#endif
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np = getnetbyname(name);
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if (np != NULL) {
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s_in->sin_addr.s_addr = htonl(np->n_net);
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return 1;
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}
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#endif
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if (hostfirst) {
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/* Don't try again */
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return -1;
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}
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#ifdef DEBUG
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res_init();
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_res.options |= RES_DEBUG;
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bb_error_msg("gethostbyname(%s)", name);
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#endif
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hp = gethostbyname(name);
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if (hp == NULL) {
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return -1;
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}
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memcpy(&s_in->sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
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return 0;
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}
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/* numeric: & 0x8000: default instead of *,
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* & 0x4000: host instead of net,
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* & 0x0fff: don't resolve
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*/
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char* FAST_FUNC INET_rresolve(struct sockaddr_in *s_in, int numeric, uint32_t netmask)
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{
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/* addr-to-name cache */
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struct addr {
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struct addr *next;
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struct sockaddr_in addr;
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int host;
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char name[1];
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};
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static struct addr *cache = NULL;
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struct addr *pn;
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char *name;
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uint32_t ad, host_ad;
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int host = 0;
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if (s_in->sin_family != AF_INET) {
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#ifdef DEBUG
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bb_error_msg("rresolve: unsupported address family %d!",
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s_in->sin_family);
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#endif
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errno = EAFNOSUPPORT;
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return NULL;
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}
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ad = s_in->sin_addr.s_addr;
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#ifdef DEBUG
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bb_error_msg("rresolve: %08x, mask %08x, num %08x", (unsigned)ad, netmask, numeric);
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#endif
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if (ad == INADDR_ANY) {
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if ((numeric & 0x0FFF) == 0) {
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if (numeric & 0x8000)
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return xstrdup("default");
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return xstrdup("*");
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}
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}
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if (numeric & 0x0FFF)
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return xstrdup(inet_ntoa(s_in->sin_addr));
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if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
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host = 1;
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pn = cache;
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while (pn) {
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if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
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#ifdef DEBUG
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bb_error_msg("rresolve: found %s %08x in cache",
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(host ? "host" : "net"), (unsigned)ad);
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#endif
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return xstrdup(pn->name);
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}
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pn = pn->next;
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}
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host_ad = ntohl(ad);
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name = NULL;
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if (host) {
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struct hostent *ent;
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#ifdef DEBUG
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bb_error_msg("gethostbyaddr (%08x)", (unsigned)ad);
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#endif
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ent = gethostbyaddr((char *) &ad, 4, AF_INET);
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if (ent)
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name = xstrdup(ent->h_name);
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} else if (ENABLE_FEATURE_ETC_NETWORKS) {
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struct netent *np;
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#ifdef DEBUG
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bb_error_msg("getnetbyaddr (%08x)", (unsigned)host_ad);
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#endif
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np = getnetbyaddr(host_ad, AF_INET);
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if (np)
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name = xstrdup(np->n_name);
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}
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if (!name)
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name = xstrdup(inet_ntoa(s_in->sin_addr));
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pn = xmalloc(sizeof(*pn) + strlen(name)); /* no '+ 1', it's already accounted for */
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pn->next = cache;
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pn->addr = *s_in;
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pn->host = host;
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strcpy(pn->name, name);
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cache = pn;
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return name;
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}
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#if ENABLE_FEATURE_IPV6
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int FAST_FUNC INET6_resolve(const char *name, struct sockaddr_in6 *sin6)
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{
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struct addrinfo req, *ai = NULL;
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int s;
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memset(&req, 0, sizeof(req));
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req.ai_family = AF_INET6;
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s = getaddrinfo(name, NULL, &req, &ai);
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if (s != 0) {
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bb_error_msg("getaddrinfo: %s: %d", name, s);
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return -1;
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}
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memcpy(sin6, ai->ai_addr, sizeof(*sin6));
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if (ai)
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freeaddrinfo(ai);
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return 0;
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}
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#ifndef IN6_IS_ADDR_UNSPECIFIED
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# define IN6_IS_ADDR_UNSPECIFIED(a) \
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(((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
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((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
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#endif
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char* FAST_FUNC INET6_rresolve(struct sockaddr_in6 *sin6, int numeric)
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{
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char name[128];
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int s;
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if (sin6->sin6_family != AF_INET6) {
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#ifdef DEBUG
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bb_error_msg("rresolve: unsupported address family %d!",
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sin6->sin6_family);
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#endif
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errno = EAFNOSUPPORT;
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return NULL;
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}
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if (numeric & 0x7FFF) {
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inet_ntop(AF_INET6, &sin6->sin6_addr, name, sizeof(name));
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return xstrdup(name);
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}
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if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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if (numeric & 0x8000)
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return xstrdup("default");
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return xstrdup("*");
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}
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s = getnameinfo((struct sockaddr *) sin6, sizeof(*sin6),
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name, sizeof(name),
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/*serv,servlen:*/ NULL, 0,
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0);
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if (s != 0) {
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bb_error_msg("getnameinfo failed");
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return NULL;
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}
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return xstrdup(name);
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}
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#endif /* CONFIG_FEATURE_IPV6 */
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