source: MondoRescue/trunk/mindi-busybox/libbb/inet_common.c@ 954

/*
 * 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"
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef DEBUG
# include <resolv.h>
#endif


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;
#if 0
    INET_nn = NULL;
#endif
    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 = bb_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 */