libsmbfs/smb/getaddr.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * Functions to get list of addresses (TCP and/or NetBIOS)
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <netdb.h>
#include <libintl.h>
#include <xti.h>
#include <assert.h>

#include <sys/types.h>
#include <sys/time.h>
#include <sys/byteorder.h>
#include <sys/socket.h>
#include <sys/fcntl.h>

#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>

#include <netsmb/smb.h>
#include <netsmb/smb_lib.h>
#include <netsmb/netbios.h>
#include <netsmb/nb_lib.h>
#include <netsmb/smb_dev.h>

#include "charsets.h"
#include "private.h"

void
dump_addrinfo(struct addrinfo *ai)
{
    int i;

    if (ai == NULL) {
        printf("ai==NULL\n");
        return;
    }

    for (i = 0; ai; i++, ai = ai->ai_next) {
        printf("ai[%d]: af=%d, len=%d", i,
            ai->ai_family, ai->ai_addrlen);
        dump_sockaddr(ai->ai_addr);
        if (ai->ai_canonname) {
            printf("ai[%d]: cname=\"%s\"\n",
                i, ai->ai_canonname);
        }
    }
}

void
dump_sockaddr(struct sockaddr *sa)
{
    char paddrbuf[INET6_ADDRSTRLEN];
    struct sockaddr_in *sin;
    struct sockaddr_in6 *sin6;
    int af = sa->sa_family;
    const char *ip;

    printf(" saf=%d,", af);
    switch (af) {
    case AF_NETBIOS: /* see nbns_rq.c */
    case AF_INET:
        sin = (void *)sa;
        ip = inet_ntop(AF_INET, &sin->sin_addr,
            paddrbuf, sizeof (paddrbuf));
        break;
    case AF_INET6:
        sin6 = (void *)sa;
        ip = inet_ntop(AF_INET6, &sin6->sin6_addr,
            paddrbuf, sizeof (paddrbuf));
        break;
    default:
        ip = "?";
        break;
    }
    printf(" IP=%s\n", ip);
}


/*
 * SMB client name resolution - normal, and/or NetBIOS.
 * Returns an EAI_xxx error number like getaddrinfo(3)
 */
int
smb_ctx_getaddr(struct smb_ctx *ctx)
{
    struct nb_ctx   *nbc = ctx->ct_nb;
    struct addrinfo hints, *res;
    char *srvaddr_str;
    int gaierr, gaierr2;

    if (ctx->ct_fullserver == NULL || ctx->ct_fullserver[0] == '\0')
        return (EAI_NONAME);

    if (ctx->ct_addrinfo != NULL) {
        freeaddrinfo(ctx->ct_addrinfo);
        ctx->ct_addrinfo = NULL;
    }

    /*
     * If the user specified an address, use it,
     * and don't do NetBIOS lookup.
     */
    if (ctx->ct_srvaddr_s) {
        srvaddr_str = ctx->ct_srvaddr_s;
        nbc->nb_flags &= ~NBCF_NS_ENABLE;
    } else
        srvaddr_str = ctx->ct_fullserver;

    /*
     * Default the server name we'll use in the
     * protocol (i.e. NTLM, tree connect).
     */
    strlcpy(ctx->ct_srvname, ctx->ct_fullserver,
        sizeof (ctx->ct_srvname));

    /*
     * Try to lookup the host address using the
     * normal name-to-IP address mechanisms.
     * If that fails, we MAY try NetBIOS.
     */
    memset(&hints, 0, sizeof (hints));
    hints.ai_flags = AI_CANONNAME;
    hints.ai_family = PF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    gaierr = getaddrinfo(srvaddr_str, NULL, &hints, &res);
    if (gaierr == 0) {
        ctx->ct_addrinfo = res;
        return (0);
    }

    /*
     * If regular IP name lookup failed, try NetBIOS,
     * but only if given a valid NetBIOS name and if
     * NetBIOS name lookup is enabled.
     */
    if (nbc->nb_flags & NBCF_NS_ENABLE) {
        gaierr2 = nbns_getaddrinfo(ctx->ct_fullserver, nbc, &res);
        if (gaierr2 == 0) {
            if (res->ai_canonname)
                strlcpy(ctx->ct_srvname,
                    res->ai_canonname,
                    sizeof (ctx->ct_srvname));
            ctx->ct_addrinfo = res;
            return (0);
        }
    }

    /*
     * Return the original error from getaddrinfo
     */
    if (smb_verbose) {
        smb_error(dgettext(TEXT_DOMAIN,
            "getaddrinfo: %s: %s"), 0,
            ctx->ct_fullserver,
            gai_strerror(gaierr));
    }
    return (gaierr);
}