/*      $NetBSD: get_net.c,v 1.3 2020/04/23 00:22:01 joerg Exp $         */

/*
* Copyright (c) 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Herb Hasler and Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: get_net.c,v 1.3 2020/04/23 00:22:01 joerg Exp $");

#include <sys/types.h>
#include <netdb.h>
#include <stdio.h>
#include <limits.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <util.h>
#include <arpa/inet.h>
#include <netinet/in.h>

#include "mountd.h"

#ifdef TEST
int      opt_flags;
const int ninumeric = NI_NUMERICHOST;
int      mountd_debug = 1;
#endif

static int
isdottedquad(const char *cp)
{
       for (;;)
               switch (*cp++) {
               case '\0':
                       return 1;
               case '.':
               case '0': case '1': case '2': case '3': case '4':
               case '5': case '6': case '7': case '8': case '9':
                       continue;
               default:
                       return 0;
               }
}

static int
countones(struct sockaddr *sa)
{
       void *mask;
       int i, bits = 0, bytelen;
       u_int8_t *p;

       switch (sa->sa_family) {
       case AF_INET:
               mask = (u_int8_t *)&((struct sockaddr_in *)sa)->sin_addr;
               bytelen = 4;
               break;
       case AF_INET6:
               mask = (u_int8_t *)&((struct sockaddr_in6 *)sa)->sin6_addr;
               bytelen = 16;
               break;
       default:
               return 0;
       }

       p = mask;

       for (i = 0; i < bytelen; i++, p++) {
               if (*p != 0xff) {
                       for (bits = 0; bits < 8; bits++) {
                               if (!(*p & (1 << (7 - bits))))
                                       break;
                       }
                       break;
               }
       }

       return (i * 8 + bits);
}

/*
* Translate a net address.
*/
int
get_net(char *cp, struct netmsk *net, int maskflg)
{
       struct netent *np;
       char *nname, *p, *prefp;
       struct sockaddr_in sin, *sinp;
       struct sockaddr *sa;
       struct addrinfo hints, *ai = NULL;
       char netname[NI_MAXHOST];
       long preflen;
       int ecode;

       (void)memset(&sin, 0, sizeof(sin));
       if ((opt_flags & OP_MASKLEN) && !maskflg) {
               p = strchr(cp, '/');
               *p = '\0';
               prefp = p + 1;
       } else {
               p = NULL;       /* XXXGCC -Wuninitialized */
               prefp = NULL;   /* XXXGCC -Wuninitialized */
       }

       if ((np = getnetbyname(cp)) != NULL) {
               sin.sin_family = AF_INET;
               sin.sin_len = sizeof sin;
               sin.sin_addr = inet_makeaddr(np->n_net, 0);
               sa = (struct sockaddr *)&sin;
       } else if (isdottedquad(cp)) {
               /*
                * Handle dotted quad [or less than quad] notation specially
                * because getaddrinfo() will parse them in the old style:
                * i.e. 1.2.3 -> 1.2.0.3 not 1.2.3.0
                */
               sin.sin_family = AF_INET;
               sin.sin_len = sizeof sin;
               sin.sin_addr = inet_makeaddr(inet_network(cp), 0);
               if (mountd_debug)
                       fprintf(stderr, "get_net: '%s' v4 addr %x\n",
                           cp, sin.sin_addr.s_addr);
               sa = (struct sockaddr *)&sin;
       } else {
               memset(&hints, 0, sizeof hints);
               hints.ai_family = AF_UNSPEC;
               hints.ai_flags = AI_NUMERICHOST;
               if (getaddrinfo(cp, NULL, &hints, &ai) == 0)
                       sa = ai->ai_addr;
               else
                       goto fail;
       }

       /*
        * Disallow v6 addresses without a specific mask or masklen
        */
       if (sa->sa_family == AF_INET6 && (!(opt_flags & OP_MASKLEN) || maskflg))
               return 1;

       ecode = getnameinfo(sa, sa->sa_len, netname, sizeof netname,
           NULL, 0, ninumeric);
       if (ecode != 0)
               goto fail;

       if (maskflg)
               net->nt_len = countones(sa);
       else {
               if (opt_flags & OP_MASKLEN) {
                       errno = 0;
                       preflen = strtol(prefp, NULL, 10);
                       if (preflen == LONG_MIN && errno == ERANGE)
                               goto fail;
                       net->nt_len = (int)preflen;
                       *p = '/';
               }

               if (np)
                       nname = np->n_name;
               else {
                       if (getnameinfo(sa, sa->sa_len, netname, sizeof netname,
                           NULL, 0, ninumeric) != 0)
                               strlcpy(netname, "?", sizeof(netname));
                       nname = netname;
               }
               net->nt_name = estrdup(nname);
               memcpy(&net->nt_net, sa, sa->sa_len);
       }

       if (!maskflg && sa->sa_family == AF_INET &&
           !(opt_flags & (OP_MASK|OP_MASKLEN))) {
               sinp = (struct sockaddr_in *)sa;
               if (IN_CLASSA(sinp->sin_addr.s_addr))
                       net->nt_len = 8;
               else if (IN_CLASSB(sinp->sin_addr.s_addr))
                       net->nt_len = 16;
               else if (IN_CLASSC(sinp->sin_addr.s_addr))
                       net->nt_len = 24;
               else if (IN_CLASSD(sinp->sin_addr.s_addr))
                       net->nt_len = 28;
               else
                       net->nt_len = 32;       /* XXX */
       }

       if (ai)
               freeaddrinfo(ai);
       return 0;

fail:
       if (ai)
               freeaddrinfo(ai);
       return 1;
}

#ifdef TEST
int
main(int argc, char *argv[])
{
       char buf[1024];
       struct netmsk nm;

       if (get_net(argv[1], &nm, 0))
               errx(EXIT_FAILURE, "get_net failed");

       sockaddr_snprintf(buf, sizeof(buf), "%a:%p", (void *)&nm.nt_net);
       printf("%s %d %s\n", buf, nm.nt_len, nm.nt_name);
       return 0;
}
#endif

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