external/bsd/libbind/dist/irs/util.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (c) 1996,1999 by Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  17  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #if defined(LIBC_SCCS) && !defined(lint)
  21 static const char rcsid[] = "Id: util.c,v 1.3 2005/04/27 04:56:34 sra Exp";
  22 #endif
  23
  24 #include "port_before.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/nameser.h>
  30 #include <resolv.h>
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <stdlib.h>
  37
  38 #include <irs.h>
  39
  40 #include "port_after.h"
  41
  42 #include "irs_p.h"
  43
  44 #ifdef SPRINTF_CHAR
  45 # define SPRINTF(x) strlen(sprintf/**/x)
  46 #else
  47 # define SPRINTF(x) sprintf x
  48 #endif
  49
  50 void
  51 map_v4v6_address(const char *src, char *dst) {
  52         u_char *p = (u_char *)dst;
  53         char tmp[NS_INADDRSZ];
  54         int i;
  55
  56         /* Stash a temporary copy so our caller can update in place. */
  57         memcpy(tmp, src, NS_INADDRSZ);
  58         /* Mark this ipv6 addr as a mapped ipv4. */
  59         for (i = 0; i < 10; i++)
  60                 *p++ = 0x00;
  61         *p++ = 0xff;
  62         *p++ = 0xff;
  63         /* Retrieve the saved copy and we're done. */
  64         memcpy((void*)p, tmp, NS_INADDRSZ);
  65 }
  66
  67 int
  68 make_group_list(struct irs_gr *this, const char *name,
  69         gid_t basegid, gid_t *groups, int *ngroups)
  70 {
  71         struct group *grp;
  72         int i, ng;
  73         int ret, maxgroups;
  74
  75         ret = -1;
  76         ng = 0;
  77         maxgroups = *ngroups;
  78         /*
  79          * When installing primary group, duplicate it;
  80          * the first element of groups is the effective gid
  81          * and will be overwritten when a setgid file is executed.
  82          */
  83         if (ng >= maxgroups)
  84                 goto done;
  85         groups[ng++] = basegid;
  86         if (ng >= maxgroups)
  87                 goto done;
  88         groups[ng++] = basegid;
  89         /*
  90          * Scan the group file to find additional groups.
  91          */
  92         (*this->rewind)(this);
  93         while ((grp = (*this->next)(this)) != NULL) {
  94                 if ((gid_t)grp->gr_gid == basegid)
  95                         continue;
  96                 for (i = 0; grp->gr_mem[i]; i++) {
  97                         if (!strcmp(grp->gr_mem[i], name)) {
  98                                 if (ng >= maxgroups)
  99                                         goto done;
 100                                 groups[ng++] = grp->gr_gid;
 101                                 break;
 102                         }
 103                 }
 104         }
 105         ret = 0;
 106  done:
 107         *ngroups = ng;
 108         return (ret);
 109 }
 110
 111 /*! \file */