usr/src/lib/libsocket/inet/bootparams_getbyname.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  *
  22  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <ctype.h>
  31 #include <sys/types.h>
  32 #include <nss_dbdefs.h>
  33
  34 static int str2bootent(const char *, int, void *, char *, int);
  35
  36 static DEFINE_NSS_DB_ROOT(db_root);
  37
  38 static void
  39 _nss_initf_bootparams(nss_db_params_t *p)
  40 {
  41         p->name = NSS_DBNAM_BOOTPARAMS;
  42         p->default_config = NSS_DEFCONF_BOOTPARAMS;
  43 }
  44
  45 int
  46 bootparams_getbyname(
  47     char *name, /* lookup key */
  48     char *linebuf,      /* buffer to put the answer in */
  49     int linelen /* max # of bytes to put into linebuf */
  50 )
  51 {
  52         nss_XbyY_args_t arg;
  53         nss_status_t    res;
  54
  55         NSS_XbyY_INIT(&arg, linebuf, linebuf, linelen, str2bootent);
  56         arg.key.name = name;
  57         res = nss_search(&db_root, _nss_initf_bootparams,
  58                         NSS_DBOP_BOOTPARAMS_BYNAME, &arg);
  59         (void) NSS_XbyY_FINI(&arg);
  60         return (arg.status = res);
  61 }
  62
  63 /*
  64  * Return values: 0 = success, 1 = parse error, 2 = erange ...
  65  * The structure pointer passed in is a buffer in the caller's space.
  66  * instring and buffer should be separate areas.
  67  * The calling routine does all the real parsing; we just check limits and
  68  * store the entry in the buffer we were passed by the caller.
  69  * NOTE: we expect the data we're passed (in instr) has had the host's name
  70  * stripped off the begining.
  71  */
  72 /* ARGSUSED */
  73 static int
  74 str2bootent(
  75     const char *instr,
  76     int lenstr,
  77     void *ent,          /* really (char *) */
  78     char *buffer,
  79     int buflen
  80 )
  81 {
  82         const char      *p, *limit;
  83
  84         if ((instr >= buffer && (buffer + buflen) > instr) ||
  85             (buffer >= instr && (instr + lenstr) > buffer)) {
  86                 return (NSS_STR_PARSE_PARSE);
  87         }
  88         p = instr;
  89         limit = p + lenstr;
  90
  91         /* Skip over leading whitespace */
  92         while (p < limit && isspace(*p)) {
  93                 p++;
  94         }
  95         if (p >= limit) {
  96                 /* Syntax error -- no data! */
  97                 return (NSS_STR_PARSE_PARSE);
  98         }
  99         lenstr -= (p - instr);
 100         if (buflen <= lenstr) {         /* not enough buffer */
 101                 return (NSS_STR_PARSE_ERANGE);
 102         }
 103         (void) memcpy(buffer, p, lenstr);
 104         buffer[lenstr] = '\0';
 105
 106         return (NSS_STR_PARSE_SUCCESS);
 107 }