lib/libuutil/uu_ident.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 https://opensource.org/licenses/CDDL-1.0.
  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 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27
  28
  29 #include "libuutil_common.h"
  30
  31 #include <string.h>
  32
  33 /*
  34  * We require names of the form:
  35  *      [provider,]identifier[/[provider,]identifier]...
  36  *
  37  * Where provider is either a stock symbol (SUNW) or a java-style reversed
  38  * domain name (com.sun).
  39  *
  40  * Both providers and identifiers must start with a letter, and may
  41  * only contain alphanumerics, dashes, and underlines.  Providers
  42  * may also contain periods.
  43  *
  44  * Note that we do _not_ use the macros in <ctype.h>, since they are affected
  45  * by the current locale settings.
  46  */
  47
  48 #define IS_ALPHA(c) \
  49         (((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
  50
  51 #define IS_DIGIT(c) \
  52         ((c) >= '0' && (c) <= '9')
  53
  54 static int
  55 is_valid_ident(const char *s, const char *e, int allowdot)
  56 {
  57         char c;
  58
  59         if (s >= e)
  60                 return (0);             /* name is empty */
  61
  62         c = *s++;
  63         if (!IS_ALPHA(c))
  64                 return (0);             /* does not start with letter */
  65
  66         while (s < e && (c = *s++) != 0) {
  67                 if (IS_ALPHA(c) || IS_DIGIT(c) || c == '-' || c == '_' ||
  68                     (allowdot && c == '.'))
  69                         continue;
  70                 return (0);             /* invalid character */
  71         }
  72         return (1);
  73 }
  74
  75 static int
  76 is_valid_component(const char *b, const char *e, uint_t flags)
  77 {
  78         char *sp;
  79
  80         if (flags & UU_NAME_DOMAIN) {
  81                 sp = strchr(b, ',');
  82                 if (sp != NULL && sp < e) {
  83                         if (!is_valid_ident(b, sp, 1))
  84                                 return (0);
  85                         b = sp + 1;
  86                 }
  87         }
  88
  89         return (is_valid_ident(b, e, 0));
  90 }
  91
  92 int
  93 uu_check_name(const char *name, uint_t flags)
  94 {
  95         const char *end = name + strlen(name);
  96         const char *p;
  97
  98         if (flags & ~(UU_NAME_DOMAIN | UU_NAME_PATH)) {
  99                 uu_set_error(UU_ERROR_UNKNOWN_FLAG);
 100                 return (-1);
 101         }
 102
 103         if (!(flags & UU_NAME_PATH)) {
 104                 if (!is_valid_component(name, end, flags))
 105                         goto bad;
 106                 return (0);
 107         }
 108
 109         while ((p = strchr(name, '/')) != NULL) {
 110                 if (!is_valid_component(name, p - 1, flags))
 111                         goto bad;
 112                 name = p + 1;
 113         }
 114         if (!is_valid_component(name, end, flags))
 115                 goto bad;
 116
 117         return (0);
 118
 119 bad:
 120         uu_set_error(UU_ERROR_INVALID_ARGUMENT);
 121         return (-1);
 122 }