1 /* $NetBSD: postconf_match.c,v 1.1.1.1 2014/07/06 19:27:53 tron Exp $ */
2
3 /*++
4 /* NAME
5 /* postconf_match 3
6 /* SUMMARY
7 /* pattern-matching support
8 /* SYNOPSIS
9 /* #include <postconf.h>
10 /*
11 /* int pcf_parse_field_pattern(field_expr)
12 /* char *field_expr;
13 /*
14 /* const char *pcf_str_field_pattern(field_pattern)
15 /* int field_pattern;
16 /*
17 /* int pcf_is_magic_field_pattern(field_pattern)
18 /* int field_pattern;
19 /*
20 /* ARGV *pcf_parse_service_pattern(service_expr, min_expr, max_expr)
21 /* const char *service_expr;
22 /* int min_expr;
23 /* int max_expr;
24 /*
25 /* int PCF_IS_MAGIC_SERVICE_PATTERN(service_pattern)
26 /* const ARGV *service_pattern;
27 /*
28 /* int PCF_MATCH_SERVICE_PATTERN(service_pattern, service_name,
29 /* service_type)
30 /* const ARGV *service_pattern;
31 /* const char *service_name;
32 /* const char *service_type;
33 /*
34 /* const char *pcf_str_field_pattern(field_pattern)
35 /* int field_pattern;
36 /*
37 /* int PCF_IS_MAGIC_PARAM_PATTERN(param_pattern)
38 /* const char *param_pattern;
39 /*
40 /* int PCF_MATCH_PARAM_PATTERN(param_pattern, param_name)
41 /* const char *param_pattern;
42 /* const char *param_name;
43 /* DESCRIPTION
44 /* pcf_parse_service_pattern() takes an expression and splits
45 /* it up on '/' into an array of sub-expressions, This function
46 /* returns null if the input does fewer than "min" or more
47 /* than "max" sub-expressions.
48 /*
49 /* PCF_IS_MAGIC_SERVICE_PATTERN() returns non-zero if any of
50 /* the service name or service type sub-expressions contains
51 /* a matching operator (as opposed to string literals that
52 /* only match themselves). This is an unsafe macro that evaluates
53 /* its arguments more than once.
54 /*
55 /* PCF_MATCH_SERVICE_PATTERN() matches a service name and type
56 /* from master.cf against the parsed pattern. This is an unsafe
57 /* macro that evaluates its arguments more than once.
58 /*
59 /* pcf_parse_field_pattern() converts a field sub-expression,
60 /* and returns the conversion result.
61 /*
62 /* pcf_str_field_pattern() converts a result from
63 /* pcf_parse_field_pattern() into string form.
64 /*
65 /* pcf_is_magic_field_pattern() returns non-zero if the field
66 /* pattern sub-expression contained a matching operator (as
67 /* opposed to a string literal that only matches itself).
68 /*
69 /* PCF_IS_MAGIC_PARAM_PATTERN() returns non-zero if the parameter
70 /* sub-expression contains a matching operator (as opposed to
71 /* a string literal that only matches itself). This is an
72 /* unsafe macro that evaluates its arguments more than once.
73 /*
74 /* PCF_MATCH_PARAM_PATTERN() matches a parameter name from
75 /* master.cf against the parsed pattern. This is an unsafe
76 /* macro that evaluates its arguments more than once.
77 /*
78 /* Arguments
79 /* .IP field_expr
80 /* A field expression.
81 /* .IP service_expr
82 /* This argument is split on '/' into its constituent
83 /* sub-expressions.
84 /* .IP min_expr
85 /* The minimum number of sub-expressions in service_expr.
86 /* .IP max_expr
87 /* The maximum number of sub-expressions in service_expr.
88 /* .IP service_name
89 /* Service name from master.cf.
90 /* .IP service_type
91 /* Service type from master.cf.
92 /* .IP param_pattern
93 /* A parameter name expression.
94 /* DIAGNOSTICS
95 /* Fatal errors: invalid syntax.
96 /* LICENSE
97 /* .ad
98 /* .fi
99 /* The Secure Mailer license must be distributed with this software.
100 /* AUTHOR(S)
101 /* Wietse Venema
102 /* IBM T.J. Watson Research
103 /* P.O. Box 704
104 /* Yorktown Heights, NY 10598, USA
105 /*--*/
106
107 /* System library. */
108
109 #include <sys_defs.h>
110 #include <string.h>
111
112 /* Utility library. */
113
114 #include <msg.h>
115 #include <mymalloc.h>
116 #include <vstring.h>
117
118 /* Global library. */
119
120 #include <split_at.h>
121
122 /* Application-specific. */
123
124 #include <postconf.h>
125
126 /*
127 * Conversion table. Each PCF_MASTER_NAME_XXX name entry must be stored at
128 * table offset PCF_MASTER_FLD_XXX. So don't mess it up.
129 */
130 NAME_CODE pcf_field_name_offset[] = {
131 PCF_MASTER_NAME_SERVICE, PCF_MASTER_FLD_SERVICE,
132 PCF_MASTER_NAME_TYPE, PCF_MASTER_FLD_TYPE,
133 PCF_MASTER_NAME_PRIVATE, PCF_MASTER_FLD_PRIVATE,
134 PCF_MASTER_NAME_UNPRIV, PCF_MASTER_FLD_UNPRIV,
135 PCF_MASTER_NAME_CHROOT, PCF_MASTER_FLD_CHROOT,
136 PCF_MASTER_NAME_WAKEUP, PCF_MASTER_FLD_WAKEUP,
137 PCF_MASTER_NAME_MAXPROC, PCF_MASTER_FLD_MAXPROC,
138 PCF_MASTER_NAME_CMD, PCF_MASTER_FLD_CMD,
139 "*", PCF_MASTER_FLD_WILDC,
140 0, PCF_MASTER_FLD_NONE,
141 };
142
143 /* pcf_parse_field_pattern - parse service attribute pattern */
144
pcf_parse_field_pattern(const char * field_name)145 int pcf_parse_field_pattern(const char *field_name)
146 {
147 int field_pattern;
148
149 if ((field_pattern = name_code(pcf_field_name_offset,
150 NAME_CODE_FLAG_STRICT_CASE,
151 field_name)) == PCF_MASTER_FLD_NONE)
152 msg_fatal("invalid service attribute name: \"%s\"", field_name);
153 return (field_pattern);
154 }
155
156 /* pcf_parse_service_pattern - parse service pattern */
157
pcf_parse_service_pattern(const char * pattern,int min_expr,int max_expr)158 ARGV *pcf_parse_service_pattern(const char *pattern, int min_expr, int max_expr)
159 {
160 ARGV *argv;
161 char **cpp;
162
163 /*
164 * Work around argv_split() lameness.
165 */
166 if (*pattern == '/')
167 return (0);
168 argv = argv_split(pattern, PCF_NAMESP_SEP_STR);
169 if (argv->argc < min_expr || argv->argc > max_expr) {
170 argv_free(argv);
171 return (0);
172 }
173
174 /*
175 * Allow '*' only all by itself.
176 */
177 for (cpp = argv->argv; *cpp; cpp++) {
178 if (!PCF_MATCH_ANY(*cpp) && strchr(*cpp, PCF_MATCH_WILDC_STR[0]) != 0) {
179 argv_free(argv);
180 return (0);
181 }
182 }
183
184 /*
185 * Provide defaults for missing fields.
186 */
187 while (argv->argc < max_expr)
188 argv_add(argv, PCF_MATCH_WILDC_STR, ARGV_END);
189 return (argv);
190 }
191