summaryrefslogtreecommitdiff
path: root/src/libsystemd-shared/include/systemd-shared/conf-parser.h
blob: b5fd4c178750ffd8d0355754f2bd6f4c504c561c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <syslog.h>

#include "systemd-basic/alloc-util.h"
#include "systemd-basic/log.h"
#include "systemd-basic/macro.h"

/* An abstract parser for simple, line based, shallow configuration
 * files consisting of variable assignments only. */

/* Prototype for a parser for a specific configuration setting */
typedef int (*ConfigParserCallback)(const char *unit,
                                    const char *filename,
                                    unsigned line,
                                    const char *section,
                                    unsigned section_line,
                                    const char *lvalue,
                                    int ltype,
                                    const char *rvalue,
                                    void *data,
                                    void *userdata);

/* Wraps information for parsing a specific configuration variable, to
 * be stored in a simple array */
typedef struct ConfigTableItem {
        const char *section;            /* Section */
        const char *lvalue;             /* Name of the variable */
        ConfigParserCallback parse;     /* Function that is called to parse the variable's value */
        int ltype;                      /* Distinguish different variables passed to the same callback */
        void *data;                     /* Where to store the variable's data */
} ConfigTableItem;

/* Wraps information for parsing a specific configuration variable, to
 * be stored in a gperf perfect hashtable */
typedef struct ConfigPerfItem {
        const char *section_and_lvalue; /* Section + "." + name of the variable */
        ConfigParserCallback parse;     /* Function that is called to parse the variable's value */
        int ltype;                      /* Distinguish different variables passed to the same callback */
        size_t offset;                  /* Offset where to store data, from the beginning of userdata */
} ConfigPerfItem;

/* Prototype for a low-level gperf lookup function */
typedef const ConfigPerfItem* (*ConfigPerfItemLookup)(const char *section_and_lvalue, unsigned length);

/* Prototype for a generic high-level lookup function */
typedef int (*ConfigItemLookup)(
                const void *table,
                const char *section,
                const char *lvalue,
                ConfigParserCallback *func,
                int *ltype,
                void **data,
                void *userdata);

/* Linear table search implementation of ConfigItemLookup, based on
 * ConfigTableItem arrays */
int config_item_table_lookup(const void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);

/* gperf implementation of ConfigItemLookup, based on gperf
 * ConfigPerfItem tables */
int config_item_perf_lookup(const void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);

int config_parse(
                const char *unit,
                const char *filename,
                FILE *f,
                const char *sections,  /* nulstr */
                ConfigItemLookup lookup,
                const void *table,
                bool relaxed,
                bool allow_include,
                bool warn,
                void *userdata);

int config_parse_many_nulstr(
                const char *conf_file,      /* possibly NULL */
                const char *conf_file_dirs, /* nulstr */
                const char *sections,       /* nulstr */
                ConfigItemLookup lookup,
                const void *table,
                bool relaxed,
                void *userdata);

int config_parse_many(
                const char *conf_file,      /* possibly NULL */
                const char* const* conf_file_dirs,
                const char *dropin_dirname,
                const char *sections,       /* nulstr */
                ConfigItemLookup lookup,
                const void *table,
                bool relaxed,
                void *userdata);

/* Generic parsers */
int config_parse_int(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_unsigned(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_long(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_uint16(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_uint32(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_uint64(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_double(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line,  const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_iec_size(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_si_size(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_iec_uint64(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_bool(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_tristate(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_string(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_path(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_strv(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_sec(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_nsec(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_mode(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_log_facility(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_log_level(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_signal(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_personality(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_ifname(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);

#define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
        int function(const char *unit,                                  \
                     const char *filename,                              \
                     unsigned line,                                     \
                     const char *section,                               \
                     unsigned section_line,                             \
                     const char *lvalue,                                \
                     int ltype,                                         \
                     const char *rvalue,                                \
                     void *data,                                        \
                     void *userdata) {                                  \
                                                                        \
                type *i = data, x;                                      \
                                                                        \
                assert(filename);                                       \
                assert(lvalue);                                         \
                assert(rvalue);                                         \
                assert(data);                                           \
                                                                        \
                if ((x = name##_from_string(rvalue)) < 0) {             \
                        log_syntax(unit, LOG_ERR, filename, line, -x,   \
                                   msg ", ignoring: %s", rvalue);       \
                        return 0;                                       \
                }                                                       \
                                                                        \
                *i = x;                                                 \
                return 0;                                               \
        }

#define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg)              \
        int function(const char *unit,                                         \
                     const char *filename,                                     \
                     unsigned line,                                            \
                     const char *section,                                      \
                     unsigned section_line,                                    \
                     const char *lvalue,                                       \
                     int ltype,                                                \
                     const char *rvalue,                                       \
                     void *data,                                               \
                     void *userdata) {                                         \
                                                                               \
                type **enums = data, x, *ys;                                   \
                _cleanup_free_ type *xs = NULL;                                \
                const char *word, *state;                                      \
                size_t l, i = 0;                                               \
                                                                               \
                assert(filename);                                              \
                assert(lvalue);                                                \
                assert(rvalue);                                                \
                assert(data);                                                  \
                                                                               \
                xs = new0(type, 1);                                            \
                if (!xs)                                                       \
                        return -ENOMEM;                                        \
                                                                               \
                *xs = invalid;                                                 \
                                                                               \
                FOREACH_WORD(word, l, rvalue, state) {                         \
                        _cleanup_free_ char *en = NULL;                        \
                        type *new_xs;                                          \
                                                                               \
                        en = strndup(word, l);                                 \
                        if (!en)                                               \
                                return -ENOMEM;                                \
                                                                               \
                        if ((x = name##_from_string(en)) < 0) {                \
                                log_syntax(unit, LOG_ERR, filename, line,      \
                                       -x, msg ", ignoring: %s", en);          \
                                continue;                                      \
                        }                                                      \
                                                                               \
                        for (ys = xs; x != invalid && *ys != invalid; ys++) {  \
                                if (*ys == x) {                                \
                                        log_syntax(unit, LOG_ERR, filename,    \
                                              line, -x,                        \
                                              "Duplicate entry, ignoring: %s", \
                                              en);                             \
                                        x = invalid;                           \
                                }                                              \
                        }                                                      \
                                                                               \
                        if (x == invalid)                                      \
                                continue;                                      \
                                                                               \
                        *(xs + i) = x;                                         \
                        new_xs = realloc(xs, (++i + 1) * sizeof(type));        \
                        if (new_xs)                                            \
                                xs = new_xs;                                   \
                        else                                                   \
                                return -ENOMEM;                                \
                                                                               \
                        *(xs + i) = invalid;                                   \
                }                                                              \
                                                                               \
                free(*enums);                                                  \
                *enums = xs;                                                   \
                xs = NULL;                                                     \
                                                                               \
                return 0;                                                      \
        }