src/shared/conf-parser.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <stdio.h>
  25 #include <stdbool.h>
  26
  27 #include "macro.h"
  28
  29 /* An abstract parser for simple, line based, shallow configuration
  30  * files consisting of variable assignments only. */
  31
  32 /* Prototype for a parser for a specific configuration setting */
  33 typedef int (*ConfigParserCallback)(const char *unit,
  34                                     const char *filename,
  35                                     unsigned line,
  36                                     const char *section,
  37                                     unsigned section_line,
  38                                     const char *lvalue,
  39                                     int ltype,
  40                                     const char *rvalue,
  41                                     void *data,
  42                                     void *userdata);
  43
  44 /* Wraps information for parsing a specific configuration variable, to
  45  * be stored in a simple array */
  46 typedef struct ConfigTableItem {
  47         const char *section;            /* Section */
  48         const char *lvalue;             /* Name of the variable */
  49         ConfigParserCallback parse;     /* Function that is called to parse the variable's value */
  50         int ltype;                      /* Distinguish different variables passed to the same callback */
  51         void *data;                     /* Where to store the variable's data */
  52 } ConfigTableItem;
  53
  54 /* Wraps information for parsing a specific configuration variable, to
  55  * ve srored in a gperf perfect hashtable */
  56 typedef struct ConfigPerfItem {
  57         const char *section_and_lvalue; /* Section + "." + name of the variable */
  58         ConfigParserCallback parse;     /* Function that is called to parse the variable's value */
  59         int ltype;                      /* Distinguish different variables passed to the same callback */
  60         size_t offset;                  /* Offset where to store data, from the beginning of userdata */
  61 } ConfigPerfItem;
  62
  63 /* Prototype for a low-level gperf lookup function */
  64 typedef const ConfigPerfItem* (*ConfigPerfItemLookup)(const char *section_and_lvalue, unsigned length);
  65
  66 /* Prototype for a generic high-level lookup function */
  67 typedef int (*ConfigItemLookup)(
  68                 void *table,
  69                 const char *section,
  70                 const char *lvalue,
  71                 ConfigParserCallback *func,
  72                 int *ltype,
  73                 void **data,
  74                 void *userdata);
  75
  76 /* Linear table search implementation of ConfigItemLookup, based on
  77  * ConfigTableItem arrays */
  78 int config_item_table_lookup(void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);
  79
  80 /* gperf implementation of ConfigItemLookup, based on gperf
  81  * ConfigPerfItem tables */
  82 int config_item_perf_lookup(void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);
  83
  84 int config_parse(const char *unit,
  85                  const char *filename,
  86                  FILE *f,
  87                  const char *sections,  /* nulstr */
  88                  ConfigItemLookup lookup,
  89                  void *table,
  90                  bool relaxed,
  91                  bool allow_include,
  92                  void *userdata);
  93
  94 /* Generic parsers */
  95 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);
  96 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);
  97 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);
  98 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);
  99 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);
 100 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);
 101 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);
 102 int config_parse_iec_off(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);
 103 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);
 104 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);
 105 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);
 106 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);
 107 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);
 108 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);
 109 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);
 110 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);
 111 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);
 112
 113 int log_syntax_internal(const char *unit, int level,
 114                         const char *file, unsigned line, const char *func,
 115                         const char *config_file, unsigned config_line,
 116                         int error, const char *format, ...) _printf_(9, 10);
 117
 118 #define log_syntax(unit, level, config_file, config_line, error, ...)   \
 119         log_syntax_internal(unit, level,                                \
 120                             __FILE__, __LINE__, __func__,               \
 121                             config_file, config_line,                   \
 122                             error, __VA_ARGS__)
 123
 124 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
 125         int function(const char *unit,                                  \
 126                      const char *filename,                              \
 127                      unsigned line,                                     \
 128                      const char *section,                               \
 129                      unsigned section_line,                             \
 130                      const char *lvalue,                                \
 131                      int ltype,                                         \
 132                      const char *rvalue,                                \
 133                      void *data,                                        \
 134                      void *userdata) {                                  \
 135                                                                         \
 136                 type *i = data, x;                                      \
 137                                                                         \
 138                 assert(filename);                                       \
 139                 assert(lvalue);                                         \
 140                 assert(rvalue);                                         \
 141                 assert(data);                                           \
 142                                                                         \
 143                 if ((x = name##_from_string(rvalue)) < 0) {             \
 144                         log_syntax(unit, LOG_ERR, filename, line, -x,   \
 145                                    msg ", ignoring: %s", rvalue);       \
 146                         return 0;                                       \
 147                 }                                                       \
 148                                                                         \
 149                 *i = x;                                                 \
 150                 return 0;                                               \
 151         }
 152
 153 #define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg)              \
 154         int function(const char *unit,                                         \
 155                      const char *filename,                                     \
 156                      unsigned line,                                            \
 157                      const char *section,                                      \
 158                      unsigned section_line,                                    \
 159                      const char *lvalue,                                       \
 160                      int ltype,                                                \
 161                      const char *rvalue,                                       \
 162                      void *data,                                               \
 163                      void *userdata) {                                         \
 164                                                                                \
 165                 type **enums = data, *xs, x, *ys;                              \
 166                 char *w, *state;                                               \
 167                 size_t l, i = 0;                                               \
 168                                                                                \
 169                 assert(filename);                                              \
 170                 assert(lvalue);                                                \
 171                 assert(rvalue);                                                \
 172                 assert(data);                                                  \
 173                                                                                \
 174                 xs = new0(type, 1);                                            \
 175                 *xs = invalid;                                                 \
 176                                                                                \
 177                 FOREACH_WORD(w, l, rvalue, state) {                            \
 178                         _cleanup_free_ char *en = NULL;                        \
 179                                                                                \
 180                         en = strndup(w, l);                                    \
 181                         if (!en)                                               \
 182                                 return -ENOMEM;                                \
 183                                                                                \
 184                         if ((x = name##_from_string(en)) < 0) {                \
 185                                 log_syntax(unit, LOG_ERR, filename, line,      \
 186                                        -x, msg ", ignoring: %s", en);          \
 187                                 continue;                                      \
 188                         }                                                      \
 189                                                                                \
 190                         for (ys = xs; x != invalid && *ys != invalid; ys++) {  \
 191                                 if (*ys == x) {                                \
 192                                         log_syntax(unit, LOG_ERR, filename,    \
 193                                               line, -x,                        \
 194                                               "Duplicate entry, ignoring: %s", \
 195                                               en);                             \
 196                                         x = invalid;                           \
 197                                 }                                              \
 198                         }                                                      \
 199                                                                                \
 200                         if (x == invalid)                                      \
 201                                 continue;                                      \
 202                                                                                \
 203                         *(xs + i) = x;                                         \
 204                         xs = realloc(xs, (++i + 1) * sizeof(type));            \
 205                         if (!xs)                                               \
 206                                 return -ENOMEM;                                \
 207                         *(xs + i) = invalid;                                   \
 208                 }                                                              \
 209                                                                                \
 210                 free(*enums);                                                  \
 211                 *enums = xs;                                                   \
 212                 return 0;                                                      \
 213         }