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  * be stored 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                 const 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(const 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(const 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                  const void *table,
  90                  bool relaxed,
  91                  bool allow_include,
  92                  bool warn,
  93                  void *userdata);
  94
  95 int config_parse_many(const char *conf_file,      /* possibly NULL */
  96                       const char *conf_file_dirs, /* nulstr */
  97                       const char *sections,       /* nulstr */
  98                       ConfigItemLookup lookup,
  99                       const void *table,
 100                       bool relaxed,
 101                       void *userdata);
 102
 103 /* Generic parsers */
 104 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);
 105 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);
 106 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);
 107 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);
 108 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);
 109 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);
 110 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);
 111 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);
 112 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);
 113 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);
 114 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);
 115 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);
 116 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);
 117 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);
 118 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);
 119 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);
 120 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);
 121 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);
 122 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);
 123 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);
 124 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);
 125
 126 #define log_invalid_utf8(unit, level, config_file, config_line, error, rvalue) \
 127         do {                                                            \
 128                 _cleanup_free_ char *_p = utf8_escape_invalid(rvalue);  \
 129                 log_syntax(unit, level, config_file, config_line, error, \
 130                            "String is not UTF-8 clean, ignoring assignment: %s", strna(_p)); \
 131         } while(false)
 132
 133 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
 134         int function(const char *unit,                                  \
 135                      const char *filename,                              \
 136                      unsigned line,                                     \
 137                      const char *section,                               \
 138                      unsigned section_line,                             \
 139                      const char *lvalue,                                \
 140                      int ltype,                                         \
 141                      const char *rvalue,                                \
 142                      void *data,                                        \
 143                      void *userdata) {                                  \
 144                                                                         \
 145                 type *i = data, x;                                      \
 146                                                                         \
 147                 assert(filename);                                       \
 148                 assert(lvalue);                                         \
 149                 assert(rvalue);                                         \
 150                 assert(data);                                           \
 151                                                                         \
 152                 if ((x = name##_from_string(rvalue)) < 0) {             \
 153                         log_syntax(unit, LOG_ERR, filename, line, -x,   \
 154                                    msg ", ignoring: %s", rvalue);       \
 155                         return 0;                                       \
 156                 }                                                       \
 157                                                                         \
 158                 *i = x;                                                 \
 159                 return 0;                                               \
 160         }
 161
 162 #define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg)              \
 163         int function(const char *unit,                                         \
 164                      const char *filename,                                     \
 165                      unsigned line,                                            \
 166                      const char *section,                                      \
 167                      unsigned section_line,                                    \
 168                      const char *lvalue,                                       \
 169                      int ltype,                                                \
 170                      const char *rvalue,                                       \
 171                      void *data,                                               \
 172                      void *userdata) {                                         \
 173                                                                                \
 174                 type **enums = data, x, *ys;                                   \
 175                 _cleanup_free_ type *xs = NULL;                                \
 176                 const char *word, *state;                                      \
 177                 size_t l, i = 0;                                               \
 178                                                                                \
 179                 assert(filename);                                              \
 180                 assert(lvalue);                                                \
 181                 assert(rvalue);                                                \
 182                 assert(data);                                                  \
 183                                                                                \
 184                 xs = new0(type, 1);                                            \
 185                 if(!xs)                                                        \
 186                         return -ENOMEM;                                        \
 187                                                                                \
 188                 *xs = invalid;                                                 \
 189                                                                                \
 190                 FOREACH_WORD(word, l, rvalue, state) {                         \
 191                         _cleanup_free_ char *en = NULL;                        \
 192                         type *new_xs;                                          \
 193                                                                                \
 194                         en = strndup(word, l);                                 \
 195                         if (!en)                                               \
 196                                 return -ENOMEM;                                \
 197                                                                                \
 198                         if ((x = name##_from_string(en)) < 0) {                \
 199                                 log_syntax(unit, LOG_ERR, filename, line,      \
 200                                        -x, msg ", ignoring: %s", en);          \
 201                                 continue;                                      \
 202                         }                                                      \
 203                                                                                \
 204                         for (ys = xs; x != invalid && *ys != invalid; ys++) {  \
 205                                 if (*ys == x) {                                \
 206                                         log_syntax(unit, LOG_ERR, filename,    \
 207                                               line, -x,                        \
 208                                               "Duplicate entry, ignoring: %s", \
 209                                               en);                             \
 210                                         x = invalid;                           \
 211                                 }                                              \
 212                         }                                                      \
 213                                                                                \
 214                         if (x == invalid)                                      \
 215                                 continue;                                      \
 216                                                                                \
 217                         *(xs + i) = x;                                         \
 218                         new_xs = realloc(xs, (++i + 1) * sizeof(type));        \
 219                         if (new_xs)                                            \
 220                                 xs = new_xs;                                   \
 221                         else                                                   \
 222                                 return -ENOMEM;                                \
 223                                                                                \
 224                         *(xs + i) = invalid;                                   \
 225                 }                                                              \
 226                                                                                \
 227                 free(*enums);                                                  \
 228                 *enums = xs;                                                   \
 229                 xs = NULL;                                                     \
 230                                                                                \
 231                 return 0;                                                      \
 232         }