src/shared/conf-parser.h

   1 #pragma once
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdbool.h>
  24 #include <stddef.h>
  25 #include <stdio.h>
  26 #include <syslog.h>
  27
  28 #include "alloc-util.h"
  29 #include "log.h"
  30 #include "macro.h"
  31
  32 /* An abstract parser for simple, line based, shallow configuration
  33  * files consisting of variable assignments only. */
  34
  35 /* Prototype for a parser for a specific configuration setting */
  36 typedef int (*ConfigParserCallback)(const char *unit,
  37                                     const char *filename,
  38                                     unsigned line,
  39                                     const char *section,
  40                                     unsigned section_line,
  41                                     const char *lvalue,
  42                                     int ltype,
  43                                     const char *rvalue,
  44                                     void *data,
  45                                     void *userdata);
  46
  47 /* Wraps information for parsing a specific configuration variable, to
  48  * be stored in a simple array */
  49 typedef struct ConfigTableItem {
  50         const char *section;            /* Section */
  51         const char *lvalue;             /* Name of the variable */
  52         ConfigParserCallback parse;     /* Function that is called to parse the variable's value */
  53         int ltype;                      /* Distinguish different variables passed to the same callback */
  54         void *data;                     /* Where to store the variable's data */
  55 } ConfigTableItem;
  56
  57 /* Wraps information for parsing a specific configuration variable, to
  58  * be stored in a gperf perfect hashtable */
  59 typedef struct ConfigPerfItem {
  60         const char *section_and_lvalue; /* Section + "." + name of the variable */
  61         ConfigParserCallback parse;     /* Function that is called to parse the variable's value */
  62         int ltype;                      /* Distinguish different variables passed to the same callback */
  63         size_t offset;                  /* Offset where to store data, from the beginning of userdata */
  64 } ConfigPerfItem;
  65
  66 /* Prototype for a low-level gperf lookup function */
  67 typedef const ConfigPerfItem* (*ConfigPerfItemLookup)(const char *section_and_lvalue, unsigned length);
  68
  69 /* Prototype for a generic high-level lookup function */
  70 typedef int (*ConfigItemLookup)(
  71                 const void *table,
  72                 const char *section,
  73                 const char *lvalue,
  74                 ConfigParserCallback *func,
  75                 int *ltype,
  76                 void **data,
  77                 void *userdata);
  78
  79 /* Linear table search implementation of ConfigItemLookup, based on
  80  * ConfigTableItem arrays */
  81 int config_item_table_lookup(const void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);
  82
  83 /* gperf implementation of ConfigItemLookup, based on gperf
  84  * ConfigPerfItem tables */
  85 int config_item_perf_lookup(const void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata);
  86
  87 int config_parse(const char *unit,
  88                  const char *filename,
  89                  FILE *f,
  90                  const char *sections,  /* nulstr */
  91                  ConfigItemLookup lookup,
  92                  const void *table,
  93                  bool relaxed,
  94                  bool allow_include,
  95                  bool warn,
  96                  void *userdata);
  97
  98 int config_parse_many(const char *conf_file,      /* possibly NULL */
  99                       const char *conf_file_dirs, /* nulstr */
 100                       const char *sections,       /* nulstr */
 101                       ConfigItemLookup lookup,
 102                       const void *table,
 103                       bool relaxed,
 104                       void *userdata);
 105
 106 /* Generic parsers */
 107 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);
 108 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);
 109 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);
 110 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);
 111 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);
 112 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);
 113 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);
 114 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);
 115 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);
 116 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);
 117 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);
 118 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);
 119 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);
 120 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);
 121 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);
 122 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);
 123 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);
 124 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);
 125 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);
 126 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);
 127 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);
 128
 129 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
 130         int function(const char *unit,                                  \
 131                      const char *filename,                              \
 132                      unsigned line,                                     \
 133                      const char *section,                               \
 134                      unsigned section_line,                             \
 135                      const char *lvalue,                                \
 136                      int ltype,                                         \
 137                      const char *rvalue,                                \
 138                      void *data,                                        \
 139                      void *userdata) {                                  \
 140                                                                         \
 141                 type *i = data, x;                                      \
 142                                                                         \
 143                 assert(filename);                                       \
 144                 assert(lvalue);                                         \
 145                 assert(rvalue);                                         \
 146                 assert(data);                                           \
 147                                                                         \
 148                 if ((x = name##_from_string(rvalue)) < 0) {             \
 149                         log_syntax(unit, LOG_ERR, filename, line, -x,   \
 150                                    msg ", ignoring: %s", rvalue);       \
 151                         return 0;                                       \
 152                 }                                                       \
 153                                                                         \
 154                 *i = x;                                                 \
 155                 return 0;                                               \
 156         }
 157
 158 #define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg)              \
 159         int function(const char *unit,                                         \
 160                      const char *filename,                                     \
 161                      unsigned line,                                            \
 162                      const char *section,                                      \
 163                      unsigned section_line,                                    \
 164                      const char *lvalue,                                       \
 165                      int ltype,                                                \
 166                      const char *rvalue,                                       \
 167                      void *data,                                               \
 168                      void *userdata) {                                         \
 169                                                                                \
 170                 type **enums = data, x, *ys;                                   \
 171                 _cleanup_free_ type *xs = NULL;                                \
 172                 const char *word, *state;                                      \
 173                 size_t l, i = 0;                                               \
 174                                                                                \
 175                 assert(filename);                                              \
 176                 assert(lvalue);                                                \
 177                 assert(rvalue);                                                \
 178                 assert(data);                                                  \
 179                                                                                \
 180                 xs = new0(type, 1);                                            \
 181                 if (!xs)                                                       \
 182                         return -ENOMEM;                                        \
 183                                                                                \
 184                 *xs = invalid;                                                 \
 185                                                                                \
 186                 FOREACH_WORD(word, l, rvalue, state) {                         \
 187                         _cleanup_free_ char *en = NULL;                        \
 188                         type *new_xs;                                          \
 189                                                                                \
 190                         en = strndup(word, l);                                 \
 191                         if (!en)                                               \
 192                                 return -ENOMEM;                                \
 193                                                                                \
 194                         if ((x = name##_from_string(en)) < 0) {                \
 195                                 log_syntax(unit, LOG_ERR, filename, line,      \
 196                                        -x, msg ", ignoring: %s", en);          \
 197                                 continue;                                      \
 198                         }                                                      \
 199                                                                                \
 200                         for (ys = xs; x != invalid && *ys != invalid; ys++) {  \
 201                                 if (*ys == x) {                                \
 202                                         log_syntax(unit, LOG_ERR, filename,    \
 203                                               line, -x,                        \
 204                                               "Duplicate entry, ignoring: %s", \
 205                                               en);                             \
 206                                         x = invalid;                           \
 207                                 }                                              \
 208                         }                                                      \
 209                                                                                \
 210                         if (x == invalid)                                      \
 211                                 continue;                                      \
 212                                                                                \
 213                         *(xs + i) = x;                                         \
 214                         new_xs = realloc(xs, (++i + 1) * sizeof(type));        \
 215                         if (new_xs)                                            \
 216                                 xs = new_xs;                                   \
 217                         else                                                   \
 218                                 return -ENOMEM;                                \
 219                                                                                \
 220                         *(xs + i) = invalid;                                   \
 221                 }                                                              \
 222                                                                                \
 223                 free(*enums);                                                  \
 224                 *enums = xs;                                                   \
 225                 xs = NULL;                                                     \
 226                                                                                \
 227                 return 0;                                                      \
 228         }