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 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);
 129
 130 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
 131         int function(const char *unit,                                  \
 132                      const char *filename,                              \
 133                      unsigned line,                                     \
 134                      const char *section,                               \
 135                      unsigned section_line,                             \
 136                      const char *lvalue,                                \
 137                      int ltype,                                         \
 138                      const char *rvalue,                                \
 139                      void *data,                                        \
 140                      void *userdata) {                                  \
 141                                                                         \
 142                 type *i = data, x;                                      \
 143                                                                         \
 144                 assert(filename);                                       \
 145                 assert(lvalue);                                         \
 146                 assert(rvalue);                                         \
 147                 assert(data);                                           \
 148                                                                         \
 149                 if ((x = name##_from_string(rvalue)) < 0) {             \
 150                         log_syntax(unit, LOG_ERR, filename, line, -x,   \
 151                                    msg ", ignoring: %s", rvalue);       \
 152                         return 0;                                       \
 153                 }                                                       \
 154                                                                         \
 155                 *i = x;                                                 \
 156                 return 0;                                               \
 157         }
 158
 159 #define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg)              \
 160         int function(const char *unit,                                         \
 161                      const char *filename,                                     \
 162                      unsigned line,                                            \
 163                      const char *section,                                      \
 164                      unsigned section_line,                                    \
 165                      const char *lvalue,                                       \
 166                      int ltype,                                                \
 167                      const char *rvalue,                                       \
 168                      void *data,                                               \
 169                      void *userdata) {                                         \
 170                                                                                \
 171                 type **enums = data, x, *ys;                                   \
 172                 _cleanup_free_ type *xs = NULL;                                \
 173                 const char *word, *state;                                      \
 174                 size_t l, i = 0;                                               \
 175                                                                                \
 176                 assert(filename);                                              \
 177                 assert(lvalue);                                                \
 178                 assert(rvalue);                                                \
 179                 assert(data);                                                  \
 180                                                                                \
 181                 xs = new0(type, 1);                                            \
 182                 if (!xs)                                                       \
 183                         return -ENOMEM;                                        \
 184                                                                                \
 185                 *xs = invalid;                                                 \
 186                                                                                \
 187                 FOREACH_WORD(word, l, rvalue, state) {                         \
 188                         _cleanup_free_ char *en = NULL;                        \
 189                         type *new_xs;                                          \
 190                                                                                \
 191                         en = strndup(word, l);                                 \
 192                         if (!en)                                               \
 193                                 return -ENOMEM;                                \
 194                                                                                \
 195                         if ((x = name##_from_string(en)) < 0) {                \
 196                                 log_syntax(unit, LOG_ERR, filename, line,      \
 197                                        -x, msg ", ignoring: %s", en);          \
 198                                 continue;                                      \
 199                         }                                                      \
 200                                                                                \
 201                         for (ys = xs; x != invalid && *ys != invalid; ys++) {  \
 202                                 if (*ys == x) {                                \
 203                                         log_syntax(unit, LOG_ERR, filename,    \
 204                                               line, -x,                        \
 205                                               "Duplicate entry, ignoring: %s", \
 206                                               en);                             \
 207                                         x = invalid;                           \
 208                                 }                                              \
 209                         }                                                      \
 210                                                                                \
 211                         if (x == invalid)                                      \
 212                                 continue;                                      \
 213                                                                                \
 214                         *(xs + i) = x;                                         \
 215                         new_xs = realloc(xs, (++i + 1) * sizeof(type));        \
 216                         if (new_xs)                                            \
 217                                 xs = new_xs;                                   \
 218                         else                                                   \
 219                                 return -ENOMEM;                                \
 220                                                                                \
 221                         *(xs + i) = invalid;                                   \
 222                 }                                                              \
 223                                                                                \
 224                 free(*enums);                                                  \
 225                 *enums = xs;                                                   \
 226                 xs = NULL;                                                     \
 227                                                                                \
 228                 return 0;                                                      \
 229         }