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(
  88                 const char *unit,
  89                 const char *filename,
  90                 FILE *f,
  91                 const char *sections,  /* nulstr */
  92                 ConfigItemLookup lookup,
  93                 const void *table,
  94                 bool relaxed,
  95                 bool allow_include,
  96                 bool warn,
  97                 void *userdata);
  98
  99 int config_parse_many_nulstr(
 100                 const char *conf_file,      /* possibly NULL */
 101                 const char *conf_file_dirs, /* nulstr */
 102                 const char *sections,       /* nulstr */
 103                 ConfigItemLookup lookup,
 104                 const void *table,
 105                 bool relaxed,
 106                 void *userdata);
 107
 108 int config_parse_many(
 109                 const char *conf_file,      /* possibly NULL */
 110                 const char* const* conf_file_dirs,
 111                 const char *dropin_dirname,
 112                 const char *sections,       /* nulstr */
 113                 ConfigItemLookup lookup,
 114                 const void *table,
 115                 bool relaxed,
 116                 void *userdata);
 117
 118 /* Generic parsers */
 119 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);
 120 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);
 121 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);
 122 int config_parse_uint8(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_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);
 124 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);
 125 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);
 126 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);
 127 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);
 128 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);
 129 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);
 130 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);
 131 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);
 132 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);
 133 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);
 134 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);
 135 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);
 136 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);
 137 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);
 138 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);
 139 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);
 140 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);
 141 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);
 142 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);
 143 int config_parse_ip_port(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);
 144
 145 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
 146         int function(const char *unit,                                  \
 147                      const char *filename,                              \
 148                      unsigned line,                                     \
 149                      const char *section,                               \
 150                      unsigned section_line,                             \
 151                      const char *lvalue,                                \
 152                      int ltype,                                         \
 153                      const char *rvalue,                                \
 154                      void *data,                                        \
 155                      void *userdata) {                                  \
 156                                                                         \
 157                 type *i = data, x;                                      \
 158                                                                         \
 159                 assert(filename);                                       \
 160                 assert(lvalue);                                         \
 161                 assert(rvalue);                                         \
 162                 assert(data);                                           \
 163                                                                         \
 164                 if ((x = name##_from_string(rvalue)) < 0) {             \
 165                         log_syntax(unit, LOG_ERR, filename, line, -x,   \
 166                                    msg ", ignoring: %s", rvalue);       \
 167                         return 0;                                       \
 168                 }                                                       \
 169                                                                         \
 170                 *i = x;                                                 \
 171                 return 0;                                               \
 172         }
 173
 174 #define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg)              \
 175         int function(const char *unit,                                         \
 176                      const char *filename,                                     \
 177                      unsigned line,                                            \
 178                      const char *section,                                      \
 179                      unsigned section_line,                                    \
 180                      const char *lvalue,                                       \
 181                      int ltype,                                                \
 182                      const char *rvalue,                                       \
 183                      void *data,                                               \
 184                      void *userdata) {                                         \
 185                                                                                \
 186                 type **enums = data, x, *ys;                                   \
 187                 _cleanup_free_ type *xs = NULL;                                \
 188                 const char *word, *state;                                      \
 189                 size_t l, i = 0;                                               \
 190                                                                                \
 191                 assert(filename);                                              \
 192                 assert(lvalue);                                                \
 193                 assert(rvalue);                                                \
 194                 assert(data);                                                  \
 195                                                                                \
 196                 xs = new0(type, 1);                                            \
 197                 if (!xs)                                                       \
 198                         return -ENOMEM;                                        \
 199                                                                                \
 200                 *xs = invalid;                                                 \
 201                                                                                \
 202                 FOREACH_WORD(word, l, rvalue, state) {                         \
 203                         _cleanup_free_ char *en = NULL;                        \
 204                         type *new_xs;                                          \
 205                                                                                \
 206                         en = strndup(word, l);                                 \
 207                         if (!en)                                               \
 208                                 return -ENOMEM;                                \
 209                                                                                \
 210                         if ((x = name##_from_string(en)) < 0) {                \
 211                                 log_syntax(unit, LOG_ERR, filename, line,      \
 212                                        -x, msg ", ignoring: %s", en);          \
 213                                 continue;                                      \
 214                         }                                                      \
 215                                                                                \
 216                         for (ys = xs; x != invalid && *ys != invalid; ys++) {  \
 217                                 if (*ys == x) {                                \
 218                                         log_syntax(unit, LOG_ERR, filename,    \
 219                                               line, -x,                        \
 220                                               "Duplicate entry, ignoring: %s", \
 221                                               en);                             \
 222                                         x = invalid;                           \
 223                                 }                                              \
 224                         }                                                      \
 225                                                                                \
 226                         if (x == invalid)                                      \
 227                                 continue;                                      \
 228                                                                                \
 229                         *(xs + i) = x;                                         \
 230                         new_xs = realloc(xs, (++i + 1) * sizeof(type));        \
 231                         if (new_xs)                                            \
 232                                 xs = new_xs;                                   \
 233                         else                                                   \
 234                                 return -ENOMEM;                                \
 235                                                                                \
 236                         *(xs + i) = invalid;                                   \
 237                 }                                                              \
 238                                                                                \
 239                 free(*enums);                                                  \
 240                 *enums = xs;                                                   \
 241                 xs = NULL;                                                     \
 242                                                                                \
 243                 return 0;                                                      \
 244         }