diff options
Diffstat (limited to 'src/libshared/conf-parser.h')
| -rw-r--r-- | src/libshared/conf-parser.h | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/libshared/conf-parser.h b/src/libshared/conf-parser.h new file mode 100644 index 0000000000..a91c94c322 --- /dev/null +++ b/src/libshared/conf-parser.h @@ -0,0 +1,228 @@ +#pragma once + +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdio.h> +#include <syslog.h> + +#include "alloc-util.h" +#include "log.h" +#include "macro.h" + +/* An abstract parser for simple, line based, shallow configuration + * files consisting of variable assignments only. */ + +/* Prototype for a parser for a specific configuration setting */ +typedef int (*ConfigParserCallback)(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); + +/* Wraps information for parsing a specific configuration variable, to + * be stored in a simple array */ +typedef struct ConfigTableItem { + const char *section; /* Section */ + const char *lvalue; /* Name of the variable */ + ConfigParserCallback parse; /* Function that is called to parse the variable's value */ + int ltype; /* Distinguish different variables passed to the same callback */ + void *data; /* Where to store the variable's data */ +} ConfigTableItem; + +/* Wraps information for parsing a specific configuration variable, to + * be stored in a gperf perfect hashtable */ +typedef struct ConfigPerfItem { + const char *section_and_lvalue; /* Section + "." + name of the variable */ + ConfigParserCallback parse; /* Function that is called to parse the variable's value */ + int ltype; /* Distinguish different variables passed to the same callback */ + size_t offset; /* Offset where to store data, from the beginning of userdata */ +} ConfigPerfItem; + +/* Prototype for a low-level gperf lookup function */ +typedef const ConfigPerfItem* (*ConfigPerfItemLookup)(const char *section_and_lvalue, unsigned length); + +/* Prototype for a generic high-level lookup function */ +typedef int (*ConfigItemLookup)( + const void *table, + const char *section, + const char *lvalue, + ConfigParserCallback *func, + int *ltype, + void **data, + void *userdata); + +/* Linear table search implementation of ConfigItemLookup, based on + * ConfigTableItem arrays */ +int config_item_table_lookup(const void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata); + +/* gperf implementation of ConfigItemLookup, based on gperf + * ConfigPerfItem tables */ +int config_item_perf_lookup(const void *table, const char *section, const char *lvalue, ConfigParserCallback *func, int *ltype, void **data, void *userdata); + +int config_parse(const char *unit, + const char *filename, + FILE *f, + const char *sections, /* nulstr */ + ConfigItemLookup lookup, + const void *table, + bool relaxed, + bool allow_include, + bool warn, + void *userdata); + +int config_parse_many(const char *conf_file, /* possibly NULL */ + const char *conf_file_dirs, /* nulstr */ + const char *sections, /* nulstr */ + ConfigItemLookup lookup, + const void *table, + bool relaxed, + void *userdata); + +/* Generic parsers */ +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); +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); + +#define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg) \ + int function(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) { \ + \ + type *i = data, x; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + assert(data); \ + \ + if ((x = name##_from_string(rvalue)) < 0) { \ + log_syntax(unit, LOG_ERR, filename, line, -x, \ + msg ", ignoring: %s", rvalue); \ + return 0; \ + } \ + \ + *i = x; \ + return 0; \ + } + +#define DEFINE_CONFIG_PARSE_ENUMV(function,name,type,invalid,msg) \ + int function(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) { \ + \ + type **enums = data, x, *ys; \ + _cleanup_free_ type *xs = NULL; \ + const char *word, *state; \ + size_t l, i = 0; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + assert(data); \ + \ + xs = new0(type, 1); \ + if(!xs) \ + return -ENOMEM; \ + \ + *xs = invalid; \ + \ + FOREACH_WORD(word, l, rvalue, state) { \ + _cleanup_free_ char *en = NULL; \ + type *new_xs; \ + \ + en = strndup(word, l); \ + if (!en) \ + return -ENOMEM; \ + \ + if ((x = name##_from_string(en)) < 0) { \ + log_syntax(unit, LOG_ERR, filename, line, \ + -x, msg ", ignoring: %s", en); \ + continue; \ + } \ + \ + for (ys = xs; x != invalid && *ys != invalid; ys++) { \ + if (*ys == x) { \ + log_syntax(unit, LOG_ERR, filename, \ + line, -x, \ + "Duplicate entry, ignoring: %s", \ + en); \ + x = invalid; \ + } \ + } \ + \ + if (x == invalid) \ + continue; \ + \ + *(xs + i) = x; \ + new_xs = realloc(xs, (++i + 1) * sizeof(type)); \ + if (new_xs) \ + xs = new_xs; \ + else \ + return -ENOMEM; \ + \ + *(xs + i) = invalid; \ + } \ + \ + free(*enums); \ + *enums = xs; \ + xs = NULL; \ + \ + return 0; \ + } |