diff options
Diffstat (limited to 'src/shared/conf-parser.h')
| -rw-r--r-- | src/shared/conf-parser.h | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/src/shared/conf-parser.h b/src/shared/conf-parser.h new file mode 100644 index 0000000..71107d7 --- /dev/null +++ b/src/shared/conf-parser.h @@ -0,0 +1,373 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <errno.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdio.h> +#include <syslog.h> +#include <sys/stat.h> + +#include "alloc-util.h" +#include "hashmap.h" +#include "log.h" +#include "macro.h" +#include "time-util.h" + +/* An abstract parser for simple, line based, shallow configuration files consisting of variable assignments only. */ + +typedef enum ConfigParseFlags { + CONFIG_PARSE_RELAXED = 1 << 0, /* Do not warn about unknown non-extension fields */ + CONFIG_PARSE_WARN = 1 << 1, /* Emit non-debug messages */ +} ConfigParseFlags; + +/* Argument list for parsers of specific configuration settings. */ +#define CONFIG_PARSER_ARGUMENTS \ + 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 + +/* Prototype for a parser for a specific configuration setting */ +typedef int (*ConfigParserCallback)(CONFIG_PARSER_ARGUMENTS); + +/* A macro declaring a function prototype, following the typedef above, simply because it's so cumbersomely long + * otherwise. (And current emacs gets irritatingly slow when editing files that contain lots of very long function + * prototypes on the same screen…) */ +#define CONFIG_PARSER_PROTOTYPE(name) int name(CONFIG_PARSER_ARGUMENTS) + +/* 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, GPERF_LEN_TYPE length); + +/* Prototype for a generic high-level lookup function */ +typedef int (*ConfigItemLookup)( + const void *table, + const char *section, + const char *lvalue, + ConfigParserCallback *ret_func, + int *ret_ltype, + void **ret_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 *ret_func, int *ret_ltype, void **ret_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 *ret_func, int *ret_ltype, void **ret_data, void *userdata); + +int config_parse( + const char *unit, + const char *filename, + FILE *f, + const char *sections, /* nulstr */ + ConfigItemLookup lookup, + const void *table, + ConfigParseFlags flags, + void *userdata, + struct stat *ret_stat); /* possibly NULL */ + +int config_parse_many_nulstr( + const char *conf_file, /* possibly NULL */ + const char *conf_file_dirs, /* nulstr */ + const char *sections, /* nulstr */ + ConfigItemLookup lookup, + const void *table, + ConfigParseFlags flags, + void *userdata, + Hashmap **ret_stats_by_path); /* possibly NULL */ + +int config_parse_many( + const char* const* conf_files, /* possibly empty */ + const char* const* conf_file_dirs, + const char *dropin_dirname, + const char *sections, /* nulstr */ + ConfigItemLookup lookup, + const void *table, + ConfigParseFlags flags, + void *userdata, + Hashmap **ret_stats_by_path, /* possibly NULL */ + char ***ret_drop_in_files); /* possibly NULL */ + +int config_get_stats_by_path( + const char *suffix, + const char *root, + unsigned flags, + const char* const* dirs, + bool check_dropins, + Hashmap **ret); + +int hashmap_put_stats_by_path(Hashmap **stats_by_path, const char *path, const struct stat *st); +bool stats_by_path_equal(Hashmap *a, Hashmap *b); + +typedef struct ConfigSection { + unsigned line; + bool invalid; + char filename[]; +} ConfigSection; + +static inline ConfigSection* config_section_free(ConfigSection *cs) { + return mfree(cs); +} +DEFINE_TRIVIAL_CLEANUP_FUNC(ConfigSection*, config_section_free); + +int config_section_new(const char *filename, unsigned line, ConfigSection **s); +extern const struct hash_ops config_section_hash_ops; +unsigned hashmap_find_free_section_line(Hashmap *hashmap); + +static inline bool section_is_invalid(ConfigSection *section) { + /* If this returns false, then it does _not_ mean the section is valid. */ + + if (!section) + return false; + + return section->invalid; +} + +#define DEFINE_SECTION_CLEANUP_FUNCTIONS(type, free_func) \ + static inline type* free_func##_or_set_invalid(type *p) { \ + assert(p); \ + \ + if (p->section) \ + p->section->invalid = true; \ + else \ + free_func(p); \ + return NULL; \ + } \ + DEFINE_TRIVIAL_CLEANUP_FUNC(type*, free_func); \ + DEFINE_TRIVIAL_CLEANUP_FUNC(type*, free_func##_or_set_invalid); + +CONFIG_PARSER_PROTOTYPE(config_parse_int); +CONFIG_PARSER_PROTOTYPE(config_parse_unsigned); +CONFIG_PARSER_PROTOTYPE(config_parse_long); +CONFIG_PARSER_PROTOTYPE(config_parse_uint8); +CONFIG_PARSER_PROTOTYPE(config_parse_uint16); +CONFIG_PARSER_PROTOTYPE(config_parse_uint32); +CONFIG_PARSER_PROTOTYPE(config_parse_int32); +CONFIG_PARSER_PROTOTYPE(config_parse_uint64); +CONFIG_PARSER_PROTOTYPE(config_parse_double); +CONFIG_PARSER_PROTOTYPE(config_parse_iec_size); +CONFIG_PARSER_PROTOTYPE(config_parse_si_uint64); +CONFIG_PARSER_PROTOTYPE(config_parse_iec_uint64); +CONFIG_PARSER_PROTOTYPE(config_parse_iec_uint64_infinity); +CONFIG_PARSER_PROTOTYPE(config_parse_bool); +CONFIG_PARSER_PROTOTYPE(config_parse_id128); +CONFIG_PARSER_PROTOTYPE(config_parse_tristate); +CONFIG_PARSER_PROTOTYPE(config_parse_string); +CONFIG_PARSER_PROTOTYPE(config_parse_dns_name); +CONFIG_PARSER_PROTOTYPE(config_parse_hostname); +CONFIG_PARSER_PROTOTYPE(config_parse_path); +CONFIG_PARSER_PROTOTYPE(config_parse_strv); +CONFIG_PARSER_PROTOTYPE(config_parse_sec); +CONFIG_PARSER_PROTOTYPE(config_parse_sec_def_infinity); +CONFIG_PARSER_PROTOTYPE(config_parse_sec_def_unset); +CONFIG_PARSER_PROTOTYPE(config_parse_nsec); +CONFIG_PARSER_PROTOTYPE(config_parse_mode); +CONFIG_PARSER_PROTOTYPE(config_parse_warn_compat); +CONFIG_PARSER_PROTOTYPE(config_parse_log_facility); +CONFIG_PARSER_PROTOTYPE(config_parse_log_level); +CONFIG_PARSER_PROTOTYPE(config_parse_signal); +CONFIG_PARSER_PROTOTYPE(config_parse_personality); +CONFIG_PARSER_PROTOTYPE(config_parse_permille); +CONFIG_PARSER_PROTOTYPE(config_parse_ifname); +CONFIG_PARSER_PROTOTYPE(config_parse_ifnames); +CONFIG_PARSER_PROTOTYPE(config_parse_ip_port); +CONFIG_PARSER_PROTOTYPE(config_parse_mtu); +CONFIG_PARSER_PROTOTYPE(config_parse_rlimit); +CONFIG_PARSER_PROTOTYPE(config_parse_vlanprotocol); +CONFIG_PARSER_PROTOTYPE(config_parse_hw_addr); +CONFIG_PARSER_PROTOTYPE(config_parse_hw_addrs); +CONFIG_PARSER_PROTOTYPE(config_parse_ether_addr); +CONFIG_PARSER_PROTOTYPE(config_parse_ether_addrs); +CONFIG_PARSER_PROTOTYPE(config_parse_in_addr_non_null); +CONFIG_PARSER_PROTOTYPE(config_parse_percent); +CONFIG_PARSER_PROTOTYPE(config_parse_permyriad); +CONFIG_PARSER_PROTOTYPE(config_parse_pid); +CONFIG_PARSER_PROTOTYPE(config_parse_sec_fix_0); + +typedef enum Disabled { + DISABLED_CONFIGURATION, + DISABLED_LEGACY, + DISABLED_EXPERIMENTAL, +} Disabled; + +typedef enum ConfigParseStringFlags { + CONFIG_PARSE_STRING_SAFE = 1 << 0, + CONFIG_PARSE_STRING_ASCII = 1 << 1, + + CONFIG_PARSE_STRING_SAFE_AND_ASCII = CONFIG_PARSE_STRING_SAFE | CONFIG_PARSE_STRING_ASCII, +} ConfigParseStringFlags; + +#define DEFINE_CONFIG_PARSE(function, parser, msg) \ + CONFIG_PARSER_PROTOTYPE(function) { \ + int *i = data, r; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + assert(data); \ + \ + r = parser(rvalue); \ + if (r < 0) { \ + log_syntax(unit, LOG_WARNING, filename, line, r, \ + msg ", ignoring: %s", rvalue); \ + return 0; \ + } \ + \ + *i = r; \ + return 0; \ + } + +#define DEFINE_CONFIG_PARSE_PTR(function, parser, type, msg) \ + CONFIG_PARSER_PROTOTYPE(function) { \ + type *i = ASSERT_PTR(data); \ + int r; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + \ + r = parser(rvalue, i); \ + if (r < 0) \ + log_syntax(unit, LOG_WARNING, filename, line, r, \ + msg ", ignoring: %s", rvalue); \ + \ + return 0; \ + } + +#define DEFINE_CONFIG_PARSE_ENUM_FULL(function, from_string, type, msg) \ + CONFIG_PARSER_PROTOTYPE(function) { \ + type *i = data, x; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + assert(data); \ + \ + x = from_string(rvalue); \ + if (x < 0) { \ + log_syntax(unit, LOG_WARNING, filename, line, x, \ + msg ", ignoring: %s", rvalue); \ + return 0; \ + } \ + \ + *i = x; \ + return 0; \ + } + +#define DEFINE_CONFIG_PARSE_ENUM(function, name, type, msg) \ + DEFINE_CONFIG_PARSE_ENUM_FULL(function, name##_from_string, type, msg) + +#define DEFINE_CONFIG_PARSE_ENUM_WITH_DEFAULT(function, name, type, default_value, msg) \ + CONFIG_PARSER_PROTOTYPE(function) { \ + type *i = data, x; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + assert(data); \ + \ + if (isempty(rvalue)) { \ + *i = default_value; \ + return 0; \ + } \ + \ + x = name##_from_string(rvalue); \ + if (x < 0) { \ + log_syntax(unit, LOG_WARNING, filename, line, x, \ + msg ", ignoring: %s", rvalue); \ + return 0; \ + } \ + \ + *i = x; \ + return 0; \ + } + +#define DEFINE_CONFIG_PARSE_ENUMV(function, name, type, invalid, msg) \ + CONFIG_PARSER_PROTOTYPE(function) { \ + type **enums = ASSERT_PTR(data); \ + _cleanup_free_ type *xs = NULL; \ + size_t i = 0; \ + int r; \ + \ + assert(filename); \ + assert(lvalue); \ + assert(rvalue); \ + \ + xs = new0(type, 1); \ + if (!xs) \ + return -ENOMEM; \ + \ + *xs = invalid; \ + \ + for (const char *p = rvalue;;) { \ + _cleanup_free_ char *en = NULL; \ + type x, *new_xs; \ + \ + r = extract_first_word(&p, &en, NULL, 0); \ + if (r == -ENOMEM) \ + return log_oom(); \ + if (r < 0) { \ + log_syntax(unit, LOG_WARNING, filename, line, r, \ + msg ", ignoring: %s", en); \ + return 0; \ + } \ + if (r == 0) \ + break; \ + \ + x = name##_from_string(en); \ + if (x < 0) { \ + log_syntax(unit, LOG_WARNING, filename, line, x, \ + msg ", ignoring: %s", en); \ + continue; \ + } \ + \ + for (type *ys = xs; x != invalid && *ys != invalid; ys++) \ + if (*ys == x) { \ + log_syntax(unit, LOG_NOTICE, filename, line, 0, \ + "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 log_oom(); \ + \ + *(xs + i) = invalid; \ + } \ + \ + return free_and_replace(*enums, xs); \ + } |