| 1 | /* |
| 2 | * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <config.h> |
| 21 | #include <ctype.h> |
| 22 | #include <errno.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | |
| 27 | #include <common/defaults.h> |
| 28 | #include <common/error.h> |
| 29 | #include <common/macros.h> |
| 30 | #include <common/utils.h> |
| 31 | |
| 32 | #include "config.h" |
| 33 | |
| 34 | struct handler_filter_args { |
| 35 | const char* section; |
| 36 | config_entry_handler_cb handler; |
| 37 | void *user_data; |
| 38 | }; |
| 39 | |
| 40 | const char * const config_str_yes = "yes"; |
| 41 | const char * const config_str_true = "true"; |
| 42 | const char * const config_str_on = "on"; |
| 43 | const char * const config_str_no = "no"; |
| 44 | const char * const config_str_false = "false"; |
| 45 | const char * const config_str_off = "off"; |
| 46 | |
| 47 | static int config_entry_handler_filter(struct handler_filter_args *args, |
| 48 | const char *section, const char *name, const char *value) |
| 49 | { |
| 50 | int ret = 0; |
| 51 | struct config_entry entry = { section, name, value }; |
| 52 | |
| 53 | assert(args); |
| 54 | |
| 55 | if (!section || !name || !value) { |
| 56 | ret = -EIO; |
| 57 | goto end; |
| 58 | } |
| 59 | |
| 60 | if (args->section) { |
| 61 | if (strcmp(args->section, section)) { |
| 62 | goto end; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | ret = args->handler(&entry, args->user_data); |
| 67 | end: |
| 68 | return ret; |
| 69 | } |
| 70 | |
| 71 | LTTNG_HIDDEN |
| 72 | int config_get_section_entries(const char *override_path, const char *section, |
| 73 | config_entry_handler_cb handler, void *user_data) |
| 74 | { |
| 75 | int ret = 0; |
| 76 | FILE *config_file = NULL; |
| 77 | struct handler_filter_args filter = { section, handler, user_data }; |
| 78 | |
| 79 | if (override_path) { |
| 80 | config_file = fopen(override_path, "r"); |
| 81 | if (config_file) { |
| 82 | DBG("Loaded daemon configuration file at %s", |
| 83 | override_path); |
| 84 | } else { |
| 85 | ERR("Failed to open daemon configuration file at %s", |
| 86 | override_path); |
| 87 | ret = -ENOENT; |
| 88 | goto end; |
| 89 | } |
| 90 | } else { |
| 91 | char *path = utils_get_home_dir(); |
| 92 | |
| 93 | /* Try to open the user's daemon configuration file */ |
| 94 | if (path) { |
| 95 | ret = asprintf(&path, DEFAULT_DAEMON_HOME_CONFIGPATH, path); |
| 96 | if (ret < 0) { |
| 97 | goto end; |
| 98 | } |
| 99 | |
| 100 | ret = 0; |
| 101 | config_file = fopen(path, "r"); |
| 102 | if (config_file) { |
| 103 | DBG("Loaded daemon configuration file at %s", path); |
| 104 | } |
| 105 | |
| 106 | free(path); |
| 107 | } |
| 108 | |
| 109 | /* Try to open the system daemon configuration file */ |
| 110 | if (!config_file) { |
| 111 | config_file = fopen(DEFAULT_DAEMON_HOME_CONFIGPATH, "r"); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | if (!config_file) { |
| 116 | DBG("No daemon configuration file found."); |
| 117 | goto end; |
| 118 | } |
| 119 | |
| 120 | ret = ini_parse_file(config_file, |
| 121 | (ini_entry_handler) config_entry_handler_filter, (void *) &filter); |
| 122 | |
| 123 | end: |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | LTTNG_HIDDEN |
| 128 | int config_parse_value(const char *value) |
| 129 | { |
| 130 | int i, ret = 0; |
| 131 | char *endptr, *lower_str; |
| 132 | size_t len; |
| 133 | unsigned long v; |
| 134 | |
| 135 | len = strlen(value); |
| 136 | if (!len) { |
| 137 | ret = -1; |
| 138 | goto end; |
| 139 | } |
| 140 | |
| 141 | v = strtoul(value, &endptr, 10); |
| 142 | if (endptr != value) { |
| 143 | ret = v; |
| 144 | goto end; |
| 145 | } |
| 146 | |
| 147 | lower_str = zmalloc(len + 1); |
| 148 | if (!lower_str) { |
| 149 | PERROR("zmalloc"); |
| 150 | ret = -errno; |
| 151 | goto end; |
| 152 | } |
| 153 | |
| 154 | for (i = 0; i < len; i++) { |
| 155 | lower_str[i] = tolower(value[i]); |
| 156 | } |
| 157 | |
| 158 | if (!strcmp(lower_str, config_str_yes) || |
| 159 | !strcmp(lower_str, config_str_true) || |
| 160 | !strcmp(lower_str, config_str_on)) { |
| 161 | ret = 1; |
| 162 | } else if (!strcmp(lower_str, config_str_no) || |
| 163 | !strcmp(lower_str, config_str_false) || |
| 164 | !strcmp(lower_str, config_str_off)) { |
| 165 | ret = 0; |
| 166 | } else { |
| 167 | ret = -1; |
| 168 | } |
| 169 | |
| 170 | free(lower_str); |
| 171 | end: |
| 172 | return ret; |
| 173 | } |