| 1 | /* |
| 2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * as published by the Free Software Foundation; only version 2 |
| 7 | * of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <limits.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #include "conf.h" |
| 29 | #include "lttngerr.h" |
| 30 | |
| 31 | /* |
| 32 | * config_get_file_path |
| 33 | * |
| 34 | * Return the path with '/CONFIG_FILENAME' added to it. |
| 35 | */ |
| 36 | char *config_get_file_path(char *path) |
| 37 | { |
| 38 | int ret; |
| 39 | char *file_path; |
| 40 | |
| 41 | ret = asprintf(&file_path, "%s/%s", path, CONFIG_FILENAME); |
| 42 | if (ret < 0) { |
| 43 | ERR("Fail allocating config file path"); |
| 44 | } |
| 45 | |
| 46 | return file_path; |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * open_config |
| 51 | * |
| 52 | * Return an open FILE pointer to the config file. |
| 53 | */ |
| 54 | static FILE *open_config(char *path, const char *mode) |
| 55 | { |
| 56 | FILE *fp = NULL; |
| 57 | char *file_path; |
| 58 | |
| 59 | file_path = config_get_file_path(path); |
| 60 | if (file_path == NULL) { |
| 61 | goto error; |
| 62 | } |
| 63 | |
| 64 | fp = fopen(file_path, mode); |
| 65 | if (fp == NULL) { |
| 66 | perror("config file"); |
| 67 | goto error; |
| 68 | } |
| 69 | |
| 70 | error: |
| 71 | if (file_path) { |
| 72 | free(file_path); |
| 73 | } |
| 74 | return fp; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * create_config_file |
| 79 | * |
| 80 | * Create the empty config file a the path. |
| 81 | */ |
| 82 | static int create_config_file(char *path) |
| 83 | { |
| 84 | int ret; |
| 85 | FILE *fp; |
| 86 | |
| 87 | fp = open_config(path, "w+"); |
| 88 | if (fp == NULL) { |
| 89 | ERR("Unable to create config file"); |
| 90 | ret = -1; |
| 91 | goto error; |
| 92 | } |
| 93 | |
| 94 | ret = fclose(fp); |
| 95 | |
| 96 | error: |
| 97 | return ret; |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * write_config |
| 102 | * |
| 103 | * Append data to the config file in file_path |
| 104 | */ |
| 105 | static int write_config(char *file_path, size_t size, char *data) |
| 106 | { |
| 107 | FILE *fp; |
| 108 | size_t len; |
| 109 | int ret = 0; |
| 110 | |
| 111 | fp = open_config(file_path, "a"); |
| 112 | if (fp == NULL) { |
| 113 | ret = -1; |
| 114 | goto end; |
| 115 | } |
| 116 | |
| 117 | /* Write session name into config file */ |
| 118 | len = fwrite(data, size, 1, fp); |
| 119 | if (len < 1) { |
| 120 | ret = -1; |
| 121 | } |
| 122 | fclose(fp); |
| 123 | end: |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * config_get_default_path |
| 129 | * |
| 130 | * Return the HOME directory path. Caller MUST NOT free(3) the return pointer. |
| 131 | */ |
| 132 | char *config_get_default_path(void) |
| 133 | { |
| 134 | return getenv("HOME"); |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * config_destroy |
| 139 | * |
| 140 | * Destroy directory config and file config. |
| 141 | */ |
| 142 | void config_destroy(char *path) |
| 143 | { |
| 144 | int ret; |
| 145 | char *config_path; |
| 146 | |
| 147 | config_path = config_get_file_path(path); |
| 148 | if (config_path == NULL) { |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | ret = remove(config_path); |
| 153 | if (ret < 0) { |
| 154 | perror("remove config file"); |
| 155 | } |
| 156 | |
| 157 | free(config_path); |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * config_read_session_name |
| 162 | * |
| 163 | * Return sesson name from the config file. |
| 164 | */ |
| 165 | char *config_read_session_name(char *path) |
| 166 | { |
| 167 | int ret; |
| 168 | FILE *fp; |
| 169 | char var[NAME_MAX], *session_name; |
| 170 | |
| 171 | fp = open_config(path, "r"); |
| 172 | if (fp == NULL) { |
| 173 | ERR("Can't find valid lttng config %s/.lttngrc", path); |
| 174 | goto error; |
| 175 | } |
| 176 | |
| 177 | session_name = malloc(NAME_MAX); |
| 178 | while (!feof(fp)) { |
| 179 | if ((ret = fscanf(fp, "%[^'=']=%s\n", var, session_name)) != 2) { |
| 180 | if (ret == -1) { |
| 181 | ERR("Missing session=NAME in config file."); |
| 182 | goto error; |
| 183 | } |
| 184 | continue; |
| 185 | } |
| 186 | |
| 187 | if (strcmp(var, "session") == 0) { |
| 188 | goto found; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | fclose(fp); |
| 193 | |
| 194 | error: |
| 195 | return NULL; |
| 196 | |
| 197 | found: |
| 198 | fclose(fp); |
| 199 | return session_name; |
| 200 | |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * config_add_session_name |
| 205 | * |
| 206 | * Write session name option to the config file. |
| 207 | */ |
| 208 | int config_add_session_name(char *path, char *name) |
| 209 | { |
| 210 | int ret; |
| 211 | char session_name[NAME_MAX]; |
| 212 | |
| 213 | ret = snprintf(session_name, NAME_MAX, "session=%s\n", name); |
| 214 | if (ret < 0) { |
| 215 | goto error; |
| 216 | } |
| 217 | ret = write_config(path, ret, session_name); |
| 218 | error: |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * config_init |
| 224 | * |
| 225 | * Init configuration directory and file. |
| 226 | */ |
| 227 | int config_init(char *session_name) |
| 228 | { |
| 229 | int ret; |
| 230 | char *path; |
| 231 | |
| 232 | path = config_get_default_path(); |
| 233 | if (path == NULL) { |
| 234 | ret = -1; |
| 235 | goto error; |
| 236 | } |
| 237 | |
| 238 | /* Create default config file */ |
| 239 | ret = create_config_file(path); |
| 240 | if (ret < 0) { |
| 241 | goto error; |
| 242 | } |
| 243 | |
| 244 | ret = config_add_session_name(path, session_name); |
| 245 | if (ret < 0) { |
| 246 | goto error; |
| 247 | } |
| 248 | |
| 249 | DBG("Init config session in %s", path); |
| 250 | |
| 251 | error: |
| 252 | return ret; |
| 253 | } |