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f3ed775e DG |
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 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
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 | ||
beb8c75a | 28 | #include "conf.h" |
f3ed775e DG |
29 | #include "lttngerr.h" |
30 | ||
31 | /* | |
32 | * get_config_file_path | |
33 | * | |
34 | * Return the path with '/CONFIG_FILENAME' added to it. | |
35 | */ | |
36 | static char *get_config_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 = get_config_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 | * create_config_dir | |
102 | * | |
103 | * Create the empty config dir. | |
104 | */ | |
105 | static int create_config_dir(char *path) | |
106 | { | |
107 | int ret; | |
108 | ||
109 | /* Create session directory .lttng */ | |
110 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); | |
111 | if (ret < 0) { | |
112 | if (errno == EEXIST) { | |
113 | ERR("Session already exist at %s", path); | |
114 | } else { | |
115 | perror("mkdir config"); | |
116 | ERR("Couldn't init config directory at %s", path); | |
117 | } | |
118 | ret = -errno; | |
119 | goto error; | |
120 | } | |
121 | ||
122 | error: | |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
127 | * write_config | |
128 | * | |
129 | * Append data to the config file in file_path | |
130 | */ | |
131 | static void write_config(char *file_path, size_t size, char *data) | |
132 | { | |
133 | FILE *fp; | |
134 | ||
135 | fp = open_config(file_path, "a"); | |
136 | if (fp == NULL) { | |
137 | goto error; | |
138 | } | |
139 | ||
140 | /* Write session name into config file */ | |
141 | fwrite(data, size, 1, fp); | |
142 | fclose(fp); | |
143 | ||
144 | error: | |
145 | return; | |
146 | } | |
147 | ||
148 | /* | |
149 | * config_get_default_path | |
150 | * | |
151 | * Return the default path to config directory which is the current working | |
152 | * directory. User must free() the returned allocated string. | |
153 | */ | |
154 | char *config_get_default_path(void) | |
155 | { | |
156 | char *alloc_path; | |
157 | ||
158 | alloc_path = getcwd(NULL, 0); | |
159 | if (alloc_path == NULL) { | |
160 | perror("getcwd"); | |
161 | } | |
162 | ||
163 | return alloc_path; | |
164 | } | |
165 | ||
166 | /* | |
167 | * config_destroy | |
168 | * | |
169 | * Destroy directory config and file config. | |
170 | */ | |
171 | void config_destroy(char *path) | |
172 | { | |
173 | int ret; | |
174 | char *config_path; | |
175 | ||
176 | config_path = get_config_file_path(path); | |
177 | ||
178 | ret = remove(config_path); | |
179 | if (ret < 0) { | |
180 | perror("remove config file"); | |
181 | } | |
182 | ||
183 | ret = rmdir(path); | |
184 | if (ret < 0) { | |
185 | perror("rmdir config dir"); | |
186 | } | |
187 | ||
188 | free(config_path); | |
189 | } | |
190 | ||
191 | /* | |
192 | * config_read_session_name | |
193 | * | |
194 | * Return sesson name from the config file. | |
195 | */ | |
196 | char *config_read_session_name(char *path) | |
197 | { | |
198 | int ret; | |
199 | FILE *fp; | |
200 | char var[NAME_MAX], *session_name; | |
201 | ||
202 | fp = open_config(path, "r"); | |
203 | if (fp == NULL) { | |
204 | ERR("Can't find valid lttng config in %s", path); | |
205 | goto error; | |
206 | } | |
207 | ||
208 | session_name = malloc(NAME_MAX); | |
209 | while (!feof(fp)) { | |
210 | if ((ret = fscanf(fp, "%[^'=']=%s\n", var, session_name)) != 2) { | |
211 | if (ret == -1) { | |
212 | ERR("Missing session=NAME in config file."); | |
213 | goto error; | |
214 | } | |
215 | continue; | |
216 | } | |
217 | ||
218 | if (strcmp(var, "session") == 0) { | |
219 | goto found; | |
220 | } | |
221 | } | |
222 | ||
223 | fclose(fp); | |
224 | ||
225 | error: | |
226 | return NULL; | |
227 | ||
228 | found: | |
229 | fclose(fp); | |
230 | return session_name; | |
231 | ||
232 | } | |
233 | ||
234 | /* | |
235 | * config_add_session_name | |
236 | * | |
237 | * Write session name option to the config file. | |
238 | */ | |
239 | int config_add_session_name(char *path, char *name) | |
240 | { | |
241 | int ret; | |
242 | char session_name[NAME_MAX]; | |
243 | ||
244 | ret = snprintf(session_name, NAME_MAX, "session=%s\n", name); | |
245 | if (ret < 0) { | |
246 | goto error; | |
247 | } | |
248 | ||
249 | write_config(path, ret, session_name); | |
250 | ret = 0; | |
251 | ||
252 | error: | |
253 | return ret; | |
254 | } | |
255 | ||
256 | /* | |
257 | * config_generate_dir_path | |
258 | * | |
259 | * Return allocated path string to path/CONFIG_DIRNAME. | |
260 | */ | |
261 | char *config_generate_dir_path(char *path) | |
262 | { | |
263 | int ret; | |
264 | char *new_path; | |
265 | ||
266 | ret = asprintf(&new_path, "%s/%s", path, CONFIG_DIRNAME); | |
267 | if (ret < 0) { | |
268 | perror("config path problem"); | |
269 | goto error; | |
270 | } | |
271 | ||
272 | error: | |
273 | return new_path; | |
274 | } | |
275 | ||
276 | /* | |
277 | * config_init | |
278 | * | |
279 | * Init configuration directory and file. | |
280 | */ | |
281 | int config_init(char *path) | |
282 | { | |
283 | int ret; | |
284 | ||
285 | /* Create config directory (.lttng) */ | |
286 | ret = create_config_dir(path); | |
287 | if (ret < 0) { | |
288 | goto error; | |
289 | } | |
290 | ||
291 | /* Create default config file */ | |
292 | ret = create_config_file(path); | |
293 | if (ret < 0) { | |
294 | goto error; | |
295 | } | |
296 | ||
297 | DBG("Init config session in %s", path); | |
298 | ||
299 | error: | |
300 | return ret; | |
301 | } |