Commit | Line | Data |
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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 | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
f3ed775e DG |
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 | ||
db758600 | 28 | #include <common/error.h> |
10a8a223 | 29 | |
beb8c75a | 30 | #include "conf.h" |
f3ed775e DG |
31 | |
32 | /* | |
58a97671 | 33 | * config_get_file_path |
f3ed775e | 34 | * |
27089920 TD |
35 | * Returns the path with '/CONFIG_FILENAME' added to it; |
36 | * path will be NULL if an error occurs. | |
f3ed775e | 37 | */ |
58a97671 | 38 | char *config_get_file_path(char *path) |
f3ed775e DG |
39 | { |
40 | int ret; | |
41 | char *file_path; | |
42 | ||
43 | ret = asprintf(&file_path, "%s/%s", path, CONFIG_FILENAME); | |
44 | if (ret < 0) { | |
45 | ERR("Fail allocating config file path"); | |
46 | } | |
47 | ||
48 | return file_path; | |
49 | } | |
50 | ||
51 | /* | |
52 | * open_config | |
53 | * | |
27089920 TD |
54 | * Returns an open FILE pointer to the config file; |
55 | * on error, NULL is returned. | |
f3ed775e DG |
56 | */ |
57 | static FILE *open_config(char *path, const char *mode) | |
58 | { | |
59 | FILE *fp = NULL; | |
60 | char *file_path; | |
61 | ||
58a97671 | 62 | file_path = config_get_file_path(path); |
f3ed775e DG |
63 | if (file_path == NULL) { |
64 | goto error; | |
65 | } | |
66 | ||
67 | fp = fopen(file_path, mode); | |
68 | if (fp == NULL) { | |
f3ed775e DG |
69 | goto error; |
70 | } | |
71 | ||
72 | error: | |
73 | if (file_path) { | |
74 | free(file_path); | |
75 | } | |
76 | return fp; | |
77 | } | |
78 | ||
79 | /* | |
80 | * create_config_file | |
81 | * | |
27089920 TD |
82 | * Creates the empty config file at the path. |
83 | * On success, returns 0; | |
84 | * on error, returns -1. | |
f3ed775e DG |
85 | */ |
86 | static int create_config_file(char *path) | |
87 | { | |
88 | int ret; | |
89 | FILE *fp; | |
90 | ||
91 | fp = open_config(path, "w+"); | |
92 | if (fp == NULL) { | |
93 | ERR("Unable to create config file"); | |
94 | ret = -1; | |
95 | goto error; | |
96 | } | |
97 | ||
98 | ret = fclose(fp); | |
99 | ||
100 | error: | |
101 | return ret; | |
102 | } | |
103 | ||
f3ed775e DG |
104 | /* |
105 | * write_config | |
106 | * | |
107 | * Append data to the config file in file_path | |
27089920 TD |
108 | * On success, returns 0; |
109 | * on error, returns -1. | |
f3ed775e | 110 | */ |
a079cd4d | 111 | static int write_config(char *file_path, size_t size, char *data) |
f3ed775e DG |
112 | { |
113 | FILE *fp; | |
a079cd4d MD |
114 | size_t len; |
115 | int ret = 0; | |
f3ed775e DG |
116 | |
117 | fp = open_config(file_path, "a"); | |
118 | if (fp == NULL) { | |
a079cd4d MD |
119 | ret = -1; |
120 | goto end; | |
f3ed775e DG |
121 | } |
122 | ||
123 | /* Write session name into config file */ | |
a079cd4d | 124 | len = fwrite(data, size, 1, fp); |
27089920 | 125 | if (len != 1) { |
a079cd4d MD |
126 | ret = -1; |
127 | } | |
f3ed775e | 128 | fclose(fp); |
a079cd4d MD |
129 | end: |
130 | return ret; | |
f3ed775e DG |
131 | } |
132 | ||
133 | /* | |
134 | * config_get_default_path | |
135 | * | |
27089920 | 136 | * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer. |
f3ed775e DG |
137 | */ |
138 | char *config_get_default_path(void) | |
139 | { | |
58a97671 | 140 | return getenv("HOME"); |
f3ed775e DG |
141 | } |
142 | ||
143 | /* | |
144 | * config_destroy | |
145 | * | |
27089920 | 146 | * Destroys directory config and file config. |
f3ed775e DG |
147 | */ |
148 | void config_destroy(char *path) | |
149 | { | |
150 | int ret; | |
151 | char *config_path; | |
152 | ||
58a97671 DG |
153 | config_path = config_get_file_path(path); |
154 | if (config_path == NULL) { | |
155 | return; | |
156 | } | |
f3ed775e DG |
157 | |
158 | ret = remove(config_path); | |
159 | if (ret < 0) { | |
160 | perror("remove config file"); | |
161 | } | |
162 | ||
f3ed775e DG |
163 | free(config_path); |
164 | } | |
165 | ||
166 | /* | |
167 | * config_read_session_name | |
168 | * | |
27089920 TD |
169 | * Returns the session name from the config file. |
170 | * The caller is responsible for freeing the returned string. | |
171 | * On error, NULL is returned. | |
f3ed775e DG |
172 | */ |
173 | char *config_read_session_name(char *path) | |
174 | { | |
175 | int ret; | |
176 | FILE *fp; | |
177 | char var[NAME_MAX], *session_name; | |
178 | ||
27089920 TD |
179 | session_name = malloc(NAME_MAX); |
180 | if (session_name == NULL) { | |
181 | ERR("Out of memory"); | |
182 | goto error; | |
183 | } | |
184 | ||
f3ed775e DG |
185 | fp = open_config(path, "r"); |
186 | if (fp == NULL) { | |
0d63dd19 | 187 | ERR("Can't find valid lttng config %s/.lttngrc", path); |
00f36863 | 188 | MSG("Did you create a session? (lttng create <my_session>)"); |
f3ed775e DG |
189 | goto error; |
190 | } | |
191 | ||
f3ed775e DG |
192 | while (!feof(fp)) { |
193 | if ((ret = fscanf(fp, "%[^'=']=%s\n", var, session_name)) != 2) { | |
194 | if (ret == -1) { | |
195 | ERR("Missing session=NAME in config file."); | |
00f36863 | 196 | goto error_close; |
f3ed775e DG |
197 | } |
198 | continue; | |
199 | } | |
200 | ||
201 | if (strcmp(var, "session") == 0) { | |
202 | goto found; | |
203 | } | |
204 | } | |
205 | ||
00f36863 | 206 | error_close: |
f3ed775e DG |
207 | fclose(fp); |
208 | ||
209 | error: | |
210 | return NULL; | |
211 | ||
212 | found: | |
213 | fclose(fp); | |
214 | return session_name; | |
215 | ||
216 | } | |
217 | ||
218 | /* | |
219 | * config_add_session_name | |
220 | * | |
221 | * Write session name option to the config file. | |
27089920 TD |
222 | * On success, returns 0; |
223 | * on error, returns -1. | |
f3ed775e DG |
224 | */ |
225 | int config_add_session_name(char *path, char *name) | |
226 | { | |
227 | int ret; | |
228 | char session_name[NAME_MAX]; | |
229 | ||
27089920 TD |
230 | /* |
231 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
232 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
233 | */ | |
f3ed775e | 234 | ret = snprintf(session_name, NAME_MAX, "session=%s\n", name); |
27089920 TD |
235 | if ((ret < 0) || (ret >= NAME_MAX)) { |
236 | ret = -1; | |
f3ed775e DG |
237 | goto error; |
238 | } | |
a079cd4d | 239 | ret = write_config(path, ret, session_name); |
f3ed775e DG |
240 | error: |
241 | return ret; | |
242 | } | |
243 | ||
f3ed775e DG |
244 | /* |
245 | * config_init | |
246 | * | |
247 | * Init configuration directory and file. | |
27089920 TD |
248 | * On success, returns 0; |
249 | * on error, returns -1. | |
f3ed775e | 250 | */ |
58a97671 | 251 | int config_init(char *session_name) |
f3ed775e DG |
252 | { |
253 | int ret; | |
58a97671 | 254 | char *path; |
f3ed775e | 255 | |
58a97671 DG |
256 | path = config_get_default_path(); |
257 | if (path == NULL) { | |
258 | ret = -1; | |
f3ed775e DG |
259 | goto error; |
260 | } | |
261 | ||
262 | /* Create default config file */ | |
263 | ret = create_config_file(path); | |
264 | if (ret < 0) { | |
265 | goto error; | |
266 | } | |
267 | ||
58a97671 DG |
268 | ret = config_add_session_name(path, session_name); |
269 | if (ret < 0) { | |
270 | goto error; | |
271 | } | |
272 | ||
f3ed775e DG |
273 | DBG("Init config session in %s", path); |
274 | ||
275 | error: | |
276 | return ret; | |
277 | } |