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7c2ab358 LDM |
1 | /* |
2 | * libkmod - interface to kernel module operations | |
3 | * | |
4 | * Copyright (C) 2011 ProFUSION embedded systems | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation version 2.1. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <stddef.h> | |
23 | #include <stdarg.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <string.h> | |
27 | #include <ctype.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
30 | #include <dirent.h> | |
31 | ||
32 | #include "libkmod.h" | |
33 | #include "libkmod-private.h" | |
34 | ||
35 | static const char *config_files[] = { | |
36 | "/run/modprobe.d", | |
37 | "/etc/modprobe.d", | |
7c2ab358 LDM |
38 | "/lib/modprobe.d", |
39 | }; | |
40 | ||
41 | struct kmod_alias { | |
42 | char *name; | |
43c29d10 | 43 | char modname[]; |
7c2ab358 LDM |
44 | }; |
45 | ||
b0ef19f7 | 46 | const char *kmod_alias_get_name(const struct kmod_list *l) { |
1ce08a56 | 47 | const struct kmod_alias *alias = l->data; |
b0ef19f7 LDM |
48 | return alias->name; |
49 | } | |
50 | ||
51 | const char *kmod_alias_get_modname(const struct kmod_list *l) { | |
1ce08a56 | 52 | const struct kmod_alias *alias = l->data; |
b0ef19f7 LDM |
53 | return alias->modname; |
54 | } | |
55 | ||
d13e606f GSB |
56 | static int kmod_config_add_alias(struct kmod_config *config, |
57 | const char *name, const char *modname) | |
7c2ab358 LDM |
58 | { |
59 | struct kmod_alias *alias; | |
d13e606f | 60 | struct kmod_list *list; |
43c29d10 | 61 | size_t namelen = strlen(name) + 1, modnamelen = strlen(modname) + 1; |
7c2ab358 | 62 | |
d13e606f | 63 | DBG(config->ctx, "name=%s modname=%s\n", name, modname); |
7c2ab358 | 64 | |
43c29d10 | 65 | alias = malloc(sizeof(*alias) + namelen + modnamelen); |
d13e606f GSB |
66 | if (!alias) |
67 | goto oom_error_init; | |
43c29d10 GSB |
68 | alias->name = sizeof(*alias) + modnamelen + (char *)alias; |
69 | ||
70 | memcpy(alias->modname, modname, modnamelen); | |
71 | memcpy(alias->name, name, namelen); | |
7c2ab358 | 72 | |
d13e606f GSB |
73 | list = kmod_list_append(config->aliases, alias); |
74 | if (!list) | |
75 | goto oom_error; | |
76 | config->aliases = list; | |
77 | return 0; | |
78 | ||
79 | oom_error: | |
d13e606f GSB |
80 | free(alias); |
81 | oom_error_init: | |
82 | ERR(config->ctx, "out-of-memory name=%s modname=%s\n", name, modname); | |
83 | return -ENOMEM; | |
7c2ab358 LDM |
84 | } |
85 | ||
d13e606f | 86 | static void kmod_config_free_alias(struct kmod_config *config, struct kmod_list *l) |
7c2ab358 LDM |
87 | { |
88 | struct kmod_alias *alias = l->data; | |
89 | ||
7c2ab358 LDM |
90 | free(alias); |
91 | ||
d13e606f | 92 | config->aliases = kmod_list_remove(l); |
7c2ab358 LDM |
93 | } |
94 | ||
d13e606f | 95 | static int kmod_config_add_blacklist(struct kmod_config *config, |
81cf2060 LDM |
96 | const char *modname) |
97 | { | |
81cf2060 | 98 | char *p; |
d13e606f | 99 | struct kmod_list *list; |
81cf2060 | 100 | |
d13e606f | 101 | DBG(config->ctx, "modname=%s\n", modname); |
81cf2060 LDM |
102 | |
103 | p = strdup(modname); | |
d13e606f GSB |
104 | if (!p) |
105 | goto oom_error_init; | |
106 | ||
107 | list = kmod_list_append(config->blacklists, p); | |
108 | if (!list) | |
109 | goto oom_error; | |
110 | config->blacklists = list; | |
111 | return 0; | |
81cf2060 | 112 | |
d13e606f GSB |
113 | oom_error: |
114 | free(p); | |
115 | oom_error_init: | |
116 | ERR(config->ctx, "out-of-memory modname=%s\n", modname); | |
117 | return -ENOMEM; | |
81cf2060 LDM |
118 | } |
119 | ||
d13e606f | 120 | static void kmod_config_free_blacklist(struct kmod_config *config, |
81cf2060 LDM |
121 | struct kmod_list *l) |
122 | { | |
123 | free(l->data); | |
d13e606f | 124 | config->blacklists = kmod_list_remove(l); |
81cf2060 LDM |
125 | } |
126 | ||
d13e606f | 127 | static int kmod_config_parse(struct kmod_config *config, const char *filename) |
7c2ab358 | 128 | { |
d13e606f | 129 | struct kmod_ctx *ctx = config->ctx; |
7c2ab358 LDM |
130 | char *line; |
131 | FILE *fp; | |
132 | unsigned int linenum; | |
133 | ||
134 | DBG(ctx, "%s\n", filename); | |
135 | ||
136 | fp = fopen(filename, "r"); | |
137 | if (fp == NULL) | |
138 | return errno; | |
139 | ||
140 | while ((line = getline_wrapped(fp, &linenum)) != NULL) { | |
c11e62bf | 141 | char *cmd, *saveptr; |
7c2ab358 LDM |
142 | |
143 | if (line[0] == '\0' || line[0] == '#') | |
144 | goto done_next; | |
145 | ||
c11e62bf | 146 | cmd = strtok_r(line, "\t ", &saveptr); |
7c2ab358 LDM |
147 | if (cmd == NULL) |
148 | goto done_next; | |
149 | ||
150 | if (!strcmp(cmd, "alias")) { | |
c11e62bf LDM |
151 | char *alias = strtok_r(NULL, "\t ", &saveptr); |
152 | char *modname = strtok_r(NULL, "\t ", &saveptr); | |
7c2ab358 LDM |
153 | |
154 | if (alias == NULL || modname == NULL) | |
155 | goto syntax_error; | |
156 | ||
d13e606f | 157 | kmod_config_add_alias(config, |
30be7513 LDM |
158 | underscores(ctx, alias), |
159 | underscores(ctx, modname)); | |
81cf2060 | 160 | } else if (!strcmp(cmd, "blacklist")) { |
c11e62bf | 161 | char *modname = strtok_r(NULL, "\t ", &saveptr); |
81cf2060 LDM |
162 | |
163 | if (modname == NULL) | |
164 | goto syntax_error; | |
165 | ||
d13e606f | 166 | kmod_config_add_blacklist(config, |
2295acc5 | 167 | underscores(ctx, modname)); |
7c2ab358 LDM |
168 | } else if (!strcmp(cmd, "include") || !strcmp(cmd, "options") |
169 | || !strcmp(cmd, "install") | |
7c2ab358 LDM |
170 | || !strcmp(cmd, "remove") |
171 | || !strcmp(cmd, "softdep") | |
172 | || !strcmp(cmd, "config")) { | |
81cf2060 LDM |
173 | INFO(ctx, "%s: command %s not implemented yet\n", |
174 | filename, cmd); | |
7c2ab358 LDM |
175 | } else { |
176 | syntax_error: | |
177 | ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n", | |
178 | filename, linenum, cmd); | |
179 | } | |
180 | ||
181 | done_next: | |
182 | free(line); | |
183 | } | |
184 | ||
185 | fclose(fp); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
d13e606f | 190 | void kmod_config_free(struct kmod_config *config) |
7c2ab358 LDM |
191 | { |
192 | while (config->aliases) | |
d13e606f | 193 | kmod_config_free_alias(config, config->aliases); |
81cf2060 LDM |
194 | |
195 | while (config->blacklists) | |
d13e606f GSB |
196 | kmod_config_free_blacklist(config, config->blacklists); |
197 | ||
198 | free(config); | |
7c2ab358 LDM |
199 | } |
200 | ||
201 | static bool conf_files_filter(struct kmod_ctx *ctx, const char *path, | |
202 | const char *fn) | |
203 | { | |
204 | size_t len = strlen(fn); | |
205 | ||
206 | if (fn[0] == '.') | |
207 | return 1; | |
208 | ||
209 | if (len < 6 || (strcmp(&fn[len - 5], ".conf") != 0 | |
210 | && strcmp(&fn[len - 6], ".alias"))) { | |
211 | INFO(ctx, "All config files need .conf: %s/%s, " | |
212 | "it will be ignored in a future release\n", | |
213 | path, fn); | |
214 | return 1; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list, | |
221 | const char *path, size_t *n) | |
222 | { | |
223 | struct stat st; | |
224 | DIR *d; | |
225 | int err; | |
226 | ||
227 | if (stat(path, &st) < 0) | |
228 | return -ENOENT; | |
229 | ||
230 | if (!S_ISDIR(st.st_mode)) { | |
231 | *list = kmod_list_append(*list, (void *)path); | |
232 | *n += 1; | |
233 | return 0; | |
234 | } | |
235 | ||
236 | d = opendir(path); | |
237 | if (d == NULL) { | |
238 | err = errno; | |
239 | ERR(ctx, "%m\n"); | |
240 | return -errno; | |
241 | } | |
242 | ||
243 | for (;;) { | |
244 | struct dirent ent, *entp; | |
245 | char *p; | |
246 | ||
247 | err = readdir_r(d, &ent, &entp); | |
248 | if (err != 0) { | |
249 | err = -err; | |
250 | goto finish; | |
251 | } | |
252 | ||
253 | if (entp == NULL) | |
254 | break; | |
255 | ||
256 | if (conf_files_filter(ctx, path, entp->d_name) == 1) | |
257 | continue; | |
258 | ||
259 | if (asprintf(&p, "%s/%s", path, entp->d_name) < 0) { | |
260 | err = -ENOMEM; | |
261 | goto finish; | |
262 | } | |
263 | ||
264 | DBG(ctx, "%s\n", p); | |
265 | ||
266 | *list = kmod_list_append(*list, p); | |
267 | *n += 1; | |
268 | } | |
269 | ||
270 | finish: | |
271 | closedir(d); | |
272 | return err; | |
273 | } | |
274 | ||
275 | static int base_cmp(const void *a, const void *b) | |
276 | { | |
277 | const char *s1, *s2; | |
278 | ||
279 | s1 = *(char * const *)a; | |
280 | s2 = *(char * const *)b; | |
281 | ||
282 | return strcmp(basename(s1), basename(s2)); | |
283 | } | |
284 | ||
d13e606f | 285 | int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config) |
7c2ab358 | 286 | { |
d13e606f | 287 | struct kmod_config *config; |
7c2ab358 | 288 | size_t i, n = 0; |
1ce08a56 | 289 | const char **files; |
7c2ab358 LDM |
290 | int err = 0; |
291 | struct kmod_list *list = NULL, *l; | |
292 | ||
d13e606f | 293 | *p_config = config = calloc(1, sizeof(struct kmod_config)); |
2295acc5 | 294 | if (config == NULL) |
d13e606f | 295 | return -ENOMEM; |
2295acc5 | 296 | |
d13e606f GSB |
297 | config->ctx = ctx; |
298 | ||
7c2ab358 LDM |
299 | for (i = 0; i < ARRAY_SIZE(config_files); i++) |
300 | conf_files_list(ctx, &list, config_files[i], &n); | |
301 | ||
302 | files = malloc(sizeof(char *) * n); | |
303 | if (files == NULL) { | |
304 | err = -ENOMEM; | |
305 | goto finish; | |
306 | } | |
307 | ||
308 | i = 0; | |
309 | kmod_list_foreach(l, list) { | |
310 | files[i] = l->data; | |
311 | i++; | |
312 | } | |
313 | ||
314 | qsort(files, n, sizeof(char *), base_cmp); | |
315 | ||
316 | for (i = 0; i < n; i++) | |
d13e606f | 317 | kmod_config_parse(config, files[i]); |
7c2ab358 LDM |
318 | |
319 | finish: | |
320 | free(files); | |
321 | ||
322 | while (list) { | |
323 | free(list->data); | |
324 | list = kmod_list_remove(list); | |
325 | } | |
326 | ||
327 | return err; | |
328 | } |