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8dfc8dbe | 1 | /* |
4061ab9f | 2 | * libudev - interface to udev device information |
8dfc8dbe | 3 | * |
28460195 | 4 | * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org> |
55e9959b | 5 | * |
4061ab9f KS |
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; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
8dfc8dbe GKH |
10 | */ |
11 | ||
8e41d35d DS |
12 | #include <stdlib.h> |
13 | #include <stdio.h> | |
8ea84a8a | 14 | #include <string.h> |
c81b35c0 | 15 | #include <stddef.h> |
28460195 | 16 | #include <stdbool.h> |
845d4751 | 17 | #include <unistd.h> |
8e41d35d DS |
18 | #include <fcntl.h> |
19 | #include <string.h> | |
34bb5d05 | 20 | #include <sys/stat.h> |
8e41d35d | 21 | |
44b49d37 KS |
22 | #include "libudev.h" |
23 | #include "libudev-private.h" | |
2b41e68a | 24 | |
c1dbe11d | 25 | static void udev_device_tag(struct udev_device *dev, const char *tag, bool add) |
28460195 | 26 | { |
912541b0 | 27 | const char *id; |
912541b0 KS |
28 | char filename[UTIL_PATH_SIZE]; |
29 | ||
30 | id = udev_device_get_id_filename(dev); | |
31 | if (id == NULL) | |
32 | return; | |
4cb72937 | 33 | util_strscpyl(filename, sizeof(filename), "/run/udev/tags/", tag, "/", id, NULL); |
912541b0 KS |
34 | |
35 | if (add) { | |
36 | int fd; | |
37 | ||
3cbd5f6b | 38 | mkdir_parents(filename, 0755); |
912541b0 KS |
39 | fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444); |
40 | if (fd >= 0) | |
41 | close(fd); | |
42 | } else { | |
43 | unlink(filename); | |
44 | } | |
c1dbe11d | 45 | } |
28460195 | 46 | |
c1dbe11d KS |
47 | int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add) |
48 | { | |
912541b0 KS |
49 | struct udev_list_entry *list_entry; |
50 | bool found; | |
51 | ||
52 | if (add && dev_old != NULL) { | |
53 | /* delete possible left-over tags */ | |
54 | udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) { | |
55 | const char *tag_old = udev_list_entry_get_name(list_entry); | |
56 | struct udev_list_entry *list_entry_current; | |
57 | ||
58 | found = false; | |
59 | udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) { | |
60 | const char *tag = udev_list_entry_get_name(list_entry_current); | |
61 | ||
33502ffe | 62 | if (streq(tag, tag_old)) { |
912541b0 KS |
63 | found = true; |
64 | break; | |
65 | } | |
66 | } | |
67 | if (!found) | |
68 | udev_device_tag(dev_old, tag_old, false); | |
69 | } | |
70 | } | |
71 | ||
72 | udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev)) | |
73 | udev_device_tag(dev, udev_list_entry_get_name(list_entry), add); | |
74 | ||
75 | return 0; | |
28460195 KS |
76 | } |
77 | ||
24d10766 KS |
78 | static bool device_has_info(struct udev_device *udev_device) |
79 | { | |
912541b0 KS |
80 | struct udev_list_entry *list_entry; |
81 | ||
82 | if (udev_device_get_devlinks_list_entry(udev_device) != NULL) | |
83 | return true; | |
84 | if (udev_device_get_devlink_priority(udev_device) != 0) | |
85 | return true; | |
86 | udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) | |
87 | if (udev_list_entry_get_num(list_entry)) | |
88 | return true; | |
89 | if (udev_device_get_tags_list_entry(udev_device) != NULL) | |
90 | return true; | |
91 | if (udev_device_get_watch_handle(udev_device) >= 0) | |
92 | return true; | |
93 | return false; | |
24d10766 KS |
94 | } |
95 | ||
aa8734ff | 96 | int udev_device_update_db(struct udev_device *udev_device) |
ca999860 | 97 | { |
9e13dbae | 98 | struct udev *udev = udev_device_get_udev(udev_device); |
912541b0 KS |
99 | bool has_info; |
100 | const char *id; | |
912541b0 KS |
101 | char filename[UTIL_PATH_SIZE]; |
102 | char filename_tmp[UTIL_PATH_SIZE]; | |
103 | FILE *f; | |
104 | ||
105 | id = udev_device_get_id_filename(udev_device); | |
106 | if (id == NULL) | |
107 | return -1; | |
108 | ||
109 | has_info = device_has_info(udev_device); | |
4cb72937 | 110 | util_strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); |
912541b0 KS |
111 | |
112 | /* do not store anything for otherwise empty devices */ | |
113 | if (!has_info && | |
114 | major(udev_device_get_devnum(udev_device)) == 0 && | |
115 | udev_device_get_ifindex(udev_device) == 0) { | |
116 | unlink(filename); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | /* write a database file */ | |
121 | util_strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL); | |
3cbd5f6b | 122 | mkdir_parents(filename_tmp, 0755); |
912541b0 KS |
123 | f = fopen(filename_tmp, "we"); |
124 | if (f == NULL) { | |
c8f8394a | 125 | udev_err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp); |
912541b0 KS |
126 | return -1; |
127 | } | |
128 | ||
129 | /* | |
130 | * set 'sticky' bit to indicate that we should not clean the | |
131 | * database when we transition from initramfs to the real root | |
132 | */ | |
133 | if (udev_device_get_db_persist(udev_device)) | |
134 | fchmod(fileno(f), 01644); | |
135 | ||
136 | if (has_info) { | |
137 | struct udev_list_entry *list_entry; | |
138 | ||
139 | if (major(udev_device_get_devnum(udev_device)) > 0) { | |
912541b0 | 140 | udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) |
4cb72937 | 141 | fprintf(f, "S:%s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/")); |
912541b0 KS |
142 | if (udev_device_get_devlink_priority(udev_device) != 0) |
143 | fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device)); | |
144 | if (udev_device_get_watch_handle(udev_device) >= 0) | |
145 | fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device)); | |
146 | } | |
147 | ||
148 | if (udev_device_get_usec_initialized(udev_device) > 0) | |
149 | fprintf(f, "I:%llu\n", udev_device_get_usec_initialized(udev_device)); | |
150 | ||
151 | udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { | |
152 | if (!udev_list_entry_get_num(list_entry)) | |
153 | continue; | |
154 | fprintf(f, "E:%s=%s\n", | |
155 | udev_list_entry_get_name(list_entry), | |
156 | udev_list_entry_get_value(list_entry)); | |
157 | } | |
158 | ||
159 | udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device)) | |
160 | fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry)); | |
161 | } | |
162 | ||
163 | fclose(f); | |
164 | rename(filename_tmp, filename); | |
c8f8394a | 165 | udev_dbg(udev, "created %s file '%s' for '%s'\n", has_info ? "db" : "empty", |
912541b0 KS |
166 | filename, udev_device_get_devpath(udev_device)); |
167 | return 0; | |
ca999860 GKH |
168 | } |
169 | ||
aa8734ff | 170 | int udev_device_delete_db(struct udev_device *udev_device) |
8e41d35d | 171 | { |
912541b0 | 172 | const char *id; |
912541b0 KS |
173 | char filename[UTIL_PATH_SIZE]; |
174 | ||
175 | id = udev_device_get_id_filename(udev_device); | |
176 | if (id == NULL) | |
177 | return -1; | |
4cb72937 | 178 | util_strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL); |
912541b0 KS |
179 | unlink(filename); |
180 | return 0; | |
8e41d35d | 181 | } |