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path: root/miscutils/makedevs.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * public domain -- Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
4 *
5 * makedevs
6 * Make ranges of device files quickly.
7 * known bugs: can't deal with alpha ranges
8 */
9//config:config MAKEDEVS
10//config: bool "makedevs"
11//config: default y
12//config: help
13//config: 'makedevs' is a utility used to create a batch of devices with
14//config: one command.
15//config:
16//config: There are two choices for command line behaviour, the interface
17//config: as used by LEAF/Linux Router Project, or a device table file.
18//config:
19//config: 'leaf' is traditionally what busybox follows, it allows multiple
20//config: devices of a particluar type to be created per command.
21//config: e.g. /dev/hda[0-9]
22//config: Device properties are passed as command line arguments.
23//config:
24//config: 'table' reads device properties from a file or stdin, allowing
25//config: a batch of unrelated devices to be made with one command.
26//config: User/group names are allowed as an alternative to uid/gid.
27//config:
28//config:choice
29//config: prompt "Choose makedevs behaviour"
30//config: depends on MAKEDEVS
31//config: default FEATURE_MAKEDEVS_TABLE
32//config:
33//config:config FEATURE_MAKEDEVS_LEAF
34//config: bool "leaf"
35//config:
36//config:config FEATURE_MAKEDEVS_TABLE
37//config: bool "table"
38//config:
39//config:endchoice
40
41//applet:IF_MAKEDEVS(APPLET(makedevs, BB_DIR_SBIN, BB_SUID_DROP))
42
43//kbuild:lib-$(CONFIG_MAKEDEVS) += makedevs.o
44
45//usage:#if ENABLE_FEATURE_MAKEDEVS_LEAF
46//usage:#define makedevs_trivial_usage
47//usage: "NAME TYPE MAJOR MINOR FIRST LAST [s]"
48//usage:#define makedevs_full_usage "\n\n"
49//usage: "Create a range of block or character special files"
50//usage: "\n"
51//usage: "\nTYPE is:"
52//usage: "\n b Block device"
53//usage: "\n c Character device"
54//usage: "\n f FIFO, MAJOR and MINOR are ignored"
55//usage: "\n"
56//usage: "\nFIRST..LAST specify numbers appended to NAME."
57//usage: "\nIf 's' is the last argument, the base device is created as well."
58//usage: "\n"
59//usage: "\nExamples:"
60//usage: "\n makedevs /dev/ttyS c 4 66 2 63 -> ttyS2-ttyS63"
61//usage: "\n makedevs /dev/hda b 3 0 0 8 s -> hda,hda1-hda8"
62//usage:
63//usage:#define makedevs_example_usage
64//usage: "# makedevs /dev/ttyS c 4 66 2 63\n"
65//usage: "[creates ttyS2-ttyS63]\n"
66//usage: "# makedevs /dev/hda b 3 0 0 8 s\n"
67//usage: "[creates hda,hda1-hda8]\n"
68//usage:#endif
69//usage:
70//usage:#if ENABLE_FEATURE_MAKEDEVS_TABLE
71//usage:#define makedevs_trivial_usage
72//usage: "[-d device_table] rootdir"
73//usage:#define makedevs_full_usage "\n\n"
74//usage: "Create a range of special files as specified in a device table.\n"
75//usage: "Device table entries take the form of:\n"
76//usage: "<name> <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count>\n"
77//usage: "Where name is the file name, type can be one of:\n"
78//usage: " f Regular file\n"
79//usage: " d Directory\n"
80//usage: " c Character device\n"
81//usage: " b Block device\n"
82//usage: " p Fifo (named pipe)\n"
83//usage: "uid is the user id for the target file, gid is the group id for the\n"
84//usage: "target file. The rest of the entries (major, minor, etc) apply to\n"
85//usage: "to device special files. A '-' may be used for blank entries."
86//usage:
87//usage:#define makedevs_example_usage
88//usage: "For example:\n"
89//usage: "<name> <type> <mode><uid><gid><major><minor><start><inc><count>\n"
90//usage: "/dev d 755 0 0 - - - - -\n"
91//usage: "/dev/console c 666 0 0 5 1 - - -\n"
92//usage: "/dev/null c 666 0 0 1 3 0 0 -\n"
93//usage: "/dev/zero c 666 0 0 1 5 0 0 -\n"
94//usage: "/dev/hda b 640 0 0 3 0 0 0 -\n"
95//usage: "/dev/hda b 640 0 0 3 1 1 1 15\n\n"
96//usage: "Will Produce:\n"
97//usage: "/dev\n"
98//usage: "/dev/console\n"
99//usage: "/dev/null\n"
100//usage: "/dev/zero\n"
101//usage: "/dev/hda\n"
102//usage: "/dev/hda[0-15]\n"
103//usage:#endif
104
105#include "libbb.h"
106
107#if ENABLE_FEATURE_MAKEDEVS_LEAF
108/*
109makedevs NAME TYPE MAJOR MINOR FIRST LAST [s]
110TYPEs:
111b Block device
112c Character device
113f FIFO
114
115FIRST..LAST specify numbers appended to NAME.
116If 's' is the last argument, the base device is created as well.
117Examples:
118 makedevs /dev/ttyS c 4 66 2 63 -> ttyS2-ttyS63
119 makedevs /dev/hda b 3 0 0 8 s -> hda,hda1-hda8
120*/
121int makedevs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
122int makedevs_main(int argc, char **argv)
123{
124 mode_t mode;
125 char *basedev, *type, *nodname, *buf;
126 int Smajor, Sminor, S, E;
127
128 if (argc < 7 || argv[1][0] == '-')
129 bb_show_usage();
130
131 basedev = argv[1];
132 buf = xasprintf("%s%u", argv[1], (unsigned)-1);
133 type = argv[2];
134 Smajor = xatoi_positive(argv[3]);
135 Sminor = xatoi_positive(argv[4]);
136 S = xatoi_positive(argv[5]);
137 E = xatoi_positive(argv[6]);
138 nodname = argv[7] ? basedev : buf;
139
140 mode = 0660;
141 switch (type[0]) {
142 case 'c':
143 mode |= S_IFCHR;
144 break;
145 case 'b':
146 mode |= S_IFBLK;
147 break;
148 case 'f':
149 mode |= S_IFIFO;
150 break;
151 default:
152 bb_show_usage();
153 }
154
155 while (S <= E) {
156 sprintf(buf, "%s%u", basedev, S);
157
158 /* if mode != S_IFCHR and != S_IFBLK,
159 * third param in mknod() ignored */
160 if (mknod(nodname, mode, makedev(Smajor, Sminor)) != 0
161 && errno != EEXIST
162 ) {
163 bb_perror_msg("can't create '%s'", nodname);
164 }
165
166 /*if (nodname == basedev)*/ /* ex. /dev/hda - to /dev/hda1 ... */
167 nodname = buf;
168 S++;
169 Sminor++;
170 }
171
172 return 0;
173}
174
175#elif ENABLE_FEATURE_MAKEDEVS_TABLE
176
177/* Licensed under GPLv2 or later, see file LICENSE in this source tree. */
178
179int makedevs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
180int makedevs_main(int argc UNUSED_PARAM, char **argv)
181{
182 parser_t *parser;
183 char *line = (char *)"-";
184 int ret = EXIT_SUCCESS;
185
186 opt_complementary = "=1"; /* exactly one param */
187 getopt32(argv, "d:", &line);
188 argv += optind;
189
190 xchdir(*argv); /* ensure root dir exists */
191
192 umask(0);
193
194 printf("rootdir=%s\ntable=", *argv);
195 if (NOT_LONE_DASH(line)) {
196 printf("'%s'\n", line);
197 } else {
198 puts("<stdin>");
199 }
200
201 parser = config_open(line);
202 while (config_read(parser, &line, 1, 1, "# \t", PARSE_NORMAL)) {
203 int linenum;
204 char type;
205 unsigned mode = 0755;
206 unsigned major = 0;
207 unsigned minor = 0;
208 unsigned count = 0;
209 unsigned increment = 0;
210 unsigned start = 0;
211 char name[41];
212 char user[41];
213 char group[41];
214 char *full_name = name;
215 uid_t uid;
216 gid_t gid;
217
218 linenum = parser->lineno;
219
220 if ((2 > sscanf(line, "%40s %c %o %40s %40s %u %u %u %u %u",
221 name, &type, &mode, user, group,
222 &major, &minor, &start, &increment, &count))
223 || ((unsigned)(major | minor | start | count | increment) > 255)
224 ) {
225 bb_error_msg("invalid line %d: '%s'", linenum, line);
226 ret = EXIT_FAILURE;
227 continue;
228 }
229
230 gid = (*group) ? get_ug_id(group, xgroup2gid) : getgid();
231 uid = (*user) ? get_ug_id(user, xuname2uid) : getuid();
232 /* We are already in the right root dir,
233 * so make absolute paths relative */
234 if ('/' == *full_name)
235 full_name++;
236
237 if (type == 'd') {
238 bb_make_directory(full_name, mode | S_IFDIR, FILEUTILS_RECUR);
239 if (chown(full_name, uid, gid) == -1) {
240 chown_fail:
241 bb_perror_msg("line %d: can't chown %s", linenum, full_name);
242 ret = EXIT_FAILURE;
243 continue;
244 }
245 if (chmod(full_name, mode) < 0) {
246 chmod_fail:
247 bb_perror_msg("line %d: can't chmod %s", linenum, full_name);
248 ret = EXIT_FAILURE;
249 continue;
250 }
251 } else if (type == 'f') {
252 struct stat st;
253 if ((stat(full_name, &st) < 0 || !S_ISREG(st.st_mode))) {
254 bb_perror_msg("line %d: regular file '%s' does not exist", linenum, full_name);
255 ret = EXIT_FAILURE;
256 continue;
257 }
258 if (chown(full_name, uid, gid) < 0)
259 goto chown_fail;
260 if (chmod(full_name, mode) < 0)
261 goto chmod_fail;
262 } else {
263 dev_t rdev;
264 unsigned i;
265 char *full_name_inc;
266
267 if (type == 'p') {
268 mode |= S_IFIFO;
269 } else if (type == 'c') {
270 mode |= S_IFCHR;
271 } else if (type == 'b') {
272 mode |= S_IFBLK;
273 } else {
274 bb_error_msg("line %d: unsupported file type %c", linenum, type);
275 ret = EXIT_FAILURE;
276 continue;
277 }
278
279 full_name_inc = xmalloc(strlen(full_name) + sizeof(int)*3 + 2);
280 if (count)
281 count--;
282 for (i = start; i <= start + count; i++) {
283 sprintf(full_name_inc, count ? "%s%u" : "%s", full_name, i);
284 rdev = makedev(major, minor + (i - start) * increment);
285 if (mknod(full_name_inc, mode, rdev) != 0
286 && errno != EEXIST
287 ) {
288 bb_perror_msg("line %d: can't create node %s", linenum, full_name_inc);
289 ret = EXIT_FAILURE;
290 } else if (chown(full_name_inc, uid, gid) < 0) {
291 bb_perror_msg("line %d: can't chown %s", linenum, full_name_inc);
292 ret = EXIT_FAILURE;
293 } else if (chmod(full_name_inc, mode) < 0) {
294 bb_perror_msg("line %d: can't chmod %s", linenum, full_name_inc);
295 ret = EXIT_FAILURE;
296 }
297 }
298 free(full_name_inc);
299 }
300 }
301 if (ENABLE_FEATURE_CLEAN_UP)
302 config_close(parser);
303
304 return ret;
305}
306
307#else
308# error makedevs configuration error, either leaf or table must be selected
309#endif
310
generated by cgit at 2024-05-16 03:24:10 (GMT)