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-rw-r--r--tools/static-nodes.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/tools/static-nodes.c b/tools/static-nodes.c
new file mode 100644
index 0000000..5ef3743
--- /dev/null
+++ b/tools/static-nodes.c
@@ -0,0 +1,277 @@
+/*
+ * kmod-static-nodes - manage modules.devname
+ *
+ * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2011-2013 ProFUSION embedded systems
+ * Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+
+#include <shared/util.h>
+
+#include "kmod.h"
+
+struct static_nodes_format {
+ const char *name;
+ int (*write)(FILE *, char[], char[], char, unsigned int, unsigned int);
+ const char *description;
+};
+
+static const struct static_nodes_format static_nodes_format_human;
+static const struct static_nodes_format static_nodes_format_tmpfiles;
+static const struct static_nodes_format static_nodes_format_devname;
+
+static const struct static_nodes_format *static_nodes_formats[] = {
+ &static_nodes_format_human,
+ &static_nodes_format_tmpfiles,
+ &static_nodes_format_devname,
+};
+
+static const char cmdopts_s[] = "o:f:h";
+static const struct option cmdopts[] = {
+ { "output", required_argument, 0, 'o'},
+ { "format", required_argument, 0, 'f'},
+ { "help", no_argument, 0, 'h'},
+ { },
+};
+
+static int write_human(FILE *out, char modname[], char devname[], char type, unsigned int maj, unsigned int min)
+{
+ int ret;
+
+ ret = fprintf(out,
+ "Module: %s\n"
+ "\tDevice node: /dev/%s\n"
+ "\t\tType: %s device\n"
+ "\t\tMajor: %u\n"
+ "\t\tMinor: %u\n",
+ modname, devname,
+ (type == 'c') ? "character" : "block", maj, min);
+ if (ret >= 0)
+ return EXIT_SUCCESS;
+ else
+ return EXIT_FAILURE;
+}
+
+static const struct static_nodes_format static_nodes_format_human = {
+ .name = "human",
+ .write = write_human,
+ .description = "(default) a human readable format. Do not parse.",
+};
+
+static int write_tmpfiles(FILE *out, char modname[], char devname[], char type, unsigned int maj, unsigned int min)
+{
+ const char *dir;
+ int ret;
+
+ dir = strrchr(devname, '/');
+ if (dir) {
+ ret = fprintf(out, "d /dev/%.*s 0755 - - -\n",
+ (int)(dir - devname), devname);
+ if (ret < 0)
+ return EXIT_FAILURE;
+ }
+
+ ret = fprintf(out, "%c! /dev/%s 0600 - - - %u:%u\n",
+ type, devname, maj, min);
+ if (ret < 0)
+ return EXIT_FAILURE;
+
+ return EXIT_SUCCESS;
+}
+
+static const struct static_nodes_format static_nodes_format_tmpfiles = {
+ .name = "tmpfiles",
+ .write = write_tmpfiles,
+ .description = "the tmpfiles.d(5) format used by systemd-tmpfiles.",
+};
+
+static int write_devname(FILE *out, char modname[], char devname[], char type, unsigned int maj, unsigned int min)
+{
+ int ret;
+
+ ret = fprintf(out, "%s %s %c%u:%u\n", modname, devname, type, maj, min);
+ if (ret >= 0)
+ return EXIT_SUCCESS;
+ else
+ return EXIT_FAILURE;
+}
+
+static const struct static_nodes_format static_nodes_format_devname = {
+ .name = "devname",
+ .write = write_devname,
+ .description = "the modules.devname format.",
+};
+
+static void help(void)
+{
+ size_t i;
+
+ printf("Usage:\n"
+ "\t%s static-nodes [options]\n"
+ "\n"
+ "kmod static-nodes outputs the static-node information of the currently running kernel.\n"
+ "\n"
+ "Options:\n"
+ "\t-f, --format=FORMAT choose format to use: see \"Formats\"\n"
+ "\t-o, --output=FILE write output to file\n"
+ "\t-h, --help show this help\n"
+ "\n"
+ "Formats:\n",
+ program_invocation_short_name);
+
+ for (i = 0; i < ARRAY_SIZE(static_nodes_formats); i++) {
+ if (static_nodes_formats[i]->description != NULL) {
+ printf("\t%-12s %s\n", static_nodes_formats[i]->name,
+ static_nodes_formats[i]->description);
+ }
+ }
+}
+
+static int do_static_nodes(int argc, char *argv[])
+{
+ struct utsname kernel;
+ char modules[PATH_MAX], buf[4096];
+ const char *output = "/dev/stdout";
+ FILE *in = NULL, *out = NULL;
+ const struct static_nodes_format *format = &static_nodes_format_human;
+ int r, ret = EXIT_SUCCESS;
+
+ for (;;) {
+ int c, idx = 0, valid;
+ size_t i;
+
+ c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
+ if (c == -1) {
+ break;
+ }
+ switch (c) {
+ case 'o':
+ output = optarg;
+ break;
+ case 'f':
+ valid = 0;
+
+ for (i = 0; i < ARRAY_SIZE(static_nodes_formats); i++) {
+ if (streq(static_nodes_formats[i]->name, optarg)) {
+ format = static_nodes_formats[i];
+ valid = 1;
+ }
+ }
+
+ if (!valid) {
+ fprintf(stderr, "Unknown format: '%s'.\n",
+ optarg);
+ help();
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+ break;
+ case 'h':
+ help();
+ goto finish;
+ case '?':
+ ret = EXIT_FAILURE;
+ goto finish;
+ default:
+ fprintf(stderr, "Unexpected commandline option '%c'.\n",
+ c);
+ help();
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+ }
+
+ if (uname(&kernel) < 0) {
+ fputs("Error: uname failed!\n", stderr);
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+
+ snprintf(modules, sizeof(modules), MODULE_DIRECTORY "/%s/modules.devname", kernel.release);
+ in = fopen(modules, "re");
+ if (in == NULL) {
+ if (errno == ENOENT) {
+ fprintf(stderr, "Warning: " MODULE_DIRECTORY "/%s/modules.devname not found - ignoring\n",
+ kernel.release);
+ ret = EXIT_SUCCESS;
+ } else {
+ fprintf(stderr, "Error: could not open " MODULE_DIRECTORY "/%s/modules.devname - %m\n",
+ kernel.release);
+ ret = EXIT_FAILURE;
+ }
+ goto finish;
+ }
+
+ r = mkdir_parents(output, 0755);
+ if (r < 0) {
+ fprintf(stderr, "Error: could not create parent directory for %s - %m.\n", output);
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+
+ out = fopen(output, "we");
+ if (out == NULL) {
+ fprintf(stderr, "Error: could not create %s - %m\n", output);
+ ret = EXIT_FAILURE;
+ goto finish;
+ }
+
+ while (fgets(buf, sizeof(buf), in) != NULL) {
+ char modname[PATH_MAX];
+ char devname[PATH_MAX];
+ char type;
+ unsigned int maj, min;
+ int matches;
+
+ if (buf[0] == '#')
+ continue;
+
+ matches = sscanf(buf, "%s %s %c%u:%u", modname, devname,
+ &type, &maj, &min);
+ if (matches != 5 || (type != 'c' && type != 'b')) {
+ fprintf(stderr, "Error: invalid devname entry: %s", buf);
+ ret = EXIT_FAILURE;
+ continue;
+ }
+
+ format->write(out, modname, devname, type, maj, min);
+ }
+
+finish:
+ if (in)
+ fclose(in);
+ if (out)
+ fclose(out);
+ return ret;
+}
+
+const struct kmod_cmd kmod_cmd_static_nodes = {
+ .name = "static-nodes",
+ .cmd = do_static_nodes,
+ .help = "outputs the static-node information installed with the currently running kernel",
+};
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