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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <getopt.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "libkmod-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)
{
int ret;
ret = fprintf(out, "%c /dev/%s 0600 - - - %u:%u\n", type, devname, maj, min);
if (ret >= 0)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
}
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 use a machine-readable format\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];
FILE *in = NULL, *out = stdout;
const struct static_nodes_format *format = &static_nodes_format_human;
char buf[4096];
int 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':
out = fopen(optarg, "we");
if (out == NULL) {
fprintf(stderr, "Error: could not create %s!\n", optarg);
ret = EXIT_FAILURE;
goto finish;
}
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), "/lib/modules/%s/modules.devname", kernel.release);
in = fopen(modules, "re");
if (in == NULL && errno != ENOENT) {
fprintf(stderr, "Error: could not open /lib/modules/%s/modules.devname!\n", kernel.release);
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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