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https://github.com/AuxXxilium/kmod.git
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tools: add static-nodes tool
This tool reads modules.devname from the current kernel directory and outputs the information. By default in a human-readable format, and optionally in machine-readable formats. For now only the tmpfiles.d(5) format is supported, but more could easily be added in the future if there is a need. This means nothing but kmod needs to reads the private files under /lib/modules/. In particular systemd-udevd can stop reading modules.devname. Tools that used to read /lib/modules/`uname -r`/modules.devname directly, can now move to reading 'kmod static-nodes devname'.
This commit is contained in:
Tom Gundersen
Lucas De Marchi
parent
a20a37c351
commit
db6f2fc7e1
@ -110,7 +110,8 @@ noinst_SCRIPTS = tools/insmod tools/rmmod tools/lsmod \
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tools_kmod_SOURCES = tools/kmod.c tools/kmod.h tools/lsmod.c \
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tools/rmmod.c tools/insmod.c \
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tools/modinfo.c tools/modprobe.c \
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tools/depmod.c tools/log.h tools/log.c
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tools/depmod.c tools/log.h tools/log.c \
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tools/static-nodes.c
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tools_kmod_LDADD = libkmod/libkmod-util.la \
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libkmod/libkmod.la
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@ -37,6 +37,7 @@ static const struct kmod_cmd kmod_cmd_help;
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static const struct kmod_cmd *kmod_cmds[] = {
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&kmod_cmd_help,
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&kmod_cmd_list,
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&kmod_cmd_static_nodes,
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};
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static const struct kmod_cmd *kmod_compat_cmds[] = {
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@ -35,5 +35,6 @@ extern const struct kmod_cmd kmod_cmd_compat_modprobe;
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extern const struct kmod_cmd kmod_cmd_compat_depmod;
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extern const struct kmod_cmd kmod_cmd_list;
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extern const struct kmod_cmd kmod_cmd_static_nodes;
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#include "log.h"
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246
tools/static-nodes.c
Normal file
246
tools/static-nodes.c
Normal file
@ -0,0 +1,246 @@
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/*
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* kmod-static-nodes - manage modules.devname
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*
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* Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org>
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* Copyright (C) 2011-2013 ProFUSION embedded systems
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* Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <getopt.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <limits.h>
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#include <sys/utsname.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "libkmod-util.h"
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#include "kmod.h"
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struct static_nodes_format {
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const char *name;
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int (*write)(FILE *, char[], char[], char, unsigned int, unsigned int);
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const char *description;
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};
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static const struct static_nodes_format static_nodes_format_human;
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static const struct static_nodes_format static_nodes_format_tmpfiles;
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static const struct static_nodes_format static_nodes_format_devname;
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static const struct static_nodes_format *static_nodes_formats[] = {
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&static_nodes_format_human,
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&static_nodes_format_tmpfiles,
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&static_nodes_format_devname,
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};
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static const char cmdopts_s[] = "o:f:h";
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static const struct option cmdopts[] = {
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{ "output", required_argument, 0, 'o'},
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{ "format", required_argument, 0, 'f'},
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{ "help", no_argument, 0, 'h'},
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{ },
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};
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static int write_human(FILE *out, char modname[], char devname[], char type, unsigned int maj, unsigned int min)
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{
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int ret;
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ret = fprintf(out,
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"Module: %s\n"
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"\tDevice node: /dev/%s\n"
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"\t\tType: %s device\n"
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"\t\tMajor: %u\n"
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"\t\tMinor: %u\n",
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modname, devname, (type == 'c') ? "character" : "block", maj, min);
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if (ret >= 0)
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return EXIT_SUCCESS;
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else
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return EXIT_FAILURE;
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}
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static const struct static_nodes_format static_nodes_format_human = {
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.name = "human",
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.write = write_human,
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.description = "(default) a human readable format. Do not parse.",
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};
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static int write_tmpfiles(FILE *out, char modname[], char devname[], char type, unsigned int maj, unsigned int min)
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{
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int ret;
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ret = fprintf(out, "%c /dev/%s 0600 - - - %u:%u\n", type, devname, maj, min);
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if (ret >= 0)
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return EXIT_SUCCESS;
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else
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return EXIT_FAILURE;
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}
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static const struct static_nodes_format static_nodes_format_tmpfiles = {
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.name = "tmpfiles",
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.write = write_tmpfiles,
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.description = "the tmpfiles.d(5) format used by systemd-tmpfiles.",
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};
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static int write_devname(FILE *out, char modname[], char devname[], char type, unsigned int maj, unsigned int min)
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{
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int ret;
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ret = fprintf(out, "%s %s %c%u:%u\n", modname, devname, type, maj, min);
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if (ret >= 0)
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return EXIT_SUCCESS;
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else
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return EXIT_FAILURE;
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}
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static const struct static_nodes_format static_nodes_format_devname = {
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.name = "devname",
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.write = write_devname,
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.description = "the modules.devname format.",
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};
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static void help(void)
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{
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size_t i;
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printf("Usage:\n"
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"\t%s static-nodes [options]\n"
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"\n"
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"kmod static-nodes outputs the static-node information of the currently running kernel.\n"
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"\n"
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"Options:\n"
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"\t-f, --format=FORMAT use a machine-readable format\n"
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"\t-o, --output=FILE write output to file\n"
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"\t-h, --help show this help\n"
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"\n"
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"Formats:\n",
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program_invocation_short_name);
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for (i = 0; i < ARRAY_SIZE(static_nodes_formats); i++) {
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if (static_nodes_formats[i]->description != NULL) {
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printf("\t%-12s %s\n", static_nodes_formats[i]->name,
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static_nodes_formats[i]->description);
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}
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}
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}
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static int do_static_nodes(int argc, char *argv[])
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{
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struct utsname kernel;
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char modules[PATH_MAX];
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FILE *in = NULL, *out = stdout;
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const struct static_nodes_format *format = &static_nodes_format_human;
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char buf[4096];
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int ret = EXIT_SUCCESS;
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for (;;) {
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int c, idx = 0, valid;
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size_t i;
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c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
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if (c == -1) {
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break;
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}
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switch (c) {
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case 'o':
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out = fopen(optarg, "we");
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if (out == NULL) {
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fprintf(stderr, "Error: could not create %s!\n", optarg);
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ret = EXIT_FAILURE;
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goto finish;
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}
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break;
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case 'f':
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valid = 0;
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for (i = 0; i < ARRAY_SIZE(static_nodes_formats); i++) {
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if (streq(static_nodes_formats[i]->name, optarg)) {
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format = static_nodes_formats[i];
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valid = 1;
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}
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}
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if (!valid) {
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fprintf(stderr, "Unknown format: '%s'.\n", optarg);
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help();
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ret = EXIT_FAILURE;
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goto finish;
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}
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break;
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case 'h':
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help();
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goto finish;
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case '?':
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ret = EXIT_FAILURE;
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goto finish;
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default:
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fprintf(stderr, "Unexpected commandline option '%c'.\n", c);
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help();
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ret = EXIT_FAILURE;
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goto finish;
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}
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}
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if (uname(&kernel) < 0) {
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fputs("Error: uname failed!\n", stderr);
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ret = EXIT_FAILURE;
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goto finish;
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}
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snprintf(modules, sizeof(modules), "/lib/modules/%s/modules.devname", kernel.release);
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in = fopen(modules, "re");
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if (in == NULL && errno != ENOENT) {
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fprintf(stderr, "Error: could not open /lib/modules/%s/modules.devname!\n", kernel.release);
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ret = EXIT_FAILURE;
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goto finish;
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}
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while (fgets(buf, sizeof(buf), in) != NULL) {
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char modname[PATH_MAX];
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char devname[PATH_MAX];
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char type;
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unsigned int maj, min;
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int matches;
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if (buf[0] == '#')
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continue;
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matches = sscanf(buf, "%s %s %c%u:%u", modname, devname, &type, &maj, &min);
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if (matches != 5 || (type != 'c' && type != 'b')) {
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fprintf(stderr, "Error: invalid devname entry: %s", buf);
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ret = EXIT_FAILURE;
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continue;
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}
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format->write(out, modname, devname, type, maj, min);
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}
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finish:
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if (in)
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fclose(in);
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if (out)
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fclose(out);
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return ret;
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}
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const struct kmod_cmd kmod_cmd_static_nodes = {
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.name = "static-nodes",
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.cmd = do_static_nodes,
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.help = "outputs the static-node information installed with the currently running kernel",
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};
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