tools/kmod.c

   1 /*
   2  * kmod - one tool to rule them all
   3  *
   4  * Copyright (C) 2011  ProFUSION embedded systems
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <getopt.h>
  24 #include <string.h>
  25 #include <libkmod.h>
  26 #include "kmod.h"
  27
  28 static const char options_s[] = "+hV";
  29 static const struct option options[] = {
  30         { "help", no_argument, NULL, 'h' },
  31         { "version", no_argument, NULL, 'V' },
  32         {}
  33 };
  34
  35 static const struct kmod_cmd kmod_cmd_help;
  36
  37 static const struct kmod_cmd *kmod_cmds[] = {
  38         &kmod_cmd_help,
  39         &kmod_cmd_list,
  40 };
  41
  42 static const struct kmod_cmd *kmod_compat_cmds[] = {
  43         &kmod_cmd_compat_lsmod,
  44         &kmod_cmd_compat_rmmod,
  45         &kmod_cmd_compat_insmod,
  46         &kmod_cmd_compat_modinfo,
  47         &kmod_cmd_compat_modprobe,
  48         &kmod_cmd_compat_depmod,
  49 };
  50
  51 static int kmod_help(int argc, char *argv[])
  52 {
  53         size_t i;
  54
  55         printf("kmod - Manage kernel modules: list, load, unload, etc\n"
  56                         "Usage:\n"
  57                         "\t%s [options] command [command_options]\n\n"
  58                         "Options:\n"
  59                         "\t-V, --version     show version\n"
  60                         "\t-h, --help        show this help\n\n"
  61                         "Commands:\n", basename(argv[0]));
  62
  63         for (i = 0; i < ARRAY_SIZE(kmod_cmds); i++) {
  64                 if (kmod_cmds[i]->help != NULL) {
  65                         printf("  %-12s %s\n", kmod_cmds[i]->name,
  66                                                         kmod_cmds[i]->help);
  67                 }
  68         }
  69
  70         puts("\nkmod also handles gracefully if called from following symlinks:");
  71
  72         for (i = 0; i < ARRAY_SIZE(kmod_compat_cmds); i++) {
  73                 if (kmod_compat_cmds[i]->help != NULL) {
  74                         printf("  %-12s %s\n", kmod_compat_cmds[i]->name,
  75                                                 kmod_compat_cmds[i]->help);
  76                 }
  77         }
  78
  79         return EXIT_SUCCESS;
  80 }
  81
  82 static const struct kmod_cmd kmod_cmd_help = {
  83         .name = "help",
  84         .cmd = kmod_help,
  85         .help = "Show help message",
  86 };
  87
  88 static int handle_kmod_commands(int argc, char *argv[])
  89 {
  90         const char *cmd;
  91         int err = 0;
  92         size_t i;
  93
  94         for (;;) {
  95                 int c;
  96
  97                 c = getopt_long(argc, argv, options_s, options, NULL);
  98                 if (c == -1)
  99                         break;
 100
 101                 switch (c) {
 102                 case 'h':
 103                         kmod_help(argc, argv);
 104                         return EXIT_SUCCESS;
 105                 case 'V':
 106                         puts("kmod version " VERSION);
 107                         return EXIT_SUCCESS;
 108                 case '?':
 109                         return EXIT_FAILURE;
 110                 default:
 111                         fprintf(stderr, "Error: unexpected getopt_long() value '%c'.\n", c);
 112                         return EXIT_FAILURE;
 113                 }
 114         }
 115
 116         if (optind >= argc) {
 117                 fputs("missing command\n", stderr);
 118                 goto fail;
 119         }
 120
 121         cmd = argv[optind];
 122
 123         for (i = 0, err = -EINVAL; i < ARRAY_SIZE(kmod_cmds); i++) {
 124                 if (strcmp(kmod_cmds[i]->name, cmd) != 0)
 125                         continue;
 126
 127                 err = kmod_cmds[i]->cmd(--argc, ++argv);
 128         }
 129
 130         if (err < 0) {
 131                 fprintf(stderr, "invalid command '%s'\n", cmd);
 132                 goto fail;
 133         }
 134
 135         return err;
 136
 137 fail:
 138         kmod_help(argc, argv);
 139         return EXIT_FAILURE;
 140 }
 141
 142
 143 static int handle_kmod_compat_commands(int argc, char *argv[])
 144 {
 145         const char *cmd;
 146         size_t i;
 147
 148         cmd = basename(argv[0]);
 149
 150         for (i = 0; i < ARRAY_SIZE(kmod_compat_cmds); i++) {
 151                 if (strcmp(kmod_compat_cmds[i]->name, cmd) == 0)
 152                         return kmod_compat_cmds[i]->cmd(argc, argv);
 153         }
 154
 155         return -ENOENT;
 156 }
 157
 158 int main(int argc, char *argv[])
 159 {
 160         const char *binname = basename(argv[0]);
 161         int err;
 162
 163         if (strcmp(binname, "kmod") == 0)
 164                 err = handle_kmod_commands(argc, argv);
 165         else
 166                 err = handle_kmod_compat_commands(argc, argv);
 167
 168         return err;
 169 }