Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame^] | 1 | /* |
| 2 | * libkmod - interface to kernel module operations |
| 3 | * |
| 4 | * Copyright (C) 2011 ProFUSION embedded systems |
| 5 | * Copyright (C) 2011 Lucas De Marchi <lucas.de.marchi@gmail.com> |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation version 2.1. |
| 10 | * |
| 11 | * This library 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 GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <stddef.h> |
| 24 | #include <stdarg.h> |
| 25 | #include <unistd.h> |
| 26 | #include <errno.h> |
| 27 | #include <string.h> |
| 28 | #include <ctype.h> |
| 29 | #include <inttypes.h> |
| 30 | #include <sys/stat.h> |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/mman.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "libkmod.h" |
| 36 | #include "libkmod-private.h" |
| 37 | |
| 38 | /** |
| 39 | * kmod_module: |
| 40 | * |
| 41 | * Opaque object representing a module. |
| 42 | */ |
| 43 | struct kmod_module { |
| 44 | struct kmod_ctx *ctx; |
| 45 | int refcount; |
| 46 | const char *path; |
| 47 | const char *name; |
| 48 | }; |
| 49 | |
| 50 | static char *path_to_modname(const char *path) |
| 51 | { |
| 52 | char *modname; |
| 53 | char *c; |
| 54 | |
| 55 | modname = basename(path); |
| 56 | if (modname == NULL || modname[0] == '\0') |
| 57 | return NULL; |
| 58 | |
| 59 | modname = strdup(modname); |
| 60 | for (c = modname; *c != '\0' && *c != '.'; c++) { |
| 61 | if (*c == '-') |
| 62 | *c = '_'; |
| 63 | } |
| 64 | |
| 65 | *c = '\0'; |
| 66 | return modname; |
| 67 | } |
| 68 | |
| 69 | static const char *get_modname(struct kmod_module *mod) |
| 70 | { |
| 71 | if (mod->name == NULL) |
| 72 | mod->name = path_to_modname(mod->path); |
| 73 | |
| 74 | return mod->name; |
| 75 | } |
| 76 | |
| 77 | KMOD_EXPORT int kmod_module_new_from_name(struct kmod_ctx *ctx, |
| 78 | const char *name, |
| 79 | struct kmod_module **mod) |
| 80 | { |
| 81 | struct kmod_module *m; |
| 82 | |
| 83 | if (ctx == NULL || name == NULL) |
| 84 | return -ENOENT; |
| 85 | |
| 86 | m = calloc(1, sizeof(*m)); |
| 87 | if (m == NULL) { |
| 88 | free(m); |
| 89 | return -ENOMEM; |
| 90 | } |
| 91 | |
| 92 | m->ctx = kmod_ref(ctx); |
| 93 | m->name = strdup(name); |
| 94 | |
| 95 | *mod = m; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | KMOD_EXPORT int kmod_module_new_from_path(struct kmod_ctx *ctx, |
| 101 | const char *path, |
| 102 | struct kmod_module **mod) |
| 103 | { |
| 104 | struct kmod_module *m; |
| 105 | int err; |
| 106 | struct stat st; |
| 107 | |
| 108 | if (ctx == NULL || path == NULL) |
| 109 | return -ENOENT; |
| 110 | |
| 111 | err = stat(path, &st); |
| 112 | if (err < 0) |
| 113 | return -errno; |
| 114 | |
| 115 | m = calloc(1, sizeof(*m)); |
| 116 | if (m == NULL) { |
| 117 | free(m); |
| 118 | return -ENOMEM; |
| 119 | } |
| 120 | |
| 121 | m->ctx = kmod_ref(ctx); |
| 122 | m->path = strdup(path); |
| 123 | |
| 124 | *mod = m; |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | KMOD_EXPORT struct kmod_module *kmod_module_unref(struct kmod_module *mod) |
| 130 | { |
| 131 | if (mod == NULL) |
| 132 | return NULL; |
| 133 | |
| 134 | if (--mod->refcount > 0) |
| 135 | return mod; |
| 136 | |
| 137 | DBG(mod->ctx, "kmod_module %p released\n", mod); |
| 138 | |
| 139 | kmod_unref(mod->ctx); |
| 140 | free((char *) mod->path); |
| 141 | free((char *) mod->name); |
| 142 | free(mod); |
| 143 | return NULL; |
| 144 | } |
| 145 | |
| 146 | KMOD_EXPORT struct kmod_module *kmod_module_ref(struct kmod_module *mod) |
| 147 | { |
| 148 | if (mod == NULL) |
| 149 | return NULL; |
| 150 | |
| 151 | mod->refcount++; |
| 152 | |
| 153 | return mod; |
| 154 | } |
| 155 | |
| 156 | extern long delete_module(const char *name, unsigned int flags); |
| 157 | |
| 158 | KMOD_EXPORT int kmod_module_remove_module(struct kmod_module *mod, |
| 159 | unsigned int flags) |
| 160 | { |
| 161 | int err; |
| 162 | const char *modname; |
| 163 | |
| 164 | if (mod == NULL) |
| 165 | return -ENOENT; |
| 166 | |
| 167 | /* Filter out other flags */ |
| 168 | flags &= (KMOD_REMOVE_FORCE | KMOD_REMOVE_NOWAIT); |
| 169 | |
| 170 | modname = get_modname(mod); |
| 171 | err = delete_module(modname, flags); |
| 172 | if (err != 0) { |
| 173 | ERR(mod->ctx, "Removing '%s': %s\n", modname, |
| 174 | strerror(-err)); |
| 175 | return err; |
| 176 | } |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | extern long init_module(void *mem, unsigned long len, const char *args); |
| 182 | |
| 183 | KMOD_EXPORT int kmod_module_insert_module(struct kmod_module *mod, |
| 184 | unsigned int flags) |
| 185 | { |
| 186 | int err; |
| 187 | void *mmaped_file; |
| 188 | struct stat st; |
| 189 | int fd; |
| 190 | const char *args = ""; |
| 191 | |
| 192 | if (mod == NULL) |
| 193 | return -ENOENT; |
| 194 | |
| 195 | if (mod->path == NULL) { |
| 196 | ERR(mod->ctx, "Not supported to load a module by name yet"); |
| 197 | return -ENOSYS; |
| 198 | } |
| 199 | |
| 200 | if (flags != 0) |
| 201 | INFO(mod->ctx, "Flags are not implemented yet"); |
| 202 | |
| 203 | if ((fd = open(mod->path, O_RDONLY)) < 0) { |
| 204 | err = -errno; |
| 205 | return err; |
| 206 | } |
| 207 | |
| 208 | stat(mod->path, &st); |
| 209 | |
| 210 | if ((mmaped_file = mmap(0, st.st_size, PROT_READ, |
| 211 | MAP_PRIVATE, fd, 0)) == MAP_FAILED) { |
| 212 | close(fd); |
| 213 | return -errno; |
| 214 | } |
| 215 | |
| 216 | err = init_module(mmaped_file, st.st_size, args); |
| 217 | if (err < 0) |
| 218 | ERR(mod->ctx, "Failed to insert module '%s'", mod->path); |
| 219 | |
| 220 | munmap(mmaped_file, st.st_size); |
| 221 | close(fd); |
| 222 | |
| 223 | return err; |
| 224 | } |