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Diffstat (limited to 'libkmod/libkmod-module.c')
| -rw-r--r-- | libkmod/libkmod-module.c | 2986 |
1 files changed, 2986 insertions, 0 deletions
diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c new file mode 100644 index 0000000..585da41 --- /dev/null +++ b/libkmod/libkmod-module.c @@ -0,0 +1,2986 @@ +/* + * libkmod - interface to kernel module operations + * + * Copyright (C) 2011-2013 ProFUSION embedded systems + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <assert.h> +#include <ctype.h> +#include <dirent.h> +#include <errno.h> +#include <fnmatch.h> +#include <inttypes.h> +#include <limits.h> +#include <stdarg.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/mman.h> +#include <sys/stat.h> +#include <sys/syscall.h> +#include <sys/types.h> +#include <sys/wait.h> +#ifdef HAVE_LINUX_MODULE_H +#include <linux/module.h> +#endif + +#include <shared/util.h> + +#include "libkmod.h" +#include "libkmod-internal.h" + +/** + * SECTION:libkmod-module + * @short_description: operate on kernel modules + */ + +enum kmod_module_builtin { + KMOD_MODULE_BUILTIN_UNKNOWN, + KMOD_MODULE_BUILTIN_NO, + KMOD_MODULE_BUILTIN_YES, +}; + +/** + * kmod_module: + * + * Opaque object representing a module. + */ +struct kmod_module { + struct kmod_ctx *ctx; + char *hashkey; + char *name; + char *path; + struct kmod_list *dep; + char *options; + const char *install_commands; /* owned by kmod_config */ + const char *remove_commands; /* owned by kmod_config */ + char *alias; /* only set if this module was created from an alias */ + struct kmod_file *file; + int n_dep; + int refcount; + struct { + bool dep : 1; + bool options : 1; + bool install_commands : 1; + bool remove_commands : 1; + } init; + + /* + * mark if module is builtin, i.e. it's present on modules.builtin + * file. This is set as soon as it is needed or as soon as we know + * about it, i.e. the module was created from builtin lookup. + */ + enum kmod_module_builtin builtin; + + /* + * private field used by kmod_module_get_probe_list() to detect + * dependency loops + */ + bool visited : 1; + + /* + * set by kmod_module_get_probe_list: indicates for probe_insert() + * whether the module's command and softdep should be ignored + */ + bool ignorecmd : 1; + + /* + * set by kmod_module_get_probe_list: indicates whether this is the + * module the user asked for or its dependency, or whether this + * is a softdep only + */ + bool required : 1; +}; + +static inline const char *path_join(const char *path, size_t prefixlen, + char buf[PATH_MAX]) +{ + size_t pathlen; + + if (path[0] == '/') + return path; + + pathlen = strlen(path); + if (prefixlen + pathlen + 1 >= PATH_MAX) + return NULL; + + memcpy(buf + prefixlen, path, pathlen + 1); + return buf; +} + +static inline bool module_is_inkernel(struct kmod_module *mod) +{ + int state = kmod_module_get_initstate(mod); + + if (state == KMOD_MODULE_LIVE || + state == KMOD_MODULE_BUILTIN) + return true; + + return false; +} + +int kmod_module_parse_depline(struct kmod_module *mod, char *line) +{ + struct kmod_ctx *ctx = mod->ctx; + struct kmod_list *list = NULL; + const char *dirname; + char buf[PATH_MAX]; + char *p, *saveptr; + int err = 0, n = 0; + size_t dirnamelen; + + if (mod->init.dep) + return mod->n_dep; + assert(mod->dep == NULL); + mod->init.dep = true; + + p = strchr(line, ':'); + if (p == NULL) + return 0; + + *p = '\0'; + dirname = kmod_get_dirname(mod->ctx); + dirnamelen = strlen(dirname); + if (dirnamelen + 2 >= PATH_MAX) + return 0; + + memcpy(buf, dirname, dirnamelen); + buf[dirnamelen] = '/'; + dirnamelen++; + buf[dirnamelen] = '\0'; + + if (mod->path == NULL) { + const char *str = path_join(line, dirnamelen, buf); + if (str == NULL) + return 0; + mod->path = strdup(str); + if (mod->path == NULL) + return 0; + } + + p++; + for (p = strtok_r(p, " \t", &saveptr); p != NULL; + p = strtok_r(NULL, " \t", &saveptr)) { + struct kmod_module *depmod = NULL; + const char *path; + + path = path_join(p, dirnamelen, buf); + if (path == NULL) { + ERR(ctx, "could not join path '%s' and '%s'.\n", + dirname, p); + goto fail; + } + + err = kmod_module_new_from_path(ctx, path, &depmod); + if (err < 0) { + ERR(ctx, "ctx=%p path=%s error=%s\n", + ctx, path, strerror(-err)); + goto fail; + } + + DBG(ctx, "add dep: %s\n", path); + + list = kmod_list_prepend(list, depmod); + n++; + } + + DBG(ctx, "%d dependencies for %s\n", n, mod->name); + + mod->dep = list; + mod->n_dep = n; + return n; + +fail: + kmod_module_unref_list(list); + mod->init.dep = false; + return err; +} + +void kmod_module_set_visited(struct kmod_module *mod, bool visited) +{ + mod->visited = visited; +} + +void kmod_module_set_builtin(struct kmod_module *mod, bool builtin) +{ + mod->builtin = + builtin ? KMOD_MODULE_BUILTIN_YES : KMOD_MODULE_BUILTIN_NO; +} + +void kmod_module_set_required(struct kmod_module *mod, bool required) +{ + mod->required = required; +} + +bool kmod_module_is_builtin(struct kmod_module *mod) +{ + if (mod->builtin == KMOD_MODULE_BUILTIN_UNKNOWN) { + kmod_module_set_builtin(mod, + kmod_lookup_alias_is_builtin(mod->ctx, mod->name)); + } + + return mod->builtin == KMOD_MODULE_BUILTIN_YES; +} +/* + * Memory layout with alias: + * + * struct kmod_module { + * hashkey -----. + * alias -----. | + * name ----. | | + * } | | | + * name <----------' | | + * alias <-----------' | + * name\alias <--------' + * + * Memory layout without alias: + * + * struct kmod_module { + * hashkey ---. + * alias -----|----> NULL + * name ----. | + * } | | + * name <----------'-' + * + * @key is "name\alias" or "name" (in which case alias == NULL) + */ +static int kmod_module_new(struct kmod_ctx *ctx, const char *key, + const char *name, size_t namelen, + const char *alias, size_t aliaslen, + struct kmod_module **mod) +{ + struct kmod_module *m; + size_t keylen; + + m = kmod_pool_get_module(ctx, key); + if (m != NULL) { + *mod = kmod_module_ref(m); + return 0; + } + + if (alias == NULL) + keylen = namelen; + else + keylen = namelen + aliaslen + 1; + + m = malloc(sizeof(*m) + (alias == NULL ? 1 : 2) * (keylen + 1)); + if (m == NULL) + return -ENOMEM; + + memset(m, 0, sizeof(*m)); + + m->ctx = kmod_ref(ctx); + m->name = (char *)m + sizeof(*m); + memcpy(m->name, key, keylen + 1); + if (alias == NULL) { + m->hashkey = m->name; + m->alias = NULL; + } else { + m->name[namelen] = '\0'; + m->alias = m->name + namelen + 1; + m->hashkey = m->name + keylen + 1; + memcpy(m->hashkey, key, keylen + 1); + } + + m->refcount = 1; + kmod_pool_add_module(ctx, m, m->hashkey); + *mod = m; + + return 0; +} + +/** + * kmod_module_new_from_name: + * @ctx: kmod library context + * @name: name of the module + * @mod: where to save the created struct kmod_module + * + * Create a new struct kmod_module using the module name. @name can not be an + * alias, file name or anything else; it must be a module name. There's no + * check if the module exists in the system. + * + * This function is also used internally by many others that return a new + * struct kmod_module or a new list of modules. + * + * The initial refcount is 1, and needs to be decremented to release the + * resources of the kmod_module. Since libkmod keeps track of all + * kmod_modules created, they are all released upon @ctx destruction too. Do + * not unref @ctx before all the desired operations with the returned + * kmod_module are done. + * + * Returns: 0 on success or < 0 otherwise. It fails if name is not a valid + * module name or if memory allocation failed. + */ +KMOD_EXPORT int kmod_module_new_from_name(struct kmod_ctx *ctx, + const char *name, + struct kmod_module **mod) +{ + size_t namelen; + char name_norm[PATH_MAX]; + + if (ctx == NULL || name == NULL || mod == NULL) + return -ENOENT; + + modname_normalize(name, name_norm, &namelen); + + return kmod_module_new(ctx, name_norm, name_norm, namelen, NULL, 0, mod); +} + +int kmod_module_new_from_alias(struct kmod_ctx *ctx, const char *alias, + const char *name, struct kmod_module **mod) +{ + int err; + char key[PATH_MAX]; + size_t namelen = strlen(name); + size_t aliaslen = strlen(alias); + + if (namelen + aliaslen + 2 > PATH_MAX) + return -ENAMETOOLONG; + + memcpy(key, name, namelen); + memcpy(key + namelen + 1, alias, aliaslen + 1); + key[namelen] = '\\'; + + err = kmod_module_new(ctx, key, name, namelen, alias, aliaslen, mod); + if (err < 0) + return err; + + return 0; +} + +/** + * kmod_module_new_from_path: + * @ctx: kmod library context + * @path: path where to find the given module + * @mod: where to save the created struct kmod_module + * + * Create a new struct kmod_module using the module path. @path must be an + * existent file with in the filesystem and must be accessible to libkmod. + * + * The initial refcount is 1, and needs to be decremented to release the + * resources of the kmod_module. Since libkmod keeps track of all + * kmod_modules created, they are all released upon @ctx destruction too. Do + * not unref @ctx before all the desired operations with the returned + * kmod_module are done. + * + * If @path is relative, it's treated as relative to the current working + * directory. Otherwise, give an absolute path. + * + * Returns: 0 on success or < 0 otherwise. It fails if file does not exist, if + * it's not a valid file for a kmod_module or if memory allocation failed. + */ +KMOD_EXPORT int kmod_module_new_from_path(struct kmod_ctx *ctx, + const char *path, + struct kmod_module **mod) +{ + struct kmod_module *m; + int err; + struct stat st; + char name[PATH_MAX]; + char *abspath; + size_t namelen; + + if (ctx == NULL || path == NULL || mod == NULL) + return -ENOENT; + + abspath = path_make_absolute_cwd(path); + if (abspath == NULL) { + DBG(ctx, "no absolute path for %s\n", path); + return -ENOMEM; + } + + err = stat(abspath, &st); + if (err < 0) { + err = -errno; + DBG(ctx, "stat %s: %s\n", path, strerror(errno)); + free(abspath); + return err; + } + + if (path_to_modname(path, name, &namelen) == NULL) { + DBG(ctx, "could not get modname from path %s\n", path); + free(abspath); + return -ENOENT; + } + + m = kmod_pool_get_module(ctx, name); + if (m != NULL) { + if (m->path == NULL) + m->path = abspath; + else if (streq(m->path, abspath)) + free(abspath); + else { + ERR(ctx, "kmod_module '%s' already exists with different path: new-path='%s' old-path='%s'\n", + name, abspath, m->path); + free(abspath); + return -EEXIST; + } + + kmod_module_ref(m); + } else { + err = kmod_module_new(ctx, name, name, namelen, NULL, 0, &m); + if (err < 0) { + free(abspath); + return err; + } + + m->path = abspath; + } + + m->builtin = KMOD_MODULE_BUILTIN_NO; + *mod = m; + + return 0; +} + +/** + * kmod_module_unref: + * @mod: kmod module + * + * Drop a reference of the kmod module. If the refcount reaches zero, its + * resources are released. + * + * Returns: NULL if @mod is NULL or if the module was released. Otherwise it + * returns the passed @mod with its refcount decremented. + */ +KMOD_EXPORT struct kmod_module *kmod_module_unref(struct kmod_module *mod) +{ + if (mod == NULL) + return NULL; + + if (--mod->refcount > 0) + return mod; + + DBG(mod->ctx, "kmod_module %p released\n", mod); + + kmod_pool_del_module(mod->ctx, mod, mod->hashkey); + kmod_module_unref_list(mod->dep); + + if (mod->file) + kmod_file_unref(mod->file); + + kmod_unref(mod->ctx); + free(mod->options); + free(mod->path); + free(mod); + return NULL; +} + +/** + * kmod_module_ref: + * @mod: kmod module + * + * Take a reference of the kmod module, incrementing its refcount. + * + * Returns: the passed @module with its refcount incremented. + */ +KMOD_EXPORT struct kmod_module *kmod_module_ref(struct kmod_module *mod) +{ + if (mod == NULL) + return NULL; + + mod->refcount++; + + return mod; +} + +typedef int (*lookup_func)(struct kmod_ctx *ctx, const char *name, struct kmod_list **list) __attribute__((nonnull(1, 2, 3))); + +static int __kmod_module_new_from_lookup(struct kmod_ctx *ctx, const lookup_func lookup[], + size_t lookup_count, const char *s, + struct kmod_list **list) +{ + unsigned int i; + + for (i = 0; i < lookup_count; i++) { + int err; + + err = lookup[i](ctx, s, list); + if (err < 0 && err != -ENOSYS) + return err; + else if (*list != NULL) + return 0; + } + + return 0; +} + +/** + * kmod_module_new_from_lookup: + * @ctx: kmod library context + * @given_alias: alias to look for + * @list: an empty list where to save the list of modules matching + * @given_alias + * + * Create a new list of kmod modules using an alias or module name and lookup + * libkmod's configuration files and indexes in order to find the module. + * Once it's found in one of the places, it stops searching and create the + * list of modules that is saved in @list. + * + * The search order is: 1. aliases in configuration file; 2. module names in + * modules.dep index; 3. symbol aliases in modules.symbols index; 4. aliases + * from install commands; 5. builtin indexes from kernel. + * + * The initial refcount is 1, and needs to be decremented to release the + * resources of the kmod_module. The returned @list must be released by + * calling kmod_module_unref_list(). Since libkmod keeps track of all + * kmod_modules created, they are all released upon @ctx destruction too. Do + * not unref @ctx before all the desired operations with the returned list are + * completed. + * + * Returns: 0 on success or < 0 otherwise. It fails if any of the lookup + * methods failed, which is basically due to memory allocation fail. If module + * is not found, it still returns 0, but @list is an empty list. + */ +KMOD_EXPORT int kmod_module_new_from_lookup(struct kmod_ctx *ctx, + const char *given_alias, + struct kmod_list **list) +{ + static const lookup_func lookup[] = { + kmod_lookup_alias_from_config, + kmod_lookup_alias_from_moddep_file, + kmod_lookup_alias_from_symbols_file, + kmod_lookup_alias_from_commands, + kmod_lookup_alias_from_aliases_file, + kmod_lookup_alias_from_builtin_file, + kmod_lookup_alias_from_kernel_builtin_file, + }; + char alias[PATH_MAX]; + int err; + + if (ctx == NULL || given_alias == NULL) + return -ENOENT; + + if (list == NULL || *list != NULL) { + ERR(ctx, "An empty list is needed to create lookup\n"); + return -ENOSYS; + } + + if (alias_normalize(given_alias, alias, NULL) < 0) { + DBG(ctx, "invalid alias: %s\n", given_alias); + return -EINVAL; + } + + DBG(ctx, "input alias=%s, normalized=%s\n", given_alias, alias); + + err = __kmod_module_new_from_lookup(ctx, lookup, ARRAY_SIZE(lookup), + alias, list); + + DBG(ctx, "lookup=%s found=%d\n", alias, err >= 0 && *list); + + if (err < 0) { + kmod_module_unref_list(*list); + *list = NULL; + } + + return err; +} + +/** + * kmod_module_new_from_name_lookup: + * @ctx: kmod library context + * @modname: module name to look for + * @mod: returned module on success + * + * Lookup by module name, without considering possible aliases. This is similar + * to kmod_module_new_from_lookup(), but don't consider as source indexes and + * configurations that work with aliases. When succesful, this always resolves + * to one and only one module. + * + * The search order is: 1. module names in modules.dep index; + * 2. builtin indexes from kernel. + * + * The initial refcount is 1, and needs to be decremented to release the + * resources of the kmod_module. Since libkmod keeps track of all + * kmod_modules created, they are all released upon @ctx destruction too. Do + * not unref @ctx before all the desired operations with the returned list are + * completed. + * + * Returns: 0 on success or < 0 otherwise. It fails if any of the lookup + * methods failed, which is basically due to memory allocation failure. If + * module is not found, it still returns 0, but @mod is left untouched. + */ +KMOD_EXPORT int kmod_module_new_from_name_lookup(struct kmod_ctx *ctx, + const char *modname, + struct kmod_module **mod) +{ + static const lookup_func lookup[] = { + kmod_lookup_alias_from_moddep_file, + kmod_lookup_alias_from_builtin_file, + kmod_lookup_alias_from_kernel_builtin_file, + }; + char name_norm[PATH_MAX]; + struct kmod_list *list = NULL; + int err; + + if (ctx == NULL || modname == NULL || mod == NULL) + return -ENOENT; + + modname_normalize(modname, name_norm, NULL); + + DBG(ctx, "input modname=%s, normalized=%s\n", modname, name_norm); + + err = __kmod_module_new_from_lookup(ctx, lookup, ARRAY_SIZE(lookup), + name_norm, &list); + + DBG(ctx, "lookup=%s found=%d\n", name_norm, err >= 0 && list); + + if (err >= 0 && list != NULL) + *mod = kmod_module_get_module(list); + + kmod_module_unref_list(list); + + return err; +} + +/** + * kmod_module_unref_list: + * @list: list of kmod modules + * + * Drop a reference of each kmod module in @list and releases the resources + * taken by the list itself. + * + * Returns: 0 + */ +KMOD_EXPORT int kmod_module_unref_list(struct kmod_list *list) +{ + for (; list != NULL; list = kmod_list_remove(list)) + kmod_module_unref(list->data); + + return 0; +} + +/** + * kmod_module_get_filtered_blacklist: + * @ctx: kmod library context + * @input: list of kmod_module to be filtered with blacklist + * @output: where to save the new list + * + * This function should not be used. Use kmod_module_apply_filter instead. + * + * Given a list @input, this function filter it out with config's blacklist + * and save it in @output. + * + * Returns: 0 on success or < 0 otherwise. @output is saved with the updated + * list. + */ +KMOD_EXPORT int kmod_module_get_filtered_blacklist(const struct kmod_ctx *ctx, + const struct kmod_list *input, + struct kmod_list **output) +{ + return kmod_module_apply_filter(ctx, KMOD_FILTER_BLACKLIST, input, output); +} + +static const struct kmod_list *module_get_dependencies_noref(const struct kmod_module *mod) +{ + if (!mod->init.dep) { + /* lazy init */ + char *line = kmod_search_moddep(mod->ctx, mod->name); + + if (line == NULL) + return NULL; + + kmod_module_parse_depline((struct kmod_module *)mod, line); + free(line); + + if (!mod->init.dep) + return NULL; + } + + return mod->dep; +} + +/** + * kmod_module_get_dependencies: + * @mod: kmod module + * + * Search the modules.dep index to find the dependencies of the given @mod. + * The result is cached in @mod, so subsequent calls to this function will + * return the already searched list of modules. + * + * Returns: NULL on failure. Otherwise it returns a list of kmod modules + * that can be released by calling kmod_module_unref_list(). + */ +KMOD_EXPORT struct kmod_list *kmod_module_get_dependencies(const struct kmod_module *mod) +{ + struct kmod_list *l, *l_new, *list_new = NULL; + + if (mod == NULL) + return NULL; + + module_get_dependencies_noref(mod); + + kmod_list_foreach(l, mod->dep) { + l_new = kmod_list_append(list_new, kmod_module_ref(l->data)); + if (l_new == NULL) { + kmod_module_unref(l->data); + goto fail; + } + + list_new = l_new; + } + + return list_new; + +fail: + ERR(mod->ctx, "out of memory\n"); + kmod_module_unref_list(list_new); + return NULL; +} + +/** + * kmod_module_get_module: + * @entry: an entry in a list of kmod modules. + * + * Get the kmod module of this @entry in the list, increasing its refcount. + * After it's used, unref it. Since the refcount is incremented upon return, + * you still have to call kmod_module_unref_list() to release the list of kmod + * modules. + * + * Returns: NULL on failure or the kmod_module contained in this list entry + * with its refcount incremented. + */ +KMOD_EXPORT struct kmod_module *kmod_module_get_module(const struct kmod_list *entry) +{ + if (entry == NULL) + return NULL; + + return kmod_module_ref(entry->data); +} + +/** + * kmod_module_get_name: + * @mod: kmod module + * + * Get the name of this kmod module. Name is always available, independently + * if it was created by kmod_module_new_from_name() or another function and + * it's always normalized (dashes are replaced with underscores). + * + * Returns: the name of this kmod module. + */ +KMOD_EXPORT const char *kmod_module_get_name(const struct kmod_module *mod) +{ + if (mod == NULL) + return NULL; + + return mod->name; +} + +/** + * kmod_module_get_path: + * @mod: kmod module + * + * Get the path of this kmod module. If this kmod module was not created by + * path, it can search the modules.dep index in order to find out the module + * under context's dirname. + * + * Returns: the path of this kmod module or NULL if such information is not + * available. + */ +KMOD_EXPORT const char *kmod_module_get_path(const struct kmod_module *mod) +{ + char *line; + + if (mod == NULL) + return NULL; + + DBG(mod->ctx, "name='%s' path='%s'\n", mod->name, mod->path); + + if (mod->path != NULL) + return mod->path; + if (mod->init.dep) + return NULL; + + /* lazy init */ + line = kmod_search_moddep(mod->ctx, mod->name); + if (line == NULL) + return NULL; + + kmod_module_parse_depline((struct kmod_module *) mod, line); + free(line); + + return mod->path; +} + + +extern long delete_module(const char *name, unsigned int flags); + +/** + * kmod_module_remove_module: + * @mod: kmod module + * @flags: flags used when removing the module. + * KMOD_REMOVE_FORCE: force remove module regardless if it's still in + * use by a kernel subsystem or other process; passed directly to Linux kernel + * KMOD_REMOVE_NOWAIT: is always enforced, causing us to pass O_NONBLOCK to + * delete_module(2). + * KMOD_REMOVE_NOLOG: when module removal fails, do not log anything as the + * caller may want to handle retries and log when appropriate. + * + * Remove a module from Linux kernel. + * + * Returns: 0 on success or < 0 on failure. + */ +KMOD_EXPORT int kmod_module_remove_module(struct kmod_module *mod, + unsigned int flags) +{ + unsigned int libkmod_flags = flags & 0xff; + + int err; + + if (mod == NULL) + return -ENOENT; + + /* Filter out other flags and force ONONBLOCK */ + flags &= KMOD_REMOVE_FORCE; + flags |= KMOD_REMOVE_NOWAIT; + + err = delete_module(mod->name, flags); + if (err != 0) { + err = -errno; + if (!(libkmod_flags & KMOD_REMOVE_NOLOG)) + ERR(mod->ctx, "could not remove '%s': %m\n", mod->name); + } + + return err; +} + +extern long init_module(const void *mem, unsigned long len, const char *args); + +static int do_finit_module(struct kmod_module *mod, unsigned int flags, + const char *args) +{ + enum kmod_file_compression_type compression, kernel_compression; + unsigned int kernel_flags = 0; + int err; + + /* + * When module is not compressed or its compression type matches the + * one in use by the kernel, there is no need to read the file + * in userspace. Otherwise, re-use ENOSYS to trigger the same fallback + * as when finit_module() is not supported. + */ + compression = kmod_file_get_compression(mod->file); + kernel_compression = kmod_get_kernel_compression(mod->ctx); + if (!(compression == KMOD_FILE_COMPRESSION_NONE || + compression == kernel_compression)) + return -ENOSYS; + + if (compression != KMOD_FILE_COMPRESSION_NONE) + kernel_flags |= MODULE_INIT_COMPRESSED_FILE; + + if (flags & KMOD_INSERT_FORCE_VERMAGIC) + kernel_flags |= MODULE_INIT_IGNORE_VERMAGIC; + if (flags & KMOD_INSERT_FORCE_MODVERSION) + kernel_flags |= MODULE_INIT_IGNORE_MODVERSIONS; + + err = finit_module(kmod_file_get_fd(mod->file), args, kernel_flags); + if (err < 0) + err = -errno; + + return err; +} + +static int do_init_module(struct kmod_module *mod, unsigned int flags, + const char *args) +{ + struct kmod_elf *elf; + const void *mem; + off_t size; + int err; + + kmod_file_load_contents(mod->file); + + if (flags & (KMOD_INSERT_FORCE_VERMAGIC | KMOD_INSERT_FORCE_MODVERSION)) { + elf = kmod_file_get_elf(mod->file); + if (elf == NULL) { + err = -errno; + return err; + } + + if (flags & KMOD_INSERT_FORCE_MODVERSION) { + err = kmod_elf_strip_section(elf, "__versions"); + if (err < 0) + INFO(mod->ctx, "Failed to strip modversion: %s\n", strerror(-err)); + } + + if (flags & KMOD_INSERT_FORCE_VERMAGIC) { + err = kmod_elf_strip_vermagic(elf); + if (err < 0) + INFO(mod->ctx, "Failed to strip vermagic: %s\n", strerror(-err)); + } + + mem = kmod_elf_get_memory(elf); + } else { + mem = kmod_file_get_contents(mod->file); + } + size = kmod_file_get_size(mod->file); + + err = init_module(mem, size, args); + if (err < 0) + err = -errno; + + return err; +} + +/** + * kmod_module_insert_module: + * @mod: kmod module + * @flags: flags are not passed to Linux Kernel, but instead they dictate the + * behavior of this function, valid flags are + * KMOD_INSERT_FORCE_VERMAGIC: ignore kernel version magic; + * KMOD_INSERT_FORCE_MODVERSION: ignore symbol version hashes. + * @options: module's options to pass to Linux Kernel. + * + * Insert a module in Linux kernel. It opens the file pointed by @mod, + * mmap'ing it and passing to kernel. + * + * Returns: 0 on success or < 0 on failure. If module is already loaded it + * returns -EEXIST. + */ +KMOD_EXPORT int kmod_module_insert_module(struct kmod_module *mod, + unsigned int flags, + const char *options) +{ + int err; + const char *path; + const char *args = options ? options : ""; + + if (mod == NULL) + return -ENOENT; + + path = kmod_module_get_path(mod); + if (path == NULL) { + ERR(mod->ctx, "could not find module by name='%s'\n", mod->name); + return -ENOENT; + } + + if (!mod->file) { + mod->file = kmod_file_open(mod->ctx, path); + if (mod->file == NULL) { + err = -errno; + return err; + } + } + + err = do_finit_module(mod, flags, args); + if (err == -ENOSYS) + err = do_init_module(mod, flags, args); + + if (err < 0) + INFO(mod->ctx, "Failed to insert module '%s': %s\n", + path, strerror(-err)); + + return err; +} + +static bool module_is_blacklisted(struct kmod_module *mod) +{ + struct kmod_ctx *ctx = mod->ctx; + const struct kmod_config *config = kmod_get_config(ctx); + const struct kmod_list *bl = config->blacklists; + const struct kmod_list *l; + + kmod_list_foreach(l, bl) { + const char *modname = kmod_blacklist_get_modname(l); + + if (streq(modname, mod->name)) + return true; + } + + return false; +} + +/** + * kmod_module_apply_filter + * @ctx: kmod library context + * @filter_type: bitmask to filter modules out, valid types are + * KMOD_FILTER_BLACKLIST: filter modules in blacklist out; + * KMOD_FILTER_BUILTIN: filter builtin modules out. + * @input: list of kmod_module to be filtered + * @output: where to save the new list + * + * Given a list @input, this function filter it out by the filter mask + * and save it in @output. + * + * Returns: 0 on success or < 0 otherwise. @output is saved with the updated + * list. + */ +KMOD_EXPORT int kmod_module_apply_filter(const struct kmod_ctx *ctx, + enum kmod_filter filter_type, + const struct kmod_list *input, + struct kmod_list **output) +{ + const struct kmod_list *li; + + if (ctx == NULL || output == NULL) + return -ENOENT; + + *output = NULL; + if (input == NULL) + return 0; + + kmod_list_foreach(li, input) { + struct kmod_module *mod = li->data; + struct kmod_list *node; + + if ((filter_type & KMOD_FILTER_BLACKLIST) && + module_is_blacklisted(mod)) + continue; + + if ((filter_type & KMOD_FILTER_BUILTIN) + && kmod_module_is_builtin(mod)) + continue; + + node = kmod_list_append(*output, mod); + if (node == NULL) + goto fail; + + *output = node; + kmod_module_ref(mod); + } + + return 0; + +fail: + kmod_module_unref_list(*output); + *output = NULL; + return -ENOMEM; +} + +static int command_do(struct kmod_module *mod, const char *type, + const char *cmd) +{ + const char *modname = kmod_module_get_name(mod); + int err; + + DBG(mod->ctx, "%s %s\n", type, cmd); + + setenv("MODPROBE_MODULE", modname, 1); + err = system(cmd); + unsetenv("MODPROBE_MODULE"); + + if (err == -1) { + ERR(mod->ctx, "Could not run %s command '%s' for module %s: %m\n", + type, cmd, modname); + return -EINVAL; + } + + if (WEXITSTATUS(err)) { + ERR(mod->ctx, "Error running %s command '%s' for module %s: retcode %d\n", + type, cmd, modname, WEXITSTATUS(err)); + return -EINVAL; + } + + return 0; +} + +struct probe_insert_cb { + int (*run_install)(struct kmod_module *m, const char *cmd, void *data); + void *data; +}; + +static int module_do_install_commands(struct kmod_module *mod, + const char *options, + struct probe_insert_cb *cb) +{ + const char *command = kmod_module_get_install_commands(mod); + char *p; + _cleanup_free_ char *cmd; + int err; + size_t cmdlen, options_len, varlen; + + assert(command); + + if (options == NULL) + options = ""; + + options_len = strlen(options); + cmdlen = strlen(command); + varlen = sizeof("$CMDLINE_OPTS") - 1; + + cmd = memdup(command, cmdlen + 1); + if (cmd == NULL) + return -ENOMEM; + + while ((p = strstr(cmd, "$CMDLINE_OPTS")) != NULL) { + size_t prefixlen = p - cmd; + size_t suffixlen = cmdlen - prefixlen - varlen; + size_t slen = cmdlen - varlen + options_len; + char *suffix = p + varlen; + char *s = malloc(slen + 1); + if (!s) + return -ENOMEM; + + memcpy(s, cmd, p - cmd); + memcpy(s + prefixlen, options, options_len); + memcpy(s + prefixlen + options_len, suffix, suffixlen); + s[slen] = '\0'; + + free(cmd); + cmd = s; + cmdlen = slen; + } + + if (cb->run_install != NULL) + err = cb->run_install(mod, cmd, cb->data); + else + err = command_do(mod, "install", cmd); + + return err; +} + +static char *module_options_concat(const char *opt, const char *xopt) +{ + // TODO: we might need to check if xopt overrides options on opt + size_t optlen = opt == NULL ? 0 : strlen(opt); + size_t xoptlen = xopt == NULL ? 0 : strlen(xopt); + char *r; + + if (optlen == 0 && xoptlen == 0) + return NULL; + + r = malloc(optlen + xoptlen + 2); + + if (opt != NULL) { + memcpy(r, opt, optlen); + r[optlen] = ' '; + optlen++; + } + + if (xopt != NULL) + memcpy(r + optlen, xopt, xoptlen); + + r[optlen + xoptlen] = '\0'; + + return r; +} + +static int __kmod_module_get_probe_list(struct kmod_module *mod, + bool required, + bool ignorecmd, + struct kmod_list **list); + +/* re-entrant */ +static int __kmod_module_fill_softdep(struct kmod_module *mod, + struct kmod_list **list) +{ + struct kmod_list *pre = NULL, *post = NULL, *l; + int err; + + err = kmod_module_get_softdeps(mod, &pre, &post); + if (err < 0) { + ERR(mod->ctx, "could not get softdep: %s\n", + strerror(-err)); + goto fail; + } + + kmod_list_foreach(l, pre) { + struct kmod_module *m = l->data; + err = __kmod_module_get_probe_list(m, false, false, list); + if (err < 0) + goto fail; + } + + l = kmod_list_append(*list, kmod_module_ref(mod)); + if (l == NULL) { + kmod_module_unref(mod); + err = -ENOMEM; + goto fail; + } + *list = l; + mod->ignorecmd = (pre != NULL || post != NULL); + + kmod_list_foreach(l, post) { + struct kmod_module *m = l->data; + err = __kmod_module_get_probe_list(m, false, false, list); + if (err < 0) + goto fail; + } + +fail: + kmod_module_unref_list(pre); + kmod_module_unref_list(post); + + return err; +} + +/* re-entrant */ +static int __kmod_module_get_probe_list(struct kmod_module *mod, + bool required, + bool ignorecmd, + struct kmod_list **list) +{ + struct kmod_list *dep, *l; + int err = 0; + + if (mod->visited) { + DBG(mod->ctx, "Ignore module '%s': already visited\n", + mod->name); + return 0; + } + mod->visited = true; + + dep = kmod_module_get_dependencies(mod); + if (required) { + /* + * Called from kmod_module_probe_insert_module(); set the + * ->required flag on mod and all its dependencies before + * they are possibly visited through some softdeps. + */ + mod->required = true; + kmod_list_foreach(l, dep) { + struct kmod_module *m = l->data; + m->required = true; + } + } + + kmod_list_foreach(l, dep) { + struct kmod_module *m = l->data; + err = __kmod_module_fill_softdep(m, list); + if (err < 0) + goto finish; + } + + if (ignorecmd) { + l = kmod_list_append(*list, kmod_module_ref(mod)); + if (l == NULL) { + kmod_module_unref(mod); + err = -ENOMEM; + goto finish; + } + *list = l; + mod->ignorecmd = true; + } else + err = __kmod_module_fill_softdep(mod, list); + +finish: + kmod_module_unref_list(dep); + return err; +} + +static int kmod_module_get_probe_list(struct kmod_module *mod, + bool ignorecmd, + struct kmod_list **list) +{ + int err; + + assert(mod != NULL); + assert(list != NULL && *list == NULL); + + /* + * Make sure we don't get screwed by previous calls to this function + */ + kmod_set_modules_visited(mod->ctx, false); + kmod_set_modules_required(mod->ctx, false); + + err = __kmod_module_get_probe_list(mod, true, ignorecmd, list); + if (err < 0) { + kmod_module_unref_list(*list); + *list = NULL; + } + + return err; +} + +/** + * kmod_module_probe_insert_module: + * @mod: kmod module + * @flags: flags are not passed to Linux Kernel, but instead they dictate the + * behavior of this function, valid flags are + * KMOD_PROBE_FORCE_VERMAGIC: ignore kernel version magic; + * KMOD_PROBE_FORCE_MODVERSION: ignore symbol version hashes; + * KMOD_PROBE_IGNORE_COMMAND: whether the probe should ignore install + * commands and softdeps configured in the system; + * KMOD_PROBE_IGNORE_LOADED: do not check whether the module is already + * live in kernel or not; + * KMOD_PROBE_DRY_RUN: dry run, do not insert module, just call the + * associated callback function; + * KMOD_PROBE_FAIL_ON_LOADED: if KMOD_PROBE_IGNORE_LOADED is not specified + * and the module is already live in kernel, the function will fail if this + * flag is specified; + * KMOD_PROBE_APPLY_BLACKLIST_ALL: probe will apply KMOD_FILTER_BLACKLIST + * filter to this module and its dependencies. If any of the dependencies (or + * the module) is blacklisted, the probe will fail, unless the blacklisted + * module is already live in kernel; + * KMOD_PROBE_APPLY_BLACKLIST: probe will fail if the module is blacklisted; + * KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY: probe will fail if the module is an + * alias and is blacklisted. + * @extra_options: module's options to pass to Linux Kernel. It applies only + * to @mod, not to its dependencies. + * @run_install: function to run when @mod is backed by an install command. + * @data: data to give back to @run_install callback + * @print_action: function to call with the action being taken (install or + * insmod). It's useful for tools like modprobe when running with verbose + * output or in dry-run mode. + * + * Insert a module in Linux kernel resolving dependencies, soft dependencies, + * install commands and applying blacklist. + * + * If @run_install is NULL, this function will fork and exec by calling + * system(3). Don't pass a NULL argument in @run_install if your binary is + * setuid/setgid (see warning in system(3)). If you need control over the + * execution of an install command, give a callback function instead. + * + * Returns: 0 on success, > 0 if stopped by a reason given in @flags or < 0 on + * failure. + */ +KMOD_EXPORT int kmod_module_probe_insert_module(struct kmod_module *mod, + unsigned int flags, const char *extra_options, + int (*run_install)(struct kmod_module *m, + const char *cmd, void *data), + const void *data, + void (*print_action)(struct kmod_module *m, + bool install, + const char *options)) +{ + struct kmod_list *list = NULL, *l; + struct probe_insert_cb cb; + int err; + + if (mod == NULL) + return -ENOENT; + + if (!(flags & KMOD_PROBE_IGNORE_LOADED) + && module_is_inkernel(mod)) { + if (flags & KMOD_PROBE_FAIL_ON_LOADED) + return -EEXIST; + else + return 0; + } + + /* + * Ugly assignement + check. We need to check if we were told to check + * blacklist and also return the reason why we failed. + * KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY will take effect only if the + * module is an alias, so we also need to check it + */ + if ((mod->alias != NULL && ((err = flags & KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY))) + || (err = flags & KMOD_PROBE_APPLY_BLACKLIST_ALL) + || (err = flags & KMOD_PROBE_APPLY_BLACKLIST)) { + if (module_is_blacklisted(mod)) + return err; + } + + err = kmod_module_get_probe_list(mod, + !!(flags & KMOD_PROBE_IGNORE_COMMAND), &list); + if (err < 0) + return err; + + if (flags & KMOD_PROBE_APPLY_BLACKLIST_ALL) { + struct kmod_list *filtered = NULL; + + err = kmod_module_apply_filter(mod->ctx, + KMOD_FILTER_BLACKLIST, list, &filtered); + if (err < 0) + return err; + + kmod_module_unref_list(list); + if (filtered == NULL) + return KMOD_PROBE_APPLY_BLACKLIST_ALL; + + list = filtered; + } + + cb.run_install = run_install; + cb.data = (void *) data; + + kmod_list_foreach(l, list) { + struct kmod_module *m = l->data; + const char *moptions = kmod_module_get_options(m); + const char *cmd = kmod_module_get_install_commands(m); + char *options; + + if (!(flags & KMOD_PROBE_IGNORE_LOADED) + && module_is_inkernel(m)) { + DBG(mod->ctx, "Ignoring module '%s': already loaded\n", + m->name); + err = -EEXIST; + goto finish_module; + } + + options = module_options_concat(moptions, + m == mod ? extra_options : NULL); + + if (cmd != NULL && !m->ignorecmd) { + if (print_action != NULL) + print_action(m, true, options ?: ""); + + if (!(flags & KMOD_PROBE_DRY_RUN)) + err = module_do_install_commands(m, options, + &cb); + } else { + if (print_action != NULL) + print_action(m, false, options ?: ""); + + if (!(flags & KMOD_PROBE_DRY_RUN)) + err = kmod_module_insert_module(m, flags, + options); + } + + free(options); + +finish_module: + /* + * Treat "already loaded" error. If we were told to stop on + * already loaded and the module being loaded is not a softdep + * or dep, bail out. Otherwise, just ignore and continue. + * + * We need to check here because of race conditions. We + * checked first if module was already loaded but it may have + * been loaded between the check and the moment we try to + * insert it. + */ + if (err == -EEXIST && m == mod && + (flags & KMOD_PROBE_FAIL_ON_LOADED)) + break; + + /* + * Ignore errors from softdeps + */ + if (err == -EEXIST || !m->required) + err = 0; + + else if (err < 0) + break; + } + + kmod_module_unref_list(list); + return err; +} + +/** + * kmod_module_get_options: + * @mod: kmod module + * + * Get options of this kmod module. Options come from the configuration file + * and are cached in @mod. The first call to this function will search for + * this module in configuration and subsequent calls return the cached string. + * + * Returns: a string with all the options separated by spaces. This string is + * owned by @mod, do not free it. + */ +KMOD_EXPORT const char *kmod_module_get_options(const struct kmod_module *mod) +{ + if (mod == NULL) + return NULL; + + if (!mod->init.options) { + /* lazy init */ + struct kmod_module *m = (struct kmod_module *)mod; + const struct kmod_list *l; + const struct kmod_config *config; + char *opts = NULL; + size_t optslen = 0; + + config = kmod_get_config(mod->ctx); + + kmod_list_foreach(l, config->options) { + const char *modname = kmod_option_get_modname(l); + const char *str; + size_t len; + void *tmp; + + DBG(mod->ctx, "modname=%s mod->name=%s mod->alias=%s\n", modname, mod->name, mod->alias); + if (!(streq(modname, mod->name) || (mod->alias != NULL && + streq(modname, mod->alias)))) + continue; + + DBG(mod->ctx, "passed = modname=%s mod->name=%s mod->alias=%s\n", modname, mod->name, mod->alias); + str = kmod_option_get_options(l); + len = strlen(str); + if (len < 1) + continue; + + tmp = realloc(opts, optslen + len + 2); + if (tmp == NULL) { + free(opts); + goto failed; + } + + opts = tmp; + + if (optslen > 0) { + opts[optslen] = ' '; + optslen++; + } + + memcpy(opts + optslen, str, len); + optslen += len; + opts[optslen] = '\0'; + } + + m->init.options = true; + m->options = opts; + } + + return mod->options; + +failed: + ERR(mod->ctx, "out of memory\n"); + return NULL; +} + +/** + * kmod_module_get_install_commands: + * @mod: kmod module + * + * Get install commands for this kmod module. Install commands come from the + * configuration file and are cached in @mod. The first call to this function + * will search for this module in configuration and subsequent calls return + * the cached string. The install commands are returned as they were in the + * configuration, concatenated by ';'. No other processing is made in this + * string. + * + * Returns: a string with all install commands separated by semicolons. This + * string is owned by @mod, do not free it. + */ +KMOD_EXPORT const char *kmod_module_get_install_commands(const struct kmod_module *mod) +{ + if (mod == NULL) + return NULL; + + if (!mod->init.install_commands) { + /* lazy init */ + struct kmod_module *m = (struct kmod_module *)mod; + const struct kmod_list *l; + const struct kmod_config *config; + + config = kmod_get_config(mod->ctx); + + kmod_list_foreach(l, config->install_commands) { + const char *modname = kmod_command_get_modname(l); + + if (fnmatch(modname, mod->name, 0) != 0) + continue; + + m->install_commands = kmod_command_get_command(l); + + /* + * find only the first command, as modprobe from + * module-init-tools does + */ + break; + } + + m->init.install_commands = true; + } + + return mod->install_commands; +} + +void kmod_module_set_install_commands(struct kmod_module *mod, const char *cmd) +{ + mod->init.install_commands = true; + mod->install_commands = cmd; +} + +static struct kmod_list *lookup_softdep(struct kmod_ctx *ctx, const char * const * array, unsigned int count) +{ + struct kmod_list *ret = NULL; + unsigned i; + + for (i = 0; i < count; i++) { + const char *depname = array[i]; + struct kmod_list *lst = NULL; + int err; + + err = kmod_module_new_from_lookup(ctx, depname, &lst); + if (err < 0) { + ERR(ctx, "failed to lookup soft dependency '%s', continuing anyway.\n", depname); + continue; + } else if (lst != NULL) + ret = kmod_list_append_list(ret, lst); + } + return ret; +} + +/** + * kmod_module_get_softdeps: + * @mod: kmod module + * @pre: where to save the list of preceding soft dependencies. + * @post: where to save the list of post soft dependencies. + * + * Get soft dependencies for this kmod module. Soft dependencies come + * from configuration file and are not cached in @mod because it may include + * dependency cycles that would make we leak kmod_module. Any call + * to this function will search for this module in configuration, allocate a + * list and return the result. + * + * Both @pre and @post are newly created list of kmod_module and + * should be unreferenced with kmod_module_unref_list(). + * + * Returns: 0 on success or < 0 otherwise. + */ +KMOD_EXPORT int kmod_module_get_softdeps(const struct kmod_module *mod, + struct kmod_list **pre, + struct kmod_list **post) +{ + const struct kmod_list *l; + const struct kmod_config *config; + + if (mod == NULL || pre == NULL || post == NULL) + return -ENOENT; + + assert(*pre == NULL); + assert(*post == NULL); + + config = kmod_get_config(mod->ctx); + + kmod_list_foreach(l, config->softdeps) { + const char *modname = kmod_softdep_get_name(l); + const char * const *array; + unsigned count; + + if (fnmatch(modname, mod->name, 0) != 0) + continue; + + array = kmod_softdep_get_pre(l, &count); + *pre = lookup_softdep(mod->ctx, array, count); + array = kmod_softdep_get_post(l, &count); + *post = lookup_softdep(mod->ctx, array, count); + + /* + * find only the first command, as modprobe from + * module-init-tools does + */ + break; + } + + return 0; +} + +/** + * kmod_module_get_remove_commands: + * @mod: kmod module + * + * Get remove commands for this kmod module. Remove commands come from the + * configuration file and are cached in @mod. The first call to this function + * will search for this module in configuration and subsequent calls return + * the cached string. The remove commands are returned as they were in the + * configuration, concatenated by ';'. No other processing is made in this + * string. + * + * Returns: a string with all remove commands separated by semicolons. This + * string is owned by @mod, do not free it. + */ +KMOD_EXPORT const char *kmod_module_get_remove_commands(const struct kmod_module *mod) +{ + if (mod == NULL) + return NULL; + + if (!mod->init.remove_commands) { + /* lazy init */ + struct kmod_module *m = (struct kmod_module *)mod; + const struct kmod_list *l; + const struct kmod_config *config; + + config = kmod_get_config(mod->ctx); + + kmod_list_foreach(l, config->remove_commands) { + const char *modname = kmod_command_get_modname(l); + + if (fnmatch(modname, mod->name, 0) != 0) + continue; + + m->remove_commands = kmod_command_get_command(l); + + /* + * find only the first command, as modprobe from + * module-init-tools does + */ + break; + } + + m->init.remove_commands = true; + } + + return mod->remove_commands; +} + +void kmod_module_set_remove_commands(struct kmod_module *mod, const char *cmd) +{ + mod->init.remove_commands = true; + mod->remove_commands = cmd; +} + +/** + * SECTION:libkmod-loaded + * @short_description: currently loaded modules + * + * Information about currently loaded modules, as reported by Linux kernel. + * These information are not cached by libkmod and are always read from /sys + * and /proc/modules. + */ + +/** + * kmod_module_new_from_loaded: + * @ctx: kmod library context + * @list: where to save the list of loaded modules + * + * Create a new list of kmod modules with all modules currently loaded in + * kernel. It uses /proc/modules to get the names of loaded modules and to + * create kmod modules by calling kmod_module_new_from_name() in each of them. + * They are put in @list in no particular order. + * + * The initial refcount is 1, and needs to be decremented to release the + * resources of the kmod_module. The returned @list must be released by + * calling kmod_module_unref_list(). Since libkmod keeps track of all + * kmod_modules created, they are all released upon @ctx destruction too. Do + * not unref @ctx before all the desired operations with the returned list are + * completed. + * + * Returns: 0 on success or < 0 on error. + */ +KMOD_EXPORT int kmod_module_new_from_loaded(struct kmod_ctx *ctx, + struct kmod_list **list) +{ + struct kmod_list *l = NULL; + FILE *fp; + char line[4096]; + + if (ctx == NULL || list == NULL) + return -ENOENT; + + fp = fopen("/proc/modules", "re"); + if (fp == NULL) { + int err = -errno; + ERR(ctx, "could not open /proc/modules: %s\n", strerror(errno)); + return err; + } + + while (fgets(line, sizeof(line), fp)) { + struct kmod_module *m; + struct kmod_list *node; + int err; + size_t len = strlen(line); + char *saveptr, *name = strtok_r(line, " \t", &saveptr); + + err = kmod_module_new_from_name(ctx, name, &m); + if (err < 0) { + ERR(ctx, "could not get module from name '%s': %s\n", + name, strerror(-err)); + goto eat_line; + } + + node = kmod_list_append(l, m); + if (node) + l = node; + else { + ERR(ctx, "out of memory\n"); + kmod_module_unref(m); + } +eat_line: + while (line[len - 1] != '\n' && fgets(line, sizeof(line), fp)) + len = strlen(line); + } + + fclose(fp); + *list = l; + + return 0; +} + +/** + * kmod_module_initstate_str: + * @state: the state as returned by kmod_module_get_initstate() + * + * Translate a initstate to a string. + * + * Returns: the string associated to the @state. This string is statically + * allocated, do not free it. + */ +KMOD_EXPORT const char *kmod_module_initstate_str(enum kmod_module_initstate state) +{ + switch (state) { + case KMOD_MODULE_BUILTIN: + return "builtin"; + case KMOD_MODULE_LIVE: + return "live"; + case KMOD_MODULE_COMING: + return "coming"; + case KMOD_MODULE_GOING: + return "going"; + default: + return NULL; + } +} + +/** + * kmod_module_get_initstate: + * @mod: kmod module + * + * Get the initstate of this @mod, as returned by Linux Kernel, by reading + * /sys filesystem. + * + * Returns: < 0 on error or module state if module is found in kernel, valid states are + * KMOD_MODULE_BUILTIN: module is builtin; + * KMOD_MODULE_LIVE: module is live in kernel; + * KMOD_MODULE_COMING: module is being loaded; + * KMOD_MODULE_GOING: module is being unloaded. + */ +KMOD_EXPORT int kmod_module_get_initstate(const struct kmod_module *mod) +{ + char path[PATH_MAX], buf[32]; + int fd, err, pathlen; + + if (mod == NULL) + return -ENOENT; + + /* remove const: this can only change internal state */ + if (kmod_module_is_builtin((struct kmod_module *)mod)) + return KMOD_MODULE_BUILTIN; + + pathlen = snprintf(path, sizeof(path), + "/sys/module/%s/initstate", mod->name); + if (pathlen >= (int)sizeof(path)) { + /* Too long path was truncated */ + return -ENAMETOOLONG; + } + fd = open(path, O_RDONLY|O_CLOEXEC); + if (fd < 0) { + err = -errno; + + DBG(mod->ctx, "could not open '%s': %s\n", + path, strerror(-err)); + + if (pathlen > (int)sizeof("/initstate") - 1) { + struct stat st; + path[pathlen - (sizeof("/initstate") - 1)] = '\0'; + if (stat(path, &st) == 0 && S_ISDIR(st.st_mode)) + return KMOD_MODULE_COMING; + } + + DBG(mod->ctx, "could not open '%s': %s\n", + path, strerror(-err)); + return err; + } + + err = read_str_safe(fd, buf, sizeof(buf)); + close(fd); + if (err < 0) { + ERR(mod->ctx, "could not read from '%s': %s\n", + path, strerror(-err)); + return err; + } + + if (streq(buf, "live\n")) + return KMOD_MODULE_LIVE; + else if (streq(buf, "coming\n")) + return KMOD_MODULE_COMING; + else if (streq(buf, "going\n")) + return KMOD_MODULE_GOING; + + ERR(mod->ctx, "unknown %s: '%s'\n", path, buf); + return -EINVAL; +} + +/** + * kmod_module_get_size: + * @mod: kmod module + * + * Get the size of this kmod module as returned by Linux kernel. If supported, + * the size is read from the coresize attribute in /sys/module. For older + * kernels, this falls back on /proc/modules and searches for the specified + * module to get its size. + * + * Returns: the size of this kmod module. + */ +KMOD_EXPORT long kmod_module_get_size(const struct kmod_module *mod) +{ + FILE *fp; + char line[4096]; + int lineno = 0; + long size = -ENOENT; + int dfd, cfd; + + if (mod == NULL) + return -ENOENT; + + /* try to open the module dir in /sys. If this fails, don't + * bother trying to find the size as we know the module isn't + * loaded. + */ + snprintf(line, sizeof(line), "/sys/module/%s", mod->name); + dfd = open(line, O_RDONLY|O_CLOEXEC); + if (dfd < 0) + return -errno; + + /* available as of linux 3.3.x */ + cfd = openat(dfd, "coresize", O_RDONLY|O_CLOEXEC); + if (cfd >= 0) { + if (read_str_long(cfd, &size, 10) < 0) + ERR(mod->ctx, "failed to read coresize from %s\n", line); + close(cfd); + goto done; + } + + /* fall back on parsing /proc/modules */ + fp = fopen("/proc/modules", "re"); + if (fp == NULL) { + int err = -errno; + ERR(mod->ctx, + "could not open /proc/modules: %s\n", strerror(errno)); + close(dfd); + return err; + } + + while (fgets(line, sizeof(line), fp)) { + size_t len = strlen(line); + char *saveptr, *endptr, *tok = strtok_r(line, " \t", &saveptr); + long value; + + lineno++; + if (tok == NULL || !streq(tok, mod->name)) + goto eat_line; + + tok = strtok_r(NULL, " \t", &saveptr); + if (tok == NULL) { + ERR(mod->ctx, + "invalid line format at /proc/modules:%d\n", lineno); + break; + } + + value = strtol(tok, &endptr, 10); + if (endptr == tok || *endptr != '\0') { + ERR(mod->ctx, + "invalid line format at /proc/modules:%d\n", lineno); + break; + } + + size = value; + break; +eat_line: + while (line[len - 1] != '\n' && fgets(line, sizeof(line), fp)) + len = strlen(line); + } + fclose(fp); + +done: + close(dfd); + return size; +} + +/** + * kmod_module_get_refcnt: + * @mod: kmod module + * + * Get the ref count of this @mod, as returned by Linux Kernel, by reading + * /sys filesystem. + * + * Returns: the reference count on success or < 0 on failure. + */ +KMOD_EXPORT int kmod_module_get_refcnt(const struct kmod_module *mod) +{ + char path[PATH_MAX]; + long refcnt; + int fd, err; + + if (mod == NULL) + return -ENOENT; + + snprintf(path, sizeof(path), "/sys/module/%s/refcnt", mod->name); + fd = open(path, O_RDONLY|O_CLOEXEC); + if (fd < 0) { + err = -errno; + DBG(mod->ctx, "could not open '%s': %s\n", + path, strerror(errno)); + return err; + } + + err = read_str_long(fd, &refcnt, 10); + close(fd); + if (err < 0) { + ERR(mod->ctx, "could not read integer from '%s': '%s'\n", + path, strerror(-err)); + return err; + } + + return (int)refcnt; +} + +/** + * kmod_module_get_holders: + * @mod: kmod module + * + * Get a list of kmod modules that are holding this @mod, as returned by Linux + * Kernel. After use, free the @list by calling kmod_module_unref_list(). + * + * Returns: a new list of kmod modules on success or NULL on failure. + */ +KMOD_EXPORT struct kmod_list *kmod_module_get_holders(const struct kmod_module *mod) +{ + char dname[PATH_MAX]; + struct kmod_list *list = NULL; + struct dirent *dent; + DIR *d; + + if (mod == NULL || mod->ctx == NULL) + return NULL; + + snprintf(dname, sizeof(dname), "/sys/module/%s/holders", mod->name); + + d = opendir(dname); + if (d == NULL) { + ERR(mod->ctx, "could not open '%s': %s\n", + dname, strerror(errno)); + return NULL; + } + + for (dent = readdir(d); dent != NULL; dent = readdir(d)) { + struct kmod_module *holder; + struct kmod_list *l; + int err; + + if (dent->d_name[0] == '.') { + if (dent->d_name[1] == '\0' || + (dent->d_name[1] == '.' && dent->d_name[2] == '\0')) + continue; + } + + err = kmod_module_new_from_name(mod->ctx, dent->d_name, + &holder); + if (err < 0) { + ERR(mod->ctx, "could not create module for '%s': %s\n", + dent->d_name, strerror(-err)); + goto fail; + } + + l = kmod_list_append(list, holder); + if (l != NULL) { + list = l; + } else { + ERR(mod->ctx, "out of memory\n"); + kmod_module_unref(holder); + goto fail; + } + } + + closedir(d); + return list; + +fail: + closedir(d); + kmod_module_unref_list(list); + return NULL; +} + +struct kmod_module_section { + unsigned long address; + char name[]; +}; + +static void kmod_module_section_free(struct kmod_module_section *section) +{ + free(section); +} + +/** + * kmod_module_get_sections: + * @mod: kmod module + * + * Get a list of kmod sections of this @mod, as returned by Linux Kernel. The + * structure contained in this list is internal to libkmod and their fields + * can be obtained by calling kmod_module_section_get_name() and + * kmod_module_section_get_address(). + * + * After use, free the @list by calling kmod_module_section_free_list(). + * + * Returns: a new list of kmod module sections on success or NULL on failure. + */ +KMOD_EXPORT struct kmod_list *kmod_module_get_sections(const struct kmod_module *mod) +{ + char dname[PATH_MAX]; + struct kmod_list *list = NULL; + struct dirent *dent; + DIR *d; + int dfd; + + if (mod == NULL) + return NULL; + + snprintf(dname, sizeof(dname), "/sys/module/%s/sections", mod->name); + + d = opendir(dname); + if (d == NULL) { + ERR(mod->ctx, "could not open '%s': %s\n", + dname, strerror(errno)); + return NULL; + } + + dfd = dirfd(d); + + for (dent = readdir(d); dent; dent = readdir(d)) { + struct kmod_module_section *section; + struct kmod_list *l; + unsigned long address; + size_t namesz; + int fd, err; + + if (dent->d_name[0] == '.') { + if (dent->d_name[1] == '\0' || + (dent->d_name[1] == '.' && dent->d_name[2] == '\0')) + continue; + } + + fd = openat(dfd, dent->d_name, O_RDONLY|O_CLOEXEC); + if (fd < 0) { + ERR(mod->ctx, "could not open '%s/%s': %m\n", + dname, dent->d_name); + goto fail; + } + + err = read_str_ulong(fd, &address, 16); + close(fd); + if (err < 0) { + ERR(mod->ctx, "could not read long from '%s/%s': %m\n", + dname, dent->d_name); + goto fail; + } + + namesz = strlen(dent->d_name) + 1; + section = malloc(sizeof(*section) + namesz); + + if (section == NULL) { + ERR(mod->ctx, "out of memory\n"); + goto fail; + } + + section->address = address; + memcpy(section->name, dent->d_name, namesz); + + l = kmod_list_append(list, section); + if (l != NULL) { + list = l; + } else { + ERR(mod->ctx, "out of memory\n"); + free(section); + goto fail; + } + } + + closedir(d); + return list; + +fail: + closedir(d); + kmod_module_unref_list(list); + return NULL; +} + +/** + * kmod_module_section_get_module_name: + * @entry: a list entry representing a kmod module section + * + * Get the name of a kmod module section. + * + * After use, free the @list by calling kmod_module_section_free_list(). + * + * Returns: the name of this kmod module section on success or NULL on + * failure. The string is owned by the section, do not free it. + */ +KMOD_EXPORT const char *kmod_module_section_get_name(const struct kmod_list *entry) +{ + struct kmod_module_section *section; + + if (entry == NULL) + return NULL; + + section = entry->data; + return section->name; +} + +/** + * kmod_module_section_get_address: + * @entry: a list entry representing a kmod module section + * + * Get the address of a kmod module section. + * + * After use, free the @list by calling kmod_module_section_free_list(). + * + * Returns: the address of this kmod module section on success or ULONG_MAX + * on failure. + */ +KMOD_EXPORT unsigned long kmod_module_section_get_address(const struct kmod_list *entry) +{ + struct kmod_module_section *section; + + if (entry == NULL) + return (unsigned long)-1; + + section = entry->data; + return section->address; +} + +/** + * kmod_module_section_free_list: + * @list: kmod module section list + * + * Release the resources taken by @list + */ +KMOD_EXPORT void kmod_module_section_free_list(struct kmod_list *list) +{ + while (list) { + kmod_module_section_free(list->data); + list = kmod_list_remove(list); + } +} + +static struct kmod_elf *kmod_module_get_elf(const struct kmod_module *mod) +{ + if (mod->file == NULL) { + const char *path = kmod_module_get_path(mod); + + if (path == NULL) { + errno = ENOENT; + return NULL; + } + + ((struct kmod_module *)mod)->file = kmod_file_open(mod->ctx, + path); + if (mod->file == NULL) + return NULL; + } + + return kmod_file_get_elf(mod->file); +} + +struct kmod_module_info { + char *key; + char value[]; +}; + +static struct kmod_module_info *kmod_module_info_new(const char *key, size_t keylen, const char *value, size_t valuelen) +{ + struct kmod_module_info *info; + + info = malloc(sizeof(struct kmod_module_info) + keylen + valuelen + 2); + if (info == NULL) + return NULL; + + info->key = (char *)info + sizeof(struct kmod_module_info) + + valuelen + 1; + memcpy(info->key, key, keylen); + info->key[keylen] = '\0'; + memcpy(info->value, value, valuelen); + info->value[valuelen] = '\0'; + return info; +} + +static void kmod_module_info_free(struct kmod_module_info *info) +{ + free(info); +} + +static struct kmod_list *kmod_module_info_append(struct kmod_list **list, const char *key, size_t keylen, const char *value, size_t valuelen) +{ + struct kmod_module_info *info; + struct kmod_list *n; + + info = kmod_module_info_new(key, keylen, value, valuelen); + if (info == NULL) + return NULL; + n = kmod_list_append(*list, info); + if (n != NULL) + *list = n; + else + kmod_module_info_free(info); + return n; +} + +static char *kmod_module_hex_to_str(const char *hex, size_t len) +{ + char *str; + int i; + int j; + const size_t line_limit = 20; + size_t str_len; + + str_len = len * 3; /* XX: or XX\0 */ + str_len += ((str_len + line_limit - 1) / line_limit - 1) * 3; /* \n\t\t */ + + str = malloc(str_len); + if (str == NULL) + return NULL; + + for (i = 0, j = 0; i < (int)len; i++) { + j += sprintf(str + j, "%02X", (unsigned char)hex[i]); + if (i < (int)len - 1) { + str[j++] = ':'; + + if ((i + 1) % line_limit == 0) + j += sprintf(str + j, "\n\t\t"); + } + } + return str; +} + +static struct kmod_list *kmod_module_info_append_hex(struct kmod_list **list, + const char *key, + size_t keylen, + const char *value, + size_t valuelen) +{ + char *hex; + struct kmod_list *n; + + if (valuelen > 0) { + /* Display as 01:12:DE:AD:BE:EF:... */ + hex = kmod_module_hex_to_str(value, valuelen); + if (hex == NULL) + goto list_error; + n = kmod_module_info_append(list, key, keylen, hex, strlen(hex)); + free(hex); + if (n == NULL) + goto list_error; + } else { + n = kmod_module_info_append(list, key, keylen, NULL, 0); + if (n == NULL) + goto list_error; + } + + return n; + +list_error: + return NULL; +} + +/** + * kmod_module_get_info: + * @mod: kmod module + * @list: where to return list of module information. Use + * kmod_module_info_get_key() and + * kmod_module_info_get_value(). Release this list with + * kmod_module_info_free_list() + * + * Get a list of entries in ELF section ".modinfo", these contain + * alias, license, depends, vermagic and other keys with respective + * values. If the module is signed (CONFIG_MODULE_SIG), information + * about the module signature is included as well: signer, + * sig_key and sig_hashalgo. + * + * After use, free the @list by calling kmod_module_info_free_list(). + * + * Returns: number of entries in @list on success or < 0 otherwise. + */ +KMOD_EXPORT int kmod_module_get_info(const struct kmod_module *mod, struct kmod_list **list) +{ + struct kmod_elf *elf; + char **strings; + int i, count, ret = -ENOMEM; + struct kmod_signature_info sig_info = {}; + + if (mod == NULL || list == NULL) + return -ENOENT; + + assert(*list == NULL); + + /* remove const: this can only change internal state */ + if (kmod_module_is_builtin((struct kmod_module *)mod)) { + count = kmod_builtin_get_modinfo(mod->ctx, + kmod_module_get_name(mod), + &strings); + if (count < 0) + return count; + } else { + elf = kmod_module_get_elf(mod); + if (elf == NULL) + return -errno; + + count = kmod_elf_get_strings(elf, ".modinfo", &strings); + if (count < 0) + return count; + } + + for (i = 0; i < count; i++) { + struct kmod_list *n; + const char *key, *value; + size_t keylen, valuelen; + + key = strings[i]; + value = strchr(key, '='); + if (value == NULL) { + keylen = strlen(key); + valuelen = 0; + value = key; + } else { + keylen = value - key; + value++; + valuelen = strlen(value); + } + + n = kmod_module_info_append(list, key, keylen, value, valuelen); + if (n == NULL) + goto list_error; + } + + if (mod->file && kmod_module_signature_info(mod->file, &sig_info)) { + struct kmod_list *n; + + n = kmod_module_info_append(list, "sig_id", strlen("sig_id"), + sig_info.id_type, strlen(sig_info.id_type)); + if (n == NULL) + goto list_error; + count++; + + n = kmod_module_info_append(list, "signer", strlen("signer"), + sig_info.signer, sig_info.signer_len); + if (n == NULL) + goto list_error; + count++; + + + n = kmod_module_info_append_hex(list, "sig_key", strlen("sig_key"), + sig_info.key_id, + sig_info.key_id_len); + if (n == NULL) + goto list_error; + count++; + + n = kmod_module_info_append(list, + "sig_hashalgo", strlen("sig_hashalgo"), + sig_info.hash_algo, strlen(sig_info.hash_algo)); + if (n == NULL) + goto list_error; + count++; + + /* + * Omit sig_info.algo for now, as these + * are currently constant. + */ + n = kmod_module_info_append_hex(list, "signature", + strlen("signature"), + sig_info.sig, + sig_info.sig_len); + + if (n == NULL) + goto list_error; + count++; + + } + ret = count; + +list_error: + /* aux structures freed in normal case also */ + kmod_module_signature_info_free(&sig_info); + + if (ret < 0) { + kmod_module_info_free_list(*list); + *list = NULL; + } + free(strings); + return ret; +} + +/** + * kmod_module_info_get_key: + * @entry: a list entry representing a kmod module info + * + * Get the key of a kmod module info. + * + * Returns: the key of this kmod module info on success or NULL on + * failure. The string is owned by the info, do not free it. + */ +KMOD_EXPORT const char *kmod_module_info_get_key(const struct kmod_list *entry) +{ + struct kmod_module_info *info; + + if (entry == NULL) + return NULL; + + info = entry->data; + return info->key; +} + +/** + * kmod_module_info_get_value: + * @entry: a list entry representing a kmod module info + * + * Get the value of a kmod module info. + * + * Returns: the value of this kmod module info on success or NULL on + * failure. The string is owned by the info, do not free it. + */ +KMOD_EXPORT const char *kmod_module_info_get_value(const struct kmod_list *entry) +{ + struct kmod_module_info *info; + + if (entry == NULL) + return NULL; + + info = entry->data; + return info->value; +} + +/** + * kmod_module_info_free_list: + * @list: kmod module info list + * + * Release the resources taken by @list + */ +KMOD_EXPORT void kmod_module_info_free_list(struct kmod_list *list) +{ + while (list) { + kmod_module_info_free(list->data); + list = kmod_list_remove(list); + } +} + +struct kmod_module_version { + uint64_t crc; + char symbol[]; +}; + +static struct kmod_module_version *kmod_module_versions_new(uint64_t crc, const char *symbol) +{ + struct kmod_module_version *mv; + size_t symbollen = strlen(symbol) + 1; + + mv = malloc(sizeof(struct kmod_module_version) + symbollen); + if (mv == NULL) + return NULL; + + mv->crc = crc; + memcpy(mv->symbol, symbol, symbollen); + return mv; +} + +static void kmod_module_version_free(struct kmod_module_version *version) +{ + free(version); +} + +/** + * kmod_module_get_versions: + * @mod: kmod module + * @list: where to return list of module versions. Use + * kmod_module_version_get_symbol() and + * kmod_module_version_get_crc(). Release this list with + * kmod_module_versions_free_list() + * + * Get a list of entries in ELF section "__versions". + * + * After use, free the @list by calling kmod_module_versions_free_list(). + * + * Returns: 0 on success or < 0 otherwise. + */ +KMOD_EXPORT int kmod_module_get_versions(const struct kmod_module *mod, struct kmod_list **list) +{ + struct kmod_elf *elf; + struct kmod_modversion *versions; + int i, count, ret = 0; + + if (mod == NULL || list == NULL) + return -ENOENT; + + assert(*list == NULL); + + elf = kmod_module_get_elf(mod); + if (elf == NULL) + return -errno; + + count = kmod_elf_get_modversions(elf, &versions); + if (count < 0) + return count; + + for (i = 0; i < count; i++) { + struct kmod_module_version *mv; + struct kmod_list *n; + + mv = kmod_module_versions_new(versions[i].crc, versions[i].symbol); + if (mv == NULL) { + ret = -errno; + kmod_module_versions_free_list(*list); + *list = NULL; + goto list_error; + } + + n = kmod_list_append(*list, mv); + if (n != NULL) + *list = n; + else { + kmod_module_version_free(mv); + kmod_module_versions_free_list(*list); + *list = NULL; + ret = -ENOMEM; + goto list_error; + } + } + ret = count; + +list_error: + free(versions); + return ret; +} + +/** + * kmod_module_version_get_symbol: + * @entry: a list entry representing a kmod module versions + * + * Get the symbol of a kmod module versions. + * + * Returns: the symbol of this kmod module versions on success or NULL + * on failure. The string is owned by the versions, do not free it. + */ +KMOD_EXPORT const char *kmod_module_version_get_symbol(const struct kmod_list *entry) +{ + struct kmod_module_version *version; + + if (entry == NULL || entry->data == NULL) + return NULL; + + version = entry->data; + return version->symbol; +} + +/** + * kmod_module_version_get_crc: + * @entry: a list entry representing a kmod module version + * + * Get the crc of a kmod module version. + * + * Returns: the crc of this kmod module version if available, otherwise default to 0. + */ +KMOD_EXPORT uint64_t kmod_module_version_get_crc(const struct kmod_list *entry) +{ + struct kmod_module_version *version; + + if (entry == NULL || entry->data == NULL) + return 0; + + version = entry->data; + return version->crc; +} + +/** + * kmod_module_versions_free_list: + * @list: kmod module versions list + * + * Release the resources taken by @list + */ +KMOD_EXPORT void kmod_module_versions_free_list(struct kmod_list *list) +{ + while (list) { + kmod_module_version_free(list->data); + list = kmod_list_remove(list); + } +} + +struct kmod_module_symbol { + uint64_t crc; + char symbol[]; +}; + +static struct kmod_module_symbol *kmod_module_symbols_new(uint64_t crc, const char *symbol) +{ + struct kmod_module_symbol *mv; + size_t symbollen = strlen(symbol) + 1; + + mv = malloc(sizeof(struct kmod_module_symbol) + symbollen); + if (mv == NULL) + return NULL; + + mv->crc = crc; + memcpy(mv->symbol, symbol, symbollen); + return mv; +} + +static void kmod_module_symbol_free(struct kmod_module_symbol *symbol) +{ + free(symbol); +} + +/** + * kmod_module_get_symbols: + * @mod: kmod module + * @list: where to return list of module symbols. Use + * kmod_module_symbol_get_symbol() and + * kmod_module_symbol_get_crc(). Release this list with + * kmod_module_symbols_free_list() + * + * Get a list of entries in ELF section ".symtab" or "__ksymtab_strings". + * + * After use, free the @list by calling kmod_module_symbols_free_list(). + * + * Returns: 0 on success or < 0 otherwise. + */ +KMOD_EXPORT int kmod_module_get_symbols(const struct kmod_module *mod, struct kmod_list **list) +{ + struct kmod_elf *elf; + struct kmod_modversion *symbols; + int i, count, ret = 0; + + if (mod == NULL || list == NULL) + return -ENOENT; + + assert(*list == NULL); + + elf = kmod_module_get_elf(mod); + if (elf == NULL) + return -errno; + + count = kmod_elf_get_symbols(elf, &symbols); + if (count < 0) + return count; + + for (i = 0; i < count; i++) { + struct kmod_module_symbol *mv; + struct kmod_list *n; + + mv = kmod_module_symbols_new(symbols[i].crc, symbols[i].symbol); + if (mv == NULL) { + ret = -errno; + kmod_module_symbols_free_list(*list); + *list = NULL; + goto list_error; + } + + n = kmod_list_append(*list, mv); + if (n != NULL) + *list = n; + else { + kmod_module_symbol_free(mv); + kmod_module_symbols_free_list(*list); + *list = NULL; + ret = -ENOMEM; + goto list_error; + } + } + ret = count; + +list_error: + free(symbols); + return ret; +} + +/** + * kmod_module_symbol_get_symbol: + * @entry: a list entry representing a kmod module symbols + * + * Get the symbol of a kmod module symbols. + * + * Returns: the symbol of this kmod module symbols on success or NULL + * on failure. The string is owned by the symbols, do not free it. + */ +KMOD_EXPORT const char *kmod_module_symbol_get_symbol(const struct kmod_list *entry) +{ + struct kmod_module_symbol *symbol; + + if (entry == NULL || entry->data == NULL) + return NULL; + + symbol = entry->data; + return symbol->symbol; +} + +/** + * kmod_module_symbol_get_crc: + * @entry: a list entry representing a kmod module symbol + * + * Get the crc of a kmod module symbol. + * + * Returns: the crc of this kmod module symbol if available, otherwise default to 0. + */ +KMOD_EXPORT uint64_t kmod_module_symbol_get_crc(const struct kmod_list *entry) +{ + struct kmod_module_symbol *symbol; + + if (entry == NULL || entry->data == NULL) + return 0; + + symbol = entry->data; + return symbol->crc; +} + +/** + * kmod_module_symbols_free_list: + * @list: kmod module symbols list + * + * Release the resources taken by @list + */ +KMOD_EXPORT void kmod_module_symbols_free_list(struct kmod_list *list) +{ + while (list) { + kmod_module_symbol_free(list->data); + list = kmod_list_remove(list); + } +} + +struct kmod_module_dependency_symbol { + uint64_t crc; + uint8_t bind; + char symbol[]; +}; + +static struct kmod_module_dependency_symbol *kmod_module_dependency_symbols_new(uint64_t crc, uint8_t bind, const char *symbol) +{ + struct kmod_module_dependency_symbol *mv; + size_t symbollen = strlen(symbol) + 1; + + mv = malloc(sizeof(struct kmod_module_dependency_symbol) + symbollen); + if (mv == NULL) + return NULL; + + mv->crc = crc; + mv->bind = bind; + memcpy(mv->symbol, symbol, symbollen); + return mv; +} + +static void kmod_module_dependency_symbol_free(struct kmod_module_dependency_symbol *dependency_symbol) +{ + free(dependency_symbol); +} + +/** + * kmod_module_get_dependency_symbols: + * @mod: kmod module + * @list: where to return list of module dependency_symbols. Use + * kmod_module_dependency_symbol_get_symbol() and + * kmod_module_dependency_symbol_get_crc(). Release this list with + * kmod_module_dependency_symbols_free_list() + * + * Get a list of entries in ELF section ".symtab" or "__ksymtab_strings". + * + * After use, free the @list by calling + * kmod_module_dependency_symbols_free_list(). + * + * Returns: 0 on success or < 0 otherwise. + */ +KMOD_EXPORT int kmod_module_get_dependency_symbols(const struct kmod_module *mod, struct kmod_list **list) +{ + struct kmod_elf *elf; + struct kmod_modversion *symbols; + int i, count, ret = 0; + + if (mod == NULL || list == NULL) + return -ENOENT; + + assert(*list == NULL); + + elf = kmod_module_get_elf(mod); + if (elf == NULL) + return -errno; + + count = kmod_elf_get_dependency_symbols(elf, &symbols); + if (count < 0) + return count; + + for (i = 0; i < count; i++) { + struct kmod_module_dependency_symbol *mv; + struct kmod_list *n; + + mv = kmod_module_dependency_symbols_new(symbols[i].crc, + symbols[i].bind, + symbols[i].symbol); + if (mv == NULL) { + ret = -errno; + kmod_module_dependency_symbols_free_list(*list); + *list = NULL; + goto list_error; + } + + n = kmod_list_append(*list, mv); + if (n != NULL) + *list = n; + else { + kmod_module_dependency_symbol_free(mv); + kmod_module_dependency_symbols_free_list(*list); + *list = NULL; + ret = -ENOMEM; + goto list_error; + } + } + ret = count; + +list_error: + free(symbols); + return ret; +} + +/** + * kmod_module_dependency_symbol_get_symbol: + * @entry: a list entry representing a kmod module dependency_symbols + * + * Get the dependency symbol of a kmod module + * + * Returns: the symbol of this kmod module dependency_symbols on success or NULL + * on failure. The string is owned by the dependency_symbols, do not free it. + */ +KMOD_EXPORT const char *kmod_module_dependency_symbol_get_symbol(const struct kmod_list *entry) +{ + struct kmod_module_dependency_symbol *dependency_symbol; + + if (entry == NULL || entry->data == NULL) + return NULL; + + dependency_symbol = entry->data; + return dependency_symbol->symbol; +} + +/** + * kmod_module_dependency_symbol_get_crc: + * @entry: a list entry representing a kmod module dependency_symbol + * + * Get the crc of a kmod module dependency_symbol. + * + * Returns: the crc of this kmod module dependency_symbol if available, otherwise default to 0. + */ +KMOD_EXPORT uint64_t kmod_module_dependency_symbol_get_crc(const struct kmod_list *entry) +{ + struct kmod_module_dependency_symbol *dependency_symbol; + + if (entry == NULL || entry->data == NULL) + return 0; + + dependency_symbol = entry->data; + return dependency_symbol->crc; +} + +/** + * kmod_module_dependency_symbol_get_bind: + * @entry: a list entry representing a kmod module dependency_symbol + * + * Get the bind type of a kmod module dependency_symbol. + * + * Returns: the bind of this kmod module dependency_symbol on success + * or < 0 on failure. + */ +KMOD_EXPORT int kmod_module_dependency_symbol_get_bind(const struct kmod_list *entry) +{ + struct kmod_module_dependency_symbol *dependency_symbol; + + if (entry == NULL || entry->data == NULL) + return 0; + + dependency_symbol = entry->data; + return dependency_symbol->bind; +} + +/** + * kmod_module_dependency_symbols_free_list: + * @list: kmod module dependency_symbols list + * + * Release the resources taken by @list + */ +KMOD_EXPORT void kmod_module_dependency_symbols_free_list(struct kmod_list *list) +{ + while (list) { + kmod_module_dependency_symbol_free(list->data); + list = kmod_list_remove(list); + } +} |