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- /*
- * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #define _GNU_SOURCE
- #include <sys/syscall.h>
- #include <sys/mman.h>
- #include <sys/utsname.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <sys/syscall.h>
- #include <sys/types.h>
- #include <values.h>
- #include <errno.h>
- #include <stdio.h>
- #include <string.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <libgen.h>
- #include <glob.h>
- #include <elf.h>
- #include <libubox/avl.h>
- #include <libubox/avl-cmp.h>
- #include <libubox/utils.h>
- #include <libubox/ulog.h>
- #define DEF_MOD_PATH "/modules/%s/"
- enum {
- SCANNED,
- PROBE,
- LOADED,
- };
- struct module {
- char *name;
- char *depends;
- char *opts;
- int size;
- int usage;
- int state;
- int error;
- int refcnt; /* number of references from module_node.m */
- };
- struct module_node {
- struct avl_node avl;
- struct module *m;
- bool is_alias;
- };
- static struct avl_tree modules;
- static char **module_folders = NULL;
- static void free_module(struct module *m);
- static int init_module_folders(void)
- {
- int n = 0;
- struct stat st;
- struct utsname ver;
- char *s, *e, *p, path[256], ldpath[256];
- e = ldpath;
- s = getenv("LD_LIBRARY_PATH");
- if (s)
- e += snprintf(ldpath, sizeof(ldpath), "%s:", s);
- e += snprintf(e, sizeof(ldpath) - (e - ldpath), "/lib");
- uname(&ver);
- for (s = p = ldpath; p <= e; p++) {
- if (*p != ':' && *p != '\0')
- continue;
- *p = 0;
- snprintf(path, sizeof(path), "%s" DEF_MOD_PATH, s, ver.release);
- if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
- module_folders = realloc(module_folders, sizeof(p) * (n + 2));
- if (!module_folders) {
- ULOG_ERR("out of memory\n");
- return -1;
- }
- module_folders[n++] = strdup(path);
- }
- s = p + 1;
- }
- if (!module_folders)
- return -1;
- module_folders[n] = NULL;
- return 0;
- }
- static struct module *find_module(const char *name)
- {
- struct module_node *mn;
- mn = avl_find_element(&modules, name, mn, avl);
- if (mn)
- return mn->m;
- else
- return NULL;
- }
- static void free_modules(void)
- {
- struct module_node *mn, *tmp;
- avl_remove_all_elements(&modules, mn, avl, tmp) {
- struct module *m = mn->m;
- m->refcnt -= 1;
- if (m->refcnt == 0)
- free_module(m);
- free(mn);
- }
- }
- static char* get_module_path(char *name)
- {
- char **p;
- static char path[256];
- struct stat s;
- if (!stat(name, &s) && S_ISREG(s.st_mode))
- return name;
- for (p = module_folders; *p; p++) {
- snprintf(path, sizeof(path), "%s%s.ko", *p, name);
- if (!stat(path, &s) && S_ISREG(s.st_mode))
- return path;
- }
- return NULL;
- }
- static char* get_module_name(char *path)
- {
- static char name[33];
- char *t;
- strncpy(name, basename(path), sizeof(name) - 1);
- t = strstr(name, ".ko");
- if (t)
- *t = '\0';
- return name;
- }
- static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
- {
- const char *secnames;
- Elf64_Ehdr *e;
- Elf64_Shdr *sh;
- int i;
- e = (Elf64_Ehdr *) map;
- sh = (Elf64_Shdr *) (map + e->e_shoff);
- secnames = map + sh[e->e_shstrndx].sh_offset;
- for (i = 0; i < e->e_shnum; i++) {
- if (!strcmp(section, secnames + sh[i].sh_name)) {
- *size = sh[i].sh_size;
- *offset = sh[i].sh_offset;
- return 0;
- }
- }
- return -1;
- }
- static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
- {
- const char *secnames;
- Elf32_Ehdr *e;
- Elf32_Shdr *sh;
- int i;
- e = (Elf32_Ehdr *) map;
- sh = (Elf32_Shdr *) (map + e->e_shoff);
- secnames = map + sh[e->e_shstrndx].sh_offset;
- for (i = 0; i < e->e_shnum; i++) {
- if (!strcmp(section, secnames + sh[i].sh_name)) {
- *size = sh[i].sh_size;
- *offset = sh[i].sh_offset;
- return 0;
- }
- }
- return -1;
- }
- static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
- {
- int clazz = map[EI_CLASS];
- int endian = map[EI_DATA];
- #if __BYTE_ORDER == __LITTLE_ENDIAN
- if (endian != ELFDATA2LSB)
- #elif __BYTE_ORDER == __BIG_ENDIAN
- if (endian != ELFDATA2MSB)
- #else
- #error "unsupported endian"
- #endif
- {
- ULOG_ERR("invalid endianess: %d\n", endian);
- return -1;
- }
- if (clazz == ELFCLASS32)
- return elf32_find_section(map, section, offset, size);
- else if (clazz == ELFCLASS64)
- return elf64_find_section(map, section, offset, size);
- ULOG_ERR("unknown elf format %d\n", clazz);
- return -1;
- }
- static struct module_node *
- alloc_module_node(const char *name, struct module *m, bool is_alias)
- {
- struct module_node *mn;
- char *_name;
- mn = calloc_a(sizeof(*mn),
- &_name, strlen(name) + 1);
- if (mn) {
- mn->avl.key = strcpy(_name, name);
- mn->m = m;
- mn->is_alias = is_alias;
- avl_insert(&modules, &mn->avl);
- m->refcnt += 1;
- }
- return mn;
- }
- static struct module *
- alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
- {
- struct module *m;
- char *_name, *_dep;
- int i;
- m = calloc_a(sizeof(*m),
- &_name, strlen(name) + 1,
- &_dep, depends ? strlen(depends) + 2 : 0);
- if (!m)
- return NULL;
- m->name = strcpy(_name, name);
- m->opts = 0;
- if (depends) {
- m->depends = strcpy(_dep, depends);
- while (*_dep) {
- if (*_dep == ',')
- *_dep = '\0';
- _dep++;
- }
- }
- m->size = size;
- m->refcnt = 0;
- alloc_module_node(m->name, m, false);
- for (i = 0; i < naliases; i++)
- alloc_module_node(aliases[i], m, true);
- return m;
- }
- static void free_module(struct module *m)
- {
- if (m->opts)
- free(m->opts);
- free(m);
- }
- static int scan_loaded_modules(void)
- {
- size_t buf_len = 0;
- char *buf = NULL;
- FILE *fp;
- fp = fopen("/proc/modules", "r");
- if (!fp) {
- ULOG_ERR("failed to open /proc/modules\n");
- return -1;
- }
- while (getline(&buf, &buf_len, fp) > 0) {
- struct module m;
- struct module *n;
- m.name = strtok(buf, " ");
- m.size = atoi(strtok(NULL, " "));
- m.usage = atoi(strtok(NULL, " "));
- m.depends = strtok(NULL, " ");
- if (!m.name || !m.depends)
- continue;
- n = find_module(m.name);
- if (!n) {
- /* possibly a module outside /lib/modules/<ver>/ */
- n = alloc_module(m.name, NULL, 0, m.depends, m.size);
- }
- n->usage = m.usage;
- n->state = LOADED;
- }
- free(buf);
- fclose(fp);
- return 0;
- }
- static struct module* get_module_info(const char *module, const char *name)
- {
- int fd = open(module, O_RDONLY);
- unsigned int offset, size;
- char *map = MAP_FAILED, *strings, *dep = NULL;
- const char **aliases = NULL;
- int naliases = 0;
- struct module *m = NULL;
- struct stat s;
- if (fd < 0) {
- ULOG_ERR("failed to open %s\n", module);
- goto out;
- }
- if (fstat(fd, &s) == -1) {
- ULOG_ERR("failed to stat %s\n", module);
- goto out;
- }
- map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (map == MAP_FAILED) {
- ULOG_ERR("failed to mmap %s\n", module);
- goto out;
- }
- if (elf_find_section(map, ".modinfo", &offset, &size)) {
- ULOG_ERR("failed to load the .modinfo section from %s\n", module);
- goto out;
- }
- strings = map + offset;
- while (true) {
- char *sep;
- int len;
- while (!strings[0])
- strings++;
- if (strings >= map + offset + size)
- break;
- sep = strstr(strings, "=");
- if (!sep)
- break;
- len = sep - strings;
- sep++;
- if (!strncmp(strings, "depends=", len + 1))
- dep = sep;
- else if (!strncmp(strings, "alias=", len + 1)) {
- aliases = realloc(aliases, sizeof(sep) * (naliases + 1));
- if (!aliases) {
- ULOG_ERR("out of memory\n");
- goto out;
- }
- aliases[naliases++] = sep;
- }
- strings = &sep[strlen(sep)];
- }
- m = alloc_module(name, aliases, naliases, dep, s.st_size);
- if (m)
- m->state = SCANNED;
- out:
- if (map != MAP_FAILED)
- munmap(map, s.st_size);
- if (fd >= 0)
- close(fd);
- free(aliases);
- return m;
- }
- static int scan_module_folder(const char *dir)
- {
- int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
- struct utsname ver;
- char *path;
- glob_t gl;
- int j, rv = 0;
- uname(&ver);
- path = alloca(strlen(dir) + sizeof("*.ko") + 1);
- sprintf(path, "%s*.ko", dir);
- if (glob(path, gl_flags, NULL, &gl) < 0)
- return -1;
- for (j = 0; j < gl.gl_pathc; j++) {
- char *name = get_module_name(gl.gl_pathv[j]);
- struct module *m;
- if (!name)
- continue;
- m = find_module(name);
- if (!m) {
- if (!get_module_info(gl.gl_pathv[j], name))
- rv |= -1;
- }
- }
- globfree(&gl);
- return rv;
- }
- static int scan_module_folders(void)
- {
- int rv = 0;
- char **p;
- if (init_module_folders())
- return -1;
- for (p = module_folders; *p; p++)
- rv |= scan_module_folder(*p);
- return rv;
- }
- static int print_modinfo(char *module)
- {
- int fd = open(module, O_RDONLY);
- unsigned int offset, size;
- struct stat s;
- char *map = MAP_FAILED, *strings;
- int rv = -1;
- if (fd < 0) {
- ULOG_ERR("failed to open %s\n", module);
- goto out;
- }
- if (fstat(fd, &s) == -1) {
- ULOG_ERR("failed to stat %s\n", module);
- goto out;
- }
- map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
- if (map == MAP_FAILED) {
- ULOG_ERR("failed to mmap %s\n", module);
- goto out;
- }
- if (elf_find_section(map, ".modinfo", &offset, &size)) {
- ULOG_ERR("failed to load the .modinfo section from %s\n", module);
- goto out;
- }
- strings = map + offset;
- printf("module:\t\t%s\n", module);
- while (true) {
- char *dup = NULL;
- char *sep;
- while (!strings[0])
- strings++;
- if (strings >= map + offset + size)
- break;
- sep = strstr(strings, "=");
- if (!sep)
- break;
- dup = strndup(strings, sep - strings);
- sep++;
- if (strncmp(strings, "parm", 4)) {
- if (strlen(dup) < 7)
- printf("%s:\t\t%s\n", dup, sep);
- else
- printf("%s:\t%s\n", dup, sep);
- }
- strings = &sep[strlen(sep)];
- if (dup)
- free(dup);
- }
- rv = 0;
- out:
- if (map != MAP_FAILED)
- munmap(map, s.st_size);
- if (fd >= 0)
- close(fd);
- return rv;
- }
- static int deps_available(struct module *m, int verbose)
- {
- char *dep;
- int err = 0;
- if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
- return 0;
- dep = m->depends;
- while (*dep) {
- m = find_module(dep);
- if (verbose && !m)
- ULOG_ERR("missing dependency %s\n", dep);
- if (verbose && m && (m->state != LOADED))
- ULOG_ERR("dependency not loaded %s\n", dep);
- if (!m || (m->state != LOADED))
- err++;
- dep += strlen(dep) + 1;
- }
- return err;
- }
- static int insert_module(char *path, const char *options)
- {
- void *data = 0;
- struct stat s;
- int fd, ret = -1;
- if (stat(path, &s)) {
- ULOG_ERR("missing module %s\n", path);
- return ret;
- }
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- ULOG_ERR("cannot open %s\n", path);
- return ret;
- }
- data = malloc(s.st_size);
- if (!data) {
- ULOG_ERR("out of memory\n");
- goto out;
- }
- if (read(fd, data, s.st_size) == s.st_size) {
- ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
- if (errno == EEXIST)
- ret = 0;
- }
- else
- ULOG_ERR("failed to read full module %s\n", path);
- out:
- close(fd);
- free(data);
- return ret;
- }
- static void load_moddeps(struct module *_m)
- {
- char *dep;
- struct module *m;
- if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
- return;
- dep = _m->depends;
- while (*dep) {
- m = find_module(dep);
- if (!m)
- ULOG_ERR("failed to find dependency %s\n", dep);
- if (m && (m->state != LOADED)) {
- m->state = PROBE;
- load_moddeps(m);
- }
- dep = dep + strlen(dep) + 1;
- }
- }
- static int iterations = 0;
- static int load_modprobe(void)
- {
- int loaded, todo;
- struct module_node *mn;
- struct module *m;
- avl_for_each_element(&modules, mn, avl) {
- if (mn->is_alias)
- continue;
- m = mn->m;
- if (m->state == PROBE)
- load_moddeps(m);
- }
- do {
- loaded = 0;
- todo = 0;
- avl_for_each_element(&modules, mn, avl) {
- if (mn->is_alias)
- continue;
- m = mn->m;
- if ((m->state == PROBE) && (!deps_available(m, 0))) {
- if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
- m->state = LOADED;
- m->error = 0;
- loaded++;
- continue;
- }
- m->error = 1;
- }
- if ((m->state == PROBE) || m->error)
- todo++;
- }
- iterations++;
- } while (loaded);
- return todo;
- }
- static int print_insmod_usage(void)
- {
- ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
- return -1;
- }
- static int print_modprobe_usage(void)
- {
- ULOG_INFO("Usage:\n\tmodprobe [-q] filename\n");
- return -1;
- }
- static int print_usage(char *arg)
- {
- ULOG_INFO("Usage:\n\t%s module\n", arg);
- return -1;
- }
- static int main_insmod(int argc, char **argv)
- {
- char *name, *cur, *options;
- int i, ret, len;
- if (argc < 2)
- return print_insmod_usage();
- name = get_module_name(argv[1]);
- if (!name) {
- ULOG_ERR("cannot find module - %s\n", argv[1]);
- return -1;
- }
- if (scan_loaded_modules())
- return -1;
- if (find_module(name)) {
- ULOG_ERR("module is already loaded - %s\n", name);
- return -1;
- }
- free_modules();
- for (len = 0, i = 2; i < argc; i++)
- len += strlen(argv[i]) + 1;
- options = malloc(len);
- if (!options) {
- ULOG_ERR("out of memory\n");
- ret = -1;
- goto err;
- }
- options[0] = 0;
- cur = options;
- for (i = 2; i < argc; i++) {
- if (options[0]) {
- *cur = ' ';
- cur++;
- }
- cur += sprintf(cur, "%s", argv[i]);
- }
- if (init_module_folders()) {
- fprintf(stderr, "Failed to find the folder holding the modules\n");
- ret = -1;
- goto err;
- }
- if (get_module_path(argv[1])) {
- name = argv[1];
- } else if (!get_module_path(name)) {
- fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
- ret = -1;
- goto err;
- }
- ret = insert_module(get_module_path(name), options);
- if (ret)
- ULOG_ERR("failed to insert %s\n", get_module_path(name));
- err:
- free(options);
- return ret;
- }
- static int main_rmmod(int argc, char **argv)
- {
- struct module *m;
- char *name;
- int ret;
- if (argc != 2)
- return print_usage("rmmod");
- if (scan_loaded_modules())
- return -1;
- name = get_module_name(argv[1]);
- m = find_module(name);
- if (!m) {
- ULOG_ERR("module is not loaded\n");
- return -1;
- }
- ret = syscall(__NR_delete_module, m->name, 0);
- if (ret)
- ULOG_ERR("unloading the module failed\n");
- free_modules();
- return ret;
- }
- static int main_lsmod(int argc, char **argv)
- {
- struct module_node *mn;
- struct module *m;
- char *dep;
- if (scan_loaded_modules())
- return -1;
- avl_for_each_element(&modules, mn, avl) {
- if (mn->is_alias)
- continue;
- m = mn->m;
- if (m->state == LOADED) {
- printf("%-20s%8d%3d ",
- m->name, m->size, m->usage);
- if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
- dep = m->depends;
- while (*dep) {
- printf("%s", dep);
- dep = dep + strlen(dep) + 1;
- if (*dep)
- printf(",");
- }
- }
- printf("\n");
- }
- }
- free_modules();
- return 0;
- }
- static int main_modinfo(int argc, char **argv)
- {
- struct module *m;
- char *name;
- if (argc != 2)
- return print_usage("modinfo");
- if (scan_module_folders())
- return -1;
- name = get_module_name(argv[1]);
- m = find_module(name);
- if (!m) {
- ULOG_ERR("cannot find module - %s\n", argv[1]);
- return -1;
- }
- name = get_module_path(m->name);
- if (!name) {
- ULOG_ERR("cannot find path of module - %s\n", m->name);
- return -1;
- }
- print_modinfo(name);
- return 0;
- }
- static int main_modprobe(int argc, char **argv)
- {
- struct module_node *mn;
- struct module *m;
- char *name;
- char *mod = NULL;
- int opt;
- bool quiet = false;
- while ((opt = getopt(argc, argv, "q")) != -1 ) {
- switch (opt) {
- case 'q': /* shhhh! */
- quiet = true;
- break;
- default: /* '?' */
- return print_modprobe_usage();
- break;
- }
- }
- if (optind >= argc)
- return print_modprobe_usage(); /* expected module after options */
- mod = argv[optind];
- if (scan_module_folders())
- return -1;
- if (scan_loaded_modules())
- return -1;
- name = get_module_name(mod);
- m = find_module(name);
- if (m && m->state == LOADED) {
- if (!quiet)
- ULOG_ERR("%s is already loaded\n", name);
- return 0;
- } else if (!m) {
- if (!quiet)
- ULOG_ERR("failed to find a module named %s\n", name);
- return -1;
- } else {
- int fail;
- m->state = PROBE;
- fail = load_modprobe();
- if (fail) {
- ULOG_ERR("%d module%s could not be probed\n",
- fail, (fail == 1) ? ("") : ("s"));
- avl_for_each_element(&modules, mn, avl) {
- if (mn->is_alias)
- continue;
- m = mn->m;
- if ((m->state == PROBE) || m->error)
- ULOG_ERR("- %s\n", m->name);
- }
- }
- }
- free_modules();
- return 0;
- }
- static int main_loader(int argc, char **argv)
- {
- int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
- char *dir = "/etc/modules.d/";
- struct module_node *mn;
- struct module *m;
- glob_t gl;
- char *path;
- int fail, j;
- if (argc > 1)
- dir = argv[1];
- path = malloc(strlen(dir) + 2);
- if (!path) {
- ULOG_ERR("out of memory\n");
- return -1;
- }
- strcpy(path, dir);
- strcat(path, "*");
- if (scan_module_folders()) {
- free (path);
- return -1;
- }
- if (scan_loaded_modules()) {
- free (path);
- return -1;
- }
- ULOG_INFO("loading kernel modules from %s\n", path);
- if (glob(path, gl_flags, NULL, &gl) < 0)
- goto out;
- for (j = 0; j < gl.gl_pathc; j++) {
- FILE *fp = fopen(gl.gl_pathv[j], "r");
- size_t mod_len = 0;
- char *mod = NULL;
- if (!fp) {
- ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
- continue;
- }
- while (getline(&mod, &mod_len, fp) > 0) {
- char *nl = strchr(mod, '\n');
- struct module *m;
- char *opts;
- if (nl)
- *nl = '\0';
- opts = strchr(mod, ' ');
- if (opts)
- *opts++ = '\0';
- m = find_module(get_module_name(mod));
- if (!m || (m->state == LOADED))
- continue;
- if (opts)
- m->opts = strdup(opts);
- m->state = PROBE;
- if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
- load_modprobe();
- }
- free(mod);
- fclose(fp);
- }
- fail = load_modprobe();
- if (fail) {
- ULOG_ERR("%d module%s could not be probed\n",
- fail, (fail == 1) ? ("") : ("s"));
- avl_for_each_element(&modules, mn, avl) {
- if (mn->is_alias)
- continue;
- m = mn->m;
- if ((m->state == PROBE) || (m->error))
- ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
- }
- } else {
- ULOG_INFO("done loading kernel modules from %s\n", path);
- }
- out:
- globfree(&gl);
- free(path);
- return 0;
- }
- static inline char weight(char c)
- {
- return c == '_' ? '-' : c;
- }
- static int avl_modcmp(const void *k1, const void *k2, void *ptr)
- {
- const char *s1 = k1;
- const char *s2 = k2;
- while (*s1 && (weight(*s1) == weight(*s2)))
- {
- s1++;
- s2++;
- }
- return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
- }
- int main(int argc, char **argv)
- {
- char *exec = basename(*argv);
- avl_init(&modules, avl_modcmp, false, NULL);
- if (!strcmp(exec, "insmod"))
- return main_insmod(argc, argv);
- if (!strcmp(exec, "rmmod"))
- return main_rmmod(argc, argv);
- if (!strcmp(exec, "lsmod"))
- return main_lsmod(argc, argv);
- if (!strcmp(exec, "modinfo"))
- return main_modinfo(argc, argv);
- if (!strcmp(exec, "modprobe"))
- return main_modprobe(argc, argv);
- ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
- return main_loader(argc, argv);
- }
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