#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/stat.h>
#include <fcntl.h>
#include <syslog.h>
+#include <libgen.h>
#include <glob.h>
-#include <sys/utsname.h>
+#include <elf.h>
+
+#include <libubox/avl.h>
+#include <libubox/avl-cmp.h>
+#include <libubox/utils.h>
+
+#define DEF_MOD_PATH "/lib/modules/%s/"
+
+#define LOG(fmt, ...) do { \
+ syslog(LOG_INFO, fmt, ## __VA_ARGS__); \
+ printf("kmod: "fmt, ## __VA_ARGS__); \
+ } while (0)
+
+
+enum {
+ SCANNED,
+ PROBE,
+ LOADED,
+};
+
+struct module {
+ struct avl_node avl;
+
+ char *name;
+ char *depends;
+
+ int size;
+ int usage;
+ int state;
+ int error;
+};
+
+static struct avl_tree modules;
+static char *prefix = "";
+
+static struct module *find_module(const char *name)
+{
+ struct module *m;
+ return avl_find_element(&modules, name, m, avl);
+}
+
+static void free_modules(void)
+{
+ struct module *m, *tmp;
-#define DEF_MOD_PATH "/lib/modules/%s/%s.ko"
-static int insmod(char *module, const char *options)
+ avl_remove_all_elements(&modules, m, avl, tmp)
+ free(m);
+}
+
+static char* get_module_path(char *name)
{
+ static char path[256];
struct utsname ver;
- char path[256];
- void *data = 0;
struct stat s;
- int fd, ret = -1;
+
+ if (!stat(name, &s))
+ return name;
+
+ uname(&ver);
+ snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
+
+ if (!stat(path, &s))
+ return path;
+
+ return NULL;
+}
+
+static char* get_module_name(char *path)
+{
+ static char name[32];
+ char *t;
+
+ strncpy(name, basename(path), sizeof(name));
+
+ t = strstr(name, ".ko");
+ if (t)
+ *t = '\0';
+
+ return name;
+}
+
+#if __WORDSIZE == 64
+static int elf_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;
+}
+#else
+static int elf_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;
+}
+#endif
+
+static struct module *
+alloc_module(const char *name, const char *depends, int size)
+{
+ struct module *m;
+ char *_name, *_dep;
+
+ m = calloc_a(sizeof(*m),
+ &_name, strlen(name) + 1,
+ &_dep, depends ? strlen(depends) + 2 : 0);
+ if (!m)
+ return NULL;
+
+ m->avl.key = m->name = strcpy(_name, name);
+
+ if (depends) {
+ m->depends = strcpy(_dep, depends);
+ while (*_dep) {
+ if (*_dep == ',')
+ *_dep = '\0';
+ _dep++;
+ }
+ }
+
+ m->size = size;
+ avl_insert(&modules, &m->avl);
+
+ return m;
+}
+
+static int scan_loaded_modules(void)
+{
+ size_t buf_len = 0;
+ char *buf = NULL;
+ FILE *fp;
+
+ fp = fopen("/proc/modules", "r");
+ if (!fp) {
+ LOG("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 = alloc_module(m.name, 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, *strings, *dep = NULL;
+ struct module *m;
+ struct stat s;
+
+ if (!fd) {
+ LOG("failed to open %s\n", module);
+ return NULL;
+ }
+
+ if (fstat(fd, &s) == -1) {
+ LOG("failed to stat %s\n", module);
+ return NULL;
+ }
+
+ map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (map == MAP_FAILED) {
+ LOG("failed to mmap %s\n", module);
+ return NULL;
+ }
+
+ if (elf_find_section(map, ".modinfo", &offset, &size)) {
+ LOG("failed to load the .modinfo section from %s\n", module);
+ return NULL;
+ }
+
+ strings = map + offset;
+ while (strings && (strings < map + offset + size)) {
+ char *sep;
+ int len;
+
+ while (!strings[0])
+ strings++;
+ sep = strstr(strings, "=");
+ if (!sep)
+ break;
+ len = sep - strings;
+ sep++;
+ if (!strncmp(strings, "depends=", len + 1))
+ dep = sep;
+ strings = &sep[strlen(sep)];
+ }
+
+ m = alloc_module(name, dep, s.st_size);
+ if (!m)
+ return NULL;
+
+ m->state = SCANNED;
+
+ return m;
+}
+
+static int scan_module_folder(void)
+{
+ int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
+ struct utsname ver;
+ char *path;
+ glob_t gl;
+ int j;
uname(&ver);
- snprintf(path, 256, DEF_MOD_PATH, ver.release, module);
+ path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(prefix) + strlen(ver.release) + 1);
+ sprintf(path, "%s" DEF_MOD_PATH "*.ko", prefix, ver.release);
+
+ 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)
+ get_module_info(gl.gl_pathv[j], name);
+ }
+
+ globfree(&gl);
+
+ return 0;
+}
+
+static int print_modinfo(char *module)
+{
+ int fd = open(module, O_RDONLY);
+ unsigned int offset, size;
+ struct stat s;
+ char *map, *strings;
+
+ if (!fd) {
+ LOG("failed to open %s\n", module);
+ return -1;
+ }
+
+ if (fstat(fd, &s) == -1) {
+ LOG("failed to stat %s\n", module);
+ return -1;
+ }
+
+ map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (map == MAP_FAILED) {
+ LOG("failed to mmap %s\n", module);
+ return -1;
+ }
+
+ if (elf_find_section(map, ".modinfo", &offset, &size)) {
+ LOG("failed to load the .modinfo section from %s\n", module);
+ return -1;
+ }
+
+ strings = map + offset;
+ printf("module:\t\t%s\n", module);
+ while (strings && (strings < map + offset + size)) {
+ char *dup = NULL;
+ char *sep;
+
+ while (!strings[0])
+ strings++;
+ 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);
+ }
+
+ return 0;
+}
+
+static int deps_available(struct module *m, int verbose)
+{
+ char *dep;
+ int err = 0;
+
+ if (!strcmp(m->depends, "-") || !strcmp(m->depends, ""))
+ return 0;
+
+ dep = m->depends;
+
+ while (*dep) {
+ m = find_module(dep);
+
+ if (verbose && !m)
+ LOG("missing dependency %s\n", dep);
+ if (verbose && m && (m->state != LOADED))
+ LOG("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)) {
- fprintf(stderr, "missing module %s\n", path);
+ LOG("missing module %s\n", path);
return ret;
}
fd = open(path, O_RDONLY);
if (!fd) {
- fprintf(stderr, "cannot open %s\n", path);
+ LOG("cannot open %s\n", path);
return ret;
}
data = malloc(s.st_size);
- if (read(fd, data, s.st_size) == s.st_size) {
+ if (read(fd, data, s.st_size) == s.st_size)
ret = syscall(__NR_init_module, data, s.st_size, options);
- if (ret)
- fprintf(stderr, "failed insert %s\n", module);
- } else {
- fprintf(stderr, "failed to read full module %s\n", path);
- }
+ else
+ LOG("failed to read full module %s\n", path);
close(fd);
free(data);
return ret;
}
-/*static void rmmod(char *module)
+static void load_moddeps(struct module *_m)
{
- syscall(__NR_delete_module, module, 0);
-}*/
+ char *dep;
+ struct module *m;
-int main(int argc, char **argv)
+ if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
+ return;
+
+ dep = _m->depends;
+
+ while (*dep) {
+ m = find_module(dep);
+
+ if (!m)
+ LOG("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 *m;
+
+ avl_for_each_element(&modules, m, avl)
+ if (m->state == PROBE)
+ load_moddeps(m);
+
+ do {
+ loaded = 0;
+ todo = 0;
+ avl_for_each_element(&modules, m, avl) {
+ if ((m->state == PROBE) && (!deps_available(m, 0))) {
+ if (!insert_module(get_module_path(m->name), "")) {
+ 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)
+{
+ LOG("Usage:\n\tinsmod filename [args]\n");
+
+ return -1;
+}
+
+static int print_usage(char *arg)
+{
+ LOG("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) {
+ LOG("cannot find module - %s\n", argv[1]);
+ return -1;
+ }
+
+ if (scan_loaded_modules())
+ return -1;
+
+ if (find_module(name)) {
+ LOG("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);
+ options[0] = 0;
+ cur = options;
+ for (i = 2; i < argc; i++) {
+ if (options[0]) {
+ *cur = ' ';
+ cur++;
+ }
+ cur += sprintf(cur, "%s", argv[i]);
+ }
+
+ ret = insert_module(get_module_path(name), options);
+ free(options);
+
+ if (ret)
+ LOG("failed to insert %s\n", get_module_path(name));
+
+ 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) {
+ LOG("module is not loaded\n");
+ return -1;
+ }
+ ret = syscall(__NR_delete_module, m->name, 0);
+
+ if (ret)
+ LOG("unloading the module failed\n");
+
+ free_modules();
+
+ return ret;
+}
+
+static int main_lsmod(int argc, char **argv)
+{
+ struct module *m;
+
+ if (scan_loaded_modules())
+ return -1;
+
+ avl_for_each_element(&modules, m, avl)
+ if (m->state == LOADED)
+ printf("%-20s%8d%3d %s\n",
+ m->name, m->size, m->usage,
+ (*m->depends == '-') ? ("") : (m->depends));
+
+ 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_folder())
+ return -1;
+
+ name = get_module_name(argv[1]);
+ m = find_module(name);
+ if (!m) {
+ LOG("cannot find module - %s\n", argv[1]);
+ return -1;
+ }
+
+ name = get_module_path(m->name);
+ if (!name) {
+ LOG("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 *m;
+ char *name;
+
+ if (argc != 2)
+ return print_usage("modprobe");
+
+ if (scan_loaded_modules())
+ return -1;
+
+ if (scan_module_folder())
+ return -1;
+
+ name = get_module_name(argv[1]);
+ m = find_module(name);
+ if (m && m->state == LOADED) {
+ LOG("%s is already loaded\n", name);
+ return -1;
+ } else if (!m) {
+ LOG("failed to find a module named %s\n", name);
+ } else {
+ int fail;
+
+ m->state = PROBE;
+
+ fail = load_modprobe();
+
+ if (fail) {
+ LOG("%d module%s could not be probed\n",
+ fail, (fail == 1) ? ("") : ("s"));
+
+ avl_for_each_element(&modules, m, avl)
+ if ((m->state == PROBE) || m->error)
+ LOG("- %s\n", m->name);
+ }
+ }
+
+ free_modules();
+
+ return 0;
+}
+
+static int main_loader(int argc, char **argv)
{
- glob_t gl;
int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
- char *tmp = malloc(256);
char *dir = "/etc/modules.d/*";
+ struct module *m;
+ glob_t gl;
+ char *path;
+ int fail, j;
if (argc > 1)
dir = argv[1];
- syslog(0, "kmodloader: loading kernel modules from %s\n", dir);
+ if (argc > 2)
+ prefix = argv[2];
- if (glob(dir, gl_flags, NULL, &gl) >= 0) {
- int j;
+ path = malloc(strlen(dir) + 2);
+ strcpy(path, dir);
+ strcat(path, "*");
- for (j = 0; j < gl.gl_pathc; j++) {
- FILE *fp = fopen(gl.gl_pathv[j], "r");
+ if (scan_loaded_modules())
+ return -1;
- if (!fp) {
- fprintf(stderr, "failed to open %s\n", gl.gl_pathv[j]);
- } else {
- char mod[64];
+ if (scan_module_folder())
+ return -1;
- while (fgets(mod, 64, fp)) {
- mod[strlen(mod) - 1] = '\0';
- insmod(mod, "");
- }
- fclose(fp);
- }
+ syslog(0, "kmodloader: 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) {
+ LOG("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;
+
+ m->state = PROBE;
+ if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
+ load_modprobe();
+
+ }
+ free(mod);
+ fclose(fp);
+ }
+
+ fail = load_modprobe();
+ LOG("ran %d iterations\n", iterations);
+
+ if (fail) {
+ LOG("%d module%s could not be probed\n",
+ fail, (fail == 1) ? ("") : ("s"));
+
+ avl_for_each_element(&modules, m, avl)
+ if ((m->state == PROBE) || (m->error))
+ LOG("- %s - %d\n", m->name, deps_available(m, 1));
}
+out:
globfree(&gl);
- free(tmp);
+ free(path);
return 0;
}
+
+static int avl_modcmp(const void *k1, const void *k2, void *ptr)
+{
+ const char *s1 = k1;
+ const char *s2 = k2;
+
+ while (*s1 && ((*s1 == *s2) ||
+ ((*s1 == '_') && (*s2 == '-')) ||
+ ((*s1 == '-') && (*s2 == '_'))))
+ {
+ s1++;
+ s2++;
+ }
+
+ return *(const unsigned char *)s1 - *(const unsigned char *)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);
+
+ return main_loader(argc, argv);
+}
projects / project / ubox.git / blobdiff