1 /* insmod.c - Load a module into the Linux kernel.
2 *
3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
4
5 USE_INSMOD(NEWTOY(insmod, "<1", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
6
7 config INSMOD
8 bool "insmod"
9 default y
10 help
11 usage: insmod MODULE [MODULE_OPTIONS]
12
13 Load the module named MODULE passing options if given.
14 */
15
16 #include "toys.h"
17
18 #include <sys/syscall.h>
19 #define finit_module(fd, opts, flags) syscall(SYS_finit_module, fd, opts, flags)
20 #define init_module(mod, len, opts) syscall(SYS_init_module, mod, len, opts)
21
insmod_main(void)22 void insmod_main(void)
23 {
24 int fd = !strcmp(*toys.optargs, "-") ? 0 : xopen(*toys.optargs, O_RDONLY);
25 int i, rc;
26
27 i = 1;
28 while (toys.optargs[i] &&
29 strlen(toybuf) + strlen(toys.optargs[i]) + 2 < sizeof(toybuf))
30 {
31 strcat(toybuf, toys.optargs[i++]);
32 strcat(toybuf, " ");
33 }
34
35 // finit_module was new in Linux 3.8, and doesn't work on stdin,
36 // so we fall back to init_module if necessary.
37 rc = finit_module(fd, toybuf, 0);
38 if (rc && (fd == 0 || errno == ENOSYS)) {
39 off_t len = 0;
40 char *path = !strcmp(*toys.optargs, "-") ? "/dev/stdin" : *toys.optargs;
41 char *buf = readfileat(AT_FDCWD, path, NULL, &len);
42
43 rc = init_module(buf, len, toybuf);
44 if (CFG_TOYBOX_FREE) free(buf);
45 }
46
47 if (rc) perror_exit("failed to load %s", toys.optargs[0]);
48
49 if (CFG_TOYBOX_FREE) close(fd);
50 }
51