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/* insmod.c - Load a module into the Linux kernel.
*
* Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
USE_INSMOD(NEWTOY(insmod, "<1", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
config INSMOD
bool "insmod"
default y
help
usage: insmod MODULE [MODULE_OPTIONS]
Load the module named MODULE passing options if given.
*/
#include "toys.h"
#include <sys/syscall.h>
#ifdef SYS_finit_module
#define finit_module(fd, opts, flags) syscall(SYS_finit_module, fd, opts, flags)
#else
#define finit_module(a, b, c) (errno = ENOSYS)
#endif
#define init_module(mod, len, opts) syscall(SYS_init_module, mod, len, opts)
void insmod_main(void)
{
int fd = !strcmp(*toys.optargs, "-") ? 0 : xopen(*toys.optargs, O_RDONLY);
int i, rc;
i = 1;
while (toys.optargs[i] &&
strlen(toybuf) + strlen(toys.optargs[i]) + 2 < sizeof(toybuf))
{
strcat(toybuf, toys.optargs[i++]);
strcat(toybuf, " ");
}
// finit_module was new in Linux 3.8, and doesn't work on stdin,
// so we fall back to init_module if necessary.
rc = finit_module(fd, toybuf, 0);
if (rc && (fd == 0 || errno == ENOSYS)) {
off_t len = 0;
char *path = !strcmp(*toys.optargs, "-") ? "/dev/stdin" : *toys.optargs;
char *buf = readfileat(AT_FDCWD, path, NULL, &len);
rc = init_module(buf, len, toybuf);
if (CFG_TOYBOX_FREE) free(buf);
}
if (rc) perror_exit("failed to load %s", toys.optargs[0]);
if (CFG_TOYBOX_FREE) close(fd);
}
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