58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <linux/dm-ioctl.h>
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#include <stdlib.h>
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#define DM_CRYPT_BUF_SIZE 4096
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static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags)
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{
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memset(io, 0, dataSize);
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io->data_size = dataSize;
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io->data_start = sizeof(struct dm_ioctl);
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io->version[0] = 4;
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io->version[1] = 0;
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io->version[2] = 0;
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io->flags = flags;
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if (name) {
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strncpy(io->name, name, sizeof(io->name));
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}
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}
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int main(int argc, char *argv[])
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{
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char buffer[DM_CRYPT_BUF_SIZE];
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struct dm_ioctl *io;
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struct dm_target_versions *v;
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int i;
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int fd;
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fd = open("/dev/device-mapper", O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "Cannot open /dev/device-mapper\n");
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exit(1);
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}
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io = (struct dm_ioctl *) buffer;
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ioctl_init(io, DM_CRYPT_BUF_SIZE, NULL, 0);
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if (ioctl(fd, DM_LIST_VERSIONS, io)) {
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fprintf(stderr, "ioctl(DM_LIST_VERSIONS) returned an error\n");
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exit(1);
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}
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/* Iterate over the returned versions, and print each subsystem's version */
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v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)];
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while (v->next) {
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printf("%s: %d.%d.%d\n", v->name, v->version[0], v->version[1], v->version[2]);
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v = (struct dm_target_versions *)(((char *)v) + v->next);
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}
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close(fd);
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exit(0);
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}
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