51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sched.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <fcntl.h>
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#include <linux/limits.h>
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int main(int argc, char * * argv)
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{
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if (argc < 3) {
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fprintf(stderr, "%s: missing arguments\n", argv[0]);
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return 1;
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}
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char nsPath[PATH_MAX];
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sprintf(nsPath, "/run/netns/%s", argv[1]);
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int fd = open(nsPath, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "%s: opening network namespace: %s\n", argv[0], strerror(errno));
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return 1;
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}
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if (setns(fd, CLONE_NEWNET) == -1) {
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fprintf(stderr, "%s: setting network namespace: %s\n", argv[0], strerror(errno));
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return 1;
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}
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umount2(nsPath, MNT_DETACH);
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if (unlink(nsPath) == -1) {
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fprintf(stderr, "%s: unlinking network namespace: %s\n", argv[0], strerror(errno));
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return 1;
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}
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/* FIXME: Remount /sys so that /sys/class/net reflects the
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interfaces visible in the network namespace. This requires
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bind-mounting /sys/fs/cgroups etc. */
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execv(argv[2], argv + 2);
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fprintf(stderr, "%s: running command: %s\n", argv[0], strerror(errno));
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return 1;
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}
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