62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <sched.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifndef SO_NETNS_COOKIE
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#define SO_NETNS_COOKIE 71
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#endif
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#define pr_err(fmt, ...) \
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({ \
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fprintf(stderr, "%s:%d:" fmt ": %m\n", \
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__func__, __LINE__, ##__VA_ARGS__); \
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1; \
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})
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int main(int argc, char *argvp[])
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{
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uint64_t cookie1, cookie2;
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socklen_t vallen;
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int sock1, sock2;
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sock1 = socket(AF_INET, SOCK_STREAM, 0);
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if (sock1 < 0)
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return pr_err("Unable to create TCP socket");
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vallen = sizeof(cookie1);
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if (getsockopt(sock1, SOL_SOCKET, SO_NETNS_COOKIE, &cookie1, &vallen) != 0)
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return pr_err("getsockopt(SOL_SOCKET, SO_NETNS_COOKIE)");
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if (!cookie1)
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return pr_err("SO_NETNS_COOKIE returned zero cookie");
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if (unshare(CLONE_NEWNET))
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return pr_err("unshare");
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sock2 = socket(AF_INET, SOCK_STREAM, 0);
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if (sock2 < 0)
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return pr_err("Unable to create TCP socket");
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vallen = sizeof(cookie2);
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if (getsockopt(sock2, SOL_SOCKET, SO_NETNS_COOKIE, &cookie2, &vallen) != 0)
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return pr_err("getsockopt(SOL_SOCKET, SO_NETNS_COOKIE)");
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if (!cookie2)
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return pr_err("SO_NETNS_COOKIE returned zero cookie");
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if (cookie1 == cookie2)
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return pr_err("SO_NETNS_COOKIE returned identical cookies for distinct ns");
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close(sock1);
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close(sock2);
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return 0;
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}
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