| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | |
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| 3 | #include <arpa/inet.h> |
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| 4 | #include <error.h> |
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| 5 | #include <errno.h> |
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| 6 | #include <unistd.h> |
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| 7 | |
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| 8 | int main(void) |
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| 9 | { |
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| 10 | int fd1, fd2, one = 1; |
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| 11 | struct sockaddr_in6 bind_addr = { |
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| 12 | .sin6_family = AF_INET6, |
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| 13 | .sin6_port = htons(20000), |
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| 14 | .sin6_flowinfo = htonl(0), |
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| 15 | .sin6_addr = {}, |
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| 16 | .sin6_scope_id = 0, |
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| 17 | }; |
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| 18 | |
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| 19 | inet_pton(AF_INET6, "::" , &bind_addr.sin6_addr); |
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| 20 | |
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| 21 | fd1 = socket(AF_INET6, SOCK_STREAM, IPPROTO_IP); |
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| 22 | if (fd1 < 0) { |
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| 23 | error(1, errno, "socket fd1" ); |
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| 24 | return -1; |
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| 25 | } |
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| 26 | |
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| 27 | if (setsockopt(fd1, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) { |
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| 28 | error(1, errno, "setsockopt(SO_REUSEADDR) fd1" ); |
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| 29 | goto out_err1; |
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| 30 | } |
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| 31 | |
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| 32 | if (bind(fd1, (struct sockaddr *)&bind_addr, sizeof(bind_addr))) { |
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| 33 | error(1, errno, "bind fd1" ); |
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| 34 | goto out_err1; |
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| 35 | } |
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| 36 | |
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| 37 | if (listen(fd1, 0)) { |
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| 38 | error(1, errno, "listen" ); |
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| 39 | goto out_err1; |
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| 40 | } |
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| 41 | |
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| 42 | fd2 = socket(AF_INET6, SOCK_STREAM, IPPROTO_IP); |
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| 43 | if (fd2 < 0) { |
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| 44 | error(1, errno, "socket fd2" ); |
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| 45 | goto out_err1; |
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| 46 | } |
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| 47 | |
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| 48 | if (connect(fd2, (struct sockaddr *)&bind_addr, sizeof(bind_addr))) { |
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| 49 | error(1, errno, "bind fd2" ); |
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| 50 | goto out_err2; |
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| 51 | } |
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| 52 | |
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| 53 | close(fd2); |
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| 54 | close(fd1); |
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| 55 | return 0; |
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| 56 | |
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| 57 | out_err2: |
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| 58 | close(fd2); |
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| 59 | out_err1: |
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| 60 | close(fd1); |
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| 61 | return -1; |
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| 62 | } |
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| 63 | |
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