63 lines · c
1// SPDX-License-Identifier: GPL-2.02 3#include <arpa/inet.h>4#include <error.h>5#include <errno.h>6#include <unistd.h>7 8int main(void)9{10 int fd1, fd2, one = 1;11 struct sockaddr_in6 bind_addr = {12 .sin6_family = AF_INET6,13 .sin6_port = htons(20000),14 .sin6_flowinfo = htonl(0),15 .sin6_addr = {},16 .sin6_scope_id = 0,17 };18 19 inet_pton(AF_INET6, "::", &bind_addr.sin6_addr);20 21 fd1 = socket(AF_INET6, SOCK_STREAM, IPPROTO_IP);22 if (fd1 < 0) {23 error(1, errno, "socket fd1");24 return -1;25 }26 27 if (setsockopt(fd1, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) {28 error(1, errno, "setsockopt(SO_REUSEADDR) fd1");29 goto out_err1;30 }31 32 if (bind(fd1, (struct sockaddr *)&bind_addr, sizeof(bind_addr))) {33 error(1, errno, "bind fd1");34 goto out_err1;35 }36 37 if (listen(fd1, 0)) {38 error(1, errno, "listen");39 goto out_err1;40 }41 42 fd2 = socket(AF_INET6, SOCK_STREAM, IPPROTO_IP);43 if (fd2 < 0) {44 error(1, errno, "socket fd2");45 goto out_err1;46 }47 48 if (connect(fd2, (struct sockaddr *)&bind_addr, sizeof(bind_addr))) {49 error(1, errno, "bind fd2");50 goto out_err2;51 }52 53 close(fd2);54 close(fd1);55 return 0;56 57out_err2:58 close(fd2);59out_err1:60 close(fd1);61 return -1;62}63