--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+
+/* Test that sockets listening on a specific address are preferred
+ * over sockets listening on addr_any.
+ */
+
+#define _GNU_SOURCE
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <error.h>
+#include <linux/in.h>
+#include <linux/unistd.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/epoll.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+static const char *IP4_ADDR = "127.0.0.1";
+static const char *IP6_ADDR = "::1";
+static const char *IP4_MAPPED6 = "::ffff:127.0.0.1";
+
+static const int PORT = 8888;
+
+static void build_rcv_fd(int family, int proto, int *rcv_fds, int count,
+ const char *addr_str)
+{
+ struct sockaddr_in addr4 = {0};
+ struct sockaddr_in6 addr6 = {0};
+ struct sockaddr *addr;
+ int opt, i, sz;
+
+ memset(&addr, 0, sizeof(addr));
+
+ switch (family) {
+ case AF_INET:
+ addr4.sin_family = family;
+ if (!addr_str)
+ addr4.sin_addr.s_addr = htonl(INADDR_ANY);
+ else if (!inet_pton(family, addr_str, &addr4.sin_addr.s_addr))
+ error(1, errno, "inet_pton failed: %s", addr_str);
+ addr4.sin_port = htons(PORT);
+ sz = sizeof(addr4);
+ addr = (struct sockaddr *)&addr4;
+ break;
+ case AF_INET6:
+ addr6.sin6_family = AF_INET6;
+ if (!addr_str)
+ addr6.sin6_addr = in6addr_any;
+ else if (!inet_pton(family, addr_str, &addr6.sin6_addr))
+ error(1, errno, "inet_pton failed: %s", addr_str);
+ addr6.sin6_port = htons(PORT);
+ sz = sizeof(addr6);
+ addr = (struct sockaddr *)&addr6;
+ break;
+ default:
+ error(1, 0, "Unsupported family %d", family);
+ }
+
+ for (i = 0; i < count; ++i) {
+ rcv_fds[i] = socket(family, proto, 0);
+ if (rcv_fds[i] < 0)
+ error(1, errno, "failed to create receive socket");
+
+ opt = 1;
+ if (setsockopt(rcv_fds[i], SOL_SOCKET, SO_REUSEPORT, &opt,
+ sizeof(opt)))
+ error(1, errno, "failed to set SO_REUSEPORT");
+
+ if (bind(rcv_fds[i], addr, sz))
+ error(1, errno, "failed to bind receive socket");
+
+ if (proto == SOCK_STREAM && listen(rcv_fds[i], 10))
+ error(1, errno, "failed to listen on receive port");
+ }
+}
+
+static int connect_and_send(int family, int proto)
+{
+ struct sockaddr_in saddr4 = {0};
+ struct sockaddr_in daddr4 = {0};
+ struct sockaddr_in6 saddr6 = {0};
+ struct sockaddr_in6 daddr6 = {0};
+ struct sockaddr *saddr, *daddr;
+ int fd, sz;
+
+ switch (family) {
+ case AF_INET:
+ saddr4.sin_family = AF_INET;
+ saddr4.sin_addr.s_addr = htonl(INADDR_ANY);
+ saddr4.sin_port = 0;
+
+ daddr4.sin_family = AF_INET;
+ if (!inet_pton(family, IP4_ADDR, &daddr4.sin_addr.s_addr))
+ error(1, errno, "inet_pton failed: %s", IP4_ADDR);
+ daddr4.sin_port = htons(PORT);
+
+ sz = sizeof(saddr4);
+ saddr = (struct sockaddr *)&saddr4;
+ daddr = (struct sockaddr *)&daddr4;
+ break;
+ case AF_INET6:
+ saddr6.sin6_family = AF_INET6;
+ saddr6.sin6_addr = in6addr_any;
+
+ daddr6.sin6_family = AF_INET6;
+ if (!inet_pton(family, IP6_ADDR, &daddr6.sin6_addr))
+ error(1, errno, "inet_pton failed: %s", IP6_ADDR);
+ daddr6.sin6_port = htons(PORT);
+
+ sz = sizeof(saddr6);
+ saddr = (struct sockaddr *)&saddr6;
+ daddr = (struct sockaddr *)&daddr6;
+ break;
+ default:
+ error(1, 0, "Unsupported family %d", family);
+ }
+
+ fd = socket(family, proto, 0);
+ if (fd < 0)
+ error(1, errno, "failed to create send socket");
+
+ if (bind(fd, saddr, sz))
+ error(1, errno, "failed to bind send socket");
+
+ if (connect(fd, daddr, sz))
+ error(1, errno, "failed to connect send socket");
+
+ if (send(fd, "a", 1, 0) < 0)
+ error(1, errno, "failed to send message");
+
+ return fd;
+}
+
+static int receive_once(int epfd, int proto)
+{
+ struct epoll_event ev;
+ int i, fd;
+ char buf[8];
+
+ i = epoll_wait(epfd, &ev, 1, 3);
+ if (i < 0)
+ error(1, errno, "epoll_wait failed");
+
+ if (proto == SOCK_STREAM) {
+ fd = accept(ev.data.fd, NULL, NULL);
+ if (fd < 0)
+ error(1, errno, "failed to accept");
+ i = recv(fd, buf, sizeof(buf), 0);
+ close(fd);
+ } else {
+ i = recv(ev.data.fd, buf, sizeof(buf), 0);
+ }
+
+ if (i < 0)
+ error(1, errno, "failed to recv");
+
+ return ev.data.fd;
+}
+
+static void test(int *rcv_fds, int count, int family, int proto, int fd)
+{
+ struct epoll_event ev;
+ int epfd, i, send_fd, recv_fd;
+
+ epfd = epoll_create(1);
+ if (epfd < 0)
+ error(1, errno, "failed to create epoll");
+
+ ev.events = EPOLLIN;
+ for (i = 0; i < count; ++i) {
+ ev.data.fd = rcv_fds[i];
+ if (epoll_ctl(epfd, EPOLL_CTL_ADD, rcv_fds[i], &ev))
+ error(1, errno, "failed to register sock epoll");
+ }
+
+ send_fd = connect_and_send(family, proto);
+
+ recv_fd = receive_once(epfd, proto);
+ if (recv_fd != fd)
+ error(1, 0, "received on an unexpected socket");
+
+ close(send_fd);
+ close(epfd);
+}
+
+int main(void)
+{
+ /* Below we test that a socket listening on a specific address
+ * is always selected in preference over a socket listening
+ * on addr_any. Bugs where this is not the case often result
+ * in sockets created first or last to get picked. So below
+ * we make sure that there are always addr_any sockets created
+ * before and after a specific socket is created.
+ */
+ int rcv_fds[10], i;
+
+ fprintf(stderr, "---- UDP IPv4 ----\n");
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL);
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 4, 1, IP4_ADDR);
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL);
+ test(rcv_fds, 9, AF_INET, SOCK_DGRAM, rcv_fds[4]);
+ for (i = 0; i < 9; ++i)
+ close(rcv_fds[i]);
+
+ fprintf(stderr, "---- UDP IPv6 ----\n");
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 4, 1, IP6_ADDR);
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL);
+ test(rcv_fds, 9, AF_INET6, SOCK_DGRAM, rcv_fds[4]);
+ for (i = 0; i < 9; ++i)
+ close(rcv_fds[i]);
+
+ fprintf(stderr, "---- UDP IPv4 mapped to IPv6 ----\n");
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 4, 1, IP4_MAPPED6);
+ build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL);
+ test(rcv_fds, 9, AF_INET, SOCK_DGRAM, rcv_fds[4]);
+ for (i = 0; i < 9; ++i)
+ close(rcv_fds[i]);
+
+ fprintf(stderr, "---- TCP IPv4 ----\n");
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL);
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 4, 1, IP4_ADDR);
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL);
+ test(rcv_fds, 9, AF_INET, SOCK_STREAM, rcv_fds[4]);
+ for (i = 0; i < 9; ++i)
+ close(rcv_fds[i]);
+
+ fprintf(stderr, "---- TCP IPv6 ----\n");
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 4, 1, IP6_ADDR);
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL);
+ test(rcv_fds, 9, AF_INET6, SOCK_STREAM, rcv_fds[4]);
+ for (i = 0; i < 9; ++i)
+ close(rcv_fds[i]);
+
+ fprintf(stderr, "---- TCP IPv4 mapped to IPv6 ----\n");
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 4, 1, IP4_MAPPED6);
+ build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL);
+ build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL);
+ test(rcv_fds, 9, AF_INET, SOCK_STREAM, rcv_fds[4]);
+ for (i = 0; i < 9; ++i)
+ close(rcv_fds[i]);
+
+ fprintf(stderr, "SUCCESS\n");
+ return 0;
+}
projects / openwrt / staging / blogic.git / commitdiff