diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/core/util/port_windows.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/test/core/util/port_windows.c b/test/core/util/port_windows.c new file mode 100644 index 0000000000..279aa2d21b --- /dev/null +++ b/test/core/util/port_windows.c @@ -0,0 +1,159 @@ +/* + * + * Copyright 2015, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <grpc/support/port_platform.h> +#include "test/core/util/test_config.h" +#if defined(GPR_WINSOCK_SOCKET) && defined(GRPC_TEST_PICK_PORT) + +#include "test/core/util/port.h" + +#include <netinet/in.h> +#include <sys/socket.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <unistd.h> + +#include <grpc/support/log.h> + +#define NUM_RANDOM_PORTS_TO_PICK 100 + +static int is_port_available(int *port, int is_tcp) { + const int proto = is_tcp ? IPPROTO_TCP : 0; + const int fd = socket(AF_INET, is_tcp ? SOCK_STREAM : SOCK_DGRAM, proto); + int one = 1; + struct sockaddr_in addr; + socklen_t alen = sizeof(addr); + int actual_port; + + GPR_ASSERT(*port >= 0); + GPR_ASSERT(*port <= 65535); + if (fd < 0) { + gpr_log(GPR_ERROR, "socket() failed: %s", strerror(errno)); + return 0; + } + + /* Reuseaddr lets us start up a server immediately after it exits */ + if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) { + gpr_log(GPR_ERROR, "setsockopt() failed: %s", strerror(errno)); + close(fd); + return 0; + } + + /* Try binding to port */ + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = INADDR_ANY; + addr.sin_port = htons(*port); + if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) { + gpr_log(GPR_DEBUG, "bind(port=%d) failed: %s", *port, strerror(errno)); + close(fd); + return 0; + } + + /* Get the bound port number */ + if (getsockname(fd, (struct sockaddr *)&addr, &alen) < 0) { + gpr_log(GPR_ERROR, "getsockname() failed: %s", strerror(errno)); + close(fd); + return 0; + } + GPR_ASSERT(alen <= sizeof(addr)); + actual_port = ntohs(addr.sin_port); + GPR_ASSERT(actual_port > 0); + if (*port == 0) { + *port = actual_port; + } else { + GPR_ASSERT(*port == actual_port); + } + + close(fd); + return 1; +} + +int grpc_pick_unused_port(void) { + /* We repeatedly pick a port and then see whether or not it is + available for use both as a TCP socket and a UDP socket. First, we + pick a random large port number. For subsequent + iterations, we bind to an anonymous port and let the OS pick the + port number. The random port picking reduces the probability of + races with other processes on kernels that want to reuse the same + port numbers over and over. */ + + /* In alternating iterations we try UDP ports before TCP ports UDP + ports -- it could be the case that this machine has been using up + UDP ports and they are scarcer. */ + + /* Type of port to first pick in next iteration */ + int is_tcp = 1; + int try = 0; + + for (;;) { + int port; + try++; + if (try == 1) { + port = getpid() % (65536 - 30000) + 30000; + } else if (try <= NUM_RANDOM_PORTS_TO_PICK) { + port = rand() % (65536 - 30000) + 30000; + } else { + port = 0; + } + + if (!is_port_available(&port, is_tcp)) { + continue; + } + + GPR_ASSERT(port > 0); + /* Check that the port # is free for the other type of socket also */ + if (!is_port_available(&port, !is_tcp)) { + /* In the next iteration try to bind to the other type first + because perhaps it is more rare. */ + is_tcp = !is_tcp; + continue; + } + + /* TODO(ctiller): consider caching this port in some structure, to avoid + handing it out again */ + + return port; + } + + /* The port iterator reached the end without finding a suitable port. */ + return 0; +} + +int grpc_pick_unused_port_or_die(void) { + int port = grpc_pick_unused_port(); + GPR_ASSERT(port > 0); + return port; +} + +#endif /* GPR_WINSOCK_SOCKET && GRPC_TEST_PICK_PORT */ |