| /* |
| * |
| * Copyright 2014, 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> |
| |
| #ifdef GPR_POSIX_SOCKET |
| |
| #include "src/core/iomgr/tcp_client.h" |
| |
| #include <errno.h> |
| #include <netinet/in.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "src/core/iomgr/alarm.h" |
| #include "src/core/iomgr/iomgr_posix.h" |
| #include "src/core/iomgr/pollset_posix.h" |
| #include "src/core/iomgr/sockaddr_utils.h" |
| #include "src/core/iomgr/socket_utils_posix.h" |
| #include "src/core/iomgr/tcp_posix.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/time.h> |
| |
| typedef struct { |
| void (*cb)(void *arg, grpc_endpoint *tcp); |
| void *cb_arg; |
| gpr_mu mu; |
| grpc_fd *fd; |
| gpr_timespec deadline; |
| grpc_alarm alarm; |
| int refs; |
| } async_connect; |
| |
| static int prepare_socket(const struct sockaddr* addr, int fd) { |
| if (fd < 0) { |
| goto error; |
| } |
| |
| if (!grpc_set_socket_nonblocking(fd, 1) || !grpc_set_socket_cloexec(fd, 1) || |
| (addr->sa_family != AF_UNIX && !grpc_set_socket_low_latency(fd, 1))) { |
| gpr_log(GPR_ERROR, "Unable to configure socket %d: %s", fd, |
| strerror(errno)); |
| goto error; |
| } |
| |
| return 1; |
| |
| error: |
| if (fd >= 0) { |
| close(fd); |
| } |
| return 0; |
| } |
| |
| static void on_alarm(void *acp, int success) { |
| int done; |
| async_connect *ac = acp; |
| gpr_mu_lock(&ac->mu); |
| if (ac->fd != NULL && success) { |
| grpc_fd_shutdown(ac->fd); |
| } |
| done = (--ac->refs == 0); |
| gpr_mu_unlock(&ac->mu); |
| if (done) { |
| gpr_mu_destroy(&ac->mu); |
| gpr_free(ac); |
| } |
| } |
| |
| static void on_writable(void *acp, int success) { |
| async_connect *ac = acp; |
| int so_error = 0; |
| socklen_t so_error_size; |
| int err; |
| int fd = ac->fd->fd; |
| int done; |
| grpc_endpoint *ep = NULL; |
| void (*cb)(void *arg, grpc_endpoint *tcp) = ac->cb; |
| void *cb_arg = ac->cb_arg; |
| |
| grpc_alarm_cancel(&ac->alarm); |
| |
| if (success) { |
| do { |
| so_error_size = sizeof(so_error); |
| err = getsockopt(fd, SOL_SOCKET, SO_ERROR, &so_error, &so_error_size); |
| } while (err < 0 && errno == EINTR); |
| if (err < 0) { |
| gpr_log(GPR_ERROR, "getsockopt(ERROR): %s", strerror(errno)); |
| goto finish; |
| } else if (so_error != 0) { |
| if (so_error == ENOBUFS) { |
| /* We will get one of these errors if we have run out of |
| memory in the kernel for the data structures allocated |
| when you connect a socket. If this happens it is very |
| likely that if we wait a little bit then try again the |
| connection will work (since other programs or this |
| program will close their network connections and free up |
| memory). This does _not_ indicate that there is anything |
| wrong with the server we are connecting to, this is a |
| local problem. |
| |
| If you are looking at this code, then chances are that |
| your program or another program on the same computer |
| opened too many network connections. The "easy" fix: |
| don't do that! */ |
| gpr_log(GPR_ERROR, "kernel out of buffers"); |
| grpc_fd_notify_on_write(ac->fd, on_writable, ac); |
| return; |
| } else { |
| switch (so_error) { |
| case ECONNREFUSED: |
| gpr_log(GPR_ERROR, "socket error: connection refused"); |
| break; |
| default: |
| gpr_log(GPR_ERROR, "socket error: %d", so_error); |
| break; |
| } |
| goto finish; |
| } |
| } else { |
| ep = grpc_tcp_create(ac->fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE); |
| goto finish; |
| } |
| } else { |
| gpr_log(GPR_ERROR, "on_writable failed during connect"); |
| goto finish; |
| } |
| |
| abort(); |
| |
| finish: |
| gpr_mu_lock(&ac->mu); |
| if (!ep) { |
| grpc_fd_orphan(ac->fd, NULL, NULL); |
| } |
| done = (--ac->refs == 0); |
| gpr_mu_unlock(&ac->mu); |
| if (done) { |
| gpr_mu_destroy(&ac->mu); |
| gpr_free(ac); |
| } |
| cb(cb_arg, ep); |
| } |
| |
| void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep), |
| void *arg, const struct sockaddr *addr, |
| int addr_len, gpr_timespec deadline) { |
| int fd; |
| grpc_dualstack_mode dsmode; |
| int err; |
| async_connect *ac; |
| struct sockaddr_in6 addr6_v4mapped; |
| struct sockaddr_in addr4_copy; |
| |
| /* Use dualstack sockets where available. */ |
| if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { |
| addr = (const struct sockaddr *)&addr6_v4mapped; |
| addr_len = sizeof(addr6_v4mapped); |
| } |
| |
| fd = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode); |
| if (fd < 0) { |
| gpr_log(GPR_ERROR, "Unable to create socket: %s", strerror(errno)); |
| } |
| if (dsmode == GRPC_DSMODE_IPV4) { |
| /* If we got an AF_INET socket, map the address back to IPv4. */ |
| GPR_ASSERT(grpc_sockaddr_is_v4mapped(addr, &addr4_copy)); |
| addr = (struct sockaddr *)&addr4_copy; |
| addr_len = sizeof(addr4_copy); |
| } |
| if (!prepare_socket(addr, fd)) { |
| cb(arg, NULL); |
| return; |
| } |
| |
| do { |
| err = connect(fd, addr, addr_len); |
| } while (err < 0 && errno == EINTR); |
| |
| if (err >= 0) { |
| gpr_log(GPR_DEBUG, "instant connect"); |
| cb(arg, |
| grpc_tcp_create(grpc_fd_create(fd), GRPC_TCP_DEFAULT_READ_SLICE_SIZE)); |
| return; |
| } |
| |
| if (errno != EWOULDBLOCK && errno != EINPROGRESS) { |
| gpr_log(GPR_ERROR, "connect error: %s", strerror(errno)); |
| close(fd); |
| cb(arg, NULL); |
| return; |
| } |
| |
| ac = gpr_malloc(sizeof(async_connect)); |
| ac->cb = cb; |
| ac->cb_arg = arg; |
| ac->fd = grpc_fd_create(fd); |
| gpr_mu_init(&ac->mu); |
| ac->refs = 2; |
| |
| grpc_alarm_init(&ac->alarm, deadline, on_alarm, ac, gpr_now()); |
| grpc_fd_notify_on_write(ac->fd, on_writable, ac); |
| } |
| |
| #endif |