| /* |
| * |
| * 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> |
| |
| #ifdef GPR_POSIX_SOCKET |
| |
| #include "src/core/lib/iomgr/tcp_client.h" |
| |
| #include <errno.h> |
| #include <netinet/in.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/time.h> |
| |
| #include "src/core/lib/iomgr/ev_posix.h" |
| #include "src/core/lib/iomgr/iomgr_posix.h" |
| #include "src/core/lib/iomgr/sockaddr_utils.h" |
| #include "src/core/lib/iomgr/socket_utils_posix.h" |
| #include "src/core/lib/iomgr/tcp_posix.h" |
| #include "src/core/lib/iomgr/timer.h" |
| #include "src/core/lib/iomgr/unix_sockets_posix.h" |
| #include "src/core/lib/support/string.h" |
| |
| extern int grpc_tcp_trace; |
| |
| typedef struct { |
| gpr_mu mu; |
| grpc_fd *fd; |
| gpr_timespec deadline; |
| grpc_timer alarm; |
| int refs; |
| grpc_closure write_closure; |
| grpc_pollset_set *interested_parties; |
| char *addr_str; |
| grpc_endpoint **ep; |
| grpc_closure *closure; |
| } async_connect; |
| |
| static grpc_error *prepare_socket(const struct sockaddr *addr, int fd) { |
| grpc_error *err = GRPC_ERROR_NONE; |
| |
| GPR_ASSERT(fd >= 0); |
| |
| err = grpc_set_socket_nonblocking(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| err = grpc_set_socket_cloexec(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| if (!grpc_is_unix_socket(addr)) { |
| err = grpc_set_socket_low_latency(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| } |
| err = grpc_set_socket_no_sigpipe_if_possible(fd); |
| if (err != GRPC_ERROR_NONE) goto error; |
| goto done; |
| |
| error: |
| if (fd >= 0) { |
| close(fd); |
| } |
| done: |
| return err; |
| } |
| |
| static void tc_on_alarm(grpc_exec_ctx *exec_ctx, void *acp, grpc_error *error) { |
| int done; |
| async_connect *ac = acp; |
| if (grpc_tcp_trace) { |
| const char *str = grpc_error_string(error); |
| gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_alarm: error=%s", ac->addr_str, |
| str); |
| grpc_error_free_string(str); |
| } |
| gpr_mu_lock(&ac->mu); |
| if (ac->fd != NULL) { |
| grpc_fd_shutdown(exec_ctx, ac->fd); |
| } |
| done = (--ac->refs == 0); |
| gpr_mu_unlock(&ac->mu); |
| if (done) { |
| gpr_mu_destroy(&ac->mu); |
| gpr_free(ac->addr_str); |
| gpr_free(ac); |
| } |
| } |
| |
| static void on_writable(grpc_exec_ctx *exec_ctx, void *acp, grpc_error *error) { |
| async_connect *ac = acp; |
| int so_error = 0; |
| socklen_t so_error_size; |
| int err; |
| int done; |
| grpc_endpoint **ep = ac->ep; |
| grpc_closure *closure = ac->closure; |
| grpc_fd *fd; |
| |
| GRPC_ERROR_REF(error); |
| |
| if (grpc_tcp_trace) { |
| const char *str = grpc_error_string(error); |
| gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_writable: error=%s", |
| ac->addr_str, str); |
| grpc_error_free_string(str); |
| } |
| |
| gpr_mu_lock(&ac->mu); |
| GPR_ASSERT(ac->fd); |
| fd = ac->fd; |
| ac->fd = NULL; |
| gpr_mu_unlock(&ac->mu); |
| |
| grpc_timer_cancel(exec_ctx, &ac->alarm); |
| |
| gpr_mu_lock(&ac->mu); |
| if (error == GRPC_ERROR_NONE) { |
| do { |
| so_error_size = sizeof(so_error); |
| err = getsockopt(grpc_fd_wrapped_fd(fd), SOL_SOCKET, SO_ERROR, &so_error, |
| &so_error_size); |
| } while (err < 0 && errno == EINTR); |
| if (err < 0) { |
| error = GRPC_OS_ERROR(errno, "getsockopt"); |
| 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"); |
| gpr_mu_unlock(&ac->mu); |
| grpc_fd_notify_on_write(exec_ctx, fd, &ac->write_closure); |
| return; |
| } else { |
| switch (so_error) { |
| case ECONNREFUSED: |
| error = grpc_error_set_int(error, GRPC_ERROR_INT_ERRNO, errno); |
| error = grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR, |
| "Connection refused"); |
| break; |
| default: |
| error = GRPC_OS_ERROR(errno, "getsockopt(SO_ERROR)"); |
| break; |
| } |
| goto finish; |
| } |
| } else { |
| grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd); |
| *ep = grpc_tcp_create(fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, ac->addr_str); |
| fd = NULL; |
| goto finish; |
| } |
| } else { |
| error = |
| grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR, "Timeout occurred"); |
| goto finish; |
| } |
| |
| GPR_UNREACHABLE_CODE(return ); |
| |
| finish: |
| if (fd != NULL) { |
| grpc_pollset_set_del_fd(exec_ctx, ac->interested_parties, fd); |
| grpc_fd_orphan(exec_ctx, fd, NULL, NULL, "tcp_client_orphan"); |
| fd = NULL; |
| } |
| done = (--ac->refs == 0); |
| gpr_mu_unlock(&ac->mu); |
| if (error != GRPC_ERROR_NONE) { |
| error = grpc_error_set_str(error, GRPC_ERROR_STR_DESCRIPTION, |
| "Failed to connect to remote host"); |
| error = |
| grpc_error_set_str(error, GRPC_ERROR_STR_TARGET_ADDRESS, ac->addr_str); |
| } |
| if (done) { |
| gpr_mu_destroy(&ac->mu); |
| gpr_free(ac->addr_str); |
| gpr_free(ac); |
| } |
| grpc_exec_ctx_sched(exec_ctx, closure, error, NULL); |
| } |
| |
| static void tcp_client_connect_impl(grpc_exec_ctx *exec_ctx, |
| grpc_closure *closure, grpc_endpoint **ep, |
| grpc_pollset_set *interested_parties, |
| const struct sockaddr *addr, |
| size_t 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; |
| grpc_fd *fdobj; |
| char *name; |
| char *addr_str; |
| grpc_error *error; |
| |
| *ep = NULL; |
| |
| /* Use dualstack sockets where available. */ |
| if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { |
| addr = (const struct sockaddr *)&addr6_v4mapped; |
| addr_len = sizeof(addr6_v4mapped); |
| } |
| |
| error = grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, &dsmode, &fd); |
| if (error != GRPC_ERROR_NONE) { |
| grpc_exec_ctx_sched(exec_ctx, closure, error, NULL); |
| return; |
| } |
| 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 ((error = prepare_socket(addr, fd)) != GRPC_ERROR_NONE) { |
| grpc_exec_ctx_sched(exec_ctx, closure, error, NULL); |
| return; |
| } |
| |
| do { |
| GPR_ASSERT(addr_len < ~(socklen_t)0); |
| err = connect(fd, addr, (socklen_t)addr_len); |
| } while (err < 0 && errno == EINTR); |
| |
| addr_str = grpc_sockaddr_to_uri(addr); |
| gpr_asprintf(&name, "tcp-client:%s", addr_str); |
| |
| fdobj = grpc_fd_create(fd, name); |
| |
| if (err >= 0) { |
| *ep = grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str); |
| grpc_exec_ctx_sched(exec_ctx, closure, GRPC_ERROR_NONE, NULL); |
| goto done; |
| } |
| |
| if (errno != EWOULDBLOCK && errno != EINPROGRESS) { |
| grpc_fd_orphan(exec_ctx, fdobj, NULL, NULL, "tcp_client_connect_error"); |
| grpc_exec_ctx_sched(exec_ctx, closure, GRPC_OS_ERROR(errno, "connect"), |
| NULL); |
| goto done; |
| } |
| |
| grpc_pollset_set_add_fd(exec_ctx, interested_parties, fdobj); |
| |
| ac = gpr_malloc(sizeof(async_connect)); |
| ac->closure = closure; |
| ac->ep = ep; |
| ac->fd = fdobj; |
| ac->interested_parties = interested_parties; |
| ac->addr_str = addr_str; |
| addr_str = NULL; |
| gpr_mu_init(&ac->mu); |
| ac->refs = 2; |
| ac->write_closure.cb = on_writable; |
| ac->write_closure.cb_arg = ac; |
| |
| if (grpc_tcp_trace) { |
| gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: asynchronously connecting", |
| ac->addr_str); |
| } |
| |
| gpr_mu_lock(&ac->mu); |
| grpc_timer_init(exec_ctx, &ac->alarm, |
| gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), |
| tc_on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC)); |
| grpc_fd_notify_on_write(exec_ctx, ac->fd, &ac->write_closure); |
| gpr_mu_unlock(&ac->mu); |
| |
| done: |
| gpr_free(name); |
| gpr_free(addr_str); |
| } |
| |
| // overridden by api_fuzzer.c |
| void (*grpc_tcp_client_connect_impl)( |
| grpc_exec_ctx *exec_ctx, grpc_closure *closure, grpc_endpoint **ep, |
| grpc_pollset_set *interested_parties, const struct sockaddr *addr, |
| size_t addr_len, gpr_timespec deadline) = tcp_client_connect_impl; |
| |
| void grpc_tcp_client_connect(grpc_exec_ctx *exec_ctx, grpc_closure *closure, |
| grpc_endpoint **ep, |
| grpc_pollset_set *interested_parties, |
| const struct sockaddr *addr, size_t addr_len, |
| gpr_timespec deadline) { |
| grpc_tcp_client_connect_impl(exec_ctx, closure, ep, interested_parties, addr, |
| addr_len, deadline); |
| } |
| |
| #endif |