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socket.c
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socket.c
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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/io/socket.h>
#include <aws/common/clock.h>
#include <aws/common/condition_variable.h>
#include <aws/common/mutex.h>
#include <aws/common/string.h>
#include <aws/common/uuid.h>
#include <aws/io/event_loop.h>
#include <aws/io/logging.h>
#include <arpa/inet.h>
#include <aws/io/io.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
/*
* On OsX, suppress NoPipe signals via flags to setsockopt()
* On Linux, suppress NoPipe signals via flags to send()
*/
#if defined(__MACH__)
# define NO_SIGNAL_SOCK_OPT SO_NOSIGPIPE
# define NO_SIGNAL_SEND 0
# define TCP_KEEPIDLE TCP_KEEPALIVE
#else
# define NO_SIGNAL_SEND MSG_NOSIGNAL
#endif
/* This isn't defined on ancient linux distros (breaking the builds).
* However, if this is a prebuild, we purposely build on an ancient system, but
* we want the kernel calls to still be the same as a modern build since that's likely the target of the application
* calling this code. Just define this if it isn't there already. GlibC and the kernel don't really care how the flag
* gets passed as long as it does.
*/
#ifndef O_CLOEXEC
# define O_CLOEXEC 02000000
#endif
#ifdef USE_VSOCK
# if defined(__linux__) && defined(AF_VSOCK)
# include <linux/vm_sockets.h>
# else
# error "USE_VSOCK not supported on current platform"
# endif
#endif
/* other than CONNECTED_READ | CONNECTED_WRITE
* a socket is only in one of these states at a time. */
enum socket_state {
INIT = 0x01,
CONNECTING = 0x02,
CONNECTED_READ = 0x04,
CONNECTED_WRITE = 0x08,
BOUND = 0x10,
LISTENING = 0x20,
TIMEDOUT = 0x40,
ERROR = 0x80,
CLOSED,
};
static int s_convert_domain(enum aws_socket_domain domain) {
switch (domain) {
case AWS_SOCKET_IPV4:
return AF_INET;
case AWS_SOCKET_IPV6:
return AF_INET6;
case AWS_SOCKET_LOCAL:
return AF_UNIX;
#ifdef USE_VSOCK
case AWS_SOCKET_VSOCK:
return AF_VSOCK;
#endif
default:
AWS_ASSERT(0);
return AF_INET;
}
}
static int s_convert_type(enum aws_socket_type type) {
switch (type) {
case AWS_SOCKET_STREAM:
return SOCK_STREAM;
case AWS_SOCKET_DGRAM:
return SOCK_DGRAM;
default:
AWS_ASSERT(0);
return SOCK_STREAM;
}
}
static int s_determine_socket_error(int error) {
switch (error) {
case ECONNREFUSED:
return AWS_IO_SOCKET_CONNECTION_REFUSED;
case ECONNRESET:
return AWS_IO_SOCKET_CLOSED;
case ETIMEDOUT:
return AWS_IO_SOCKET_TIMEOUT;
case EHOSTUNREACH:
case ENETUNREACH:
return AWS_IO_SOCKET_NO_ROUTE_TO_HOST;
case EADDRNOTAVAIL:
return AWS_IO_SOCKET_INVALID_ADDRESS;
case ENETDOWN:
return AWS_IO_SOCKET_NETWORK_DOWN;
case ECONNABORTED:
return AWS_IO_SOCKET_CONNECT_ABORTED;
case EADDRINUSE:
return AWS_IO_SOCKET_ADDRESS_IN_USE;
case ENOBUFS:
case ENOMEM:
return AWS_ERROR_OOM;
case EAGAIN:
return AWS_IO_READ_WOULD_BLOCK;
case EMFILE:
case ENFILE:
return AWS_ERROR_MAX_FDS_EXCEEDED;
case ENOENT:
case EINVAL:
return AWS_ERROR_FILE_INVALID_PATH;
case EAFNOSUPPORT:
return AWS_IO_SOCKET_UNSUPPORTED_ADDRESS_FAMILY;
case EACCES:
return AWS_ERROR_NO_PERMISSION;
default:
return AWS_IO_SOCKET_NOT_CONNECTED;
}
}
static int s_create_socket(struct aws_socket *sock, const struct aws_socket_options *options) {
int fd = socket(s_convert_domain(options->domain), s_convert_type(options->type), 0);
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_DEBUG(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: initializing with domain %d and type %d",
(void *)sock,
fd,
options->domain,
options->type);
if (fd != -1) {
int flags = fcntl(fd, F_GETFL, 0);
flags |= O_NONBLOCK | O_CLOEXEC;
int success = fcntl(fd, F_SETFL, flags);
(void)success;
sock->io_handle.data.fd = fd;
sock->io_handle.additional_data = NULL;
return aws_socket_set_options(sock, options);
}
int aws_error = s_determine_socket_error(errno_value);
return aws_raise_error(aws_error);
}
struct posix_socket_connect_args {
struct aws_task task;
struct aws_allocator *allocator;
struct aws_socket *socket;
};
struct posix_socket {
struct aws_linked_list write_queue;
struct aws_linked_list written_queue;
struct aws_task written_task;
struct posix_socket_connect_args *connect_args;
/* Note that only the posix_socket impl part is refcounted.
* The public aws_socket can be a stack variable and cleaned up synchronously
* (by blocking until the event-loop cleans up the impl part).
* In hindsight, aws_socket should have been heap-allocated and refcounted, but alas */
struct aws_ref_count internal_refcount;
struct aws_allocator *allocator;
bool written_task_scheduled;
bool currently_subscribed;
bool continue_accept;
bool *close_happened;
};
static void s_socket_destroy_impl(void *user_data) {
struct posix_socket *socket_impl = user_data;
aws_mem_release(socket_impl->allocator, socket_impl);
}
static int s_socket_init(
struct aws_socket *socket,
struct aws_allocator *alloc,
const struct aws_socket_options *options,
int existing_socket_fd) {
AWS_ASSERT(options);
AWS_ZERO_STRUCT(*socket);
struct posix_socket *posix_socket = aws_mem_calloc(alloc, 1, sizeof(struct posix_socket));
if (!posix_socket) {
socket->impl = NULL;
return AWS_OP_ERR;
}
socket->allocator = alloc;
socket->io_handle.data.fd = -1;
socket->state = INIT;
socket->options = *options;
if (existing_socket_fd < 0) {
int err = s_create_socket(socket, options);
if (err) {
aws_mem_release(alloc, posix_socket);
socket->impl = NULL;
return AWS_OP_ERR;
}
} else {
socket->io_handle = (struct aws_io_handle){
.data = {.fd = existing_socket_fd},
.additional_data = NULL,
};
aws_socket_set_options(socket, options);
}
aws_linked_list_init(&posix_socket->write_queue);
aws_linked_list_init(&posix_socket->written_queue);
posix_socket->currently_subscribed = false;
posix_socket->continue_accept = false;
aws_ref_count_init(&posix_socket->internal_refcount, posix_socket, s_socket_destroy_impl);
posix_socket->allocator = alloc;
posix_socket->connect_args = NULL;
posix_socket->close_happened = NULL;
socket->impl = posix_socket;
return AWS_OP_SUCCESS;
}
int aws_socket_init(struct aws_socket *socket, struct aws_allocator *alloc, const struct aws_socket_options *options) {
AWS_ASSERT(options);
return s_socket_init(socket, alloc, options, -1);
}
void aws_socket_clean_up(struct aws_socket *socket) {
if (!socket->impl) {
/* protect from double clean */
return;
}
int fd_for_logging = socket->io_handle.data.fd; /* socket's fd gets reset before final log */
(void)fd_for_logging;
if (aws_socket_is_open(socket)) {
AWS_LOGF_DEBUG(AWS_LS_IO_SOCKET, "id=%p fd=%d: is still open, closing...", (void *)socket, fd_for_logging);
aws_socket_close(socket);
}
struct posix_socket *socket_impl = socket->impl;
if (aws_ref_count_release(&socket_impl->internal_refcount) != 0) {
AWS_LOGF_DEBUG(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: is still pending io letting it dangle and cleaning up later.",
(void *)socket,
fd_for_logging);
}
AWS_ZERO_STRUCT(*socket);
socket->io_handle.data.fd = -1;
}
/* Update socket->local_endpoint based on the results of getsockname() */
static int s_update_local_endpoint(struct aws_socket *socket) {
struct aws_socket_endpoint tmp_endpoint;
AWS_ZERO_STRUCT(tmp_endpoint);
struct sockaddr_storage address;
AWS_ZERO_STRUCT(address);
socklen_t address_size = sizeof(address);
if (getsockname(socket->io_handle.data.fd, (struct sockaddr *)&address, &address_size) != 0) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: getsockname() failed with error %d",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
int aws_error = s_determine_socket_error(errno_value);
return aws_raise_error(aws_error);
}
if (address.ss_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *)&address;
tmp_endpoint.port = ntohs(s->sin_port);
if (inet_ntop(AF_INET, &s->sin_addr, tmp_endpoint.address, sizeof(tmp_endpoint.address)) == NULL) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: inet_ntop() failed with error %d",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
int aws_error = s_determine_socket_error(errno_value);
return aws_raise_error(aws_error);
}
} else if (address.ss_family == AF_INET6) {
struct sockaddr_in6 *s = (struct sockaddr_in6 *)&address;
tmp_endpoint.port = ntohs(s->sin6_port);
if (inet_ntop(AF_INET6, &s->sin6_addr, tmp_endpoint.address, sizeof(tmp_endpoint.address)) == NULL) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: inet_ntop() failed with error %d",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
int aws_error = s_determine_socket_error(errno_value);
return aws_raise_error(aws_error);
}
} else if (address.ss_family == AF_UNIX) {
struct sockaddr_un *s = (struct sockaddr_un *)&address;
/* Ensure there's a null-terminator.
* On some platforms it may be missing when the path gets very long. See:
* https://man7.org/linux/man-pages/man7/unix.7.html#BUGS
* But let's keep it simple, and not deal with that madness until someone demands it. */
size_t sun_len;
if (aws_secure_strlen(s->sun_path, sizeof(tmp_endpoint.address), &sun_len)) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: UNIX domain socket name is too long",
(void *)socket,
socket->io_handle.data.fd);
return aws_raise_error(AWS_IO_SOCKET_INVALID_ADDRESS);
}
memcpy(tmp_endpoint.address, s->sun_path, sun_len);
#if USE_VSOCK
} else if (address.ss_family == AF_VSOCK) {
struct sockaddr_vm *s = (struct sockaddr_vm *)&address;
/* VSOCK port is 32bit, but aws_socket_endpoint.port is only 16bit.
* Hopefully this isn't an issue, since users can only pass in 16bit values.
* But if it becomes an issue, we'll need to make aws_socket_endpoint more flexible */
if (s->svm_port > UINT16_MAX) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: aws_socket_endpoint can't deal with VSOCK port > UINT16_MAX",
(void *)socket,
socket->io_handle.data.fd);
return aws_raise_error(AWS_IO_SOCKET_INVALID_ADDRESS);
}
tmp_endpoint.port = (uint16_t)s->svm_port;
snprintf(tmp_endpoint.address, sizeof(tmp_endpoint.address), "%" PRIu32, s->svm_cid);
return AWS_OP_SUCCESS;
#endif /* USE_VSOCK */
} else {
AWS_ASSERT(0);
return aws_raise_error(AWS_IO_SOCKET_UNSUPPORTED_ADDRESS_FAMILY);
}
socket->local_endpoint = tmp_endpoint;
return AWS_OP_SUCCESS;
}
static void s_on_connection_error(struct aws_socket *socket, int error);
static int s_on_connection_success(struct aws_socket *socket) {
struct aws_event_loop *event_loop = socket->event_loop;
struct posix_socket *socket_impl = socket->impl;
if (socket_impl->currently_subscribed) {
aws_event_loop_unsubscribe_from_io_events(socket->event_loop, &socket->io_handle);
socket_impl->currently_subscribed = false;
}
socket->event_loop = NULL;
int connect_result;
socklen_t result_length = sizeof(connect_result);
if (getsockopt(socket->io_handle.data.fd, SOL_SOCKET, SO_ERROR, &connect_result, &result_length) < 0) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: failed to determine connection error %d",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
int aws_error = s_determine_socket_error(errno_value);
aws_raise_error(aws_error);
s_on_connection_error(socket, aws_error);
return AWS_OP_ERR;
}
if (connect_result) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: connection error %d",
(void *)socket,
socket->io_handle.data.fd,
connect_result);
int aws_error = s_determine_socket_error(connect_result);
aws_raise_error(aws_error);
s_on_connection_error(socket, aws_error);
return AWS_OP_ERR;
}
AWS_LOGF_INFO(AWS_LS_IO_SOCKET, "id=%p fd=%d: connection success", (void *)socket, socket->io_handle.data.fd);
if (s_update_local_endpoint(socket)) {
s_on_connection_error(socket, aws_last_error());
return AWS_OP_ERR;
}
socket->state = CONNECTED_WRITE | CONNECTED_READ;
if (aws_socket_assign_to_event_loop(socket, event_loop)) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: assignment to event loop %p failed with error %d",
(void *)socket,
socket->io_handle.data.fd,
(void *)event_loop,
aws_last_error());
s_on_connection_error(socket, aws_last_error());
return AWS_OP_ERR;
}
socket->connection_result_fn(socket, AWS_ERROR_SUCCESS, socket->connect_accept_user_data);
return AWS_OP_SUCCESS;
}
static void s_on_connection_error(struct aws_socket *socket, int error) {
socket->state = ERROR;
AWS_LOGF_ERROR(AWS_LS_IO_SOCKET, "id=%p fd=%d: connection failure", (void *)socket, socket->io_handle.data.fd);
if (socket->connection_result_fn) {
socket->connection_result_fn(socket, error, socket->connect_accept_user_data);
} else if (socket->accept_result_fn) {
socket->accept_result_fn(socket, error, NULL, socket->connect_accept_user_data);
}
}
/* the next two callbacks compete based on which one runs first. if s_socket_connect_event
* comes back first, then we set socket_args->socket = NULL and continue on with the connection.
* if s_handle_socket_timeout() runs first, is sees socket_args->socket is NULL and just cleans up its memory.
* s_handle_socket_timeout() will always run so the memory for socket_connect_args is always cleaned up there. */
static void s_socket_connect_event(
struct aws_event_loop *event_loop,
struct aws_io_handle *handle,
int events,
void *user_data) {
(void)event_loop;
(void)handle;
struct posix_socket_connect_args *socket_args = (struct posix_socket_connect_args *)user_data;
AWS_LOGF_TRACE(AWS_LS_IO_SOCKET, "fd=%d: connection activity handler triggered ", handle->data.fd);
if (socket_args->socket) {
AWS_LOGF_TRACE(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: has not timed out yet proceeding with connection.",
(void *)socket_args->socket,
handle->data.fd);
struct posix_socket *socket_impl = socket_args->socket->impl;
if (!(events & AWS_IO_EVENT_TYPE_ERROR || events & AWS_IO_EVENT_TYPE_CLOSED) &&
(events & AWS_IO_EVENT_TYPE_READABLE || events & AWS_IO_EVENT_TYPE_WRITABLE)) {
struct aws_socket *socket = socket_args->socket;
socket_args->socket = NULL;
socket_impl->connect_args = NULL;
s_on_connection_success(socket);
return;
}
int aws_error = aws_socket_get_error(socket_args->socket);
/* we'll get another notification. */
if (aws_error == AWS_IO_READ_WOULD_BLOCK) {
AWS_LOGF_TRACE(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: spurious event, waiting for another notification.",
(void *)socket_args->socket,
handle->data.fd);
return;
}
struct aws_socket *socket = socket_args->socket;
socket_args->socket = NULL;
socket_impl->connect_args = NULL;
aws_raise_error(aws_error);
s_on_connection_error(socket, aws_error);
}
}
static void s_handle_socket_timeout(struct aws_task *task, void *args, aws_task_status status) {
(void)task;
(void)status;
struct posix_socket_connect_args *socket_args = args;
AWS_LOGF_TRACE(AWS_LS_IO_SOCKET, "task_id=%p: timeout task triggered, evaluating timeouts.", (void *)task);
/* successful connection will have nulled out connect_args->socket */
if (socket_args->socket) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: timed out, shutting down.",
(void *)socket_args->socket,
socket_args->socket->io_handle.data.fd);
socket_args->socket->state = TIMEDOUT;
int error_code = AWS_IO_SOCKET_TIMEOUT;
if (status == AWS_TASK_STATUS_RUN_READY) {
aws_event_loop_unsubscribe_from_io_events(socket_args->socket->event_loop, &socket_args->socket->io_handle);
} else {
error_code = AWS_IO_EVENT_LOOP_SHUTDOWN;
aws_event_loop_free_io_event_resources(socket_args->socket->event_loop, &socket_args->socket->io_handle);
}
socket_args->socket->event_loop = NULL;
struct posix_socket *socket_impl = socket_args->socket->impl;
socket_impl->currently_subscribed = false;
aws_raise_error(error_code);
struct aws_socket *socket = socket_args->socket;
/*socket close sets socket_args->socket to NULL and
* socket_impl->connect_args to NULL. */
aws_socket_close(socket);
s_on_connection_error(socket, error_code);
}
aws_mem_release(socket_args->allocator, socket_args);
}
/* this is used simply for moving a connect_success callback when the connect finished immediately
* (like for unix domain sockets) into the event loop's thread. Also note, in that case there was no
* timeout task scheduled, so in this case the socket_args are cleaned up. */
static void s_run_connect_success(struct aws_task *task, void *arg, enum aws_task_status status) {
(void)task;
struct posix_socket_connect_args *socket_args = arg;
if (socket_args->socket) {
struct posix_socket *socket_impl = socket_args->socket->impl;
if (status == AWS_TASK_STATUS_RUN_READY) {
s_on_connection_success(socket_args->socket);
} else {
aws_raise_error(AWS_IO_SOCKET_CONNECT_ABORTED);
socket_args->socket->event_loop = NULL;
s_on_connection_error(socket_args->socket, AWS_IO_SOCKET_CONNECT_ABORTED);
}
socket_impl->connect_args = NULL;
}
aws_mem_release(socket_args->allocator, socket_args);
}
static inline int s_convert_pton_error(int pton_code, int errno_value) {
if (pton_code == 0) {
return AWS_IO_SOCKET_INVALID_ADDRESS;
}
return s_determine_socket_error(errno_value);
}
struct socket_address {
union sock_addr_types {
struct sockaddr_in addr_in;
struct sockaddr_in6 addr_in6;
struct sockaddr_un un_addr;
#ifdef USE_VSOCK
struct sockaddr_vm vm_addr;
#endif
} sock_addr_types;
};
#ifdef USE_VSOCK
/** Convert a string to a VSOCK CID. Respects the calling convetion of inet_pton:
* 0 on error, 1 on success. */
static int parse_cid(const char *cid_str, unsigned int *value) {
if (cid_str == NULL || value == NULL) {
errno = EINVAL;
return 0;
}
/* strtoll returns 0 as both error and correct value */
errno = 0;
/* unsigned long long to handle edge cases in convention explicitly */
long long cid = strtoll(cid_str, NULL, 10);
if (errno != 0) {
return 0;
}
/* -1U means any, so it's a valid value, but it needs to be converted to
* unsigned int. */
if (cid == -1) {
*value = VMADDR_CID_ANY;
return 1;
}
if (cid < 0 || cid > UINT_MAX) {
errno = ERANGE;
return 0;
}
/* cast is safe here, edge cases already checked */
*value = (unsigned int)cid;
return 1;
}
#endif
int aws_socket_connect(
struct aws_socket *socket,
const struct aws_socket_endpoint *remote_endpoint,
struct aws_event_loop *event_loop,
aws_socket_on_connection_result_fn *on_connection_result,
void *user_data) {
AWS_ASSERT(event_loop);
AWS_ASSERT(!socket->event_loop);
AWS_LOGF_DEBUG(AWS_LS_IO_SOCKET, "id=%p fd=%d: beginning connect.", (void *)socket, socket->io_handle.data.fd);
if (socket->event_loop) {
return aws_raise_error(AWS_IO_EVENT_LOOP_ALREADY_ASSIGNED);
}
if (socket->options.type != AWS_SOCKET_DGRAM) {
AWS_ASSERT(on_connection_result);
if (socket->state != INIT) {
return aws_raise_error(AWS_IO_SOCKET_ILLEGAL_OPERATION_FOR_STATE);
}
} else { /* UDP socket */
/* UDP sockets jump to CONNECT_READ if bind is called first */
if (socket->state != CONNECTED_READ && socket->state != INIT) {
return aws_raise_error(AWS_IO_SOCKET_ILLEGAL_OPERATION_FOR_STATE);
}
}
size_t address_strlen;
if (aws_secure_strlen(remote_endpoint->address, AWS_ADDRESS_MAX_LEN, &address_strlen)) {
return AWS_OP_ERR;
}
struct socket_address address;
AWS_ZERO_STRUCT(address);
socklen_t sock_size = 0;
int pton_err = 1;
if (socket->options.domain == AWS_SOCKET_IPV4) {
pton_err = inet_pton(AF_INET, remote_endpoint->address, &address.sock_addr_types.addr_in.sin_addr);
address.sock_addr_types.addr_in.sin_port = htons(remote_endpoint->port);
address.sock_addr_types.addr_in.sin_family = AF_INET;
sock_size = sizeof(address.sock_addr_types.addr_in);
} else if (socket->options.domain == AWS_SOCKET_IPV6) {
pton_err = inet_pton(AF_INET6, remote_endpoint->address, &address.sock_addr_types.addr_in6.sin6_addr);
address.sock_addr_types.addr_in6.sin6_port = htons(remote_endpoint->port);
address.sock_addr_types.addr_in6.sin6_family = AF_INET6;
sock_size = sizeof(address.sock_addr_types.addr_in6);
} else if (socket->options.domain == AWS_SOCKET_LOCAL) {
address.sock_addr_types.un_addr.sun_family = AF_UNIX;
strncpy(address.sock_addr_types.un_addr.sun_path, remote_endpoint->address, AWS_ADDRESS_MAX_LEN);
sock_size = sizeof(address.sock_addr_types.un_addr);
#ifdef USE_VSOCK
} else if (socket->options.domain == AWS_SOCKET_VSOCK) {
pton_err = parse_cid(remote_endpoint->address, &address.sock_addr_types.vm_addr.svm_cid);
address.sock_addr_types.vm_addr.svm_family = AF_VSOCK;
address.sock_addr_types.vm_addr.svm_port = (unsigned int)remote_endpoint->port;
sock_size = sizeof(address.sock_addr_types.vm_addr);
#endif
} else {
AWS_ASSERT(0);
return aws_raise_error(AWS_IO_SOCKET_UNSUPPORTED_ADDRESS_FAMILY);
}
if (pton_err != 1) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: failed to parse address %s:%d.",
(void *)socket,
socket->io_handle.data.fd,
remote_endpoint->address,
(int)remote_endpoint->port);
return aws_raise_error(s_convert_pton_error(pton_err, errno_value));
}
AWS_LOGF_DEBUG(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: connecting to endpoint %s:%d.",
(void *)socket,
socket->io_handle.data.fd,
remote_endpoint->address,
(int)remote_endpoint->port);
socket->state = CONNECTING;
socket->remote_endpoint = *remote_endpoint;
socket->connect_accept_user_data = user_data;
socket->connection_result_fn = on_connection_result;
struct posix_socket *socket_impl = socket->impl;
socket_impl->connect_args = aws_mem_calloc(socket->allocator, 1, sizeof(struct posix_socket_connect_args));
if (!socket_impl->connect_args) {
return AWS_OP_ERR;
}
socket_impl->connect_args->socket = socket;
socket_impl->connect_args->allocator = socket->allocator;
socket_impl->connect_args->task.fn = s_handle_socket_timeout;
socket_impl->connect_args->task.arg = socket_impl->connect_args;
int error_code = connect(socket->io_handle.data.fd, (struct sockaddr *)&address.sock_addr_types, sock_size);
socket->event_loop = event_loop;
if (!error_code) {
AWS_LOGF_INFO(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: connected immediately, not scheduling timeout.",
(void *)socket,
socket->io_handle.data.fd);
socket_impl->connect_args->task.fn = s_run_connect_success;
/* the subscription for IO will happen once we setup the connection in the task. Since we already
* know the connection succeeded, we don't need to register for events yet. */
aws_event_loop_schedule_task_now(event_loop, &socket_impl->connect_args->task);
}
if (error_code) {
int errno_value = errno; /* Always cache errno before potential side-effect */
if (errno_value == EINPROGRESS || errno_value == EALREADY) {
AWS_LOGF_TRACE(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: connection pending waiting on event-loop notification or timeout.",
(void *)socket,
socket->io_handle.data.fd);
/* cache the timeout task; it is possible for the IO subscription to come back virtually immediately
* and null out the connect args */
struct aws_task *timeout_task = &socket_impl->connect_args->task;
socket_impl->currently_subscribed = true;
/* This event is for when the connection finishes. (the fd will flip writable). */
if (aws_event_loop_subscribe_to_io_events(
event_loop,
&socket->io_handle,
AWS_IO_EVENT_TYPE_WRITABLE,
s_socket_connect_event,
socket_impl->connect_args)) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: failed to register with event-loop %p.",
(void *)socket,
socket->io_handle.data.fd,
(void *)event_loop);
socket_impl->currently_subscribed = false;
socket->event_loop = NULL;
goto err_clean_up;
}
/* schedule a task to run at the connect timeout interval, if this task runs before the connect
* happens, we consider that a timeout. */
uint64_t timeout = 0;
aws_event_loop_current_clock_time(event_loop, &timeout);
timeout += aws_timestamp_convert(
socket->options.connect_timeout_ms, AWS_TIMESTAMP_MILLIS, AWS_TIMESTAMP_NANOS, NULL);
AWS_LOGF_TRACE(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: scheduling timeout task for %llu.",
(void *)socket,
socket->io_handle.data.fd,
(unsigned long long)timeout);
aws_event_loop_schedule_task_future(event_loop, timeout_task, timeout);
} else {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: connect failed with error code %d.",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
int aws_error = s_determine_socket_error(errno_value);
aws_raise_error(aws_error);
socket->event_loop = NULL;
socket_impl->currently_subscribed = false;
goto err_clean_up;
}
}
return AWS_OP_SUCCESS;
err_clean_up:
aws_mem_release(socket->allocator, socket_impl->connect_args);
socket_impl->connect_args = NULL;
return AWS_OP_ERR;
}
int aws_socket_bind(struct aws_socket *socket, const struct aws_socket_endpoint *local_endpoint) {
if (socket->state != INIT) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: invalid state for bind operation.",
(void *)socket,
socket->io_handle.data.fd);
return aws_raise_error(AWS_IO_SOCKET_ILLEGAL_OPERATION_FOR_STATE);
}
size_t address_strlen;
if (aws_secure_strlen(local_endpoint->address, AWS_ADDRESS_MAX_LEN, &address_strlen)) {
return AWS_OP_ERR;
}
AWS_LOGF_INFO(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: binding to %s:%d.",
(void *)socket,
socket->io_handle.data.fd,
local_endpoint->address,
(int)local_endpoint->port);
struct socket_address address;
AWS_ZERO_STRUCT(address);
socklen_t sock_size = 0;
int pton_err = 1;
if (socket->options.domain == AWS_SOCKET_IPV4) {
pton_err = inet_pton(AF_INET, local_endpoint->address, &address.sock_addr_types.addr_in.sin_addr);
address.sock_addr_types.addr_in.sin_port = htons(local_endpoint->port);
address.sock_addr_types.addr_in.sin_family = AF_INET;
sock_size = sizeof(address.sock_addr_types.addr_in);
} else if (socket->options.domain == AWS_SOCKET_IPV6) {
pton_err = inet_pton(AF_INET6, local_endpoint->address, &address.sock_addr_types.addr_in6.sin6_addr);
address.sock_addr_types.addr_in6.sin6_port = htons(local_endpoint->port);
address.sock_addr_types.addr_in6.sin6_family = AF_INET6;
sock_size = sizeof(address.sock_addr_types.addr_in6);
} else if (socket->options.domain == AWS_SOCKET_LOCAL) {
address.sock_addr_types.un_addr.sun_family = AF_UNIX;
strncpy(address.sock_addr_types.un_addr.sun_path, local_endpoint->address, AWS_ADDRESS_MAX_LEN);
sock_size = sizeof(address.sock_addr_types.un_addr);
#ifdef USE_VSOCK
} else if (socket->options.domain == AWS_SOCKET_VSOCK) {
pton_err = parse_cid(local_endpoint->address, &address.sock_addr_types.vm_addr.svm_cid);
address.sock_addr_types.vm_addr.svm_family = AF_VSOCK;
address.sock_addr_types.vm_addr.svm_port = (unsigned int)local_endpoint->port;
sock_size = sizeof(address.sock_addr_types.vm_addr);
#endif
} else {
AWS_ASSERT(0);
return aws_raise_error(AWS_IO_SOCKET_UNSUPPORTED_ADDRESS_FAMILY);
}
if (pton_err != 1) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: failed to parse address %s:%d.",
(void *)socket,
socket->io_handle.data.fd,
local_endpoint->address,
(int)local_endpoint->port);
return aws_raise_error(s_convert_pton_error(pton_err, errno_value));
}
if (bind(socket->io_handle.data.fd, (struct sockaddr *)&address.sock_addr_types, sock_size) != 0) {
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: bind failed with error code %d",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
aws_raise_error(s_determine_socket_error(errno_value));
goto error;
}
if (s_update_local_endpoint(socket)) {
goto error;
}
if (socket->options.type == AWS_SOCKET_STREAM) {
socket->state = BOUND;
} else {
/* e.g. UDP is now readable */
socket->state = CONNECTED_READ;
}
AWS_LOGF_DEBUG(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: successfully bound to %s:%d",
(void *)socket,
socket->io_handle.data.fd,
socket->local_endpoint.address,
socket->local_endpoint.port);
return AWS_OP_SUCCESS;
error:
socket->state = ERROR;
return AWS_OP_ERR;
}
int aws_socket_get_bound_address(const struct aws_socket *socket, struct aws_socket_endpoint *out_address) {
if (socket->local_endpoint.address[0] == 0) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: Socket has no local address. Socket must be bound first.",
(void *)socket,
socket->io_handle.data.fd);
return aws_raise_error(AWS_IO_SOCKET_ILLEGAL_OPERATION_FOR_STATE);
}
*out_address = socket->local_endpoint;
return AWS_OP_SUCCESS;
}
int aws_socket_listen(struct aws_socket *socket, int backlog_size) {
if (socket->state != BOUND) {
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: invalid state for listen operation. You must call bind first.",
(void *)socket,
socket->io_handle.data.fd);
return aws_raise_error(AWS_IO_SOCKET_ILLEGAL_OPERATION_FOR_STATE);
}
int error_code = listen(socket->io_handle.data.fd, backlog_size);
if (!error_code) {
AWS_LOGF_INFO(
AWS_LS_IO_SOCKET, "id=%p fd=%d: successfully listening", (void *)socket, socket->io_handle.data.fd);
socket->state = LISTENING;
return AWS_OP_SUCCESS;
}
int errno_value = errno; /* Always cache errno before potential side-effect */
AWS_LOGF_ERROR(
AWS_LS_IO_SOCKET,
"id=%p fd=%d: listen failed with error code %d",
(void *)socket,
socket->io_handle.data.fd,
errno_value);
socket->state = ERROR;
return aws_raise_error(s_determine_socket_error(errno_value));
}
/* this is called by the event loop handler that was installed in start_accept(). It runs once the FD goes readable,
* accepts as many as it can and then returns control to the event loop. */
static void s_socket_accept_event(
struct aws_event_loop *event_loop,
struct aws_io_handle *handle,
int events,
void *user_data) {
(void)event_loop;
struct aws_socket *socket = user_data;
struct posix_socket *socket_impl = socket->impl;
AWS_LOGF_DEBUG(
AWS_LS_IO_SOCKET, "id=%p fd=%d: listening event received", (void *)socket, socket->io_handle.data.fd);
if (socket_impl->continue_accept && events & AWS_IO_EVENT_TYPE_READABLE) {
int in_fd = 0;
while (socket_impl->continue_accept && in_fd != -1) {
struct sockaddr_storage in_addr;
socklen_t in_len = sizeof(struct sockaddr_storage);
in_fd = accept(handle->data.fd, (struct sockaddr *)&in_addr, &in_len);
if (in_fd == -1) {
int errno_value = errno; /* Always cache errno before potential side-effect */
if (errno_value == EAGAIN || errno_value == EWOULDBLOCK) {
break;
}
int aws_error = aws_socket_get_error(socket);
aws_raise_error(aws_error);
s_on_connection_error(socket, aws_error);
break;
}
AWS_LOGF_DEBUG(
AWS_LS_IO_SOCKET, "id=%p fd=%d: incoming connection", (void *)socket, socket->io_handle.data.fd);
struct aws_socket *new_sock = aws_mem_acquire(socket->allocator, sizeof(struct aws_socket));
if (!new_sock) {
close(in_fd);
s_on_connection_error(socket, aws_last_error());
continue;
}
if (s_socket_init(new_sock, socket->allocator, &socket->options, in_fd)) {
aws_mem_release(socket->allocator, new_sock);
s_on_connection_error(socket, aws_last_error());
continue;
}
new_sock->local_endpoint = socket->local_endpoint;
new_sock->state = CONNECTED_READ | CONNECTED_WRITE;
uint16_t port = 0;