332 lines
11 KiB
Objective-C
Executable File
332 lines
11 KiB
Objective-C
Executable File
//
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// GDUnixSocketServer.m
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//
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// Copyright © 2016 Alexey Gordiyenko. All rights reserved.
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//
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/*
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The MIT License (MIT)
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Copyright (c) 2016 A. Gordiyenko
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#import "GDUnixSocketServer.h"
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#import "GDUnixSocket_Private.h"
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#include <stdio.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/stat.h>
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const int kGDUnixSocketServerMaxConnectionsDefault = 5;
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@interface GDUnixSocketServer ()
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@property (nonatomic, readonly, strong) NSLock *closeLock;
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@property (nonatomic, readonly, strong) NSMutableDictionary *connectedClients;
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@end
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@implementation GDUnixSocketServer
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#pragma mark - Public Methods
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- (BOOL)listenWithError:(NSError **)error {
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return [self listenWithMaxConnections:0 error:error];
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}
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- (BOOL)listenWithMaxConnections:(int)maxConnections error:(NSError **)error {
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BOOL(^failureDeferBlock)(NSError *) = ^BOOL(NSError *retError) {
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if (error) {
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*error = retError;
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}
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return NO;
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};
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dispatch_fd_t socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
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[self setFd:socket_fd];
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if (socket_fd == kGDBadSocketFD) {
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return failureDeferBlock([NSError gduds_errorForCode:GDUnixSocketErrorBadSocket info:[self lastErrorInfo]]);
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}
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const char *socket_path = [self.socketPath cStringUsingEncoding:NSUTF8StringEncoding];
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struct sockaddr_un address = {};
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address.sun_family = AF_UNIX;
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strncpy(address.sun_path, socket_path, sizeof(address.sun_path) - 1);
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if (0 != strcmp(address.sun_path, socket_path)) {
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[self closeSilently];
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return failureDeferBlock([NSError gduds_errorForCode:GDUnixSocketErrorListen info:@"The socket path is inconsistent"]);
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}
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socket_path = address.sun_path;
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[self unlinkSocket:socket_path];
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if (0 != bind(socket_fd, (struct sockaddr *)&address, sizeof(struct sockaddr_un))) {
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[self closeSilently];
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return failureDeferBlock([NSError gduds_errorForCode:GDUnixSocketErrorBind info:[self lastErrorInfo]]);
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}
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if (0 != listen(socket_fd, maxConnections ?: kGDUnixSocketServerMaxConnectionsDefault)) {
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[self closeSilently];
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return failureDeferBlock([NSError gduds_errorForCode:GDUnixSocketErrorListen info:[self lastErrorInfo]]);
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}
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if (error) {
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*error = nil;
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}
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__weak typeof(self) weakSelf = self;
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.001 * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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[weakSelf mainLoop];
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});
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self.state = GDUnixSocketStateListening;
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if ([self.delegate respondsToSelector:@selector(unixSocketServerDidStartListening:)]) {
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[self.delegate unixSocketServerDidStartListening:self];
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}
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return YES;
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}
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- (ssize_t)sendData:(NSData *)data toClientWithID:(NSString *)clientID error:(NSError **)error {
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@synchronized(self) {
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if (error) {
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*error = nil;
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}
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GDUnixSocket *client = self.connectedClients[clientID];
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if (!client) {
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if (error) {
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*error = [NSError gduds_errorForCode:GDUnixSocketErrorUnknownClient info:[NSString stringWithFormat:@"Client ID: %@", clientID]];
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}
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return -1;
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}
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return [client writeData:data error:error];
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}
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}
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- (void)sendData:(NSData *)data toClientWithID:(NSString *)clientID completion:(void(^)(NSError *error, ssize_t size))completion {
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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NSError *error = nil;
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ssize_t size = [self sendData:data toClientWithID:clientID error:&error];
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if (completion) {
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completion(error, size);
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}
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});
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}
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#pragma mark - Overrides
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- (ssize_t)writeData:(NSData *)data error:(NSError **)error {
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if (error) {
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*error = nil;
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}
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return 0;
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}
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- (BOOL)closeWithError:(NSError **)error {
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return [self closeWithError:error informDelegate:YES];
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}
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- (BOOL)closeSilently {
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return [self closeWithError:nil informDelegate:NO];
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}
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- (BOOL)closeWithError:(NSError **)error informDelegate:(BOOL)informDelegate {
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BOOL retVal = NO;
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// First, close all active clients.
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[self removeAllClients];
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// Then close the listening socket.
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[self.closeLock lock];
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NSError *retError = [self unlinkSocket];
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if (!retError) {
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retVal = [super closeWithError:&retError];
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}
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if (informDelegate && [self.delegate respondsToSelector:@selector(unixSocketServerDidClose:error:)]) {
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[self.delegate unixSocketServerDidClose:self error:retError];
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}
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[self.closeLock unlock];
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if (error) {
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*error = retError;
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}
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return retVal;
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}
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#pragma mark - Private Methods
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- (void)readOnConnection:(GDUnixSocket *)clientConnection {
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NSError *error;
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do {
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if (![self clientExists:clientConnection]) {
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break;
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}
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NSData *data = [clientConnection readWithError:&error];
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if (!data) {
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if ([self clientExists:clientConnection]) {
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if (error) {
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if ([self.delegate respondsToSelector:@selector(unixSocketServer:didFailToReadForClientID:error:)]) {
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[self.delegate unixSocketServer:self didFailToReadForClientID:clientConnection.uniqueID error:error];
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}
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} else {
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if ([self.delegate respondsToSelector:@selector(unixSocketServer:clientWithIDDidDisconnect:)]) {
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[self.delegate unixSocketServer:self clientWithIDDidDisconnect:clientConnection.uniqueID];
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}
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}
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[self removeAndCloseClient:clientConnection];
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}
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} else {
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if ([self.delegate respondsToSelector:@selector(unixSocketServer:didReceiveData:fromClientWithID:)]) {
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[self.delegate unixSocketServer:self didReceiveData:data fromClientWithID:clientConnection.uniqueID];
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}
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}
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} while (!error);
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}
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- (void)mainLoop {
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while (true) {
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dispatch_fd_t socket_fd = [self fd];
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if (socket_fd == kGDBadSocketFD) {
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break;
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}
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struct sockaddr_un connection_addr = {};
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socklen_t connection_addr_len;
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dispatch_fd_t connection_fd = accept(socket_fd, (struct sockaddr *)&connection_addr, &connection_addr_len);
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if (connection_fd == kGDBadSocketFD) {
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[self.closeLock lock];
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if ([self fd] != kGDBadSocketFD) {
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// If accept failed, that means some error happened. Close listening socket.
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if ([self.delegate respondsToSelector:@selector(unixSocketServerDidFailToAcceptConnection:error:)]) {
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NSError *error = [NSError gduds_errorForCode:GDUnixSocketErrorAccept info:[self lastErrorInfo]];
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[self.delegate unixSocketServerDidFailToAcceptConnection:self error:error];
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}
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[self.closeLock unlock];
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[self close];
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} else {
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[self.closeLock unlock];
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}
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break;
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} else {
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GDUnixSocket *newConnection = [[GDUnixSocket alloc] initWithSocketPath:kGDDummySocketPath];
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[newConnection setFd:connection_fd];
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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[self readOnConnection:newConnection];
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});
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[self addClient:newConnection];
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if ([self.delegate respondsToSelector:@selector(unixSocketServer:didAcceptClientWithID:)]) {
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[self.delegate unixSocketServer:self didAcceptClientWithID:newConnection.uniqueID];
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}
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}
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}
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}
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- (NSError *)unlinkSocket {
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return [self unlinkSocket:[self.socketPath cStringUsingEncoding:NSUTF8StringEncoding]];
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}
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- (NSError *)unlinkSocket:(const char *)socketPath {
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int status;
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struct stat st;
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status = stat(socketPath, &st);
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if (status == 0) {
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// A file already exists. Check if this file is a socket node. If yes: unlink it.
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if ((st.st_mode & S_IFMT) == S_IFSOCK) {
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if (0 != unlink(socketPath)) {
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return [NSError gduds_errorForCode:GDUnixSocketErrorUnlink info:[self lastErrorInfo]];
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}
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}
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}
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return nil;
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}
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#pragma mark - Clients Related
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- (void)addClient:(GDUnixSocket *)client {
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@synchronized(self) {
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if (!client) {
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[NSException raise:NSInternalInconsistencyException format:@"Cannot add empty client"];
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}
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self.connectedClients[client.uniqueID] = client;
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}
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}
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- (BOOL)clientExists:(GDUnixSocket *)client {
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@synchronized(self) {
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return self.connectedClients[client.uniqueID] != nil;
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}
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}
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- (NSError *)removeAndCloseClient:(GDUnixSocket *)client {
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if ([self clientExists:client]) {
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@synchronized(self) {
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[self.connectedClients removeObjectForKey:client.uniqueID];
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NSError *error = nil;
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[client closeWithError:&error];
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return error;
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}
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}
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return nil;
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}
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- (void)removeAllClients {
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@synchronized(self) {
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for (GDUnixSocket *client in self.connectedClients.allValues) {
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[client close];
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}
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[self.connectedClients removeAllObjects];
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}
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}
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#pragma mark - Life Cycle
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- (instancetype)initWithSocketPath:(NSString *)socketPath andFragmentSize:(size_t)fragmentSize {
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self = [super initWithSocketPath:socketPath andFragmentSize:fragmentSize];
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if (self) {
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_closeLock = [NSLock new];
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_connectedClients = [NSMutableDictionary new];
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}
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return self;
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}
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@end
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