我正在尝试使用 Swift将安全传输与 BSD 套接字一起使用。看起来它应该足够简单，但我无法让它工作，而且关于这个主题的文档很少。
我将我的问题归结为一个简单的“Socket”类，我（据我所知）在其中满足了安全传输的要求。
import Cocoa
class Socket: NSObject {
private let hello = "Hello!"
private var socketfd: Int32
private var sock_addr: sockaddr
private var sslContext: SSLContext?
var sslWriteCallbackFunc: SSLWriteFunc {
get {
let ump = UnsafeMutablePointer<((SSLConnectionRef, UnsafePointer<Void>,
UnsafeMutablePointer<Int>) -> OSStatus)>.alloc(1)
ump.initialize(sslWriteCallback)
return CFunctionPointer<((SSLConnectionRef, UnsafePointer<Void>,
UnsafeMutablePointer<Int>) -> OSStatus)>(COpaquePointer(ump))
}
}
var sslReadCallbackFunc: SSLReadFunc {
get {
let ump = UnsafeMutablePointer<((SSLConnectionRef, UnsafeMutablePointer<Void>,
UnsafeMutablePointer<Int>) -> OSStatus)>.alloc(1)
ump.initialize(sslReadCallback)
return CFunctionPointer<((SSLConnectionRef, UnsafeMutablePointer<Void>,
UnsafeMutablePointer<Int>) -> OSStatus)>(COpaquePointer(ump))
}
}
init(address: String, port: UInt16) {
socketfd = Darwin.socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
var addr = Darwin.sockaddr_in(sin_len: __uint8_t(sizeof(sockaddr_in)), sin_family: sa_family_t(AF_INET), sin_port: CFSwapInt16(port), sin_addr: in_addr(s_addr: inet_addr(address)), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
sock_addr = Darwin.sockaddr(sa_len: 0, sa_family: 0, sa_data: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
Darwin.memcpy(&sock_addr, &addr, Int(sizeof(sockaddr_in)))
super.init()
}
func connect() -> Socket {
let err = Darwin.connect(socketfd, &sock_addr, socklen_t(sizeof(sockaddr_in)))
return self
}
func makeSecure() -> Socket {
if let umc = SSLCreateContext(nil, kSSLClientSide, kSSLStreamType) {
sslContext = umc.takeRetainedValue()
var status = SSLSetIOFuncs(sslContext!, sslReadCallbackFunc, sslWriteCallbackFunc)
status = SSLSetConnection(sslContext!, &socketfd)
SSLHandshake(sslContext!)
}
return self
}
func sendHello() -> Socket {
let bytes = [UInt8](hello.utf8)
let data = NSData(bytes: bytes, length: bytes.count)
let test = UnsafeMutablePointer<Int>.alloc(1)
test.initialize(bytes.count)
self.sslWriteCallback(&socketfd, data: data.bytes, dataLength: test)
return self
}
// MARK: - SSL Callback Methods
func sslReadCallback(connection: SSLConnectionRef,
data: UnsafeMutablePointer<Void>,
dataLength: UnsafeMutablePointer<Int>) -> OSStatus {
let bytesRead = read(socketfd, data, UnsafePointer<Int>(dataLength).memory)
return noErr
}
func sslWriteCallback(connection: SSLConnectionRef,
data: UnsafePointer<Void>,
dataLength: UnsafeMutablePointer<Int>) -> OSStatus {
let sent = Darwin.sendto(socketfd, data, UnsafePointer<Int>(dataLength).memory, 0, &sock_addr, socklen_t(sizeof(sockaddr_in)))
if (sent < 0) {
let error = NSError(domain: NSPOSIXErrorDomain, code: Int(errno), userInfo: nil)
println(error.localizedDescription)
} else {
println("Sent \(sent) bytes (\(hello))")
}
return noErr
}
}
我通过制作一个简单的实例测试了非 TLS 套接字通信：
let socket = Socket(address: "some-ip-address", port: 8080)
socket.connect().sendHello()
并使用 netcat 在目标机器上运行 echo 服务器。这工作正常。
nc -l -p 8080
尝试在安全传输的 TLS 中包装套接字（调用 makeSecure() 方法）在调用 SSLHandshake(...) 时崩溃，并出现 EXC_BAD_ADDRESS(code=2, address=...) 错误。有人对我在这里缺少什么有任何指示吗？
编辑
我可以看到控制台输出：
04/06/15 09:20:48,000 kernel[0]: Data/Stack execution not permitted: TheProject[pid 29184] at virtual address 0x100602000, protections were read-write
编辑 2
我让它在 Xcode 7 beta 中与 Swift 2 一起工作。见下文。