CODEWITHSUNDEEP
iosswiftsocketsportasyncsocket
saravanar
saravanar

Reputation: 649

iOS Swift: How to check if port is open

In my application want to check port is open or not. Here refer this link

iOS SDK: How can I check if a port is open?

But dnt get any solution. And also refer these two github source,

https://github.com/swiftsocket/SwiftSocket

https://github.com/robbiehanson/CocoaAsyncSocket

But dnt any solution. Any one help how check port is open or not. Thanks Advance.

Upvotes: 1

Views: 4686

Answers (2)

bedalton
bedalton

Reputation: 117

I cannot add comments, so I am adding this as a separate answer. I followed Surani's answer, but encountered errors when using the port later in the application. I found I had to manually close the socket before returning the response.

So I modified the last 4 lines to

    let isOpen = listen(socketFileDescriptor, SOMAXCONN ) != -1
    Darwin.close(socketFileDescriptor)
    return isOpen

Here is the revised version of Surani's answer with the socket closing code

func isPortOpen(port: in_port_t) -> Bool {

    let socketFileDescriptor = socket(AF_INET, SOCK_STREAM, 0)
    if socketFileDescriptor == -1 {
        return false
    }

    var addr = sockaddr_in()
    let sizeOfSockkAddr = MemoryLayout<sockaddr_in>.size
    addr.sin_len = __uint8_t(sizeOfSockkAddr)
    addr.sin_family = sa_family_t(AF_INET)
    addr.sin_port = Int(OSHostByteOrder()) == OSLittleEndian ? _OSSwapInt16(port) : port
    addr.sin_addr = in_addr(s_addr: inet_addr("0.0.0.0"))
    addr.sin_zero = (0, 0, 0, 0, 0, 0, 0, 0)
    var bind_addr = sockaddr()
    memcpy(&bind_addr, &addr, Int(sizeOfSockkAddr))

    if Darwin.bind(socketFileDescriptor, &bind_addr, socklen_t(sizeOfSockkAddr)) == -1 {
        return false
    }
    let isOpen = listen(socketFileDescriptor, SOMAXCONN ) != -1
    Darwin.close(socketFileDescriptor)
    return isOpen
}

Use like:

let port = UInt16(10000)
print(isPortOpen(port:port))

Upvotes: 3

Hitesh Surani
Hitesh Surani

Reputation: 13567

Please use the below method to port is open or not

func isPortOpen(port: in_port_t) -> Bool {

    let socketFileDescriptor = socket(AF_INET, SOCK_STREAM, 0)
    if socketFileDescriptor == -1 {
        return false
    }

    var addr = sockaddr_in()
    let sizeOfSockkAddr = MemoryLayout<sockaddr_in>.size
    addr.sin_len = __uint8_t(sizeOfSockkAddr)
    addr.sin_family = sa_family_t(AF_INET)
    addr.sin_port = Int(OSHostByteOrder()) == OSLittleEndian ? _OSSwapInt16(port) : port
    addr.sin_addr = in_addr(s_addr: inet_addr("0.0.0.0"))
    addr.sin_zero = (0, 0, 0, 0, 0, 0, 0, 0)
    var bind_addr = sockaddr()
    memcpy(&bind_addr, &addr, Int(sizeOfSockkAddr))

    if Darwin.bind(socketFileDescriptor, &bind_addr, socklen_t(sizeOfSockkAddr)) == -1 {
        return false
    }
    if listen(socketFileDescriptor, SOMAXCONN ) == -1 {
        return false
    }
    return true
}

Use like:

let port = UInt16(10000)
print(isPortOpen(port:port))

Upvotes: 5

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