iOS Swift: How to check if port is open - ios

Question

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.

Answer 1

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))

Answer 2

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))