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45 lines
1.3 KiB
V
45 lines
1.3 KiB
V
module net
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// validate_port checks whether a port is valid and returns the port or an error.
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// The valid ports numbers are between 0 and 0xFFFF.
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// For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port
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// is optional and a value of zero means no port.
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// See also https://en.wikipedia.org/wiki/Port_%28computer_networking%29 .
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pub fn validate_port(port int) !u16 {
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if port >= 0 && port <= 0xFFFF {
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return u16(port)
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} else {
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return err_port_out_of_range
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}
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}
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// split_address splits an address into its host name and its port
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pub fn split_address(addr string) !(string, u16) {
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if _ := addr.index(']') {
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// ipv6 brackets
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address := addr.all_after('[').all_before_last(']')
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port := addr.all_after_last(']:').int()
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p := validate_port(port)!
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return address, p
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} else if _ := addr.index('::') {
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if addr.count(':') == 2 && addr.all_before_last('::') == '' {
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// ipv6 host only `::1`
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return addr, 0
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} else {
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// addr:port, or `::addr:port`
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address := addr.all_before_last(':')
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port := addr.all_after_last(':').int()
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p := validate_port(port)!
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return address, p
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}
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} else if _ := addr.index(':') {
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// addr:port
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address := addr.all_before_last(':')
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p := validate_port(addr.all_after_last(':').int())!
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return address, p
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} else {
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// addr only
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return addr, 0
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}
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}
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