32 lines
915 B
Go
32 lines
915 B
Go
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package params
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import (
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"fmt"
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"net"
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"strings"
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)
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// GetOutboundSubnets obtains the CIDR subnets from the comma separated list of the
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// environment variable FIREWALL_OUTBOUND_SUBNETS.
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func (r *reader) GetOutboundSubnets() (outboundSubnets []net.IPNet, err error) {
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const key = "FIREWALL_OUTBOUND_SUBNETS"
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s, err := r.envParams.GetEnv(key)
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if err != nil {
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return nil, err
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} else if s == "" {
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return nil, nil
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}
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subnets := strings.Split(s, ",")
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for _, subnet := range subnets {
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_, cidr, err := net.ParseCIDR(subnet)
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if err != nil {
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return nil, fmt.Errorf("cannot parse outbound subnet %q from environment variable with key %s: %w", subnet, key, err)
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} else if cidr == nil {
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return nil, fmt.Errorf("cannot parse outbound subnet %q from environment variable with key %s: subnet is nil",
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subnet, key)
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}
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outboundSubnets = append(outboundSubnets, *cidr)
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}
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return outboundSubnets, nil
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}
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