Function format_ip_address

crates/stdlib/src/ssl/cert.rs:159–191

Format IP address (IPv4 or IPv6) to string Formats raw IP address bytes according to standard notation: - IPv4: dotted decimal (e.g., "192.0.2.1") - IPv6: colon-separated hex (e.g., "2001:DB8:0:0:0:0:0:1")

(ip: &[u8])

/// - IPv4: dotted decimal (e.g., "192.0.2.1")
/// - IPv6: colon-separated hex (e.g., "2001:DB8:0:0:0:0:0:1")
fn format_ip_address(ip: &[u8]) -> String {
    if ip.len() == 4 {
        // IPv4
        format!("{}.{}.{}.{}", ip[0], ip[1], ip[2], ip[3])
    } else if ip.len() == 16 {
        // IPv6 - format in full form without compression (uppercase)
        // CPython returns IPv6 in full form: 2001:DB8:0:0:0:0:0:1 (not 2001:db8::1)
        let segments = [
            u16::from_be_bytes([ip[0], ip[1]]),
            u16::from_be_bytes([ip[2], ip[3]]),
            u16::from_be_bytes([ip[4], ip[5]]),
            u16::from_be_bytes([ip[6], ip[7]]),
            u16::from_be_bytes([ip[8], ip[9]]),
            u16::from_be_bytes([ip[10], ip[11]]),
            u16::from_be_bytes([ip[12], ip[13]]),
            u16::from_be_bytes([ip[14], ip[15]]),
        ];
        format!(
            "{:X}:{:X}:{:X}:{:X}:{:X}:{:X}:{:X}:{:X}",
            segments[0],
            segments[1],
            segments[2],
            segments[3],
            segments[4],
            segments[5],
            segments[6],
            segments[7]
        )
    } else {
        // Unknown format - return as debug string
        format!("{ip:?}")
    }
}

/// Format ASN.1 time to string
///