16990665124

Committed 15 Aug 2025 01:10PM UTC coverage: 66.74% (-0.03%) from 66.765%

Build # 16990665124

Build Type

Pull #9455

github

Committed by

web-flow

Commit Message

Merge 035fac41d into fb1adfc21

Pull Request Pull Request #9455: [1/2] discovery+lnwire: add support for DNS host name in NodeAnnouncement msg

Run Details

116 of 188 new or added lines in 8 files covered. (61.7%)

110 existing lines in 23 files now uncovered.

136011 of 203791 relevant lines covered (66.74%)

21482.89 hits per line

Source File
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90.32

/lnwire/dns_addr.go

package lnwire

import (
        "errors"
        "fmt"
        "net"
        "strconv"
)

// ErrEmptyDNSHostname is returned when a DNS hostname is empty.
var ErrEmptyDNSHostname = errors.New("hostname cannot be empty")

// ErrZeroPort is returned when a DNS port is zero.
var ErrZeroPort = errors.New("port cannot be zero")

// DNSAddress is used to represent a DNS address of a node.
type DNSAddress struct {
        // Hostname is the DNS hostname of the address. This MUST only contain
        // ASCII characters as per Bolt #7. The maximum length that this may
        // be is 255 bytes.
        Hostname string

        // Port is the port number of the address.
        Port uint16
}

// A compile-time check to ensure that DNSAddress implements the net.Addr
// interface.
var _ net.Addr = (*DNSAddress)(nil)

// Network returns the network that this address uses, which is "tcp".
func (d *DNSAddress) Network() string {
        return "tcp"
}

// String returns the address in the form "hostname:port".
func (d *DNSAddress) String() string {
        return net.JoinHostPort(d.Hostname, strconv.Itoa(int(d.Port)))
}

// ValidateDNSAddr validates that the DNS hostname is not empty and contains
// only ASCII characters and of max length 255 characters and port is non zero
// according to BOLT #7.
func ValidateDNSAddr(hostname string, port uint16) error {
        if hostname == "" {
                return ErrEmptyDNSHostname
        }

        // Per BOLT 7, ports must not be zero for type 5 address (DNS address).
        if port == 0 {
                return ErrZeroPort
        }

        if len(hostname) > 255 {
                return fmt.Errorf("DNS hostname length %d, exceeds limit of "+
                        "255 bytes", len(hostname))
        }

        // Check if hostname contains only ASCII characters.
        for i, r := range hostname {
                // Check for valid hostname characters, excluding ASCII control
                // characters (0-31), spaces, underscores, delete character
                // (127), and the special characters (like /, \, @, #, $, etc.).
                if !((r >= 'a' && r <= 'z') ||
                        (r >= 'A' && r <= 'Z') ||
                        (r >= '0' && r <= '9') ||
                        r == '-' ||
                        r == '.') {

                        return fmt.Errorf("hostname '%s' contains invalid "+
                                "character '%c' at position %d", hostname, r, i)
                }
        }

        return nil
}

1	package lnwire
2
3	import (
4	"errors"
5	"fmt"
6	"net"
7	"strconv"
8	)
9
10	// ErrEmptyDNSHostname is returned when a DNS hostname is empty.
11	var ErrEmptyDNSHostname = errors.New("hostname cannot be empty")
12
13	// ErrZeroPort is returned when a DNS port is zero.
14	var ErrZeroPort = errors.New("port cannot be zero")
15
16	// DNSAddress is used to represent a DNS address of a node.
17	type DNSAddress struct {
18	// Hostname is the DNS hostname of the address. This MUST only contain
19	// ASCII characters as per Bolt #7. The maximum length that this may
20	// be is 255 bytes.
21	Hostname string
22
23	// Port is the port number of the address.
24	Port uint16
25	}
26
27	// A compile-time check to ensure that DNSAddress implements the net.Addr
28	// interface.
29	var _ net.Addr = (*DNSAddress)(nil)
30
31	// Network returns the network that this address uses, which is "tcp".
NEW 32	func (d *DNSAddress) Network() string {	×
NEW 33	return "tcp"	×
NEW 34	}	×
35
36	// String returns the address in the form "hostname:port".
37	func (d *DNSAddress) String() string {	44✔
38	return net.JoinHostPort(d.Hostname, strconv.Itoa(int(d.Port)))	44✔
39	}	44✔
40
41	// ValidateDNSAddr validates that the DNS hostname is not empty and contains
42	// only ASCII characters and of max length 255 characters and port is non zero
43	// according to BOLT #7.
44	func ValidateDNSAddr(hostname string, port uint16) error {	9✔
45	if hostname == "" {	10✔
46	return ErrEmptyDNSHostname	1✔
47	}	1✔
48
49	// Per BOLT 7, ports must not be zero for type 5 address (DNS address).
50	if port == 0 {	9✔
51	return ErrZeroPort	1✔
52	}	1✔
53
54	if len(hostname) > 255 {	8✔
55	return fmt.Errorf("DNS hostname length %d, exceeds limit of "+	1✔
56	"255 bytes", len(hostname))	1✔
57	}	1✔
58
59	// Check if hostname contains only ASCII characters.
60	for i, r := range hostname {	82✔
61	// Check for valid hostname characters, excluding ASCII control	76✔
62	// characters (0-31), spaces, underscores, delete character	76✔
63	// (127), and the special characters (like /, \, @, #, $, etc.).	76✔
64	if !((r >= 'a' && r <= 'z') \|\|	76✔
65	(r >= 'A' && r <= 'Z') \|\|	76✔
66	(r >= '0' && r <= '9') \|\|	76✔
67	r == '-' \|\|	76✔
68	r == '.') {	79✔
69		3✔
70	return fmt.Errorf("hostname '%s' contains invalid "+	3✔
71	"character '%c' at position %d", hostname, r, i)	3✔
72	}	3✔
73	}
74
75	return nil	3✔
76	}

lightningnetwork / lnd / 16990665124

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