From 8cd9ecb425074ddbdf628adb307ac979362cc4ef Mon Sep 17 00:00:00 2001 From: Beau Gunderson Date: Sun, 9 Aug 2026 21:56:58 -0700 Subject: [PATCH] Honor the fromURL graceful-failure contract for non-IPv6 hosts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Address6.fromURL() is documented and typed to return `{ error, address: null, port: null }` when a URL can't be parsed, but that contract was only implemented on the regex-miss path. The URL host character class `[0-9a-f:.]` is a superset of valid IPv6, so any host made only of hex digits, colons and dots matched the regex and was handed straight to `new Address6(host)`, whose AddressError propagated out uncaught. IPv4 literals are the visible case — `http://127.0.0.1/`, `http://169.254.169.254/`, `http://0.0.0.0/` all threw — but so did `[:::]`, `[1:2:3:4:5:6:7:8:9]` and `[::ffff:999.1.1.1]`. A plain hostname like `example.com` avoided the throw only because letters outside a-f break the regex match first. Catch the constructor and return the same error object the regex-miss path returns, so the function never throws for any input. Reported by @zikk090 via GHSA-mxvh-v779-f36j. Declining that as a security advisory: an uncaught synchronous throw from a parser on the caller's own stack is a correctness bug, not a denial of service. --- README.md | 126 +++++++++++++++++----------------- src/ipv6.ts | 31 +++++---- test/functionality-v6-test.ts | 69 +++++++++++++++++++ 3 files changed, 149 insertions(+), 77 deletions(-) diff --git a/README.md b/README.md index e4c7879..e947aac 100644 --- a/README.md +++ b/README.md @@ -175,69 +175,69 @@ A few terms used throughout the API can be confusing if you haven't worked deepl - `static isValid(address: string): boolean` — Returns true if the given string is a valid IPv6 address (with optional CIDR subnet and zone identifier), false otherwise. Host bits in the subnet portion are allowed (e.g. `2001:db8::1/32` is valid); for strict network-address validation compare `correctForm()` to `startAddress().correctForm()`, or use `networkForm()`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L167) - `static fromBigInt(bigInt: bigint): Address6` — Convert a BigInt to a v6 address object. The value must be in the range `[0, 2**128 - 1]`; otherwise `AddressError` is thrown. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L188) - `static fromURL(url: string): { error: string; address: null; port: null } | { error?: undefined; address: Address6; port: number | null }` — Parse a URL (with optional bracketed host and port) into an address and port. Returns either `{ address, port }` on success or `{ error, address: null, port: null }` if the URL could not be parsed. Ports are returned as numbers (or `null` if absent or out of range). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L213) -- `static fromAddressAndMask(address: string, mask: string): Address6` — Construct an `Address6` from an address and a hex subnet mask given as separate strings (e.g. as returned by Node's `os.networkInterfaces()`). Throws `AddressError` if the mask is non-contiguous (e.g. `ffff::ffff`). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L277) -- `static fromAddressAndWildcardMask(address: string, wildcardMask: string): Address6` — Construct an `Address6` from an address and a Cisco-style wildcard mask given as separate strings (e.g. `::ffff:ffff:ffff:ffff` for a `/64`). The wildcard mask is the bitwise inverse of the subnet mask. Throws `AddressError` if the mask is non-contiguous. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L291) -- `static fromWildcard(input: string): Address6` — Construct an `Address6` from a wildcard pattern with trailing `*` groups. The number of trailing wildcards determines the prefix length: each `*` represents 16 bits. `::` is expanded to zero groups (not wildcards) before evaluating trailing wildcards. Only trailing whole-group wildcards are supported. Partial-group wildcards (e.g. `2001:db8::0*`) and interior wildcards (e.g. `*::1`) throw `AddressError`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L313) -- `static fromAddress4(address: string): Address6` — Create an IPv6-mapped address given an IPv4 address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L374) -- `static fromArpa(arpaFormAddress: string): Address6` — Return an address from ip6.arpa form [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L390) -- `static fromAddress4Nat64(address: string, prefix: string): Address6` — Embed an IPv4 address into a NAT64 IPv6 address using the encoding defined by [RFC 6052](https://datatracker.ietf.org/doc/html/rfc6052). The default prefix is the well-known prefix `64:ff9b::/96`. The prefix length must be one of 32, 40, 48, 56, 64, or 96; for prefixes shorter than /64 the IPv4 octets are split around the reserved bits 64–71. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1060) -- `static fromByteArray(bytes: number[]): Address6` — Convert a byte array to an Address6 object. Accepts unsigned bytes (0 to 255) or signed bytes (-128 to 127, as an `Int8Array` or a Java `byte[]` holds them), folding signed values to their unsigned equivalent. Throws `AddressError` unless given exactly 16 integers from -128 to 255. To convert from a Node.js `Buffer`, spread it: `Address6.fromByteArray([...buf])`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1175) -- `static fromUnsignedByteArray(bytes: number[]): Address6` — Convert an unsigned byte array to an Address6 object. Throws `AddressError` unless given exactly 16 integers from 0 to 255. To convert from a Node.js `Buffer`, spread it: `Address6.fromUnsignedByteArray([...buf])`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1192) +- `static fromAddressAndMask(address: string, mask: string): Address6` — Construct an `Address6` from an address and a hex subnet mask given as separate strings (e.g. as returned by Node's `os.networkInterfaces()`). Throws `AddressError` if the mask is non-contiguous (e.g. `ffff::ffff`). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L280) +- `static fromAddressAndWildcardMask(address: string, wildcardMask: string): Address6` — Construct an `Address6` from an address and a Cisco-style wildcard mask given as separate strings (e.g. `::ffff:ffff:ffff:ffff` for a `/64`). The wildcard mask is the bitwise inverse of the subnet mask. Throws `AddressError` if the mask is non-contiguous. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L294) +- `static fromWildcard(input: string): Address6` — Construct an `Address6` from a wildcard pattern with trailing `*` groups. The number of trailing wildcards determines the prefix length: each `*` represents 16 bits. `::` is expanded to zero groups (not wildcards) before evaluating trailing wildcards. Only trailing whole-group wildcards are supported. Partial-group wildcards (e.g. `2001:db8::0*`) and interior wildcards (e.g. `*::1`) throw `AddressError`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L316) +- `static fromAddress4(address: string): Address6` — Create an IPv6-mapped address given an IPv4 address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L377) +- `static fromArpa(arpaFormAddress: string): Address6` — Return an address from ip6.arpa form [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L393) +- `static fromAddress4Nat64(address: string, prefix: string): Address6` — Embed an IPv4 address into a NAT64 IPv6 address using the encoding defined by [RFC 6052](https://datatracker.ietf.org/doc/html/rfc6052). The default prefix is the well-known prefix `64:ff9b::/96`. The prefix length must be one of 32, 40, 48, 56, 64, or 96; for prefixes shorter than /64 the IPv4 octets are split around the reserved bits 64–71. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1063) +- `static fromByteArray(bytes: number[]): Address6` — Convert a byte array to an Address6 object. Accepts unsigned bytes (0 to 255) or signed bytes (-128 to 127, as an `Int8Array` or a Java `byte[]` holds them), folding signed values to their unsigned equivalent. Throws `AddressError` unless given exactly 16 integers from -128 to 255. To convert from a Node.js `Buffer`, spread it: `Address6.fromByteArray([...buf])`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1178) +- `static fromUnsignedByteArray(bytes: number[]): Address6` — Convert an unsigned byte array to an Address6 object. Throws `AddressError` unless given exactly 16 integers from 0 to 255. To convert from a Node.js `Buffer`, spread it: `Address6.fromUnsignedByteArray([...buf])`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1195) **Instance methods** -- `microsoftTranscription(): string` — Return the Microsoft UNC transcription of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L416) -- `mask(mask?: number): string` — Return the first n bits of the address, defaulting to the subnet mask [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L425) -- `possibleSubnets(subnetSize?: number): string` — Return the number of possible subnets of a given size in the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L435) -- `startAddress(): Address6` — The first address in the range given by this address' subnet Often referred to as the Network Address. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L460) -- `startAddressExclusive(): Address6` — The first host address in the range given by this address's subnet ie the first address after the Network Address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L469) -- `endAddress(): Address6` — The last address in the range given by this address' subnet Often referred to as the Broadcast [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L487) -- `endAddressExclusive(): Address6` — The last host address in the range given by this address's subnet ie the last address prior to the Broadcast Address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L496) -- `subnetMaskAddress(): Address6` — The hex form of the subnet mask, e.g. `ffff:ffff:ffff:ffff::` for a `/64`. Returns an `Address6`; call `.correctForm()` for the string. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L506) -- `wildcardMask(): Address6` — The Cisco-style wildcard mask, e.g. `::ffff:ffff:ffff:ffff` for a `/64`. This is the bitwise inverse of `subnetMaskAddress()`. Returns an `Address6`; call `.correctForm()` for the string. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L518) -- `networkForm(): string` — The network address in CIDR string form, e.g. `2001:db8::/32` for `2001:db8::1/32`. For an address with no explicit subnet the prefix is `/128`, e.g. `networkForm()` on `2001:db8::1` returns `2001:db8::1/128`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L531) -- `getScope(): string` — Return the scope of the address. The 4-bit scope field ([RFC 4291 §2.7](https://datatracker.ietf.org/doc/html/rfc4291#section-2.7)) is only defined for multicast addresses; for unicast addresses the scope is derived from the address type per [RFC 4007 §6](https://datatracker.ietf.org/doc/html/rfc4007#section-6). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L543) -- `getType(): string` — Return the type of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L570) -- `getBits(start: number, end: number): bigint` — Return the bits in the given range as a BigInt [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L585) -- `getBitsBase2(start: number, end: number): string` — Return the bits in the given range as a base-2 string [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L593) -- `getBitsBase16(start: number, end: number): string` — Return the bits in the given range as a base-16 string [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L601) -- `getBitsPastSubnet(): string` — Return the bits that are set past the subnet mask length [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L617) -- `reverseForm(options?: ReverseFormOptions): string` — Return the reversed ip6.arpa form of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L627) -- `correctForm(): string` — Returns the address in correct form, per [RFC 5952](https://datatracker.ietf.org/doc/html/rfc5952): leading zeros stripped, the longest run of zero groups collapsed to `::`, and hex digits lowercased (e.g. `2001:db8::1`). This is the recommended form for display. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L662) -- `binaryZeroPad(): string` — Return a zero-padded base-2 string representation of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L724) -- `parse4in6(address: string): string` — Parses a v4-in-v6 string (e.g. `::ffff:192.168.0.1`) by extracting the trailing IPv4 address into `this.address4` / `this.parsedAddress4` and returning the address with the v4 portion converted to two v6 groups. Used internally by `parse()`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L738) -- `parse(address: string): string[]` — Parses an IPv6 address string into its 8 hexadecimal groups (expanding any `::` elision and any trailing v4-in-v6 portion) and stores the result on `this.parsedAddress`. Called automatically by the constructor; you typically don't need to call it directly. Throws `AddressError` if the input is malformed. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L795) -- `canonicalForm(): string` — Returns the canonical (fully expanded) form of the address: all 8 groups, each padded to 4 hex digits, with no `::` collapsing (e.g. `2001:0db8:0000:0000:0000:0000:0000:0001`). Useful for sorting and byte-exact comparison. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L875) -- `decimal(): string` — Return the decimal form of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L883) -- `bigInt(): bigint` — Return the address as a BigInt [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L891) -- `to4(): Address4` — Return the last two groups of this address as an IPv4 address string. If this address carries a CIDR prefix that covers the trailing 32 bits (i.e. `subnetMask >= 96`), the resulting `Address4` inherits the corresponding v4 prefix (`subnetMask - 96`); otherwise it defaults to `/32`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L906) -- `to4in6(): string` — Return the v4-in-v6 form of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L930) -- `inspectTeredo(): TeredoProperties` — Decodes the Teredo tunneling fields embedded in this address. Returns the Teredo prefix, server IPv4, client IPv4, raw flag bits, cone-NAT flag, UDP port, and Microsoft-format flag breakdown (reserved, universal/local, group/individual, nonce). Only meaningful for addresses in `2001::/32`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L951) -- `inspect6to4(): SixToFourProperties` — Decodes the 6to4 tunneling fields embedded in this address. Returns the 6to4 prefix and the embedded IPv4 gateway address. Only meaningful for addresses in `2002::/16`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1014) -- `to6to4(): Address6 | null` — Return a v6 6to4 address from a v6 v4inv6 address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1034) -- `toAddress4Nat64(prefix: string): Address4 | null` — Extract the embedded IPv4 address from a NAT64 IPv6 address using the encoding defined by [RFC 6052](https://datatracker.ietf.org/doc/html/rfc6052). The default prefix is the well-known prefix `64:ff9b::/96`. Returns `null` if this address is not contained within the given prefix. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1103) -- `toByteArray(): number[]` — Return a byte array. To get a Node.js `Buffer`, wrap the result: `Buffer.from(address.toByteArray())`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1138) -- `toUnsignedByteArray(): number[]` — Return an unsigned byte array. To get a Node.js `Buffer`, wrap the result: `Buffer.from(address.toUnsignedByteArray())`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1157) -- `isCanonical(): boolean` — Returns true if the address is in the canonical form, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1233) -- `isLinkLocal(): boolean` — Returns true if the address is a link local address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1241) -- `isMulticast(): boolean` — Returns true if the address is a multicast address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1262) -- `is4(): boolean` — Returns true if the address was written in v4-in-v6 dotted-quad notation (e.g. `::ffff:127.0.0.1`), false otherwise. This is a notation-level flag and does not reflect whether the address bits lie in the IPv4-mapped (`::ffff:0:0/96`) subnet — for that, see isMapped4. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1279) -- `isMapped4(): boolean` — Returns true if the address is an IPv4-mapped IPv6 address in `::ffff:0:0/96` ([RFC 4291 §2.5.5.2](https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2)), false otherwise. Unlike is4, this checks the underlying address bits rather than the textual notation, so `::ffff:127.0.0.1` and `::ffff:7f00:1` both return true. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1291) -- `embeddedIPv4(): Address4 | null` — If this address embeds a routable IPv4 address — i.e. it is IPv4-mapped (`::ffff:0:0/96`) or sits in the NAT64 well-known prefix (`64:ff9b::/96`, [RFC 6052](https://datatracker.ietf.org/doc/html/rfc6052)) — return that embedded address as an Address4; otherwise return null. The special-property checks (`isLoopback`, `isLinkLocal`, `isMulticast`, `isUnspecified`, `isPrivate`, `isCGNAT`, `isBroadcast`) call this first and delegate to the embedded Address4 when present, so a literal such as `::ffff:127.0.0.1` is classified by what it actually reaches (loopback) rather than by its IPv6 wrapper (which `getType()` reports as IPv4-mapped). This matters wherever the checks back a trust-boundary decision (e.g. an SSRF allow/deny filter): without normalization, `::ffff:10.0.0.1`, `::ffff:169.254.169.254`, `64:ff9b::7f00:1`, etc. would all read as non-internal. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1312) -- `isTeredo(): boolean` — Returns true if the address is a Teredo address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1324) -- `is6to4(): boolean` — Returns true if the address is a 6to4 address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1332) -- `isLoopback(): boolean` — Returns true if the address is a loopback address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1340) -- `isULA(): boolean` — Returns true if the address is a Unique Local Address in `fc00::/7` ([RFC 4193](https://datatracker.ietf.org/doc/html/rfc4193)). ULAs are the IPv6 equivalent of IPv4 [RFC 1918](https://datatracker.ietf.org/doc/html/rfc1918) private addresses. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1353) -- `isPrivate(): boolean` — Returns true if the address is private, i.e. a Unique Local Address in `fc00::/7` ([RFC 4193](https://datatracker.ietf.org/doc/html/rfc4193)) or an IPv4-mapped / NAT64 address whose embedded IPv4 address is in one of the [RFC 1918](https://datatracker.ietf.org/doc/html/rfc1918) private ranges (e.g. `::ffff:10.0.0.1`). This is the IPv6 counterpart to Address4.isPrivate; use it instead of isULA when you need to catch mapped RFC 1918 addresses as well as native ULAs. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1367) -- `isCGNAT(): boolean` — Returns true if the address is an IPv4-mapped / NAT64 address whose embedded IPv4 address is in the carrier-grade NAT range `100.64.0.0/10` ([RFC 6598](https://datatracker.ietf.org/doc/html/rfc6598)), false otherwise. There is no native IPv6 CGNAT range, so this only ever returns true for an embedded IPv4 address (e.g. `::ffff:100.64.0.1`). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1384) -- `isBroadcast(): boolean` — Returns true if the address is an IPv4-mapped / NAT64 address whose embedded IPv4 address is the limited broadcast address `255.255.255.255` ([RFC 919](https://datatracker.ietf.org/doc/html/rfc919)), false otherwise. There is no IPv6 broadcast, so this only ever returns true for an embedded IPv4 address (e.g. `::ffff:255.255.255.255`). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1401) -- `isUnspecified(): boolean` — Returns true if the address is the unspecified address `::`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1414) -- `isDocumentation(): boolean` — Returns true if the address is in the documentation prefix `2001:db8::/32` ([RFC 3849](https://datatracker.ietf.org/doc/html/rfc3849)). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1427) -- `href(optionalPort?: string | number): string` — Returns the address as an HTTP URL with the host bracketed, e.g. `http://[2001:db8::1]/`. If `optionalPort` is provided it is appended, e.g. `http://[2001:db8::1]:8080/`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1438) -- `link(options?: { className?: string; prefix?: string; v4?: boolean }): string` — Returns an HTML `` element whose `href` encodes the address in a URL hash fragment (default prefix `/#address=`). Useful for linking between pages of an address-inspector UI. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1456) -- `group(): string` — Groups an address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1496) -- `regularExpressionString(this: Address6, substringSearch: boolean): string` — Generate a regular expression string that can be used to find or validate all variations of this address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1548) -- `regularExpression(this: Address6, substringSearch: boolean): RegExp` — Generate a regular expression that can be used to find or validate all variations of this address. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1602) +- `microsoftTranscription(): string` — Return the Microsoft UNC transcription of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L419) +- `mask(mask?: number): string` — Return the first n bits of the address, defaulting to the subnet mask [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L428) +- `possibleSubnets(subnetSize?: number): string` — Return the number of possible subnets of a given size in the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L438) +- `startAddress(): Address6` — The first address in the range given by this address' subnet Often referred to as the Network Address. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L463) +- `startAddressExclusive(): Address6` — The first host address in the range given by this address's subnet ie the first address after the Network Address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L472) +- `endAddress(): Address6` — The last address in the range given by this address' subnet Often referred to as the Broadcast [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L490) +- `endAddressExclusive(): Address6` — The last host address in the range given by this address's subnet ie the last address prior to the Broadcast Address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L499) +- `subnetMaskAddress(): Address6` — The hex form of the subnet mask, e.g. `ffff:ffff:ffff:ffff::` for a `/64`. Returns an `Address6`; call `.correctForm()` for the string. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L509) +- `wildcardMask(): Address6` — The Cisco-style wildcard mask, e.g. `::ffff:ffff:ffff:ffff` for a `/64`. This is the bitwise inverse of `subnetMaskAddress()`. Returns an `Address6`; call `.correctForm()` for the string. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L521) +- `networkForm(): string` — The network address in CIDR string form, e.g. `2001:db8::/32` for `2001:db8::1/32`. For an address with no explicit subnet the prefix is `/128`, e.g. `networkForm()` on `2001:db8::1` returns `2001:db8::1/128`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L534) +- `getScope(): string` — Return the scope of the address. The 4-bit scope field ([RFC 4291 §2.7](https://datatracker.ietf.org/doc/html/rfc4291#section-2.7)) is only defined for multicast addresses; for unicast addresses the scope is derived from the address type per [RFC 4007 §6](https://datatracker.ietf.org/doc/html/rfc4007#section-6). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L546) +- `getType(): string` — Return the type of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L573) +- `getBits(start: number, end: number): bigint` — Return the bits in the given range as a BigInt [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L588) +- `getBitsBase2(start: number, end: number): string` — Return the bits in the given range as a base-2 string [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L596) +- `getBitsBase16(start: number, end: number): string` — Return the bits in the given range as a base-16 string [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L604) +- `getBitsPastSubnet(): string` — Return the bits that are set past the subnet mask length [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L620) +- `reverseForm(options?: ReverseFormOptions): string` — Return the reversed ip6.arpa form of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L630) +- `correctForm(): string` — Returns the address in correct form, per [RFC 5952](https://datatracker.ietf.org/doc/html/rfc5952): leading zeros stripped, the longest run of zero groups collapsed to `::`, and hex digits lowercased (e.g. `2001:db8::1`). This is the recommended form for display. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L665) +- `binaryZeroPad(): string` — Return a zero-padded base-2 string representation of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L727) +- `parse4in6(address: string): string` — Parses a v4-in-v6 string (e.g. `::ffff:192.168.0.1`) by extracting the trailing IPv4 address into `this.address4` / `this.parsedAddress4` and returning the address with the v4 portion converted to two v6 groups. Used internally by `parse()`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L741) +- `parse(address: string): string[]` — Parses an IPv6 address string into its 8 hexadecimal groups (expanding any `::` elision and any trailing v4-in-v6 portion) and stores the result on `this.parsedAddress`. Called automatically by the constructor; you typically don't need to call it directly. Throws `AddressError` if the input is malformed. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L798) +- `canonicalForm(): string` — Returns the canonical (fully expanded) form of the address: all 8 groups, each padded to 4 hex digits, with no `::` collapsing (e.g. `2001:0db8:0000:0000:0000:0000:0000:0001`). Useful for sorting and byte-exact comparison. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L878) +- `decimal(): string` — Return the decimal form of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L886) +- `bigInt(): bigint` — Return the address as a BigInt [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L894) +- `to4(): Address4` — Return the last two groups of this address as an IPv4 address string. If this address carries a CIDR prefix that covers the trailing 32 bits (i.e. `subnetMask >= 96`), the resulting `Address4` inherits the corresponding v4 prefix (`subnetMask - 96`); otherwise it defaults to `/32`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L909) +- `to4in6(): string` — Return the v4-in-v6 form of the address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L933) +- `inspectTeredo(): TeredoProperties` — Decodes the Teredo tunneling fields embedded in this address. Returns the Teredo prefix, server IPv4, client IPv4, raw flag bits, cone-NAT flag, UDP port, and Microsoft-format flag breakdown (reserved, universal/local, group/individual, nonce). Only meaningful for addresses in `2001::/32`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L954) +- `inspect6to4(): SixToFourProperties` — Decodes the 6to4 tunneling fields embedded in this address. Returns the 6to4 prefix and the embedded IPv4 gateway address. Only meaningful for addresses in `2002::/16`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1017) +- `to6to4(): Address6 | null` — Return a v6 6to4 address from a v6 v4inv6 address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1037) +- `toAddress4Nat64(prefix: string): Address4 | null` — Extract the embedded IPv4 address from a NAT64 IPv6 address using the encoding defined by [RFC 6052](https://datatracker.ietf.org/doc/html/rfc6052). The default prefix is the well-known prefix `64:ff9b::/96`. Returns `null` if this address is not contained within the given prefix. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1106) +- `toByteArray(): number[]` — Return a byte array. To get a Node.js `Buffer`, wrap the result: `Buffer.from(address.toByteArray())`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1141) +- `toUnsignedByteArray(): number[]` — Return an unsigned byte array. To get a Node.js `Buffer`, wrap the result: `Buffer.from(address.toUnsignedByteArray())`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1160) +- `isCanonical(): boolean` — Returns true if the address is in the canonical form, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1236) +- `isLinkLocal(): boolean` — Returns true if the address is a link local address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1244) +- `isMulticast(): boolean` — Returns true if the address is a multicast address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1265) +- `is4(): boolean` — Returns true if the address was written in v4-in-v6 dotted-quad notation (e.g. `::ffff:127.0.0.1`), false otherwise. This is a notation-level flag and does not reflect whether the address bits lie in the IPv4-mapped (`::ffff:0:0/96`) subnet — for that, see isMapped4. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1282) +- `isMapped4(): boolean` — Returns true if the address is an IPv4-mapped IPv6 address in `::ffff:0:0/96` ([RFC 4291 §2.5.5.2](https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2)), false otherwise. Unlike is4, this checks the underlying address bits rather than the textual notation, so `::ffff:127.0.0.1` and `::ffff:7f00:1` both return true. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1294) +- `embeddedIPv4(): Address4 | null` — If this address embeds a routable IPv4 address — i.e. it is IPv4-mapped (`::ffff:0:0/96`) or sits in the NAT64 well-known prefix (`64:ff9b::/96`, [RFC 6052](https://datatracker.ietf.org/doc/html/rfc6052)) — return that embedded address as an Address4; otherwise return null. The special-property checks (`isLoopback`, `isLinkLocal`, `isMulticast`, `isUnspecified`, `isPrivate`, `isCGNAT`, `isBroadcast`) call this first and delegate to the embedded Address4 when present, so a literal such as `::ffff:127.0.0.1` is classified by what it actually reaches (loopback) rather than by its IPv6 wrapper (which `getType()` reports as IPv4-mapped). This matters wherever the checks back a trust-boundary decision (e.g. an SSRF allow/deny filter): without normalization, `::ffff:10.0.0.1`, `::ffff:169.254.169.254`, `64:ff9b::7f00:1`, etc. would all read as non-internal. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1315) +- `isTeredo(): boolean` — Returns true if the address is a Teredo address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1327) +- `is6to4(): boolean` — Returns true if the address is a 6to4 address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1335) +- `isLoopback(): boolean` — Returns true if the address is a loopback address, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1343) +- `isULA(): boolean` — Returns true if the address is a Unique Local Address in `fc00::/7` ([RFC 4193](https://datatracker.ietf.org/doc/html/rfc4193)). ULAs are the IPv6 equivalent of IPv4 [RFC 1918](https://datatracker.ietf.org/doc/html/rfc1918) private addresses. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1356) +- `isPrivate(): boolean` — Returns true if the address is private, i.e. a Unique Local Address in `fc00::/7` ([RFC 4193](https://datatracker.ietf.org/doc/html/rfc4193)) or an IPv4-mapped / NAT64 address whose embedded IPv4 address is in one of the [RFC 1918](https://datatracker.ietf.org/doc/html/rfc1918) private ranges (e.g. `::ffff:10.0.0.1`). This is the IPv6 counterpart to Address4.isPrivate; use it instead of isULA when you need to catch mapped RFC 1918 addresses as well as native ULAs. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1370) +- `isCGNAT(): boolean` — Returns true if the address is an IPv4-mapped / NAT64 address whose embedded IPv4 address is in the carrier-grade NAT range `100.64.0.0/10` ([RFC 6598](https://datatracker.ietf.org/doc/html/rfc6598)), false otherwise. There is no native IPv6 CGNAT range, so this only ever returns true for an embedded IPv4 address (e.g. `::ffff:100.64.0.1`). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1387) +- `isBroadcast(): boolean` — Returns true if the address is an IPv4-mapped / NAT64 address whose embedded IPv4 address is the limited broadcast address `255.255.255.255` ([RFC 919](https://datatracker.ietf.org/doc/html/rfc919)), false otherwise. There is no IPv6 broadcast, so this only ever returns true for an embedded IPv4 address (e.g. `::ffff:255.255.255.255`). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1404) +- `isUnspecified(): boolean` — Returns true if the address is the unspecified address `::`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1417) +- `isDocumentation(): boolean` — Returns true if the address is in the documentation prefix `2001:db8::/32` ([RFC 3849](https://datatracker.ietf.org/doc/html/rfc3849)). [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1430) +- `href(optionalPort?: string | number): string` — Returns the address as an HTTP URL with the host bracketed, e.g. `http://[2001:db8::1]/`. If `optionalPort` is provided it is appended, e.g. `http://[2001:db8::1]:8080/`. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1441) +- `link(options?: { className?: string; prefix?: string; v4?: boolean }): string` — Returns an HTML `` element whose `href` encodes the address in a URL hash fragment (default prefix `/#address=`). Useful for linking between pages of an address-inspector UI. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1459) +- `group(): string` — Groups an address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1499) +- `regularExpressionString(this: Address6, substringSearch: boolean): string` — Generate a regular expression string that can be used to find or validate all variations of this address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1551) +- `regularExpression(this: Address6, substringSearch: boolean): RegExp` — Generate a regular expression that can be used to find or validate all variations of this address. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1605) **Properties** @@ -255,9 +255,9 @@ A few terms used throughout the API can be confusing if you haven't worked deepl - `subnetMask: number` — [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L108) - `v4: boolean` — [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L109) - `zone: string` — [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L110) -- `isInSubnet: (this: Address4 | Address6, address: Address4 | Address6) => boolean` — Returns true if the given address is in the subnet of the current address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1213) -- `isHostInSubnet: (this: Address4 | Address6, address: Address4 | Address6) => boolean` — Returns true if this address's host bits fall inside the given subnet, ignoring this address's own subnet mask. See common.isHostInSubnet. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1221) -- `isCorrect: (this: Address4 | Address6) => boolean` — Returns true if the address is correct, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1227) +- `isInSubnet: (this: Address4 | Address6, address: Address4 | Address6) => boolean` — Returns true if the given address is in the subnet of the current address [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1216) +- `isHostInSubnet: (this: Address4 | Address6, address: Address4 | Address6) => boolean` — Returns true if this address's host bits fall inside the given subnet, ignoring this address's own subnet mask. See common.isHostInSubnet. [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1224) +- `isCorrect: (this: Address4 | Address6) => boolean` — Returns true if the address is correct, false otherwise [src](https://github.com/beaugunderson/ip-address/blob/master/src/ipv6.ts#L1230) diff --git a/src/ipv6.ts b/src/ipv6.ts index a2311a8..8e91182 100644 --- a/src/ipv6.ts +++ b/src/ipv6.ts @@ -214,33 +214,28 @@ export class Address6 { let host: string; let port: string | number | null = null; let result: RegExpExecArray | null; + let error: string; // Remove the protocol prefix, if any const stripped = url.replace(/^[a-z][a-z0-9+.-]*:\/\//i, ''); // If we have brackets parse them and find a port if (stripped.indexOf('[') !== -1 && stripped.indexOf(']:') !== -1) { + error = 'failed to parse address with port'; result = constants6.RE_URL_WITH_PORT.exec(stripped); if (result === null) { - return { - error: 'failed to parse address with port', - address: null, - port: null, - }; + return { error, address: null, port: null }; } host = result[1]; port = result[2]; } else { + error = 'failed to parse address from URL'; result = constants6.RE_URL.exec(stripped); if (result === null) { - return { - error: 'failed to parse address from URL', - address: null, - port: null, - }; + return { error, address: null, port: null }; } host = result[1] ?? result[2]; @@ -259,10 +254,18 @@ export class Address6 { port = null; } - return { - address: new Address6(host), - port, - }; + // The URL character class is a superset of valid IPv6, so a host the + // regex accepted (an IPv4 literal, bare punctuation, too many groups) + // can still be rejected by the parser + let address: Address6; + + try { + address = new Address6(host); + } catch { + return { error, address: null, port: null }; + } + + return { address, port }; } /** diff --git a/test/functionality-v6-test.ts b/test/functionality-v6-test.ts index 2cc03a9..90388b0 100644 --- a/test/functionality-v6-test.ts +++ b/test/functionality-v6-test.ts @@ -690,6 +690,75 @@ describe('v6', () => { expect(obj.address?.address).to.equal('::ffff:192.168.1.1'); expect(obj.port).to.equal(8080); }); + + it('should fail gracefully for an IPv4 host', () => { + const obj = Address6.fromURL('http://127.0.0.1/admin'); + + expect(obj.error).to.equal('failed to parse address from URL'); + expect(obj.address).to.equal(null); + expect(obj.port).to.equal(null); + }); + + it('should fail gracefully for a bracketed IPv4 host with a port', () => { + const obj = Address6.fromURL('http://[169.254.169.254]:8080/latest'); + + expect(obj.error).to.equal('failed to parse address with port'); + expect(obj.address).to.equal(null); + expect(obj.port).to.equal(null); + }); + + it('should fail gracefully for a bare IPv4 address', () => { + const obj = Address6.fromURL('0.0.0.0'); + + expect(obj.error).to.equal('failed to parse address from URL'); + expect(obj.address).to.equal(null); + expect(obj.port).to.equal(null); + }); + + it('should fail gracefully for too many colons', () => { + const obj = Address6.fromURL('http://[:::]/foo'); + + expect(obj.error).to.equal('failed to parse address from URL'); + expect(obj.address).to.equal(null); + expect(obj.port).to.equal(null); + }); + + it('should fail gracefully for too many groups', () => { + const obj = Address6.fromURL('http://[1:2:3:4:5:6:7:8:9]:80/foo'); + + expect(obj.error).to.equal('failed to parse address with port'); + expect(obj.address).to.equal(null); + expect(obj.port).to.equal(null); + }); + + it('should fail gracefully for out of range v4-in-v6 octets', () => { + const obj = Address6.fromURL('http://[::ffff:999.1.1.1]/foo'); + + expect(obj.error).to.equal('failed to parse address from URL'); + expect(obj.address).to.equal(null); + expect(obj.port).to.equal(null); + }); + + it('should never throw for a host matching the URL character class', () => { + const hosts = [ + '1.2.3.4', + '255.255.255.255', + '[127.0.0.1]:65535', + '.', + '..', + ':', + '::::', + 'ffff', + 'abcdef', + '1:2', + '[::ffff:1.2.3.4.5]:80', + ]; + + hosts.forEach((host) => { + expect(() => Address6.fromURL(`http://${host}/`), host).to.not.throw(); + expect(() => Address6.fromURL(host), host).to.not.throw(); + }); + }); }); describe('regularExpressionString', () => {