83 lines
2.6 KiB
Markdown
83 lines
2.6 KiB
Markdown
# whois
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Lightweight library for retrieving WHOIS information on a domain.
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It automatically retrieves the appropriate WHOIS server based on the domain's TLD by first querying IANA.
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## Usage
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### As an executable
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To install it:
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```console
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go install github.com/TwiN/whois/cmd/whois@latest
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```
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Alternatively, you can download whois from the [release](https://github.com/TwiN/whois/releases) section, though you'll have to unzip the file first.
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To run it:
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```console
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whois example.com
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```
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### As a library
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```console
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go get github.com/TwiN/whois
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```
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#### Query
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If all you want is the text a WHOIS server would return you, you can use the `Query` method of the `whois.Client` type:
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```go
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package main
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import "github.com/TwiN/whois"
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func main() {
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client := whois.NewClient()
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output, err := client.Query("example.com")
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if err != nil {
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panic(err)
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}
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println(output)
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}
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```
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#### QueryAndParse
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If you want specific pieces of information, you can use the `QueryAndParse` method of the `whois.Client` type:
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```go
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package main
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import "github.com/TwiN/whois"
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func main() {
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client := whois.NewClient()
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response, err := client.QueryAndParse("example.com")
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if err != nil {
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panic(err)
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}
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println(response.ExpirationDate.String())
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}
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```
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Note that because there is no standardized format for WHOIS responses, this parsing may not be successful for every single TLD.
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Currently, the only fields parsed are:
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- `ExpirationDate`: The time.Time at which the domain will expire
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- `DomainStatuses`: The statuses that the domain currently has (e.g. `clientTransferProhibited`)
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- `NameServers`: The nameservers currently tied to the domain
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If you'd like one or more other fields to be parsed, please don't be shy and create an issue or a pull request.
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#### Caching referral WHOIS servers
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The way that WHOIS scales is by having one "main" WHOIS server, namely `whois.iana.org:43`, refer to other WHOIS server
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on a per-TLD basis.
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In other word, let's say that you wanted to have the WHOIS information for `example.com`.
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The first step would be to query `whois.iana.org:43` with `com`, which would return `whois.verisign-grs.com`.
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Then, you would query `whois.verisign-grs.com:43` for the WHOIS information on `example.com`.
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If you're querying a lot of servers, making two queries instead of one can be a little wasteful, hence `WithReferralCache(true)`:
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```go
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client := whois.NewClient().WithReferralCache(true)
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```
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The above will cache the referral WHOIS server for each TLD, so that you can directly query the appropriate WHOIS server
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instead of first querying `whois.iana.org:43` for the referral.
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