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# Overbuilt myip module | ||
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Collect and determine what is probably our source ip, only, providing the most common response, which we hope will always be the most correct. | ||
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See variables.tf for variables including the list of sources we can check. | ||
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See outputs.tf for outputs. |
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terraform { | ||
required_providers { | ||
curl = { | ||
version = "1.0.2" | ||
source = "anschoewe/curl" | ||
} | ||
} | ||
} | ||
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# curl is the default method | ||
data "curl" "myip" { | ||
for_each = var.data_provider == "curl" ? toset(var.myip_service_urls) : [] | ||
http_method = "GET" | ||
uri = each.key | ||
} | ||
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# but we can use http if you prefer | ||
data "http" "myip" { | ||
for_each = var.data_provider == "http" ? toset(var.myip_service_urls) : [] | ||
url = each.key | ||
method = "GET" | ||
request_timeout_ms = 500 | ||
} | ||
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locals { | ||
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# build a list of responses | ||
service_response_bodies = var.data_provider == "curl" ? values(data.curl.myip)[*].response : values(data.http.myip)[*].response_body | ||
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# remunge it without whitespace as a list of strings | ||
split_output = split(",", replace(trimspace(join(",", local.service_response_bodies)), "/\\s/", "")) | ||
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# we test responses for valid v4 or v6 | ||
ipv4_matches = [ | ||
for cidr in local.split_output : cidr | ||
if can(cidrnetmask("${cidr}/32")) | ||
] | ||
ipv6_matches = [ | ||
for cidr in local.split_output : cidr | ||
if can(cidrhost("${cidr}/128", 0)) | ||
] | ||
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# what follows is a really long winded version of uniq -c | sort -n | ||
ipv4_index_list = [for index, item in local.ipv4_matches : length([for i in slice(local.ipv4_matches, 0, index + 1) : i if i == item])] | ||
ipv4_joined_index = zipmap(local.ipv4_matches, local.ipv4_index_list) | ||
ipv4_reverse_index = { for k, v in local.ipv4_joined_index : v => k... } | ||
ipv4_most_common_response = local.ipv4_reverse_index != {} ? lookup( | ||
local.ipv4_reverse_index, | ||
element( | ||
sort(keys(local.ipv4_reverse_index)), | ||
length(local.ipv4_reverse_index) - 1 | ||
) | ||
) : [] | ||
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# uniq -c | sort -n again but for ipv6 | ||
ipv6_index_list = [for index, item in local.ipv6_matches : length([for i in slice(local.ipv6_matches, 0, index + 1) : i if i == item])] | ||
ipv6_joined_index = zipmap(local.ipv6_matches, local.ipv6_index_list) | ||
ipv6_reverse_index = { for k, v in local.ipv6_joined_index : v => k... } | ||
ipv6_most_common_response = local.ipv6_reverse_index != {} ? lookup( | ||
local.ipv6_reverse_index, | ||
element( | ||
sort(keys(local.ipv6_reverse_index)), | ||
length(local.ipv6_reverse_index) - 1 | ||
) | ||
) : [] | ||
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} | ||
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# See outputs.tf for where we spit out the winners |
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output "ipv4_matches" { | ||
value = local.ipv4_matches | ||
} | ||
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output "ipv6_matches" { | ||
value = local.ipv6_matches | ||
} | ||
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output "ipv4_most_common_response" { | ||
value = join("", local.ipv4_most_common_response) | ||
} | ||
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output "ipv6_most_common_response" { | ||
value = join("", local.ipv6_most_common_response) | ||
} |
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variable "myip_service_urls" { | ||
default = [ | ||
"https://api.seeip.org", | ||
"https://ipinfo.io/ip", | ||
"https://ifconfig.co", | ||
"https://icanhazip.com", | ||
"https://api.ipify.org", | ||
"https://ifconfig.me", | ||
"https://ipecho.net/plain", | ||
"https://ifconfig.io", | ||
"http://eth0.me/", | ||
"https://ident.me", | ||
"https://ipv4.ident.me", | ||
] | ||
} | ||
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variable "data_provider" { | ||
default = "curl" | ||
description = "(curl) or (http) provider are both supported." | ||
} |