💾 Archived View for gemini.conman.org › sourcecode › client.lua captured on 2023-09-28 at 16:07:53.
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#!/usr/bin/env lua
-- ************************************************************************
--
-- Client program
-- Copyright 2019 by Sean Conner. All Rights Reserved.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
--
-- Comments, questions and criticisms can be sent to: sean@conman.org
--
-- ************************************************************************
-- luacheck: ignore 611
local tls = require "org.conman.net.tls"
local url = require "org.conman.parsers.iri"
local idn = require "org.conman.idn"
local uurl = require "GLV-1.url-util"
local getopt = require "org.conman.getopt".getopt
local lpeg = require "lpeg"
local CERT = os.getenv("GEMINI_CERT")
local KEY = os.getenv("GEMINI_KEY")
local NOVER
-- ************************************************************************
local statparse do
local Cc = lpeg.Cc
local C = lpeg.C
local P = lpeg.P
local R = lpeg.R
local S = lpeg.S
local status = P"1" * R"09" * Cc'input' * Cc'required' * Cc(true)
+ P"2" * R"09" * Cc'okay' * Cc'content' * Cc(true)
+ P"3" * R"09" * Cc'redirect' * Cc'temporary' * Cc(true)
+ P"4" * R"09" * Cc'error' * Cc'temporary' * Cc(true)
+ P"5" * R"09" * Cc'error' * Cc'permanent' * Cc(true)
+ P"6" * R"09" * Cc'auth' * Cc'required' * Cc(true)
local infotype = S" \t"^1 * C(R" \255"^0)
+ Cc"type/text; charset=utf-8"
statparse = status * infotype
end
-- ************************************************************************
local function main(location,usecert,rcount)
rcount = rcount or 1
local loc = url:match(location)
if not loc then
io.stderr:write("Error: Parse error with given URL\n")
os.exit(1)
end
if loc.scheme ~= 'gemini' then
io.stderr:write(string.format("Error: %s: scheme %q not supported\n",location,loc.scheme))
os.exit(1)
end
io.stderr:write(
string.format("Location: %s\n",loc.host),
string.format("Encoded: %s\n",idn.encode(loc.host))
)
local ios = tls.connect(idn.encode(loc.host),loc.port,function(conf)
if usecert then
if not conf:cert_file(CERT)
or not conf:key_file(KEY) then
return false
end
end
if NOVER then
conf:insecure_no_verify_name()
conf:insecure_no_verify_time()
conf:insecure_no_verify_cert()
end
return conf:protocols "all"
end)
if not ios then
io.stderr:write("Error: cannot connect to ",loc.host,"\n")
return
end
local okay,err = ios:write(location,"\r\n")
if not okay then
io.stderr:write("Error: ios:write() = ",err,"\n")
ios:close()
return
end
local statline = ios:read("*l")
if not statline then
io.stderr:write("Error: bad request\n")
ios:close()
return
end
io.stderr:write("Status-Line: ",statline,"\n")
local system,status,std,info = statparse:match(statline)
if not system then
io.stderr:write("Error: bad reply: ",statline,"\n")
ios:close()
return
end
io.stderr:write(
string.format("System: %s\n",system),
string.format("Status: %s\n",status),
string.format("Info: %s%s\n",info,std and "" or "OUTDATED")
)
if system == 'auth' then
if status == 'required' and CERT and KEY then
ios:close()
return main(location,true)
end
elseif system == 'redirect' then
if rcount == 5 then
io.stderr:write(string.format("Error: too man redirects\n"))
else
local where = url:match(info)
local new = uurl.merge(loc,where)
local newloc = uurl.toa(new)
io.stderr:write(string.format("Redirect: %s\n",newloc))
ios:close()
return main(newloc,usecert,rcount + 1)
end
elseif system == 'okay' then
io.stderr:write(
string.format("Cipher: %s\n",ios.__ctx:conn_cipher()),
string.format("Version: %s\n",ios.__ctx:conn_version()),
string.format("Cipher-Strength: %d\n",ios.__ctx:conn_cipher_strength()),
string.format("Server: %s\n",ios.__ctx:conn_servername()),
string.format("ALPN: %s\n",ios.__ctx:conn_alpn_selected()),
"\n"
)
repeat
local data = ios:read("*b")
if data then io.stdout:write(data) end
until not data
ios:close()
else
ios:close()
end
end
-- ************************************************************************
local URL
local usage = [[
usage: %s [options] url
-c | --cert certificate
-k | --key keyfile
-n | --noverify
-h | --help this text
]]
local opts =
{
{ "c" , "cert" , true , function(c) CERT = c end },
{ "k" , "key" , true , function(k) KEY = k end },
{ "n" , "noverify" , false , function() NOVER = true end },
{ 'h' , "help" , false , function()
io.stderr:write(string.format(usage,arg[0]))
os.exit(false,true)
end
},
}
if #arg == 0 then
io.stderr:write(string.format(usage,arg[0]))
os.exit(false,true)
end
URL = arg[getopt(arg,opts)]
main(URL)