prosody
3a1b1d3084fb
util/format.lua

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util/format.lua @ 10721:3a1b1d3084fb 0.11

core.certmanager: Move EECDH ciphers before EDH in default cipherstring (fixes #1513) Backport of 94e341dee51c The original intent of having kEDH before kEECDH was that if a `dhparam` file was specified, this would be interpreted as a preference by the admin for old and well-tested Diffie-Hellman key agreement over newer elliptic curve ones. Otherwise the faster elliptic curve ciphersuites would be preferred. This didn't really work as intended since this affects the ClientHello on outgoing s2s connections, leading to some servers using poorly configured kEDH. With Debian shipping OpenSSL settings that enforce a higher security level, this caused interoperability problems with servers that use DH params smaller than 2048 bits. E.g. jabber.org at the time of this writing has 1024 bit DH params. MattJ says > Curves have won, and OpenSSL is less weird about them now
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:22:35 +0200
parent 8417:e88db5668cfb
child 9656:3da6cc927ee6
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70cb72f46a3b util.format: A string.format wrapper that gracefully handles invalid arguments
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1 --
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2 -- A string.format wrapper that gracefully handles invalid arguments
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3 --
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4
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5 local tostring = tostring;
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6 local select = select;
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7 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
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8 local type = type;
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9
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10 local function format(formatstring, ...)
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11 local args, args_length = { ... }, select('#', ...);
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12
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13 -- format specifier spec:
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14 -- 1. Start: '%%'
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15 -- 2. Flags: '[%-%+ #0]'
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16 -- 3. Width: '%d?%d?'
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17 -- 4. Precision: '%.?%d?%d?'
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18 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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19 --
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20 -- The options c, d, E, e, f, g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.
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21 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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22 -- a and A are only in Lua 5.2+
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24
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25 -- process each format specifier
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26 local i = 0;
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27 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGqs%%]*[cdiouxXaAeEfgGqs%%]", function(spec)
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28 if spec ~= "%%" then
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29 i = i + 1;
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30 local arg = args[i];
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31 if arg == nil then -- special handling for nil
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32 arg = "<nil>"
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33 args[i] = "<nil>";
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34 end
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35
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36 local option = spec:sub(-1);
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37 if option == "q" or option == "s" then -- arg should be string
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38 args[i] = tostring(arg);
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39 elseif type(arg) ~= "number" then -- arg isn't number as expected?
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40 args[i] = tostring(arg);
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41 spec = "[%s]";
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42 end
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43 end
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44 return spec;
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45 end);
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46
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47 -- process extra args
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48 while i < args_length do
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49 i = i + 1;
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50 local arg = args[i];
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51 if arg == nil then
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52 args[i] = "<nil>";
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53 else
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54 args[i] = tostring(arg);
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55 end
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56 formatstring = formatstring .. " [%s]"
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57 end
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58
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59 return formatstring:format(unpack(args));
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60 end
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61
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62 return {
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63 format = format;
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64 };