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refactor: avoid unnecessary heap alloc when reading PadC (#3534)

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Charles Kerr 2022-07-27 22:17:05 -05:00 committed by GitHub
parent 366d7f0702
commit d8d03b8e3b
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1 changed files with 10 additions and 4 deletions
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14
libtransmission/handshake.cc
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@ -48,6 +48,7 @@ static auto constexpr INCOMING_HANDSHAKE_LEN = int{ 48 };
// encryption constants
static auto constexpr PadA_MAXLEN = int{ 512 };
static auto constexpr PadB_MAXLEN = int{ 512 };
static auto constexpr PadC_MAXLEN = int{ 512 };
static auto constexpr CRYPTO_PROVIDE_PLAINTEXT = int{ 1 };
static auto constexpr CRYPTO_PROVIDE_CRYPTO = int{ 2 };
@ -823,6 +824,12 @@ static ReadState readCryptoProvide(tr_handshake* handshake, struct evbuffer* inb
tr_peerIoReadUint16(handshake->io, inbuf, &padc_len);
tr_logAddTraceHand(handshake, fmt::format("padc is {}", padc_len));
if (padc_len > PadC_MAXLEN)
{
tr_logAddTraceHand(handshake, "peer's PadC is too big");
return tr_handshakeDone(handshake, false);
}
handshake->pad_c_len = padc_len;
setState(handshake, AWAITING_PAD_C);
return READ_NOW;
@ -837,10 +844,9 @@ static ReadState readPadC(tr_handshake* handshake, struct evbuffer* inbuf)
return READ_LATER;
}
/* read the throwaway padc */
auto* const padc = tr_new(char, handshake->pad_c_len);
tr_peerIoReadBytes(handshake->io, inbuf, padc, handshake->pad_c_len);
tr_free(padc);
// read the throwaway padc
auto pad_c = std::array<char, PadC_MAXLEN>{};
tr_peerIoReadBytes(handshake->io, inbuf, std::data(pad_c), handshake->pad_c_len);
/* read ia_len */
tr_peerIoReadUint16(handshake->io, inbuf, &ia_len);