view auto/endianness @ 9179:ea1f29c2010c

HTTP/2: fixed buffer management with HTTP/2 auto-detection. As part of normal HTTP/2 processing, incomplete frames are saved in the control state using a fixed size memcpy of NGX_HTTP_V2_STATE_BUFFER_SIZE. For this matter, two state buffers are reserved in the HTTP/2 recv buffer. As part of HTTP/2 auto-detection on plain TCP connections, initial data is first read into a buffer specified by the client_header_buffer_size directive that doesn't have state reservation. Previously, this made it possible to over-read the buffer as part of saving the state. The fix is to read the available buffer size rather than a fixed size. Although memcpy of a fixed size can produce a better optimized code, handling of incomplete frames isn't a common execution path, so it was sacrificed for the sake of simplicity of the fix.
author Sergey Kandaurov <pluknet@nginx.com>
date Sat, 21 Oct 2023 18:48:24 +0400
parents e3faa5fb7772
children
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


echo $ngx_n "checking for system byte ordering ...$ngx_c"

cat << END >> $NGX_AUTOCONF_ERR

----------------------------------------
checking for system byte ordering

END


cat << END > $NGX_AUTOTEST.c

int main(void) {
    int i = 0x11223344;
    char *p;

    p = (char *) &i;
    if (*p == 0x44) return 0;
    return 1;
}

END

ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS \
          -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_LD_OPT $ngx_feature_libs"

eval "$ngx_test >> $NGX_AUTOCONF_ERR 2>&1"

if [ -x $NGX_AUTOTEST ]; then
    if $NGX_AUTOTEST >/dev/null 2>&1; then
        echo " little endian"
        have=NGX_HAVE_LITTLE_ENDIAN . auto/have
    else
        echo " big endian"
    fi

    rm -rf $NGX_AUTOTEST*

else
    rm -rf $NGX_AUTOTEST*

    echo
    echo "$0: error: cannot detect system byte ordering"
    exit 1
fi