From 4b2782a926d8f131b1e7382be35e3abb77bf4be5 Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Sun, 7 Sep 2014 02:40:44 +0000 Subject: http: reduce parser from 72 to 56 bytes on 64-bit This allows the parser struct to fit in one cache line on x86-64 systems where cache lines are 64 bytes. Using 32-bit integer lengths is safe here because these are only for tracking offsets within the HTTP header buffer. We can safely limit HTTP headers and in-memory buffers to be less than 4GB without anybody complaining. HTTP bodies continue to use off_t (usually 64-bit, even on 32-bit systems) sizes and support as much as the OS/hardware can handle. --- ext/unicorn_http/unicorn_http.rl | 18 +++++++++--------- test/unit/test_http_parser_ng.rb | 6 ++++++ 2 files changed, 15 insertions(+), 9 deletions(-) diff --git a/ext/unicorn_http/unicorn_http.rl b/ext/unicorn_http/unicorn_http.rl index 9372d39..3294357 100644 --- a/ext/unicorn_http/unicorn_http.rl +++ b/ext/unicorn_http/unicorn_http.rl @@ -29,27 +29,27 @@ void init_unicorn_httpdate(void); /* all of these flags need to be set for keepalive to be supported */ #define UH_FL_KEEPALIVE (UH_FL_KAVERSION | UH_FL_REQEOF | UH_FL_HASHEADER) -static size_t MAX_HEADER_LEN = 1024 * (80 + 32); /* same as Mongrel */ +static unsigned int MAX_HEADER_LEN = 1024 * (80 + 32); /* same as Mongrel */ /* this is only intended for use with Rainbows! */ static VALUE set_maxhdrlen(VALUE self, VALUE len) { - return SIZET2NUM(MAX_HEADER_LEN = NUM2SIZET(len)); + return UINT2NUM(MAX_HEADER_LEN = NUM2UINT(len)); } /* keep this small for Rainbows! since every client has one */ struct http_parser { int cs; /* Ragel internal state */ unsigned int flags; - size_t mark; - size_t offset; + unsigned int mark; + unsigned int offset; union { /* these 2 fields don't nest */ - size_t field; - size_t query; + unsigned int field; + unsigned int query; } start; union { - size_t field_len; /* only used during header processing */ - size_t dest_offset; /* only used during body processing */ + unsigned int field_len; /* only used during header processing */ + unsigned int dest_offset; /* only used during body processing */ } s; VALUE buf; VALUE env; @@ -74,7 +74,7 @@ static void parser_raise(VALUE klass, const char *msg) } #define REMAINING (unsigned long)(pe - p) -#define LEN(AT, FPC) (FPC - buffer - hp->AT) +#define LEN(AT, FPC) (FPC - buffer - (unsigned long)hp->AT) #define MARK(M,FPC) (hp->M = (FPC) - buffer) #define PTR_TO(F) (buffer + hp->F) #define STR_NEW(M,FPC) rb_str_new(PTR_TO(M), LEN(M, FPC)) diff --git a/test/unit/test_http_parser_ng.rb b/test/unit/test_http_parser_ng.rb index 9167845..d5c8d2e 100644 --- a/test/unit/test_http_parser_ng.rb +++ b/test/unit/test_http_parser_ng.rb @@ -11,6 +11,12 @@ class HttpParserNgTest < Test::Unit::TestCase @parser = HttpParser.new end + def test_parser_max_len + assert_raises(RangeError) do + HttpParser.max_header_len = 0xffffffff + 1 + end + end + def test_next_clear r = "GET / HTTP/1.1\r\nHost: example.com\r\n\r\n" @parser.buf << r -- cgit v1.2.3-24-ge0c7