1 files changed, 528 insertions, 0 deletions
diff --git a/ext/unicorn/http11/http11.c b/ext/unicorn/http11/http11.c
new file mode 100644
index 0000000..82982e7
--- /dev/null
+++ b/ext/unicorn/http11/http11.c
@@ -0,0 +1,528 @@
+/**
+ * Copyright (c) 2005 Zed A. Shaw
+ * You can redistribute it and/or modify it under the same terms as Ruby.
+ */
+#include "ruby.h"
+#include "ext_help.h"
+#include <assert.h>
+#include <string.h>
+#include "http11_parser.h"
+
+#ifndef RSTRING_PTR
+#define RSTRING_PTR(s) (RSTRING(s)->ptr)
+#endif
+#ifndef RSTRING_LEN
+#define RSTRING_LEN(s) (RSTRING(s)->len)
+#endif
+
+static VALUE mUnicorn;
+static VALUE cHttpParser;
+static VALUE eHttpParserError;
+
+#define id_handler_map rb_intern("@handler_map")
+#define HTTP_PREFIX "HTTP_"
+#define HTTP_PREFIX_LEN (sizeof(HTTP_PREFIX) - 1)
+
+static VALUE global_request_method;
+static VALUE global_request_uri;
+static VALUE global_fragment;
+static VALUE global_query_string;
+static VALUE global_http_version;
+static VALUE global_content_length;
+static VALUE global_http_content_length;
+static VALUE global_request_path;
+static VALUE global_content_type;
+static VALUE global_http_content_type;
+static VALUE global_http_body;
+static VALUE global_gateway_interface;
+static VALUE global_gateway_interface_value;
+static VALUE global_server_name;
+static VALUE global_server_port;
+static VALUE global_server_protocol;
+static VALUE global_server_protocol_value;
+static VALUE global_http_host;
+static VALUE global_port_80;
+static VALUE global_localhost;
+
+#define TRIE_INCREASE 30
+
+/** Defines common length and error messages for input length validation. */
+#define DEF_MAX_LENGTH(N,length) const size_t MAX_##N##_LENGTH = length; const char *MAX_##N##_LENGTH_ERR = "HTTP element " # N  " is longer than the " # length " allowed length."
+
+/** Validates the max length of given input and throws an HttpParserError exception if over. */
+#define VALIDATE_MAX_LENGTH(len, N) if(len > MAX_##N##_LENGTH) { rb_raise(eHttpParserError, MAX_##N##_LENGTH_ERR); }
+
+/** Defines global strings in the init method. */
+#define DEF_GLOBAL(N, val)   global_##N = rb_obj_freeze(rb_str_new2(val)); rb_global_variable(&global_##N)
+
+
+/* Defines the maximum allowed lengths for various input elements.*/
+DEF_MAX_LENGTH(FIELD_NAME, 256);
+DEF_MAX_LENGTH(FIELD_VALUE, 80 * 1024);
+DEF_MAX_LENGTH(REQUEST_URI, 1024 * 12);
+DEF_MAX_LENGTH(FRAGMENT, 1024); /* Don't know if this length is specified somewhere or not */
+DEF_MAX_LENGTH(REQUEST_PATH, 1024);
+DEF_MAX_LENGTH(QUERY_STRING, (1024 * 10));
+DEF_MAX_LENGTH(HEADER, (1024 * (80 + 32)));
+
+struct common_field {
+        const signed long len;
+        const char *name;
+        VALUE value;
+};
+
+/*
+ * A list of common HTTP headers we expect to receive.
+ * This allows us to avoid repeatedly creating identical string
+ * objects to be used with rb_hash_aset().
+ */
+static struct common_field common_http_fields[] = {
+# define f(N) { (sizeof(N) - 1), N, Qnil }
+        f("ACCEPT"),
+        f("ACCEPT_CHARSET"),
+        f("ACCEPT_ENCODING"),
+        f("ACCEPT_LANGUAGE"),
+        f("ALLOW"),
+        f("AUTHORIZATION"),
+        f("CACHE_CONTROL"),
+        f("CONNECTION"),
+        f("CONTENT_ENCODING"),
+        f("CONTENT_LENGTH"),
+        f("CONTENT_TYPE"),
+        f("COOKIE"),
+        f("DATE"),
+        f("EXPECT"),
+        f("FROM"),
+        f("HOST"),
+        f("IF_MATCH"),
+        f("IF_MODIFIED_SINCE"),
+        f("IF_NONE_MATCH"),
+        f("IF_RANGE"),
+        f("IF_UNMODIFIED_SINCE"),
+        f("KEEP_ALIVE"), /* Firefox sends this */
+        f("MAX_FORWARDS"),
+        f("PRAGMA"),
+        f("PROXY_AUTHORIZATION"),
+        f("RANGE"),
+        f("REFERER"),
+        f("TE"),
+        f("TRAILER"),
+        f("TRANSFER_ENCODING"),
+        f("UPGRADE"),
+        f("USER_AGENT"),
+        f("VIA"),
+        f("X_FORWARDED_FOR"), /* common for proxies */
+        f("X_REAL_IP"), /* common for proxies */
+        f("WARNING")
+# undef f
+};
+
+/*
+ * qsort(3) and bsearch(3) improve average performance slightly, but may
+ * not be worth it for lack of portability to certain platforms...
+ */
+#if defined(HAVE_QSORT_BSEARCH)
+/* sort by length, then by name if there's a tie */
+static int common_field_cmp(const void *a, const void *b)
+{
+  struct common_field *cfa = (struct common_field *)a;
+  struct common_field *cfb = (struct common_field *)b;
+  signed long diff = cfa->len - cfb->len;
+  return diff ? diff : memcmp(cfa->name, cfb->name, cfa->len);
+}
+#endif /* HAVE_QSORT_BSEARCH */
+
+static void init_common_fields(void)
+{
+  int i;
+  struct common_field *cf = common_http_fields;
+  char tmp[256]; /* MAX_FIELD_NAME_LENGTH */
+  memcpy(tmp, HTTP_PREFIX, HTTP_PREFIX_LEN);
+
+  for(i = 0; i < ARRAY_SIZE(common_http_fields); cf++, i++) {
+    memcpy(tmp + HTTP_PREFIX_LEN, cf->name, cf->len + 1);
+    cf->value = rb_obj_freeze(rb_str_new(tmp, HTTP_PREFIX_LEN + cf->len));
+    rb_global_variable(&cf->value);
+  }
+
+#if defined(HAVE_QSORT_BSEARCH)
+  qsort(common_http_fields,
+        ARRAY_SIZE(common_http_fields),
+        sizeof(struct common_field),
+        common_field_cmp);
+#endif /* HAVE_QSORT_BSEARCH */
+}
+
+static VALUE find_common_field_value(const char *field, size_t flen)
+{
+#if defined(HAVE_QSORT_BSEARCH)
+  struct common_field key;
+  struct common_field *found;
+  key.name = field;
+  key.len = (signed long)flen;
+  found = (struct common_field *)bsearch(&key, common_http_fields,
+                                         ARRAY_SIZE(common_http_fields),
+                                         sizeof(struct common_field),
+                                         common_field_cmp);
+  return found ? found->value : Qnil;
+#else /* !HAVE_QSORT_BSEARCH */
+  int i;
+  struct common_field *cf = common_http_fields;
+  for(i = 0; i < ARRAY_SIZE(common_http_fields); i++, cf++) {
+    if (cf->len == flen && !memcmp(cf->name, field, flen))
+      return cf->value;
+  }
+  return Qnil;
+#endif /* !HAVE_QSORT_BSEARCH */
+}
+
+void http_field(void *data, const char *field, size_t flen, const char *value, size_t vlen)
+{
+  VALUE req = (VALUE)data;
+  VALUE v = Qnil;
+  VALUE f = Qnil;
+
+  VALIDATE_MAX_LENGTH(flen, FIELD_NAME);
+  VALIDATE_MAX_LENGTH(vlen, FIELD_VALUE);
+
+  v = rb_str_new(value, vlen);
+
+  f = find_common_field_value(field, flen);
+
+  if (f == Qnil) {
+    /*
+     * We got a strange header that we don't have a memoized value for.
+     * Fallback to creating a new string to use as a hash key.
+     *
+     * using rb_str_new(NULL, len) here is faster than rb_str_buf_new(len)
+     * in my testing, because: there's no minimum allocation length (and
+     * no check for it, either), RSTRING_LEN(f) does not need to be
+     * written twice, and and RSTRING_PTR(f) will already be
+     * null-terminated for us.
+     */
+    f = rb_str_new(NULL, HTTP_PREFIX_LEN + flen);
+    memcpy(RSTRING_PTR(f), HTTP_PREFIX, HTTP_PREFIX_LEN);
+    memcpy(RSTRING_PTR(f) + HTTP_PREFIX_LEN, field, flen);
+    assert(*(RSTRING_PTR(f) + RSTRING_LEN(f)) == '\0'); /* paranoia */
+    /* fprintf(stderr, "UNKNOWN HEADER <%s>\n", RSTRING_PTR(f)); */
+  }
+
+  rb_hash_aset(req, f, v);
+}
+
+void request_method(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE val = Qnil;
+
+  val = rb_str_new(at, length);
+  rb_hash_aset(req, global_request_method, val);
+}
+
+void request_uri(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE val = Qnil;
+
+  VALIDATE_MAX_LENGTH(length, REQUEST_URI);
+
+  val = rb_str_new(at, length);
+  rb_hash_aset(req, global_request_uri, val);
+}
+
+void fragment(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE val = Qnil;
+
+  VALIDATE_MAX_LENGTH(length, FRAGMENT);
+
+  val = rb_str_new(at, length);
+  rb_hash_aset(req, global_fragment, val);
+}
+
+void request_path(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE val = Qnil;
+
+  VALIDATE_MAX_LENGTH(length, REQUEST_PATH);
+
+  val = rb_str_new(at, length);
+  rb_hash_aset(req, global_request_path, val);
+}
+
+void query_string(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE val = Qnil;
+
+  VALIDATE_MAX_LENGTH(length, QUERY_STRING);
+
+  val = rb_str_new(at, length);
+  rb_hash_aset(req, global_query_string, val);
+}
+
+void http_version(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE val = rb_str_new(at, length);
+  rb_hash_aset(req, global_http_version, val);
+}
+
+/** Finalizes the request header to have a bunch of stuff that's
+  needed. */
+
+void header_done(void *data, const char *at, size_t length)
+{
+  VALUE req = (VALUE)data;
+  VALUE temp = Qnil;
+  VALUE ctype = Qnil;
+  VALUE clen = Qnil;
+  char *colon = NULL;
+
+  clen = rb_hash_aref(req, global_http_content_length);
+  if(clen != Qnil) {
+    rb_hash_aset(req, global_content_length, clen);
+  }
+
+  ctype = rb_hash_aref(req, global_http_content_type);
+  if(ctype != Qnil) {
+    rb_hash_aset(req, global_content_type, ctype);
+  }
+
+  rb_hash_aset(req, global_gateway_interface, global_gateway_interface_value);
+  if((temp = rb_hash_aref(req, global_http_host)) != Qnil) {
+    colon = memchr(RSTRING_PTR(temp), ':', RSTRING_LEN(temp));
+    if(colon != NULL) {
+      rb_hash_aset(req, global_server_name, rb_str_substr(temp, 0, colon - RSTRING_PTR(temp)));
+      rb_hash_aset(req, global_server_port, 
+          rb_str_substr(temp, colon - RSTRING_PTR(temp)+1, 
+            RSTRING_LEN(temp)));
+    } else {
+      rb_hash_aset(req, global_server_name, temp);
+      rb_hash_aset(req, global_server_port, global_port_80);
+    }
+  } else {
+    rb_hash_aset(req, global_server_name, global_localhost);
+    rb_hash_aset(req, global_server_port, global_port_80);
+  }
+
+  /* grab the initial body and stuff it into the hash */
+  rb_hash_aset(req, global_http_body, rb_str_new(at, length));
+  rb_hash_aset(req, global_server_protocol, global_server_protocol_value);
+}
+
+
+void HttpParser_free(void *data) {
+  TRACE();
+
+  if(data) {
+    free(data);
+  }
+}
+
+
+VALUE HttpParser_alloc(VALUE klass)
+{
+  VALUE obj;
+  http_parser *hp = ALLOC_N(http_parser, 1);
+  TRACE();
+  hp->http_field = http_field;
+  hp->request_method = request_method;
+  hp->request_uri = request_uri;
+  hp->fragment = fragment;
+  hp->request_path = request_path;
+  hp->query_string = query_string;
+  hp->http_version = http_version;
+  hp->header_done = header_done;
+  http_parser_init(hp);
+
+  obj = Data_Wrap_Struct(klass, NULL, HttpParser_free, hp);
+
+  return obj;
+}
+
+
+/**
+ * call-seq:
+ *    parser.new -> parser
+ *
+ * Creates a new parser.
+ */
+VALUE HttpParser_init(VALUE self)
+{
+  http_parser *http = NULL;
+  DATA_GET(self, http_parser, http);
+  http_parser_init(http);
+
+  return self;
+}
+
+
+/**
+ * call-seq:
+ *    parser.reset -> nil
+ *
+ * Resets the parser to it's initial state so that you can reuse it
+ * rather than making new ones.
+ */
+VALUE HttpParser_reset(VALUE self)
+{
+  http_parser *http = NULL;
+  DATA_GET(self, http_parser, http);
+  http_parser_init(http);
+
+  return Qnil;
+}
+
+
+/**
+ * call-seq:
+ *    parser.finish -> true/false
+ *
+ * Finishes a parser early which could put in a "good" or bad state.
+ * You should call reset after finish it or bad things will happen.
+ */
+VALUE HttpParser_finish(VALUE self)
+{
+  http_parser *http = NULL;
+  DATA_GET(self, http_parser, http);
+  http_parser_finish(http);
+
+  return http_parser_is_finished(http) ? Qtrue : Qfalse;
+}
+
+
+/**
+ * call-seq:
+ *    parser.execute(req_hash, data, start) -> Integer
+ *
+ * Takes a Hash and a String of data, parses the String of data filling in the Hash
+ * returning an Integer to indicate how much of the data has been read.  No matter
+ * what the return value, you should call HttpParser#finished? and HttpParser#error?
+ * to figure out if it's done parsing or there was an error.
+ * 
+ * This function now throws an exception when there is a parsing error.  This makes 
+ * the logic for working with the parser much easier.  You can still test for an 
+ * error, but now you need to wrap the parser with an exception handling block.
+ *
+ * The third argument allows for parsing a partial request and then continuing
+ * the parsing from that position.  It needs all of the original data as well 
+ * so you have to append to the data buffer as you read.
+ */
+VALUE HttpParser_execute(VALUE self, VALUE req_hash, VALUE data, VALUE start)
+{
+  http_parser *http = NULL;
+  int from = 0;
+  char *dptr = NULL;
+  long dlen = 0;
+
+  DATA_GET(self, http_parser, http);
+
+  from = FIX2INT(start);
+  dptr = RSTRING_PTR(data);
+  dlen = RSTRING_LEN(data);
+
+  if(from >= dlen) {
+    rb_raise(eHttpParserError, "Requested start is after data buffer end.");
+  } else {
+    http->data = (void *)req_hash;
+    http_parser_execute(http, dptr, dlen, from);
+
+    VALIDATE_MAX_LENGTH(http_parser_nread(http), HEADER);
+
+    if(http_parser_has_error(http)) {
+      rb_raise(eHttpParserError, "Invalid HTTP format, parsing fails.");
+    } else {
+      return INT2FIX(http_parser_nread(http));
+    }
+  }
+}
+
+
+
+/**
+ * call-seq:
+ *    parser.error? -> true/false
+ *
+ * Tells you whether the parser is in an error state.
+ */
+VALUE HttpParser_has_error(VALUE self)
+{
+  http_parser *http = NULL;
+  DATA_GET(self, http_parser, http);
+
+  return http_parser_has_error(http) ? Qtrue : Qfalse;
+}
+
+
+/**
+ * call-seq:
+ *    parser.finished? -> true/false
+ *
+ * Tells you whether the parser is finished or not and in a good state.
+ */
+VALUE HttpParser_is_finished(VALUE self)
+{
+  http_parser *http = NULL;
+  DATA_GET(self, http_parser, http);
+
+  return http_parser_is_finished(http) ? Qtrue : Qfalse;
+}
+
+
+/**
+ * call-seq:
+ *    parser.nread -> Integer
+ *
+ * Returns the amount of data processed so far during this processing cycle.  It is
+ * set to 0 on initialize or reset calls and is incremented each time execute is called.
+ */
+VALUE HttpParser_nread(VALUE self)
+{
+  http_parser *http = NULL;
+  DATA_GET(self, http_parser, http);
+
+  return INT2FIX(http->nread);
+}
+
+void Init_http11()
+{
+
+  mUnicorn = rb_define_module("Unicorn");
+
+  DEF_GLOBAL(request_method, "REQUEST_METHOD");
+  DEF_GLOBAL(request_uri, "REQUEST_URI");
+  DEF_GLOBAL(fragment, "FRAGMENT");
+  DEF_GLOBAL(query_string, "QUERY_STRING");
+  DEF_GLOBAL(http_version, "HTTP_VERSION");
+  DEF_GLOBAL(request_path, "REQUEST_PATH");
+  DEF_GLOBAL(content_length, "CONTENT_LENGTH");
+  DEF_GLOBAL(http_content_length, "HTTP_CONTENT_LENGTH");
+  DEF_GLOBAL(http_body, "HTTP_BODY");
+  DEF_GLOBAL(content_type, "CONTENT_TYPE");
+  DEF_GLOBAL(http_content_type, "HTTP_CONTENT_TYPE");
+  DEF_GLOBAL(gateway_interface, "GATEWAY_INTERFACE");
+  DEF_GLOBAL(gateway_interface_value, "CGI/1.2");
+  DEF_GLOBAL(server_name, "SERVER_NAME");
+  DEF_GLOBAL(server_port, "SERVER_PORT");
+  DEF_GLOBAL(server_protocol, "SERVER_PROTOCOL");
+  DEF_GLOBAL(server_protocol_value, "HTTP/1.1");
+  DEF_GLOBAL(http_host, "HTTP_HOST");
+  DEF_GLOBAL(port_80, "80");
+  DEF_GLOBAL(localhost, "localhost");
+
+  eHttpParserError = rb_define_class_under(mUnicorn, "HttpParserError", rb_eIOError);
+
+  cHttpParser = rb_define_class_under(mUnicorn, "HttpParser", rb_cObject);
+  rb_define_alloc_func(cHttpParser, HttpParser_alloc);
+  rb_define_method(cHttpParser, "initialize", HttpParser_init,0);
+  rb_define_method(cHttpParser, "reset", HttpParser_reset,0);
+  rb_define_method(cHttpParser, "finish", HttpParser_finish,0);
+  rb_define_method(cHttpParser, "execute", HttpParser_execute,3);
+  rb_define_method(cHttpParser, "error?", HttpParser_has_error,0);
+  rb_define_method(cHttpParser, "finished?", HttpParser_is_finished,0);
+  rb_define_method(cHttpParser, "nread", HttpParser_nread,0);
+  init_common_fields();
+}