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Listing 13-17. Using a Wrapper from a C# Assembly // Program.cs using System; using System.Collections.Generic; using System.Text; class Program { static void Main(string[] args) { MessageBoxWrapper wrapper = new MessageBoxWrapper("I hope you love this message box!", "C# using Native Message Box", MessageBoxTypeEnum.OKCANCEL); wrapper.Display(); } } A successful wrapper layer will likely involve a lot of conversions between native and managed types. How you handle these conversions can involve a surprising amount of code and have a big impact on the performance of the wrapper class system. When writing managed code that calls into native code frequently in a tight loop, you need to be particularly careful to minimize transitions. Consider the code in Listing 13-18, which demonstrates the performance effect of native to managed transitions. It also demonstrates the use of #pragma to include both native and managed code in the same file. In this case, everything after #pragma unmanaged and before #pragma managed is interpreted as native code. No managed constructs are allowed there. By moving these pragmas around in code, you can see what the effects are of having various portions of the code native or managed. Listing 13-18. Using #pragma managed and #pragma unmanaged // context_switch.cpp #include <stdio.h> #include <time.h> #include <stdlib.h> #include <math.h> #include <string.h> #pragma unmanaged int native_function(wchar_t* str1, wchar_t* str2 ) { int i = 0; while (*str1++ = *str2++) i++; return i; } #pragma managed

Now we are ready to look at how to build our own rules. The most basic options we can specify are the source address and destination address. These are specified with s and d, respectively. Each of these parameters can be specified as a single IPv4 address or IPv4 subnet. You should not use DNS names, as the DNS may not be operating when the firewall is started. If necessary you can also negate an address, to allow traffic from everywhere except the specified address. Listing 10-4 shows some examples of how to match a source address. If possible you should avoid using the negate syntax because it can be confusing to read. The same result can often be achieved by matching the address but using a different target. Targets are covered later in the chapter. Listing 10-4. An Example of Address Matching s 192.168.3.20 # packet sent from a single host s 192.168.3.0/24 # packet sent from any host on the subnet s ! 10.0.0.0/8 # packet has sent from a host not on the subnet For a simple host, specifying the source address is adequate to implement the firewall. A server that is acting as a router has a more complex network setup, and it may be required to specify a destination address as well. This will be covered in more detail later.

To see the final part of the application at work, you need an approved order. 1. Open the ApprovalWaiting folder and edit the XML file so that the status is Approved: < xml version="1.0" encoding="utf-8" ><Order> <OrderID>101</OrderID> <ProductID>A0B111222</ProductID> <OrderQuantity>1</OrderQuantity> <ProductPrice>1499.99</ProductPrice> <Status>Approved</Status> </Order>

Tip: The ! character has a special meaning to the Bash shell and performs history substitution. Although it is

wchar_t* random_string(wchar_t* wcs, int n) { for (int i = 0; i < n - 1; i++) { wcs[i] = (wchar_t) floor(((double) rand() / (double) RAND_MAX * 26)) + L'A'; } return wcs; } // Try commenting out the pragma above random_string and uncomment this: // #pragma managed. int main() { wchar_t wcs1[100]; wchar_t* wcs2 = new wchar_t[100]; memset(wcs1, 0, 100 * sizeof(wchar_t)); clock_t t = clock(); const int num_iter = 100000; for (int i = 0; i < num_iter; i++) { random_string(wcs1, 100); native_function(wcs2, wcs1); } double time_elapsed = (clock()-t)/(double)CLOCKS_PER_SEC; printf("total time elapsed: %2.2f seconds\n", time_elapsed); } On my system, when I execute the code in Listing 13-18 with native_function as native code and random_string as managed code, the execution time is 1.3 seconds. On the other hand, if both native_code and random_string are made native by moving the comment as suggested, we can avoid the transition on each loop and the execution time gets down to .73 seconds, which is just as fast (at least to two decimal places) as fully native code compiled with /O2, also .73 seconds.

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