implemented a checksum_builder tool to build the checksum library

configure.in

@@ -1234,6 +1234,7 @@ AC_OUTPUT(
 	src/Makefile
 	src/include/Makefile
 	src/libstrongswan/Makefile
+	src/libstrongswan/checksum/Makefile
 	src/libstrongswan/plugins/aes/Makefile
 	src/libstrongswan/plugins/des/Makefile
 	src/libstrongswan/plugins/blowfish/Makefile

src/libstrongswan/Makefile.am

@@ -209,3 +209,5 @@ endif
 if USE_INTEGRITY_TEST
   SUBDIRS += fips
 endif
+
+SUBDIRS += checksum

src/libstrongswan/checksum/.gitignore

@@ -0,0 +1,2 @@
+checksum.c
+checksum_builder

src/libstrongswan/checksum/Makefile.am

@@ -0,0 +1,15 @@
+ipsec_LTLIBRARIES = libchecksum.la
+noinst_PROGRAMS = checksum_builder
+
+libchecksum_la_SOURCES = checksum.c
+
+checksum_builder_SOURCES = checksum_builder.c
+checksum_builder_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la
+
+BUILT_SOURCES = checksum.c
+CLEANFILES = checksum.c checksum_builder
+INCLUDES = -I$(top_srcdir)/src/libstrongswan
+
+checksum.c : checksum_builder
+		find $(top_builddir)/src/libstrongswan -name 'libstrongswan-*.so' \
+			| xargs ./checksum_builder > checksum.c

src/libstrongswan/checksum/checksum_builder.c

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil, Switzerland
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <dlfcn.h>
+
+#include <library.h>
+
+
+/* we need some faked symbols to load charon plugins */
+char *charon = "adsf";
+
+int main(int argc, char* argv[])
+{
+	int i;
+	integrity_checker_t *integrity;
+	
+	/* avoid confusing leak reports in build process */
+	setenv("LEAK_DETECTIVE_DISABLE", "1", 0);
+	library_init(NULL);
+	atexit(library_deinit);
+	
+	integrity = integrity_checker_create(NULL);
+	
+	printf("/**\n");
+	printf(" * checksums of files and loaded code segments.\n");
+	printf(" * created by %s\n", argv[0]);
+	printf(" */\n");
+	printf("\n");
+	printf("#include <library.h>\n");
+	printf("\n");
+	printf("integrity_checksum_t checksums[] = {\n");
+	for (i = 1; i < argc; i++)
+	{
+		char *name, *path, *sname;
+		void *handle, *symbol;
+		u_int32_t fsum, ssum;
+		
+		path = argv[i];
+		
+		if ((name = strstr(path, "libstrongswan-")))
+		{
+			name = strdup(name + strlen("libstrongswan-"));
+			name[strlen(name) - 3] = '"';
+			name[strlen(name) - 2] = ',';
+			name[strlen(name) - 1] = '\0';
+			sname = "plugin_create";
+		}
+		else if (strstr(path, "libstrongswan.so"))
+		{
+			name = strdup("libstrongswan\",");
+			sname = "library_init";
+		}
+		else
+		{
+			fprintf(stderr, "don't know how to handle '%s', ignored", path);
+			continue;
+		}
+		
+		fsum = integrity->build_file(integrity, path);
+		ssum = 0;
+		handle = dlopen(path, RTLD_GLOBAL|RTLD_NOW);
+		if (handle)
+		{
+			symbol = dlsym(handle, sname);
+			if (symbol)
+			{
+				ssum = integrity->build_segment(integrity, symbol);
+			}
+			else
+			{
+				fprintf(stderr, "symbol lookup failed: %s\n", dlerror());
+			}
+			dlclose(handle);
+		}
+		else
+		{
+			fprintf(stderr, "dlopen failed: %s\n", dlerror());
+		}
+		
+		printf("\t{\"%-20s0x%08x, 0x%08x},\n", name, fsum, ssum);
+		free(name);
+	}
+	printf("};\n");
+	printf("\n");
+	printf("int checksum_count = countof(checksums);\n");
+	printf("\n");
+	integrity->destroy(integrity);
+	
+	exit(0);
+}
+