Add checking capability to MD5 (bug #3619)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5053 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_md5.c

@@ -12,6 +12,7 @@
 #include <asterisk/file.h>
 #include <asterisk/logger.h>
 #include <asterisk/utils.h>
+#include <asterisk/options.h>
 #include <asterisk/channel.h>
 #include <asterisk/pbx.h>
 #include <asterisk/module.h>
@@ -20,16 +21,25 @@
 #include <unistd.h>
 #include <string.h>
 
-static char *tdesc = "MD5 checksum application";
-static char *app_md5 = "md5";
-static char *synopsis = 
-"  md5(<var>=<string>): Calculates a MD5 checksum on <string>.\n"
+static char *tdesc_md5 = "MD5 checksum application";
+static char *app_md5 = "MD5";
+static char *synopsis_md5 = 
+"  MD5(<var>=<string>): Calculates a MD5 checksum on <string>.\n"
 "Returns hash value in a channel variable. Always return 0\n";
 
+static char *tdesc_md5check = "MD5 checksum verification application";
+static char *app_md5check = "MD5Check";
+static char *synopsis_md5check = 
+"  MD5Check(<md5hash>,<string>): Calculates a MD5 checksum on <string>\n"
+"and compares it with the hash. Returns 0 if <md5hash> is correct for <string>.\n"
+"Jumps to priority+101 if incorrect.\n";
+
 STANDARD_LOCAL_USER;
 
 LOCAL_USER_DECL;
 
+/*--- md5_exec: Calculate MD5 checksum (hash) on given string and
+	return it in channel variable ---*/
 static int md5_exec(struct ast_channel *chan, void *data)
 {
 	int res=0;
@@ -57,20 +67,69 @@ static int md5_exec(struct ast_channel *chan, void *data)
 	return res;
 }
 
+/*--- md5check_exec: Calculate MD5 checksum and compare it with
+	existing checksum. ---*/
+static int md5check_exec(struct ast_channel *chan, void *data)
+{
+	int res=0;
+	struct localuser *u;
+	char *hash= NULL; /* Hash to compare with */
+	char *string = NULL; /* String to calculate on */
+	char newhash[50]; /* Return value */
+
+	if (!data) {
+		ast_log(LOG_WARNING, "Syntax: MD5Check(<md5hash>,<string>) - missing argument!\n");
+		return -1;
+	}
+	LOCAL_USER_ADD(u);
+	memset(newhash,0, sizeof(newhash));
+
+	string = ast_strdupa(data);
+	hash = strsep(&string,"|");
+	if (ast_strlen_zero(hash)) {
+		ast_log(LOG_WARNING, "Syntax: MD5Check(<md5hash>,<string>) - missing argument!\n");
+		LOCAL_USER_REMOVE(u);
+		return -1;
+	}
+	ast_md5_hash(newhash, string);
+	if (!strcmp(newhash, hash)) {	/* Verification ok */
+		if (option_debug > 2)
+			ast_log(LOG_DEBUG, "MD5 verified ok: %s -- %s\n", hash, string);
+		LOCAL_USER_REMOVE(u);
+		return 0;
+	}
+	if (option_debug > 2)
+		ast_log(LOG_DEBUG, "ERROR: MD5 not verified: %s -- %s\n", hash, string);
+	if (ast_exists_extension(chan, chan->context, chan->exten, chan->priority + 101, chan->cid.cid_num))
+		chan->priority += 100;
+	else if (option_debug > 2)
+		ast_log(LOG_DEBUG, "ERROR: Can't jump to exten+101 (e%s,p%d), sorry\n", chan->exten,chan->priority+101);
+	LOCAL_USER_REMOVE(u);
+	return res;
+}
+
 int unload_module(void)
 {
+	int res;
+
 	STANDARD_HANGUP_LOCALUSERS;
-	return ast_unregister_application(app_md5);
+	res =ast_unregister_application(app_md5);
+	res |= ast_unregister_application(app_md5check);
+	return res;
 }
 
 int load_module(void)
 {
-	return ast_register_application(app_md5, md5_exec, synopsis, tdesc);
+	int res;
+
+	res = ast_register_application(app_md5check, md5check_exec, synopsis_md5check, tdesc_md5check);
+	res |= ast_register_application(app_md5, md5_exec, synopsis_md5, tdesc_md5);
+	return res;
 }
 
 char *description(void)
 {
-	return tdesc;
+	return tdesc_md5;
 }
 
 int usecount(void)