X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/8efc0c151a0f57612e1aa0abb5b7d536db4cf76a..c623936e2252567dff4ce9b4395977921e661c8f:/compat.c

diff --git a/compat.c b/compat.c
index bf4897e1..83340993 100644
--- a/compat.c
+++ b/compat.c
@@ -1,10 +1,138 @@
+/*
+ * Copyright (c) 1999,2000 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 #include "includes.h"
-RCSID("$Id$");
+RCSID("$OpenBSD: compat.c,v 1.34 2001/01/21 19:05:48 markus Exp $");
+
+#ifdef HAVE_LIBPCRE
+#  include <pcreposix.h>
+#else /* Use native regex libraries */
+#  ifdef HAVE_REGEX_H
+#    include <regex.h>
+#  else
+#    include "fake-regex.h"
+#  endif
+#endif /* HAVE_LIBPCRE */
+
+#include "packet.h"
+#include "xmalloc.h"
+#include "compat.h"
+#include "log.h"
+
+int compat13 = 0;
+int compat20 = 0;
+int datafellows = 0;
+
+void
+enable_compat20(void)
+{
+	verbose("Enabling compatibility mode for protocol 2.0");
+	compat20 = 1;
+}
+void
+enable_compat13(void)
+{
+	verbose("Enabling compatibility mode for protocol 1.3");
+	compat13 = 1;
+}
+/* datafellows bug compatibility */
+void
+compat_datafellows(const char *version)
+{
+	int i, ret;
+	char ebuf[1024];
+	regex_t reg;
+	static struct {
+		char	*pat;
+		int	bugs;
+	} check[] = {
+		{ "^OpenSSH[-_]2\\.[012]",
+					SSH_OLD_SESSIONID|SSH_BUG_BANNER },
+		{ "^OpenSSH_2\\.3\\.0", SSH_BUG_BANNER },
+		{ "^OpenSSH",		0 },
+		{ "MindTerm",		0 },
+		{ "^2\\.1\\.0",		SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+					SSH_OLD_SESSIONID|SSH_BUG_DEBUG },
+		{ "^2\\.0\\.1[3-9]",	SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+					SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
+					SSH_BUG_PKSERVICE|SSH_BUG_X11FWD },
+		{ "^2\\.0\\.",		SSH_BUG_SIGBLOB|SSH_BUG_HMAC|
+					SSH_OLD_SESSIONID|SSH_BUG_DEBUG|
+					SSH_BUG_PKSERVICE|SSH_BUG_X11FWD|
+					SSH_BUG_PKAUTH },
+		{ "^2\\.[23]\\.0",	SSH_BUG_HMAC},
+		{ "^2\\.[2-9]\\.",	0 },
+		{ "^2\\.4$",		SSH_OLD_SESSIONID}, /* Van Dyke */
+		{ "^3\\.0 SecureCRT",	SSH_OLD_SESSIONID},
+		{ "^1\\.7 SecureFX",	SSH_OLD_SESSIONID},
+		{ NULL,			0 }
+	};
+	/* process table, return first match */
+	for (i = 0; check[i].pat; i++) {
+		ret = regcomp(&reg, check[i].pat, REG_EXTENDED|REG_NOSUB);
+		if (ret != 0) {
+			regerror(ret, &reg, ebuf, sizeof(ebuf));
+			ebuf[sizeof(ebuf)-1] = '\0';
+			error("regerror: %s", ebuf);
+			continue;
+		}
+		ret = regexec(&reg, version, 0, NULL, 0);
+		regfree(&reg);
+		if (ret == 0) {
+			debug("match: %s pat %s", version, check[i].pat);
+			datafellows = check[i].bugs;
+			return;
+		}
+	}
+	debug("no match: %s", version);
+}
 
-#include "ssh.h"
+#define	SEP	","
+int
+proto_spec(const char *spec)
+{
+	char *s, *p, *q;
+	int ret = SSH_PROTO_UNKNOWN;
 
-int compat13=0;
-void enable_compat13(void){
-	log("Enabling compatibility mode for protocol 1.3");
-	compat13=1;
+	if (spec == NULL)
+		return ret;
+	q = s = xstrdup(spec);
+	for ((p = strsep(&q, SEP)); p && *p != '\0'; (p = strsep(&q, SEP))) {
+		switch(atoi(p)) {
+		case 1:
+			if (ret == SSH_PROTO_UNKNOWN)
+				ret |= SSH_PROTO_1_PREFERRED;
+			ret |= SSH_PROTO_1;
+			break;
+		case 2:
+			ret |= SSH_PROTO_2;
+			break;
+		default:
+			log("ignoring bad proto spec: '%s'.", p);
+			break;
+		}
+	}
+	xfree(s);
+	return ret;
 }