Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 336 insertions, 0 deletions

diff --git a/src/global/mynetworks.c b/src/global/mynetworks.c
new file mode 100644
index 0000000..007c046
--- /dev/null
+++ b/src/global/mynetworks.c
@@ -0,0 +1,336 @@
+/*++
+/* NAME
+/*	mynetworks 3
+/* SUMMARY
+/*	generate patterns for my own interface addresses
+/* SYNOPSIS
+/*	#include <mynetworks.h>
+/*
+/*	const char *mynetworks()
+/* AUXILIARY FUNCTIONS
+/*	const char *mynetworks_host()
+/* DESCRIPTION
+/*	This routine uses the address list built by own_inet_addr()
+/*	to produce a list of patterns that match the corresponding
+/*	networks.
+/*
+/*	The interface list is specified with the "inet_interfaces"
+/*	configuration parameter.
+/*
+/*	The address to netblock conversion style is specified with
+/*	the "mynetworks_style" parameter: one of "class" (match
+/*	whole class A, B, C or D networks), "subnet" (match local
+/*	subnets), or "host" (match local interfaces only).
+/*
+/*	mynetworks_host() uses the "host" style.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Dean C. Strik
+/*	Department ICT Services
+/*	Eindhoven University of Technology
+/*	P.O. Box 513
+/*	5600 MB  Eindhoven, Netherlands
+/*	E-mail: <dean@ipnet6.org>
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#ifndef IN_CLASSD_NET
+#define IN_CLASSD_NET		0xf0000000
+#define IN_CLASSD_NSHIFT 	28
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <inet_addr_list.h>
+#include <name_mask.h>
+#include <myaddrinfo.h>
+#include <mask_addr.h>
+#include <argv.h>
+#include <inet_proto.h>
+#include <mymalloc.h>
+
+/* Global library. */
+
+#include <own_inet_addr.h>
+#include <mail_params.h>
+#include <mynetworks.h>
+#include <sock_addr.h>
+#include <been_here.h>
+
+/* Application-specific. */
+
+#define MASK_STYLE_CLASS	(1 << 0)
+#define MASK_STYLE_SUBNET	(1 << 1)
+#define MASK_STYLE_HOST		(1 << 2)
+
+static const NAME_MASK mask_styles[] = {
+    MYNETWORKS_STYLE_CLASS, MASK_STYLE_CLASS,
+    MYNETWORKS_STYLE_SUBNET, MASK_STYLE_SUBNET,
+    MYNETWORKS_STYLE_HOST, MASK_STYLE_HOST,
+    0,
+};
+
+/* mynetworks_core - return patterns for specific mynetworks style */
+
+static const char *mynetworks_core(const char *style)
+{
+    const char *myname = "mynetworks_core";
+    VSTRING *result;
+    INET_ADDR_LIST *my_addr_list;
+    INET_ADDR_LIST *my_mask_list;
+    unsigned shift;
+    unsigned junk;
+    int     i;
+    unsigned mask_style;
+    struct sockaddr_storage *sa;
+    struct sockaddr_storage *ma;
+    int     net_mask_count = 0;
+    ARGV   *argv;
+    BH_TABLE *dup_filter;
+    char  **cpp;
+
+    /*
+     * Avoid run-time errors when all network protocols are disabled. We
+     * can't look up interface information, and we can't convert explicit
+     * names or addresses.
+     */
+    if (inet_proto_info()->ai_family_list[0] == 0) {
+	if (msg_verbose)
+	    msg_info("skipping %s setting - "
+		     "all network protocols are disabled",
+		     VAR_MYNETWORKS);
+	return (mystrdup(""));
+    }
+    mask_style = name_mask("mynetworks mask style", mask_styles, style);
+
+    /*
+     * XXX Workaround: name_mask() needs a flags argument so that we can
+     * require exactly one value, or we need to provide an API that is
+     * dedicated for single-valued flags.
+     * 
+     * XXX Why not use name_code() instead?
+     */
+    for (i = 0, junk = mask_style; junk != 0; junk >>= 1U)
+	i += (junk & 1);
+    if (i != 1)
+	msg_fatal("bad %s value: %s; specify exactly one value",
+		  VAR_MYNETWORKS_STYLE, var_mynetworks_style);
+
+    result = vstring_alloc(20);
+    my_addr_list = own_inet_addr_list();
+    my_mask_list = own_inet_mask_list();
+
+    for (sa = my_addr_list->addrs, ma = my_mask_list->addrs;
+	 sa < my_addr_list->addrs + my_addr_list->used;
+	 sa++, ma++) {
+	unsigned long addr;
+	unsigned long mask;
+	struct in_addr net;
+
+	if (SOCK_ADDR_FAMILY(sa) == AF_INET) {
+	    addr = ntohl(SOCK_ADDR_IN_ADDR(sa).s_addr);
+	    mask = ntohl(SOCK_ADDR_IN_ADDR(ma).s_addr);
+
+	    switch (mask_style) {
+
+		/*
+		 * Natural mask. This is dangerous if you're customer of an
+		 * ISP who gave you a small portion of their network.
+		 */
+	    case MASK_STYLE_CLASS:
+		if (IN_CLASSA(addr)) {
+		    mask = IN_CLASSA_NET;
+		    shift = IN_CLASSA_NSHIFT;
+		} else if (IN_CLASSB(addr)) {
+		    mask = IN_CLASSB_NET;
+		    shift = IN_CLASSB_NSHIFT;
+		} else if (IN_CLASSC(addr)) {
+		    mask = IN_CLASSC_NET;
+		    shift = IN_CLASSC_NSHIFT;
+		} else if (IN_CLASSD(addr)) {
+		    mask = IN_CLASSD_NET;
+		    shift = IN_CLASSD_NSHIFT;
+		} else {
+		    msg_fatal("%s: unknown address class: %s",
+			      myname, inet_ntoa(SOCK_ADDR_IN_ADDR(sa)));
+		}
+		break;
+
+		/*
+		 * Subnet mask. This is less unsafe, but still bad if you're
+		 * connected to a large subnet.
+		 */
+	    case MASK_STYLE_SUBNET:
+		for (junk = mask, shift = MAI_V4ADDR_BITS; junk != 0;
+		     shift--, junk <<= 1)
+		     /* void */ ;
+		break;
+
+		/*
+		 * Host only. Do not relay authorize other hosts.
+		 */
+	    case MASK_STYLE_HOST:
+		mask = ~0UL;
+		shift = 0;
+		break;
+
+	    default:
+		msg_panic("unknown mynetworks mask style: %s",
+			  var_mynetworks_style);
+	    }
+	    net.s_addr = htonl(addr & mask);
+	    vstring_sprintf_append(result, "%s/%d ",
+				   inet_ntoa(net), MAI_V4ADDR_BITS - shift);
+	    net_mask_count++;
+	    continue;
+	}
+#ifdef HAS_IPV6
+	else if (SOCK_ADDR_FAMILY(sa) == AF_INET6) {
+	    MAI_HOSTADDR_STR hostaddr;
+	    unsigned char *ac;
+	    unsigned char *end;
+	    unsigned char ch;
+	    struct sockaddr_in6 net6;
+
+	    switch (mask_style) {
+
+		/*
+		 * There are no classes for IPv6. We default to subnets
+		 * instead.
+		 */
+	    case MASK_STYLE_CLASS:
+
+		/* FALLTHROUGH */
+
+		/*
+		 * Subnet mask.
+		 */
+	    case MASK_STYLE_SUBNET:
+		ac = (unsigned char *) &SOCK_ADDR_IN6_ADDR(ma);
+		end = ac + sizeof(SOCK_ADDR_IN6_ADDR(ma));
+		shift = MAI_V6ADDR_BITS;
+		while (ac < end) {
+		    if ((ch = *ac++) == (unsigned char) ~0U) {
+			shift -= CHAR_BIT;
+			continue;
+		    } else {
+			while (ch != 0)
+			    shift--, ch <<= 1;
+			break;
+		    }
+		}
+		break;
+
+		/*
+		 * Host only. Do not relay authorize other hosts.
+		 */
+	    case MASK_STYLE_HOST:
+		shift = 0;
+		break;
+
+	    default:
+		msg_panic("unknown mynetworks mask style: %s",
+			  var_mynetworks_style);
+	    }
+	    /* FIX 200501: IPv6 patch did not clear host bits. */
+	    net6 = *SOCK_ADDR_IN6_PTR(sa);
+	    mask_addr((unsigned char *) &net6.sin6_addr,
+		      sizeof(net6.sin6_addr),
+		      MAI_V6ADDR_BITS - shift);
+	    SOCKADDR_TO_HOSTADDR(SOCK_ADDR_PTR(&net6), SOCK_ADDR_LEN(&net6),
+				 &hostaddr, (MAI_SERVPORT_STR *) 0, 0);
+	    vstring_sprintf_append(result, "[%s]/%d ",
+				   hostaddr.buf, MAI_V6ADDR_BITS - shift);
+	    net_mask_count++;
+	    continue;
+	}
+#endif
+	else {
+	    msg_warn("%s: skipping unknown address family %d",
+		     myname, SOCK_ADDR_FAMILY(sa));
+	    continue;
+	}
+    }
+
+    /*
+     * FIX 200501 IPv6 patch produced repeated results. Some systems report
+     * the same interface multiple times, notably multi-homed systems with
+     * IPv6 link-local or site-local addresses. A straight-forward sort+uniq
+     * produces ugly results, though. Instead we preserve the original order
+     * and use a duplicate filter to suppress repeated information.
+     */
+    if (net_mask_count > 1) {
+	argv = argv_split(vstring_str(result), " ");
+	VSTRING_RESET(result);
+	dup_filter = been_here_init(net_mask_count, BH_FLAG_NONE);
+	for (cpp = argv->argv; cpp < argv->argv + argv->argc; cpp++)
+	    if (!been_here_fixed(dup_filter, *cpp))
+		vstring_sprintf_append(result, "%s ", *cpp);
+	argv_free(argv);
+	been_here_free(dup_filter);
+    }
+    if (msg_verbose)
+	msg_info("%s: %s", myname, vstring_str(result));
+    return (vstring_export(result));
+}
+
+/* mynetworks - return patterns that match my own networks */
+
+const char *mynetworks(void)
+{
+    static const char *result;
+
+    if (result == 0)
+	result = mynetworks_core(var_mynetworks_style);
+    return (result);
+}
+
+/* mynetworks_host - return patterns for "host" mynetworks style */
+
+const char *mynetworks_host(void)
+{
+    static const char *result;
+
+    if (result == 0)
+	result = mynetworks_core(MYNETWORKS_STYLE_HOST);
+    return (result);
+}
+
+#ifdef TEST
+#include <inet_proto.h>
+
+char   *var_inet_interfaces;
+char   *var_mynetworks_style;
+
+int     main(int argc, char **argv)
+{
+    INET_PROTO_INFO *proto_info;
+
+    if (argc != 4)
+	msg_fatal("usage: %s protocols mask_style interface_list (e.g. \"all subnet all\")",
+		  argv[0]);
+    msg_verbose = 10;
+    proto_info = inet_proto_init(argv[0], argv[1]);
+    var_mynetworks_style = argv[2];
+    var_inet_interfaces = argv[3];
+    mynetworks();
+    return (0);
+}
+
+#endif