Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 312 insertions, 0 deletions

diff --git a/src/util/match_ops.c b/src/util/match_ops.c
new file mode 100644
index 0000000..e0b7779
--- /dev/null
+++ b/src/util/match_ops.c
@@ -0,0 +1,312 @@
+/*++
+/* NAME
+/*	match_ops 3
+/* SUMMARY
+/*	simple string or host pattern matching
+/* SYNOPSIS
+/*	#include <match_list.h>
+/*
+/*	int	match_string(list, string, pattern)
+/*	MATCH_LIST *list;
+/*	const char *string;
+/*	const char *pattern;
+/*
+/*	int	match_hostname(list, name, pattern)
+/*	MATCH_LIST *list;
+/*	const char *name;
+/*	const char *pattern;
+/*
+/*	int	match_hostaddr(list, addr, pattern)
+/*	MATCH_LIST *list;
+/*	const char *addr;
+/*	const char *pattern;
+/* DESCRIPTION
+/*	This module implements simple string and host name or address
+/*	matching. The matching process is case insensitive. If a pattern
+/*	has the form type:name, table lookup is used instead of string
+/*	or address comparison.
+/*
+/*	match_string() matches the string against the pattern, requiring
+/*	an exact (case-insensitive) match. The flags argument is not used.
+/*
+/*	match_hostname() matches the host name when the hostname matches
+/*	the pattern exactly, or when the pattern matches a parent domain
+/*	of the named host. The flags argument specifies the bit-wise OR
+/*	of zero or more of the following:
+/* .IP MATCH_FLAG_PARENT
+/*	The hostname pattern foo.com matches itself and any name below
+/*	the domain foo.com. If this flag is cleared, foo.com matches itself
+/*	only, and .foo.com matches any name below the domain foo.com.
+/* .IP MATCH_FLAG_RETURN
+/*	Log a warning, return "not found", and set list->error to
+/*	a non-zero dictionary error code, instead of raising a fatal
+/*	run-time error.
+/* .RE
+/*	Specify MATCH_FLAG_NONE to request none of the above.
+/*
+/*	match_hostaddr() matches a host address when the pattern is
+/*	identical to the host address, or when the pattern is a net/mask
+/*	that contains the address. The mask specifies the number of
+/*	bits in the network part of the pattern. The flags argument is
+/*	not used.
+/* 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
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <split_at.h>
+#include <dict.h>
+#include <match_list.h>
+#include <stringops.h>
+#include <cidr_match.h>
+
+#define MATCH_DICTIONARY(pattern) \
+    ((pattern)[0] != '[' && strchr((pattern), ':') != 0)
+
+/* match_error - return or raise fatal error */
+
+static int match_error(MATCH_LIST *list, const char *fmt,...)
+{
+    VSTRING *buf = vstring_alloc(100);
+    va_list ap;
+
+    /*
+     * Report, and maybe return.
+     */
+    va_start(ap, fmt);
+    vstring_vsprintf(buf, fmt, ap);
+    va_end(ap);
+    if (list->flags & MATCH_FLAG_RETURN) {
+	msg_warn("%s: %s", list->pname, vstring_str(buf));
+    } else {
+	msg_fatal("%s: %s", list->pname, vstring_str(buf));
+    }
+    vstring_free(buf);
+    return (0);
+}
+
+/* match_string - match a string literal */
+
+int     match_string(MATCH_LIST *list, const char *string, const char *pattern)
+{
+    const char *myname = "match_string";
+    DICT   *dict;
+
+    if (msg_verbose)
+	msg_info("%s: %s: %s ~? %s", myname, list->pname, string, pattern);
+
+    /*
+     * Try dictionary lookup: exact match.
+     */
+    if (MATCH_DICTIONARY(pattern)) {
+	if ((dict = dict_handle(pattern)) == 0)
+	    msg_panic("%s: unknown dictionary: %s", myname, pattern);
+	if (dict_get(dict, string) != 0)
+	    return (1);
+	if ((list->error = dict->error) != 0)
+	    return (match_error(list, "%s:%s: table lookup problem",
+				dict->type, dict->name));
+	return (0);
+    }
+
+    /*
+     * Try an exact string match. Note that the string and pattern are
+     * already casefolded.
+     */
+    if (strcmp(string, pattern) == 0) {
+	return (1);
+    }
+
+    /*
+     * No match found.
+     */
+    return (0);
+}
+
+/* match_hostname - match a host by name */
+
+int     match_hostname(MATCH_LIST *list, const char *name, const char *pattern)
+{
+    const char *myname = "match_hostname";
+    const char *pd;
+    const char *entry;
+    const char *next;
+    int     match;
+    DICT   *dict;
+
+    if (msg_verbose)
+	msg_info("%s: %s: %s ~? %s", myname, list->pname, name, pattern);
+
+    /*
+     * Try dictionary lookup: exact match and parent domains.
+     * 
+     * Don't look up parent domain substrings with regexp maps etc.
+     */
+    if (MATCH_DICTIONARY(pattern)) {
+	if ((dict = dict_handle(pattern)) == 0)
+	    msg_panic("%s: unknown dictionary: %s", myname, pattern);
+	match = 0;
+	for (entry = name; *entry != 0; entry = next) {
+	    if (entry == name || (dict->flags & DICT_FLAG_FIXED)) {
+		match = (dict_get(dict, entry) != 0);
+		if (msg_verbose > 1)
+		    msg_info("%s: %s: lookup %s:%s %s: %s",
+			     myname, list->pname, dict->type, dict->name,
+			     entry, match ? "found" : "notfound");
+		if (match != 0)
+		    break;
+		if ((list->error = dict->error) != 0)
+		    return (match_error(list, "%s:%s: table lookup problem",
+					dict->type, dict->name));
+	    }
+	    if ((next = strchr(entry + 1, '.')) == 0)
+		break;
+	    if (list->flags & MATCH_FLAG_PARENT)
+		next += 1;
+	}
+	return (match);
+    }
+
+    /*
+     * Try an exact match with the host name. Note that the name and the
+     * pattern are already casefolded.
+     */
+    if (strcmp(name, pattern) == 0) {
+	return (1);
+    }
+
+    /*
+     * See if the pattern is a parent domain of the hostname. Note that the
+     * name and the pattern are already casefolded.
+     */
+    else {
+	if (list->flags & MATCH_FLAG_PARENT) {
+	    pd = name + strlen(name) - strlen(pattern);
+	    if (pd > name && pd[-1] == '.' && strcmp(pd, pattern) == 0)
+		return (1);
+	} else if (pattern[0] == '.') {
+	    pd = name + strlen(name) - strlen(pattern);
+	    if (pd > name && strcmp(pd, pattern) == 0)
+		return (1);
+	}
+    }
+    return (0);
+}
+
+/* match_hostaddr - match host by address */
+
+int     match_hostaddr(MATCH_LIST *list, const char *addr, const char *pattern)
+{
+    const char *myname = "match_hostaddr";
+    char   *saved_patt;
+    CIDR_MATCH match_info;
+    DICT   *dict;
+    VSTRING *err;
+    int     rc;
+
+    if (msg_verbose)
+	msg_info("%s: %s: %s ~? %s", myname, list->pname, addr, pattern);
+
+#define V4_ADDR_STRING_CHARS	"01234567890."
+#define V6_ADDR_STRING_CHARS	V4_ADDR_STRING_CHARS "abcdefABCDEF:"
+
+    if (addr[strspn(addr, V6_ADDR_STRING_CHARS)] != 0)
+	return (0);
+
+    /*
+     * Try dictionary lookup. This can be case insensitive.
+     */
+    if (MATCH_DICTIONARY(pattern)) {
+	if ((dict = dict_handle(pattern)) == 0)
+	    msg_panic("%s: unknown dictionary: %s", myname, pattern);
+	if (dict_get(dict, addr) != 0)
+	    return (1);
+	if ((list->error = dict->error) != 0)
+	    return (match_error(list, "%s:%s: table lookup problem",
+				dict->type, dict->name));
+	return (0);
+    }
+
+    /*
+     * Try an exact match with the host address. Note that the address and
+     * pattern are already casefolded.
+     */
+    if (pattern[0] != '[') {
+	if (strcmp(addr, pattern) == 0)
+	    return (1);
+    } else {
+	size_t  addr_len = strlen(addr);
+
+	if (strncmp(addr, pattern + 1, addr_len) == 0
+	    && strcmp(pattern + 1 + addr_len, "]") == 0)
+	    return (1);
+    }
+
+    /*
+     * Light-weight tests before we get into expensive operations.
+     * 
+     * - Don't bother matching IPv4 against IPv6. Postfix transforms
+     * IPv4-in-IPv6 to native IPv4 form when IPv4 support is enabled in
+     * Postfix; if not, then Postfix has no business dealing with IPv4
+     * addresses anyway.
+     * 
+     * - Don't bother unless the pattern is either an IPv6 address or net/mask.
+     * 
+     * We can safely skip IPv4 address patterns because their form is
+     * unambiguous and they did not match in the strcmp() calls above.
+     * 
+     * XXX We MUST skip (parent) domain names, which may appear in NAMADR_LIST
+     * input, to avoid triggering false cidr_match_parse() errors.
+     * 
+     * The last two conditions below are for backwards compatibility with
+     * earlier Postfix versions: don't abort with fatal errors on junk that
+     * was silently ignored (principle of least astonishment).
+     */
+    if (!strchr(addr, ':') != !strchr(pattern, ':')
+	|| pattern[strcspn(pattern, ":/")] == 0
+	|| pattern[strspn(pattern, V4_ADDR_STRING_CHARS)] == 0
+	|| pattern[strspn(pattern, V6_ADDR_STRING_CHARS "[]/")] != 0)
+	return (0);
+
+    /*
+     * No escape from expensive operations: either we have a net/mask
+     * pattern, or we have an address that can have multiple valid
+     * representations (e.g., 0:0:0:0:0:0:0:1 versus ::1, etc.). The only way
+     * to find out if the address matches the pattern is to transform
+     * everything into to binary form, and to do the comparison there.
+     */
+    saved_patt = mystrdup(pattern);
+    err = cidr_match_parse(&match_info, saved_patt, CIDR_MATCH_TRUE,
+			   (VSTRING *) 0);
+    myfree(saved_patt);
+    if (err != 0) {
+	list->error = DICT_ERR_RETRY;
+	rc = match_error(list, "%s", vstring_str(err));
+	vstring_free(err);
+	return (rc);
+    }
+    return (cidr_match_execute(&match_info, addr) != 0);
+}