1 files changed, 60 insertions, 1 deletions

diff --git a/match.c b/match.c
index 5386df6c4..b72efca7e 100644
--- a/match.c
+++ b/match.c
@@ -14,7 +14,7 @@
  */
 
 #include "includes.h"
-RCSID("$Id: match.c,v 1.3 1999/11/25 00:54:59 damien Exp $");
+RCSID("$Id: match.c,v 1.4 2000/03/26 03:04:53 damien Exp $");
 
 #include "ssh.h"
 
@@ -80,3 +80,62 @@ match_pattern(const char *s, const char *pattern)
         }
         /* NOTREACHED */
 }
+
+/*
+ * Tries to match the host name (which must be in all lowercase) against the
+ * comma-separated sequence of subpatterns (each possibly preceded by ! to
+ * indicate negation).  Returns true if there is a positive match; zero
+ * otherwise.
+ */
+
+int
+match_hostname(const char *host, const char *pattern, unsigned int len)
+{
+        char sub[1024];
+        int negated;
+        int got_positive;
+        unsigned int i, subi;
+
+        got_positive = 0;
+        for (i = 0; i < len;) {
+                /* Check if the subpattern is negated. */
+                if (pattern[i] == '!') {
+                        negated = 1;
+                        i++;
+                } else
+                        negated = 0;
+
+                /*
+                 * Extract the subpattern up to a comma or end.  Convert the
+                 * subpattern to lowercase.
+                 */
+                for (subi = 0;
+                     i < len && subi < sizeof(sub) - 1 && pattern[i] != ',';
+                     subi++, i++)
+                        sub[subi] = isupper(pattern[i]) ? tolower(pattern[i]) : pattern[i];
+                /* If subpattern too long, return failure (no match). */
+                if (subi >= sizeof(sub) - 1)
+                        return 0;
+
+                /* If the subpattern was terminated by a comma, skip the comma. */
+                if (i < len && pattern[i] == ',')
+                        i++;
+
+                /* Null-terminate the subpattern. */
+                sub[subi] = '\0';
+
+                /* Try to match the subpattern against the host name. */
+                if (match_pattern(host, sub)) {
+                        if (negated)
+                                return 0;       /* Fail */
+                        else
+                                got_positive = 1;
+                }
+        }
+
+        /*
+         * Return success if got a positive match.  If there was a negative
+         * match, we have already returned zero and never get here.
+         */
+        return got_positive;
+}