options: Allow interface block to be pattern matching

Fixes #473

Author: rsmarples

src/dhcpcd.conf.5.in

@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd February 23, 2025
+.Dd February 24, 2025
 .Dt DHCPCD.CONF 5
 .Os
 .Sh NAME
@@ -446,6 +446,8 @@ encodes the FQDN hostname as specified in
 .It Ic interface Ar interface
 Subsequent options are only parsed for this
 .Ar interface .
+Pattern matching is allowed by
+.Xr fnmatch 3 .
 .It Ic ipv4ll_time Ar seconds
 Wait for
 .Ar seconds

src/if-options.c

@@ -33,6 +33,7 @@
 
 #include <ctype.h>
 #include <errno.h>
+#include <fnmatch.h>
 #include <getopt.h>
 #include <grp.h>
 #include <inttypes.h>
@@ -2875,7 +2876,7 @@ read_config(struct dhcpcd_ctx *ctx,
 				skip = 1;
 				continue;
 			}
-			if (ifname && strcmp(line, ifname) == 0)
+			if (ifname && fnmatch(line, ifname, 0) == 0)
 				skip = 0;
 			else
 				skip = 1;

src/if.c

@@ -250,7 +250,7 @@ if_hasconf(struct dhcpcd_ctx *ctx, const char *ifname)
 	int i;
 
 	for (i = 0; i < ctx->ifcc; i++) {
-		if (strcmp(ctx->ifcv[i], ifname) == 0)
+		if (fnmatch(ctx->ifcv[i], ifname, 0) == 0)
 			return 1;
 	}
 	return 0;