cooker: add flags with getopts

2 files changed, 88 insertions, 6 deletions

diff --git a/cooker/gluten.h b/cooker/gluten.h
index e0ea54d..4659583 100644
--- a/cooker/gluten.h
+++ b/cooker/gluten.h
@@ -9,6 +9,11 @@
 #define COOKER
 #include <gluten.h>
 
+enum scmp_mode {
+	SCMP_FILTER,
+	SCMP_PROFILE,
+};
+
 struct gluten_arg_data {
 	struct gluten_offset offset;
 	size_t len;
@@ -37,6 +42,8 @@ struct gluten_ctx {
 	struct attr attrs[ATTRS_MAX];
 
 	struct arg *selected_arg[6];
+
+	enum scmp_mode mode;
 };
 
 /**
diff --git a/cooker/main.c b/cooker/main.c
index a1e5f7f..85c4746 100644
--- a/cooker/main.c
+++ b/cooker/main.c
@@ -6,14 +6,90 @@
  *
  * Copyright 2023 Red Hat GmbH
  * Author: Stefano Brivio <sbrivio@redhat.com>
+ * 	   Alice Frosi <afrosi@redhat.com>
  */
 
+#define _GNU_SOURCE
+#include <getopt.h>
+
 #include "parson.h"
 #include "cooker.h"
 #include "gluten.h"
 #include "parse.h"
 #include "filter.h"
 
+/* Cooker options */
+static struct option options[] = {
+	{ "input", required_argument, NULL, 'i' },
+	{ "gluten", required_argument, NULL, 'g' },
+	{ "filter", required_argument, NULL, 'f' },
+	{ "scmp-profile", required_argument, NULL, 'p' },
+};
+
+struct arguments {
+	char *input_file;
+	char *gluten_file;
+	char *filter_file;
+	char *scmp_profile_file;
+};
+
+static void usage()
+{
+	printf("seitan-cooker: generate the BPF filters or seccomp profile and the action byte code for seitan\n"
+               "Example:  setain-cooker -i <input file> -g <gluten_file> -f <filter_file>\n"
+               "Usage:\n"
+               "\t-i, --input:\tJSON input file\n"
+               "\t-g, --gluten:\tBytecode file for seitan action\n"
+               "\t-f, --filter:\tBPF filter file (cannot be used together with scmp-profile)\n"
+               "\t-p, --scmp-profile:\tSeccomp profile file (cannot be used together with filter)\n");
+        exit(EXIT_FAILURE);
+}
+
+static void parse(int argc, char **argv, struct arguments *arguments)
+{
+	int option_index = 0;
+	int oc;
+	if (arguments == NULL)
+		usage();
+	while ((oc = getopt_long(argc, argv, ":i:g:f:p:", options,
+				 &option_index)) != -1) {
+		switch (oc) {
+		case 'i':
+			arguments->input_file = optarg;
+			break;
+		case 'g':
+			arguments->gluten_file = optarg;
+			break;
+		case 'f':
+			arguments->filter_file = optarg;
+			break;
+		case 'p':
+			arguments->scmp_profile_file = optarg;
+			break;
+		default:
+			usage();
+		}
+	}
+	if (arguments->input_file == NULL) {
+		err("missing input file");
+		usage();
+	}
+	if (arguments->filter_file != NULL &&
+	    arguments->scmp_profile_file != NULL) {
+		err("the filter and scmp-profile options cannot be used together");
+		usage();
+	}
+	if (arguments->filter_file == NULL &&
+	    arguments->scmp_profile_file == NULL) {
+		err("select one of the options between filter and scmp-profile");
+		usage();
+	}
+	if (arguments->gluten_file == NULL) {
+		err("missing gluten file");
+		usage();
+	}
+}
+
 /**
  * main() - Entry point for cooker
  * @argc:	Argument count
@@ -23,18 +99,17 @@
  */
 int main(int argc, char **argv)
 {
+	struct arguments arguments = { 0 };
 	struct gluten_ctx g = { 0 };
 
-	/* TODO: Options and usage */
-	if (argc != 4)
-		die("%s INPUT GLUTEN BPF", argv[0]);
+	parse(argc, argv, &arguments);
 
 	gluten_init(&g);
 
-	parse_file(&g, argv[1]);
+	parse_file(&g, arguments.input_file);
 
-	gluten_write(&g, argv[2]);
-	filter_write(argv[3]);
+	gluten_write(&g, arguments.gluten_file);
+	filter_write(arguments.filter_file);
 
 	return 0;
 }