From 61f2d0e71b7df4ee6fdd1747c6149541d0411044 Mon Sep 17 00:00:00 2001
From: Paweł Redman <pawel.redman@gmail.com>
Date: Thu, 6 Apr 2017 22:34:52 +0200
Subject: Add command-line arguments.

---
 src/main.c   | 54 ++++++++++++++++++++++++++++++++++++++++++++++++------
 src/shared.h |  5 ++++-
 2 files changed, 52 insertions(+), 7 deletions(-)

diff --git a/src/main.c b/src/main.c
index b58f143..44d831d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -63,7 +63,7 @@ static int parse_req_addr(char *begin, char *end, uint32_t *out)
 	return 0;
 }
 
-void handle_request(struct sockaddr_in *ret_addr, uint32_t query)
+static void handle_request(struct sockaddr_in *ret_addr, uint32_t query)
 {
 	db_entry *entry;
 	job_t *reply_job;
@@ -130,7 +130,7 @@ static volatile sig_atomic_t signals_reload = false;
 
 // NOTE: The code assumes that signal_handler will only be called in the main
 //       thread, which (as far as I know) is always the case on Linux.
-void signal_handler(int signum)
+static void signal_handler(int signum)
 {
 	if (signum == SIGINT || signum == SIGTERM)
 		signals_terminate = true;
@@ -139,7 +139,7 @@ void signal_handler(int signum)
 		signals_reload = true;
 }
 
-int handle_signals(void)
+static int handle_signals(void)
 {
 	if (signals_terminate) {
 		DEBUG("received a terminating signal\n");
@@ -160,9 +160,47 @@ int handle_signals(void)
 	return 0;
 }
 
+static struct {
+	int port;
+	char *lists_file;
+} config = {
+	.port = 1337,
+	.lists_file = "schachts.list"
+};
+
+static int parse_argv(int argc, char **argv)
+{
+	int opt;
+
+	while ((opt = getopt(argc, argv, "vhp:l:")) != -1) {
+		switch (opt) {
+		case 'v':
+			puts(PROGRAM_NAME " " PROGRAM_VERSION);
+			exit(0);
+
+		case 'h':
+			puts("usage: " PROGRAM_NAME " [-h] [-v] [-p PORT] [-l LISTS-FILE]");
+			exit();
+
+		case 'p':
+			config.port = atoi(optarg);
+			break;
+
+		case 'l':
+			config.lists_file = optarg;
+			break;
+
+		case '?':
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
 #define NUM_WORKERS 8 // FIXME: shouldn't be hardcoded
 
-int main(void)
+int main(int argc, char **argv)
 {
 	int error = 0 /* the exit code */, flags;
 	struct sigaction sigact = {.sa_handler = signal_handler};
@@ -172,11 +210,14 @@ int main(void)
 
 	clock_gettime(CLOCK_MONOTONIC_RAW, &time_ref);
 
+	if (parse_argv(argc, argv))
+		return 1;
+
 	sigaction(SIGINT, &sigact, NULL);
 	sigaction(SIGTERM, &sigact, NULL);
 	sigaction(SIGUSR1, &sigact, NULL);
 
-	if (lists_load("schachts.list", 0)) {
+	if (lists_load(config.lists_file, 0)) {
 		eprintf("fatal error: couldn't load the lists\n");
 		goto error_lists;
 	}
@@ -194,10 +235,11 @@ int main(void)
 
 	sockaddr.sin_family = AF_INET;
 	sockaddr.sin_addr.s_addr = INADDR_ANY;
-	sockaddr.sin_port = htons(1337);
+	sockaddr.sin_port = htons(config.port);
 
 	if (bind(server_sockfd, (void*)&sockaddr, sizeof(sockaddr)) == -1) {
 		perror("bind");
+		eprintf("couldn't bind to UDP port %hi\n", ntohs(sockaddr.sin_port));
 		error = 1;
 		goto error_bind;
 	}
diff --git a/src/shared.h b/src/shared.h
index 187edcc..46c900e 100644
--- a/src/shared.h
+++ b/src/shared.h
@@ -33,8 +33,11 @@ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 
 #include "eli.h"
 
+#define PROGRAM_NAME "schachtmeister2"
+#define PROGRAM_VERSION "v0.1.0"
+
 #define eprintf(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)
-#define DEBUG(fmt, ...) fprintf(stderr, "%s: " fmt, __func__, ##__VA_ARGS__)
+#define DEBUG(fmt, ...) fprintf(stderr, "[DEBUG] %s: " fmt, __func__, ##__VA_ARGS__)
 
 #define LOCALHOST_NETWORK 0x7F000000
 #define LOCALHOST_MASK    0xFF000000
-- 
cgit