feat: Go转C

c/cmd/udprelay.c

@@ -0,0 +1,59 @@
+#include "cli_parse.h"
+#include "server_udp_relay.h"
+
+static void udprelay_usage(FILE *out) {
+    fprintf(out, "usage: udprelay [-listen addr] [-upstream addr]\n");
+}
+
+int main(int argc, char **argv) {
+    const char *listen_addr = ":9003";
+    const char *upstream_addr = "127.0.0.1:9002";
+    udp_relay_t *relay = NULL;
+    int i;
+    int rc = 1;
+
+    for (i = 1; i < argc; ++i) {
+        const char *value = NULL;
+        int handled;
+
+        if ((handled = cli_parse_value_flag(argc, argv, &i, argv[i], "-listen", &value)) < 0) {
+            fprintf(stderr, "udprelay: flag -listen requires a value\n");
+            return 1;
+        } else if (handled) {
+            listen_addr = value;
+            continue;
+        }
+        if ((handled = cli_parse_value_flag(argc, argv, &i, argv[i], "-upstream", &value)) < 0) {
+            fprintf(stderr, "udprelay: flag -upstream requires a value\n");
+            return 1;
+        } else if (handled) {
+            upstream_addr = value;
+            continue;
+        }
+        if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
+            udprelay_usage(stdout);
+            return 0;
+        }
+        fprintf(stderr, "udprelay: unknown argument %s\n", argv[i]);
+        udprelay_usage(stderr);
+        return 1;
+    }
+
+    relay = udp_relay_open(listen_addr, upstream_addr);
+    if (relay == NULL) {
+        fprintf(stderr, "udprelay: open relay %s -> %s failed\n", listen_addr, upstream_addr);
+        goto cleanup;
+    }
+
+    fprintf(stderr, "udp relay listening on %s, upstream %s\n", listen_addr, upstream_addr);
+    if (udp_relay_serve(relay) != 0) {
+        fprintf(stderr, "udprelay: relay serve failed\n");
+        goto cleanup;
+    }
+
+    rc = 0;
+
+cleanup:
+    udp_relay_free(relay);
+    return rc;
+}