initial commit

third_party/libhv/examples/udp_proxy_server.c

@@ -0,0 +1,53 @@
+/*
+ * udp proxy server
+ *
+ * @build:        make examples
+ * @udp_server:   bin/udp_echo_server 1234
+ * @proxy_server: bin/udp_proxy_server 2222 127.0.0.1:1234
+ * @client:       bin/nc -u 127.0.0.1 2222
+ *                > hello
+ *                < hello
+ */
+
+#include "hloop.h"
+
+static char proxy_host[64] = "0.0.0.0";
+static int  proxy_port = 1080;
+
+static char backend_host[64] = "127.0.0.1";
+static int  backend_port = 80;
+
+// hloop_create_udp_server -> hio_setup_udp_upstream
+
+int main(int argc, char** argv) {
+    if (argc < 3) {
+        printf("Usage: %s proxy_port backend_host:backend_port\n", argv[0]);
+        return -10;
+    }
+    proxy_port = atoi(argv[1]);
+    char* pos = strchr(argv[2], ':');
+    if (pos) {
+        int len = pos - argv[2];
+        if (len > 0) {
+            memcpy(backend_host, argv[2], len);
+            backend_host[len] = '\0';
+        }
+        backend_port = atoi(pos + 1);
+    } else {
+        strncpy(backend_host, argv[2], sizeof(backend_host));
+    }
+    printf("%s:%d proxy %s:%d\n", proxy_host, proxy_port, backend_host, backend_port);
+
+    hloop_t* loop = hloop_new(0);
+    hio_t* io = hloop_create_udp_server(loop, proxy_host, proxy_port);
+    if (io == NULL) {
+        return -20;
+    }
+    hio_t* upstream_io = hio_setup_udp_upstream(io, backend_host, backend_port);
+    if (upstream_io == NULL) {
+        return -30;
+    }
+    hloop_run(loop);
+    hloop_free(&loop);
+    return 0;
+}