test: Test init with options

test/ares-test-init.cc

@@ -53,6 +53,74 @@ TEST_F(LibraryTest, BasicChannelInit) {
   ares_library_cleanup();
 }
 
+TEST_F(LibraryTest, OptionsChannelInit) {
+  struct ares_options opts = {0};
+  int optmask = 0;
+  opts.flags = ARES_FLAG_USEVC;
+  optmask |= ARES_OPT_FLAGS;
+  opts.timeout = 2000;
+  optmask |= ARES_OPT_TIMEOUTMS;
+  opts.tries = 2;
+  optmask |= ARES_OPT_TRIES;
+  opts.ndots = 4;
+  optmask |= ARES_OPT_NDOTS;
+  opts.udp_port = 54;
+  optmask |= ARES_OPT_UDP_PORT;
+  opts.tcp_port = 54;
+  optmask |= ARES_OPT_TCP_PORT;
+  opts.socket_send_buffer_size = 514;
+  optmask |= ARES_OPT_SOCK_SNDBUF;
+  opts.socket_receive_buffer_size = 514;
+  optmask |= ARES_OPT_SOCK_RCVBUF;
+  opts.ednspsz = 1280;
+  optmask |= ARES_OPT_EDNSPSZ;
+  opts.nservers = 2;
+  opts.servers = (struct in_addr *)malloc(opts.nservers * sizeof(struct in_addr));
+  opts.servers[0].s_addr = htonl(0x01020304);
+  opts.servers[1].s_addr = htonl(0x02030405);
+  optmask |= ARES_OPT_SERVERS;
+  opts.ndomains = 2;
+  opts.domains = (char **)malloc(opts.ndomains * sizeof(char *));
+  opts.domains[0] = strdup("example.com");
+  opts.domains[1] = strdup("example2.com");
+  optmask |= ARES_OPT_DOMAINS;
+  opts.lookups = strdup("b");
+  optmask |= ARES_OPT_LOOKUPS;
+  optmask |= ARES_OPT_ROTATE;
+
+  ares_channel channel = nullptr;
+  EXPECT_EQ(ARES_SUCCESS, ares_init_options(&channel, &opts, optmask));
+  EXPECT_NE(nullptr, channel);
+
+  ares_channel channel2 = nullptr;
+  EXPECT_EQ(ARES_SUCCESS, ares_dup(&channel2, channel));
+
+  struct ares_options opts2 = {0};
+  int optmask2 = 0;
+  ares_save_options(channel2, &opts2, &optmask2);
+
+  // Note that not all opts-settable fields are saved (e.g.
+  // ednspsz, socket_{send,receive}_buffer_size).
+  EXPECT_EQ(opts.flags, opts2.flags);
+  EXPECT_EQ(opts.timeout, opts2.timeout);
+  EXPECT_EQ(opts.tries, opts2.tries);
+  EXPECT_EQ(opts.ndots, opts2.ndots);
+  EXPECT_EQ(opts.udp_port, opts2.udp_port);
+  EXPECT_EQ(opts.tcp_port, opts2.tcp_port);
+  EXPECT_EQ(opts.nservers, opts2.nservers);
+  EXPECT_EQ(opts.servers[0].s_addr, opts2.servers[0].s_addr);
+  EXPECT_EQ(opts.servers[1].s_addr, opts2.servers[1].s_addr);
+  EXPECT_EQ(opts.ndomains, opts2.ndomains);
+  EXPECT_EQ(std::string(opts.domains[0]), std::string(opts2.domains[0]));
+  EXPECT_EQ(std::string(opts.domains[1]), std::string(opts2.domains[1]));
+  EXPECT_EQ(std::string(opts.lookups), std::string(opts2.lookups));
+
+  ares_destroy_options(&opts);
+  ares_destroy_options(&opts2);
+  ares_destroy(channel);
+  ares_destroy(channel2);
+}
+
 TEST_F(LibraryTest, FailChannelInit) {
   EXPECT_EQ(ARES_SUCCESS,
             ares_library_init_mem(ARES_LIB_INIT_ALL,