[Bug]: Create socket failed in demo_client

[Y7n05h]

What happened?

An error occurred with demo_client.

xquic/demo/demo_client.c

Lines 1274 to 1284 in 109918f

	/* server ip */
	case 'a':
	printf("option addr :%s\n", optarg);
	snprintf(args->net_cfg.server_addr, sizeof(args->net_cfg.server_addr), optarg);
	break;
	/* server port */
	case 'p':
	printf("option port :%s\n", optarg);
	args->net_cfg.server_port = atoi(optarg);
	break;

The code save IP and port in net_cfg.server_addr. But xqc_demo_cli_create_socket use net_cfg.addr create socket.

xquic/demo/demo_client.c

Lines 1919 to 1952 in 109918f

	/* create one connection, send multi reqs in multi streams */
	int
	xqc_demo_cli_handle_task(xqc_demo_cli_ctx_t *ctx, xqc_demo_cli_task_t *task)
	{
	DEBUG;
	/* create socket and connection callback user data */
	xqc_demo_cli_user_conn_t *user_conn = calloc(1, sizeof(xqc_demo_cli_user_conn_t));
	user_conn->ctx = ctx;
	user_conn->task = task;
	// printf(".. user_conn: %p, ctx: %p\n", user_conn, ctx);
	user_conn->fd = xqc_demo_cli_create_socket(user_conn, &ctx->args->net_cfg);
	if (user_conn->fd < 0) {
	printf("xqc_create_socket error\n");
	return -1;
	}
	/* socket event */
	user_conn->ev_socket = event_new(ctx->eb, user_conn->fd, EV_READ | EV_PERSIST,
	xqc_demo_cli_socket_event_callback, user_conn);
	event_add(user_conn->ev_socket, NULL);
	/* xquic timer */
	user_conn->ev_timeout = event_new(ctx->eb, -1, 0, xqc_demo_cli_idle_callback, user_conn);
	struct timeval tv;
	tv.tv_sec = ctx->args->net_cfg.conn_timeout;
	tv.tv_usec = 0;
	event_add(user_conn->ev_timeout, &tv);
	/* start client */
	xqc_demo_cli_start(user_conn, ctx->args, task->reqs, task->req_cnt);
	task->user_conn = user_conn;
	return 0;
	}

xquic/demo/demo_client.c

Lines 1883 to 1888 in 109918f

	struct sockaddr *addr = (struct sockaddr*)&cfg->addr;
	fd = socket(addr->sa_family, SOCK_DGRAM, 0);
	if (fd < 0) {
	printf("create socket failed, errno: %d\n", get_last_sys_errno());
	return -1;
	}

Steps To Reproduce

Compile with boringSSL on Linux platforms.

1. Run ./demo_server -p 9998
2. Run ./demo_client -p 9998 -a 127.0.0.1

Relevant log output

demo_client Output：

option port :9998
option addr :127.0.0.1
create socket failed, errno: 97
xqc_create_socket error
all tasks are finished, will break loop and exit

perror 97
OS error code  97:  Address family not supported by protocol

[ruiqizhou]

Duplicate with #128

The demo_client and demo_server is used for Interoperability Test. You can use . /test_client and . /test_server.
For testing the library, see the Testing docs.