2 * wpa_supplicant/hostapd control interface library
3 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
17 #ifdef CONFIG_CTRL_IFACE
19 #ifdef CONFIG_CTRL_IFACE_UNIX
21 #endif /* CONFIG_CTRL_IFACE_UNIX */
27 #if defined(CONFIG_CTRL_IFACE_UNIX) || defined(CONFIG_CTRL_IFACE_UDP)
28 #define CTRL_IFACE_SOCKET
29 #endif /* CONFIG_CTRL_IFACE_UNIX || CONFIG_CTRL_IFACE_UDP */
33 * struct wpa_ctrl - Internal structure for control interface library
35 * This structure is used by the wpa_supplicant/hostapd control interface
36 * library to store internal data. Programs using the library should not touch
37 * this data directly. They can only use the pointer to the data structure as
38 * an identifier for the control interface connection and use this as one of
39 * the arguments for most of the control interface library functions.
42 #ifdef CONFIG_CTRL_IFACE_UDP
44 struct sockaddr_in local;
45 struct sockaddr_in dest;
47 #endif /* CONFIG_CTRL_IFACE_UDP */
48 #ifdef CONFIG_CTRL_IFACE_UNIX
50 struct sockaddr_un local;
51 struct sockaddr_un dest;
52 #endif /* CONFIG_CTRL_IFACE_UNIX */
53 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
55 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
59 #ifdef CONFIG_CTRL_IFACE_UNIX
61 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
63 struct wpa_ctrl *ctrl;
64 static int counter = 0;
69 ctrl = os_malloc(sizeof(*ctrl));
72 os_memset(ctrl, 0, sizeof(*ctrl));
74 ctrl->s = socket(PF_UNIX, SOCK_DGRAM, 0);
80 ctrl->local.sun_family = AF_UNIX;
83 ret = os_snprintf(ctrl->local.sun_path, sizeof(ctrl->local.sun_path),
84 "/tmp/wpa_ctrl_%d-%d", getpid(), counter);
85 if (ret < 0 || (size_t) ret >= sizeof(ctrl->local.sun_path)) {
91 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
92 sizeof(ctrl->local)) < 0) {
93 if (errno == EADDRINUSE && tries < 2) {
95 * getpid() returns unique identifier for this instance
96 * of wpa_ctrl, so the existing socket file must have
97 * been left by unclean termination of an earlier run.
98 * Remove the file and try again.
100 unlink(ctrl->local.sun_path);
108 ctrl->dest.sun_family = AF_UNIX;
109 res = os_strlcpy(ctrl->dest.sun_path, ctrl_path,
110 sizeof(ctrl->dest.sun_path));
111 if (res >= sizeof(ctrl->dest.sun_path)) {
116 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
117 sizeof(ctrl->dest)) < 0) {
119 unlink(ctrl->local.sun_path);
128 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
130 unlink(ctrl->local.sun_path);
135 #endif /* CONFIG_CTRL_IFACE_UNIX */
138 #ifdef CONFIG_CTRL_IFACE_UDP
140 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
142 struct wpa_ctrl *ctrl;
146 ctrl = os_malloc(sizeof(*ctrl));
149 os_memset(ctrl, 0, sizeof(*ctrl));
151 ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
158 ctrl->local.sin_family = AF_INET;
159 ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
160 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
161 sizeof(ctrl->local)) < 0) {
167 ctrl->dest.sin_family = AF_INET;
168 ctrl->dest.sin_addr.s_addr = htonl((127 << 24) | 1);
169 ctrl->dest.sin_port = htons(WPA_CTRL_IFACE_PORT);
170 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
171 sizeof(ctrl->dest)) < 0) {
178 len = sizeof(buf) - 1;
179 if (wpa_ctrl_request(ctrl, "GET_COOKIE", 10, buf, &len, NULL) == 0) {
181 ctrl->cookie = os_strdup(buf);
188 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
191 os_free(ctrl->cookie);
195 #endif /* CONFIG_CTRL_IFACE_UDP */
198 #ifdef CTRL_IFACE_SOCKET
199 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
200 char *reply, size_t *reply_len,
201 void (*msg_cb)(char *msg, size_t len))
207 char *cmd_buf = NULL;
210 #ifdef CONFIG_CTRL_IFACE_UDP
213 _cmd_len = os_strlen(ctrl->cookie) + 1 + cmd_len;
214 cmd_buf = os_malloc(_cmd_len);
219 os_strlcpy(pos, ctrl->cookie, _cmd_len);
220 pos += os_strlen(ctrl->cookie);
222 os_memcpy(pos, cmd, cmd_len);
224 #endif /* CONFIG_CTRL_IFACE_UDP */
230 if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
240 FD_SET(ctrl->s, &rfds);
241 res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
242 if (FD_ISSET(ctrl->s, &rfds)) {
243 res = recv(ctrl->s, reply, *reply_len, 0);
246 if (res > 0 && reply[0] == '<') {
247 /* This is an unsolicited message from
248 * wpa_supplicant, not the reply to the
249 * request. Use msg_cb to report this to the
252 /* Make sure the message is nul
254 if ((size_t) res == *reply_len)
255 res = (*reply_len) - 1;
269 #endif /* CTRL_IFACE_SOCKET */
272 static int wpa_ctrl_attach_helper(struct wpa_ctrl *ctrl, int attach)
278 ret = wpa_ctrl_request(ctrl, attach ? "ATTACH" : "DETACH", 6,
282 if (len == 3 && os_memcmp(buf, "OK\n", 3) == 0)
288 int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
290 return wpa_ctrl_attach_helper(ctrl, 1);
294 int wpa_ctrl_detach(struct wpa_ctrl *ctrl)
296 return wpa_ctrl_attach_helper(ctrl, 0);
300 #ifdef CTRL_IFACE_SOCKET
302 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
306 res = recv(ctrl->s, reply, *reply_len, 0);
314 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
321 FD_SET(ctrl->s, &rfds);
322 select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
323 return FD_ISSET(ctrl->s, &rfds);
327 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
332 #endif /* CTRL_IFACE_SOCKET */
335 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
337 #ifndef WPA_SUPPLICANT_NAMED_PIPE
338 #define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant"
340 #define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE)
342 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
344 struct wpa_ctrl *ctrl;
349 ctrl = os_malloc(sizeof(*ctrl));
352 os_memset(ctrl, 0, sizeof(*ctrl));
355 if (ctrl_path == NULL)
356 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX);
358 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
361 if (ctrl_path == NULL)
362 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX);
364 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
367 if (ret < 0 || ret >= 256) {
372 for (i = 0; i < 10; i++) {
373 ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
374 NULL, OPEN_EXISTING, 0, NULL);
376 * Current named pipe server side in wpa_supplicant is
377 * re-opening the pipe for new clients only after the previous
378 * one is taken into use. This leaves a small window for race
379 * conditions when two connections are being opened at almost
380 * the same time. Retry if that was the case.
382 if (ctrl->pipe != INVALID_HANDLE_VALUE ||
383 GetLastError() != ERROR_PIPE_BUSY)
385 WaitNamedPipe(name, 1000);
387 if (ctrl->pipe == INVALID_HANDLE_VALUE) {
392 mode = PIPE_READMODE_MESSAGE;
393 if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
394 CloseHandle(ctrl->pipe);
403 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
405 CloseHandle(ctrl->pipe);
410 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
411 char *reply, size_t *reply_len,
412 void (*msg_cb)(char *msg, size_t len))
415 DWORD readlen = *reply_len;
417 if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))
420 if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))
422 *reply_len = readlen;
428 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
430 DWORD len = *reply_len;
431 if (!ReadFile(ctrl->pipe, reply, *reply_len, &len, NULL))
438 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
442 if (!PeekNamedPipe(ctrl->pipe, NULL, 0, NULL, &left, NULL))
448 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
453 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
455 #endif /* CONFIG_CTRL_IFACE */