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;
68 ctrl = os_malloc(sizeof(*ctrl));
71 os_memset(ctrl, 0, sizeof(*ctrl));
73 ctrl->s = socket(PF_UNIX, SOCK_DGRAM, 0);
79 ctrl->local.sun_family = AF_UNIX;
80 ret = os_snprintf(ctrl->local.sun_path, sizeof(ctrl->local.sun_path),
81 "/tmp/wpa_ctrl_%d-%d", getpid(), counter++);
82 if (ret < 0 || (size_t) ret >= sizeof(ctrl->local.sun_path)) {
87 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
88 sizeof(ctrl->local)) < 0) {
94 ctrl->dest.sun_family = AF_UNIX;
95 res = os_strlcpy(ctrl->dest.sun_path, ctrl_path,
96 sizeof(ctrl->dest.sun_path));
97 if (res >= sizeof(ctrl->dest.sun_path)) {
102 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
103 sizeof(ctrl->dest)) < 0) {
105 unlink(ctrl->local.sun_path);
114 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
116 unlink(ctrl->local.sun_path);
121 #endif /* CONFIG_CTRL_IFACE_UNIX */
124 #ifdef CONFIG_CTRL_IFACE_UDP
126 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
128 struct wpa_ctrl *ctrl;
132 ctrl = os_malloc(sizeof(*ctrl));
135 os_memset(ctrl, 0, sizeof(*ctrl));
137 ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
144 ctrl->local.sin_family = AF_INET;
145 ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
146 if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
147 sizeof(ctrl->local)) < 0) {
153 ctrl->dest.sin_family = AF_INET;
154 ctrl->dest.sin_addr.s_addr = htonl((127 << 24) | 1);
155 ctrl->dest.sin_port = htons(WPA_CTRL_IFACE_PORT);
156 if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
157 sizeof(ctrl->dest)) < 0) {
164 len = sizeof(buf) - 1;
165 if (wpa_ctrl_request(ctrl, "GET_COOKIE", 10, buf, &len, NULL) == 0) {
167 ctrl->cookie = os_strdup(buf);
174 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
177 os_free(ctrl->cookie);
181 #endif /* CONFIG_CTRL_IFACE_UDP */
184 #ifdef CTRL_IFACE_SOCKET
185 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
186 char *reply, size_t *reply_len,
187 void (*msg_cb)(char *msg, size_t len))
193 char *cmd_buf = NULL;
196 #ifdef CONFIG_CTRL_IFACE_UDP
199 _cmd_len = os_strlen(ctrl->cookie) + 1 + cmd_len;
200 cmd_buf = os_malloc(_cmd_len);
205 os_strlcpy(pos, ctrl->cookie, _cmd_len);
206 pos += os_strlen(ctrl->cookie);
208 os_memcpy(pos, cmd, cmd_len);
210 #endif /* CONFIG_CTRL_IFACE_UDP */
216 if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
226 FD_SET(ctrl->s, &rfds);
227 res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
228 if (FD_ISSET(ctrl->s, &rfds)) {
229 res = recv(ctrl->s, reply, *reply_len, 0);
232 if (res > 0 && reply[0] == '<') {
233 /* This is an unsolicited message from
234 * wpa_supplicant, not the reply to the
235 * request. Use msg_cb to report this to the
238 /* Make sure the message is nul
240 if ((size_t) res == *reply_len)
241 res = (*reply_len) - 1;
255 #endif /* CTRL_IFACE_SOCKET */
258 static int wpa_ctrl_attach_helper(struct wpa_ctrl *ctrl, int attach)
264 ret = wpa_ctrl_request(ctrl, attach ? "ATTACH" : "DETACH", 6,
268 if (len == 3 && os_memcmp(buf, "OK\n", 3) == 0)
274 int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
276 return wpa_ctrl_attach_helper(ctrl, 1);
280 int wpa_ctrl_detach(struct wpa_ctrl *ctrl)
282 return wpa_ctrl_attach_helper(ctrl, 0);
286 #ifdef CTRL_IFACE_SOCKET
288 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
292 res = recv(ctrl->s, reply, *reply_len, 0);
300 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
307 FD_SET(ctrl->s, &rfds);
308 select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
309 return FD_ISSET(ctrl->s, &rfds);
313 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
318 #endif /* CTRL_IFACE_SOCKET */
321 #ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
323 #ifndef WPA_SUPPLICANT_NAMED_PIPE
324 #define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant"
326 #define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE)
328 struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
330 struct wpa_ctrl *ctrl;
335 ctrl = os_malloc(sizeof(*ctrl));
338 os_memset(ctrl, 0, sizeof(*ctrl));
341 if (ctrl_path == NULL)
342 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX);
344 ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
347 if (ctrl_path == NULL)
348 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX);
350 ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
353 if (ret < 0 || ret >= 256) {
358 for (i = 0; i < 10; i++) {
359 ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
360 NULL, OPEN_EXISTING, 0, NULL);
362 * Current named pipe server side in wpa_supplicant is
363 * re-opening the pipe for new clients only after the previous
364 * one is taken into use. This leaves a small window for race
365 * conditions when two connections are being opened at almost
366 * the same time. Retry if that was the case.
368 if (ctrl->pipe != INVALID_HANDLE_VALUE ||
369 GetLastError() != ERROR_PIPE_BUSY)
371 WaitNamedPipe(name, 1000);
373 if (ctrl->pipe == INVALID_HANDLE_VALUE) {
378 mode = PIPE_READMODE_MESSAGE;
379 if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
380 CloseHandle(ctrl->pipe);
389 void wpa_ctrl_close(struct wpa_ctrl *ctrl)
391 CloseHandle(ctrl->pipe);
396 int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
397 char *reply, size_t *reply_len,
398 void (*msg_cb)(char *msg, size_t len))
401 DWORD readlen = *reply_len;
403 if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))
406 if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))
408 *reply_len = readlen;
414 int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
416 DWORD len = *reply_len;
417 if (!ReadFile(ctrl->pipe, reply, *reply_len, &len, NULL))
424 int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
428 if (!PeekNamedPipe(ctrl->pipe, NULL, 0, NULL, &left, NULL))
434 int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
439 #endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
441 #endif /* CONFIG_CTRL_IFACE */