The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * WPA Supplicant / Windows Named Pipe -based control interface |
| 3 | * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 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. |
| 8 | * |
| 9 | * Alternatively, this software may be distributed under the terms of BSD |
| 10 | * license. |
| 11 | * |
| 12 | * See README and COPYING for more details. |
| 13 | */ |
| 14 | |
| 15 | #include "includes.h" |
| 16 | |
| 17 | #include "common.h" |
| 18 | #include "eloop.h" |
| 19 | #include "config.h" |
| 20 | #include "eapol_sm.h" |
| 21 | #include "wpa_supplicant_i.h" |
| 22 | #include "ctrl_iface.h" |
| 23 | #include "wpa_ctrl.h" |
| 24 | |
| 25 | #ifdef __MINGW32_VERSION |
| 26 | /* mingw-w32api v3.1 does not yet include sddl.h, so define needed parts here |
| 27 | */ |
| 28 | #define SDDL_REVISION_1 1 |
| 29 | BOOL WINAPI ConvertStringSecurityDescriptorToSecurityDescriptorA( |
| 30 | LPCSTR, DWORD, PSECURITY_DESCRIPTOR *, PULONG); |
| 31 | BOOL WINAPI ConvertStringSecurityDescriptorToSecurityDescriptorW( |
| 32 | LPCWSTR, DWORD, PSECURITY_DESCRIPTOR *, PULONG); |
| 33 | #ifdef UNICODE |
| 34 | #define ConvertStringSecurityDescriptorToSecurityDescriptor \ |
| 35 | ConvertStringSecurityDescriptorToSecurityDescriptorW |
| 36 | #else |
| 37 | #define ConvertStringSecurityDescriptorToSecurityDescriptor \ |
| 38 | ConvertStringSecurityDescriptorToSecurityDescriptorA |
| 39 | #endif |
| 40 | #else /* __MINGW32_VERSION */ |
| 41 | #ifndef _WIN32_WINNT |
| 42 | #define _WIN32_WINNT 0x0500 |
| 43 | #endif |
| 44 | #include <sddl.h> |
| 45 | #endif /* __MINGW32_VERSION */ |
| 46 | |
| 47 | #ifndef WPA_SUPPLICANT_NAMED_PIPE |
| 48 | #define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant" |
| 49 | #endif |
| 50 | #define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE) |
| 51 | |
| 52 | /* Per-interface ctrl_iface */ |
| 53 | |
| 54 | #define REQUEST_BUFSIZE 256 |
| 55 | #define REPLY_BUFSIZE 4096 |
| 56 | |
| 57 | struct ctrl_iface_priv; |
| 58 | |
| 59 | /** |
| 60 | * struct wpa_ctrl_dst - Internal data structure of control interface clients |
| 61 | * |
| 62 | * This structure is used to store information about registered control |
| 63 | * interface monitors into struct wpa_supplicant. This data is private to |
| 64 | * ctrl_iface_named_pipe.c and should not be touched directly from other files. |
| 65 | */ |
| 66 | struct wpa_ctrl_dst { |
| 67 | /* Note: OVERLAPPED must be the first member of struct wpa_ctrl_dst */ |
| 68 | OVERLAPPED overlap; |
| 69 | struct wpa_ctrl_dst *next, *prev; |
| 70 | struct ctrl_iface_priv *priv; |
| 71 | HANDLE pipe; |
| 72 | int attached; |
| 73 | int debug_level; |
| 74 | int errors; |
| 75 | char req_buf[REQUEST_BUFSIZE]; |
| 76 | char *rsp_buf; |
| 77 | int used; |
| 78 | }; |
| 79 | |
| 80 | |
| 81 | struct ctrl_iface_priv { |
| 82 | struct wpa_supplicant *wpa_s; |
| 83 | struct wpa_ctrl_dst *ctrl_dst; |
| 84 | SECURITY_ATTRIBUTES attr; |
| 85 | int sec_attr_set; |
| 86 | }; |
| 87 | |
| 88 | |
| 89 | static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv, |
| 90 | int level, const char *buf, |
| 91 | size_t len); |
| 92 | |
| 93 | static void ctrl_close_pipe(struct wpa_ctrl_dst *dst); |
| 94 | static void wpa_supplicant_ctrl_iface_receive(void *, void *); |
| 95 | static VOID WINAPI ctrl_iface_read_completed(DWORD err, DWORD bytes, |
| 96 | LPOVERLAPPED overlap); |
| 97 | |
| 98 | struct wpa_global_dst; |
| 99 | static void global_close_pipe(struct wpa_global_dst *dst); |
| 100 | static void wpa_supplicant_global_iface_receive(void *eloop_data, |
| 101 | void *user_ctx); |
| 102 | static VOID WINAPI global_iface_read_completed(DWORD err, DWORD bytes, |
| 103 | LPOVERLAPPED overlap); |
| 104 | |
| 105 | |
| 106 | static int ctrl_broken_pipe(HANDLE pipe, int used) |
| 107 | { |
| 108 | DWORD err; |
| 109 | |
| 110 | if (PeekNamedPipe(pipe, NULL, 0, NULL, NULL, NULL)) |
| 111 | return 0; |
| 112 | |
| 113 | err = GetLastError(); |
| 114 | if (err == ERROR_BROKEN_PIPE || (err == ERROR_BAD_PIPE && used)) |
| 115 | return 1; |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | |
| 120 | static void ctrl_flush_broken_pipes(struct ctrl_iface_priv *priv) |
| 121 | { |
| 122 | struct wpa_ctrl_dst *dst, *next; |
| 123 | |
| 124 | dst = priv->ctrl_dst; |
| 125 | |
| 126 | while (dst) { |
| 127 | next = dst->next; |
| 128 | if (ctrl_broken_pipe(dst->pipe, dst->used)) { |
| 129 | wpa_printf(MSG_DEBUG, "CTRL: closing broken pipe %p", |
| 130 | dst); |
| 131 | ctrl_close_pipe(dst); |
| 132 | } |
| 133 | dst = next; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | |
| 138 | static int ctrl_open_pipe(struct ctrl_iface_priv *priv) |
| 139 | { |
| 140 | struct wpa_ctrl_dst *dst; |
| 141 | DWORD err; |
| 142 | TCHAR name[256]; |
| 143 | |
| 144 | dst = os_zalloc(sizeof(*dst)); |
| 145 | if (dst == NULL) |
| 146 | return -1; |
| 147 | wpa_printf(MSG_DEBUG, "CTRL: Open pipe %p", dst); |
| 148 | |
| 149 | dst->priv = priv; |
| 150 | dst->debug_level = MSG_INFO; |
| 151 | dst->pipe = INVALID_HANDLE_VALUE; |
| 152 | |
| 153 | dst->overlap.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); |
| 154 | if (dst->overlap.hEvent == NULL) { |
| 155 | wpa_printf(MSG_ERROR, "CTRL: CreateEvent failed: %d", |
| 156 | (int) GetLastError()); |
| 157 | goto fail; |
| 158 | } |
| 159 | |
| 160 | eloop_register_event(dst->overlap.hEvent, |
| 161 | sizeof(dst->overlap.hEvent), |
| 162 | wpa_supplicant_ctrl_iface_receive, dst, NULL); |
| 163 | |
| 164 | #ifdef UNICODE |
| 165 | _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"), |
| 166 | priv->wpa_s->ifname); |
| 167 | #else /* UNICODE */ |
| 168 | os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s", |
| 169 | priv->wpa_s->ifname); |
| 170 | #endif /* UNICODE */ |
| 171 | |
| 172 | /* TODO: add support for configuring access list for the pipe */ |
| 173 | dst->pipe = CreateNamedPipe(name, |
| 174 | PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, |
| 175 | PIPE_TYPE_MESSAGE | |
| 176 | PIPE_READMODE_MESSAGE | |
| 177 | PIPE_WAIT, |
| 178 | 15, REPLY_BUFSIZE, REQUEST_BUFSIZE, |
| 179 | 1000, |
| 180 | priv->sec_attr_set ? &priv->attr : NULL); |
| 181 | if (dst->pipe == INVALID_HANDLE_VALUE) { |
| 182 | wpa_printf(MSG_ERROR, "CTRL: CreateNamedPipe failed: %d", |
| 183 | (int) GetLastError()); |
| 184 | goto fail; |
| 185 | } |
| 186 | |
| 187 | if (ConnectNamedPipe(dst->pipe, &dst->overlap)) { |
| 188 | wpa_printf(MSG_ERROR, "CTRL: ConnectNamedPipe failed: %d", |
| 189 | (int) GetLastError()); |
| 190 | CloseHandle(dst->pipe); |
| 191 | os_free(dst); |
| 192 | return -1; |
| 193 | } |
| 194 | |
| 195 | err = GetLastError(); |
| 196 | switch (err) { |
| 197 | case ERROR_IO_PENDING: |
| 198 | wpa_printf(MSG_DEBUG, "CTRL: ConnectNamedPipe: connection in " |
| 199 | "progress"); |
| 200 | break; |
| 201 | case ERROR_PIPE_CONNECTED: |
| 202 | wpa_printf(MSG_DEBUG, "CTRL: ConnectNamedPipe: already " |
| 203 | "connected"); |
| 204 | if (SetEvent(dst->overlap.hEvent)) |
| 205 | break; |
| 206 | /* fall through */ |
| 207 | default: |
| 208 | wpa_printf(MSG_DEBUG, "CTRL: ConnectNamedPipe error: %d", |
| 209 | (int) err); |
| 210 | CloseHandle(dst->pipe); |
| 211 | os_free(dst); |
| 212 | return -1; |
| 213 | } |
| 214 | |
| 215 | dst->next = priv->ctrl_dst; |
| 216 | if (dst->next) |
| 217 | dst->next->prev = dst; |
| 218 | priv->ctrl_dst = dst; |
| 219 | |
| 220 | return 0; |
| 221 | |
| 222 | fail: |
| 223 | ctrl_close_pipe(dst); |
| 224 | return -1; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | static void ctrl_close_pipe(struct wpa_ctrl_dst *dst) |
| 229 | { |
| 230 | wpa_printf(MSG_DEBUG, "CTRL: close pipe %p", dst); |
| 231 | |
| 232 | if (dst->overlap.hEvent) { |
| 233 | eloop_unregister_event(dst->overlap.hEvent, |
| 234 | sizeof(dst->overlap.hEvent)); |
| 235 | CloseHandle(dst->overlap.hEvent); |
| 236 | } |
| 237 | |
| 238 | if (dst->pipe != INVALID_HANDLE_VALUE) { |
| 239 | /* |
| 240 | * Could use FlushFileBuffers() here to guarantee that all data |
| 241 | * gets delivered to the client, but that can block, so let's |
| 242 | * not do this for now. |
| 243 | * FlushFileBuffers(dst->pipe); |
| 244 | */ |
| 245 | CloseHandle(dst->pipe); |
| 246 | } |
| 247 | |
| 248 | if (dst->prev) |
| 249 | dst->prev->next = dst->next; |
| 250 | else |
| 251 | dst->priv->ctrl_dst = dst->next; |
| 252 | if (dst->next) |
| 253 | dst->next->prev = dst->prev; |
| 254 | |
| 255 | os_free(dst->rsp_buf); |
| 256 | os_free(dst); |
| 257 | } |
| 258 | |
| 259 | |
| 260 | static VOID WINAPI ctrl_iface_write_completed(DWORD err, DWORD bytes, |
| 261 | LPOVERLAPPED overlap) |
| 262 | { |
| 263 | struct wpa_ctrl_dst *dst = (struct wpa_ctrl_dst *) overlap; |
| 264 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped write completed: dst=%p " |
| 265 | "err=%d bytes=%d", dst, (int) err, (int) bytes); |
| 266 | if (err) { |
| 267 | ctrl_close_pipe(dst); |
| 268 | return; |
| 269 | } |
| 270 | |
| 271 | os_free(dst->rsp_buf); |
| 272 | dst->rsp_buf = NULL; |
| 273 | |
| 274 | if (!ReadFileEx(dst->pipe, dst->req_buf, sizeof(dst->req_buf), |
| 275 | &dst->overlap, ctrl_iface_read_completed)) { |
| 276 | wpa_printf(MSG_DEBUG, "CTRL: ReadFileEx failed: %d", |
| 277 | (int) GetLastError()); |
| 278 | ctrl_close_pipe(dst); |
| 279 | return; |
| 280 | } |
| 281 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped read started for %p", dst); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | static void wpa_supplicant_ctrl_iface_rx(struct wpa_ctrl_dst *dst, size_t len) |
| 286 | { |
| 287 | struct wpa_supplicant *wpa_s = dst->priv->wpa_s; |
| 288 | char *reply = NULL, *send_buf; |
| 289 | size_t reply_len = 0, send_len; |
| 290 | int new_attached = 0; |
| 291 | char *buf = dst->req_buf; |
| 292 | |
| 293 | dst->used = 1; |
| 294 | if (len >= REQUEST_BUFSIZE) |
| 295 | len = REQUEST_BUFSIZE - 1; |
| 296 | buf[len] = '\0'; |
| 297 | |
| 298 | if (os_strcmp(buf, "ATTACH") == 0) { |
| 299 | dst->attached = 1; |
| 300 | wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached"); |
| 301 | new_attached = 1; |
| 302 | reply_len = 2; |
| 303 | } else if (os_strcmp(buf, "DETACH") == 0) { |
| 304 | dst->attached = 0; |
| 305 | wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached"); |
| 306 | reply_len = 2; |
| 307 | } else if (os_strncmp(buf, "LEVEL ", 6) == 0) { |
| 308 | wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", buf + 6); |
| 309 | dst->debug_level = atoi(buf + 6); |
| 310 | reply_len = 2; |
| 311 | } else { |
| 312 | reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf, |
| 313 | &reply_len); |
| 314 | } |
| 315 | |
| 316 | if (reply) { |
| 317 | send_buf = reply; |
| 318 | send_len = reply_len; |
| 319 | } else if (reply_len == 2) { |
| 320 | send_buf = "OK\n"; |
| 321 | send_len = 3; |
| 322 | } else { |
| 323 | send_buf = "FAIL\n"; |
| 324 | send_len = 5; |
| 325 | } |
| 326 | |
| 327 | os_free(dst->rsp_buf); |
| 328 | dst->rsp_buf = os_malloc(send_len); |
| 329 | if (dst->rsp_buf == NULL) { |
| 330 | ctrl_close_pipe(dst); |
| 331 | os_free(reply); |
| 332 | return; |
| 333 | } |
| 334 | os_memcpy(dst->rsp_buf, send_buf, send_len); |
| 335 | os_free(reply); |
| 336 | |
| 337 | if (!WriteFileEx(dst->pipe, dst->rsp_buf, send_len, &dst->overlap, |
| 338 | ctrl_iface_write_completed)) { |
| 339 | wpa_printf(MSG_DEBUG, "CTRL: WriteFileEx failed: %d", |
| 340 | (int) GetLastError()); |
| 341 | ctrl_close_pipe(dst); |
| 342 | } else { |
| 343 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped write started for %p", |
| 344 | dst); |
| 345 | } |
| 346 | |
| 347 | if (new_attached) |
| 348 | eapol_sm_notify_ctrl_attached(wpa_s->eapol); |
| 349 | } |
| 350 | |
| 351 | |
| 352 | static VOID WINAPI ctrl_iface_read_completed(DWORD err, DWORD bytes, |
| 353 | LPOVERLAPPED overlap) |
| 354 | { |
| 355 | struct wpa_ctrl_dst *dst = (struct wpa_ctrl_dst *) overlap; |
| 356 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped read completed: dst=%p err=%d " |
| 357 | "bytes=%d", dst, (int) err, (int) bytes); |
| 358 | if (err == 0 && bytes > 0) |
| 359 | wpa_supplicant_ctrl_iface_rx(dst, bytes); |
| 360 | } |
| 361 | |
| 362 | |
| 363 | static void wpa_supplicant_ctrl_iface_receive(void *eloop_data, void *user_ctx) |
| 364 | { |
| 365 | struct wpa_ctrl_dst *dst = eloop_data; |
| 366 | struct ctrl_iface_priv *priv = dst->priv; |
| 367 | DWORD bytes; |
| 368 | |
| 369 | wpa_printf(MSG_DEBUG, "CTRL: wpa_supplicant_ctrl_iface_receive"); |
| 370 | ResetEvent(dst->overlap.hEvent); |
| 371 | |
| 372 | if (!GetOverlappedResult(dst->pipe, &dst->overlap, &bytes, FALSE)) { |
| 373 | wpa_printf(MSG_DEBUG, "CTRL: GetOverlappedResult failed: %d", |
| 374 | (int) GetLastError()); |
| 375 | return; |
| 376 | } |
| 377 | wpa_printf(MSG_DEBUG, "CTRL: GetOverlappedResult: New client " |
| 378 | "connected"); |
| 379 | |
| 380 | /* Open a new named pipe for the next client. */ |
| 381 | ctrl_open_pipe(priv); |
| 382 | |
| 383 | /* Use write completion function to start reading a command */ |
| 384 | ctrl_iface_write_completed(0, 0, &dst->overlap); |
| 385 | |
| 386 | ctrl_flush_broken_pipes(priv); |
| 387 | } |
| 388 | |
| 389 | |
| 390 | static int ctrl_iface_parse(struct ctrl_iface_priv *priv, const char *params) |
| 391 | { |
| 392 | const char *sddl = NULL; |
| 393 | TCHAR *t_sddl; |
| 394 | |
| 395 | if (os_strncmp(params, "SDDL=", 5) == 0) |
| 396 | sddl = params + 5; |
| 397 | if (!sddl) { |
| 398 | sddl = os_strstr(params, " SDDL="); |
| 399 | if (sddl) |
| 400 | sddl += 6; |
| 401 | } |
| 402 | |
| 403 | if (!sddl) |
| 404 | return 0; |
| 405 | |
| 406 | wpa_printf(MSG_DEBUG, "CTRL: SDDL='%s'", sddl); |
| 407 | os_memset(&priv->attr, 0, sizeof(priv->attr)); |
| 408 | priv->attr.nLength = sizeof(priv->attr); |
| 409 | priv->attr.bInheritHandle = FALSE; |
| 410 | t_sddl = wpa_strdup_tchar(sddl); |
| 411 | if (t_sddl == NULL) |
| 412 | return -1; |
| 413 | if (!ConvertStringSecurityDescriptorToSecurityDescriptor( |
| 414 | t_sddl, SDDL_REVISION_1, |
| 415 | (PSECURITY_DESCRIPTOR *) &priv->attr.lpSecurityDescriptor, |
| 416 | NULL)) { |
| 417 | os_free(t_sddl); |
| 418 | wpa_printf(MSG_ERROR, "CTRL: SDDL='%s' - could not convert to " |
| 419 | "security descriptor: %d", |
| 420 | sddl, (int) GetLastError()); |
| 421 | return -1; |
| 422 | } |
| 423 | os_free(t_sddl); |
| 424 | |
| 425 | priv->sec_attr_set = 1; |
| 426 | |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | |
| 431 | static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level, |
| 432 | const char *txt, size_t len) |
| 433 | { |
| 434 | struct wpa_supplicant *wpa_s = ctx; |
| 435 | if (wpa_s == NULL || wpa_s->ctrl_iface == NULL) |
| 436 | return; |
| 437 | wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len); |
| 438 | } |
| 439 | |
| 440 | |
| 441 | struct ctrl_iface_priv * |
| 442 | wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s) |
| 443 | { |
| 444 | struct ctrl_iface_priv *priv; |
| 445 | |
| 446 | priv = os_zalloc(sizeof(*priv)); |
| 447 | if (priv == NULL) |
| 448 | return NULL; |
| 449 | priv->wpa_s = wpa_s; |
| 450 | |
| 451 | if (wpa_s->conf->ctrl_interface == NULL) |
| 452 | return priv; |
| 453 | |
| 454 | if (ctrl_iface_parse(priv, wpa_s->conf->ctrl_interface) < 0) { |
| 455 | os_free(priv); |
| 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | if (ctrl_open_pipe(priv) < 0) { |
| 460 | os_free(priv); |
| 461 | return NULL; |
| 462 | } |
| 463 | |
| 464 | wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb); |
| 465 | |
| 466 | return priv; |
| 467 | } |
| 468 | |
| 469 | |
| 470 | void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv) |
| 471 | { |
| 472 | while (priv->ctrl_dst) |
| 473 | ctrl_close_pipe(priv->ctrl_dst); |
| 474 | if (priv->sec_attr_set) |
| 475 | LocalFree(priv->attr.lpSecurityDescriptor); |
| 476 | os_free(priv); |
| 477 | } |
| 478 | |
| 479 | |
| 480 | static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv, |
| 481 | int level, const char *buf, |
| 482 | size_t len) |
| 483 | { |
| 484 | struct wpa_ctrl_dst *dst, *next; |
| 485 | char levelstr[10]; |
| 486 | int idx; |
| 487 | char *sbuf; |
| 488 | int llen; |
| 489 | DWORD written; |
| 490 | |
| 491 | dst = priv->ctrl_dst; |
| 492 | if (dst == NULL) |
| 493 | return; |
| 494 | |
| 495 | os_snprintf(levelstr, sizeof(levelstr), "<%d>", level); |
| 496 | |
| 497 | llen = os_strlen(levelstr); |
| 498 | sbuf = os_malloc(llen + len); |
| 499 | if (sbuf == NULL) |
| 500 | return; |
| 501 | |
| 502 | os_memcpy(sbuf, levelstr, llen); |
| 503 | os_memcpy(sbuf + llen, buf, len); |
| 504 | |
| 505 | idx = 0; |
| 506 | while (dst) { |
| 507 | next = dst->next; |
| 508 | if (dst->attached && level >= dst->debug_level) { |
| 509 | wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %p", |
| 510 | dst); |
| 511 | if (!WriteFile(dst->pipe, sbuf, llen + len, &written, |
| 512 | NULL)) { |
| 513 | wpa_printf(MSG_DEBUG, "CTRL: WriteFile to dst " |
| 514 | "%p failed: %d", |
| 515 | dst, (int) GetLastError()); |
| 516 | dst->errors++; |
| 517 | if (dst->errors > 10) |
| 518 | ctrl_close_pipe(dst); |
| 519 | } else |
| 520 | dst->errors = 0; |
| 521 | } |
| 522 | idx++; |
| 523 | dst = next; |
| 524 | } |
| 525 | os_free(sbuf); |
| 526 | } |
| 527 | |
| 528 | |
| 529 | void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv) |
| 530 | { |
| 531 | wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor", |
| 532 | priv->wpa_s->ifname); |
| 533 | if (priv->ctrl_dst == NULL) |
| 534 | return; |
| 535 | WaitForSingleObject(priv->ctrl_dst->pipe, INFINITE); |
| 536 | } |
| 537 | |
| 538 | |
| 539 | /* Global ctrl_iface */ |
| 540 | |
| 541 | struct ctrl_iface_global_priv; |
| 542 | |
| 543 | struct wpa_global_dst { |
| 544 | /* Note: OVERLAPPED must be the first member of struct wpa_global_dst |
| 545 | */ |
| 546 | OVERLAPPED overlap; |
| 547 | struct wpa_global_dst *next, *prev; |
| 548 | struct ctrl_iface_global_priv *priv; |
| 549 | HANDLE pipe; |
| 550 | char req_buf[REQUEST_BUFSIZE]; |
| 551 | char *rsp_buf; |
| 552 | int used; |
| 553 | }; |
| 554 | |
| 555 | struct ctrl_iface_global_priv { |
| 556 | struct wpa_global *global; |
| 557 | struct wpa_global_dst *ctrl_dst; |
| 558 | }; |
| 559 | |
| 560 | |
| 561 | static void global_flush_broken_pipes(struct ctrl_iface_global_priv *priv) |
| 562 | { |
| 563 | struct wpa_global_dst *dst, *next; |
| 564 | |
| 565 | dst = priv->ctrl_dst; |
| 566 | |
| 567 | while (dst) { |
| 568 | next = dst->next; |
| 569 | if (ctrl_broken_pipe(dst->pipe, dst->used)) { |
| 570 | wpa_printf(MSG_DEBUG, "CTRL: closing broken pipe %p", |
| 571 | dst); |
| 572 | global_close_pipe(dst); |
| 573 | } |
| 574 | dst = next; |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | |
| 579 | static int global_open_pipe(struct ctrl_iface_global_priv *priv) |
| 580 | { |
| 581 | struct wpa_global_dst *dst; |
| 582 | DWORD err; |
| 583 | |
| 584 | dst = os_zalloc(sizeof(*dst)); |
| 585 | if (dst == NULL) |
| 586 | return -1; |
| 587 | wpa_printf(MSG_DEBUG, "CTRL: Open pipe %p", dst); |
| 588 | |
| 589 | dst->priv = priv; |
| 590 | dst->pipe = INVALID_HANDLE_VALUE; |
| 591 | |
| 592 | dst->overlap.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL); |
| 593 | if (dst->overlap.hEvent == NULL) { |
| 594 | wpa_printf(MSG_ERROR, "CTRL: CreateEvent failed: %d", |
| 595 | (int) GetLastError()); |
| 596 | goto fail; |
| 597 | } |
| 598 | |
| 599 | eloop_register_event(dst->overlap.hEvent, |
| 600 | sizeof(dst->overlap.hEvent), |
| 601 | wpa_supplicant_global_iface_receive, dst, NULL); |
| 602 | |
| 603 | /* TODO: add support for configuring access list for the pipe */ |
| 604 | dst->pipe = CreateNamedPipe(NAMED_PIPE_PREFIX, |
| 605 | PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, |
| 606 | PIPE_TYPE_MESSAGE | |
| 607 | PIPE_READMODE_MESSAGE | |
| 608 | PIPE_WAIT, |
| 609 | 10, REPLY_BUFSIZE, REQUEST_BUFSIZE, |
| 610 | 1000, NULL); |
| 611 | if (dst->pipe == INVALID_HANDLE_VALUE) { |
| 612 | wpa_printf(MSG_ERROR, "CTRL: CreateNamedPipe failed: %d", |
| 613 | (int) GetLastError()); |
| 614 | goto fail; |
| 615 | } |
| 616 | |
| 617 | if (ConnectNamedPipe(dst->pipe, &dst->overlap)) { |
| 618 | wpa_printf(MSG_ERROR, "CTRL: ConnectNamedPipe failed: %d", |
| 619 | (int) GetLastError()); |
| 620 | CloseHandle(dst->pipe); |
| 621 | os_free(dst); |
| 622 | return -1; |
| 623 | } |
| 624 | |
| 625 | err = GetLastError(); |
| 626 | switch (err) { |
| 627 | case ERROR_IO_PENDING: |
| 628 | wpa_printf(MSG_DEBUG, "CTRL: ConnectNamedPipe: connection in " |
| 629 | "progress"); |
| 630 | break; |
| 631 | case ERROR_PIPE_CONNECTED: |
| 632 | wpa_printf(MSG_DEBUG, "CTRL: ConnectNamedPipe: already " |
| 633 | "connected"); |
| 634 | if (SetEvent(dst->overlap.hEvent)) |
| 635 | break; |
| 636 | /* fall through */ |
| 637 | default: |
| 638 | wpa_printf(MSG_DEBUG, "CTRL: ConnectNamedPipe error: %d", |
| 639 | (int) err); |
| 640 | CloseHandle(dst->pipe); |
| 641 | os_free(dst); |
| 642 | return -1; |
| 643 | } |
| 644 | |
| 645 | dst->next = priv->ctrl_dst; |
| 646 | if (dst->next) |
| 647 | dst->next->prev = dst; |
| 648 | priv->ctrl_dst = dst; |
| 649 | |
| 650 | return 0; |
| 651 | |
| 652 | fail: |
| 653 | global_close_pipe(dst); |
| 654 | return -1; |
| 655 | } |
| 656 | |
| 657 | |
| 658 | static void global_close_pipe(struct wpa_global_dst *dst) |
| 659 | { |
| 660 | wpa_printf(MSG_DEBUG, "CTRL: close pipe %p", dst); |
| 661 | |
| 662 | if (dst->overlap.hEvent) { |
| 663 | eloop_unregister_event(dst->overlap.hEvent, |
| 664 | sizeof(dst->overlap.hEvent)); |
| 665 | CloseHandle(dst->overlap.hEvent); |
| 666 | } |
| 667 | |
| 668 | if (dst->pipe != INVALID_HANDLE_VALUE) { |
| 669 | /* |
| 670 | * Could use FlushFileBuffers() here to guarantee that all data |
| 671 | * gets delivered to the client, but that can block, so let's |
| 672 | * not do this for now. |
| 673 | * FlushFileBuffers(dst->pipe); |
| 674 | */ |
| 675 | CloseHandle(dst->pipe); |
| 676 | } |
| 677 | |
| 678 | if (dst->prev) |
| 679 | dst->prev->next = dst->next; |
| 680 | else |
| 681 | dst->priv->ctrl_dst = dst->next; |
| 682 | if (dst->next) |
| 683 | dst->next->prev = dst->prev; |
| 684 | |
| 685 | os_free(dst->rsp_buf); |
| 686 | os_free(dst); |
| 687 | } |
| 688 | |
| 689 | |
| 690 | static VOID WINAPI global_iface_write_completed(DWORD err, DWORD bytes, |
| 691 | LPOVERLAPPED overlap) |
| 692 | { |
| 693 | struct wpa_global_dst *dst = (struct wpa_global_dst *) overlap; |
| 694 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped write completed: dst=%p " |
| 695 | "err=%d bytes=%d", dst, (int) err, (int) bytes); |
| 696 | if (err) { |
| 697 | global_close_pipe(dst); |
| 698 | return; |
| 699 | } |
| 700 | |
| 701 | os_free(dst->rsp_buf); |
| 702 | dst->rsp_buf = NULL; |
| 703 | |
| 704 | if (!ReadFileEx(dst->pipe, dst->req_buf, sizeof(dst->req_buf), |
| 705 | &dst->overlap, global_iface_read_completed)) { |
| 706 | wpa_printf(MSG_DEBUG, "CTRL: ReadFileEx failed: %d", |
| 707 | (int) GetLastError()); |
| 708 | global_close_pipe(dst); |
| 709 | /* FIX: if this was the pipe waiting for new global |
| 710 | * connections, at this point there are no open global pipes.. |
| 711 | * Should try to open a new pipe.. */ |
| 712 | return; |
| 713 | } |
| 714 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped read started for %p", dst); |
| 715 | } |
| 716 | |
| 717 | |
| 718 | static void wpa_supplicant_global_iface_rx(struct wpa_global_dst *dst, |
| 719 | size_t len) |
| 720 | { |
| 721 | struct wpa_global *global = dst->priv->global; |
| 722 | char *reply = NULL, *send_buf; |
| 723 | size_t reply_len = 0, send_len; |
| 724 | char *buf = dst->req_buf; |
| 725 | |
| 726 | dst->used = 1; |
| 727 | if (len >= REQUEST_BUFSIZE) |
| 728 | len = REQUEST_BUFSIZE - 1; |
| 729 | buf[len] = '\0'; |
| 730 | |
| 731 | reply = wpa_supplicant_global_ctrl_iface_process(global, buf, |
| 732 | &reply_len); |
| 733 | if (reply) { |
| 734 | send_buf = reply; |
| 735 | send_len = reply_len; |
| 736 | } else if (reply_len) { |
| 737 | send_buf = "FAIL\n"; |
| 738 | send_len = 5; |
| 739 | } else { |
| 740 | os_free(dst->rsp_buf); |
| 741 | dst->rsp_buf = NULL; |
| 742 | return; |
| 743 | } |
| 744 | |
| 745 | os_free(dst->rsp_buf); |
| 746 | dst->rsp_buf = os_malloc(send_len); |
| 747 | if (dst->rsp_buf == NULL) { |
| 748 | global_close_pipe(dst); |
| 749 | os_free(reply); |
| 750 | return; |
| 751 | } |
| 752 | os_memcpy(dst->rsp_buf, send_buf, send_len); |
| 753 | os_free(reply); |
| 754 | |
| 755 | if (!WriteFileEx(dst->pipe, dst->rsp_buf, send_len, &dst->overlap, |
| 756 | global_iface_write_completed)) { |
| 757 | wpa_printf(MSG_DEBUG, "CTRL: WriteFileEx failed: %d", |
| 758 | (int) GetLastError()); |
| 759 | global_close_pipe(dst); |
| 760 | } else { |
| 761 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped write started for %p", |
| 762 | dst); |
| 763 | } |
| 764 | } |
| 765 | |
| 766 | |
| 767 | static VOID WINAPI global_iface_read_completed(DWORD err, DWORD bytes, |
| 768 | LPOVERLAPPED overlap) |
| 769 | { |
| 770 | struct wpa_global_dst *dst = (struct wpa_global_dst *) overlap; |
| 771 | wpa_printf(MSG_DEBUG, "CTRL: Overlapped read completed: dst=%p err=%d " |
| 772 | "bytes=%d", dst, (int) err, (int) bytes); |
| 773 | if (err == 0 && bytes > 0) |
| 774 | wpa_supplicant_global_iface_rx(dst, bytes); |
| 775 | } |
| 776 | |
| 777 | |
| 778 | static void wpa_supplicant_global_iface_receive(void *eloop_data, |
| 779 | void *user_ctx) |
| 780 | { |
| 781 | struct wpa_global_dst *dst = eloop_data; |
| 782 | struct ctrl_iface_global_priv *priv = dst->priv; |
| 783 | DWORD bytes; |
| 784 | |
| 785 | wpa_printf(MSG_DEBUG, "CTRL: wpa_supplicant_global_iface_receive"); |
| 786 | ResetEvent(dst->overlap.hEvent); |
| 787 | |
| 788 | if (!GetOverlappedResult(dst->pipe, &dst->overlap, &bytes, FALSE)) { |
| 789 | wpa_printf(MSG_DEBUG, "CTRL: GetOverlappedResult failed: %d", |
| 790 | (int) GetLastError()); |
| 791 | return; |
| 792 | } |
| 793 | wpa_printf(MSG_DEBUG, "CTRL: GetOverlappedResult: New client " |
| 794 | "connected"); |
| 795 | |
| 796 | /* Open a new named pipe for the next client. */ |
| 797 | if (global_open_pipe(priv) < 0) { |
| 798 | wpa_printf(MSG_DEBUG, "CTRL: global_open_pipe failed"); |
| 799 | return; |
| 800 | } |
| 801 | |
| 802 | /* Use write completion function to start reading a command */ |
| 803 | global_iface_write_completed(0, 0, &dst->overlap); |
| 804 | |
| 805 | global_flush_broken_pipes(priv); |
| 806 | } |
| 807 | |
| 808 | |
| 809 | struct ctrl_iface_global_priv * |
| 810 | wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global) |
| 811 | { |
| 812 | struct ctrl_iface_global_priv *priv; |
| 813 | |
| 814 | priv = os_zalloc(sizeof(*priv)); |
| 815 | if (priv == NULL) |
| 816 | return NULL; |
| 817 | priv->global = global; |
| 818 | |
| 819 | if (global_open_pipe(priv) < 0) { |
| 820 | os_free(priv); |
| 821 | return NULL; |
| 822 | } |
| 823 | |
| 824 | return priv; |
| 825 | } |
| 826 | |
| 827 | |
| 828 | void |
| 829 | wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv) |
| 830 | { |
| 831 | while (priv->ctrl_dst) |
| 832 | global_close_pipe(priv->ctrl_dst); |
| 833 | os_free(priv); |
| 834 | } |