PCSC那事儿(三十五--PCSCD)

回到RFAddReader

237  238         /* asynchronous card movement?  */  239         {  240                 RESPONSECODE (*fct)(DWORD) = NULL;  241  242                 dwGetSize = sizeof(fct);  243  244                 rv = IFDGetCapabilities((sReadersContexts[dwContext]),  245                         TAG_IFD_POLLING_THREAD, &dwGetSize, (PUCHAR)&fct);  246                 if ((rv != SCARD_S_SUCCESS) || (dwGetSize != sizeof(fct)))  247                 {  248                         fct = NULL;  249                         Log1(PCSC_LOG_INFO, "Using the pcscd polling thread");  250                 }  251                 else  252                         Log1(PCSC_LOG_INFO, "Using the reader polling thread");  253

244行，查询驱动是否提供fct回调函数地址。接下去启动线程，如果存在，线程运行的上下文中会包含这个fct.

254                 rv = EHSpawnEventHandler(sReadersContexts[dwContext], fct);  255                 if (rv != SCARD_S_SUCCESS)  256                 {  257                         Log2(PCSC_LOG_ERROR, "%s init failed.", lpcReader);  258                         (void)RFRemoveReader(lpcReader, dwPort);  259                         return rv;  260                 }  261         }

254行， EHSpawnEventHandler开始启动线程，不断查询读卡器状态了。

EHSpawnEventHandler在eventhandler.c中定义

实现如下：

168 LONG EHSpawnEventHandler(PREADER_CONTEXT rContext, 169         RESPONSECODE (*card_event)(DWORD)) 170 { 171         LONG rv; 172         DWORD dwStatus = 0; 173         int i; 174         UCHAR ucAtr[MAX_ATR_SIZE]; 175         DWORD dwAtrLen = 0; 176 177         rv = IFDStatusICC(rContext, &dwStatus, ucAtr, &dwAtrLen); 178         if (rv != SCARD_S_SUCCESS) 179         { 180                 Log2(PCSC_LOG_ERROR, "Initial Check Failed on %s", rContext->lpcReader); 181                 return SCARD_F_UNKNOWN_ERROR; 182         } 183

 

177行， IFDStatusICC在ifdwrapper.c实现，

定义如下：

412 LONG IFDStatusICC(PREADER_CONTEXT rContext, PDWORD pdwStatus, 413         PUCHAR pucAtr, PDWORD pdwAtrLen) 414 { 415         RESPONSECODE rv = IFD_SUCCESS; 416         DWORD dwTag = 0, dwCardStatus = 0; 417         SMARTCARD_EXTENSION sSmartCard; 418         UCHAR ucValue[1] = "/x00"; 419 420 #ifndef PCSCLITE_STATIC_DRIVER 421         RESPONSECODE(*IFD_is_icc_present) (void) = NULL; 422         RESPONSECODE(*IFDH_icc_presence) (DWORD) = NULL; 423         RESPONSECODE(*IFD_get_capabilities) (DWORD, /*@out@*/ PUCHAR) = NULL; 424 425         if (rContext->dwVersion == IFD_HVERSION_1_0) 426         { 427                 IFD_is_icc_present = 428                         rContext->psFunctions.psFunctions_v1.pvfICCPresence; 429                 IFD_get_capabilities = 430                         rContext->psFunctions.psFunctions_v1.pvfGetCapabilities; 431         } 432         else 433                 IFDH_icc_presence = rContext->psFunctions.psFunctions_v2.pvfICCPresence; 434 #endif

首先，从前面RFBindFunctions初始化好的函数指针变量中获取对应的函数地址。

接着进行调用

435 436         /* LOCK THIS CODE REGION */ 437         (void)SYS_MutexLock(rContext->mMutex); 438 439 #ifndef PCSCLITE_STATIC_DRIVER 440         if (rContext->dwVersion == IFD_HVERSION_1_0) 441         { 442                 ucValue[0] = rContext->dwSlot; 443                 (void)IFDSetCapabilities(rContext, TAG_IFD_SLOTNUM, 1, ucValue); 444                 rv = (*IFD_is_icc_present) (); 445         } 446         else 447                 rv = (*IFDH_icc_presence) (rContext->dwSlot); 448 #else 449         if (rContext->dwVersion == IFD_HVERSION_1_0) 450         { 451                 ucValue[0] = rContext->dwSlot; 452                 (void)IFDSetCapabilities(rContext, TAG_IFD_SLOTNUM, 1, ucValue); 453                 rv = IFD_Is_ICC_Present(); 454         } 455         else 456                 rv = IFDHICCPresence(rContext->dwSlot); 457 #endif 458 459         /* END OF LOCKED REGION */ 460         (void)SYS_MutexUnLock(rContext->mMutex);

440~447行，根据版本，调用相应的函数。查询对应读卡器中的卡是否存在。

448~457行，不会被编译。

461 462         if (rv == IFD_SUCCESS || rv == IFD_ICC_PRESENT) 463                 dwCardStatus |= SCARD_PRESENT; 464         else 465                 if (rv == IFD_ICC_NOT_PRESENT) 466                         dwCardStatus |= SCARD_ABSENT; 467                 else 468                 { 469                         Log2(PCSC_LOG_ERROR, "Card not transacted: %ld", rv); 470                         *pdwStatus = SCARD_UNKNOWN; 471 472                         if (rv == IFD_NO_SUCH_DEVICE) 473                         { 474                                 (void)SendHotplugSignal(); 475                                 return SCARD_E_READER_UNAVAILABLE; 476                         } 477 478                         return SCARD_E_NOT_TRANSACTED; 479                 }

463行，466行，如果查询结果表示卡存在则标志是 SCARD_PRESENT,

否则是 SCARD_ABSENT

474行， 再查询失败，而且返回 IFD_NO_SUCH_DEVICE的时候，有 SendHotplugSignal

上面分析过了，最主要还是关照了serial版本的读卡器。SendHotplugSignal，里有 HPReCheckSerialReaders(重新检测系统里的serial版本的读卡器，对于这个函数，后面会具体再说)。某个serial读卡器，可能被拔走了。

480 481         /* 482          * Now lets get the ATR and process it if IFD Handler version 1.0. 483          * IFD Handler version 2.0 does this immediately after reset/power up 484          * to conserve resources 485          */ 486 487         if (rContext->dwVersion == IFD_HVERSION_1_0) 488         { 489                 if (rv == IFD_SUCCESS || rv == IFD_ICC_PRESENT) 490                 { 491                         short ret; 492 493                         dwTag = TAG_IFD_ATR; 494 495                         /* LOCK THIS CODE REGION */ 496                         (void)SYS_MutexLock(rContext->mMutex); 497 498                         ucValue[0] = rContext->dwSlot; 499                         (void)IFDSetCapabilities(rContext, TAG_IFD_SLOTNUM, 1, ucValue); 500 501 #ifndef PCSCLITE_STATIC_DRIVER 502                         rv = (*IFD_get_capabilities) (dwTag, pucAtr); 503 #else 504                         rv = IFD_Get_Capabilities(dwTag, pucAtr); 505 #endif 506 507                         /* END OF LOCKED REGION */ 508                         (void)SYS_MutexUnLock(rContext->mMutex); 509 510                         /* 511                          * FIX :: This is a temporary way to return the correct size 512                          * of the ATR since most of the drivers return MAX_ATR_SIZE 513                          */ 514 515                         ret = ATRDecodeAtr(&sSmartCard, pucAtr, MAX_ATR_SIZE); 516 517                         /* 518                          * Might be a memory card without an ATR 519                          */ 520                         if (ret == 0) 521                                 *pdwAtrLen = 0; 522                         else 523                                 *pdwAtrLen = sSmartCard.ATR.Length; 524                 } 525                 else 526                 { 527                         /* 528                          * No card is inserted - Atr length is 0 529                          */ 530                         *pdwAtrLen = 0; 531                 } 532                 /* 533                  * End of FIX 534                  */ 535         } 536 537         *pdwStatus = dwCardStatus; 538 539         return SCARD_S_SUCCESS; 540 }

正如482~485的注释所说的，要特别对待ifdhandler v1版本。

对于v1版本，在此处获取atr.

499行，设置读卡器的当前槽，502行，获取对应的atr.

515行，对获取的atr进行解码，ATRDecodeAtr 又是一个故事，以后再说。