/*============================================================================= xmlrpc_curl_transport =============================================================================== Curl-based client transport for Xmlrpc-c By Bryan Henderson 04.12.10. Contributed to the public domain by its author. =============================================================================*/ #include "xmlrpc_config.h" #include "bool.h" #include "mallocvar.h" #include "linklist.h" #include "casprintf.h" #include "xmlrpc.h" #include "xmlrpc_int.h" #include "xmlrpc_client.h" #include "xmlrpc_client_int.h" #include #include #include #include "xmlrpc_pthreads.h" #include #include #include #ifndef WIN32 # include #endif #if defined (WIN32) && defined(_DEBUG) # include # define new DEBUG_NEW # define malloc(size) _malloc_dbg( size, _NORMAL_BLOCK, __FILE__, __LINE__) # undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif /*WIN32 && _DEBUG*/ struct clientTransport { pthread_mutex_t listLock; struct list_head rpcList; /* List of all RPCs that exist for this transport. An RPC exists from the time the user requests it until the time the user acknowledges it is done. */ }; typedef struct { /* This is all stuff that really ought to be in the CURL object, but the Curl library is a little too simple for that. So we build a layer on top of it, and call it a "transaction," as distinct from the Curl "session" represented by the CURL object. */ CURL * curlSessionP; /* Handle for Curl library session object */ char curlError[CURL_ERROR_SIZE]; /* Error message from Curl */ struct curl_slist * headerList; /* The HTTP headers for the transaction */ const char * serverUrl; /* malloc'ed - belongs to this object */ } curlTransaction; typedef struct { struct list_head link; /* link in transport's list of RPCs */ curlTransaction * curlTransactionP; /* The object which does the HTTP transaction, with no knowledge of XML-RPC or Xmlrpc-c. */ xmlrpc_mem_block * responseXmlP; xmlrpc_bool threadExists; pthread_t thread; transport_asynch_complete complete; /* Routine to call to complete the RPC after it is complete HTTP-wise. NULL if none. */ struct call_info * callInfoP; /* User's identifier for this RPC */ } rpc; static size_t collect(void * const ptr, size_t const size, size_t const nmemb, FILE * const stream) { /*---------------------------------------------------------------------------- This is a Curl output function. Curl calls this to deliver the HTTP response body. Curl thinks it's writing to a POSIX stream. -----------------------------------------------------------------------------*/ xmlrpc_mem_block * const responseXmlP = (xmlrpc_mem_block *) stream; char * const buffer = ptr; size_t const length = nmemb * size; size_t retval; xmlrpc_env env; xmlrpc_env_init(&env); xmlrpc_mem_block_append(&env, responseXmlP, buffer, length); if (env.fault_occurred) retval = (size_t)-1; else /* Really? Shouldn't it be like fread() and return 'nmemb'? */ retval = length; return retval; } static void initWindowsStuff(xmlrpc_env * const envP) { #if defined (WIN32) /* This is CRITICAL so that cURL-Win32 works properly! */ WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(1, 1); err = WSAStartup(wVersionRequested, &wsaData); if (LOBYTE(wsaData.wVersion) != 1 || HIBYTE( wsaData.wVersion) != 1) { /* Tell the user that we couldn't find a useable */ /* winsock.dll. */ WSACleanup(); xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Winsock reported that " "it does not implement the requested version 1.1."); } #else if (0) envP->fault_occurred = TRUE; /* Avoid unused parm warning */ #endif } static void create(xmlrpc_env * const envP, int const flags ATTR_UNUSED, const char * const appname ATTR_UNUSED, const char * const appversion ATTR_UNUSED, struct clientTransport ** const handlePP) { /*---------------------------------------------------------------------------- This does the 'create' operation for a Curl client transport. -----------------------------------------------------------------------------*/ struct clientTransport * transportP; initWindowsStuff(envP); MALLOCVAR(transportP); if (transportP == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Unable to allocate transport descriptor."); else { pthread_mutex_init(&transportP->listLock, NULL); list_make_empty(&transportP->rpcList); /* * This is the main global constructor for the app. Call this before * _any_ libcurl usage. If this fails, *NO* libcurl functions may be * used, or havoc may be the result. */ curl_global_init(CURL_GLOBAL_ALL); /* The above makes it look like Curl is not re-entrant. We should check into that. */ *handlePP = transportP; } } static void termWindowStuff(void) { #if defined (WIN32) WSACleanup(); #endif } static void destroy(struct clientTransport * const clientTransportP) { /*---------------------------------------------------------------------------- This does the 'destroy' operation for a Libwww client transport. -----------------------------------------------------------------------------*/ XMLRPC_ASSERT(clientTransportP != NULL); XMLRPC_ASSERT(list_is_empty(&clientTransportP->rpcList)); pthread_mutex_destroy(&clientTransportP->listLock); curl_global_cleanup(); termWindowStuff(); free(clientTransportP); } static void createCurlHeaderList(xmlrpc_env * const envP, xmlrpc_server_info * const serverP, struct curl_slist ** const headerListP) { struct curl_slist * headerList; headerList = NULL; /* initial value */ headerList = curl_slist_append(headerList, "Content-Type: text/xml"); if (headerList == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Could not add header. curl_slist_append() failed."); else { /* Send an authorization header if we need one. */ if (serverP->_http_basic_auth) { /* Make the authentication header "Authorization: " */ /* we need 15 + length of _http_basic_auth + 1 for null */ char * const authHeader = malloc(strlen(serverP->_http_basic_auth) + 15 + 1); if (authHeader == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Couldn't allocate memory for authentication header"); else { memcpy(authHeader,"Authorization: ", 15); memcpy(authHeader + 15, serverP->_http_basic_auth, strlen(serverP->_http_basic_auth) + 1); headerList = curl_slist_append(headerList, authHeader); if (headerList == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Could not add authentication header. " "curl_slist_append() failed."); free(authHeader); } } if (envP->fault_occurred) free(headerList); } *headerListP = headerList; } static void setupCurlSession(xmlrpc_env * const envP, CURL * const curlSessionP, curlTransaction * const curlTransactionP, xmlrpc_mem_block * const callXmlP, xmlrpc_mem_block * const responseXmlP) { curl_easy_setopt(curlSessionP, CURLOPT_POST, 1 ); curl_easy_setopt(curlSessionP, CURLOPT_URL, curlTransactionP->serverUrl); XMLRPC_MEMBLOCK_APPEND(char, envP, callXmlP, "\0", 1); if (!envP->fault_occurred) { curl_easy_setopt(curlSessionP, CURLOPT_POSTFIELDS, XMLRPC_MEMBLOCK_CONTENTS(char, callXmlP)); curl_easy_setopt(curlSessionP, CURLOPT_FILE, responseXmlP); curl_easy_setopt(curlSessionP, CURLOPT_HEADER, 0 ); curl_easy_setopt(curlSessionP, CURLOPT_WRITEFUNCTION, collect); curl_easy_setopt(curlSessionP, CURLOPT_ERRORBUFFER, curlTransactionP->curlError); curl_easy_setopt(curlSessionP, CURLOPT_NOPROGRESS, 1); curl_easy_setopt(curlSessionP, CURLOPT_HTTPHEADER, curlTransactionP->headerList); } } static void createCurlTransaction(xmlrpc_env * const envP, xmlrpc_server_info * const serverP, xmlrpc_mem_block * const callXmlP, xmlrpc_mem_block * const responseXmlP, curlTransaction ** const curlTransactionPP) { curlTransaction * curlTransactionP; MALLOCVAR(curlTransactionP); if (curlTransactionP == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "No memory to create Curl transaction."); else { CURL * const curlSessionP = curl_easy_init(); if (curlSessionP == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Could not create Curl session. curl_easy_init() failed."); else { curlTransactionP->curlSessionP = curlSessionP; curlTransactionP->serverUrl = strdup(serverP->_server_url); if (curlTransactionP->serverUrl == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Out of memory to store server URL."); else { createCurlHeaderList(envP, serverP, &curlTransactionP->headerList); if (!envP->fault_occurred) setupCurlSession(envP, curlSessionP, curlTransactionP, callXmlP, responseXmlP); if (envP->fault_occurred) strfree(curlTransactionP->serverUrl); } if (envP->fault_occurred) curl_easy_cleanup(curlSessionP); } if (envP->fault_occurred) free(curlTransactionP); } *curlTransactionPP = curlTransactionP; } static void destroyCurlTransaction(curlTransaction * const curlTransactionP) { curl_slist_free_all(curlTransactionP->headerList); strfree(curlTransactionP->serverUrl); curl_easy_cleanup(curlTransactionP->curlSessionP); } static void performCurlTransaction(xmlrpc_env * const envP, curlTransaction * const curlTransactionP) { CURL * const curlSessionP = curlTransactionP->curlSessionP; CURLcode res; res = curl_easy_perform(curlSessionP); if (res != CURLE_OK) xmlrpc_env_set_fault_formatted( envP, XMLRPC_NETWORK_ERROR, "Curl failed to perform " "HTTP POST request. curl_easy_perform() says: %s", curlTransactionP->curlError); else { CURLcode res; long http_result; res = curl_easy_getinfo(curlSessionP, CURLINFO_HTTP_CODE, &http_result); if (res != CURLE_OK) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Curl performed the HTTP POST request, but was " "unable to say what the HTTP result code was. " "curl_easy_getinfo(CURLINFO_HTTP_CODE) says: %s", curlTransactionP->curlError); else { if (http_result != 200) xmlrpc_env_set_fault_formatted( envP, XMLRPC_NETWORK_ERROR, "HTTP response: %ld", http_result); } } } static void doAsyncRpc2(void * const arg) { rpc * const rpcP = arg; xmlrpc_env env; xmlrpc_env_init(&env); performCurlTransaction(&env, rpcP->curlTransactionP); rpcP->complete(rpcP->callInfoP, rpcP->responseXmlP, env); xmlrpc_env_clean(&env); } #ifdef WIN32 static unsigned __stdcall doAsyncRpc(void * arg) { doAsyncRpc2(arg); return 0; } #else static void * doAsyncRpc(void * arg) { doAsyncRpc2(arg); return NULL; } #endif static void createRpcThread(xmlrpc_env * const envP, rpc * const rpcP, pthread_t * const threadP) { int rc; rc = pthread_create(threadP, NULL, doAsyncRpc, rpcP); switch (rc) { case 0: break; case EAGAIN: xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "pthread_create() failed: System Resources exceeded."); break; case EINVAL: xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "pthread_create() failed: Param Error for attr."); break; case ENOMEM: xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "pthread_create() failed: No memory for new thread."); break; default: xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "pthread_create() failed: Unrecognized error code %d.", rc); break; } } static void rpcCreate(xmlrpc_env * const envP, struct clientTransport * const clientTransportP, xmlrpc_server_info * const serverP, xmlrpc_mem_block * const callXmlP, xmlrpc_mem_block * const responseXmlP, transport_asynch_complete complete, struct call_info * const callInfoP, rpc ** const rpcPP) { rpc * rpcP; MALLOCVAR(rpcP); if (rpcP == NULL) xmlrpc_env_set_fault_formatted( envP, XMLRPC_INTERNAL_ERROR, "Couldn't allocate memory for rpc object"); else { rpcP->callInfoP = callInfoP; rpcP->complete = complete; rpcP->responseXmlP = responseXmlP; rpcP->threadExists = FALSE; createCurlTransaction(envP, serverP, callXmlP, responseXmlP, &rpcP->curlTransactionP); if (!envP->fault_occurred) { if (complete) { createRpcThread(envP, rpcP, &rpcP->thread); if (!envP->fault_occurred) rpcP->threadExists = TRUE; } if (!envP->fault_occurred) { list_init_header(&rpcP->link, rpcP); pthread_mutex_lock(&clientTransportP->listLock); list_add_head(&clientTransportP->rpcList, &rpcP->link); pthread_mutex_unlock(&clientTransportP->listLock); } if (envP->fault_occurred) destroyCurlTransaction(rpcP->curlTransactionP); } if (envP->fault_occurred) free(rpcP); } *rpcPP = rpcP; } static void rpcDestroy(rpc * const rpcP) { XMLRPC_ASSERT_PTR_OK(rpcP); XMLRPC_ASSERT(!rpcP->threadExists); destroyCurlTransaction(rpcP->curlTransactionP); list_remove(&rpcP->link); free(rpcP); } static void sendRequest(xmlrpc_env * const envP, struct clientTransport * const clientTransportP, xmlrpc_server_info * const serverP, xmlrpc_mem_block * const callXmlP, transport_asynch_complete complete, struct call_info * const callInfoP) { /*---------------------------------------------------------------------------- Initiate an XML-RPC rpc asynchronously. Don't wait for it to go to the server. Unless we return failure, we arrange to have complete() called when the rpc completes. This does the 'send_request' operation for a Curl client transport. -----------------------------------------------------------------------------*/ rpc * rpcP; xmlrpc_mem_block * responseXmlP; responseXmlP = XMLRPC_MEMBLOCK_NEW(char, envP, 0); if (!envP->fault_occurred) { rpcCreate(envP, clientTransportP, serverP, callXmlP, responseXmlP, complete, callInfoP, &rpcP); if (envP->fault_occurred) XMLRPC_MEMBLOCK_FREE(char, responseXmlP); } /* The user's eventual finish_asynch call will destroy this RPC and response buffer */ } static void * finishRpc(struct list_head * const headerP, void * const context ATTR_UNUSED) { rpc * const rpcP = headerP->itemP; if (rpcP->threadExists) { void *status; int result; result = pthread_join(rpcP->thread, &status); rpcP->threadExists = FALSE; } XMLRPC_MEMBLOCK_FREE(char, rpcP->responseXmlP); rpcDestroy(rpcP); return NULL; } static void finishAsynch(struct clientTransport * const clientTransportP ATTR_UNUSED, enum timeoutType const timeoutType ATTR_UNUSED, timeout_t const timeout ATTR_UNUSED) { /*---------------------------------------------------------------------------- Wait for the threads of all outstanding RPCs to exit and destroy those RPCs. This does the 'finish_asynch' operation for a Curl client transport. -----------------------------------------------------------------------------*/ /* We ignore any timeout request. Some day, we should figure out how to set an alarm and interrupt running threads. */ pthread_mutex_lock(&clientTransportP->listLock); list_foreach(&clientTransportP->rpcList, finishRpc, NULL); pthread_mutex_unlock(&clientTransportP->listLock); } static void call(xmlrpc_env * const envP, struct clientTransport * const clientTransportP, xmlrpc_server_info * const serverP, xmlrpc_mem_block * const callXmlP, struct call_info * const callInfoP, xmlrpc_mem_block ** const responsePP) { xmlrpc_mem_block * responseXmlP; rpc * rpcP; XMLRPC_ASSERT_ENV_OK(envP); XMLRPC_ASSERT_PTR_OK(serverP); XMLRPC_ASSERT_PTR_OK(callXmlP); XMLRPC_ASSERT_PTR_OK(callInfoP); XMLRPC_ASSERT_PTR_OK(responsePP); responseXmlP = XMLRPC_MEMBLOCK_NEW(char, envP, 0); if (!envP->fault_occurred) { rpcCreate(envP, clientTransportP, serverP, callXmlP, responseXmlP, NULL, NULL, &rpcP); if (!envP->fault_occurred) { performCurlTransaction(envP, rpcP->curlTransactionP); *responsePP = responseXmlP; rpcDestroy(rpcP); } if (envP->fault_occurred) XMLRPC_MEMBLOCK_FREE(char, responseXmlP); } } struct clientTransportOps xmlrpc_curl_transport_ops = { &create, &destroy, &sendRequest, &call, &finishAsynch, };