/* vim: set expandtab ts=4 sw=4: */ /* * You may redistribute this program and/or modify it under the terms of * the GNU General Public License as published by the Free Software Foundation, * either version 3 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "client/AdminClient.h" #include "benc/serialization/standard/BencMessageReader.h" #include "benc/serialization/standard/BencMessageWriter.h" #include "benc/serialization/cloner/Cloner.h" #include "exception/Except.h" #include "util/Bits.h" #include "util/Endian.h" #include "util/Hex.h" #include "util/events/Timeout.h" #include "util/Identity.h" #include "wire/Message.h" #include "wire/Error.h" #include #include #include struct Request; typedef void (* AdminClient_RespHandler)(struct Request* req); struct Request { struct AdminClient_Result res; struct AdminClient_Promise* promise; AdminClient_RespHandler callback; struct Context* ctx; struct Allocator* alloc; /** Need a special allocator for the timeout so it can be axed before the request is complete */ struct Allocator* timeoutAlloc; struct Timeout* timeout; Dict* requestMessage; /** the handle in the ctx->outstandingRequests map */ uint32_t handle; Identity }; #define Map_NAME OfRequestByHandle #define Map_ENABLE_HANDLES #define Map_VALUE_TYPE struct Request* #include "util/Map.h" struct Context { struct AdminClient pub; struct EventBase* eventBase; struct Iface addrIface; struct Sockaddr* targetAddr; struct Log* logger; String* password; struct Map_OfRequestByHandle outstandingRequests; struct Allocator* alloc; Identity }; static int calculateAuth(Dict* message, String* password, String* cookieStr, struct Allocator* alloc) { // Calculate the hash of the password. String* hashHex = String_newBinary(NULL, 64, alloc); uint8_t passAndCookie[64]; uint32_t cookie = (cookieStr != NULL) ? strtoll(cookieStr->bytes, NULL, 10) : 0; snprintf((char*) passAndCookie, 64, "%s%u", password->bytes, cookie); uint8_t hash[32]; crypto_hash_sha256(hash, passAndCookie, CString_strlen((char*) passAndCookie)); Hex_encode((uint8_t*)hashHex->bytes, 64, hash, 32); Dict_putString(message, String_new("hash", alloc), hashHex, alloc); Dict_putString(message, String_new("cookie", alloc), cookieStr, alloc); // serialize the message with the password hash struct Message* msg = Message_new(0, AdminClient_MAX_MESSAGE_SIZE, alloc); Er_assert(BencMessageWriter_write(message, msg)); // calculate the hash of the message with the password hash crypto_hash_sha256(hash, msg->msgbytes, Message_getLength(msg)); // swap the hash of the message with the password hash into the location // where the password hash was. Hex_encode((uint8_t*)hashHex->bytes, 64, hash, 32); return 0; } static void done(struct Request* req, enum AdminClient_Error err) { req->res.err = err; Allocator_t* ra = req->timeoutAlloc; req->callback(req); if (ra == req->timeoutAlloc) { Allocator_free(req->timeoutAlloc); } } static void timeout(void* vreq) { done((struct Request*) vreq, AdminClient_Error_TIMEOUT); } static Iface_DEFUN receiveMessage(struct Message* msg, struct Iface* addrIface) { struct Context* ctx = Identity_containerOf(addrIface, struct Context, addrIface); struct Sockaddr_storage source; Er_assert(Message_epop(msg, &source, ctx->targetAddr->addrLen)); if (Bits_memcmp(&source, ctx->targetAddr, ctx->targetAddr->addrLen)) { Log_info(ctx->logger, "Got spurious message from [%s], expecting messages from [%s]", Sockaddr_print(&source.addr, Message_getAlloc(msg)), Sockaddr_print(ctx->targetAddr, Message_getAlloc(msg))); // The UDP interface can't make use of an error but we'll inform anyway return Error(msg, "INVALID source addr"); } // we don't yet know with which message this data belongs, // the message alloc lives the length of the message reception. struct Allocator* alloc = Allocator_child(Message_getAlloc(msg)); int origLen = Message_getLength(msg); Dict* d = NULL; const char* err = BencMessageReader_readNoExcept(msg, alloc, &d); if (err) { return Error(msg, "Error decoding benc: %s", err); } Er_assert(Message_eshift(msg, origLen)); String* txid = Dict_getStringC(d, "txid"); if (!txid || txid->len != 8) { return Error(msg, "INVALID missing or wrong size txid"); } // look up the result uint32_t handle = ~0u; Hex_decode((uint8_t*)&handle, 4, txid->bytes, 8); int idx = Map_OfRequestByHandle_indexForHandle(handle, &ctx->outstandingRequests); if (idx < 0) { return Error(msg, "INVALID no such handle"); } struct Request* req = ctx->outstandingRequests.values[idx]; // now this data will outlive the life of the message. Allocator_adopt(req->promise->alloc, alloc); req->res.responseDict = d; int len = (Message_getLength(msg) > AdminClient_MAX_MESSAGE_SIZE) ? AdminClient_MAX_MESSAGE_SIZE : Message_getLength(msg); Bits_memset(req->res.messageBytes, 0, AdminClient_MAX_MESSAGE_SIZE); Bits_memcpy(req->res.messageBytes, msg->msgbytes, len); done(req, AdminClient_Error_NONE); return NULL; } static int requestOnFree(struct Allocator_OnFreeJob* job) { struct Request* req = Identity_check((struct Request*) job->userData); int idx = Map_OfRequestByHandle_indexForHandle(req->handle, &req->ctx->outstandingRequests); if (idx > -1) { Map_OfRequestByHandle_remove(idx, &req->ctx->outstandingRequests); } return 0; } static struct Request* sendRaw(Dict* messageDict, struct AdminClient_Promise* promise, struct Context* ctx, String* cookie, AdminClient_RespHandler callback) { struct Allocator* reqAlloc = Allocator_child(promise->alloc); struct Request* req = Allocator_clone(reqAlloc, (&(struct Request) { .alloc = reqAlloc, .ctx = ctx, .promise = promise })); Identity_set(req); int idx = Map_OfRequestByHandle_put(&req, &ctx->outstandingRequests); req->handle = ctx->outstandingRequests.handles[idx]; String* id = String_newBinary(NULL, 8, req->alloc); Hex_encode(id->bytes, 8, (int8_t*) &req->handle, 4); Dict_putStringC(messageDict, "txid", id, req->alloc); if (cookie) { Assert_true(!calculateAuth(messageDict, ctx->password, cookie, req->alloc)); } struct Allocator* child = Allocator_child(req->alloc); struct Message* msg = Message_new(0, AdminClient_MAX_MESSAGE_SIZE + 256, child); Er_assert(BencMessageWriter_write(messageDict, msg)); req->timeoutAlloc = Allocator_child(req->alloc); req->timeout = Timeout_setTimeout(timeout, req, ctx->pub.millisecondsToWait, ctx->eventBase, req->timeoutAlloc); Allocator_onFree(req->timeoutAlloc, requestOnFree, req); req->callback = callback; Er_assert(Message_epush(msg, ctx->targetAddr, ctx->targetAddr->addrLen)); Iface_send(&ctx->addrIface, msg); Allocator_free(child); return req; } static void requestCallback(struct Request* req) { if (req->promise->callback) { req->promise->callback(req->promise, &req->res); } Allocator_free(req->promise->alloc); } static void cookieCallback(struct Request* req) { if (req->res.err) { requestCallback(req); return; } String* cookie = Dict_getStringC(req->res.responseDict, "cookie"); if (!cookie) { req->res.err = AdminClient_Error_NO_COOKIE; requestCallback(req); return; } Dict* message = req->requestMessage; sendRaw(message, req->promise, req->ctx, cookie, requestCallback); Allocator_free(req->alloc); } static struct AdminClient_Promise* doCall(Dict* message, struct Context* ctx, struct Allocator* alloc) { struct Allocator* promiseAlloc = Allocator_child(alloc); struct AdminClient_Promise* promise = Allocator_calloc(promiseAlloc, sizeof(struct AdminClient_Promise), 1); promise->alloc = promiseAlloc; Dict gc = Dict_CONST(String_CONST("q"), String_OBJ(String_CONST("cookie")), NULL); struct Request* req = sendRaw(&gc, promise, ctx, NULL, cookieCallback); req->requestMessage = Cloner_cloneDict(message, promiseAlloc); return promise; } struct AdminClient_Promise* AdminClient_rpcCall(String* function, Dict* args, struct AdminClient* client, struct Allocator* alloc) { struct Context* ctx = Identity_check((struct Context*) client); Dict a = (args) ? *args : NULL; Dict message = Dict_CONST( String_CONST("q"), String_OBJ(String_CONST("auth")), Dict_CONST( String_CONST("aq"), String_OBJ(function), Dict_CONST( String_CONST("args"), Dict_OBJ(&a), NULL ))); return doCall(&message, ctx, alloc); } char* AdminClient_errorString(enum AdminClient_Error err) { switch (err) { case AdminClient_Error_NONE: return "Success"; case AdminClient_Error_OVERLONG_RESPONSE: return "Overlong resonse message"; case AdminClient_Error_ERROR_READING_FROM_SOCKET: return "Error reading from socket, check errno."; case AdminClient_Error_SOCKET_NOT_READY: return "Socket not ready for reading"; case AdminClient_Error_DESERIALIZATION_FAILED: return "Failed to deserialize response"; case AdminClient_Error_SERIALIZATION_FAILED: return "Failed to serialize request"; case AdminClient_Error_TIMEOUT: return "Timed out waiting for a response"; case AdminClient_Error_NO_COOKIE: return "Cookie request returned with no cookie"; default: return "Internal error"; }; } struct AdminClient* AdminClient_new(AddrIface_t* ai, struct Sockaddr* connectToAddress, String* adminPassword, struct EventBase* eventBase, struct Log* logger, struct Allocator* alloc) { struct Context* context = Allocator_clone(alloc, (&(struct Context) { .eventBase = eventBase, .logger = logger, .password = adminPassword, .pub = { .millisecondsToWait = 5000, }, .outstandingRequests = { .allocator = alloc }, .alloc = alloc })); context->addrIface.send = receiveMessage; Identity_set(context); context->targetAddr = Sockaddr_clone(connectToAddress, alloc); if (Sockaddr_getFamily(context->targetAddr) == Sockaddr_AF_INET) { uint8_t* addrBytes; int len = Sockaddr_getAddress(context->targetAddr, &addrBytes); if (Bits_isZero(addrBytes, len)) { // 127.0.0.1 uint32_t loopback = Endian_hostToBigEndian32(0x7f000001); Bits_memcpy(addrBytes, &loopback, 4); } } Log_debug(logger, "Connecting to [%s]", Sockaddr_print(context->targetAddr, alloc)); Iface_plumb(ai->iface, &context->addrIface); return &context->pub; }