diff options
Diffstat (limited to '')
| -rw-r--r-- | src/input/plugins/CurlInputPlugin.cxx | 876 |
1 files changed, 876 insertions, 0 deletions
diff --git a/src/input/plugins/CurlInputPlugin.cxx b/src/input/plugins/CurlInputPlugin.cxx new file mode 100644 index 000000000..abb7e312c --- /dev/null +++ b/src/input/plugins/CurlInputPlugin.cxx @@ -0,0 +1,876 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "CurlInputPlugin.hxx" +#include "../AsyncInputStream.hxx" +#include "../IcyInputStream.hxx" +#include "../InputPlugin.hxx" +#include "config/ConfigGlobal.hxx" +#include "config/ConfigData.hxx" +#include "tag/Tag.hxx" +#include "tag/TagBuilder.hxx" +#include "event/SocketMonitor.hxx" +#include "event/TimeoutMonitor.hxx" +#include "event/Call.hxx" +#include "IOThread.hxx" +#include "util/ASCII.hxx" +#include "util/StringUtil.hxx" +#include "util/NumberParser.hxx" +#include "util/CircularBuffer.hxx" +#include "util/HugeAllocator.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "Log.hxx" + +#include <assert.h> +#include <string.h> + +#include <curl/curl.h> + +#if LIBCURL_VERSION_NUM < 0x071200 +#error libcurl is too old +#endif + +/** + * Do not buffer more than this number of bytes. It should be a + * reasonable limit that doesn't make low-end machines suffer too + * much, but doesn't cause stuttering on high-latency lines. + */ +static const size_t CURL_MAX_BUFFERED = 512 * 1024; + +/** + * Resume the stream at this number of bytes after it has been paused. + */ +static const size_t CURL_RESUME_AT = 384 * 1024; + +struct CurlInputStream final : public AsyncInputStream { + /* some buffers which were passed to libcurl, which we have + too free */ + char range[32]; + struct curl_slist *request_headers; + + /** the curl handles */ + CURL *easy; + + /** error message provided by libcurl */ + char error_buffer[CURL_ERROR_SIZE]; + + /** parser for icy-metadata */ + IcyInputStream *icy; + + CurlInputStream(const char *_url, Mutex &_mutex, Cond &_cond, + void *_buffer) + :AsyncInputStream(_url, _mutex, _cond, + _buffer, CURL_MAX_BUFFERED, + CURL_RESUME_AT), + request_headers(nullptr), + icy(new IcyInputStream(this)) {} + + ~CurlInputStream(); + + CurlInputStream(const CurlInputStream &) = delete; + CurlInputStream &operator=(const CurlInputStream &) = delete; + + static InputStream *Open(const char *url, Mutex &mutex, Cond &cond, + Error &error); + + bool InitEasy(Error &error); + + /** + * Frees the current "libcurl easy" handle, and everything + * associated with it. + * + * Runs in the I/O thread. + */ + void FreeEasy(); + + /** + * Frees the current "libcurl easy" handle, and everything associated + * with it. + * + * The mutex must not be locked. + */ + void FreeEasyIndirect(); + + /** + * Called when a new response begins. This is used to discard + * headers from previous responses (for example authentication + * and redirects). + */ + void ResponseBoundary(); + + void HeaderReceived(const char *name, std::string &&value); + + size_t DataReceived(const void *ptr, size_t size); + + /** + * A HTTP request is finished. + * + * Runs in the I/O thread. The caller must not hold locks. + */ + void RequestDone(CURLcode result, long status); + + /* virtual methods from AsyncInputStream */ + virtual void DoResume() override; + virtual void DoSeek(offset_type new_offset) override; +}; + +class CurlMulti; + +/** + * Monitor for one socket created by CURL. + */ +class CurlSocket final : SocketMonitor { + CurlMulti &multi; + +public: + CurlSocket(CurlMulti &_multi, EventLoop &_loop, int _fd) + :SocketMonitor(_fd, _loop), multi(_multi) {} + + ~CurlSocket() { + /* TODO: sometimes, CURL uses CURL_POLL_REMOVE after + closing the socket, and sometimes, it uses + CURL_POLL_REMOVE just to move the (still open) + connection to the pool; in the first case, + Abandon() would be most appropriate, but it breaks + the second case - is that a CURL bug? is there a + better solution? */ + } + + /** + * Callback function for CURLMOPT_SOCKETFUNCTION. + */ + static int SocketFunction(CURL *easy, + curl_socket_t s, int action, + void *userp, void *socketp); + + virtual bool OnSocketReady(unsigned flags) override; + +private: + static constexpr int FlagsToCurlCSelect(unsigned flags) { + return (flags & (READ | HANGUP) ? CURL_CSELECT_IN : 0) | + (flags & WRITE ? CURL_CSELECT_OUT : 0) | + (flags & ERROR ? CURL_CSELECT_ERR : 0); + } + + gcc_const + static unsigned CurlPollToFlags(int action) { + switch (action) { + case CURL_POLL_NONE: + return 0; + + case CURL_POLL_IN: + return READ; + + case CURL_POLL_OUT: + return WRITE; + + case CURL_POLL_INOUT: + return READ|WRITE; + } + + assert(false); + gcc_unreachable(); + } +}; + +/** + * Manager for the global CURLM object. + */ +class CurlMulti final : private TimeoutMonitor { + CURLM *const multi; + +public: + CurlMulti(EventLoop &_loop, CURLM *_multi); + + ~CurlMulti() { + curl_multi_cleanup(multi); + } + + bool Add(CurlInputStream *c, Error &error); + void Remove(CurlInputStream *c); + + /** + * Check for finished HTTP responses. + * + * Runs in the I/O thread. The caller must not hold locks. + */ + void ReadInfo(); + + void Assign(curl_socket_t fd, CurlSocket &cs) { + curl_multi_assign(multi, fd, &cs); + } + + void SocketAction(curl_socket_t fd, int ev_bitmask); + + void InvalidateSockets() { + SocketAction(CURL_SOCKET_TIMEOUT, 0); + } + + /** + * This is a kludge to allow pausing/resuming a stream with + * libcurl < 7.32.0. Read the curl_easy_pause manpage for + * more information. + */ + void ResumeSockets() { + int running_handles; + curl_multi_socket_all(multi, &running_handles); + } + +private: + static int TimerFunction(CURLM *multi, long timeout_ms, void *userp); + + virtual void OnTimeout() override; +}; + +/** + * libcurl version number encoded in a 24 bit integer. + */ +static unsigned curl_version_num; + +/** libcurl should accept "ICY 200 OK" */ +static struct curl_slist *http_200_aliases; + +/** HTTP proxy settings */ +static const char *proxy, *proxy_user, *proxy_password; +static unsigned proxy_port; + +static bool verify_peer, verify_host; + +static CurlMulti *curl_multi; + +static constexpr Domain http_domain("http"); +static constexpr Domain curl_domain("curl"); +static constexpr Domain curlm_domain("curlm"); + +CurlMulti::CurlMulti(EventLoop &_loop, CURLM *_multi) + :TimeoutMonitor(_loop), multi(_multi) +{ + curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, + CurlSocket::SocketFunction); + curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, this); + + curl_multi_setopt(multi, CURLMOPT_TIMERFUNCTION, TimerFunction); + curl_multi_setopt(multi, CURLMOPT_TIMERDATA, this); +} + +/** + * Find a request by its CURL "easy" handle. + * + * Runs in the I/O thread. No lock needed. + */ +gcc_pure +static CurlInputStream * +input_curl_find_request(CURL *easy) +{ + assert(io_thread_inside()); + + void *p; + CURLcode code = curl_easy_getinfo(easy, CURLINFO_PRIVATE, &p); + if (code != CURLE_OK) + return nullptr; + + return (CurlInputStream *)p; +} + +void +CurlInputStream::DoResume() +{ + assert(io_thread_inside()); + + mutex.unlock(); + + curl_easy_pause(easy, CURLPAUSE_CONT); + + if (curl_version_num < 0x072000) + /* libcurl older than 7.32.0 does not update + its sockets after curl_easy_pause(); force + libcurl to do it now */ + curl_multi->ResumeSockets(); + + curl_multi->InvalidateSockets(); + + mutex.lock(); +} + +int +CurlSocket::SocketFunction(gcc_unused CURL *easy, + curl_socket_t s, int action, + void *userp, void *socketp) { + CurlMulti &multi = *(CurlMulti *)userp; + CurlSocket *cs = (CurlSocket *)socketp; + + assert(io_thread_inside()); + + if (action == CURL_POLL_REMOVE) { + delete cs; + return 0; + } + + if (cs == nullptr) { + cs = new CurlSocket(multi, io_thread_get(), s); + multi.Assign(s, *cs); + } else { +#ifdef USE_EPOLL + /* when using epoll, we need to unregister the socket + each time this callback is invoked, because older + CURL versions may omit the CURL_POLL_REMOVE call + when the socket has been closed and recreated with + the same file number (bug found in CURL 7.26, CURL + 7.33 not affected); in that case, epoll refuses the + EPOLL_CTL_MOD because it does not know the new + socket yet */ + cs->Cancel(); +#endif + } + + unsigned flags = CurlPollToFlags(action); + if (flags != 0) + cs->Schedule(flags); + return 0; +} + +bool +CurlSocket::OnSocketReady(unsigned flags) +{ + assert(io_thread_inside()); + + multi.SocketAction(Get(), FlagsToCurlCSelect(flags)); + return true; +} + +/** + * Runs in the I/O thread. No lock needed. + */ +inline bool +CurlMulti::Add(CurlInputStream *c, Error &error) +{ + assert(io_thread_inside()); + assert(c != nullptr); + assert(c->easy != nullptr); + + CURLMcode mcode = curl_multi_add_handle(multi, c->easy); + if (mcode != CURLM_OK) { + error.Format(curlm_domain, mcode, + "curl_multi_add_handle() failed: %s", + curl_multi_strerror(mcode)); + return false; + } + + InvalidateSockets(); + return true; +} + +/** + * Call input_curl_easy_add() in the I/O thread. May be called from + * any thread. Caller must not hold a mutex. + */ +static bool +input_curl_easy_add_indirect(CurlInputStream *c, Error &error) +{ + assert(c != nullptr); + assert(c->easy != nullptr); + + bool result; + BlockingCall(io_thread_get(), [c, &error, &result](){ + result = curl_multi->Add(c, error); + }); + return result; +} + +inline void +CurlMulti::Remove(CurlInputStream *c) +{ + curl_multi_remove_handle(multi, c->easy); +} + +void +CurlInputStream::FreeEasy() +{ + assert(io_thread_inside()); + + if (easy == nullptr) + return; + + curl_multi->Remove(this); + + curl_easy_cleanup(easy); + easy = nullptr; + + curl_slist_free_all(request_headers); + request_headers = nullptr; +} + +void +CurlInputStream::FreeEasyIndirect() +{ + BlockingCall(io_thread_get(), [this](){ + FreeEasy(); + curl_multi->InvalidateSockets(); + }); + + assert(easy == nullptr); +} + +inline void +CurlInputStream::RequestDone(CURLcode result, long status) +{ + assert(io_thread_inside()); + assert(!postponed_error.IsDefined()); + + FreeEasy(); + AsyncInputStream::SetClosed(); + + const ScopeLock protect(mutex); + + if (result != CURLE_OK) { + postponed_error.Format(curl_domain, result, + "curl failed: %s", error_buffer); + } else if (status < 200 || status >= 300) { + postponed_error.Format(http_domain, status, + "got HTTP status %ld", + status); + } + + if (IsSeekPending()) + SeekDone(); + else if (!IsReady()) + SetReady(); +} + +static void +input_curl_handle_done(CURL *easy_handle, CURLcode result) +{ + CurlInputStream *c = input_curl_find_request(easy_handle); + assert(c != nullptr); + + long status = 0; + curl_easy_getinfo(easy_handle, CURLINFO_RESPONSE_CODE, &status); + + c->RequestDone(result, status); +} + +void +CurlMulti::SocketAction(curl_socket_t fd, int ev_bitmask) +{ + int running_handles; + CURLMcode mcode = curl_multi_socket_action(multi, fd, ev_bitmask, + &running_handles); + if (mcode != CURLM_OK) + FormatError(curlm_domain, + "curl_multi_socket_action() failed: %s", + curl_multi_strerror(mcode)); + + ReadInfo(); +} + +/** + * Check for finished HTTP responses. + * + * Runs in the I/O thread. The caller must not hold locks. + */ +inline void +CurlMulti::ReadInfo() +{ + assert(io_thread_inside()); + + CURLMsg *msg; + int msgs_in_queue; + + while ((msg = curl_multi_info_read(multi, + &msgs_in_queue)) != nullptr) { + if (msg->msg == CURLMSG_DONE) + input_curl_handle_done(msg->easy_handle, msg->data.result); + } +} + +int +CurlMulti::TimerFunction(gcc_unused CURLM *_multi, long timeout_ms, void *userp) +{ + CurlMulti &multi = *(CurlMulti *)userp; + assert(_multi == multi.multi); + + if (timeout_ms < 0) { + multi.Cancel(); + return 0; + } + + if (timeout_ms >= 0 && timeout_ms < 10) + /* CURL 7.21.1 likes to report "timeout=0", which + means we're running in a busy loop. Quite a bad + idea to waste so much CPU. Let's use a lower limit + of 10ms. */ + timeout_ms = 10; + + multi.Schedule(timeout_ms); + return 0; +} + +void +CurlMulti::OnTimeout() +{ + SocketAction(CURL_SOCKET_TIMEOUT, 0); +} + +/* + * InputPlugin methods + * + */ + +static InputPlugin::InitResult +input_curl_init(const config_param ¶m, Error &error) +{ + CURLcode code = curl_global_init(CURL_GLOBAL_ALL); + if (code != CURLE_OK) { + error.Format(curl_domain, code, + "curl_global_init() failed: %s", + curl_easy_strerror(code)); + return InputPlugin::InitResult::UNAVAILABLE; + } + + const auto version_info = curl_version_info(CURLVERSION_FIRST); + if (version_info != nullptr) { + FormatDebug(curl_domain, "version %s", version_info->version); + if (version_info->features & CURL_VERSION_SSL) + FormatDebug(curl_domain, "with %s", + version_info->ssl_version); + + curl_version_num = version_info->version_num; + } + + http_200_aliases = curl_slist_append(http_200_aliases, "ICY 200 OK"); + + proxy = param.GetBlockValue("proxy"); + proxy_port = param.GetBlockValue("proxy_port", 0u); + proxy_user = param.GetBlockValue("proxy_user"); + proxy_password = param.GetBlockValue("proxy_password"); + + if (proxy == nullptr) { + /* deprecated proxy configuration */ + proxy = config_get_string(CONF_HTTP_PROXY_HOST, nullptr); + proxy_port = config_get_positive(CONF_HTTP_PROXY_PORT, 0); + proxy_user = config_get_string(CONF_HTTP_PROXY_USER, nullptr); + proxy_password = config_get_string(CONF_HTTP_PROXY_PASSWORD, + ""); + } + + verify_peer = param.GetBlockValue("verify_peer", true); + verify_host = param.GetBlockValue("verify_host", true); + + CURLM *multi = curl_multi_init(); + if (multi == nullptr) { + curl_slist_free_all(http_200_aliases); + curl_global_cleanup(); + error.Set(curl_domain, 0, "curl_multi_init() failed"); + return InputPlugin::InitResult::UNAVAILABLE; + } + + curl_multi = new CurlMulti(io_thread_get(), multi); + return InputPlugin::InitResult::SUCCESS; +} + +static void +input_curl_finish(void) +{ + BlockingCall(io_thread_get(), [](){ + delete curl_multi; + }); + + curl_slist_free_all(http_200_aliases); + http_200_aliases = nullptr; + + curl_global_cleanup(); +} + +CurlInputStream::~CurlInputStream() +{ + FreeEasyIndirect(); +} + +inline void +CurlInputStream::ResponseBoundary() +{ + /* undo all effects of HeaderReceived() because the previous + response was not applicable for this stream */ + + if (IsSeekPending()) + /* don't update metadata while seeking */ + return; + + seekable = false; + size = UNKNOWN_SIZE; + ClearMimeType(); + ClearTag(); + + // TODO: reset the IcyInputStream? +} + +inline void +CurlInputStream::HeaderReceived(const char *name, std::string &&value) +{ + if (IsSeekPending()) + /* don't update metadata while seeking */ + return; + + if (StringEqualsCaseASCII(name, "accept-ranges")) { + /* a stream with icy-metadata is not seekable */ + if (!icy->IsEnabled()) + seekable = true; + } else if (StringEqualsCaseASCII(name, "content-length")) { + size = offset + ParseUint64(value.c_str()); + } else if (StringEqualsCaseASCII(name, "content-type")) { + SetMimeType(std::move(value)); + } else if (StringEqualsCaseASCII(name, "icy-name") || + StringEqualsCaseASCII(name, "ice-name") || + StringEqualsCaseASCII(name, "x-audiocast-name")) { + TagBuilder tag_builder; + tag_builder.AddItem(TAG_NAME, value.c_str()); + + SetTag(tag_builder.CommitNew()); + } else if (StringEqualsCaseASCII(name, "icy-metaint")) { + if (icy->IsEnabled()) + return; + + size_t icy_metaint = ParseUint64(value.c_str()); + FormatDebug(curl_domain, "icy-metaint=%zu", icy_metaint); + + if (icy_metaint > 0) { + icy->Enable(icy_metaint); + + /* a stream with icy-metadata is not + seekable */ + seekable = false; + } + } +} + +/** called by curl when new data is available */ +static size_t +input_curl_headerfunction(void *ptr, size_t size, size_t nmemb, void *stream) +{ + CurlInputStream &c = *(CurlInputStream *)stream; + + size *= nmemb; + + const char *header = (const char *)ptr; + if (size > 5 && memcmp(header, "HTTP/", 5) == 0) { + c.ResponseBoundary(); + return size; + } + + const char *end = header + size; + + char name[64]; + + const char *value = (const char *)memchr(header, ':', size); + if (value == nullptr || (size_t)(value - header) >= sizeof(name)) + return size; + + memcpy(name, header, value - header); + name[value - header] = 0; + + /* skip the colon */ + + ++value; + + /* strip the value */ + + value = StripLeft(value, end); + end = StripRight(value, end); + + c.HeaderReceived(name, std::string(value, end)); + return size; +} + +inline size_t +CurlInputStream::DataReceived(const void *ptr, size_t received_size) +{ + assert(received_size > 0); + + const ScopeLock protect(mutex); + + if (IsSeekPending()) + SeekDone(); + + if (received_size > GetBufferSpace()) { + AsyncInputStream::Pause(); + return CURL_WRITEFUNC_PAUSE; + } + + AppendToBuffer(ptr, received_size); + return received_size; +} + +/** called by curl when new data is available */ +static size_t +input_curl_writefunction(void *ptr, size_t size, size_t nmemb, void *stream) +{ + CurlInputStream &c = *(CurlInputStream *)stream; + + size *= nmemb; + if (size == 0) + return 0; + + return c.DataReceived(ptr, size); +} + +bool +CurlInputStream::InitEasy(Error &error) +{ + easy = curl_easy_init(); + if (easy == nullptr) { + error.Set(curl_domain, "curl_easy_init() failed"); + return false; + } + + curl_easy_setopt(easy, CURLOPT_PRIVATE, (void *)this); + curl_easy_setopt(easy, CURLOPT_USERAGENT, + "Music Player Daemon " VERSION); + curl_easy_setopt(easy, CURLOPT_HEADERFUNCTION, + input_curl_headerfunction); + curl_easy_setopt(easy, CURLOPT_WRITEHEADER, this); + curl_easy_setopt(easy, CURLOPT_WRITEFUNCTION, + input_curl_writefunction); + curl_easy_setopt(easy, CURLOPT_WRITEDATA, this); + curl_easy_setopt(easy, CURLOPT_HTTP200ALIASES, http_200_aliases); + curl_easy_setopt(easy, CURLOPT_FOLLOWLOCATION, 1l); + curl_easy_setopt(easy, CURLOPT_NETRC, 1l); + curl_easy_setopt(easy, CURLOPT_MAXREDIRS, 5l); + curl_easy_setopt(easy, CURLOPT_FAILONERROR, 1l); + curl_easy_setopt(easy, CURLOPT_ERRORBUFFER, error_buffer); + curl_easy_setopt(easy, CURLOPT_NOPROGRESS, 1l); + curl_easy_setopt(easy, CURLOPT_NOSIGNAL, 1l); + curl_easy_setopt(easy, CURLOPT_CONNECTTIMEOUT, 10l); + + if (proxy != nullptr) + curl_easy_setopt(easy, CURLOPT_PROXY, proxy); + + if (proxy_port > 0) + curl_easy_setopt(easy, CURLOPT_PROXYPORT, (long)proxy_port); + + if (proxy_user != nullptr && proxy_password != nullptr) { + char proxy_auth_str[1024]; + snprintf(proxy_auth_str, sizeof(proxy_auth_str), + "%s:%s", + proxy_user, proxy_password); + curl_easy_setopt(easy, CURLOPT_PROXYUSERPWD, proxy_auth_str); + } + + curl_easy_setopt(easy, CURLOPT_SSL_VERIFYPEER, verify_peer ? 1l : 0l); + curl_easy_setopt(easy, CURLOPT_SSL_VERIFYHOST, verify_host ? 2l : 0l); + + CURLcode code = curl_easy_setopt(easy, CURLOPT_URL, GetURI()); + if (code != CURLE_OK) { + error.Format(curl_domain, code, + "curl_easy_setopt() failed: %s", + curl_easy_strerror(code)); + return false; + } + + request_headers = nullptr; + request_headers = curl_slist_append(request_headers, + "Icy-Metadata: 1"); + curl_easy_setopt(easy, CURLOPT_HTTPHEADER, request_headers); + + return true; +} + +void +CurlInputStream::DoSeek(offset_type new_offset) +{ + assert(IsReady()); + + /* close the old connection and open a new one */ + + mutex.unlock(); + + FreeEasyIndirect(); + + offset = new_offset; + if (offset == size) { + /* seek to EOF: simulate empty result; avoid + triggering a "416 Requested Range Not Satisfiable" + response */ + mutex.lock(); + SeekDone(); + return; + } + + Error error; + if (!InitEasy(postponed_error)) { + mutex.lock(); + PostponeError(std::move(error)); + return; + } + + /* send the "Range" header */ + + if (offset > 0) { + sprintf(range, "%lld-", (long long)offset); + curl_easy_setopt(easy, CURLOPT_RANGE, range); + } + + if (!input_curl_easy_add_indirect(this, error)) { + mutex.lock(); + PostponeError(std::move(error)); + return; + } + + mutex.lock(); + offset = new_offset; +} + +inline InputStream * +CurlInputStream::Open(const char *url, Mutex &mutex, Cond &cond, + Error &error) +{ + void *buffer = HugeAllocate(CURL_MAX_BUFFERED); + if (buffer == nullptr) { + error.Set(curl_domain, "Out of memory"); + return nullptr; + } + + CurlInputStream *c = new CurlInputStream(url, mutex, cond, buffer); + + if (!c->InitEasy(error) || !input_curl_easy_add_indirect(c, error)) { + delete c; + return nullptr; + } + + return c->icy; +} + +static InputStream * +input_curl_open(const char *url, Mutex &mutex, Cond &cond, + Error &error) +{ + if (memcmp(url, "http://", 7) != 0 && + memcmp(url, "https://", 8) != 0) + return nullptr; + + return CurlInputStream::Open(url, mutex, cond, error); +} + +const struct InputPlugin input_plugin_curl = { + "curl", + input_curl_init, + input_curl_finish, + input_curl_open, +}; |