1080 lines
31 KiB
C
1080 lines
31 KiB
C
/*
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* QEMU Block driver for CURL images
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*
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* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "block/block_int.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "crypto/secret.h"
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#include <curl/curl.h>
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#include "qemu/cutils.h"
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#include "trace.h"
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// #define DEBUG_VERBOSE
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#define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
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CURLPROTO_FTP | CURLPROTO_FTPS)
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#define CURL_NUM_STATES 8
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#define CURL_NUM_ACB 8
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#define CURL_TIMEOUT_MAX 10000
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#define CURL_BLOCK_OPT_URL "url"
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#define CURL_BLOCK_OPT_READAHEAD "readahead"
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#define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
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#define CURL_BLOCK_OPT_TIMEOUT "timeout"
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#define CURL_BLOCK_OPT_COOKIE "cookie"
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#define CURL_BLOCK_OPT_COOKIE_SECRET "cookie-secret"
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#define CURL_BLOCK_OPT_USERNAME "username"
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#define CURL_BLOCK_OPT_PASSWORD_SECRET "password-secret"
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#define CURL_BLOCK_OPT_PROXY_USERNAME "proxy-username"
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#define CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET "proxy-password-secret"
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#define CURL_BLOCK_OPT_READAHEAD_DEFAULT (256 * 1024)
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#define CURL_BLOCK_OPT_SSLVERIFY_DEFAULT true
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#define CURL_BLOCK_OPT_TIMEOUT_DEFAULT 5
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struct BDRVCURLState;
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struct CURLState;
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static bool libcurl_initialized;
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typedef struct CURLAIOCB {
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Coroutine *co;
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QEMUIOVector *qiov;
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uint64_t offset;
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uint64_t bytes;
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int ret;
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size_t start;
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size_t end;
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} CURLAIOCB;
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typedef struct CURLSocket {
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int fd;
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struct BDRVCURLState *s;
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} CURLSocket;
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typedef struct CURLState
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{
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struct BDRVCURLState *s;
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CURLAIOCB *acb[CURL_NUM_ACB];
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CURL *curl;
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char *orig_buf;
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uint64_t buf_start;
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size_t buf_off;
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size_t buf_len;
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char range[128];
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char errmsg[CURL_ERROR_SIZE];
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char in_use;
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} CURLState;
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typedef struct BDRVCURLState {
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CURLM *multi;
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QEMUTimer timer;
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uint64_t len;
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CURLState states[CURL_NUM_STATES];
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GHashTable *sockets; /* GINT_TO_POINTER(fd) -> socket */
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char *url;
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size_t readahead_size;
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bool sslverify;
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uint64_t timeout;
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char *cookie;
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bool accept_range;
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AioContext *aio_context;
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QemuMutex mutex;
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CoQueue free_state_waitq;
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char *username;
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char *password;
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char *proxyusername;
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char *proxypassword;
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} BDRVCURLState;
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static void curl_clean_state(CURLState *s);
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static void curl_multi_do(void *arg);
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static gboolean curl_drop_socket(void *key, void *value, void *opaque)
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{
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CURLSocket *socket = value;
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BDRVCURLState *s = socket->s;
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aio_set_fd_handler(s->aio_context, socket->fd, false,
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NULL, NULL, NULL, NULL, NULL);
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return true;
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}
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static void curl_drop_all_sockets(GHashTable *sockets)
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{
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g_hash_table_foreach_remove(sockets, curl_drop_socket, NULL);
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}
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/* Called from curl_multi_do_locked, with s->mutex held. */
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static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
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{
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BDRVCURLState *s = opaque;
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trace_curl_timer_cb(timeout_ms);
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if (timeout_ms == -1) {
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timer_del(&s->timer);
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} else {
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int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
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timer_mod(&s->timer,
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qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
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}
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return 0;
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}
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/* Called from curl_multi_do_locked, with s->mutex held. */
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static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
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void *userp, void *sp)
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{
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BDRVCURLState *s;
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CURLState *state = NULL;
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CURLSocket *socket;
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curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
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s = state->s;
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socket = g_hash_table_lookup(s->sockets, GINT_TO_POINTER(fd));
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if (!socket) {
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socket = g_new0(CURLSocket, 1);
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socket->fd = fd;
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socket->s = s;
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g_hash_table_insert(s->sockets, GINT_TO_POINTER(fd), socket);
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}
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trace_curl_sock_cb(action, (int)fd);
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switch (action) {
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case CURL_POLL_IN:
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aio_set_fd_handler(s->aio_context, fd, false,
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curl_multi_do, NULL, NULL, NULL, socket);
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break;
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case CURL_POLL_OUT:
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aio_set_fd_handler(s->aio_context, fd, false,
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NULL, curl_multi_do, NULL, NULL, socket);
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break;
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case CURL_POLL_INOUT:
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aio_set_fd_handler(s->aio_context, fd, false,
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curl_multi_do, curl_multi_do,
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NULL, NULL, socket);
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break;
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case CURL_POLL_REMOVE:
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aio_set_fd_handler(s->aio_context, fd, false,
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NULL, NULL, NULL, NULL, NULL);
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break;
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}
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if (action == CURL_POLL_REMOVE) {
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g_hash_table_remove(s->sockets, GINT_TO_POINTER(fd));
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}
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return 0;
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}
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/* Called from curl_multi_do_locked, with s->mutex held. */
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static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
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{
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BDRVCURLState *s = opaque;
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size_t realsize = size * nmemb;
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const char *header = (char *)ptr;
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const char *end = header + realsize;
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const char *accept_ranges = "accept-ranges:";
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const char *bytes = "bytes";
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if (realsize >= strlen(accept_ranges)
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&& g_ascii_strncasecmp(header, accept_ranges,
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strlen(accept_ranges)) == 0) {
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char *p = strchr(header, ':') + 1;
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/* Skip whitespace between the header name and value. */
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while (p < end && *p && g_ascii_isspace(*p)) {
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p++;
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}
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if (end - p >= strlen(bytes)
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&& strncmp(p, bytes, strlen(bytes)) == 0) {
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/* Check that there is nothing but whitespace after the value. */
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p += strlen(bytes);
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while (p < end && *p && g_ascii_isspace(*p)) {
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p++;
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}
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if (p == end || !*p) {
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s->accept_range = true;
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}
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}
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}
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return realsize;
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}
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/* Called from curl_multi_do_locked, with s->mutex held. */
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static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
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{
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CURLState *s = ((CURLState*)opaque);
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size_t realsize = size * nmemb;
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trace_curl_read_cb(realsize);
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if (!s || !s->orig_buf) {
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goto read_end;
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}
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if (s->buf_off >= s->buf_len) {
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/* buffer full, read nothing */
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goto read_end;
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}
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realsize = MIN(realsize, s->buf_len - s->buf_off);
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memcpy(s->orig_buf + s->buf_off, ptr, realsize);
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s->buf_off += realsize;
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read_end:
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/* curl will error out if we do not return this value */
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return size * nmemb;
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}
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/* Called with s->mutex held. */
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static bool curl_find_buf(BDRVCURLState *s, uint64_t start, uint64_t len,
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CURLAIOCB *acb)
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{
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int i;
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uint64_t end = start + len;
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uint64_t clamped_end = MIN(end, s->len);
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uint64_t clamped_len = clamped_end - start;
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for (i=0; i<CURL_NUM_STATES; i++) {
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CURLState *state = &s->states[i];
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uint64_t buf_end = (state->buf_start + state->buf_off);
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uint64_t buf_fend = (state->buf_start + state->buf_len);
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if (!state->orig_buf)
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continue;
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if (!state->buf_off)
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continue;
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// Does the existing buffer cover our section?
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if ((start >= state->buf_start) &&
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(start <= buf_end) &&
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(clamped_end >= state->buf_start) &&
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(clamped_end <= buf_end))
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{
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char *buf = state->orig_buf + (start - state->buf_start);
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qemu_iovec_from_buf(acb->qiov, 0, buf, clamped_len);
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if (clamped_len < len) {
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qemu_iovec_memset(acb->qiov, clamped_len, 0, len - clamped_len);
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}
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acb->ret = 0;
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return true;
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}
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// Wait for unfinished chunks
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if (state->in_use &&
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(start >= state->buf_start) &&
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(start <= buf_fend) &&
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(clamped_end >= state->buf_start) &&
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(clamped_end <= buf_fend))
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{
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int j;
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acb->start = start - state->buf_start;
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acb->end = acb->start + clamped_len;
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for (j=0; j<CURL_NUM_ACB; j++) {
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if (!state->acb[j]) {
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state->acb[j] = acb;
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return true;
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}
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}
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}
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}
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return false;
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}
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/* Called with s->mutex held. */
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static void curl_multi_check_completion(BDRVCURLState *s)
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{
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int msgs_in_queue;
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/* Try to find done transfers, so we can free the easy
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* handle again. */
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for (;;) {
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CURLMsg *msg;
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msg = curl_multi_info_read(s->multi, &msgs_in_queue);
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/* Quit when there are no more completions */
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if (!msg)
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break;
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if (msg->msg == CURLMSG_DONE) {
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int i;
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CURLState *state = NULL;
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bool error = msg->data.result != CURLE_OK;
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curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
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(char **)&state);
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if (error) {
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static int errcount = 100;
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/* Don't lose the original error message from curl, since
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* it contains extra data.
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*/
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if (errcount > 0) {
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error_report("curl: %s", state->errmsg);
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if (--errcount == 0) {
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error_report("curl: further errors suppressed");
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}
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}
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}
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for (i = 0; i < CURL_NUM_ACB; i++) {
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CURLAIOCB *acb = state->acb[i];
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if (acb == NULL) {
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continue;
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}
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if (!error) {
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/* Assert that we have read all data */
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assert(state->buf_off >= acb->end);
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qemu_iovec_from_buf(acb->qiov, 0,
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state->orig_buf + acb->start,
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acb->end - acb->start);
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if (acb->end - acb->start < acb->bytes) {
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size_t offset = acb->end - acb->start;
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qemu_iovec_memset(acb->qiov, offset, 0,
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acb->bytes - offset);
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}
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}
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acb->ret = error ? -EIO : 0;
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state->acb[i] = NULL;
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qemu_mutex_unlock(&s->mutex);
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aio_co_wake(acb->co);
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qemu_mutex_lock(&s->mutex);
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}
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curl_clean_state(state);
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break;
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}
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}
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}
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/* Called with s->mutex held. */
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static void curl_multi_do_locked(CURLSocket *socket)
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{
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BDRVCURLState *s = socket->s;
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int running;
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int r;
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if (!s->multi) {
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return;
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}
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do {
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r = curl_multi_socket_action(s->multi, socket->fd, 0, &running);
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} while (r == CURLM_CALL_MULTI_PERFORM);
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}
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static void curl_multi_do(void *arg)
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{
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CURLSocket *socket = arg;
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BDRVCURLState *s = socket->s;
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qemu_mutex_lock(&s->mutex);
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curl_multi_do_locked(socket);
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curl_multi_check_completion(s);
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qemu_mutex_unlock(&s->mutex);
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}
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static void curl_multi_timeout_do(void *arg)
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{
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BDRVCURLState *s = (BDRVCURLState *)arg;
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int running;
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if (!s->multi) {
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return;
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}
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qemu_mutex_lock(&s->mutex);
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curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
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curl_multi_check_completion(s);
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qemu_mutex_unlock(&s->mutex);
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}
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/* Called with s->mutex held. */
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static CURLState *curl_find_state(BDRVCURLState *s)
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{
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CURLState *state = NULL;
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int i;
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for (i = 0; i < CURL_NUM_STATES; i++) {
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if (!s->states[i].in_use) {
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state = &s->states[i];
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state->in_use = 1;
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break;
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}
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}
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return state;
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}
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static int curl_init_state(BDRVCURLState *s, CURLState *state)
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{
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if (!state->curl) {
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state->curl = curl_easy_init();
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if (!state->curl) {
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return -EIO;
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}
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if (curl_easy_setopt(state->curl, CURLOPT_URL, s->url) ||
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curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
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(long) s->sslverify) ||
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curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYHOST,
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s->sslverify ? 2L : 0L)) {
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goto err;
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}
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if (s->cookie) {
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if (curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie)) {
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goto err;
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}
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}
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if (curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout) ||
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curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
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(void *)curl_read_cb) ||
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curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state) ||
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curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state) ||
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curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1) ||
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curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1) ||
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curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1) ||
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curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg) ||
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curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1)) {
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goto err;
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}
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if (s->username) {
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if (curl_easy_setopt(state->curl, CURLOPT_USERNAME, s->username)) {
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goto err;
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}
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}
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if (s->password) {
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if (curl_easy_setopt(state->curl, CURLOPT_PASSWORD, s->password)) {
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goto err;
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}
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}
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if (s->proxyusername) {
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if (curl_easy_setopt(state->curl,
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CURLOPT_PROXYUSERNAME, s->proxyusername)) {
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goto err;
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}
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}
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if (s->proxypassword) {
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if (curl_easy_setopt(state->curl,
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CURLOPT_PROXYPASSWORD, s->proxypassword)) {
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goto err;
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}
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}
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/* Restrict supported protocols to avoid security issues in the more
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* obscure protocols. For example, do not allow POP3/SMTP/IMAP see
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* CVE-2013-0249.
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*
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* Restricting protocols is only supported from 7.19.4 upwards.
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*/
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#if LIBCURL_VERSION_NUM >= 0x071304
|
|
if (curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS) ||
|
|
curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS)) {
|
|
goto err;
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG_VERBOSE
|
|
if (curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1)) {
|
|
goto err;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
state->s = s;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
curl_easy_cleanup(state->curl);
|
|
state->curl = NULL;
|
|
return -EIO;
|
|
}
|
|
|
|
/* Called with s->mutex held. */
|
|
static void curl_clean_state(CURLState *s)
|
|
{
|
|
int j;
|
|
for (j = 0; j < CURL_NUM_ACB; j++) {
|
|
assert(!s->acb[j]);
|
|
}
|
|
|
|
if (s->s->multi)
|
|
curl_multi_remove_handle(s->s->multi, s->curl);
|
|
|
|
s->in_use = 0;
|
|
|
|
qemu_co_enter_next(&s->s->free_state_waitq, &s->s->mutex);
|
|
}
|
|
|
|
static void curl_parse_filename(const char *filename, QDict *options,
|
|
Error **errp)
|
|
{
|
|
qdict_put_str(options, CURL_BLOCK_OPT_URL, filename);
|
|
}
|
|
|
|
static void curl_detach_aio_context(BlockDriverState *bs)
|
|
{
|
|
BDRVCURLState *s = bs->opaque;
|
|
int i;
|
|
|
|
WITH_QEMU_LOCK_GUARD(&s->mutex) {
|
|
curl_drop_all_sockets(s->sockets);
|
|
for (i = 0; i < CURL_NUM_STATES; i++) {
|
|
if (s->states[i].in_use) {
|
|
curl_clean_state(&s->states[i]);
|
|
}
|
|
if (s->states[i].curl) {
|
|
curl_easy_cleanup(s->states[i].curl);
|
|
s->states[i].curl = NULL;
|
|
}
|
|
g_free(s->states[i].orig_buf);
|
|
s->states[i].orig_buf = NULL;
|
|
}
|
|
if (s->multi) {
|
|
curl_multi_cleanup(s->multi);
|
|
s->multi = NULL;
|
|
}
|
|
}
|
|
|
|
timer_del(&s->timer);
|
|
}
|
|
|
|
static void curl_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context)
|
|
{
|
|
BDRVCURLState *s = bs->opaque;
|
|
|
|
aio_timer_init(new_context, &s->timer,
|
|
QEMU_CLOCK_REALTIME, SCALE_NS,
|
|
curl_multi_timeout_do, s);
|
|
|
|
assert(!s->multi);
|
|
s->multi = curl_multi_init();
|
|
s->aio_context = new_context;
|
|
curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
|
|
curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
|
|
curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
|
|
}
|
|
|
|
static QemuOptsList runtime_opts = {
|
|
.name = "curl",
|
|
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = CURL_BLOCK_OPT_URL,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "URL to open",
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_READAHEAD,
|
|
.type = QEMU_OPT_SIZE,
|
|
.help = "Readahead size",
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_SSLVERIFY,
|
|
.type = QEMU_OPT_BOOL,
|
|
.help = "Verify SSL certificate"
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_TIMEOUT,
|
|
.type = QEMU_OPT_NUMBER,
|
|
.help = "Curl timeout"
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_COOKIE,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Pass the cookie or list of cookies with each request"
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_COOKIE_SECRET,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "ID of secret used as cookie passed with each request"
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_USERNAME,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Username for HTTP auth"
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_PASSWORD_SECRET,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "ID of secret used as password for HTTP auth",
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_PROXY_USERNAME,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "Username for HTTP proxy auth"
|
|
},
|
|
{
|
|
.name = CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
|
|
.type = QEMU_OPT_STRING,
|
|
.help = "ID of secret used as password for HTTP proxy auth",
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|
|
|
|
|
|
static int curl_open(BlockDriverState *bs, QDict *options, int flags,
|
|
Error **errp)
|
|
{
|
|
BDRVCURLState *s = bs->opaque;
|
|
CURLState *state = NULL;
|
|
QemuOpts *opts;
|
|
const char *file;
|
|
const char *cookie;
|
|
const char *cookie_secret;
|
|
double d;
|
|
const char *secretid;
|
|
const char *protocol_delimiter;
|
|
int ret;
|
|
|
|
ret = bdrv_apply_auto_read_only(bs, "curl driver does not support writes",
|
|
errp);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if (!libcurl_initialized) {
|
|
ret = curl_global_init(CURL_GLOBAL_ALL);
|
|
if (ret) {
|
|
error_setg(errp, "libcurl initialization failed with %d", ret);
|
|
return -EIO;
|
|
}
|
|
libcurl_initialized = true;
|
|
}
|
|
|
|
qemu_mutex_init(&s->mutex);
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
|
|
goto out_noclean;
|
|
}
|
|
|
|
s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
|
|
CURL_BLOCK_OPT_READAHEAD_DEFAULT);
|
|
if ((s->readahead_size & 0x1ff) != 0) {
|
|
error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
|
|
s->readahead_size);
|
|
goto out_noclean;
|
|
}
|
|
|
|
s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
|
|
CURL_BLOCK_OPT_TIMEOUT_DEFAULT);
|
|
if (s->timeout > CURL_TIMEOUT_MAX) {
|
|
error_setg(errp, "timeout parameter is too large or negative");
|
|
goto out_noclean;
|
|
}
|
|
|
|
s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY,
|
|
CURL_BLOCK_OPT_SSLVERIFY_DEFAULT);
|
|
|
|
cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE);
|
|
cookie_secret = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE_SECRET);
|
|
|
|
if (cookie && cookie_secret) {
|
|
error_setg(errp,
|
|
"curl driver cannot handle both cookie and cookie secret");
|
|
goto out_noclean;
|
|
}
|
|
|
|
if (cookie_secret) {
|
|
s->cookie = qcrypto_secret_lookup_as_utf8(cookie_secret, errp);
|
|
if (!s->cookie) {
|
|
goto out_noclean;
|
|
}
|
|
} else {
|
|
s->cookie = g_strdup(cookie);
|
|
}
|
|
|
|
file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
|
|
if (file == NULL) {
|
|
error_setg(errp, "curl block driver requires an 'url' option");
|
|
goto out_noclean;
|
|
}
|
|
|
|
if (!strstart(file, bs->drv->protocol_name, &protocol_delimiter) ||
|
|
!strstart(protocol_delimiter, "://", NULL))
|
|
{
|
|
error_setg(errp, "%s curl driver cannot handle the URL '%s' (does not "
|
|
"start with '%s://')", bs->drv->protocol_name, file,
|
|
bs->drv->protocol_name);
|
|
goto out_noclean;
|
|
}
|
|
|
|
s->username = g_strdup(qemu_opt_get(opts, CURL_BLOCK_OPT_USERNAME));
|
|
secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PASSWORD_SECRET);
|
|
|
|
if (secretid) {
|
|
s->password = qcrypto_secret_lookup_as_utf8(secretid, errp);
|
|
if (!s->password) {
|
|
goto out_noclean;
|
|
}
|
|
}
|
|
|
|
s->proxyusername = g_strdup(
|
|
qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_USERNAME));
|
|
secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET);
|
|
if (secretid) {
|
|
s->proxypassword = qcrypto_secret_lookup_as_utf8(secretid, errp);
|
|
if (!s->proxypassword) {
|
|
goto out_noclean;
|
|
}
|
|
}
|
|
|
|
trace_curl_open(file);
|
|
qemu_co_queue_init(&s->free_state_waitq);
|
|
s->aio_context = bdrv_get_aio_context(bs);
|
|
s->url = g_strdup(file);
|
|
s->sockets = g_hash_table_new_full(NULL, NULL, NULL, g_free);
|
|
qemu_mutex_lock(&s->mutex);
|
|
state = curl_find_state(s);
|
|
qemu_mutex_unlock(&s->mutex);
|
|
if (!state) {
|
|
goto out_noclean;
|
|
}
|
|
|
|
// Get file size
|
|
|
|
if (curl_init_state(s, state) < 0) {
|
|
pstrcpy(state->errmsg, CURL_ERROR_SIZE,
|
|
"curl library initialization failed.");
|
|
goto out;
|
|
}
|
|
|
|
s->accept_range = false;
|
|
if (curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1) ||
|
|
curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION, curl_header_cb) ||
|
|
curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s)) {
|
|
pstrcpy(state->errmsg, CURL_ERROR_SIZE,
|
|
"curl library initialization failed.");
|
|
goto out;
|
|
}
|
|
if (curl_easy_perform(state->curl))
|
|
goto out;
|
|
if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d)) {
|
|
goto out;
|
|
}
|
|
/* Prior CURL 7.19.4 return value of 0 could mean that the file size is not
|
|
* know or the size is zero. From 7.19.4 CURL returns -1 if size is not
|
|
* known and zero if it is really zero-length file. */
|
|
#if LIBCURL_VERSION_NUM >= 0x071304
|
|
if (d < 0) {
|
|
pstrcpy(state->errmsg, CURL_ERROR_SIZE,
|
|
"Server didn't report file size.");
|
|
goto out;
|
|
}
|
|
#else
|
|
if (d <= 0) {
|
|
pstrcpy(state->errmsg, CURL_ERROR_SIZE,
|
|
"Unknown file size or zero-length file.");
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
s->len = d;
|
|
|
|
if ((!strncasecmp(s->url, "http://", strlen("http://"))
|
|
|| !strncasecmp(s->url, "https://", strlen("https://")))
|
|
&& !s->accept_range) {
|
|
pstrcpy(state->errmsg, CURL_ERROR_SIZE,
|
|
"Server does not support 'range' (byte ranges).");
|
|
goto out;
|
|
}
|
|
trace_curl_open_size(s->len);
|
|
|
|
qemu_mutex_lock(&s->mutex);
|
|
curl_clean_state(state);
|
|
qemu_mutex_unlock(&s->mutex);
|
|
curl_easy_cleanup(state->curl);
|
|
state->curl = NULL;
|
|
|
|
curl_attach_aio_context(bs, bdrv_get_aio_context(bs));
|
|
|
|
qemu_opts_del(opts);
|
|
return 0;
|
|
|
|
out:
|
|
error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
|
|
curl_easy_cleanup(state->curl);
|
|
state->curl = NULL;
|
|
out_noclean:
|
|
qemu_mutex_destroy(&s->mutex);
|
|
g_free(s->cookie);
|
|
g_free(s->url);
|
|
g_free(s->username);
|
|
g_free(s->proxyusername);
|
|
g_free(s->proxypassword);
|
|
curl_drop_all_sockets(s->sockets);
|
|
g_hash_table_destroy(s->sockets);
|
|
qemu_opts_del(opts);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
|
|
{
|
|
CURLState *state;
|
|
int running;
|
|
|
|
BDRVCURLState *s = bs->opaque;
|
|
|
|
uint64_t start = acb->offset;
|
|
uint64_t end;
|
|
|
|
qemu_mutex_lock(&s->mutex);
|
|
|
|
// In case we have the requested data already (e.g. read-ahead),
|
|
// we can just call the callback and be done.
|
|
if (curl_find_buf(s, start, acb->bytes, acb)) {
|
|
goto out;
|
|
}
|
|
|
|
// No cache found, so let's start a new request
|
|
for (;;) {
|
|
state = curl_find_state(s);
|
|
if (state) {
|
|
break;
|
|
}
|
|
qemu_co_queue_wait(&s->free_state_waitq, &s->mutex);
|
|
}
|
|
|
|
if (curl_init_state(s, state) < 0) {
|
|
curl_clean_state(state);
|
|
acb->ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
acb->start = 0;
|
|
acb->end = MIN(acb->bytes, s->len - start);
|
|
|
|
state->buf_off = 0;
|
|
g_free(state->orig_buf);
|
|
state->buf_start = start;
|
|
state->buf_len = MIN(acb->end + s->readahead_size, s->len - start);
|
|
end = start + state->buf_len - 1;
|
|
state->orig_buf = g_try_malloc(state->buf_len);
|
|
if (state->buf_len && state->orig_buf == NULL) {
|
|
curl_clean_state(state);
|
|
acb->ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
state->acb[0] = acb;
|
|
|
|
snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end);
|
|
trace_curl_setup_preadv(acb->bytes, start, state->range);
|
|
if (curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range) ||
|
|
curl_multi_add_handle(s->multi, state->curl) != CURLM_OK) {
|
|
state->acb[0] = NULL;
|
|
acb->ret = -EIO;
|
|
|
|
curl_clean_state(state);
|
|
goto out;
|
|
}
|
|
|
|
/* Tell curl it needs to kick things off */
|
|
curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
|
|
|
|
out:
|
|
qemu_mutex_unlock(&s->mutex);
|
|
}
|
|
|
|
static int coroutine_fn curl_co_preadv(BlockDriverState *bs,
|
|
int64_t offset, int64_t bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
CURLAIOCB acb = {
|
|
.co = qemu_coroutine_self(),
|
|
.ret = -EINPROGRESS,
|
|
.qiov = qiov,
|
|
.offset = offset,
|
|
.bytes = bytes
|
|
};
|
|
|
|
curl_setup_preadv(bs, &acb);
|
|
while (acb.ret == -EINPROGRESS) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
return acb.ret;
|
|
}
|
|
|
|
static void curl_close(BlockDriverState *bs)
|
|
{
|
|
BDRVCURLState *s = bs->opaque;
|
|
|
|
trace_curl_close();
|
|
curl_detach_aio_context(bs);
|
|
qemu_mutex_destroy(&s->mutex);
|
|
|
|
g_hash_table_destroy(s->sockets);
|
|
g_free(s->cookie);
|
|
g_free(s->url);
|
|
g_free(s->username);
|
|
g_free(s->proxyusername);
|
|
g_free(s->proxypassword);
|
|
}
|
|
|
|
static int64_t curl_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVCURLState *s = bs->opaque;
|
|
return s->len;
|
|
}
|
|
|
|
static void curl_refresh_filename(BlockDriverState *bs)
|
|
{
|
|
BDRVCURLState *s = bs->opaque;
|
|
|
|
/* "readahead" and "timeout" do not change the guest-visible data,
|
|
* so ignore them */
|
|
if (s->sslverify != CURL_BLOCK_OPT_SSLVERIFY_DEFAULT ||
|
|
s->cookie || s->username || s->password || s->proxyusername ||
|
|
s->proxypassword)
|
|
{
|
|
return;
|
|
}
|
|
|
|
pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), s->url);
|
|
}
|
|
|
|
|
|
static const char *const curl_strong_runtime_opts[] = {
|
|
CURL_BLOCK_OPT_URL,
|
|
CURL_BLOCK_OPT_SSLVERIFY,
|
|
CURL_BLOCK_OPT_COOKIE,
|
|
CURL_BLOCK_OPT_COOKIE_SECRET,
|
|
CURL_BLOCK_OPT_USERNAME,
|
|
CURL_BLOCK_OPT_PASSWORD_SECRET,
|
|
CURL_BLOCK_OPT_PROXY_USERNAME,
|
|
CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
|
|
|
|
NULL
|
|
};
|
|
|
|
static BlockDriver bdrv_http = {
|
|
.format_name = "http",
|
|
.protocol_name = "http",
|
|
|
|
.instance_size = sizeof(BDRVCURLState),
|
|
.bdrv_parse_filename = curl_parse_filename,
|
|
.bdrv_file_open = curl_open,
|
|
.bdrv_close = curl_close,
|
|
.bdrv_getlength = curl_getlength,
|
|
|
|
.bdrv_co_preadv = curl_co_preadv,
|
|
|
|
.bdrv_detach_aio_context = curl_detach_aio_context,
|
|
.bdrv_attach_aio_context = curl_attach_aio_context,
|
|
|
|
.bdrv_refresh_filename = curl_refresh_filename,
|
|
.strong_runtime_opts = curl_strong_runtime_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_https = {
|
|
.format_name = "https",
|
|
.protocol_name = "https",
|
|
|
|
.instance_size = sizeof(BDRVCURLState),
|
|
.bdrv_parse_filename = curl_parse_filename,
|
|
.bdrv_file_open = curl_open,
|
|
.bdrv_close = curl_close,
|
|
.bdrv_getlength = curl_getlength,
|
|
|
|
.bdrv_co_preadv = curl_co_preadv,
|
|
|
|
.bdrv_detach_aio_context = curl_detach_aio_context,
|
|
.bdrv_attach_aio_context = curl_attach_aio_context,
|
|
|
|
.bdrv_refresh_filename = curl_refresh_filename,
|
|
.strong_runtime_opts = curl_strong_runtime_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_ftp = {
|
|
.format_name = "ftp",
|
|
.protocol_name = "ftp",
|
|
|
|
.instance_size = sizeof(BDRVCURLState),
|
|
.bdrv_parse_filename = curl_parse_filename,
|
|
.bdrv_file_open = curl_open,
|
|
.bdrv_close = curl_close,
|
|
.bdrv_getlength = curl_getlength,
|
|
|
|
.bdrv_co_preadv = curl_co_preadv,
|
|
|
|
.bdrv_detach_aio_context = curl_detach_aio_context,
|
|
.bdrv_attach_aio_context = curl_attach_aio_context,
|
|
|
|
.bdrv_refresh_filename = curl_refresh_filename,
|
|
.strong_runtime_opts = curl_strong_runtime_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_ftps = {
|
|
.format_name = "ftps",
|
|
.protocol_name = "ftps",
|
|
|
|
.instance_size = sizeof(BDRVCURLState),
|
|
.bdrv_parse_filename = curl_parse_filename,
|
|
.bdrv_file_open = curl_open,
|
|
.bdrv_close = curl_close,
|
|
.bdrv_getlength = curl_getlength,
|
|
|
|
.bdrv_co_preadv = curl_co_preadv,
|
|
|
|
.bdrv_detach_aio_context = curl_detach_aio_context,
|
|
.bdrv_attach_aio_context = curl_attach_aio_context,
|
|
|
|
.bdrv_refresh_filename = curl_refresh_filename,
|
|
.strong_runtime_opts = curl_strong_runtime_opts,
|
|
};
|
|
|
|
static void curl_block_init(void)
|
|
{
|
|
bdrv_register(&bdrv_http);
|
|
bdrv_register(&bdrv_https);
|
|
bdrv_register(&bdrv_ftp);
|
|
bdrv_register(&bdrv_ftps);
|
|
}
|
|
|
|
block_init(curl_block_init);
|