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/*
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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-common.h" |
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#include "block/block_int.h" |
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#include <curl/curl.h> |
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// #define DEBUG
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// #define DEBUG_VERBOSE
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#ifdef DEBUG_CURL
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#define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) do { } while (0) |
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#endif
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|
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#define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
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CURLPROTO_FTP | CURLPROTO_FTPS | \ |
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CURLPROTO_TFTP) |
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|
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#define CURL_NUM_STATES 8 |
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#define CURL_NUM_ACB 8 |
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#define SECTOR_SIZE 512 |
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#define READ_AHEAD_SIZE (256 * 1024) |
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|
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#define FIND_RET_NONE 0 |
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#define FIND_RET_OK 1 |
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#define FIND_RET_WAIT 2 |
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|
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struct BDRVCURLState;
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|
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typedef struct CURLAIOCB { |
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BlockDriverAIOCB common; |
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QEMUBH *bh; |
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QEMUIOVector *qiov; |
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|
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int64_t sector_num; |
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int nb_sectors;
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|
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size_t start; |
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size_t end; |
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} CURLAIOCB; |
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|
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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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size_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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|
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typedef struct BDRVCURLState { |
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CURLM *multi; |
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size_t len; |
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CURLState states[CURL_NUM_STATES]; |
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char *url;
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size_t readahead_size; |
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} BDRVCURLState; |
85 |
|
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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 int curl_aio_flush(void *opaque); |
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|
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static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action, |
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void *s, void *sp) |
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{ |
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DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
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switch (action) {
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case CURL_POLL_IN:
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qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, curl_aio_flush, s);
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break;
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case CURL_POLL_OUT:
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qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, curl_aio_flush, s);
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break;
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case CURL_POLL_INOUT:
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qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do, |
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curl_aio_flush, s); |
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break;
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case CURL_POLL_REMOVE:
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qemu_aio_set_fd_handler(fd, NULL, NULL, NULL, NULL); |
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break;
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} |
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return 0; |
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} |
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|
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static size_t curl_size_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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size_t fsize; |
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|
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if(sscanf(ptr, "Content-Length: %zd", &fsize) == 1) { |
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s->s->len = fsize; |
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} |
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return realsize;
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} |
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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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int i;
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|
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DPRINTF("CURL: Just reading %zd bytes\n", realsize);
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|
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if (!s || !s->orig_buf)
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goto read_end;
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memcpy(s->orig_buf + s->buf_off, ptr, realsize); |
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s->buf_off += realsize; |
139 |
|
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for(i=0; i<CURL_NUM_ACB; i++) { |
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CURLAIOCB *acb = s->acb[i]; |
142 |
|
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if (!acb)
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continue;
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|
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if ((s->buf_off >= acb->end)) {
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qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
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acb->end - acb->start); |
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acb->common.cb(acb->common.opaque, 0);
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qemu_aio_release(acb); |
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s->acb[i] = NULL;
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} |
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} |
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read_end:
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return realsize;
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} |
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static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len, |
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CURLAIOCB *acb) |
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{ |
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int i;
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size_t end = start + len; |
164 |
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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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size_t buf_end = (state->buf_start + state->buf_off); |
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size_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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|
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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) && |
178 |
(end >= state->buf_start) && |
179 |
(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, len);
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acb->common.cb(acb->common.opaque, 0);
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return FIND_RET_OK;
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} |
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// Wait for unfinished chunks
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if ((start >= state->buf_start) &&
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(start <= buf_fend) && |
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(end >= state->buf_start) && |
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(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 + len; |
199 |
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for (j=0; j<CURL_NUM_ACB; j++) { |
201 |
if (!state->acb[j]) {
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state->acb[j] = acb; |
203 |
return FIND_RET_WAIT;
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} |
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} |
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} |
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} |
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return FIND_RET_NONE;
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} |
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static void curl_multi_do(void *arg) |
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{ |
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BDRVCURLState *s = (BDRVCURLState *)arg; |
215 |
int running;
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int r;
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int msgs_in_queue;
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if (!s->multi)
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return;
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do {
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r = curl_multi_socket_all(s->multi, &running); |
224 |
} while(r == CURLM_CALL_MULTI_PERFORM);
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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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do {
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CURLMsg *msg; |
230 |
msg = curl_multi_info_read(s->multi, &msgs_in_queue); |
231 |
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if (!msg)
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break;
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if (msg->msg == CURLMSG_NONE)
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break;
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switch (msg->msg) {
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case CURLMSG_DONE:
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{ |
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CURLState *state = NULL;
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curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, (char**)&state);
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/* ACBs for successful messages get completed in curl_read_cb */
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if (msg->data.result != CURLE_OK) {
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int i;
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for (i = 0; i < CURL_NUM_ACB; i++) { |
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CURLAIOCB *acb = state->acb[i]; |
248 |
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if (acb == NULL) { |
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continue;
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} |
252 |
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acb->common.cb(acb->common.opaque, -EIO); |
254 |
qemu_aio_release(acb); |
255 |
state->acb[i] = NULL;
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} |
257 |
} |
258 |
|
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curl_clean_state(state); |
260 |
break;
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} |
262 |
default:
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msgs_in_queue = 0;
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break;
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} |
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} while(msgs_in_queue);
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} |
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static CURLState *curl_init_state(BDRVCURLState *s)
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{ |
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CURLState *state = NULL;
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int i, j;
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|
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do {
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for (i=0; i<CURL_NUM_STATES; i++) { |
276 |
for (j=0; j<CURL_NUM_ACB; j++) |
277 |
if (s->states[i].acb[j])
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continue;
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if (s->states[i].in_use)
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continue;
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state = &s->states[i]; |
283 |
state->in_use = 1;
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break;
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} |
286 |
if (!state) {
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g_usleep(100);
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curl_multi_do(s); |
289 |
} |
290 |
} while(!state);
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291 |
|
292 |
if (state->curl)
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goto has_curl;
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294 |
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state->curl = curl_easy_init(); |
296 |
if (!state->curl)
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return NULL; |
298 |
curl_easy_setopt(state->curl, CURLOPT_URL, s->url); |
299 |
curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
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curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb);
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301 |
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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304 |
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); |
307 |
curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
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308 |
|
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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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312 |
*
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* Restricting protocols is only supported from 7.19.4 upwards.
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*/
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315 |
#if LIBCURL_VERSION_NUM >= 0x071304 |
316 |
curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS); |
317 |
curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS); |
318 |
#endif
|
319 |
|
320 |
#ifdef DEBUG_VERBOSE
|
321 |
curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
|
322 |
#endif
|
323 |
|
324 |
has_curl:
|
325 |
|
326 |
state->s = s; |
327 |
|
328 |
return state;
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329 |
} |
330 |
|
331 |
static void curl_clean_state(CURLState *s) |
332 |
{ |
333 |
if (s->s->multi)
|
334 |
curl_multi_remove_handle(s->s->multi, s->curl); |
335 |
s->in_use = 0;
|
336 |
} |
337 |
|
338 |
static int curl_open(BlockDriverState *bs, const char *filename, |
339 |
QDict *options, int flags)
|
340 |
{ |
341 |
BDRVCURLState *s = bs->opaque; |
342 |
CURLState *state = NULL;
|
343 |
double d;
|
344 |
|
345 |
#define RA_OPTSTR ":readahead=" |
346 |
char *file;
|
347 |
char *ra;
|
348 |
const char *ra_val; |
349 |
int parse_state = 0; |
350 |
|
351 |
static int inited = 0; |
352 |
|
353 |
file = g_strdup(filename); |
354 |
s->readahead_size = READ_AHEAD_SIZE; |
355 |
|
356 |
/* Parse a trailing ":readahead=#:" param, if present. */
|
357 |
ra = file + strlen(file) - 1;
|
358 |
while (ra >= file) {
|
359 |
if (parse_state == 0) { |
360 |
if (*ra == ':') |
361 |
parse_state++; |
362 |
else
|
363 |
break;
|
364 |
} else if (parse_state == 1) { |
365 |
if (*ra > '9' || *ra < '0') { |
366 |
char *opt_start = ra - strlen(RA_OPTSTR) + 1; |
367 |
if (opt_start > file &&
|
368 |
strncmp(opt_start, RA_OPTSTR, strlen(RA_OPTSTR)) == 0) {
|
369 |
ra_val = ra + 1;
|
370 |
ra -= strlen(RA_OPTSTR) - 1;
|
371 |
*ra = '\0';
|
372 |
s->readahead_size = atoi(ra_val); |
373 |
break;
|
374 |
} else {
|
375 |
break;
|
376 |
} |
377 |
} |
378 |
} |
379 |
ra--; |
380 |
} |
381 |
|
382 |
if ((s->readahead_size & 0x1ff) != 0) { |
383 |
fprintf(stderr, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512\n",
|
384 |
s->readahead_size); |
385 |
goto out_noclean;
|
386 |
} |
387 |
|
388 |
if (!inited) {
|
389 |
curl_global_init(CURL_GLOBAL_ALL); |
390 |
inited = 1;
|
391 |
} |
392 |
|
393 |
DPRINTF("CURL: Opening %s\n", file);
|
394 |
s->url = file; |
395 |
state = curl_init_state(s); |
396 |
if (!state)
|
397 |
goto out_noclean;
|
398 |
|
399 |
// Get file size
|
400 |
|
401 |
curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
|
402 |
curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_size_cb);
|
403 |
if (curl_easy_perform(state->curl))
|
404 |
goto out;
|
405 |
curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d); |
406 |
curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb);
|
407 |
curl_easy_setopt(state->curl, CURLOPT_NOBODY, 0);
|
408 |
if (d)
|
409 |
s->len = (size_t)d; |
410 |
else if(!s->len) |
411 |
goto out;
|
412 |
DPRINTF("CURL: Size = %zd\n", s->len);
|
413 |
|
414 |
curl_clean_state(state); |
415 |
curl_easy_cleanup(state->curl); |
416 |
state->curl = NULL;
|
417 |
|
418 |
// Now we know the file exists and its size, so let's
|
419 |
// initialize the multi interface!
|
420 |
|
421 |
s->multi = curl_multi_init(); |
422 |
curl_multi_setopt( s->multi, CURLMOPT_SOCKETDATA, s); |
423 |
curl_multi_setopt( s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb ); |
424 |
curl_multi_do(s); |
425 |
|
426 |
return 0; |
427 |
|
428 |
out:
|
429 |
fprintf(stderr, "CURL: Error opening file: %s\n", state->errmsg);
|
430 |
curl_easy_cleanup(state->curl); |
431 |
state->curl = NULL;
|
432 |
out_noclean:
|
433 |
g_free(file); |
434 |
return -EINVAL;
|
435 |
} |
436 |
|
437 |
static int curl_aio_flush(void *opaque) |
438 |
{ |
439 |
BDRVCURLState *s = opaque; |
440 |
int i, j;
|
441 |
|
442 |
for (i=0; i < CURL_NUM_STATES; i++) { |
443 |
for(j=0; j < CURL_NUM_ACB; j++) { |
444 |
if (s->states[i].acb[j]) {
|
445 |
return 1; |
446 |
} |
447 |
} |
448 |
} |
449 |
return 0; |
450 |
} |
451 |
|
452 |
static void curl_aio_cancel(BlockDriverAIOCB *blockacb) |
453 |
{ |
454 |
// Do we have to implement canceling? Seems to work without...
|
455 |
} |
456 |
|
457 |
static const AIOCBInfo curl_aiocb_info = { |
458 |
.aiocb_size = sizeof(CURLAIOCB),
|
459 |
.cancel = curl_aio_cancel, |
460 |
}; |
461 |
|
462 |
|
463 |
static void curl_readv_bh_cb(void *p) |
464 |
{ |
465 |
CURLState *state; |
466 |
|
467 |
CURLAIOCB *acb = p; |
468 |
BDRVCURLState *s = acb->common.bs->opaque; |
469 |
|
470 |
qemu_bh_delete(acb->bh); |
471 |
acb->bh = NULL;
|
472 |
|
473 |
size_t start = acb->sector_num * SECTOR_SIZE; |
474 |
size_t end; |
475 |
|
476 |
// In case we have the requested data already (e.g. read-ahead),
|
477 |
// we can just call the callback and be done.
|
478 |
switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
|
479 |
case FIND_RET_OK:
|
480 |
qemu_aio_release(acb); |
481 |
// fall through
|
482 |
case FIND_RET_WAIT:
|
483 |
return;
|
484 |
default:
|
485 |
break;
|
486 |
} |
487 |
|
488 |
// No cache found, so let's start a new request
|
489 |
state = curl_init_state(s); |
490 |
if (!state) {
|
491 |
acb->common.cb(acb->common.opaque, -EIO); |
492 |
qemu_aio_release(acb); |
493 |
return;
|
494 |
} |
495 |
|
496 |
acb->start = 0;
|
497 |
acb->end = (acb->nb_sectors * SECTOR_SIZE); |
498 |
|
499 |
state->buf_off = 0;
|
500 |
if (state->orig_buf)
|
501 |
g_free(state->orig_buf); |
502 |
state->buf_start = start; |
503 |
state->buf_len = acb->end + s->readahead_size; |
504 |
end = MIN(start + state->buf_len, s->len) - 1;
|
505 |
state->orig_buf = g_malloc(state->buf_len); |
506 |
state->acb[0] = acb;
|
507 |
|
508 |
snprintf(state->range, 127, "%zd-%zd", start, end); |
509 |
DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
|
510 |
(acb->nb_sectors * SECTOR_SIZE), start, state->range); |
511 |
curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range); |
512 |
|
513 |
curl_multi_add_handle(s->multi, state->curl); |
514 |
curl_multi_do(s); |
515 |
|
516 |
} |
517 |
|
518 |
static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
|
519 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
520 |
BlockDriverCompletionFunc *cb, void *opaque)
|
521 |
{ |
522 |
CURLAIOCB *acb; |
523 |
|
524 |
acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque); |
525 |
|
526 |
acb->qiov = qiov; |
527 |
acb->sector_num = sector_num; |
528 |
acb->nb_sectors = nb_sectors; |
529 |
|
530 |
acb->bh = qemu_bh_new(curl_readv_bh_cb, acb); |
531 |
|
532 |
if (!acb->bh) {
|
533 |
DPRINTF("CURL: qemu_bh_new failed\n");
|
534 |
return NULL; |
535 |
} |
536 |
|
537 |
qemu_bh_schedule(acb->bh); |
538 |
return &acb->common;
|
539 |
} |
540 |
|
541 |
static void curl_close(BlockDriverState *bs) |
542 |
{ |
543 |
BDRVCURLState *s = bs->opaque; |
544 |
int i;
|
545 |
|
546 |
DPRINTF("CURL: Close\n");
|
547 |
for (i=0; i<CURL_NUM_STATES; i++) { |
548 |
if (s->states[i].in_use)
|
549 |
curl_clean_state(&s->states[i]); |
550 |
if (s->states[i].curl) {
|
551 |
curl_easy_cleanup(s->states[i].curl); |
552 |
s->states[i].curl = NULL;
|
553 |
} |
554 |
if (s->states[i].orig_buf) {
|
555 |
g_free(s->states[i].orig_buf); |
556 |
s->states[i].orig_buf = NULL;
|
557 |
} |
558 |
} |
559 |
if (s->multi)
|
560 |
curl_multi_cleanup(s->multi); |
561 |
g_free(s->url); |
562 |
} |
563 |
|
564 |
static int64_t curl_getlength(BlockDriverState *bs)
|
565 |
{ |
566 |
BDRVCURLState *s = bs->opaque; |
567 |
return s->len;
|
568 |
} |
569 |
|
570 |
static BlockDriver bdrv_http = {
|
571 |
.format_name = "http",
|
572 |
.protocol_name = "http",
|
573 |
|
574 |
.instance_size = sizeof(BDRVCURLState),
|
575 |
.bdrv_file_open = curl_open, |
576 |
.bdrv_close = curl_close, |
577 |
.bdrv_getlength = curl_getlength, |
578 |
|
579 |
.bdrv_aio_readv = curl_aio_readv, |
580 |
}; |
581 |
|
582 |
static BlockDriver bdrv_https = {
|
583 |
.format_name = "https",
|
584 |
.protocol_name = "https",
|
585 |
|
586 |
.instance_size = sizeof(BDRVCURLState),
|
587 |
.bdrv_file_open = curl_open, |
588 |
.bdrv_close = curl_close, |
589 |
.bdrv_getlength = curl_getlength, |
590 |
|
591 |
.bdrv_aio_readv = curl_aio_readv, |
592 |
}; |
593 |
|
594 |
static BlockDriver bdrv_ftp = {
|
595 |
.format_name = "ftp",
|
596 |
.protocol_name = "ftp",
|
597 |
|
598 |
.instance_size = sizeof(BDRVCURLState),
|
599 |
.bdrv_file_open = curl_open, |
600 |
.bdrv_close = curl_close, |
601 |
.bdrv_getlength = curl_getlength, |
602 |
|
603 |
.bdrv_aio_readv = curl_aio_readv, |
604 |
}; |
605 |
|
606 |
static BlockDriver bdrv_ftps = {
|
607 |
.format_name = "ftps",
|
608 |
.protocol_name = "ftps",
|
609 |
|
610 |
.instance_size = sizeof(BDRVCURLState),
|
611 |
.bdrv_file_open = curl_open, |
612 |
.bdrv_close = curl_close, |
613 |
.bdrv_getlength = curl_getlength, |
614 |
|
615 |
.bdrv_aio_readv = curl_aio_readv, |
616 |
}; |
617 |
|
618 |
static BlockDriver bdrv_tftp = {
|
619 |
.format_name = "tftp",
|
620 |
.protocol_name = "tftp",
|
621 |
|
622 |
.instance_size = sizeof(BDRVCURLState),
|
623 |
.bdrv_file_open = curl_open, |
624 |
.bdrv_close = curl_close, |
625 |
.bdrv_getlength = curl_getlength, |
626 |
|
627 |
.bdrv_aio_readv = curl_aio_readv, |
628 |
}; |
629 |
|
630 |
static void curl_block_init(void) |
631 |
{ |
632 |
bdrv_register(&bdrv_http); |
633 |
bdrv_register(&bdrv_https); |
634 |
bdrv_register(&bdrv_ftp); |
635 |
bdrv_register(&bdrv_ftps); |
636 |
bdrv_register(&bdrv_tftp); |
637 |
} |
638 |
|
639 |
block_init(curl_block_init); |