1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * 'pingpong' is for generic back-and-forth support functions used by FTP,
22 * IMAP, POP3, SMTP and whatever more that likes them.
24 ***************************************************************************/
26 #include "curl_setup.h"
32 #include "speedcheck.h"
35 #include "non-ascii.h"
36 #include "vtls/vtls.h"
38 /* The last 3 #include files should be in this order */
39 #include "curl_printf.h"
40 #include "curl_memory.h"
45 /* Returns timeout in ms. 0 or negative number means the timeout has already
47 time_t Curl_pp_state_timeout(struct pingpong *pp)
49 struct connectdata *conn = pp->conn;
50 struct Curl_easy *data = conn->data;
51 time_t timeout_ms; /* in milliseconds */
52 time_t timeout2_ms; /* in milliseconds */
53 long response_time = (data->set.server_response_timeout)?
54 data->set.server_response_timeout: pp->response_time;
56 /* if CURLOPT_SERVER_RESPONSE_TIMEOUT is set, use that to determine
57 remaining time, or use pp->response because SERVER_RESPONSE_TIMEOUT is
58 supposed to govern the response for any given server response, not for
59 the time from connect to the given server response. */
61 /* Without a requested timeout, we only wait 'response_time' seconds for the
62 full response to arrive before we bail out */
63 timeout_ms = response_time -
64 Curl_timediff(Curl_now(), pp->response); /* spent time */
66 if(data->set.timeout) {
67 /* if timeout is requested, find out how much remaining time we have */
68 timeout2_ms = data->set.timeout - /* timeout time */
69 Curl_timediff(Curl_now(), conn->now); /* spent time */
71 /* pick the lowest number */
72 timeout_ms = CURLMIN(timeout_ms, timeout2_ms);
81 CURLcode Curl_pp_statemach(struct pingpong *pp, bool block)
83 struct connectdata *conn = pp->conn;
84 curl_socket_t sock = conn->sock[FIRSTSOCKET];
87 time_t timeout_ms = Curl_pp_state_timeout(pp);
88 struct Curl_easy *data = conn->data;
89 CURLcode result = CURLE_OK;
92 failf(data, "server response timeout");
93 return CURLE_OPERATION_TIMEDOUT; /* already too little time */
97 interval_ms = 1000; /* use 1 second timeout intervals */
98 if(timeout_ms < interval_ms)
99 interval_ms = timeout_ms;
102 interval_ms = 0; /* immediate */
104 if(Curl_ssl_data_pending(conn, FIRSTSOCKET))
106 else if(Curl_pp_moredata(pp))
107 /* We are receiving and there is data in the cache so just read it */
109 else if(!pp->sendleft && Curl_ssl_data_pending(conn, FIRSTSOCKET))
110 /* We are receiving and there is data ready in the SSL library */
113 rc = Curl_socket_check(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
115 pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
119 /* if we didn't wait, we don't have to spend time on this now */
120 if(Curl_pgrsUpdate(conn))
121 result = CURLE_ABORTED_BY_CALLBACK;
123 result = Curl_speedcheck(data, Curl_now());
130 failf(data, "select/poll error");
131 result = CURLE_OUT_OF_MEMORY;
134 result = pp->statemach_act(conn);
139 /* initialize stuff to prepare for reading a fresh new response */
140 void Curl_pp_init(struct pingpong *pp)
142 struct connectdata *conn = pp->conn;
144 pp->linestart_resp = conn->data->state.buffer;
145 pp->pending_resp = TRUE;
146 pp->response = Curl_now(); /* start response time-out now! */
151 /***********************************************************************
155 * Send the formatted string as a command to a pingpong server. Note that
156 * the string should not have any CRLF appended, as this function will
157 * append the necessary things itself.
159 * made to never block
161 CURLcode Curl_pp_vsendf(struct pingpong *pp,
165 ssize_t bytes_written;
170 struct connectdata *conn = pp->conn;
171 struct Curl_easy *data;
174 enum protection_level data_sec;
177 DEBUGASSERT(pp->sendleft == 0);
178 DEBUGASSERT(pp->sendsize == 0);
179 DEBUGASSERT(pp->sendthis == NULL);
182 /* can't send without a connection! */
183 return CURLE_SEND_ERROR;
187 fmt_crlf = aprintf("%s\r\n", fmt); /* append a trailing CRLF */
189 return CURLE_OUT_OF_MEMORY;
191 s = vaprintf(fmt_crlf, args); /* trailing CRLF appended */
194 return CURLE_OUT_OF_MEMORY;
197 write_len = strlen(s);
201 result = Curl_convert_to_network(data, s, write_len);
202 /* Curl_convert_to_network calls failf if unsuccessful */
209 conn->data_prot = PROT_CMD;
211 result = Curl_write(conn, conn->sock[FIRSTSOCKET], s, write_len,
214 data_sec = conn->data_prot;
215 DEBUGASSERT(data_sec > PROT_NONE && data_sec < PROT_LAST);
216 conn->data_prot = data_sec;
224 if(conn->data->set.verbose)
225 Curl_debug(conn->data, CURLINFO_HEADER_OUT,
226 s, (size_t)bytes_written, conn);
228 if(bytes_written != (ssize_t)write_len) {
229 /* the whole chunk was not sent, keep it around and adjust sizes */
231 pp->sendsize = write_len;
232 pp->sendleft = write_len - bytes_written;
237 pp->sendleft = pp->sendsize = 0;
238 pp->response = Curl_now();
245 /***********************************************************************
249 * Send the formatted string as a command to a pingpong server. Note that
250 * the string should not have any CRLF appended, as this function will
251 * append the necessary things itself.
253 * made to never block
255 CURLcode Curl_pp_sendf(struct pingpong *pp,
256 const char *fmt, ...)
262 result = Curl_pp_vsendf(pp, fmt, ap);
272 * Reads a piece of a server response.
274 CURLcode Curl_pp_readresp(curl_socket_t sockfd,
276 int *code, /* return the server code if done */
277 size_t *size) /* size of the response */
279 ssize_t perline; /* count bytes per line */
283 struct connectdata *conn = pp->conn;
284 struct Curl_easy *data = conn->data;
285 char * const buf = data->state.buffer;
286 CURLcode result = CURLE_OK;
288 *code = 0; /* 0 for errors or not done */
291 ptr = buf + pp->nread_resp;
293 /* number of bytes in the current line, so far */
294 perline = (ssize_t)(ptr-pp->linestart_resp);
296 while((pp->nread_resp < (size_t)data->set.buffer_size) &&
297 (keepon && !result)) {
300 /* we had data in the "cache", copy that instead of doing an actual
303 * pp->cache_size is cast to ssize_t here. This should be safe, because
304 * it would have been populated with something of size int to begin
305 * with, even though its datatype may be larger than an int.
307 if((ptr + pp->cache_size) > (buf + data->set.buffer_size + 1)) {
308 failf(data, "cached response data too big to handle");
309 return CURLE_RECV_ERROR;
311 memcpy(ptr, pp->cache, pp->cache_size);
312 gotbytes = (ssize_t)pp->cache_size;
313 free(pp->cache); /* free the cache */
314 pp->cache = NULL; /* clear the pointer */
315 pp->cache_size = 0; /* zero the size just in case */
319 enum protection_level prot = conn->data_prot;
320 conn->data_prot = PROT_CLEAR;
322 DEBUGASSERT((ptr + data->set.buffer_size - pp->nread_resp) <=
323 (buf + data->set.buffer_size + 1));
324 result = Curl_read(conn, sockfd, ptr,
325 data->set.buffer_size - pp->nread_resp,
328 DEBUGASSERT(prot > PROT_NONE && prot < PROT_LAST);
329 conn->data_prot = prot;
331 if(result == CURLE_AGAIN)
332 return CURLE_OK; /* return */
334 if(!result && (gotbytes > 0))
335 /* convert from the network encoding */
336 result = Curl_convert_from_network(data, ptr, gotbytes);
337 /* Curl_convert_from_network calls failf if unsuccessful */
340 /* Set outer result variable to this error. */
346 else if(gotbytes <= 0) {
348 result = CURLE_RECV_ERROR;
349 failf(data, "response reading failed");
352 /* we got a whole chunk of data, which can be anything from one
353 * byte to a set of lines and possible just a piece of the last
356 ssize_t clipamount = 0;
357 bool restart = FALSE;
359 data->req.headerbytecount += (long)gotbytes;
361 pp->nread_resp += gotbytes;
362 for(i = 0; i < gotbytes; ptr++, i++) {
365 /* a newline is CRLF in pp-talk, so the CR is ignored as
366 the line isn't really terminated until the LF comes */
368 /* output debug output if that is requested */
370 if(!conn->sec_complete)
372 if(data->set.verbose)
373 Curl_debug(data, CURLINFO_HEADER_IN,
374 pp->linestart_resp, (size_t)perline, conn);
377 * We pass all response-lines to the callback function registered
378 * for "headers". The response lines can be seen as a kind of
381 result = Curl_client_write(conn, CLIENTWRITE_HEADER,
382 pp->linestart_resp, perline);
386 if(pp->endofresp(conn, pp->linestart_resp, perline, code)) {
387 /* This is the end of the last line, copy the last line to the
388 start of the buffer and zero terminate, for old times sake */
389 size_t n = ptr - pp->linestart_resp;
390 memmove(buf, pp->linestart_resp, n);
391 buf[n] = 0; /* zero terminate */
393 pp->linestart_resp = ptr + 1; /* advance pointer */
394 i++; /* skip this before getting out */
396 *size = pp->nread_resp; /* size of the response */
397 pp->nread_resp = 0; /* restart */
400 perline = 0; /* line starts over here */
401 pp->linestart_resp = ptr + 1;
405 if(!keepon && (i != gotbytes)) {
406 /* We found the end of the response lines, but we didn't parse the
407 full chunk of data we have read from the server. We therefore need
408 to store the rest of the data to be checked on the next invoke as
409 it may actually contain another end of response already! */
410 clipamount = gotbytes - i;
412 DEBUGF(infof(data, "Curl_pp_readresp_ %d bytes of trailing "
413 "server response left\n",
418 if((perline == gotbytes) && (gotbytes > data->set.buffer_size/2)) {
419 /* We got an excessive line without newlines and we need to deal
420 with it. We keep the first bytes of the line then we throw
422 infof(data, "Excessive server response line length received, "
423 "%zd bytes. Stripping\n", gotbytes);
426 /* we keep 40 bytes since all our pingpong protocols are only
427 interested in the first piece */
430 else if(pp->nread_resp > (size_t)data->set.buffer_size/2) {
431 /* We got a large chunk of data and there's potentially still
432 trailing data to take care of, so we put any such part in the
433 "cache", clear the buffer to make space and restart. */
434 clipamount = perline;
438 else if(i == gotbytes)
442 pp->cache_size = clipamount;
443 pp->cache = malloc(pp->cache_size);
445 memcpy(pp->cache, pp->linestart_resp, pp->cache_size);
447 return CURLE_OUT_OF_MEMORY;
450 /* now reset a few variables to start over nicely from the start of
452 pp->nread_resp = 0; /* start over from scratch in the buffer */
453 ptr = pp->linestart_resp = buf;
457 } /* there was data */
459 } /* while there's buffer left and loop is requested */
461 pp->pending_resp = FALSE;
466 int Curl_pp_getsock(struct pingpong *pp,
467 curl_socket_t *socks,
470 struct connectdata *conn = pp->conn;
473 return GETSOCK_BLANK;
475 socks[0] = conn->sock[FIRSTSOCKET];
479 return GETSOCK_WRITESOCK(0);
483 return GETSOCK_READSOCK(0);
486 CURLcode Curl_pp_flushsend(struct pingpong *pp)
488 /* we have a piece of a command still left to send */
489 struct connectdata *conn = pp->conn;
491 curl_socket_t sock = conn->sock[FIRSTSOCKET];
492 CURLcode result = Curl_write(conn, sock, pp->sendthis + pp->sendsize -
493 pp->sendleft, pp->sendleft, &written);
497 if(written != (ssize_t)pp->sendleft) {
498 /* only a fraction was sent */
499 pp->sendleft -= written;
504 pp->sendleft = pp->sendsize = 0;
505 pp->response = Curl_now();
510 CURLcode Curl_pp_disconnect(struct pingpong *pp)
517 bool Curl_pp_moredata(struct pingpong *pp)
519 return (!pp->sendleft && pp->cache && pp->nread_resp < pp->cache_size) ?