1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2022, 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.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 * SPDX-License-Identifier: curl
23 * 'pingpong' is for generic back-and-forth support functions used by FTP,
24 * IMAP, POP3, SMTP and whatever more that likes them.
26 ***************************************************************************/
28 #include "curl_setup.h"
34 #include "speedcheck.h"
37 #include "vtls/vtls.h"
39 /* The last 3 #include files should be in this order */
40 #include "curl_printf.h"
41 #include "curl_memory.h"
46 /* Returns timeout in ms. 0 or negative number means the timeout has already
48 timediff_t Curl_pp_state_timeout(struct Curl_easy *data,
49 struct pingpong *pp, bool disconnecting)
51 struct connectdata *conn = data->conn;
52 timediff_t timeout_ms; /* in milliseconds */
53 timediff_t 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 && !disconnecting) {
67 /* if timeout is requested, find out how much remaining time we have */
68 timediff_t 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 Curl_easy *data,
82 struct pingpong *pp, bool block,
85 struct connectdata *conn = data->conn;
86 curl_socket_t sock = conn->sock[FIRSTSOCKET];
88 timediff_t interval_ms;
89 timediff_t timeout_ms = Curl_pp_state_timeout(data, pp, disconnecting);
90 CURLcode result = CURLE_OK;
93 failf(data, "server response timeout");
94 return CURLE_OPERATION_TIMEDOUT; /* already too little time */
98 interval_ms = 1000; /* use 1 second timeout intervals */
99 if(timeout_ms < interval_ms)
100 interval_ms = timeout_ms;
103 interval_ms = 0; /* immediate */
105 if(Curl_ssl_data_pending(conn, FIRSTSOCKET))
107 else if(Curl_pp_moredata(pp))
108 /* We are receiving and there is data in the cache so just read it */
110 else if(!pp->sendleft && Curl_ssl_data_pending(conn, FIRSTSOCKET))
111 /* We are receiving and there is data ready in the SSL library */
114 rc = Curl_socket_check(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
116 pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
120 /* if we didn't wait, we don't have to spend time on this now */
121 if(Curl_pgrsUpdate(data))
122 result = CURLE_ABORTED_BY_CALLBACK;
124 result = Curl_speedcheck(data, Curl_now());
131 failf(data, "select/poll error");
132 result = CURLE_OUT_OF_MEMORY;
135 result = pp->statemachine(data, data->conn);
140 /* initialize stuff to prepare for reading a fresh new response */
141 void Curl_pp_init(struct Curl_easy *data, struct pingpong *pp)
145 pp->linestart_resp = data->state.buffer;
146 pp->pending_resp = TRUE;
147 pp->response = Curl_now(); /* start response time-out now! */
150 /* setup for the coming transfer */
151 void Curl_pp_setup(struct pingpong *pp)
153 Curl_dyn_init(&pp->sendbuf, DYN_PINGPPONG_CMD);
156 /***********************************************************************
160 * Send the formatted string as a command to a pingpong server. Note that
161 * the string should not have any CRLF appended, as this function will
162 * append the necessary things itself.
164 * made to never block
166 CURLcode Curl_pp_vsendf(struct Curl_easy *data,
171 ssize_t bytes_written = 0;
175 struct connectdata *conn = data->conn;
178 enum protection_level data_sec;
181 DEBUGASSERT(pp->sendleft == 0);
182 DEBUGASSERT(pp->sendsize == 0);
183 DEBUGASSERT(pp->sendthis == NULL);
186 /* can't send without a connection! */
187 return CURLE_SEND_ERROR;
189 Curl_dyn_reset(&pp->sendbuf);
190 result = Curl_dyn_vaddf(&pp->sendbuf, fmt, args);
195 result = Curl_dyn_addn(&pp->sendbuf, "\r\n", 2);
199 write_len = Curl_dyn_len(&pp->sendbuf);
200 s = Curl_dyn_ptr(&pp->sendbuf);
201 Curl_pp_init(data, pp);
204 conn->data_prot = PROT_CMD;
206 result = Curl_write(data, conn->sock[FIRSTSOCKET], s, write_len,
211 data_sec = conn->data_prot;
212 DEBUGASSERT(data_sec > PROT_NONE && data_sec < PROT_LAST);
213 conn->data_prot = data_sec;
216 Curl_debug(data, CURLINFO_HEADER_OUT, s, (size_t)bytes_written);
218 if(bytes_written != (ssize_t)write_len) {
219 /* the whole chunk was not sent, keep it around and adjust sizes */
221 pp->sendsize = write_len;
222 pp->sendleft = write_len - bytes_written;
226 pp->sendleft = pp->sendsize = 0;
227 pp->response = Curl_now();
234 /***********************************************************************
238 * Send the formatted string as a command to a pingpong server. Note that
239 * the string should not have any CRLF appended, as this function will
240 * append the necessary things itself.
242 * made to never block
244 CURLcode Curl_pp_sendf(struct Curl_easy *data, struct pingpong *pp,
245 const char *fmt, ...)
251 result = Curl_pp_vsendf(data, pp, fmt, ap);
261 * Reads a piece of a server response.
263 CURLcode Curl_pp_readresp(struct Curl_easy *data,
264 curl_socket_t sockfd,
266 int *code, /* return the server code if done */
267 size_t *size) /* size of the response */
269 ssize_t perline; /* count bytes per line */
273 struct connectdata *conn = data->conn;
274 char * const buf = data->state.buffer;
275 CURLcode result = CURLE_OK;
277 *code = 0; /* 0 for errors or not done */
280 ptr = buf + pp->nread_resp;
282 /* number of bytes in the current line, so far */
283 perline = (ssize_t)(ptr-pp->linestart_resp);
285 while((pp->nread_resp < (size_t)data->set.buffer_size) &&
286 (keepon && !result)) {
289 /* we had data in the "cache", copy that instead of doing an actual
292 * pp->cache_size is cast to ssize_t here. This should be safe, because
293 * it would have been populated with something of size int to begin
294 * with, even though its datatype may be larger than an int.
296 if((ptr + pp->cache_size) > (buf + data->set.buffer_size + 1)) {
297 failf(data, "cached response data too big to handle");
298 return CURLE_WEIRD_SERVER_REPLY;
300 memcpy(ptr, pp->cache, pp->cache_size);
301 gotbytes = (ssize_t)pp->cache_size;
302 free(pp->cache); /* free the cache */
303 pp->cache = NULL; /* clear the pointer */
304 pp->cache_size = 0; /* zero the size just in case */
308 enum protection_level prot = conn->data_prot;
309 conn->data_prot = PROT_CLEAR;
311 DEBUGASSERT((ptr + data->set.buffer_size - pp->nread_resp) <=
312 (buf + data->set.buffer_size + 1));
313 result = Curl_read(data, sockfd, ptr,
314 data->set.buffer_size - pp->nread_resp,
317 DEBUGASSERT(prot > PROT_NONE && prot < PROT_LAST);
318 conn->data_prot = prot;
320 if(result == CURLE_AGAIN)
321 return CURLE_OK; /* return */
324 /* Set outer result variable to this error. */
330 else if(gotbytes <= 0) {
332 result = CURLE_RECV_ERROR;
333 failf(data, "response reading failed (errno: %d)", SOCKERRNO);
336 /* we got a whole chunk of data, which can be anything from one
337 * byte to a set of lines and possible just a piece of the last
340 ssize_t clipamount = 0;
341 bool restart = FALSE;
343 data->req.headerbytecount += (long)gotbytes;
345 pp->nread_resp += gotbytes;
346 for(i = 0; i < gotbytes; ptr++, i++) {
349 /* a newline is CRLF in pp-talk, so the CR is ignored as
350 the line isn't really terminated until the LF comes */
352 /* output debug output if that is requested */
354 if(!conn->sec_complete)
356 Curl_debug(data, CURLINFO_HEADER_IN,
357 pp->linestart_resp, (size_t)perline);
360 * We pass all response-lines to the callback function registered
361 * for "headers". The response lines can be seen as a kind of
364 result = Curl_client_write(data, CLIENTWRITE_HEADER,
365 pp->linestart_resp, perline);
369 if(pp->endofresp(data, conn, pp->linestart_resp, perline, code)) {
370 /* This is the end of the last line, copy the last line to the
371 start of the buffer and null-terminate, for old times sake */
372 size_t n = ptr - pp->linestart_resp;
373 memmove(buf, pp->linestart_resp, n);
374 buf[n] = 0; /* null-terminate */
376 pp->linestart_resp = ptr + 1; /* advance pointer */
377 i++; /* skip this before getting out */
379 *size = pp->nread_resp; /* size of the response */
380 pp->nread_resp = 0; /* restart */
383 perline = 0; /* line starts over here */
384 pp->linestart_resp = ptr + 1;
388 if(!keepon && (i != gotbytes)) {
389 /* We found the end of the response lines, but we didn't parse the
390 full chunk of data we have read from the server. We therefore need
391 to store the rest of the data to be checked on the next invoke as
392 it may actually contain another end of response already! */
393 clipamount = gotbytes - i;
395 DEBUGF(infof(data, "Curl_pp_readresp_ %d bytes of trailing "
396 "server response left",
401 if((perline == gotbytes) &&
402 (gotbytes > (ssize_t)data->set.buffer_size/2)) {
403 /* We got an excessive line without newlines and we need to deal
404 with it. We keep the first bytes of the line then we throw
406 infof(data, "Excessive server response line length received, "
407 "%zd bytes. Stripping", gotbytes);
410 /* we keep 40 bytes since all our pingpong protocols are only
411 interested in the first piece */
414 else if(pp->nread_resp > (size_t)data->set.buffer_size/2) {
415 /* We got a large chunk of data and there's potentially still
416 trailing data to take care of, so we put any such part in the
417 "cache", clear the buffer to make space and restart. */
418 clipamount = perline;
422 else if(i == gotbytes)
426 pp->cache_size = clipamount;
427 pp->cache = malloc(pp->cache_size);
429 memcpy(pp->cache, pp->linestart_resp, pp->cache_size);
431 return CURLE_OUT_OF_MEMORY;
434 /* now reset a few variables to start over nicely from the start of
436 pp->nread_resp = 0; /* start over from scratch in the buffer */
437 ptr = pp->linestart_resp = buf;
441 } /* there was data */
443 } /* while there's buffer left and loop is requested */
445 pp->pending_resp = FALSE;
450 int Curl_pp_getsock(struct Curl_easy *data,
451 struct pingpong *pp, curl_socket_t *socks)
453 struct connectdata *conn = data->conn;
454 socks[0] = conn->sock[FIRSTSOCKET];
458 return GETSOCK_WRITESOCK(0);
462 return GETSOCK_READSOCK(0);
465 CURLcode Curl_pp_flushsend(struct Curl_easy *data,
468 /* we have a piece of a command still left to send */
469 struct connectdata *conn = data->conn;
471 curl_socket_t sock = conn->sock[FIRSTSOCKET];
472 CURLcode result = Curl_write(data, sock, pp->sendthis + pp->sendsize -
473 pp->sendleft, pp->sendleft, &written);
477 if(written != (ssize_t)pp->sendleft) {
478 /* only a fraction was sent */
479 pp->sendleft -= written;
483 pp->sendleft = pp->sendsize = 0;
484 pp->response = Curl_now();
489 CURLcode Curl_pp_disconnect(struct pingpong *pp)
491 Curl_dyn_free(&pp->sendbuf);
492 Curl_safefree(pp->cache);
496 bool Curl_pp_moredata(struct pingpong *pp)
498 return (!pp->sendleft && pp->cache && pp->nread_resp < pp->cache_size) ?