1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2016, 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_tvdiff(Curl_tvnow(), 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_tvdiff(Curl_tvnow(), 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_tvnow());
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_tvnow(); /* start response time-out now! */
151 /***********************************************************************
155 * Send the formated 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 = conn->data;
174 enum protection_level data_sec = conn->data_prot;
177 DEBUGASSERT(pp->sendleft == 0);
178 DEBUGASSERT(pp->sendsize == 0);
179 DEBUGASSERT(pp->sendthis == NULL);
181 fmt_crlf = aprintf("%s\r\n", fmt); /* append a trailing CRLF */
183 return CURLE_OUT_OF_MEMORY;
185 s = vaprintf(fmt_crlf, args); /* trailing CRLF appended */
188 return CURLE_OUT_OF_MEMORY;
191 write_len = strlen(s);
195 result = Curl_convert_to_network(data, s, write_len);
196 /* Curl_convert_to_network calls failf if unsuccessful */
203 conn->data_prot = PROT_CMD;
205 result = Curl_write(conn, conn->sock[FIRSTSOCKET], s, write_len,
208 DEBUGASSERT(data_sec > PROT_NONE && data_sec < PROT_LAST);
209 conn->data_prot = data_sec;
217 if(conn->data->set.verbose)
218 Curl_debug(conn->data, CURLINFO_HEADER_OUT,
219 s, (size_t)bytes_written, conn);
221 if(bytes_written != (ssize_t)write_len) {
222 /* the whole chunk was not sent, keep it around and adjust sizes */
224 pp->sendsize = write_len;
225 pp->sendleft = write_len - bytes_written;
230 pp->sendleft = pp->sendsize = 0;
231 pp->response = Curl_tvnow();
238 /***********************************************************************
242 * Send the formated string as a command to a pingpong server. Note that
243 * the string should not have any CRLF appended, as this function will
244 * append the necessary things itself.
246 * made to never block
248 CURLcode Curl_pp_sendf(struct pingpong *pp,
249 const char *fmt, ...)
255 result = Curl_pp_vsendf(pp, fmt, ap);
265 * Reads a piece of a server response.
267 CURLcode Curl_pp_readresp(curl_socket_t sockfd,
269 int *code, /* return the server code if done */
270 size_t *size) /* size of the response */
272 ssize_t perline; /* count bytes per line */
276 struct connectdata *conn = pp->conn;
277 struct Curl_easy *data = conn->data;
278 char * const buf = data->state.buffer;
279 CURLcode result = CURLE_OK;
281 *code = 0; /* 0 for errors or not done */
284 ptr=buf + pp->nread_resp;
286 /* number of bytes in the current line, so far */
287 perline = (ssize_t)(ptr-pp->linestart_resp);
289 while((pp->nread_resp<BUFSIZE) && (keepon && !result)) {
292 /* we had data in the "cache", copy that instead of doing an actual
295 * pp->cache_size is cast to ssize_t here. This should be safe, because
296 * it would have been populated with something of size int to begin
297 * with, even though its datatype may be larger than an int.
299 DEBUGASSERT((ptr+pp->cache_size) <= (buf+BUFSIZE+1));
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+BUFSIZE-pp->nread_resp) <= (buf+BUFSIZE+1));
312 result = Curl_read(conn, sockfd, ptr, BUFSIZE-pp->nread_resp,
315 DEBUGASSERT(prot > PROT_NONE && prot < PROT_LAST);
316 conn->data_prot = prot;
318 if(result == CURLE_AGAIN)
319 return CURLE_OK; /* return */
321 if(!result && (gotbytes > 0))
322 /* convert from the network encoding */
323 result = Curl_convert_from_network(data, ptr, gotbytes);
324 /* Curl_convert_from_network calls failf if unsuccessful */
327 /* Set outer result variable to this error. */
333 else if(gotbytes <= 0) {
335 result = CURLE_RECV_ERROR;
336 failf(data, "response reading failed");
339 /* we got a whole chunk of data, which can be anything from one
340 * byte to a set of lines and possible just a piece of the last
343 ssize_t clipamount = 0;
344 bool restart = FALSE;
346 data->req.headerbytecount += (long)gotbytes;
348 pp->nread_resp += gotbytes;
349 for(i = 0; i < gotbytes; ptr++, i++) {
352 /* a newline is CRLF in pp-talk, so the CR is ignored as
353 the line isn't really terminated until the LF comes */
355 /* output debug output if that is requested */
357 if(!conn->sec_complete)
359 if(data->set.verbose)
360 Curl_debug(data, CURLINFO_HEADER_IN,
361 pp->linestart_resp, (size_t)perline, conn);
364 * We pass all response-lines to the callback function registered
365 * for "headers". The response lines can be seen as a kind of
368 result = Curl_client_write(conn, CLIENTWRITE_HEADER,
369 pp->linestart_resp, perline);
373 if(pp->endofresp(conn, pp->linestart_resp, perline, code)) {
374 /* This is the end of the last line, copy the last line to the
375 start of the buffer and zero terminate, for old times sake */
376 size_t n = ptr - pp->linestart_resp;
377 memmove(buf, pp->linestart_resp, n);
378 buf[n]=0; /* zero terminate */
380 pp->linestart_resp = ptr+1; /* advance pointer */
381 i++; /* skip this before getting out */
383 *size = pp->nread_resp; /* size of the response */
384 pp->nread_resp = 0; /* restart */
387 perline=0; /* line starts over here */
388 pp->linestart_resp = ptr+1;
392 if(!keepon && (i != gotbytes)) {
393 /* We found the end of the response lines, but we didn't parse the
394 full chunk of data we have read from the server. We therefore need
395 to store the rest of the data to be checked on the next invoke as
396 it may actually contain another end of response already! */
397 clipamount = gotbytes - i;
399 DEBUGF(infof(data, "Curl_pp_readresp_ %d bytes of trailing "
400 "server response left\n",
405 if((perline == gotbytes) && (gotbytes > BUFSIZE/2)) {
406 /* We got an excessive line without newlines and we need to deal
407 with it. We keep the first bytes of the line then we throw
409 infof(data, "Excessive server response line length received, "
410 "%zd bytes. Stripping\n", gotbytes);
413 /* we keep 40 bytes since all our pingpong protocols are only
414 interested in the first piece */
417 else if(pp->nread_resp > BUFSIZE/2) {
418 /* We got a large chunk of data and there's potentially still
419 trailing data to take care of, so we put any such part in the
420 "cache", clear the buffer to make space and restart. */
421 clipamount = perline;
425 else if(i == gotbytes)
429 pp->cache_size = clipamount;
430 pp->cache = malloc(pp->cache_size);
432 memcpy(pp->cache, pp->linestart_resp, pp->cache_size);
434 return CURLE_OUT_OF_MEMORY;
437 /* now reset a few variables to start over nicely from the start of
439 pp->nread_resp = 0; /* start over from scratch in the buffer */
440 ptr = pp->linestart_resp = buf;
444 } /* there was data */
446 } /* while there's buffer left and loop is requested */
448 pp->pending_resp = FALSE;
453 int Curl_pp_getsock(struct pingpong *pp,
454 curl_socket_t *socks,
457 struct connectdata *conn = pp->conn;
460 return GETSOCK_BLANK;
462 socks[0] = conn->sock[FIRSTSOCKET];
466 return GETSOCK_WRITESOCK(0);
470 return GETSOCK_READSOCK(0);
473 CURLcode Curl_pp_flushsend(struct pingpong *pp)
475 /* we have a piece of a command still left to send */
476 struct connectdata *conn = pp->conn;
478 curl_socket_t sock = conn->sock[FIRSTSOCKET];
479 CURLcode result = Curl_write(conn, sock, pp->sendthis + pp->sendsize -
480 pp->sendleft, pp->sendleft, &written);
484 if(written != (ssize_t)pp->sendleft) {
485 /* only a fraction was sent */
486 pp->sendleft -= written;
491 pp->sendleft = pp->sendsize = 0;
492 pp->response = Curl_tvnow();
497 CURLcode Curl_pp_disconnect(struct pingpong *pp)
504 bool Curl_pp_moredata(struct pingpong *pp)
506 return (!pp->sendleft && pp->cache && pp->nread_resp < pp->cache_size) ?