1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2013, 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 http://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"
37 #define _MPRINTF_REPLACE /* use our functions only */
38 #include <curl/mprintf.h>
40 #include "curl_memory.h"
41 /* The last #include file should be: */
46 /* Returns timeout in ms. 0 or negative number means the timeout has already
48 long Curl_pp_state_timeout(struct pingpong *pp)
50 struct connectdata *conn = pp->conn;
51 struct SessionHandle *data=conn->data;
52 long timeout_ms; /* in milliseconds */
53 long timeout2_ms; /* in milliseconds */
54 long response_time= (data->set.server_response_timeout)?
55 data->set.server_response_timeout: pp->response_time;
57 /* if CURLOPT_SERVER_RESPONSE_TIMEOUT is set, use that to determine
58 remaining time, or use pp->response because SERVER_RESPONSE_TIMEOUT is
59 supposed to govern the response for any given server response, not for
60 the time from connect to the given server response. */
62 /* Without a requested timeout, we only wait 'response_time' seconds for the
63 full response to arrive before we bail out */
64 timeout_ms = response_time -
65 Curl_tvdiff(Curl_tvnow(), pp->response); /* spent time */
67 if(data->set.timeout) {
68 /* if timeout is requested, find out how much remaining time we have */
69 timeout2_ms = data->set.timeout - /* timeout time */
70 Curl_tvdiff(Curl_tvnow(), conn->now); /* spent time */
72 /* pick the lowest number */
73 timeout_ms = CURLMIN(timeout_ms, timeout2_ms);
82 CURLcode Curl_pp_statemach(struct pingpong *pp, bool block)
84 struct connectdata *conn = pp->conn;
85 curl_socket_t sock = conn->sock[FIRSTSOCKET];
88 long timeout_ms = Curl_pp_state_timeout(pp);
89 struct SessionHandle *data=conn->data;
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_pp_moredata(pp))
106 /* We are receiving and there is data in the cache so just read it */
109 rc = Curl_socket_ready(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
110 pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
114 /* if we didn't wait, we don't have to spend time on this now */
115 if(Curl_pgrsUpdate(conn))
116 result = CURLE_ABORTED_BY_CALLBACK;
118 result = Curl_speedcheck(data, Curl_tvnow());
125 failf(data, "select/poll error");
126 result = CURLE_OUT_OF_MEMORY;
129 result = pp->statemach_act(conn);
134 /* initialize stuff to prepare for reading a fresh new response */
135 void Curl_pp_init(struct pingpong *pp)
137 struct connectdata *conn = pp->conn;
139 pp->linestart_resp = conn->data->state.buffer;
140 pp->pending_resp = TRUE;
141 pp->response = Curl_tvnow(); /* start response time-out now! */
146 /***********************************************************************
150 * Send the formated string as a command to a pingpong server. Note that
151 * the string should not have any CRLF appended, as this function will
152 * append the necessary things itself.
154 * made to never block
156 CURLcode Curl_pp_vsendf(struct pingpong *pp,
160 ssize_t bytes_written;
165 struct connectdata *conn = pp->conn;
166 struct SessionHandle *data = conn->data;
169 enum protection_level data_sec = conn->data_prot;
172 DEBUGASSERT(pp->sendleft == 0);
173 DEBUGASSERT(pp->sendsize == 0);
174 DEBUGASSERT(pp->sendthis == NULL);
176 fmt_crlf = aprintf("%s\r\n", fmt); /* append a trailing CRLF */
178 return CURLE_OUT_OF_MEMORY;
180 s = vaprintf(fmt_crlf, args); /* trailing CRLF appended */
183 return CURLE_OUT_OF_MEMORY;
186 write_len = strlen(s);
190 error = Curl_convert_to_network(data, s, write_len);
191 /* Curl_convert_to_network calls failf if unsuccessful */
198 conn->data_prot = PROT_CMD;
200 error = Curl_write(conn, conn->sock[FIRSTSOCKET], s, write_len,
203 DEBUGASSERT(data_sec > PROT_NONE && data_sec < PROT_LAST);
204 conn->data_prot = data_sec;
212 if(conn->data->set.verbose)
213 Curl_debug(conn->data, CURLINFO_HEADER_OUT,
214 s, (size_t)bytes_written, conn);
216 if(bytes_written != (ssize_t)write_len) {
217 /* the whole chunk was not sent, keep it around and adjust sizes */
219 pp->sendsize = write_len;
220 pp->sendleft = write_len - bytes_written;
225 pp->sendleft = pp->sendsize = 0;
226 pp->response = Curl_tvnow();
233 /***********************************************************************
237 * Send the formated string as a command to a pingpong server. Note that
238 * the string should not have any CRLF appended, as this function will
239 * append the necessary things itself.
241 * made to never block
243 CURLcode Curl_pp_sendf(struct pingpong *pp,
244 const char *fmt, ...)
250 res = Curl_pp_vsendf(pp, fmt, ap);
260 * Reads a piece of a server response.
262 CURLcode Curl_pp_readresp(curl_socket_t sockfd,
264 int *code, /* return the server code if done */
265 size_t *size) /* size of the response */
267 ssize_t perline; /* count bytes per line */
271 struct connectdata *conn = pp->conn;
272 struct SessionHandle *data = conn->data;
273 char * const buf = data->state.buffer;
274 CURLcode result = CURLE_OK;
276 *code = 0; /* 0 for errors or not done */
279 ptr=buf + pp->nread_resp;
281 /* number of bytes in the current line, so far */
282 perline = (ssize_t)(ptr-pp->linestart_resp);
286 while((pp->nread_resp<BUFSIZE) && (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 DEBUGASSERT((ptr+pp->cache_size) <= (buf+BUFSIZE+1));
297 memcpy(ptr, pp->cache, pp->cache_size);
298 gotbytes = (ssize_t)pp->cache_size;
299 free(pp->cache); /* free the cache */
300 pp->cache = NULL; /* clear the pointer */
301 pp->cache_size = 0; /* zero the size just in case */
306 enum protection_level prot = conn->data_prot;
307 conn->data_prot = PROT_CLEAR;
309 DEBUGASSERT((ptr+BUFSIZE-pp->nread_resp) <= (buf+BUFSIZE+1));
310 res = Curl_read(conn, sockfd, ptr, BUFSIZE-pp->nread_resp,
313 DEBUGASSERT(prot > PROT_NONE && prot < PROT_LAST);
314 conn->data_prot = prot;
316 if(res == CURLE_AGAIN)
317 return CURLE_OK; /* return */
319 if((res == CURLE_OK) && (gotbytes > 0))
320 /* convert from the network encoding */
321 res = Curl_convert_from_network(data, ptr, gotbytes);
322 /* Curl_convert_from_network calls failf if unsuccessful */
324 if(CURLE_OK != res) {
325 result = (CURLcode)res; /* Set outer result variable to this error. */
332 else if(gotbytes <= 0) {
334 result = CURLE_RECV_ERROR;
335 failf(data, "response reading failed");
338 /* we got a whole chunk of data, which can be anything from one
339 * byte to a set of lines and possible just a piece of the last
342 ssize_t clipamount = 0;
343 bool restart = FALSE;
345 data->req.headerbytecount += (long)gotbytes;
347 pp->nread_resp += gotbytes;
348 for(i = 0; i < gotbytes; ptr++, i++) {
351 /* a newline is CRLF in pp-talk, so the CR is ignored as
352 the line isn't really terminated until the LF comes */
354 /* output debug output if that is requested */
356 if(!conn->sec_complete)
358 if(data->set.verbose)
359 Curl_debug(data, CURLINFO_HEADER_IN,
360 pp->linestart_resp, (size_t)perline, conn);
363 * We pass all response-lines to the callback function registered
364 * for "headers". The response lines can be seen as a kind of
367 result = Curl_client_write(conn, CLIENTWRITE_HEADER,
368 pp->linestart_resp, perline);
372 if(pp->endofresp(conn, pp->linestart_resp, perline, code)) {
373 /* This is the end of the last line, copy the last line to the
374 start of the buffer and zero terminate, for old times sake */
377 for(meow=pp->linestart_resp, n=0; meow<ptr; meow++, n++)
379 *meow=0; /* zero terminate */
381 pp->linestart_resp = ptr+1; /* advance pointer */
382 i++; /* skip this before getting out */
384 *size = pp->nread_resp; /* size of the response */
385 pp->nread_resp = 0; /* restart */
388 perline=0; /* line starts over here */
389 pp->linestart_resp = ptr+1;
393 if(!keepon && (i != gotbytes)) {
394 /* We found the end of the response lines, but we didn't parse the
395 full chunk of data we have read from the server. We therefore need
396 to store the rest of the data to be checked on the next invoke as
397 it may actually contain another end of response already! */
398 clipamount = gotbytes - i;
400 DEBUGF(infof(data, "Curl_pp_readresp_ %d bytes of trailing "
401 "server response left\n",
406 if((perline == gotbytes) && (gotbytes > BUFSIZE/2)) {
407 /* We got an excessive line without newlines and we need to deal
408 with it. We keep the first bytes of the line then we throw
410 infof(data, "Excessive server response line length received, "
411 "%zd bytes. Stripping\n", gotbytes);
414 /* we keep 40 bytes since all our pingpong protocols are only
415 interested in the first piece */
418 else if(pp->nread_resp > BUFSIZE/2) {
419 /* We got a large chunk of data and there's potentially still
420 trailing data to take care of, so we put any such part in the
421 "cache", clear the buffer to make space and restart. */
422 clipamount = perline;
426 else if(i == gotbytes)
430 pp->cache_size = clipamount;
431 pp->cache = malloc(pp->cache_size);
433 memcpy(pp->cache, pp->linestart_resp, pp->cache_size);
435 return CURLE_OUT_OF_MEMORY;
438 /* now reset a few variables to start over nicely from the start of
440 pp->nread_resp = 0; /* start over from scratch in the buffer */
441 ptr = pp->linestart_resp = buf;
445 } /* there was data */
447 } /* while there's buffer left and loop is requested */
449 pp->pending_resp = FALSE;
454 int Curl_pp_getsock(struct pingpong *pp,
455 curl_socket_t *socks,
458 struct connectdata *conn = pp->conn;
461 return GETSOCK_BLANK;
463 socks[0] = conn->sock[FIRSTSOCKET];
467 return GETSOCK_WRITESOCK(0);
471 return GETSOCK_READSOCK(0);
474 CURLcode Curl_pp_flushsend(struct pingpong *pp)
476 /* we have a piece of a command still left to send */
477 struct connectdata *conn = pp->conn;
479 CURLcode result = CURLE_OK;
480 curl_socket_t sock = conn->sock[FIRSTSOCKET];
482 result = Curl_write(conn, sock, pp->sendthis + pp->sendsize -
483 pp->sendleft, pp->sendleft, &written);
487 if(written != (ssize_t)pp->sendleft) {
488 /* only a fraction was sent */
489 pp->sendleft -= written;
494 pp->sendleft = pp->sendsize = 0;
495 pp->response = Curl_tvnow();
500 CURLcode Curl_pp_disconnect(struct pingpong *pp)
509 bool Curl_pp_moredata(struct pingpong *pp)
511 return (!pp->sendleft && pp->cache && pp->nread_resp < pp->cache_size) ?