1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2011, 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 ***************************************************************************/
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);
81 * Curl_pp_multi_statemach()
83 * called repeatedly until done when the multi interface is used.
85 CURLcode Curl_pp_multi_statemach(struct pingpong *pp)
87 struct connectdata *conn = pp->conn;
88 curl_socket_t sock = conn->sock[FIRSTSOCKET];
90 struct SessionHandle *data=conn->data;
91 CURLcode result = CURLE_OK;
92 long timeout_ms = Curl_pp_state_timeout(pp);
95 failf(data, "server response timeout");
96 return CURLE_OPERATION_TIMEDOUT;
99 rc = Curl_socket_ready(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
100 pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
104 failf(data, "select/poll error");
105 return CURLE_OUT_OF_MEMORY;
108 result = pp->statemach_act(conn);
110 /* if rc == 0, then select() timed out */
116 * Curl_pp_easy_statemach()
118 * called repeatedly until done when the easy interface is used.
120 CURLcode Curl_pp_easy_statemach(struct pingpong *pp)
122 struct connectdata *conn = pp->conn;
123 curl_socket_t sock = conn->sock[FIRSTSOCKET];
126 long timeout_ms = Curl_pp_state_timeout(pp);
127 struct SessionHandle *data=conn->data;
130 if(timeout_ms <=0 ) {
131 failf(data, "server response timeout");
132 return CURLE_OPERATION_TIMEDOUT; /* already too little time */
135 interval_ms = 1000; /* use 1 second timeout intervals */
136 if(timeout_ms < interval_ms)
137 interval_ms = timeout_ms;
139 rc = Curl_socket_ready(pp->sendleft?CURL_SOCKET_BAD:sock, /* reading */
140 pp->sendleft?sock:CURL_SOCKET_BAD, /* writing */
143 if(Curl_pgrsUpdate(conn))
144 result = CURLE_ABORTED_BY_CALLBACK;
146 result = Curl_speedcheck(data, Curl_tvnow());
151 failf(data, "select/poll error");
152 result = CURLE_OUT_OF_MEMORY;
155 result = pp->statemach_act(conn);
160 /* initialize stuff to prepare for reading a fresh new response */
161 void Curl_pp_init(struct pingpong *pp)
163 struct connectdata *conn = pp->conn;
165 pp->linestart_resp = conn->data->state.buffer;
166 pp->pending_resp = TRUE;
167 pp->response = Curl_tvnow(); /* start response time-out now! */
172 /***********************************************************************
176 * Send the formated string as a command to a pingpong server. Note that
177 * the string should not have any CRLF appended, as this function will
178 * append the necessary things itself.
180 * made to never block
182 CURLcode Curl_pp_vsendf(struct pingpong *pp,
186 ssize_t bytes_written;
191 struct connectdata *conn = pp->conn;
192 struct SessionHandle *data = conn->data;
194 #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
195 enum protection_level data_sec = conn->data_prot;
198 DEBUGASSERT(pp->sendleft == 0);
199 DEBUGASSERT(pp->sendsize == 0);
200 DEBUGASSERT(pp->sendthis == NULL);
202 fmt_crlf = aprintf("%s\r\n", fmt); /* append a trailing CRLF */
204 return CURLE_OUT_OF_MEMORY;
206 s = vaprintf(fmt_crlf, args); /* trailing CRLF appended */
209 return CURLE_OUT_OF_MEMORY;
212 write_len = strlen(s);
216 error = Curl_convert_to_network(data, s, write_len);
217 /* Curl_convert_to_network calls failf if unsuccessful */
223 #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
224 conn->data_prot = PROT_CMD;
226 error = Curl_write(conn, conn->sock[FIRSTSOCKET], s, write_len,
228 #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
229 DEBUGASSERT(data_sec > PROT_NONE && data_sec < PROT_LAST);
230 conn->data_prot = data_sec;
238 if(conn->data->set.verbose)
239 Curl_debug(conn->data, CURLINFO_HEADER_OUT,
240 s, (size_t)bytes_written, conn);
242 if(bytes_written != (ssize_t)write_len) {
243 /* the whole chunk was not sent, keep it around and adjust sizes */
245 pp->sendsize = write_len;
246 pp->sendleft = write_len - bytes_written;
251 pp->sendleft = pp->sendsize = 0;
252 pp->response = Curl_tvnow();
259 /***********************************************************************
263 * Send the formated string as a command to a pingpong server. Note that
264 * the string should not have any CRLF appended, as this function will
265 * append the necessary things itself.
267 * made to never block
269 CURLcode Curl_pp_sendf(struct pingpong *pp,
270 const char *fmt, ...)
276 res = Curl_pp_vsendf(pp, fmt, ap);
286 * Reads a piece of a server response.
288 CURLcode Curl_pp_readresp(curl_socket_t sockfd,
290 int *code, /* return the server code if done */
291 size_t *size) /* size of the response */
293 ssize_t perline; /* count bytes per line */
297 struct connectdata *conn = pp->conn;
298 struct SessionHandle *data = conn->data;
299 char * const buf = data->state.buffer;
300 CURLcode result = CURLE_OK;
302 *code = 0; /* 0 for errors or not done */
305 ptr=buf + pp->nread_resp;
307 /* number of bytes in the current line, so far */
308 perline = (ssize_t)(ptr-pp->linestart_resp);
312 while((pp->nread_resp<BUFSIZE) && (keepon && !result)) {
315 /* we had data in the "cache", copy that instead of doing an actual
318 * ftp->cache_size is cast to int here. This should be safe,
319 * because it would have been populated with something of size
320 * int to begin with, even though its datatype may be larger
323 DEBUGASSERT((ptr+pp->cache_size) <= (buf+BUFSIZE+1));
324 memcpy(ptr, pp->cache, pp->cache_size);
325 gotbytes = (ssize_t)pp->cache_size;
326 free(pp->cache); /* free the cache */
327 pp->cache = NULL; /* clear the pointer */
328 pp->cache_size = 0; /* zero the size just in case */
332 #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
333 enum protection_level prot = conn->data_prot;
334 conn->data_prot = PROT_CLEAR;
336 DEBUGASSERT((ptr+BUFSIZE-pp->nread_resp) <= (buf+BUFSIZE+1));
337 res = Curl_read(conn, sockfd, ptr, BUFSIZE-pp->nread_resp,
339 #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
340 DEBUGASSERT(prot > PROT_NONE && prot < PROT_LAST);
341 conn->data_prot = prot;
343 if(res == CURLE_AGAIN)
344 return CURLE_OK; /* return */
346 if((res == CURLE_OK) && (gotbytes > 0))
347 /* convert from the network encoding */
348 res = Curl_convert_from_network(data, ptr, gotbytes);
349 /* Curl_convert_from_network calls failf if unsuccessful */
351 if(CURLE_OK != res) {
352 result = (CURLcode)res; /* Set outer result variable to this error. */
359 else if(gotbytes <= 0) {
361 result = CURLE_RECV_ERROR;
362 failf(data, "response reading failed");
365 /* we got a whole chunk of data, which can be anything from one
366 * byte to a set of lines and possible just a piece of the last
369 ssize_t clipamount = 0;
370 bool restart = FALSE;
372 data->req.headerbytecount += (long)gotbytes;
374 pp->nread_resp += gotbytes;
375 for(i = 0; i < gotbytes; ptr++, i++) {
378 /* a newline is CRLF in ftp-talk, so the CR is ignored as
379 the line isn't really terminated until the LF comes */
381 /* output debug output if that is requested */
382 #if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
383 if(!conn->sec_complete)
385 if(data->set.verbose)
386 Curl_debug(data, CURLINFO_HEADER_IN,
387 pp->linestart_resp, (size_t)perline, conn);
390 * We pass all response-lines to the callback function registered
391 * for "headers". The response lines can be seen as a kind of
394 result = Curl_client_write(conn, CLIENTWRITE_HEADER,
395 pp->linestart_resp, perline);
399 if(pp->endofresp(pp, code)) {
400 /* This is the end of the last line, copy the last line to the
401 start of the buffer and zero terminate, for old times sake (and
405 for(meow=pp->linestart_resp, n=0; meow<ptr; meow++, n++)
407 *meow=0; /* zero terminate */
409 pp->linestart_resp = ptr+1; /* advance pointer */
410 i++; /* skip this before getting out */
412 *size = pp->nread_resp; /* size of the response */
413 pp->nread_resp = 0; /* restart */
416 perline=0; /* line starts over here */
417 pp->linestart_resp = ptr+1;
421 if(!keepon && (i != gotbytes)) {
422 /* We found the end of the response lines, but we didn't parse the
423 full chunk of data we have read from the server. We therefore need
424 to store the rest of the data to be checked on the next invoke as
425 it may actually contain another end of response already! */
426 clipamount = gotbytes - i;
431 if((perline == gotbytes) && (gotbytes > BUFSIZE/2)) {
432 /* We got an excessive line without newlines and we need to deal
433 with it. We keep the first bytes of the line then we throw
435 infof(data, "Excessive server response line length received, "
436 "%zd bytes. Stripping\n", gotbytes);
439 /* we keep 40 bytes since all our pingpong protocols are only
440 interested in the first piece */
443 else if(pp->nread_resp > BUFSIZE/2) {
444 /* We got a large chunk of data and there's potentially still
445 trailing data to take care of, so we put any such part in the
446 "cache", clear the buffer to make space and restart. */
447 clipamount = perline;
451 else if(i == gotbytes)
455 pp->cache_size = clipamount;
456 pp->cache = malloc(pp->cache_size);
458 memcpy(pp->cache, pp->linestart_resp, pp->cache_size);
460 return CURLE_OUT_OF_MEMORY;
463 /* now reset a few variables to start over nicely from the start of
465 pp->nread_resp = 0; /* start over from scratch in the buffer */
466 ptr = pp->linestart_resp = buf;
470 } /* there was data */
472 } /* while there's buffer left and loop is requested */
474 pp->pending_resp = FALSE;
479 int Curl_pp_getsock(struct pingpong *pp,
480 curl_socket_t *socks,
483 struct connectdata *conn = pp->conn;
486 return GETSOCK_BLANK;
488 socks[0] = conn->sock[FIRSTSOCKET];
492 return GETSOCK_WRITESOCK(0);
496 return GETSOCK_READSOCK(0);
499 CURLcode Curl_pp_flushsend(struct pingpong *pp)
501 /* we have a piece of a command still left to send */
502 struct connectdata *conn = pp->conn;
504 CURLcode result = CURLE_OK;
505 curl_socket_t sock = conn->sock[FIRSTSOCKET];
507 result = Curl_write(conn, sock, pp->sendthis + pp->sendsize -
508 pp->sendleft, pp->sendleft, &written);
512 if(written != (ssize_t)pp->sendleft) {
513 /* only a fraction was sent */
514 pp->sendleft -= written;
519 pp->sendleft = pp->sendsize = 0;
520 pp->response = Curl_tvnow();
525 CURLcode Curl_pp_disconnect(struct pingpong *pp)