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 ***************************************************************************/
23 #include "curl_setup.h"
25 #include <curl/curl.h>
33 #include "non-ascii.h"
35 #define _MPRINTF_REPLACE /* use the internal *printf() functions */
36 #include <curl/mprintf.h>
38 #include "curl_memory.h"
41 /* The last #include file should be: */
44 #ifdef CURL_DO_LINEEND_CONV
46 * convert_lineends() changes CRLF (\r\n) end-of-line markers to a single LF
47 * (\n), with special processing for CRLF sequences that are split between two
48 * blocks of data. Remaining, bare CRs are changed to LFs. The possibly new
49 * size of the data is returned.
51 static size_t convert_lineends(struct SessionHandle *data,
52 char *startPtr, size_t size)
57 if((startPtr == NULL) || (size < 1)) {
61 if(data->state.prev_block_had_trailing_cr) {
62 /* The previous block of incoming data
63 had a trailing CR, which was turned into a LF. */
64 if(*startPtr == '\n') {
65 /* This block of incoming data starts with the
66 previous block's LF so get rid of it */
67 memmove(startPtr, startPtr+1, size-1);
69 /* and it wasn't a bare CR but a CRLF conversion instead */
70 data->state.crlf_conversions++;
72 data->state.prev_block_had_trailing_cr = FALSE; /* reset the flag */
75 /* find 1st CR, if any */
76 inPtr = outPtr = memchr(startPtr, '\r', size);
78 /* at least one CR, now look for CRLF */
79 while(inPtr < (startPtr+size-1)) {
80 /* note that it's size-1, so we'll never look past the last byte */
81 if(memcmp(inPtr, "\r\n", 2) == 0) {
82 /* CRLF found, bump past the CR and copy the NL */
85 /* keep track of how many CRLFs we converted */
86 data->state.crlf_conversions++;
90 /* lone CR, move LF instead */
94 /* not a CRLF nor a CR, just copy whatever it is */
100 } /* end of while loop */
102 if(inPtr < startPtr+size) {
103 /* handle last byte */
105 /* deal with a CR at the end of the buffer */
106 *outPtr = '\n'; /* copy a NL instead */
107 /* note that a CRLF might be split across two blocks */
108 data->state.prev_block_had_trailing_cr = TRUE;
116 if(outPtr < startPtr+size)
117 /* tidy up by null terminating the now shorter data */
120 return(outPtr - startPtr);
124 #endif /* CURL_DO_LINEEND_CONV */
126 /* Curl_infof() is for info message along the way */
128 void Curl_infof(struct SessionHandle *data, const char *fmt, ...)
130 if(data && data->set.verbose) {
133 char print_buffer[2048 + 1];
135 vsnprintf(print_buffer, sizeof(print_buffer), fmt, ap);
137 len = strlen(print_buffer);
138 Curl_debug(data, CURLINFO_TEXT, print_buffer, len, NULL);
142 /* Curl_failf() is for messages stating why we failed.
143 * The message SHALL NOT include any LF or CR.
146 void Curl_failf(struct SessionHandle *data, const char *fmt, ...)
152 vsnprintf(data->state.buffer, BUFSIZE, fmt, ap);
154 if(data->set.errorbuffer && !data->state.errorbuf) {
155 snprintf(data->set.errorbuffer, CURL_ERROR_SIZE, "%s", data->state.buffer);
156 data->state.errorbuf = TRUE; /* wrote error string */
158 if(data->set.verbose) {
159 len = strlen(data->state.buffer);
160 if(len < BUFSIZE - 1) {
161 data->state.buffer[len] = '\n';
162 data->state.buffer[++len] = '\0';
164 Curl_debug(data, CURLINFO_TEXT, data->state.buffer, len, NULL);
170 /* Curl_sendf() sends formated data to the server */
171 CURLcode Curl_sendf(curl_socket_t sockfd, struct connectdata *conn,
172 const char *fmt, ...)
174 struct SessionHandle *data = conn->data;
175 ssize_t bytes_written;
177 CURLcode res = CURLE_OK;
182 s = vaprintf(fmt, ap); /* returns an allocated string */
185 return CURLE_OUT_OF_MEMORY; /* failure */
188 write_len = strlen(s);
192 /* Write the buffer to the socket */
193 res = Curl_write(conn, sockfd, sptr, write_len, &bytes_written);
198 if(data->set.verbose)
199 Curl_debug(data, CURLINFO_DATA_OUT, sptr, (size_t)bytes_written, conn);
201 if((size_t)bytes_written != write_len) {
202 /* if not all was written at once, we must advance the pointer, decrease
203 the size left and try again! */
204 write_len -= bytes_written;
205 sptr += bytes_written;
211 free(s); /* free the output string */
217 * Curl_write() is an internal write function that sends data to the
218 * server. Works with plain sockets, SCP, SSL or kerberos.
220 * If the write would block (CURLE_AGAIN), we return CURLE_OK and
221 * (*written == 0). Otherwise we return regular CURLcode value.
223 CURLcode Curl_write(struct connectdata *conn,
224 curl_socket_t sockfd,
229 ssize_t bytes_written;
230 CURLcode curlcode = CURLE_OK;
231 int num = (sockfd == conn->sock[SECONDARYSOCKET]);
233 bytes_written = conn->send[num](conn, num, mem, len, &curlcode);
235 *written = bytes_written;
236 if(bytes_written >= 0)
237 /* we completely ignore the curlcode value when subzero is not returned */
240 /* handle CURLE_AGAIN or a send failure */
247 /* general send failure */
248 return CURLE_SEND_ERROR;
251 /* we got a specific curlcode, forward it */
256 ssize_t Curl_send_plain(struct connectdata *conn, int num,
257 const void *mem, size_t len, CURLcode *code)
259 curl_socket_t sockfd = conn->sock[num];
260 ssize_t bytes_written = swrite(sockfd, mem, len);
263 if(-1 == bytes_written) {
267 #ifdef WSAEWOULDBLOCK
268 /* This is how Windows does it */
269 (WSAEWOULDBLOCK == err)
271 /* errno may be EWOULDBLOCK or on some systems EAGAIN when it returned
272 due to its inability to send off data without blocking. We therefor
273 treat both error codes the same here */
274 (EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err)
277 /* this is just a case of EWOULDBLOCK */
282 failf(conn->data, "Send failure: %s",
283 Curl_strerror(conn, err));
284 conn->data->state.os_errno = err;
285 *code = CURLE_SEND_ERROR;
288 return bytes_written;
292 * Curl_write_plain() is an internal write function that sends data to the
293 * server using plain sockets only. Otherwise meant to have the exact same
294 * proto as Curl_write()
296 CURLcode Curl_write_plain(struct connectdata *conn,
297 curl_socket_t sockfd,
302 ssize_t bytes_written;
304 int num = (sockfd == conn->sock[SECONDARYSOCKET]);
306 bytes_written = Curl_send_plain(conn, num, mem, len, &retcode);
308 *written = bytes_written;
313 ssize_t Curl_recv_plain(struct connectdata *conn, int num, char *buf,
314 size_t len, CURLcode *code)
316 curl_socket_t sockfd = conn->sock[num];
317 ssize_t nread = sread(sockfd, buf, len);
324 #ifdef WSAEWOULDBLOCK
325 /* This is how Windows does it */
326 (WSAEWOULDBLOCK == err)
328 /* errno may be EWOULDBLOCK or on some systems EAGAIN when it returned
329 due to its inability to send off data without blocking. We therefor
330 treat both error codes the same here */
331 (EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err)
334 /* this is just a case of EWOULDBLOCK */
338 failf(conn->data, "Recv failure: %s",
339 Curl_strerror(conn, err));
340 conn->data->state.os_errno = err;
341 *code = CURLE_RECV_ERROR;
347 static CURLcode pausewrite(struct SessionHandle *data,
348 int type, /* what type of data */
352 /* signalled to pause sending on this connection, but since we have data
353 we want to send we need to dup it to save a copy for when the sending
355 struct SingleRequest *k = &data->req;
356 char *dupl = malloc(len);
358 return CURLE_OUT_OF_MEMORY;
360 memcpy(dupl, ptr, len);
362 /* store this information in the state struct for later use */
363 data->state.tempwrite = dupl;
364 data->state.tempwritesize = len;
365 data->state.tempwritetype = type;
367 /* mark the connection as RECV paused */
368 k->keepon |= KEEP_RECV_PAUSE;
370 DEBUGF(infof(data, "Pausing with %zu bytes in buffer for type %02x\n",
377 /* Curl_client_write() sends data to the write callback(s)
379 The bit pattern defines to what "streams" to write to. Body and/or header.
380 The defines are in sendf.h of course.
382 If CURL_DO_LINEEND_CONV is enabled, data is converted IN PLACE to the
383 local character encoding. This is a problem and should be changed in
384 the future to leave the original data alone.
386 CURLcode Curl_client_write(struct connectdata *conn,
391 struct SessionHandle *data = conn->data;
397 /* If reading is actually paused, we're forced to append this chunk of data
398 to the already held data, but only if it is the same type as otherwise it
399 can't work and it'll return error instead. */
400 if(data->req.keepon & KEEP_RECV_PAUSE) {
403 if(type != data->state.tempwritetype)
404 /* major internal confusion */
405 return CURLE_RECV_ERROR;
407 DEBUGASSERT(data->state.tempwrite);
409 /* figure out the new size of the data to save */
410 newlen = len + data->state.tempwritesize;
411 /* allocate the new memory area */
412 newptr = realloc(data->state.tempwrite, newlen);
414 return CURLE_OUT_OF_MEMORY;
415 /* copy the new data to the end of the new area */
416 memcpy(newptr + data->state.tempwritesize, ptr, len);
417 /* update the pointer and the size */
418 data->state.tempwrite = newptr;
419 data->state.tempwritesize = newlen;
424 if(type & CLIENTWRITE_BODY) {
425 if((conn->handler->protocol&CURLPROTO_FTP) &&
426 conn->proto.ftpc.transfertype == 'A') {
427 /* convert from the network encoding */
428 CURLcode rc = Curl_convert_from_network(data, ptr, len);
429 /* Curl_convert_from_network calls failf if unsuccessful */
433 #ifdef CURL_DO_LINEEND_CONV
434 /* convert end-of-line markers */
435 len = convert_lineends(data, ptr, len);
436 #endif /* CURL_DO_LINEEND_CONV */
438 /* If the previous block of data ended with CR and this block of data is
439 just a NL, then the length might be zero */
441 wrote = data->set.fwrite_func(ptr, 1, len, data->set.out);
447 if(CURL_WRITEFUNC_PAUSE == wrote)
448 return pausewrite(data, type, ptr, len);
451 failf(data, "Failed writing body (%zu != %zu)", wrote, len);
452 return CURLE_WRITE_ERROR;
456 if((type & CLIENTWRITE_HEADER) &&
457 (data->set.fwrite_header || data->set.writeheader) ) {
459 * Write headers to the same callback or to the especially setup
460 * header callback function (added after version 7.7.1).
462 curl_write_callback writeit=
463 data->set.fwrite_header?data->set.fwrite_header:data->set.fwrite_func;
465 /* Note: The header is in the host encoding
466 regardless of the ftp transfer mode (ASCII/Image) */
468 wrote = writeit(ptr, 1, len, data->set.writeheader);
469 if(CURL_WRITEFUNC_PAUSE == wrote)
470 /* here we pass in the HEADER bit only since if this was body as well
471 then it was passed already and clearly that didn't trigger the pause,
472 so this is saved for later with the HEADER bit only */
473 return pausewrite(data, CLIENTWRITE_HEADER, ptr, len);
476 failf (data, "Failed writing header");
477 return CURLE_WRITE_ERROR;
484 CURLcode Curl_read_plain(curl_socket_t sockfd,
486 size_t bytesfromsocket,
489 ssize_t nread = sread(sockfd, buf, bytesfromsocket);
494 if(WSAEWOULDBLOCK == err)
496 if((EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err))
500 return CURLE_RECV_ERROR;
503 /* we only return number of bytes read when we return OK */
509 * Internal read-from-socket function. This is meant to deal with plain
510 * sockets, SSL sockets and kerberos sockets.
512 * Returns a regular CURLcode value.
514 CURLcode Curl_read(struct connectdata *conn, /* connection data */
515 curl_socket_t sockfd, /* read from this socket */
516 char *buf, /* store read data here */
517 size_t sizerequested, /* max amount to read */
518 ssize_t *n) /* amount bytes read */
520 CURLcode curlcode = CURLE_RECV_ERROR;
522 size_t bytesfromsocket = 0;
523 char *buffertofill = NULL;
524 bool pipelining = Curl_multi_pipeline_enabled(conn->data->multi);
526 /* Set 'num' to 0 or 1, depending on which socket that has been sent here.
527 If it is the second socket, we set num to 1. Otherwise to 0. This lets
528 us use the correct ssl handle. */
529 int num = (sockfd == conn->sock[SECONDARYSOCKET]);
531 *n=0; /* reset amount to zero */
533 /* If session can pipeline, check connection buffer */
535 size_t bytestocopy = CURLMIN(conn->buf_len - conn->read_pos,
538 /* Copy from our master buffer first if we have some unread data there*/
539 if(bytestocopy > 0) {
540 memcpy(buf, conn->master_buffer + conn->read_pos, bytestocopy);
541 conn->read_pos += bytestocopy;
542 conn->bits.stream_was_rewound = FALSE;
544 *n = (ssize_t)bytestocopy;
547 /* If we come here, it means that there is no data to read from the buffer,
548 * so we read from the socket */
549 bytesfromsocket = CURLMIN(sizerequested, BUFSIZE * sizeof (char));
550 buffertofill = conn->master_buffer;
553 bytesfromsocket = CURLMIN((long)sizerequested,
554 conn->data->set.buffer_size ?
555 conn->data->set.buffer_size : BUFSIZE);
559 nread = conn->recv[num](conn, num, buffertofill, bytesfromsocket, &curlcode);
564 memcpy(buf, conn->master_buffer, nread);
565 conn->buf_len = nread;
566 conn->read_pos = nread;
574 /* return 0 on success */
575 static int showit(struct SessionHandle *data, curl_infotype type,
576 char *ptr, size_t size)
578 static const char s_infotype[CURLINFO_END][3] = {
579 "* ", "< ", "> ", "{ ", "} ", "{ ", "} " };
581 #ifdef CURL_DOES_CONVERSIONS
583 size_t conv_size = 0;
586 case CURLINFO_HEADER_OUT:
587 /* assume output headers are ASCII */
588 /* copy the data into my buffer so the original is unchanged */
590 size = BUFSIZE; /* truncate if necessary */
594 memcpy(buf, ptr, size);
595 /* Special processing is needed for this block if it
596 * contains both headers and data (separated by CRLFCRLF).
597 * We want to convert just the headers, leaving the data as-is.
601 for(i = 0; i < size-4; i++) {
602 if(memcmp(&buf[i], "\x0d\x0a\x0d\x0a", 4) == 0) {
603 /* convert everything through this CRLFCRLF but no further */
610 Curl_convert_from_network(data, buf, conv_size);
611 /* Curl_convert_from_network calls failf if unsuccessful */
612 /* we might as well continue even if it fails... */
613 ptr = buf; /* switch pointer to use my buffer instead */
616 /* leave everything else as-is */
619 #endif /* CURL_DOES_CONVERSIONS */
622 return (*data->set.fdebug)(data, type, ptr, size,
623 data->set.debugdata);
627 case CURLINFO_HEADER_OUT:
628 case CURLINFO_HEADER_IN:
629 fwrite(s_infotype[type], 2, 1, data->set.err);
630 fwrite(ptr, size, 1, data->set.err);
631 #ifdef CURL_DOES_CONVERSIONS
632 if(size != conv_size) {
633 /* we had untranslated data so we need an explicit newline */
634 fwrite("\n", 1, 1, data->set.err);
644 int Curl_debug(struct SessionHandle *data, curl_infotype type,
645 char *ptr, size_t size,
646 struct connectdata *conn)
649 if(data->set.printhost && conn && conn->host.dispname) {
652 const char *w="Data";
654 case CURLINFO_HEADER_IN:
656 case CURLINFO_DATA_IN:
659 case CURLINFO_HEADER_OUT:
661 case CURLINFO_DATA_OUT:
669 snprintf(buffer, sizeof(buffer), "[%s %s %s]", w, t,
670 conn->host.dispname);
671 rc = showit(data, CURLINFO_TEXT, buffer, strlen(buffer));
676 rc = showit(data, type, ptr, size);