1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
9: *
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.
13: *
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.
17: *
18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19: * KIND, either express or implied.
20: *
21: ***************************************************************************/
22:
23: #include "curl_setup.h"
24:
25: #ifdef HAVE_NETINET_IN_H
26: #include <netinet/in.h>
27: #endif
28:
29: #ifdef HAVE_LINUX_TCP_H
30: #include <linux/tcp.h>
31: #endif
32:
33: #include <curl/curl.h>
34:
35: #include "urldata.h"
36: #include "sendf.h"
37: #include "connect.h"
38: #include "vtls/vtls.h"
39: #include "vssh/ssh.h"
40: #include "easyif.h"
41: #include "multiif.h"
42: #include "non-ascii.h"
43: #include "strerror.h"
44: #include "select.h"
45: #include "strdup.h"
46: #include "http2.h"
47:
48: /* The last 3 #include files should be in this order */
49: #include "curl_printf.h"
50: #include "curl_memory.h"
51: #include "memdebug.h"
52:
53: #ifdef CURL_DO_LINEEND_CONV
54: /*
55: * convert_lineends() changes CRLF (\r\n) end-of-line markers to a single LF
56: * (\n), with special processing for CRLF sequences that are split between two
57: * blocks of data. Remaining, bare CRs are changed to LFs. The possibly new
58: * size of the data is returned.
59: */
60: static size_t convert_lineends(struct Curl_easy *data,
61: char *startPtr, size_t size)
62: {
63: char *inPtr, *outPtr;
64:
65: /* sanity check */
66: if((startPtr == NULL) || (size < 1)) {
67: return size;
68: }
69:
70: if(data->state.prev_block_had_trailing_cr) {
71: /* The previous block of incoming data
72: had a trailing CR, which was turned into a LF. */
73: if(*startPtr == '\n') {
74: /* This block of incoming data starts with the
75: previous block's LF so get rid of it */
76: memmove(startPtr, startPtr + 1, size-1);
77: size--;
78: /* and it wasn't a bare CR but a CRLF conversion instead */
79: data->state.crlf_conversions++;
80: }
81: data->state.prev_block_had_trailing_cr = FALSE; /* reset the flag */
82: }
83:
84: /* find 1st CR, if any */
85: inPtr = outPtr = memchr(startPtr, '\r', size);
86: if(inPtr) {
87: /* at least one CR, now look for CRLF */
88: while(inPtr < (startPtr + size-1)) {
89: /* note that it's size-1, so we'll never look past the last byte */
90: if(memcmp(inPtr, "\r\n", 2) == 0) {
91: /* CRLF found, bump past the CR and copy the NL */
92: inPtr++;
93: *outPtr = *inPtr;
94: /* keep track of how many CRLFs we converted */
95: data->state.crlf_conversions++;
96: }
97: else {
98: if(*inPtr == '\r') {
99: /* lone CR, move LF instead */
100: *outPtr = '\n';
101: }
102: else {
103: /* not a CRLF nor a CR, just copy whatever it is */
104: *outPtr = *inPtr;
105: }
106: }
107: outPtr++;
108: inPtr++;
109: } /* end of while loop */
110:
111: if(inPtr < startPtr + size) {
112: /* handle last byte */
113: if(*inPtr == '\r') {
114: /* deal with a CR at the end of the buffer */
115: *outPtr = '\n'; /* copy a NL instead */
116: /* note that a CRLF might be split across two blocks */
117: data->state.prev_block_had_trailing_cr = TRUE;
118: }
119: else {
120: /* copy last byte */
121: *outPtr = *inPtr;
122: }
123: outPtr++;
124: }
125: if(outPtr < startPtr + size)
126: /* tidy up by null terminating the now shorter data */
127: *outPtr = '\0';
128:
129: return (outPtr - startPtr);
130: }
131: return size;
132: }
133: #endif /* CURL_DO_LINEEND_CONV */
134:
135: #ifdef USE_RECV_BEFORE_SEND_WORKAROUND
136: bool Curl_recv_has_postponed_data(struct connectdata *conn, int sockindex)
137: {
138: struct postponed_data * const psnd = &(conn->postponed[sockindex]);
139: return psnd->buffer && psnd->allocated_size &&
140: psnd->recv_size > psnd->recv_processed;
141: }
142:
143: static void pre_receive_plain(struct connectdata *conn, int num)
144: {
145: const curl_socket_t sockfd = conn->sock[num];
146: struct postponed_data * const psnd = &(conn->postponed[num]);
147: size_t bytestorecv = psnd->allocated_size - psnd->recv_size;
148: /* WinSock will destroy unread received data if send() is
149: failed.
150: To avoid lossage of received data, recv() must be
151: performed before every send() if any incoming data is
152: available. However, skip this, if buffer is already full. */
153: if((conn->handler->protocol&PROTO_FAMILY_HTTP) != 0 &&
154: conn->recv[num] == Curl_recv_plain &&
155: (!psnd->buffer || bytestorecv)) {
156: const int readymask = Curl_socket_check(sockfd, CURL_SOCKET_BAD,
157: CURL_SOCKET_BAD, 0);
158: if(readymask != -1 && (readymask & CURL_CSELECT_IN) != 0) {
159: /* Have some incoming data */
160: if(!psnd->buffer) {
161: /* Use buffer double default size for intermediate buffer */
162: psnd->allocated_size = 2 * conn->data->set.buffer_size;
163: psnd->buffer = malloc(psnd->allocated_size);
164: psnd->recv_size = 0;
165: psnd->recv_processed = 0;
166: #ifdef DEBUGBUILD
167: psnd->bindsock = sockfd; /* Used only for DEBUGASSERT */
168: #endif /* DEBUGBUILD */
169: bytestorecv = psnd->allocated_size;
170: }
171: if(psnd->buffer) {
172: ssize_t recvedbytes;
173: DEBUGASSERT(psnd->bindsock == sockfd);
174: recvedbytes = sread(sockfd, psnd->buffer + psnd->recv_size,
175: bytestorecv);
176: if(recvedbytes > 0)
177: psnd->recv_size += recvedbytes;
178: }
179: else
180: psnd->allocated_size = 0;
181: }
182: }
183: }
184:
185: static ssize_t get_pre_recved(struct connectdata *conn, int num, char *buf,
186: size_t len)
187: {
188: struct postponed_data * const psnd = &(conn->postponed[num]);
189: size_t copysize;
190: if(!psnd->buffer)
191: return 0;
192:
193: DEBUGASSERT(psnd->allocated_size > 0);
194: DEBUGASSERT(psnd->recv_size <= psnd->allocated_size);
195: DEBUGASSERT(psnd->recv_processed <= psnd->recv_size);
196: /* Check and process data that already received and storied in internal
197: intermediate buffer */
198: if(psnd->recv_size > psnd->recv_processed) {
199: DEBUGASSERT(psnd->bindsock == conn->sock[num]);
200: copysize = CURLMIN(len, psnd->recv_size - psnd->recv_processed);
201: memcpy(buf, psnd->buffer + psnd->recv_processed, copysize);
202: psnd->recv_processed += copysize;
203: }
204: else
205: copysize = 0; /* buffer was allocated, but nothing was received */
206:
207: /* Free intermediate buffer if it has no unprocessed data */
208: if(psnd->recv_processed == psnd->recv_size) {
209: free(psnd->buffer);
210: psnd->buffer = NULL;
211: psnd->allocated_size = 0;
212: psnd->recv_size = 0;
213: psnd->recv_processed = 0;
214: #ifdef DEBUGBUILD
215: psnd->bindsock = CURL_SOCKET_BAD;
216: #endif /* DEBUGBUILD */
217: }
218: return (ssize_t)copysize;
219: }
220: #else /* ! USE_RECV_BEFORE_SEND_WORKAROUND */
221: /* Use "do-nothing" macros instead of functions when workaround not used */
222: bool Curl_recv_has_postponed_data(struct connectdata *conn, int sockindex)
223: {
224: (void)conn;
225: (void)sockindex;
226: return false;
227: }
228: #define pre_receive_plain(c,n) do {} while(0)
229: #define get_pre_recved(c,n,b,l) 0
230: #endif /* ! USE_RECV_BEFORE_SEND_WORKAROUND */
231:
232: /* Curl_infof() is for info message along the way */
233:
234: void Curl_infof(struct Curl_easy *data, const char *fmt, ...)
235: {
236: if(data && data->set.verbose) {
237: va_list ap;
238: size_t len;
239: char print_buffer[2048 + 1];
240: va_start(ap, fmt);
241: len = mvsnprintf(print_buffer, sizeof(print_buffer), fmt, ap);
242: /*
243: * Indicate truncation of the input by replacing the last 3 characters
244: * with "...", and transfer the newline over in case the format had one.
245: */
246: if(len >= sizeof(print_buffer)) {
247: len = strlen(fmt);
248: if(fmt[--len] == '\n')
249: msnprintf(print_buffer + (sizeof(print_buffer) - 5), 5, "...\n");
250: else
251: msnprintf(print_buffer + (sizeof(print_buffer) - 4), 4, "...");
252: }
253: va_end(ap);
254: len = strlen(print_buffer);
255: Curl_debug(data, CURLINFO_TEXT, print_buffer, len);
256: }
257: }
258:
259: /* Curl_failf() is for messages stating why we failed.
260: * The message SHALL NOT include any LF or CR.
261: */
262:
263: void Curl_failf(struct Curl_easy *data, const char *fmt, ...)
264: {
265: if(data->set.verbose || data->set.errorbuffer) {
266: va_list ap;
267: size_t len;
268: char error[CURL_ERROR_SIZE + 2];
269: va_start(ap, fmt);
270: mvsnprintf(error, CURL_ERROR_SIZE, fmt, ap);
271: len = strlen(error);
272:
273: if(data->set.errorbuffer && !data->state.errorbuf) {
274: strcpy(data->set.errorbuffer, error);
275: data->state.errorbuf = TRUE; /* wrote error string */
276: }
277: if(data->set.verbose) {
278: error[len] = '\n';
279: error[++len] = '\0';
280: Curl_debug(data, CURLINFO_TEXT, error, len);
281: }
282: va_end(ap);
283: }
284: }
285:
286: /* Curl_sendf() sends formatted data to the server */
287: CURLcode Curl_sendf(curl_socket_t sockfd, struct connectdata *conn,
288: const char *fmt, ...)
289: {
290: struct Curl_easy *data = conn->data;
291: ssize_t bytes_written;
292: size_t write_len;
293: CURLcode result = CURLE_OK;
294: char *s;
295: char *sptr;
296: va_list ap;
297: va_start(ap, fmt);
298: s = vaprintf(fmt, ap); /* returns an allocated string */
299: va_end(ap);
300: if(!s)
301: return CURLE_OUT_OF_MEMORY; /* failure */
302:
303: bytes_written = 0;
304: write_len = strlen(s);
305: sptr = s;
306:
307: for(;;) {
308: /* Write the buffer to the socket */
309: result = Curl_write(conn, sockfd, sptr, write_len, &bytes_written);
310:
311: if(result)
312: break;
313:
314: if(data->set.verbose)
315: Curl_debug(data, CURLINFO_DATA_OUT, sptr, (size_t)bytes_written);
316:
317: if((size_t)bytes_written != write_len) {
318: /* if not all was written at once, we must advance the pointer, decrease
319: the size left and try again! */
320: write_len -= bytes_written;
321: sptr += bytes_written;
322: }
323: else
324: break;
325: }
326:
327: free(s); /* free the output string */
328:
329: return result;
330: }
331:
332: /*
333: * Curl_write() is an internal write function that sends data to the
334: * server. Works with plain sockets, SCP, SSL or kerberos.
335: *
336: * If the write would block (CURLE_AGAIN), we return CURLE_OK and
337: * (*written == 0). Otherwise we return regular CURLcode value.
338: */
339: CURLcode Curl_write(struct connectdata *conn,
340: curl_socket_t sockfd,
341: const void *mem,
342: size_t len,
343: ssize_t *written)
344: {
345: ssize_t bytes_written;
346: CURLcode result = CURLE_OK;
347: int num = (sockfd == conn->sock[SECONDARYSOCKET]);
348:
349: bytes_written = conn->send[num](conn, num, mem, len, &result);
350:
351: *written = bytes_written;
352: if(bytes_written >= 0)
353: /* we completely ignore the curlcode value when subzero is not returned */
354: return CURLE_OK;
355:
356: /* handle CURLE_AGAIN or a send failure */
357: switch(result) {
358: case CURLE_AGAIN:
359: *written = 0;
360: return CURLE_OK;
361:
362: case CURLE_OK:
363: /* general send failure */
364: return CURLE_SEND_ERROR;
365:
366: default:
367: /* we got a specific curlcode, forward it */
368: return result;
369: }
370: }
371:
372: ssize_t Curl_send_plain(struct connectdata *conn, int num,
373: const void *mem, size_t len, CURLcode *code)
374: {
375: curl_socket_t sockfd = conn->sock[num];
376: ssize_t bytes_written;
377: /* WinSock will destroy unread received data if send() is
378: failed.
379: To avoid lossage of received data, recv() must be
380: performed before every send() if any incoming data is
381: available. */
382: pre_receive_plain(conn, num);
383:
384: #if defined(MSG_FASTOPEN) && !defined(TCP_FASTOPEN_CONNECT) /* Linux */
385: if(conn->bits.tcp_fastopen) {
386: bytes_written = sendto(sockfd, mem, len, MSG_FASTOPEN,
387: conn->ip_addr->ai_addr, conn->ip_addr->ai_addrlen);
388: conn->bits.tcp_fastopen = FALSE;
389: }
390: else
391: #endif
392: bytes_written = swrite(sockfd, mem, len);
393:
394: *code = CURLE_OK;
395: if(-1 == bytes_written) {
396: int err = SOCKERRNO;
397:
398: if(
399: #ifdef WSAEWOULDBLOCK
400: /* This is how Windows does it */
401: (WSAEWOULDBLOCK == err)
402: #else
403: /* errno may be EWOULDBLOCK or on some systems EAGAIN when it returned
404: due to its inability to send off data without blocking. We therefore
405: treat both error codes the same here */
406: (EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err) ||
407: (EINPROGRESS == err)
408: #endif
409: ) {
410: /* this is just a case of EWOULDBLOCK */
411: bytes_written = 0;
412: *code = CURLE_AGAIN;
413: }
414: else {
415: char buffer[STRERROR_LEN];
416: failf(conn->data, "Send failure: %s",
417: Curl_strerror(err, buffer, sizeof(buffer)));
418: conn->data->state.os_errno = err;
419: *code = CURLE_SEND_ERROR;
420: }
421: }
422: return bytes_written;
423: }
424:
425: /*
426: * Curl_write_plain() is an internal write function that sends data to the
427: * server using plain sockets only. Otherwise meant to have the exact same
428: * proto as Curl_write()
429: */
430: CURLcode Curl_write_plain(struct connectdata *conn,
431: curl_socket_t sockfd,
432: const void *mem,
433: size_t len,
434: ssize_t *written)
435: {
436: ssize_t bytes_written;
437: CURLcode result;
438: int num = (sockfd == conn->sock[SECONDARYSOCKET]);
439:
440: bytes_written = Curl_send_plain(conn, num, mem, len, &result);
441:
442: *written = bytes_written;
443:
444: return result;
445: }
446:
447: ssize_t Curl_recv_plain(struct connectdata *conn, int num, char *buf,
448: size_t len, CURLcode *code)
449: {
450: curl_socket_t sockfd = conn->sock[num];
451: ssize_t nread;
452: /* Check and return data that already received and storied in internal
453: intermediate buffer */
454: nread = get_pre_recved(conn, num, buf, len);
455: if(nread > 0) {
456: *code = CURLE_OK;
457: return nread;
458: }
459:
460: nread = sread(sockfd, buf, len);
461:
462: *code = CURLE_OK;
463: if(-1 == nread) {
464: int err = SOCKERRNO;
465:
466: if(
467: #ifdef WSAEWOULDBLOCK
468: /* This is how Windows does it */
469: (WSAEWOULDBLOCK == err)
470: #else
471: /* errno may be EWOULDBLOCK or on some systems EAGAIN when it returned
472: due to its inability to send off data without blocking. We therefore
473: treat both error codes the same here */
474: (EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err)
475: #endif
476: ) {
477: /* this is just a case of EWOULDBLOCK */
478: *code = CURLE_AGAIN;
479: }
480: else {
481: char buffer[STRERROR_LEN];
482: failf(conn->data, "Recv failure: %s",
483: Curl_strerror(err, buffer, sizeof(buffer)));
484: conn->data->state.os_errno = err;
485: *code = CURLE_RECV_ERROR;
486: }
487: }
488: return nread;
489: }
490:
491: static CURLcode pausewrite(struct Curl_easy *data,
492: int type, /* what type of data */
493: const char *ptr,
494: size_t len)
495: {
496: /* signalled to pause sending on this connection, but since we have data
497: we want to send we need to dup it to save a copy for when the sending
498: is again enabled */
499: struct SingleRequest *k = &data->req;
500: struct UrlState *s = &data->state;
501: char *dupl;
502: unsigned int i;
503: bool newtype = TRUE;
504:
505: /* If this transfers over HTTP/2, pause the stream! */
506: Curl_http2_stream_pause(data, TRUE);
507:
508: if(s->tempcount) {
509: for(i = 0; i< s->tempcount; i++) {
510: if(s->tempwrite[i].type == type) {
511: /* data for this type exists */
512: newtype = FALSE;
513: break;
514: }
515: }
516: DEBUGASSERT(i < 3);
517: }
518: else
519: i = 0;
520:
521: if(!newtype) {
522: /* append new data to old data */
523:
524: /* figure out the new size of the data to save */
525: size_t newlen = len + s->tempwrite[i].len;
526: /* allocate the new memory area */
527: char *newptr = realloc(s->tempwrite[i].buf, newlen);
528: if(!newptr)
529: return CURLE_OUT_OF_MEMORY;
530: /* copy the new data to the end of the new area */
531: memcpy(newptr + s->tempwrite[i].len, ptr, len);
532:
533: /* update the pointer and the size */
534: s->tempwrite[i].buf = newptr;
535: s->tempwrite[i].len = newlen;
536:
537: len = newlen; /* for the debug output below */
538: }
539: else {
540: dupl = Curl_memdup(ptr, len);
541: if(!dupl)
542: return CURLE_OUT_OF_MEMORY;
543:
544: /* store this information in the state struct for later use */
545: s->tempwrite[i].buf = dupl;
546: s->tempwrite[i].len = len;
547: s->tempwrite[i].type = type;
548:
549: if(newtype)
550: s->tempcount++;
551: }
552:
553: /* mark the connection as RECV paused */
554: k->keepon |= KEEP_RECV_PAUSE;
555:
556: DEBUGF(infof(data, "Paused %zu bytes in buffer for type %02x\n",
557: len, type));
558:
559: return CURLE_OK;
560: }
561:
562:
563: /* chop_write() writes chunks of data not larger than CURL_MAX_WRITE_SIZE via
564: * client write callback(s) and takes care of pause requests from the
565: * callbacks.
566: */
567: static CURLcode chop_write(struct connectdata *conn,
568: int type,
569: char *optr,
570: size_t olen)
571: {
572: struct Curl_easy *data = conn->data;
573: curl_write_callback writeheader = NULL;
574: curl_write_callback writebody = NULL;
575: char *ptr = optr;
576: size_t len = olen;
577:
578: if(!len)
579: return CURLE_OK;
580:
581: /* If reading is paused, append this data to the already held data for this
582: type. */
583: if(data->req.keepon & KEEP_RECV_PAUSE)
584: return pausewrite(data, type, ptr, len);
585:
586: /* Determine the callback(s) to use. */
587: if(type & CLIENTWRITE_BODY)
588: writebody = data->set.fwrite_func;
589: if((type & CLIENTWRITE_HEADER) &&
590: (data->set.fwrite_header || data->set.writeheader)) {
591: /*
592: * Write headers to the same callback or to the especially setup
593: * header callback function (added after version 7.7.1).
594: */
595: writeheader =
596: data->set.fwrite_header? data->set.fwrite_header: data->set.fwrite_func;
597: }
598:
599: /* Chop data, write chunks. */
600: while(len) {
601: size_t chunklen = len <= CURL_MAX_WRITE_SIZE? len: CURL_MAX_WRITE_SIZE;
602:
603: if(writebody) {
604: size_t wrote;
605: Curl_set_in_callback(data, true);
606: wrote = writebody(ptr, 1, chunklen, data->set.out);
607: Curl_set_in_callback(data, false);
608:
609: if(CURL_WRITEFUNC_PAUSE == wrote) {
610: if(conn->handler->flags & PROTOPT_NONETWORK) {
611: /* Protocols that work without network cannot be paused. This is
612: actually only FILE:// just now, and it can't pause since the
613: transfer isn't done using the "normal" procedure. */
614: failf(data, "Write callback asked for PAUSE when not supported!");
615: return CURLE_WRITE_ERROR;
616: }
617: return pausewrite(data, type, ptr, len);
618: }
619: if(wrote != chunklen) {
620: failf(data, "Failed writing body (%zu != %zu)", wrote, chunklen);
621: return CURLE_WRITE_ERROR;
622: }
623: }
624:
625: ptr += chunklen;
626: len -= chunklen;
627: }
628:
629: if(writeheader) {
630: size_t wrote;
631: ptr = optr;
632: len = olen;
633: Curl_set_in_callback(data, true);
634: wrote = writeheader(ptr, 1, len, data->set.writeheader);
635: Curl_set_in_callback(data, false);
636:
637: if(CURL_WRITEFUNC_PAUSE == wrote)
638: /* here we pass in the HEADER bit only since if this was body as well
639: then it was passed already and clearly that didn't trigger the
640: pause, so this is saved for later with the HEADER bit only */
641: return pausewrite(data, CLIENTWRITE_HEADER, ptr, len);
642:
643: if(wrote != len) {
644: failf(data, "Failed writing header");
645: return CURLE_WRITE_ERROR;
646: }
647: }
648:
649: return CURLE_OK;
650: }
651:
652:
653: /* Curl_client_write() sends data to the write callback(s)
654:
655: The bit pattern defines to what "streams" to write to. Body and/or header.
656: The defines are in sendf.h of course.
657:
658: If CURL_DO_LINEEND_CONV is enabled, data is converted IN PLACE to the
659: local character encoding. This is a problem and should be changed in
660: the future to leave the original data alone.
661: */
662: CURLcode Curl_client_write(struct connectdata *conn,
663: int type,
664: char *ptr,
665: size_t len)
666: {
667: struct Curl_easy *data = conn->data;
668:
669: if(0 == len)
670: len = strlen(ptr);
671:
672: DEBUGASSERT(type <= 3);
673:
674: /* FTP data may need conversion. */
675: if((type & CLIENTWRITE_BODY) &&
676: (conn->handler->protocol & PROTO_FAMILY_FTP) &&
677: conn->proto.ftpc.transfertype == 'A') {
678: /* convert from the network encoding */
679: CURLcode result = Curl_convert_from_network(data, ptr, len);
680: /* Curl_convert_from_network calls failf if unsuccessful */
681: if(result)
682: return result;
683:
684: #ifdef CURL_DO_LINEEND_CONV
685: /* convert end-of-line markers */
686: len = convert_lineends(data, ptr, len);
687: #endif /* CURL_DO_LINEEND_CONV */
688: }
689:
690: return chop_write(conn, type, ptr, len);
691: }
692:
693: CURLcode Curl_read_plain(curl_socket_t sockfd,
694: char *buf,
695: size_t bytesfromsocket,
696: ssize_t *n)
697: {
698: ssize_t nread = sread(sockfd, buf, bytesfromsocket);
699:
700: if(-1 == nread) {
701: const int err = SOCKERRNO;
702: const bool return_error =
703: #ifdef USE_WINSOCK
704: WSAEWOULDBLOCK == err
705: #else
706: EWOULDBLOCK == err || EAGAIN == err || EINTR == err
707: #endif
708: ;
709: *n = 0; /* no data returned */
710: if(return_error)
711: return CURLE_AGAIN;
712: return CURLE_RECV_ERROR;
713: }
714:
715: *n = nread;
716: return CURLE_OK;
717: }
718:
719: /*
720: * Internal read-from-socket function. This is meant to deal with plain
721: * sockets, SSL sockets and kerberos sockets.
722: *
723: * Returns a regular CURLcode value.
724: */
725: CURLcode Curl_read(struct connectdata *conn, /* connection data */
726: curl_socket_t sockfd, /* read from this socket */
727: char *buf, /* store read data here */
728: size_t sizerequested, /* max amount to read */
729: ssize_t *n) /* amount bytes read */
730: {
731: CURLcode result = CURLE_RECV_ERROR;
732: ssize_t nread = 0;
733: size_t bytesfromsocket = 0;
734: char *buffertofill = NULL;
735: struct Curl_easy *data = conn->data;
736:
737: /* Set 'num' to 0 or 1, depending on which socket that has been sent here.
738: If it is the second socket, we set num to 1. Otherwise to 0. This lets
739: us use the correct ssl handle. */
740: int num = (sockfd == conn->sock[SECONDARYSOCKET]);
741:
742: *n = 0; /* reset amount to zero */
743:
744: bytesfromsocket = CURLMIN(sizerequested, (size_t)data->set.buffer_size);
745: buffertofill = buf;
746:
747: nread = conn->recv[num](conn, num, buffertofill, bytesfromsocket, &result);
748: if(nread < 0)
749: return result;
750:
751: *n += nread;
752:
753: return CURLE_OK;
754: }
755:
756: /* return 0 on success */
757: int Curl_debug(struct Curl_easy *data, curl_infotype type,
758: char *ptr, size_t size)
759: {
760: static const char s_infotype[CURLINFO_END][3] = {
761: "* ", "< ", "> ", "{ ", "} ", "{ ", "} " };
762: int rc = 0;
763:
764: #ifdef CURL_DOES_CONVERSIONS
765: char *buf = NULL;
766: size_t conv_size = 0;
767:
768: switch(type) {
769: case CURLINFO_HEADER_OUT:
770: buf = Curl_memdup(ptr, size);
771: if(!buf)
772: return 1;
773: conv_size = size;
774:
775: /* Special processing is needed for this block if it
776: * contains both headers and data (separated by CRLFCRLF).
777: * We want to convert just the headers, leaving the data as-is.
778: */
779: if(size > 4) {
780: size_t i;
781: for(i = 0; i < size-4; i++) {
782: if(memcmp(&buf[i], "\x0d\x0a\x0d\x0a", 4) == 0) {
783: /* convert everything through this CRLFCRLF but no further */
784: conv_size = i + 4;
785: break;
786: }
787: }
788: }
789:
790: Curl_convert_from_network(data, buf, conv_size);
791: /* Curl_convert_from_network calls failf if unsuccessful */
792: /* we might as well continue even if it fails... */
793: ptr = buf; /* switch pointer to use my buffer instead */
794: break;
795: default:
796: /* leave everything else as-is */
797: break;
798: }
799: #endif /* CURL_DOES_CONVERSIONS */
800:
801: if(data->set.fdebug) {
802: Curl_set_in_callback(data, true);
803: rc = (*data->set.fdebug)(data, type, ptr, size, data->set.debugdata);
804: Curl_set_in_callback(data, false);
805: }
806: else {
807: switch(type) {
808: case CURLINFO_TEXT:
809: case CURLINFO_HEADER_OUT:
810: case CURLINFO_HEADER_IN:
811: fwrite(s_infotype[type], 2, 1, data->set.err);
812: fwrite(ptr, size, 1, data->set.err);
813: #ifdef CURL_DOES_CONVERSIONS
814: if(size != conv_size) {
815: /* we had untranslated data so we need an explicit newline */
816: fwrite("\n", 1, 1, data->set.err);
817: }
818: #endif
819: break;
820: default: /* nada */
821: break;
822: }
823: }
824: #ifdef CURL_DOES_CONVERSIONS
825: free(buf);
826: #endif
827: return rc;
828: }
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