| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | * SPDX-License-Identifier: curl
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #ifdef HAVE_NETINET_IN_H
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| 28 | #include <netinet/in.h>
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| 29 | #endif
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| 30 |
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| 31 | #ifdef HAVE_LINUX_TCP_H
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| 32 | #include <linux/tcp.h>
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| 33 | #elif defined(HAVE_NETINET_TCP_H)
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| 34 | #include <netinet/tcp.h>
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| 35 | #endif
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| 36 |
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| 37 | #include <curl/curl.h>
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| 38 |
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| 39 | #include "urldata.h"
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| 40 | #include "sendf.h"
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| 41 | #include "cfilters.h"
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| 42 | #include "connect.h"
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| 43 | #include "vtls/vtls.h"
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| 44 | #include "vssh/ssh.h"
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| 45 | #include "easyif.h"
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| 46 | #include "multiif.h"
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| 47 | #include "strerror.h"
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| 48 | #include "select.h"
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| 49 | #include "strdup.h"
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| 50 | #include "http2.h"
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| 51 | #include "headers.h"
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| 52 | #include "ws.h"
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| 53 |
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| 54 | /* The last 3 #include files should be in this order */
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| 55 | #include "curl_printf.h"
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| 56 | #include "curl_memory.h"
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| 57 | #include "memdebug.h"
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| 58 |
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| 59 | #if defined(CURL_DO_LINEEND_CONV) && !defined(CURL_DISABLE_FTP)
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| 60 | /*
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| 61 | * convert_lineends() changes CRLF (\r\n) end-of-line markers to a single LF
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| 62 | * (\n), with special processing for CRLF sequences that are split between two
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| 63 | * blocks of data. Remaining, bare CRs are changed to LFs. The possibly new
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| 64 | * size of the data is returned.
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| 65 | */
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| 66 | static size_t convert_lineends(struct Curl_easy *data,
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| 67 | char *startPtr, size_t size)
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| 68 | {
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| 69 | char *inPtr, *outPtr;
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| 70 |
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| 71 | /* sanity check */
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| 72 | if(!startPtr || (size < 1)) {
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| 73 | return size;
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| 74 | }
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| 75 |
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| 76 | if(data->state.prev_block_had_trailing_cr) {
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| 77 | /* The previous block of incoming data
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| 78 | had a trailing CR, which was turned into a LF. */
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| 79 | if(*startPtr == '\n') {
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| 80 | /* This block of incoming data starts with the
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| 81 | previous block's LF so get rid of it */
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| 82 | memmove(startPtr, startPtr + 1, size-1);
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| 83 | size--;
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| 84 | /* and it wasn't a bare CR but a CRLF conversion instead */
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| 85 | data->state.crlf_conversions++;
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| 86 | }
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| 87 | data->state.prev_block_had_trailing_cr = FALSE; /* reset the flag */
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| 88 | }
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| 89 |
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| 90 | /* find 1st CR, if any */
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| 91 | inPtr = outPtr = memchr(startPtr, '\r', size);
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| 92 | if(inPtr) {
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| 93 | /* at least one CR, now look for CRLF */
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| 94 | while(inPtr < (startPtr + size-1)) {
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| 95 | /* note that it's size-1, so we'll never look past the last byte */
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| 96 | if(memcmp(inPtr, "\r\n", 2) == 0) {
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| 97 | /* CRLF found, bump past the CR and copy the NL */
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| 98 | inPtr++;
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| 99 | *outPtr = *inPtr;
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| 100 | /* keep track of how many CRLFs we converted */
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| 101 | data->state.crlf_conversions++;
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| 102 | }
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| 103 | else {
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| 104 | if(*inPtr == '\r') {
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| 105 | /* lone CR, move LF instead */
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| 106 | *outPtr = '\n';
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| 107 | }
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| 108 | else {
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| 109 | /* not a CRLF nor a CR, just copy whatever it is */
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| 110 | *outPtr = *inPtr;
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| 111 | }
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| 112 | }
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| 113 | outPtr++;
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| 114 | inPtr++;
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| 115 | } /* end of while loop */
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| 116 |
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| 117 | if(inPtr < startPtr + size) {
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| 118 | /* handle last byte */
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| 119 | if(*inPtr == '\r') {
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| 120 | /* deal with a CR at the end of the buffer */
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| 121 | *outPtr = '\n'; /* copy a NL instead */
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| 122 | /* note that a CRLF might be split across two blocks */
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| 123 | data->state.prev_block_had_trailing_cr = TRUE;
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| 124 | }
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| 125 | else {
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| 126 | /* copy last byte */
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| 127 | *outPtr = *inPtr;
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| 128 | }
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| 129 | outPtr++;
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| 130 | }
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| 131 | if(outPtr < startPtr + size)
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| 132 | /* tidy up by null terminating the now shorter data */
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| 133 | *outPtr = '\0';
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| 134 |
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| 135 | return (outPtr - startPtr);
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| 136 | }
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| 137 | return size;
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| 138 | }
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| 139 | #endif /* CURL_DO_LINEEND_CONV && !CURL_DISABLE_FTP */
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| 140 |
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| 141 | /*
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| 142 | * Curl_write() is an internal write function that sends data to the
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| 143 | * server. Works with plain sockets, SCP, SSL or kerberos.
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| 144 | *
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| 145 | * If the write would block (CURLE_AGAIN), we return CURLE_OK and
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| 146 | * (*written == 0). Otherwise we return regular CURLcode value.
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| 147 | */
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| 148 | CURLcode Curl_write(struct Curl_easy *data,
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| 149 | curl_socket_t sockfd,
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| 150 | const void *mem,
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| 151 | size_t len,
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| 152 | ssize_t *written)
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| 153 | {
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| 154 | ssize_t bytes_written;
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| 155 | CURLcode result = CURLE_OK;
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| 156 | struct connectdata *conn;
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| 157 | int num;
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| 158 | DEBUGASSERT(data);
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| 159 | DEBUGASSERT(data->conn);
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| 160 | conn = data->conn;
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| 161 | num = (sockfd != CURL_SOCKET_BAD && sockfd == conn->sock[SECONDARYSOCKET]);
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| 162 |
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| 163 | #ifdef CURLDEBUG
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| 164 | {
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| 165 | /* Allow debug builds to override this logic to force short sends
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| 166 | */
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| 167 | char *p = getenv("CURL_SMALLSENDS");
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| 168 | if(p) {
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| 169 | size_t altsize = (size_t)strtoul(p, NULL, 10);
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| 170 | if(altsize)
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| 171 | len = CURLMIN(len, altsize);
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| 172 | }
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| 173 | }
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| 174 | #endif
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| 175 | bytes_written = conn->send[num](data, num, mem, len, &result);
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| 176 |
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| 177 | *written = bytes_written;
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| 178 | if(bytes_written >= 0)
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| 179 | /* we completely ignore the curlcode value when subzero is not returned */
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| 180 | return CURLE_OK;
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| 181 |
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| 182 | /* handle CURLE_AGAIN or a send failure */
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| 183 | switch(result) {
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| 184 | case CURLE_AGAIN:
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| 185 | *written = 0;
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| 186 | return CURLE_OK;
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| 187 |
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| 188 | case CURLE_OK:
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| 189 | /* general send failure */
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| 190 | return CURLE_SEND_ERROR;
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| 191 |
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| 192 | default:
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| 193 | /* we got a specific curlcode, forward it */
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| 194 | return result;
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| 195 | }
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| 196 | }
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| 197 |
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| 198 | static CURLcode pausewrite(struct Curl_easy *data,
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| 199 | int type, /* what type of data */
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| 200 | const char *ptr,
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| 201 | size_t len)
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| 202 | {
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| 203 | /* signalled to pause sending on this connection, but since we have data
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| 204 | we want to send we need to dup it to save a copy for when the sending
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| 205 | is again enabled */
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| 206 | struct SingleRequest *k = &data->req;
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| 207 | struct UrlState *s = &data->state;
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| 208 | unsigned int i;
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| 209 | bool newtype = TRUE;
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| 210 |
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| 211 | Curl_conn_ev_data_pause(data, TRUE);
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| 212 |
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| 213 | if(s->tempcount) {
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| 214 | for(i = 0; i< s->tempcount; i++) {
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| 215 | if(s->tempwrite[i].type == type) {
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| 216 | /* data for this type exists */
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| 217 | newtype = FALSE;
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| 218 | break;
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| 219 | }
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| 220 | }
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| 221 | DEBUGASSERT(i < 3);
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| 222 | if(i >= 3)
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| 223 | /* There are more types to store than what fits: very bad */
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| 224 | return CURLE_OUT_OF_MEMORY;
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| 225 | }
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| 226 | else
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| 227 | i = 0;
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| 228 |
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| 229 | if(newtype) {
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| 230 | /* store this information in the state struct for later use */
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| 231 | Curl_dyn_init(&s->tempwrite[i].b, DYN_PAUSE_BUFFER);
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| 232 | s->tempwrite[i].type = type;
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| 233 | s->tempcount++;
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| 234 | }
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| 235 |
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| 236 | if(Curl_dyn_addn(&s->tempwrite[i].b, (unsigned char *)ptr, len))
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| 237 | return CURLE_OUT_OF_MEMORY;
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| 238 |
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| 239 | /* mark the connection as RECV paused */
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| 240 | k->keepon |= KEEP_RECV_PAUSE;
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| 241 |
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| 242 | return CURLE_OK;
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| 243 | }
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| 244 |
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| 245 |
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| 246 | /* chop_write() writes chunks of data not larger than CURL_MAX_WRITE_SIZE via
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| 247 | * client write callback(s) and takes care of pause requests from the
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| 248 | * callbacks.
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| 249 | */
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| 250 | static CURLcode chop_write(struct Curl_easy *data,
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| 251 | int type,
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| 252 | char *optr,
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| 253 | size_t olen)
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| 254 | {
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| 255 | struct connectdata *conn = data->conn;
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| 256 | curl_write_callback writeheader = NULL;
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| 257 | curl_write_callback writebody = NULL;
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| 258 | char *ptr = optr;
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| 259 | size_t len = olen;
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| 260 | void *writebody_ptr = data->set.out;
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| 261 |
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| 262 | if(!len)
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| 263 | return CURLE_OK;
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| 264 |
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| 265 | /* If reading is paused, append this data to the already held data for this
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| 266 | type. */
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| 267 | if(data->req.keepon & KEEP_RECV_PAUSE)
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| 268 | return pausewrite(data, type, ptr, len);
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| 269 |
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| 270 | /* Determine the callback(s) to use. */
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| 271 | if(type & CLIENTWRITE_BODY) {
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| 272 | #ifdef USE_WEBSOCKETS
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| 273 | if(conn->handler->protocol & (CURLPROTO_WS|CURLPROTO_WSS)) {
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| 274 | struct HTTP *ws = data->req.p.http;
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| 275 | writebody = Curl_ws_writecb;
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| 276 | ws->ws.data = data;
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| 277 | writebody_ptr = ws;
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| 278 | }
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| 279 | else
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| 280 | #endif
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| 281 | writebody = data->set.fwrite_func;
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| 282 | }
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| 283 | if((type & CLIENTWRITE_HEADER) &&
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| 284 | (data->set.fwrite_header || data->set.writeheader)) {
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| 285 | /*
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| 286 | * Write headers to the same callback or to the especially setup
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| 287 | * header callback function (added after version 7.7.1).
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| 288 | */
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| 289 | writeheader =
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| 290 | data->set.fwrite_header? data->set.fwrite_header: data->set.fwrite_func;
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| 291 | }
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| 292 |
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| 293 | /* Chop data, write chunks. */
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| 294 | while(len) {
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| 295 | size_t chunklen = len <= CURL_MAX_WRITE_SIZE? len: CURL_MAX_WRITE_SIZE;
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| 296 |
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| 297 | if(writebody) {
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| 298 | size_t wrote;
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| 299 | Curl_set_in_callback(data, true);
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| 300 | wrote = writebody(ptr, 1, chunklen, writebody_ptr);
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| 301 | Curl_set_in_callback(data, false);
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| 302 |
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| 303 | if(CURL_WRITEFUNC_PAUSE == wrote) {
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| 304 | if(conn->handler->flags & PROTOPT_NONETWORK) {
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| 305 | /* Protocols that work without network cannot be paused. This is
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| 306 | actually only FILE:// just now, and it can't pause since the
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| 307 | transfer isn't done using the "normal" procedure. */
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| 308 | failf(data, "Write callback asked for PAUSE when not supported");
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| 309 | return CURLE_WRITE_ERROR;
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| 310 | }
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| 311 | return pausewrite(data, type, ptr, len);
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| 312 | }
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| 313 | if(wrote != chunklen) {
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| 314 | failf(data, "Failure writing output to destination");
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| 315 | return CURLE_WRITE_ERROR;
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| 316 | }
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| 317 | }
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| 318 |
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| 319 | ptr += chunklen;
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| 320 | len -= chunklen;
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| 321 | }
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| 322 |
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| 323 | #ifndef CURL_DISABLE_HTTP
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| 324 | /* HTTP header, but not status-line */
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| 325 | if((conn->handler->protocol & PROTO_FAMILY_HTTP) &&
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| 326 | (type & CLIENTWRITE_HEADER) && !(type & CLIENTWRITE_STATUS) ) {
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| 327 | unsigned char htype = (unsigned char)
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| 328 | (type & CLIENTWRITE_CONNECT ? CURLH_CONNECT :
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| 329 | (type & CLIENTWRITE_1XX ? CURLH_1XX :
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| 330 | (type & CLIENTWRITE_TRAILER ? CURLH_TRAILER :
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| 331 | CURLH_HEADER)));
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| 332 | CURLcode result = Curl_headers_push(data, optr, htype);
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| 333 | if(result)
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| 334 | return result;
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| 335 | }
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| 336 | #endif
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| 337 |
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| 338 | if(writeheader) {
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| 339 | size_t wrote;
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| 340 |
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| 341 | Curl_set_in_callback(data, true);
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| 342 | wrote = writeheader(optr, 1, olen, data->set.writeheader);
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| 343 | Curl_set_in_callback(data, false);
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| 344 |
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| 345 | if(CURL_WRITEFUNC_PAUSE == wrote)
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| 346 | /* here we pass in the HEADER bit only since if this was body as well
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| 347 | then it was passed already and clearly that didn't trigger the
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| 348 | pause, so this is saved for later with the HEADER bit only */
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| 349 | return pausewrite(data, CLIENTWRITE_HEADER |
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| 350 | (type & (CLIENTWRITE_STATUS|CLIENTWRITE_CONNECT|
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| 351 | CLIENTWRITE_1XX|CLIENTWRITE_TRAILER)),
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| 352 | optr, olen);
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| 353 | if(wrote != olen) {
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| 354 | failf(data, "Failed writing header");
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| 355 | return CURLE_WRITE_ERROR;
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| 356 | }
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| 357 | }
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| 358 |
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| 359 | return CURLE_OK;
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| 360 | }
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| 361 |
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| 362 |
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| 363 | /* Curl_client_write() sends data to the write callback(s)
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| 364 |
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| 365 | The bit pattern defines to what "streams" to write to. Body and/or header.
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| 366 | The defines are in sendf.h of course.
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| 367 |
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| 368 | If CURL_DO_LINEEND_CONV is enabled, data is converted IN PLACE to the
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| 369 | local character encoding. This is a problem and should be changed in
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| 370 | the future to leave the original data alone.
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| 371 | */
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| 372 | CURLcode Curl_client_write(struct Curl_easy *data,
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| 373 | int type,
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| 374 | char *ptr,
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| 375 | size_t len)
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| 376 | {
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| 377 | #if !defined(CURL_DISABLE_FTP) && defined(CURL_DO_LINEEND_CONV)
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| 378 | /* FTP data may need conversion. */
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| 379 | if((type & CLIENTWRITE_BODY) &&
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| 380 | (data->conn->handler->protocol & PROTO_FAMILY_FTP) &&
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| 381 | data->conn->proto.ftpc.transfertype == 'A') {
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| 382 | /* convert end-of-line markers */
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| 383 | len = convert_lineends(data, ptr, len);
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| 384 | }
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| 385 | #endif
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| 386 | return chop_write(data, type, ptr, len);
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| 387 | }
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| 388 |
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| 389 | /*
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| 390 | * Internal read-from-socket function. This is meant to deal with plain
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| 391 | * sockets, SSL sockets and kerberos sockets.
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| 392 | *
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| 393 | * Returns a regular CURLcode value.
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| 394 | */
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| 395 | CURLcode Curl_read(struct Curl_easy *data, /* transfer */
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| 396 | curl_socket_t sockfd, /* read from this socket */
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| 397 | char *buf, /* store read data here */
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| 398 | size_t sizerequested, /* max amount to read */
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| 399 | ssize_t *n) /* amount bytes read */
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| 400 | {
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| 401 | CURLcode result = CURLE_RECV_ERROR;
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| 402 | ssize_t nread = 0;
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| 403 | size_t bytesfromsocket = 0;
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| 404 | char *buffertofill = NULL;
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| 405 | struct connectdata *conn = data->conn;
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| 406 |
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| 407 | /* Set 'num' to 0 or 1, depending on which socket that has been sent here.
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| 408 | If it is the second socket, we set num to 1. Otherwise to 0. This lets
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| 409 | us use the correct ssl handle. */
|
|---|
| 410 | int num = (sockfd == conn->sock[SECONDARYSOCKET]);
|
|---|
| 411 |
|
|---|
| 412 | *n = 0; /* reset amount to zero */
|
|---|
| 413 |
|
|---|
| 414 | bytesfromsocket = CURLMIN(sizerequested, (size_t)data->set.buffer_size);
|
|---|
| 415 | buffertofill = buf;
|
|---|
| 416 |
|
|---|
| 417 | nread = conn->recv[num](data, num, buffertofill, bytesfromsocket, &result);
|
|---|
| 418 | if(nread < 0)
|
|---|
| 419 | goto out;
|
|---|
| 420 |
|
|---|
| 421 | *n += nread;
|
|---|
| 422 | result = CURLE_OK;
|
|---|
| 423 | out:
|
|---|
| 424 | /* DEBUGF(infof(data, "Curl_read(handle=%p) -> %d, nread=%ld",
|
|---|
| 425 | data, result, nread)); */
|
|---|
| 426 | return result;
|
|---|
| 427 | }
|
|---|
| 428 |
|
|---|
