483 lines
13 KiB
C
483 lines
13 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "server_setup.h"
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#include "getpart.h"
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#define ENABLE_CURLX_PRINTF
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/* make the curlx header define all printf() functions to use the curlx_*
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versions instead */
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#include "curlx.h" /* from the private lib dir */
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/* just to please curl_base64.h we create a fake struct */
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struct Curl_easy {
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int fake;
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};
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#include "curl_base64.h"
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#include "curl_memory.h"
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/* include memdebug.h last */
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#include "memdebug.h"
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#define EAT_SPACE(p) while(*(p) && ISSPACE(*(p))) (p)++
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#define EAT_WORD(p) while(*(p) && !ISSPACE(*(p)) && ('>' != *(p))) (p)++
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#ifdef DEBUG_GETPART
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#define show(x) printf x
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#else
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#define show(x) Curl_nop_stmt
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#endif
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#if defined(_MSC_VER) && defined(_DLL)
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# pragma warning(disable:4232) /* MSVC extension, dllimport identity */
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#endif
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curl_malloc_callback Curl_cmalloc = (curl_malloc_callback)malloc;
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curl_free_callback Curl_cfree = (curl_free_callback)free;
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curl_realloc_callback Curl_crealloc = (curl_realloc_callback)realloc;
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curl_strdup_callback Curl_cstrdup = (curl_strdup_callback)strdup;
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curl_calloc_callback Curl_ccalloc = (curl_calloc_callback)calloc;
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#if defined(WIN32) && defined(UNICODE)
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curl_wcsdup_callback Curl_cwcsdup = (curl_wcsdup_callback)_wcsdup;
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#endif
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#if defined(_MSC_VER) && defined(_DLL)
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# pragma warning(default:4232) /* MSVC extension, dllimport identity */
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#endif
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/*
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* Curl_convert_clone() returns a malloced copy of the source string (if
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* returning CURLE_OK), with the data converted to network format. This
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* function is used by base64 code in libcurl built to support data
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* conversion. This is a DUMMY VERSION that returns data unmodified - for
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* use by the test server only.
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*/
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CURLcode Curl_convert_clone(struct Curl_easy *data,
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const char *indata,
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size_t insize,
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char **outbuf);
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CURLcode Curl_convert_clone(struct Curl_easy *data,
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const char *indata,
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size_t insize,
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char **outbuf)
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{
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char *convbuf;
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(void)data;
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convbuf = malloc(insize);
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if(!convbuf)
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return CURLE_OUT_OF_MEMORY;
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memcpy(convbuf, indata, insize);
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*outbuf = convbuf;
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return CURLE_OK;
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}
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/*
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* readline()
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*
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* Reads a complete line from a file into a dynamically allocated buffer.
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*
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* Calling function may call this multiple times with same 'buffer'
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* and 'bufsize' pointers to avoid multiple buffer allocations. Buffer
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* will be reallocated and 'bufsize' increased until whole line fits in
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* buffer before returning it.
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*
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* Calling function is responsible to free allocated buffer.
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*
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* This function may return:
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* GPE_OUT_OF_MEMORY
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* GPE_END_OF_FILE
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* GPE_OK
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*/
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static int readline(char **buffer, size_t *bufsize, FILE *stream)
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{
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size_t offset = 0;
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char *newptr;
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if(!*buffer) {
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*buffer = malloc(128);
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if(!*buffer)
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return GPE_OUT_OF_MEMORY;
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*bufsize = 128;
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}
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for(;;) {
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size_t length;
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int bytestoread = curlx_uztosi(*bufsize - offset);
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if(!fgets(*buffer + offset, bytestoread, stream))
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return (offset != 0) ? GPE_OK : GPE_END_OF_FILE;
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length = offset + strlen(*buffer + offset);
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if(*(*buffer + length - 1) == '\n')
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break;
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offset = length;
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if(length < *bufsize - 1)
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continue;
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newptr = realloc(*buffer, *bufsize * 2);
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if(!newptr)
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return GPE_OUT_OF_MEMORY;
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*buffer = newptr;
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*bufsize *= 2;
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}
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return GPE_OK;
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}
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/*
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* appenddata()
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*
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* This appends data from a given source buffer to the end of the used part of
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* a destination buffer. Arguments relative to the destination buffer are, the
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* address of a pointer to the destination buffer 'dst_buf', the length of data
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* in destination buffer excluding potential null string termination 'dst_len',
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* the allocated size of destination buffer 'dst_alloc'. All three destination
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* buffer arguments may be modified by this function. Arguments relative to the
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* source buffer are, a pointer to the source buffer 'src_buf' and indication
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* whether the source buffer is base64 encoded or not 'src_b64'.
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*
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* If the source buffer is indicated to be base64 encoded, this appends the
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* decoded data, binary or whatever, to the destination. The source buffer
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* may not hold binary data, only a null terminated string is valid content.
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*
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* Destination buffer will be enlarged and relocated as needed.
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*
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* Calling function is responsible to provide preallocated destination
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* buffer and also to deallocate it when no longer needed.
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*
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* This function may return:
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* GPE_OUT_OF_MEMORY
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* GPE_OK
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*/
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static int appenddata(char **dst_buf, /* dest buffer */
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size_t *dst_len, /* dest buffer data length */
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size_t *dst_alloc, /* dest buffer allocated size */
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char *src_buf, /* source buffer */
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int src_b64) /* != 0 if source is base64 encoded */
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{
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size_t need_alloc = 0;
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size_t src_len = strlen(src_buf);
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if(!src_len)
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return GPE_OK;
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need_alloc = src_len + *dst_len + 1;
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if(src_b64) {
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if(src_buf[src_len - 1] == '\r')
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src_len--;
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if(src_buf[src_len - 1] == '\n')
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src_len--;
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}
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/* enlarge destination buffer if required */
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if(need_alloc > *dst_alloc) {
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size_t newsize = need_alloc * 2;
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char *newptr = realloc(*dst_buf, newsize);
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if(!newptr) {
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return GPE_OUT_OF_MEMORY;
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}
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*dst_alloc = newsize;
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*dst_buf = newptr;
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}
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/* memcpy to support binary blobs */
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memcpy(*dst_buf + *dst_len, src_buf, src_len);
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*dst_len += src_len;
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*(*dst_buf + *dst_len) = '\0';
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return GPE_OK;
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}
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static int decodedata(char **buf, /* dest buffer */
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size_t *len) /* dest buffer data length */
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{
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CURLcode error = CURLE_OK;
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unsigned char *buf64 = NULL;
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size_t src_len = 0;
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if(!*len)
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return GPE_OK;
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/* base64 decode the given buffer */
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error = Curl_base64_decode(*buf, &buf64, &src_len);
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if(error)
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return GPE_OUT_OF_MEMORY;
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if(!src_len) {
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/*
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** currently there is no way to tell apart an OOM condition in
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** Curl_base64_decode() from zero length decoded data. For now,
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** let's just assume it is an OOM condition, currently we have
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** no input for this function that decodes to zero length data.
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*/
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free(buf64);
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return GPE_OUT_OF_MEMORY;
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}
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/* memcpy to support binary blobs */
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memcpy(*buf, buf64, src_len);
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*len = src_len;
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*(*buf + src_len) = '\0';
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free(buf64);
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return GPE_OK;
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}
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/*
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* getpart()
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*
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* This returns whole contents of specified XML-like section and subsection
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* from the given file. This is mostly used to retrieve a specific part from
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* a test definition file for consumption by test suite servers.
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*
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* Data is returned in a dynamically allocated buffer, a pointer to this data
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* and the size of the data is stored at the addresses that caller specifies.
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*
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* If the returned data is a string the returned size will be the length of
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* the string excluding null termination. Otherwise it will just be the size
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* of the returned binary data.
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*
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* Calling function is responsible to free returned buffer.
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*
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* This function may return:
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* GPE_NO_BUFFER_SPACE
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* GPE_OUT_OF_MEMORY
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* GPE_OK
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*/
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int getpart(char **outbuf, size_t *outlen,
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const char *main, const char *sub, FILE *stream)
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{
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# define MAX_TAG_LEN 79
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char couter[MAX_TAG_LEN + 1]; /* current outermost section */
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char cmain[MAX_TAG_LEN + 1]; /* current main section */
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char csub[MAX_TAG_LEN + 1]; /* current sub section */
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char ptag[MAX_TAG_LEN + 1]; /* potential tag */
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char patt[MAX_TAG_LEN + 1]; /* potential attributes */
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char *buffer = NULL;
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char *ptr;
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char *end;
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union {
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ssize_t sig;
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size_t uns;
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} len;
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size_t bufsize = 0;
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size_t outalloc = 256;
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int in_wanted_part = 0;
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int base64 = 0;
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int error;
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enum {
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STATE_OUTSIDE = 0,
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STATE_OUTER = 1,
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STATE_INMAIN = 2,
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STATE_INSUB = 3,
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STATE_ILLEGAL = 4
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} state = STATE_OUTSIDE;
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*outlen = 0;
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*outbuf = malloc(outalloc);
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if(!*outbuf)
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return GPE_OUT_OF_MEMORY;
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*(*outbuf) = '\0';
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couter[0] = cmain[0] = csub[0] = ptag[0] = patt[0] = '\0';
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while((error = readline(&buffer, &bufsize, stream)) == GPE_OK) {
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ptr = buffer;
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EAT_SPACE(ptr);
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if('<' != *ptr) {
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if(in_wanted_part) {
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show(("=> %s", buffer));
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error = appenddata(outbuf, outlen, &outalloc, buffer, base64);
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if(error)
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break;
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}
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continue;
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}
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ptr++;
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if('/' == *ptr) {
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/*
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** closing section tag
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*/
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ptr++;
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end = ptr;
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EAT_WORD(end);
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len.sig = end - ptr;
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if(len.sig > MAX_TAG_LEN) {
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error = GPE_NO_BUFFER_SPACE;
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break;
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}
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memcpy(ptag, ptr, len.uns);
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ptag[len.uns] = '\0';
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if((STATE_INSUB == state) && !strcmp(csub, ptag)) {
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/* end of current sub section */
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state = STATE_INMAIN;
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csub[0] = '\0';
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if(in_wanted_part) {
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/* end of wanted part */
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in_wanted_part = 0;
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/* Do we need to base64 decode the data? */
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if(base64) {
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error = decodedata(outbuf, outlen);
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if(error)
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return error;
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}
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break;
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}
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}
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else if((STATE_INMAIN == state) && !strcmp(cmain, ptag)) {
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/* end of current main section */
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state = STATE_OUTER;
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cmain[0] = '\0';
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if(in_wanted_part) {
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/* end of wanted part */
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in_wanted_part = 0;
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/* Do we need to base64 decode the data? */
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if(base64) {
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error = decodedata(outbuf, outlen);
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if(error)
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return error;
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}
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break;
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}
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}
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else if((STATE_OUTER == state) && !strcmp(couter, ptag)) {
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/* end of outermost file section */
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state = STATE_OUTSIDE;
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couter[0] = '\0';
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if(in_wanted_part) {
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/* end of wanted part */
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in_wanted_part = 0;
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break;
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}
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}
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}
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else if(!in_wanted_part) {
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/*
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** opening section tag
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*/
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/* get potential tag */
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end = ptr;
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EAT_WORD(end);
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len.sig = end - ptr;
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if(len.sig > MAX_TAG_LEN) {
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error = GPE_NO_BUFFER_SPACE;
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break;
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}
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memcpy(ptag, ptr, len.uns);
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ptag[len.uns] = '\0';
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/* ignore comments, doctypes and xml declarations */
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if(('!' == ptag[0]) || ('?' == ptag[0])) {
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show(("* ignoring (%s)", buffer));
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continue;
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}
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/* get all potential attributes */
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ptr = end;
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EAT_SPACE(ptr);
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end = ptr;
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while(*end && ('>' != *end))
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end++;
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len.sig = end - ptr;
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if(len.sig > MAX_TAG_LEN) {
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error = GPE_NO_BUFFER_SPACE;
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break;
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}
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memcpy(patt, ptr, len.uns);
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patt[len.uns] = '\0';
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if(STATE_OUTSIDE == state) {
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/* outermost element (<testcase>) */
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strcpy(couter, ptag);
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state = STATE_OUTER;
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continue;
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}
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else if(STATE_OUTER == state) {
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/* start of a main section */
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strcpy(cmain, ptag);
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state = STATE_INMAIN;
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continue;
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}
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else if(STATE_INMAIN == state) {
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/* start of a sub section */
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strcpy(csub, ptag);
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state = STATE_INSUB;
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if(!strcmp(cmain, main) && !strcmp(csub, sub)) {
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/* start of wanted part */
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in_wanted_part = 1;
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if(strstr(patt, "base64="))
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/* bit rough test, but "mostly" functional, */
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/* treat wanted part data as base64 encoded */
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base64 = 1;
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}
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continue;
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}
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}
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if(in_wanted_part) {
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show(("=> %s", buffer));
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error = appenddata(outbuf, outlen, &outalloc, buffer, base64);
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if(error)
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break;
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}
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} /* while */
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free(buffer);
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if(error != GPE_OK) {
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if(error == GPE_END_OF_FILE)
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error = GPE_OK;
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else {
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free(*outbuf);
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*outbuf = NULL;
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*outlen = 0;
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}
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}
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return error;
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}
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