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curl/tests/server/getpart.c

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