summaryrefslogtreecommitdiff
path: root/tests/server/getpart.c
blob: 56719f05bee987d1131dd23f387b4a08dd3b837e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2012, 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 http://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 SessionHandle {
  int fake;
};

#include "curl_base64.h"
#include "curl_memory.h"

/* include curl_memdebug.h last */
#include "curl_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(_MSC_VER) && defined(_DLL)
#  pragma warning(default:4232) /* MSVC extension, dllimport identity */
#endif

/*
 * 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, src_len;
  union {
    unsigned char *as_uchar;
             char *as_char;
  } buf64;

  src_len = strlen(src_buf);
  if(!src_len)
    return GPE_OK;

  buf64.as_char = NULL;

  if(src_b64) {
    /* base64 decode the given buffer */
    int error = (int) Curl_base64_decode(src_buf, &buf64.as_uchar, &src_len);
    if(error)
      return GPE_OUT_OF_MEMORY;
    src_buf = buf64.as_char;
    if(!src_len || !src_buf) {
      /*
      ** 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.
      */
      if(buf64.as_char)
        free(buf64.as_char);
      return GPE_OUT_OF_MEMORY;
    }
  }

  need_alloc = src_len + *dst_len + 1;

  /* enlarge destination buffer if required */
  if(need_alloc > *dst_alloc) {
    size_t newsize = need_alloc * 2;
    char *newptr = realloc(*dst_buf, newsize);
    if(!newptr) {
      if(buf64.as_char)
        free(buf64.as_char);
      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';

  if(buf64.as_char)
    free(buf64.as_char);

  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);
      if((len.sig = end - ptr) > 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;
          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;
          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);
      if((len.sig = end - ptr) > 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++;
      if((len.sig = end - ptr) > 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 */

  if(buffer)
    free(buffer);

  if(error != GPE_OK) {
    if(error == GPE_END_OF_FILE)
      error = GPE_OK;
    else {
      if(*outbuf)
        free(*outbuf);
      *outbuf = NULL;
      *outlen = 0;
    }
  }

  return error;
}