aboutsummaryrefslogtreecommitdiff
path: root/lib/cookie.c
blob: 47ed95254a958fdf9a7c0c895d15b630e97a4864 (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
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2004, 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.
 *
 * $Id$
 ***************************************************************************/

/***


RECEIVING COOKIE INFORMATION
============================

struct CookieInfo *cookie_init(char *file);

	Inits a cookie struct to store data in a local file. This is always
	called before any cookies are set.

int cookies_set(struct CookieInfo *cookie, char *cookie_line);

	The 'cookie_line' parameter is a full "Set-cookie:" line as
	received from a server.

	The function need to replace previously stored lines that this new
	line superceeds.

	It may remove lines that are expired.

	It should return an indication of success/error.


SENDING COOKIE INFORMATION
==========================

struct Cookies *cookie_getlist(struct CookieInfo *cookie,
                               char *host, char *path, bool secure);

	For a given host and path, return a linked list of cookies that
	the client should send to the server if used now. The secure
	boolean informs the cookie if a secure connection is achieved or
	not.

	It shall only return cookies that haven't expired.


Example set of cookies:

    Set-cookie: PRODUCTINFO=webxpress; domain=.fidelity.com; path=/; secure
    Set-cookie: PERSONALIZE=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
    domain=.fidelity.com; path=/ftgw; secure
    Set-cookie: FidHist=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
    domain=.fidelity.com; path=/; secure
    Set-cookie: FidOrder=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
    domain=.fidelity.com; path=/; secure
    Set-cookie: DisPend=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
    domain=.fidelity.com; path=/; secure
    Set-cookie: FidDis=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
    domain=.fidelity.com; path=/; secure
    Set-cookie:
    Session_Key@6791a9e0-901a-11d0-a1c8-9b012c88aa77=none;expires=Monday,
    13-Jun-1988 03:04:55 GMT; domain=.fidelity.com; path=/; secure
****/


#include "setup.h"

#ifndef CURL_DISABLE_HTTP

#include <stdlib.h>
#include <string.h>

#include "urldata.h"
#include "cookie.h"
#include "strequal.h"
#include "strtok.h"
#include "sendf.h"
#include "memory.h"

/* The last #include file should be: */
#ifdef CURLDEBUG
#include "memdebug.h"
#endif

#define my_isspace(x) ((x == ' ') || (x == '\t'))

static void freecookie(struct Cookie *co)
{
  if(co->expirestr)
    free(co->expirestr);
  if(co->domain)
    free(co->domain);
  if(co->path)
    free(co->path);
  if(co->name)
    free(co->name);
  if(co->value)
    free(co->value);

  free(co);
}

static bool tailmatch(const char *little, const char *bigone)
{
  size_t littlelen = strlen(little);
  size_t biglen = strlen(bigone);

  if(littlelen > biglen)
    return FALSE;

  return (bool)strequal(little, bigone+biglen-littlelen);
}

/****************************************************************************
 *
 * Curl_cookie_add()
 *
 * Add a single cookie line to the cookie keeping object.
 *
 ***************************************************************************/

struct Cookie *
Curl_cookie_add(struct SessionHandle *data,
                /* The 'data' pointer here may be NULL at times, and thus
                   must only be used very carefully for things that can deal
                   with data being NULL. Such as infof() and similar */

                struct CookieInfo *c,
                bool httpheader, /* TRUE if HTTP header-style line */
                char *lineptr,   /* first character of the line */
                char *domain,    /* default domain */
                char *path)      /* full path used when this cookie is set,
                                    used to get default path for the cookie
                                    unless set */
{
  struct Cookie *clist;
  char *what;
  char name[MAX_NAME];
  char *ptr;
  char *semiptr;
  struct Cookie *co;
  struct Cookie *lastc=NULL;
  time_t now = time(NULL);
  bool replace_old = FALSE;
  bool badcookie = FALSE; /* cookies are good by default. mmmmm yummy */

  /* First, alloc and init a new struct for it */
  co = (struct Cookie *)calloc(sizeof(struct Cookie), 1);
  if(!co)
    return NULL; /* bail out if we're this low on memory */

  if(httpheader) {
    /* This line was read off a HTTP-header */
    char *sep;

    what = malloc(MAX_COOKIE_LINE);
    if(!what) {
      free(co);
      return NULL;
    }

    semiptr=strchr(lineptr, ';'); /* first, find a semicolon */

    while(*lineptr && my_isspace(*lineptr))
      lineptr++;

    ptr = lineptr;
    do {
      /* we have a <what>=<this> pair or a 'secure' word here */
      sep = strchr(ptr, '=');
      if(sep && (!semiptr || (semiptr>sep)) ) {
        /*
         * There is a = sign and if there was a semicolon too, which make sure
         * that the semicolon comes _after_ the equal sign.
         */

        name[0]=what[0]=0; /* init the buffers */
        if(1 <= sscanf(ptr, "%" MAX_NAME_TXT "[^;=]=%"
                       MAX_COOKIE_LINE_TXT "[^;\r\n]",
                       name, what)) {
          /* this is a <name>=<what> pair */

          char *whatptr;

          /* Strip off trailing whitespace from the 'what' */
          size_t len=strlen(what);
          while(len && my_isspace(what[len-1])) {
            what[len-1]=0;
            len--;
          }

          /* Skip leading whitespace from the 'what' */
          whatptr=what;
          while(my_isspace(*whatptr)) {
            whatptr++;
          }

          if(strequal("path", name)) {
            co->path=strdup(whatptr);
            if(!co->path) {
              badcookie = TRUE; /* out of memory bad */
              break;
            }
          }
          else if(strequal("domain", name)) {
            /* note that this name may or may not have a preceeding dot, but
               we don't care about that, we treat the names the same anyway */

            const char *domptr=whatptr;
            int dotcount=1;

            /* Count the dots, we need to make sure that there are enough
               of them. */

            if('.' == whatptr[0])
              /* don't count the initial dot, assume it */
              domptr++;

            do {
              domptr = strchr(domptr, '.');
              if(domptr) {
                domptr++;
                dotcount++;
              }
            } while(domptr);

            /* The original Netscape cookie spec defined that this domain name
               MUST have three dots (or two if one of the seven holy TLDs),
               but it seems that these kinds of cookies are in use "out there"
               so we cannot be that strict. I've therefore lowered the check
               to not allow less than two dots. */

            if(dotcount < 2) {
              /* Received and skipped a cookie with a domain using too few
                 dots. */
              badcookie=TRUE; /* mark this as a bad cookie */
              infof(data, "skipped cookie with illegal dotcount domain: %s\n",
                    whatptr);
            }
            else {
              /* Now, we make sure that our host is within the given domain,
                 or the given domain is not valid and thus cannot be set. */

              if('.' == whatptr[0])
                whatptr++; /* ignore preceeding dot */

              if(!domain || tailmatch(whatptr, domain)) {
                const char *tailptr=whatptr;
                if(tailptr[0] == '.')
                  tailptr++;
                co->domain=strdup(tailptr); /* don't prefix w/dots
                                               internally */
                if(!co->domain) {
                  badcookie = TRUE;
                  break;
                }
                co->tailmatch=TRUE; /* we always do that if the domain name was
                                       given */
              }
              else {
                /* we did not get a tailmatch and then the attempted set domain
                   is not a domain to which the current host belongs. Mark as
                   bad. */
                badcookie=TRUE;
                infof(data, "skipped cookie with bad tailmatch domain: %s\n",
                      whatptr);
              }
            }
          }
          else if(strequal("version", name)) {
            co->version=strdup(whatptr);
            if(!co->version) {
              badcookie = TRUE;
              break;
            }
          }
          else if(strequal("max-age", name)) {
            /* Defined in RFC2109:

               Optional.  The Max-Age attribute defines the lifetime of the
               cookie, in seconds.  The delta-seconds value is a decimal non-
               negative integer.  After delta-seconds seconds elapse, the
               client should discard the cookie.  A value of zero means the
               cookie should be discarded immediately.

             */
            co->maxage = strdup(whatptr);
            if(!co->maxage) {
              badcookie = TRUE;
              break;
            }
            co->expires =
              atoi((*co->maxage=='\"')?&co->maxage[1]:&co->maxage[0]) + now;
          }
          else if(strequal("expires", name)) {
            co->expirestr=strdup(whatptr);
            if(!co->expirestr) {
              badcookie = TRUE;
              break;
            }
            co->expires = curl_getdate(what, &now);
          }
          else if(!co->name) {
            co->name = strdup(name);
            co->value = strdup(whatptr);
            if(!co->name || !co->value) {
              badcookie = TRUE;
              break;
            }
          }
          /*
            else this is the second (or more) name we don't know
            about! */
        }
        else {
          /* this is an "illegal" <what>=<this> pair */
        }
      }
      else {
        if(sscanf(ptr, "%" MAX_COOKIE_LINE_TXT "[^;\r\n]",
                  what)) {
          if(strequal("secure", what))
            co->secure = TRUE;
          /* else,
             unsupported keyword without assign! */

        }
      }
      if(!semiptr || !*semiptr) {
        /* we already know there are no more cookies */
        semiptr = NULL;
        continue;
      }

      ptr=semiptr+1;
      while(ptr && *ptr && my_isspace(*ptr))
        ptr++;
      semiptr=strchr(ptr, ';'); /* now, find the next semicolon */

      if(!semiptr && *ptr)
        /* There are no more semicolons, but there's a final name=value pair
           coming up */
        semiptr=strchr(ptr, '\0');
    } while(semiptr);

    if(!badcookie && !co->domain) {
      if(domain) {
        /* no domain was given in the header line, set the default */
        co->domain=strdup(domain);
        if(!co->domain)
          badcookie = TRUE;
      }
    }

    if(!badcookie && !co->path && path) {
      /* no path was given in the header line, set the default  */
      char *endslash = strrchr(path, '/');
      if(endslash) {
        size_t pathlen = endslash-path+1; /* include the ending slash */
        co->path=malloc(pathlen+1); /* one extra for the zero byte */
        if(co->path) {
          memcpy(co->path, path, pathlen);
          co->path[pathlen]=0; /* zero terminate */
        }
        else
          badcookie = TRUE;
      }
    }

    free(what);

    if(badcookie || !co->name) {
      /* we didn't get a cookie name or a bad one,
         this is an illegal line, bail out */
      freecookie(co);
      return NULL;
    }

  }
  else {
    /* This line is NOT a HTTP header style line, we do offer support for
       reading the odd netscape cookies-file format here */
    char *firstptr;
    char *tok_buf;
    int fields;

    if(lineptr[0]=='#') {
      /* don't even try the comments */
      free(co);
      return NULL;
    }
    /* strip off the possible end-of-line characters */
    ptr=strchr(lineptr, '\r');
    if(ptr)
      *ptr=0; /* clear it */
    ptr=strchr(lineptr, '\n');
    if(ptr)
      *ptr=0; /* clear it */

    firstptr=strtok_r(lineptr, "\t", &tok_buf); /* tokenize it on the TAB */

    /* Here's a quick check to eliminate normal HTTP-headers from this */
    if(!firstptr || strchr(firstptr, ':')) {
      free(co);
      return NULL;
    }

    /* Now loop through the fields and init the struct we already have
       allocated */
    for(ptr=firstptr, fields=0; ptr && !badcookie;
        ptr=strtok_r(NULL, "\t", &tok_buf), fields++) {
      switch(fields) {
      case 0:
        if(ptr[0]=='.') /* skip preceeding dots */
          ptr++;
        co->domain = strdup(ptr);
        if(!co->domain)
          badcookie = TRUE;
        break;
      case 1:
        /* This field got its explanation on the 23rd of May 2001 by
           Andrés García:

           flag: A TRUE/FALSE value indicating if all machines within a given
           domain can access the variable. This value is set automatically by
           the browser, depending on the value you set for the domain.

           As far as I can see, it is set to true when the cookie says
           .domain.com and to false when the domain is complete www.domain.com
        */
        co->tailmatch=(bool)strequal(ptr, "TRUE"); /* store information */
        break;
      case 2:
        /* It turns out, that sometimes the file format allows the path
           field to remain not filled in, we try to detect this and work
           around it! Andrés García made us aware of this... */
        if (strcmp("TRUE", ptr) && strcmp("FALSE", ptr)) {
          /* only if the path doesn't look like a boolean option! */
          co->path = strdup(ptr);
          if(!co->path)
            badcookie = TRUE;
          break;
        }
        /* this doesn't look like a path, make one up! */
        co->path = strdup("/");
        if(!co->path)
          badcookie = TRUE;
        fields++; /* add a field and fall down to secure */
        /* FALLTHROUGH */
      case 3:
        co->secure = (bool)strequal(ptr, "TRUE");
        break;
      case 4:
        co->expires = atoi(ptr);
        break;
      case 5:
        co->name = strdup(ptr);
        if(!co->name)
          badcookie = TRUE;
        break;
      case 6:
        co->value = strdup(ptr);
        if(!co->value)
          badcookie = TRUE;
        break;
      }
    }
    if(6 == fields) {
      /* we got a cookie with blank contents, fix it */
      co->value = strdup("");
      if(!co->value)
        badcookie = TRUE;
      else
        fields++;
    }

    if(!badcookie && (7 != fields))
      /* we did not find the sufficient number of fields */
      badcookie = TRUE;

    if(badcookie) {
      freecookie(co);
      return NULL;
    }

  }

  if(!c->running &&    /* read from a file */
     c->newsession &&  /* clean session cookies */
     !co->expires) {   /* this is a session cookie since it doesn't expire! */
    freecookie(co);
    return NULL;
  }

  co->livecookie = c->running;

  /* now, we have parsed the incoming line, we must now check if this
     superceeds an already existing cookie, which it may if the previous have
     the same domain and path as this */

  clist = c->cookies;
  replace_old = FALSE;
  while(clist) {
    if(strequal(clist->name, co->name)) {
      /* the names are identical */

      if(clist->domain && co->domain) {
        if(strequal(clist->domain, co->domain))
          /* The domains are identical */
          replace_old=TRUE;
      }
      else if(!clist->domain && !co->domain)
        replace_old = TRUE;

      if(replace_old) {
        /* the domains were identical */

        if(clist->path && co->path) {
          if(strequal(clist->path, co->path)) {
            replace_old = TRUE;
          }
          else
            replace_old = FALSE;
        }
        else if(!clist->path && !co->path)
          replace_old = TRUE;
        else
          replace_old = FALSE;

      }

      if(replace_old && !co->livecookie && clist->livecookie) {
        /* Both cookies matched fine, except that the already present
           cookie is "live", which means it was set from a header, while
           the new one isn't "live" and thus only read from a file. We let
           live cookies stay alive */

        /* Free the newcomer and get out of here! */
        freecookie(co);
        return NULL;
      }

      if(replace_old) {
        co->next = clist->next; /* get the next-pointer first */

        /* then free all the old pointers */
        if(clist->name)
          free(clist->name);
        if(clist->value)
          free(clist->value);
        if(clist->domain)
          free(clist->domain);
        if(clist->path)
          free(clist->path);
        if(clist->expirestr)
          free(clist->expirestr);

        if(clist->version)
          free(clist->version);
        if(clist->maxage)
          free(clist->maxage);

        *clist = *co;  /* then store all the new data */

        free(co);   /* free the newly alloced memory */
        co = clist; /* point to the previous struct instead */

        /* We have replaced a cookie, now skip the rest of the list but
           make sure the 'lastc' pointer is properly set */
        do {
          lastc = clist;
          clist = clist->next;
        } while(clist);
        break;
      }
    }
    lastc = clist;
    clist = clist->next;
  }

  if(c->running)
    /* Only show this when NOT reading the cookies from a file */
    infof(data, "%s cookie %s=\"%s\" for domain %s, path %s, expire %d\n",
          replace_old?"Replaced":"Added", co->name, co->value,
          co->domain, co->path, co->expires);

  if(!replace_old) {
    /* then make the last item point on this new one */
    if(lastc)
      lastc->next = co;
    else
      c->cookies = co;
  }

  c->numcookies++; /* one more cookie in the jar */
  return co;
}

/*****************************************************************************
 *
 * Curl_cookie_init()
 *
 * Inits a cookie struct to read data from a local file. This is always
 * called before any cookies are set. File may be NULL.
 *
 * If 'newsession' is TRUE, discard all "session cookies" on read from file.
 *
 ****************************************************************************/
struct CookieInfo *Curl_cookie_init(struct SessionHandle *data,
                                    char *file,
                                    struct CookieInfo *inc,
                                    bool newsession)
{
  struct CookieInfo *c;
  FILE *fp;
  bool fromfile=TRUE;

  if(NULL == inc) {
    /* we didn't get a struct, create one */
    c = (struct CookieInfo *)calloc(1, sizeof(struct CookieInfo));
    if(!c)
      return NULL; /* failed to get memory */
    c->filename = strdup(file?file:"none"); /* copy the name just in case */
  }
  else {
    /* we got an already existing one, use that */
    c = inc;
  }
  c->running = FALSE; /* this is not running, this is init */

  if(file && strequal(file, "-")) {
    fp = stdin;
    fromfile=FALSE;
  }
  else
    fp = file?fopen(file, "r"):NULL;

  c->newsession = newsession; /* new session? */

  if(fp) {
    char *lineptr;
    bool headerline;

    char *line = (char *)malloc(MAX_COOKIE_LINE);
    if(line) {
      while(fgets(line, MAX_COOKIE_LINE, fp)) {
        if(checkprefix("Set-Cookie:", line)) {
          /* This is a cookie line, get it! */
          lineptr=&line[11];
          headerline=TRUE;
        }
        else {
          lineptr=line;
          headerline=FALSE;
        }
        while(*lineptr && my_isspace(*lineptr))
          lineptr++;

        Curl_cookie_add(data, c, headerline, lineptr, NULL, NULL);
      }
      free(line); /* free the line buffer */
    }
    if(fromfile)
      fclose(fp);
  }

  c->running = TRUE;          /* now, we're running */

  return c;
}

/*****************************************************************************
 *
 * Curl_cookie_getlist()
 *
 * For a given host and path, return a linked list of cookies that the
 * client should send to the server if used now. The secure boolean informs
 * the cookie if a secure connection is achieved or not.
 *
 * It shall only return cookies that haven't expired.
 *
 ****************************************************************************/

struct Cookie *Curl_cookie_getlist(struct CookieInfo *c,
                                   char *host, char *path, bool secure)
{
   struct Cookie *newco;
   struct Cookie *co;
   time_t now = time(NULL);
   struct Cookie *mainco=NULL;

   if(!c || !c->cookies)
      return NULL; /* no cookie struct or no cookies in the struct */

   co = c->cookies;

   while(co) {
     /* only process this cookie if it is not expired or had no expire
        date AND that if the cookie requires we're secure we must only
        continue if we are! */
     if( (co->expires<=0 || (co->expires> now)) &&
         (co->secure?secure:TRUE) ) {

       /* now check if the domain is correct */
       if(!co->domain ||
          (co->tailmatch && tailmatch(co->domain, host)) ||
          (!co->tailmatch && strequal(host, co->domain)) ) {
         /* the right part of the host matches the domain stuff in the
            cookie data */

         /* now check the left part of the path with the cookies path
            requirement */
         if(!co->path ||
            checkprefix(co->path, path) ) {

           /* and now, we know this is a match and we should create an
              entry for the return-linked-list */

           newco = (struct Cookie *)malloc(sizeof(struct Cookie));
           if(newco) {
             /* first, copy the whole source cookie: */
             memcpy(newco, co, sizeof(struct Cookie));

             /* then modify our next */
             newco->next = mainco;

             /* point the main to us */
             mainco = newco;
           }
           else {
              /* failure, clear up the allocated chain and return NULL */
             while(mainco) {
               co = mainco->next;
               free(mainco);
               mainco = co;
             }

             return NULL;
           }
         }
       }
     }
     co = co->next;
   }

   return mainco; /* return the new list */
}


/*****************************************************************************
 *
 * Curl_cookie_freelist()
 *
 * Free a list of cookies previously returned by Curl_cookie_getlist();
 *
 ****************************************************************************/

void Curl_cookie_freelist(struct Cookie *co)
{
   struct Cookie *next;
   if(co) {
      while(co) {
	 next = co->next;
	 free(co); /* we only free the struct since the "members" are all
		      just copied! */
	 co = next;
      }
   }
}

/*****************************************************************************
 *
 * Curl_cookie_cleanup()
 *
 * Free a "cookie object" previous created with cookie_init().
 *
 ****************************************************************************/
void Curl_cookie_cleanup(struct CookieInfo *c)
{
   struct Cookie *co;
   struct Cookie *next;
   if(c) {
      if(c->filename)
	 free(c->filename);
      co = c->cookies;

      while(co) {
	 next = co->next;
         freecookie(co);
	 co = next;
      }
      free(c); /* free the base struct as well */
   }
}

/*
 * Curl_cookie_output()
 *
 * Writes all internally known cookies to the specified file. Specify
 * "-" as file name to write to stdout.
 *
 * The function returns non-zero on write failure.
 */
int Curl_cookie_output(struct CookieInfo *c, char *dumphere)
{
  struct Cookie *co;
  FILE *out;
  bool use_stdout=FALSE;

  if((NULL == c) || (0 == c->numcookies))
    /* If there are no known cookies, we don't write or even create any
       destination file */
    return 0;

  if(strequal("-", dumphere)) {
    /* use stdout */
    out = stdout;
    use_stdout=TRUE;
  }
  else {
    out = fopen(dumphere, "w");
    if(!out)
      return 1; /* failure */
  }

  if(c) {
    fputs("# Netscape HTTP Cookie File\n"
          "# http://www.netscape.com/newsref/std/cookie_spec.html\n"
          "# This file was generated by libcurl! Edit at your own risk.\n\n",
          out);
    co = c->cookies;

    while(co) {
      fprintf(out,
              "%s%s\t" /* domain */
              "%s\t" /* tailmatch */
              "%s\t" /* path */
              "%s\t" /* secure */
              "%u\t" /* expires */
              "%s\t" /* name */
              "%s\n", /* value */

              /* Make sure all domains are prefixed with a dot if they allow
                 tailmatching. This is Mozilla-style. */
              (co->tailmatch && co->domain && co->domain[0] != '.')? ".":"",
              co->domain?co->domain:"unknown",
              co->tailmatch?"TRUE":"FALSE",
              co->path?co->path:"/",
              co->secure?"TRUE":"FALSE",
              (unsigned int)co->expires,
              co->name,
              co->value?co->value:"");

      co=co->next;
    }
  }

  if(!use_stdout)
    fclose(out);

  return 0;
}

#endif /* CURL_DISABLE_HTTP */