formdata.c

      }
    }
  }
  Curl_formclean(&data);
  return 0;
}

/*
 * curl_formfree() is an external function to free up a whole form post
 * chain
 */
void curl_formfree(struct curl_httppost *form)
{
  struct curl_httppost *next;

  if(!form)
    /* no form to free, just get out of this */
    return;

  do {
    next=form->next;  /* the following form line */

    /* recurse to sub-contents */
    if(form->more)
      curl_formfree(form->more);

    if( !(form->flags & HTTPPOST_PTRNAME) && form->name)
      free(form->name); /* free the name */
    if( !(form->flags & (HTTPPOST_PTRCONTENTS|HTTPPOST_CALLBACK)) &&
        form->contents)
      free(form->contents); /* free the contents */
    if(form->contenttype)
      free(form->contenttype); /* free the content type */
    if(form->showfilename)
      free(form->showfilename); /* free the faked file name */
    free(form);       /* free the struct */

  } while((form = next) != NULL); /* continue */
}

#ifndef HAVE_BASENAME
/*
  (Quote from The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2004
  Edition)

  The basename() function shall take the pathname pointed to by path and
  return a pointer to the final component of the pathname, deleting any
  trailing '/' characters.

  If the string pointed to by path consists entirely of the '/' character,
  basename() shall return a pointer to the string "/". If the string pointed
  to by path is exactly "//", it is implementation-defined whether '/' or "//"
  is returned.

  If path is a null pointer or points to an empty string, basename() shall
  return a pointer to the string ".".

  The basename() function may modify the string pointed to by path, and may
  return a pointer to static storage that may then be overwritten by a
  subsequent call to basename().

  The basename() function need not be reentrant. A function that is not
  required to be reentrant is not required to be thread-safe.

*/
static char *basename(char *path)
{
  /* Ignore all the details above for now and make a quick and simple
     implementaion here */
  char *s1;
  char *s2;

  s1=strrchr(path, '/');
  s2=strrchr(path, '\\');

  if(s1 && s2) {
    path = (s1 > s2? s1 : s2)+1;
  }
  else if(s1)
    path = s1 + 1;
  else if(s2)
    path = s2 + 1;

  return path;
}
#endif

static char *strippath(const char *fullfile)
{
  char *filename;
  char *base;
  filename = strdup(fullfile); /* duplicate since basename() may ruin the
                                  buffer it works on */
  if(!filename)
    return NULL;
  base = strdup(basename(filename));

  free(filename); /* free temporary buffer */

  return base; /* returns an allocated string! */
}

/*
 * Curl_getFormData() converts a linked list of "meta data" into a complete
 * (possibly huge) multipart formdata. The input list is in 'post', while the
 * output resulting linked lists gets stored in '*finalform'. *sizep will get
 * the total size of the whole POST.
 * A multipart/form_data content-type is built, unless a custom content-type
 * is passed in 'custom_content_type'.
 */

CURLcode Curl_getFormData(struct FormData **finalform,
                          struct curl_httppost *post,
                          const char *custom_content_type,
                          curl_off_t *sizep)
{
  struct FormData *form = NULL;
  struct FormData *firstform;
  struct curl_httppost *file;
  CURLcode result = CURLE_OK;

  curl_off_t size=0; /* support potentially ENORMOUS formposts */
  char *boundary;
  char *fileboundary=NULL;
  struct curl_slist* curList;

  *finalform=NULL; /* default form is empty */

  if(!post)
    return result; /* no input => no output! */

  boundary = Curl_FormBoundary();
  if(!boundary)
    return CURLE_OUT_OF_MEMORY;

  /* Make the first line of the output */
  result = AddFormDataf(&form, NULL,
                        "%s; boundary=%s\r\n",
                        custom_content_type?custom_content_type:
                        "Content-Type: multipart/form-data",
                        boundary);

  if(result) {
    free(boundary);
    return result;
  }
  /* we DO NOT include that line in the total size of the POST, since it'll be
     part of the header! */

  firstform = form;

  do {

    if(size) {
      result = AddFormDataf(&form, &size, "\r\n");
      if(result)
        break;
    }

    /* boundary */
    result = AddFormDataf(&form, &size, "--%s\r\n", boundary);
    if(result)
      break;

    /* Maybe later this should be disabled when a custom_content_type is
       passed, since Content-Disposition is not meaningful for all multipart
       types.
    */
    result = AddFormDataf(&form, &size,
                          "Content-Disposition: form-data; name=\"");
    if(result)
      break;

    result = AddFormData(&form, FORM_DATA, post->name, post->namelength,
                         &size);
    if(result)
      break;

    result = AddFormDataf(&form, &size, "\"");
    if(result)
      break;

    if(post->more) {
      /* If used, this is a link to more file names, we must then do
         the magic to include several files with the same field name */

      fileboundary = Curl_FormBoundary();

      result = AddFormDataf(&form, &size,
                            "\r\nContent-Type: multipart/mixed,"
                            " boundary=%s\r\n",
                            fileboundary);
      if(result)
        break;
    }

    file = post;

    do {

      /* If 'showfilename' is set, that is a faked name passed on to us
         to use to in the formpost. If that is not set, the actually used
         local file name should be added. */

      if(post->more) {
        /* if multiple-file */
        char *filebasename=
          (!file->showfilename)?strippath(file->contents):NULL;

        result = AddFormDataf(&form, &size,
                              "\r\n--%s\r\nContent-Disposition: "
                              "attachment; filename=\"%s\"",
                              fileboundary,
                              (file->showfilename?file->showfilename:
                               filebasename));
        if(filebasename)
          free(filebasename);
        if(result)
          break;
      }
      else if(post->flags & (HTTPPOST_FILENAME|HTTPPOST_BUFFER|
                             HTTPPOST_CALLBACK)) {
        /* it should be noted that for the HTTPPOST_FILENAME and
           HTTPPOST_CALLBACK cases the ->showfilename struct member is always
           assigned at this point */
        char *filebasename=
          (!post->showfilename)?strippath(post->contents):NULL;

        result = AddFormDataf(&form, &size,
                              "; filename=\"%s\"",
                              (post->showfilename?post->showfilename:
                               filebasename));
        if(filebasename)
          free(filebasename);

        if(result)
          break;
      }

      if(file->contenttype) {
        /* we have a specified type */
        result = AddFormDataf(&form, &size,
                              "\r\nContent-Type: %s",
                              file->contenttype);
        if(result)
          break;
      }

      curList = file->contentheader;
      while( curList ) {
        /* Process the additional headers specified for this form */
        result = AddFormDataf( &form, &size, "\r\n%s", curList->data );
        if(result)
          break;
        curList = curList->next;
      }
      if(result) {
        Curl_formclean(&firstform);
        free(boundary);
        return result;
      }

#if 0
      /* The header Content-Transfer-Encoding: seems to confuse some receivers
       * (like the built-in PHP engine). While I can't see any reason why it
       * should, I can just as well skip this to the benefit of the users who
       * are using such confused receivers.
       */

      if(file->contenttype &&
         !checkprefix("text/", file->contenttype)) {
        /* this is not a text content, mention our binary encoding */
        result = AddFormDataf(&form, &size,
                              "\r\nContent-Transfer-Encoding: binary");
        if(result)
          break;
      }
#endif

      result = AddFormDataf(&form, &size, "\r\n\r\n");
      if(result)
        break;

      if((post->flags & HTTPPOST_FILENAME) ||
         (post->flags & HTTPPOST_READFILE)) {
        /* we should include the contents from the specified file */
        FILE *fileread;

        fileread = strequal("-", file->contents)?
          stdin:fopen(file->contents, "rb"); /* binary read for win32  */

        /*
         * VMS: This only allows for stream files on VMS.  Stream files are
         * OK, as are FIXED & VAR files WITHOUT implied CC For implied CC,
         * every record needs to have a \n appended & 1 added to SIZE
         */

        if(fileread) {
          if(fileread != stdin) {
            /* close the file again */
            fclose(fileread);
            /* add the file name only - for later reading from this */
            result = AddFormData(&form, FORM_FILE, file->contents, 0, &size);
          }
          else {
            /* When uploading from stdin, we can't know the size of the file,
             * thus must read the full file as before. We *could* use chunked
             * transfer-encoding, but that only works for HTTP 1.1 and we
             * can't be sure we work with such a server.
             */
            size_t nread;
            char buffer[512];
            while((nread = fread(buffer, 1, sizeof(buffer), fileread)) != 0) {
              result = AddFormData(&form, FORM_CONTENT, buffer, nread, &size);
              if(result)
                break;
            }
          }

          if(result) {
            Curl_formclean(&firstform);
            free(boundary);
            return result;
          }

        }
        else {
#ifdef _FORM_DEBUG
          fprintf(stderr,
                  "\n==> Curl_getFormData couldn't open/read \"%s\"\n",
                  file->contents);
#endif
          Curl_formclean(&firstform);
          free(boundary);
          *finalform = NULL;
          return CURLE_READ_ERROR;
        }

      }
      else if(post->flags & HTTPPOST_BUFFER) {
        /* include contents of buffer */
        result = AddFormData(&form, FORM_CONTENT, post->buffer,
                             post->bufferlength, &size);
          if(result)
            break;
      }
      else if(post->flags & HTTPPOST_CALLBACK) {
        /* the contents should be read with the callback and the size
           is set with the contentslength */
        result = AddFormData(&form, FORM_CALLBACK, post->userp,
                             post->contentslength, &size);
        if(result)
          break;
      }
      else {
        /* include the contents we got */
        result = AddFormData(&form, FORM_CONTENT, post->contents,
                             post->contentslength, &size);
        if(result)
          break;
      }
    } while((file = file->more) != NULL); /* for each specified file for this field */
    if(result) {
      Curl_formclean(&firstform);
      free(boundary);
      return result;
    }

    if(post->more) {
      /* this was a multiple-file inclusion, make a termination file
         boundary: */
      result = AddFormDataf(&form, &size,
                           "\r\n--%s--",
                           fileboundary);
      free(fileboundary);
      if(result)
        break;
    }

  } while((post = post->next) != NULL); /* for each field */
  if(result) {
    Curl_formclean(&firstform);
    free(boundary);
    return result;
  }

  /* end-boundary for everything */
  result = AddFormDataf(&form, &size,
                       "\r\n--%s--\r\n",
                       boundary);
  if(result) {
    Curl_formclean(&firstform);
    free(boundary);
    return result;
  }

  *sizep = size;

  free(boundary);

  *finalform=firstform;

  return result;
}

/*
 * Curl_FormInit() inits the struct 'form' points to with the 'formdata'
 * and resets the 'sent' counter.
 */
int Curl_FormInit(struct Form *form, struct FormData *formdata )
{
  if(!formdata)
    return 1; /* error */

  form->data = formdata;
  form->sent = 0;
  form->fp = NULL;

  return 0;
}

static size_t readfromfile(struct Form *form, char *buffer,
                           size_t size)
{
  size_t nread;
  bool callback = (bool)(form->data->type == FORM_CALLBACK);

  if(callback)
    nread = form->fread_func(buffer, 1, size, form->data->line);
  else {
    if(!form->fp) {
      /* this file hasn't yet been opened */
      form->fp = fopen(form->data->line, "rb"); /* b is for binary */
      if(!form->fp)
        return (size_t)-1; /* failure */
    }
    nread = fread(buffer, 1, size, form->fp);
  }
  if(!nread || nread > size) {
    /* this is the last chunk from the file, move on */
    if(!callback) {
      fclose(form->fp);
      form->fp = NULL;
    }
    form->data = form->data->next;
  }

  return nread;
}

/*
 * Curl_FormReader() is the fread() emulation function that will be used to
 * deliver the formdata to the transfer loop and then sent away to the peer.
 */
size_t Curl_FormReader(char *buffer,
                       size_t size,
                       size_t nitems,
                       FILE *mydata)
{
  struct Form *form;
  size_t wantedsize;
  size_t gotsize = 0;

  form=(struct Form *)mydata;

  wantedsize = size * nitems;

  if(!form->data)
    return 0; /* nothing, error, empty */

  if((form->data->type == FORM_FILE) ||
     (form->data->type == FORM_CALLBACK)) {
    gotsize = readfromfile(form, buffer, wantedsize);

    if(gotsize)
      /* If positive or -1, return. If zero, continue! */
      return gotsize;
  }
  do {

    if( (form->data->length - form->sent ) > wantedsize - gotsize) {

      memcpy(buffer + gotsize , form->data->line + form->sent,
             wantedsize - gotsize);

      form->sent += wantedsize-gotsize;

      return wantedsize;
    }

    memcpy(buffer+gotsize,
           form->data->line + form->sent,
           (form->data->length - form->sent) );
    gotsize += form->data->length - form->sent;

    form->sent = 0;

    form->data = form->data->next; /* advance */

  } while(form->data && (form->data->type < FORM_CALLBACK));
  /* If we got an empty line and we have more data, we proceed to the next
     line immediately to avoid returning zero before we've reached the end. */

  return gotsize;
}

/*
 * Curl_formpostheader() returns the first line of the formpost, the
 * request-header part (which is not part of the request-body like the rest of
 * the post).
 */
char *Curl_formpostheader(void *formp, size_t *len)
{
  char *header;
  struct Form *form=(struct Form *)formp;

  if(!form->data)
    return 0; /* nothing, ERROR! */

  header = form->data->line;
  *len = form->data->length;

  form->data = form->data->next; /* advance */

  return header;
}


#ifdef _FORM_DEBUG
int FormAddTest(const char * errormsg,
                 struct curl_httppost **httppost,
                 struct curl_httppost **last_post,
                 ...)
{
  int result;
  va_list arg;
  va_start(arg, last_post);
  if((result = FormAdd(httppost, last_post, arg)))
    fprintf (stderr, "ERROR doing FormAdd ret: %d action: %s\n", result,
             errormsg);
  va_end(arg);
  return result;
}


int main(int argc, argv_item_t argv[])
{
  char name1[] = "simple_COPYCONTENTS";
  char name2[] = "COPYCONTENTS_+_CONTENTTYPE";
  char name3[] = "PTRNAME_+_NAMELENGTH_+_COPYNAME_+_CONTENTSLENGTH";
  char name4[] = "simple_PTRCONTENTS";
  char name5[] = "PTRCONTENTS_+_CONTENTSLENGTH";
  char name6[] = "PTRCONTENTS_+_CONTENTSLENGTH_+_CONTENTTYPE";
  char name7[] = "FILE1_+_CONTENTTYPE";
  char name8[] = "FILE1_+_FILE2";
  char name9[] = "FILE1_+_FILE2_+_FILE3";
  char name10[] = "ARRAY: FILE1_+_FILE2_+_FILE3";
  char name11[] = "FILECONTENT";
  char value1[] = "value for simple COPYCONTENTS";
  char value2[] = "value for COPYCONTENTS + CONTENTTYPE";
  char value3[] = "value for PTRNAME + NAMELENGTH + COPYNAME + CONTENTSLENGTH";
  char value4[] = "value for simple PTRCONTENTS";
  char value5[] = "value for PTRCONTENTS + CONTENTSLENGTH";
  char value6[] = "value for PTRCONTENTS + CONTENTSLENGTH + CONTENTTYPE";
  char value7[] = "inet_ntoa_r.h";
  char value8[] = "Makefile.b32";
  char type2[] = "image/gif";
  char type6[] = "text/plain";
  char type7[] = "text/html";
  int name3length = strlen(name3);
  int value3length = strlen(value3);
  int value5length = strlen(value5);
  int value6length = strlen(value6);
  int errors = 0;
  CURLcode rc;
  curl_off_t size;
  size_t nread;
  char buffer[4096];
  struct curl_httppost *httppost=NULL;
  struct curl_httppost *last_post=NULL;
  struct curl_forms forms[4];

  struct FormData *form;
  struct Form formread;

  (void) argc;
  (void) argv;

  if(FormAddTest("simple COPYCONTENTS test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name1, CURLFORM_COPYCONTENTS, value1,
                  CURLFORM_END))
    ++errors;
  if(FormAddTest("COPYCONTENTS  + CONTENTTYPE test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name2, CURLFORM_COPYCONTENTS, value2,
                  CURLFORM_CONTENTTYPE, type2, CURLFORM_END))
    ++errors;
  /* make null character at start to check that contentslength works
     correctly */
  name3[1] = '\0';
  value3[1] = '\0';
  if(FormAddTest("PTRNAME + NAMELENGTH + COPYNAME + CONTENTSLENGTH test",
                  &httppost, &last_post,
                  CURLFORM_PTRNAME, name3, CURLFORM_COPYCONTENTS, value3,
                  CURLFORM_CONTENTSLENGTH, value3length,
                  CURLFORM_NAMELENGTH, name3length, CURLFORM_END))
    ++errors;
  if(FormAddTest("simple PTRCONTENTS test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name4, CURLFORM_PTRCONTENTS, value4,
                  CURLFORM_END))
    ++errors;
  /* make null character at start to check that contentslength works
     correctly */
  value5[1] = '\0';
  if(FormAddTest("PTRCONTENTS + CONTENTSLENGTH test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name5, CURLFORM_PTRCONTENTS, value5,
                  CURLFORM_CONTENTSLENGTH, value5length, CURLFORM_END))
    ++errors;
  /* make null character at start to check that contentslength works
     correctly */
  value6[1] = '\0';
  if(FormAddTest("PTRCONTENTS + CONTENTSLENGTH + CONTENTTYPE test",
                  &httppost, &last_post,
                  CURLFORM_COPYNAME, name6, CURLFORM_PTRCONTENTS, value6,
                  CURLFORM_CONTENTSLENGTH, value6length,
                  CURLFORM_CONTENTTYPE, type6, CURLFORM_END))
    ++errors;
  if(FormAddTest("FILE + CONTENTTYPE test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name7, CURLFORM_FILE, value7,
                  CURLFORM_CONTENTTYPE, type7, CURLFORM_END))
    ++errors;
  if(FormAddTest("FILE1 + FILE2 test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name8, CURLFORM_FILE, value7,
                  CURLFORM_FILE, value8, CURLFORM_END))
    ++errors;
  if(FormAddTest("FILE1 + FILE2 + FILE3 test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name9, CURLFORM_FILE, value7,
                  CURLFORM_FILE, value8, CURLFORM_FILE, value7, CURLFORM_END))
    ++errors;
  forms[0].option = CURLFORM_FILE;
  forms[0].value  = value7;
  forms[1].option = CURLFORM_FILE;
  forms[1].value  = value8;
  forms[2].option = CURLFORM_FILE;
  forms[2].value  = value7;
  forms[3].option  = CURLFORM_END;
  if(FormAddTest("FILE1 + FILE2 + FILE3 ARRAY test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name10, CURLFORM_ARRAY, forms,
                  CURLFORM_END))
    ++errors;
  if(FormAddTest("FILECONTENT test", &httppost, &last_post,
                  CURLFORM_COPYNAME, name11, CURLFORM_FILECONTENT, value7,
                  CURLFORM_END))
    ++errors;

  rc = Curl_getFormData(&form, httppost, NULL, &size);
  if(rc != CURLE_OK) {
    if(rc != CURLE_READ_ERROR) {
      const char *errortext = curl_easy_strerror(rc);
      fprintf(stdout, "\n==> Curl_getFormData error: %s\n", errortext);
    }
    return 0;
  }

  Curl_FormInit(&formread, form);

  do {
    nread = Curl_FormReader(buffer, 1, sizeof(buffer),
                            (FILE *)&formread);

    if(nread < 1)
      break;
    fwrite(buffer, nread, 1, stdout);
  } while(1);

  fprintf(stdout, "size: ");
  fprintf(stdout, "%" FORMAT_OFF_T, size);
  fprintf(stdout, "\n");
  if(errors)
    fprintf(stdout, "\n==> %d Test(s) failed!\n", errors);
  else
    fprintf(stdout, "\nAll Tests seem to have worked (please check output)\n");

  return 0;
}

#endif  /* _FORM_DEBUG */

#else  /* CURL_DISABLE_HTTP */
CURLFORMcode curl_formadd(struct curl_httppost **httppost,
                          struct curl_httppost **last_post,
                          ...)
{
  (void)httppost;
  (void)last_post;
  return CURL_FORMADD_DISABLED;
}

int curl_formget(struct curl_httppost *form, void *arg,
                 curl_formget_callback append)
{
  (void) form;
  (void) arg;
  (void) append;
  return CURL_FORMADD_DISABLED;
}

void curl_formfree(struct curl_httppost *form)
{
  (void)form;
  /* does nothing HTTP is disabled */
}

#endif  /* CURL_DISABLE_HTTP */

#if !defined(CURL_DISABLE_HTTP) || defined(USE_SSLEAY)

/*
 * Curl_FormBoundary() creates a suitable boundary string and returns an
 * allocated one. This is also used by SSL-code so it must be present even
 * if HTTP is disabled!
 */
char *Curl_FormBoundary(void)
{
  char *retstring;
  static int randomizer;   /* this is just so that two boundaries within
                              the same form won't be identical */
  size_t i;

  static const char table16[]="abcdef0123456789";

  retstring = malloc(BOUNDARY_LENGTH+1);

  if(!retstring)
    return NULL; /* failed */

  srand((unsigned int)time(NULL)+randomizer++); /* seed */

  strcpy(retstring, "----------------------------");

  for(i=strlen(retstring); i<BOUNDARY_LENGTH; i++)
    retstring[i] = table16[rand()%16];

  /* 28 dashes and 12 hexadecimal digits makes 12^16 (184884258895036416)
     combinations */
  retstring[BOUNDARY_LENGTH]=0; /* zero terminate */

  return retstring;
}

#endif  /* !defined(CURL_DISABLE_HTTP) || defined(USE_SSLEAY) */