url.c

/*****************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 *  The contents of this file are subject to the Mozilla Public License
 *  Version 1.0 (the "License"); you may not use this file except in
 *  compliance with the License. You may obtain a copy of the License at
 *  http://www.mozilla.org/MPL/
 *
 *  Software distributed under the License is distributed on an "AS IS"
 *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 *  License for the specific language governing rights and limitations
 *  under the License.
 *
 *  The Original Code is Curl.
 *
 *  The Initial Developer of the Original Code is Daniel Stenberg.
 *
 *  Portions created by the Initial Developer are Copyright (C) 1998.
 *  All Rights Reserved.
 *
 * ------------------------------------------------------------
 * Main author:
 * - Daniel Stenberg <Daniel.Stenberg@haxx.nu>
 *
 * 	http://curl.haxx.nu
 *
 * $Source$
 * $Revision$
 * $Date$
 * $Author$
 * $State$
 * $Locker$
 *
 * ------------------------------------------------------------
 ****************************************************************************/

/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>

#include "setup.h"

#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#include <winsock.h>
#include <time.h>
#include <io.h>
#else
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <netinet/in.h>
#include <sys/time.h>
#include <sys/resource.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <netdb.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#include <sys/ioctl.h>
#include <signal.h>

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#ifndef HAVE_VPRINTF
#error "We can't compile without vprintf() support!"
#endif
#ifndef HAVE_SELECT
#error "We can't compile without select() support!"
#endif
#ifndef HAVE_SOCKET
#error "We can't compile without socket() support!"
#endif

#endif

#include "urldata.h"
#include <curl/curl.h>
#include "netrc.h"

#include "formdata.h"
#include "getenv.h"
#include "base64.h"
#include "ssluse.h"
#include "hostip.h"
#include "if2ip.h"
#include "download.h"
#include "sendf.h"
#include "speedcheck.h"
#include "getpass.h"
#include "progress.h"
#include "cookie.h"
#include "strequal.h"
#include "writeout.h"

/* And now for the protocols */
#include "ftp.h"
#include "dict.h"
#include "telnet.h"
#include "http.h"
#include "file.h"
#include "ldap.h"

#include <curl/types.h>

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* -- -- */


CURLcode _urlget(struct UrlData *data);

/* does nothing, returns OK */
CURLcode curl_init(void)
{
  return CURLE_OK;
}

/* does nothing */
void curl_free(void)
{
}

void urlfree(struct UrlData *data, bool totally)
{
#ifdef USE_SSLEAY
  if (data->use_ssl) {
    if(data->ssl) {
      SSL_shutdown(data->ssl);
      SSL_set_connect_state(data->ssl);

      SSL_free (data->ssl);
      data->ssl = NULL;
    }
    if(data->ctx) {
      SSL_CTX_free (data->ctx);
      data->ctx = NULL;
    }
    data->use_ssl = FALSE; /* get back to ordinary socket usage */
  }
#endif /* USE_SSLEAY */

  /* close possibly still open sockets */
  if(-1 != data->secondarysocket) {
    sclose(data->secondarysocket);
    data->secondarysocket = -1;	
  }
  if(-1 != data->firstsocket) {
    sclose(data->firstsocket);
    data->firstsocket=-1;
  }


  if(data->ptr_proxyuserpwd) {
    free(data->ptr_proxyuserpwd);
    data->ptr_proxyuserpwd=NULL;
  }
  if(data->ptr_uagent) {
    free(data->ptr_uagent);
    data->ptr_uagent=NULL;
  }
  if(data->ptr_userpwd) {
    free(data->ptr_userpwd);
    data->ptr_userpwd=NULL;
  }
  if(data->ptr_rangeline) {
    free(data->ptr_rangeline);
    data->ptr_rangeline=NULL;
  }
  if(data->ptr_ref) {
    free(data->ptr_ref);
    data->ptr_ref=NULL;
  }
  if(data->ptr_cookie) {
    free(data->ptr_cookie);
    data->ptr_cookie=NULL;
  }
  if(data->ptr_host) {
    free(data->ptr_host);
    data->ptr_host=NULL;
  }

  if(totally) {
    /* we let the switch decide whether we're doing a part or total
       cleanup */

    /* check for allocated [URL] memory to free: */
    if(data->freethis)
      free(data->freethis);

    if(data->headerbuff)
      free(data->headerbuff);

    cookie_cleanup(data->cookies);

    free(data);

    /* global cleanup */
    curl_free();
  }
}

CURLcode curl_close(CURL *curl)
{
  struct UrlData *data=(struct UrlData *)curl;
  
  void *protocol = data->proto.generic;

  /* total session cleanup */
  urlfree(data, TRUE);

  if(protocol)
    free(protocol);

  free(data);

  return CURLE_OK;
}

CURLcode curl_open(CURL **curl, char *url)
{
  /* We don't yet support specifying the URL at this point */
  struct UrlData *data;

  /* Very simple start-up: alloc the struct, init it with zeroes and return */
  data = (struct UrlData *)malloc(sizeof(struct UrlData));
  if(data) {
    memset(data, 0, sizeof(struct UrlData));
    data->handle = STRUCT_OPEN;
    data->interf = CURLI_NORMAL; /* normal interface by default */

    /* We do some initial setup here, all those fields that can't be just 0 */

    data-> headerbuff=(char*)malloc(HEADERSIZE);
    if(!data->headerbuff) {
      free(data); /* free the memory again */
      return CURLE_OUT_OF_MEMORY;
    }

    data-> headersize=HEADERSIZE;

#if 0
    /* Let's set some default values: */
    curl_setopt(data, CURLOPT_FILE, stdout); /* default output to stdout */
    curl_setopt(data, CURLOPT_INFILE, stdin);  /* default input from stdin */
    curl_setopt(data, CURLOPT_STDERR, stderr);  /* default stderr to stderr! */
#endif

    data->out = stdout; /* default output to stdout */
    data->in  = stdin;  /* default input from stdin */
    data->err  = stderr;  /* default stderr to stderr */

    data->firstsocket = -1; /* no file descriptor */
    data->secondarysocket = -1; /* no file descriptor */

    /* use fwrite as default function to store output */
    data->fwrite = (size_t (*)(char *, size_t, size_t, FILE *))fwrite;

    /* use fread as default function to read input */
    data->fread = (size_t (*)(char *, size_t, size_t, FILE *))fread;

    data->infilesize = -1; /* we don't know any size */

    data->current_speed = -1; /* init to negative == impossible */

    *curl = data;
    return CURLE_OK;
  }

  /* this is a very serious error */
  return CURLE_OUT_OF_MEMORY;
}

CURLcode curl_setopt(CURL *curl, CURLoption option, ...)
{
  struct UrlData *data = curl;
  va_list param;
  char *cookiefile;

  va_start(param, option);

  switch(option) {
  case CURLOPT_VERBOSE:
    data->bits.verbose = va_arg(param, long);
    break;
  case CURLOPT_HEADER:
    data->bits.http_include_header = va_arg(param, long);
    break;
  case CURLOPT_NOPROGRESS:
    data->bits.hide_progress = va_arg(param, long);
    if(data->bits.hide_progress)
      data->progress.flags |= PGRS_HIDE;
    break;
  case CURLOPT_NOBODY:
    data->bits.no_body = va_arg(param, long);
    break;
  case CURLOPT_FAILONERROR:
    data->bits.http_fail_on_error = va_arg(param, long);
    break;
  case CURLOPT_UPLOAD:
    data->bits.upload = va_arg(param, long);
    break;
  case CURLOPT_POST:
    data->bits.http_post = va_arg(param, long);
    break;
  case CURLOPT_FTPLISTONLY:
    data->bits.ftp_list_only = va_arg(param, long);
    break;
  case CURLOPT_FTPAPPEND:
    data->bits.ftp_append = va_arg(param, long);
    break;
  case CURLOPT_NETRC:
    data->bits.use_netrc = va_arg(param, long);
    break;
  case CURLOPT_FOLLOWLOCATION:
    data->bits.http_follow_location = va_arg(param, long);
    break;
  case CURLOPT_FTPASCII:
    data->bits.ftp_ascii = va_arg(param, long);
    break;
  case CURLOPT_PUT:
    data->bits.http_put = va_arg(param, long);
    break;
  case CURLOPT_MUTE:
    data->bits.mute = va_arg(param, long);
    break;

  case CURLOPT_TIMECONDITION:
    data->timecondition = va_arg(param, long);
    break;

  case CURLOPT_TIMEVALUE:
    data->timevalue = va_arg(param, long);
    break;

  case CURLOPT_SSLVERSION:
    data->ssl_version = va_arg(param, long);
    break;

  case CURLOPT_COOKIEFILE:
    cookiefile = (char *)va_arg(param, void *);
    if(cookiefile) {
      data->cookies = cookie_init(cookiefile);
    }
    break;
  case CURLOPT_WRITEHEADER:
    data->writeheader = (FILE *)va_arg(param, FILE *);
    break;
  case CURLOPT_COOKIE:
    data->cookie = va_arg(param, char *);
    break;
  case CURLOPT_ERRORBUFFER:
    data->errorbuffer = va_arg(param, char *);
    break;
  case CURLOPT_FILE:
    data->out = va_arg(param, FILE *);
    break;
  case CURLOPT_FTPPORT:
    data->ftpport = va_arg(param, char *);
    data->bits.ftp_use_port = data->ftpport?1:0;
    break;
  case CURLOPT_HTTPHEADER:
    data->headers = va_arg(param, struct HttpHeader *);
    break;
  case CURLOPT_CUSTOMREQUEST:
    data->customrequest = va_arg(param, char *);
    break;
  case CURLOPT_HTTPPOST:
    data->httppost = va_arg(param, struct HttpPost *);
    data->bits.http_formpost = data->httppost?1:0;
    break;
  case CURLOPT_INFILE:
    data->in = va_arg(param, FILE *);
    break;
  case CURLOPT_INFILESIZE:
    data->infilesize = va_arg(param, long);
    break;
  case CURLOPT_LOW_SPEED_LIMIT:
    data->low_speed_limit=va_arg(param, long);
    break;
  case CURLOPT_LOW_SPEED_TIME:
    data->low_speed_time=va_arg(param, long);
    break;
  case CURLOPT_URL:
    data->url = va_arg(param, char *);
    break;
  case CURLOPT_PORT:
    /* this typecast is used to fool the compiler to NOT warn for a
       "cast from pointer to integer of different size" */
    data->port = (unsigned short)(va_arg(param, long));
    break;
  case CURLOPT_POSTFIELDS:
    data->postfields = va_arg(param, char *);
    break;
  case CURLOPT_PROGRESSMODE:
    data->progress.mode = va_arg(param, long);
    break;
  case CURLOPT_REFERER:
    data->referer = va_arg(param, char *);
    data->bits.http_set_referer = (data->referer && *data->referer)?1:0;
    break;
  case CURLOPT_PROXY:
    data->proxy = va_arg(param, char *);
    data->bits.httpproxy = data->proxy?1:0;
    break;
#if 0
  case CURLOPT_FLAGS:
    conf_to_internal(data, va_arg(param, long));
    break;
#endif
  case CURLOPT_TIMEOUT:
    data->timeout = va_arg(param, long);
    break;
  case CURLOPT_USERAGENT:
    data->useragent = va_arg(param, char *);
    break;
  case CURLOPT_USERPWD:
    data->userpwd = va_arg(param, char *);
    data->bits.user_passwd = data->userpwd?1:0;
    break;
  case CURLOPT_POSTQUOTE:
    data->postquote = va_arg(param, struct curl_slist *);
    break;
  case CURLOPT_PROXYUSERPWD:
    data->proxyuserpwd = va_arg(param, char *);
    data->bits.proxy_user_passwd = data->proxyuserpwd?1:0;
    break;
  case CURLOPT_RANGE:
    data->range = va_arg(param, char *);
    data->bits.set_range = data->range?1:0;
    break;
  case CURLOPT_RESUME_FROM:
    data->resume_from = va_arg(param, long);
    break;
  case CURLOPT_STDERR:
    data->err = va_arg(param, FILE *);
    break;
  case CURLOPT_WRITEFUNCTION:
    data->fwrite = va_arg(param, write_callback);
    break;
  case CURLOPT_WRITEINFO:
    data->writeinfo = va_arg(param, char *);
    break;
  case CURLOPT_READFUNCTION:
    data->fread = va_arg(param, read_callback);
    break;
  case CURLOPT_SSLCERT:
    data->cert = va_arg(param, char *);
    break;
  case CURLOPT_SSLCERTPASSWD:
    data->cert_passwd = va_arg(param, char *);
    break;
  case CURLOPT_CRLF:
    data->crlf = va_arg(param, long);
    break;
  case CURLOPT_QUOTE:
    data->quote = va_arg(param, struct curl_slist *);
    break;
  default:
    /* unknown tag and its companion, just ignore: */
    return CURLE_READ_ERROR; /* correct this */
  }
  return CURLE_OK;
}


/*
 * Read everything until a newline.
 */

int GetLine(int sockfd, char *buf, struct UrlData *data)
{
  int nread;
  int read_rc=1;
  char *ptr;
  ptr=buf;

  /* get us a full line, terminated with a newline */
  for(nread=0;
      (nread<BUFSIZE) && read_rc;
      nread++, ptr++) {
#ifdef USE_SSLEAY
    if (data->use_ssl) {
      read_rc = SSL_read(data->ssl, ptr, 1);
    }
    else {
#endif
      read_rc = sread(sockfd, ptr, 1);
#ifdef USE_SSLEAY
    }
#endif /* USE_SSLEAY */
    if (*ptr == '\n')
      break;
  }
  *ptr=0; /* zero terminate */

  if(data->bits.verbose) {
    fputs("< ", data->err);
    fwrite(buf, 1, nread, data->err);
    fputs("\n", data->err);
  }
  return nread;
}


#ifndef WIN32
#ifndef RETSIGTYPE
#define RETSIGTYPE void
#endif
RETSIGTYPE alarmfunc(int signal)
{
  /* this is for "-ansi -Wall -pedantic" to stop complaining!   (rabe) */
  (void)signal;
  return;
}
#endif

CURLcode curl_write(CURLconnect *c_conn, char *buf, size_t amount,
                   size_t *n)
{
  struct connectdata *conn = (struct connectdata *)c_conn;
  struct UrlData *data;
  size_t bytes_written;

  if(!n || !conn || (conn->handle != STRUCT_CONNECT))
    return CURLE_FAILED_INIT;
  data = conn->data;

#ifdef USE_SSLEAY
  if (data->use_ssl) {
    bytes_written = SSL_write(data->ssl, buf, amount);
  }
  else {
#endif
    bytes_written = swrite(conn->writesockfd, buf, amount);
#ifdef USE_SSLEAY
  }
#endif /* USE_SSLEAY */

  *n = bytes_written;
  return CURLE_OK;
}

CURLcode curl_read(CURLconnect *c_conn, char *buf, size_t buffersize,
                   size_t *n)
{
  struct connectdata *conn = (struct connectdata *)c_conn;
  struct UrlData *data;
  size_t nread;

  if(!n || !conn || (conn->handle != STRUCT_CONNECT))
    return CURLE_FAILED_INIT;
  data = conn->data;

#ifdef USE_SSLEAY
  if (data->use_ssl) {
    nread = SSL_read (data->ssl, buf, buffersize);
  }
  else {
#endif
    nread = sread (conn->sockfd, buf, buffersize);
#ifdef USE_SSLEAY
  }
#endif /* USE_SSLEAY */
  *n = nread;
  return CURLE_OK;
}

CURLcode curl_disconnect(CURLconnect *c_connect)
{
  struct connectdata *conn = c_connect;

  struct UrlData *data = conn->data;

  /* clean up the sockets and SSL stuff from the previous "round" */
  urlfree(data, FALSE);

  return CURLE_OK;
}

/*
 * NAME curl_connect()
 *
 * DESCRIPTION
 *
 * Connects to the peer server and performs the initial setup. This function
 * writes a connect handle to its second argument that is a unique handle for
 * this connect. This allows multiple connects from the same handle returned
 * by curl_open().
 *
 * EXAMPLE
 *
 * CURLCode result;
 * CURL curl;
 * CURLconnect connect;
 * result = curl_connect(curl, &connect);
 */

CURLcode curl_connect(CURL *curl, CURLconnect **in_connect)
{
  char *tmp;
  char *buf;
  CURLcode result;
  char resumerange[12]="";
  struct UrlData *data = curl;
  struct connectdata *conn;

  if(!data || (data->handle != STRUCT_OPEN))
    return CURLE_BAD_FUNCTION_ARGUMENT; /* TBD: make error codes */

  if(!data->url)
    return CURLE_URL_MALFORMAT;

  conn = (struct connectdata *)malloc(sizeof(struct connectdata));
  if(!conn) {
    *in_connect = NULL; /* clear the pointer */
    return CURLE_OUT_OF_MEMORY;
  }
  *in_connect = conn;

  memset(conn, 0, sizeof(struct connectdata));
  conn->handle = STRUCT_CONNECT;

  conn->data = data; /* remember our daddy */
  conn->state = CONN_INIT;

  buf = data->buffer; /* this is our buffer */

#if 0
  signal(SIGALRM, alarmfunc);
#endif

  /* Parse <url> */
  /* We need to parse the url, even when using the proxy, because
   * we will need the hostname and port in case we are trying
   * to SSL connect through the proxy -- and we don't know if we
   * will need to use SSL until we parse the url ...
   */
  if((2 == sscanf(data->url, "%64[^:]://%" URL_MAX_LENGTH_TXT "[^\n]",
                  conn->proto,
                  conn->path)) && strequal(conn->proto, "file")) {
    /* we deal with file://<host>/<path> differently since it
       supports no hostname other than "localhost" and "127.0.0.1",
       which is unique among the protocols specified in RFC 1738 */
    if (strnequal(conn->path, "localhost/", 10) ||
        strnequal(conn->path, "127.0.0.1/", 10))
      /* ... since coincidentally both host strings are of equal length
         otherwise, <host>/ is quietly ommitted */
      strcpy(conn->path, &conn->path[10]);

    strcpy(conn->proto, "file");
  }
  else {
    /* Set default host and default path */
    strcpy(conn->gname, "curl.haxx.nu");
    strcpy(conn->path, "/");

    if (2 > sscanf(data->url,
                   "%64[^\n:]://%256[^\n/]%" URL_MAX_LENGTH_TXT "[^\n]",
                   conn->proto, conn->gname, conn->path)) {
      
      /* badly formatted, let's try the browser-style _without_ 'http://' */
      if((1 > sscanf(data->url, "%256[^\n/]%" URL_MAX_LENGTH_TXT "[^\n]",
                     conn->gname, conn->path)) ) {
        failf(data, "<url> malformed");
        return CURLE_URL_MALFORMAT;
      }
      if(strnequal(conn->gname, "FTP", 3)) {
        strcpy(conn->proto, "ftp");
      }
      else if(strnequal(conn->gname, "GOPHER", 6))
        strcpy(conn->proto, "gopher");
#ifdef USE_SSLEAY
      else if(strnequal(conn->gname, "HTTPS", 5))
        strcpy(conn->proto, "https");
#endif /* USE_SSLEAY */
      else if(strnequal(conn->gname, "TELNET", 6))
        strcpy(conn->proto, "telnet");
      else if (strnequal(conn->gname, "DICT", sizeof("DICT")-1))
        strcpy(conn->proto, "DICT");
      else if (strnequal(conn->gname, "LDAP", sizeof("LDAP")-1))
        strcpy(conn->proto, "LDAP");
      else {
        strcpy(conn->proto, "http");
      }

      conn->protocol |= PROT_MISSING; /* not given in URL */
    }
  }


  if(data->bits.user_passwd && !data->bits.use_netrc) {
    if(':' != *data->userpwd) {
      if((1 <= sscanf(data->userpwd, "%127[^:]:%127s",
                      data->user, data->passwd))) {
        /* check for password, if no ask for one */
        if( !data->passwd[0] )
        {
          strncpy(data->passwd, getpass("password: "), sizeof(data->passwd));
        }
      }
    }
    if(!data->user[0]) {
      failf(data, "USER malformat: user name can't be zero length");
      return CURLE_MALFORMAT_USER;
    }
  }

  if(data->bits.proxy_user_passwd) {
    if(':' != *data->proxyuserpwd) {
      if((1 <= sscanf(data->proxyuserpwd, "%127[^:]:%127s",
                      data->proxyuser, data->proxypasswd))) {
        /* check for password, if no ask for one */
        if( !data->proxypasswd[0] )
        {
          strncpy(data->proxypasswd, getpass("proxy password: "), sizeof(data->proxypasswd));
        }
      }
    }
    if(!data->proxyuser[0]) {
      failf(data, " Proxy USER malformat: user name can't be zero length");
      return CURLE_MALFORMAT_USER;
    }
  }

  conn->name = conn->gname;
  conn->ppath = conn->path;
  data->hostname = conn->name;


  if(!data->bits.httpproxy) {
    /* If proxy was not specified, we check for default proxy environment
       variables, to enable i.e Lynx compliance:

       HTTP_PROXY http://some.server.dom:port/
       HTTPS_PROXY http://some.server.dom:port/
       FTP_PROXY http://some.server.dom:port/
       GOPHER_PROXY http://some.server.dom:port/
       NO_PROXY host.domain.dom  (a comma-separated list of hosts which should
       not be proxied, or an asterisk to override all proxy variables)
       ALL_PROXY seems to exist for the CERN www lib. Probably the first to
       check for.
 
       */
    char *no_proxy=GetEnv("NO_PROXY");
    char *proxy=NULL;
    char proxy_env[128];

    if(!no_proxy || !strequal("*", no_proxy)) {
      /* NO_PROXY wasn't specified or it wasn't just an asterisk */
      char *nope;

      nope=no_proxy?strtok(no_proxy, ", "):NULL;
      while(nope) {
        if(strlen(nope) <= strlen(conn->name)) {
          char *checkn=
            conn->name + strlen(conn->name) - strlen(nope);
          if(strnequal(nope, checkn, strlen(nope))) {
            /* no proxy for this host! */
            break;
          }
        }
	nope=strtok(NULL, ", ");
      }
      if(!nope) {
	/* It was not listed as without proxy */
	char *protop = conn->proto;
	char *envp = proxy_env;
	char *prox;

	/* Now, build <PROTOCOL>_PROXY and check for such a one to use */
	while(*protop) {
	  *envp++ = toupper(*protop++);
	}
	/* append _PROXY */
	strcpy(envp, "_PROXY");
#if 0
	infof(data, "DEBUG: checks the environment variable %s\n", proxy_env);
#endif
	/* read the protocol proxy: */
	prox=GetEnv(proxy_env);

	if(prox && *prox) { /* don't count "" strings */
	  proxy = prox; /* use this */
        }
        else
          proxy = GetEnv("ALL_PROXY"); /* default proxy to use */

        if(proxy && *proxy) {
          /* we have a proxy here to set */
          data->proxy = proxy;
          data->bits.httpproxy=1;
        }
      } /* if (!nope) - it wasn't specfied non-proxy */
    } /* NO_PROXY wasn't specified or '*' */
  } /* if not using proxy */

  if((conn->protocol&PROT_MISSING) && data->bits.httpproxy ) {
    /* We're guessing prefixes here and since we're told to use a proxy, we
       need to add the protocol prefix to the URL string before we continue!
       */
    char *reurl;

    reurl = maprintf("%s://%s", conn->proto, data->url);

    if(!reurl)
      return CURLE_OUT_OF_MEMORY;

    data->url = reurl;
    if(data->freethis)
      free(data->freethis);
    data->freethis = reurl;

    conn->protocol &= ~PROT_MISSING; /* switch that one off again */
  }

  /* RESUME on a HTTP page is a tricky business. First, let's just check that
     'range' isn't used, then set the range parameter and leave the resume as
     it is to inform about this situation for later use. We will then
     "attempt" to resume, and if we're talking to a HTTP/1.1 (or later)
     server, we will get the document resumed. If we talk to a HTTP/1.0
     server, we just fail since we can't rewind the file writing from within
     this function. */
  if(data->resume_from) {
    if(!data->bits.set_range) {
      /* if it already was in use, we just skip this */
      sprintf(resumerange, "%d-", data->resume_from);
      data->range=resumerange; /* tell ourselves to fetch this range */
      data->bits.set_range = 1; /* switch on range usage */
    }
  }


  if(data->timeout) {
    /* We set the timeout on the connection/resolving phase first, separately
       from the download/upload part to allow a maximum time on everything */
    myalarm(data->timeout); /* this sends a signal when the timeout fires
			       off, and that will abort system calls */
  }

  /*
   * Hmm, if we are using a proxy, then we can skip the GOPHER and the
   * FTP steps, although we cannot skip the HTTPS step (since the proxy
   * works differently, depending on whether its SSL or not).
   */

  if (strequal(conn->proto, "HTTP")) {
    if(!data->port)
      data->port = PORT_HTTP;
    data->remote_port = PORT_HTTP;
    conn->protocol |= PROT_HTTP;
    conn->curl_do = http;
    conn->curl_done = http_done;
  }
  else if (strequal(conn->proto, "HTTPS")) {
#ifdef USE_SSLEAY
    if(!data->port)
      data->port = PORT_HTTPS;
    data->remote_port = PORT_HTTPS;
    conn->protocol |= PROT_HTTP;
    conn->protocol |= PROT_HTTPS;

    conn->curl_do = http;
    conn->curl_done = http_done;
    conn->curl_connect = http_connect;

#else /* USE_SSLEAY */
    failf(data, "SSL is disabled, https: not supported!");
    return CURLE_UNSUPPORTED_PROTOCOL;
#endif /* !USE_SSLEAY */
  }
  else if (strequal(conn->proto, "GOPHER")) {
    if(!data->port)
      data->port = PORT_GOPHER;
    data->remote_port = PORT_GOPHER;
    /* Skip /<item-type>/ in path if present */
    if (isdigit((int)conn->path[1])) {
      conn->ppath = strchr(&conn->path[1], '/');
      if (conn->ppath == NULL)
	conn->ppath = conn->path;
      }
    conn->protocol |= PROT_GOPHER;
    conn->curl_do = http;
    conn->curl_done = http_done;
  }
  else if(strequal(conn->proto, "FTP")) {
    char *type;
    if(!data->port)
      data->port = PORT_FTP;
    data->remote_port = PORT_FTP;
    conn->protocol |= PROT_FTP;

    if(data->bits.httpproxy) {
      conn->curl_do = http;
      conn->curl_done = http_done;
    }
    else {
      conn->curl_do = ftp;
      conn->curl_done = ftp_done;
      conn->curl_connect = ftp_connect;
    }

    conn->ppath++; /* don't include the initial slash */

    /* FTP URLs support an extension like ";type=<typecode>" that
       we'll try to get now! */
    type=strstr(conn->ppath, ";type=");
    if(!type) {
      type=strstr(conn->gname, ";type=");
    }
    if(type) {
      char command;
      *type=0;
      command = toupper(type[6]);
      switch(command) {
      case 'A': /* ASCII mode */
	data->bits.ftp_ascii = 1;
	break;
      case 'D': /* directory mode */
	data->bits.ftp_list_only = 1;
	break;
      case 'I': /* binary mode */
      default:
	/* switch off ASCII */
	data->bits.ftp_ascii = 0;
	break;
      }
    }
  }
  else if(strequal(conn->proto, "TELNET")) {
    /* telnet testing factory */
    conn->protocol |= PROT_TELNET;
    if(!data->port)
      data->port = PORT_TELNET;
    data->remote_port = PORT_TELNET;

    conn->curl_do = telnet;
    conn->curl_done = telnet_done;

  }
  else if (strequal(conn->proto, "DICT")) {
    conn->protocol |= PROT_DICT;
    if(!data->port)
      data->port = PORT_DICT;
    data->remote_port = PORT_DICT;
    conn->curl_do = dict;
    conn->curl_done = dict_done;
  }
  else if (strequal(conn->proto, "LDAP")) {
    conn->protocol |= PROT_LDAP;
    if(!data->port)
      data->port = PORT_LDAP;
    data->remote_port = PORT_LDAP;
    conn->curl_do = ldap;
    conn->curl_done = ldap_done;
  }
  else if (strequal(conn->proto, "FILE")) {
    conn->protocol |= PROT_FILE;

    conn->curl_do = file;
    /* no done() function */
  }

  else {
    failf(data, "Unsupported protocol: %s", conn->proto);
    return CURLE_UNSUPPORTED_PROTOCOL;
  }

  if(data->bits.use_netrc) {
    if(ParseNetrc(data->hostname, data->user, data->passwd)) {
      infof(data, "Couldn't find host %s in the .netrc file, using defaults",
            data->hostname);
    }
    /* weather we failed or not, we don't know which fields that were filled
       in anyway */
    if(!data->user[0])
      strcpy(data->user, CURL_DEFAULT_USER);
    if(!data->passwd[0])