url.c

      /* Unless we have asked to tunnel ftp operations through the proxy, we
         switch and use HTTP operations only */
      conn->curl_do = Curl_http;
      conn->curl_done = Curl_http_done;
      conn->curl_close = Curl_http_close;
    }
    else {
      conn->curl_do = Curl_ftp;
      conn->curl_done = Curl_ftp_done;
      conn->curl_connect = Curl_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 = Curl_telnet;
    conn->curl_done = Curl_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 = Curl_dict;
    conn->curl_done = Curl_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 = Curl_ldap;
    conn->curl_done = Curl_ldap_done;
  }
  else if (strequal(conn->proto, "FILE")) {
    conn->protocol |= PROT_FILE;

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

    result = Curl_Transfer(conn, -1, -1, FALSE, NULL, /* no download */
                      -1, NULL); /* no upload */

    return CURLE_OK;
  }
  else {
    /* We fell through all checks and thus we don't support the specified
       protocol */
    failf(data, "Unsupported protocol: %s", conn->proto);
    return CURLE_UNSUPPORTED_PROTOCOL;
  }

  /*************************************************************
   * .netrc scanning coming up
   *************************************************************/
  if(data->bits.use_netrc) {
    if(Curl_parsenetrc(data->hostname, data->user, data->passwd)) {
      infof(data, "Couldn't find host %s in the .netrc file, using defaults",
            data->hostname);
    }
    else
      data->bits.user_passwd = 1; /* enable user+password */

    /* 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])
      strcpy(data->passwd, CURL_DEFAULT_PASSWORD);
  }
  else if(!(data->bits.user_passwd) &&
	  (conn->protocol & (PROT_FTP|PROT_HTTP)) ) {
    /* This is a FTP or HTTP URL, and we haven't got the user+password in
     * the extra parameter, we will now try to extract the possible
     * user+password pair in a string like:
     * ftp://user:password@ftp.my.site:8021/README */
    char *ptr=NULL; /* assign to remove possible warnings */
    if((ptr=strchr(conn->name, '@'))) {
      /* there's a user+password given here, to the left of the @ */

      data->user[0] =0;
      data->passwd[0]=0;

      if(*conn->name != ':') {
        /* the name is given, get user+password */
        sscanf(conn->name, "%127[^:@]:%127[^@]",
               data->user, data->passwd);
      }
      else
        /* no name given, get the password only */
        sscanf(conn->name+1, "%127[^@]", data->passwd);

      if(data->user[0]) {
        char *newname=curl_unescape(data->user, 0);
        if(strlen(newname) < sizeof(data->user)) {
          strcpy(data->user, newname);
        }
        /* if the new name is longer than accepted, then just use
           the unconverted name, it'll be wrong but what the heck */
        free(newname);
      }

      /* check for password, if no ask for one */
      if( !data->passwd[0] ) {
        if(!data->fpasswd ||
           data->fpasswd(data->passwd_client,
                         "password:",data->passwd,sizeof(data->passwd)))
          return CURLE_BAD_PASSWORD_ENTERED;
      }
      else {
        /* we have a password found in the URL, decode it! */
        char *newpasswd=curl_unescape(data->passwd, 0);
        if(strlen(newpasswd) < sizeof(data->passwd)) {
          strcpy(data->passwd, newpasswd);
        }
        free(newpasswd);
      }

      conn->name = ++ptr;
      data->bits.user_passwd=1; /* enable user+password */
    }
    else {
      strcpy(data->user, CURL_DEFAULT_USER);
      strcpy(data->passwd, CURL_DEFAULT_PASSWORD);
    }
  }

  /*************************************************************
   * Figure out the remote port number
   *
   * No matter if we use a proxy or not, we have to figure out the remote
   * port number of various reasons.
   *
   * To be able to detect port number flawlessly, we must not confuse them
   * IPv6-specified addresses in the [0::1] style.
   *************************************************************/

  if((1 == sscanf(conn->name, "[%*39[0-9a-fA-F:]%c", &endbracket)) &&
     (']' == endbracket)) {
    /* this is a IPv6-style specified IP-address */
#ifndef ENABLE_IPV6
    failf(data, "You haven't enabled IPv6 support");
    return CURLE_URL_MALFORMAT;
#else
    tmp = strchr(conn->name, ']');

    tmp++; /* pass the ending bracket */
    if(':' != *tmp)
      tmp = NULL; /* no port number available */
#endif
  }
  else {
    /* traditional IPv4-style port-extracting */
    tmp = strchr(conn->name, ':');
  }

  if (tmp) {
    *tmp++ = '\0'; /* cut off the name there */
    data->remote_port = atoi(tmp);
  }

  /*************************************************************
   * Resolve the name of the server or proxy
   *************************************************************/
  if(!data->bits.httpproxy) {
    /* If not connecting via a proxy, extract the port from the URL, if it is
     * there, thus overriding any defaults that might have been set above. */
    data->port =  data->remote_port; /* it is the same port */

    /* Connect to target host right on */
#ifdef ENABLE_IPV6
    conn->res = Curl_getaddrinfo(data, conn->name, data->port);
    if(!conn->res)
#else
    conn->hp = Curl_gethost(data, conn->name, &conn->hostent_buf);
    if(!conn->hp)
#endif
    {
      failf(data, "Couldn't resolve host '%s'", conn->name);
      return CURLE_COULDNT_RESOLVE_HOST;
    }
  }
  else {
#ifdef ENABLE_IPV6
    failf(data, "proxy yet to be supported");
    return CURLE_OUT_OF_MEMORY;
#else
    char *prox_portno;
    char *endofprot;

    /* We need to make a duplicate of the proxy so that we can modify the
       string safely. */
    char *proxydup=strdup(data->proxy);

    /* We use 'proxyptr' to point to the proxy name from now on... */
    char *proxyptr=proxydup;

    if(NULL == proxydup) {
      failf(data, "memory shortage");
      return CURLE_OUT_OF_MEMORY;
    }

    /* Daniel Dec 10, 1998:
       We do the proxy host string parsing here. We want the host name and the
       port name. Accept a protocol:// prefix, even though it should just be
       ignored. */

    /* 1. skip the protocol part if present */
    endofprot=strstr(proxyptr, "://");
    if(endofprot) {
      proxyptr = endofprot+3;
    }

    /* allow user to specify proxy.server.com:1080 if desired */
    prox_portno = strchr (proxyptr, ':');
    if (prox_portno) {
      *prox_portno = 0x0; /* cut off number from host name */
      prox_portno ++;
      /* now set the local port number */
      data->port = atoi(prox_portno);
    }
    else if(data->proxyport) {
      /* None given in the proxy string, then get the default one if it is
         given */
      data->port = data->proxyport;
    }

    /* connect to proxy */
    conn->hp = Curl_gethost(data, proxyptr, &conn->hostent_buf);
    if(!conn->hp) {
      failf(data, "Couldn't resolve proxy '%s'", proxyptr);
      return CURLE_COULDNT_RESOLVE_PROXY;
    }

    free(proxydup); /* free the duplicate pointer and not the modified */
#endif
  }
  Curl_pgrsTime(data, TIMER_NAMELOOKUP);

#ifndef ENABLE_IPV6
  data->firstsocket = socket(AF_INET, SOCK_STREAM, 0);

  memset((char *) &conn->serv_addr, '\0', sizeof(conn->serv_addr));
  memcpy((char *)&(conn->serv_addr.sin_addr),
         conn->hp->h_addr, conn->hp->h_length);
  conn->serv_addr.sin_family = conn->hp->h_addrtype;
  conn->serv_addr.sin_port = htons(data->port);
#endif

#if !defined(WIN32)||defined(__CYGWIN32__)
  /* We don't generally like checking for OS-versions, we should make this
     HAVE_XXXX based, although at the moment I don't have a decent test for
     this! */

#ifdef HAVE_INET_NTOA

#ifndef INADDR_NONE
#define INADDR_NONE (unsigned long) ~0
#endif

#ifndef ENABLE_IPV6
  /*************************************************************
   * Select device to bind socket to
   *************************************************************/
  if (data->device && (strlen(data->device)<255)) {
    struct sockaddr_in sa;
    struct hostent *h=NULL;
    char *hostdataptr=NULL;
    size_t size;
    char myhost[256] = "";
    unsigned long in;

    if(Curl_if2ip(data->device, myhost, sizeof(myhost))) {
      h = Curl_gethost(data, myhost, &hostdataptr);
    }
    else {
      if(strlen(data->device)>1) {
        h = Curl_gethost(data, data->device, &hostdataptr);
      }
      if(h) {
        /* we know data->device is shorter than the myhost array */
        strcpy(myhost, data->device);
      }
    }

    if(! *myhost) {
      /* need to fix this
         h=Curl_gethost(data,
         getmyhost(*myhost,sizeof(myhost)),
         hostent_buf,
         sizeof(hostent_buf));
      */
      printf("in here\n");
    }

    infof(data, "We connect from %s\n", myhost);

    if ( (in=inet_addr(myhost)) != INADDR_NONE ) {

      if ( h ) {
        memset((char *)&sa, 0, sizeof(sa));
        memcpy((char *)&sa.sin_addr,
               h->h_addr,
               h->h_length);
        sa.sin_family = AF_INET;
        sa.sin_addr.s_addr = in;
        sa.sin_port = 0; /* get any port */
	
        if( bind(data->firstsocket, (struct sockaddr *)&sa, sizeof(sa)) >= 0) {
          /* we succeeded to bind */
          struct sockaddr_in add;
	
          size = sizeof(add);
          if(getsockname(data->firstsocket, (struct sockaddr *) &add,
                         (int *)&size)<0) {
            failf(data, "getsockname() failed");
            return CURLE_HTTP_PORT_FAILED;
          }
        }
        else {
          switch(errno) {
          case EBADF:
            failf(data, "Invalid descriptor: %d", errno);
            break;
          case EINVAL:
            failf(data, "Invalid request: %d", errno);
            break;
          case EACCES:
            failf(data, "Address is protected, user not superuser: %d", errno);
            break;
          case ENOTSOCK:
            failf(data,
                  "Argument is a descriptor for a file, not a socket: %d",
                  errno);
            break;
          case EFAULT:
            failf(data, "Inaccessable memory error: %d", errno);
            break;
          case ENAMETOOLONG:
            failf(data, "Address too long: %d", errno);
            break;
          case ENOMEM:
            failf(data, "Insufficient kernel memory was available: %d", errno);
            break;
          default:
            failf(data,"errno %d\n");
          } /* end of switch */
	
          return CURLE_HTTP_PORT_FAILED;
        } /* end of else */
	
      } /* end of if  h */
      else {
	failf(data,"could't find my own IP address (%s)", myhost);
	return CURLE_HTTP_PORT_FAILED;
      }
    } /* end of inet_addr */

    else {
      failf(data, "could't find my own IP address (%s)", myhost);
      return CURLE_HTTP_PORT_FAILED;
    }

    if(hostdataptr)
      free(hostdataptr); /* allocated by Curl_gethost() */

  } /* end of device selection support */
#endif  /* end of HAVE_INET_NTOA */
#endif /* end of not WIN32 */
#endif /*ENABLE_IPV6*/

  /*************************************************************
   * Connect to server/proxy
   *************************************************************/
#ifdef ENABLE_IPV6
  data->firstsocket = -1;
  for (ai = conn->res; ai; ai = ai->ai_next) {
    data->firstsocket = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
    if (data->firstsocket < 0)
      continue;

    if (connect(data->firstsocket, ai->ai_addr, ai->ai_addrlen) < 0) {
      close(data->firstsocket);
      data->firstsocket = -1;
      continue;
    }

    break;
  }
  if (data->firstsocket < 0) {
    failf(data, strerror(errno));
    return CURLE_COULDNT_CONNECT;
  }
#else
  if (connect(data->firstsocket,
              (struct sockaddr *) &(conn->serv_addr),
              sizeof(conn->serv_addr)
              ) < 0) {
    switch(errno) {
#ifdef ECONNREFUSED
      /* this should be made nicer */
    case ECONNREFUSED:
      failf(data, "Connection refused");
      break;
    case EFAULT:
      failf(data, "Invalid socket address: %d",errno);
      break;
    case EISCONN:
      failf(data, "Socket already connected: %d",errno);
      break;
    case ETIMEDOUT:
      failf(data, "Timeout while accepting connection, server busy: %d",errno);
      break;
    case ENETUNREACH:
      failf(data, "Network is unreachable: %d",errno);
      break;
    case EADDRINUSE:
      failf(data, "Local address already in use: %d",errno);
      break;
    case EINPROGRESS:
      failf(data, "Socket is nonblocking and connection can not be completed immediately: %d",errno);
      break;
    case EALREADY:
      failf(data, "Socket is nonblocking and a previous connection attempt not completed: %d",errno);
      break;
    case EAGAIN:
      failf(data, "No more free local ports: %d",errno);
      break;
    case EACCES:
    case EPERM:
      failf(data, "Attempt to connect to broadcast address without socket broadcast flag or local firewall rule violated: %d",errno);
      break;
#endif
    case EINTR:
      failf(data, "Connection timed out");
      break;
    default:
      failf(data, "Can't connect to server: %d", errno);
      break;
    }
    return CURLE_COULDNT_CONNECT;
  }
#endif

  /*************************************************************
   * Proxy authentication
   *************************************************************/
  if(data->bits.proxy_user_passwd) {
    char *authorization;
    snprintf(data->buffer, BUFSIZE, "%s:%s",
             data->proxyuser, data->proxypasswd);
    if(Curl_base64_encode(data->buffer, strlen(data->buffer),
                          &authorization) >= 0) {
      data->ptr_proxyuserpwd =
        aprintf("Proxy-authorization: Basic %s\015\012", authorization);
      free(authorization);
    }
  }

  /*************************************************************
   * Send user-agent to HTTP proxies even if the target protocol
   * isn't HTTP.
   *************************************************************/
  if((conn->protocol&PROT_HTTP) || data->bits.httpproxy) {
    if(data->useragent) {
      data->ptr_uagent =
        aprintf("User-Agent: %s\015\012", data->useragent);
    }
  }

  if(conn->curl_connect) {
    /* is there a connect() procedure? */

    /* set start time here for timeout purposes in the
     * connect procedure, it is later set again for the
     * progress meter purpose */
    conn->now = Curl_tvnow();

    /* Call the protocol-specific connect function */
    result = conn->curl_connect(conn);
    if(result != CURLE_OK)
      return result; /* pass back errors */
  }

  Curl_pgrsTime(data, TIMER_CONNECT); /* we're connected */

  conn->now = Curl_tvnow(); /* time this *after* the connect is done */
  conn->bytecount = 0;
  
  /* Figure out the ip-number and display the first host name it shows: */
#ifdef ENABLE_IPV6
  {
    char hbuf[NI_MAXHOST];
#ifdef NI_WITHSCOPEID
    const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
#else
    const int niflags = NI_NUMERICHOST;
#endif
    if (getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf, sizeof(hbuf), NULL, 0,
	niflags)) {
      snprintf(hbuf, sizeof(hbuf), "?");
    }
    if (ai->ai_canonname) {
      infof(data, "Connected to %s (%s)\n", ai->ai_canonname, hbuf);
    } else {
      infof(data, "Connected to %s\n", hbuf);
    }
  }
#else
  {
    struct in_addr in;
    (void) memcpy(&in.s_addr, *conn->hp->h_addr_list, sizeof (in.s_addr));
    infof(data, "Connected to %s (%s)\n", conn->hp->h_name, inet_ntoa(in));
  }
#endif

#ifdef __EMX__
  /* 20000330 mgs
   * the check is quite a hack...
   * we're calling _fsetmode to fix the problem with fwrite converting newline
   * characters (you get mangled text files, and corrupted binary files when
   * you download to stdout and redirect it to a file). */

  if ((data->out)->_handle == NULL) {
    _fsetmode(stdout, "b");
  }
#endif

  return CURLE_OK;
}

CURLcode curl_connect(CURL *curl, CURLconnect **in_connect)
{
  CURLcode code;
  struct connectdata *conn;

  /* call the stuff that needs to be called */
  code = _connect(curl, in_connect);

  if(CURLE_OK != code) {
    /* We're not allowed to return failure with memory left allocated
       in the connectdata struct, free those here */
    conn = (struct connectdata *)*in_connect;
    if(conn) {
      if(conn->path)
        free(conn->path);
#ifdef ENABLE_IPV6
      if(conn->res)
        freeaddrinfo(conn->res);
#else
      if(conn->hostent_buf)
        free(conn->hostent_buf);
#endif
      free(conn);
      *in_connect=NULL;
    }
  }
  return code;
}


/*
 * 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_done(CURLconnect *c_connect)
{
  struct connectdata *conn = c_connect;
  struct UrlData *data;
  CURLcode result;

  if(!conn || (conn->handle!= STRUCT_CONNECT)) {
    return CURLE_BAD_FUNCTION_ARGUMENT;
  }
  if(conn->state != CONN_DO) {
    /* This can only be called after a curl_do() */
    return CURLE_BAD_CALLING_ORDER;
  }
  data = conn->data;

  /* this calls the protocol-specific function pointer previously set */
  if(conn->curl_done)
    result = conn->curl_done(conn);
  else
    result = CURLE_OK;

  Curl_pgrsDone(data); /* done with the operation */

  conn->state = CONN_DONE;

  return result;
}

CURLcode curl_do(CURLconnect *in_conn)
{
  struct connectdata *conn = in_conn;
  CURLcode result;

  if(!conn || (conn->handle!= STRUCT_CONNECT)) {
    return CURLE_BAD_FUNCTION_ARGUMENT;
  }
  switch(conn->state) {
  case CONN_INIT:
  case CONN_DONE:
    /* these two states are OK */
    break;
  default:
    /* anything else is bad */
    return CURLE_BAD_CALLING_ORDER;
  }

  if(conn->curl_do) {
    /* generic protocol-specific function pointer set in curl_connect() */
    result = conn->curl_do(conn);
    if(result) {
      conn->state = CONN_ERROR;
      return result;
    }
  }

  conn->state = CONN_DO; /* we have entered this state */

  return CURLE_OK;
}