1 /*

     2  *    Copyright 2006 Intel Corporation

     3  * 

     4  *    Licensed under the Apache License, Version 2.0 (the "License");

     5  *    you may not use this file except in compliance with the License.

     6  *    You may obtain a copy of the License at

     7  * 

     8  *        http://www.apache.org/licenses/LICENSE-2.0

     9  * 

    10  *    Unless required by applicable law or agreed to in writing, software

    11  *    distributed under the License is distributed on an "AS IS" BASIS,

    12  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    13  *    See the License for the specific language governing permissions and

    14  *    limitations under the License.

    15  */

    16 

    17 #ifdef HAVE_CONFIG_H

    18 #  include <dtn-config.h>

    19 #endif

    20 

    21 #include <oasys/io/NetUtils.h>

    22 #include "IPConvergenceLayerUtils.h"

    23 

    24 namespace dtn {

    25 

    26 /**

    27  * Parse a next hop address specification of the form

    28  * HOST[:PORT?].

    29  *

    30  * @return true if the conversion was successful, false

    31  */

    32 bool

    33 IPConvergenceLayerUtils::parse_nexthop(const char* logpath, const char* nexthop,

    34                                        in_addr_t* addr, u_int16_t* port)

    35 {

    36     const char* host;

    37     std::string tmp;

    38                         

    39     *addr = INADDR_NONE;

    40     *port = 0;

    41 

    42     // first see if there's a colon in the string -- if so, it should

    43     // separate the hostname and port, if not, then the whole string

    44     // should be a hostname.

    45     //

    46     // note that it is invalid to have more than one colon in the

    47     // string, as caught by the check after calling strtoul

    48     const char* colon = strchr(nexthop, ':');

    49     if (colon != NULL) {

    50         char* endstr;

    51         u_int32_t portval = strtoul(colon + 1, &endstr, 10);

    52         

    53         if (*endstr != '\0' || portval > 65535) {

    54             log_warn_p(logpath, "invalid port %s in next hop '%s'",

    55                        colon + 1, nexthop);

    56             return false;

    57         }

    58 

    59         *port = (u_int16_t)portval;

    60         

    61         tmp.assign(nexthop, colon - nexthop);

    62         host = tmp.c_str();

    63     } else {

    64         host = nexthop;

    65     }

    66 

    67     // now look up the hostname

    68     if (oasys::gethostbyname(host, addr) != 0) {

    69         log_warn_p(logpath, "invalid hostname '%s' in next hop %s",

    70                    host, nexthop);

    71         return false;

    72     }

    73     

    74     return true;

    75 }

    76     

    77 

    78 } // namespace dtn