common/misc.cc

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// -*- C++ -*-  vim:tabstop=8 softtabstop=4
//
// misc.cc - These are functions that are generally useful to parts of
// the programs in the consmgr suite.  They aren't specific to any
// class, so are just located here as functions.
//
// ***** BEGIN LICENSE BLOCK *****
// Version: MPL 1.1/GPL 2.0/LGPL 2.1
// 
// The contents of this file are subject to the Mozilla Public License
// Version 1.1 (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 the consmgr network/serial-line monitoring package.
// 
// The Initial Developer of the Original Code is Chris P. Ross.
// Portions created by the Initial Developer are Copyright (C) 2000-2008
// the Initial Developer.  All Rights Reserved.
// 
// Contributor(s):
// 
// Alternatively, the contents of this file may be used under the terms of
// either the GNU General Public License Version 2 or later (the "GPL"), or
// the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
// in which case the provisions of the GPL or the LGPL are applicable instead
// of those above. If you wish to allow use of your version of this file only
// under the terms of either the GPL or the LGPL, and not to allow others to
// use your version of this file under the terms of the MPL, indicate your
// decision by deleting the provisions above and replace them with the notice
// and other provisions required by the GPL or the LGPL. If you do not delete
// the provisions above, a recipient may use your version of this file under
// the terms of any one of the MPL, the GPL or the LGPL.
// 
// ***** END LICENSE BLOCK *****

//
// Functions specific to consmgr.  Should this be some sort of
// member function of Config?  Perhaps so, at least for build_addr().
// Not for now, at least...
//

extern "C" {
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <signal.h>
};

#include <sstream>

#include "consmgr.h"
#include "cmconfig.h"
#include "message.h"
#include "outlet.h"

#if defined(__bsdi__) && (_BSDI_VERSION < 200100)
#define BROKEN_GETNAMEINFO
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif

struct sockaddr *
build_addr(Config &conf)
{
    // First, make sure a database entry has been loaded if
    // needed, and both host and port are specified for it.
    if ((conf.find("host") == conf.end()) ||
        (conf.find("port") == conf.end()))
        throw ConfigException("Configuration error.  Both 'host' and " \
            "'port' must be specified in the configuration entry.");

    // Allocate a sockaddr_storage to hold the address
    struct sockaddr             *sa = (struct sockaddr*)new struct sockaddr_storage;
    memset(sa, 0, sizeof(struct sockaddr_storage));
    // And pointers to refer to it in "the right way"...
    struct sockaddr_in          *sin = (struct sockaddr_in*)sa;
#ifdef  INET6
    struct sockaddr_in6         *sin6 = (struct sockaddr_in6*)sa;
#endif

    try {
        // XXX - Should I validate the returned host?
#ifndef BROKEN_GETNAMEINFO
        const string    host(conf["host"]);
        struct hostent  *he = gethostbyname(host.c_str());
        void            *addr;

        if (he == NULL)
            throw "Unable to find an address for host '" + host + "'";

        switch (he->h_addrtype) {
          case AF_INET:
# ifndef        NO_SA_LEN
            sin->sin_len = sizeof(struct sockaddr_in);
# endif /* NO_SA_LEN */
            addr = &sin->sin_addr;
            break;
# ifdef INET6
          case AF_INET6:
#  ifndef       NO_SA_LEN
            sin6->sin6_len = sizeof(struct sockaddr_in6);
#  endif        /* NO_SA_LEN */
            addr = &sin6->sin6_addr;
            break;
# endif
          default:
            throw "Unrecognized addrtype for host '" + host + "'";
        }
        memmove(addr, he->h_addr_list[0], he->h_length);
        sa->sa_family = he->h_addrtype;
#else   /* BROKEN_GETNAMEINFO */
# ifdef INET6
        if (inet_pton(AF_INET6, host.c_str(), &sin6->sin6_addr) != 1)
# endif
            {
                int     ret = inet_pton(AF_INET, host.c_str(), &sin->sin_addr);
                int     eno = errno;

                switch (ret) {
                  case 1:       // Success
                    break;
                  case 0:       // Invalid
                    throw "Cannot parse address ('" + host + "')";
                  case -1:      // System error
                    std::ostringstream  ostr;

                    ostr << "System error " << eno << " (" << strerror(eno)
                         << ") from inet_pton(" << host << ")";
                    throw ostr.str();
                }
            }
#endif  /* BROKEN_GETNAMEINFO */
        // Get the port number (which will throw if it fails)
        // (There isn't a "port" member in sockaddr_storage, but it's at the
        //  same offset in sockaddr_in and sockaddr_in6, so.....)
        sin->sin_port = htons(short(strtol(conf["port"].c_str(), NULL, 0)));

    } catch (...) {
        delete sa;
        throw;
    }

    return(reinterpret_cast<struct sockaddr*>(sa));
}

#ifdef  NO_SA_LEN
// Return the length of the sockaddr* (really, sockaddr_storage) we're using...
socklen_t
build_addrlen(const sockaddr *addr)
{
    socklen_t   len;

    switch (addr->sa_family) {
      case AF_INET:
        len = sizeof(struct sockaddr_in);
        break;
# ifdef INET6
      case AF_INET6:
        len = sizeof(struct sockaddr_in6);
        break;
# endif /* INET6 */
      case AF_UNIX:
        len = sizeof(struct sockaddr_un);
        break;
    }

    return(len);
}
#endif  /* NO_SA_LEN */

void
mutex_info(std::ostream &out, pthread_mutex_t *mutex)
{
#ifdef __linux__
    out << pthread_self() << " looking at a mutex " << mutex << endl;
    out << pthread_self() << "   __lock: " << mutex->__data.__lock << endl;
    out << pthread_self() << "   __count: " << mutex->__data.__count << endl;
    out << pthread_self() << "   __owner: " << mutex->__data.__owner << endl;
    out << pthread_self() << "   __kind: " << mutex->__data.__kind << endl;
    out << pthread_self() << "   __nusers: " << mutex->__data.__nusers << endl;
#endif
    return;
}

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