inetdgram.cpp

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#include <string.h>
#include <iostream>
#include <memory>
#include <string>

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

// oo wrapper around libinetsocket
/*
   The committers of the libsocket project, all rights reserved
   (c) 2012, dermesser <lbo@spheniscida.de>

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS “AS IS” AND ANY
   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include <libinetsocket.h>
#include <exception.hpp>
#include <inetdgram.hpp>

namespace libsocket {
using std::string;

// I/O

// I

ssize_t inet_dgram::rcvfrom(void* buf, size_t len, char* hostbuf,
                            size_t hostbuflen, char* portbuf, size_t portbuflen,
                            int rcvfrom_flags, bool numeric) {
    ssize_t bytes;
    int num = ((numeric == true) ? LIBSOCKET_NUMERIC : 0);

    if (-1 == sfd)
        throw socket_exception(__FILE__, __LINE__,
                               "inet_dgram::rcvfrom() - Socket is closed!",
                               false);

    if (-1 == (bytes = recvfrom_inet_dgram_socket(
                   sfd, buf, len, hostbuf, hostbuflen, portbuf, portbuflen,
                   rcvfrom_flags, num))) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(__FILE__, __LINE__,
                                   "inet_dgram::rcvfrom() - recvfrom() failed "
                                   "-- could not receive data from peer!");
    }

    return bytes;
}

ssize_t inet_dgram::rcvfrom(void* buf, size_t len, string& srchost,
                            string& srcport, int rcvfrom_flags, bool numeric) {
    ssize_t bytes;

    using std::unique_ptr;
    unique_ptr<char[]> from_host(new char[1024]);
    unique_ptr<char[]> from_port(new char[32]);

    memset(from_host.get(), 0, 1024);
    memset(from_port.get(), 0, 32);
    memset(buf, 0, len);

    // Error checking already done in rcvfrom() method.
    bytes = rcvfrom(buf, len, from_host.get(), 1023, from_port.get(), 31,
                    rcvfrom_flags, numeric);

    srchost.resize(strlen(from_host.get()));
    srcport.resize(strlen(from_port.get()));

    srchost.assign(from_host.get());
    srcport.assign(from_port.get());

    return bytes;
}

ssize_t inet_dgram::rcvfrom(string& buf, string& srchost, string& srcport,
                            int rcvfrom_flags, bool numeric) {
    ssize_t bytes;

    using std::unique_ptr;
    unique_ptr<char[]> cbuf(new char[buf.size()]);

    memset(cbuf.get(), 0, buf.size());

    bytes = rcvfrom(cbuf.get(), static_cast<size_t>(buf.size()), srchost,
                    srcport, rcvfrom_flags,
                    numeric);  // calling inet_dgram::rcvfrom(void*, size_t,
                               // string&, string&, int, bool)

    buf.resize(bytes);

    buf.assign(cbuf.get(), bytes);

    return bytes;
}

// O

ssize_t inet_dgram::sndto(const void* buf, size_t len, const char* dsthost,
                          const char* dstport, int sndto_flags) {
    ssize_t bytes;

    if (-1 == sfd)
        throw socket_exception(__FILE__, __LINE__,
                               "inet_dgram::sendto() - Socket already closed!",
                               false);

    if (-1 == (bytes = sendto_inet_dgram_socket(sfd, buf, len, dsthost, dstport,
                                                sndto_flags))) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(__FILE__, __LINE__,
                                   "inet_dgram::sndto() - Error at sendto");
    }

    return bytes;
}

ssize_t inet_dgram::sndto(const void* buf, size_t len, const string& dsthost,
                          const string& dstport, int sndto_flags) {
    ssize_t bytes;

    bytes = sndto(buf, len, dsthost.c_str(), dstport.c_str(), sndto_flags);

    return bytes;
}

ssize_t inet_dgram::sndto(const string& buf, const string& dsthost,
                          const string& dstport, int sndto_flags) {
    ssize_t bytes;

    bytes = sndto(buf.c_str(), buf.size(), dsthost.c_str(), dstport.c_str(),
                  sndto_flags);

    return bytes;
}
}  // namespace libsocket