unixdgram.cpp

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#include <string.h>
#include <unistd.h>
#include <string>

#include <memory>

/*
   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 <libunixsocket.h>
#include <exception.hpp>
#include <unixdgram.hpp>

namespace libsocket {
ssize_t unix_dgram::sndto(const void* buf, size_t length, const char* path,
                          int sendto_flags) {
    if (buf == NULL)
        throw socket_exception(__FILE__, __LINE__,
                               "unix_dgram::sndto: Buffer is NULL!", false);

    ssize_t bytes;

    if (0 > (bytes = sendto_unix_dgram_socket(sfd, buf, length, path,
                                              sendto_flags))) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(
                __FILE__, __LINE__,
                "unix_dgram::sndto: Could not send data to peer!");
    }

    return bytes;
}

ssize_t unix_dgram::sndto(const void* buf, size_t length, const string& path,
                          int sendto_flags) {
    return sndto(buf, length, path.c_str(), sendto_flags);
}

ssize_t unix_dgram::sndto(const string& buf, const string& path,
                          int sendto_flags) {
    return sndto(static_cast<const void*>(buf.c_str()), buf.size(),
                 path.c_str(), sendto_flags);
}

ssize_t unix_dgram::rcvfrom(void* buf, size_t length, char* source,
                            size_t source_len, int recvfrom_flags) {
    if (buf == NULL)
        throw socket_exception(__FILE__, __LINE__,
                               "unix_dgram::rcvfrom: Buffer is NULL!", false);

    ssize_t bytes;

    bytes = recvfrom_unix_dgram_socket(sfd, buf, length, source, source_len,
                                       recvfrom_flags);

    if (bytes < 0) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(
                __FILE__, __LINE__,
                "unix_dgram::rcvfrom: Could not receive data from peer!");
    }

    return bytes;
}

ssize_t unix_dgram::rcvfrom(void* buf, size_t length, string& source,
                            int recvfrom_flags) {
    if (buf == NULL)
        throw socket_exception(__FILE__, __LINE__,
                               "unix_dgram::rcvfrom: Buffer is NULL!", false);

    ssize_t bytes;

    using std::unique_ptr;

    unique_ptr<char[]> source_cstr(
        new char[108]);  // AFAIK, the address field in struct sockaddr_un is
                         // only 108 bytes long...
    size_t source_cstr_len;

    memset(source_cstr.get(), 0, 108);

    bytes = recvfrom_unix_dgram_socket(sfd, buf, length, source_cstr.get(), 107,
                                       recvfrom_flags);

    if (bytes < 0) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(
                __FILE__, __LINE__,
                "unix_dgram::rcvfrom: Could not receive data from peer!");
    }

    source_cstr_len = strlen(source_cstr.get());

    source.resize(source_cstr_len);

    source = source_cstr.get();

    return bytes;
}

ssize_t unix_dgram::rcvfrom(string& buf, string& source, int recvfrom_flags) {
    if (buf.empty())
        throw socket_exception(__FILE__, __LINE__,
                               "unix_dgram::rcvfrom: Buffer is empty!", false);

    ssize_t bytes;

    using std::unique_ptr;

    unique_ptr<char[]> source_cstr(
        new char[108]);  // AFAIK, the address field in struct sockaddr_un is
                         // only 108 bytes...
    unique_ptr<char[]> cbuf(new char[buf.size()]);

    size_t source_cstr_len;

    memset(source_cstr.get(), 0, 108);

    bytes = recvfrom_unix_dgram_socket(sfd, cbuf.get(), buf.size(),
                                       source_cstr.get(), 107, recvfrom_flags);

    if (bytes < 0) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(
                __FILE__, __LINE__,
                "unix_dgram::rcvfrom: Could not receive data from peer!");
    }

    source_cstr_len = strlen(source_cstr.get());

    source.resize(source_cstr_len);
    buf.resize(bytes);

    buf.assign(cbuf.get(), bytes);
    source.assign(source_cstr.get(), source_cstr_len);

    return bytes;
}
}  // namespace libsocket