streamclient.cpp

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/*
   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 <string.h>
#include <unistd.h>
#include <memory>
#include <string>
 
#include <conf.h>
#include <libinetsocket.h>
#include <exception.hpp>
#include <streamclient.hpp>
 
namespace libsocket {
stream_client_socket::stream_client_socket() : shut_rd(false), shut_wr(false) {}
 
ssize_t stream_client_socket::rcv(void* buf, size_t len, int flags) {
    ssize_t recvd;
 
    if (shut_rd == true)
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::rcv() - Socket has already been shut down!",
            false);
 
    if (sfd == -1)
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::rcv() - Socket is not connected!", false);
 
    if (buf == NULL || len == 0)
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::rcv() - Buffer or length is null!", false);
 
    memset(buf, 0, len);
 
    if (-1 == (recvd = ::recv(sfd, buf, len, flags))) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(
                __FILE__, __LINE__,
                "stream_client_socket::rcv() - Error while reading!");
    }
 
    return recvd;
}
 
stream_client_socket& operator>>(stream_client_socket& sock, string& dest) {
    ssize_t read_bytes;
 
    if (sock.shut_rd == true)
        throw socket_exception(__FILE__, __LINE__,
                               "stream_client_socket::operator>>(std::string) "
                               "- Socket has already been shut down!",
                               false);
 
    using std::unique_ptr;
    unique_ptr<char[]> buffer(new char[dest.size()]);
 
    memset(buffer.get(), 0, dest.size());
 
    if (sock.sfd == -1) {
        throw socket_exception(__FILE__, __LINE__,
                               ">>(std::string) input: Socket not connected!",
                               false);
    }
 
    if (-1 == (read_bytes = read(sock.sfd, buffer.get(), dest.size()))) {
        if (sock.is_nonblocking && errno == EWOULDBLOCK) {
            dest.clear();
            return sock;
        } else
            throw socket_exception(
                __FILE__, __LINE__,
                ">>(std::string) input: Error while reading!");
    }
 
    if (read_bytes < static_cast<ssize_t>(dest.size()))
        dest.resize(read_bytes);  // So the client doesn't print content more
                                  // than one time and it can check if the
                                  // string's length is 0 (end of transmission)
 
    dest.assign(buffer.get(), read_bytes);
 
    return sock;
}
 
// O
 
stream_client_socket& operator<<(stream_client_socket& sock, const char* str) {
    if (sock.shut_wr == true)
        throw socket_exception(__FILE__, __LINE__,
                               "stream_client_socket::operator<<(const char*) "
                               "- Socket has already been shut down!",
                               false);
    if (sock.sfd == -1)
        throw socket_exception(__FILE__, __LINE__,
                               "<<(const char*) output: Socket not connected!",
                               false);
    if (str == NULL)
        throw socket_exception(__FILE__, __LINE__,
                               "<<(const char*) output: Null buffer given!",
                               false);
 
    size_t len = strlen(str);
 
    if (-1 == write(sock.sfd, str, len))
        throw socket_exception(__FILE__, __LINE__,
                               "<<(const char*) output: Write failed!");
 
    return sock;
}
 
stream_client_socket& operator<<(stream_client_socket& sock,
                                 const string& str) {
    if (sock.shut_wr == true)
        throw socket_exception(__FILE__, __LINE__,
                               "stream_client_socket::operator<<(std::string) "
                               "- Socket has already been shut down!",
                               false);
    if (sock.sfd == -1)
        throw socket_exception(__FILE__, __LINE__,
                               "<<(std::string) output: Socket not connected!",
                               false);
 
    if (-1 == write(sock.sfd, str.c_str(), str.size()))
        throw socket_exception(__FILE__, __LINE__,
                               "<<(std::string) output: Write failed!");
 
    return sock;
}
 
ssize_t stream_client_socket::snd(const void* buf, size_t len, int flags) {
    ssize_t snd_bytes;
 
    if (shut_wr == true)
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::snd() - Socket has already been shut down!",
            false);
    if (sfd == -1)
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::snd() - Socket not connected!", false);
    if (buf == NULL || len == 0)
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::snd() - Buffer or length is null!", false);
 
    if (-1 == (snd_bytes = ::send(sfd, buf, len, flags))) {
        if (is_nonblocking && errno == EWOULDBLOCK)
            return -1;
        else
            throw socket_exception(
                __FILE__, __LINE__,
                "stream_client_socket::snd() - Error while sending");
    }
 
    return snd_bytes;
}
 
void stream_client_socket::shutdown(int method) {
    int u_method = 0;  // unix flags
 
    // Already shut down using this method...
    if ((method & (LIBSOCKET_READ | LIBSOCKET_WRITE)) && (shut_rd == true) &&
        (shut_wr == true))
        return;
    if ((method & LIBSOCKET_READ) && (shut_rd == true)) return;
    if ((method & LIBSOCKET_WRITE) && (shut_wr == true)) return;
 
    if (method == (LIBSOCKET_READ | LIBSOCKET_WRITE))
        u_method = SHUT_RDWR;
    else if (method == LIBSOCKET_READ)
        u_method = SHUT_RD;
    else if (method == LIBSOCKET_WRITE)
        u_method = SHUT_WR;
    else  // With no valid combination
        return;
 
    if (0 >
        ::shutdown(sfd, u_method))  // It's equal whether we use this or
                                            // its brother from libunixsocket
    {
        throw socket_exception(
            __FILE__, __LINE__,
            "stream_client_socket::shutdown() - Could not shutdown socket");
    }
 
    if (method & LIBSOCKET_READ) shut_rd = true;
    if (method & LIBSOCKET_WRITE) shut_wr = true;
}
}  // namespace libsocket