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/*
This file is part of SLL.
Copyright (C) 2008 Sebastien LUTTRINGER <contact@seblu.net>
SLL is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
SLL is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with SLL; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "slm.hh"
#include "connection.hh"
#include "error.hh"
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <poll.h>
/*******************************************************************************
** Class method
******************************************************************************/
unsigned long int Connection::getconnid() {
static unsigned long int id = 1;
return id++;
}
/*******************************************************************************
** Public method
******************************************************************************/
/**
* Constructor
*
* @param fd socket of the connection (-1) is not exist
*/
Connection::Connection(int fd) : socket_fd_(fd), local_port_(-1), remote_port_(-1), id_(0) {
pthread_mutex_init(&c_mutex_, 0);
pthread_mutex_init(&r_mutex_, 0);
pthread_mutex_init(&w_mutex_, 0);
if (socket_fd_ >= 0)
id_ = getconnid();
}
/**
* Destructor
*/
Connection::~Connection() {
pthread_mutex_destroy(&c_mutex_);
pthread_mutex_destroy(&r_mutex_);
pthread_mutex_destroy(&w_mutex_);
}
/**
* Disconnect socket
*/
void Connection::disconnect() {
// lock connection mutex
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ < 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "No connection established but trying to disconnect");
}
// lock all mutex
pthread_mutex_lock(&r_mutex_);
pthread_mutex_lock(&w_mutex_);
disconnect_();
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
}
/**
* Create connection with @param addr on port @param port
*/
void Connection::connect(const char *addr, int port) {
// check args
if (addr == 0 || *addr == 0)
throw Error(ERR_NET, "Trying to connect on a bad address");
if (port <= 0 || port >= 65536)
throw Error(ERR_NET, "Trying to connect on a bad port number");
// take connection mutex
pthread_mutex_lock(&c_mutex_);
// check already existant connection
if (socket_fd_ >= 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "Connection already established but trying to connect");
}
// take read and write mutex
pthread_mutex_lock(&w_mutex_);
// retrieve remote host info
struct hostent *h = gethostbyname(addr);
if (h == 0) {
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "Unable to resolve: " + addr + ": " + hstrerror(h_errno));
}
// create socket
try { socket_(); }
catch (...) {
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw;
}
// fill sockaddr
struct sockaddr_in daddr;
daddr.sin_family = AF_INET;
daddr.sin_port = htons(port);
daddr.sin_addr = *((struct in_addr *) h->h_addr);
memset(daddr.sin_zero, '\0', sizeof daddr.sin_zero);
// connect
if (::connect(socket_fd_, (struct sockaddr *) &daddr, sizeof daddr) == -1) {
int errno__ = errno;
disconnect_();
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "Unable to connect to " + addr + ": " + strerror(errno__));
}
// set infos
try {
setlocalip_();
setlocalport_();
setremoteip_();
setremoteport_();
}
catch (...) {
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw;
}
pthread_mutex_unlock(&r_mutex_);
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pthread_mutex_unlock(&c_mutex_);
}
/**
* Listen on @param port with queue size of max @param max
*/
void Connection::listen(int port, int max) {
// check arg
if (port <= 0 || port >= 65536)
throw Error(ERR_NET, "Trying to listen on a bad port number");
if (max <= 0)
throw Error(ERR_NET, "Trying to listen with bad wait queue size");
// take connection mutex
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ >= 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "Connection already established but trying to listen");
}
// lock read and write mutex
pthread_mutex_lock(&r_mutex_);
pthread_mutex_lock(&w_mutex_);
// create socket
try { socket_(); }
catch (...) {
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw;
}
// fill sockaddr
struct sockaddr_in saddr;
saddr.sin_family = AF_INET;
saddr.sin_port = htons(port);
saddr.sin_addr.s_addr = INADDR_ANY;
memset(saddr.sin_zero, '\0', sizeof saddr.sin_zero);
// bind on socket
if (bind(socket_fd_, (struct sockaddr *)&saddr, sizeof saddr) == -1) {
disconnect_();
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "Unable to bind: " + strerror(errno));
}
// listen on socket
if (::listen(socket_fd_, max) == -1) {
disconnect_();
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "Unable to listen: " + strerror(errno));
}
// set all infos
try {
setlocalip_();
setlocalport_();
}
catch (...) {
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw;
}
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
}
/**
* Accept new connection on a listening socket
*
* @return null on error, else a new connection
*/
Connection *Connection::accept() {
pthread_mutex_lock(&c_mutex_);
pthread_mutex_lock(&r_mutex_);
pthread_mutex_lock(&w_mutex_);
// get the socket fd
int socket_fd = socket_fd_;
pthread_mutex_unlock(&c_mutex_);
// test socket validity
if (socket_fd < 0) {
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&w_mutex_);
throw Error(ERR_NET, "No connection established but trying to accept");
struct sockaddr_in r_addr;
socklen_t r_sin_size = sizeof r_addr;
int r_fd;
if ((r_fd = ::accept(socket_fd, (struct sockaddr *) &r_addr, &r_sin_size)) == -1) {
int errno__ = errno;
pthread_mutex_lock(&c_mutex_);
disconnect_();
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "accept: " + strerror(errno__));
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}
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&w_mutex_);
return new Connection(r_fd);
}
/**
* Send data on @param buf of size @param len on socket
*/
void Connection::send(const char* buf, size_t len) {
// lock mutex for operation
pthread_mutex_lock(&c_mutex_);
pthread_mutex_lock(&w_mutex_);
// retreive socket_fd and free conn mutex
int socket_fd = socket_fd_;
pthread_mutex_unlock(&c_mutex_);
// test socket validity
if (socket_fd < 0) {
pthread_mutex_unlock(&w_mutex_);
throw Error(ERR_NET, "No connection established but trying to send data");
}
// send is a write operation
int ret = ::send(socket_fd_, buf, len, MSG_NOSIGNAL);
// treat error
if (ret == -1) {
int errno__ = errno;
pthread_mutex_lock(&c_mutex_);
pthread_mutex_lock(&r_mutex_);
disconnect_();
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&w_mutex_);
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if (errno__ == ECONNRESET || errno__ == EPIPE)
throw Error(ERR_NET, "Connection reset by peer");
else
throw Error(ERR_NET, "send: " + (string) strerror(errno__));
}
// release the mutex
pthread_mutex_unlock(&w_mutex_);
}
/**
* Receive raw data
*/
char *Connection::recv(size_t size) {
assert(0);
return 0;
}
/**
* Receive a line
*/
string Connection::recvln() {
// lock mutex for operation
pthread_mutex_lock(&c_mutex_);
pthread_mutex_lock(&r_mutex_);
int socket_fd = socket_fd_;
pthread_mutex_unlock(&c_mutex_);
// test socket validity
if (socket_fd < 0) {
pthread_mutex_unlock(&r_mutex_);
throw Error(ERR_NET, "No connection established but trying to receive line");
}
do {
// check EOL char
size_t offset = rbuf_.find('\n');
if (offset != string::npos) {
string s = rbuf_.substr(0, offset);
rbuf_.erase(0, offset + 1);
pthread_mutex_unlock(&r_mutex_);
return s;
}
// read data
static char local_buf[MAX_LINE_SIZE];
int ret = ::recv(socket_fd, local_buf, MAX_LINE_SIZE, 0);
if (ret == -1 || ret == 0) {
pthread_mutex_lock(&c_mutex_);
pthread_mutex_lock(&w_mutex_);
disconnect_();
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pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
*local_buf = 0;
if (ret == 0)
throw Error(ERR_NET, "Connection reset by peer");
else
throw Error(ERR_NET, (string) "recvln: " + strerror(errno));
}
local_buf[ret] = 0;
// add read data in buffer
rbuf_ += local_buf;
} while (1);
assert(1);
}
void Connection::flush() {
assert(0);
}
string Connection::getlocalip() {
// get local ip is a conn op
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ < 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "No connection established but trying to get local ip");
}
if (local_ip_.empty())
try { setlocalip_(); }
catch (...) {
pthread_mutex_unlock(&c_mutex_);
throw;
}
string ip = local_ip_;
pthread_mutex_unlock(&c_mutex_);
return ip;
}
string Connection::getlocalhostname() {
pthread_mutex_lock(&c_mutex_);
if (local_hostname_.empty()) {
char buf[256];
if (::gethostname(buf, 256) != 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "Unable to get local hostname: " + strerror(errno));
}
try { local_hostname_ = buf; }
catch (...) {
pthread_mutex_unlock(&c_mutex_);
throw;
}
}
pthread_mutex_unlock(&c_mutex_);
return local_hostname_;
}
int Connection::getlocalport() {
// get local port is a conn op
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ < 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "No connection established but trying to get local port");
}
if (local_port_ == -1)
try { setlocalport_(); }
catch (...) {
pthread_mutex_unlock(&c_mutex_);
throw;
}
int port = local_port_;
pthread_mutex_unlock(&c_mutex_);
return port;
}
string Connection::getremoteip() {
// get remote hostname is a conn op
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ < 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "No connection established but trying to get remote ip");
}
if (remote_ip_.empty())
try { setremoteip_(); }
catch (...) {
pthread_mutex_unlock(&c_mutex_);
throw;
}
string ip = remote_ip_;
pthread_mutex_unlock(&c_mutex_);
return ip;
}
string Connection::getremotehostname() {
// get remote ip is a conn op
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ < 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "No connection established but trying to get remote ip");
}
if (remote_hostname_.empty())
try {setremotehostname_(); }
catch (...) {
pthread_mutex_unlock(&c_mutex_);
throw;
}
string hostname = remote_hostname_;
pthread_mutex_unlock(&c_mutex_);
return hostname;
}
int Connection::getremoteport() {
// get remote port is a conn op
pthread_mutex_lock(&c_mutex_);
if (socket_fd_ < 0) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, "No connection established but trying to get remote port");
}
if (remote_port_ == -1)
try {setremoteport_(); }
catch (...) {
pthread_mutex_unlock(&c_mutex_);
throw;
}
int port = remote_port_;
pthread_mutex_unlock(&c_mutex_);
return port;
}
unsigned long int Connection::getid() {
return id_;
}
int Connection::getsocket() {
// get socket is a conn op
pthread_mutex_lock(&c_mutex_);
int socket_fd = socket_fd_;
pthread_mutex_unlock(&c_mutex_);
if (socket_fd < 0)
throw Error(ERR_NET, "No connection established but trying to get socket fd");
return socket_fd;
}
/*******************************************************************************
** Protected method
******************************************************************************/