Newer
Older
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 "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();
try {
setlocalip_();
setlocalport_();
setremoteip_();
setremoteport_();
}
catch (...) { }
}
/**
* 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");
// 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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
pthread_mutex_lock(&r_mutex_);
pthread_mutex_lock(&w_mutex_);
// retrieve remote host info
struct hostent *h = gethostbyname(addr);
if (h == 0) {
pthread_mutex_unlock(&w_mutex_);
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(&w_mutex_);
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) {
disconnect_();
pthread_mutex_unlock(&w_mutex_);
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "Unable to connect to " + addr + ": " + strerror(errno__));
try {
setlocalip_();
setlocalport_();
setremoteip_();
setremoteport_();
}
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_);
}
/**
* 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");
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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
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() {
// keep the socket fd
pthread_mutex_lock(&c_mutex_);
int socket_fd = socket_fd_;
pthread_mutex_unlock(&c_mutex_);
// test socket validity
if (socket_fd < 0)
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;
pthread_mutex_lock(&r_mutex_);
pthread_mutex_lock(&w_mutex_);
if ((r_fd = ::accept(socket_fd, (struct sockaddr *) &r_addr, &r_sin_size)) == -1) {
pthread_mutex_unlock(&c_mutex_);
throw Error(ERR_NET, (string) "accept: " + strerror(errno));
}
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_);
// 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
int errno__ = errno;
pthread_mutex_lock(&c_mutex_);
pthread_mutex_lock(&r_mutex_);
disconnect_();
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
pthread_mutex_unlock(&r_mutex_);
throw Error(ERR_NET, "Connection reset by peer");
else
throw Error(ERR_NET, "send: " + (string) strerror(errno__));
pthread_mutex_unlock(&w_mutex_);
}
/**
* 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_();
pthread_mutex_unlock(&r_mutex_);
pthread_mutex_unlock(&c_mutex_);
pthread_mutex_unlock(&r_mutex_);
*local_buf = 0;
if (ret == 0)
throw Error(ERR_NET, "Connection reset by peer");
else
throw Error(ERR_NET, (string) "recvln: " + strerror(errno));
// add read data in buffer
rbuf_ += local_buf;
} while (1);
assert(1);
}
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())
setlocalip_();
string ip = local_ip_;
pthread_mutex_unlock(&c_mutex_);
return ip;
}
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)
setlocalport_();
int port = local_port_;
pthread_mutex_unlock(&c_mutex_);
return port;
}
string Connection::getremoteip() {
// 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_ip_.empty())
setremoteip_();
string ip = remote_ip_;
pthread_mutex_unlock(&c_mutex_);
return ip;
}
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)
setremoteport_();
int port = remote_port_;
pthread_mutex_unlock(&c_mutex_);
return port;
}
unsigned long int Connection::getid() {
return id_;
}
if (socket_fd < 0)
throw Error(ERR_NET, "No connection established but trying to get socket fd");
return socket_fd;