X-Git-Url: http://developer.intra2net.com/git/?p=libt2n;a=blobdiff_plain;f=src%2Fsocket_server.cpp;h=f0e573b3101e8c6e36133f10b5032116b1d2e29f;hp=f94d9598671147d6f13f02cef30b98858929fff6;hb=5816531135da09aceb7a026eeade735cbd20ef03;hpb=ac7fdc22899c0c493fda5fdb3a4cb67e77504a6b

diff --git a/src/socket_server.cpp b/src/socket_server.cpp
index f94d959..f0e573b 100644
--- a/src/socket_server.cpp
+++ b/src/socket_server.cpp
@@ -17,7 +17,28 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/time.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+#include <time.h>
+#include <pwd.h>
+#include <grp.h>
+
+#include <sstream>
+
 #include "socket_server.hxx"
+#include "t2n_exception.hxx"
+
+using namespace std;
 
 namespace libt2n
 {
@@ -25,49 +46,307 @@ namespace libt2n
 socket_server::socket_server(int port, const char* ip)
     : server()
 {
-    type=tcp;
+    socket_type=tcp_s;
 
 }
 
-socket_server::socket_server(const char* path, mode_t chmod, const char* user, const char* group)
+socket_server::socket_server(const char* path, mode_t filemode, const char* user, const char* group)
     : server()
 {
-    type=unix;
+    socket_type=unix_s;
     unix_path=path;
 
-    struct sockaddr_un unix_name;
-
     /* Create the socket. */
-    socket = socket (PF_UNIX, SOCK_STREAM, 0);
-    if (socket < 0)
+    sock = socket (PF_UNIX, SOCK_STREAM, 0);
+    if (sock < 0)
     {
         string err="error opening socket: ";
-        err+=::strerror(errno);
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    set_socket_options(sock);
+
+    /* Give the socket a name. */
+    struct sockaddr_un unix_name;
+    unix_name.sun_family = AF_UNIX;
+    strncpy (unix_name.sun_path, unix_path.c_str(),sizeof(unix_name.sun_path));
+
+    /* just to make sure there is no other socket file */
+    unlink (unix_name.sun_path);
+
+    if (bind (sock, (struct sockaddr *) &unix_name, sizeof (unix_name)) < 0)
+    {
+        string err="error binding socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    /* change permissions */
+    if (chmod (unix_name.sun_path, filemode) != 0) 
+    {
+        string err="error changing permission: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    struct passwd *socket_user = getpwnam (user);
+    if (socket_user == NULL) 
+    {
+        string err="error getting socket user: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    struct group *socket_group = getgrnam (group);
+    if (socket_group == NULL) 
+    {
+        string err="error getting socket group: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    if (chown (unix_name.sun_path, socket_user->pw_uid, socket_group->gr_gid) != 0) 
+    {
+        string err="error changing socket ownership: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    if (listen (sock, 5) < 0)
+    {
+        string err="error listening to socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
 
-//        throw EXCEPTION(network_server_error,err);
+    /* clear & insert server sock into the fd_tab to prepare select */
+    FD_ZERO(&connection_set);
+    FD_SET (sock, &connection_set);
+}
+
+void socket_server::set_socket_options(int sock)
+{
+    int i=1;
+
+    /* fast reuse enable */
+    if (setsockopt(sock,SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i)) < 0)
+    {
+        string err="error setting socket option: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    /* keepalive enable */
+    if (setsockopt(sock,SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i)) < 0)
+    {
+        string err="error setting socket option: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
     }
 
+    /* close on exec */
+    int fdflags;
+    fdflags=fcntl(sock,F_GETFD, 0);
+    if (fdflags < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+    fdflags |= FD_CLOEXEC;
+    if (fcntl(sock,F_SETFD,fdflags) < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    /* non-blocking mode */
+    int flflags;
+    flflags=fcntl(sock,F_GETFL,0);
+    if (flflags < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+    flflags |= O_NONBLOCK;
+    if (fcntl(sock,F_SETFL,flflags) < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
 }
 
 socket_server::~socket_server()
 {
-    close(socket);
+    close(sock);
 
-    if (type==unix)
+    if (socket_type==unix_s)
         unlink(unix_path.c_str());
 }
 
+void socket_server::new_connection()
+{
+    struct sockaddr_un clientname;
+
+    unsigned int size = sizeof (clientname);
+    int newsock = accept (sock,(struct sockaddr *) &clientname,&size);
+    if (newsock < 0)
+    {
+        if (errno == EAGAIN)
+        {
+            log(error, "accept error (EAGAIN): no connection waiting");
+            return;
+        }
+
+        /* default: break */
+        string err="error accepting connection: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    FD_SET (newsock, &connection_set);
+
+    int i=1;
+
+    /* keepalive enable */
+    if (setsockopt(newsock,SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i)) < 0)
+    {
+        string err="error setting socket option: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    /* close on exec */
+    int fdflags;
+    fdflags=fcntl(newsock,F_GETFD, 0);
+    if (fdflags < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+    fdflags |= FD_CLOEXEC;
+    if (fcntl(newsock,F_SETFD,fdflags) < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+
+    /* non-blocking mode */
+    int flflags;
+    flflags=fcntl(newsock,F_GETFL,0);
+    if (flflags < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
+    flflags |= O_NONBLOCK;
+    if (fcntl(newsock,F_SETFL,flflags) < 0)
+    {
+        string err="fcntl error on socket: ";
+        err+=strerror(errno);
+        log(error, err);
+        throw t2n_server_error(err);
+    }
 
+    add_connection(new socket_connection(newsock, get_default_timeout()));
+
+    return;
+}
 
 void socket_server::fill_buffer(long long usec_timeout)
 {
+    fd_set used_fdset=connection_set;
+
+    /* set timeout */
+    struct timeval tval;
+    struct timeval *timeout_ptr;
+
+    if (usec_timeout == -1)
+        timeout_ptr = NULL;
+    else
+    {
+        timeout_ptr = &tval;
 
+        // timeout von long long usec in int sec + int usec umrechnen
+        tval.tv_sec = usec_timeout / 1000000;
+        tval.tv_usec = usec_timeout % 1000000;
+    }
+
+    int ret=select (FD_SETSIZE, &used_fdset, NULL, NULL, timeout_ptr);
+
+    if (ret < 0)
+    {
+        if (errno == EINTR)
+        {
+            // select interrupted by signal
+            ret=0;
+        }
+        else
+        {
+            string err="select error: ";
+            err+=strerror(errno);
+            log(error, err);
+            throw t2n_server_error(err);
+        }
+    }
+
+    if (ret > 0)
+    {
+        // we have data pending
+
+        // check for new connection
+        if (FD_ISSET (sock, &used_fdset))
+        {
+            new_connection();
+        }
+
+        // check all connections for pending data
+        fill_connection_buffers();
+    }
+
+    return;
 }
 
-socket_connection::socket_connection(int _socket, int _timeout)
-    : connection(_timeout)
+void socket_server::fill_connection_buffers()
 {
+    std::map<unsigned int, connection*>::iterator ie=connections.end();
+    for(std::map<unsigned int, connection*>::iterator i=connections.begin(); i != ie; i++)
+        if (!i->second->is_closed())
+        {
+            socket_connection* cp=dynamic_cast<socket_connection*>(i->second);
+            cp->fill_buffer(connection_set);
+        }
+}
 
+socket_connection::socket_connection(int _sock, int _timeout)
+    : connection(_timeout)
+{
+    sock=_sock;
 }
 
 void socket_connection::close()
@@ -75,14 +354,124 @@ void socket_connection::close()
 
 }
 
-void socket_connection::fill_buffer(void)
+void socket_connection::fill_buffer(fd_set &cur_fdset)
 {
+    bool try_again=false;
+
+    if (is_closed() || !FD_ISSET (sock, &cur_fdset))
+        return;                                                // no data pending or connection closed
+
+    // data pending -> go and get it
+    char socket_buffer[recv_buffer_size];
+
+    int nbytes = read (sock, socket_buffer, recv_buffer_size);
+    if (nbytes < 0)
+    {
+        if (errno == EAGAIN)
+        {
+            if (my_server)
+                my_server->log(server::error,"read error: no data (EAGAIN) for connection "+get_id_string());
+            return;
+        }
+        else if (errno == EINTR)
+        {
+            // interrupted, try again
+            try_again=true;
+        }
+        else
+        {
+            if (my_server)
+                my_server->log(server::error,"error reading from socket of connection "+get_id_string()+": "+strerror(errno));
+            return;
+        }
+    }
+
+    // End-of-file
+    if (nbytes == 0 && !try_again)
+    {
+        close();
+        return;
+    }
+
+    // Data read -> store it
+    if (nbytes > 0)
+        buffer.assign(socket_buffer,nbytes);
+
+    // more data waiting?
+    fd_set active_fd_set;
+    struct timeval tval;
+
+    FD_ZERO (&active_fd_set);
+    FD_SET (sock, &active_fd_set);
+
+    /* no waiting */
+    tval.tv_sec=0;
+    tval.tv_usec=0;
+
+    if (select (FD_SETSIZE, &active_fd_set, NULL, NULL, &tval) >0)
+    {
+        /* more data waiting -> recurse */
+        fill_buffer(active_fd_set);
+    }
 
+    reset_timeout();
+
+    return;
 }
 
 void socket_connection::write(const std::string& data)
 {
+    static const unsigned int write_block_size=4096;
+
+    if (is_closed())
+        return;
+
+    // prepend packet size to data
+    packet_size_indicator psize=data.size();
+    string send_data(data);
+    send_data.insert(0,(char*)psize,sizeof(packet_size_indicator));
+
+    int offset = 0;
+    while (offset < send_data.size())
+    {
+        unsigned int write_size=write_block_size;
+
+        if (offset+write_size > send_data.size())
+            write_size = send_data.size()-offset;
+
+        int rtn;
+        while ((rtn=::write(sock, send_data.data()+offset, write_size)) &&
+               rtn == -1 && (errno == EAGAIN || errno == EINTR))
+        {
+            usleep (80000);
+            if (my_server)
+                my_server->log(server::debug,"resuming write() call after EAGAIN or EINTR for connection "+get_id_string());
+        }
+
+        if (rtn == -1)
+        {
+            if (my_server)
+                my_server->log(server::error,"write() error on connection "+get_id_string()+": "+strerror(errno));
+        }
+        else if (rtn != write_size)
+        {
+            if (my_server)
+            {
+                ostringstream msg;
+                msg << "write() error on connection " << get_id() 
+                    << ": wrote " << rtn << " bytes, should have been " 
+                    << write_size << " (complete: " << send_data.size() << ")";
+
+                my_server->log(server::error,msg.str());
+            }
+        }
+
+        offset += write_size;
+    }
+
+    reset_timeout();
 
+    return;
 }
 
 }