/* Serial interface for raw TCP connections on Un*x like systems. Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of GDB. This program 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; either version 2 of the License, or (at your option) any later version. This program 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 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include "defs.h" #include "serial.h" #include "ser-base.h" #include "ser-tcp.h" #include <sys/types.h> #ifdef HAVE_SYS_FILIO_H #include <sys/filio.h> /* For FIONBIO. */ #endif #ifdef HAVE_SYS_IOCTL_H #include <sys/ioctl.h> /* For FIONBIO. */ #endif #include <sys/time.h> #ifdef USE_WIN32API #include <winsock2.h> #define ETIMEDOUT WSAETIMEDOUT #define close(fd) closesocket (fd) #define ioctl ioctlsocket #else #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <sys/socket.h> #include <netinet/tcp.h> #endif #include <signal.h> #include "gdb_string.h" #ifndef HAVE_SOCKLEN_T typedef int socklen_t; #endif void _initialize_ser_tcp (void); /* seconds to wait for connect */ #define TIMEOUT 15 /* how many times per second to poll deprecated_ui_loop_hook */ #define POLL_INTERVAL 2 /* Open a tcp socket */ int net_open (struct serial *scb, const char *name) { char *port_str, hostname[100]; int n, port, tmp; int use_udp; struct hostent *hostent; struct sockaddr_in sockaddr; #ifdef USE_WIN32API u_long ioarg; #else int ioarg; #endif use_udp = 0; if (strncmp (name, "udp:", 4) == 0) { use_udp = 1; name = name + 4; } else if (strncmp (name, "tcp:", 4) == 0) name = name + 4; port_str = strchr (name, ':'); if (!port_str) error (_("net_open: No colon in host name!")); /* Shouldn't ever happen */ tmp = min (port_str - name, (int) sizeof hostname - 1); strncpy (hostname, name, tmp); /* Don't want colon */ hostname[tmp] = '\000'; /* Tie off host name */ port = atoi (port_str + 1); /* default hostname is localhost */ if (!hostname[0]) strcpy (hostname, "localhost"); hostent = gethostbyname (hostname); if (!hostent) { fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname); errno = ENOENT; return -1; } if (use_udp) scb->fd = socket (PF_INET, SOCK_DGRAM, 0); else scb->fd = socket (PF_INET, SOCK_STREAM, 0); if (scb->fd < 0) return -1; sockaddr.sin_family = PF_INET; sockaddr.sin_port = htons (port); memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, sizeof (struct in_addr)); /* set socket nonblocking */ ioarg = 1; ioctl (scb->fd, FIONBIO, &ioarg); /* Use Non-blocking connect. connect() will return 0 if connected already. */ n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)); if (n < 0 #ifdef USE_WIN32API /* Under Windows, calling "connect" with a non-blocking socket results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */ && WSAGetLastError() != WSAEWOULDBLOCK #else && errno != EINPROGRESS #endif ) { #ifdef USE_WIN32API errno = WSAGetLastError(); #endif net_close (scb); return -1; } if (n) { /* looks like we need to wait for the connect */ struct timeval t; fd_set rset, wset, eset; int polls = 0; FD_ZERO (&rset); do { /* While we wait for the connect to complete, poll the UI so it can update or the user can interrupt. */ if (deprecated_ui_loop_hook) { if (deprecated_ui_loop_hook (0)) { errno = EINTR; net_close (scb); return -1; } } FD_SET (scb->fd, &rset); wset = rset; eset = rset; t.tv_sec = 0; t.tv_usec = 1000000 / POLL_INTERVAL; /* POSIX systems return connection success or failure by signalling wset. Windows systems return success in wset and failure in eset. We must call select here, rather than gdb_select, because the serial structure has not yet been initialized - the MinGW select wrapper will not know that this FD refers to a socket. */ n = select (scb->fd + 1, &rset, &wset, &eset, &t); polls++; } while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL); if (n < 0 || polls > TIMEOUT * POLL_INTERVAL) { if (polls > TIMEOUT * POLL_INTERVAL) errno = ETIMEDOUT; net_close (scb); return -1; } } /* Got something. Is it an error? */ { int res, err; socklen_t len; len = sizeof (err); /* On Windows, the fourth parameter to getsockopt is a "char *"; on UNIX systems it is generally "void *". The cast to "void *" is OK everywhere, since in C "void *" can be implicitly converted to any pointer type. */ res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len); if (res < 0 || err) { if (err) errno = err; net_close (scb); return -1; } } /* turn off nonblocking */ ioarg = 0; ioctl (scb->fd, FIONBIO, &ioarg); if (use_udp == 0) { /* Disable Nagle algorithm. Needed in some cases. */ tmp = 1; setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY, (char *)&tmp, sizeof (tmp)); } #ifdef SIGPIPE /* If we don't do this, then GDB simply exits when the remote side dies. */ signal (SIGPIPE, SIG_IGN); #endif return 0; } void net_close (struct serial *scb) { if (scb->fd < 0) return; close (scb->fd); scb->fd = -1; } int net_read_prim (struct serial *scb, size_t count) { return recv (scb->fd, scb->buf, count, 0); } int net_write_prim (struct serial *scb, const void *buf, size_t count) { return send (scb->fd, buf, count, 0); } void _initialize_ser_tcp (void) { #ifdef USE_WIN32API /* Do nothing; the TCP serial operations will be initialized in ser-mingw.c. */ return; #else struct serial_ops *ops; ops = XMALLOC (struct serial_ops); memset (ops, 0, sizeof (struct serial_ops)); ops->name = "tcp"; ops->next = 0; ops->open = net_open; ops->close = net_close; ops->readchar = ser_base_readchar; ops->write = ser_base_write; ops->flush_output = ser_base_flush_output; ops->flush_input = ser_base_flush_input; ops->send_break = ser_base_send_break; ops->go_raw = ser_base_raw; ops->get_tty_state = ser_base_get_tty_state; ops->set_tty_state = ser_base_set_tty_state; ops->print_tty_state = ser_base_print_tty_state; ops->noflush_set_tty_state = ser_base_noflush_set_tty_state; ops->setbaudrate = ser_base_setbaudrate; ops->setstopbits = ser_base_setstopbits; ops->drain_output = ser_base_drain_output; ops->async = ser_base_async; ops->read_prim = net_read_prim; ops->write_prim = net_write_prim; serial_add_interface (ops); #endif /* USE_WIN32API */ }