84603566b7
gdb/ * ser-tcp.c: Adjust includes. (tcp_set_cmdlist, tcp_show_cmdlist): Declare. (tcp_auto_retry, tcp_retry_limit): Declare. (TIMEOUT): Remove, in favor of tcp_retry_limit. (POLL_INTERVAL): Increase to 5, in favor of backoff logic. (wait_for_connect): New function. (net_open): Use it. Add auto-retry logic. (set_tcp_cmd, show_tcp_cmd): New functions. (_initialize_ser_tcp): Initialize new "set/show tcp auto-retry" and "set/show tcp connect-timeout" commands. * NEWS: Document new commands. gdb/doc/ * gdb.texinfo (Remote Configuration): Document new "set/show tcp auto-retry" and "set/show tcp connect-timeout" commands.
425 lines
10 KiB
C
425 lines
10 KiB
C
/* Serial interface for raw TCP connections on Un*x like systems.
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Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005, 2006,
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2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "serial.h"
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#include "ser-base.h"
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#include "ser-tcp.h"
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#include "gdbcmd.h"
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#include "cli/cli-decode.h"
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#include "cli/cli-setshow.h"
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#include <sys/types.h>
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#ifdef HAVE_SYS_FILIO_H
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#include <sys/filio.h> /* For FIONBIO. */
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h> /* For FIONBIO. */
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#endif
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#include <sys/time.h>
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#ifdef USE_WIN32API
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#include <winsock2.h>
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#define ETIMEDOUT WSAETIMEDOUT
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#define close(fd) closesocket (fd)
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#define ioctl ioctlsocket
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#else
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/tcp.h>
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#endif
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#include <signal.h>
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#include "gdb_string.h"
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#include "gdb_select.h"
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#ifndef HAVE_SOCKLEN_T
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typedef int socklen_t;
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#endif
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void _initialize_ser_tcp (void);
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/* For "set tcp" and "show tcp". */
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static struct cmd_list_element *tcp_set_cmdlist;
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static struct cmd_list_element *tcp_show_cmdlist;
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/* Whether to auto-retry refused connections. */
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static int tcp_auto_retry = 1;
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/* Timeout period for connections, in seconds. */
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static int tcp_retry_limit = 15;
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/* how many times per second to poll deprecated_ui_loop_hook */
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#define POLL_INTERVAL 5
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/* Helper function to wait a while. If SCB is non-null, wait on its
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file descriptor. Otherwise just wait on a timeout, updating *POLLS.
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Returns -1 on timeout or interrupt, otherwise the value of select. */
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static int
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wait_for_connect (struct serial *scb, int *polls)
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{
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struct timeval t;
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int n;
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/* While we wait for the connect to complete,
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poll the UI so it can update or the user can
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interrupt. */
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if (deprecated_ui_loop_hook && deprecated_ui_loop_hook (0))
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{
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errno = EINTR;
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return -1;
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}
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/* Check for timeout. */
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if (*polls > tcp_retry_limit * POLL_INTERVAL)
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{
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errno = ETIMEDOUT;
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return -1;
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}
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/* Back off to polling once per second after the first POLL_INTERVAL
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polls. */
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if (*polls < POLL_INTERVAL)
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{
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t.tv_sec = 0;
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t.tv_usec = 1000000 / POLL_INTERVAL;
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}
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else
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{
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t.tv_sec = 1;
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t.tv_usec = 0;
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}
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if (scb)
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{
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fd_set rset, wset, eset;
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FD_ZERO (&rset);
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FD_SET (scb->fd, &rset);
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wset = rset;
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eset = rset;
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/* POSIX systems return connection success or failure by signalling
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wset. Windows systems return success in wset and failure in
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eset.
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We must call select here, rather than gdb_select, because
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the serial structure has not yet been initialized - the
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MinGW select wrapper will not know that this FD refers
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to a socket. */
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n = select (scb->fd + 1, &rset, &wset, &eset, &t);
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}
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else
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/* Use gdb_select here, since we have no file descriptors, and on
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Windows, plain select doesn't work in that case. */
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n = gdb_select (0, NULL, NULL, NULL, &t);
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/* If we didn't time out, only count it as one poll. */
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if (n > 0 || *polls < POLL_INTERVAL)
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(*polls)++;
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else
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(*polls) += POLL_INTERVAL;
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return n;
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}
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/* Open a tcp socket */
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int
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net_open (struct serial *scb, const char *name)
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{
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char *port_str, hostname[100];
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int n, port, tmp;
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int use_udp;
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struct hostent *hostent;
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struct sockaddr_in sockaddr;
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#ifdef USE_WIN32API
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u_long ioarg;
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#else
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int ioarg;
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#endif
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int polls = 0;
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use_udp = 0;
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if (strncmp (name, "udp:", 4) == 0)
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{
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use_udp = 1;
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name = name + 4;
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}
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else if (strncmp (name, "tcp:", 4) == 0)
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name = name + 4;
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port_str = strchr (name, ':');
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if (!port_str)
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error (_("net_open: No colon in host name!")); /* Shouldn't ever happen */
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tmp = min (port_str - name, (int) sizeof hostname - 1);
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strncpy (hostname, name, tmp); /* Don't want colon */
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hostname[tmp] = '\000'; /* Tie off host name */
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port = atoi (port_str + 1);
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/* default hostname is localhost */
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if (!hostname[0])
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strcpy (hostname, "localhost");
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hostent = gethostbyname (hostname);
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if (!hostent)
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{
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fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
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errno = ENOENT;
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return -1;
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}
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sockaddr.sin_family = PF_INET;
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sockaddr.sin_port = htons (port);
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memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
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sizeof (struct in_addr));
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retry:
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if (use_udp)
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scb->fd = socket (PF_INET, SOCK_DGRAM, 0);
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else
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scb->fd = socket (PF_INET, SOCK_STREAM, 0);
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if (scb->fd < 0)
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return -1;
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/* set socket nonblocking */
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ioarg = 1;
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ioctl (scb->fd, FIONBIO, &ioarg);
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/* Use Non-blocking connect. connect() will return 0 if connected already. */
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n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));
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if (n < 0)
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{
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#ifdef USE_WIN32API
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int err = WSAGetLastError();
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#else
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int err = errno;
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#endif
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/* Maybe we're waiting for the remote target to become ready to
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accept connections. */
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if (tcp_auto_retry
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#ifdef USE_WIN32API
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&& err == WSAECONNREFUSED
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#else
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&& err == ECONNREFUSED
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#endif
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&& wait_for_connect (NULL, &polls) >= 0)
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{
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close (scb->fd);
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goto retry;
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}
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if (
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#ifdef USE_WIN32API
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/* Under Windows, calling "connect" with a non-blocking socket
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results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */
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err != WSAEWOULDBLOCK
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#else
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err != EINPROGRESS
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#endif
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)
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{
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errno = err;
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net_close (scb);
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return -1;
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}
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/* looks like we need to wait for the connect */
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do
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{
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n = wait_for_connect (scb, &polls);
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}
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while (n == 0);
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if (n < 0)
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{
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net_close (scb);
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return -1;
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}
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}
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/* Got something. Is it an error? */
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{
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int res, err;
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socklen_t len;
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len = sizeof (err);
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/* On Windows, the fourth parameter to getsockopt is a "char *";
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on UNIX systems it is generally "void *". The cast to "void *"
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is OK everywhere, since in C "void *" can be implicitly
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converted to any pointer type. */
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res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len);
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if (res < 0 || err)
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{
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/* Maybe the target still isn't ready to accept the connection. */
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if (tcp_auto_retry
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#ifdef USE_WIN32API
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&& err == WSAECONNREFUSED
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#else
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&& err == ECONNREFUSED
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#endif
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&& wait_for_connect (NULL, &polls) >= 0)
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{
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close (scb->fd);
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goto retry;
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}
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if (err)
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errno = err;
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net_close (scb);
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return -1;
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}
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}
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/* turn off nonblocking */
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ioarg = 0;
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ioctl (scb->fd, FIONBIO, &ioarg);
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if (use_udp == 0)
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{
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/* Disable Nagle algorithm. Needed in some cases. */
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tmp = 1;
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setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY,
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(char *)&tmp, sizeof (tmp));
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}
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#ifdef SIGPIPE
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/* If we don't do this, then GDB simply exits
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when the remote side dies. */
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signal (SIGPIPE, SIG_IGN);
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#endif
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return 0;
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}
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void
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net_close (struct serial *scb)
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{
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if (scb->fd < 0)
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return;
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close (scb->fd);
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scb->fd = -1;
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}
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int
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net_read_prim (struct serial *scb, size_t count)
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{
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return recv (scb->fd, scb->buf, count, 0);
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}
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int
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net_write_prim (struct serial *scb, const void *buf, size_t count)
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{
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return send (scb->fd, buf, count, 0);
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}
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int
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ser_tcp_send_break (struct serial *scb)
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{
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/* Send telnet IAC and BREAK characters. */
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return (serial_write (scb, "\377\363", 2));
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}
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/* Support for "set tcp" and "show tcp" commands. */
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static void
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set_tcp_cmd (char *args, int from_tty)
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{
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help_list (tcp_set_cmdlist, "set tcp ", -1, gdb_stdout);
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}
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static void
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show_tcp_cmd (char *args, int from_tty)
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{
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help_list (tcp_show_cmdlist, "show tcp ", -1, gdb_stdout);
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}
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void
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_initialize_ser_tcp (void)
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{
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#ifdef USE_WIN32API
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/* Do nothing; the TCP serial operations will be initialized in
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ser-mingw.c. */
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#else
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struct serial_ops *ops;
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ops = XMALLOC (struct serial_ops);
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memset (ops, 0, sizeof (struct serial_ops));
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ops->name = "tcp";
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ops->next = 0;
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ops->open = net_open;
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ops->close = net_close;
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ops->readchar = ser_base_readchar;
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ops->write = ser_base_write;
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ops->flush_output = ser_base_flush_output;
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ops->flush_input = ser_base_flush_input;
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ops->send_break = ser_tcp_send_break;
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ops->go_raw = ser_base_raw;
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ops->get_tty_state = ser_base_get_tty_state;
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ops->set_tty_state = ser_base_set_tty_state;
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ops->print_tty_state = ser_base_print_tty_state;
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ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
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ops->setbaudrate = ser_base_setbaudrate;
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ops->setstopbits = ser_base_setstopbits;
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ops->drain_output = ser_base_drain_output;
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ops->async = ser_base_async;
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ops->read_prim = net_read_prim;
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ops->write_prim = net_write_prim;
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serial_add_interface (ops);
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#endif /* USE_WIN32API */
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add_prefix_cmd ("tcp", class_maintenance, set_tcp_cmd, _("\
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TCP protocol specific variables\n\
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Configure variables specific to remote TCP connections"),
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&tcp_set_cmdlist, "set tcp ",
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0 /* allow-unknown */, &setlist);
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add_prefix_cmd ("tcp", class_maintenance, show_tcp_cmd, _("\
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TCP protocol specific variables\n\
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Configure variables specific to remote TCP connections"),
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&tcp_show_cmdlist, "show tcp ",
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0 /* allow-unknown */, &showlist);
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add_setshow_boolean_cmd ("auto-retry", class_obscure,
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&tcp_auto_retry, _("\
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Set auto-retry on socket connect"), _("\
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Show auto-retry on socket connect"),
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NULL, NULL, NULL,
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&tcp_set_cmdlist, &tcp_show_cmdlist);
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add_setshow_uinteger_cmd ("connect-timeout", class_obscure,
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&tcp_retry_limit, _("\
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Set timeout limit for socket connection"), _("\
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Show timeout limit for socket connection"),
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NULL, NULL, NULL,
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&tcp_set_cmdlist, &tcp_show_cmdlist);
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}
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