gdb/ser-tcp.c

   1 /* Serial interface for raw TCP connections on Un*x like systems
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "serial.h"
  24 #include "ser-unix.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/time.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <netdb.h>
  31 #include <sys/socket.h>
  32 #include <netinet/tcp.h>
  33
  34 #include <signal.h>
  35 #include "gdb_string.h"
  36
  37 static int tcp_open (struct serial *scb, const char *name);
  38 static void tcp_close (struct serial *scb);
  39
  40 void _initialize_ser_tcp (void);
  41
  42 /* Open up a raw tcp socket */
  43
  44 static int
  45 tcp_open (struct serial *scb, const char *name)
  46 {
  47   char *port_str;
  48   int port;
  49   struct hostent *hostent;
  50   struct sockaddr_in sockaddr;
  51   int tmp;
  52   char hostname[100];
  53   struct protoent *protoent;
  54   int i;
  55
  56   port_str = strchr (name, ':');
  57
  58   if (!port_str)
  59     error ("tcp_open: No colon in host name!");         /* Shouldn't ever happen */
  60
  61   tmp = min (port_str - name, (int) sizeof hostname - 1);
  62   strncpy (hostname, name, tmp);        /* Don't want colon */
  63   hostname[tmp] = '\000';       /* Tie off host name */
  64   port = atoi (port_str + 1);
  65
  66   if (!hostname[0])
  67     strcpy (hostname, "localhost");
  68
  69   hostent = gethostbyname (hostname);
  70
  71   if (!hostent)
  72     {
  73       fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
  74       errno = ENOENT;
  75       return -1;
  76     }
  77
  78   for (i = 1; i <= 15; i++)
  79     {
  80       scb->fd = socket (PF_INET, SOCK_STREAM, 0);
  81       if (scb->fd < 0)
  82         return -1;
  83
  84       /* Allow rapid reuse of this port. */
  85       tmp = 1;
  86       setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, sizeof (tmp));
  87
  88       /* Enable TCP keep alive process. */
  89       tmp = 1;
  90       setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
  91
  92       sockaddr.sin_family = PF_INET;
  93       sockaddr.sin_port = htons (port);
  94       memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
  95               sizeof (struct in_addr));
  96
  97       if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)))
  98         break;
  99
 100       close (scb->fd);
 101       scb->fd = -1;
 102
 103 /* We retry for ECONNREFUSED because that is often a temporary condition, which
 104    happens when the server is being restarted.  */
 105
 106       if (errno != ECONNREFUSED)
 107         return -1;
 108
 109       sleep (1);
 110     }
 111
 112   protoent = getprotobyname ("tcp");
 113   if (!protoent)
 114     return -1;
 115
 116   tmp = 1;
 117   if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
 118                   (char *) &tmp, sizeof (tmp)))
 119     return -1;
 120
 121   signal (SIGPIPE, SIG_IGN);    /* If we don't do this, then GDB simply exits
 122                                    when the remote side dies.  */
 123
 124   return 0;
 125 }
 126
 127 static void
 128 tcp_close (struct serial *scb)
 129 {
 130   if (scb->fd < 0)
 131     return;
 132
 133   close (scb->fd);
 134   scb->fd = -1;
 135 }
 136
 137 void
 138 _initialize_ser_tcp (void)
 139 {
 140   struct serial_ops *ops = XMALLOC (struct serial_ops);
 141   memset (ops, sizeof (struct serial_ops), 0);
 142   ops->name = "tcp";
 143   ops->next = 0;
 144   ops->open = tcp_open;
 145   ops->close = tcp_close;
 146   ops->readchar = ser_unix_readchar;
 147   ops->write = ser_unix_write;
 148   ops->flush_output = ser_unix_nop_flush_output;
 149   ops->flush_input = ser_unix_flush_input;
 150   ops->send_break = ser_unix_nop_send_break;
 151   ops->go_raw = ser_unix_nop_raw;
 152   ops->get_tty_state = ser_unix_nop_get_tty_state;
 153   ops->set_tty_state = ser_unix_nop_set_tty_state;
 154   ops->print_tty_state = ser_unix_nop_print_tty_state;
 155   ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state;
 156   ops->setbaudrate = ser_unix_nop_setbaudrate;
 157   ops->setstopbits = ser_unix_nop_setstopbits;
 158   ops->drain_output = ser_unix_nop_drain_output;
 159   ops->async = ser_unix_async;
 160   serial_add_interface (ops);
 161 }