| 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 | } |