| 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 | |
| 28 | #ifdef HAVE_SYS_FILIO_H |
| 29 | #include <sys/filio.h> /* For FIONBIO. */ |
| 30 | #endif |
| 31 | #ifdef HAVE_SYS_IOCTL_H |
| 32 | #include <sys/ioctl.h> /* For FIONBIO. */ |
| 33 | #endif |
| 34 | |
| 35 | #include <sys/time.h> |
| 36 | #include <netinet/in.h> |
| 37 | #include <arpa/inet.h> |
| 38 | #include <netdb.h> |
| 39 | #include <sys/socket.h> |
| 40 | #include <netinet/tcp.h> |
| 41 | |
| 42 | #include <signal.h> |
| 43 | #include "gdb_string.h" |
| 44 | |
| 45 | static int net_open (struct serial *scb, const char *name); |
| 46 | static void net_close (struct serial *scb); |
| 47 | extern int (*ui_loop_hook) (int); |
| 48 | void _initialize_ser_tcp (void); |
| 49 | |
| 50 | /* seconds to wait for connect */ |
| 51 | #define TIMEOUT 15 |
| 52 | /* how many times per second to poll ui_loop_hook */ |
| 53 | #define POLL_INTERVAL 2 |
| 54 | |
| 55 | /* Open a tcp socket */ |
| 56 | |
| 57 | static int |
| 58 | net_open (struct serial *scb, const char *name) |
| 59 | { |
| 60 | char *port_str, hostname[100]; |
| 61 | int n, port, tmp; |
| 62 | int use_udp; |
| 63 | struct hostent *hostent; |
| 64 | struct sockaddr_in sockaddr; |
| 65 | |
| 66 | use_udp = 0; |
| 67 | if (strncmp (name, "udp:", 4) == 0) |
| 68 | { |
| 69 | use_udp = 1; |
| 70 | name = name + 4; |
| 71 | } |
| 72 | else if (strncmp (name, "tcp:", 4) == 0) |
| 73 | name = name + 4; |
| 74 | |
| 75 | port_str = strchr (name, ':'); |
| 76 | |
| 77 | if (!port_str) |
| 78 | error ("net_open: No colon in host name!"); /* Shouldn't ever happen */ |
| 79 | |
| 80 | tmp = min (port_str - name, (int) sizeof hostname - 1); |
| 81 | strncpy (hostname, name, tmp); /* Don't want colon */ |
| 82 | hostname[tmp] = '\000'; /* Tie off host name */ |
| 83 | port = atoi (port_str + 1); |
| 84 | |
| 85 | /* default hostname is localhost */ |
| 86 | if (!hostname[0]) |
| 87 | strcpy (hostname, "localhost"); |
| 88 | |
| 89 | hostent = gethostbyname (hostname); |
| 90 | if (!hostent) |
| 91 | { |
| 92 | fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname); |
| 93 | errno = ENOENT; |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | if (use_udp) |
| 98 | scb->fd = socket (PF_INET, SOCK_DGRAM, 0); |
| 99 | else |
| 100 | scb->fd = socket (PF_INET, SOCK_STREAM, 0); |
| 101 | |
| 102 | if (scb->fd < 0) |
| 103 | return -1; |
| 104 | |
| 105 | sockaddr.sin_family = PF_INET; |
| 106 | sockaddr.sin_port = htons (port); |
| 107 | memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, |
| 108 | sizeof (struct in_addr)); |
| 109 | |
| 110 | /* set socket nonblocking */ |
| 111 | tmp = 1; |
| 112 | ioctl (scb->fd, FIONBIO, &tmp); |
| 113 | |
| 114 | /* Use Non-blocking connect. connect() will return 0 if connected already. */ |
| 115 | n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)); |
| 116 | |
| 117 | if (n < 0 && errno != EINPROGRESS) |
| 118 | { |
| 119 | net_close (scb); |
| 120 | return -1; |
| 121 | } |
| 122 | |
| 123 | if (n) |
| 124 | { |
| 125 | /* looks like we need to wait for the connect */ |
| 126 | struct timeval t; |
| 127 | fd_set rset, wset; |
| 128 | int polls = 0; |
| 129 | FD_ZERO (&rset); |
| 130 | |
| 131 | do |
| 132 | { |
| 133 | /* While we wait for the connect to complete |
| 134 | poll the UI so it can update or the user can |
| 135 | interrupt. */ |
| 136 | if (ui_loop_hook) |
| 137 | { |
| 138 | if (ui_loop_hook (0)) |
| 139 | { |
| 140 | errno = EINTR; |
| 141 | net_close (scb); |
| 142 | return -1; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | FD_SET (scb->fd, &rset); |
| 147 | wset = rset; |
| 148 | t.tv_sec = 0; |
| 149 | t.tv_usec = 1000000 / POLL_INTERVAL; |
| 150 | |
| 151 | n = select (scb->fd + 1, &rset, &wset, NULL, &t); |
| 152 | polls++; |
| 153 | } |
| 154 | while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL); |
| 155 | if (n < 0 || polls > TIMEOUT * POLL_INTERVAL) |
| 156 | { |
| 157 | if (polls > TIMEOUT * POLL_INTERVAL) |
| 158 | errno = ETIMEDOUT; |
| 159 | net_close (scb); |
| 160 | return -1; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | /* Got something. Is it an error? */ |
| 165 | { |
| 166 | int res, err, len; |
| 167 | len = sizeof(err); |
| 168 | res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, &err, &len); |
| 169 | if (res < 0 || err) |
| 170 | { |
| 171 | if (err) |
| 172 | errno = err; |
| 173 | net_close (scb); |
| 174 | return -1; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* turn off nonblocking */ |
| 179 | tmp = 0; |
| 180 | ioctl (scb->fd, FIONBIO, &tmp); |
| 181 | |
| 182 | if (use_udp == 0) |
| 183 | { |
| 184 | /* Disable Nagle algorithm. Needed in some cases. */ |
| 185 | tmp = 1; |
| 186 | setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY, |
| 187 | (char *)&tmp, sizeof (tmp)); |
| 188 | } |
| 189 | |
| 190 | /* If we don't do this, then GDB simply exits |
| 191 | when the remote side dies. */ |
| 192 | signal (SIGPIPE, SIG_IGN); |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static void |
| 198 | net_close (struct serial *scb) |
| 199 | { |
| 200 | if (scb->fd < 0) |
| 201 | return; |
| 202 | |
| 203 | close (scb->fd); |
| 204 | scb->fd = -1; |
| 205 | } |
| 206 | |
| 207 | void |
| 208 | _initialize_ser_tcp (void) |
| 209 | { |
| 210 | struct serial_ops *ops = XMALLOC (struct serial_ops); |
| 211 | memset (ops, sizeof (struct serial_ops), 0); |
| 212 | ops->name = "tcp"; |
| 213 | ops->next = 0; |
| 214 | ops->open = net_open; |
| 215 | ops->close = net_close; |
| 216 | ops->readchar = ser_unix_readchar; |
| 217 | ops->write = ser_unix_write; |
| 218 | ops->flush_output = ser_unix_nop_flush_output; |
| 219 | ops->flush_input = ser_unix_flush_input; |
| 220 | ops->send_break = ser_unix_nop_send_break; |
| 221 | ops->go_raw = ser_unix_nop_raw; |
| 222 | ops->get_tty_state = ser_unix_nop_get_tty_state; |
| 223 | ops->set_tty_state = ser_unix_nop_set_tty_state; |
| 224 | ops->print_tty_state = ser_unix_nop_print_tty_state; |
| 225 | ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state; |
| 226 | ops->setbaudrate = ser_unix_nop_setbaudrate; |
| 227 | ops->setstopbits = ser_unix_nop_setstopbits; |
| 228 | ops->drain_output = ser_unix_nop_drain_output; |
| 229 | ops->async = ser_unix_async; |
| 230 | serial_add_interface (ops); |
| 231 | } |