| 1 | /* Serial interface for raw TCP connections on Un*x like systems. |
| 2 | |
| 3 | Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "serial.h" |
| 25 | #include "ser-base.h" |
| 26 | #include "ser-unix.h" |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | |
| 30 | #ifdef HAVE_SYS_FILIO_H |
| 31 | #include <sys/filio.h> /* For FIONBIO. */ |
| 32 | #endif |
| 33 | #ifdef HAVE_SYS_IOCTL_H |
| 34 | #include <sys/ioctl.h> /* For FIONBIO. */ |
| 35 | #endif |
| 36 | |
| 37 | #include <sys/time.h> |
| 38 | |
| 39 | #ifdef USE_WIN32API |
| 40 | #include <winsock2.h> |
| 41 | #define ETIMEDOUT WSAETIMEDOUT |
| 42 | #define close closesocket |
| 43 | #define ioctl ioctlsocket |
| 44 | #else |
| 45 | #include <netinet/in.h> |
| 46 | #include <arpa/inet.h> |
| 47 | #include <netdb.h> |
| 48 | #include <sys/socket.h> |
| 49 | #include <netinet/tcp.h> |
| 50 | #endif |
| 51 | |
| 52 | #include <signal.h> |
| 53 | #include "gdb_string.h" |
| 54 | |
| 55 | #ifndef HAVE_SOCKLEN_T |
| 56 | typedef int socklen_t; |
| 57 | #endif |
| 58 | |
| 59 | static int net_open (struct serial *scb, const char *name); |
| 60 | static void net_close (struct serial *scb); |
| 61 | void _initialize_ser_tcp (void); |
| 62 | |
| 63 | /* seconds to wait for connect */ |
| 64 | #define TIMEOUT 15 |
| 65 | /* how many times per second to poll deprecated_ui_loop_hook */ |
| 66 | #define POLL_INTERVAL 2 |
| 67 | |
| 68 | /* Open a tcp socket */ |
| 69 | |
| 70 | static int |
| 71 | net_open (struct serial *scb, const char *name) |
| 72 | { |
| 73 | char *port_str, hostname[100]; |
| 74 | int n, port, tmp; |
| 75 | int use_udp; |
| 76 | struct hostent *hostent; |
| 77 | struct sockaddr_in sockaddr; |
| 78 | #ifdef USE_WIN32API |
| 79 | u_long ioarg; |
| 80 | #else |
| 81 | int ioarg; |
| 82 | #endif |
| 83 | |
| 84 | use_udp = 0; |
| 85 | if (strncmp (name, "udp:", 4) == 0) |
| 86 | { |
| 87 | use_udp = 1; |
| 88 | name = name + 4; |
| 89 | } |
| 90 | else if (strncmp (name, "tcp:", 4) == 0) |
| 91 | name = name + 4; |
| 92 | |
| 93 | port_str = strchr (name, ':'); |
| 94 | |
| 95 | if (!port_str) |
| 96 | error (_("net_open: No colon in host name!")); /* Shouldn't ever happen */ |
| 97 | |
| 98 | tmp = min (port_str - name, (int) sizeof hostname - 1); |
| 99 | strncpy (hostname, name, tmp); /* Don't want colon */ |
| 100 | hostname[tmp] = '\000'; /* Tie off host name */ |
| 101 | port = atoi (port_str + 1); |
| 102 | |
| 103 | /* default hostname is localhost */ |
| 104 | if (!hostname[0]) |
| 105 | strcpy (hostname, "localhost"); |
| 106 | |
| 107 | hostent = gethostbyname (hostname); |
| 108 | if (!hostent) |
| 109 | { |
| 110 | fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname); |
| 111 | errno = ENOENT; |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | if (use_udp) |
| 116 | scb->fd = socket (PF_INET, SOCK_DGRAM, 0); |
| 117 | else |
| 118 | scb->fd = socket (PF_INET, SOCK_STREAM, 0); |
| 119 | |
| 120 | if (scb->fd < 0) |
| 121 | return -1; |
| 122 | |
| 123 | sockaddr.sin_family = PF_INET; |
| 124 | sockaddr.sin_port = htons (port); |
| 125 | memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, |
| 126 | sizeof (struct in_addr)); |
| 127 | |
| 128 | /* set socket nonblocking */ |
| 129 | ioarg = 1; |
| 130 | ioctl (scb->fd, FIONBIO, &ioarg); |
| 131 | |
| 132 | /* Use Non-blocking connect. connect() will return 0 if connected already. */ |
| 133 | n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr)); |
| 134 | |
| 135 | if (n < 0 |
| 136 | #ifdef USE_WIN32API |
| 137 | /* Under Windows, calling "connect" with a non-blocking socket |
| 138 | results in WSAEWOULDBLOCK, not WSAEINPROGRESS. */ |
| 139 | && WSAGetLastError() != WSAEWOULDBLOCK |
| 140 | #else |
| 141 | && errno != EINPROGRESS |
| 142 | #endif |
| 143 | ) |
| 144 | { |
| 145 | #ifdef USE_WIN32API |
| 146 | errno = WSAGetLastError(); |
| 147 | #endif |
| 148 | net_close (scb); |
| 149 | return -1; |
| 150 | } |
| 151 | |
| 152 | if (n) |
| 153 | { |
| 154 | /* looks like we need to wait for the connect */ |
| 155 | struct timeval t; |
| 156 | fd_set rset, wset; |
| 157 | int polls = 0; |
| 158 | FD_ZERO (&rset); |
| 159 | |
| 160 | do |
| 161 | { |
| 162 | /* While we wait for the connect to complete, |
| 163 | poll the UI so it can update or the user can |
| 164 | interrupt. */ |
| 165 | if (deprecated_ui_loop_hook) |
| 166 | { |
| 167 | if (deprecated_ui_loop_hook (0)) |
| 168 | { |
| 169 | errno = EINTR; |
| 170 | net_close (scb); |
| 171 | return -1; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | FD_SET (scb->fd, &rset); |
| 176 | wset = rset; |
| 177 | t.tv_sec = 0; |
| 178 | t.tv_usec = 1000000 / POLL_INTERVAL; |
| 179 | |
| 180 | n = select (scb->fd + 1, &rset, &wset, NULL, &t); |
| 181 | polls++; |
| 182 | } |
| 183 | while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL); |
| 184 | if (n < 0 || polls > TIMEOUT * POLL_INTERVAL) |
| 185 | { |
| 186 | if (polls > TIMEOUT * POLL_INTERVAL) |
| 187 | errno = ETIMEDOUT; |
| 188 | net_close (scb); |
| 189 | return -1; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /* Got something. Is it an error? */ |
| 194 | { |
| 195 | int res, err; |
| 196 | socklen_t len; |
| 197 | len = sizeof(err); |
| 198 | /* On Windows, the fourth parameter to getsockopt is a "char *"; |
| 199 | on UNIX systems it is generally "void *". The cast to "void *" |
| 200 | is OK everywhere, since in C "void *" can be implicitly |
| 201 | converted to any pointer type. */ |
| 202 | res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len); |
| 203 | if (res < 0 || err) |
| 204 | { |
| 205 | if (err) |
| 206 | errno = err; |
| 207 | net_close (scb); |
| 208 | return -1; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* turn off nonblocking */ |
| 213 | ioarg = 0; |
| 214 | ioctl (scb->fd, FIONBIO, &ioarg); |
| 215 | |
| 216 | if (use_udp == 0) |
| 217 | { |
| 218 | /* Disable Nagle algorithm. Needed in some cases. */ |
| 219 | tmp = 1; |
| 220 | setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY, |
| 221 | (char *)&tmp, sizeof (tmp)); |
| 222 | } |
| 223 | |
| 224 | #ifdef SIGPIPE |
| 225 | /* If we don't do this, then GDB simply exits |
| 226 | when the remote side dies. */ |
| 227 | signal (SIGPIPE, SIG_IGN); |
| 228 | #endif |
| 229 | |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static void |
| 234 | net_close (struct serial *scb) |
| 235 | { |
| 236 | if (scb->fd < 0) |
| 237 | return; |
| 238 | |
| 239 | close (scb->fd); |
| 240 | scb->fd = -1; |
| 241 | } |
| 242 | |
| 243 | static int |
| 244 | net_read_prim (struct serial *scb, size_t count) |
| 245 | { |
| 246 | return recv (scb->fd, scb->buf, count, 0); |
| 247 | } |
| 248 | |
| 249 | static int |
| 250 | net_write_prim (struct serial *scb, const void *buf, size_t count) |
| 251 | { |
| 252 | return send (scb->fd, buf, count, 0); |
| 253 | } |
| 254 | |
| 255 | void |
| 256 | _initialize_ser_tcp (void) |
| 257 | { |
| 258 | struct serial_ops *ops; |
| 259 | #ifdef USE_WIN32API |
| 260 | WSADATA wsa_data; |
| 261 | if (WSAStartup (MAKEWORD (1, 0), &wsa_data) != 0) |
| 262 | /* WinSock is unavailable. */ |
| 263 | return; |
| 264 | #endif |
| 265 | ops = XMALLOC (struct serial_ops); |
| 266 | memset (ops, 0, sizeof (struct serial_ops)); |
| 267 | ops->name = "tcp"; |
| 268 | ops->next = 0; |
| 269 | ops->open = net_open; |
| 270 | ops->close = net_close; |
| 271 | ops->readchar = ser_base_readchar; |
| 272 | ops->write = ser_base_write; |
| 273 | ops->flush_output = ser_base_flush_output; |
| 274 | ops->flush_input = ser_base_flush_input; |
| 275 | ops->send_break = ser_base_send_break; |
| 276 | ops->go_raw = ser_base_raw; |
| 277 | ops->get_tty_state = ser_base_get_tty_state; |
| 278 | ops->set_tty_state = ser_base_set_tty_state; |
| 279 | ops->print_tty_state = ser_base_print_tty_state; |
| 280 | ops->noflush_set_tty_state = ser_base_noflush_set_tty_state; |
| 281 | ops->setbaudrate = ser_base_setbaudrate; |
| 282 | ops->setstopbits = ser_base_setstopbits; |
| 283 | ops->drain_output = ser_base_drain_output; |
| 284 | ops->async = ser_base_async; |
| 285 | ops->read_prim = net_read_prim; |
| 286 | ops->write_prim = net_write_prim; |
| 287 | serial_add_interface (ops); |
| 288 | } |