gdb/ser-tcp.c

   1 /* Serial interface for raw TCP connections on Un*x like systems
   2    Copyright 1992, 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21 #include "serial.h"
  22 #include <sys/types.h>
  23 #include <sys/time.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26 #include <netdb.h>
  27 #include <sys/socket.h>
  28 #include <netinet/tcp.h>
  29 #include "signals.h"
  30
  31 struct tcp_ttystate
  32 {
  33   int bogus;
  34 };
  35
  36 static int tcp_open PARAMS ((serial_t scb, const char *name));
  37 static void tcp_raw PARAMS ((serial_t scb));
  38 static int wait_for PARAMS ((serial_t scb, int timeout));
  39 static int tcp_readchar PARAMS ((serial_t scb, int timeout));
  40 static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
  41 static int tcp_setstopbits PARAMS ((serial_t scb, int num));
  42 static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
  43 /* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */
  44 static void tcp_close PARAMS ((serial_t scb));
  45 static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
  46 static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
  47
  48 /* Open up a raw tcp socket */
  49
  50 static int
  51 tcp_open(scb, name)
  52      serial_t scb;
  53      const char *name;
  54 {
  55   char *port_str;
  56   int port;
  57   struct hostent *hostent;
  58   struct sockaddr_in sockaddr;
  59   int tmp;
  60   char hostname[100];
  61   struct protoent *protoent;
  62
  63   port_str = strchr (name, ':');
  64
  65   if (!port_str)
  66     error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
  67
  68   tmp = min (port_str - name, sizeof hostname - 1);
  69   strncpy (hostname, name, tmp); /* Don't want colon */
  70   hostname[tmp] = '\000';       /* Tie off host name */
  71   port = atoi (port_str + 1);
  72
  73   hostent = gethostbyname (hostname);
  74
  75   if (!hostent)
  76     {
  77       fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
  78       errno = ENOENT;
  79       return -1;
  80     }
  81
  82   scb->fd = socket (PF_INET, SOCK_STREAM, 0);
  83   if (scb->fd < 0)
  84     return -1;
  85
  86   /* Allow rapid reuse of this port. */
  87   tmp = 1;
  88   setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));
  89
  90   /* Enable TCP keep alive process. */
  91   tmp = 1;
  92   setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
  93
  94   sockaddr.sin_family = PF_INET;
  95   sockaddr.sin_port = htons(port);
  96   memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
  97           sizeof (struct in_addr));
  98
  99   if (connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr)))
 100     {
 101       close(scb->fd);
 102       scb->fd = -1;
 103       return -1;
 104     }
 105
 106   protoent = getprotobyname ("tcp");
 107   if (!protoent)
 108     return -1;
 109
 110   tmp = 1;
 111   if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
 112                   (char *)&tmp, sizeof(tmp)))
 113     return -1;
 114
 115   signal(SIGPIPE, SIG_IGN);     /* If we don't do this, then GDB simply exits
 116                                    when the remote side dies.  */
 117
 118   return 0;
 119 }
 120
 121 static serial_ttystate
 122 tcp_get_tty_state(scb)
 123      serial_t scb;
 124 {
 125   struct tcp_ttystate *state;
 126
 127   state = (struct tcp_ttystate *)xmalloc(sizeof *state);
 128
 129   return (serial_ttystate)state;
 130 }
 131
 132 static int
 133 tcp_set_tty_state(scb, ttystate)
 134      serial_t scb;
 135      serial_ttystate ttystate;
 136 {
 137   struct tcp_ttystate *state;
 138
 139   state = (struct tcp_ttystate *)ttystate;
 140
 141   return 0;
 142 }
 143
 144 static int
 145 tcp_return_0 (scb)
 146      serial_t scb;
 147 {
 148   return 0;
 149 }
 150
 151 static void
 152 tcp_raw(scb)
 153      serial_t scb;
 154 {
 155   return;                       /* Always in raw mode */
 156 }
 157
 158 /* Wait for input on scb, with timeout seconds.  Returns 0 on success,
 159    otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
 160
 161    For termio{s}, we actually just setup VTIME if necessary, and let the
 162    timeout occur in the read() in tcp_read().
 163  */
 164
 165 static int
 166 wait_for(scb, timeout)
 167      serial_t scb;
 168      int timeout;
 169 {
 170   int numfds;
 171   struct timeval tv;
 172   fd_set readfds, exceptfds;
 173
 174   FD_ZERO (&readfds);
 175   FD_ZERO (&exceptfds);
 176
 177   tv.tv_sec = timeout;
 178   tv.tv_usec = 0;
 179
 180   FD_SET(scb->fd, &readfds);
 181   FD_SET(scb->fd, &exceptfds);
 182
 183   while (1)
 184     {
 185       if (timeout >= 0)
 186         numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
 187       else
 188         numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);
 189
 190       if (numfds <= 0)
 191         if (numfds == 0)
 192           return SERIAL_TIMEOUT;
 193         else if (errno == EINTR)
 194           continue;
 195         else
 196           return SERIAL_ERROR;  /* Got an error from select or poll */
 197
 198       return 0;
 199     }
 200 }
 201
 202 /* Read a character with user-specified timeout.  TIMEOUT is number of seconds
 203    to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
 204    char if successful.  Returns -2 if timeout expired, EOF if line dropped
 205    dead, or -3 for any other error (see errno in that case). */
 206
 207 static int
 208 tcp_readchar(scb, timeout)
 209      serial_t scb;
 210      int timeout;
 211 {
 212   int status;
 213
 214   if (scb->bufcnt-- > 0)
 215     return *scb->bufp++;
 216
 217   status = wait_for(scb, timeout);
 218
 219   if (status < 0)
 220     return status;
 221
 222   while (1)
 223     {
 224       scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
 225       if (scb->bufcnt != -1 || errno != EINTR)
 226         break;
 227     }
 228
 229   if (scb->bufcnt <= 0)
 230     if (scb->bufcnt == 0)
 231       return SERIAL_TIMEOUT;    /* 0 chars means timeout [may need to
 232                                    distinguish between EOF & timeouts
 233                                    someday] */
 234     else
 235       return SERIAL_ERROR;      /* Got an error from read */
 236
 237   scb->bufcnt--;
 238   scb->bufp = scb->buf;
 239   return *scb->bufp++;
 240 }
 241
 242 static int
 243 tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
 244      serial_t scb;
 245      serial_ttystate new_ttystate;
 246      serial_ttystate old_ttystate;
 247 {
 248   return 0;
 249 }
 250
 251 static void
 252 tcp_print_tty_state (scb, ttystate)
 253      serial_t scb;
 254      serial_ttystate ttystate;
 255 {
 256   /* Nothing to print.  */
 257   return;
 258 }
 259
 260 static int
 261 tcp_setbaudrate(scb, rate)
 262      serial_t scb;
 263      int rate;
 264 {
 265   return 0;                     /* Never fails! */
 266 }
 267
 268 static int
 269 tcp_setstopbits(scb, num)
 270      serial_t scb;
 271      int num;
 272 {
 273   return 0;                     /* Never fails! */
 274 }
 275
 276 static int
 277 tcp_write(scb, str, len)
 278      serial_t scb;
 279      const char *str;
 280      int len;
 281 {
 282   int cc;
 283
 284   while (len > 0)
 285     {
 286       cc = write(scb->fd, str, len);
 287
 288       if (cc < 0)
 289         return 1;
 290       len -= cc;
 291       str += cc;
 292     }
 293   return 0;
 294 }
 295
 296 static void
 297 tcp_close(scb)
 298      serial_t scb;
 299 {
 300   if (scb->fd < 0)
 301     return;
 302
 303   close(scb->fd);
 304   scb->fd = -1;
 305 }
 306
 307 static struct serial_ops tcp_ops =
 308 {
 309   "tcp",
 310   0,
 311   tcp_open,
 312   tcp_close,
 313   tcp_readchar,
 314   tcp_write,
 315   tcp_return_0, /* flush output */
 316   tcp_return_0, /* flush input */
 317   tcp_return_0, /* send break */
 318   tcp_raw,
 319   tcp_get_tty_state,
 320   tcp_set_tty_state,
 321   tcp_print_tty_state,
 322   tcp_noflush_set_tty_state,
 323   tcp_setbaudrate,
 324   tcp_setstopbits,
 325 };
 326
 327 void
 328 _initialize_ser_tcp ()
 329 {
 330   serial_add_interface (&tcp_ops);
 331 }