Commit | Line | Data |
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c906108c | 1 | /* Serial interface for raw TCP connections on Un*x like systems |
9846de1b | 2 | Copyright 1992, 1993, 1998 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "serial.h" | |
23 | #include <sys/types.h> | |
24 | #include <sys/time.h> | |
25 | #include <netinet/in.h> | |
26 | #include <arpa/inet.h> | |
27 | #include <netdb.h> | |
28 | #include <sys/socket.h> | |
7a292a7a SS |
29 | #ifdef HAVE_UNISTD_H |
30 | #include <unistd.h> | |
31 | #endif | |
c906108c SS |
32 | |
33 | #ifndef __CYGWIN32__ | |
34 | #include <netinet/tcp.h> | |
35 | #endif | |
36 | ||
37 | #include "signals.h" | |
38 | #include "gdb_string.h" | |
39 | ||
7a292a7a SS |
40 | extern int (*ui_loop_hook) PARAMS ((int)); |
41 | ||
c906108c | 42 | struct tcp_ttystate |
c5aa993b JM |
43 | { |
44 | int bogus; | |
45 | }; | |
c906108c SS |
46 | |
47 | static int tcp_open PARAMS ((serial_t scb, const char *name)); | |
48 | static void tcp_raw PARAMS ((serial_t scb)); | |
49 | static int wait_for PARAMS ((serial_t scb, int timeout)); | |
50 | static int tcp_readchar PARAMS ((serial_t scb, int timeout)); | |
51 | static int tcp_setbaudrate PARAMS ((serial_t scb, int rate)); | |
52 | static int tcp_setstopbits PARAMS ((serial_t scb, int num)); | |
53 | static int tcp_write PARAMS ((serial_t scb, const char *str, int len)); | |
54 | /* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */ | |
55 | static void tcp_close PARAMS ((serial_t scb)); | |
56 | static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb)); | |
57 | static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); | |
58 | static int tcp_return_0 PARAMS ((serial_t)); | |
59 | static int tcp_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate, | |
60 | serial_ttystate)); | |
61 | static void tcp_print_tty_state PARAMS ((serial_t, serial_ttystate)); | |
62 | ||
63 | void _initialize_ser_tcp PARAMS ((void)); | |
64 | ||
65 | /* Open up a raw tcp socket */ | |
66 | ||
67 | static int | |
c5aa993b | 68 | tcp_open (scb, name) |
c906108c SS |
69 | serial_t scb; |
70 | const char *name; | |
71 | { | |
72 | char *port_str; | |
73 | int port; | |
74 | struct hostent *hostent; | |
75 | struct sockaddr_in sockaddr; | |
76 | int tmp; | |
77 | char hostname[100]; | |
78 | struct protoent *protoent; | |
79 | int i; | |
80 | ||
81 | port_str = strchr (name, ':'); | |
82 | ||
83 | if (!port_str) | |
c5aa993b | 84 | error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */ |
c906108c SS |
85 | |
86 | tmp = min (port_str - name, (int) sizeof hostname - 1); | |
c5aa993b | 87 | strncpy (hostname, name, tmp); /* Don't want colon */ |
c906108c SS |
88 | hostname[tmp] = '\000'; /* Tie off host name */ |
89 | port = atoi (port_str + 1); | |
90 | ||
91 | hostent = gethostbyname (hostname); | |
92 | ||
93 | if (!hostent) | |
94 | { | |
95 | fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname); | |
96 | errno = ENOENT; | |
97 | return -1; | |
98 | } | |
99 | ||
100 | for (i = 1; i <= 15; i++) | |
101 | { | |
102 | scb->fd = socket (PF_INET, SOCK_STREAM, 0); | |
103 | if (scb->fd < 0) | |
104 | return -1; | |
105 | ||
106 | /* Allow rapid reuse of this port. */ | |
107 | tmp = 1; | |
c5aa993b | 108 | setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, sizeof (tmp)); |
c906108c SS |
109 | |
110 | /* Enable TCP keep alive process. */ | |
111 | tmp = 1; | |
c5aa993b | 112 | setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp)); |
c906108c SS |
113 | |
114 | sockaddr.sin_family = PF_INET; | |
c5aa993b | 115 | sockaddr.sin_port = htons (port); |
c906108c SS |
116 | memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, |
117 | sizeof (struct in_addr)); | |
118 | ||
c5aa993b | 119 | if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr))) |
c906108c SS |
120 | break; |
121 | ||
122 | close (scb->fd); | |
123 | scb->fd = -1; | |
124 | ||
125 | /* We retry for ECONNREFUSED because that is often a temporary condition, which | |
126 | happens when the server is being restarted. */ | |
127 | ||
128 | if (errno != ECONNREFUSED) | |
129 | return -1; | |
130 | ||
131 | sleep (1); | |
132 | } | |
133 | ||
134 | protoent = getprotobyname ("tcp"); | |
135 | if (!protoent) | |
136 | return -1; | |
137 | ||
138 | tmp = 1; | |
139 | if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY, | |
c5aa993b | 140 | (char *) &tmp, sizeof (tmp))) |
c906108c SS |
141 | return -1; |
142 | ||
c5aa993b | 143 | signal (SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits |
c906108c SS |
144 | when the remote side dies. */ |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static serial_ttystate | |
c5aa993b | 150 | tcp_get_tty_state (scb) |
c906108c SS |
151 | serial_t scb; |
152 | { | |
153 | struct tcp_ttystate *state; | |
154 | ||
c5aa993b | 155 | state = (struct tcp_ttystate *) xmalloc (sizeof *state); |
c906108c | 156 | |
c5aa993b | 157 | return (serial_ttystate) state; |
c906108c SS |
158 | } |
159 | ||
160 | static int | |
c5aa993b | 161 | tcp_set_tty_state (scb, ttystate) |
c906108c SS |
162 | serial_t scb; |
163 | serial_ttystate ttystate; | |
164 | { | |
165 | struct tcp_ttystate *state; | |
166 | ||
c5aa993b | 167 | state = (struct tcp_ttystate *) ttystate; |
c906108c SS |
168 | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static int | |
173 | tcp_return_0 (scb) | |
174 | serial_t scb; | |
175 | { | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static void | |
c5aa993b | 180 | tcp_raw (scb) |
c906108c SS |
181 | serial_t scb; |
182 | { | |
183 | return; /* Always in raw mode */ | |
184 | } | |
185 | ||
186 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, | |
187 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. | |
188 | ||
189 | For termio{s}, we actually just setup VTIME if necessary, and let the | |
190 | timeout occur in the read() in tcp_read(). | |
191 | */ | |
192 | ||
193 | static int | |
194 | wait_for (scb, timeout) | |
195 | serial_t scb; | |
196 | int timeout; | |
197 | { | |
198 | int numfds; | |
199 | struct timeval tv; | |
200 | fd_set readfds, exceptfds; | |
201 | ||
202 | FD_ZERO (&readfds); | |
203 | FD_ZERO (&exceptfds); | |
204 | ||
205 | tv.tv_sec = timeout; | |
206 | tv.tv_usec = 0; | |
207 | ||
c5aa993b JM |
208 | FD_SET (scb->fd, &readfds); |
209 | FD_SET (scb->fd, &exceptfds); | |
c906108c SS |
210 | |
211 | while (1) | |
212 | { | |
213 | if (timeout >= 0) | |
c5aa993b | 214 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv); |
c906108c | 215 | else |
c5aa993b | 216 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0); |
c906108c SS |
217 | |
218 | if (numfds <= 0) | |
c5aa993b | 219 | { |
c906108c SS |
220 | if (numfds == 0) |
221 | return SERIAL_TIMEOUT; | |
222 | else if (errno == EINTR) | |
223 | continue; | |
224 | else | |
225 | return SERIAL_ERROR; /* Got an error from select or poll */ | |
c5aa993b | 226 | } |
c906108c SS |
227 | |
228 | return 0; | |
229 | } | |
230 | } | |
231 | ||
232 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds | |
233 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns | |
234 | char if successful. Returns -2 if timeout expired, EOF if line dropped | |
235 | dead, or -3 for any other error (see errno in that case). */ | |
236 | ||
237 | static int | |
238 | tcp_readchar (scb, timeout) | |
239 | serial_t scb; | |
240 | int timeout; | |
241 | { | |
242 | int status; | |
7a292a7a | 243 | int delta; |
c906108c SS |
244 | |
245 | if (scb->bufcnt-- > 0) | |
246 | return *scb->bufp++; | |
247 | ||
7a292a7a SS |
248 | /* We have to be able to keep the GUI alive here, so we break the original |
249 | timeout into steps of 1 second, running the "keep the GUI alive" hook | |
250 | each time through the loop. | |
251 | ||
252 | Also, timeout = 0 means to poll, so we just set the delta to 0, so we | |
253 | will only go through the loop once. */ | |
c5aa993b | 254 | |
7a292a7a SS |
255 | delta = (timeout == 0 ? 0 : 1); |
256 | while (1) | |
257 | { | |
258 | ||
259 | /* N.B. The UI may destroy our world (for instance by calling | |
c5aa993b JM |
260 | remote_stop,) in which case we want to get out of here as |
261 | quickly as possible. It is not safe to touch scb, since | |
262 | someone else might have freed it. The ui_loop_hook signals that | |
263 | we should exit by returning 1. */ | |
7a292a7a SS |
264 | |
265 | if (ui_loop_hook) | |
266 | { | |
267 | if (ui_loop_hook (0)) | |
268 | return SERIAL_TIMEOUT; | |
269 | } | |
270 | ||
271 | status = wait_for (scb, delta); | |
272 | timeout -= delta; | |
273 | ||
274 | /* If we got a character or an error back from wait_for, then we can | |
275 | break from the loop before the timeout is completed. */ | |
c5aa993b | 276 | |
7a292a7a SS |
277 | if (status != SERIAL_TIMEOUT) |
278 | { | |
279 | break; | |
280 | } | |
281 | ||
282 | /* If we have exhausted the original timeout, then generate | |
c5aa993b JM |
283 | a SERIAL_TIMEOUT, and pass it out of the loop. */ |
284 | ||
7a292a7a SS |
285 | else if (timeout == 0) |
286 | { | |
287 | status == SERIAL_TIMEOUT; | |
288 | break; | |
289 | } | |
290 | } | |
c906108c SS |
291 | |
292 | if (status < 0) | |
293 | return status; | |
294 | ||
295 | while (1) | |
296 | { | |
c5aa993b | 297 | scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ); |
c906108c SS |
298 | if (scb->bufcnt != -1 || errno != EINTR) |
299 | break; | |
300 | } | |
301 | ||
302 | if (scb->bufcnt <= 0) | |
303 | { | |
304 | if (scb->bufcnt == 0) | |
c5aa993b JM |
305 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to |
306 | distinguish between EOF & timeouts | |
307 | someday] */ | |
c906108c | 308 | else |
c5aa993b | 309 | return SERIAL_ERROR; /* Got an error from read */ |
c906108c SS |
310 | } |
311 | ||
312 | scb->bufcnt--; | |
313 | scb->bufp = scb->buf; | |
314 | return *scb->bufp++; | |
315 | } | |
316 | ||
317 | static int | |
318 | tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate) | |
319 | serial_t scb; | |
320 | serial_ttystate new_ttystate; | |
321 | serial_ttystate old_ttystate; | |
322 | { | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static void | |
327 | tcp_print_tty_state (scb, ttystate) | |
328 | serial_t scb; | |
329 | serial_ttystate ttystate; | |
330 | { | |
331 | /* Nothing to print. */ | |
332 | return; | |
333 | } | |
334 | ||
335 | static int | |
c5aa993b | 336 | tcp_setbaudrate (scb, rate) |
c906108c SS |
337 | serial_t scb; |
338 | int rate; | |
339 | { | |
340 | return 0; /* Never fails! */ | |
341 | } | |
342 | ||
343 | static int | |
c5aa993b | 344 | tcp_setstopbits (scb, num) |
c906108c SS |
345 | serial_t scb; |
346 | int num; | |
347 | { | |
348 | return 0; /* Never fails! */ | |
349 | } | |
350 | ||
351 | static int | |
c5aa993b | 352 | tcp_write (scb, str, len) |
c906108c SS |
353 | serial_t scb; |
354 | const char *str; | |
355 | int len; | |
356 | { | |
357 | int cc; | |
358 | ||
359 | while (len > 0) | |
360 | { | |
c5aa993b | 361 | cc = write (scb->fd, str, len); |
c906108c SS |
362 | |
363 | if (cc < 0) | |
364 | return 1; | |
365 | len -= cc; | |
366 | str += cc; | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static void | |
c5aa993b | 372 | tcp_close (scb) |
c906108c SS |
373 | serial_t scb; |
374 | { | |
375 | if (scb->fd < 0) | |
376 | return; | |
377 | ||
c5aa993b | 378 | close (scb->fd); |
c906108c SS |
379 | scb->fd = -1; |
380 | } | |
381 | ||
382 | static struct serial_ops tcp_ops = | |
383 | { | |
384 | "tcp", | |
385 | 0, | |
386 | tcp_open, | |
387 | tcp_close, | |
388 | tcp_readchar, | |
389 | tcp_write, | |
c5aa993b JM |
390 | tcp_return_0, /* flush output */ |
391 | tcp_return_0, /* flush input */ | |
392 | tcp_return_0, /* send break */ | |
c906108c SS |
393 | tcp_raw, |
394 | tcp_get_tty_state, | |
395 | tcp_set_tty_state, | |
396 | tcp_print_tty_state, | |
397 | tcp_noflush_set_tty_state, | |
398 | tcp_setbaudrate, | |
399 | tcp_setstopbits, | |
c5aa993b | 400 | tcp_return_0, /* wait for output to drain */ |
c906108c SS |
401 | }; |
402 | ||
403 | void | |
404 | _initialize_ser_tcp () | |
405 | { | |
406 | serial_add_interface (&tcp_ops); | |
407 | } |