Commit | Line | Data |
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c906108c | 1 | /* Serial interface for raw TCP connections on Un*x like systems |
43ff13b4 | 2 | Copyright 1992, 1993, 1998, 1999 Free Software Foundation, Inc. |
c906108c SS |
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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> | |
7a292a7a SS |
28 | #ifdef HAVE_UNISTD_H |
29 | #include <unistd.h> | |
30 | #endif | |
c906108c SS |
31 | |
32 | #ifndef __CYGWIN32__ | |
33 | #include <netinet/tcp.h> | |
34 | #endif | |
35 | ||
43ff13b4 JM |
36 | #ifdef HAVE_SYS_SELECT_H |
37 | #include <sys/select.h> | |
38 | #endif | |
39 | ||
c906108c SS |
40 | #include "signals.h" |
41 | #include "gdb_string.h" | |
42 | ||
7a292a7a SS |
43 | extern int (*ui_loop_hook) PARAMS ((int)); |
44 | ||
c906108c SS |
45 | struct tcp_ttystate |
46 | { | |
47 | int bogus; | |
48 | }; | |
49 | ||
50 | static int tcp_open PARAMS ((serial_t scb, const char *name)); | |
51 | static void tcp_raw PARAMS ((serial_t scb)); | |
52 | static int wait_for PARAMS ((serial_t scb, int timeout)); | |
53 | static int tcp_readchar PARAMS ((serial_t scb, int timeout)); | |
54 | static int tcp_setbaudrate PARAMS ((serial_t scb, int rate)); | |
55 | static int tcp_setstopbits PARAMS ((serial_t scb, int num)); | |
56 | static int tcp_write PARAMS ((serial_t scb, const char *str, int len)); | |
57 | /* FIXME: static void tcp_restore PARAMS ((serial_t scb)); */ | |
58 | static void tcp_close PARAMS ((serial_t scb)); | |
59 | static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb)); | |
60 | static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); | |
61 | static int tcp_return_0 PARAMS ((serial_t)); | |
62 | static int tcp_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate, | |
63 | serial_ttystate)); | |
64 | static void tcp_print_tty_state PARAMS ((serial_t, serial_ttystate)); | |
65 | ||
66 | void _initialize_ser_tcp PARAMS ((void)); | |
67 | ||
68 | /* Open up a raw tcp socket */ | |
69 | ||
70 | static int | |
71 | tcp_open(scb, name) | |
72 | serial_t scb; | |
73 | const char *name; | |
74 | { | |
75 | char *port_str; | |
76 | int port; | |
77 | struct hostent *hostent; | |
78 | struct sockaddr_in sockaddr; | |
79 | int tmp; | |
80 | char hostname[100]; | |
81 | struct protoent *protoent; | |
82 | int i; | |
83 | ||
84 | port_str = strchr (name, ':'); | |
85 | ||
86 | if (!port_str) | |
87 | error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */ | |
88 | ||
89 | tmp = min (port_str - name, (int) sizeof hostname - 1); | |
90 | strncpy (hostname, name, tmp); /* Don't want colon */ | |
91 | hostname[tmp] = '\000'; /* Tie off host name */ | |
92 | port = atoi (port_str + 1); | |
93 | ||
94 | hostent = gethostbyname (hostname); | |
95 | ||
96 | if (!hostent) | |
97 | { | |
98 | fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname); | |
99 | errno = ENOENT; | |
100 | return -1; | |
101 | } | |
102 | ||
103 | for (i = 1; i <= 15; i++) | |
104 | { | |
105 | scb->fd = socket (PF_INET, SOCK_STREAM, 0); | |
106 | if (scb->fd < 0) | |
107 | return -1; | |
108 | ||
109 | /* Allow rapid reuse of this port. */ | |
110 | tmp = 1; | |
111 | setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp)); | |
112 | ||
113 | /* Enable TCP keep alive process. */ | |
114 | tmp = 1; | |
115 | setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp)); | |
116 | ||
117 | sockaddr.sin_family = PF_INET; | |
118 | sockaddr.sin_port = htons(port); | |
119 | memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, | |
120 | sizeof (struct in_addr)); | |
121 | ||
122 | if (!connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof(sockaddr))) | |
123 | break; | |
124 | ||
125 | close (scb->fd); | |
126 | scb->fd = -1; | |
127 | ||
128 | /* We retry for ECONNREFUSED because that is often a temporary condition, which | |
129 | happens when the server is being restarted. */ | |
130 | ||
131 | if (errno != ECONNREFUSED) | |
132 | return -1; | |
133 | ||
134 | sleep (1); | |
135 | } | |
136 | ||
137 | protoent = getprotobyname ("tcp"); | |
138 | if (!protoent) | |
139 | return -1; | |
140 | ||
141 | tmp = 1; | |
142 | if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY, | |
143 | (char *)&tmp, sizeof(tmp))) | |
144 | return -1; | |
145 | ||
146 | signal(SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits | |
147 | when the remote side dies. */ | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static serial_ttystate | |
153 | tcp_get_tty_state(scb) | |
154 | serial_t scb; | |
155 | { | |
156 | struct tcp_ttystate *state; | |
157 | ||
158 | state = (struct tcp_ttystate *)xmalloc(sizeof *state); | |
159 | ||
160 | return (serial_ttystate)state; | |
161 | } | |
162 | ||
163 | static int | |
164 | tcp_set_tty_state(scb, ttystate) | |
165 | serial_t scb; | |
166 | serial_ttystate ttystate; | |
167 | { | |
168 | struct tcp_ttystate *state; | |
169 | ||
170 | state = (struct tcp_ttystate *)ttystate; | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static int | |
176 | tcp_return_0 (scb) | |
177 | serial_t scb; | |
178 | { | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static void | |
183 | tcp_raw(scb) | |
184 | serial_t scb; | |
185 | { | |
186 | return; /* Always in raw mode */ | |
187 | } | |
188 | ||
189 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, | |
190 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. | |
191 | ||
192 | For termio{s}, we actually just setup VTIME if necessary, and let the | |
193 | timeout occur in the read() in tcp_read(). | |
194 | */ | |
195 | ||
196 | static int | |
197 | wait_for (scb, timeout) | |
198 | serial_t scb; | |
199 | int timeout; | |
200 | { | |
201 | int numfds; | |
202 | struct timeval tv; | |
203 | fd_set readfds, exceptfds; | |
204 | ||
205 | FD_ZERO (&readfds); | |
206 | FD_ZERO (&exceptfds); | |
207 | ||
208 | tv.tv_sec = timeout; | |
209 | tv.tv_usec = 0; | |
210 | ||
211 | FD_SET(scb->fd, &readfds); | |
212 | FD_SET(scb->fd, &exceptfds); | |
213 | ||
214 | while (1) | |
215 | { | |
216 | if (timeout >= 0) | |
217 | numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv); | |
218 | else | |
219 | numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0); | |
220 | ||
221 | if (numfds <= 0) | |
222 | { | |
223 | if (numfds == 0) | |
224 | return SERIAL_TIMEOUT; | |
225 | else if (errno == EINTR) | |
226 | continue; | |
227 | else | |
228 | return SERIAL_ERROR; /* Got an error from select or poll */ | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | } | |
234 | ||
235 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds | |
236 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns | |
237 | char if successful. Returns -2 if timeout expired, EOF if line dropped | |
238 | dead, or -3 for any other error (see errno in that case). */ | |
239 | ||
240 | static int | |
241 | tcp_readchar (scb, timeout) | |
242 | serial_t scb; | |
243 | int timeout; | |
244 | { | |
245 | int status; | |
7a292a7a | 246 | int delta; |
c906108c SS |
247 | |
248 | if (scb->bufcnt-- > 0) | |
249 | return *scb->bufp++; | |
250 | ||
7a292a7a SS |
251 | /* We have to be able to keep the GUI alive here, so we break the original |
252 | timeout into steps of 1 second, running the "keep the GUI alive" hook | |
253 | each time through the loop. | |
254 | ||
255 | Also, timeout = 0 means to poll, so we just set the delta to 0, so we | |
256 | will only go through the loop once. */ | |
257 | ||
258 | delta = (timeout == 0 ? 0 : 1); | |
259 | while (1) | |
260 | { | |
261 | ||
262 | /* N.B. The UI may destroy our world (for instance by calling | |
263 | remote_stop,) in which case we want to get out of here as | |
264 | quickly as possible. It is not safe to touch scb, since | |
265 | someone else might have freed it. The ui_loop_hook signals that | |
266 | we should exit by returning 1. */ | |
267 | ||
268 | if (ui_loop_hook) | |
269 | { | |
270 | if (ui_loop_hook (0)) | |
271 | return SERIAL_TIMEOUT; | |
272 | } | |
273 | ||
274 | status = wait_for (scb, delta); | |
275 | timeout -= delta; | |
276 | ||
277 | /* If we got a character or an error back from wait_for, then we can | |
278 | break from the loop before the timeout is completed. */ | |
279 | ||
280 | if (status != SERIAL_TIMEOUT) | |
281 | { | |
282 | break; | |
283 | } | |
284 | ||
285 | /* If we have exhausted the original timeout, then generate | |
286 | a SERIAL_TIMEOUT, and pass it out of the loop. */ | |
287 | ||
288 | else if (timeout == 0) | |
289 | { | |
290 | status == SERIAL_TIMEOUT; | |
291 | break; | |
292 | } | |
293 | } | |
c906108c SS |
294 | |
295 | if (status < 0) | |
296 | return status; | |
297 | ||
298 | while (1) | |
299 | { | |
300 | scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ); | |
301 | if (scb->bufcnt != -1 || errno != EINTR) | |
302 | break; | |
303 | } | |
304 | ||
305 | if (scb->bufcnt <= 0) | |
306 | { | |
307 | if (scb->bufcnt == 0) | |
308 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to | |
309 | distinguish between EOF & timeouts | |
310 | someday] */ | |
311 | else | |
312 | return SERIAL_ERROR; /* Got an error from read */ | |
313 | } | |
314 | ||
315 | scb->bufcnt--; | |
316 | scb->bufp = scb->buf; | |
317 | return *scb->bufp++; | |
318 | } | |
319 | ||
320 | static int | |
321 | tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate) | |
322 | serial_t scb; | |
323 | serial_ttystate new_ttystate; | |
324 | serial_ttystate old_ttystate; | |
325 | { | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static void | |
330 | tcp_print_tty_state (scb, ttystate) | |
331 | serial_t scb; | |
332 | serial_ttystate ttystate; | |
333 | { | |
334 | /* Nothing to print. */ | |
335 | return; | |
336 | } | |
337 | ||
338 | static int | |
339 | tcp_setbaudrate(scb, rate) | |
340 | serial_t scb; | |
341 | int rate; | |
342 | { | |
343 | return 0; /* Never fails! */ | |
344 | } | |
345 | ||
346 | static int | |
347 | tcp_setstopbits(scb, num) | |
348 | serial_t scb; | |
349 | int num; | |
350 | { | |
351 | return 0; /* Never fails! */ | |
352 | } | |
353 | ||
354 | static int | |
355 | tcp_write(scb, str, len) | |
356 | serial_t scb; | |
357 | const char *str; | |
358 | int len; | |
359 | { | |
360 | int cc; | |
361 | ||
362 | while (len > 0) | |
363 | { | |
364 | cc = write(scb->fd, str, len); | |
365 | ||
366 | if (cc < 0) | |
367 | return 1; | |
368 | len -= cc; | |
369 | str += cc; | |
370 | } | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static void | |
375 | tcp_close(scb) | |
376 | serial_t scb; | |
377 | { | |
378 | if (scb->fd < 0) | |
379 | return; | |
380 | ||
381 | close(scb->fd); | |
382 | scb->fd = -1; | |
383 | } | |
384 | ||
385 | static struct serial_ops tcp_ops = | |
386 | { | |
387 | "tcp", | |
388 | 0, | |
389 | tcp_open, | |
390 | tcp_close, | |
391 | tcp_readchar, | |
392 | tcp_write, | |
393 | tcp_return_0, /* flush output */ | |
394 | tcp_return_0, /* flush input */ | |
395 | tcp_return_0, /* send break */ | |
396 | tcp_raw, | |
397 | tcp_get_tty_state, | |
398 | tcp_set_tty_state, | |
399 | tcp_print_tty_state, | |
400 | tcp_noflush_set_tty_state, | |
401 | tcp_setbaudrate, | |
402 | tcp_setstopbits, | |
403 | tcp_return_0, /* wait for output to drain */ | |
404 | }; | |
405 | ||
406 | void | |
407 | _initialize_ser_tcp () | |
408 | { | |
409 | serial_add_interface (&tcp_ops); | |
410 | } |