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