Commit | Line | Data |
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38dc5e12 SG |
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_write PARAMS ((serial_t scb, const char *str, int len)); | |
42 | static void tcp_restore PARAMS ((serial_t scb)); | |
43 | static void tcp_close PARAMS ((serial_t scb)); | |
44 | static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb)); | |
45 | static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); | |
46 | ||
47 | /* Open up a raw tcp socket */ | |
48 | ||
49 | static int | |
50 | tcp_open(scb, name) | |
51 | serial_t scb; | |
52 | const char *name; | |
53 | { | |
54 | char *port_str; | |
55 | int port; | |
56 | struct hostent *hostent; | |
57 | struct sockaddr_in sockaddr; | |
58 | int tmp; | |
59 | char hostname[100]; | |
60 | ||
61 | port_str = strchr (name, ':'); | |
62 | ||
63 | if (!port_str) | |
64 | error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */ | |
65 | ||
66 | tmp = min(port_str - name + 1, sizeof hostname); | |
67 | strncpy (hostname, name, tmp - 1); /* Don't want colon */ | |
68 | port = atoi (port_str + 1); | |
69 | ||
70 | hostent = gethostbyname (hostname); | |
71 | ||
72 | if (!hostent) | |
73 | { | |
74 | errno = ENOENT; | |
75 | return -1; | |
76 | } | |
77 | ||
78 | scb->fd = socket (PF_INET, SOCK_STREAM, 0); | |
79 | if (scb->fd < 0) | |
80 | return -1; | |
81 | ||
82 | /* Allow rapid reuse of this port. */ | |
83 | tmp = 1; | |
84 | setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp)); | |
85 | ||
86 | /* Enable TCP keep alive process. */ | |
87 | tmp = 1; | |
88 | setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp)); | |
89 | ||
90 | sockaddr.sin_family = PF_INET; | |
91 | sockaddr.sin_port = htons(port); | |
92 | memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr, | |
93 | sizeof (struct in_addr)); | |
94 | ||
95 | if (connect(scb->fd, &sockaddr, sizeof(sockaddr))) | |
96 | { | |
97 | close(scb->fd); | |
98 | return -1; | |
99 | } | |
100 | ||
101 | tmp = 1; | |
102 | if (setsockopt (scb->fd, 6, TCP_NODELAY, (char *)&tmp, sizeof(tmp))) | |
103 | return -1; | |
104 | ||
105 | signal(SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits | |
106 | when the remote side dies. */ | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static serial_ttystate | |
112 | tcp_get_tty_state(scb) | |
113 | serial_t scb; | |
114 | { | |
115 | struct tcp_ttystate *state; | |
116 | ||
117 | state = (struct tcp_ttystate *)xmalloc(sizeof *state); | |
118 | ||
119 | return (serial_ttystate)state; | |
120 | } | |
121 | ||
122 | static int | |
123 | tcp_set_tty_state(scb, ttystate) | |
124 | serial_t scb; | |
125 | serial_ttystate ttystate; | |
126 | { | |
127 | struct tcp_ttystate *state; | |
128 | ||
129 | state = (struct tcp_ttystate *)ttystate; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | static void | |
135 | tcp_raw(scb) | |
136 | serial_t scb; | |
137 | { | |
138 | return; /* Always in raw mode */ | |
139 | } | |
140 | ||
141 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, | |
142 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. | |
143 | ||
144 | For termio{s}, we actually just setup VTIME if necessary, and let the | |
145 | timeout occur in the read() in tcp_read(). | |
146 | */ | |
147 | ||
148 | static int | |
149 | wait_for(scb, timeout) | |
150 | serial_t scb; | |
151 | int timeout; | |
152 | { | |
153 | int numfds; | |
154 | struct timeval tv; | |
155 | fd_set readfds; | |
156 | ||
157 | FD_ZERO (&readfds); | |
158 | ||
159 | tv.tv_sec = timeout; | |
160 | tv.tv_usec = 0; | |
161 | ||
162 | FD_SET(scb->fd, &readfds); | |
163 | ||
164 | if (timeout >= 0) | |
165 | numfds = select(scb->fd+1, &readfds, 0, 0, &tv); | |
166 | else | |
167 | numfds = select(scb->fd+1, &readfds, 0, 0, 0); | |
168 | ||
169 | if (numfds <= 0) | |
170 | if (numfds == 0) | |
171 | return SERIAL_TIMEOUT; | |
172 | else | |
173 | return SERIAL_ERROR; /* Got an error from select or poll */ | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds | |
179 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns | |
180 | char if successful. Returns -2 if timeout expired, EOF if line dropped | |
181 | dead, or -3 for any other error (see errno in that case). */ | |
182 | ||
183 | static int | |
184 | tcp_readchar(scb, timeout) | |
185 | serial_t scb; | |
186 | int timeout; | |
187 | { | |
188 | int status; | |
189 | ||
190 | if (scb->bufcnt-- > 0) | |
191 | return *scb->bufp++; | |
192 | ||
193 | status = wait_for(scb, timeout); | |
194 | ||
195 | if (status < 0) | |
196 | return status; | |
197 | ||
198 | scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ); | |
199 | ||
200 | if (scb->bufcnt <= 0) | |
201 | if (scb->bufcnt == 0) | |
202 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to | |
203 | distinguish between EOF & timeouts | |
204 | someday] */ | |
205 | else | |
206 | return SERIAL_ERROR; /* Got an error from read */ | |
207 | ||
208 | scb->bufcnt--; | |
209 | scb->bufp = scb->buf; | |
210 | return *scb->bufp++; | |
211 | } | |
212 | ||
213 | static int | |
214 | tcp_setbaudrate(scb, rate) | |
215 | serial_t scb; | |
216 | int rate; | |
217 | { | |
218 | return 0; /* Never fails! */ | |
219 | } | |
220 | ||
221 | static int | |
222 | tcp_write(scb, str, len) | |
223 | serial_t scb; | |
224 | const char *str; | |
225 | int len; | |
226 | { | |
227 | int cc; | |
228 | ||
229 | while (len > 0) | |
230 | { | |
231 | cc = write(scb->fd, str, len); | |
232 | ||
233 | if (cc < 0) | |
234 | return 1; | |
235 | len -= cc; | |
236 | str += cc; | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static void | |
242 | tcp_close(scb) | |
243 | serial_t scb; | |
244 | { | |
245 | if (scb->fd < 0) | |
246 | return; | |
247 | ||
248 | close(scb->fd); | |
249 | scb->fd = -1; | |
250 | } | |
251 | ||
252 | static struct serial_ops tcp_ops = | |
253 | { | |
254 | "tcp", | |
255 | 0, | |
256 | tcp_open, | |
257 | tcp_close, | |
258 | tcp_readchar, | |
259 | tcp_write, | |
260 | tcp_raw, | |
261 | tcp_get_tty_state, | |
262 | tcp_set_tty_state, | |
263 | tcp_setbaudrate, | |
264 | }; | |
265 | ||
266 | void | |
267 | _initialize_ser_tcp () | |
268 | { | |
269 | serial_add_interface (&tcp_ops); | |
270 | } |