Annotation of src/usr.bin/cu/cu.c, Revision 1.11
1.11 ! halex 1: /* $OpenBSD: cu.c,v 1.10 2012/07/13 05:29:01 dlg Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/param.h>
20: #include <sys/ioctl.h>
21:
1.11 ! halex 22: #include <ctype.h>
1.1 nicm 23: #include <err.h>
24: #include <event.h>
25: #include <fcntl.h>
26: #include <getopt.h>
27: #include <paths.h>
28: #include <pwd.h>
29: #include <signal.h>
30: #include <stdio.h>
31: #include <stdlib.h>
32: #include <string.h>
33: #include <termios.h>
34: #include <unistd.h>
35:
36: #include "cu.h"
37:
38: extern char *__progname;
39:
1.6 nicm 40: FILE *record_file;
1.1 nicm 41: struct termios saved_tio;
42: struct bufferevent *input_ev;
43: struct bufferevent *output_ev;
44: int line_fd;
45: struct bufferevent *line_ev;
46: struct event sigterm_ev;
1.8 nicm 47: struct event sighup_ev;
1.1 nicm 48: enum {
49: STATE_NONE,
50: STATE_NEWLINE,
51: STATE_TILDE
52: } last_state = STATE_NEWLINE;
53:
54: __dead void usage(void);
55: void signal_event(int, short, void *);
56: void stream_read(struct bufferevent *, void *);
57: void stream_error(struct bufferevent *, short, void *);
58: void line_read(struct bufferevent *, void *);
59: void line_error(struct bufferevent *, short, void *);
60:
61: __dead void
62: usage(void)
63: {
1.7 nicm 64: fprintf(stderr, "usage: %s [-l line] [-s speed | -speed]\n",
65: __progname);
1.1 nicm 66: exit(1);
67: }
68:
69: int
70: main(int argc, char **argv)
71: {
72: const char *line, *errstr;
73: char *tmp;
1.11 ! halex 74: int opt, speed, i;
1.1 nicm 75:
76: line = "/dev/cua00";
77: speed = 9600;
78:
79: /*
80: * Convert obsolescent -### speed to modern -s### syntax which getopt()
81: * can handle.
82: */
83: for (i = 1; i < argc; i++) {
1.10 dlg 84: if (strcmp("--", argv[i]) == 0)
85: break;
86: if (argv[i][0] != '-' || !isdigit(argv[i][1]))
87: continue;
88:
89: if (asprintf(&argv[i], "-s%s", &argv[i][1]) == -1)
90: errx(1, "speed asprintf");
1.1 nicm 91: }
92:
93: while ((opt = getopt(argc, argv, "l:s:")) != -1) {
94: switch (opt) {
95: case 'l':
96: line = optarg;
97: break;
98: case 's':
99: speed = strtonum(optarg, 0, UINT_MAX, &errstr);
100: if (errstr != NULL)
101: errx(1, "speed is %s: %s", errstr, optarg);
102: break;
103: default:
104: usage();
105: }
106: }
107: argc -= optind;
108: argv += optind;
109: if (argc != 0)
110: usage();
111:
112: if (strchr(line, '/') == NULL) {
113: if (asprintf(&tmp, "%s%s", _PATH_DEV, line) == -1)
114: err(1, "asprintf");
115: line = tmp;
116: }
117:
118: line_fd = open(line, O_RDWR);
119: if (line_fd < 0)
120: err(1, "open(\"%s\")", line);
121: if (ioctl(line_fd, TIOCEXCL) != 0)
122: err(1, "ioctl(TIOCEXCL)");
123:
1.2 nicm 124: if (set_line(speed) != 0)
1.4 nicm 125: err(1, "tcsetattr");
1.1 nicm 126:
127: if (isatty(STDIN_FILENO) && tcgetattr(STDIN_FILENO, &saved_tio) != 0)
128: err(1, "tcgetattr");
129:
130: event_init();
1.3 nicm 131:
1.1 nicm 132: signal_set(&sigterm_ev, SIGTERM, signal_event, NULL);
133: signal_add(&sigterm_ev, NULL);
1.8 nicm 134: signal_set(&sighup_ev, SIGHUP, signal_event, NULL);
135: signal_add(&sighup_ev, NULL);
1.3 nicm 136: if (signal(SIGINT, SIG_IGN) == SIG_ERR)
137: err(1, "signal");
138: if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
139: err(1, "signal");
1.1 nicm 140:
1.4 nicm 141: set_termios(); /* after this use cu_err and friends */
1.1 nicm 142:
143: /* stdin and stdout get separate events */
144: input_ev = bufferevent_new(STDIN_FILENO, stream_read, NULL,
145: stream_error, NULL);
146: bufferevent_enable(input_ev, EV_READ);
147: output_ev = bufferevent_new(STDOUT_FILENO, NULL, NULL, stream_error,
148: NULL);
149: bufferevent_enable(output_ev, EV_WRITE);
150:
151: line_ev = bufferevent_new(line_fd, line_read, NULL, line_error,
152: NULL);
153: bufferevent_enable(line_ev, EV_READ|EV_WRITE);
154:
155: printf("Connected (speed %u)\r\n", speed);
156: event_dispatch();
157:
1.5 nicm 158: restore_termios();
1.1 nicm 159: printf("\r\n[EOT]\n");
160:
161: exit(0);
162: }
163:
164: void
165: signal_event(int fd, short events, void *data)
166: {
1.5 nicm 167: restore_termios();
1.1 nicm 168: printf("\r\n[SIG%s]\n", sys_signame[fd]);
169:
170: exit(0);
171: }
172:
173: void
174: set_termios(void)
175: {
176: struct termios tio;
177:
178: if (!isatty(STDIN_FILENO))
179: return;
180:
181: memcpy(&tio, &saved_tio, sizeof(tio));
182: tio.c_lflag &= ~(ICANON|IEXTEN|ECHO);
183: tio.c_iflag &= ~(INPCK|ICRNL);
184: tio.c_oflag &= ~OPOST;
185: tio.c_cc[VMIN] = 1;
186: tio.c_cc[VTIME] = 0;
187: tio.c_cc[VDISCARD] = _POSIX_VDISABLE;
188: tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
189: tio.c_cc[VINTR] = _POSIX_VDISABLE;
190: tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
191: tio.c_cc[VQUIT] = _POSIX_VDISABLE;
192: tio.c_cc[VSUSP] = _POSIX_VDISABLE;
193: if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
1.4 nicm 194: cu_err(1, "tcsetattr");
1.1 nicm 195: }
196:
197: void
198: restore_termios(void)
199: {
1.4 nicm 200: if (isatty(STDIN_FILENO))
201: tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tio);
1.2 nicm 202: }
203:
204: int
205: set_line(int speed)
206: {
207: struct termios tio;
208:
209: cfmakeraw(&tio);
210: tio.c_iflag = 0;
211: tio.c_oflag = 0;
212: tio.c_lflag = 0;
1.9 nicm 213: tio.c_cflag = CREAD|CS8|CLOCAL;
1.2 nicm 214: tio.c_cc[VMIN] = 1;
215: tio.c_cc[VTIME] = 0;
216: cfsetspeed(&tio, speed);
1.4 nicm 217: if (tcsetattr(line_fd, TCSAFLUSH, &tio) != 0)
1.2 nicm 218: return (-1);
219: return (0);
1.1 nicm 220: }
221:
222: void
223: stream_read(struct bufferevent *bufev, void *data)
224: {
225: char *new_data, *ptr;
226: size_t new_size;
227: int state_change;
228:
229: new_data = EVBUFFER_DATA(input_ev->input);
230: new_size = EVBUFFER_LENGTH(input_ev->input);
231: if (new_size == 0)
232: return;
233:
234: state_change = isatty(STDIN_FILENO);
235: for (ptr = new_data; ptr < new_data + new_size; ptr++) {
236: switch (last_state) {
237: case STATE_NONE:
238: if (state_change && *ptr == '\r')
239: last_state = STATE_NEWLINE;
240: break;
241: case STATE_NEWLINE:
242: if (state_change && *ptr == '~') {
243: last_state = STATE_TILDE;
244: continue;
245: }
246: if (*ptr != '\r')
247: last_state = STATE_NONE;
248: break;
249: case STATE_TILDE:
250: do_command(*ptr);
251: last_state = STATE_NEWLINE;
252: continue;
253: }
254:
255: bufferevent_write(line_ev, ptr, 1);
256: }
257:
258: evbuffer_drain(input_ev->input, new_size);
259: }
260:
261: void
262: stream_error(struct bufferevent *bufev, short what, void *data)
263: {
264: event_loopexit(NULL);
265: }
266:
267: void
268: line_read(struct bufferevent *bufev, void *data)
269: {
270: char *new_data;
271: size_t new_size;
272:
273: new_data = EVBUFFER_DATA(line_ev->input);
274: new_size = EVBUFFER_LENGTH(line_ev->input);
275: if (new_size == 0)
276: return;
277:
1.6 nicm 278: if (record_file != NULL)
279: fwrite(new_data, 1, new_size, record_file);
1.1 nicm 280: bufferevent_write(output_ev, new_data, new_size);
281:
282: evbuffer_drain(line_ev->input, new_size);
283: }
284:
285: void
286: line_error(struct bufferevent *bufev, short what, void *data)
287: {
288: event_loopexit(NULL);
289: }
290:
291: /* Expands tildes in the file name. Based on code from ssh/misc.c. */
292: char *
293: tilde_expand(const char *filename1)
294: {
295: const char *filename, *path;
296: char user[128], ret[MAXPATHLEN], *out;
297: struct passwd *pw;
298: u_int len, slash;
299:
300: if (*filename1 != '~')
301: goto no_change;
302: filename = filename1 + 1;
303:
304: path = strchr(filename, '/');
305: if (path != NULL && path > filename) { /* ~user/path */
306: slash = path - filename;
307: if (slash > sizeof(user) - 1)
308: goto no_change;
309: memcpy(user, filename, slash);
310: user[slash] = '\0';
311: if ((pw = getpwnam(user)) == NULL)
312: goto no_change;
313: } else if ((pw = getpwuid(getuid())) == NULL) /* ~/path */
314: goto no_change;
315:
316: if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
317: goto no_change;
318:
319: /* Make sure directory has a trailing '/' */
320: len = strlen(pw->pw_dir);
321: if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
322: strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
323: goto no_change;
324:
325: /* Skip leading '/' from specified path */
326: if (path != NULL)
327: filename = path + 1;
328: if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
329: goto no_change;
330:
331: out = strdup(ret);
332: if (out == NULL)
1.4 nicm 333: cu_err(1, "strdup");
1.1 nicm 334: return (out);
335:
336: no_change:
337: out = strdup(filename1);
338: if (out == NULL)
1.4 nicm 339: cu_err(1, "strdup");
1.1 nicm 340: return (out);
341: }
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