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1.7 ! nicm 1: /* $OpenBSD: cu.c,v 1.6 2012/07/10 12:47:23 nicm 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:
22: #include <err.h>
23: #include <event.h>
24: #include <fcntl.h>
25: #include <getopt.h>
26: #include <paths.h>
27: #include <pwd.h>
28: #include <signal.h>
29: #include <stdio.h>
30: #include <stdlib.h>
31: #include <string.h>
32: #include <termios.h>
33: #include <unistd.h>
34:
35: #include "cu.h"
36:
37: extern char *__progname;
38:
1.6 nicm 39: FILE *record_file;
1.1 nicm 40: struct termios saved_tio;
41: struct bufferevent *input_ev;
42: struct bufferevent *output_ev;
43: int line_fd;
44: struct bufferevent *line_ev;
45: struct event sigterm_ev;
46: enum {
47: STATE_NONE,
48: STATE_NEWLINE,
49: STATE_TILDE
50: } last_state = STATE_NEWLINE;
51:
52: __dead void usage(void);
53: void signal_event(int, short, void *);
54: void stream_read(struct bufferevent *, void *);
55: void stream_error(struct bufferevent *, short, void *);
56: void line_read(struct bufferevent *, void *);
57: void line_error(struct bufferevent *, short, void *);
58:
59: __dead void
60: usage(void)
61: {
1.7 ! nicm 62: fprintf(stderr, "usage: %s [-l line] [-s speed | -speed]\n",
! 63: __progname);
1.1 nicm 64: exit(1);
65: }
66:
67: int
68: main(int argc, char **argv)
69: {
70: const char *line, *errstr;
71: char *tmp;
72: int opt, speed, i, ch;
73: static char sbuf[12];
74:
75: line = "/dev/cua00";
76: speed = 9600;
77:
78: /*
79: * Convert obsolescent -### speed to modern -s### syntax which getopt()
80: * can handle.
81: */
82: for (i = 1; i < argc; i++) {
83: if (argv[i][0] == '-') {
84: switch (argv[i][1]) {
85: case '0': case '1': case '2': case '3': case '4':
86: case '5': case '6': case '7': case '8': case '9':
87: ch = snprintf(sbuf, sizeof(sbuf), "-s%s",
88: &argv[i][1]);
89: if (ch <= 0 || ch >= (int)sizeof(sbuf)) {
90: errx(1, "invalid speed: %s",
91: &argv[i][1]);
92: }
93: argv[i] = sbuf;
94: break;
95: case '-':
96: /* if we get "--" stop processing args */
97: if (argv[i][2] == '\0')
98: goto getopt;
99: break;
100: }
101: }
102: }
103:
104: getopt:
105: while ((opt = getopt(argc, argv, "l:s:")) != -1) {
106: switch (opt) {
107: case 'l':
108: line = optarg;
109: break;
110: case 's':
111: speed = strtonum(optarg, 0, UINT_MAX, &errstr);
112: if (errstr != NULL)
113: errx(1, "speed is %s: %s", errstr, optarg);
114: break;
115: default:
116: usage();
117: }
118: }
119: argc -= optind;
120: argv += optind;
121: if (argc != 0)
122: usage();
123:
124: if (strchr(line, '/') == NULL) {
125: if (asprintf(&tmp, "%s%s", _PATH_DEV, line) == -1)
126: err(1, "asprintf");
127: line = tmp;
128: }
129:
130: line_fd = open(line, O_RDWR);
131: if (line_fd < 0)
132: err(1, "open(\"%s\")", line);
133: if (ioctl(line_fd, TIOCEXCL) != 0)
134: err(1, "ioctl(TIOCEXCL)");
135:
1.2 nicm 136: if (set_line(speed) != 0)
1.4 nicm 137: err(1, "tcsetattr");
1.1 nicm 138:
139: if (isatty(STDIN_FILENO) && tcgetattr(STDIN_FILENO, &saved_tio) != 0)
140: err(1, "tcgetattr");
141:
142: event_init();
1.3 nicm 143:
1.1 nicm 144: signal_set(&sigterm_ev, SIGTERM, signal_event, NULL);
145: signal_add(&sigterm_ev, NULL);
1.3 nicm 146: if (signal(SIGINT, SIG_IGN) == SIG_ERR)
147: err(1, "signal");
148: if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
149: err(1, "signal");
1.1 nicm 150:
1.4 nicm 151: set_termios(); /* after this use cu_err and friends */
1.1 nicm 152:
153: /* stdin and stdout get separate events */
154: input_ev = bufferevent_new(STDIN_FILENO, stream_read, NULL,
155: stream_error, NULL);
156: bufferevent_enable(input_ev, EV_READ);
157: output_ev = bufferevent_new(STDOUT_FILENO, NULL, NULL, stream_error,
158: NULL);
159: bufferevent_enable(output_ev, EV_WRITE);
160:
161: line_ev = bufferevent_new(line_fd, line_read, NULL, line_error,
162: NULL);
163: bufferevent_enable(line_ev, EV_READ|EV_WRITE);
164:
165: printf("Connected (speed %u)\r\n", speed);
166: event_dispatch();
167:
1.5 nicm 168: restore_termios();
1.1 nicm 169: printf("\r\n[EOT]\n");
170:
171: exit(0);
172: }
173:
174: void
175: signal_event(int fd, short events, void *data)
176: {
1.5 nicm 177: restore_termios();
1.1 nicm 178: printf("\r\n[SIG%s]\n", sys_signame[fd]);
179:
180: exit(0);
181: }
182:
183: void
184: set_termios(void)
185: {
186: struct termios tio;
187:
188: if (!isatty(STDIN_FILENO))
189: return;
190:
191: memcpy(&tio, &saved_tio, sizeof(tio));
192: tio.c_lflag &= ~(ICANON|IEXTEN|ECHO);
193: tio.c_iflag &= ~(INPCK|ICRNL);
194: tio.c_oflag &= ~OPOST;
195: tio.c_cc[VMIN] = 1;
196: tio.c_cc[VTIME] = 0;
197: tio.c_cc[VDISCARD] = _POSIX_VDISABLE;
198: tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
199: tio.c_cc[VINTR] = _POSIX_VDISABLE;
200: tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
201: tio.c_cc[VQUIT] = _POSIX_VDISABLE;
202: tio.c_cc[VSUSP] = _POSIX_VDISABLE;
203: if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
1.4 nicm 204: cu_err(1, "tcsetattr");
1.1 nicm 205: }
206:
207: void
208: restore_termios(void)
209: {
1.4 nicm 210: if (isatty(STDIN_FILENO))
211: tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tio);
1.2 nicm 212: }
213:
214: int
215: set_line(int speed)
216: {
217: struct termios tio;
218:
219: cfmakeraw(&tio);
220: tio.c_iflag = 0;
221: tio.c_oflag = 0;
222: tio.c_lflag = 0;
223: tio.c_cflag = CREAD|CS8;
224: tio.c_cc[VMIN] = 1;
225: tio.c_cc[VTIME] = 0;
226: cfsetspeed(&tio, speed);
1.4 nicm 227: if (tcsetattr(line_fd, TCSAFLUSH, &tio) != 0)
1.2 nicm 228: return (-1);
229: return (0);
1.1 nicm 230: }
231:
232: void
233: stream_read(struct bufferevent *bufev, void *data)
234: {
235: char *new_data, *ptr;
236: size_t new_size;
237: int state_change;
238:
239: new_data = EVBUFFER_DATA(input_ev->input);
240: new_size = EVBUFFER_LENGTH(input_ev->input);
241: if (new_size == 0)
242: return;
243:
244: state_change = isatty(STDIN_FILENO);
245: for (ptr = new_data; ptr < new_data + new_size; ptr++) {
246: switch (last_state) {
247: case STATE_NONE:
248: if (state_change && *ptr == '\r')
249: last_state = STATE_NEWLINE;
250: break;
251: case STATE_NEWLINE:
252: if (state_change && *ptr == '~') {
253: last_state = STATE_TILDE;
254: continue;
255: }
256: if (*ptr != '\r')
257: last_state = STATE_NONE;
258: break;
259: case STATE_TILDE:
260: do_command(*ptr);
261: last_state = STATE_NEWLINE;
262: continue;
263: }
264:
265: bufferevent_write(line_ev, ptr, 1);
266: }
267:
268: evbuffer_drain(input_ev->input, new_size);
269: }
270:
271: void
272: stream_error(struct bufferevent *bufev, short what, void *data)
273: {
274: event_loopexit(NULL);
275: }
276:
277: void
278: line_read(struct bufferevent *bufev, void *data)
279: {
280: char *new_data;
281: size_t new_size;
282:
283: new_data = EVBUFFER_DATA(line_ev->input);
284: new_size = EVBUFFER_LENGTH(line_ev->input);
285: if (new_size == 0)
286: return;
287:
1.6 nicm 288: if (record_file != NULL)
289: fwrite(new_data, 1, new_size, record_file);
1.1 nicm 290: bufferevent_write(output_ev, new_data, new_size);
291:
292: evbuffer_drain(line_ev->input, new_size);
293: }
294:
295: void
296: line_error(struct bufferevent *bufev, short what, void *data)
297: {
298: event_loopexit(NULL);
299: }
300:
301: /* Expands tildes in the file name. Based on code from ssh/misc.c. */
302: char *
303: tilde_expand(const char *filename1)
304: {
305: const char *filename, *path;
306: char user[128], ret[MAXPATHLEN], *out;
307: struct passwd *pw;
308: u_int len, slash;
309:
310: if (*filename1 != '~')
311: goto no_change;
312: filename = filename1 + 1;
313:
314: path = strchr(filename, '/');
315: if (path != NULL && path > filename) { /* ~user/path */
316: slash = path - filename;
317: if (slash > sizeof(user) - 1)
318: goto no_change;
319: memcpy(user, filename, slash);
320: user[slash] = '\0';
321: if ((pw = getpwnam(user)) == NULL)
322: goto no_change;
323: } else if ((pw = getpwuid(getuid())) == NULL) /* ~/path */
324: goto no_change;
325:
326: if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
327: goto no_change;
328:
329: /* Make sure directory has a trailing '/' */
330: len = strlen(pw->pw_dir);
331: if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
332: strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
333: goto no_change;
334:
335: /* Skip leading '/' from specified path */
336: if (path != NULL)
337: filename = path + 1;
338: if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
339: goto no_change;
340:
341: out = strdup(ret);
342: if (out == NULL)
1.4 nicm 343: cu_err(1, "strdup");
1.1 nicm 344: return (out);
345:
346: no_change:
347: out = strdup(filename1);
348: if (out == NULL)
1.4 nicm 349: cu_err(1, "strdup");
1.1 nicm 350: return (out);
351: }