Annotation of src/usr.bin/cu/cu.c, Revision 1.2
1.2 ! nicm 1: /* $OpenBSD: cu.c,v 1.1 2012/07/10 08:02:27 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:
39: struct termios saved_tio;
40: struct bufferevent *input_ev;
41: struct bufferevent *output_ev;
42: int line_fd;
43: struct bufferevent *line_ev;
44: struct event sigterm_ev;
45: enum {
46: STATE_NONE,
47: STATE_NEWLINE,
48: STATE_TILDE
49: } last_state = STATE_NEWLINE;
50:
51: __dead void usage(void);
52: void signal_event(int, short, void *);
53: void stream_read(struct bufferevent *, void *);
54: void stream_error(struct bufferevent *, short, void *);
55: void line_read(struct bufferevent *, void *);
56: void line_error(struct bufferevent *, short, void *);
57:
58: __dead void
59: usage(void)
60: {
61: fprintf(stderr, "usage: %s [-l line] [-s speed]\n", __progname);
62: exit(1);
63: }
64:
65: int
66: main(int argc, char **argv)
67: {
68: const char *line, *errstr;
69: char *tmp;
70: int opt, speed, i, ch;
71: static char sbuf[12];
72:
73: line = "/dev/cua00";
74: speed = 9600;
75:
76: /*
77: * Convert obsolescent -### speed to modern -s### syntax which getopt()
78: * can handle.
79: */
80: for (i = 1; i < argc; i++) {
81: if (argv[i][0] == '-') {
82: switch (argv[i][1]) {
83: case '0': case '1': case '2': case '3': case '4':
84: case '5': case '6': case '7': case '8': case '9':
85: ch = snprintf(sbuf, sizeof(sbuf), "-s%s",
86: &argv[i][1]);
87: if (ch <= 0 || ch >= (int)sizeof(sbuf)) {
88: errx(1, "invalid speed: %s",
89: &argv[i][1]);
90: }
91: argv[i] = sbuf;
92: break;
93: case '-':
94: /* if we get "--" stop processing args */
95: if (argv[i][2] == '\0')
96: goto getopt;
97: break;
98: }
99: }
100: }
101:
102: getopt:
103: while ((opt = getopt(argc, argv, "l:s:")) != -1) {
104: switch (opt) {
105: case 'l':
106: line = optarg;
107: break;
108: case 's':
109: speed = strtonum(optarg, 0, UINT_MAX, &errstr);
110: if (errstr != NULL)
111: errx(1, "speed is %s: %s", errstr, optarg);
112: break;
113: default:
114: usage();
115: }
116: }
117: argc -= optind;
118: argv += optind;
119: if (argc != 0)
120: usage();
121:
122: if (strchr(line, '/') == NULL) {
123: if (asprintf(&tmp, "%s%s", _PATH_DEV, line) == -1)
124: err(1, "asprintf");
125: line = tmp;
126: }
127:
128: line_fd = open(line, O_RDWR);
129: if (line_fd < 0)
130: err(1, "open(\"%s\")", line);
131: if (ioctl(line_fd, TIOCEXCL) != 0)
132: err(1, "ioctl(TIOCEXCL)");
133:
1.2 ! nicm 134: if (set_line(speed) != 0)
! 135: exit(1);
1.1 nicm 136:
137: if (isatty(STDIN_FILENO) && tcgetattr(STDIN_FILENO, &saved_tio) != 0)
138: err(1, "tcgetattr");
139:
140: event_init();
141: signal_set(&sigterm_ev, SIGTERM, signal_event, NULL);
142: signal_add(&sigterm_ev, NULL);
143:
144: set_termios();
145:
146: /* stdin and stdout get separate events */
147: input_ev = bufferevent_new(STDIN_FILENO, stream_read, NULL,
148: stream_error, NULL);
149: bufferevent_enable(input_ev, EV_READ);
150: output_ev = bufferevent_new(STDOUT_FILENO, NULL, NULL, stream_error,
151: NULL);
152: bufferevent_enable(output_ev, EV_WRITE);
153:
154: line_ev = bufferevent_new(line_fd, line_read, NULL, line_error,
155: NULL);
156: bufferevent_enable(line_ev, EV_READ|EV_WRITE);
157:
158: printf("Connected (speed %u)\r\n", speed);
159: event_dispatch();
160:
161: if (isatty(STDIN_FILENO))
162: tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tio);
163: printf("\r\n[EOT]\n");
164:
165: exit(0);
166: }
167:
168: void
169: signal_event(int fd, short events, void *data)
170: {
171: if (isatty(STDIN_FILENO))
172: tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tio);
173: printf("\r\n[SIG%s]\n", sys_signame[fd]);
174:
175: exit(0);
176: }
177:
178: void
179: set_termios(void)
180: {
181: struct termios tio;
182:
183: if (!isatty(STDIN_FILENO))
184: return;
185:
186: memcpy(&tio, &saved_tio, sizeof(tio));
187: tio.c_lflag &= ~(ICANON|IEXTEN|ECHO);
188: tio.c_iflag &= ~(INPCK|ICRNL);
189: tio.c_oflag &= ~OPOST;
190: tio.c_cc[VMIN] = 1;
191: tio.c_cc[VTIME] = 0;
192: tio.c_cc[VDISCARD] = _POSIX_VDISABLE;
193: tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
194: tio.c_cc[VINTR] = _POSIX_VDISABLE;
195: tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
196: tio.c_cc[VQUIT] = _POSIX_VDISABLE;
197: tio.c_cc[VSUSP] = _POSIX_VDISABLE;
198: if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
199: err(1, "tcsetattr");
200: }
201:
202: void
203: restore_termios(void)
204: {
205: if (!isatty(STDIN_FILENO))
206: return;
207:
208: if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tio) != 0)
209: err(1, "tcsetattr");
1.2 ! nicm 210: }
! 211:
! 212: int
! 213: set_line(int speed)
! 214: {
! 215: struct termios tio;
! 216:
! 217: cfmakeraw(&tio);
! 218: tio.c_iflag = 0;
! 219: tio.c_oflag = 0;
! 220: tio.c_lflag = 0;
! 221: tio.c_cflag = CREAD|CS8;
! 222: tio.c_cc[VMIN] = 1;
! 223: tio.c_cc[VTIME] = 0;
! 224: cfsetspeed(&tio, speed);
! 225: if (tcsetattr(line_fd, TCSAFLUSH, &tio) != 0) {
! 226: warn("tcsetattr");
! 227: return (-1);
! 228: }
! 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:
288: bufferevent_write(output_ev, new_data, new_size);
289:
290: evbuffer_drain(line_ev->input, new_size);
291: }
292:
293: void
294: line_error(struct bufferevent *bufev, short what, void *data)
295: {
296: event_loopexit(NULL);
297: }
298:
299: /* Expands tildes in the file name. Based on code from ssh/misc.c. */
300: char *
301: tilde_expand(const char *filename1)
302: {
303: const char *filename, *path;
304: char user[128], ret[MAXPATHLEN], *out;
305: struct passwd *pw;
306: u_int len, slash;
307:
308: if (*filename1 != '~')
309: goto no_change;
310: filename = filename1 + 1;
311:
312: path = strchr(filename, '/');
313: if (path != NULL && path > filename) { /* ~user/path */
314: slash = path - filename;
315: if (slash > sizeof(user) - 1)
316: goto no_change;
317: memcpy(user, filename, slash);
318: user[slash] = '\0';
319: if ((pw = getpwnam(user)) == NULL)
320: goto no_change;
321: } else if ((pw = getpwuid(getuid())) == NULL) /* ~/path */
322: goto no_change;
323:
324: if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
325: goto no_change;
326:
327: /* Make sure directory has a trailing '/' */
328: len = strlen(pw->pw_dir);
329: if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
330: strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
331: goto no_change;
332:
333: /* Skip leading '/' from specified path */
334: if (path != NULL)
335: filename = path + 1;
336: if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
337: goto no_change;
338:
339: out = strdup(ret);
340: if (out == NULL)
341: err(1, "strdup");
342: return (out);
343:
344: no_change:
345: out = strdup(filename1);
346: if (out == NULL)
347: err(1, "strdup");
348: return (out);
349: }