Annotation of src/usr.bin/cu/cu.c, Revision 1.16
1.16 ! nicm 1: /* $OpenBSD: cu.c,v 1.15 2013/11/20 20:55:09 deraadt 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;
1.16 ! nicm 44: const char *line_path = NULL;
! 45: int line_speed = -1;
1.1 nicm 46: int line_fd;
1.12 nicm 47: struct termios line_tio;
1.1 nicm 48: struct bufferevent *line_ev;
49: struct event sigterm_ev;
1.8 nicm 50: struct event sighup_ev;
1.1 nicm 51: enum {
52: STATE_NONE,
53: STATE_NEWLINE,
54: STATE_TILDE
55: } last_state = STATE_NEWLINE;
56:
57: __dead void usage(void);
58: void signal_event(int, short, void *);
59: void stream_read(struct bufferevent *, void *);
60: void stream_error(struct bufferevent *, short, void *);
61: void line_read(struct bufferevent *, void *);
62: void line_error(struct bufferevent *, short, void *);
1.16 ! nicm 63: void try_remote(const char *, const char *);
1.1 nicm 64:
65: __dead void
66: usage(void)
67: {
1.16 ! nicm 68: fprintf(stderr, "usage: %s [-l line] [-s speed | -speed] [host]\n",
1.7 nicm 69: __progname);
1.1 nicm 70: exit(1);
71: }
72:
73: int
74: main(int argc, char **argv)
75: {
1.16 ! nicm 76: const char *errstr;
! 77: char *tmp, *s;
! 78: int opt, i;
1.1 nicm 79:
1.16 ! nicm 80: if (isatty(STDIN_FILENO) && tcgetattr(STDIN_FILENO, &saved_tio) != 0)
! 81: err(1, "tcgetattr");
1.1 nicm 82:
83: /*
84: * Convert obsolescent -### speed to modern -s### syntax which getopt()
85: * can handle.
86: */
87: for (i = 1; i < argc; i++) {
1.10 dlg 88: if (strcmp("--", argv[i]) == 0)
89: break;
1.15 deraadt 90: if (argv[i][0] != '-' || !isdigit((unsigned char)argv[i][1]))
1.10 dlg 91: continue;
92:
93: if (asprintf(&argv[i], "-s%s", &argv[i][1]) == -1)
94: errx(1, "speed asprintf");
1.1 nicm 95: }
96:
97: while ((opt = getopt(argc, argv, "l:s:")) != -1) {
98: switch (opt) {
99: case 'l':
1.16 ! nicm 100: line_path = optarg;
1.1 nicm 101: break;
102: case 's':
1.16 ! nicm 103: line_speed = strtonum(optarg, 0, INT_MAX, &errstr);
1.1 nicm 104: if (errstr != NULL)
105: errx(1, "speed is %s: %s", errstr, optarg);
106: break;
107: default:
108: usage();
109: }
110: }
111: argc -= optind;
112: argv += optind;
1.16 ! nicm 113: if (argc != 0 && argc != 1)
1.1 nicm 114: usage();
115:
1.16 ! nicm 116: s = getenv("REMOTE");
! 117: if (argc == 1) {
! 118: if (s != NULL && *s == '/')
! 119: try_remote(argv[0], s);
! 120: else
! 121: try_remote(argv[0], NULL);
! 122: } else if (s != NULL && *s != '/')
! 123: try_remote(s, NULL);
! 124:
! 125: if (line_path == NULL)
! 126: line_path = "/dev/cua00";
! 127: if (line_speed == -1)
! 128: line_speed = 9600;
! 129:
! 130: if (strchr(line_path, '/') == NULL) {
! 131: if (asprintf(&tmp, "%s%s", _PATH_DEV, line_path) == -1)
1.1 nicm 132: err(1, "asprintf");
1.16 ! nicm 133: line_path = tmp;
1.1 nicm 134: }
135:
1.16 ! nicm 136: line_fd = open(line_path, O_RDWR);
1.1 nicm 137: if (line_fd < 0)
1.16 ! nicm 138: err(1, "open(\"%s\")", line_path);
1.1 nicm 139: if (ioctl(line_fd, TIOCEXCL) != 0)
140: err(1, "ioctl(TIOCEXCL)");
1.12 nicm 141: if (tcgetattr(line_fd, &line_tio) != 0)
142: err(1, "tcgetattr");
1.16 ! nicm 143: if (set_line(line_speed) != 0)
1.4 nicm 144: err(1, "tcsetattr");
1.1 nicm 145:
146: event_init();
1.3 nicm 147:
1.1 nicm 148: signal_set(&sigterm_ev, SIGTERM, signal_event, NULL);
149: signal_add(&sigterm_ev, NULL);
1.8 nicm 150: signal_set(&sighup_ev, SIGHUP, signal_event, NULL);
151: signal_add(&sighup_ev, NULL);
1.3 nicm 152: if (signal(SIGINT, SIG_IGN) == SIG_ERR)
153: err(1, "signal");
154: if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
155: err(1, "signal");
1.1 nicm 156:
1.4 nicm 157: set_termios(); /* after this use cu_err and friends */
1.1 nicm 158:
159: /* stdin and stdout get separate events */
160: input_ev = bufferevent_new(STDIN_FILENO, stream_read, NULL,
161: stream_error, NULL);
162: bufferevent_enable(input_ev, EV_READ);
163: output_ev = bufferevent_new(STDOUT_FILENO, NULL, NULL, stream_error,
164: NULL);
165: bufferevent_enable(output_ev, EV_WRITE);
166:
167: line_ev = bufferevent_new(line_fd, line_read, NULL, line_error,
168: NULL);
169: bufferevent_enable(line_ev, EV_READ|EV_WRITE);
170:
1.16 ! nicm 171: printf("Connected to %s (speed %d)\r\n", line_path, line_speed);
1.1 nicm 172: event_dispatch();
173:
1.5 nicm 174: restore_termios();
1.1 nicm 175: printf("\r\n[EOT]\n");
176:
177: exit(0);
178: }
179:
180: void
181: signal_event(int fd, short events, void *data)
182: {
1.5 nicm 183: restore_termios();
1.1 nicm 184: printf("\r\n[SIG%s]\n", sys_signame[fd]);
185:
186: exit(0);
187: }
188:
189: void
190: set_termios(void)
191: {
192: struct termios tio;
193:
194: if (!isatty(STDIN_FILENO))
195: return;
196:
197: memcpy(&tio, &saved_tio, sizeof(tio));
198: tio.c_lflag &= ~(ICANON|IEXTEN|ECHO);
199: tio.c_iflag &= ~(INPCK|ICRNL);
200: tio.c_oflag &= ~OPOST;
201: tio.c_cc[VMIN] = 1;
202: tio.c_cc[VTIME] = 0;
203: tio.c_cc[VDISCARD] = _POSIX_VDISABLE;
204: tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
205: tio.c_cc[VINTR] = _POSIX_VDISABLE;
206: tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
207: tio.c_cc[VQUIT] = _POSIX_VDISABLE;
208: tio.c_cc[VSUSP] = _POSIX_VDISABLE;
209: if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio) != 0)
1.4 nicm 210: cu_err(1, "tcsetattr");
1.1 nicm 211: }
212:
213: void
214: restore_termios(void)
215: {
1.4 nicm 216: if (isatty(STDIN_FILENO))
217: tcsetattr(STDIN_FILENO, TCSAFLUSH, &saved_tio);
1.2 nicm 218: }
219:
220: int
221: set_line(int speed)
222: {
223: struct termios tio;
224:
1.12 nicm 225: memcpy(&tio, &line_tio, sizeof(tio));
226: tio.c_iflag &= ~(ISTRIP|ICRNL);
227: tio.c_oflag &= ~OPOST;
228: tio.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO);
229: tio.c_cflag &= ~(CSIZE|PARENB);
230: tio.c_cflag |= CREAD|CS8|CLOCAL;
1.2 nicm 231: tio.c_cc[VMIN] = 1;
232: tio.c_cc[VTIME] = 0;
233: cfsetspeed(&tio, speed);
1.4 nicm 234: if (tcsetattr(line_fd, TCSAFLUSH, &tio) != 0)
1.2 nicm 235: return (-1);
236: return (0);
1.1 nicm 237: }
238:
239: void
240: stream_read(struct bufferevent *bufev, void *data)
241: {
242: char *new_data, *ptr;
243: size_t new_size;
244: int state_change;
245:
246: new_data = EVBUFFER_DATA(input_ev->input);
247: new_size = EVBUFFER_LENGTH(input_ev->input);
248: if (new_size == 0)
249: return;
250:
251: state_change = isatty(STDIN_FILENO);
252: for (ptr = new_data; ptr < new_data + new_size; ptr++) {
253: switch (last_state) {
254: case STATE_NONE:
255: if (state_change && *ptr == '\r')
256: last_state = STATE_NEWLINE;
257: break;
258: case STATE_NEWLINE:
259: if (state_change && *ptr == '~') {
260: last_state = STATE_TILDE;
261: continue;
262: }
263: if (*ptr != '\r')
264: last_state = STATE_NONE;
265: break;
266: case STATE_TILDE:
267: do_command(*ptr);
268: last_state = STATE_NEWLINE;
269: continue;
270: }
271:
272: bufferevent_write(line_ev, ptr, 1);
273: }
274:
275: evbuffer_drain(input_ev->input, new_size);
276: }
277:
278: void
279: stream_error(struct bufferevent *bufev, short what, void *data)
280: {
281: event_loopexit(NULL);
282: }
283:
284: void
285: line_read(struct bufferevent *bufev, void *data)
286: {
287: char *new_data;
288: size_t new_size;
289:
290: new_data = EVBUFFER_DATA(line_ev->input);
291: new_size = EVBUFFER_LENGTH(line_ev->input);
292: if (new_size == 0)
293: return;
294:
1.6 nicm 295: if (record_file != NULL)
296: fwrite(new_data, 1, new_size, record_file);
1.1 nicm 297: bufferevent_write(output_ev, new_data, new_size);
298:
299: evbuffer_drain(line_ev->input, new_size);
300: }
301:
302: void
303: line_error(struct bufferevent *bufev, short what, void *data)
304: {
305: event_loopexit(NULL);
1.16 ! nicm 306: }
! 307:
! 308: void
! 309: try_remote(const char *host, const char *path)
! 310: {
! 311: const char *paths[] = { "/etc/remote", NULL, NULL };
! 312: char *cp, *s;
! 313: long l;
! 314: int error;
! 315:
! 316: if (path != NULL) {
! 317: paths[0] = path;
! 318: paths[1] = "/etc/remote";
! 319: }
! 320:
! 321: error = cgetent(&cp, (char**)paths, (char*)host);
! 322: if (error < 0) {
! 323: switch (error) {
! 324: case -1:
! 325: cu_errx(1, "unknown host %s", host);
! 326: case -2:
! 327: cu_errx(1, "can't open remote file");
! 328: case -3:
! 329: cu_errx(1, "loop in remote file");
! 330: default:
! 331: cu_errx(1, "unknown error in remote file");
! 332: }
! 333: }
! 334:
! 335: if (line_path == NULL && cgetstr(cp, "dv", &s) >= 0)
! 336: line_path = s;
! 337:
! 338: if (line_speed == -1 && cgetnum(cp, "br", &l) >= 0) {
! 339: if (l < 0 || l > INT_MAX)
! 340: cu_errx(1, "speed out of range");
! 341: line_speed = l;
! 342: }
1.1 nicm 343: }
344:
345: /* Expands tildes in the file name. Based on code from ssh/misc.c. */
346: char *
347: tilde_expand(const char *filename1)
348: {
1.14 tedu 349: const char *filename, *path, *sep;
350: char user[128], *out;
1.1 nicm 351: struct passwd *pw;
352: u_int len, slash;
1.14 tedu 353: int rv;
1.1 nicm 354:
355: if (*filename1 != '~')
356: goto no_change;
357: filename = filename1 + 1;
358:
359: path = strchr(filename, '/');
360: if (path != NULL && path > filename) { /* ~user/path */
361: slash = path - filename;
362: if (slash > sizeof(user) - 1)
363: goto no_change;
364: memcpy(user, filename, slash);
365: user[slash] = '\0';
366: if ((pw = getpwnam(user)) == NULL)
367: goto no_change;
368: } else if ((pw = getpwuid(getuid())) == NULL) /* ~/path */
369: goto no_change;
370:
371: /* Make sure directory has a trailing '/' */
372: len = strlen(pw->pw_dir);
1.14 tedu 373: if (len == 0 || pw->pw_dir[len - 1] != '/')
374: sep = "/";
375: else
376: sep = "";
1.1 nicm 377:
378: /* Skip leading '/' from specified path */
379: if (path != NULL)
380: filename = path + 1;
1.14 tedu 381:
382: if ((rv = asprintf(&out, "%s%s%s", pw->pw_dir, sep, filename)) == -1)
383: cu_err(1, "asprintf");
384: if (rv >= MAXPATHLEN) {
385: free(out);
1.1 nicm 386: goto no_change;
1.14 tedu 387: }
1.1 nicm 388:
389: return (out);
390:
391: no_change:
392: out = strdup(filename1);
393: if (out == NULL)
1.4 nicm 394: cu_err(1, "strdup");
1.1 nicm 395: return (out);
396: }
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