Date:2011-11-21 21:00:32 (8 years 23 days ago)
Author:Werner Almesberger
Commit:7d0683b33599f467fa5f48f4c02d494c95ce2006
Message:neocon: moved over from svn.openmoko.org/developers/werner/neocon/
Files: neocon/Makefile (1 diff)
neocon/README (1 diff)
neocon/neocon.c (1 diff)

Change Details

neocon/Makefile
1PREFIX=/usr/local
2
3CFLAGS=-Wall -g
4
5.PHONY: all clean install uninstall
6
7all: neocon
8
9clean:
10        rm -f neocon
11
12install: neocon
13        install -m 555 neocon $(PREFIX)/bin
14
15uninstall:
16        rm -f $(PREFIX)/bin/neocon
neocon/README
1"neocon" is a simple serial console utility that tries to open a
2ttys that may exist on a system until one such open succeeds. It
3then passes terminal input and output, until there is a read or
4write failure on the tty, in which case it disconnects, and the
5process restarts.
6
7This is mainly intended for serial over USB interfaces that
8disappear when the Neo or debug board is restarted. E.g.,
9neocon /dev/ttyUSB0 /dev/ttyUSB1
10
11The option -t delay_ms throttles keyboard input to a rate of
12one character every "delay_ms" milliseconds. This can be used to
13prevent buffer overruns on the remote end.
14
15"neocon" can log to a file with the option "-l logfile". Non-ASCII
16and non-printable characters are converted to hash signs (#). To
17append to an existing logfile, add the option "-a". To add a
18timestamp before each line, use the option "-T".
19
20To leave neocon, type "~.". The escape character (~) can be changed
21with the option "-e escape".
22
23To manually switch to the next device, enter "~n".
24
25
26Known issues
27------------
28
29- the escape character is sent to the target
neocon/neocon.c
1/*
2 * neocon.c - An interface for changing tty devices
3 *
4 * Copyright (C) 2007, 2008 by OpenMoko, Inc.
5 * Written by Werner Almesberger <werner@openmoko.org>
6 * All Rights Reserved
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23
24#include <stdlib.h>
25#include <stdio.h>
26#include <stdio.h>
27#include <unistd.h>
28#include <string.h>
29#include <termios.h>
30#include <fcntl.h>
31#include <assert.h>
32#include <sys/time.h>
33#include <sys/select.h>
34
35
36#define MAX_BUF 2048
37
38static char *const *ttys;
39static int num_ttys;
40static int curr_tty = -1; /* start with first tty */
41static speed_t speed = B115200;
42static struct termios console, tty;
43static FILE *log = NULL;
44static int timestamp = 0;
45static char escape = '~';
46
47
48static struct bps {
49    speed_t speed;
50    int bps;
51} bps_tab[] = {
52    { B300, 300 },
53    { B1200, 1200 },
54    { B2400, 2400 },
55    { B9600, 9600 },
56    { B19200, 19200 },
57    { B38400, 38400 },
58    { B115200, 115200 },
59    { 0, 0 }
60};
61
62
63static speed_t bps_to_speed(int bps)
64{
65    const struct bps *p;
66
67    for (p = bps_tab; p->bps; p++)
68    if (p->bps == bps)
69        return p->speed;
70    fprintf(stderr, "no such speed: %d bps\n", bps);
71    exit(1);
72}
73
74
75static void make_raw(int fd, struct termios *old)
76{
77    struct termios t;
78    long flags;
79
80    if (tcgetattr(fd, &t) < 0) {
81    perror("tcgetattr");
82    exit(1);
83    }
84    if (old)
85    *old = t;
86    cfmakeraw(&t);
87    if (fd) {
88    t.c_iflag &= ~(IXON | IXOFF);
89    t.c_cflag |= CLOCAL;
90    t.c_cflag &= ~CRTSCTS;
91    if (cfsetispeed(&t, speed) < 0) {
92        perror("cfsetispeed");
93        exit(1);
94    }
95    if (cfsetospeed(&t, speed) < 0) {
96        perror("cfsetospeed");
97        exit(1);
98    }
99    }
100    if (tcsetattr(fd, TCSANOW, &t) < 0) {
101    perror("tcsetattr");
102    exit(1);
103    }
104    flags = fcntl(fd,F_GETFL);
105    if (flags < 0) {
106    perror("fcntl F_GETFL");
107    exit(1);
108    }
109    if (fcntl(fd,F_SETFL,flags & ~O_NONBLOCK) < 0) {
110    perror("fcntl F_GETFL");
111    exit(1);
112    }
113}
114
115
116static int open_next_tty(void)
117{
118    int i, fd = -1;
119
120    for (i = 0; i != num_ttys; i++) {
121    curr_tty = (curr_tty+1) % num_ttys;
122    fd = open(ttys[curr_tty], O_RDWR | O_NDELAY);
123    if (fd >= 0)
124        break;
125    }
126    if (fd >= 0)
127    make_raw(fd, &tty);
128    return fd;
129}
130
131
132/*
133 * Return 1 if the user manually forces a device change.
134 */
135
136
137static int scan(const char *s, size_t len)
138{
139    static int state = 0;
140    const char *p;
141    int res = 0;
142
143    for (p = s; p != s+len; p++)
144    switch (state) {
145        case 0:
146        if (*p == escape)
147            state++;
148        else
149            state = 0;
150        break;
151        case 1:
152        if (*p == '.')
153            exit(0);
154        if (*p == 'n')
155            res = 1;
156        state = 0;
157        break;
158    }
159    return res;
160}
161
162
163static int write_log(const char *buf, ssize_t len)
164{
165    size_t wrote;
166
167    wrote = fwrite(buf, 1, len, log);
168    if (wrote == len)
169    return 1;
170    fprintf(stderr, "write failed. closing log file.\n");
171    fclose(log);
172    log = NULL;
173    return 0;
174}
175
176
177static int add_timestamp(void)
178{
179    struct timeval tv;
180    char buf[40]; /* be generous */
181    int len;
182
183    if (gettimeofday(&tv, NULL) < 0) {
184    perror("gettimeofday");
185    exit(1);
186    }
187    len = sprintf(buf, "%lu.%06lu ",
188      (unsigned long) tv.tv_sec, (unsigned long) tv.tv_usec);
189    return write_log(buf, len);
190}
191
192
193static void do_log(const char *buf, ssize_t len)
194{
195    static int nl = 1; /* we're at the beginning of a new line */
196    char tmp[MAX_BUF];
197    const char *from;
198    char *to;
199
200    assert(len <= MAX_BUF);
201    from = buf;
202    to = tmp;
203    while (from != buf+len) {
204    if (*from == '\r') {
205        from++;
206        continue;
207    }
208    if (nl && timestamp)
209        if (!add_timestamp())
210        return;
211    nl = 0;
212    if (*from == '\n') {
213        *to++ = *from++;
214        if (!write_log(tmp, to-tmp))
215        return;
216        to = tmp;
217        nl = 1;
218        continue;
219    }
220    *to++ = *from < ' ' || *from > '~' ? '#' : *from;
221    from++;
222    }
223    write_log(tmp, to-tmp);
224}
225
226
227static int copy(int in, int out, int from_user, int single)
228{
229    char buffer[MAX_BUF];
230    ssize_t got, wrote, pos;
231
232    got = read(in, buffer, single ? 1 : sizeof(buffer));
233    if (got <= 0)
234    return 0;
235    if (from_user) {
236    if (scan(buffer, got))
237        return 0;
238    }
239    else {
240    if (log)
241        do_log(buffer, got);
242    }
243    for (pos = 0; pos != got; pos += wrote) {
244    wrote = write(out, buffer+pos, got-pos);
245    if (wrote < 0)
246        return 0;
247    }
248    return 1;
249}
250
251
252static void write_string(const char *s)
253{
254    int len = strlen(s);
255
256    while (len) {
257    ssize_t wrote;
258
259    wrote = write(1, s, len);
260    if (wrote < 0) {
261        perror("write");
262        exit(1);
263    }
264    s += wrote;
265    len -= wrote;
266    }
267}
268
269
270static void cleanup(void)
271{
272    if (tcsetattr(0, TCSANOW, &console) < 0)
273    perror("tcsetattr");
274    write(1, "\n", 1);
275}
276
277
278static void usage(const char *name)
279{
280    fprintf(stderr,
281"usage: %s [-b bps] [-e escape] [-l logfile [-a] [-T]] [-t delay_ms] tty ...\n\n"
282" -a append to the log file if it already exists\n"
283" -b bps set the TTY to the specified bit rate\n"
284" -e escape set the escape character (default: ~)\n"
285" -l logfile log all output to the specified file\n"
286" -t delay_ms wait the specified amount of time between input characters\n"
287" -T add timestamps to the log file\n"
288      , name);
289    exit(1);
290}
291
292
293int main(int argc, char *const *argv)
294{
295    char *end;
296    int c, bps;
297    int fd = -1;
298    int append = 0;
299    const char *logfile = NULL;
300    int throttle_us = 0;
301    int throttle = 0;
302
303    while ((c = getopt(argc, argv, "ab:e:l:t:T")) != EOF)
304    switch (c) {
305        case 'a':
306        append = 1;
307        break;
308        case 'b':
309        bps = strtoul(optarg, &end, 0);
310        if (*end)
311            usage(*argv);
312        speed = bps_to_speed(bps);
313        break;
314        case 'e':
315        if (strlen(optarg) != 1)
316            usage(*argv);
317        escape = *optarg;
318        break;
319        case 'l':
320        logfile = optarg;
321        break;
322        case 't':
323        throttle_us = strtoul(optarg, &end, 0)*1000;
324        if (*end)
325            usage(*argv);
326        break;
327        case 'T':
328        timestamp = 1;
329        break;
330        default:
331        usage(*argv);
332    }
333    num_ttys = argc-optind;
334    ttys = argv+optind;
335
336    if (logfile) {
337    log = fopen(logfile, append ? "a" : "w");
338    if (!log) {
339        perror(logfile);
340        exit(1);
341    }
342    setlinebuf(log);
343    }
344
345    make_raw(0, &console);
346    atexit(cleanup);
347    while (1) {
348    struct timeval tv;
349    fd_set set;
350    int res;
351
352    if (fd < 0) {
353        fd = open_next_tty();
354        if (fd > 0) {
355        char buf[1024]; /* enough :-) */
356
357        sprintf(buf, "\r\r[Open %s]\r\n", ttys[curr_tty]);
358        write_string(buf);
359        }
360    }
361    FD_ZERO(&set);
362    if (!throttle)
363        FD_SET(0, &set);
364    if (fd >= 0)
365        FD_SET(fd, &set);
366    tv.tv_sec = 0;
367    tv.tv_usec = throttle ? throttle_us : 100000;
368    res = select(fd < 0 ? 1 : fd+1, &set, NULL, NULL, &tv);
369    if (res < 0) {
370        perror("select");
371        return 1;
372    }
373    if (!res)
374        throttle = 0;
375    if (FD_ISSET(0, &set)) {
376        if (throttle_us)
377        throttle = 1;
378        if (!copy(0, fd, 1, throttle_us != 0))
379        goto failed;
380    }
381    if (fd >= 0 && FD_ISSET(fd, &set))
382        if (!copy(fd, 1, 0, 0))
383        goto failed;
384    continue;
385
386failed:
387    write_string("\r\n[Closed]\r\n");
388    (void) close(fd);
389    fd = -1;
390    }
391    return 0;
392}

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