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1.18 ratchov 1: /* $OpenBSD$ */
1.1 ratchov 2: /*
3: * Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17: #include <sys/stat.h>
18: #include <sys/types.h>
19: #include <sys/resource.h>
1.18 ratchov 20: #include <sys/socket.h>
1.1 ratchov 21:
22: #include <err.h>
23: #include <errno.h>
24: #include <fcntl.h>
25: #include <grp.h>
26: #include <limits.h>
27: #include <pwd.h>
28: #include <signal.h>
29: #include <sndio.h>
30: #include <stdio.h>
31: #include <stdlib.h>
32: #include <string.h>
33: #include <unistd.h>
34:
35: #include "amsg.h"
36: #include "defs.h"
37: #include "dev.h"
1.18 ratchov 38: #include "fdpass.h"
1.1 ratchov 39: #include "file.h"
40: #include "listen.h"
41: #include "midi.h"
42: #include "opt.h"
43: #include "sock.h"
44: #include "utils.h"
45:
46: /*
47: * unprivileged user name
48: */
49: #ifndef SNDIO_USER
50: #define SNDIO_USER "_sndio"
51: #endif
52:
53: /*
1.18 ratchov 54: * privileged user name
55: */
56: #ifndef SNDIO_PRIV_USER
57: #define SNDIO_PRIV_USER "_sndiop"
58: #endif
59:
60: /*
1.1 ratchov 61: * priority when run as root
62: */
63: #ifndef SNDIO_PRIO
64: #define SNDIO_PRIO (-20)
65: #endif
66:
67: /*
68: * sample rate if no ``-r'' is used
69: */
70: #ifndef DEFAULT_RATE
71: #define DEFAULT_RATE 48000
72: #endif
73:
74: /*
75: * block size if neither ``-z'' nor ``-b'' is used
76: */
77: #ifndef DEFAULT_ROUND
78: #define DEFAULT_ROUND 960
79: #endif
80:
81: /*
82: * buffer size if neither ``-z'' nor ``-b'' is used
83: */
84: #ifndef DEFAULT_BUFSZ
1.8 dcoppa 85: #define DEFAULT_BUFSZ 7680
1.1 ratchov 86: #endif
87:
88: /*
89: * default device in server mode
90: */
91: #ifndef DEFAULT_DEV
92: #define DEFAULT_DEV "rsnd/0"
93: #endif
1.5 ratchov 94:
95: void sigint(int);
96: void opt_ch(int *, int *);
97: void opt_enc(struct aparams *);
98: int opt_mmc(void);
99: int opt_onoff(void);
100: int getword(char *, char **);
101: unsigned int opt_mode(void);
102: void getbasepath(char *, size_t);
103: void setsig(void);
104: void unsetsig(void);
105: struct dev *mkdev(char *, struct aparams *,
106: int, int, int, int, int, int);
107: struct opt *mkopt(char *, struct dev *,
108: int, int, int, int, int, int, int, int);
1.1 ratchov 109:
110: unsigned int log_level = 0;
111: volatile sig_atomic_t quit_flag = 0;
112:
113: char usagestr[] = "usage: sndiod [-d] [-a flag] [-b nframes] "
114: "[-C min:max] [-c min:max] [-e enc]\n\t"
115: "[-f device] [-j flag] [-L addr] [-m mode] [-q port] [-r rate]\n\t"
116: "[-s name] [-t mode] [-U unit] [-v volume] [-w flag] [-z nframes]\n";
117:
118: /*
119: * SIGINT handler, it raises the quit flag. If the flag is already set,
120: * that means that the last SIGINT was not handled, because the process
121: * is blocked somewhere, so exit.
122: */
123: void
124: sigint(int s)
125: {
126: if (quit_flag)
127: _exit(1);
128: quit_flag = 1;
129: }
130:
131: void
132: opt_ch(int *rcmin, int *rcmax)
133: {
134: char *next, *end;
135: long cmin, cmax;
136:
137: errno = 0;
138: cmin = strtol(optarg, &next, 10);
139: if (next == optarg || *next != ':')
140: goto failed;
141: cmax = strtol(++next, &end, 10);
142: if (end == next || *end != '\0')
143: goto failed;
144: if (cmin < 0 || cmax < cmin || cmax >= NCHAN_MAX)
145: goto failed;
146: *rcmin = cmin;
147: *rcmax = cmax;
148: return;
149: failed:
150: errx(1, "%s: bad channel range", optarg);
151: }
152:
153: void
154: opt_enc(struct aparams *par)
155: {
156: int len;
157:
158: len = aparams_strtoenc(par, optarg);
159: if (len == 0 || optarg[len] != '\0')
160: errx(1, "%s: bad encoding", optarg);
161: }
162:
163: int
164: opt_mmc(void)
165: {
166: if (strcmp("off", optarg) == 0)
167: return 0;
168: if (strcmp("slave", optarg) == 0)
169: return 1;
170: errx(1, "%s: off/slave expected", optarg);
171: }
172:
173: int
174: opt_onoff(void)
175: {
176: if (strcmp("off", optarg) == 0)
177: return 0;
178: if (strcmp("on", optarg) == 0)
179: return 1;
180: errx(1, "%s: on/off expected", optarg);
181: }
182:
1.4 ratchov 183: int
184: getword(char *word, char **str)
185: {
186: char *p = *str;
187:
188: for (;;) {
189: if (*word == '\0')
190: break;
191: if (*word++ != *p++)
192: return 0;
193: }
194: if (*p == ',' || *p == '\0') {
195: *str = p;
196: return 1;
197: }
198: return 0;
199: }
200:
1.1 ratchov 201: unsigned int
202: opt_mode(void)
203: {
204: unsigned int mode = 0;
205: char *p = optarg;
206:
1.4 ratchov 207: for (;;) {
208: if (getword("play", &p)) {
1.1 ratchov 209: mode |= MODE_PLAY;
1.4 ratchov 210: } else if (getword("rec", &p)) {
1.1 ratchov 211: mode |= MODE_REC;
1.4 ratchov 212: } else if (getword("mon", &p)) {
1.1 ratchov 213: mode |= MODE_MON;
1.4 ratchov 214: } else if (getword("midi", &p)) {
1.1 ratchov 215: mode |= MODE_MIDIMASK;
1.4 ratchov 216: } else
1.1 ratchov 217: errx(1, "%s: bad mode", optarg);
218: if (*p == '\0')
219: break;
1.4 ratchov 220: p++;
1.1 ratchov 221: }
222: if (mode == 0)
223: errx(1, "empty mode");
224: return mode;
225: }
226:
227: void
228: setsig(void)
229: {
230: struct sigaction sa;
231:
232: quit_flag = 0;
233: sigfillset(&sa.sa_mask);
234: sa.sa_flags = SA_RESTART;
235: sa.sa_handler = sigint;
236: if (sigaction(SIGINT, &sa, NULL) < 0)
237: err(1, "sigaction(int) failed");
238: if (sigaction(SIGTERM, &sa, NULL) < 0)
239: err(1, "sigaction(term) failed");
240: if (sigaction(SIGHUP, &sa, NULL) < 0)
241: err(1, "sigaction(hup) failed");
242: }
243:
244: void
245: unsetsig(void)
246: {
247: struct sigaction sa;
248:
249: sigfillset(&sa.sa_mask);
250: sa.sa_flags = SA_RESTART;
251: sa.sa_handler = SIG_DFL;
252: if (sigaction(SIGHUP, &sa, NULL) < 0)
253: err(1, "unsetsig(hup): sigaction failed\n");
254: if (sigaction(SIGTERM, &sa, NULL) < 0)
255: err(1, "unsetsig(term): sigaction failed\n");
256: if (sigaction(SIGINT, &sa, NULL) < 0)
257: err(1, "unsetsig(int): sigaction failed\n");
258: }
259:
260: void
261: getbasepath(char *base, size_t size)
262: {
263: uid_t uid;
264: struct stat sb;
1.14 ratchov 265: mode_t mask, omask;
1.1 ratchov 266:
267: uid = geteuid();
268: if (uid == 0) {
269: mask = 022;
1.10 ratchov 270: snprintf(base, SOCKPATH_MAX, SOCKPATH_DIR);
1.1 ratchov 271: } else {
272: mask = 077;
1.10 ratchov 273: snprintf(base, SOCKPATH_MAX, SOCKPATH_DIR "-%u", uid);
1.1 ratchov 274: }
1.14 ratchov 275: omask = umask(mask);
276: if (mkdir(base, 0777) < 0) {
1.1 ratchov 277: if (errno != EEXIST)
278: err(1, "mkdir(\"%s\")", base);
279: }
1.14 ratchov 280: umask(omask);
1.1 ratchov 281: if (stat(base, &sb) < 0)
282: err(1, "stat(\"%s\")", base);
283: if (sb.st_uid != uid || (sb.st_mode & mask) != 0)
284: errx(1, "%s has wrong permissions", base);
285: }
286:
287: struct dev *
288: mkdev(char *path, struct aparams *par,
289: int mode, int bufsz, int round, int rate, int hold, int autovol)
290: {
291: struct dev *d;
292:
293: for (d = dev_list; d != NULL; d = d->next) {
294: if (strcmp(d->path, path) == 0)
295: return d;
296: }
297: if (!bufsz && !round) {
298: round = DEFAULT_ROUND;
299: bufsz = DEFAULT_BUFSZ;
300: } else if (!bufsz) {
301: bufsz = round * 2;
302: } else if (!round)
303: round = bufsz / 2;
304: d = dev_new(path, par, mode, bufsz, round, rate, hold, autovol);
305: if (d == NULL)
306: exit(1);
307: return d;
308: }
309:
310: struct opt *
311: mkopt(char *path, struct dev *d,
312: int pmin, int pmax, int rmin, int rmax,
313: int mode, int vol, int mmc, int dup)
314: {
315: struct opt *o;
316:
317: o = opt_new(path, d, pmin, pmax, rmin, rmax,
318: MIDI_TO_ADATA(vol), mmc, dup, mode);
319: if (o == NULL)
320: errx(1, "%s: couldn't create subdev", path);
321: dev_adjpar(d, o->mode, o->pmin, o->pmax, o->rmin, o->rmax);
322: return o;
323: }
324:
325: int
326: main(int argc, char **argv)
327: {
328: int c, background, unit;
329: int pmin, pmax, rmin, rmax;
1.13 ratchov 330: char base[SOCKPATH_MAX], path[SOCKPATH_MAX], *tcpaddr;
1.1 ratchov 331: unsigned int mode, dup, mmc, vol;
332: unsigned int hold, autovol, bufsz, round, rate;
333: const char *str;
334: struct aparams par;
335: struct dev *d;
336: struct port *p;
337: struct listen *l;
1.17 ratchov 338: struct passwd *pw;
1.18 ratchov 339: int s[2];
340: pid_t pid;
1.20 ratchov 341: uid_t euid, hpw_uid, wpw_uid;
342: gid_t hpw_gid, wpw_gid;
343: char *wpw_dir;
1.1 ratchov 344:
345: atexit(log_flush);
346:
347: /*
348: * global options defaults
349: */
350: vol = 118;
351: dup = 1;
352: mmc = 0;
353: hold = 0;
354: autovol = 1;
355: bufsz = 0;
356: round = 0;
357: rate = DEFAULT_RATE;
358: unit = 0;
359: background = 1;
360: pmin = 0;
361: pmax = 1;
362: rmin = 0;
363: rmax = 1;
364: aparams_init(&par);
365: mode = MODE_PLAY | MODE_REC;
1.13 ratchov 366: tcpaddr = NULL;
1.1 ratchov 367:
1.15 ratchov 368: while ((c = getopt(argc, argv, "a:b:c:C:de:f:j:L:m:q:r:s:t:U:v:w:x:z:")) != -1) {
1.1 ratchov 369: switch (c) {
370: case 'd':
371: log_level++;
372: background = 0;
373: break;
374: case 'U':
375: unit = strtonum(optarg, 0, 15, &str);
376: if (str)
377: errx(1, "%s: unit number is %s", optarg, str);
378: break;
379: case 'L':
1.13 ratchov 380: tcpaddr = optarg;
1.1 ratchov 381: break;
382: case 'm':
383: mode = opt_mode();
384: break;
385: case 'j':
386: dup = opt_onoff();
387: break;
388: case 't':
389: mmc = opt_mmc();
390: break;
391: case 'c':
392: opt_ch(&pmin, &pmax);
393: break;
394: case 'C':
395: opt_ch(&rmin, &rmax);
396: break;
397: case 'e':
398: opt_enc(&par);
399: break;
400: case 'r':
401: rate = strtonum(optarg, RATE_MIN, RATE_MAX, &str);
402: if (str)
403: errx(1, "%s: rate is %s", optarg, str);
404: break;
405: case 'v':
406: vol = strtonum(optarg, 0, MIDI_MAXCTL, &str);
407: if (str)
408: errx(1, "%s: volume is %s", optarg, str);
409: break;
410: case 's':
411: if ((d = dev_list) == NULL) {
412: d = mkdev(DEFAULT_DEV, &par, 0, bufsz, round, rate,
413: hold, autovol);
414: }
415: mkopt(optarg, d, pmin, pmax, rmin, rmax,
416: mode, vol, mmc, dup);
417: break;
418: case 'q':
1.3 ratchov 419: p = port_new(optarg, MODE_MIDIMASK, hold);
1.1 ratchov 420: if (!p)
421: errx(1, "%s: can't open port", optarg);
422: break;
423: case 'a':
424: hold = opt_onoff();
425: break;
426: case 'w':
427: autovol = opt_onoff();
428: break;
429: case 'b':
430: bufsz = strtonum(optarg, 1, RATE_MAX, &str);
431: if (str)
432: errx(1, "%s: buffer size is %s", optarg, str);
433: break;
434: case 'z':
435: round = strtonum(optarg, 1, SHRT_MAX, &str);
436: if (str)
437: errx(1, "%s: block size is %s", optarg, str);
438: break;
439: case 'f':
440: mkdev(optarg, &par, 0, bufsz, round, rate, hold, autovol);
441: break;
442: default:
443: fputs(usagestr, stderr);
444: return 1;
445: }
446: }
447: argc -= optind;
448: argv += optind;
449: if (argc > 0) {
450: fputs(usagestr, stderr);
451: return 1;
452: }
453: if (dev_list == NULL)
454: mkdev(DEFAULT_DEV, &par, 0, bufsz, round, rate, hold, autovol);
455: for (d = dev_list; d != NULL; d = d->next) {
456: if (opt_byname("default", d->num))
457: continue;
458: mkopt("default", d, pmin, pmax, rmin, rmax,
459: mode, vol, mmc, dup);
460: }
1.17 ratchov 461:
462: setsig();
463: filelist_init();
464:
1.20 ratchov 465: euid = geteuid();
466: if (euid == 0) {
467: if ((pw = getpwnam(SNDIO_PRIV_USER)) == NULL)
468: errx(1, "unknown user %s", SNDIO_PRIV_USER);
469: hpw_uid = pw->pw_uid;
470: hpw_gid = pw->pw_gid;
471: if ((pw = getpwnam(SNDIO_USER)) == NULL)
472: errx(1, "unknown user %s", SNDIO_USER);
473: wpw_uid = pw->pw_uid;
474: wpw_gid = pw->pw_gid;
475: wpw_dir = xstrdup(pw->pw_dir);
476: } else {
1.21 ratchov 477: hpw_uid = wpw_uid = hpw_gid = wpw_gid = 0xdeadbeef;
478: wpw_dir = NULL;
1.20 ratchov 479: }
480:
1.18 ratchov 481: /* start subprocesses */
482:
483: if (socketpair(AF_UNIX, SOCK_STREAM, 0, s) < 0) {
484: perror("socketpair");
485: return 1;
1.13 ratchov 486: }
1.18 ratchov 487: pid = fork();
488: if (pid == -1) {
489: log_puts("can't fork\n");
490: return 1;
1.1 ratchov 491: }
1.18 ratchov 492: if (pid == 0) {
493: setproctitle("helper");
494: close(s[0]);
495: if (fdpass_new(s[1], &helper_fileops) == NULL)
1.1 ratchov 496: return 1;
1.18 ratchov 497: if (background) {
498: log_flush();
499: log_level = 0;
500: if (daemon(0, 0) < 0)
501: err(1, "daemon");
502: }
1.20 ratchov 503: if (euid == 0) {
504: if (setgroups(1, &hpw_gid) ||
505: setresgid(hpw_gid, hpw_gid, hpw_gid) ||
506: setresuid(hpw_uid, hpw_uid, hpw_uid))
1.18 ratchov 507: err(1, "cannot drop privileges");
508: }
1.22 ratchov 509: if (pledge("stdio sendfd rpath wpath", NULL) < 0)
510: err(1, "pledge");
1.18 ratchov 511: while (file_poll())
512: ; /* nothing */
513: } else {
514: close(s[1]);
515: if (fdpass_new(s[0], &worker_fileops) == NULL)
1.1 ratchov 516: return 1;
1.18 ratchov 517:
518: getbasepath(base, sizeof(base));
519: snprintf(path,
520: SOCKPATH_MAX, "%s/" SOCKPATH_FILE "%u",
521: base, unit);
1.23 ratchov 522: if (!listen_new_un(path))
523: return 1;
524: if (tcpaddr) {
525: if (!listen_new_tcp(tcpaddr, AUCAT_PORT + unit))
526: return 1;
527: }
1.18 ratchov 528: for (l = listen_list; l != NULL; l = l->next) {
529: if (!listen_init(l))
530: return 1;
531: }
532:
533: midi_init();
534: for (p = port_list; p != NULL; p = p->next) {
535: if (!port_init(p))
536: return 1;
537: }
538: for (d = dev_list; d != NULL; d = d->next) {
539: if (!dev_init(d))
540: return 1;
541: }
542: if (background) {
543: log_flush();
544: log_level = 0;
545: if (daemon(0, 0) < 0)
546: err(1, "daemon");
547: }
1.20 ratchov 548: if (euid == 0) {
1.18 ratchov 549: if (setpriority(PRIO_PROCESS, 0, SNDIO_PRIO) < 0)
550: err(1, "setpriority");
1.20 ratchov 551: if (chroot(wpw_dir) != 0 || chdir("/") != 0)
552: err(1, "cannot chroot to %s", wpw_dir);
553: if (setgroups(1, &wpw_gid) ||
554: setresgid(wpw_gid, wpw_gid, wpw_gid) ||
555: setresuid(wpw_uid, wpw_uid, wpw_uid))
1.18 ratchov 556: err(1, "cannot drop privileges");
1.22 ratchov 557: }
558: if (tcpaddr) {
559: if (pledge("stdio audio recvfd unix inet", NULL) == -1)
560: err(1, "pledge");
561: } else {
562: if (pledge("stdio audio recvfd unix", NULL) == -1)
563: err(1, "pledge");
1.18 ratchov 564: }
565: for (;;) {
566: if (quit_flag)
567: break;
568: if (!fdpass_peer)
569: break;
570: if (!file_poll())
571: break;
572: }
573: if (fdpass_peer)
574: fdpass_close(fdpass_peer);
575: while (listen_list != NULL)
576: listen_close(listen_list);
577: while (sock_list != NULL)
578: sock_close(sock_list);
579: for (d = dev_list; d != NULL; d = d->next)
580: dev_done(d);
581: for (p = port_list; p != NULL; p = p->next)
582: port_done(p);
583: while (file_poll())
584: ; /* nothing */
585: midi_done();
1.1 ratchov 586: }
587: while (opt_list != NULL)
588: opt_del(opt_list);
589: while (dev_list)
590: dev_del(dev_list);
591: while (port_list)
592: port_del(port_list);
593: filelist_done();
594: unsetsig();
595: return 0;
596: }