source: code/icbd.c@ 7882a6f

Last change on this file since 7882a6f was 7882a6f, checked in by Mike Belopuhov <mike@…>, 11 years ago

Get rid of the icbd callbacks interface

I believe the idea was initially to have both icb and irc in one
daemon but that's not going to happen.
  • Property mode set to 100644
File size: 12.9 KB
RevLine 
[cd7b81d]1/*
2 * Copyright (c) 2009 Mike Belopuhov
3 * Copyright (c) 2007 Oleg Safiullin
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
18#include <sys/types.h>
19#include <sys/queue.h>
20#include <sys/socket.h>
21#include <sys/stat.h>
[c8c9ccf]22#include <netinet/in_systm.h>
[cd7b81d]23#include <netinet/in.h>
[c8c9ccf]24#include <netinet/ip.h>
[cd7b81d]25#include <arpa/inet.h>
26#include <fcntl.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <unistd.h>
30#include <string.h>
31#include <sysexits.h>
32#include <syslog.h>
33#include <pwd.h>
34#include <login_cap.h>
35#include <locale.h>
36#include <netdb.h>
37#include <event.h>
38#include <errno.h>
39#include <err.h>
[e87ab6d]40#include <resolv.h>
[cd7b81d]41
42#include "icb.h"
43#include "icbd.h"
44
[82d3c1f]45struct stat modtabst;
[270fd23]46char modtabpath[MAXPATHLEN];
[1d2125a]47char modtab[ICB_MTABLEN][ICB_MAXNICKLEN];
48int modtabcnt;
[a785c27]49char srvname[MAXHOSTNAMELEN];
50int creategroups;
51int foreground;
[3dba97d]52char logprefix[MAXPATHLEN/2];
[460786f]53int dodns = 1;
[3dba97d]54int dologging;
[a785c27]55int verbose;
[cd7b81d]56
57void usage(void);
58void getpeerinfo(struct icb_session *);
59void icbd_accept(int, short, void *);
[6e89d69]60void icbd_paused(int, short, void *);
[cd7b81d]61void icbd_drop(struct icb_session *, char *);
62void icbd_ioerr(struct bufferevent *, short, void *);
63void icbd_dispatch(struct bufferevent *, void *);
64void icbd_log(struct icb_session *, int, const char *, ...);
65void icbd_grplist(char *);
66void icbd_restrict(void);
[7882a6f]67void icbd_send(struct icb_session *, char *, ssize_t);
[cd7b81d]68
[6e89d69]69struct icbd_listener {
70 struct event ev, pause;
71};
72
[cd7b81d]73int
74main(int argc, char *argv[])
75{
76 const char *cause = NULL;
77 int ch, nsocks = 0, save_errno = 0;
78 int inet4 = 0, inet6 = 0;
79
80 /* init group lists before calling icb_addgroup */
[7882a6f]81 icb_init();
[cd7b81d]82
[460786f]83 while ((ch = getopt(argc, argv, "46CdG:M:nL:S:v")) != -1)
[cd7b81d]84 switch (ch) {
85 case '4':
86 inet4++;
87 break;
88 case '6':
89 inet6++;
90 break;
91 case 'C':
92 creategroups++;
93 break;
94 case 'd':
95 foreground++;
96 break;
97 case 'G':
98 icbd_grplist(optarg);
99 break;
[3dba97d]100 case 'L':
101 strlcpy(logprefix, optarg, sizeof logprefix);
102 dologging++;
103 break;
[1d2125a]104 case 'M':
[270fd23]105 strlcpy(modtabpath, optarg, sizeof modtabpath);
[1d2125a]106 break;
[460786f]107 case 'n':
108 dodns = 0;
109 break;
[a785c27]110 case 'S':
111 strlcpy(srvname, optarg, sizeof srvname);
112 break;
[cd7b81d]113 case 'v':
114 verbose++;
115 break;
116 default:
117 usage();
118 /* NOTREACHED */
119 }
120 argc -= optind;
121 argv += optind;
122
123 /* add group "1" as it's a login group for most of the clients */
124 if (icb_addgroup(NULL, "1", NULL) == NULL)
125 err(EX_UNAVAILABLE, NULL);
126
127 if (argc == 0)
128 argc++;
129
130 if (inet4 && inet6)
[2e37e9f]131 errx(EX_USAGE, "Can't specify both -4 and -6");
[cd7b81d]132
133 tzset();
134 (void)setlocale(LC_ALL, "C");
135
136 if (foreground)
137 openlog("icbd", LOG_PID | LOG_PERROR, LOG_DAEMON);
138 else
139 openlog("icbd", LOG_PID | LOG_NDELAY, LOG_DAEMON);
140
141 if (!foreground && daemon(0, 0) < 0)
142 err(EX_OSERR, NULL);
143
144 (void)event_init();
145
146 for (ch = 0; ch < argc; ch++) {
147 struct addrinfo hints, *res, *res0;
[6e89d69]148 struct icbd_listener *l;
[cd7b81d]149 char *addr, *port;
150 int error, s, on = 1;
151
152 addr = port = NULL;
153 if (argv[ch] != NULL) {
154 if (argv[ch][0] != ':')
155 addr = argv[ch];
156 if ((port = strrchr(argv[ch], ':')) != NULL)
157 *port++ = '\0';
158 }
159
160 bzero(&hints, sizeof hints);
161 if (inet4 || inet6)
162 hints.ai_family = inet4 ? PF_INET : PF_INET6;
163 else
164 hints.ai_family = PF_UNSPEC;
165 hints.ai_socktype = SOCK_STREAM;
166 hints.ai_flags = AI_PASSIVE;
167 if ((error = getaddrinfo(addr, port ? port : "icb", &hints,
168 &res0)) != 0) {
169 syslog(LOG_ERR, "%s", gai_strerror(error));
170 return (EX_UNAVAILABLE);
171 }
172
173 for (res = res0; res != NULL; res = res->ai_next) {
174 if ((s = socket(res->ai_family, res->ai_socktype,
175 res->ai_protocol)) < 0) {
176 cause = "socket";
177 save_errno = errno;
178 continue;
179 }
180
181 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on,
182 sizeof on) < 0) {
183 cause = "SO_REUSEADDR";
184 save_errno = errno;
185 (void)close(s);
186 continue;
187 }
188
189 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
190 cause = "bind";
191 save_errno = errno;
192 (void)close(s);
193 continue;
194 }
195
196 (void)listen(s, TCP_BACKLOG);
197
[6e89d69]198 if ((l = calloc(1, sizeof *l)) == NULL)
[cd7b81d]199 err(EX_UNAVAILABLE, NULL);
[bacf9da]200 event_set(&l->ev, s, EV_READ | EV_PERSIST,
201 icbd_accept, l);
[6e89d69]202 if (event_add(&l->ev, NULL) < 0) {
[cd7b81d]203 syslog(LOG_ERR, "event_add: %m");
204 return (EX_UNAVAILABLE);
205 }
[6e89d69]206 evtimer_set(&l->pause, icbd_paused, l);
[cd7b81d]207
208 nsocks++;
209 }
210
211 freeaddrinfo(res0);
212 }
213
214 if (nsocks == 0) {
215 errno = save_errno;
216 syslog(LOG_ERR, "%s: %m", cause);
217 return (EX_UNAVAILABLE);
218 }
219
[55923b7]220 /* start the logger service */
221 logger_init();
222
[e87ab6d]223 /* initialize resolver */
224 res_init();
[cd7b81d]225
226 if (!foreground)
227 icbd_restrict();
228
[82d3c1f]229 icbd_modupdate();
230
[cd7b81d]231 (void)signal(SIGPIPE, SIG_IGN);
232
233 (void)event_dispatch();
234
235 syslog(LOG_ERR, "event_dispatch: %m");
236
237 return (EX_UNAVAILABLE);
238}
239
240void
241icbd_accept(int fd, short event __attribute__((__unused__)),
[6e89d69]242 void *arg)
[cd7b81d]243{
[6e89d69]244 struct icbd_listener *l = arg;
[cd7b81d]245 struct sockaddr_storage ss;
[6e89d69]246 struct timeval p = { 1, 0 };
[cd7b81d]247 struct icb_session *is;
248 socklen_t ss_len = sizeof ss;
[8ef8c4e]249 int s, on = 1, tos = IPTOS_LOWDELAY;
[cd7b81d]250
251 ss.ss_len = ss_len;
[6e89d69]252 s = accept(fd, (struct sockaddr *)&ss, &ss_len);
253 if (s == -1) {
254 switch (errno) {
255 case EINTR:
256 case EWOULDBLOCK:
257 case ECONNABORTED:
258 return;
259 case EMFILE:
260 case ENFILE:
261 event_del(&l->ev);
262 evtimer_add(&l->pause, &p);
263 return;
264 default:
265 syslog(LOG_ERR, "accept: %m");
266 return;
267 }
[cd7b81d]268 }
[6e89d69]269
[c8c9ccf]270 if (ss.ss_family == AF_INET)
271 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof tos) < 0)
272 syslog(LOG_WARNING, "IP_TOS: %m");
[8ef8c4e]273 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof on) < 0)
274 syslog(LOG_WARNING, "SO_KEEPALIVE: %m");
[cd7b81d]275 if ((is = calloc(1, sizeof *is)) == NULL) {
276 syslog(LOG_ERR, "calloc: %m");
277 (void)close(s);
278 return;
279 }
280 if ((is->bev = bufferevent_new(s, icbd_dispatch, NULL, icbd_ioerr,
281 is)) == NULL) {
282 syslog(LOG_ERR, "bufferevent_new: %m");
283 (void)close(s);
284 free(is);
285 return;
286 }
287 if (bufferevent_enable(is->bev, EV_READ)) {
288 syslog(LOG_ERR, "bufferevent_enable: %m");
289 (void)close(s);
290 bufferevent_free(is->bev);
291 free(is);
292 return;
293 }
294
295 /* save host information */
296 getpeerinfo(is);
297
298 /* start icb conversation */
299 icb_start(is);
300}
301
[6e89d69]302void
303icbd_paused(int fd __attribute__((__unused__)),
304 short events __attribute__((__unused__)), void *arg)
305{
306 struct icbd_listener *l = arg;
307 event_add(&l->ev, NULL);
308}
309
[cd7b81d]310__dead void
311usage(void)
312{
[3dba97d]313 extern char *__progname;
314
[cd7b81d]315 (void)fprintf(stderr, "usage: %s [-46Cdv] [-G group1[,group2,...]] "
[3dba97d]316 "[-L prefix] [-M modtab]\n\t[-S name] [[addr][:port] ...]\n",
317 __progname);
[cd7b81d]318 exit(EX_USAGE);
319}
320
321/*
322 * bufferevent functions
323 */
[e13307d]324void
325icbd_ioerr(struct bufferevent *bev __attribute__((__unused__)), short what,
326 void *arg)
327{
328 struct icb_session *is = (struct icb_session *)arg;
329
330 if (what & EVBUFFER_TIMEOUT)
331 icbd_drop(is, "timeout");
332 else if (what & EVBUFFER_EOF)
333 icbd_drop(is, NULL);
334 else if (what & EVBUFFER_ERROR)
335 icbd_drop(is, (what & EVBUFFER_READ) ? "read error" :
336 "write error");
337}
[cd7b81d]338
339void
340icbd_dispatch(struct bufferevent *bev, void *arg)
341{
342 struct icb_session *is = (struct icb_session *)arg;
[a2fadb4]343 unsigned char length;
[cd7b81d]344
[c9402c3]345 while (EVBUFFER_LENGTH(EVBUFFER_INPUT(bev)) > 0) {
[cd7b81d]346 if (is->length == 0) {
[c9402c3]347 /* read length */
[a2fadb4]348 bufferevent_read(bev, &length, 1);
349 if (length == 0) {
350 /*
351 * An extension has been proposed:
352 * if length is 0, the packet is part of an
353 * "extended packet". The packet should be
354 * treated as if length was 255 and the next
355 * packet received from the sender should be
356 * appended to this packet.
357 *
358 * This server doesn't support this yet.
359 */
[c9402c3]360 icbd_drop(is, "invalid packet");
361 return;
362 }
[a2fadb4]363 is->length = (size_t)length;
364 is->rlen = 0;
[cd7b81d]365 }
[c9402c3]366 /* read as much as we can */
367 is->rlen += bufferevent_read(bev, &is->buffer[is->rlen],
368 is->length);
[cd7b81d]369#ifdef DEBUG
[c9402c3]370 {
371 int i;
372
373 printf("-> read %lu out of %lu from %s:%d:\n",
374 is->rlen, is->length, is->host, is->port);
375 for (i = 0; i < (int)is->rlen; i++)
376 printf(" %02x", (unsigned char)is->buffer[i]);
377 printf("\n");
378 }
[cd7b81d]379#endif
[c9402c3]380 /* see you next time around */
381 if (is->rlen < is->length)
382 return;
[a2fadb4]383 /* null-terminate the data */
384 is->buffer[MIN(is->rlen, ICB_MSGSIZE - 1)] = '\0';
[c9402c3]385 /* process the message in full */
386 icb_input(is);
387 is->rlen = is->length = 0;
388 }
[cd7b81d]389}
390
391void
[7882a6f]392icbd_send(struct icb_session *is, char *buf, ssize_t size)
[cd7b81d]393{
394 if (bufferevent_write(is->bev, buf, size) == -1)
395 syslog(LOG_ERR, "bufferevent_write: %m");
396#ifdef DEBUG
397 {
398 int i;
399
[c9402c3]400 printf("-> wrote %lu to %s:%d:\n", size, is->host, is->port);
[cd7b81d]401 for (i = 0; i < size; i++)
402 printf(" %02x", (unsigned char)buf[i]);
403 printf("\n");
404 }
405#endif
406}
407
408void
409icbd_drop(struct icb_session *is, char *reason)
410{
411 if (reason) {
412 icb_remove(is, reason);
413 icbd_log(is, LOG_DEBUG, reason);
414 } else
415 icb_remove(is, NULL);
416 (void)evbuffer_write(EVBUFFER_OUTPUT(is->bev), EVBUFFER_FD(is->bev));
417 (void)close(EVBUFFER_FD(is->bev));
418 bufferevent_free(is->bev);
419 free(is);
420}
421
422void
423icbd_log(struct icb_session *is, int level, const char *fmt, ...)
424{
425 char buf[512];
426 va_list ap;
427
428 if (!verbose && level == LOG_DEBUG)
429 return;
430
431 va_start(ap, fmt);
432 (void)vsnprintf(buf, sizeof buf, fmt, ap);
433 va_end(ap);
434 if (is)
435 syslog(level, "%s:%u: %s", is->host, is->port, buf);
436 else
437 syslog(level, "%s", buf);
438}
439
440void
441icbd_restrict(void)
442{
443 struct stat sb;
444 struct passwd *pw;
445
446 if ((pw = getpwnam(ICBD_USER)) == NULL) {
447 syslog(LOG_ERR, "No passwd entry for %s", ICBD_USER);
448 exit(EX_NOUSER);
449 }
450
451 if (setusercontext(NULL, pw, pw->pw_uid,
[d554223]452 LOGIN_SETALL & ~LOGIN_SETUSER) < 0)
[cd7b81d]453 exit(EX_NOPERM);
454
455 if (stat(pw->pw_dir, &sb) == -1) {
456 syslog(LOG_ERR, "%s: %m", pw->pw_name);
457 exit(EX_NOPERM);
458 }
459
460 if (sb.st_uid != 0 || (sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
461 syslog(LOG_ERR, "bad directory permissions");
462 exit(EX_NOPERM);
463 }
464
465 if (chroot(pw->pw_dir) < 0) {
466 syslog(LOG_ERR, "%s: %m", pw->pw_dir);
467 exit(EX_UNAVAILABLE);
468 }
469
470 if (chdir("/") < 0) {
471 syslog(LOG_ERR, "/: %m");
472 exit(EX_UNAVAILABLE);
473 }
474
[e54f151]475 if (setuid(pw->pw_uid) < 0) {
476 syslog(LOG_ERR, "%d: %m", pw->pw_uid);
477 exit(EX_NOPERM);
478 }
479
[cd7b81d]480 (void)setproctitle("icbd");
481}
482
483void
484icbd_grplist(char *list)
485{
486 char *s, *s1, *s2;
487 int last = 0;
488
489 if (!list || strlen(list) == 0)
490 return;
491
492 /* "group1[:pass1][,group2[:pass2],...]" */
493 s = list;
494 s1 = s2 = NULL;
495 while (!last && s) {
496 if ((s1 = strchr(s, ',')) != NULL)
497 *s1 = '\0';
498 else {
499 last = 1;
500 s1 = s;
501 }
502 if ((s2 = strchr(s, ':')) != NULL)
503 *s2 = '\0';
504 if (icb_addgroup(NULL, s, s2 ? ++s2 : NULL) == NULL)
505 err(EX_UNAVAILABLE, NULL);
506 s = ++s1;
507 s1 = s2 = NULL;
508 }
509}
510
[1d2125a]511void
[82d3c1f]512icbd_modupdate(void)
[1d2125a]513{
[82d3c1f]514 struct stat st;
[1d2125a]515 FILE *fp;
516 char *buf, *lbuf;
517 size_t len;
518
[82d3c1f]519 if (strlen(modtabpath) == 0)
520 return;
521 if (stat(modtabpath, &st)) {
[709589d]522 syslog(LOG_ERR, "stat %s: %m", modtabpath);
[82d3c1f]523 return;
524 }
525 /* see if there are any changes */
526 if (timespeccmp(&st.st_mtim, &modtabst.st_mtim, ==) ||
527 st.st_size == 0)
528 return;
529
[709589d]530 if ((fp = fopen(modtabpath, "r")) == NULL) {
531 syslog(LOG_ERR, "open %s: %m", modtabpath);
532 return;
533 }
[1d2125a]534
[2cdab10]535 modtabcnt = 0;
[1d2125a]536 bzero(modtab, ICB_MTABLEN * ICB_MAXNICKLEN);
537 lbuf = NULL;
538 while ((buf = fgetln(fp, &len)) && modtabcnt < ICB_MTABLEN) {
539 if (buf[len - 1] == '\n')
540 buf[len - 1] = '\0';
541 else {
542 /* EOF without EOL, copy and add the NUL */
543 if ((lbuf = malloc(len + 1)) == NULL)
544 err(1, NULL);
545 memcpy(lbuf, buf, len);
546 lbuf[len] = '\0';
547 buf = lbuf;
548 }
549 while (buf[0] == ' ' || buf[0] == '\t')
550 buf++;
551 if (buf[0] == '#' || buf[0] == '\0')
552 continue;
553 strlcpy(modtab[modtabcnt++], buf, ICB_MAXNICKLEN);
554 }
555 free(lbuf);
556
557 qsort(modtab, modtabcnt, ICB_MAXNICKLEN,
558 (int (*)(const void *, const void *))strcmp);
559
560 fclose(fp);
[709589d]561
562 memcpy(&modtabst, &st, sizeof modtabst);
[1d2125a]563}
564
[cd7b81d]565time_t
566getmonotime(void)
567{
568 struct timespec ts;
569
570 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
571 syslog(LOG_ERR, "%m");
572 exit(EX_OSERR);
573 }
574 return (ts.tv_sec);
575}
576
577void
578getpeerinfo(struct icb_session *is)
579{
580 struct sockaddr_storage ss;
[b4049f9]581 struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
582 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
[cd7b81d]583 socklen_t ss_len = sizeof ss;
584
585 bzero(&ss, sizeof ss);
586 if (getpeername(EVBUFFER_FD(is->bev), (struct sockaddr *)&ss,
587 &ss_len) != 0)
588 return;
589
590 is->port = 0;
591 switch (ss.ss_family) {
592 case AF_INET:
[b4049f9]593 is->port = ntohs(sin->sin_port);
[cd7b81d]594 break;
595
596 case AF_INET6:
[b4049f9]597 is->port = ntohs(sin6->sin6_port);
[cd7b81d]598 break;
599 }
600
[b4049f9]601 inet_ntop(ss.ss_family, ss.ss_family == AF_INET ?
602 (void *)&sin->sin_addr : (void *)&sin6->sin6_addr,
603 is->host, sizeof is->host);
604
[e87ab6d]605 dns_rresolv(is, (struct sockaddr *)&ss);
[cd7b81d]606}
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