source: code/icb.c@ a6b8c8d

Last change on this file since a6b8c8d was f3c60e6, checked in by Mike Belopuhov <mike@…>, 11 years ago

After some deliberation we have decided that if modtab is enabled
then it should be possible to steal the moderation.
  • Property mode set to 100644
File size: 14.8 KB
Line 
1/*
2 * Copyright (c) 2009, 2010, 2013, 2014 Mike Belopuhov
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <sys/param.h>
18#include <sys/queue.h>
19#include <stdarg.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <syslog.h>
24#include <unistd.h>
25#include <ctype.h>
26#include <event.h>
27#include <vis.h>
28
29#include "icb.h"
30#include "icbd.h"
31
32extern int creategroups;
33extern char srvname[MAXHOSTNAMELEN];
34
35void icb_command(struct icb_session *, char *, char *);
36void icb_groupmsg(struct icb_session *, char *);
37void icb_login(struct icb_session *, char *, char *, char *);
38int icb_dowho(struct icb_session *, struct icb_group *);
39char *icb_nextfield(char **);
40
41/*
42 * icb_init: initializes pointers to callbacks
43 */
44void
45icb_init(struct icbd_callbacks *ic)
46{
47 icb_drop = ic->drop;
48 icb_log = ic->log;
49 icb_send = ic->send;
50
51 LIST_INIT(&groups);
52
53 if (strlen(srvname) == 0)
54 (void)gethostname(srvname, sizeof srvname);
55 /*
56 * MAXHOSTNAMELEN is usually greater than what we
57 * can actually send, hence truncation:
58 */
59 if (strlen(srvname) > 200)
60 srvname[200] = '\0';
61}
62
63/*
64 * icb_start: called upon accepting a new connection, greets new client
65 */
66void
67icb_start(struct icb_session *is)
68{
69 icb_sendfmt(is, "%c%c%c%s%c%s", ICB_M_PROTO, '1', ICB_M_SEP, srvname,
70 ICB_M_SEP, "icbd");
71 SETF(is->flags, ICB_SF_PROTOSENT);
72}
73
74/*
75 * icb_input: main input processing routine
76 */
77void
78icb_input(struct icb_session *is)
79{
80 char *msg = is->buffer;
81 char type;
82
83 is->last = getmonotime();
84 type = msg[1];
85 msg += 2;
86 if (!ISSETF(is->flags, ICB_SF_LOGGEDIN) && type != ICB_M_LOGIN) {
87 icb_error(is, "Not logged in");
88 return;
89 }
90 switch (type) {
91 case ICB_M_LOGIN: {
92 char *nick, *group, *client, *cmd;
93
94 client = icb_nextfield(&msg);
95 nick = icb_nextfield(&msg);
96 group = icb_nextfield(&msg);
97 cmd = icb_nextfield(&msg);
98 if (strlen(cmd) > 0 && cmd[0] == 'w') {
99 icb_error(is, "Command not implemented");
100 icb_drop(is, NULL);
101 return;
102 }
103 if (strlen(cmd) == 0 || strcmp(cmd, "login") != 0) {
104 icb_error(is, "Malformed login packet");
105 icb_drop(is, NULL);
106 return;
107 }
108 icb_login(is, group, nick, client);
109 break;
110 }
111 case ICB_M_OPEN: {
112 char *grpmsg;
113
114 grpmsg = icb_nextfield(&msg);
115 icb_groupmsg(is, grpmsg);
116 break;
117 }
118 case ICB_M_COMMAND: {
119 char *cmd, *arg;
120
121 cmd = icb_nextfield(&msg);
122 arg = icb_nextfield(&msg);
123 icb_command(is, cmd, arg);
124 break;
125 }
126 case ICB_M_PONG: {
127 icb_sendfmt(is, "%c", ICB_M_PING);
128 break;
129 }
130 case ICB_M_PROTO:
131 case ICB_M_NOOP:
132 /* ignore */
133 break;
134 default:
135 /* everything else is not valid */
136 icb_error(is, "Bummer. This is a bummer, man.");
137 }
138}
139
140/*
141 * icb_login: handles login ('a') packets
142 */
143void
144icb_login(struct icb_session *is, char *grp, char *nick, char *client)
145{
146 char *defgrp = "1";
147 struct icb_group *ig;
148 struct icb_session *s;
149 char group[ICB_MAXGRPLEN];
150
151 if (!nick || strlen(nick) == 0 ||
152 icb_vis(is->nick, nick, ICB_MAXNICKLEN, VIS_SP)) {
153 icb_error(is, "Invalid nick");
154 icb_drop(is, NULL);
155 return;
156 }
157 if (!grp || strlen(grp) == 0)
158 strlcpy(group, defgrp, ICB_MAXGRPLEN);
159 else
160 icb_vis(group, grp, ICB_MAXNICKLEN, VIS_SP);
161 LIST_FOREACH(ig, &groups, entry) {
162 if (strcmp(ig->name, group) == 0)
163 break;
164 }
165 if (ig == NULL) {
166 if (!creategroups) {
167 icb_error(is, "Invalid group %s", group);
168 icb_drop(is, NULL);
169 return;
170 } else {
171 if ((ig = icb_addgroup(is, group, NULL)) == NULL) {
172 icb_error(is, "Can't create group %s", group);
173 return;
174 }
175 icb_log(NULL, LOG_DEBUG, "%s created group %s",
176 is->nick, group);
177 }
178 }
179 LIST_FOREACH(s, &ig->sess, entry) {
180 if (strcmp(s->nick, is->nick) == 0) {
181 icb_error(is, "Nick is already in use");
182 icb_drop(is, NULL);
183 return;
184 }
185 }
186
187 if (client && strlen(client) > 0)
188 icb_vis(is->client, client, sizeof is->client, VIS_SP);
189 is->group = ig;
190 is->login = time(NULL);
191 is->last = getmonotime();
192
193 /* notify group */
194 icb_status_group(ig, NULL, STATUS_SIGNON, "%s (%s@%s) entered group",
195 is->nick, is->client, is->host);
196
197 CLRF(is->flags, ICB_SF_PROTOSENT);
198 SETF(is->flags, ICB_SF_LOGGEDIN);
199
200 LIST_INSERT_HEAD(&ig->sess, is, entry);
201
202 /* acknowledge successful login */
203 icb_sendfmt(is, "%c", ICB_M_LOGIN);
204
205 /* notify user */
206 icb_status(is, STATUS_STATUS, "You are now in group %s%s", ig->name,
207 icb_ismod(ig, is) ? " as moderator" : "");
208
209 /* send user a topic name */
210 if (strlen(ig->topic) > 0)
211 icb_status(is, STATUS_TOPIC, "Topic for %s is \"%s\"",
212 ig->name, ig->topic);
213}
214
215/*
216 * icb_groupmsg: handles open message ('b') packets
217 */
218void
219icb_groupmsg(struct icb_session *is, char *msg)
220{
221 char buf[ICB_MSGSIZE];
222 struct icb_group *ig = is->group;
223 struct icb_session *s;
224 int buflen = 1;
225
226 if (strlen(msg) == 0) {
227 icb_error(is, "Empty message");
228 return;
229 }
230
231 buflen += snprintf(&buf[1], sizeof buf - 1, "%c%s%c%s", ICB_M_OPEN,
232 is->nick, ICB_M_SEP, msg);
233 buf[0] = buflen;
234
235 logger(ig->name, is->nick, msg);
236
237 LIST_FOREACH(s, &ig->sess, entry) {
238 if (s == is)
239 continue;
240 icb_send(s, buf, buflen + 1);
241 }
242}
243
244/*
245 * icb_privmsg: handles personal message ('c') packets
246 */
247void
248icb_privmsg(struct icb_session *is, char *to, char *msg)
249{
250 struct icb_group *ig = is->group;
251 struct icb_session *s;
252 char whom[ICB_MAXNICKLEN];
253
254 icb_vis(whom, to, ICB_MAXNICKLEN, VIS_SP);
255
256 /* try home group first */
257 LIST_FOREACH(s, &ig->sess, entry) {
258 if (strcmp(s->nick, whom) == 0)
259 break;
260 }
261 if (!s) {
262 /* try all groups until the first match */
263 LIST_FOREACH(ig, &groups, entry) {
264 LIST_FOREACH(s, &ig->sess, entry) {
265 if (strcmp(s->nick, whom) == 0)
266 break;
267 }
268 if (s)
269 break;
270 }
271 if (!s) {
272 icb_error(is, "No such user %s", whom);
273 return;
274 }
275 }
276 icb_sendfmt(s, "%c%s%c%s", ICB_M_PERSONAL, is->nick, ICB_M_SEP, msg);
277}
278
279/*
280 * icb_command: handles command ('h') packets
281 */
282void
283icb_command(struct icb_session *is, char *cmd, char *arg)
284{
285 void (*handler)(struct icb_session *, char *);
286 char command[32]; /* XXX */
287
288 icb_vis(command, cmd, sizeof command, VIS_SP);
289
290 if ((handler = icb_cmd_lookup(command)) == NULL) {
291 icb_error(is, "Unsupported command: %s", command);
292 return;
293 }
294 handler(is, arg);
295}
296
297/*
298 * icb_cmdout: sends out command output ('i') packets, called from the
299 * command handlers
300 */
301void
302icb_cmdout(struct icb_session *is, int type, char *outmsg)
303{
304 char *otype = NULL;
305
306 switch (type) {
307 case CMDOUT_CO:
308 otype = "co";
309 break;
310 case CMDOUT_EC:
311 otype = "ec";
312 break;
313 case CMDOUT_WG:
314 otype = "wg";
315 break;
316 case CMDOUT_WH:
317 otype = "wh";
318 break;
319 case CMDOUT_WL:
320 otype = "wl";
321 break;
322 default:
323 icb_log(is, LOG_ERR, "unknown cmdout type");
324 return;
325 }
326 if (outmsg)
327 icb_sendfmt(is, "%c%s%c%s", ICB_M_CMDOUT, otype, ICB_M_SEP,
328 outmsg);
329 else
330 icb_sendfmt(is, "%c%s", ICB_M_CMDOUT, otype);
331}
332
333/*
334 * icb_status: sends a status message ('d') to the client
335 */
336void
337icb_status(struct icb_session *is, int type, const char *fmt, ...)
338{
339 va_list ap;
340 char buf[ICB_MSGSIZE];
341 int buflen = 1;
342 static const struct {
343 int type;
344 const char *msg;
345 } msgtab[] = {
346 { STATUS_ARRIVE, "Arrive" },
347 { STATUS_BOOT, "Boot" },
348 { STATUS_DEPART, "Depart" },
349 { STATUS_HELP, "Help" },
350 { STATUS_NAME, "Name" },
351 { STATUS_NOBEEP, "No-Beep" },
352 { STATUS_NOTIFY, "Notify" },
353 { STATUS_SIGNON, "Sign-on" },
354 { STATUS_SIGNOFF, "Sign-off" },
355 { STATUS_STATUS, "Status" },
356 { STATUS_TOPIC, "Topic" },
357 { STATUS_WARNING, "Warning" },
358 { 0, NULL }
359 };
360
361 if (type < 0 || type > (int)nitems(msgtab) - 1)
362 return;
363 va_start(ap, fmt);
364 buflen += snprintf(&buf[1], sizeof buf - 1, "%c%s%c", ICB_M_STATUS,
365 msgtab[type].msg, ICB_M_SEP);
366 buflen += vsnprintf(&buf[buflen], sizeof buf - buflen, fmt, ap);
367 buf[0] = buflen;
368 va_end(ap);
369 icb_send(is, buf, buflen + 1);
370}
371
372/*
373 * icb_status: sends a status message ('d') to the group except of the
374 * "ex" if it's not NULL
375 */
376void
377icb_status_group(struct icb_group *ig, struct icb_session *ex, int type,
378 const char *fmt, ...)
379{
380 char buf[ICB_MSGSIZE];
381 va_list ap;
382 struct icb_session *s;
383
384 va_start(ap, fmt);
385 (void)vsnprintf(buf, sizeof buf, fmt, ap);
386 LIST_FOREACH(s, &ig->sess, entry) {
387 if (ex && s == ex)
388 continue;
389 icb_status(s, type, buf);
390 }
391 logger(ig->name, "", buf);
392 icb_log(NULL, LOG_DEBUG, "%s", buf);
393 va_end(ap);
394}
395
396/*
397 * icb_error: sends an error message ('e') to the client
398 */
399void
400icb_error(struct icb_session *is, const char *fmt, ...)
401{
402 char buf[ICB_MSGSIZE];
403 va_list ap;
404 int buflen = 1;
405
406 va_start(ap, fmt);
407 buflen += vsnprintf(&buf[2], sizeof buf - 2, fmt, ap);
408 va_end(ap);
409 buf[0] = ++buflen; /* account for ICB_M_ERROR */
410 buf[1] = ICB_M_ERROR;
411 icb_send(is, buf, buflen + 1);
412 icb_log(is, LOG_DEBUG, "%s", buf + 2);
413}
414
415/*
416 * icb_remove: removes a session from the associated group
417 */
418void
419icb_remove(struct icb_session *is, char *reason)
420{
421 if (is->group) {
422 if (icb_ismod(is->group, is))
423 (void)icb_pass(is->group, is, NULL);
424 LIST_REMOVE(is, entry);
425 if (reason)
426 icb_status_group(is->group, NULL, STATUS_SIGNOFF,
427 "%s (%s@%s) just left: %s", is->nick, is->client,
428 is->host, reason);
429 else
430 icb_status_group(is->group, NULL, STATUS_SIGNOFF,
431 "%s (%s@%s) just left", is->nick, is->client,
432 is->host);
433 }
434}
435
436/*
437 * icb_addgroup: adds a new group to the list
438 */
439struct icb_group *
440icb_addgroup(struct icb_session *is, char *name, char *mpass)
441{
442 struct icb_group *ig;
443
444 if ((ig = calloc(1, sizeof *ig)) == NULL)
445 return (NULL);
446 strlcpy(ig->name, name, sizeof ig->name);
447 if (mpass)
448 strlcpy(ig->mpass, mpass, sizeof ig->mpass);
449 if (is)
450 ig->mod = is;
451 LIST_INIT(&ig->sess);
452 LIST_INSERT_HEAD(&groups, ig, entry);
453 return (ig);
454}
455
456#ifdef notused
457/*
458 * icb_delgroup: removes a group from the list
459 */
460void
461icb_delgroup(struct icb_group *ig)
462{
463 struct icb_session *s;
464
465 /* well, i guess we should kick out participants! ;-) */
466 LIST_FOREACH(s, &ig->sess, entry) {
467 icb_status(s, STATUS_WARNING, "Group dismissed");
468 s->group = NULL;
469 }
470 LIST_REMOVE(ig, entry);
471 bzero(ig, sizeof ig); /* paranoic thing, obviously */
472 free(ig);
473}
474#endif
475
476/*
477 * icb_dowho: a helper function that sends out a group header as a command
478 * output and user information in the "wl" format
479 */
480int
481icb_dowho(struct icb_session *is, struct icb_group *ig)
482{
483 char buf[ICB_MSGSIZE];
484 struct icb_session *s;
485 int nusers = 0;
486
487 icb_cmdout(is, CMDOUT_CO, " ");
488 snprintf(buf, sizeof buf, "Group: %-8s (%cvl) Mod: %-13s Topic: %s",
489 ig->name, ig->mod ? 'm' : 'p', ig->mod ? ig->mod->nick : "(None)",
490 strlen(ig->topic) > 0 ? ig->topic : "(None)");
491 icb_cmdout(is, CMDOUT_CO, buf);
492 LIST_FOREACH(s, &ig->sess, entry) {
493 (void)snprintf(buf, sizeof buf,
494 "%c%c%s%c%lld%c0%c%lld%c%s%c%s%c%s",
495 icb_ismod(ig, s) ? 'm' : ' ', ICB_M_SEP,
496 s->nick, ICB_M_SEP, getmonotime() - s->last,
497 ICB_M_SEP, ICB_M_SEP, s->login, ICB_M_SEP,
498 s->client, ICB_M_SEP, s->host, ICB_M_SEP, " ");
499 icb_cmdout(is, CMDOUT_WL, buf);
500 nusers++;
501 }
502 return (nusers);
503}
504
505/*
506 * icb_who: sends a list of users of either the specified group or all
507 * groups found on the server
508 */
509void
510icb_who(struct icb_session *is, struct icb_group *ig)
511{
512 char buf[ICB_MSGSIZE];
513 struct icb_group *g;
514
515 if (!ig) {
516 int nusers = 0, ngroups = 0;
517
518 LIST_FOREACH(g, &groups, entry) {
519 nusers += icb_dowho(is, g);
520 ngroups++;
521 }
522 if (nusers > 0) {
523 (void)snprintf(buf, sizeof buf,
524 "Total: %d %s in %d %s",
525 nusers, nusers > 1 ? "users" : "user",
526 ngroups, ngroups > 1 ? "groups" : "group");
527 } else
528 (void)snprintf(buf, sizeof buf, "No users found.");
529 icb_cmdout(is, CMDOUT_CO, buf);
530 } else
531 (void)icb_dowho(is, ig);
532}
533
534/*
535 * icb_ismod: checks whether group is moderated by "is"
536 */
537inline int
538icb_ismod(struct icb_group *ig, struct icb_session *is)
539{
540 return (ig->mod == is);
541}
542
543/*
544 * icb_modpermit: checks user against the moderators table if it has
545 * been populated
546 */
547int
548icb_modpermit(struct icb_session *is, int enforce)
549{
550 extern char modtab[ICB_MTABLEN][ICB_MAXNICKLEN];
551 extern int modtabcnt;
552
553 if ((enforce ? 0 : modtabcnt == 0) ||
554 bsearch(is->nick, modtab, modtabcnt, ICB_MAXNICKLEN,
555 (int (*)(const void *, const void *))strcmp))
556 return (1);
557 return (0);
558}
559
560/*
561 * icb_pass: passes moderation of group "ig" from "from" to "to",
562 * returns -1 if "from" is not a moderator, 1 if passed
563 * to "to" and 0 otherwise (no moderator or passed to the
564 * internal bot)
565 */
566int
567icb_pass(struct icb_group *ig, struct icb_session *from,
568 struct icb_session *to)
569{
570 if (ig->mod && ig->mod != from)
571 return (-1);
572 if (!from && !to)
573 return (-1);
574 ig->mod = to;
575 if (to)
576 icb_status(to, STATUS_NOTIFY, "%s just passed you moderation"
577 " of %s", from ? from->nick : "server", ig->name);
578 icb_status_group(ig, to, STATUS_NOTIFY, "%s has passed moderation "
579 "to %s", from ? from->nick : "server", to ? to->nick : "server");
580 return (1);
581}
582
583/*
584 * icb_nextfield: advances through a given buffer returning pointer to the
585 * beginning of the icb field or an empty string otherwise;
586 * cleans up trailing spaces
587 */
588char *
589icb_nextfield(char **buf)
590{
591 char *start = *buf;
592 char *end = NULL;
593
594 while (*buf && **buf != '\0' && **buf != ICB_M_SEP)
595 (*buf)++;
596 if (*buf && **buf == ICB_M_SEP) {
597 **buf = '\0';
598 end = *buf;
599 (*buf)++;
600 } else
601 end = *buf;
602 while (end && *(--end) == ' ' && end > start)
603 *end = '\0';
604 return (start);
605}
606
607/*
608 * icb_sendfmt: formats a string and sends it over
609 */
610void
611icb_sendfmt(struct icb_session *is, const char *fmt, ...)
612{
613 char buf[ICB_MSGSIZE];
614 va_list ap;
615 int buflen = 1;
616
617 va_start(ap, fmt);
618 buflen += vsnprintf(&buf[1], sizeof buf - 1, fmt, ap);
619 va_end(ap);
620 buf[0] = buflen;
621 icb_send(is, buf, buflen + 1);
622}
623
624/*
625 * icb_vis: strnvis-like function that escapes percentages as well
626 */
627int
628icb_vis(char *dst, const char *src, size_t dstsize, int flags)
629{
630 int si = 0, di = 0, td;
631
632 while ((size_t)di < dstsize && src[si] != '\0') {
633 if (src[si] == '%')
634 dst[di++] = '%', dst[di] = '%';
635 else if (src[si] == ' ' && flags & VIS_SP)
636 dst[di] = '_';
637 else if (isgraph(src[si]) || src[si] == ' ')
638 dst[di] = src[si];
639 else {
640 td = snprintf(&dst[di], dstsize - di,
641 "\\%03o", (unsigned char)src[si]);
642 di += td - 1;
643 }
644 si++, di++;
645 }
646 dst[MIN((size_t)di, dstsize)] = '\0';
647 return (0);
648}
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