source: code/icb.c@ 87dc6ac

Last change on this file since 87dc6ac was 87dc6ac, checked in by Mike Belopuhov <mike@…>, 11 years ago

Remove an strlcpy leftover
  • Property mode set to 100644
File size: 14.8 KB
RevLine 
[cd7b81d]1/*
[626f420]2 * Copyright (c) 2009, 2010, 2013, 2014 Mike Belopuhov
[cd7b81d]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>
[626f420]25#include <ctype.h>
[cd7b81d]26#include <event.h>
[b7bc432]27#include <vis.h>
[cd7b81d]28
29#include "icb.h"
30#include "icbd.h"
31
32extern int creategroups;
[a785c27]33extern char srvname[MAXHOSTNAMELEN];
[cd7b81d]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 *);
[4284008]38int icb_dowho(struct icb_session *, struct icb_group *);
[1d2125a]39int icb_modpermit(struct icb_session *);
[cd7b81d]40char *icb_nextfield(char **);
41
42/*
43 * icb_init: initializes pointers to callbacks
44 */
45void
46icb_init(struct icbd_callbacks *ic)
47{
48 icb_drop = ic->drop;
49 icb_log = ic->log;
50 icb_send = ic->send;
51
52 LIST_INIT(&groups);
[a785c27]53
54 if (strlen(srvname) == 0)
55 (void)gethostname(srvname, sizeof srvname);
56 /*
57 * MAXHOSTNAMELEN is usually greater than what we
58 * can actually send, hence truncation:
59 */
60 if (strlen(srvname) > 200)
61 srvname[200] = '\0';
[cd7b81d]62}
63
64/*
65 * icb_start: called upon accepting a new connection, greets new client
66 */
67void
68icb_start(struct icb_session *is)
69{
[a785c27]70 icb_sendfmt(is, "%c%c%c%s%c%s", ICB_M_PROTO, '1', ICB_M_SEP, srvname,
[cd7b81d]71 ICB_M_SEP, "icbd");
72 SETF(is->flags, ICB_SF_PROTOSENT);
73}
74
75/*
76 * icb_input: main input processing routine
77 */
78void
79icb_input(struct icb_session *is)
80{
81 char *msg = is->buffer;
82 char type;
83
84 is->last = getmonotime();
85 type = msg[1];
86 msg += 2;
87 if (!ISSETF(is->flags, ICB_SF_LOGGEDIN) && type != ICB_M_LOGIN) {
88 icb_error(is, "Not logged in");
89 return;
90 }
91 switch (type) {
92 case ICB_M_LOGIN: {
93 char *nick, *group, *client, *cmd;
94
95 client = icb_nextfield(&msg);
96 nick = icb_nextfield(&msg);
97 group = icb_nextfield(&msg);
98 cmd = icb_nextfield(&msg);
99 if (strlen(cmd) > 0 && cmd[0] == 'w') {
100 icb_error(is, "Command not implemented");
101 icb_drop(is, NULL);
102 return;
103 }
[1da9ee5]104 if (strlen(cmd) == 0 || strcmp(cmd, "login") != 0) {
105 icb_error(is, "Malformed login packet");
106 icb_drop(is, NULL);
107 return;
108 }
[cd7b81d]109 icb_login(is, group, nick, client);
110 break;
111 }
112 case ICB_M_OPEN: {
113 char *grpmsg;
114
115 grpmsg = icb_nextfield(&msg);
116 icb_groupmsg(is, grpmsg);
117 break;
118 }
119 case ICB_M_COMMAND: {
120 char *cmd, *arg;
121
122 cmd = icb_nextfield(&msg);
123 arg = icb_nextfield(&msg);
124 icb_command(is, cmd, arg);
125 break;
126 }
[1fb1bbe]127 case ICB_M_PONG: {
128 icb_sendfmt(is, "%c", ICB_M_PING);
129 break;
130 }
[cd7b81d]131 case ICB_M_PROTO:
132 case ICB_M_NOOP:
133 /* ignore */
134 break;
135 default:
136 /* everything else is not valid */
137 icb_error(is, "Bummer. This is a bummer, man.");
138 }
139}
140
141/*
142 * icb_login: handles login ('a') packets
143 */
144void
[626f420]145icb_login(struct icb_session *is, char *grp, char *nick, char *client)
[cd7b81d]146{
147 char *defgrp = "1";
148 struct icb_group *ig;
149 struct icb_session *s;
[626f420]150 char group[ICB_MAXGRPLEN];
[cd7b81d]151
[626f420]152 if (!nick || strlen(nick) == 0 ||
[b7bc432]153 icb_vis(is->nick, nick, ICB_MAXNICKLEN, VIS_SP)) {
[cd7b81d]154 icb_error(is, "Invalid nick");
155 icb_drop(is, NULL);
156 return;
157 }
[626f420]158 if (!grp || strlen(grp) == 0)
159 strlcpy(group, defgrp, ICB_MAXGRPLEN);
160 else
[b7bc432]161 icb_vis(group, grp, ICB_MAXNICKLEN, VIS_SP);
[cd7b81d]162 LIST_FOREACH(ig, &groups, entry) {
163 if (strcmp(ig->name, group) == 0)
164 break;
165 }
166 if (ig == NULL) {
167 if (!creategroups) {
168 icb_error(is, "Invalid group %s", group);
169 icb_drop(is, NULL);
170 return;
171 } else {
172 if ((ig = icb_addgroup(is, group, NULL)) == NULL) {
173 icb_error(is, "Can't create group %s", group);
174 return;
175 }
176 icb_log(NULL, LOG_DEBUG, "%s created group %s",
[626f420]177 is->nick, group);
[cd7b81d]178 }
179 }
180 LIST_FOREACH(s, &ig->sess, entry) {
[626f420]181 if (strcmp(s->nick, is->nick) == 0) {
[cd7b81d]182 icb_error(is, "Nick is already in use");
183 icb_drop(is, NULL);
184 return;
185 }
186 }
187
188 if (client && strlen(client) > 0)
[b7bc432]189 icb_vis(is->client, client, sizeof is->client, VIS_SP);
[cd7b81d]190 is->group = ig;
191 is->login = time(NULL);
192 is->last = getmonotime();
193
194 /* notify group */
195 icb_status_group(ig, NULL, STATUS_SIGNON, "%s (%s@%s) entered group",
196 is->nick, is->client, is->host);
197
198 CLRF(is->flags, ICB_SF_PROTOSENT);
199 SETF(is->flags, ICB_SF_LOGGEDIN);
200
201 LIST_INSERT_HEAD(&ig->sess, is, entry);
202
203 /* acknowledge successful login */
204 icb_sendfmt(is, "%c", ICB_M_LOGIN);
205
206 /* notify user */
207 icb_status(is, STATUS_STATUS, "You are now in group %s%s", ig->name,
[4284008]208 icb_ismod(ig, is) ? " as moderator" : "");
[cd7b81d]209
210 /* send user a topic name */
211 if (strlen(ig->topic) > 0)
212 icb_status(is, STATUS_TOPIC, "Topic for %s is \"%s\"",
213 ig->name, ig->topic);
214}
215
216/*
217 * icb_groupmsg: handles open message ('b') packets
218 */
219void
220icb_groupmsg(struct icb_session *is, char *msg)
221{
222 char buf[ICB_MSGSIZE];
223 struct icb_group *ig = is->group;
224 struct icb_session *s;
225 int buflen = 1;
226
227 if (strlen(msg) == 0) {
228 icb_error(is, "Empty message");
229 return;
230 }
231
232 buflen += snprintf(&buf[1], sizeof buf - 1, "%c%s%c%s", ICB_M_OPEN,
233 is->nick, ICB_M_SEP, msg);
234 buf[0] = buflen;
235
[45bd56a]236 logger(ig->name, is->nick, msg);
[55923b7]237
[cd7b81d]238 LIST_FOREACH(s, &ig->sess, entry) {
239 if (s == is)
240 continue;
241 icb_send(s, buf, buflen + 1);
242 }
243}
244
245/*
246 * icb_privmsg: handles personal message ('c') packets
247 */
248void
[626f420]249icb_privmsg(struct icb_session *is, char *to, char *msg)
[cd7b81d]250{
251 struct icb_group *ig = is->group;
252 struct icb_session *s;
[626f420]253 char whom[ICB_MAXNICKLEN];
254
[b7bc432]255 icb_vis(whom, to, ICB_MAXNICKLEN, VIS_SP);
[cd7b81d]256
[efa8586]257 /* try home group first */
[cd7b81d]258 LIST_FOREACH(s, &ig->sess, entry) {
259 if (strcmp(s->nick, whom) == 0)
260 break;
261 }
262 if (!s) {
[efa8586]263 /* try all groups until the first match */
264 LIST_FOREACH(ig, &groups, entry) {
265 LIST_FOREACH(s, &ig->sess, entry) {
266 if (strcmp(s->nick, whom) == 0)
267 break;
268 }
269 if (s)
270 break;
271 }
272 if (!s) {
273 icb_error(is, "No such user %s", whom);
274 return;
275 }
[cd7b81d]276 }
277 icb_sendfmt(s, "%c%s%c%s", ICB_M_PERSONAL, is->nick, ICB_M_SEP, msg);
278}
279
280/*
281 * icb_command: handles command ('h') packets
282 */
283void
284icb_command(struct icb_session *is, char *cmd, char *arg)
285{
286 void (*handler)(struct icb_session *, char *);
[626f420]287 char command[32]; /* XXX */
[cd7b81d]288
[b7bc432]289 icb_vis(command, cmd, sizeof command, VIS_SP);
[626f420]290
291 if ((handler = icb_cmd_lookup(command)) == NULL) {
292 icb_error(is, "Unsupported command: %s", command);
[cd7b81d]293 return;
294 }
295 handler(is, arg);
296}
297
298/*
299 * icb_cmdout: sends out command output ('i') packets, called from the
300 * command handlers
301 */
302void
303icb_cmdout(struct icb_session *is, int type, char *outmsg)
304{
305 char *otype = NULL;
306
307 switch (type) {
308 case CMDOUT_CO:
309 otype = "co";
310 break;
311 case CMDOUT_EC:
312 otype = "ec";
313 break;
314 case CMDOUT_WG:
315 otype = "wg";
316 break;
[4284008]317 case CMDOUT_WH:
318 otype = "wh";
319 break;
320 case CMDOUT_WL:
321 otype = "wl";
322 break;
[cd7b81d]323 default:
324 icb_log(is, LOG_ERR, "unknown cmdout type");
325 return;
326 }
[4284008]327 if (outmsg)
328 icb_sendfmt(is, "%c%s%c%s", ICB_M_CMDOUT, otype, ICB_M_SEP,
329 outmsg);
330 else
331 icb_sendfmt(is, "%c%s", ICB_M_CMDOUT, otype);
[cd7b81d]332}
333
334/*
335 * icb_status: sends a status message ('d') to the client
336 */
337void
338icb_status(struct icb_session *is, int type, const char *fmt, ...)
339{
340 va_list ap;
341 char buf[ICB_MSGSIZE];
342 int buflen = 1;
343 static const struct {
344 int type;
345 const char *msg;
346 } msgtab[] = {
347 { STATUS_ARRIVE, "Arrive" },
348 { STATUS_BOOT, "Boot" },
349 { STATUS_DEPART, "Depart" },
[9195a6a]350 { STATUS_HELP, "Help" },
[cd7b81d]351 { STATUS_NAME, "Name" },
[bf02a60]352 { STATUS_NOBEEP, "No-Beep" },
[cd7b81d]353 { STATUS_NOTIFY, "Notify" },
354 { STATUS_SIGNON, "Sign-on" },
355 { STATUS_SIGNOFF, "Sign-off" },
356 { STATUS_STATUS, "Status" },
357 { STATUS_TOPIC, "Topic" },
358 { STATUS_WARNING, "Warning" },
[1022119]359 { 0, NULL }
[cd7b81d]360 };
361
362 if (type < 0 || type > (int)nitems(msgtab) - 1)
363 return;
364 va_start(ap, fmt);
365 buflen += snprintf(&buf[1], sizeof buf - 1, "%c%s%c", ICB_M_STATUS,
366 msgtab[type].msg, ICB_M_SEP);
367 buflen += vsnprintf(&buf[buflen], sizeof buf - buflen, fmt, ap);
368 buf[0] = buflen;
369 va_end(ap);
370 icb_send(is, buf, buflen + 1);
371}
372
373/*
374 * icb_status: sends a status message ('d') to the group except of the
375 * "ex" if it's not NULL
376 */
377void
378icb_status_group(struct icb_group *ig, struct icb_session *ex, int type,
379 const char *fmt, ...)
380{
381 char buf[ICB_MSGSIZE];
382 va_list ap;
383 struct icb_session *s;
384
385 va_start(ap, fmt);
386 (void)vsnprintf(buf, sizeof buf, fmt, ap);
387 LIST_FOREACH(s, &ig->sess, entry) {
388 if (ex && s == ex)
389 continue;
390 icb_status(s, type, buf);
391 }
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) {
[4284008]422 if (icb_ismod(is->group, is))
[cd7b81d]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)
[4284008]450 ig->mod = is;
[cd7b81d]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/*
[4284008]477 * icb_dowho: a helper function that sends out a group header as a command
478 * output and user information in the "wl" format
[cd7b81d]479 */
[4284008]480int
481icb_dowho(struct icb_session *is, struct icb_group *ig)
[cd7b81d]482{
483 char buf[ICB_MSGSIZE];
484 struct icb_session *s;
[4284008]485 int nusers = 0;
[cd7b81d]486
[4284008]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);
[cd7b81d]492 LIST_FOREACH(s, &ig->sess, entry) {
493 (void)snprintf(buf, sizeof buf,
[bf02a60]494 "%c%c%s%c%lld%c0%c%lld%c%s%c%s%c%s",
[4284008]495 icb_ismod(ig, s) ? 'm' : ' ', ICB_M_SEP,
[cd7b81d]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);
[4284008]500 nusers++;
[cd7b81d]501 }
[4284008]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);
[cd7b81d]532}
533
534/*
[4284008]535 * icb_ismod: checks whether group is moderated by "is"
[cd7b81d]536 */
[626f420]537inline int
[4284008]538icb_ismod(struct icb_group *ig, struct icb_session *is)
[cd7b81d]539{
[626f420]540 return (ig->mod == is);
[cd7b81d]541}
542
[1d2125a]543/*
544 * icb_modpermit: checks user against the moderators table if it has
545 * been populated
546 */
547int
548icb_modpermit(struct icb_session *is)
549{
550 extern char modtab[ICB_MTABLEN][ICB_MAXNICKLEN];
551 extern int modtabcnt;
552
553 if (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
[cd7b81d]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{
[4284008]570 if (ig->mod && ig->mod != from)
[cd7b81d]571 return (-1);
572 if (!from && !to)
573 return (-1);
[1d2125a]574 if (to && !icb_modpermit(to))
575 return (-1);
[4284008]576 ig->mod = to;
[cd7b81d]577 if (to)
578 icb_status(to, STATUS_NOTIFY, "%s just passed you moderation"
579 " of %s", from ? from->nick : "server", ig->name);
580 icb_status_group(ig, to, STATUS_NOTIFY, "%s has passed moderation "
581 "to %s", from ? from->nick : "server", to ? to->nick : "server");
582 return (1);
583}
584
585/*
[4284008]586 * icb_nextfield: advances through a given buffer returning pointer to the
[a202ff1]587 * beginning of the icb field or an empty string otherwise;
588 * cleans up trailing spaces
[cd7b81d]589 */
590char *
591icb_nextfield(char **buf)
592{
593 char *start = *buf;
[a202ff1]594 char *end = NULL;
[cd7b81d]595
596 while (*buf && **buf != '\0' && **buf != ICB_M_SEP)
597 (*buf)++;
598 if (*buf && **buf == ICB_M_SEP) {
599 **buf = '\0';
[a202ff1]600 end = *buf;
[cd7b81d]601 (*buf)++;
[a202ff1]602 } else
603 end = *buf;
604 while (end && *(--end) == ' ' && end > start)
605 *end = '\0';
[cd7b81d]606 return (start);
607}
608
609/*
610 * icb_sendfmt: formats a string and sends it over
611 */
612void
613icb_sendfmt(struct icb_session *is, const char *fmt, ...)
614{
615 char buf[ICB_MSGSIZE];
616 va_list ap;
617 int buflen = 1;
618
619 va_start(ap, fmt);
620 buflen += vsnprintf(&buf[1], sizeof buf - 1, fmt, ap);
621 va_end(ap);
622 buf[0] = buflen;
623 icb_send(is, buf, buflen + 1);
624}
[626f420]625
626/*
627 * icb_vis: strnvis-like function that escapes percentages as well
628 */
629int
[b7bc432]630icb_vis(char *dst, const char *src, size_t dstsize, int flags)
[626f420]631{
632 int si = 0, di = 0, td;
633
634 while ((size_t)di < dstsize && src[si] != '\0') {
635 if (src[si] == '%')
636 dst[di++] = '%', dst[di] = '%';
[b7bc432]637 else if (src[si] == ' ' && flags & VIS_SP)
638 dst[di] = '_';
639 else if (isgraph(src[si]) || src[si] == ' ')
[626f420]640 dst[di] = src[si];
641 else {
642 td = snprintf(&dst[di], dstsize - di,
643 "\\%03o", (unsigned char)src[si]);
644 di += td - 1;
645 }
646 si++, di++;
647 }
648 dst[MIN((size_t)di, dstsize)] = '\0';
649 return (0);
650}
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