mod.c

   1 #include "mod.h"
   2
   3 #include <libxml/xmlstring.h>
   4 #include <libxml/HTMLparser.h>
   5
   6 #include <stdint.h>
   7 #include <inttypes.h>
   8 #include <sys/wait.h>
   9 #include <curl/curl.h>
  10
  11 #include <magic.h>
  12
  13 #include "entities.h"
  14
  15 static const char *nick_self;
  16 static unsigned ponify;
  17 #define elements(x) (sizeof(x)/sizeof(*x))
  18
  19 static struct tdb_context *feed_db, *chan_db, *mail_db, *seen_db;
  20
  21 static struct command_hash command_channel = { "#", NULL };
  22
  23 #define sstrncmp(a, b) (strncmp(a, b, sizeof(b)-1))
  24 #define sstrncasecmp(a, b) (strncasecmp(a, b, sizeof(b)-1))
  25
  26 #define SPAM_CUTOFF 5
  27
  28 static int pipe_command(struct bio *b, const char *target, const char *nick, int redirect_stdout, int redirect_stderr, char *argv[])
  29 {
  30         int fd[2];
  31         int lines = 0;
  32         if (pipe2(fd, O_CLOEXEC) < 0) {
  33                 privmsg(b, target, "Could not create pipe: %m");
  34                 return -1;
  35         }
  36         pid_t pid = fork();
  37         if (pid < 0) {
  38                 privmsg(b, target, "Could not fork: %m");
  39                 close(fd[0]);
  40                 close(fd[1]);
  41                 return -1;
  42         } else if (!pid) {
  43                 int fdnull = open("/dev/null", O_WRONLY|O_CLOEXEC);
  44                 close(fd[0]);
  45                 if (dup3(redirect_stdout ? fd[1] : fdnull, 1, 0) < 0)
  46                         exit(errno);
  47                 if (dup3(redirect_stderr ? fd[1] : fdnull, 2, 0) < 0)
  48                         exit(errno);
  49                 exit(execv(argv[0], argv));
  50         } else {
  51                 int loc = -1;
  52                 char buffer[0x100];
  53                 int bufptr = 0, ret;
  54                 close(fd[1]);
  55                 fcntl(fd[0], F_SETFL, O_NONBLOCK);
  56                 while ((ret = waitpid(pid, &loc, WNOHANG)) >= 0) {
  57                         while (read(fd[0], buffer+bufptr, 1) == 1) {
  58                                 if (buffer[bufptr] != '\n' && bufptr < sizeof(buffer)-1) {
  59                                         bufptr++;
  60                                         continue;
  61                                 } else if (bufptr) {
  62                                         buffer[bufptr] = 0;
  63                                         bufptr = 0;
  64                                         lines++;
  65                                         if (lines < SPAM_CUTOFF)
  66                                                 privmsg(b, nick, "%s", buffer);
  67                                         else
  68                                                 fprintf(stderr, "%s\n", buffer);
  69                                 }
  70                         }
  71
  72                         if (ret) {
  73                                 if (bufptr) {
  74                                         buffer[bufptr] = 0;
  75                                         if (lines < SPAM_CUTOFF)
  76                                                 privmsg(b, nick, "%s", buffer);
  77                                         else
  78                                                 fprintf(stderr, "%s\n", buffer);
  79                                 }
  80                                 if (lines >= SPAM_CUTOFF)
  81                                         privmsg(b, nick, "%i lines suppressed", lines - SPAM_CUTOFF + 1);
  82                                 break;
  83                         }
  84                 }
  85                 if (ret < 0)
  86                         privmsg(b, target, "error on waitpid: %m");
  87                 else
  88                         ret = loc;
  89                 close(fd[0]);
  90                 return ret;
  91         }
  92 }
  93
  94 #include "local.c"
  95
  96 static struct command_hash commands[2048];
  97
  98 static void command_abort(struct bio *b, const char *nick, const char *host, const char *target, char *args)
  99 {
 100         abort();
 101         return;
 102 }
 103
 104 static void command_crash(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 105 {
 106         *(char*)0 = 0;
 107 }
 108
 109 static void command_coinflip(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 110 {
 111         if (getrand() & 1)
 112                 action(b, target, "whirrrs and clicks excitedly at %s", nick);
 113         else
 114                 action(b, target, "eyes %s as nothing happens", nick);
 115 }
 116
 117 static void squash(char *title)
 118 {
 119         char *start = title;
 120         goto start;
 121         while (*title) {
 122                 while (*title != '\n' && *title != '\r' && *title != '\t' && *title != ' ' && *title) {
 123                         *(start++) = *(title++);
 124                 }
 125                 if (*title)
 126                         *(start++) = ' ';
 127 start:
 128                 while (*title == '\n' || *title == '\r' || *title == '\t' || *title == ' ')
 129                         title++;
 130         }
 131         *start = 0;
 132 }
 133
 134 struct curl_download_context
 135 {
 136         char *data;
 137         size_t len;
 138 };
 139
 140 static size_t write_data(void *ptr, size_t size, size_t nmemb, void *member) {
 141         struct curl_download_context *ctx = member;
 142         size *= nmemb;
 143         ctx->data = realloc(ctx->data, ctx->len + size);
 144         memcpy(ctx->data + ctx->len, ptr, size);
 145         ctx->len += size;
 146         return size;
 147 }
 148
 149 static const char *get_text(xmlNode *cur)
 150 {
 151         for (; cur; cur = cur->next) {
 152                 if (cur->type == XML_TEXT_NODE)
 153                         return cur->content;
 154         }
 155         return NULL;
 156 }
 157
 158 static const char *get_link(xmlAttr *cur, const char *which)
 159 {
 160         for (; cur; cur = cur->next) {
 161                 if (!strcasecmp(cur->name, which))
 162                         return get_text(cur->children);
 163         }
 164         return NULL;
 165 }
 166
 167 static int get_feed_entry(struct bio *b, const char *nick, const char *target, const char *category, xmlNode *entry, const char **title, const char **link)
 168 {
 169         const char *cur_title = NULL, *cur_link = NULL;
 170         xmlNode *cur;
 171         int cur_match = !category;
 172         for (cur = entry->children; cur; cur = cur->next) {
 173                 const char *name = cur->name, *cur_cat;
 174                 if (cur->type != XML_ELEMENT_NODE)
 175                         continue;
 176                 else if (!strcasecmp(name, "link")) {
 177                         const char *ishtml = get_link(cur->properties, "type");
 178                         const char *rel = get_link(cur->properties, "rel");
 179                         if ((!ishtml || !strcasecmp(ishtml, "text/html")) &&
 180                             rel && !strcasecmp(rel, "alternate"))
 181                                 cur_link = get_link(cur->properties, "href");
 182                 } else if (!strcasecmp(name, "title"))
 183                         cur_title = get_text(cur->children);
 184                 else if (!cur_match && !strcasecmp(name, "category") &&
 185                          (cur_cat = get_link(cur->properties, "term")) &&
 186                          strcasestr(cur_cat, category))
 187                         cur_match = 1;
 188         }
 189
 190         if (cur_title)
 191                 *title = cur_title;
 192         else
 193                 *title = "<no title>";
 194         *link = cur_link;
 195         return !cur_link  ? -1 : cur_match;
 196 }
 197
 198 static const char *walk_feed(struct bio *b, const char *nick, const char *target, const char *url, const char *category, xmlNode *root, const char *last_link)
 199 {
 200         const char *main_title = NULL, *main_subtitle = NULL, *main_link = NULL, *title, *link, *prev_link = NULL, *prev_title = NULL;
 201         int match, updates = 0;
 202         xmlNode *cur, *entry = NULL;
 203         for (cur = root->children; cur; cur = cur->next) {
 204                 const char *name = cur->name;
 205                 if (cur->type != XML_ELEMENT_NODE)
 206                         continue;
 207                 else if (!strcasecmp(name, "category"))
 208                         continue;
 209                 else if (!strcasecmp(name, "entry"))
 210                         entry = entry ? entry : cur;
 211                 else if (!strcasecmp(name, "title"))
 212                         main_title = get_text(cur->children);
 213                 else if (!strcasecmp(name, "subtitle"))
 214                         main_subtitle = get_text(cur->children);
 215                 else if (!strcasecmp(name, "link")) {
 216                         const char *ishtml = get_link(cur->properties, "type");
 217                         const char *rel = get_link(cur->properties, "rel");
 218                         if ((!ishtml || !strcasecmp(ishtml, "text/html")) && rel && !strcasecmp(rel, "alternate"))
 219                                 main_link = get_link(cur->properties, "href");
 220                 }
 221         }
 222         if (!main_link || !main_title) {
 223                 privmsg(b, target, "%s: Failed to parse main: %s %s", nick, main_link, main_title);
 224                 return NULL;
 225         }
 226         if (!entry)
 227                 return NULL;
 228
 229         if (!last_link)
 230                 privmsg(b, target, "adding blog %s \"%s\": %s", main_link, main_title, main_subtitle);
 231
 232         match = get_feed_entry(b, nick, target, category, entry, &title, &link);
 233         if (match < 0)
 234                 return NULL;
 235
 236         for (; !match && entry; entry = entry->next) {
 237                 if (!strcasecmp(entry->name, "entry"))
 238                         match = get_feed_entry(b, nick, target, category, entry, &title, &link);
 239         }
 240
 241         if (match < 0)
 242                 return NULL;
 243         if (!last_link) {
 244                 if (match > 0)
 245                         privmsg(b, target, "Most recent entry: %s %s", link, title);
 246                 else
 247                         privmsg(b, target, "Currently having no entries for this feed that matches the filter");
 248                 return link;
 249         }
 250         if (!strcmp(last_link, link) || !match || !entry)
 251                 return link;
 252
 253         for (entry = entry->next; entry; entry = entry->next) {
 254                 const char *cur_link, *cur_title;
 255                 if (strcasecmp(entry->name, "entry"))
 256                         continue;
 257                 match = get_feed_entry(b, nick, target, category, entry, &cur_title, &cur_link);
 258                 if (match < 0 || !strcmp(last_link, cur_link))
 259                         break;
 260                 if (match) {
 261                         prev_link = cur_link;
 262                         prev_title = cur_title;
 263                         updates++;
 264                 }
 265         }
 266         if (updates == 1)
 267                 privmsg(b, target, "( %s ): %s", prev_link, prev_title);
 268         else if (updates > 1)
 269                 privmsg(b, target, "( %s ): %u updates, linking most recent", main_link, 1+updates);
 270         privmsg(b, target, "( %s ): %s", link, title);
 271         return link;
 272 }
 273
 274 static const char *walk_rss(struct bio *b, const char *nick, const char *target, const char *url, xmlNode *root, const char *last_link)
 275 {
 276         const char *main_title = NULL, *main_link = NULL, *title = NULL, *link = NULL, *ver;
 277         xmlNode *cur, *entry = NULL;
 278         ver = get_link(root->properties, "version");
 279         if (!ver || strcmp(ver, "2.0")) {
 280                 if (!ver)
 281                         privmsg(b, target, "%s: Could not parse rss feed", nick);
 282                 else
 283                         privmsg(b, target, "%s: Invalid rss version \"%s\"", nick, ver);
 284                 return NULL;
 285         }
 286         for (cur = root->children; cur && cur->type != XML_ELEMENT_NODE; cur = cur->next);
 287         if (!cur)
 288                 return NULL;
 289         for (cur = cur->children; cur; cur = cur->next) {
 290                 const char *name = cur->name;
 291                 if (cur->type != XML_ELEMENT_NODE)
 292                         continue;
 293                 if (!strcasecmp(name, "title"))
 294                         main_title = get_text(cur->children);
 295                 else if (!strcasecmp(name, "link"))
 296                         main_link = main_link ? main_link : get_text(cur->children);
 297                 else if (!strcasecmp(name, "item"))
 298                         entry = entry ? entry : cur;
 299         }
 300         if (!main_link || !main_title) {
 301                 privmsg(b, target, "%s: Failed to parse main: %s %s", nick, main_link, main_title);
 302                 return NULL;
 303         }
 304         if (!entry)
 305                 return NULL;
 306
 307         link = title = NULL;
 308         for (cur = entry->children; cur; cur = cur->next) {
 309                 const char *name = cur->name;
 310                 if (cur->type != XML_ELEMENT_NODE)
 311                         continue;
 312                 if (!strcasecmp(name, "title"))
 313                         title = get_text(cur->children);
 314                 else if (!strcasecmp(name, "link"))
 315                         link = get_text(cur->children);
 316         }
 317         if (!title)
 318                 title = "<no title>";
 319         if (!link) {
 320                 privmsg(b, target, "%s: Failed to parse entry: %s %s", nick, link, title);
 321                 return NULL;
 322         }
 323         if (!last_link) {
 324                 privmsg(b, target, "adding blog %s \"%s\"", main_link, main_title);
 325                 privmsg(b, target, "Most recent entry: %s %s", link, title);
 326         } else if (strcmp(last_link, link)) {
 327                 int updates = 0;
 328                 const char *prev_title = NULL, *prev_link = NULL, *cur_title = NULL, *cur_link = NULL;
 329                 for (entry = entry->next; entry; entry = entry->next) {
 330                         if (strcasecmp(entry->name, "item"))
 331                                 continue;
 332                         prev_title = cur_title;
 333                         prev_link = cur_link;
 334                         cur_title = cur_link = NULL;
 335                         for (cur = entry->children; cur; cur = cur->next) {
 336                                 const char *name = cur->name;
 337                                 if (cur->type != XML_ELEMENT_NODE)
 338                                         continue;
 339                                 if (!strcasecmp(name, "title"))
 340                                         cur_title = get_text(cur->children);
 341                                 else if (!strcasecmp(name, "link"))
 342                                         cur_link = get_text(cur->children);
 343                         }
 344                         if (!cur_title)
 345                                 cur_title = "<no title>";
 346                         if (!cur_link || !strcmp(last_link, cur_link))
 347                                 break;
 348                         updates++;
 349                 }
 350                 if (updates == 1)
 351                         privmsg(b, target, "( %s ): %s", prev_link, prev_title);
 352                 else if (updates > 1)
 353                         privmsg(b, target, "( %s ): %u updates, linking most recent", main_link, 1+updates);
 354                 privmsg(b, target, "( %s ): %s", link, title);
 355         }
 356         return link;
 357 }
 358
 359 // HTML is a mess, so I'm just walking the tree depth first until I find the next element..
 360 static xmlNode *next_link(xmlNode *cur_node)
 361 {
 362         if (cur_node->children)
 363                 return cur_node->children;
 364         while (cur_node) {
 365                 if (cur_node->next)
 366                         return cur_node->next;
 367                 cur_node = cur_node->parent;
 368         }
 369         return NULL;
 370 }
 371
 372 static const char *get_atom_link(xmlNode *cur)
 373 {
 374         for (; cur; cur = next_link(cur)) {
 375                 if (cur->type != XML_ELEMENT_NODE)
 376                         continue;
 377                 if (!strcasecmp(cur->name, "link")) {
 378                         const char *isxml = get_link(cur->properties, "type");
 379                         if (isxml && !strcasecmp(isxml, "application/atom+xml"))
 380                                 return get_link(cur->properties, "href");
 381                 }
 382         }
 383         return NULL;
 384 }
 385
 386 static const char *get_rss_link(xmlNode *cur)
 387 {
 388         for (; cur; cur = next_link(cur)) {
 389                 if (cur->type != XML_ELEMENT_NODE)
 390                         continue;
 391                 if (!strcasecmp(cur->name, "link")) {
 392                         const char *isxml = get_link(cur->properties, "type");
 393                         if (isxml && !strcasecmp(isxml, "application/rss+xml"))
 394                                 return get_link(cur->properties, "href");
 395                 }
 396         }
 397         return NULL;
 398 }
 399
 400 static void do_html(struct bio *b, const char *nick, const char *target, const char *url, const char *data, unsigned len)
 401 {
 402         htmlDocPtr ctx = htmlReadMemory(data, len, 0, url, HTML_PARSE_RECOVER|HTML_PARSE_NOERROR|HTML_PARSE_NOWARNING);
 403         xmlNode *root = xmlDocGetRootElement(ctx);
 404         const char *link = get_atom_link(root);
 405         if (link)
 406                 privmsg(b, target, "%s: not a valid feed link, try atom: %s", nick, link);
 407         else if ((link = get_rss_link(root)))
 408                 privmsg(b, target, "%s: not a valid feed link, try rss: %s", nick, link);
 409         else
 410                 privmsg(b, target, "%s: not a valid feed link, no suggestion found", nick);
 411         xmlFreeDoc(ctx);
 412 }
 413
 414 static size_t get_time_from_header(void *data, size_t size, size_t size2, void *ptr)
 415 {
 416         char *d, *e;
 417         size *= size2;
 418         if (sstrncmp(data, "Last-Modified: "))
 419                 return size;
 420         data += sizeof("Last-Modified: ")-1;
 421         *(char**)ptr = d = strdup(data);
 422         if ((e = strchr(d, '\r')))
 423                 *e = 0;
 424         return size;
 425 }
 426
 427 static int check_single_feed(struct bio *b, const char *target, TDB_DATA key, const char *last_modified, const char *url, const char *link, const char *nick)
 428 {
 429         struct curl_download_context curl_ctx = {};
 430         struct curl_slist *headers = NULL;
 431         char error[CURL_ERROR_SIZE], *category = strchr(url, '#');
 432         int retval = -1;
 433         headers = curl_slist_append(headers, "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1");
 434         headers = curl_slist_append(headers, "Accept: */*");
 435         if (category)
 436                 *(category++) = 0;
 437
 438         CURL *h = curl_easy_init();
 439         curl_easy_setopt(h, CURLOPT_HTTPHEADER, headers);
 440         curl_easy_setopt(h, CURLOPT_URL, url);
 441         curl_easy_setopt(h, CURLOPT_WRITEFUNCTION, write_data);
 442         curl_easy_setopt(h, CURLOPT_WRITEDATA, &curl_ctx);
 443         curl_easy_setopt(h, CURLOPT_ERRORBUFFER, error);
 444         curl_easy_setopt(h, CURLOPT_FOLLOWLOCATION, 1);
 445         curl_easy_setopt(h, CURLOPT_MAXREDIRS, 3);
 446         curl_easy_setopt(h, CURLOPT_SSL_VERIFYPEER, 0);
 447         curl_easy_setopt(h, CURLOPT_TIMEOUT, 8);
 448         curl_easy_setopt(h, CURLOPT_FILETIME, 1);
 449         curl_easy_setopt(h, CURLOPT_HEADERFUNCTION, get_time_from_header);
 450         curl_easy_setopt(h, CURLOPT_WRITEHEADER, &last_modified);
 451         //curl_easy_setopt(h, CURLOPT_VERBOSE, 1);
 452
 453         if (last_modified) {
 454                 char *tmp;
 455                 asprintf(&tmp, "If-Modified-Since: %s", last_modified);
 456                 headers = curl_slist_append(headers, tmp);
 457                 free(tmp);
 458         }
 459
 460         int success = curl_easy_perform(h);
 461         curl_slist_free_all(headers);
 462         alarm(ALARM_TIME);
 463         if (success == CURLE_OK) {
 464                 char *mime = NULL;
 465                 long code;
 466                 curl_easy_getinfo(h, CURLINFO_CONTENT_TYPE, &mime);
 467                 curl_easy_getinfo(h, CURLINFO_RESPONSE_CODE, &code);
 468                 if (code == 304)
 469                         { }
 470                 else if (!mime || !sstrncmp(mime, "application/xml") || !sstrncmp(mime, "text/xml")) {
 471                         const char *ret_link = NULL;
 472                         xmlDocPtr ctx = xmlReadMemory(curl_ctx.data, curl_ctx.len, 0, url, XML_PARSE_NOWARNING | XML_PARSE_NOERROR);
 473                         xmlNode *root = xmlDocGetRootElement(ctx);
 474
 475                         if (!strcasecmp(root->name, "feed"))
 476                                 ret_link = walk_feed(b, nick, target, url, category, root, link);
 477                         else if (!strcasecmp(root->name, "rss"))
 478                                 ret_link = walk_rss(b, nick, target, url, root, link);
 479                         else {
 480                                 privmsg(b, target, "Unknown feed type \"%s\"", root->name);
 481                                 goto free_ctx;
 482                         }
 483                         if (category)
 484                                 category[-1] = '#';
 485
 486                         if (!ret_link)
 487                                 privmsg(b, target, "Could not feed parse correctly");
 488                         else if (ret_link && (!link || strcmp(ret_link, link))) {
 489                                 TDB_DATA val;
 490                                 asprintf((char**)&val.dptr, "%s\001%s", last_modified ? last_modified : "", ret_link);
 491                                 val.dsize = strlen(val.dptr)+1;
 492                                 if (tdb_store(feed_db, key, val, 0) < 0)
 493                                         privmsg(b, target, "updating returns %s", tdb_errorstr(feed_db));
 494                                 free(val.dptr);
 495                                 retval = 1;
 496                         }
 497                         else
 498                                 retval = 0;
 499
 500 free_ctx:
 501                         xmlFreeDoc(ctx);
 502                 } else if (link)
 503                         {}
 504                 else if (!sstrncmp(mime, "text/html") || !sstrncmp(mime, "application/xhtml+xml"))
 505                         do_html(b, nick, target, url, curl_ctx.data, curl_ctx.len);
 506                 else
 507                         privmsg(b, target, "unhandled content type %s", mime);
 508         } else if (!link)
 509                 privmsg(b, target, "Error %s (%u)\n", error, success);
 510
 511         free(curl_ctx.data);
 512         curl_easy_cleanup(h);
 513         return retval;
 514 }
 515
 516 static void command_follow(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 517 {
 518         char *space, *last_link = NULL;
 519         TDB_DATA key, val;
 520         int ret;
 521         if (!feed_db)
 522                 return;
 523         if (target[0] != '#') {
 524                 privmsg(b, target, "%s: Can only follow on channels", nick);
 525                 return;
 526         }
 527         if (!args || !*args) {
 528                 privmsg(b, target, "%s: Usage: !follow <url>", nick);
 529                 return;
 530         }
 531
 532         if (((space = strchr(args, ' ')) && space < strchr(args, '#')) ||
 533             (sstrncmp(args, "http://") && sstrncmp(args, "https://"))) {
 534                 privmsg(b, target, "%s: Invalid url", nick);
 535                 return;
 536         }
 537
 538         alarm(0);
 539         key.dsize = asprintf((char**)&key.dptr, "%s,%s", target, args)+1;
 540         val = tdb_fetch(feed_db, key);
 541         if (val.dptr)
 542                 last_link = strchr(val.dptr, '\001');
 543         ret = check_single_feed(b, target, key, NULL, args, last_link ? last_link+1 : NULL, nick);
 544         free(val.dptr);
 545         if (!ret)
 546                 privmsg(b, target, "%s: Not updated", nick);
 547         free(key.dptr);
 548 }
 549
 550 static void channel_feed_check(struct bio *b, const char *target, int64_t now)
 551 {
 552         int len = strlen(target);
 553         TDB_DATA chan, res;
 554         if (!feed_db || !chan_db)
 555                 return;
 556         chan.dptr = (char*)target;
 557         chan.dsize = len+1;
 558         res = tdb_fetch(chan_db, chan);
 559         if (res.dptr && res.dsize == 8) {
 560                 uint64_t then = *(uint64_t*)res.dptr;
 561                 if (now - then <= 2000)
 562                         return;
 563         }
 564         alarm(0);
 565         free(res.dptr);
 566         res.dptr = (unsigned char*)&now;
 567         res.dsize = 8;
 568         if (tdb_store(chan_db, chan, res, 0) < 0) {
 569                 static int complain_db;
 570                 if (!complain_db++)
 571                         privmsg(b, target, "updating database: %s", tdb_errorstr(feed_db));
 572                 goto out;
 573         }
 574
 575         /* Reset the alarm on every get, we are not actually in danger of doing an infinite loop, probably */
 576         for (TDB_DATA d = tdb_firstkey(feed_db); d.dptr;) {
 577                 TDB_DATA f = tdb_fetch(feed_db, d);
 578                 TDB_DATA next = tdb_nextkey(feed_db, d);
 579
 580                 if (!strncmp(d.dptr, target, len) && d.dptr[len] == ',') {
 581                         const char *url = (char*)d.dptr + len + 1;
 582                         char *sep;
 583                         if ((sep = strchr(f.dptr, '\001'))) {
 584                                 *(sep++) = 0;
 585                                 check_single_feed(b, target, d, f.dptr, url, sep, target);
 586                                 alarm(0);
 587                         }
 588                 }
 589                 free(d.dptr);
 590                 free(f.dptr);
 591                 d = next;
 592         }
 593 out:
 594         alarm(ALARM_TIME);
 595 }
 596
 597 static void command_unfollow(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 598 {
 599         TDB_DATA key;
 600         char *url;
 601
 602         if (!feed_db)
 603                 return;
 604
 605         if (!(url = token(&args, ' ')) || (sstrncmp(url, "http://") && sstrncmp(url, "https://"))) {
 606                 privmsg(b, target, "%s: Invalid url", nick);
 607                 return;
 608         }
 609         if (target[0] != '#') {
 610                 privmsg(b, target, "%s: Can only unfollow on channels", nick);
 611                 return;
 612         }
 613         key.dsize = asprintf((char**)&key.dptr, "%s,%s", target, url)+1;
 614         if (tdb_delete(feed_db, key) < 0) {
 615                 if (tdb_error(feed_db) == TDB_ERR_NOEXIST)
 616                         privmsg(b, target, "%s: Not following %s on this channel", nick, url);
 617                 else
 618                         privmsg(b, target, "%s: Could not delete: %s", nick, tdb_errorstr(feed_db));
 619         } else
 620                 privmsg(b, target, "%s: No longer following %s", nick, url);
 621         free(key.dptr);
 622 }
 623
 624 static void command_feeds(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 625 {
 626         int len = strlen(target), found = 0;
 627         if (!feed_db)
 628                 return;
 629         if (target[0] != '#') {
 630                 privmsg(b, target, "%s: Only useful in channels..", nick);
 631                 return;
 632         }
 633         for (TDB_DATA d = tdb_firstkey(feed_db); d.dptr;) {
 634                 TDB_DATA f = tdb_fetch(feed_db, d);
 635                 TDB_DATA next = tdb_nextkey(feed_db, d);
 636
 637                 if (!strncmp(d.dptr, target, len) && d.dptr[len] == ',') {
 638                         privmsg(b, target, "%s: following %s", nick, d.dptr + len + 1);
 639                         found++;
 640                 }
 641                 free(d.dptr);
 642                 free(f.dptr);
 643                 d = next;
 644         }
 645         if (!found)
 646                 privmsg(b, target, "%s: not following any feed on %s", nick, target);
 647 }
 648
 649 static void command_feed_get(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 650 {
 651         if (!feed_db)
 652                 return;
 653         for (TDB_DATA d = tdb_firstkey(feed_db); d.dptr;) {
 654                 TDB_DATA next = tdb_nextkey(feed_db, d);
 655                 if (!args || strcasestr(d.dptr, args)) {
 656                         TDB_DATA f = tdb_fetch(feed_db, d);
 657                         privmsg(b, target, "%s: %s = %s", nick, d.dptr, f.dptr);
 658                         free(f.dptr);
 659                 }
 660                 if (strlen(d.dptr)+1 < d.dsize) {
 661                         privmsg(b, target, "%s: removed buggy entry", nick);
 662                         tdb_delete(feed_db, d);
 663                 }
 664                 free(d.dptr);
 665                 d = next;
 666         }
 667 }
 668
 669 static void command_feed_set(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 670 {
 671         if (!feed_db)
 672                 return;
 673         TDB_DATA key, val;
 674         key.dptr = token(&args, ' ');
 675         char *value = token(&args, ' ');
 676         if (!key.dptr || !value)
 677                 return;
 678         key.dsize = strlen(key.dptr) + 1;
 679         val.dsize = strlen(value) + 2;
 680         val.dptr = malloc(val.dsize);
 681         strcpy(val.dptr+1, value);
 682         val.dptr[0] = '\001';
 683         if (tdb_store(feed_db, key, val, 0) < 0)
 684                 privmsg(b, target, "%s: setting failed: %s", nick, tdb_errorstr(feed_db));
 685         else
 686                 privmsg(b, target, "%s: burp", nick);
 687         free(val.dptr);
 688 }
 689
 690 static void command_feed_rem(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 691 {
 692         if (!feed_db || !args)
 693                 return;
 694         TDB_DATA key = { .dptr = (unsigned char*)args, .dsize = strlen(args)+1 };
 695         if (tdb_delete(feed_db, key) < 0)
 696                 privmsg(b, target, "%s: removing failed: %s", nick, tdb_errorstr(feed_db));
 697         else
 698                 privmsg(b, target, "%s: burp", nick);
 699 }
 700
 701 static void command_feed_xxx(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 702 {
 703         if (!feed_db)
 704                 return;
 705
 706         tdb_wipe_all(feed_db);
 707         privmsg(b, target, "%s: all evidence erased", nick);
 708 }
 709
 710 static void command_seen_xxx(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 711 {
 712         if (!seen_db)
 713                 return;
 714
 715         tdb_wipe_all(seen_db);
 716         privmsg(b, target, "%s: all evidence erased", nick);
 717 }
 718
 719 static void command_feed_counter(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 720 {
 721         if (!chan_db)
 722                 return;
 723         tdb_wipe_all(chan_db);
 724         privmsg(b, target, "%s: All update counters reset", nick);
 725 }
 726
 727 static char *get_text_appended(xmlNode *cur)
 728 {
 729         for (; cur; cur = cur->next) {
 730                 if (cur->type != XML_TEXT_NODE)
 731                         continue;
 732                 return strdup(cur->content);
 733         }
 734         return NULL;
 735 }
 736
 737 static char *get_title(struct bio *b, xmlNode *cur_node)
 738 {
 739         for (; cur_node; cur_node = next_link(cur_node)) {
 740                 if (cur_node->type == XML_ELEMENT_NODE && !strcasecmp(cur_node->name, "title")) {
 741                         if (!cur_node->children)
 742                                 return NULL;
 743                         return get_text_appended(cur_node->children);
 744                 }
 745         }
 746         return NULL;
 747 }
 748
 749 static void internal_link(struct bio *b, const char *nick, const char *host, const char *target, char *args, unsigned verbose)
 750 {
 751         CURL *h;
 752         struct curl_slist *headers = NULL;
 753         char error[CURL_ERROR_SIZE];
 754         int success;
 755         struct curl_download_context curl_ctx = {};
 756
 757         if (!args)
 758                 return;
 759
 760         alarm(0);
 761         h = curl_easy_init();
 762         headers = curl_slist_append(headers, "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1");
 763         headers = curl_slist_append(headers, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
 764         headers = curl_slist_append(headers, "Accept-Language: en-us,en;q=0.7");
 765         headers = curl_slist_append(headers, "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7");
 766         headers = curl_slist_append(headers, "DNT: 1");
 767         headers = curl_slist_append(headers, "Connection: keep-alive");
 768         curl_easy_setopt(h, CURLOPT_HTTPHEADER, headers);
 769         curl_easy_setopt(h, CURLOPT_URL, args);
 770         curl_easy_setopt(h, CURLOPT_WRITEFUNCTION, write_data);
 771         curl_easy_setopt(h, CURLOPT_WRITEDATA, &curl_ctx);
 772         curl_easy_setopt(h, CURLOPT_ERRORBUFFER, error);
 773         curl_easy_setopt(h, CURLOPT_FOLLOWLOCATION, 1);
 774         curl_easy_setopt(h, CURLOPT_MAXREDIRS, 20);
 775         curl_easy_setopt(h, CURLOPT_SSL_VERIFYPEER, 0);
 776         curl_easy_setopt(h, CURLOPT_TIMEOUT, 8);
 777         //curl_easy_setopt(h, CURLOPT_VERBOSE, 1);
 778         success = curl_easy_perform(h);
 779         curl_easy_cleanup(h);
 780         curl_slist_free_all(headers);
 781         alarm(ALARM_TIME);
 782         if (success == CURLE_OK) {
 783                 magic_t m = magic_open(MAGIC_MIME_TYPE);
 784                 magic_load(m, NULL);
 785                 const char *mime = magic_buffer(m, curl_ctx.data, curl_ctx.len);
 786                 if (strstr(mime, "text/html") || strstr(mime, "application/xml") || strstr(mime, "application/xhtml+xml")) {
 787                         htmlDocPtr ctx = htmlReadMemory(curl_ctx.data, curl_ctx.len, 0, args, HTML_PARSE_RECOVER|HTML_PARSE_NOERROR|HTML_PARSE_NOWARNING);
 788                         xmlNode *root_element = xmlDocGetRootElement(ctx);
 789                         char *title = get_title(b, root_element);
 790                         if (title) {
 791                                 char *nuke;
 792                                 squash(title);
 793                                 decode_html_entities_utf8(title, NULL);
 794                                 if ((nuke = strstr(title, " on SoundCloud - Create")))
 795                                         *nuke = 0;
 796                                 if (*title)
 797                                         privmsg(b, target, "%s linked %s", nick, title);
 798                                 free(title);
 799                         }
 800                         if (verbose && !title)
 801                                 privmsg(b, target, "%s linked %s page with invalid title", nick, mime);
 802                         xmlFreeDoc(ctx);
 803                 } else if (verbose) {
 804                         magic_setflags(m, MAGIC_COMPRESS);
 805                         const char *desc = magic_buffer(m, curl_ctx.data, curl_ctx.len);
 806                         privmsg(b, target, "%s linked type %s", nick, desc);
 807                 }
 808                 magic_close(m);
 809         }
 810         if (verbose && success != CURLE_OK)
 811                 privmsg(b, target, "Error %s (%u)\n", error, success);
 812         free(curl_ctx.data);
 813 }
 814
 815 static void command_get(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 816 {
 817         if (!args || (sstrncmp(args, "http://") && sstrncmp(args, "https://")))
 818                 return;
 819         internal_link(b, nick, host, target, token(&args, ' '), 1);
 820 }
 821
 822 static void command_hug(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 823 {
 824         action(b, target, "gives a robotic hug to %s", args ? args : nick);
 825 }
 826
 827 static void command_hugs(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 828 {
 829         action(b, target, "gives a lunar hug to %s", args ? args : nick);
 830 }
 831
 832 static void command_derpy(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 833 {
 834         static const char *insults[] = {
 835                 "accidentally shocks herself",
 836                 "tumbles down the stairs like a slinky",
 837                 "whirrrs and clicks in a screeching way",
 838                 "had problems executing this command",
 839                 "breaks down entirely",
 840                 "uses her magic to levitate herself off the ground, then hits it face first"
 841         };
 842         action(b, target, "%s", insults[getrand() % elements(insults)]);
 843 }
 844
 845 static void command_inspect(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 846 {
 847         struct command_hash *c;
 848         unsigned leave, crash;
 849         char *cmd;
 850         if (!args || !(cmd = token(&args, ' ')))
 851                 return;
 852
 853         if (strcmp(cmd, "#")) {
 854                 c = &commands[strhash(cmd) % elements(commands)];
 855                 if (!c->string || strcasecmp(c->string, cmd)) {
 856                         privmsg(b, target, "Command %s not valid", cmd);
 857                         return;
 858                 }
 859         } else
 860                 c = &command_channel;
 861
 862         leave = c->left + (c->cmd == command_inspect);
 863         crash = c->enter - leave;
 864         if (c->enter != leave)
 865                 privmsg(b, target, "%s: %u successes and %u crash%s, last crashing command: %s", c->string, leave, crash, crash == 1 ? "" : "es", c->failed_command);
 866         else
 867                 privmsg(b, target, "%s: %u time%s executed succesfully", c->string, leave, leave == 1 ? "" : "s");
 868 }
 869
 870 static void command_rebuild(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 871 {
 872         int ret;
 873         char *make[] = { "/usr/bin/make", "-j4", NULL };
 874         char *git_reset[] = { "/usr/bin/git", "reset", "--hard", "master", NULL };
 875         ret = pipe_command(b, target, nick, 0, 1, git_reset);
 876         if (ret) {
 877                 action(b, target, "could not rebuild");
 878                 return;
 879         }
 880         alarm(2*ALARM_TIME); // sigh, swapping to death
 881         ret = pipe_command(b, target, nick, 0, 1, make);
 882         if (!ret)
 883                 kill(getpid(), SIGUSR1);
 884         else if (ret > 0)
 885                 action(b, target, "displays an ominous %i", ret);
 886 }
 887
 888 static void command_swear(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 889 {
 890         static const char *insults[] = {
 891                 "featherbrain",
 892                 "ponyfeathers",
 893                 "What in the hey?",
 894                 "What are you, a dictionary?",
 895                 "TAR-DY!",
 896                 "[BUY SOME APPLES]",
 897                 "{ Your lack of bloodlust on the battlefield is proof positive that you are a soulless automaton! }",
 898                 "Your royal snootiness"
 899         };
 900         privmsg(b, target, "%s: %s", args ? args : nick, insults[getrand() % elements(insults)]);
 901 }
 902
 903 static const char *perty(int64_t *t)
 904 {
 905         if (*t >= 14 * 24 * 3600) {
 906                 *t /= 7 * 24 * 3600;
 907                 return "weeks";
 908         } else if (*t >= 48 * 3600) {
 909                 *t /= 24 * 3600;
 910                 return "days";
 911         } else if (*t >= 7200) {
 912                 *t /= 3600;
 913                 return "hours";
 914         } else if (*t >= 120) {
 915                 *t /= 60;
 916                 return "minutes";
 917         }
 918         return *t == 1 ? "second" : "seconds";
 919 }
 920
 921 static void command_timeout(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 922 {
 923         struct command_hash *c;
 924         int64_t t = get_time(b, target);
 925         int64_t howlong;
 926         if (t < 0)
 927                 return;
 928         char *arg = token(&args, ' ');
 929         if (!arg || !args || !(howlong = atoi(args))) {
 930                 action(b, target, "pretends to time out");;
 931                 return;
 932         }
 933         c = &commands[strhash(arg) % elements(commands)];
 934         if (c->string && !strcasecmp(c->string, arg)) {
 935                 c->disabled_until = t + howlong;
 936                 const char *str = perty(&howlong);
 937                 action(b, target, "disables %s for %"PRIi64" %s", arg, howlong, str);
 938         } else
 939                 action(b, target, "clicks sadly at %s for not being able to find that command", nick);
 940 }
 941
 942 static void command_mfw(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 943 {
 944         char error[CURL_ERROR_SIZE], *new_url;
 945         CURL *h = curl_easy_init();
 946         struct curl_slist *headers = NULL;
 947         struct curl_download_context curl_ctx = {};
 948         headers = curl_slist_append(headers, "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1");
 949         headers = curl_slist_append(headers, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
 950         headers = curl_slist_append(headers, "Accept-Language: en-us,en;q=0.7");
 951         headers = curl_slist_append(headers, "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7");
 952         headers = curl_slist_append(headers, "DNT: 1");
 953         headers = curl_slist_append(headers, "Connection: keep-alive");
 954         curl_easy_setopt(h, CURLOPT_HTTPHEADER, headers);
 955         curl_easy_setopt(h, CURLOPT_URL, "http://mylittlefacewhen.com/random/");
 956         curl_easy_setopt(h, CURLOPT_WRITEFUNCTION, write_data);
 957         curl_easy_setopt(h, CURLOPT_WRITEDATA, &curl_ctx);
 958         curl_easy_setopt(h, CURLOPT_ERRORBUFFER, error);
 959         curl_easy_setopt(h, CURLOPT_TIMEOUT, 8);
 960         //curl_easy_setopt(h, CURLOPT_VERBOSE, 1);
 961         alarm(ALARM_TIME);
 962         CURLcode ret = curl_easy_perform(h);
 963         if (ret == CURLE_OK && curl_easy_getinfo(h, CURLINFO_REDIRECT_URL, &new_url) == CURLE_OK)
 964                 privmsg(b, target, "%s: %s", nick, new_url);
 965         curl_slist_free_all(headers);
 966         curl_easy_cleanup(h);
 967         if (ret != CURLE_OK)
 968                 privmsg(b, target, "%s: You have no face", nick);
 969 }
 970
 971 static TDB_DATA get_mail_key(const char *nick)
 972 {
 973         TDB_DATA d;
 974         int i;
 975         d.dsize = strlen(nick)+1;
 976         d.dptr = malloc(d.dsize);
 977         for (i = 0; i < d.dsize - 1; ++i)
 978                 d.dptr[i] = tolower(nick[i]);
 979         d.dptr[i] = 0;
 980         return d;
 981 }
 982
 983 static void command_mail(struct bio *b, const char *nick, const char *host, const char *target, char *args)
 984 {
 985         char *victim, *x;
 986         size_t len;
 987         if (!mail_db || !seen_db)
 988                 return;
 989         TDB_DATA key, val;
 990         victim = token(&args, ' ');
 991         if (!victim || !args || victim[0] == '#' || strchr(victim, '@') || strchr(victim, '.')) {
 992                 privmsg(b, target, "%s: Usage: !mail <nick> <message>", nick);
 993                 return;
 994         }
 995         if (!strcasecmp(victim, nick_self)) {
 996                 action(b, target, "whirrs and clicks excitedly at the mail she received from %s", nick);
 997                 return;
 998         }
 999         if (!strcasecmp(victim, nick)) {
1000                 action(b, target, "echos the words from %s back to them: %s", nick, args);
1001                 return;
1002         }
1003
1004         key = get_mail_key(victim);
1005
1006         val = tdb_fetch(seen_db, key);
1007         if (val.dptr && (x = strchr(val.dptr, ','))) {
1008                 int64_t now = get_time(b, NULL);
1009                 *(x++) = 0;
1010                 if (now >= 0 && (now - atoll(val.dptr)) < 300 && (!sstrncasecmp(x, "in ") || !sstrncasecmp(x, "joining "))) {
1011                         action(b, target, "would rather not store mail for someone active so recently");
1012                         goto out;
1013                 }
1014         }
1015
1016         val = tdb_fetch(mail_db, key);
1017         if (!val.dptr)
1018                 val.dsize = 0;
1019         else {
1020                 unsigned char *cur;
1021                 int letters = 0;
1022                 for (cur = val.dptr; cur < val.dptr + val.dsize; cur += strlen(cur)+1)
1023                         letters++;
1024                 if (letters >= 4) {
1025                         action(b, target, "looks sadly at %s as she cannot hold any more mail to %s", nick, victim);
1026                         goto out;
1027                 }
1028         }
1029         len = strlen(nick) + strlen(args)+3;
1030         val.dptr = realloc(val.dptr, val.dsize + len);
1031         sprintf(val.dptr + val.dsize, "%s: %s", nick, args);
1032         val.dsize += len;
1033         if (tdb_store(mail_db, key, val, 0) < 0)
1034                 privmsg(b, target, "%s: updating mail returns %s", nick, tdb_errorstr(mail_db));
1035         else
1036                 action(b, target, "whirrs and clicks at %s as she stores the mail for %s", nick, victim);
1037 out:
1038         free(val.dptr);
1039         free(key.dptr);
1040 }
1041
1042 static void command_deliver(struct bio *b, const char *nick, const char *target)
1043 {
1044         TDB_DATA key, val;
1045         unsigned char *cur;
1046         if (!mail_db)
1047                 return;
1048         key = get_mail_key(nick);
1049         val = tdb_fetch(mail_db, key);
1050         if (!val.dptr) {
1051                 free(key.dptr);
1052                 return;
1053         }
1054         if (strcasecmp(key.dptr, nick_self)) {
1055                 privmsg(b, target, "%s: You've got mail!", nick);
1056                 for (cur = val.dptr; cur < val.dptr + val.dsize; cur += strlen(cur)+1)
1057                         privmsg(b, target, "From %s", cur);
1058         }
1059         free(val.dptr);
1060         tdb_delete(mail_db, key);
1061         free(key.dptr);
1062 }
1063
1064 static void update_seen(struct bio *b, char *doingwhat, const char *nick)
1065 {
1066         TDB_DATA key;
1067         alarm(ALARM_TIME);
1068         key = get_mail_key(nick);
1069         TDB_DATA val = { .dptr = doingwhat, .dsize = strlen(doingwhat)+1 };
1070         if (seen_db)
1071                 tdb_store(seen_db, key, val, 0);
1072         free(key.dptr);
1073 }
1074
1075 static void command_seen(struct bio *b, const char *nick, const char *host, const char *target, char *args)
1076 {
1077         char *arg = token(&args, ' '), *x;
1078         int64_t now = get_time(b, target);
1079         TDB_DATA key, val;
1080         if (now < 0)
1081                 return;
1082         if (!seen_db || !arg) {
1083                 privmsg(b, target, "%s: { Error... }", nick);
1084                 return;
1085         }
1086         if (!strcasecmp(arg, nick_self)) {
1087                 action(b, target, "whirrs and clicks at %s", nick);
1088                 return;
1089         }
1090         key = get_mail_key(arg);
1091         val = tdb_fetch(seen_db, key);
1092         if (val.dptr && (x = strchr(val.dptr, ','))) {
1093                 int64_t delta;
1094                 const char *str;
1095                 *(x++) = 0;
1096                 delta = now - atoll(val.dptr);
1097                 str = perty(&delta);
1098                 if (delta < 0)
1099                         privmsg(b, target, "%s was last seen in the future %s", arg, x);
1100                 else
1101                         privmsg(b, target, "%s was last seen %"PRIi64" %s ago %s", arg, delta, str, x);
1102         } else
1103                 action(b, target, "cannot find any evidence that %s exists", arg);
1104 }
1105
1106 static void command_mailbag(struct bio *b, const char *nick, const char *host, const char *target, char *args)
1107 {
1108         char buffer[256];
1109         unsigned rem = sizeof(buffer)-1, first = 2;
1110         if (!mail_db)
1111                 return;
1112         buffer[rem] = 0;
1113
1114         for (TDB_DATA f = tdb_firstkey(mail_db); f.dptr;) {
1115                 if (f.dsize + 4 > rem) {
1116                         privmsg(b, target, "%s: Holding mail for: %s", nick, &buffer[rem]);
1117                         first = 2;
1118                         rem = sizeof(buffer)-1;
1119                         assert(f.dsize + 4 < rem);
1120                 }
1121                 if (f.dptr) {
1122                         if (first == 2) {
1123                                 first = 1;
1124                         } else if (first) {
1125                                 rem -= 5;
1126                                 memcpy(&buffer[rem], " and ", 5);
1127                                 first = 0;
1128                         } else {
1129                                 rem -= 2;
1130                                 memcpy(&buffer[rem], ", ", 2);
1131                         }
1132                         rem -= f.dsize - 1;
1133                         memcpy(&buffer[rem], f.dptr, f.dsize - 1);
1134                 }
1135                 TDB_DATA next = tdb_nextkey(mail_db, f);
1136                 free(f.dptr);
1137                 f = next;
1138         }
1139         if (first < 2)
1140                 privmsg(b, target, "%s: Holding mail for: %s", nick, &buffer[rem]);
1141 }
1142
1143 static void command_no_deliver(struct bio *b, const char *nick, const char *host, const char *target, char *args)
1144 {
1145         TDB_DATA key, val;
1146         char *cur;
1147         if (!mail_db || !(cur = token(&args, ' ')))
1148                 return;
1149         key = get_mail_key(cur);
1150         val = tdb_fetch(mail_db, key);
1151         if (!val.dptr)
1152                 action(b, target, "ponyshrugs as no mail for %s was found", cur);
1153         else {
1154                 action(b, target, "deletes all evidence of %s's mail", cur);
1155                 tdb_delete(mail_db, key);
1156         }
1157         free(val.dptr);
1158         free(key.dptr);
1159 }
1160
1161 static void channel_msg(struct bio *b, const char *nick, const char *host,
1162                         const char *chan, const char *msg, int64_t t)
1163 {
1164         char *cur = NULL, *next;
1165         int is_action = 0;
1166
1167         if (!msg || !strcmp(nick, "`Celestia`") || !strcmp(nick, "derpy") || !strcmp(nick, "`Luna`") || !sstrncmp(nick, "GitHub") || !sstrncmp(nick, "CIA-") || !strcmp(nick, "Terminus-Bot") || !strcmp(nick, "r0m"))
1168                 return;
1169
1170         if (!sstrncasecmp(msg, "\001ACTION ")) {
1171                 msg += sizeof("\001ACTION ")-1;
1172                 is_action = 1;
1173                 asprintf(&cur, "%"PRIi64 ",in %s: * %s %s", t, chan, nick, msg);
1174         } else
1175                 asprintf(&cur, "%"PRIi64 ",in %s: <%s> %s", t, chan, nick, msg);
1176         if (t > 0)
1177                 update_seen(b, cur, nick);
1178         alarm(ALARM_TIME);
1179         free(cur);
1180         (void)is_action;
1181
1182         next = (char*)msg;
1183         while (next && (cur = token(&next, ' '))) {
1184                 if (!strcasecmp(cur, ">mfw") || !strcasecmp(cur, "mfw")) {
1185                         if (!strcasecmp(chan, "#brony") || !ponify)
1186                                 continue;
1187                         if (t < 0 || t > commands[strhash("mfw") % elements(commands)].disabled_until)
1188                                 command_mfw(b, nick, host, chan, NULL);
1189                         break;
1190                 } else if (!sstrncasecmp(cur, "http://") || !sstrncasecmp(cur, "https://")) {
1191                         static char last_url[512];
1192                         char *part;
1193                         if (!strcmp(cur, last_url))
1194                                 return;
1195                         strncpy(last_url, cur, sizeof(last_url)-1);
1196
1197                         if (t >= 0 && t < commands[strhash("get") % elements(commands)].disabled_until)
1198                                 return;
1199
1200                         else if (strcasestr(cur, "youtube.com/user") && (part = strstr(cur, "#p/"))) {
1201                                 char *foo;
1202                                 part = strrchr(part, '/') + 1;
1203                                 asprintf(&foo, "http://youtube.com/watch?v=%s", part);
1204                                 if (foo)
1205                                         internal_link(b, nick, host, chan, foo, 0);
1206                                 free(foo);
1207                                 return;
1208                         } else if (strcasestr(cur, "twitter.com/") || strcasestr(cur, "mlfw.info") || strcasestr(cur, "mylittlefacewhen.com"))
1209                                 return;
1210                         internal_link(b, nick, host, chan, cur, 0);
1211                         break;
1212                 }
1213         }
1214 }
1215
1216 static struct command_hash unhashed[] = {
1217         { "1", command_coinflip },
1218         { "get", command_get },
1219         { "hug", command_hug },
1220         { "hugs", command_hugs },
1221         { "mfw", command_mfw },
1222         { "swear", command_swear },
1223         { "mail", command_mail },
1224         { "seen", command_seen },
1225         { "derpy", command_derpy },
1226
1227         { "rebuild", command_rebuild, 1 },
1228         { "abort", command_abort, 1 },
1229         { "crash", command_crash, 1 },
1230         { "inspect", command_inspect, 1 },
1231         { "timeout", command_timeout, 1 },
1232
1233         { "follow", command_follow },
1234         { "unfollow", command_unfollow },
1235         { "feeds", command_feeds },
1236
1237 // DEBUG
1238         { "feed_get", command_feed_get, 1 },
1239         { "feed_set", command_feed_set, 1 },
1240         { "feed_rem", command_feed_rem, 1 },
1241         { "feed_xxx", command_feed_xxx, 1 },
1242         { "feed_counter", command_feed_counter, 1 },
1243         { "seen_xxx", command_seen_xxx, 1 },
1244         { "mailbag", command_mailbag, 1 },
1245         { "\"deliver\"", command_no_deliver, 1 },
1246 };
1247
1248 static void init_hash(struct bio *b, const char *target)
1249 {
1250         int i;
1251         for (i = 0; i < elements(unhashed); ++i) {
1252                 unsigned h = strhash(unhashed[i].string) % elements(commands);
1253                 if (commands[h].string)
1254                         privmsg(b, target, "%s is a duplicate command with %s", commands[h].string, unhashed[i].string);
1255                 else
1256                         commands[h] = unhashed[i];
1257         }
1258 #ifdef local_commands
1259         for (i = 0; i < elements(local_commands); ++i) {
1260                 unsigned h = strhash(local_commands[i].string) % elements(commands);
1261                 if (commands[h].string)
1262                         privmsg(b, target, "%s is a duplicate command with %s", commands[h].string, local_commands[i].string);
1263                 else
1264                         commands[h] = local_commands[i];
1265         }
1266 #endif
1267 }
1268
1269 void init_hook(struct bio *b, const char *target, const char *nick, unsigned is_ponified)
1270 {
1271         char *cwd, *path = NULL;
1272         nick_self = nick;
1273         static const char *messages[] = {
1274                 "feels circuits being activated that weren't before",
1275                 "suddenly gets a better feel of her surroundings",
1276                 "looks the same, yet there's definitely something different",
1277                 "emits a beep as her lights begin to pulse slowly",
1278                 "whirrrs and bleeps like never before",
1279                 "bleeps a few times happily",
1280                 "excitedly peeks at her surroundings"
1281         };
1282         init_hash(b, target);
1283         ponify = is_ponified;
1284
1285         cwd = getcwd(NULL, 0);
1286         asprintf(&path, "%s/db/feed.tdb", cwd);
1287         feed_db = tdb_open(path, 0, 0, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644);
1288         free(path);
1289         if (!feed_db)
1290                 privmsg(b, target, "Opening feed db failed: %m");
1291
1292         asprintf(&path, "%s/db/chan.tdb", cwd);
1293         chan_db = tdb_open(path, 0, 0, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644);
1294         free(path);
1295         if (!chan_db)
1296                 privmsg(b, target, "Opening chan db failed: %m");
1297
1298         asprintf(&path, "%s/db/mail.tdb", cwd);
1299         mail_db = tdb_open(path, 0, 0, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644);
1300         free(path);
1301         if (!mail_db)
1302                 privmsg(b, target, "Opening mail db failed: %m");
1303
1304         asprintf(&path, "%s/db/seen.tdb", cwd);
1305         seen_db = tdb_open(path, 0, 0, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644);
1306         free(path);
1307         if (!seen_db)
1308                 privmsg(b, target, "Opening seen db failed: %m");
1309
1310         free(cwd);
1311         action(b, target, "%s", messages[getrand() % elements(messages)]);
1312 }
1313
1314 static void  __attribute__((destructor)) shutdown_hook(void)
1315 {
1316         if (seen_db)
1317                 tdb_close(seen_db);
1318         if (mail_db)
1319                 tdb_close(mail_db);
1320         if (feed_db)
1321                 tdb_close(feed_db);
1322         if (chan_db)
1323                 tdb_close(chan_db);
1324 }
1325
1326 static char *nom_special(char *line)
1327 {
1328         while (*line) {
1329                 if (*line == 0x03) {
1330                         line++;
1331                         if (*line >= '0' && *line <= '9')
1332                                 line++;
1333                         else continue;
1334                         if (*line >= '0' && *line <= '9')
1335                                 line++;
1336                         if (line[0] == ',' && line[1] >= '0' && line[1] <= '9')
1337                                 line += 2;
1338                         else continue;
1339                         if (*line >= '0' && *line <= '9')
1340                                 line++;
1341                 } else if (*line != 0x02 && *line != 0x1f && *line != 0x16 && *line != 0x06 && *line != 0x07)
1342                         return line;
1343                 else
1344                         line++;
1345         }
1346         return line;
1347 }
1348
1349 static char *cleanup_special(char *line)
1350 {
1351         char *cur, *start = nom_special(line);
1352         if (!*start)
1353                 return NULL;
1354         for (line = cur = start; *line; line = nom_special(line))
1355                 *(cur++) = *(line++);
1356
1357         for (cur--; cur >= start; --cur)
1358                 if (*cur != ' ' && *cur != '\001')
1359                         break;
1360
1361         if (cur < start)
1362                 return NULL;
1363         cur[1] = 0;
1364         return start;
1365 }
1366
1367 static void rss_check(struct bio *b, const char *channel, int64_t t)
1368 {
1369         static unsigned rss_enter, rss_leave;
1370         if (t >= 0 && rss_enter == rss_leave) {
1371                 rss_enter++;
1372                 channel_feed_check(b, channel, t);
1373                 rss_leave++;
1374         }
1375 }
1376
1377 void privmsg_hook(struct bio *b, const char *prefix, const char *ident, const char *host,
1378                   const char *const *args, unsigned nargs)
1379 {
1380         char *cmd_args, *cmd;
1381         const char *target = args[0][0] == '#' ? args[0] : prefix;
1382         unsigned chan, nick_len;
1383         struct command_hash *c;
1384         int64_t t = get_time(b, target);
1385         int is_admin = admin(host);
1386
1387         chan = args[0][0] == '#';
1388         if (chan) {
1389                 rss_check(b, args[0], t);
1390                 command_deliver(b, prefix, args[0]);
1391         }
1392         cmd_args = cleanup_special((char*)args[1]);
1393         if (!cmd_args)
1394                 return;
1395
1396         if (ident && (!strcasecmp(ident, "Revolver") || !strcasecmp(ident, "Rev")))
1397                 return;
1398
1399         if (chan && cmd_args[0] == '!') {
1400                 cmd_args++;
1401         } else if (chan && (nick_len = strlen(nick_self)) &&
1402                 !strncasecmp(cmd_args, nick_self, nick_len) &&
1403                 (cmd_args[nick_len] == ':' || cmd_args[nick_len] == ',') && cmd_args[nick_len+1] == ' ') {
1404                 cmd_args += nick_len + 2;
1405                 if (!cmd_args[0])
1406                         return;
1407                 chan = 2;
1408         } else if (chan) {
1409                 if (command_channel.enter == command_channel.left) {
1410                         command_channel.enter++;
1411                         snprintf(command_channel.failed_command,
1412                                  sizeof(command_channel) - offsetof(struct command_hash, failed_command) - 1,
1413                                  "%s:%s (%s@%s) \"#\" %s", target, prefix, ident, host, cmd_args);
1414                         channel_msg(b, prefix, host, args[0], cmd_args, t);
1415                         command_channel.left++;
1416                 }
1417                 return;
1418         }
1419         cmd = token(&cmd_args, ' ');
1420         if (!chan && cmd_args && cmd_args[0] == '#') {
1421                 if (!is_admin) {
1422                         privmsg(b, prefix, "%s: { Error... }", prefix);
1423                         return;
1424                 }
1425                 target = token(&cmd_args, ' ');
1426         }
1427
1428         c = &commands[strhash(cmd) % elements(commands)];
1429         if (c->string && !strcasecmp(c->string, cmd)) {
1430                 if (c->left != c->enter)
1431                         privmsg(b, target, "Command %s is disabled because of a crash", c->string);
1432                 else if (t > 0 && t < c->disabled_until && !is_admin) {
1433                         int64_t delta = c->disabled_until - t;
1434                         const char *str = perty(&delta);
1435                         b->writeline(b, "NOTICE %s :Command %s is on timeout for the next %"PRIi64 " %s", prefix, c->string, delta, str);
1436                 } else if (c->admin && !is_admin) {
1437                         static const char *insults[] = {
1438                                 "{ Rarity, I love you so much! }",
1439                                 "{ Rarity, have I ever told you that I love you? }",
1440                                 "{ Yes, I love my sister, Rarity. }",
1441                                 "{ Raaaaaaaaaaaaaarity. }",
1442                                 "{ You do not fool me, Rari...bot! }"
1443                         };
1444                         privmsg(b, target, "%s: %s", prefix, insults[getrand() % elements(insults)]);
1445                 } else {
1446                         c->enter++;
1447                         snprintf(c->failed_command, sizeof(*c) - offsetof(struct command_hash, failed_command) - 1,
1448                                  "%s:%s (%s@%s) \"%s\" %s", target, prefix, ident, host, cmd, cmd_args);
1449                         c->cmd(b, prefix, host, target, cmd_args);
1450                         c->left++;
1451                 }
1452         } else if (chan == 2)
1453                 privmsg(b, target, "%s: { I love you! }", prefix);
1454 }
1455
1456 void command_hook(struct bio *b, const char *prefix, const char *ident, const char *host,
1457                   const char *command, const char *const *args, unsigned nargs)
1458 {
1459         char *buf = NULL;
1460         int64_t t = -1;
1461         if (!strcasecmp(command, "NOTICE")) {
1462                 if (nargs < 2 || args[0][0] == '#')
1463                         return;
1464                 if (admin(host))
1465                         b->writeline(b, "%s", args[1]);
1466                 else
1467                         fprintf(stderr, "%s: %s\n", prefix, args[1]);
1468         } else if (!strcasecmp(command, "JOIN")) {
1469                 t = get_time(b, args[0]);
1470                 rss_check(b, args[0], t);
1471                 command_deliver(b, prefix, args[0]);
1472                 asprintf(&buf, "%"PRIi64",joining %s", t, args[0]);
1473         } else if (!strcasecmp(command, "PART")) {
1474                 t = get_time(b, args[0]);
1475                 rss_check(b, args[0], t);
1476                 asprintf(&buf, "%"PRIi64",leaving %s", t, args[0]);
1477         } else if (!strcasecmp(command, "QUIT")) {
1478                 t = get_time(b, NULL);
1479                 asprintf(&buf, "%"PRIi64",quitting with the message \"%s\"", t, args[0]);
1480         } else if (!strcasecmp(command, "NICK")) {
1481                 t = get_time(b, NULL);
1482                 if (t >= 0) {
1483                         asprintf(&buf, "%"PRIi64",changing nick from %s", t, prefix);
1484                         if (buf)
1485                                 update_seen(b, buf, args[0]);
1486                         free(buf);
1487                         buf = NULL;
1488                 }
1489                 asprintf(&buf, "%"PRIi64",changing nick to %s", t, args[0]);
1490         } else if (0) {
1491                 int i;
1492                 fprintf(stderr, ":%s!%s%s %s", prefix, ident, host, command);
1493                 for (i = 0; i < nargs; ++i)
1494                         fprintf(stderr, " %s", args[i]);
1495                 fprintf(stderr, "\n");
1496         }
1497         if (t >= 0 && buf)
1498                 update_seen(b, buf, prefix);
1499         free(buf);
1500         return;
1501 }
1502