proxyscan/proxyscan.c

   1
   2 #include "proxyscan.h"
   3
   4 #include <sys/poll.h>
   5 #include <sys/types.h>
   6 #include <sys/socket.h>
   7 #include <netdb.h>
   8 #include "../core/error.h"
   9 #include "../core/events.h"
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <errno.h>
  13 #include "../nick/nick.h"
  14 #include "../core/hooks.h"
  15 #include "../lib/sstring.h"
  16 #include "../irc/irc_config.h"
  17 #include "../localuser/localuser.h"
  18 #include "../core/config.h"
  19 #include <unistd.h>
  20 #include "../core/schedule.h"
  21 #include <string.h>
  22 #include "../irc/irc.h"
  23 #include "../lib/irc_string.h"
  24 #include "../lib/version.h"
  25 #include "../channel/channel.h"
  26 #include "../localuser/localuserchannel.h"
  27 #include "../core/nsmalloc.h"
  28 #include "../lib/irc_ipv6.h"
  29
  30 MODULE_VERSION("")
  31
  32 #define SCANTIMEOUT      60
  33
  34 #define SCANHOSTHASHSIZE 1000
  35 #define SCANHASHSIZE     400
  36
  37 /* It's unlikely you'll get 100k of preamble before a connect... */
  38 #define READ_SANITY_LIMIT 102400
  39
  40 scan *scantable[SCANHASHSIZE];
  41
  42 CommandTree *ps_commands;
  43
  44 int listenfd;
  45 int activescans;
  46 int maxscans;
  47 int queuedhosts;
  48 int scansdone;
  49 int rescaninterval;
  50 int warningsent;
  51 int glinedhosts;
  52 time_t ps_starttime;
  53 int ps_cache_ext;
  54 int ps_extscan_ext;
  55 int ps_ready;
  56
  57 int numscans; /* number of scan types currently valid */
  58 scantype thescans[PSCAN_MAXSCANS];
  59
  60 unsigned int hitsbyclass[10];
  61 unsigned int scansbyclass[10];
  62
  63 unsigned int myip;
  64 sstring *myipstr;
  65 unsigned short listenport;
  66 int brokendb;
  67
  68 unsigned int ps_mailip;
  69 unsigned int ps_mailport;
  70 sstring *ps_mailname;
  71
  72 unsigned long scanspermin;
  73 unsigned long tempscanspermin=0;
  74 unsigned long lastscants=0;
  75
  76 unsigned int ps_start_ts=0;
  77
  78 nick *proxyscannick;
  79
  80 FILE *ps_logfile;
  81
  82 /* Local functions */
  83 void handlescansock(int fd, short events);
  84 void timeoutscansock(void *arg);
  85 void proxyscan_newnick(int hooknum, void *arg);
  86 void proxyscan_lostnick(int hooknum, void *arg);
  87 void proxyscan_onconnect(int hooknum, void *arg);
  88 void proxyscanuserhandler(nick *target, int message, void **params);
  89 void registerproxyscannick();
  90 void killsock(scan *sp, int outcome);
  91 void killallscans();
  92 void proxyscanstats(int hooknum, void *arg);
  93 void sendlagwarning();
  94 void proxyscan_newip(nick *np, unsigned long ip);
  95 int proxyscan_addscantype(int type, int port);
  96 int proxyscan_delscantype(int type, int port);
  97
  98 int proxyscandostatus(void *sender, int cargc, char **cargv);
  99 int proxyscandebug(void *sender, int cargc, char **cargv);
 100 int proxyscandosave(void *sender, int cargc, char **cargv);
 101 int proxyscandospew(void *sender, int cargc, char **cargv);
 102 int proxyscandoshowkill(void *sender, int cargc, char **cargv);
 103 int proxyscandoscan(void *sender, int cargc, char **cargv);
 104 int proxyscandoaddscan(void *sender, int cargc, char **cargv);
 105 int proxyscandodelscan(void *sender, int cargc, char **cargv);
 106 int proxyscandoshowcommands(void *sender, int cargc, char **cargv);
 107
 108 int proxyscan_addscantype(int type, int port) {
 109   /* Check we have a spare scan slot */
 110
 111   if (numscans>=PSCAN_MAXSCANS)
 112     return 1;
 113
 114   thescans[numscans].type=type;
 115   thescans[numscans].port=port;
 116   thescans[numscans].hits=0;
 117
 118   numscans++;
 119
 120   return 0;
 121 }
 122
 123 int proxyscan_delscantype(int type, int port) {
 124   int i;
 125
 126   for (i=0;i<numscans;i++)
 127     if (thescans[i].type==type && thescans[i].port==port)
 128       break;
 129
 130   if (i>=numscans)
 131     return 1;
 132
 133   memmove(thescans+i, thescans+(i+1), (PSCAN_MAXSCANS-(i+1)) * sizeof(scantype));
 134   numscans--;
 135
 136   return 0;
 137 }
 138
 139 void _init(void) {
 140   sstring *cfgstr;
 141   int ipbits[4];
 142
 143   ps_start_ts = time(NULL);
 144   ps_ready = 0;
 145   ps_commands = NULL;
 146
 147   ps_cache_ext = registernodeext("proxyscancache");
 148   if( ps_cache_ext == -1 ) {
 149     Error("proxyscan",ERR_INFO,"failed to reg node ext");
 150     return;
 151   }
 152   ps_extscan_ext = registernodeext("proxyscanextscan");
 153   if ( ps_extscan_ext == -1) {
 154     Error("proxyscan",ERR_INFO,"failed to reg node ext");
 155     return;
 156   }
 157
 158   memset(scantable,0,sizeof(scantable));
 159   maxscans=200;
 160   activescans=0;
 161   queuedhosts=0;
 162   scansdone=0;
 163   warningsent=0;
 164   ps_starttime=time(NULL);
 165   glinedhosts=0;
 166
 167   scanspermin=0;
 168   lastscants=time(NULL);
 169
 170   /* Listen port */
 171   cfgstr=getcopyconfigitem("proxyscan","port","9999",6);
 172   listenport=strtol(cfgstr->content,NULL,10);
 173   freesstring(cfgstr);
 174
 175   /* Max concurrent scans */
 176   cfgstr=getcopyconfigitem("proxyscan","maxscans","200",5);
 177   maxscans=strtol(cfgstr->content,NULL,10);
 178   freesstring(cfgstr);
 179
 180   /* Clean host timeout */
 181   cfgstr=getcopyconfigitem("proxyscan","rescaninterval","3600",7);
 182   rescaninterval=strtol(cfgstr->content,NULL,10);
 183   cachehostinit(rescaninterval);
 184   freesstring(cfgstr);
 185
 186   /* this default will NOT work well */
 187   myipstr=getcopyconfigitem("proxyscan","ip","127.0.0.1",16);
 188
 189   sscanf(myipstr->content,"%d.%d.%d.%d",&ipbits[0],&ipbits[1],&ipbits[2],&ipbits[3]);
 190
 191   myip=((ipbits[0]&0xFF)<<24)+((ipbits[1]&0xFF)<<16)+
 192     ((ipbits[2]&0xFF)<<8)+(ipbits[3]&0xFF);
 193
 194 #if defined(PROXYSCAN_MAIL)
 195   /* Mailer host */
 196   cfgstr=getcopyconfigitem("proxyscan","mailerip","",16);
 197
 198   psm_mailerfd=-1;
 199   if (cfgstr) {
 200     sscanf(cfgstr->content,"%d.%d.%d.%d",&ipbits[0],&ipbits[1],&ipbits[2],&ipbits[3]);
 201     ps_mailip = ((ipbits[0]&0xFF)<<24)+((ipbits[1]&0xFF)<<16)+
 202                  ((ipbits[2]&0xFF)<<8)+(ipbits[3]&0xFF);
 203     ps_mailport=25;
 204     freesstring(cfgstr);
 205
 206     ps_mailname=getcopyconfigitem("proxyscan","mailname","some.mail.server",HOSTLEN);
 207     Error("proxyscan",ERR_INFO,"Proxyscan mailer enabled; mailing to %s as %s.",IPlongtostr(ps_mailip),ps_mailname->content);
 208   } else {
 209     ps_mailport=0;
 210     ps_mailname=NULL;
 211   }
 212 #endif
 213
 214   proxyscannick=NULL;
 215   /* Set up our nick on the network */
 216   scheduleoneshot(time(NULL),&registerproxyscannick,NULL);
 217
 218   registerhook(HOOK_SERVER_END_OF_BURST, &proxyscan_onconnect);
 219
 220   registerhook(HOOK_NICK_NEWNICK,&proxyscan_newnick);
 221
 222   registerhook(HOOK_CORE_STATSREQUEST,&proxyscanstats);
 223
 224   /* Read in the clean hosts */
 225   loadcachehosts();
 226
 227   /* Read in any custom ports to scan */
 228   loadextrascans();
 229
 230   /* Set up the database */
 231   if ((proxyscandbinit())!=0) {
 232     brokendb=1;
 233   } else {
 234     brokendb=0;
 235   }
 236
 237   ps_commands = newcommandtree();
 238   addcommandtotree(ps_commands, "showcommands", 0, 0, &proxyscandoshowcommands);
 239   addcommandtotree(ps_commands, "status", 0, 0, &proxyscandostatus);
 240   addcommandtotree(ps_commands, "listopen", 0, 0, &proxyscandolistopen);
 241   addcommandtotree(ps_commands, "save", 0, 0, &proxyscandosave);
 242   addcommandtotree(ps_commands, "spew", 0, 0, &proxyscandospew);
 243   addcommandtotree(ps_commands, "showkill", 0, 0, &proxyscandoshowkill);
 244   addcommandtotree(ps_commands, "scan", 0, 0, &proxyscandoscan);
 245   addcommandtotree(ps_commands, "addscan", 0, 0, &proxyscandoaddscan);
 246   addcommandtotree(ps_commands, "delscan", 0, 0, &proxyscandodelscan);
 247
 248   /* Default scan types */
 249   proxyscan_addscantype(STYPE_HTTP, 8080);
 250   proxyscan_addscantype(STYPE_HTTP, 80);
 251   proxyscan_addscantype(STYPE_HTTP, 6588);
 252   proxyscan_addscantype(STYPE_HTTP, 8000);
 253   proxyscan_addscantype(STYPE_HTTP, 3128);
 254   proxyscan_addscantype(STYPE_HTTP, 3802);
 255   proxyscan_addscantype(STYPE_HTTP, 5490);
 256   proxyscan_addscantype(STYPE_HTTP, 7441);
 257   proxyscan_addscantype(STYPE_HTTP, 808);
 258   proxyscan_addscantype(STYPE_HTTP, 3332);
 259   proxyscan_addscantype(STYPE_HTTP, 2282);
 260   proxyscan_addscantype(STYPE_SOCKS4, 559);
 261   proxyscan_addscantype(STYPE_SOCKS4, 1080);
 262   proxyscan_addscantype(STYPE_SOCKS5, 1080);
 263   proxyscan_addscantype(STYPE_SOCKS4, 1075);
 264   proxyscan_addscantype(STYPE_SOCKS5, 1075);
 265   proxyscan_addscantype(STYPE_SOCKS4, 2280);
 266   proxyscan_addscantype(STYPE_SOCKS5, 2280);
 267   proxyscan_addscantype(STYPE_SOCKS4, 1180);
 268   proxyscan_addscantype(STYPE_SOCKS5, 1180);
 269   proxyscan_addscantype(STYPE_SOCKS4, 9999);
 270   proxyscan_addscantype(STYPE_SOCKS5, 9999);
 271   proxyscan_addscantype(STYPE_WINGATE, 23);
 272   proxyscan_addscantype(STYPE_CISCO, 23);
 273   proxyscan_addscantype(STYPE_WINGATE, 1181);
 274   proxyscan_addscantype(STYPE_SOCKS5, 1978);
 275   proxyscan_addscantype(STYPE_SOCKS5, 1029);
 276   proxyscan_addscantype(STYPE_SOCKS5, 3801);
 277   proxyscan_addscantype(STYPE_SOCKS5, 3331);
 278   proxyscan_addscantype(STYPE_HTTP, 65506);
 279   proxyscan_addscantype(STYPE_HTTP, 63809);
 280   proxyscan_addscantype(STYPE_HTTP, 63000);
 281   proxyscan_addscantype(STYPE_SOCKS4, 29992);
 282   proxyscan_addscantype(STYPE_DIRECT_IRC, 6667);
 283   proxyscan_addscantype(STYPE_DIRECT_IRC, 6668);
 284   proxyscan_addscantype(STYPE_DIRECT_IRC, 6669);
 285   proxyscan_addscantype(STYPE_DIRECT_IRC, 6670);
 286
 287   /* Schedule saves */
 288   schedulerecurring(time(NULL)+3600,0,3600,&dumpcachehosts,NULL);
 289
 290   ps_logfile=fopen("logs/proxyscan.log","a");
 291
 292   if (connected) {
 293     /* if we're already connected, assume we're just reloading module (i.e. have a completed burst) */
 294     ps_ready = 1;
 295     startqueuedscans();
 296   }
 297 }
 298
 299 void registerproxyscannick(void *arg) {
 300   sstring *psnick,*psuser,*pshost,*psrealname;
 301   /* Set up our nick on the network */
 302   channel *cp;
 303
 304   psnick=getcopyconfigitem("proxyscan","nick","P",NICKLEN);
 305   psuser=getcopyconfigitem("proxyscan","user","proxyscan",USERLEN);
 306   pshost=getcopyconfigitem("proxyscan","host","some.host",HOSTLEN);
 307   psrealname=getcopyconfigitem("proxyscan","realname","Proxyscan",REALLEN);
 308
 309   proxyscannick=registerlocaluser(psnick->content,psuser->content,pshost->content,
 310                                   psrealname->content,
 311                                   NULL,UMODE_OPER|UMODE_SERVICE|UMODE_DEAF,
 312                                   &proxyscanuserhandler);
 313
 314   freesstring(psnick);
 315   freesstring(psuser);
 316   freesstring(pshost);
 317   freesstring(psrealname);
 318
 319   cp=findchannel("#twilightzone");
 320   if (!cp) {
 321     localcreatechannel(proxyscannick,"#twilightzone");
 322   } else {
 323     localjoinchannel(proxyscannick,cp);
 324     localgetops(proxyscannick,cp);
 325   }
 326 }
 327
 328 void _fini(void) {
 329
 330   deregisterlocaluser(proxyscannick,NULL);
 331
 332   deregisterhook(HOOK_SERVER_END_OF_BURST, &proxyscan_onconnect);
 333
 334   deregisterhook(HOOK_NICK_NEWNICK,&proxyscan_newnick);
 335
 336   deregisterhook(HOOK_CORE_STATSREQUEST,&proxyscanstats);
 337
 338   deleteschedule(NULL,&dumpcachehosts,NULL);
 339
 340   destroycommandtree(ps_commands);
 341
 342   /* Kill any scans in progress */
 343   killallscans();
 344
 345   /* Dump the database - AFTER killallscans() which prunes it */
 346   dumpcachehosts(NULL);
 347
 348   /* dump any cached hosts before deleting the extensions */
 349   releasenodeext(ps_cache_ext);
 350   releasenodeext(ps_extscan_ext);
 351
 352   /* free() all our structures */
 353   nsfreeall(POOL_PROXYSCAN);
 354
 355   freesstring(myipstr);
 356   freesstring(ps_mailname);
 357 #if defined(PROXYSCAN_MAIL)
 358   if (psm_mailerfd!=-1)
 359     deregisterhandler(psm_mailerfd,1);
 360 #endif
 361
 362   if (ps_logfile)
 363     fclose(ps_logfile);
 364 }
 365
 366 void proxyscanuserhandler(nick *target, int message, void **params) {
 367   nick *sender;
 368   Command *ps_command;
 369   char *cargv[20];
 370   int cargc;
 371
 372   switch(message) {
 373   case LU_KILLED:
 374     scheduleoneshot(time(NULL)+1,&registerproxyscannick,NULL);
 375     proxyscannick=NULL;
 376     break;
 377
 378   case LU_PRIVMSG:
 379   case LU_SECUREMSG:
 380     sender=(nick *)params[0];
 381
 382     if (IsOper(sender)) {
 383       cargc = splitline((char *)params[1], cargv, 20, 0);
 384
 385       if ( cargc == 0 )
 386         return;
 387
 388       ps_command = findcommandintree(ps_commands, cargv[0], 1);
 389
 390       if ( !ps_command ) {
 391         sendnoticetouser(proxyscannick,sender, "Unknown command.");
 392         return;
 393       }
 394
 395       if ( ps_command->maxparams < (cargc-1) ) {
 396         rejoinline(cargv[ps_command->maxparams], cargc - (ps_command->maxparams));
 397         cargc = (ps_command->maxparams) + 1;
 398       }
 399
 400       (ps_command->handler)((void *)sender, cargc - 1, &(cargv[1]));
 401       break;
 402     }
 403
 404   default:
 405     break;
 406   }
 407 }
 408
 409 void addscantohash(scan *sp) {
 410   int hash;
 411   hash=(sp->fd)%SCANHASHSIZE;
 412
 413   sp->next=scantable[hash];
 414   scantable[hash]=sp;
 415
 416   activescans++;
 417 }
 418
 419 void delscanfromhash(scan *sp) {
 420   int hash;
 421   scan **sh;
 422
 423   hash=(sp->fd)%SCANHASHSIZE;
 424
 425   for (sh=&(scantable[hash]);*sh;sh=&((*sh)->next)) {
 426     if (*sh==sp) {
 427       (*sh)=sp->next;
 428       break;
 429     }
 430   }
 431
 432   activescans--;
 433 }
 434
 435 scan *findscan(int fd) {
 436   int hash;
 437   scan *sp;
 438
 439   hash=fd%SCANHASHSIZE;
 440
 441   for (sp=scantable[hash];sp;sp=sp->next)
 442     if (sp->fd==fd)
 443       return sp;
 444
 445   return NULL;
 446 }
 447
 448 void startscan(patricia_node_t *node, int type, int port, int class) {
 449   scan *sp;
 450   float scantmp;
 451
 452   if (scansdone>maxscans)
 453   {
 454     /* ignore the first maxscans as this will skew our scans per second! */
 455     tempscanspermin++;
 456     if ((lastscants+60) <= time(NULL))
 457     {
 458       /* ok, at least 60 seconds has passed, calculate the scans per minute figure */
 459       scantmp = time(NULL) - lastscants;
 460       scantmp = tempscanspermin / scantmp;
 461       scantmp = (scantmp * 60);
 462       scanspermin = scantmp;
 463       lastscants = time(NULL);
 464       tempscanspermin = 0;
 465     }
 466   }
 467
 468   sp=getscan();
 469
 470   sp->outcome=SOUTCOME_INPROGRESS;
 471   sp->port=port;
 472   sp->node=node;
 473   sp->type=type;
 474   sp->class=class;
 475   sp->bytesread=0;
 476   sp->totalbytesread=0;
 477   memset(sp->readbuf, '\0', PSCAN_READBUFSIZE);
 478
 479   sp->fd=createconnectsocket(irc_in_addr_v4_to_int(&((patricia_node_t *)sp->node)->prefix->sin),sp->port);
 480   sp->state=SSTATE_CONNECTING;
 481   if (sp->fd<0) {
 482     /* Couldn't set up the socket? */
 483     derefnode(iptree,sp->node);
 484     freescan(sp);
 485     return;
 486   }
 487   /* Wait until it is writeable */
 488   registerhandler(sp->fd,POLLERR|POLLHUP|POLLOUT,&handlescansock);
 489   /* And set a timeout */
 490   sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 491   addscantohash(sp);
 492 }
 493
 494 void timeoutscansock(void *arg) {
 495   scan *sp=(scan *)arg;
 496
 497   killsock(sp, SOUTCOME_CLOSED);
 498 }
 499
 500 void killsock(scan *sp, int outcome) {
 501   int i;
 502   cachehost *chp;
 503   foundproxy *fpp;
 504
 505   scansdone++;
 506   scansbyclass[sp->class]++;
 507
 508   /* Remove the socket from the schedule/event lists */
 509   deregisterhandler(sp->fd,1);  /* this will close the fd for us */
 510   deleteschedule(sp->sch,&timeoutscansock,(void *)sp);
 511
 512   sp->outcome=outcome;
 513   delscanfromhash(sp);
 514
 515   /* See if we need to queue another scan.. */
 516   if (sp->outcome==SOUTCOME_CLOSED &&
 517       ((sp->class==SCLASS_CHECK) ||
 518        (sp->class==SCLASS_NORMAL && (sp->state==SSTATE_SENTREQUEST || sp->state==SSTATE_GOTRESPONSE))))
 519     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS2, time(NULL)+300);
 520
 521   if (sp->outcome==SOUTCOME_CLOSED && sp->class==SCLASS_PASS2)
 522     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS3, time(NULL)+300);
 523
 524   if (sp->outcome==SOUTCOME_CLOSED && sp->class==SCLASS_PASS3)
 525     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS4, time(NULL)+300);
 526
 527   if (sp->outcome==SOUTCOME_OPEN) {
 528     hitsbyclass[sp->class]++;
 529
 530     /* Lets try and get the cache record.  If there isn't one, make a new one. */
 531     if (!(chp=findcachehost(sp->node))) {
 532       chp=addcleanhost(time(NULL));
 533       patricia_ref_prefix(sp->node->prefix);
 534       sp->node->exts[ps_cache_ext] = chp;
 535     }
 536     /* Stick it on the cache's list of proxies, if necessary */
 537     for (fpp=chp->proxies;fpp;fpp=fpp->next)
 538       if (fpp->type==sp->type && fpp->port==sp->port)
 539         break;
 540
 541     if (!fpp) {
 542       fpp=getfoundproxy();
 543       fpp->type=sp->type;
 544       fpp->port=sp->port;
 545       fpp->next=chp->proxies;
 546       chp->proxies=fpp;
 547     }
 548
 549     if (!chp->glineid) {
 550       glinedhosts++;
 551       loggline(chp, sp->node);
 552       irc_send("%s GL * +*@%s 1800 %jd :Open Proxy, see http://www.quakenet.org/openproxies.html - ID: %d",
 553                mynumeric->content,IPtostr(((patricia_node_t *)sp->node)->prefix->sin),(intmax_t)getnettime(), chp->glineid);
 554       Error("proxyscan",ERR_DEBUG,"Found open proxy on host %s",IPtostr(((patricia_node_t *)sp->node)->prefix->sin));
 555     } else {
 556       loggline(chp, sp->node);  /* Update log only */
 557     }
 558
 559     /* Update counter */
 560     for(i=0;i<numscans;i++) {
 561       if (thescans[i].type==sp->type && thescans[i].port==sp->port) {
 562         thescans[i].hits++;
 563         break;
 564       }
 565     }
 566   }
 567
 568   freescan(sp);
 569
 570   /* kick the queue.. */
 571   startqueuedscans();
 572 }
 573
 574 void handlescansock(int fd, short events) {
 575   scan *sp;
 576   char buf[512];
 577   int res;
 578   int i;
 579   unsigned long netip;
 580   unsigned short netport;
 581
 582   if ((sp=findscan(fd))==NULL) {
 583     /* Not found; return and hope it goes away */
 584     Error("proxyscan",ERR_ERROR,"Unexpected message from fd %d",fd);
 585     return;
 586   }
 587
 588   /* It woke up, delete the alarm call.. */
 589   deleteschedule(sp->sch,&timeoutscansock,(void *)sp);
 590
 591   if (events & (POLLERR|POLLHUP)) {
 592     /* Some kind of error; give up on this socket */
 593     if (sp->state==SSTATE_GOTRESPONSE) {
 594       /* If the error occured while we were waiting for a response, we might have
 595        * received the "OPEN PROXY!" message and the EOF at the same time, so continue
 596        * processing */
 597 /*      Error("proxyscan",ERR_DEBUG,"Got error in GOTRESPONSE state for %s, continuing.",IPtostr(sp->host->IP)); */
 598     } else {
 599       killsock(sp, SOUTCOME_CLOSED);
 600       return;
 601     }
 602   }
 603
 604   /* Otherwise, we got what we wanted.. */
 605
 606   switch(sp->state) {
 607   case SSTATE_CONNECTING:
 608     /* OK, we got activity while connecting, so we're going to send some
 609      * request depending on scan type.  However, we can reregister everything
 610      * here to save duplicate code: This code is common for all handlers */
 611
 612     /* Delete the old handler */
 613     deregisterhandler(fd,0);
 614     /* Set the new one */
 615     registerhandler(fd,POLLERR|POLLHUP|POLLIN,&handlescansock);
 616     sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 617     /* Update state */
 618     sp->state=SSTATE_SENTREQUEST;
 619
 620     switch(sp->type) {
 621     case STYPE_HTTP:
 622       sprintf(buf,"CONNECT %s:%d HTTP/1.0\r\n\r\n",myipstr->content,listenport);
 623       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 624         /* We didn't write the full amount, DIE */
 625         killsock(sp,SOUTCOME_CLOSED);
 626         return;
 627       }
 628       break;
 629
 630     case STYPE_SOCKS4:
 631       /* set up the buffer */
 632       netip=htonl(myip);
 633       netport=htons(listenport);
 634       memcpy(&buf[4],&netip,4);
 635       memcpy(&buf[2],&netport,2);
 636       buf[0]=4;
 637       buf[1]=1;
 638       buf[8]=0;
 639       if ((write(fd,buf,9))<9) {
 640         /* Didn't write enough, give up */
 641         killsock(sp,SOUTCOME_CLOSED);
 642         return;
 643       }
 644       break;
 645
 646     case STYPE_SOCKS5:
 647       /* Set up initial request buffer */
 648       buf[0]=5;
 649       buf[1]=1;
 650       buf[2]=0;
 651       if ((write(fd,buf,3))>3) {
 652         /* Didn't write enough, give up */
 653         killsock(sp,SOUTCOME_CLOSED);
 654         return;
 655       }
 656
 657       /* Now the actual connect request */
 658       buf[0]=5;
 659       buf[1]=1;
 660       buf[2]=0;
 661       buf[3]=1;
 662       netip=htonl(myip);
 663       netport=htons(listenport);
 664       memcpy(&buf[4],&netip,4);
 665       memcpy(&buf[8],&netport,2);
 666       res=write(fd,buf,10);
 667       if (res<10) {
 668         killsock(sp,SOUTCOME_CLOSED);
 669         return;
 670       }
 671       break;
 672
 673     case STYPE_WINGATE:
 674       /* Send wingate request */
 675       sprintf(buf,"%s:%d\r\n",myipstr->content,listenport);
 676       if((write(fd,buf,strlen(buf)))<strlen(buf)) {
 677         killsock(sp,SOUTCOME_CLOSED);
 678         return;
 679       }
 680       break;
 681
 682     case STYPE_CISCO:
 683       /* Send cisco request */
 684       sprintf(buf,"cisco\r\n");
 685       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 686         killsock(sp, SOUTCOME_CLOSED);
 687         return;
 688       }
 689
 690       sprintf(buf,"telnet %s %d\r\n",myipstr->content,listenport);
 691       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 692         killsock(sp, SOUTCOME_CLOSED);
 693         return;
 694       }
 695
 696       break;
 697
 698     case STYPE_DIRECT:
 699       /* Do nothing */
 700       break;
 701
 702     case STYPE_DIRECT_IRC:
 703       sprintf(buf,"PRIVMSG\r\n");
 704       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 705         killsock(sp, SOUTCOME_CLOSED);
 706         return;
 707       }
 708
 709       /* Do nothing */
 710       break;
 711     }
 712     break;
 713
 714   case SSTATE_SENTREQUEST:
 715     res=read(fd, sp->readbuf+sp->bytesread, PSCAN_READBUFSIZE-sp->bytesread);
 716
 717     if (res<=0) {
 718       if ((errno!=EINTR && errno!=EWOULDBLOCK) || res==0) {
 719         /* EOF, forget it */
 720         killsock(sp, SOUTCOME_CLOSED);
 721         return;
 722       }
 723     }
 724
 725     sp->bytesread+=res;
 726     sp->totalbytesread+=res;
 727
 728     {
 729       char *magicstring;
 730       int magicstringlength;
 731
 732       if(sp->type != STYPE_DIRECT_IRC) {
 733         magicstring = MAGICSTRING;
 734         magicstringlength = MAGICSTRINGLENGTH;
 735       } else {
 736         magicstring = MAGICIRCSTRING;
 737         magicstringlength = MAGICIRCSTRINGLENGTH;
 738       }
 739
 740       for (i=0;i<sp->bytesread - magicstringlength;i++) {
 741         if (!strncmp(sp->readbuf+i, magicstring, magicstringlength)) {
 742           /* Found the magic string */
 743           /* If the offset is 0, this means it was the first thing we got from the socket,
 744            * so it's an actual IRCD (sheesh).  Note that when the buffer is full and moved,
 745            * the thing moved to offset 0 would previously have been tested as offset
 746            * PSCAN_READBUFSIZE/2.
 747            *
 748            * Skip this checking for STYPE_DIRECT scans, which are used to detect trojans setting
 749            * up portforwards (which will therefore show up as ircds, we rely on the port being
 750            * strange enough to avoid false positives */
 751           if (i==0 && (sp->type != STYPE_DIRECT)) {
 752             killsock(sp, SOUTCOME_CLOSED);
 753             return;
 754           }
 755
 756           killsock(sp, SOUTCOME_OPEN);
 757           return;
 758         }
 759       }
 760     }
 761
 762     /* If the buffer is full, move half of it along to make room */
 763     if (sp->bytesread == PSCAN_READBUFSIZE) {
 764       memcpy(sp->readbuf, sp->readbuf + (PSCAN_READBUFSIZE)/2, PSCAN_READBUFSIZE/2);
 765       sp->bytesread = PSCAN_READBUFSIZE/2;
 766     }
 767
 768     /* Don't read data forever.. */
 769     if (sp->totalbytesread > READ_SANITY_LIMIT) {
 770       killsock(sp, SOUTCOME_CLOSED);
 771       return;
 772     }
 773
 774     /* No magic string yet, we schedule another timeout in case it comes later. */
 775     sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 776     return;
 777   }
 778 }
 779
 780 void killallscans() {
 781   int i;
 782   scan *sp;
 783   cachehost *chp;
 784
 785   for(i=0;i<SCANHASHSIZE;i++) {
 786     for(sp=scantable[i];sp;sp=sp->next) {
 787       /* If there is a pending scan, delete it's clean host record.. */
 788       if ((chp=findcachehost(sp->node)) && !chp->proxies) {
 789         sp->node->exts[ps_cache_ext] = NULL;
 790         derefnode(iptree,sp->node);
 791         delcachehost(chp);
 792       }
 793
 794       if (sp->fd!=-1) {
 795         deregisterhandler(sp->fd,1);
 796         deleteschedule(sp->sch,&timeoutscansock,(void *)(sp));
 797       }
 798     }
 799   }
 800 }
 801
 802 void proxyscanstats(int hooknum, void *arg) {
 803   char buf[512];
 804
 805   sprintf(buf, "Proxyscn: %6d/%4d scans complete/in progress.  %d hosts queued.",
 806           scansdone,activescans,queuedhosts);
 807   triggerhook(HOOK_CORE_STATSREPLY,buf);
 808   sprintf(buf, "Proxyscn: %6u known clean hosts",cleancount());
 809   triggerhook(HOOK_CORE_STATSREPLY,buf);
 810 }
 811
 812 void sendlagwarning() {
 813   int i,j;
 814   nick *np;
 815
 816   for (i=0;i<MAXSERVERS;i++) {
 817     if (serverlist[i].maxusernum>0) {
 818       for(j=0;j<serverlist[i].maxusernum;j++) {
 819         np=servernicks[i][j];
 820         if (np!=NULL && IsOper(np)) {
 821           sendnoticetouser(proxyscannick,np,"Warning: More than 20,000 hosts to scan - I'm lagging behind badly!");
 822         }
 823       }
 824     }
 825   }
 826 }
 827
 828 int pscansort(const void *a, const void *b) {
 829   int ra = *((const int *)a);
 830   int rb = *((const int *)b);
 831
 832   return thescans[ra].hits - thescans[rb].hits;
 833 }
 834
 835 int proxyscandostatus(void *sender, int cargc, char **cargv) {
 836   nick *np = (nick *) sender;
 837   int i;
 838   int totaldetects=0;
 839   int ord[PSCAN_MAXSCANS];
 840
 841   sendnoticetouser(proxyscannick,np,"Service uptime: %s",longtoduration(time(NULL)-ps_starttime, 1));
 842   sendnoticetouser(proxyscannick,np,"Total scans completed:  %d",scansdone);
 843   sendnoticetouser(proxyscannick,np,"Total hosts glined:     %d",glinedhosts);
 844
 845   sendnoticetouser(proxyscannick,np,"pendingscan structures: %lu x %lu bytes = %lu bytes total",countpendingscan,
 846         sizeof(pendingscan), (countpendingscan * sizeof(pendingscan)));
 847
 848   sendnoticetouser(proxyscannick,np,"Currently active scans: %d/%d",activescans,maxscans);
 849   sendnoticetouser(proxyscannick,np,"Processing speed:       %lu scans per minute",scanspermin);
 850   sendnoticetouser(proxyscannick,np,"Normal queued scans:    %d",normalqueuedscans);
 851   sendnoticetouser(proxyscannick,np,"Timed queued scans:     %d",prioqueuedscans);
 852   sendnoticetouser(proxyscannick,np,"'Clean' cached hosts:   %d",cleancount());
 853   sendnoticetouser(proxyscannick,np,"'Dirty' cached hosts:   %d",dirtycount());
 854
 855   sendnoticetouser(proxyscannick,np,"Extra scans: %d", extrascancount());
 856   for (i=0;i<5;i++)
 857     sendnoticetouser(proxyscannick,np,"Open proxies, class %1d:  %d/%d (%.2f%%)",i,hitsbyclass[i],scansbyclass[i],((float)hitsbyclass[i]*100)/scansbyclass[i]);
 858
 859   for (i=0;i<numscans;i++)
 860     totaldetects+=thescans[i].hits;
 861
 862   for (i=0;i<numscans;i++)
 863     ord[i]=i;
 864
 865   qsort(ord,numscans,sizeof(int),pscansort);
 866
 867   sendnoticetouser(proxyscannick,np,"Scan type Port  Detections");
 868   for (i=0;i<numscans;i++)
 869     sendnoticetouser(proxyscannick,np,"%-9s %-5d %d (%.2f%%)",
 870                      scantostr(thescans[ord[i]].type), thescans[ord[i]].port, thescans[ord[i]].hits, ((float)thescans[ord[i]].hits*100)/totaldetects);
 871
 872   sendnoticetouser(proxyscannick,np,"End of list.");
 873   return CMD_OK;
 874 }
 875
 876 int proxyscandebug(void *sender, int cargc, char **cargv) {
 877   /* Dump all scans.. */
 878   int i;
 879   int activescansfound=0;
 880   int totalscansfound=0;
 881   scan *sp;
 882   nick *np = (nick *)sender;
 883
 884   sendnoticetouser(proxyscannick,np,"Active scans : %d",activescans);
 885
 886   for (i=0;i<SCANHASHSIZE;i++) {
 887     for (sp=scantable[i];sp;sp=sp->next) {
 888       if (sp->outcome==SOUTCOME_INPROGRESS) {
 889         activescansfound++;
 890       }
 891       totalscansfound++;
 892       sendnoticetouser(proxyscannick,np,"fd: %d type: %d port: %d state: %d outcome: %d IP: %s",
 893                        sp->fd,sp->type,sp->port,sp->state,sp->outcome,IPtostr(((patricia_node_t *)sp->node)->prefix->sin));
 894     }
 895   }
 896
 897   sendnoticetouser(proxyscannick,np,"Total %d scans actually found (%d active)",totalscansfound,activescansfound);
 898   return CMD_OK;
 899 }
 900
 901 void proxyscan_onconnect(int hooknum, void *arg) {
 902   ps_ready = 1;
 903
 904   /* kick the queue.. */
 905   startqueuedscans();
 906 }
 907
 908 int proxyscandosave(void *sender, int cargc, char **cargv) {
 909   nick *np = (nick *)sender;
 910
 911   sendnoticetouser(proxyscannick,np,"Saving cached hosts...");
 912   dumpcachehosts(NULL);
 913   sendnoticetouser(proxyscannick,np,"Done.");
 914   return CMD_OK;
 915 }
 916
 917 int proxyscandospew(void *sender, int cargc, char **cargv) {
 918   nick *np = (nick *)sender;
 919
 920   /* check our database for the ip supplied */
 921   unsigned long a,b,c,d;
 922   if (4 != sscanf(cargv[0],"%lu.%lu.%lu.%lu",&a,&b,&c,&d)) {
 923     sendnoticetouser(proxyscannick,np,"Usage: spew x.x.x.x");
 924   } else {
 925     /* check db */
 926     proxyscanspewip(proxyscannick,np,a,b,c,d);
 927   }
 928   return CMD_OK;
 929 }
 930
 931 int proxyscandoshowkill(void *sender, int cargc, char **cargv) {
 932   nick *np = (nick *)sender;
 933
 934   /* check our database for the id supplied */
 935   unsigned long a;
 936   if (1 != sscanf(cargv[0],"%lu",&a)) {
 937     sendnoticetouser(proxyscannick,np,"Usage: showkill <id>");
 938   } else {
 939     /* check db */
 940     proxyscanshowkill(proxyscannick,np,a);
 941   }
 942   return CMD_OK;
 943 }
 944
 945 int proxyscandoscan(void *sender, int cargc, char **cargv) {
 946   nick *np = (nick *)sender;
 947   patricia_node_t *node;
 948   struct irc_in_addr sin;
 949   unsigned char bits;
 950   int i;
 951
 952   if (0 == ipmask_parse(cargv[0],&sin, &bits)) {
 953     sendnoticetouser(proxyscannick,np,"Usage: scan <ip>");
 954   } else {
 955     sendnoticetouser(proxyscannick,np,"Forcing scan of %s",IPtostr(sin));
 956     // * Just queue the scans directly here.. plonk them on the priority queue * /
 957     node = refnode(iptree, &sin, bits); /* node leaks node here - should only allow to scan a nick? */
 958     for(i=0;i<numscans;i++) {
 959       /* @@@TODO: we allow a forced scan to scan the same IP multiple times atm */
 960       queuescan(node,thescans[i].type,thescans[i].port,SCLASS_NORMAL,time(NULL));
 961     }
 962   }
 963   return CMD_OK;
 964 }
 965
 966 int proxyscandoaddscan(void *sender, int cargc, char **cargv) {
 967   nick *np = (nick *)sender;
 968
 969   unsigned int a,b;
 970   if (sscanf(cargv[0],"%u %u",&a,&b) != 2) {
 971     sendnoticetouser(proxyscannick,np,"Usage: addscan <type> <port>");
 972   } else {
 973     sendnoticetouser(proxyscannick,np,"Added scan type %u port %u",a,b);
 974     proxyscan_addscantype(a,b);
 975     scanall(a,b);
 976   }
 977   return CMD_OK;
 978 }
 979
 980 int proxyscandodelscan(void *sender, int cargc, char **cargv) {
 981   nick *np = (nick *)sender;
 982
 983   unsigned int a,b;
 984   if (sscanf(cargv[0],"%u %u",&a,&b) != 2) {
 985     sendnoticetouser(proxyscannick,np,"Usage: delscan <type> <port>");
 986   } else {
 987     sendnoticetouser(proxyscannick,np,"Delete scan type %u port %u",a,b);
 988     proxyscan_delscantype(a,b);
 989   }
 990   return CMD_OK;
 991 }
 992
 993 int proxyscandoshowcommands(void *sender, int cargc, char **cargv) {
 994   nick *np = (nick *)sender;
 995   Command *cmdlist[100];
 996   int i,n;
 997
 998   n=getcommandlist(ps_commands,cmdlist,100);
 999
1000   sendnoticetouser(proxyscannick,np,"The following commands are registered at present:");
1001   for(i=0;i<n;i++) {
1002     sendnoticetouser(proxyscannick,np,"%s",cmdlist[i]->command->content);
1003   }
1004   sendnoticetouser(proxyscannick,np,"End of list.");
1005   return CMD_OK;
1006 }