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
 283   /* Schedule saves */
 284   schedulerecurring(time(NULL)+3600,0,3600,&dumpcachehosts,NULL);
 285
 286   ps_logfile=fopen("logs/proxyscan.log","a");
 287
 288   if (connected) {
 289     /* if we're already connected, assume we're just reloading module (i.e. have a completed burst) */
 290     ps_ready = 1;
 291     startqueuedscans();
 292   }
 293 }
 294
 295 void registerproxyscannick(void *arg) {
 296   sstring *psnick,*psuser,*pshost,*psrealname;
 297   /* Set up our nick on the network */
 298   channel *cp;
 299
 300   psnick=getcopyconfigitem("proxyscan","nick","P",NICKLEN);
 301   psuser=getcopyconfigitem("proxyscan","user","proxyscan",USERLEN);
 302   pshost=getcopyconfigitem("proxyscan","host","some.host",HOSTLEN);
 303   psrealname=getcopyconfigitem("proxyscan","realname","Proxyscan",REALLEN);
 304
 305   proxyscannick=registerlocaluser(psnick->content,psuser->content,pshost->content,
 306                                   psrealname->content,
 307                                   NULL,UMODE_OPER|UMODE_SERVICE|UMODE_DEAF,
 308                                   &proxyscanuserhandler);
 309
 310   freesstring(psnick);
 311   freesstring(psuser);
 312   freesstring(pshost);
 313   freesstring(psrealname);
 314
 315   cp=findchannel("#twilightzone");
 316   if (!cp) {
 317     localcreatechannel(proxyscannick,"#twilightzone");
 318   } else {
 319     localjoinchannel(proxyscannick,cp);
 320     localgetops(proxyscannick,cp);
 321   }
 322 }
 323
 324 void _fini(void) {
 325
 326   deregisterlocaluser(proxyscannick,NULL);
 327
 328   deregisterhook(HOOK_SERVER_END_OF_BURST, &proxyscan_onconnect);
 329
 330   deregisterhook(HOOK_NICK_NEWNICK,&proxyscan_newnick);
 331
 332   deregisterhook(HOOK_CORE_STATSREQUEST,&proxyscanstats);
 333
 334   deleteschedule(NULL,&dumpcachehosts,NULL);
 335
 336   destroycommandtree(ps_commands);
 337
 338   /* Kill any scans in progress */
 339   killallscans();
 340
 341   /* Dump the database - AFTER killallscans() which prunes it */
 342   dumpcachehosts(NULL);
 343
 344   /* dump any cached hosts before deleting the extensions */
 345   releasenodeext(ps_cache_ext);
 346   releasenodeext(ps_extscan_ext);
 347
 348   /* free() all our structures */
 349   nsfreeall(POOL_PROXYSCAN);
 350
 351   freesstring(myipstr);
 352   freesstring(ps_mailname);
 353 #if defined(PROXYSCAN_MAIL)
 354   if (psm_mailerfd!=-1)
 355     deregisterhandler(psm_mailerfd,1);
 356 #endif
 357
 358   if (ps_logfile)
 359     fclose(ps_logfile);
 360 }
 361
 362 void proxyscanuserhandler(nick *target, int message, void **params) {
 363   nick *sender;
 364   Command *ps_command;
 365   char *cargv[20];
 366   int cargc;
 367
 368   switch(message) {
 369   case LU_KILLED:
 370     scheduleoneshot(time(NULL)+1,&registerproxyscannick,NULL);
 371     proxyscannick=NULL;
 372     break;
 373
 374   case LU_PRIVMSG:
 375   case LU_SECUREMSG:
 376     sender=(nick *)params[0];
 377
 378     if (IsOper(sender)) {
 379       cargc = splitline((char *)params[1], cargv, 20, 0);
 380
 381       if ( cargc == 0 )
 382         return;
 383
 384       ps_command = findcommandintree(ps_commands, cargv[0], 1);
 385
 386       if ( !ps_command ) {
 387         sendnoticetouser(proxyscannick,sender, "Unknown command.");
 388         return;
 389       }
 390
 391       if ( ps_command->maxparams < (cargc-1) ) {
 392         rejoinline(cargv[ps_command->maxparams], cargc - (ps_command->maxparams));
 393         cargc = (ps_command->maxparams) + 1;
 394       }
 395
 396       (ps_command->handler)((void *)sender, cargc - 1, &(cargv[1]));
 397       break;
 398     }
 399
 400   default:
 401     break;
 402   }
 403 }
 404
 405 void addscantohash(scan *sp) {
 406   int hash;
 407   hash=(sp->fd)%SCANHASHSIZE;
 408
 409   sp->next=scantable[hash];
 410   scantable[hash]=sp;
 411
 412   activescans++;
 413 }
 414
 415 void delscanfromhash(scan *sp) {
 416   int hash;
 417   scan **sh;
 418
 419   hash=(sp->fd)%SCANHASHSIZE;
 420
 421   for (sh=&(scantable[hash]);*sh;sh=&((*sh)->next)) {
 422     if (*sh==sp) {
 423       (*sh)=sp->next;
 424       break;
 425     }
 426   }
 427
 428   activescans--;
 429 }
 430
 431 scan *findscan(int fd) {
 432   int hash;
 433   scan *sp;
 434
 435   hash=fd%SCANHASHSIZE;
 436
 437   for (sp=scantable[hash];sp;sp=sp->next)
 438     if (sp->fd==fd)
 439       return sp;
 440
 441   return NULL;
 442 }
 443
 444 void startscan(patricia_node_t *node, int type, int port, int class) {
 445   scan *sp;
 446   float scantmp;
 447
 448   if (scansdone>maxscans)
 449   {
 450     /* ignore the first maxscans as this will skew our scans per second! */
 451     tempscanspermin++;
 452     if ((lastscants+60) <= time(NULL))
 453     {
 454       /* ok, at least 60 seconds has passed, calculate the scans per minute figure */
 455       scantmp = time(NULL) - lastscants;
 456       scantmp = tempscanspermin / scantmp;
 457       scantmp = (scantmp * 60);
 458       scanspermin = scantmp;
 459       lastscants = time(NULL);
 460       tempscanspermin = 0;
 461     }
 462   }
 463
 464   sp=getscan();
 465
 466   sp->outcome=SOUTCOME_INPROGRESS;
 467   sp->port=port;
 468   sp->node=node;
 469   sp->type=type;
 470   sp->class=class;
 471   sp->bytesread=0;
 472   sp->totalbytesread=0;
 473   memset(sp->readbuf, '\0', PSCAN_READBUFSIZE);
 474
 475   sp->fd=createconnectsocket(irc_in_addr_v4_to_int(&((patricia_node_t *)sp->node)->prefix->sin),sp->port);
 476   sp->state=SSTATE_CONNECTING;
 477   if (sp->fd<0) {
 478     /* Couldn't set up the socket? */
 479     freescan(sp);
 480     return;
 481   }
 482   /* Wait until it is writeable */
 483   registerhandler(sp->fd,POLLERR|POLLHUP|POLLOUT,&handlescansock);
 484   /* And set a timeout */
 485   sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 486   addscantohash(sp);
 487 }
 488
 489 void timeoutscansock(void *arg) {
 490   scan *sp=(scan *)arg;
 491
 492   killsock(sp, SOUTCOME_CLOSED);
 493 }
 494
 495 void killsock(scan *sp, int outcome) {
 496   int i;
 497   cachehost *chp;
 498   foundproxy *fpp;
 499
 500   scansdone++;
 501   scansbyclass[sp->class]++;
 502
 503   /* Remove the socket from the schedule/event lists */
 504   deregisterhandler(sp->fd,1);  /* this will close the fd for us */
 505   deleteschedule(sp->sch,&timeoutscansock,(void *)sp);
 506
 507   sp->outcome=outcome;
 508   delscanfromhash(sp);
 509
 510   /* See if we need to queue another scan.. */
 511   if (sp->outcome==SOUTCOME_CLOSED &&
 512       ((sp->class==SCLASS_CHECK) ||
 513        (sp->class==SCLASS_NORMAL && (sp->state==SSTATE_SENTREQUEST || sp->state==SSTATE_GOTRESPONSE))))
 514     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS2, time(NULL)+300);
 515
 516   if (sp->outcome==SOUTCOME_CLOSED && sp->class==SCLASS_PASS2)
 517     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS3, time(NULL)+300);
 518
 519   if (sp->outcome==SOUTCOME_CLOSED && sp->class==SCLASS_PASS3)
 520     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS4, time(NULL)+300);
 521
 522   if (sp->outcome==SOUTCOME_OPEN) {
 523     hitsbyclass[sp->class]++;
 524
 525     /* Lets try and get the cache record.  If there isn't one, make a new one. */
 526     if (!(chp=findcachehost(sp->node))) {
 527       chp=addcleanhost(time(NULL));
 528       patricia_ref_prefix(sp->node->prefix);
 529       sp->node->exts[ps_cache_ext] = chp;
 530     }
 531     /* Stick it on the cache's list of proxies, if necessary */
 532     for (fpp=chp->proxies;fpp;fpp=fpp->next)
 533       if (fpp->type==sp->type && fpp->port==sp->port)
 534         break;
 535
 536     if (!fpp) {
 537       fpp=getfoundproxy();
 538       fpp->type=sp->type;
 539       fpp->port=sp->port;
 540       fpp->next=chp->proxies;
 541       chp->proxies=fpp;
 542     }
 543
 544     if (!chp->glineid) {
 545       glinedhosts++;
 546       loggline(chp, sp->node);
 547       irc_send("%s GL * +*@%s 1800 %jd :Open Proxy, see http://www.quakenet.org/openproxies.html - ID: %d",
 548                mynumeric->content,IPtostr(((patricia_node_t *)sp->node)->prefix->sin),(intmax_t)getnettime(), chp->glineid);
 549       Error("proxyscan",ERR_DEBUG,"Found open proxy on host %s",IPtostr(((patricia_node_t *)sp->node)->prefix->sin));
 550     } else {
 551       loggline(chp, sp->node);  /* Update log only */
 552     }
 553
 554     /* Update counter */
 555     for(i=0;i<numscans;i++) {
 556       if (thescans[i].type==sp->type && thescans[i].port==sp->port) {
 557         thescans[i].hits++;
 558         break;
 559       }
 560     }
 561   }
 562
 563   freescan(sp);
 564
 565   /* kick the queue.. */
 566   startqueuedscans();
 567 }
 568
 569 void handlescansock(int fd, short events) {
 570   scan *sp;
 571   char buf[512];
 572   int res;
 573   int i;
 574   unsigned long netip;
 575   unsigned short netport;
 576
 577   if ((sp=findscan(fd))==NULL) {
 578     /* Not found; return and hope it goes away */
 579     Error("proxyscan",ERR_ERROR,"Unexpected message from fd %d",fd);
 580     return;
 581   }
 582
 583   /* It woke up, delete the alarm call.. */
 584   deleteschedule(sp->sch,&timeoutscansock,(void *)sp);
 585
 586   if (events & (POLLERR|POLLHUP)) {
 587     /* Some kind of error; give up on this socket */
 588     if (sp->state==SSTATE_GOTRESPONSE) {
 589       /* If the error occured while we were waiting for a response, we might have
 590        * received the "OPEN PROXY!" message and the EOF at the same time, so continue
 591        * processing */
 592 /*      Error("proxyscan",ERR_DEBUG,"Got error in GOTRESPONSE state for %s, continuing.",IPtostr(sp->host->IP)); */
 593     } else {
 594       killsock(sp, SOUTCOME_CLOSED);
 595       return;
 596     }
 597   }
 598
 599   /* Otherwise, we got what we wanted.. */
 600
 601   switch(sp->state) {
 602   case SSTATE_CONNECTING:
 603     /* OK, we got activity while connecting, so we're going to send some
 604      * request depending on scan type.  However, we can reregister everything
 605      * here to save duplicate code: This code is common for all handlers */
 606
 607     /* Delete the old handler */
 608     deregisterhandler(fd,0);
 609     /* Set the new one */
 610     registerhandler(fd,POLLERR|POLLHUP|POLLIN,&handlescansock);
 611     sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 612     /* Update state */
 613     sp->state=SSTATE_SENTREQUEST;
 614
 615     switch(sp->type) {
 616     case STYPE_HTTP:
 617       sprintf(buf,"CONNECT %s:%d HTTP/1.0\r\n\r\n",myipstr->content,listenport);
 618       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 619         /* We didn't write the full amount, DIE */
 620         killsock(sp,SOUTCOME_CLOSED);
 621         return;
 622       }
 623       break;
 624
 625     case STYPE_SOCKS4:
 626       /* set up the buffer */
 627       netip=htonl(myip);
 628       netport=htons(listenport);
 629       memcpy(&buf[4],&netip,4);
 630       memcpy(&buf[2],&netport,2);
 631       buf[0]=4;
 632       buf[1]=1;
 633       buf[8]=0;
 634       if ((write(fd,buf,9))<9) {
 635         /* Didn't write enough, give up */
 636         killsock(sp,SOUTCOME_CLOSED);
 637         return;
 638       }
 639       break;
 640
 641     case STYPE_SOCKS5:
 642       /* Set up initial request buffer */
 643       buf[0]=5;
 644       buf[1]=1;
 645       buf[2]=0;
 646       if ((write(fd,buf,3))>3) {
 647         /* Didn't write enough, give up */
 648         killsock(sp,SOUTCOME_CLOSED);
 649         return;
 650       }
 651
 652       /* Now the actual connect request */
 653       buf[0]=5;
 654       buf[1]=1;
 655       buf[2]=0;
 656       buf[3]=1;
 657       netip=htonl(myip);
 658       netport=htons(listenport);
 659       memcpy(&buf[4],&netip,4);
 660       memcpy(&buf[8],&netport,2);
 661       res=write(fd,buf,10);
 662       if (res<10) {
 663         killsock(sp,SOUTCOME_CLOSED);
 664         return;
 665       }
 666       break;
 667
 668     case STYPE_WINGATE:
 669       /* Send wingate request */
 670       sprintf(buf,"%s:%d\r\n",myipstr->content,listenport);
 671       if((write(fd,buf,strlen(buf)))<strlen(buf)) {
 672         killsock(sp,SOUTCOME_CLOSED);
 673         return;
 674       }
 675       break;
 676
 677     case STYPE_CISCO:
 678       /* Send cisco request */
 679       sprintf(buf,"cisco\r\n");
 680       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 681         killsock(sp, SOUTCOME_CLOSED);
 682         return;
 683       }
 684
 685       sprintf(buf,"telnet %s %d\r\n",myipstr->content,listenport);
 686       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 687         killsock(sp, SOUTCOME_CLOSED);
 688         return;
 689       }
 690
 691       break;
 692
 693     case STYPE_DIRECT:
 694       /* Do nothing */
 695       break;
 696     }
 697     break;
 698
 699   case SSTATE_SENTREQUEST:
 700     res=read(fd, sp->readbuf+sp->bytesread, PSCAN_READBUFSIZE-sp->bytesread);
 701
 702     if (res<=0) {
 703       if ((errno!=EINTR && errno!=EWOULDBLOCK) || res==0) {
 704         /* EOF, forget it */
 705         killsock(sp, SOUTCOME_CLOSED);
 706         return;
 707       }
 708     }
 709
 710     sp->bytesread+=res;
 711     sp->totalbytesread+=res;
 712     for (i=0;i<sp->bytesread - MAGICSTRINGLENGTH;i++) {
 713       if (!strncmp(sp->readbuf+i, MAGICSTRING, MAGICSTRINGLENGTH)) {
 714         /* Found the magic string */
 715         /* If the offset is 0, this means it was the first thing we got from the socket,
 716          * so it's an actual IRCD (sheesh).  Note that when the buffer is full and moved,
 717          * the thing moved to offset 0 would previously have been tested as offset
 718          * PSCAN_READBUFSIZE/2.
 719          *
 720          * Skip this checking for STYPE_DIRECT scans, which are used to detect trojans setting
 721          * up portforwards (which will therefore show up as ircds, we rely on the port being
 722          * strange enough to avoid false positives */
 723         if (i==0 && (sp->type != STYPE_DIRECT)) {
 724           killsock(sp, SOUTCOME_CLOSED);
 725           return;
 726         }
 727
 728         killsock(sp, SOUTCOME_OPEN);
 729         return;
 730       }
 731     }
 732
 733     /* If the buffer is full, move half of it along to make room */
 734     if (sp->bytesread == PSCAN_READBUFSIZE) {
 735       memcpy(sp->readbuf, sp->readbuf + (PSCAN_READBUFSIZE)/2, PSCAN_READBUFSIZE/2);
 736       sp->bytesread = PSCAN_READBUFSIZE/2;
 737     }
 738
 739     /* Don't read data forever.. */
 740     if (sp->totalbytesread > READ_SANITY_LIMIT) {
 741       killsock(sp, SOUTCOME_CLOSED);
 742       return;
 743     }
 744
 745     /* No magic string yet, we schedule another timeout in case it comes later. */
 746     sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 747     return;
 748   }
 749 }
 750
 751 void killallscans() {
 752   int i;
 753   scan *sp;
 754   cachehost *chp;
 755
 756   for(i=0;i<SCANHASHSIZE;i++) {
 757     for(sp=scantable[i];sp;sp=sp->next) {
 758       /* If there is a pending scan, delete it's clean host record.. */
 759       if ((chp=findcachehost(sp->node)) && !chp->proxies) {
 760         sp->node->exts[ps_cache_ext] = NULL;
 761         derefnode(iptree,sp->node);
 762         delcachehost(chp);
 763       }
 764
 765       if (sp->fd!=-1) {
 766         deregisterhandler(sp->fd,1);
 767         deleteschedule(sp->sch,&timeoutscansock,(void *)(sp));
 768       }
 769     }
 770   }
 771 }
 772
 773 void proxyscanstats(int hooknum, void *arg) {
 774   char buf[512];
 775
 776   sprintf(buf, "Proxyscn: %6d/%4d scans complete/in progress.  %d hosts queued.",
 777           scansdone,activescans,queuedhosts);
 778   triggerhook(HOOK_CORE_STATSREPLY,buf);
 779   sprintf(buf, "Proxyscn: %6u known clean hosts",cleancount());
 780   triggerhook(HOOK_CORE_STATSREPLY,buf);
 781 }
 782
 783 void sendlagwarning() {
 784   int i,j;
 785   nick *np;
 786
 787   for (i=0;i<MAXSERVERS;i++) {
 788     if (serverlist[i].maxusernum>0) {
 789       for(j=0;j<serverlist[i].maxusernum;j++) {
 790         np=servernicks[i][j];
 791         if (np!=NULL && IsOper(np)) {
 792           sendnoticetouser(proxyscannick,np,"Warning: More than 20,000 hosts to scan - I'm lagging behind badly!");
 793         }
 794       }
 795     }
 796   }
 797 }
 798
 799 int pscansort(const void *a, const void *b) {
 800   int ra = *((const int *)a);
 801   int rb = *((const int *)b);
 802
 803   return thescans[ra].hits - thescans[rb].hits;
 804 }
 805
 806 int proxyscandostatus(void *sender, int cargc, char **cargv) {
 807   nick *np = (nick *) sender;
 808   int i;
 809   int totaldetects=0;
 810   int ord[PSCAN_MAXSCANS];
 811
 812   sendnoticetouser(proxyscannick,np,"Service uptime: %s",longtoduration(time(NULL)-ps_starttime, 1));
 813   sendnoticetouser(proxyscannick,np,"Total scans completed:  %d",scansdone);
 814   sendnoticetouser(proxyscannick,np,"Total hosts glined:     %d",glinedhosts);
 815
 816   sendnoticetouser(proxyscannick,np,"pendingscan structures: %lu x %lu bytes = %lu bytes total",countpendingscan,
 817         sizeof(pendingscan), (countpendingscan * sizeof(pendingscan)));
 818
 819   sendnoticetouser(proxyscannick,np,"Currently active scans: %d/%d",activescans,maxscans);
 820   sendnoticetouser(proxyscannick,np,"Processing speed:       %lu scans per minute",scanspermin);
 821   sendnoticetouser(proxyscannick,np,"Normal queued scans:    %d",normalqueuedscans);
 822   sendnoticetouser(proxyscannick,np,"Timed queued scans:     %d",prioqueuedscans);
 823   sendnoticetouser(proxyscannick,np,"'Clean' cached hosts:   %d",cleancount());
 824   sendnoticetouser(proxyscannick,np,"'Dirty' cached hosts:   %d",dirtycount());
 825
 826   sendnoticetouser(proxyscannick,np,"Extra scans: %d", extrascancount());
 827   for (i=0;i<5;i++)
 828     sendnoticetouser(proxyscannick,np,"Open proxies, class %1d:  %d/%d (%.2f%%)",i,hitsbyclass[i],scansbyclass[i],((float)hitsbyclass[i]*100)/scansbyclass[i]);
 829
 830   for (i=0;i<numscans;i++)
 831     totaldetects+=thescans[i].hits;
 832
 833   for (i=0;i<numscans;i++)
 834     ord[i]=i;
 835
 836   qsort(ord,numscans,sizeof(int),pscansort);
 837
 838   sendnoticetouser(proxyscannick,np,"Scan type Port  Detections");
 839   for (i=0;i<numscans;i++)
 840     sendnoticetouser(proxyscannick,np,"%-9s %-5d %d (%.2f%%)",
 841                      scantostr(thescans[ord[i]].type), thescans[ord[i]].port, thescans[ord[i]].hits, ((float)thescans[ord[i]].hits*100)/totaldetects);
 842
 843   sendnoticetouser(proxyscannick,np,"End of list.");
 844   return CMD_OK;
 845 }
 846
 847 int proxyscandebug(void *sender, int cargc, char **cargv) {
 848   /* Dump all scans.. */
 849   int i;
 850   int activescansfound=0;
 851   int totalscansfound=0;
 852   scan *sp;
 853   nick *np = (nick *)sender;
 854
 855   sendnoticetouser(proxyscannick,np,"Active scans : %d",activescans);
 856
 857   for (i=0;i<SCANHASHSIZE;i++) {
 858     for (sp=scantable[i];sp;sp=sp->next) {
 859       if (sp->outcome==SOUTCOME_INPROGRESS) {
 860         activescansfound++;
 861       }
 862       totalscansfound++;
 863       sendnoticetouser(proxyscannick,np,"fd: %d type: %d port: %d state: %d outcome: %d IP: %s",
 864                        sp->fd,sp->type,sp->port,sp->state,sp->outcome,IPtostr(((patricia_node_t *)sp->node)->prefix->sin));
 865     }
 866   }
 867
 868   sendnoticetouser(proxyscannick,np,"Total %d scans actually found (%d active)",totalscansfound,activescansfound);
 869   return CMD_OK;
 870 }
 871
 872 void proxyscan_onconnect(int hooknum, void *arg) {
 873   ps_ready = 1;
 874
 875   /* kick the queue.. */
 876   startqueuedscans();
 877 }
 878
 879 int proxyscandosave(void *sender, int cargc, char **cargv) {
 880   nick *np = (nick *)sender;
 881
 882   sendnoticetouser(proxyscannick,np,"Saving cached hosts...");
 883   dumpcachehosts(NULL);
 884   sendnoticetouser(proxyscannick,np,"Done.");
 885   return CMD_OK;
 886 }
 887
 888 int proxyscandospew(void *sender, int cargc, char **cargv) {
 889   nick *np = (nick *)sender;
 890
 891   /* check our database for the ip supplied */
 892   unsigned long a,b,c,d;
 893   if (4 != sscanf(cargv[0],"%lu.%lu.%lu.%lu",&a,&b,&c,&d)) {
 894     sendnoticetouser(proxyscannick,np,"Usage: spew x.x.x.x");
 895   } else {
 896     /* check db */
 897     proxyscanspewip(proxyscannick,np,a,b,c,d);
 898   }
 899   return CMD_OK;
 900 }
 901
 902 int proxyscandoshowkill(void *sender, int cargc, char **cargv) {
 903   nick *np = (nick *)sender;
 904
 905   /* check our database for the id supplied */
 906   unsigned long a;
 907   if (1 != sscanf(cargv[0],"%lu",&a)) {
 908     sendnoticetouser(proxyscannick,np,"Usage: showkill <id>");
 909   } else {
 910     /* check db */
 911     proxyscanshowkill(proxyscannick,np,a);
 912   }
 913   return CMD_OK;
 914 }
 915
 916 int proxyscandoscan(void *sender, int cargc, char **cargv) {
 917   nick *np = (nick *)sender;
 918   patricia_node_t *node;
 919   struct irc_in_addr sin;
 920   unsigned char bits;
 921   int i;
 922
 923   if (0 == ipmask_parse(cargv[0],&sin, &bits)) {
 924     sendnoticetouser(proxyscannick,np,"Usage: scan <ip>");
 925   } else {
 926     sendnoticetouser(proxyscannick,np,"Forcing scan of %s",IPtostr(sin));
 927     // * Just queue the scans directly here.. plonk them on the priority queue * /
 928     node = refnode(iptree, &sin, bits); /* node leaks node here - should only allow to scan a nick? */
 929     for(i=0;i<numscans;i++) {
 930       /* @@@TODO: we allow a forced scan to scan the same IP multiple times atm */
 931       queuescan(node,thescans[i].type,thescans[i].port,SCLASS_NORMAL,time(NULL));
 932     }
 933   }
 934   return CMD_OK;
 935 }
 936
 937 int proxyscandoaddscan(void *sender, int cargc, char **cargv) {
 938   nick *np = (nick *)sender;
 939
 940   unsigned int a,b;
 941   if (sscanf(cargv[0],"%u %u",&a,&b) != 2) {
 942     sendnoticetouser(proxyscannick,np,"Usage: addscan <type> <port>");
 943   } else {
 944     sendnoticetouser(proxyscannick,np,"Added scan type %u port %u",a,b);
 945     proxyscan_addscantype(a,b);
 946     scanall(a,b);
 947   }
 948   return CMD_OK;
 949 }
 950
 951 int proxyscandodelscan(void *sender, int cargc, char **cargv) {
 952   nick *np = (nick *)sender;
 953
 954   unsigned int a,b;
 955   if (sscanf(cargv[0],"%u %u",&a,&b) != 2) {
 956     sendnoticetouser(proxyscannick,np,"Usage: delscan <type> <port>");
 957   } else {
 958     sendnoticetouser(proxyscannick,np,"Delete scan type %u port %u",a,b);
 959     proxyscan_delscantype(a,b);
 960   }
 961   return CMD_OK;
 962 }
 963
 964 int proxyscandoshowcommands(void *sender, int cargc, char **cargv) {
 965   nick *np = (nick *)sender;
 966   Command *cmdlist[100];
 967   int i,n;
 968
 969   n=getcommandlist(ps_commands,cmdlist,100);
 970
 971   sendnoticetouser(proxyscannick,np,"The following commands are registered at present:");
 972   for(i=0;i<n;i++) {
 973     sendnoticetouser(proxyscannick,np,"%s",cmdlist[i]->command->content);
 974   }
 975   sendnoticetouser(proxyscannick,np,"End of list.");
 976   return CMD_OK;
 977 }