ircd/ircd_auth.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/ircd_auth.c
   3  * Copyright 2004 Michael Poole <mdpoole@troilus.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 /** @file
  21  * @brief IAuth client implementation for an IRC server.
  22  * @version $Id: ircd_auth.c,v 1.18 2005/07/12 02:58:49 entrope Exp $
  23  */
  24
  25 #include "config.h"
  26 #include "client.h"
  27 #include "ircd_alloc.h"
  28 #include "ircd_auth.h"
  29 #include "ircd_events.h"
  30 #include "ircd_features.h"
  31 #include "ircd_log.h"
  32 #include "ircd_osdep.h"
  33 #include "ircd_snprintf.h"
  34 #include "ircd_string.h"
  35 #include "ircd.h"
  36 #include "msg.h"
  37 #include "msgq.h"
  38 #include "res.h"
  39 #include "s_bsd.h"
  40 #include "s_debug.h"
  41 #include "s_misc.h"
  42 #include "s_user.h"
  43 #include "send.h"
  44
  45 /* #include <assert.h> -- Now using assert in ircd_log.h */
  46 #include <errno.h>
  47 #include <netdb.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <sys/socket.h>
  51 #include <netinet/in.h>
  52 #ifdef HAVE_STDINT_H
  53 #include <stdint.h>
  54 #endif
  55
  56 /** Describes state of a single pending IAuth request. */
  57 struct IAuthRequest {
  58   struct IAuthRequest *iar_prev;        /**< previous request struct */
  59   struct IAuthRequest *iar_next;        /**< next request struct */
  60   struct Client *iar_client;            /**< client being authenticated */
  61   char iar_timed;                       /**< if non-zero, using parent i_request_timer */
  62 };
  63
  64 /** Enumeration of IAuth connection flags. */
  65 enum IAuthFlag
  66 {
  67   IAUTH_BLOCKED,                        /**< socket buffer full */
  68   IAUTH_CONNECTED,                      /**< server greeting/handshake done */
  69   IAUTH_ABORT,                          /**< abort connection asap */
  70   IAUTH_ICLASS,                         /**< tell iauth about all local users */
  71   IAUTH_CLOSING,                        /**< candidate to be disposed */
  72   IAUTH_LAST_FLAG                       /**< total number of flags */
  73 };
  74 /** Declare a bitset structure indexed by IAuthFlag. */
  75 DECLARE_FLAGSET(IAuthFlags, IAUTH_LAST_FLAG);
  76
  77 /** Describes state of an IAuth connection. */
  78 struct IAuth {
  79   struct IAuthRequest i_list_head;      /**< doubly linked list of requests */
  80   struct MsgQ i_sendQ;                  /**< messages queued to send */
  81   struct Socket i_socket;               /**< connection to server */
  82   struct Timer i_reconn_timer;          /**< when to reconnect the connection */
  83   struct Timer i_request_timer;         /**< when the current request times out */
  84   struct IAuthFlags i_flags;            /**< connection state/status/flags */
  85   unsigned int i_recvM;                 /**< messages received */
  86   unsigned int i_sendM;                 /**< messages sent */
  87   unsigned int i_recvK;                 /**< kilobytes received */
  88   unsigned int i_sendK;                 /**< kilobytes sent */
  89   unsigned short i_recvB;               /**< bytes received modulo 1024 */
  90   unsigned short i_sendB;               /**< bytes sent modulo 1024 */
  91   time_t i_reconnect;                   /**< seconds to wait before reconnecting */
  92   time_t i_timeout;                     /**< seconds to wait for a request */
  93   unsigned int i_count;                 /**< characters used in i_buffer */
  94   char i_buffer[BUFSIZE+1];             /**< partial unprocessed line from server */
  95   char i_passwd[PASSWDLEN+1];           /**< password for connection */
  96   char i_host[HOSTLEN+1];               /**< iauth server hostname */
  97   struct irc_sockaddr i_addr;           /**< iauth server ip address and port */
  98   struct IAuth *i_next;                 /**< next connection in list */
  99 };
 100
 101 /** Return flags element of \a iauth. */
 102 #define i_flags(iauth) ((iauth)->i_flags)
 103 /** Return whether flag \a flag is set on \a iauth. */
 104 #define IAuthGet(iauth, flag) FlagHas(&i_flags(iauth), flag)
 105 /** Set flag \a flag on \a iauth. */
 106 #define IAuthSet(iauth, flag) FlagSet(&i_flags(iauth), flag)
 107 /** Clear flag \a flag from \a iauth. */
 108 #define IAuthClr(iauth, flag) FlagClr(&i_flags(iauth), flag)
 109 /** Get blocked state for \a iauth. */
 110 #define i_GetBlocked(iauth) IAuthGet(iauth, IAUTH_BLOCKED)
 111 /** Set blocked state for \a iauth. */
 112 #define i_SetBlocked(iauth) IAuthSet(iauth, IAUTH_BLOCKED)
 113 /** Clear blocked state for \a iauth. */
 114 #define i_ClrBlocked(iauth) IAuthClr(iauth, IAUTH_BLOCKED)
 115 /** Get connected flag for \a iauth. */
 116 #define i_GetConnected(iauth) IAuthGet(iauth, IAUTH_CONNECTED)
 117 /** Set connected flag for \a iauth. */
 118 #define i_SetConnected(iauth) IAuthSet(iauth, IAUTH_CONNECTED)
 119 /** Clear connected flag for \a iauth. */
 120 #define i_ClrConnected(iauth) IAuthClr(iauth, IAUTH_CONNECTED)
 121 /** Get abort flag for \a iauth. */
 122 #define i_GetAbort(iauth) IAuthGet(iauth, IAUTH_ABORT)
 123 /** Set abort flag for \a iauth. */
 124 #define i_SetAbort(iauth) IAuthSet(iauth, IAUTH_ABORT)
 125 /** Clear abort flag for \a iauth. */
 126 #define i_ClrAbort(iauth) IAuthClr(iauth, IAUTH_ABORT)
 127 /** Get IClass flag for \a iauth. */
 128 #define i_GetIClass(iauth) IAuthGet(iauth, IAUTH_ICLASS)
 129 /** Set IClass flag for \a iauth. */
 130 #define i_SetIClass(iauth) IAuthSet(iauth, IAUTH_ICLASS)
 131 /** Clear IClass flag for \a iauth. */
 132 #define i_ClrIClass(iauth) IAuthClr(iauth, IAUTH_ICLASS)
 133 /** Get closing flag for \a iauth. */
 134 #define i_GetClosing(iauth) IAuthGet(iauth, IAUTH_CLOSING)
 135 /** Set closing flag for \a iauth. */
 136 #define i_SetClosing(iauth) IAuthSet(iauth, IAUTH_CLOSING)
 137 /** Clear closing flag for \a iauth. */
 138 #define i_ClrClosing(iauth) IAuthClr(iauth, IAUTH_CLOSING)
 139
 140 /** Return head of request linked list for \a iauth. */
 141 #define i_list_head(iauth) ((iauth)->i_list_head)
 142 /** Return socket event generator for \a iauth. */
 143 #define i_socket(iauth) ((iauth)->i_socket)
 144 /** Return reconnect timer for \a iauth. */
 145 #define i_reconn_timer(iauth) ((iauth)->i_reconn_timer)
 146 /** Return request timeout timer for \a iauth. */
 147 #define i_request_timer(iauth) ((iauth)->i_request_timer)
 148 /** Return DNS query for \a iauth. */
 149 #define i_query(iauth) ((iauth)->i_query)
 150 /** Return received bytes (modulo 1024) for \a iauth. */
 151 #define i_recvB(iauth) ((iauth)->i_recvB)
 152 /** Return received kilobytes (modulo 1024) for \a iauth. */
 153 #define i_recvK(iauth) ((iauth)->i_recvK)
 154 /** Return received megabytes for \a iauth. */
 155 #define i_recvM(iauth) ((iauth)->i_recvM)
 156 /** Return sent bytes (modulo 1024) for \a iauth. */
 157 #define i_sendB(iauth) ((iauth)->i_sendB)
 158 /** Return sent kilobytes (modulo 1024) for \a iauth. */
 159 #define i_sendK(iauth) ((iauth)->i_sendK)
 160 /** Return sent megabytes for \a iauth. */
 161 #define i_sendM(iauth) ((iauth)->i_sendM)
 162 /** Return outbound message queue for \a iauth. */
 163 #define i_sendQ(iauth) ((iauth)->i_sendQ)
 164 /** Return reconnection interval for \a iauth. */
 165 #define i_reconnect(iauth) ((iauth)->i_reconnect)
 166 /** Return request timeout interval for \a iauth. */
 167 #define i_timeout(iauth) ((iauth)->i_timeout)
 168 /** Return length of unprocessed message data for \a iauth. */
 169 #define i_count(iauth) ((iauth)->i_count)
 170 /** Return start of unprocessed message data for \a iauth. */
 171 #define i_buffer(iauth) ((iauth)->i_buffer)
 172 /** Return password we send for \a iauth. */
 173 #define i_passwd(iauth) ((iauth)->i_passwd)
 174 /** Return server hostname for \a iauth. */
 175 #define i_host(iauth) ((iauth)->i_host)
 176 /** Return address of IAuth server for \a iauth. */
 177 #define i_addr(iauth) ((iauth)->i_addr)
 178 /** Return server port for \a iauth. */
 179 #define i_port(iauth) ((iauth)->i_addr.port)
 180 /** Return next IAuth connection after \a iauth. */
 181 #define i_next(iauth) ((iauth)->i_next)
 182
 183 /** Command table entry. */
 184 struct IAuthCmd {
 185   const char *iac_name; /**< Name of command. */
 186   void (*iac_func)(struct IAuth *iauth, int, char *[]); /**< Handler function. */
 187 };
 188
 189 /** Active %IAuth connection(s). */
 190 struct IAuth *iauth_active;
 191
 192 static void iauth_write(struct IAuth *iauth);
 193 static void iauth_reconnect(struct IAuth *iauth);
 194 static void iauth_disconnect(struct IAuth *iauth);
 195 static void iauth_sock_callback(struct Event *ev);
 196 static void iauth_send_request(struct IAuth *iauth, struct IAuthRequest *iar);
 197 static void iauth_dispose_request(struct IAuth *iauth, struct IAuthRequest *iar);
 198 static void iauth_cmd_doneauth(struct IAuth *iauth, int argc, char *argv[]);
 199 static void iauth_cmd_badauth(struct IAuth *iauth, int argc, char *argv[]);
 200
 201 /** Table of responses we might get from the IAuth server. */
 202 static const struct IAuthCmd iauth_cmdtab[] = {
 203   { "DoneAuth", iauth_cmd_doneauth },
 204   { "BadAuth", iauth_cmd_badauth },
 205   { NULL, NULL }
 206 };
 207
 208 /** Start (or update) a connection to an %IAuth server.
 209  * If a connection already exists for the specified server name and
 210  * port, update it with the other parameters; otherwise allocate a new
 211  * IAuth record.
 212  * @param[in] host %IAuth server hostname.
 213  * @param[in] port %IAuth server port.
 214  * @param[in] passwd Password to send.
 215  * @param[in] reconnect Reconnect interval.
 216  * @param[in] timeout Request timeout interval.
 217  * @return IAuth structure for that connection.
 218  */
 219 struct IAuth *iauth_connect(char *host, unsigned short port, char *passwd, time_t reconnect, time_t timeout)
 220 {
 221   struct IAuth *iauth;
 222
 223   for (iauth = iauth_active; iauth; iauth = i_next(iauth)) {
 224     if (!ircd_strncmp(i_host(iauth), host, HOSTLEN)
 225         && (i_port(iauth) == port)) {
 226       i_ClrClosing(iauth);
 227       i_reconnect(iauth) = reconnect;
 228       if (t_active(&i_reconn_timer(iauth)) && (t_expire(&i_reconn_timer(iauth)) > CurrentTime + i_reconnect(iauth)))
 229         timer_chg(&i_reconn_timer(iauth), TT_RELATIVE, i_reconnect(iauth));
 230       break;
 231     }
 232   }
 233   if (NULL == iauth) {
 234     if (iauth_active && !i_GetClosing(iauth_active)) {
 235       log_write(LS_CONFIG, L_WARNING, 0, "Creating extra active IAuth connection to %s:%d.", host, port);
 236     }
 237     iauth = MyCalloc(1, sizeof(*iauth));
 238     i_list_head(iauth).iar_prev = &i_list_head(iauth);
 239     i_list_head(iauth).iar_next = &i_list_head(iauth);
 240     msgq_init(&i_sendQ(iauth));
 241     ircd_strncpy(i_host(iauth), host, HOSTLEN);
 242     memset(&i_addr(iauth), 0, sizeof(i_addr(iauth)));
 243     i_port(iauth) = port;
 244     iauth_active = iauth;
 245     timer_init(&i_reconn_timer(iauth));
 246     i_reconnect(iauth) = reconnect;
 247     iauth_reconnect(iauth);
 248   }
 249   if (passwd)
 250     ircd_strncpy(i_passwd(iauth), passwd, PASSWDLEN);
 251   else
 252     i_passwd(iauth)[0] = '\0';
 253   i_timeout(iauth) = timeout;
 254   i_SetIClass(iauth);
 255   return iauth;
 256 }
 257
 258 /** Mark all %IAuth connections as closing. */
 259 void iauth_mark_closing(void)
 260 {
 261   struct IAuth *iauth;
 262   for (iauth = iauth_active; iauth; iauth = i_next(iauth))
 263     i_SetClosing(iauth);
 264 }
 265
 266 /** Close a particular %IAuth connection.
 267  * @param[in] iauth %Connection to close.
 268  */
 269 void iauth_close(struct IAuth *iauth)
 270 {
 271   /* Figure out what to do with the closing connection's requests. */
 272   if (i_list_head(iauth).iar_next != &i_list_head(iauth)) {
 273     struct IAuthRequest *iar;
 274     if (iauth_active || i_next(iauth)) {
 275       /* If iauth_active != NULL, send requests to it; otherwise if
 276        * i_next(iauth) != NULL, we can hope it or some later
 277        * connection will be active.
 278        */
 279       struct IAuth *target = iauth_active ? iauth_active : i_next(iauth);
 280
 281       /* Append iauth->i_list_head to end of target->i_list_head. */
 282       iar = i_list_head(iauth).iar_next;
 283       iar->iar_prev = i_list_head(target).iar_prev;
 284       i_list_head(target).iar_prev->iar_next = iar;
 285       iar = i_list_head(iauth).iar_prev;
 286       iar->iar_next = &i_list_head(target);
 287       i_list_head(target).iar_prev = iar;
 288
 289       /* If the target is not closing, send the requests. */
 290       for (iar = i_list_head(iauth).iar_next;
 291            iar != &i_list_head(target);
 292            iar = iar->iar_next) {
 293         if (!i_GetClosing(target))
 294           iauth_send_request(target, iar);
 295       }
 296     } else {
 297       /* No active connections - approve the requests and drop them. */
 298       while ((iar = i_list_head(iauth).iar_next) != &i_list_head(iauth)) {
 299         struct Client *client = iar->iar_client;
 300         iauth_dispose_request(iauth, iar);
 301         register_user(client, client, cli_name(client), cli_username(client));
 302       }
 303     }
 304   }
 305   /* Make sure the connection closes with an empty request list. */
 306   i_list_head(iauth).iar_prev = &i_list_head(iauth);
 307   i_list_head(iauth).iar_next = &i_list_head(iauth);
 308   /* Cancel the timer, if it is active. */
 309   if (t_active(&i_reconn_timer(iauth)))
 310     timer_del(&i_reconn_timer(iauth));
 311   if (t_active(&i_request_timer(iauth)))
 312     timer_del(&i_request_timer(iauth));
 313   /* Disconnect from the server. */
 314   if (i_GetConnected(iauth))
 315     iauth_disconnect(iauth);
 316   /* Free memory. */
 317   MyFree(iauth);
 318 }
 319
 320 /** Close all %IAuth connections marked as closing. */
 321 void iauth_close_unused(void)
 322 {
 323   struct IAuth *prev, *iauth, *next;
 324
 325   for (prev = NULL, iauth = iauth_active; iauth; iauth = next) {
 326     next = i_next(iauth);
 327     if (i_GetClosing(iauth)) {
 328       /* Update iauth_active linked list. */
 329       if (prev)
 330         i_next(prev) = next;
 331       else
 332         iauth_active = next;
 333       /* Close and destroy the connection. */
 334       iauth_close(iauth);
 335     } else {
 336       prev = iauth;
 337     }
 338   }
 339 }
 340
 341 /** Send a line to an %IAuth server.
 342  * @param[in] iauth %Connection to send on.
 343  * @param[in] format Format string for message.
 344  */
 345 static void iauth_send(struct IAuth *iauth, const char *format, ...)
 346 {
 347   va_list vl;
 348   struct MsgBuf *mb;
 349
 350   va_start(vl, format);
 351   mb = msgq_vmake(0, format, vl);
 352   va_end(vl);
 353   msgq_add(&i_sendQ(iauth), mb, 0);
 354   msgq_clean(mb);
 355 }
 356
 357 /** Report a protocol violation from the %IAuth server.
 358  * @param[in] iauth %Connection that experienced the violation.
 359  * @param[in] format Format string for message to operators.
 360  */
 361 static void iauth_protocol_violation(struct IAuth *iauth, const char *format, ...)
 362 {
 363   struct VarData vd;
 364   assert(iauth != 0);
 365   assert(format != 0);
 366   vd.vd_format = format;
 367   va_start(vd.vd_args, format);
 368   sendto_opmask_butone(NULL, SNO_CONNEXIT, "IAuth protocol violation: %v", &vd);
 369   va_end(vd.vd_args);
 370 }
 371
 372 /** Send on-connect burst to an %IAuth server.
 373  * @param[in] iauth %Connection that has completed.
 374  */
 375 static void iauth_on_connect(struct IAuth *iauth)
 376 {
 377   struct IAuthRequest *iar;
 378   if (EmptyString(i_passwd(iauth)))
 379     iauth_send(iauth, "Server %s", cli_name(&me));
 380   else
 381     iauth_send(iauth, "Server %s %s", cli_name(&me), i_passwd(iauth));
 382   if (i_GetIClass(iauth)) {
 383     /* TODO: report local users to iauth */
 384     iauth_send(iauth, "EndUsers");
 385   }
 386   i_SetConnected(iauth);
 387   for (iar = i_list_head(iauth).iar_next;
 388        iar != &i_list_head(iauth);
 389        iar = iar->iar_next)
 390     iauth_send_request(iauth, iar);
 391   iauth_write(iauth);
 392 }
 393
 394 /** Complete disconnection of an %IAuth connection.
 395  * @param[in] iauth %Connection to fully close.
 396  */
 397 static void iauth_disconnect(struct IAuth *iauth)
 398 {
 399   close(s_fd(&i_socket(iauth)));
 400   socket_del(&i_socket(iauth));
 401   i_ClrConnected(iauth);
 402 }
 403
 404 /** DNS completion callback for an %IAuth connection.
 405  * @param[in] vptr Pointer to the IAuth struct.
 406  * @param[in] he DNS reply parameters.
 407  */
 408 static void iauth_dns_callback(void *vptr, const struct irc_in_addr *addr, const char *h_name)
 409 {
 410   struct IAuth *iauth = vptr;
 411   if (!addr) {
 412     log_write(LS_IAUTH, L_NOTICE, 0, "IAuth connection to %s failed: host lookup failed", i_host(iauth));
 413   } else {
 414     memcpy(&i_addr(iauth).addr, addr, sizeof(i_addr(iauth).addr));
 415     if (!irc_in_addr_valid(&i_addr(iauth).addr)) {
 416       log_write(LS_IAUTH, L_NOTICE, 0, "IAuth connection to %s failed: host came back as unresolved", i_host(iauth));
 417       return;
 418     }
 419     iauth_reconnect(iauth);
 420   }
 421 }
 422
 423 /** Timer callback for reconnecting to %IAuth.
 424  * @param[in] ev Timer event for reconnect.
 425  */
 426 static void iauth_reconnect_ev(struct Event *ev)
 427 {
 428   if (ev_type(ev) == ET_EXPIRE)
 429     iauth_reconnect(t_data(ev_timer(ev)));
 430 }
 431
 432 /** Schedule a reconnection for \a iauth.
 433  * @param[in] iauth %Connection that needs to be reconnected.
 434  */
 435 static void iauth_schedule_reconnect(struct IAuth *iauth)
 436 {
 437   struct Timer *timer;
 438   timer = &i_reconn_timer(iauth);
 439   if (t_onqueue(timer))
 440     timer_chg(timer, TT_RELATIVE, i_reconnect(iauth));
 441   else
 442     timer_add(&i_reconn_timer(iauth), iauth_reconnect_ev,
 443               iauth, TT_RELATIVE, i_reconnect(iauth));
 444 }
 445
 446 /** Initiate a (re-)connection to \a iauth.
 447  * @param[in] iauth %Connection that should be initiated.
 448  */
 449 static void iauth_reconnect(struct IAuth *iauth)
 450 {
 451   struct irc_sockaddr *local;
 452   IOResult result;
 453   int fd;
 454
 455   if (i_GetConnected(iauth)) {
 456     iauth_disconnect(iauth);
 457     iauth_schedule_reconnect(iauth);
 458     return;
 459   }
 460   log_write(LS_IAUTH, L_DEBUG, 0, "IAuth attempt connection to %s port %p.", i_host(iauth), i_port(iauth));
 461   if (!irc_in_addr_valid(&i_addr(iauth).addr)
 462       && !ircd_aton(&i_addr(iauth).addr, i_host(iauth))) {
 463     gethost_byname(i_host(iauth), iauth_dns_callback, iauth);
 464     return;
 465   }
 466   local = irc_in_addr_is_ipv4(&i_addr(iauth).addr) ? &VirtualHost_v4 : &VirtualHost_v6;
 467   fd = os_socket(local, SOCK_STREAM, "IAuth");
 468   if (fd < 0) {
 469     iauth_schedule_reconnect(iauth);
 470     return;
 471   }
 472   if (!os_set_sockbufs(fd, SERVER_TCP_WINDOW, SERVER_TCP_WINDOW)) {
 473     log_write(LS_IAUTH, L_WARNING, 0, "IAuth reconnect unable to set socket buffers: %s", strerror(errno));
 474     goto failure;
 475   }
 476   s_fd(&i_socket(iauth)) = fd;
 477   result = os_connect_nonb(fd, &i_addr(iauth));
 478   if (result == IO_FAILURE) {
 479     log_write(LS_IAUTH, L_NOTICE, 0, "IAuth reconnect unable to initiate connection: %s", strerror(errno));
 480     goto failure;
 481   }
 482   if (!socket_add(&i_socket(iauth), iauth_sock_callback, iauth,
 483                   (result == IO_SUCCESS) ? SS_CONNECTED : SS_CONNECTING,
 484                   SOCK_EVENT_READABLE | SOCK_EVENT_WRITABLE, fd)) {
 485     log_write(LS_IAUTH, L_WARNING, 0, "IAuth reconnect unable to add socket: %s", strerror(errno));
 486     goto failure;
 487   }
 488   return;
 489 failure:
 490   close(fd);
 491   i_ClrConnected(iauth);
 492   iauth_schedule_reconnect(iauth);
 493   return;
 494 }
 495
 496 /** Read input from \a iauth.
 497  * Reads up to SERVER_TCP_WINDOW bytes per pass.
 498  * @param[in] iauth Readable connection.
 499  */
 500 static void iauth_read(struct IAuth *iauth)
 501 {
 502   char *src, *endp, *old_buffer, *argv[MAXPARA + 1];
 503   unsigned int length, argc, ii;
 504   char readbuf[SERVER_TCP_WINDOW];
 505
 506   length = 0;
 507   if (IO_FAILURE == os_recv_nonb(s_fd(&i_socket(iauth)), readbuf, sizeof(readbuf), &length)
 508       || length == 0) {
 509       iauth_reconnect(iauth);
 510       return;
 511   }
 512   i_recvB(iauth) += length;
 513   if (i_recvB(iauth) > 1023) {
 514     i_recvK(iauth) += i_recvB(iauth) >> 10;
 515     i_recvB(iauth) &= 1023;
 516   }
 517   old_buffer = i_buffer(iauth);
 518   endp = old_buffer + i_count(iauth);
 519   for (src = readbuf; length > 0; --length) {
 520     *endp = *src++;
 521     if (IsEol(*endp)) {
 522       /* Skip blank lines. */
 523       if (endp == old_buffer)
 524         continue;
 525       /* NUL-terminate line and split parameters. */
 526       *endp = '\0';
 527       for (argc = 0, endp = old_buffer; *endp && (argc < MAXPARA); ) {
 528         while (*endp == ' ')
 529           *endp++ = '\0';
 530         if (*endp == '\0')
 531           break;
 532         if (*endp == ':')
 533         {
 534           argv[argc++] = endp + 1;
 535           break;
 536         }
 537         argv[argc++] = endp;
 538         for (; *endp && *endp != ' '; ++endp) ;
 539       }
 540       argv[argc] = NULL;
 541       /* Count line and reset endp to start of buffer. */
 542       i_recvM(iauth)++;
 543       endp = old_buffer;
 544       /* Look up command and try to dispatch. */
 545       if (argc > 0) {
 546         for (ii = 0; iauth_cmdtab[ii].iac_name; ++ii) {
 547           if (!ircd_strcmp(iauth_cmdtab[ii].iac_name, argv[0])) {
 548             iauth_cmdtab[ii].iac_func(iauth, argc, argv);
 549             if (i_GetAbort(iauth))
 550               iauth_disconnect(iauth);
 551             break;
 552           }
 553         }
 554       }
 555     }
 556     else if (endp < old_buffer + BUFSIZE)
 557       endp++;
 558   }
 559   i_count(iauth) = endp - old_buffer;
 560 }
 561
 562 /** Send queued output to \a iauth.
 563  * @param[in] iauth Writable connection with queued data.
 564  */
 565 static void iauth_write(struct IAuth *iauth)
 566 {
 567   unsigned int bytes_tried, bytes_sent;
 568   IOResult iores;
 569
 570   if (i_GetBlocked(iauth))
 571     return;
 572   while (MsgQLength(&i_sendQ(iauth)) > 0) {
 573     iores = os_sendv_nonb(s_fd(&i_socket(iauth)), &i_sendQ(iauth), &bytes_tried, &bytes_sent);
 574     switch (iores) {
 575     case IO_SUCCESS:
 576       msgq_delete(&i_sendQ(iauth), bytes_sent);
 577       i_sendB(iauth) += bytes_sent;
 578       if (i_sendB(iauth) > 1023) {
 579         i_sendK(iauth) += i_sendB(iauth) >> 10;
 580         i_sendB(iauth) &= 1023;
 581       }
 582       if (bytes_tried == bytes_sent)
 583         break;
 584       /* If bytes_sent < bytes_tried, fall through to IO_BLOCKED. */
 585     case IO_BLOCKED:
 586       i_SetBlocked(iauth);
 587       socket_events(&i_socket(iauth), SOCK_ACTION_ADD | SOCK_EVENT_WRITABLE);
 588       return;
 589     case IO_FAILURE:
 590       iauth_disconnect(iauth);
 591       return;
 592     }
 593   }
 594   /* We were able to flush all events, so remove notification. */
 595   socket_events(&i_socket(iauth), SOCK_ACTION_DEL | SOCK_EVENT_WRITABLE);
 596 }
 597
 598 /** Handle socket activity for an %IAuth connection.
 599  * @param[in] ev &Socket event; the IAuth connection is the user data pointer for the socket.
 600  */
 601 static void iauth_sock_callback(struct Event *ev)
 602 {
 603   struct IAuth *iauth;
 604
 605   assert(0 != ev_socket(ev));
 606   iauth = (struct IAuth*) s_data(ev_socket(ev));
 607   assert(0 != iauth);
 608
 609   switch (ev_type(ev)) {
 610   case ET_CONNECT:
 611     socket_state(ev_socket(ev), SS_CONNECTED);
 612     iauth_on_connect(iauth);
 613     break;
 614   case ET_DESTROY:
 615     if (!i_GetClosing(iauth))
 616       iauth_schedule_reconnect(iauth);
 617     break;
 618   case ET_READ:
 619     iauth_read(iauth);
 620     break;
 621   case ET_WRITE:
 622     i_ClrBlocked(iauth);
 623     iauth_write(iauth);
 624     break;
 625   case ET_ERROR:
 626     log_write(LS_IAUTH, L_ERROR, 0, "IAuth socket error: %s", strerror(ev_data(ev)));
 627     /* and fall through to the ET_EOF case */
 628   case ET_EOF:
 629     iauth_disconnect(iauth);
 630     iauth_schedule_reconnect(iauth);
 631     break;
 632   default:
 633     assert(0 && "Unrecognized event type");
 634     break;
 635   }
 636 }
 637
 638 /* Functions related to IAuthRequest structs */
 639
 640 /** Handle timeout while waiting for a response.
 641  * @param[in] ev Timer event that expired.
 642  */
 643 static void iauth_request_ev(struct Event *ev)
 644 {
 645   /* TODO: this could probably be more intelligent */
 646   if (ev_type(ev) == ET_EXPIRE) {
 647     log_write(LS_IAUTH, L_NOTICE, 0, "IAuth request timed out; reconnecting");
 648     iauth_reconnect(t_data(ev_timer(ev)));
 649   }
 650 }
 651
 652 /** Send a authorization request to an %IAuth server.
 653  * @param[in] iauth %Connection to send request on.
 654  * @param[in] iar Request to send.
 655  */
 656 static void iauth_send_request(struct IAuth *iauth, struct IAuthRequest *iar)
 657 {
 658   struct Client *client;
 659
 660   /* If iauth is not connected, we must defer the request. */
 661   if (!i_GetConnected(iauth)) {
 662     Debug((DEBUG_SEND, "IAuth deferring request for %s because we are not connected.", cli_name(iar->iar_client)));
 663     return;
 664   }
 665
 666   /* If no timed request, set up expiration timer. */
 667   if (!t_active(&i_request_timer(iauth))) {
 668     struct Timer *timer = timer_init(&i_request_timer(iauth));
 669     timer_add(timer, iauth_request_ev, iauth, TT_RELATIVE, i_timeout(iauth));
 670     iar->iar_timed = 1;
 671   } else
 672     iar->iar_timed = 0;
 673
 674   /* Send the FullAuth request. */
 675   client = iar->iar_client;
 676   assert(iar->iar_client != NULL);
 677   iauth_send(iauth, "FullAuth %x %s %s %s %s %s :%s",
 678              client, cli_name(client), cli_username(client),
 679              cli_user(client)->host, cli_sock_ip(client),
 680              cli_passwd(client), cli_info(client));
 681
 682   /* Write to the socket if we can. */
 683   iauth_write(iauth);
 684 }
 685
 686 /** Start independent authorization check for a client.
 687  * @param[in] iauth %Connection to send request on.
 688  * @param[in] cptr Client to check.
 689  * @return Zero, or CPTR_KILLED in case of memory allocation failure.
 690  */
 691 int iauth_start_client(struct IAuth *iauth, struct Client *cptr)
 692 {
 693   struct IAuthRequest *iar;
 694
 695   /* Allocate and initialize IAuthRequest struct. */
 696   if (!(iar = MyCalloc(1, sizeof(*iar))))
 697     return exit_client(cptr, cptr, &me, "IAuth memory allocation failed");
 698   cli_iauth(cptr) = iar;
 699   iar->iar_next = &i_list_head(iauth);
 700   iar->iar_prev = i_list_head(iauth).iar_prev;
 701   iar->iar_client = cptr;
 702   iar->iar_prev->iar_next = iar;
 703   iar->iar_next->iar_prev = iar;
 704
 705   /* Send request. */
 706   iauth_send_request(iauth, iar);
 707
 708   return 0;
 709 }
 710
 711 /** Handle a client that is disconnecting.
 712  * If there is a pending %IAuth request for the client, close it.
 713  * @param[in] cptr Client that is disconnecting.
 714  */
 715 void iauth_exit_client(struct Client *cptr)
 716 {
 717   if (cli_iauth(cptr)) {
 718     iauth_dispose_request(iauth_active, cli_iauth(cptr));
 719     cli_iauth(cptr) = NULL;
 720   }
 721   if (iauth_active && i_GetConnected(iauth_active)) {
 722     iauth_send(iauth_active, "ExitUser %x", cptr);
 723     iauth_write(iauth_active);
 724   }
 725 }
 726
 727 /** Find pending request with a particular ID.
 728  * @param[in] iauth %Connection context for the ID.
 729  * @param[in] id Identifier to look up.
 730  * @return IAuthRequest with that ID, or NULL.
 731  */
 732 static struct IAuthRequest *iauth_find_request(struct IAuth *iauth, char *id)
 733 {
 734   struct IAuthRequest *curr;
 735   struct Client *target;
 736   target = (struct Client*)strtoul(id, NULL, 16);
 737   for (curr = i_list_head(iauth).iar_next;
 738        curr != &i_list_head(iauth);
 739        curr = curr->iar_next) {
 740     assert(curr->iar_client != NULL);
 741     if (target == curr->iar_client)
 742       return curr;
 743   }
 744   return NULL;
 745 }
 746
 747 /** Unlink and free a request.
 748  * @param[in] iauth Connection that owns the request.
 749  * @param[in] iar Request to free.
 750  */
 751 static void iauth_dispose_request(struct IAuth *iauth, struct IAuthRequest *iar)
 752 {
 753   assert(iar->iar_client != NULL);
 754   if (iar->iar_timed && t_active(&i_request_timer(iauth)))
 755     timer_del(&i_request_timer(iauth));
 756   cli_iauth(iar->iar_client) = NULL;
 757   iar->iar_prev->iar_next = iar->iar_next;
 758   iar->iar_next->iar_prev = iar->iar_prev;
 759   MyFree(iar);
 760 }
 761
 762 /** Handle a DoneAuth response from %IAuth.
 763  * This means the client is authorized, so let them in.
 764  * @param[in] iauth Connection that sent the message.
 765  * @param[in] argc Argument count.
 766  * @param[in] argv Argument list.
 767  */
 768 static void iauth_cmd_doneauth(struct IAuth *iauth, int argc, char *argv[])
 769 {
 770   struct IAuthRequest *iar;
 771   struct Client *client;
 772   char *id;
 773   char *username;
 774   char *hostname;
 775   char *c_class;
 776   char *account;
 777
 778   if (argc < 5) {
 779     iauth_protocol_violation(iauth, "Only %d parameters for DoneAuth (expected >=5)", argc);
 780     return;
 781   }
 782   id = argv[1];
 783   username = argv[2];
 784   hostname = argv[3];
 785   c_class = argv[4];
 786   account = (argc > 5) ? argv[5] : 0;
 787   iar = iauth_find_request(iauth, id);
 788   if (!iar) {
 789     iauth_protocol_violation(iauth, "Got unexpected DoneAuth for id %s", id);
 790     return;
 791   }
 792   client = iar->iar_client;
 793   ircd_strncpy(cli_username(client), username, USERLEN);
 794   ircd_strncpy(cli_user(client)->host, hostname, HOSTLEN);
 795   if (account) {
 796     ircd_strncpy(cli_user(client)->account, account, ACCOUNTLEN);
 797     SetAccount(client);
 798   }
 799   SetIAuthed(client);
 800   iauth_dispose_request(iauth, iar);
 801   register_user(client, client, cli_name(client), username);
 802 }
 803
 804 /** Handle a BadAuth response from %IAuth.
 805  * This means the client is not authorized, so dump them.
 806  * @param[in] iauth Connection that sent the message.
 807  * @param[in] argc Argument count.
 808  * @param[in] argv Argument list.
 809  */
 810 static void iauth_cmd_badauth(struct IAuth *iauth, int argc, char *argv[])
 811 {
 812   struct IAuthRequest *iar;
 813   struct Client *client;
 814   char *id;
 815   char *reason;
 816
 817   if (argc < 3) {
 818     iauth_protocol_violation(iauth, "Only %d parameters for BadAuth (expected >=3)", argc);
 819     return;
 820   }
 821   id = argv[1];
 822   reason = argv[2];
 823   if (EmptyString(reason)) {
 824     iauth_protocol_violation(iauth, "Empty BadAuth reason for id %s", id);
 825     return;
 826   }
 827   iar = iauth_find_request(iauth, id);
 828   if (!iar) {
 829     iauth_protocol_violation(iauth, "Got unexpected BadAuth for id %s", id);
 830     return;
 831   }
 832   client = iar->iar_client;
 833   iauth_dispose_request(iauth, iar);
 834   exit_client(client, client, &me, reason);
 835 }