src/network.c

   1 /* $Id$
   2  * UDP Gateway utility network layer
   3  * Copyright (C) 2004 Jan Kratochvil <project-udpgate@jankratochvil.net>
   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; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include <glib/gmessages.h>
  23 #include <glib/gmain.h>
  24 #include <sys/socket.h>
  25 #include <netinet/in.h>
  26 #include <glib/glist.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30 #include <signal.h>
  31 #include <errno.h>
  32 #include <glib/giochannel.h>
  33 #include <sys/ioctl.h>
  34 #include <string.h>
  35 #include <glib/galloca.h>
  36 #include <glib/gprintf.h>
  37 #include <glib/grand.h>
  38
  39 #include "network.h"
  40 #include "packet.h"
  41 #include "main.h"       /* for optarg_verbose */
  42
  43
  44 /* Config: */
  45 #define NETWORK_PATHNAME_PID "/var/run/udpgate.pid"
  46 #define SOCK_SOURCE_CHECK_EVENTS (G_IO_IN)      /* |G_IO_PRI */
  47 #define SOCK_SOURCE_CHECK_REVENTS (SOCK_SOURCE_CHECK_EVENTS)    /* |G_IO_ERR|G_IO_HUP|G_IO_NVAL */
  48 #define SERVER_INADDR 0x7F000001
  49 #undef  SERVER_INADDR
  50 #define SERVER_INADDR 0x511F02EA        /* paulina.vellum.cz = 81.31.2.234; host order */
  51 #define SERVER_PORT   9201      /* host order */
  52 #define PROBE_INADDR  SERVER_INADDR     /* host order */
  53 #define PROBE_PORT    8201      /* host order */
  54 #define CLIENT_TIMEOUT_SEC (5*60)
  55 #define PROBE_TIMEOUT_SEC (5)
  56
  57
  58 void (*network_notify_hostip)(guint32 hostip_guint32);
  59
  60
  61 struct client {
  62         GPollFD gpollfd;
  63         struct sockaddr_in sockaddr_in_from;
  64         guint timeout_id;
  65         };
  66
  67 static GSource *sock_gsource;
  68
  69 static GList *sock_client_list; /* of 'struct client *', incl. 'master' and 'probe' */
  70 static struct client *master;   /* no 'timeout' permitted */
  71 static struct client *probe;    /* 'timeout' permitted */
  72 static guint32 probe_unique;
  73
  74 static gboolean write_daemon_running(pid_t pid);
  75
  76 pid_t is_daemon_running(void)
  77 {
  78 FILE *f;
  79 char buf[LINE_MAX],*got;
  80 int pid_int;
  81
  82         if (sock_gsource)
  83                 return getpid();
  84
  85         if (!(f=fopen(NETWORK_PATHNAME_PID,"r")))
  86                 goto err;
  87         got=fgets(buf,sizeof(buf),f);
  88         fclose(f);      /* FIXME: error ignored */
  89         if (got!=buf) {
  90 err_unlink:
  91                 write_daemon_running((pid_t)-1);        /* unlink */
  92 err:
  93                 return (pid_t)-1;
  94                 }
  95         pid_int=atoi(buf);
  96         if (pid_int<=1)
  97                 goto err_unlink;
  98         if (kill((pid_t)pid_int,0)) {
  99                 if (errno==ESRCH)
 100                         goto err_unlink;
 101                 goto err;
 102                 }
 103         return (pid_t)pid_int;
 104 }
 105
 106 static gboolean write_daemon_running(pid_t pid)
 107 {
 108 FILE *f;
 109
 110         if (pid==(pid_t)-1) {
 111                 if (unlink(NETWORK_PATHNAME_PID)) {
 112                         if (errno!=ENOENT)
 113                                 g_warning(_("Error removing PID file \"%s\": %m"),NETWORK_PATHNAME_PID);
 114                         return FALSE;
 115                         }
 116                 return TRUE;
 117                 }
 118         if (!(f=fopen(NETWORK_PATHNAME_PID,"w"))) {
 119                 g_warning(_("Error writing PID %d to \"%s\": %m"),(int)pid,NETWORK_PATHNAME_PID);
 120                 return FALSE;
 121                 }
 122         fprintf(f,"%d\n",(int)pid);     /* errors ignored */
 123         fclose(f);      /* FIXME: error ignored */
 124         return TRUE;
 125 }
 126
 127 static void client_timeout_remove(struct client *client)
 128 {
 129         g_return_if_fail(client!=NULL);
 130         g_return_if_fail(client!=master);
 131
 132         if (client->timeout_id) {
 133 gboolean errgboolean;
 134
 135                 if (optarg_verbose)
 136                         g_message(_("Client fd %d removed timeout id %d"),client->gpollfd.fd,client->timeout_id);
 137                 errgboolean=g_source_remove(client->timeout_id);
 138                 g_assert(errgboolean==TRUE);
 139                 client->timeout_id=0;
 140                 }
 141 }
 142
 143 static gboolean client_touch_timeout(struct client *client);
 144
 145 static void client_touch(struct client *client)
 146 {
 147         g_return_if_fail(client!=NULL);
 148         g_return_if_fail(client!=master);
 149
 150         client_timeout_remove(client);
 151         client->timeout_id=g_timeout_add(
 152                         (client==probe ? PROBE_TIMEOUT_SEC*1000 : CLIENT_TIMEOUT_SEC*1000),     /* interval; msec */
 153                         (GSourceFunc)client_touch_timeout,      /* function */
 154                         client);        /* data */
 155         if (optarg_verbose)
 156                 g_message(_("Client fd %d new timeout id %d"),client->gpollfd.fd,client->timeout_id);
 157         g_assert(client->timeout_id!=0);
 158 }
 159
 160 static void client_destroy(struct client *client);
 161
 162 static gboolean client_touch_timeout(struct client *client)
 163 {
 164         g_return_val_if_fail(client!=NULL,FALSE);       /* FALSE=>should be removed */
 165         g_return_val_if_fail(client!=master,FALSE);     /* FALSE=>should be removed */
 166
 167         if (optarg_verbose)
 168                 g_message(_("Client fd %d timeout id %d occured/entered"),client->gpollfd.fd,client->timeout_id);
 169
 170         /* Do not destroy the timeout in client_destroy().
 171          * It would crash GLib - we remove it be returning FALSE from here.
 172          */
 173         g_assert(client->timeout_id!=0);
 174         client->timeout_id=0;
 175
 176         if (client==probe) {
 177                 network_stop();
 178                 /* Never destroy 'client' now - it has been destroyed by network_stop()! */
 179                 g_warning(_("No probe response from the server, stopping the daemon. Please check your public Internet connectivity."));
 180                 }
 181         else {
 182                 client_destroy(client);
 183                 }
 184
 185         if (optarg_verbose)
 186                 g_message(_("Client timeout occurance finish"));
 187
 188         return FALSE;   /* GSource should be removed */
 189 }
 190
 191 static void handle_master_probe(const void *packet,size_t gotlen,const struct sockaddr_in *sockaddr_in_from)
 192 {
 193 GHashTable *got_hash;
 194 gpointer got_unique_gpointer;
 195 gpointer hostip_gpointer;
 196 guint32 hostip_guint32;
 197
 198         g_return_if_fail(packet!=NULL);
 199         g_return_if_fail(sockaddr_in_from!=NULL);
 200
 201         if (!probe)
 202                 return;
 203
 204         if (!(got_hash=packet_disassembly(packet,gotlen)))
 205                 return;
 206         if (!(g_hash_table_lookup_extended(
 207                         got_hash,       /* hash_table */
 208                         GUINT_TO_POINTER(PACKET_ELEM_TYPE_DATA_GUINT32),        /* lookup_key */
 209                         NULL,   /* orig_key */
 210                         &got_unique_gpointer))) {
 211 err_packet_disassembly_destroy_got_hash:
 212                 packet_disassembly_destroy(got_hash);
 213                 return;
 214                 }
 215         if (GPOINTER_TO_UINT(got_unique_gpointer)!=probe_unique)
 216                 goto err_packet_disassembly_destroy_got_hash;
 217         if (!(g_hash_table_lookup_extended(
 218                         got_hash,       /* hash_table */
 219                         GUINT_TO_POINTER(PACKET_ELEM_TYPE_CLIENT_INADDR),       /* lookup_key */
 220                         NULL,   /* orig_key */
 221                         &hostip_gpointer)))
 222                 goto err_packet_disassembly_destroy_got_hash;
 223         hostip_guint32=GPOINTER_TO_UINT(hostip_gpointer);
 224         packet_disassembly_destroy(got_hash);
 225
 226         client_destroy(probe);
 227         if (network_notify_hostip)
 228                 (*network_notify_hostip)(hostip_guint32);
 229 }
 230
 231 static struct client *client_new(void);
 232
 233 static void handle_master(struct client *master)
 234 {
 235 ssize_t gotlen;
 236 struct sockaddr_in sockaddr_in_from;
 237 char packet[0x10000];
 238 struct client *client;
 239 struct sockaddr_in sockaddr_in_server;
 240 socklen_t sockaddr_in_from_length;
 241
 242         g_return_if_fail(master!=NULL);
 243
 244         sockaddr_in_from_length=sizeof(sockaddr_in_from);
 245         while (-1!=(gotlen=recvfrom(
 246                         master->gpollfd.fd,     /* s */
 247                         packet, /* buf */
 248                         sizeof(packet), /* len */
 249                         0,      /* flags */
 250                         (struct sockaddr *)&sockaddr_in_from,   /* from */
 251                         &sockaddr_in_from_length))) {   /* fromlen */
 252 GList *clientl;
 253
 254                 if (sockaddr_in_from_length!=sizeof(sockaddr_in_from))  /* FIXME: errors reporting */
 255                         continue;
 256
 257                 if (packet_recognized(packet,gotlen)) {
 258                         handle_master_probe(packet,gotlen,&sockaddr_in_from);
 259                         continue;
 260                         }
 261
 262                 /* FIXME: Performance: Ugly search... */
 263                 for (clientl=sock_client_list;clientl;clientl=clientl->next) {
 264                         client=clientl->data;
 265                         if (client==master)
 266                                 continue;
 267                         if (1
 268                                         && client->sockaddr_in_from.sin_family     ==sockaddr_in_from.sin_family
 269                                         && client->sockaddr_in_from.sin_port       ==sockaddr_in_from.sin_port
 270                                         && client->sockaddr_in_from.sin_addr.s_addr==sockaddr_in_from.sin_addr.s_addr)
 271                                 break;
 272                         }
 273                 if (!clientl) {
 274                         client=client_new();
 275                         client->sockaddr_in_from=sockaddr_in_from;
 276                         }
 277                 client_touch(client);
 278                 UDPGATE_MEMZERO(&sockaddr_in_server);
 279                 sockaddr_in_server.sin_family=AF_INET;
 280                 sockaddr_in_server.sin_port=htons(SERVER_PORT);
 281                 sockaddr_in_server.sin_addr.s_addr=htonl(SERVER_INADDR);
 282                 /* FIXME: errors checking */
 283                 sendto(
 284                                 client->gpollfd.fd,     /* s */
 285                                 packet, /* msg */
 286                                 gotlen, /* len */
 287                                 0,      /* flags */
 288                                 (struct sockaddr *)&sockaddr_in_server, /* to */
 289                                 sizeof(sockaddr_in_server));    /* tolen */
 290                 }
 291 }
 292
 293 static void handle_probe(struct client *probe)
 294 {
 295 ssize_t gotlen;
 296 struct sockaddr_in sockaddr_in_from;
 297 char packet[0x10000];
 298 socklen_t sockaddr_in_from_length;
 299
 300         g_return_if_fail(probe!=NULL);
 301
 302         sockaddr_in_from_length=sizeof(sockaddr_in_from);
 303         while (-1!=(gotlen=recvfrom(
 304                         master->gpollfd.fd,     /* s */
 305                         packet, /* buf */
 306                         sizeof(packet), /* len */
 307                         0,      /* flags */
 308                         (struct sockaddr *)&sockaddr_in_from,   /* from */
 309                         &sockaddr_in_from_length))) {   /* fromlen */
 310                 if (sockaddr_in_from_length!=sizeof(sockaddr_in_from))  /* FIXME: errors reporting */
 311                         continue;
 312
 313                 /* Probe socket should have no response; maybe some ICMP errors - ignored. */
 314                 }
 315 }
 316
 317 static void handle_client(struct client *client)
 318 {
 319 ssize_t gotlen;
 320 struct sockaddr_in sockaddr_in_from;
 321 char packet [0x10000];
 322 socklen_t sockaddr_in_from_length;
 323
 324         g_return_if_fail(client!=NULL);
 325         g_return_if_fail(master!=NULL);
 326
 327         while (-1!=(gotlen=recvfrom(
 328                         client->gpollfd.fd,     /* s */
 329                         packet, /* buf */
 330                         sizeof(packet), /* len */
 331                         0,      /* flags */
 332                         (struct sockaddr *)&sockaddr_in_from,   /* from */
 333                         &sockaddr_in_from_length))) {   /* fromlen */
 334                 if (sockaddr_in_from_length!=sizeof(sockaddr_in_from))  /* FIXME: errors reporting */
 335                         continue;
 336                 client_touch(client);
 337                 /* FIXME: errors checking */
 338                 sendto(
 339                                 master->gpollfd.fd,     /* s */
 340                                 packet, /* msg */
 341                                 gotlen, /* len */
 342                                 0,      /* flags */
 343                                 (struct sockaddr *)&client->sockaddr_in_from,   /* to */
 344                                 sizeof(client->sockaddr_in_from));      /* tolen */
 345                 }
 346 }
 347
 348 static gboolean sock_source_callback(gpointer data /* unused */)
 349 {
 350 GList *clientl;
 351
 352         for (clientl=sock_client_list;clientl;clientl=clientl->next) {
 353 struct client *client=clientl->data;
 354
 355                 if (client->gpollfd.revents&SOCK_SOURCE_CHECK_REVENTS) {
 356                         /**/ if (client==master)
 357                                 handle_master(client);
 358                         else if (client==probe)
 359                                 handle_probe(client);
 360                         else
 361                                 handle_client(client);
 362                         }
 363                 }
 364
 365         return TRUE; /* the source should be kept active */
 366 }
 367
 368 static gboolean sock_source_prepare(GSource *source,gint *timeout)
 369 {
 370         *timeout=-1;
 371
 372         return FALSE;
 373 }
 374
 375 static gboolean sock_source_check(GSource *source)
 376 {
 377 GList *clientl;
 378
 379         for (clientl=sock_client_list;clientl;clientl=clientl->next) {
 380 struct client *client=clientl->data;
 381
 382                 if (client->gpollfd.revents&SOCK_SOURCE_CHECK_REVENTS)
 383                         return TRUE;
 384                 }
 385         return FALSE;
 386 }
 387
 388 static gboolean sock_source_dispatch(GSource *source,GSourceFunc callback,gpointer user_data)
 389 {
 390         g_assert(callback!=NULL);
 391         return (*callback)(user_data);
 392 }
 393
 394 static GSourceFuncs sock_source_watch_funcs={
 395                 sock_source_prepare,
 396                 sock_source_check,
 397                 sock_source_dispatch,
 398                 NULL, /* finalize */
 399                 };
 400
 401 static void sock_gsource_destroy(void)
 402 {
 403         while (sock_client_list)
 404                 client_destroy(sock_client_list->data);
 405
 406         g_assert(master==NULL);
 407
 408         if (sock_gsource) {
 409                 g_source_destroy(sock_gsource);
 410                 sock_gsource=NULL;
 411                 }
 412
 413         write_daemon_running((pid_t)-1);        /* unlink; errors ignored */
 414 }
 415
 416 static gboolean sock_gsource_new(void)
 417 {
 418         if (sock_gsource)
 419                 return TRUE;
 420
 421         g_assert(sock_client_list==NULL);
 422
 423         /* attach sock_source_callback() to watch for any abnormalities
 424          * on our open pipe 'parentheart_fds' and terminate the child if parent dies.
 425          */
 426         if (!(sock_gsource=g_source_new(&sock_source_watch_funcs,sizeof(GSource)))) {
 427                 g_warning("g_source_new(): %m");
 428                 return FALSE;
 429                 }
 430         g_source_set_callback(
 431                         sock_gsource,  /* source */
 432                         sock_source_callback,  /* func */
 433                         NULL, /* data */
 434                         NULL);  /* notify */
 435         if (!g_source_attach(   /* returns 'guint' id */
 436                         sock_gsource,  /* source */
 437                         NULL)) {        /* context; NULL means 'default context' */
 438                 g_warning("g_source_attach(gsource,NULL): %m");
 439                 sock_gsource_destroy();
 440                 return FALSE;
 441                 }
 442         return TRUE;
 443 }
 444
 445 static struct client *client_new(void)
 446 {
 447 struct client *client;
 448 static unsigned long oneul=1;
 449 int sock;
 450
 451         if (!sock_gsource_new())
 452                 return FALSE;
 453
 454         if (-1==(sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP))) {
 455                 g_warning("socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP): %m");
 456                 return NULL;
 457                 }
 458         if (ioctl(sock,FIONBIO,&oneul)) {       /* non-blocking mode */
 459                 g_warning("ioctl(sock,FIONBIO,&1): %m");
 460                 close(sock);    /* errors ignored */
 461                 return NULL;
 462                 }
 463
 464         udpgate_new(client);
 465         client->gpollfd.fd=sock;
 466         client->gpollfd.events=SOCK_SOURCE_CHECK_EVENTS;
 467         client->gpollfd.revents=0;
 468         client->timeout_id=0;
 469         sock_client_list=g_list_prepend(sock_client_list,client);
 470         g_source_add_poll(sock_gsource,&client->gpollfd);
 471
 472         if (optarg_verbose)
 473                 g_message(_("Client fd %d created"),client->gpollfd.fd);
 474
 475         return client;
 476 }
 477
 478 static void client_destroy(struct client *client)
 479 {
 480         g_return_if_fail(client!=NULL);
 481
 482         if (!sock_gsource_new())
 483                 return;
 484
 485         if (optarg_verbose)
 486                 g_message(_("Client fd %d timeout id %d destroy enter"),client->gpollfd.fd,client->timeout_id);
 487
 488         if (client==master) {
 489                 master=NULL;
 490                 g_assert(client->timeout_id==0);
 491                 }
 492         else {
 493                 if (client==probe)
 494                         probe=NULL;
 495                 client_timeout_remove(client);
 496                 }
 497
 498         g_source_remove_poll(sock_gsource,&client->gpollfd);
 499         sock_client_list=g_list_remove(sock_client_list,client);
 500         close(client->gpollfd.fd);      /* errors ignored */
 501
 502         if (optarg_verbose)
 503                 g_message(_("Client fd %d timeout id %d destroy finish"),client->gpollfd.fd,client->timeout_id);
 504
 505         g_free(client);
 506 }
 507
 508 static gboolean probe_send(struct client *probe,gint port_local)
 509 {
 510 struct sockaddr_in sockaddr_in_server;
 511 GHashTable *probe_hash;
 512 gpointer packet;
 513 size_t packet_length;
 514
 515         g_return_val_if_fail(probe!=NULL,FALSE);
 516
 517         probe_unique=g_random_int();
 518
 519         probe_hash=g_hash_table_new(
 520                         g_direct_hash,  /* hash_func */
 521                         g_direct_equal);        /* key_equal_func */
 522         g_hash_table_insert(probe_hash,GUINT_TO_POINTER(PACKET_ELEM_TYPE_CLIENT_PORT) ,GUINT_TO_POINTER(port_local));
 523         g_hash_table_insert(probe_hash,GUINT_TO_POINTER(PACKET_ELEM_TYPE_DATA_GUINT32),GUINT_TO_POINTER(probe_unique));
 524         packet=packet_assembly(&packet_length,probe_hash);
 525         g_hash_table_destroy(probe_hash);
 526         if (!packet)
 527                 return FALSE;
 528
 529         UDPGATE_MEMZERO(&sockaddr_in_server);
 530         sockaddr_in_server.sin_family=AF_INET;
 531         sockaddr_in_server.sin_port=htons(PROBE_PORT);
 532         sockaddr_in_server.sin_addr.s_addr=htonl(PROBE_INADDR);
 533         /* FIXME: errors checking */
 534         sendto(
 535                         probe->gpollfd.fd,      /* s */
 536                         packet, /* msg */
 537                         packet_length,  /* len */
 538                         0,      /* flags */
 539                         (struct sockaddr *)&sockaddr_in_server, /* to */
 540                         sizeof(sockaddr_in_server));    /* tolen */
 541
 542         return TRUE;
 543 }
 544
 545 gboolean network_start(gint port)
 546 {
 547 pid_t daemon_pid;
 548 struct sockaddr_in sockaddr_in;
 549
 550         g_return_val_if_fail(port>=0,FALSE);
 551
 552         if ((pid_t)-1!=(daemon_pid=is_daemon_running())) {
 553                 g_warning(_("Cannot start network daemon: Daemon is already running on PID %d"),(int)daemon_pid);
 554                 return FALSE;
 555                 }
 556
 557         /* Setup 'master': */
 558         g_assert(master==NULL);
 559         if (!(master=client_new()))
 560                 return FALSE;
 561         UDPGATE_MEMZERO(&sockaddr_in);
 562         sockaddr_in.sin_family=AF_INET;
 563         sockaddr_in.sin_port=htons(port);
 564         sockaddr_in.sin_addr.s_addr=htonl(INADDR_ANY);
 565         if (bind(master->gpollfd.fd,(struct sockaddr *)&sockaddr_in,sizeof(sockaddr_in))) {
 566                 g_warning("bind(sock,{AF_INET,INADDR_ANY:%d}): %m",(int)port);
 567 err_sock_gsource_destroy:
 568                 sock_gsource_destroy();
 569                 return FALSE;
 570                 }
 571
 572         /* Setup 'probe': */
 573         if (!(probe=client_new()))
 574                 goto err_sock_gsource_destroy;
 575         probe_send(probe,port);
 576         client_touch(probe);    /* timeout */
 577
 578         write_daemon_running(getpid()); /* errors ignored */
 579         if (network_notify_hostip)
 580                 (*network_notify_hostip)(0);
 581         return TRUE;
 582 }
 583
 584 gboolean optarg_port_set_string(const gchar *port_string)
 585 {
 586 char *endp;
 587 long port_long;
 588
 589         g_return_val_if_fail(port_string!=NULL,FALSE);
 590
 591         port_long=strtol(port_string,&endp,0);
 592         if (endp && *endp) {
 593                 g_warning(_("Invalid port specification, offending string: %s"),endp);
 594                 return FALSE;
 595                 }
 596         if (port_long<1 || port_long>=G_MAXINT || (endp && *endp)) {
 597                 g_warning(_("Invalid port integer number specification (%ld)"),port_long);
 598                 return FALSE;
 599                 }
 600         optarg_port=port_long;
 601         return TRUE;
 602 }
 603
 604 gboolean network_stop(void)
 605 {
 606 pid_t daemon_pid;
 607 int errno_save;
 608
 609         if ((pid_t)-1==(daemon_pid=is_daemon_running())) {
 610                 g_warning(_("Cannot stop network daemon: Daemon is not running"));
 611                 return FALSE;
 612                 }
 613         if (daemon_pid==getpid()) {
 614                 sock_gsource_destroy();
 615                 goto ok;
 616                 }
 617         errno=0;
 618         kill(daemon_pid,SIGKILL);
 619         errno_save=errno;
 620         if (errno_save)  {
 621                 g_warning(udpgate_printf_alloca(_("Unable to stop the daemon at PID %d: %s"),
 622                                 (int)daemon_pid,strerror(errno_save)));
 623                 return FALSE;
 624                 }
 625 ok:
 626         if (network_notify_hostip)
 627                 (*network_notify_hostip)(0);
 628         return TRUE;
 629 }
 630
 631 static GMainLoop *gmainloop;
 632 static void network_detach_network_notify_hostip(guint32 hostip_guint32)
 633 {
 634         if (!hostip_guint32)
 635                 g_main_loop_quit(gmainloop);
 636 }
 637
 638 gboolean network_detach(void)
 639 {
 640 pid_t daemon_pid,forked_pid;
 641
 642         if ((pid_t)-1==(daemon_pid=is_daemon_running()))
 643                 return TRUE;
 644         if (getpid()!=daemon_pid)
 645                 return TRUE;
 646         if (!optarg_no_fork) {
 647                 if ((pid_t)-1==(forked_pid=fork())) {
 648                         g_warning("fork(2): %m");
 649                         return FALSE;
 650                         }
 651                 if (forked_pid) {
 652                         /* parent */
 653                         return TRUE;
 654                         }
 655                 write_daemon_running(getpid()); /* errors ignored */
 656                 optarg_verbose=0;
 657                 close(STDIN_FILENO);
 658                 close(STDOUT_FILENO);
 659                 close(STDERR_FILENO);
 660                 setpgrp();
 661                 setsid();
 662                 }
 663
 664         network_notify_hostip=network_detach_network_notify_hostip;
 665         gmainloop=g_main_loop_new(
 666                         NULL,   /* context */
 667                         TRUE);  /* is_running; ignored */
 668         g_main_loop_run(gmainloop);     /* loop */
 669         /* Unable to contact the server, aborting. */
 670         return FALSE;
 671 }