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         g_return_if_fail(master!=NULL);
 236
 237         for (;;) {
 238 char packet[0x10000];
 239 ssize_t gotlen;
 240 struct sockaddr_in sockaddr_in_from;
 241 struct client *client;
 242 struct sockaddr_in sockaddr_in_server;
 243 socklen_t sockaddr_in_from_length;
 244 GList *clientl;
 245
 246                 sockaddr_in_from_length=sizeof(sockaddr_in_from);
 247                 if (-1==(gotlen=recvfrom(
 248                                 master->gpollfd.fd,     /* s */
 249                                 packet, /* buf */
 250                                 sizeof(packet), /* len */
 251                                 0,      /* flags */
 252                                 (struct sockaddr *)&sockaddr_in_from,   /* from */
 253                                 &sockaddr_in_from_length)))     /* fromlen */
 254                         break;
 255
 256                 if (sockaddr_in_from_length!=sizeof(sockaddr_in_from))  /* FIXME: errors reporting */
 257                         continue;
 258
 259                 if (packet_recognized(packet,gotlen)) {
 260                         handle_master_probe(packet,gotlen,&sockaddr_in_from);
 261                         continue;
 262                         }
 263
 264                 /* FIXME: Performance: Ugly search... */
 265                 for (clientl=sock_client_list;clientl;clientl=clientl->next) {
 266                         client=clientl->data;
 267                         if (client==master)
 268                                 continue;
 269                         if (1
 270                                         && client->sockaddr_in_from.sin_family     ==sockaddr_in_from.sin_family
 271                                         && client->sockaddr_in_from.sin_port       ==sockaddr_in_from.sin_port
 272                                         && client->sockaddr_in_from.sin_addr.s_addr==sockaddr_in_from.sin_addr.s_addr)
 273                                 break;
 274                         }
 275                 if (!clientl) {
 276                         client=client_new();
 277                         client->sockaddr_in_from=sockaddr_in_from;
 278                         }
 279                 client_touch(client);
 280                 UDPGATE_MEMZERO(&sockaddr_in_server);
 281                 sockaddr_in_server.sin_family=AF_INET;
 282                 sockaddr_in_server.sin_port=htons(SERVER_PORT);
 283                 sockaddr_in_server.sin_addr.s_addr=htonl(SERVER_INADDR);
 284                 /* FIXME: errors checking */
 285                 sendto(
 286                                 client->gpollfd.fd,     /* s */
 287                                 packet, /* msg */
 288                                 gotlen, /* len */
 289                                 0,      /* flags */
 290                                 (struct sockaddr *)&sockaddr_in_server, /* to */
 291                                 sizeof(sockaddr_in_server));    /* tolen */
 292                 }
 293 }
 294
 295 static void handle_probe(struct client *probe)
 296 {
 297         g_return_if_fail(probe!=NULL);
 298
 299         for (;;) {
 300 ssize_t gotlen;
 301 struct sockaddr_in sockaddr_in_from;
 302 char packet[0x10000];
 303 socklen_t sockaddr_in_from_length;
 304
 305                 sockaddr_in_from_length=sizeof(sockaddr_in_from);
 306                 if (-1==(gotlen=recvfrom(
 307                                 master->gpollfd.fd,     /* s */
 308                                 packet, /* buf */
 309                                 sizeof(packet), /* len */
 310                                 0,      /* flags */
 311                                 (struct sockaddr *)&sockaddr_in_from,   /* from */
 312                                 &sockaddr_in_from_length)))     /* fromlen */
 313                         break;
 314                 if (sockaddr_in_from_length!=sizeof(sockaddr_in_from))  /* FIXME: errors reporting */
 315                         continue;
 316
 317                 /* Probe socket should have no response; maybe some ICMP errors - ignored. */
 318                 }
 319 }
 320
 321 static void handle_client(struct client *client)
 322 {
 323         g_return_if_fail(client!=NULL);
 324         g_return_if_fail(master!=NULL);
 325
 326         for (;;) {
 327 ssize_t gotlen;
 328 struct sockaddr_in sockaddr_in_from;
 329 char packet [0x10000];
 330 socklen_t sockaddr_in_from_length;
 331
 332                 sockaddr_in_from_length=sizeof(sockaddr_in_from);
 333                 if (-1==(gotlen=recvfrom(
 334                                 client->gpollfd.fd,     /* s */
 335                                 packet, /* buf */
 336                                 sizeof(packet), /* len */
 337                                 0,      /* flags */
 338                                 (struct sockaddr *)&sockaddr_in_from,   /* from */
 339                                 &sockaddr_in_from_length)))     /* fromlen */
 340                         break;
 341                 if (sockaddr_in_from_length!=sizeof(sockaddr_in_from))  /* FIXME: errors reporting */
 342                         continue;
 343                 client_touch(client);
 344                 /* FIXME: errors checking */
 345                 sendto(
 346                                 master->gpollfd.fd,     /* s */
 347                                 packet, /* msg */
 348                                 gotlen, /* len */
 349                                 0,      /* flags */
 350                                 (struct sockaddr *)&client->sockaddr_in_from,   /* to */
 351                                 sizeof(client->sockaddr_in_from));      /* tolen */
 352                 }
 353 }
 354
 355 static gboolean sock_source_callback(gpointer data /* unused */)
 356 {
 357 GList *clientl;
 358
 359         for (clientl=sock_client_list;clientl;clientl=clientl->next) {
 360 struct client *client=clientl->data;
 361
 362                 if (client->gpollfd.revents&SOCK_SOURCE_CHECK_REVENTS) {
 363                         /**/ if (client==master)
 364                                 handle_master(client);
 365                         else if (client==probe)
 366                                 handle_probe(client);
 367                         else
 368                                 handle_client(client);
 369                         }
 370                 }
 371
 372         return TRUE; /* the source should be kept active */
 373 }
 374
 375 static gboolean sock_source_prepare(GSource *source,gint *timeout)
 376 {
 377         *timeout=-1;
 378
 379         return FALSE;
 380 }
 381
 382 static gboolean sock_source_check(GSource *source)
 383 {
 384 GList *clientl;
 385
 386         for (clientl=sock_client_list;clientl;clientl=clientl->next) {
 387 struct client *client=clientl->data;
 388
 389                 if (client->gpollfd.revents&SOCK_SOURCE_CHECK_REVENTS)
 390                         return TRUE;
 391                 }
 392         return FALSE;
 393 }
 394
 395 static gboolean sock_source_dispatch(GSource *source,GSourceFunc callback,gpointer user_data)
 396 {
 397         g_assert(callback!=NULL);
 398         return (*callback)(user_data);
 399 }
 400
 401 static GSourceFuncs sock_source_watch_funcs={
 402                 sock_source_prepare,
 403                 sock_source_check,
 404                 sock_source_dispatch,
 405                 NULL, /* finalize */
 406                 };
 407
 408 static void sock_gsource_destroy(void)
 409 {
 410         while (sock_client_list)
 411                 client_destroy(sock_client_list->data);
 412
 413         g_assert(master==NULL);
 414
 415         if (sock_gsource) {
 416                 g_source_destroy(sock_gsource);
 417                 sock_gsource=NULL;
 418                 }
 419
 420         write_daemon_running((pid_t)-1);        /* unlink; errors ignored */
 421 }
 422
 423 static gboolean sock_gsource_new(void)
 424 {
 425         if (sock_gsource)
 426                 return TRUE;
 427
 428         g_assert(sock_client_list==NULL);
 429
 430         /* attach sock_source_callback() to watch for any abnormalities
 431          * on our open pipe 'parentheart_fds' and terminate the child if parent dies.
 432          */
 433         if (!(sock_gsource=g_source_new(&sock_source_watch_funcs,sizeof(GSource)))) {
 434                 g_warning("g_source_new(): %m");
 435                 return FALSE;
 436                 }
 437         g_source_set_callback(
 438                         sock_gsource,  /* source */
 439                         sock_source_callback,  /* func */
 440                         NULL, /* data */
 441                         NULL);  /* notify */
 442         if (!g_source_attach(   /* returns 'guint' id */
 443                         sock_gsource,  /* source */
 444                         NULL)) {        /* context; NULL means 'default context' */
 445                 g_warning("g_source_attach(gsource,NULL): %m");
 446                 sock_gsource_destroy();
 447                 return FALSE;
 448                 }
 449         return TRUE;
 450 }
 451
 452 static struct client *client_new(void)
 453 {
 454 struct client *client;
 455 static unsigned long oneul=1;
 456 int sock;
 457
 458         if (!sock_gsource_new())
 459                 return FALSE;
 460
 461         if (-1==(sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP))) {
 462                 g_warning("socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP): %m");
 463                 return NULL;
 464                 }
 465         if (ioctl(sock,FIONBIO,&oneul)) {       /* non-blocking mode */
 466                 g_warning("ioctl(sock,FIONBIO,&1): %m");
 467                 close(sock);    /* errors ignored */
 468                 return NULL;
 469                 }
 470
 471         udpgate_new(client);
 472         client->gpollfd.fd=sock;
 473         client->gpollfd.events=SOCK_SOURCE_CHECK_EVENTS;
 474         client->gpollfd.revents=0;
 475         client->timeout_id=0;
 476         sock_client_list=g_list_prepend(sock_client_list,client);
 477         g_source_add_poll(sock_gsource,&client->gpollfd);
 478
 479         if (optarg_verbose)
 480                 g_message(_("Client fd %d created"),client->gpollfd.fd);
 481
 482         return client;
 483 }
 484
 485 static void client_destroy(struct client *client)
 486 {
 487         g_return_if_fail(client!=NULL);
 488
 489         if (!sock_gsource_new())
 490                 return;
 491
 492         if (optarg_verbose)
 493                 g_message(_("Client fd %d timeout id %d destroy enter"),client->gpollfd.fd,client->timeout_id);
 494
 495         if (client==master) {
 496                 master=NULL;
 497                 g_assert(client->timeout_id==0);
 498                 }
 499         else {
 500                 if (client==probe)
 501                         probe=NULL;
 502                 client_timeout_remove(client);
 503                 }
 504
 505         g_source_remove_poll(sock_gsource,&client->gpollfd);
 506         sock_client_list=g_list_remove(sock_client_list,client);
 507         close(client->gpollfd.fd);      /* errors ignored */
 508
 509         if (optarg_verbose)
 510                 g_message(_("Client fd %d timeout id %d destroy finish"),client->gpollfd.fd,client->timeout_id);
 511
 512         g_free(client);
 513 }
 514
 515 static gboolean probe_send(struct client *probe,gint port_local)
 516 {
 517 struct sockaddr_in sockaddr_in_server;
 518 GHashTable *probe_hash;
 519 gpointer packet;
 520 size_t packet_length;
 521
 522         g_return_val_if_fail(probe!=NULL,FALSE);
 523
 524         probe_unique=g_random_int();
 525
 526         probe_hash=g_hash_table_new(
 527                         g_direct_hash,  /* hash_func */
 528                         g_direct_equal);        /* key_equal_func */
 529         g_hash_table_insert(probe_hash,GUINT_TO_POINTER(PACKET_ELEM_TYPE_CLIENT_PORT) ,GUINT_TO_POINTER(port_local));
 530         g_hash_table_insert(probe_hash,GUINT_TO_POINTER(PACKET_ELEM_TYPE_DATA_GUINT32),GUINT_TO_POINTER(probe_unique));
 531         packet=packet_assembly(&packet_length,probe_hash);
 532         g_hash_table_destroy(probe_hash);
 533         if (!packet)
 534                 return FALSE;
 535
 536         UDPGATE_MEMZERO(&sockaddr_in_server);
 537         sockaddr_in_server.sin_family=AF_INET;
 538         sockaddr_in_server.sin_port=htons(PROBE_PORT);
 539         sockaddr_in_server.sin_addr.s_addr=htonl(PROBE_INADDR);
 540         /* FIXME: errors checking */
 541         sendto(
 542                         probe->gpollfd.fd,      /* s */
 543                         packet, /* msg */
 544                         packet_length,  /* len */
 545                         0,      /* flags */
 546                         (struct sockaddr *)&sockaddr_in_server, /* to */
 547                         sizeof(sockaddr_in_server));    /* tolen */
 548
 549         return TRUE;
 550 }
 551
 552 gboolean network_start(gint port)
 553 {
 554 pid_t daemon_pid;
 555 struct sockaddr_in sockaddr_in;
 556
 557         g_return_val_if_fail(port>=0,FALSE);
 558
 559         if ((pid_t)-1!=(daemon_pid=is_daemon_running())) {
 560                 g_warning(_("Cannot start network daemon: Daemon is already running on PID %d"),(int)daemon_pid);
 561                 return FALSE;
 562                 }
 563
 564         /* Setup 'master': */
 565         g_assert(master==NULL);
 566         if (!(master=client_new()))
 567                 return FALSE;
 568         UDPGATE_MEMZERO(&sockaddr_in);
 569         sockaddr_in.sin_family=AF_INET;
 570         sockaddr_in.sin_port=htons(port);
 571         sockaddr_in.sin_addr.s_addr=htonl(INADDR_ANY);
 572         if (bind(master->gpollfd.fd,(struct sockaddr *)&sockaddr_in,sizeof(sockaddr_in))) {
 573                 g_warning("bind(sock,{AF_INET,INADDR_ANY:%d}): %m",(int)port);
 574 err_sock_gsource_destroy:
 575                 sock_gsource_destroy();
 576                 return FALSE;
 577                 }
 578
 579         /* Setup 'probe': */
 580         if (!(probe=client_new()))
 581                 goto err_sock_gsource_destroy;
 582         probe_send(probe,port);
 583         client_touch(probe);    /* timeout */
 584
 585         write_daemon_running(getpid()); /* errors ignored */
 586         if (network_notify_hostip)
 587                 (*network_notify_hostip)(0);
 588         return TRUE;
 589 }
 590
 591 gboolean optarg_port_set_string(const gchar *port_string)
 592 {
 593 char *endp;
 594 long port_long;
 595
 596         g_return_val_if_fail(port_string!=NULL,FALSE);
 597
 598         port_long=strtol(port_string,&endp,0);
 599         if (endp && *endp) {
 600                 g_warning(_("Invalid port specification, offending string: %s"),endp);
 601                 return FALSE;
 602                 }
 603         if (port_long<1 || port_long>=G_MAXINT || (endp && *endp)) {
 604                 g_warning(_("Invalid port integer number specification (%ld)"),port_long);
 605                 return FALSE;
 606                 }
 607         optarg_port=port_long;
 608         return TRUE;
 609 }
 610
 611 gboolean network_stop(void)
 612 {
 613 pid_t daemon_pid;
 614 int errno_save;
 615
 616         if ((pid_t)-1==(daemon_pid=is_daemon_running())) {
 617                 g_warning(_("Cannot stop network daemon: Daemon is not running"));
 618                 return FALSE;
 619                 }
 620         if (daemon_pid==getpid()) {
 621                 sock_gsource_destroy();
 622                 goto ok;
 623                 }
 624         errno=0;
 625         kill(daemon_pid,SIGKILL);
 626         errno_save=errno;
 627         if (errno_save)  {
 628                 g_warning(udpgate_printf_alloca(_("Unable to stop the daemon at PID %d: %s"),
 629                                 (int)daemon_pid,strerror(errno_save)));
 630                 return FALSE;
 631                 }
 632 ok:
 633         if (network_notify_hostip)
 634                 (*network_notify_hostip)(0);
 635         return TRUE;
 636 }
 637
 638 static GMainLoop *gmainloop;
 639 static void network_detach_network_notify_hostip(guint32 hostip_guint32)
 640 {
 641         if (!hostip_guint32)
 642                 g_main_loop_quit(gmainloop);
 643 }
 644
 645 gboolean network_detach(void)
 646 {
 647 pid_t daemon_pid,forked_pid;
 648
 649         if ((pid_t)-1==(daemon_pid=is_daemon_running()))
 650                 return TRUE;
 651         if (getpid()!=daemon_pid)
 652                 return TRUE;
 653         if (!optarg_no_fork) {
 654                 if ((pid_t)-1==(forked_pid=fork())) {
 655                         g_warning("fork(2): %m");
 656                         return FALSE;
 657                         }
 658                 if (forked_pid) {
 659                         /* parent */
 660                         return TRUE;
 661                         }
 662                 write_daemon_running(getpid()); /* errors ignored */
 663                 optarg_verbose=0;
 664                 close(STDIN_FILENO);
 665                 close(STDOUT_FILENO);
 666                 close(STDERR_FILENO);
 667                 setpgrp();
 668                 setsid();
 669                 }
 670
 671         network_notify_hostip=network_detach_network_notify_hostip;
 672         gmainloop=g_main_loop_new(
 673                         NULL,   /* context */
 674                         TRUE);  /* is_running; ignored */
 675         g_main_loop_run(gmainloop);     /* loop */
 676         /* Unable to contact the server, aborting. */
 677         return FALSE;
 678 }