/* * strftime.c * * Public-domain implementation of ANSI C library routine. * * It's written in old-style C for maximal portability. * However, since I'm used to prototypes, I've included them too. * * If you want stuff in the System V ascftime routine, add the SYSV_EXT define. * For extensions from SunOS, add SUNOS_EXT. * For stuff needed to implement the P1003.2 date command, add POSIX2_DATE. * For VMS dates, add VMS_EXT. * For a an RFC822 time format, add MAILHEADER_EXT. * For ISO week years, add ISO_DATE_EXT. * For complete POSIX semantics, add POSIX_SEMANTICS. * * The code for %c, %x, and %X now follows the 1003.2 specification for * the POSIX locale. * This version ignores LOCALE information. * It also doesn't worry about multi-byte characters. * So there. * * This file is also shipped with GAWK (GNU Awk), gawk specific bits of * code are included if GAWK is defined. * * Arnold Robbins * January, February, March, 1991 * Updated March, April 1992 * Updated April, 1993 * Updated February, 1994 * Updated May, 1994 * Updated January, 1995 * Updated September, 1995 * Updated January, 1996 * * Fixes from ado@elsie.nci.nih.gov * February 1991, May 1992 * Fixes from Tor Lillqvist tml@tik.vtt.fi * May, 1993 * Further fixes from ado@elsie.nci.nih.gov * February 1994 * %z code from chip@chinacat.unicom.com * Applied September 1995 * %V code fixed (again) and %G, %g added, * January 1996 */ #include "config.h" #ifndef GAWK #include #include #include #include #endif #if defined(TM_IN_SYS_TIME) || !defined(GAWK) && !defined(_WIN32_WCE) #include #include #endif /* defaults: season to taste */ #define SYSV_EXT 1 /* stuff in System V ascftime routine */ #define SUNOS_EXT 1 /* stuff in SunOS strftime routine */ #define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */ #define VMS_EXT 1 /* include %v for VMS date format */ #define MAILHEADER_EXT 1 /* add %z for HHMM format */ #define ISO_DATE_EXT 1 /* %G and %g for year of ISO week */ #ifndef GAWK #define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */ #endif #if defined(ISO_DATE_EXT) #if ! defined(POSIX2_DATE) #define POSIX2_DATE 1 #endif #endif #if defined(POSIX2_DATE) #if ! defined(SYSV_EXT) #define SYSV_EXT 1 #endif #if ! defined(SUNOS_EXT) #define SUNOS_EXT 1 #endif #endif #if defined(POSIX2_DATE) #define adddecl(stuff) stuff #else #define adddecl(stuff) #endif #undef strchr /* avoid AIX weirdness */ #ifndef __STDC__ #define const /**/ extern void tzset(); static int weeknumber(); adddecl(static int iso8601wknum();) #else extern void tzset(void); static int weeknumber(const struct tm *timeptr, int firstweekday); adddecl(static int iso8601wknum(const struct tm *timeptr);) #endif #ifdef STDC_HEADERS #include #include #else extern void *malloc(); extern void *realloc(); extern char *getenv(); extern char *strchr(); #endif #define range(low, item, hi) max(low, min(item, hi)) #if !defined(OS2) && !defined(MSDOS) && defined(HAVE_TZNAME) extern char *tzname[2]; extern int daylight; #ifdef SOLARIS extern long timezone, altzone; #else #ifdef __hpux extern long timezone; #else extern int timezone, altzone; #endif #endif #endif #undef min /* just in case */ /* min --- return minimum of two numbers */ #ifndef __STDC__ static inline int min(a, b) int a, b; #else static inline int min(int a, int b) #endif { return (a < b ? a : b); } #undef max /* also, just in case */ /* max --- return maximum of two numbers */ #ifndef __STDC__ static inline int max(a, b) int a, b; #else static inline int max(int a, int b) #endif { return (a > b ? a : b); } /* strftime --- produce formatted time */ #ifndef __STDC__ size_t strftime(s, maxsize, format, timeptr) char *s; size_t maxsize; const char *format; const struct tm *timeptr; #else size_t strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr) #endif { char *endp = s + maxsize; char *start = s; auto char tbuf[100]; long off; int i, w; long y; static short first = 1; #ifdef POSIX_SEMANTICS static char *savetz = NULL; static int savetzlen = 0; char *tz; #endif /* POSIX_SEMANTICS */ #ifndef HAVE_TM_ZONE #ifndef HAVE_TM_NAME #ifndef HAVE_TZNAME extern char *timezone(); struct timeval tv; struct timezone zone; #else #ifdef __hpux struct timeval tv; struct timezone zone; #endif #endif /* HAVE_TZNAME */ #endif /* HAVE_TM_NAME */ #endif /* HAVE_TM_ZONE */ /* various tables, useful in North America */ static const char *days_a[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", }; static const char *days_l[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", }; static const char *months_a[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", }; static const char *months_l[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December", }; static const char *ampm[] = { "AM", "PM", }; if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0) return 0; /* quick check if we even need to bother */ if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) return 0; #ifndef POSIX_SEMANTICS if (first) { tzset(); first = 0; } #else /* POSIX_SEMANTICS */ tz = getenv("TZ"); if (first) { if (tz != NULL) { int tzlen = strlen(tz); savetz = (char *) malloc(tzlen + 1); if (savetz != NULL) { savetzlen = tzlen + 1; strcpy(savetz, tz); } } tzset(); first = 0; } /* if we have a saved TZ, and it is different, recapture and reset */ if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) { i = strlen(tz) + 1; if (i > savetzlen) { savetz = (char *) realloc(savetz, i); if (savetz) { savetzlen = i; strcpy(savetz, tz); } } else strcpy(savetz, tz); tzset(); } #endif /* POSIX_SEMANTICS */ for (; *format && s < endp - 1; format++) { tbuf[0] = '\0'; if (*format != '%') { *s++ = *format; continue; } again: switch (*++format) { case '\0': *s++ = '%'; goto out; case '%': *s++ = '%'; continue; case 'a': /* abbreviated weekday name */ if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) strcpy(tbuf, "?"); else strcpy(tbuf, days_a[timeptr->tm_wday]); break; case 'A': /* full weekday name */ if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) strcpy(tbuf, "?"); else strcpy(tbuf, days_l[timeptr->tm_wday]); break; #ifdef SYSV_EXT case 'h': /* abbreviated month name */ #endif case 'b': /* abbreviated month name */ if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) strcpy(tbuf, "?"); else strcpy(tbuf, months_a[timeptr->tm_mon]); break; case 'B': /* full month name */ if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) strcpy(tbuf, "?"); else strcpy(tbuf, months_l[timeptr->tm_mon]); break; case 'c': /* appropriate date and time representation */ strftime(tbuf, sizeof tbuf, "%a %b %e %H:%M:%S %Y", timeptr); break; case 'd': /* day of the month, 01 - 31 */ i = range(1, timeptr->tm_mday, 31); sprintf(tbuf, "%02d", i); break; case 'H': /* hour, 24-hour clock, 00 - 23 */ i = range(0, timeptr->tm_hour, 23); sprintf(tbuf, "%02d", i); break; case 'I': /* hour, 12-hour clock, 01 - 12 */ i = range(0, timeptr->tm_hour, 23); if (i == 0) i = 12; else if (i > 12) i -= 12; sprintf(tbuf, "%02d", i); break; case 'j': /* day of the year, 001 - 366 */ sprintf(tbuf, "%03d", timeptr->tm_yday + 1); break; case 'm': /* month, 01 - 12 */ i = range(0, timeptr->tm_mon, 11); sprintf(tbuf, "%02d", i + 1); break; case 'M': /* minute, 00 - 59 */ i = range(0, timeptr->tm_min, 59); sprintf(tbuf, "%02d", i); break; case 'p': /* am or pm based on 12-hour clock */ i = range(0, timeptr->tm_hour, 23); if (i < 12) strcpy(tbuf, ampm[0]); else strcpy(tbuf, ampm[1]); break; case 'S': /* second, 00 - 60 */ i = range(0, timeptr->tm_sec, 60); sprintf(tbuf, "%02d", i); break; case 'U': /* week of year, Sunday is first day of week */ sprintf(tbuf, "%02d", weeknumber(timeptr, 0)); break; case 'w': /* weekday, Sunday == 0, 0 - 6 */ i = range(0, timeptr->tm_wday, 6); sprintf(tbuf, "%d", i); break; case 'W': /* week of year, Monday is first day of week */ sprintf(tbuf, "%02d", weeknumber(timeptr, 1)); break; case 'x': /* appropriate date representation */ strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr); break; case 'X': /* appropriate time representation */ strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr); break; case 'y': /* year without a century, 00 - 99 */ i = timeptr->tm_year % 100; sprintf(tbuf, "%02d", i); break; case 'Y': /* year with century */ sprintf(tbuf, "%ld", 1900L + timeptr->tm_year); break; #ifdef MAILHEADER_EXT /* * From: Chip Rosenthal * Date: Sun, 19 Mar 1995 00:33:29 -0600 (CST) * * Warning: the %z [code] is implemented by inspecting the * timezone name conditional compile settings, and * inferring a method to get timezone offsets. I've tried * this code on a couple of machines, but I don't doubt * there is some system out there that won't like it. * Maybe the easiest thing to do would be to bracket this * with an #ifdef that can turn it off. The %z feature * would be an admittedly obscure one that most folks can * live without, but it would be a great help to those of * us that muck around with various message processors. */ case 'z': /* time zone offset east of GMT e.g. -0600 */ #ifdef HAVE_TM_NAME /* * Systems with tm_name probably have tm_tzadj as * secs west of GMT. Convert to mins east of GMT. */ off = -timeptr->tm_tzadj / 60; #else /* !HAVE_TM_NAME */ #ifdef HAVE_TM_ZONE /* * Systems with tm_zone probably have tm_gmtoff as * secs east of GMT. Convert to mins east of GMT. */ off = timeptr->tm_gmtoff / 60; #else /* !HAVE_TM_ZONE */ #if HAVE_TZNAME /* * Systems with tzname[] probably have timezone as * secs west of GMT. Convert to mins east of GMT. */ #ifdef __hpux gettimeofday(&tv, &zone); off = -zone.tz_minuteswest; #else off = -(daylight ? timezone : altzone) / 60; #endif #else /* !HAVE_TZNAME */ gettimeofday(&tv, &zone); off = -zone.tz_minuteswest; #endif /* !HAVE_TZNAME */ #endif /* !HAVE_TM_ZONE */ #endif /* !HAVE_TM_NAME */ if (off < 0) { tbuf[0] = '-'; off = -off; } else { tbuf[0] = '+'; } sprintf(tbuf+1, "%02d%02d", off/60, off%60); break; #endif /* MAILHEADER_EXT */ case 'Z': /* time zone name or abbrevation */ #ifdef HAVE_TZNAME i = (daylight && timeptr->tm_isdst > 0); /* 0 or 1 */ strcpy(tbuf, tzname[i]); #else #ifdef HAVE_TM_ZONE strcpy(tbuf, timeptr->tm_zone); #else #ifdef HAVE_TM_NAME strcpy(tbuf, timeptr->tm_name); #else gettimeofday(& tv, & zone); #ifdef __CYGWIN__ strcpy(tbuf, timezone()); #else strcpy(tbuf, timezone(zone.tz_minuteswest, timeptr->tm_isdst > 0)); #endif #endif /* HAVE_TM_NAME */ #endif /* HAVE_TM_ZONE */ #endif /* HAVE_TZNAME */ break; #ifdef SYSV_EXT case 'n': /* same as \n */ tbuf[0] = '\n'; tbuf[1] = '\0'; break; case 't': /* same as \t */ tbuf[0] = '\t'; tbuf[1] = '\0'; break; case 'D': /* date as %m/%d/%y */ strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr); break; case 'e': /* day of month, blank padded */ sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31)); break; case 'r': /* time as %I:%M:%S %p */ strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr); break; case 'R': /* time as %H:%M */ strftime(tbuf, sizeof tbuf, "%H:%M", timeptr); break; case 'T': /* time as %H:%M:%S */ strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr); break; #endif #ifdef SUNOS_EXT case 'k': /* hour, 24-hour clock, blank pad */ sprintf(tbuf, "%2d", range(0, timeptr->tm_hour, 23)); break; case 'l': /* hour, 12-hour clock, 1 - 12, blank pad */ i = range(0, timeptr->tm_hour, 23); if (i == 0) i = 12; else if (i > 12) i -= 12; sprintf(tbuf, "%2d", i); break; #endif #ifdef VMS_EXT case 'v': /* date as dd-bbb-YYYY */ sprintf(tbuf, "%2d-%3.3s-%4ld", range(1, timeptr->tm_mday, 31), months_a[range(0, timeptr->tm_mon, 11)], timeptr->tm_year + 1900L); for (i = 3; i < 6; i++) if (islower(tbuf[i])) tbuf[i] = toupper(tbuf[i]); break; #endif #ifdef POSIX2_DATE case 'C': sprintf(tbuf, "%02ld", (timeptr->tm_year + 1900L) / 100); break; case 'E': case 'O': /* POSIX locale extensions, ignored for now */ goto again; case 'V': /* week of year according ISO 8601 */ sprintf(tbuf, "%02d", iso8601wknum(timeptr)); break; case 'u': /* ISO 8601: Weekday as a decimal number [1 (Monday) - 7] */ sprintf(tbuf, "%d", timeptr->tm_wday == 0 ? 7 : timeptr->tm_wday); break; #endif /* POSIX2_DATE */ #ifdef ISO_DATE_EXT case 'G': case 'g': /* * Year of ISO week. * * If it's December but the ISO week number is one, * that week is in next year. * If it's January but the ISO week number is 52 or * 53, that week is in last year. * Otherwise, it's this year. */ w = iso8601wknum(timeptr); if (timeptr->tm_mon == 11 && w == 1) y = 1900L + timeptr->tm_year + 1; else if (timeptr->tm_mon == 0 && w >= 52) y = 1900L + timeptr->tm_year - 1; else y = 1900L + timeptr->tm_year; if (*format == 'G') sprintf(tbuf, "%ld", y); else sprintf(tbuf, "%02ld", y % 100); break; #endif /* ISO_DATE_EXT */ default: tbuf[0] = '%'; tbuf[1] = *format; tbuf[2] = '\0'; break; } i = strlen(tbuf); if (i) { if (s + i < endp - 1) { strcpy(s, tbuf); s += i; } else return 0; } } out: if (s < endp && *format == '\0') { *s = '\0'; return (s - start); } else return 0; } /* isleap --- is a year a leap year? */ #ifndef __STDC__ static int isleap(year) long year; #else static int isleap(long year) #endif { return ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0); } #ifdef POSIX2_DATE /* iso8601wknum --- compute week number according to ISO 8601 */ #ifndef __STDC__ static int iso8601wknum(timeptr) const struct tm *timeptr; #else static int iso8601wknum(const struct tm *timeptr) #endif { /* * From 1003.2: * If the week (Monday to Sunday) containing January 1 * has four or more days in the new year, then it is week 1; * otherwise it is the highest numbered week of the previous * year (52 or 53), and the next week is week 1. * * ADR: This means if Jan 1 was Monday through Thursday, * it was week 1, otherwise week 52 or 53. * * XPG4 erroneously included POSIX.2 rationale text in the * main body of the standard. Thus it requires week 53. */ int weeknum, jan1day, diff; /* get week number, Monday as first day of the week */ weeknum = weeknumber(timeptr, 1); /* * With thanks and tip of the hatlo to tml@tik.vtt.fi * * What day of the week does January 1 fall on? * We know that * (timeptr->tm_yday - jan1.tm_yday) MOD 7 == * (timeptr->tm_wday - jan1.tm_wday) MOD 7 * and that * jan1.tm_yday == 0 * and that * timeptr->tm_wday MOD 7 == timeptr->tm_wday * from which it follows that. . . */ jan1day = timeptr->tm_wday - (timeptr->tm_yday % 7); if (jan1day < 0) jan1day += 7; /* * If Jan 1 was a Monday through Thursday, it was in * week 1. Otherwise it was last year's highest week, which is * this year's week 0. * * What does that mean? * If Jan 1 was Monday, the week number is exactly right, it can * never be 0. * If it was Tuesday through Thursday, the weeknumber is one * less than it should be, so we add one. * Otherwise, Friday, Saturday or Sunday, the week number is * OK, but if it is 0, it needs to be 52 or 53. */ switch (jan1day) { case 1: /* Monday */ break; case 2: /* Tuesday */ case 3: /* Wednesday */ case 4: /* Thursday */ weeknum++; break; case 5: /* Friday */ case 6: /* Saturday */ case 0: /* Sunday */ if (weeknum == 0) { #ifdef USE_BROKEN_XPG4 /* XPG4 (as of March 1994) says 53 unconditionally */ weeknum = 53; #else /* get week number of last week of last year */ struct tm dec31ly; /* 12/31 last year */ dec31ly = *timeptr; dec31ly.tm_year--; dec31ly.tm_mon = 11; dec31ly.tm_mday = 31; dec31ly.tm_wday = (jan1day == 0) ? 6 : jan1day - 1; dec31ly.tm_yday = 364 + isleap(dec31ly.tm_year + 1900L); weeknum = iso8601wknum(& dec31ly); #endif } break; } if (timeptr->tm_mon == 11) { /* * The last week of the year * can be in week 1 of next year. * Sigh. * * This can only happen if * M T W * 29 30 31 * 30 31 * 31 */ int wday, mday; wday = timeptr->tm_wday; mday = timeptr->tm_mday; if ( (wday == 1 && (mday >= 29 && mday <= 31)) || (wday == 2 && (mday == 30 || mday == 31)) || (wday == 3 && mday == 31)) weeknum = 1; } return weeknum; } #endif /* weeknumber --- figure how many weeks into the year */ /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */ #ifndef __STDC__ static int weeknumber(timeptr, firstweekday) const struct tm *timeptr; int firstweekday; #else static int weeknumber(const struct tm *timeptr, int firstweekday) #endif { int wday = timeptr->tm_wday; int ret; if (firstweekday == 1) { if (wday == 0) /* sunday */ wday = 6; else wday--; } ret = ((timeptr->tm_yday + 7 - wday) / 7); if (ret < 0) ret = 0; return ret; } #if 0 /* ADR --- I'm loathe to mess with ado's code ... */ Date: Wed, 24 Apr 91 20:54:08 MDT From: Michal Jaegermann To: arnold@audiofax.com Hi Arnold, in a process of fixing of strftime() in libraries on Atari ST I grabbed some pieces of code from your own strftime. When doing that it came to mind that your weeknumber() function compiles a little bit nicer in the following form: /* * firstweekday is 0 if starting in Sunday, non-zero if in Monday */ { return (timeptr->tm_yday - timeptr->tm_wday + (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7; } How nicer it depends on a compiler, of course, but always a tiny bit. Cheers, Michal ntomczak@vm.ucs.ualberta.ca #endif #ifdef TEST_STRFTIME /* * NAME: * tst * * SYNOPSIS: * tst * * DESCRIPTION: * "tst" is a test driver for the function "strftime". * * OPTIONS: * None. * * AUTHOR: * Karl Vogel * Control Data Systems, Inc. * vogelke@c-17igp.wpafb.af.mil * * BUGS: * None noticed yet. * * COMPILE: * cc -o tst -DTEST_STRFTIME strftime.c */ /* ADR: I reformatted this to my liking, and deleted some unneeded code. */ #ifndef NULL #include #endif #include #include #define MAXTIME 132 /* * Array of time formats. */ static char *array[] = { "(%%A) full weekday name, var length (Sunday..Saturday) %A", "(%%B) full month name, var length (January..December) %B", "(%%C) Century %C", "(%%D) date (%%m/%%d/%%y) %D", "(%%E) Locale extensions (ignored) %E", "(%%H) hour (24-hour clock, 00..23) %H", "(%%I) hour (12-hour clock, 01..12) %I", "(%%M) minute (00..59) %M", "(%%O) Locale extensions (ignored) %O", "(%%R) time, 24-hour (%%H:%%M) %R", "(%%S) second (00..60) %S", "(%%T) time, 24-hour (%%H:%%M:%%S) %T", "(%%U) week of year, Sunday as first day of week (00..53) %U", "(%%V) week of year according to ISO 8601 %V", "(%%W) week of year, Monday as first day of week (00..53) %W", "(%%X) appropriate locale time representation (%H:%M:%S) %X", "(%%Y) year with century (1970...) %Y", "(%%Z) timezone (EDT), or blank if timezone not determinable %Z", "(%%a) locale's abbreviated weekday name (Sun..Sat) %a", "(%%b) locale's abbreviated month name (Jan..Dec) %b", "(%%c) full date (Sat Nov 4 12:02:33 1989)%n%t%t%t %c", "(%%d) day of the month (01..31) %d", "(%%e) day of the month, blank-padded ( 1..31) %e", "(%%h) should be same as (%%b) %h", "(%%j) day of the year (001..366) %j", "(%%k) hour, 24-hour clock, blank pad ( 0..23) %k", "(%%l) hour, 12-hour clock, blank pad ( 0..12) %l", "(%%m) month (01..12) %m", "(%%p) locale's AM or PM based on 12-hour clock %p", "(%%r) time, 12-hour (same as %%I:%%M:%%S %%p) %r", "(%%u) ISO 8601: Weekday as decimal number [1 (Monday) - 7] %u", "(%%v) VMS date (dd-bbb-YYYY) %v", "(%%w) day of week (0..6, Sunday == 0) %w", "(%%x) appropriate locale date representation %x", "(%%y) last two digits of year (00..99) %y", "(%%z) timezone offset east of GMT as HHMM (e.g. -0500) %z", (char *) NULL }; /* main routine. */ int main(argc, argv) int argc; char **argv; { long time(); char *next; char string[MAXTIME]; int k; int length; struct tm *tm; long clock; /* Call the function. */ clock = time((long *) 0); tm = localtime(&clock); for (k = 0; next = array[k]; k++) { length = strftime(string, MAXTIME, next, tm); printf("%s\n", string); } exit(0); } #endif /* TEST_STRFTIME */ d='n532' href='#n532'>532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 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/*
   SSSD

   Service monitor

   Copyright (C) Simo Sorce			2008

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "util/util.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/param.h>
#include <time.h>
#include <string.h>
#ifdef HAVE_SYS_INOTIFY_H
#include <sys/inotify.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

/* Needed for res_init() */
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>

#include "popt.h"
#include "tevent.h"
#include "confdb/confdb.h"
#include "confdb/confdb_setup.h"
#include "collection.h"
#include "ini_config.h"
#include "db/sysdb.h"
#include "monitor/monitor.h"
#include "dbus/dbus.h"
#include "sbus/sssd_dbus.h"
#include "monitor/monitor_interfaces.h"

#ifdef USE_KEYRING
#include <keyutils.h>
#endif

/* ping time cannot be less then once every few seconds or the
 * monitor will get crazy hammering children with messages */
#define MONITOR_DEF_PING_TIME 10

/* Special value to leave the Kerberos Replay Cache set to use
 * the libkrb5 defaults
 */
#define KRB5_RCACHE_DIR_DISABLE "__LIBKRB5_DEFAULTS__"

int cmdline_debug_level;
int cmdline_debug_timestamps;
int cmdline_debug_microseconds;

struct svc_spy;

struct mt_svc {
    struct mt_svc *prev;
    struct mt_svc *next;
    struct sbus_connection *conn;
    struct svc_spy *conn_spy;

    struct mt_ctx *mt_ctx;

    char *provider;
    char *command;
    char *name;
    char *identity;
    pid_t pid;

    int ping_time;

    bool svc_started;

    int restarts;
    time_t last_restart;
    int failed_pongs;
    DBusPendingCall *pending;

    int debug_level;

    struct tevent_timer *ping_ev;
};

struct config_file_callback {
    int wd;
    int retries;
    monitor_reconf_fn fn;
    char *filename;
    time_t modified;
    struct config_file_callback *next;
    struct config_file_callback *prev;
};

struct config_file_ctx {
    TALLOC_CTX *parent_ctx;
    struct tevent_timer *timer;
    bool needs_update;
    struct mt_ctx *mt_ctx;
    struct config_file_callback *callbacks;
};

struct mt_ctx {
    struct tevent_context *ev;
    struct confdb_ctx *cdb;
    TALLOC_CTX *domain_ctx; /* Memory context for domain list */
    struct sss_domain_info *domains;
    TALLOC_CTX *service_ctx; /* Memory context for services */
    char **services;
    struct mt_svc *svc_list;
    struct sbus_connection *sbus_srv;
    struct config_file_ctx *file_ctx;
    int inotify_fd;
    int service_id_timeout;
    bool check_children;
    bool services_started;
    struct netlink_ctx *nlctx;
    const char *conf_path;
};

static int start_service(struct mt_svc *mt_svc);

static int monitor_service_init(struct sbus_connection *conn, void *data);

static int service_send_ping(struct mt_svc *svc);
static int service_signal_reset_offline(struct mt_svc *svc);
static void ping_check(DBusPendingCall *pending, void *data);

static int service_check_alive(struct mt_svc *svc);

static void set_tasks_checker(struct mt_svc *srv);
static void set_global_checker(struct mt_ctx *ctx);
static int monitor_kill_service (struct mt_svc *svc);

static int get_service_config(struct mt_ctx *ctx, const char *name,
                              struct mt_svc **svc_cfg);
static int get_provider_config(struct mt_ctx *ctx, const char *name,
                              struct mt_svc **svc_cfg);
static int add_new_service(struct mt_ctx *ctx, const char *name);
static int add_new_provider(struct mt_ctx *ctx, const char *name);

static int mark_service_as_started(struct mt_svc *svc);

static int monitor_cleanup(void);

static void network_status_change_cb(void *cb_data)
{
    struct mt_svc *iter;
    struct mt_ctx *ctx = (struct mt_ctx *) cb_data;

    DEBUG(SSSDBG_TRACE_INTERNAL, ("A networking status change detected "
          "signaling providers to reset offline status\n"));
    for (iter = ctx->svc_list; iter; iter = iter->next) {
        /* Don't signal services, only providers */
        if (iter->provider) {
            service_signal_reset_offline(iter);
        }
    }
}

/* dbus_get_monitor_version
 * Return the monitor version over D-BUS */
static int get_monitor_version(DBusMessage *message,
                               struct sbus_connection *conn)
{
    dbus_uint16_t version = MONITOR_VERSION;
    DBusMessage *reply;
    dbus_bool_t ret;

    reply = dbus_message_new_method_return(message);
    if (!reply) return ENOMEM;
    ret = dbus_message_append_args(reply,
                                   DBUS_TYPE_UINT16, &version,
                                   DBUS_TYPE_INVALID);
    if (!ret) {
        dbus_message_unref(reply);
        return EIO;
    }

    /* send reply back */
    sbus_conn_send_reply(conn, reply);
    dbus_message_unref(reply);

    return EOK;
}

struct mon_init_conn {
    struct mt_ctx *ctx;
    struct sbus_connection *conn;
    struct tevent_timer *timeout;
};

static int add_svc_conn_spy(struct mt_svc *svc);

/* registers a new client.
 * if operation is successful also sends back the Monitor version */
static int client_registration(DBusMessage *message,
                               struct sbus_connection *conn)
{
    dbus_uint16_t version = MONITOR_VERSION;
    struct mon_init_conn *mini;
    struct mt_svc *svc;
    void *data;
    DBusMessage *reply;
    DBusError dbus_error;
    dbus_uint16_t svc_ver;
    char *svc_name;
    dbus_bool_t dbret;
    int ret;

    data = sbus_conn_get_private_data(conn);
    mini = talloc_get_type(data, struct mon_init_conn);
    if (!mini) {
        DEBUG(0, ("Connection holds no valid init data\n"));
        return EINVAL;
    }

    /* First thing, cancel the timeout */
    talloc_zfree(mini->timeout);

    dbus_error_init(&dbus_error);

    dbret = dbus_message_get_args(message, &dbus_error,
                                  DBUS_TYPE_STRING, &svc_name,
                                  DBUS_TYPE_UINT16, &svc_ver,
                                  DBUS_TYPE_INVALID);
    if (!dbret) {
        DEBUG(1, ("Failed to parse message, killing connection\n"));
        if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
        sbus_disconnect(conn);
        /* FIXME: should we just talloc_zfree(conn) ? */
        goto done;
    }

    DEBUG(4, ("Received ID registration: (%s,%d)\n", svc_name, svc_ver));

    /* search this service in the list */
    svc = mini->ctx->svc_list;
    while (svc) {
        ret = strcasecmp(svc->identity, svc_name);
        if (ret == 0) {
            break;
        }
        svc = svc->next;
    }
    if (!svc) {
        DEBUG(0, ("Unable to find peer [%s] in list of services,"
                  " killing connection!\n", svc_name));
        sbus_disconnect(conn);
        /* FIXME: should we just talloc_zfree(conn) ? */
        goto done;
    }

    /* Fill in svc structure with connection data */
    svc->conn = mini->conn;

    ret = mark_service_as_started(svc);
    if (ret) {
        DEBUG(1, ("Failed to mark service [%s]!\n", svc_name));
        goto done;
    }

    /* reply that all is ok */
    reply = dbus_message_new_method_return(message);
    if (!reply) return ENOMEM;

    dbret = dbus_message_append_args(reply,
                                     DBUS_TYPE_UINT16, &version,
                                     DBUS_TYPE_INVALID);
    if (!dbret) {
        dbus_message_unref(reply);
        return EIO;
    }

    /* send reply back */
    sbus_conn_send_reply(conn, reply);
    dbus_message_unref(reply);

done:
    /* init complete, get rid of temp init context */
    talloc_zfree(mini);

    return EOK;
}

struct svc_spy {
    struct mt_svc *svc;
};

static int svc_destructor(void *mem)
{
    struct mt_svc *svc = talloc_get_type(mem, struct mt_svc);
    if (!svc) {
        /* ?!?!? */
        return 0;
    }

    /* try to delist service */
    if (svc->mt_ctx) {
        DLIST_REMOVE(svc->mt_ctx->svc_list, svc);
    }

    /* Cancel any pending pings */
    if (svc->pending) {
        dbus_pending_call_cancel(svc->pending);
    }

    /* svc is beeing freed, neutralize the spy */
    if (svc->conn_spy) {
        talloc_set_destructor((TALLOC_CTX *)svc->conn_spy, NULL);
        talloc_zfree(svc->conn_spy);
    }
    return 0;
}

static int svc_spy_destructor(void *mem)
{
    struct svc_spy *spy = talloc_get_type(mem, struct svc_spy);
    if (!spy) {
        /* ?!?!? */
        return 0;
    }

    /* svc->conn has been freed, NULL the pointer in svc */
    spy->svc->conn_spy = NULL;
    spy->svc->conn = NULL;
    return 0;
}

static int add_svc_conn_spy(struct mt_svc *svc)
{
    struct svc_spy *spy;

    spy = talloc(svc->conn, struct svc_spy);
    if (!spy) return ENOMEM;

    spy->svc = svc;
    talloc_set_destructor((TALLOC_CTX *)spy, svc_spy_destructor);
    svc->conn_spy = spy;

    return EOK;
}

static int mark_service_as_started(struct mt_svc *svc)
{
    struct mt_ctx *ctx = svc->mt_ctx;
    struct mt_svc *iter;
    int ret;
    int i;

    DEBUG(5, ("Marking %s as started.\n", svc->name));
    svc->svc_started = true;

    /* we need to attach a spy to the connection structure so that if some code
     * frees it we can zero it out in the service structure. Otherwise we may
     * try to access or even free, freed memory. */
    ret = add_svc_conn_spy(svc);
    if (ret) {
        DEBUG(0, ("Failed to attch spy\n"));
        goto done;
    }

    if (!ctx->services_started) {

        /* check if all providers are up */
        for (iter = ctx->svc_list; iter; iter = iter->next) {
            if (iter->provider && !iter->svc_started) {
                DEBUG(5, ("Still waiting on %s provider.\n", iter->name));
                break;
            }
        }

        if (iter) {
            /* there are still unstarted providers */
            goto done;
        }

        ctx->services_started = true;

        DEBUG(4, ("Now starting services!\n"));
        /* then start all services */
        for (i = 0; ctx->services[i]; i++) {
            add_new_service(ctx, ctx->services[i]);
        }
    }

done:
    return ret;
}

static void services_startup_timeout(struct tevent_context *ev,
                                     struct tevent_timer *te,
                                     struct timeval t, void *ptr)
{
    struct mt_ctx *ctx = talloc_get_type(ptr, struct mt_ctx);
    int i;

    DEBUG(6, ("Handling timeout\n"));

    if (!ctx->services_started) {

        DEBUG(1, ("Providers did not start in time, "
                  "forcing services startup!\n"));

        ctx->services_started = true;

        DEBUG(4, ("Now starting services!\n"));
        /* then start all services */
        for (i = 0; ctx->services[i]; i++) {
            add_new_service(ctx, ctx->services[i]);
        }
    }
}

static int add_services_startup_timeout(struct mt_ctx *ctx)
{
    struct tevent_timer *to;
    struct timeval tv;

    /* 5 seconds should be plenty */
    tv = tevent_timeval_current_ofs(5, 0);
    to = tevent_add_timer(ctx->ev, ctx, tv, services_startup_timeout, ctx);
    if (!to) {
        DEBUG(0,("Out of memory?!\n"));
        return ENOMEM;
    }

    return EOK;
}

struct sbus_method monitor_methods[] = {
    { MON_SRV_METHOD_VERSION, get_monitor_version },
    { MON_SRV_METHOD_REGISTER, client_registration },
    { NULL, NULL }
};

struct sbus_interface monitor_server_interface = {
    MON_SRV_INTERFACE,
    MON_SRV_PATH,
    SBUS_DEFAULT_VTABLE,
    monitor_methods,
    NULL
};

/* monitor_dbus_init
 * Set up the monitor service as a D-BUS Server */
static int monitor_dbus_init(struct mt_ctx *ctx)
{
    char *monitor_address;
    int ret;

    ret = monitor_get_sbus_address(ctx, &monitor_address);
    if (ret != EOK) {
        return ret;
    }

    ret = sbus_new_server(ctx, ctx->ev,
                          monitor_address, &monitor_server_interface,
                          false, &ctx->sbus_srv, monitor_service_init, ctx);

    talloc_free(monitor_address);

    return ret;
}

static void svc_try_restart(struct mt_svc *svc, time_t now)
{
    int ret;

    DLIST_REMOVE(svc->mt_ctx->svc_list, svc);
    if (svc->last_restart != 0) {
        if ((now - svc->last_restart) > 30) { /* TODO: get val from config */
            /* it was long ago reset restart threshold */
            svc->restarts = 0;
        }
    }

    /* restart the process */
    if (svc->restarts > 3) { /* TODO: get val from config */
        DEBUG(0, ("Process [%s], definitely stopped!\n", svc->name));
        talloc_free(svc);
        return;
    }

    /* Shut down the current ping timer so it will restart
     * cleanly in start_service()
     */
    talloc_free(svc->ping_ev);

    ret = start_service(svc);
    if (ret != EOK) {
        DEBUG(0,("Failed to restart service '%s'\n", svc->name));
        talloc_free(svc);
        return;
    }

    svc->restarts++;
    svc->last_restart = now;
    return;
}

static void tasks_check_handler(struct tevent_context *ev,
                                struct tevent_timer *te,
                                struct timeval t, void *ptr)
{
    struct mt_svc *svc = talloc_get_type(ptr, struct mt_svc);
    time_t now = time(NULL);
    bool process_alive = true;
    int ret;

    ret = service_check_alive(svc);
    switch (ret) {
    case EOK:
        /* all fine */
        break;

    case ECHILD:
        DEBUG(1,("Process (%s) is stopped!\n", svc->name));
        process_alive = false;
        break;

    default:
        /* TODO: should we tear down it ? */
        DEBUG(1,("Checking for service %s(%d) failed!!\n",
                 svc->name, svc->pid));
        break;
    }

    if (process_alive) {
        ret = service_send_ping(svc);
        switch (ret) {
        case EOK:
            /* all fine */
            break;

        case ENXIO:
            DEBUG(1,("Child (%s) not responding! (yet)\n", svc->name));
            break;

        default:
            /* TODO: should we tear it down ? */
            DEBUG(1,("Sending a message to service (%s) failed!!\n", svc->name));
            break;
        }

        if (svc->failed_pongs >= 3) {
            /* too long since we last heard of this process */
            DEBUG(SSSDBG_CRIT_FAILURE,
                  ("Killing service [%s], not responding to pings!\n",
                   svc->name));
            monitor_kill_service(svc);
            process_alive = false;
        }
    }

    if (!process_alive) {
        svc_try_restart(svc, now);
        return;
    }

    /* all fine, set up the task checker again */
    set_tasks_checker(svc);
}

static void set_tasks_checker(struct mt_svc *svc)
{
    struct tevent_timer *te = NULL;
    struct timeval tv;

    gettimeofday(&tv, NULL);
    tv.tv_sec += svc->ping_time;
    tv.tv_usec = 0;
    te = tevent_add_timer(svc->mt_ctx->ev, svc, tv, tasks_check_handler, svc);
    if (te == NULL) {
        DEBUG(0, ("failed to add event, monitor offline for [%s]!\n",
                  svc->name));
        /* FIXME: shutdown ? */
    }
    svc->ping_ev = te;
}

static void global_checks_handler(struct tevent_context *ev,
                                  struct tevent_timer *te,
                                  struct timeval t, void *ptr)
{
    struct mt_ctx *ctx = talloc_get_type(ptr, struct mt_ctx);
    struct mt_svc *svc;
    int status;
    pid_t pid;

    if (!ctx->check_children) {
        goto done;
    }

    errno = 0;
    pid = waitpid(0, &status, WNOHANG);
    if (pid == 0) {
        goto done;
    }

    if (pid == -1) {
        DEBUG(0, ("waitpid returned -1 (errno:%d[%s])\n",
                  errno, strerror(errno)));
        goto done;
    }

    /* let's see if it is a known service, and try to restart it */
    for (svc = ctx->svc_list; svc; svc = svc->next) {
        if (svc->pid == pid) {
            time_t now = time(NULL);
            DEBUG(1, ("Service [%s] did exit\n", svc->name));
            svc_try_restart(svc, now);
            goto done;
        }
    }
    if (svc == NULL) {
        DEBUG(0, ("Unknown child (%d) did exit\n", pid));
    }

done:
    set_global_checker(ctx);
}

static void set_global_checker(struct mt_ctx *ctx)
{
    struct tevent_timer *te = NULL;
    struct timeval tv;

    gettimeofday(&tv, NULL);
    tv.tv_sec += 1; /* once a second */
    tv.tv_usec = 0;
    te = tevent_add_timer(ctx->ev, ctx, tv, global_checks_handler, ctx);
    if (te == NULL) {
        DEBUG(0, ("failed to add global checker event! PANIC TIME!\n"));
        /* FIXME: is this right ? shoulkd we try to clean up first ?*/
        exit(-1);
    }
}

static int monitor_kill_service (struct mt_svc *svc)
{
    int ret;
    ret = kill(svc->pid, SIGTERM);
    if (ret != EOK) {
        DEBUG(0,("Sending signal to child (%s:%d) failed! "
                 "Ignore and pretend child is dead.\n",
                 svc->name, svc->pid));
    }

    return ret;
}

static void reload_reply(DBusPendingCall *pending, void *data)
{
    DBusMessage *reply;
    struct mt_svc *svc = talloc_get_type(data, struct mt_svc);

    reply = dbus_pending_call_steal_reply(pending);
    if (!reply) {
        /* reply should never be null. This function shouldn't be called
         * until reply is valid or timeout has occurred. If reply is NULL
         * here, something is seriously wrong and we should bail out.
         */
        DEBUG(0, ("A reply callback was called but no reply was received"
                  " and no timeout occurred\n"));
        /* Destroy this connection */
        sbus_disconnect(svc->conn);
        dbus_pending_call_unref(pending);
        return;
    }

    /* TODO: Handle cases where the call has timed out or returned
     * with an error.
     */

    dbus_pending_call_unref(pending);
    dbus_message_unref(reply);
}

static int service_signal_dns_reload(struct mt_svc *svc);
static int monitor_update_resolv(struct config_file_ctx *file_ctx,
                          const char *filename)
{
    int ret;
    struct mt_svc *cur_svc;
    DEBUG(2, ("Resolv.conf has been updated. Reloading.\n"));

    ret = res_init();
    if(ret != 0) {
        return EIO;
    }

    /* Signal all services to reload their DNS configuration */
    for(cur_svc = file_ctx->mt_ctx->svc_list; cur_svc; cur_svc = cur_svc->next) {
        service_signal_dns_reload(cur_svc);
    }
    return EOK;
}

static int service_signal(struct mt_svc *svc, const char *svc_signal)
{
    DBusMessage *msg;
    int ret;

    if (svc->provider && strcasecmp(svc->provider, "local") == 0) {
        /* The local provider requires no signaling */
        return EOK;
    }

    if (!svc->conn) {
        /* Avoid a race condition where we are trying to
         * order a service to reload that hasn't started
         * yet.
         */
        DEBUG(1,("Could not signal service [%s].\n", svc->name));
        return EIO;
    }

    msg = dbus_message_new_method_call(NULL,
                                       MONITOR_PATH,
                                       MONITOR_INTERFACE,
                                       svc_signal);
    if (!msg) {
        DEBUG(0,("Out of memory?!\n"));
        monitor_kill_service(svc);
        talloc_free(svc);
        return ENOMEM;
    }

    ret = sbus_conn_send(svc->conn, msg,
                         svc->mt_ctx->service_id_timeout,
                         reload_reply, svc, NULL);

    dbus_message_unref(msg);
    return ret;
}

static int service_signal_dns_reload(struct mt_svc *svc)
{
    return service_signal(svc, MON_CLI_METHOD_RES_INIT);
}
static int service_signal_offline(struct mt_svc *svc)
{
    return service_signal(svc, MON_CLI_METHOD_OFFLINE);
}
static int service_signal_reset_offline(struct mt_svc *svc)
{
    return service_signal(svc, MON_CLI_METHOD_RESET_OFFLINE);
}
static int service_signal_rotate(struct mt_svc *svc)
{
    return service_signal(svc, MON_CLI_METHOD_ROTATE);
}

static int check_domain_ranges(struct sss_domain_info *domains)
{
    struct sss_domain_info *dom = domains, *other = NULL;
    uint32_t id_min, id_max;

    while (dom) {
        other = dom->next;
        if (dom->id_max && dom->id_min > dom->id_max) {
            DEBUG(1, ("Domain '%s' does not have a valid ID range\n",
                      dom->name));
            return EINVAL;
        }

        while (other) {
            id_min = MAX(dom->id_min, other->id_min);
            id_max = MIN((dom->id_max ? dom->id_max : UINT32_MAX),
                         (other->id_max ? other->id_max : UINT32_MAX));
            if (id_min <= id_max) {
                DEBUG(1, ("Domains '%s' and '%s' overlap in range %u - %u\n",
                          dom->name, other->name, id_min, id_max));
            }
            other = other->next;
        }
        dom = dom->next;
    }

    return EOK;
}

static int check_local_domain_unique(struct sss_domain_info *domains)
{
    uint8_t count = 0;

    struct sss_domain_info *dom = domains;

    while (dom) {
        if (strcasecmp(dom->provider, "local") == 0) {
            count++;
        }

        if (count > 1) {
            break;
        }

        dom = dom->next;
    }

    if (count > 1) {
        return EINVAL;
    }

    return EOK;
}

static char *check_services(char **services)
{
    const char *known_services[] = { "nss", "pam", NULL };
    int i;
    int ii;

    /* Check if services we are about to start are in the list if known */
    for (i = 0; services[i]; i++) {
        for (ii=0; known_services[ii]; ii++) {
            if (strcasecmp(services[i], known_services[ii]) == 0) {
                break;
            }
        }

        if (known_services[ii] == NULL) {
            return services[i];
        }
    }

    return NULL;
}

int get_monitor_config(struct mt_ctx *ctx)
{
    int ret;
    int timeout_seconds;
    char *badsrv = NULL;

    ret = confdb_get_int(ctx->cdb, ctx,
                         CONFDB_MONITOR_CONF_ENTRY,
                         CONFDB_MONITOR_SBUS_TIMEOUT,
                         10, &timeout_seconds);
    if (ret != EOK) {
        return ret;
    }

    ctx->service_id_timeout = timeout_seconds * 1000; /* service_id_timeout is in ms */

    ctx->service_ctx = talloc_new(ctx);
    if(!ctx->service_ctx) {
        return ENOMEM;
    }
    ret = confdb_get_string_as_list(ctx->cdb, ctx->service_ctx,
                                    CONFDB_MONITOR_CONF_ENTRY,
                                    CONFDB_MONITOR_ACTIVE_SERVICES,
                                    &ctx->services);
    if (ret != EOK) {
        DEBUG(0, ("No services configured!\n"));
        return EINVAL;
    }

    badsrv = check_services(ctx->services);
    if (badsrv != NULL) {
        DEBUG(0, ("Invalid service %s\n", badsrv));
        return EINVAL;
    }

    ctx->domain_ctx = talloc_new(ctx);
    if(!ctx->domain_ctx) {
        return ENOMEM;
    }
    ret = confdb_get_domains(ctx->cdb, &ctx->domains);
    if (ret != EOK) {
        DEBUG(0, ("No domains configured.\n"));
        return ret;
    }

    ret = check_local_domain_unique(ctx->domains);
    if (ret != EOK) {
        DEBUG(0, ("More than one local domain configured.\n"));
        return ret;
    }

    /* Check UID/GID overlaps */
    ret = check_domain_ranges(ctx->domains);
    if (ret != EOK) {
        return ret;
    }

    return EOK;
}

static int get_service_config(struct mt_ctx *ctx, const char *name,
                              struct mt_svc **svc_cfg)
{
    int ret;
    char *path;
    struct mt_svc *svc;

    *svc_cfg = NULL;

    svc = talloc_zero(ctx, struct mt_svc);
    if (!svc) {
        return ENOMEM;
    }
    svc->mt_ctx = ctx;

    talloc_set_destructor((TALLOC_CTX *)svc, svc_destructor);

    svc->name = talloc_strdup(svc, name);
    if (!svc->name) {
        talloc_free(svc);
        return ENOMEM;
    }

    svc->identity = talloc_strdup(svc, name);
    if (!svc->identity) {
        talloc_free(svc);
        return ENOMEM;
    }

    path = talloc_asprintf(svc, CONFDB_SERVICE_PATH_TMPL, svc->name);
    if (!path) {
        talloc_free(svc);
        return ENOMEM;
    }

    ret = confdb_get_string(ctx->cdb, svc, path,
                            CONFDB_SERVICE_COMMAND,
                            NULL, &svc->command);
    if (ret != EOK) {
        DEBUG(0,("Failed to start service '%s'\n", svc->name));
        talloc_free(svc);
        return ret;
    }

    if (!svc->command) {
        svc->command = talloc_asprintf(
            svc, "%s/sssd_%s", SSSD_LIBEXEC_PATH, svc->name
        );
        if (!svc->command) {
            talloc_free(svc);
            return ENOMEM;
        }

        if (cmdline_debug_level != SSSDBG_UNRESOLVED) {
            svc->command = talloc_asprintf_append(
                svc->command, " -d %#.4x", cmdline_debug_level
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }

        if (cmdline_debug_timestamps != SSSDBG_TIMESTAMP_UNRESOLVED) {
            svc->command = talloc_asprintf_append(
                svc->command, " --debug-timestamps=%d", cmdline_debug_timestamps
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }

        if (cmdline_debug_microseconds != SSSDBG_MICROSECONDS_UNRESOLVED) {
            svc->command = talloc_asprintf_append(
                svc->command, " --debug-microseconds=%d",
                cmdline_debug_microseconds
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }

        if (debug_to_file) {
            svc->command = talloc_strdup_append(
                svc->command, " --debug-to-files"
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }
    }

    ret = confdb_get_int(ctx->cdb, svc, path,
                         CONFDB_SERVICE_TIMEOUT,
                         MONITOR_DEF_PING_TIME, &svc->ping_time);
    if (ret != EOK) {
        DEBUG(0,("Failed to start service '%s'\n", svc->name));
        talloc_free(svc);
        return ret;
    }

    /* 'timeout = 0' should be translated to the default */
    if (svc->ping_time == 0) {
        svc->ping_time = MONITOR_DEF_PING_TIME;
    }

    *svc_cfg = svc;
    talloc_free(path);

    return EOK;
}

static int add_new_service(struct mt_ctx *ctx, const char *name)
{
    int ret;
    struct mt_svc *svc;

    ret = get_service_config(ctx, name, &svc);
    if (ret != EOK) {
        return ret;
    }

    ret = start_service(svc);
    if (ret != EOK) {
        DEBUG(0,("Failed to start service '%s'\n", svc->name));
        talloc_free(svc);
    }

    return ret;
}

static int get_provider_config(struct mt_ctx *ctx, const char *name,
                              struct mt_svc **svc_cfg)
{
    int ret;
    char *path;
    struct mt_svc *svc;

    *svc_cfg = NULL;

    svc = talloc_zero(ctx, struct mt_svc);
    if (!svc) {
        return ENOMEM;
    }
    svc->mt_ctx = ctx;

    talloc_set_destructor((TALLOC_CTX *)svc, svc_destructor);

    svc->name = talloc_strdup(svc, name);
    if (!svc->name) {
        talloc_free(svc);
        return ENOMEM;
    }

    svc->identity = talloc_asprintf(svc, "%%BE_%s", svc->name);
    if (!svc->identity) {
        talloc_free(svc);
        return ENOMEM;
    }

    path = talloc_asprintf(svc, CONFDB_DOMAIN_PATH_TMPL, name);
    if (!path) {
        talloc_free(svc);
        return ENOMEM;
    }

    ret = confdb_get_string(ctx->cdb, svc, path,
                            CONFDB_DOMAIN_ID_PROVIDER,
                            NULL, &svc->provider);
    if (ret != EOK) {
        DEBUG(0, ("Failed to find ID provider from [%s] configuration\n", name));
        talloc_free(svc);
        return ret;
    }

    ret = confdb_get_string(ctx->cdb, svc, path,
                            CONFDB_DOMAIN_COMMAND,
                            NULL, &svc->command);
    if (ret != EOK) {
        DEBUG(0, ("Failed to find command from [%s] configuration\n", name));
        talloc_free(svc);
        return ret;
    }

    ret = confdb_get_int(ctx->cdb, svc, path,
                         CONFDB_DOMAIN_TIMEOUT,
                         MONITOR_DEF_PING_TIME, &svc->ping_time);
    if (ret != EOK) {
        DEBUG(0,("Failed to start service '%s'\n", svc->name));
        talloc_free(svc);
        return ret;
    }

    /* 'timeout = 0' should be translated to the default */
    if (svc->ping_time == 0) {
        svc->ping_time = MONITOR_DEF_PING_TIME;
    }

    talloc_free(path);

    /* if no provider is present do not run the domain */
    if (!svc->provider) {
        talloc_free(svc);
        return EIO;
    }

    /* if there are no custom commands, build a default one */
    if (!svc->command) {
        svc->command = talloc_asprintf(
            svc, "%s/sssd_be --domain %s", SSSD_LIBEXEC_PATH, svc->name
        );
        if (!svc->command) {
            talloc_free(svc);
            return ENOMEM;
        }

        if (cmdline_debug_level != SSSDBG_UNRESOLVED) {
            svc->command = talloc_asprintf_append(
                svc->command, " -d %#.4x", cmdline_debug_level
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }

        if (cmdline_debug_timestamps != SSSDBG_TIMESTAMP_UNRESOLVED) {
            svc->command = talloc_asprintf_append(
                svc->command, " --debug-timestamps=%d", cmdline_debug_timestamps
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }

        if (cmdline_debug_microseconds != SSSDBG_MICROSECONDS_UNRESOLVED) {
            svc->command = talloc_asprintf_append(
                svc->command, " --debug-microseconds=%d",
                cmdline_debug_microseconds
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }

        if (debug_to_file) {
            svc->command = talloc_strdup_append(
                svc->command, " --debug-to-files"
            );
            if (!svc->command) {
                talloc_free(svc);
                return ENOMEM;
            }
        }
    }

    *svc_cfg = svc;
    return EOK;
}

static int add_new_provider(struct mt_ctx *ctx, const char *name)
{
    int ret;
    struct mt_svc *svc;

    ret = get_provider_config(ctx, name, &svc);
    if (ret != EOK) {
        DEBUG(0, ("Could not get provider configuration for [%s]\n",
                  name));
        return ret;
    }

    if (strcasecmp(svc->provider, "local") == 0) {
        /* The LOCAL provider requires no back-end currently
         * We'll add it to the service list, but we don't need
         * to poll it.
         */
        svc->svc_started = true;
        DLIST_ADD(ctx->svc_list, svc);
        return ENOENT;
    }

    ret = start_service(svc);
    if (ret != EOK) {
        DEBUG(0,("Failed to start service '%s'\n", svc->name));
        talloc_free(svc);
    }

    return ret;
}

static void monitor_hup(struct tevent_context *ev,
                        struct tevent_signal *se,
                        int signum,
                        int count,
                        void *siginfo,
                        void *private_data)
{
    struct mt_ctx *ctx = talloc_get_type(private_data, struct mt_ctx);
    struct mt_svc *cur_svc;

    DEBUG(1, ("Received SIGHUP.\n"));

    /* Signal all services to rotate debug files */
    for(cur_svc = ctx->svc_list; cur_svc; cur_svc = cur_svc->next) {
        service_signal_rotate(cur_svc);
    }
}

static int monitor_cleanup(void)
{
    char *file;
    int ret;
    TALLOC_CTX *tmp_ctx;

    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) return ENOMEM;

    file = talloc_asprintf(tmp_ctx, "%s/%s.pid", PID_PATH, "sssd");
    if (file == NULL) {
        return ENOMEM;
    }

    errno = 0;
    ret = unlink(file);
    if (ret == -1) {
        ret = errno;
        DEBUG(0, ("Error removing pidfile! (%d [%s])\n",
                ret, strerror(ret)));
        talloc_free(file);
        return errno;
    }

    talloc_free(file);
    return EOK;
}

static void monitor_quit(struct tevent_context *ev,
                         struct tevent_signal *se,
                         int signum,
                         int count,
                         void *siginfo,
                         void *private_data)
{
    struct mt_ctx *mt_ctx = talloc_get_type(private_data, struct mt_ctx);
    struct mt_svc *svc;
    pid_t pid;
    int status;
    errno_t error;
    int kret;
    bool killed;

    DEBUG(8, ("Received shutdown command\n"));

    DEBUG(0, ("Monitor received %s: terminating children\n",
              strsignal(signum)));

    /* Kill all of our known children manually */
    DLIST_FOR_EACH(svc, mt_ctx->svc_list) {
        if (svc->pid == 0) {
            /* The local provider has no PID */
            continue;
        }

        killed = false;
        DEBUG(1, ("Terminating [%s][%d]\n", svc->name, svc->pid));
        do {
            errno = 0;
            kret = kill(svc->pid, SIGTERM);
            if (kret < 0) {
                error = errno;
                DEBUG(1, ("Couldn't kill [%s][%d]: [%s]\n",
                          svc->name, svc->pid, strerror(error)));
            }

            error = 0;
            do {
                errno = 0;
                pid = waitpid(svc->pid, &status, WNOHANG);
                if (pid == -1) {
                    /* An error occurred while waiting */
                    error = errno;
                    if (error != EINTR) {
                        DEBUG(0, ("[%d][%s] while waiting for [%s]\n",
                                  error, strerror(error), svc->name));
                        /* Forcibly kill this child */
                        kill(svc->pid, SIGKILL);
                        break;
                    }
                } else if (pid != 0) {
                    error = 0;
                    if WIFEXITED(status) {
                        DEBUG(1, ("Child [%s] exited gracefully\n", svc->name));
                    } else if WIFSIGNALED(status) {
                        DEBUG(1, ("Child [%s] terminated with a signal\n", svc->name));
                    } else {
                        DEBUG(0, ("Child [%s] did not exit cleanly\n", svc->name));
                        /* Forcibly kill this child */
                        kill(svc->pid, SIGKILL);
                    }
                    killed = true;
                }
            } while (error == EINTR);
            if (!killed) {
                /* Sleep 10ms and try again */
                usleep(10000);
            }
        } while (!killed);
    }

#if HAVE_GETPGRP
    /* Kill any remaining children in our process group, just in case
     * we have any leftover children we don't expect. For example, if
     * a krb5_child or ldap_child is running at the same moment.
     */
    error = 0;
    if (getpgrp() == getpid()) {
        kill(-getpgrp(), SIGTERM);
        do {
            errno = 0;
            pid = waitpid(0, &status, 0);
            if (pid == -1) {
                error = errno;
            }
        } while (error == EINTR || pid > 0);
    }
#endif

    monitor_cleanup();

    exit(0);
}

static void signal_offline(struct tevent_context *ev,
                           struct tevent_signal *se,
                           int signum,
                           int count,
                           void *siginfo,
                           void *private_data)
{
    struct mt_ctx *monitor;
    struct mt_svc *cur_svc;

    monitor = talloc_get_type(private_data, struct mt_ctx);

    DEBUG(8, ("Signaling providers to go offline immediately.\n"));

    /* Signal all providers to immediately go offline */
    for(cur_svc = monitor->svc_list; cur_svc; cur_svc = cur_svc->next) {
        /* Don't signal services, only providers */
        if (cur_svc->provider) {
            service_signal_offline(cur_svc);
        }
    }
}

static void signal_offline_reset(struct tevent_context *ev,
                                 struct tevent_signal *se,
                                 int signum,
                                 int count,
                                 void *siginfo,
                                 void *private_data)
{
    struct mt_ctx *monitor;
    struct mt_svc *cur_svc;

    monitor = talloc_get_type(private_data, struct mt_ctx);

    DEBUG(8, ("Signaling providers to reset offline immediately.\n"));

    for(cur_svc = monitor->svc_list; cur_svc; cur_svc = cur_svc->next) {
        if (cur_svc->provider) {
            service_signal_reset_offline(cur_svc);
        }
    }
}

int read_config_file(const char *config_file)
{
    int ret;
    struct collection_item *sssd_config = NULL;
    struct collection_item *error_list = NULL;

    /* Read the configuration into a collection */
    ret = config_from_file("sssd", config_file, &sssd_config,
                           INI_STOP_ON_ANY, &error_list);
    if (ret != EOK) {
        DEBUG(0, ("Parse error reading configuration file [%s]\n",
                  config_file));
        print_file_parsing_errors(stderr, error_list);
    }

    free_ini_config_errors(error_list);
    free_ini_config(sssd_config);
    return ret;
}

static int monitor_ctx_destructor(void *mem)
{
    struct mt_ctx *mon = talloc_get_type(mem, struct mt_ctx);
    struct mt_svc *svc;

    /* zero out references in svcs so that they don't try
     * to access the monitor context on process shutdown */

    for (svc = mon->svc_list; svc; svc = svc->next) {
        svc->mt_ctx = NULL;
    }
    return 0;
}

static errno_t load_configuration(TALLOC_CTX *mem_ctx,
                                  const char *config_file,
                                  struct mt_ctx **monitor)
{
    errno_t ret;
    struct mt_ctx *ctx;
    char *cdb_file = NULL;

    ctx = talloc_zero(mem_ctx, struct mt_ctx);
    if(!ctx) {
        return ENOMEM;
    }
    talloc_set_destructor((TALLOC_CTX *)ctx, monitor_ctx_destructor);

    cdb_file = talloc_asprintf(ctx, "%s/%s", DB_PATH, CONFDB_FILE);
    if (cdb_file == NULL) {
        DEBUG(0,("Out of memory, aborting!\n"));
        ret = ENOMEM;
        goto done;
    }

    ret = confdb_init(ctx, &ctx->cdb, cdb_file);
    if (ret != EOK) {
        DEBUG(0,("The confdb initialization failed\n"));
        goto done;
    }

    /* Initialize the CDB from the configuration file */
    ret = confdb_test(ctx->cdb);
    if (ret == ENOENT) {
        /* First-time setup */

        /* Purge any existing confdb in case an old
         * misconfiguration gets in the way
         */
        talloc_zfree(ctx->cdb);
        unlink(cdb_file);

        ret = confdb_init(ctx, &ctx->cdb, cdb_file);
        if (ret != EOK) {
            DEBUG(0,("The confdb initialization failed\n"));
            goto done;
        }

        /* Load special entries */
        ret = confdb_create_base(ctx->cdb);
        if (ret != EOK) {
            DEBUG(0, ("Unable to load special entries into confdb\n"));
            goto done;
        }
    } else if (ret != EOK) {
        DEBUG(0, ("Fatal error initializing confdb\n"));
        goto done;
    }
    talloc_zfree(cdb_file);

    ret = confdb_init_db(config_file, ctx->cdb);
    if (ret != EOK) {
        DEBUG(0, ("ConfDB initialization has failed [%s]\n",
              strerror(ret)));
        goto done;
    }

    /* Validate the configuration in the database */
    /* Read in the monitor's configuration */
    ret = get_monitor_config(ctx);
    if (ret != EOK) {
        goto done;
    }

    *monitor = ctx;

    ret = EOK;

done:
    if (ret != EOK) {
        talloc_free(ctx);
    }
    return ret;
}

#ifdef HAVE_SYS_INOTIFY_H
static void process_config_file(struct tevent_context *ev,
                                struct tevent_timer *te,
                                struct timeval t, void *ptr);

static void config_file_changed(struct tevent_context *ev,
                                struct tevent_fd *fde,
                                uint16_t flags, void *data)
{
    struct tevent_timer *te = NULL;
    struct timeval tv;
    struct config_file_ctx *file_ctx;

    file_ctx = talloc_get_type(data, struct config_file_ctx);
    if (file_ctx->needs_update) {
        /* Skip updating. It's already queued for update.
         */
        return;
    }

    /* We will queue the file for update in one second.
     * This way, if there is a script writing to the file
     * repeatedly, we won't be attempting to update multiple
     * times.
     */
    gettimeofday(&tv, NULL);
    tv.tv_sec += 1;

    te = tevent_add_timer(ev, ev, tv, process_config_file, file_ctx);
    if (!te) {
        DEBUG(0, ("Unable to queue config file update! Exiting.\n"));
        kill(getpid(), SIGTERM);
        return;
    }
    file_ctx->needs_update = 1;
}

struct rewatch_ctx {
    struct config_file_callback *cb;
    struct config_file_ctx *file_ctx;
};
static void rewatch_config_file(struct tevent_context *ev,
                                struct tevent_timer *te,
                                struct timeval t, void *ptr);
static void process_config_file(struct tevent_context *ev,
                                struct tevent_timer *te,
                                struct timeval t, void *ptr)
{
    TALLOC_CTX *tmp_ctx;
    struct inotify_event *in_event;
    char *buf;
    char *name;
    ssize_t len, total_len;
    ssize_t event_size;
    struct config_file_ctx *file_ctx;
    struct config_file_callback *cb;
    struct rewatch_ctx *rw_ctx;

    event_size = sizeof(struct inotify_event);
    file_ctx = talloc_get_type(ptr, struct config_file_ctx);

    DEBUG(1, ("Processing config file changes\n"));

    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) return;

    buf = talloc_size(tmp_ctx, event_size);
    if (!buf) {
        goto done;
    }

    total_len = 0;
    while (total_len < event_size) {
        len = read(file_ctx->mt_ctx->inotify_fd, buf+total_len,
                   event_size-total_len);
        if (len == -1) {
            if (errno == EINTR || errno == EAGAIN) continue;
            DEBUG(0, ("Critical error reading inotify file descriptor.\n"));
            goto done;
        }
        total_len += len;
    }

    in_event = (struct inotify_event *)buf;

    if (in_event->len > 0) {
        /* Read in the name, even though we don't use it,
         * so that read ptr is in the right place
         */
        name = talloc_size(tmp_ctx, len);
        if (!name) {
            goto done;
        }
        total_len = 0;
        while (total_len < in_event->len) {
            len = read(file_ctx->mt_ctx->inotify_fd, &name, in_event->len);
            if (len == -1) {
                if (errno == EINTR || errno == EAGAIN) continue;
                DEBUG(0, ("Critical error reading inotify file descriptor.\n"));
                goto done;
            }
            total_len += len;
        }
    }

    for (cb = file_ctx->callbacks; cb; cb = cb->next) {
        if (cb->wd == in_event->wd) {
            break;
        }
    }
    if (!cb) {
        DEBUG(0, ("Unknown watch descriptor\n"));
        goto done;
    }

    if (in_event->mask & IN_IGNORED) {
        /* Some text editors will move a new file on top of the
         * existing one instead of modifying it. In this case,
         * the kernel will send us an IN_IGNORE signal.
         * We will try to open a new watch descriptor on the
         * new file.
         */
        struct timeval tv;
        struct tevent_timer *tev;
        tv.tv_sec = t.tv_sec+5;
        tv.tv_usec = t.tv_usec;
        DEBUG(5, ("Restoring inotify watch.\n"));

        cb->retries = 0;
        rw_ctx = talloc(file_ctx, struct rewatch_ctx);
        if(!rw_ctx) {
            DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
            close(file_ctx->mt_ctx->inotify_fd);
            kill(getpid(), SIGTERM);
            goto done;
        }
        rw_ctx->cb = cb;
        rw_ctx->file_ctx = file_ctx;

        tev = tevent_add_timer(ev, rw_ctx, tv, rewatch_config_file, rw_ctx);
        if (tev == NULL) {
            DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
            close(file_ctx->mt_ctx->inotify_fd);
            kill(getpid(), SIGTERM);
        }
        goto done;
    }

    /* Tell the monitor to signal the children */
    cb->fn(file_ctx, cb->filename);
    file_ctx->needs_update = 0;

done:
    talloc_free(tmp_ctx);
}

errno_t monitor_config_file_fallback(TALLOC_CTX *mem_ctx,
                                     struct mt_ctx *ctx,
                                     const char *file,
                                     monitor_reconf_fn fn);
static void rewatch_config_file(struct tevent_context *ev,
                                struct tevent_timer *te,
                                struct timeval t, void *ptr)
{
    int err;
    struct tevent_timer *tev = NULL;
    struct timeval tv;
    struct config_file_callback *cb;

    struct rewatch_ctx *rw_ctx;
    struct config_file_ctx *file_ctx;

    rw_ctx = talloc_get_type(ptr, struct rewatch_ctx);

    cb = rw_ctx->cb;
    file_ctx = rw_ctx->file_ctx;

    /* Retry six times at five-second intervals before giving up */
    cb->retries++;
    if (cb->retries > 6) {
        DEBUG(0, ("Could not restore inotify watch. Switching to polling!\n"));
        close(file_ctx->mt_ctx->inotify_fd);
        err = monitor_config_file_fallback(file_ctx->parent_ctx,
                                           file_ctx->mt_ctx,
                                           cb->filename,
                                           cb->fn);
        if (err != EOK)
            kill(getpid(), SIGTERM);

        cb->fn(file_ctx, cb->filename);
        talloc_free(rw_ctx);

        /* A new callback was created in monitor_config_file_fallback()*/
        DLIST_REMOVE(file_ctx->callbacks, cb);
        talloc_free(cb);

        return;
    }

    cb->wd = inotify_add_watch(file_ctx->mt_ctx->inotify_fd,
                               cb->filename, IN_MODIFY);
    if (cb->wd < 0) {
        err = errno;

        tv.tv_sec = t.tv_sec+5;
        tv.tv_usec = t.tv_usec;

        DEBUG(1, ("Could not add inotify watch for file [%s]. Error [%d:%s]\n",
                  cb->filename, err, strerror(err)));

        tev = tevent_add_timer(ev, ev, tv, rewatch_config_file, rw_ctx);
        if (tev == NULL) {
            DEBUG(0, ("Could not restore inotify watch. Quitting!\n"));
            close(file_ctx->mt_ctx->inotify_fd);
            kill(getpid(), SIGTERM);
        }

        return;
    }
    cb->retries = 0;

    /* Tell the monitor to signal the children */
    cb->fn(file_ctx, cb->filename);

    talloc_free(rw_ctx);
    file_ctx->needs_update = 0;
}
#endif

static void poll_config_file(struct tevent_context *ev,
                                    struct tevent_timer *te,
                                    struct timeval t, void *ptr)
{
    int ret, err;
    struct stat file_stat;
    struct timeval tv;
    struct config_file_ctx *file_ctx;
    struct config_file_callback *cb;

    file_ctx = talloc_get_type(ptr,struct config_file_ctx);

    for (cb = file_ctx->callbacks; cb; cb = cb->next) {
        ret = stat(cb->filename, &file_stat);
        if (ret < 0) {
            err = errno;
            DEBUG(0, ("Could not stat file [%s]. Error [%d:%s]\n",
                      cb->filename, err, strerror(err)));
            /* TODO: If the config file is missing, should we shut down? */
            return;
        }

        if (file_stat.st_mtime != cb->modified) {
            /* Parse the configuration file and signal the children */
            /* Note: this will fire if the modification time changes into the past
             * as well as the future.
             */
            DEBUG(1, ("Config file changed\n"));
            cb->modified = file_stat.st_mtime;

            /* Tell the monitor to signal the children */
            cb->fn(file_ctx, cb->filename);
        }
    }

    gettimeofday(&tv, NULL);
    tv.tv_sec += CONFIG_FILE_POLL_INTERVAL;
    tv.tv_usec = 0;
    file_ctx->timer = tevent_add_timer(ev, file_ctx->parent_ctx, tv,
                             poll_config_file, file_ctx);
    if (!file_ctx->timer) {
        DEBUG(0, ("Error: Config file no longer monitored for changes!\n"));
    }
}

static int try_inotify(struct config_file_ctx *file_ctx, const char *filename,
                       monitor_reconf_fn fn)
{
#ifdef HAVE_SYS_INOTIFY_H
    int err, fd_args, ret;
    struct tevent_fd *tfd;
    struct config_file_callback *cb;

    /* Monitoring the file descriptor should be global */
    if (!file_ctx->mt_ctx->inotify_fd) {
        /* Set up inotify to monitor the config file for changes */
        file_ctx->mt_ctx->inotify_fd = inotify_init();
        if (file_ctx->mt_ctx->inotify_fd < 0) {
            err = errno;
            DEBUG(0, ("Could not initialize inotify, error [%d:%s]\n",
                      err, strerror(err)));
            return err;
        }

        fd_args = fcntl(file_ctx->mt_ctx->inotify_fd, F_GETFL, NULL);
        if (fd_args < 0) {
            /* Could not set nonblocking */
            close(file_ctx->mt_ctx->inotify_fd);
            return EINVAL;
        }

        fd_args |= O_NONBLOCK;
        ret = fcntl(file_ctx->mt_ctx->inotify_fd, F_SETFL, fd_args);
        if (ret < 0) {
            /* Could not set nonblocking */
            close(file_ctx->mt_ctx->inotify_fd);
            return EINVAL;
        }

        /* Add the inotify file descriptor to the TEvent context */
        tfd = tevent_add_fd(file_ctx->mt_ctx->ev, file_ctx,
                            file_ctx->mt_ctx->inotify_fd,
                            TEVENT_FD_READ, config_file_changed,
                            file_ctx);
        if (!tfd) {
            close(file_ctx->mt_ctx->inotify_fd);
            return EIO;
        }
    }

    cb = talloc_zero(file_ctx, struct config_file_callback);
    if(!cb) {
        close(file_ctx->mt_ctx->inotify_fd);
        return EIO;
    }

    cb->filename = talloc_strdup(cb, filename);
    if (!cb->filename) {
        close(file_ctx->mt_ctx->inotify_fd);
        return ENOMEM;
    }
    cb->wd = inotify_add_watch(file_ctx->mt_ctx->inotify_fd,
                               cb->filename, IN_MODIFY);
    if (cb->wd < 0) {
        err = errno;
        DEBUG(0, ("Could not add inotify watch for file [%s]. Error [%d:%s]\n",
                  cb->filename, err, strerror(err)));
        close(file_ctx->mt_ctx->inotify_fd);
        return err;
    }
    cb->fn = fn;

    DLIST_ADD(file_ctx->callbacks, cb);

    return EOK;
#else
    return EINVAL;
#endif
}

static int monitor_config_file(TALLOC_CTX *mem_ctx,
                               struct mt_ctx *ctx,
                               const char *file,
                               monitor_reconf_fn fn)
{
    int ret, err;
    bool use_inotify;
    struct stat file_stat;

    ret = stat(file, &file_stat);
    if (ret < 0) {
        err = errno;
        DEBUG(0, ("Could not stat file [%s]. Error [%d:%s]\n",
                  file, err, strerror(err)));
        return err;
    }
    if (!ctx->file_ctx) {
        ctx->file_ctx = talloc_zero(mem_ctx, struct config_file_ctx);
        if (!ctx->file_ctx) return ENOMEM;

        ctx->file_ctx->parent_ctx = mem_ctx;
        ctx->file_ctx->mt_ctx = ctx;
    }

    ret = confdb_get_bool(ctx->cdb, ctx,
                          CONFDB_MONITOR_CONF_ENTRY,
                          CONFDB_MONITOR_TRY_INOTIFY,
                          true, &use_inotify);
    if (ret != EOK) {
        talloc_free(ctx->file_ctx);
        return ret;
    }

    if (use_inotify) {
        ret = try_inotify(ctx->file_ctx, file, fn);
        if (ret != EOK) {
            use_inotify = false;
        }
    }

    if (!use_inotify) {
        /* Could not monitor file with inotify, fall back to polling */
        ret = monitor_config_file_fallback(mem_ctx, ctx, file, fn);
    }

    return ret;
}

errno_t monitor_config_file_fallback(TALLOC_CTX *mem_ctx,
                                     struct mt_ctx *ctx,
                                     const char *file,
                                     monitor_reconf_fn fn)
{
    struct config_file_callback *cb = NULL;
    struct stat file_stat;
    int ret, err;
    struct timeval tv;

    ret = stat(file, &file_stat);
    if (ret < 0) {
        err = errno;
        DEBUG(0, ("Could not stat file [%s]. Error [%d:%s]\n",
                  file, err, strerror(err)));
        return err;
    }

    cb = talloc_zero(ctx->file_ctx, struct config_file_callback);
    if (!cb) {
        talloc_free(ctx->file_ctx);
        return ENOMEM;
    }
    cb->filename = talloc_strdup(cb, file);
    if (!cb->filename) {
        talloc_free(ctx->file_ctx);
        return ENOMEM;
    }
    cb->fn = fn;
    cb->modified = file_stat.st_mtime;

    DLIST_ADD(ctx->file_ctx->callbacks, cb);

    if(!ctx->file_ctx->timer) {
        gettimeofday(&tv, NULL);
        tv.tv_sec += CONFIG_FILE_POLL_INTERVAL;
        tv.tv_usec = 0;
        ctx->file_ctx->timer = tevent_add_timer(ctx->ev, mem_ctx, tv,
                poll_config_file, ctx->file_ctx);
        if (!ctx->file_ctx->timer) {
            talloc_free(ctx->file_ctx);
            return EIO;
        }
    }

    return EOK;
}

int monitor_process_init(struct mt_ctx *ctx,
                         const char *config_file)
{
    TALLOC_CTX *tmp_ctx;
    struct sysdb_ctx_list *db_list;
    struct tevent_signal *tes;
    struct sss_domain_info *dom;
    char *rcachedir;
    int num_providers;
    int ret;
    int error;

    /* Set up the environment variable for the Kerberos Replay Cache */
    ret = confdb_get_string(ctx->cdb, ctx,
                            CONFDB_MONITOR_CONF_ENTRY,
                            CONFDB_MONITOR_KRB5_RCACHEDIR,
                            KRB5_RCACHE_DIR,
                            &rcachedir);
    if (ret != EOK) {
        return ret;
    }

    if (strcmp(rcachedir, KRB5_RCACHE_DIR_DISABLE) != 0)
    {
        errno = 0;
        ret = setenv("KRB5RCACHEDIR", rcachedir, 1);
        if (ret < 0) {
            error = errno;
            DEBUG(1,
                  ("Unable to set KRB5RCACHEDIR: %s."
                   "Will attempt to use libkrb5 defaults\n",
                   strerror(error)));
        }
        talloc_zfree(rcachedir);
    }

    /* Set up an event handler for a SIGHUP */
    tes = tevent_add_signal(ctx->ev, ctx, SIGHUP, 0,
                            monitor_hup, ctx);
    if (tes == NULL) {
        return EIO;
    }

    /* Set up an event handler for a SIGINT */
    BlockSignals(false, SIGINT);
    tes = tevent_add_signal(ctx->ev, ctx, SIGINT, 0,
                            monitor_quit, ctx);
    if (tes == NULL) {
        return EIO;
    }

    /* Set up an event handler for a SIGTERM */
    tes = tevent_add_signal(ctx->ev, ctx, SIGTERM, 0,
                            monitor_quit, ctx);
    if (tes == NULL) {
        return EIO;
    }

    /* Handle SIGUSR1 (tell all providers to go offline) */
    BlockSignals(false, SIGUSR1);
    tes = tevent_add_signal(ctx->ev, ctx, SIGUSR1, 0,
                            signal_offline, ctx);
    if (tes == NULL) {
        return EIO;
    }

    /* Handle SIGUSR2 (tell all providers to go reset offline) */
    BlockSignals(false, SIGUSR2);
    tes = tevent_add_signal(ctx->ev, ctx, SIGUSR2, 0,
                            signal_offline_reset, ctx);
    if (tes == NULL) {
        return EIO;
    }

#if 0
    This feature is incomplete and can leave the SSSD in a bad state if the
    config file is changed while the SSSD is running.

    Uncomment this once the backends are honoring reloadConfig()

    /* Watch for changes to the confdb config file */
    ret = monitor_config_file(ctx, ctx, config_file, monitor_signal_reconf);
    if (ret != EOK) {
        return ret;
    }
#endif
    /* Watch for changes to the DNS resolv.conf */
    ret = monitor_config_file(ctx, ctx, RESOLV_CONF_PATH,
                              monitor_update_resolv);
    if (ret != EOK) {
        return ret;
    }

    /* Avoid a startup race condition between process.
     * We need to handle DB upgrades or DB creation only
     * in one process before all other start.
     */
    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) {
        return ENOMEM;
    }
    ret = sysdb_init(tmp_ctx, ctx->cdb, NULL, true, &db_list);
    if (ret != EOK) {
        return ret;
    }
    talloc_zfree(tmp_ctx);

    /* Initialize D-BUS Server
     * The monitor will act as a D-BUS server for all
     * SSSD processes */
    ret = monitor_dbus_init(ctx);
    if (ret != EOK) {
        return ret;
    }

    ret = setup_netlink(ctx, ctx->ev, network_status_change_cb,
                        ctx, &ctx->nlctx);
    if (ret != EOK) {
        DEBUG(2, ("Cannot set up listening for network notifications\n"));
        return ret;
    }

    /* start providers */
    num_providers = 0;
    for (dom = ctx->domains; dom; dom = dom->next) {
        ret = add_new_provider(ctx, dom->name);
        if (ret != EOK && ret != ENOENT) {
            return ret;
        }
        if (ret != ENOENT) {
            num_providers++;
        }
    }

    if (num_providers > 0) {
        /* now set the services stratup timeout *
         * (responders will be started automatically when all
         *  providers are up and running or when the tomeout
         *  expires) */
        ret = add_services_startup_timeout(ctx);
        if (ret != EOK) {
            return ret;
        }
    } else {
        int i;

        ctx->services_started = true;

        /* No providers start services immediately
         * Normally this means only LOCAL is configured */
        for (i = 0; ctx->services[i]; i++) {
            add_new_service(ctx, ctx->services[i]);
        }
    }

    /* now start checking for global events */
    set_global_checker(ctx);

    return EOK;
}

static void init_timeout(struct tevent_context *ev,
                         struct tevent_timer *te,
                         struct timeval t, void *ptr)
{
    struct mon_init_conn *mini;

    DEBUG(2, ("Client timed out before Identification!\n"));

    mini = talloc_get_type(ptr, struct mon_init_conn);

    sbus_disconnect(mini->conn);
    talloc_zfree(mini);
}

/*
 * monitor_service_init
 * Set up a timeout function and temporary connection structure.
 * If the client does not identify before the timeout kicks in,
 * the client is forcibly disconnected.
 */
static int monitor_service_init(struct sbus_connection *conn, void *data)
{
    struct mt_ctx *ctx;
    struct mon_init_conn *mini;
    struct timeval tv;

    DEBUG(3, ("Initializing D-BUS Service\n"));

    ctx = talloc_get_type(data, struct mt_ctx);

    mini = talloc(conn, struct mon_init_conn);
    if (!mini) {
        DEBUG(0,("Out of memory?!\n"));
        talloc_zfree(conn);
        return ENOMEM;
    }
    mini->ctx = ctx;
    mini->conn = conn;

    /* 5 seconds should be plenty */
    tv = tevent_timeval_current_ofs(10, 0);

    mini->timeout = tevent_add_timer(ctx->ev, mini, tv, init_timeout, mini);
    if (!mini->timeout) {
        DEBUG(0,("Out of memory?!\n"));
        talloc_zfree(conn);
        return ENOMEM;
    }

    sbus_conn_set_private_data(conn, mini);

    return EOK;
}

/* service_send_ping
 * this function send a dbus ping to a service.
 * It returns EOK if all is fine or ENXIO if the connection is
 * not available (either not yet set up or teared down).
 * Returns e generic error in other cases.
 */
static int service_send_ping(struct mt_svc *svc)
{
    DBusMessage *msg;
    int ret;

    if (!svc->conn) {
        DEBUG(8, ("Service not yet initialized\n"));
        return ENXIO;
    }

    DEBUG(4,("Pinging %s\n", svc->name));

    /*