/***************************************************************** ** ** @(#) zkt-soaserial.c (c) Oct 2007 Holger Zuleger hznet.de ** ** A small utility to print out the (unixtime) soa serial ** number in a human readable form ** ** Copyright (c) Oct 2007, Holger Zuleger HZnet. All rights reserved. ** ** This software is open source. ** ** Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions ** are met: ** ** Redistributions of source code must retain the above copyright notice, ** this list of conditions and the following disclaimer. ** ** Redistributions in binary form must reproduce the above copyright notice, ** this list of conditions and the following disclaimer in the documentation ** and/or other materials provided with the distribution. ** ** Neither the name of Holger Zuleger HZnet nor the names of its contributors may ** be used to endorse or promote products derived from this software without ** specific prior written permission. ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ** TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR ** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE ** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS ** INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN ** CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ** ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ** POSSIBILITY OF SUCH DAMAGE. ** *****************************************************************/ # include <stdio.h> # include <string.h> # include <sys/types.h> # include <time.h> # include <utime.h> # include <assert.h> # include <stdlib.h> # include <ctype.h> #ifdef HAVE_CONFIG_H # include <config.h> #endif # include "config_zkt.h" static const char *progname; static char *timestr (time_t sec); static int read_serial_fromfile (const char *fname, unsigned long *serial); static void printserial (const char *fname, unsigned long serial); static void usage (const char *msg); /***************************************************************** ** timestr (sec) *****************************************************************/ static char *timestr (time_t sec) { struct tm *t; static char timestr[31+1]; /* 27+1 should be enough */ #if defined(HAVE_STRFTIME) && HAVE_STRFTIME t = localtime (&sec); strftime (timestr, sizeof (timestr), "%b %d %Y %T %z", t); #else static char *mstr[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; int h, s; t = localtime (&sec); s = abs (t->tm_gmtoff); h = t->tm_gmtoff / 3600; s = t->tm_gmtoff % 3600; snprintf (timestr, sizeof (timestr), "%s %2d %4d %02d:%02d:%02d %c%02d%02d", mstr[t->tm_mon], t->tm_mday, t->tm_year + 1900, t->tm_hour, t->tm_min, t->tm_sec, t->tm_gmtoff < 0 ? '-': '+', h, s); #endif return timestr; } /**************************************************************** ** ** int read_serial_fromfile (filename) ** ** This function depends on a special syntax formating the ** SOA record in the zone file!! ** ** To match the SOA record, the SOA RR must be formatted ** like this: ** @ IN SOA <master.fq.dn.> <hostmaster.fq.dn.> ( ** <SPACEes or TABs> 1234567890; serial number ** <SPACEes or TABs> 86400 ; other values ** ... ** ****************************************************************/ static int read_serial_fromfile (const char *fname, unsigned long *serial) { FILE *fp; char buf[4095+1]; char master[254+1]; int c; int soafound; if ( (fp = fopen (fname, "r")) == NULL ) return -1; /* file not found */ /* read until the line matches the beginning of a soa record ... */ soafound = 0; while ( !soafound && fgets (buf, sizeof buf, fp) ) { if ( sscanf (buf, "%*s %*d IN SOA %255s %*s (\n", master) == 1 ) soafound = 1; else if ( sscanf (buf, "%*s IN SOA %255s %*s (\n", master) == 1 ) soafound = 1; } if ( !soafound ) return -2; /* no zone file (soa not found) */ /* move forward until any non ws is reached */ while ( (c = getc (fp)) != EOF && isspace (c) ) ; ungetc (c, fp); /* pushback the non ws */ *serial = 0L; /* read in the current serial number */ if ( fscanf (fp, "%lu", serial) != 1 ) /* try to get serial no */ return -3; /* no serial number found */ fclose (fp); return 0; /* ok! */ } /***************************************************************** ** printserial() *****************************************************************/ static void printserial (const char *fname, unsigned long serial) { if ( fname && *fname ) printf ("%-30s\t", fname); printf ("%10lu", serial); /* try to guess the soa serial format */ if ( serial < 1136070000L ) /* plain integer (this is 2006-1-1 00:00 in unixtime format) */ ; else if ( serial > 2006010100L ) /* date format */ { int y, m, d, v; v = serial % 100; serial /= 100; d = serial % 100; serial /= 100; m = serial % 100; serial /= 100; y = serial; printf ("\t%d-%02d-%02d Version %02d", y, m, d, v); } else /* unixtime */ printf ("\t%s\n", timestr (serial) ); printf ("\n"); } /***************************************************************** ** usage (msg) *****************************************************************/ static void usage (const char *msg) { if ( msg && *msg ) fprintf (stderr, "%s\n", msg); fprintf (stderr, "usage: %s {-s serial | signed_zonefile [...]}\n", progname); exit (1); } /***************************************************************** ** main() *****************************************************************/ int main (int argc, char *argv[]) { unsigned long serial; progname = *argv; if ( --argc == 0 ) usage (""); if ( argv[1][0] == '-' ) { if ( argv[1][1] != 's' ) usage ("illegal option"); if ( argc != 2 ) usage ("Option -s requires an argument"); serial = atol (argv[2]); printserial ("", serial); } else while ( argc-- > 0 ) if ( (read_serial_fromfile (*++argv, &serial)) != 0 ) fprintf (stderr, "couldn't read serial number from file %s\n", *argv); else printserial (*argv, serial); return 0; }