80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/* leasefile.c - functions for writing the lease file
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* Time-stamp: <2011-04-25 01:02:26 njk>
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*
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* (c) 2011 Nicholas J. Kain <njkain at gmail dot com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <limits.h>
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#include "log.h"
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#include "strl.h"
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#include "io.h"
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#include "defines.h"
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static char leasefile[PATH_MAX] = "\0";
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static int leasefilefd = -1;
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void set_leasefile(char *lf)
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{
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strlcpy(leasefile, lf, sizeof leasefile);
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}
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void open_leasefile()
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{
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if (strlen(leasefile) > 0) {
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leasefilefd = open(leasefile, O_WRONLY|O_TRUNC|O_CREAT, 0644);
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if (leasefilefd < 0) {
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log_line("Failed to create lease file (%s)\n", leasefile);
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exit(EXIT_FAILURE);
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}
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}
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}
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void write_leasefile(struct in_addr ipnum)
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{
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char ip[INET_ADDRSTRLEN+2];
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int ret;
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if (leasefilefd < 0)
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return;
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inet_ntop(AF_INET, &ipnum, ip, sizeof ip);
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strlcat(ip, "\n", sizeof ip);
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retry_trunc:
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ret = ftruncate(leasefilefd, 0);
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switch (ret) {
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default: break;
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case -1:
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if (errno == EINTR)
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goto retry_trunc;
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log_warning("Failed to truncate lease file.\n");
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return;
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}
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lseek(leasefilefd, 0, SEEK_SET);
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ret = safe_write(leasefilefd, ip, strlen(ip));
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if (ret == -1)
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log_warning("Failed to write ip to lease file.\n");
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else
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fsync(leasefilefd);
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}
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