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/* ISC license. */
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <stdio.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr.h>
#include <skalibs/djbunix.h>
#include <s6-dns/hosts.h>
#define USAGE "s6-dns-hosts-compile [ -i ifile ] [ -o ofile ]"
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv)
{
char const *ifile = "/etc/hosts" ;
char const *ofile = "/etc/hosts.cdb" ;
PROG = "s6-dns-hosts-compile" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "i:o:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'i' : ifile = l.arg ; break ;
case 'o' : ofile = l.arg ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
{
int fdr, fdw ;
size_t len = strlen(ofile) ;
char tmp[len + 29] ;
memcpy(tmp, ofile, len) ;
memcpy(tmp + len, ":s6-dns-hosts-compile:XXXXXX", 29) ;
fdr = openc_read(ifile) ;
if (fdr == -1) strerr_diefu2sys(111, "open ", ifile) ;
fdw = mkstemp(tmp) ;
if (fdw == -1) strerr_diefu2sys(111, "create ", tmp) ;
if (!s6dns_hosts_compile(fdr, fdw))
strerr_diefu4sys(111, "compile ", ifile, " to ", tmp) ;
if (fsync(fdw) == -1) strerr_diefu2sys(111, "fsync ", tmp) ;
if (fchmod(fdw, 0644) == -1) strerr_diefu2sys(111, "fchmod ", tmp) ;
if (rename(tmp, ofile) == -1) strerr_diefu4sys(111, "rename ", tmp, " to ", ofile) ;
}
return 0 ;
}
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