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/* ISC license. */
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <skalibs/posixplz.h>
#include <skalibs/cdb.h>
#include <skalibs/djbunix.h>
#include <s6-dns/hosts.h>
int s6dns_hosts_init (void)
{
int fdr, fdw ;
char tmp[24] = "/tmp/hosts.cdb:XXXXXX" ;
int fdc = openc_read("/etc/hosts.cdb") ;
if (fdc >= 0)
{
struct stat stc, str ;
if (fstat(fdc, &stc) == -1) goto errc ;
if (stat("/etc/hosts", &str) == -1)
{
if (errno == ENOENT) goto useit ;
else goto errc ;
}
if (stc.st_mtim > str.st_mtim) goto useit ;
fd_close(fdc) ;
}
fdr = openc_read("/etc/hosts") ;
if (fdr == -1) return errno == ENOENT ? (errno = 0, 0) : -1 ;
fdw = mkstemp(tmp) ;
if (fdw == -1) goto errr ;
if (!s6dns_hosts_compile(fdr, fdw)) goto errw ;
if (lseek(fdw, 0, SEEK_SET) == -1) goto errw ;
if (!cdb_init_fromfd(&s6dns_hosts_here, fdw)) goto errw ;
fd_close(fdw) ;
unlink_void(tmp) ;
fd_close(fdr) ;
return 1 ;
errw:
fd_close(fdw) ;
unlink_void(tmp) ;
errr:
fd_close(fdr) ;
return -1 ;
errc:
fd_close(fdc) ;
return -1 ;
useit:
if (!cdb_init_fromfd(&s6dns_hosts_here, fdc))
{
fd_close(fdc) ;
return 0 ;
}
fd_close(fdc) ;
return 1 ;
}
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