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/* ISC license. */
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <skalibs/posixplz.h>
#include <skalibs/types.h>
#include <skalibs/cdb_make.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/env.h>
#include <skalibs/direntry.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#define USAGE "s6-accessrules-cdb-from-fs cdbfile dir"
#define SUFFIX ":s6-accessrules-cdb-from-fs:XXXXXX"
static stralloc tmp = STRALLOC_ZERO ;
static void cleanup (void)
{
unlink_void(tmp.s) ;
}
static void dienomem (void)
{
cleanup() ;
strerr_diefu1sys(111, "stralloc_catb") ;
}
static void doit (struct cdb_make *c, stralloc *sa, size_t start)
{
size_t tmpbase = tmp.len ;
unsigned int k = sa->len ;
if (!stralloc_readyplus(sa, 10)) dienomem() ;
stralloc_catb(sa, "/allow", 7) ;
tmp.s[tmpbase] = 0 ;
if (access(sa->s, F_OK) < 0)
{
if ((errno != ENOENT) && (errno != EACCES))
{
cleanup() ;
strerr_diefu2sys(111, "access ", sa->s) ;
}
sa->len = k+1 ;
stralloc_catb(sa, "deny", 5) ;
if (access(sa->s, F_OK) < 0)
if ((errno != ENOENT) && (errno != EACCES))
{
cleanup() ;
strerr_diefu2sys(111, "access ", sa->s) ;
}
else return ;
else if (cdb_make_add(c, sa->s + start, k - start, "D", 1) < 0)
{
cleanup() ;
strerr_diefu1sys(111, "cdb_make_add") ;
}
}
else
{
uint16_t envlen = 0 ;
uint16_t execlen = 0 ;
ssize_t r ;
tmp.s[tmpbase] = 'A' ;
sa->len = k+1 ;
stralloc_catb(sa, "env", 4) ;
tmp.len = tmpbase + 3 ;
if ((envdir(sa->s, &tmp) < 0) && (errno != ENOENT))
{
cleanup() ;
strerr_diefu2sys(111, "envdir ", sa->s) ;
}
if (tmp.len > tmpbase + 4103)
{
cleanup() ;
strerr_dief2sys(100, sa->s, " too big") ;
}
envlen = tmp.len - tmpbase - 3 ;
tmp.len = tmpbase ;
uint16_pack_big(tmp.s + tmpbase + 1, envlen) ;
sa->len = k+1 ;
stralloc_catb(sa, "exec", 5) ;
r = openreadnclose(sa->s, tmp.s + tmpbase + 5 + envlen, 4096) ;
if ((r < 0) && (errno != ENOENT))
{
cleanup() ;
strerr_diefu2sys(111, "openreadnclose ", sa->s) ;
}
if (r > 0) execlen = r ;
if (execlen == 4096) strerr_warnw2x("possibly truncated file ", sa->s) ;
uint16_pack_big(tmp.s + tmpbase + 3 + envlen, execlen) ;
if (cdb_make_add(c, sa->s + start, k - start, tmp.s + tmpbase, 5 + envlen + execlen) < 0)
{
cleanup() ;
strerr_diefu1sys(111, "cdb_make_add") ;
}
}
}
int main (int argc, char const *const *argv)
{
stralloc sa = STRALLOC_ZERO ;
struct cdb_make c = CDB_MAKE_ZERO ;
DIR *dir ;
size_t start ;
int fd ;
PROG = "s6-accessrules-cdb-from-fs" ;
if (argc < 3) strerr_dieusage(100, USAGE) ;
if (!stralloc_cats(&tmp, argv[1])) return 0 ;
if (!stralloc_readyplus(&tmp, 8210))
strerr_diefu1sys(111, "stralloc_catb") ;
stralloc_catb(&tmp, SUFFIX, sizeof(SUFFIX)) ;
fd = mkstemp(tmp.s) ;
if (fd < 0) strerr_diefu2sys(111, "mkstemp ", tmp.s) ;
if (cdb_make_start(&c, fd) < 0)
{
cleanup() ;
strerr_diefu1sys(111, "cdb_make_start") ;
}
dir = opendir(argv[2]) ;
if (!dir)
{
cleanup() ;
strerr_diefu2sys(111, "opendir ", argv[2]) ;
}
if (!stralloc_cats(&sa, argv[2]) || !stralloc_catb(&sa, "/", 1)) dienomem() ;
start = sa.len ;
for (;;)
{
DIR *subdir ;
direntry *d ;
size_t base ;
errno = 0 ;
d = readdir(dir) ;
if (!d) break ;
if (d->d_name[0] == '.') continue ;
sa.len = start ;
if (!stralloc_cats(&sa, d->d_name) || !stralloc_0(&sa)) dienomem() ;
base = sa.len ;
subdir = opendir(sa.s) ;
if (!subdir)
{
cleanup() ;
strerr_diefu2sys(111, "opendir ", sa.s) ;
}
sa.s[base-1] = '/' ;
for (;;)
{
errno = 0 ;
d = readdir(subdir) ;
if (!d) break ;
if (d->d_name[0] == '.') continue ;
sa.len = base ;
if (!stralloc_cats(&sa, d->d_name)) dienomem() ;
doit(&c, &sa, start) ;
}
if (errno)
{
sa.s[base-1] = 0 ;
cleanup() ;
strerr_diefu2sys(111, "readdir ", sa.s) ;
}
dir_close(subdir) ;
}
if (errno)
{
cleanup() ;
strerr_diefu2sys(111, "readdir ", argv[2]) ;
}
dir_close(dir) ;
if (cdb_make_finish(&c) < 0)
{
cleanup() ;
strerr_diefu1sys(111, "cdb_make_finish") ;
}
if (fd_sync(fd) < 0)
{
cleanup() ;
strerr_diefu1sys(111, "fd_sync") ;
}
fd_close(fd) ;
if (rename(tmp.s, argv[1]) < 0)
{
cleanup() ;
strerr_diefu4sys(111, "rename ", tmp.s, " to ", argv[1]) ;
}
return 0 ;
}
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