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/* ISC license. */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <skalibs/bytestr.h>
#include <skalibs/uint16.h>
#include <skalibs/uint32.h>
#include <skalibs/cdb.h>
#include <skalibs/strerr2.h>
#include <skalibs/djbunix.h>
#define USAGE "s6-accessrules-fs-from-cdb dir cdbfile"
static char const *basedir ;
unsigned int basedirlen ;
static void cleanup ()
{
int e = errno ;
rm_rf(basedir) ;
errno = e ;
}
static int domkdir (char const *s)
{
return mkdir(s, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH | S_ISGID) < 0 ? (errno == EEXIST) : 1 ;
}
static void mkdirp (char *s)
{
mode_t m = umask(0) ;
unsigned int len = str_len(s) ;
register unsigned int i = basedirlen + 1 ;
for (; i < len ; i++) if (s[i] == '/')
{
s[i] = 0 ;
if (!domkdir(s)) goto err ;
s[i] = '/' ;
}
if (!domkdir(s)) goto err ;
umask(m) ;
return ;
err:
cleanup() ;
strerr_diefu2sys(111, "mkdir ", s) ;
}
static void touchtrunc (char const *file)
{
register int fd = open_trunc(file) ;
if (fd < 0) strerr_diefu2sys(111, "open_trunc ", file) ;
fd_close(fd) ;
}
static int doenv (char const *dir, unsigned int dirlen, char *env, unsigned int envlen)
{
mode_t m = umask(0) ;
unsigned int i = 0 ;
if (!domkdir(dir))
{
cleanup() ;
strerr_diefu2sys(111, "mkdir ", dir) ;
}
umask(m) ;
while (i < envlen)
{
unsigned int n = byte_chr(env + i, envlen - i, 0) ;
if (i + n >= envlen) return 0 ;
{
unsigned int p = byte_chr(env + i, n, '=') ;
char tmp[dirlen + p + 2] ;
byte_copy(tmp, dirlen, dir) ;
tmp[dirlen] = '/' ;
byte_copy(tmp + dirlen + 1, p, env + i) ;
tmp[dirlen + p + 1] = 0 ;
if (p < n)
{
env[i+n] = '\n' ;
if (!openwritenclose_unsafe(tmp, env + i + p + 1, n - p))
{
cleanup() ;
strerr_diefu2sys(111, "openwritenclose_unsafe ", tmp) ;
}
}
else touchtrunc(tmp) ;
}
i += n + 1 ;
}
return 1 ;
}
static int doit (struct cdb *c)
{
unsigned int klen = cdb_keylen(c) ;
unsigned int dlen = cdb_datalen(c) ;
{
uint16 envlen, execlen ;
char name[basedirlen + klen + 8] ;
char data[dlen] ;
byte_copy(name, basedirlen, basedir) ;
name[basedirlen] = '/' ;
if (!dlen || (dlen > 8201)) return (errno = EINVAL, 0) ;
if ((cdb_read(c, name+basedirlen+1, klen, cdb_keypos(c)) < 0)
|| (cdb_read(c, data, dlen, cdb_datapos(c)) < 0))
{
cleanup() ;
strerr_diefu1sys(111, "cdb_read") ;
}
name[basedirlen + klen + 1] = 0 ;
mkdirp(name) ;
name[basedirlen + klen + 1] = '/' ;
if (data[0] == 'A')
{
byte_copy(name + basedirlen + klen + 2, 6, "allow") ;
touchtrunc(name) ;
}
else if (data[0] == 'D')
{
byte_copy(name + basedirlen + klen + 2, 5, "deny") ;
touchtrunc(name) ;
}
if (dlen < 3) return 1 ;
uint16_unpack_big(data + 1, &envlen) ;
if ((envlen > 4096U) || (3U + envlen > dlen)) return (errno = EINVAL, 0) ;
uint16_unpack_big(data + 3 + envlen, &execlen) ;
if ((execlen > 4096U) || (5U + envlen + execlen != dlen)) return (errno = EINVAL, 0) ;
if (envlen)
{
byte_copy(name + basedirlen + klen + 2, 4, "env") ;
if (!doenv(name, basedirlen + klen + 5, data + 3, envlen)) return (errno = EINVAL, 0) ;
}
byte_copy(name + basedirlen + klen + 2, 5, "exec") ;
if (execlen && !openwritenclose_unsafe(name, data + 5 + envlen, execlen))
{
cleanup() ;
strerr_diefu2sys(111, "openwritenclose_unsafe ", name) ;
}
}
return 1 ;
}
int main (int argc, char const *const *argv)
{
struct cdb c = CDB_ZERO ;
uint32 kpos ;
PROG = "s6-accessrules-fs-from-cdb" ;
if (argc < 3) strerr_dieusage(100, USAGE) ;
if (cdb_mapfile(&c, argv[2]) < 0) strerr_diefu1sys(111, "cdb_mapfile") ;
basedir = argv[1] ;
basedirlen = str_len(argv[1]) ;
{
mode_t m = umask(0) ;
if (mkdir(basedir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH | S_ISGID) < 0)
strerr_diefu2sys(111, "mkdir ", basedir) ;
umask(m) ;
}
cdb_traverse_init(&c, &kpos) ;
for (;;)
{
register int r = cdb_nextkey(&c, &kpos) ;
if (r < 0)
{
cleanup() ;
strerr_diefu1sys(111, "cdb_nextkey") ;
}
else if (!r) break ;
else if (!doit(&c))
{
cleanup() ;
strerr_diefu1sys(111, "handle key") ;
}
}
return 0 ;
}
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