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/* ISC license. */
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr2.h>
#include <s6/s6-supervise.h>
#define USAGE "s6-svperms [ -v ] [ -u | -g group | -G group | -o | -O group ] [ -e | -E group ] servicedir..."
#define dieusage() strerr_dieusage(100, USAGE)
static gid_t scangid (char const *s)
{
if (s[0] == ':')
{
gid_t g ;
if (!gid0_scan(s+1, &g)) dieusage() ;
return g ;
}
else
{
struct group *gr ;
errno = 0 ;
gr = getgrnam(s) ;
if (!gr)
{
if (errno) strerr_diefu1sys(111, "getgrnam") ;
else strerr_diefu3x(100, "find entry for ", s, " in group database") ;
}
return gr->gr_gid ;
}
}
static char *gidname (gid_t gid)
{
struct group *gr ;
errno = 0 ;
gr = getgrgid(gid) ;
if (!gr)
{
static char fmt[GID_FMT] ;
fmt[gid_fmt(fmt, gid)] = 0 ;
if (errno) strerr_warnwu2sys("getgrgid ", fmt) ;
return fmt ;
}
return gr->gr_name ;
}
static void out (char const *s)
{
if (buffer_puts(buffer_1, s) < 0)
strerr_diefu1sys(111, "write to stdout") ;
}
static inline int printsupervise (char const *dir)
{
struct stat st ;
size_t len = strlen(dir) ;
char fn[len + sizeof(S6_SUPERVISE_CTLDIR) + 9] ;
memcpy(fn, dir, len) ;
memcpy(fn + len, "/" S6_SUPERVISE_CTLDIR, sizeof(S6_SUPERVISE_CTLDIR) + 1) ;
if (stat(fn, &st) < 0)
{
strerr_warnwu2sys("stat ", fn) ;
return 1 ;
}
if (!S_ISDIR(st.st_mode))
{
strerr_warnw2x(fn, " is not a directory") ;
return 1 ;
}
if (st.st_mode & 05066 || (st.st_mode & 0700) != 0700 || ((st.st_mode & 0001) && !(st.st_mode & 0010)))
{
char fmt[UINT_OFMT] ;
fmt[uint_ofmt(fmt, st.st_mode & 07777)] = 0 ;
strerr_warnw3x(fn, " has incorrect permissions: ", fmt) ;
return 1 ;
}
out(dir) ;
out(" status: ") ;
if (st.st_mode & 0011)
{
if (st.st_mode & 0001) buffer_puts(buffer_1, "public") ;
else
{
out("group ") ;
out(gidname(st.st_gid)) ;
}
}
else out("owner") ;
out("\n") ;
memcpy(fn + len + sizeof(S6_SUPERVISE_CTLDIR), "/control", 9) ;
if (stat(fn, &st) < 0)
{
strerr_warnwu2sys("stat ", fn) ;
return 1 ;
}
if (!S_ISFIFO(st.st_mode))
{
strerr_warnw2x(fn, " is not a named pipe") ;
return 1 ;
}
if (st.st_mode & 0157)
{
char fmt[UINT_OFMT] ;
fmt[uint_ofmt(fmt, st.st_mode & 07777)] = 0 ;
strerr_warnw3x(fn, " has incorrect permissions: ", fmt) ;
return 1 ;
}
out(dir) ;
out(" control: ") ;
if (st.st_mode & 0020)
{
out("group ") ;
out(gidname(st.st_gid)) ;
}
else out("owner") ;
out("\n") ;
return 0 ;
}
static inline int printevent (char const *dir)
{
struct stat st ;
size_t len = strlen(dir) ;
char fn[len + sizeof(S6_SUPERVISE_EVENTDIR) + 1] ;
memcpy(fn, dir, len) ;
memcpy(fn + len, "/" S6_SUPERVISE_EVENTDIR, sizeof(S6_SUPERVISE_EVENTDIR) + 1) ;
if (stat(fn, &st) < 0)
{
strerr_warnwu2sys("stat ", fn) ;
return 1 ;
}
if (!S_ISDIR(st.st_mode))
{
strerr_warnw2x(fn, " is not a directory") ;
return 1 ;
}
if ((st.st_mode & 07777) != 01733 && (st.st_mode & 07777) != 03730)
{
char fmt[UINT_OFMT] ;
fmt[uint_ofmt(fmt, st.st_mode & 07777)] = 0 ;
strerr_warnw3x(fn, " has incorrect permissions: ", fmt) ;
return 1 ;
}
out(dir) ;
out(" events: ") ;
if ((st.st_mode & 07777) == 03730)
{
out("group ") ;
out(gidname(st.st_gid)) ;
}
else out("public") ;
out("\n") ;
return 0 ;
}
static gid_t primarygid (char const *fn)
{
struct passwd *pw ;
struct stat st ;
if (stat(fn, &st) < 0) strerr_diefu2sys(111, "stat ", fn) ;
errno = 0 ;
pw = getpwuid(st.st_uid) ;
if (!pw)
{
strerr_warnwu3sys("determine primary gid for the owner of ", fn, " (using root instead)") ;
return 0 ;
}
else return pw->pw_gid ;
}
static inline void modsupervise (char const *dir, unsigned int what, gid_t gid)
{
size_t len = strlen(dir) ;
gid_t cgid = 0 ;
mode_t mode = 0700 ;
char fn[len + sizeof(S6_SUPERVISE_CTLDIR) + 9] ;
memcpy(fn, dir, len) ;
memcpy(fn + len, "/" S6_SUPERVISE_CTLDIR, sizeof(S6_SUPERVISE_CTLDIR) + 1) ;
switch (what & 3)
{
case 0 : cgid = primarygid(fn) ; mode = 0700 ; break ;
case 1 : cgid = gid ; mode = 0710 ; break ;
case 2 : cgid = primarygid(fn) ; mode = 0711 ; break ;
}
if (chown(fn, -1, cgid) < 0)
strerr_diefu2sys(111, "chown ", fn) ;
if (chmod(fn, mode) < 0)
strerr_diefu2sys(111, "chmod ", fn) ;
memcpy(fn + len + sizeof(S6_SUPERVISE_CTLDIR), "/control", 9) ;
if (what & 4) mode = 0620 ;
else
{
gid = primarygid(fn) ;
mode = 0600 ;
}
if (chown(fn, -1, gid) < 0)
strerr_diefu2sys(111, "chown ", fn) ;
if (chmod(fn, mode) < 0)
strerr_diefu2sys(111, "chmod ", fn) ;
}
static inline void modevent (char const *dir, gid_t gid)
{
size_t len = strlen(dir) ;
mode_t mode ;
char fn[len + sizeof(S6_SUPERVISE_EVENTDIR) + 1] ;
memcpy(fn, dir, len) ;
memcpy(fn + len, "/" S6_SUPERVISE_EVENTDIR, sizeof(S6_SUPERVISE_EVENTDIR) + 1) ;
if (gid == (gid_t)-1)
{
gid = primarygid(fn) ;
mode = 01733 ;
}
else mode = 03730 ;
if (chown(fn, -1, gid) < 0)
strerr_diefu2sys(111, "chown ", fn) ;
if (chmod(fn, mode) < 0)
strerr_diefu2sys(111, "chmod ", fn) ;
}
int main (int argc, char const *const *argv)
{
int e = 0 ;
gid_t gid = -1 ;
gid_t eventgid = -1 ;
int rw = 0 ;
unsigned int what = 0 ;
PROG = "s6-svperms" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "vug:G:oO:eE:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'v' : rw |= 1 ; break ;
case 'u' : rw |= 2 ; what = 0 ; break ;
case 'g' : rw |= 2 ; what = 1 ; gid = scangid(l.arg) ; break ;
case 'G' : rw |= 2 ; what = 5 ; gid = scangid(l.arg) ; break ;
case 'o' : rw |= 2 ; what = 2 ; break ;
case 'O' : rw |= 2 ; what = 6 ; gid = scangid(l.arg) ; break ;
case 'e' : rw |= 4 ; eventgid = -1 ; break ;
case 'E' : rw |= 4 ; eventgid = scangid(l.arg) ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) dieusage() ;
if (!rw) rw = 1 ;
for (; *argv ; argv++)
{
if (rw & 2) modsupervise(*argv, what, gid) ;
if (rw & 4) modevent(*argv, eventgid) ;
if (rw & 1) { e |= printsupervise(*argv) ; e |= printevent(*argv) ; }
}
if (rw & 1 && !buffer_flush(buffer_1))
strerr_diefu1sys(111, "write to stdout") ;
return e ;
}
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