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/* ISC license. */
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#include <errno.h>
#include <sys/stat.h>
#include <skalibs/bitarray.h>
#include <skalibs/tai.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#include <s6/ftrigr.h>
#include <s6/ftrigw.h>
#include <s6/s6-supervise.h>
static inline void do_unlink (char const *scdir, char const *prefix, size_t prefixlen, size_t maxlen, char const *names, size_t nameslen, uint32_t killopts)
{
char fn[prefixlen + maxlen + 1] ;
memcpy(fn, prefix, prefixlen) ;
while (nameslen)
{
size_t len = strlen(names) + 1 ;
memcpy(fn + prefixlen, names, len) ;
s6_supervise_unlink(scdir, fn, killopts) ;
names += len ; nameslen -= len ;
}
}
static uint16_t registerit (ftrigr_t *a, char *fn, size_t len, gid_t gid, uint32_t options, tain_t const *deadline, tain_t *stamp)
{
if (options & 4)
{
int fd ;
memcpy(fn + len, "/down", 6) ;
fd = open_trunc(fn) ;
if (fd < 0) return 0 ;
fd_close(fd) ;
}
memcpy(fn + len, "/" S6_SUPERVISE_EVENTDIR, 1 + sizeof(S6_SUPERVISE_EVENTDIR)) ;
if (!ftrigw_fifodir_make(fn, gid, options & 1)) return 0 ;
return ftrigr_subscribe(a, fn, "s", 0, deadline, stamp) ;
}
int s6_supervise_link (char const *scdir, char const *const *servicedirs, size_t n, char const *prefix, uint32_t options, tain_t const *deadline, tain_t *stamp)
{
size_t maxlen = 0 ;
size_t ntotal = n ;
unsigned char locked[bitarray_div8(n)] ;
unsigned char logged[bitarray_div8(n)] ;
if (!n) return 0 ;
memset(locked, 0, bitarray_div8(n)) ;
memset(logged, 0, bitarray_div8(n)) ;
for (size_t i = 0 ; i < n ; i++)
{
struct stat st ;
size_t len = strlen(servicedirs[i]) ;
int h ;
char subdir[len + 5] ;
if (len > maxlen) maxlen = len ;
h = s6_svc_ok(servicedirs[i]) ;
if (h < 0) return -1 ;
if (h) bitarray_set(locked, i) ;
memcpy(subdir, servicedirs[i], len) ;
memcpy(subdir + len, "/log", 5) ;
if (stat(subdir, &st) < 0)
{
if (errno != ENOENT) return -1 ;
}
else
{
int r ;
if (!S_ISDIR(st.st_mode)) return (errno = ENOTDIR, -1) ;
r = s6_svc_ok(subdir) ;
if (r < 0) return -1 ;
if (r != h) return (errno = EINVAL, -1) ;
bitarray_set(logged, i) ;
ntotal++ ;
}
}
{
stralloc lnames = STRALLOC_ZERO ;
ftrigr_t a = FTRIGR_ZERO ;
stralloc rpsa = STRALLOC_ZERO ;
gid_t gid = options & 2 ? -1 : getegid() ;
size_t scdirlen = strlen(scdir) ;
size_t prefixlen = strlen(prefix) ;
unsigned int m = 0 ;
size_t i = 0 ;
size_t lstart = 0 ;
uint32_t killopts = 0 ;
int r ;
uint16_t ids[ntotal] ;
char lname[scdirlen + prefixlen + maxlen + 2] ;
char fn[maxlen + 5 + (sizeof(S6_SUPERVISE_EVENTDIR) > 5 ? sizeof(S6_SUPERVISE_EVENTDIR) : 5)] ;
if (!ftrigr_startf(&a, deadline, stamp)) return -1 ;
memcpy(lname, scdir, scdirlen) ;
lname[scdirlen] = '/' ;
memcpy(lname + scdirlen + 1, prefix, prefixlen) ;
for (i = 0 ; i < n ; i++)
{
char *p ;
char const *src ;
size_t len = strlen(servicedirs[i]) ;
int h = bitarray_peek(locked, i) ;
memcpy(fn, servicedirs[i], len) ;
if (!h)
{
ids[m] = registerit(&a, fn, len, gid, options, deadline, stamp) ;
if (!ids[m++]) goto err ;
if (bitarray_peek(logged, i))
{
memcpy(fn + len, "/log", 4) ;
ids[m] = registerit(&a, fn, len + 4, gid, options, deadline, stamp) ;
if (!ids[m++]) goto err ;
}
}
fn[len] = 0 ;
p = basename(fn) ;
len = strlen(p) ;
memcpy(lname + scdirlen + 1 + prefixlen, p, len + 1) ;
lstart = lnames.len ;
if (!h && !stralloc_catb(&lnames, p, len + 1)) goto err ;
if (servicedirs[i][0] == '/') src = servicedirs[i] ;
else
{
rpsa.len = 0 ;
if (sarealpath(&rpsa, servicedirs[i]) < 0 || !stralloc_0(&rpsa)) goto errl ;
src = rpsa.s ;
}
if (symlink(src, lname) < 0 && (!h || errno != EEXIST)) goto errl ;
}
stralloc_free(&rpsa) ;
r = s6_svc_writectl(scdir, S6_SVSCAN_CTLDIR, "a", 1) ;
if (r <= 0) goto errsa ;
killopts = 3 ;
if (ftrigr_wait_and(&a, ids, m, deadline, stamp) < 0) goto errsa ;
ftrigr_end(&a) ;
stralloc_free(&lnames) ;
return m ;
errl:
lnames.len = lstart ;
err:
stralloc_free(&rpsa) ;
errsa:
ftrigr_end(&a) ;
do_unlink(scdir, prefix, prefixlen, maxlen, lnames.s, lnames.len, killopts | (options & 4)) ;
stralloc_free(&lnames) ;
return -1 ;
}
}
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