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/* ISC license. */
#include <string.h>
#include <net/if.h>
#include <skalibs/strerr.h>
#include <skalibs/sgetopt.h>
#include <skalibs/types.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <bcnm/if.h>
#define USAGE "bcnm-waitif [ -u | -d ] [ -t timeout ] [ -k kbufsize ] mask interface..."
#define dieusage() strerr_dieusage(100, USAGE)
static inline int check (bcnm_if_link_state_t *tab, size_t n, unsigned int mask, int not)
{
size_t i = 0 ;
for (; i < n ; i++)
if ((tab[i].state & mask) != (not ? 0 : mask)) return 0 ;
return 1 ;
}
int main (int argc, char const *const *argv)
{
iopause_fd x = { .events = IOPAUSE_READ } ;
tain deadline, tto ;
int not = 0 ;
unsigned int mask = 1 ;
unsigned int kbufsize = 131072 ;
PROG = "bcnm-waitif" ;
{
subgetopt l = SUBGETOPT_ZERO ;
unsigned int t = 0 ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "udt:k:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'u' : not = 0 ; break ;
case 'd' : not = 1 ; break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
case 'k' : if (!uint0_scan(l.arg, &kbufsize)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (t) tain_from_millisecs(&tto, t) ;
else tto = tain_infinite_relative ;
}
if (argc < 2) dieusage() ;
if (!uint0_scan(*argv++, &mask))
strerr_dief2x(100, "invalid mask: ", argv[-1]) ;
x.fd = bcnm_if_link_init(kbufsize) ;
if (x.fd < 0) strerr_diefu1sys(111, "bcnm_if_link_init") ;
tain_now_set_stopwatch_g() ;
tain_add_g(&deadline, &tto) ;
{
size_t n = --argc ;
bcnm_if_link_state_t tab[n] ;
for (size_t i = 0 ; i < n ; i++)
{
int r ;
size_t len = strlen(argv[i]) ;
if (len >= IF_NAMESIZE - 1)
strerr_dief2x(100, "interface name too long: ", argv[i]) ;
memcpy(tab[i].ifname, argv[i], len+1) ;
tab[i].changed = 0 ;
r = bcnm_if_getstate(argv[i]) ;
if (r < 0) strerr_diefu2sys(111, "get state for interface ", argv[i]) ;
tab[i].state = r ;
}
for (;;)
{
int r ;
if (check(tab, n, mask, not)) return 0 ;
r = iopause_g(&x, 1, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
if (!r) strerr_dief1x(99, "timed out") ;
if (bcnm_if_link_event(x.fd, tab, n) < 0)
strerr_diefu1sys(111, "read rtnetlink event") ;
}
}
return 0 ;
}
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