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/* ISC license. */
#include <skalibs/nonposix.h>
#include <sys/socket.h>
#include <errno.h>
#include <signal.h>
#include <skalibs/uint.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/sgetopt.h>
#include <skalibs/error.h>
#include <skalibs/iobuffer.h>
#include <skalibs/sig.h>
#include <skalibs/selfpipe.h>
#include <skalibs/strerr2.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#define USAGE "s6-ioconnect [ -t timeout ] [ -r fdr ] [ -w fdw ] [ -0 ] [ -1 ] [ -6 ] [ -7 ]"
#define dieusage() strerr_dieusage(100, USAGE)
typedef struct ioblah_s ioblah_t, *ioblah_t_ref ;
struct ioblah_s
{
unsigned int fd ;
unsigned int xindex ;
unsigned int flagsocket : 1 ;
unsigned int flagopen : 1 ;
} ;
static ioblah_t a[2][2] = { { { 0, 4, 0, 1 }, { 7, 4, 0, 1 } }, { { 6, 4, 0, 1 }, { 1, 4, 0, 1 } } } ;
static iobuffer b[2] ;
static iopause_fd x[5] = { { -1, IOPAUSE_READ, 0 } } ;
static void closeit (unsigned int i, unsigned int j)
{
if (a[i][j].flagsocket)
{
if ((shutdown(a[i][j].fd, j) < 0) && (errno != ENOTSOCK) && (errno != ENOTCONN))
strerr_warnwu4sys("shutdown ", i ? "incoming" : "outgoing", " socket for ", j ? "writing" : "reading") ;
}
fd_close(a[i][j].fd) ;
a[i][j].flagopen = 0 ;
a[i][j].xindex = 5 ;
}
static inline void finishit (unsigned int i)
{
closeit(i, 1) ;
iobuffer_finish(&b[i]) ;
}
static void handle_signals (void)
{
for (;;)
{
switch (selfpipe_read())
{
case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
case 0 : return ;
case SIGTERM :
{
if (a[0][0].xindex < 5) x[a[0][0].xindex].revents |= IOPAUSE_EXCEPT ;
if (a[1][0].xindex < 5) x[a[1][0].xindex].revents |= IOPAUSE_EXCEPT ;
break ;
}
default :
strerr_dief1x(101, "internal error: inconsistent signal state. Please submit a bug-report.") ;
}
}
}
int main (int argc, char const *const *argv)
{
tain_t tto ;
register unsigned int i, j ;
PROG = "s6-ioconnect" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
unsigned int t = 0 ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "0167t:r:w:", &l) ;
if (opt < 0) break ;
switch (opt)
{
case '0' : a[0][0].flagsocket = 1 ; break ;
case '1' : a[1][1].flagsocket = 1 ; break ;
case '6' : a[1][0].flagsocket = 1 ; break ;
case '7' : a[0][1].flagsocket = 1 ; break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
case 'r' : if (!uint0_scan(l.arg, &a[1][0].fd)) dieusage() ; break ;
case 'w' : if (!uint0_scan(l.arg, &a[0][1].fd)) dieusage() ; break ;
default : dieusage() ;
}
}
if (t) tain_from_millisecs(&tto, t) ; else tto = tain_infinite_relative ;
argc -= l.ind ; argv += l.ind ;
}
if ((a[0][1].fd < 3) || (a[1][0].fd < 3)) dieusage() ;
for (i = 0 ; i < 2 ; i++)
{
for (j = 0 ; j < 2 ; j++)
if (ndelay_on(a[i][j].fd) == -1) strerr_diefu1sys(111, "ndelay_on") ;
if (!iobuffer_init(&b[i], a[i][0].fd, a[i][1].fd)) strerr_diefu1sys(111, "iobuffer_init") ;
}
if (sig_ignore(SIGPIPE) == -1) strerr_diefu1sys(111, "sig_ignore") ;
tain_now_g() ;
x[0].fd = selfpipe_init() ;
if (x[0].fd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
if (selfpipe_trap(SIGTERM) < 0)
strerr_diefu1sys(111, "trap SIGTERM") ;
for (;;)
{
tain_t deadline ;
unsigned int xlen = 1 ;
int r ;
tain_add_g(&deadline, iobuffer_isempty(&b[0]) && iobuffer_isempty(&b[1]) ? &tto : &tain_infinite_relative) ;
for (i = 0 ; i < 2 ; i++)
{
a[i][0].xindex = 5 ;
if (a[i][0].flagopen && iobuffer_isreadable(&b[i]))
{
x[xlen].fd = a[i][0].fd ;
x[xlen].events = IOPAUSE_READ ;
a[i][0].xindex = xlen++ ;
}
a[i][1].xindex = 5 ;
if (a[i][1].flagopen)
{
x[xlen].fd = a[i][1].fd ;
x[xlen].events = IOPAUSE_EXCEPT | (iobuffer_isempty(&b[i]) ? 0 : IOPAUSE_WRITE) ;
a[i][1].xindex = xlen++ ;
}
}
if (xlen <= 1) break ;
r = iopause_g(x, xlen, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
else if (!r) return 1 ;
if (x[0].revents & IOPAUSE_READ) handle_signals() ;
for (i = 0 ; i < 2 ; i++) if (a[i][1].xindex < 5)
{
if (x[a[i][1].xindex].revents & IOPAUSE_WRITE)
{
if (!iobuffer_flush(&b[i]))
{
if (!error_isagain(errno)) x[a[i][1].xindex].revents |= IOPAUSE_EXCEPT ;
}
else if (!a[i][0].flagopen) finishit(i) ;
}
if (x[a[i][1].xindex].revents & IOPAUSE_EXCEPT)
{
if (!iobuffer_isempty(&b[i]))
{
iobuffer_flush(&b[i]) ; /* sets errno */
strerr_warnwu3sys("write ", i ? "incoming" : "outgoing", " data") ;
}
closeit(i, 0) ; finishit(i) ;
}
}
for (i = 0 ; i < 2 ; i++) if (a[i][0].xindex < 5)
{
if (x[a[i][0].xindex].revents & IOPAUSE_READ)
{
if (sanitize_read(iobuffer_fill(&b[i])) < 0)
{
if (errno != EPIPE) strerr_warnwu3sys("read ", i ? "incoming" : "outgoing", " data") ;
x[a[i][0].xindex].revents |= IOPAUSE_EXCEPT ;
}
}
if (x[a[i][0].xindex].revents & IOPAUSE_EXCEPT)
{
closeit(i, 0) ;
if (iobuffer_isempty(&b[i])) finishit(i) ;
}
}
}
return 0 ;
}
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