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/* ISC license. */
#include <errno.h>
#include <signal.h>
#include <sys/stat.h>
#include <skalibs/types.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/sgetopt.h>
#include <skalibs/error.h>
#include <skalibs/buffer.h>
#include <skalibs/sig.h>
#include <skalibs/selfpipe.h>
#include <skalibs/strerr.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#define USAGE "s6-ioconnect [ -t timeout ] [ -r fdr ] [ -w fdw ]"
#define dieusage() strerr_dieusage(100, USAGE)
#define BSIZE 8192
typedef struct ioblah_s ioblah, *ioblah_ref ;
struct ioblah_s
{
buffer b ;
unsigned int xindex ;
unsigned int flagsocket : 1 ;
} ;
static char buf[2][BSIZE] = { { '\0' }, { '\0' } } ;
static ioblah a[2][2] =
{
{
{ .b = BUFFER_INIT(&buffer_read, 0, buf[0], BSIZE), .xindex = 5 },
{ .b = BUFFER_INIT(&buffer_write, 7, buf[0], BSIZE), .xindex = 5 }
},
{
{ .b = BUFFER_INIT(&buffer_read, 6, buf[1], BSIZE), .xindex = 5 },
{ .b = BUFFER_INIT(&buffer_write, 1, buf[1], BSIZE), .xindex = 5 }
}
} ;
static iopause_fd x[5] = { [0] = { .fd = -1, .events = IOPAUSE_READ } } ;
static void closeit (unsigned int i, unsigned int j)
{
int fd = buffer_fd(&a[i][j].b) ;
if (a[i][j].flagsocket) fd_shutdown(fd, j) ;
fd_close(fd) ;
buffer_fd(&a[i][j].b) = -1 ;
a[i][j].xindex = 5 ;
}
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.") ;
}
}
}
static int flushit (unsigned int i)
{
int r = buffer_flush(&a[i][1].b) ;
a[i][0].b.c.p = a[i][1].b.c.p ; /* XXX: abstraction leak */
return r ;
}
static int fillit (unsigned int i)
{
ssize_t r = sanitize_read(buffer_fill(&a[i][0].b)) ;
a[i][1].b.c.n = a[i][0].b.c.n ; /* XXX: abstraction leak */
return r >= 0 ;
}
int main (int argc, char const *const *argv)
{
tain tto ;
unsigned int i, j ;
PROG = "s6-ioconnect" ;
{
subgetopt l = SUBGETOPT_ZERO ;
unsigned int t = 0 ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "0167t:r:w:", &l) ;
if (opt < 0) break ;
switch (opt)
{
case '0' : break ; /* these options are deprecated */
case '1' : break ; /* only there for compatibility */
case '6' : break ; /* flagsocket is autodetected now */
case '7' : break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
case 'r' : if (!int0_scan(l.arg, &buffer_fd(&a[1][0].b))) dieusage() ; break ;
case 'w' : if (!int0_scan(l.arg, &buffer_fd(&a[0][1].b))) dieusage() ; break ;
default : dieusage() ;
}
}
if (t) tain_from_millisecs(&tto, t) ; else tto = tain_infinite_relative ;
argc -= l.ind ; argv += l.ind ;
}
if ((buffer_fd(&a[0][1].b) < 3) || (buffer_fd(&a[1][0].b) < 3)) dieusage() ;
for (i = 0 ; i < 2 ; i++) for (j = 0 ; j < 2 ; j++)
{
int fd = buffer_fd(&a[i][j].b) ;
struct stat st ;
if (fstat(fd, &st) == -1)
{
char fmt[INT_FMT] ;
fmt[int_fmt(fmt, fd)] = 0 ;
strerr_diefu2sys(111, "fstat fd ", fmt) ;
}
a[i][j].flagsocket = !!S_ISSOCK(st.st_mode) ;
if (ndelay_on(fd) == -1)
{
char fmt[INT_FMT] ;
fmt[int_fmt(fmt, fd)] = 0 ;
strerr_diefu3sys(111, "set fd ", fmt, " non-blocking") ;
}
}
if (!sig_ignore(SIGPIPE)) strerr_diefu1sys(111, "ignore SIGPIPE") ;
tain_now_set_stopwatch_g() ;
x[0].fd = selfpipe_init() ;
if (x[0].fd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
if (!selfpipe_trap(SIGTERM))
strerr_diefu1sys(111, "trap SIGTERM") ;
for (;;)
{
tain deadline ;
unsigned int xlen = 1 ;
tain_add_g(&deadline, buffer_isempty(&a[0][1].b) && buffer_isempty(&a[1][1].b) ? &tto : &tain_infinite_relative) ;
for (i = 0 ; i < 2 ; i++)
{
if (buffer_fd(&a[i][0].b) >= 0 && buffer_isreadable(&a[i][0].b))
{
x[xlen].fd = buffer_fd(&a[i][0].b) ;
x[xlen].events = IOPAUSE_READ ;
a[i][0].xindex = xlen++ ;
}
else a[i][0].xindex = 5 ;
if (buffer_fd(&a[i][1].b) >= 0)
{
x[xlen].fd = buffer_fd(&a[i][1].b) ;
x[xlen].events = IOPAUSE_EXCEPT | (buffer_iswritable(&a[i][1].b) ? IOPAUSE_WRITE : 0) ;
a[i][1].xindex = xlen++ ;
}
else a[i][1].xindex = 5 ;
}
if (xlen == 1) break ;
{
int 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)
{
int dead = 0 ;
if (x[a[i][1].xindex].revents & IOPAUSE_EXCEPT)
{
if (!buffer_isempty(&a[i][1].b))
{
char fmt[INT_FMT] ;
fmt[int_fmt(fmt, buffer_fd(&a[i][1].b))] = 0 ;
flushit(i) ; /* sets errno */
strerr_warnwu2sys("write to fd ", fmt) ;
}
dead = 1 ;
}
else if (x[a[i][1].xindex].revents & IOPAUSE_WRITE)
{
if (!flushit(i))
{
if (!error_isagain(errno)) dead = 1 ;
}
else if (buffer_fd(&a[i][0].b) == -1) dead = 1 ;
}
if (dead)
{
if (buffer_fd(&a[i][0].b) >= 0) closeit(i, 0) ;
closeit(i, 1) ;
}
}
for (i = 0 ; i < 2 ; i++) if (a[i][0].xindex < 5)
{
if (x[a[i][0].xindex].revents & (IOPAUSE_READ | IOPAUSE_EXCEPT))
{
if (!fillit(i))
{
if (errno != EPIPE)
{
char fmt[INT_FMT] ;
fmt[int_fmt(fmt, buffer_fd(&a[i][0].b))] = 0 ;
strerr_warnwu2sys("read from fd ", fmt) ;
}
closeit(i, 0) ;
if (buffer_isempty(&a[i][1].b)) closeit(i, 1) ;
}
}
}
}
return 0 ;
}
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