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/* ISC license. */
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <skalibs/uint64.h>
#include <skalibs/types.h>
#include <skalibs/bytestr.h>
#include <skalibs/envexec.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <skalibs/socket.h>
#define USAGE "s6-notify-socket-from-fd [ -d fd ] [ -f ] [ -t timeout ] [ -k ] prog..."
#define dieusage() strerr_dieusage(100, USAGE)
#define VAR "NOTIFY_SOCKET"
enum golb_e
{
GOLB_SINGLEFORK = 0x01,
GOLB_KEEP = 0x02,
} ;
enum gola_e
{
GOLA_NOTIF,
GOLA_TIMEOUT,
GOLA_N
} ;
static inline int ipc_sendto (int fd, char const *s, size_t len, char const *path)
{
struct sockaddr_un sa ;
size_t l = strlen(path) ;
if (l > IPCPATH_MAX) return (errno = ENAMETOOLONG, 0) ;
memset(&sa, 0, sizeof sa) ;
sa.sun_family = AF_UNIX ;
memcpy(sa.sun_path, path, l+1) ;
if (path[0] == '@') sa.sun_path[0] = 0 ;
return sendto(fd, s, len, MSG_NOSIGNAL, (struct sockaddr *)&sa, sizeof sa) >= 0 ;
}
static inline void notify_systemd (pid_t pid, char const *socketpath)
{
size_t n = 16 ;
char fmt[16 + PID_FMT] = "READY=1\nMAINPID=" ;
int fd = ipc_datagram_b() ;
if (fd == -1) strerr_diefu1sys(111, "create socket") ;
n += pid_fmt(fmt + n, pid) ;
fmt[n++] = '\n' ;
if (!ipc_sendto(fd, fmt, n, socketpath))
strerr_diefu2sys(111, "send notification message to ", socketpath) ;
fd_close(fd) ;
}
static inline int run_child (int fd, unsigned int timeout, pid_t pid, char const *s)
{
char dummy[4096] ;
iopause_fd x = { .fd = fd, .events = IOPAUSE_READ } ;
tain deadline = TAIN_INFINITE_RELATIVE ;
tain_now_g() ;
if (timeout) tain_from_millisecs(&deadline, timeout) ;
tain_add_g(&deadline, &deadline) ;
for (;;)
{
int r = iopause_g(&x, 1, &deadline) ;
if (r == -1) strerr_diefu1sys(111, "iopause") ;
if (!r) return 99 ;
r = sanitize_read(fd_read(fd, dummy, 4096)) ;
if (r < 0)
if (errno == EPIPE) return 1 ;
else strerr_diefu1sys(111, "read from parent") ;
else if (r && memchr(dummy, '\n', r)) break ;
}
fd_close(fd) ;
notify_systemd(pid, s) ;
return 0 ;
}
int main (int argc, char const *const *argv)
{
static gol_bool const rgolb[] =
{
{ .so = 0, .lo = "doublefork", .clear = GOLB_SINGLEFORK, .set = 0 },
{ .so = 'f', .lo = "no-doublefork", .clear = 0, .set = GOLB_SINGLEFORK },
{ .so = 'k', .lo = "keep-environment", .clear = 0, .set = GOLB_KEEP },
} ;
static gol_arg const rgola[] =
{
{ .so = 'd', .lo = "notification-fd", .i = GOLA_NOTIF },
{ .so = 't', .lo = "timeout", .i = GOLA_TIMEOUT },
} ;
char const *s = getenv(VAR) ;
unsigned int fd = 1 ;
unsigned int timeout = 0 ;
uint64_t wgolb = 0 ;
char const *wgola[GOLA_N] = { 0 } ;
unsigned int golc ;
PROG = "s6-notify-socket-from-fd" ;
golc = GOL_main(argc, argv, rgolb, rgola, &wgolb, wgola) ;
argc -= golc ; argv += golc ;
if (!argc) dieusage() ;
if (wgola[GOLA_NOTIF] && !uint0_scan(wgola[GOLA_NOTIF], &fd))
strerr_dief2x(100, "notification-fd", " must be an unsigned integer") ;
if (wgola[GOLA_TIMEOUT] && !uint0_scan(wgola[GOLA_TIMEOUT], &timeout))
strerr_dief2x(100, "timeout", " must be an unsigned integer") ;
if (!s) xexec(argv) ;
else
{
pid_t parent = getpid() ;
pid_t child ;
int p[2] ;
if (pipe(p) == -1) strerr_diefu1sys(111, "pipe") ;
child = wgolb & GOLB_SINGLEFORK ? fork() : doublefork() ;
if (child == -1) strerr_diefu1sys(111, wgolb & GOLB_SINGLEFORK ? "fork" : "doublefork") ;
else if (!child)
{
PROG = "s6-notify-socket-from-fd (child)" ;
fd_close(p[1]) ;
return run_child(p[0], timeout, parent, s) ;
}
fd_close(p[0]) ;
if (fd_move(fd, p[1]) == -1) strerr_diefu1sys(111, "fd_move") ;
if (wgolb & GOLB_KEEP) xexec(argv) ;
else xmexec_n(argv, VAR, sizeof(VAR), 1) ;
}
}
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