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/* ISC license. */
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
#include <skalibs/gccattributes.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr.h>
#include <skalibs/djbunix.h>
#include <skalibs/socket.h>
#include <skalibs/exec.h>
#include <s6-networking/config.h>
#include "s6tls-internal.h"
#define USAGE "s6-ucspitlsc [ -S | -s ] [ -Y | -y ] [ -v verbosity ] [ -K timeout ] [ -Z | -z ] [ -k servername ] [ -6 fdr ] [ -7 fdw ] prog..."
#define dieusage() strerr_dieusage(100, USAGE)
static inline void child (int [4][2], uint32_t, unsigned int, unsigned int, char const *, pid_t) gccattr_noreturn ;
static inline void child (int p[4][2], uint32_t options, unsigned int verbosity, unsigned int kimeout, char const *servername, pid_t pid)
{
ssize_t r ;
char const *newargv[S6TLS_PREP_IO_ARGC] ;
char buf[S6TLS_PREP_IO_BUFLEN] ;
char c ;
PROG = "s6-ucspitlsc" ;
close(p[2][0]) ;
close(p[1][0]) ;
close(p[0][1]) ;
if (fd_move(0, p[3][0]) == -1 || fd_move(1, p[3][1]) == -1)
strerr_diefu1sys(111, "move network fds to stdin/stdout") ;
r = read(p[2][1], &c, 1) ;
if (r < 0) strerr_diefu1sys(111, "read from control socket") ;
if (!r)
{
if (verbosity >= 2)
{
char fmt[PID_FMT] ;
fmt[pid_fmt(fmt, pid)] = 0 ;
strerr_warni4x("pid ", fmt, " declined", " opportunistic TLS") ;
}
_exit(0) ;
}
switch (c)
{
case 'y' :
close(p[2][1]) ;
p[2][1] = 0 ; /* we know 0 is open so it's a suitable invalid value */
break ;
case 'Y' :
fd_shutdown(p[2][1], 0) ;
break ;
default :
strerr_dief1x(100, "unrecognized command on control socket") ;
}
s6tls_prep_tlscio(newargv, buf, p, options, verbosity, kimeout, servername) ;
if (verbosity >= 2)
{
char fmt[PID_FMT] ;
fmt[pid_fmt(fmt, pid)] = 0 ;
strerr_warni4x("pid ", fmt, " accepted", " opportunistic TLS") ;
}
xexec(newargv) ;
}
int main (int argc, char const *const *argv, char const *const *envp)
{
unsigned int verbosity = 1 ;
unsigned int kimeout = 0 ;
int p[4][2] = { [3] = { [0] = 6, [1] = 7 } } ;
uint32_t coptions = 0 ;
uint32_t poptions = 1 ;
char const *servername = 0 ;
pid_t pid ;
PROG = "s6-ucspitlsc (parent)" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "SsYyv:K:Zzk:6:7:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'S' : coptions |= 4 ; break ;
case 's' : coptions &= ~4 ; break ;
case 'Y' : coptions |= 1 ; coptions &= ~2 ; break ;
case 'y' : coptions |= 3 ; break ;
case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
case 'K' : if (!uint0_scan(l.arg, &kimeout)) dieusage() ; break ;
case 'Z' : poptions &= ~1 ; break ;
case 'z' : poptions |= 1 ; break ;
case 'k' : servername = l.arg ; break ;
case '6' :
{
unsigned int fd ;
if (!uint0_scan(l.arg, &fd)) dieusage() ;
p[3][0] = fd ;
break ;
}
case '7' :
{
unsigned int fd ;
if (!uint0_scan(l.arg, &fd)) dieusage() ;
p[3][1] = fd ;
break ;
}
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) dieusage() ;
fd_sanitize() ;
if (fcntl(p[3][0], F_GETFD) == -1 || fcntl(p[3][1], F_GETFD) == -1)
strerr_diefu1sys(111, "check network fds") ;
if (ipc_pair_b(p[2]) == -1) strerr_diefu1sys(111, "ipc_pair") ;
if (pipe(p[0]) == -1 || pipe(p[1]) == -1) strerr_diefu1sys(111, "pipe") ;
pid = getpid() ;
switch (fork())
{
case -1 : strerr_diefu1sys(111, "fork") ;
case 0 : child(p, coptions, verbosity, kimeout, servername, pid) ;
default : break ;
}
s6tls_ucspi_exec_app(argv, p, poptions) ;
}
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