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/* ISC license. */
#include <stdint.h>
#include <unistd.h>
#include <skalibs/gccattributes.h>
#include <skalibs/uint64.h>
#include <skalibs/types.h>
#include <skalibs/envexec.h>
#include <skalibs/djbunix.h>
#include <skalibs/socket.h>
#include <s6-networking/config.h>
#include "s6tls-internal.h"
#define USAGE "s6-ucspitlsd [ -S | -s ] [ -J | -j ] [ -Y | -y ] [ -k snilevel ] [ -v verbosity ] [ -K timeout ] [ -Z | -z ] prog..."
#define dieusage() strerr_dieusage(100, USAGE)
enum golb_e
{
GOLB_CLOSENOTIFY = 0x0001,
GOLB_STRICTCN = 0x0002,
GOLB_CLIENTCERT = 0x0004,
GOLB_CLIENTCERT_ONLY = 0x0008,
GOLB_SNI = 0x0010,
GOLB_SNI_ONLY = 0x0020,
GOLB_KEEP = 0x100,
} ;
enum gola_e
{
GOLA_VERBOSITY,
GOLA_KIMEOUT,
GOLA_SNILEVEL,
GOLA_N
} ;
static inline void child (int *, uint32_t, unsigned int, unsigned int, pid_t) gccattr_noreturn ;
static inline void child (int *p, uint32_t options, unsigned int verbosity, unsigned int kimeout, pid_t pid)
{
ssize_t r ;
char const *newargv[S6TLS_PREP_IO_ARGC] ;
char buf[S6TLS_PREP_IO_BUFLEN] ;
char c ;
PROG = "s6-ucspitlsd" ;
close(p[4]) ;
close(p[1]) ;
close(p[2]) ;
r = read(p[5], &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[5]) ;
p[5] = 0 ; /* we know 0 is open so it's a suitable invalid value */
break ;
case 'Y' :
fd_shutdown(p[5], 0) ;
break ;
default :
strerr_dief1x(100, "unrecognized command on control socket") ;
}
s6tls_prep_tlsdio(newargv, buf, p, options, verbosity, kimeout) ;
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)
{
static gol_bool const rgolb[] =
{
{ .so = 's', .lo = "no-close-notify", .clear = GOLB_CLOSENOTIFY, .set = 0 },
{ .so = 'S', .lo = "close-notify", .clear = 0, .set = GOLB_CLOSENOTIFY },
{ .so = 'j', .lo = "no-enforce-close-notify", .clear = GOLB_STRICTCN, .set = 0 },
{ .so = 'J', .lo = "enforce-close-notify", .clear = 0, .set = GOLB_STRICTCN },
{ .so = 'Y', .lo = "client-cert", .clear = GOLB_CLIENTCERT_ONLY, .set = GOLB_CLIENTCERT },
{ .so = 'y', .lo = "mandatory-client-cert", .clear = 0, .set = GOLB_CLIENTCERT | GOLB_CLIENTCERT_ONLY },
{ .so = 'z', .lo = "no-keep", .clear = GOLB_KEEP, .set = 0 },
{ .so = 'Z', .lo = "keep", .clear = 0, .set = GOLB_KEEP },
{ .so = 0, .lo = "sni", .clear = GOLB_SNI_ONLY, .set = GOLB_SNI },
{ .so = 0, .lo = "mandatory-sni", .clear = 0, .set = GOLB_SNI | GOLB_SNI_ONLY },
} ;
static gol_arg const rgola[] =
{
{ .so = 'v', .lo = "verbosity", .i = GOLA_VERBOSITY },
{ .so = 'K', .lo = "handshake-timeout", .i = GOLA_KIMEOUT },
{ .so = 'k', .lo = "sni-level", .i = GOLA_SNILEVEL },
} ;
int p[6] ;
unsigned int verbosity = 1 ;
unsigned int kimeout = 0 ;
pid_t pid ;
uint64_t wgolb = 0 ;
char const *wgola[GOLA_N] = { 0 } ;
unsigned int golc ;
PROG = "s6-ucspitlsd (parent)" ;
golc = GOL_main(argc, argv, rgolb, rgola, &wgolb, wgola) ;
argc -= golc ; argv += golc ;
if (!argc) dieusage() ;
if (wgola[GOLA_VERBOSITY])
if (!uint0_scan(wgola[GOLA_VERBOSITY], &verbosity))
strerr_dief2x(100, "verbosity", " must be an unsigned integer") ;
if (wgola[GOLA_KIMEOUT])
if (!uint0_scan(wgola[GOLA_KIMEOUT], &kimeout))
strerr_dief2x(100, "handshake-timeout", " must be an unsigned integer") ;
if (wgola[GOLA_SNILEVEL])
{
unsigned int snilevel ;
if (!uint0_scan(wgola[GOLA_SNILEVEL], &snilevel))
strerr_dief2x(100, "sni-level", " must be an unsigned integer") ;
wgolb &= ~(GOLB_SNI | GOLB_SNI_ONLY) ;
wgolb |= (snilevel ? GOLB_SNI : 0) | (snilevel >= 2 ? GOLB_SNI_ONLY : 0) ;
}
if (pipe(p) == -1 || pipe(p+2) == -1) strerr_diefu1sys(111, "pipe") ;
if (ipc_pair_b(p+4) == -1) strerr_diefu1sys(111, "ipc_pair") ;
pid = getpid() ;
switch (fork())
{
case -1 : strerr_diefu1sys(111, "fork") ;
case 0 : child(p, wgolb & 0xff, verbosity, kimeout, pid) ;
default : break ;
}
s6tls_ucspi_exec_app(argv, p, wgolb >> 8) ;
}
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