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/* ISC license. */
#include <unistd.h>
#include <errno.h>
#include <bearssl.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/error.h>
#include <skalibs/strerr.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <s6-networking/sbearssl.h>
#include "sbearssl-internal.h"
/* declared in bearssl's inner.h */
extern void br_ssl_engine_fail (br_ssl_engine_context *, int) ;
/* XXX: breaks encapsulation; see make_ready_in() in src/ssl/ssl_engine.c in bearssl */
static int br_ssl_engine_in_isempty (br_ssl_engine_context *ctx)
{
return !ctx->iomode || (ctx->iomode == 3 && !ctx->ixa && !ctx->ixb) ;
}
static void close_sendrec (br_ssl_engine_context *ctx, int *fd, int closenotify)
{
if (closenotify) br_ssl_engine_close(ctx) ;
else
{
fd_shutdown(*fd, 1) ;
fd_close(*fd) ;
*fd = -1 ;
}
}
void sbearssl_run (br_ssl_engine_context *ctx, int const *fds, tain const *tto, uint32_t options, unsigned int verbosity, sbearssl_handshake_cbfunc_ref cb, sbearssl_handshake_cbarg *cbarg)
{
iopause_fd x[4] = { { .fd = fds[0], .revents = 0 }, { .fd = fds[1], .revents = 0 }, { .fd = fds[2] }, { .fd = fds[3] } } ;
unsigned int state = br_ssl_engine_current_state(ctx) ;
int handshake_done = 0 ;
tain deadline ;
if (ndelay_on(x[0].fd) == -1
|| ndelay_on(x[1].fd) == -1
|| ndelay_on(x[2].fd) == -1
|| ndelay_on(x[3].fd) == -1)
strerr_diefu1sys(111, "set fds non-blocking") ;
tain_add_g(&deadline, tto) ;
while (x[0].fd >= 0 || x[1].fd >= 0 || x[3].fd >= 0)
{
if (state & BR_SSL_CLOSED)
{
int r = br_ssl_engine_last_error(ctx) ;
if (r) strerr_dief4x(98, "the TLS engine closed the connection ", handshake_done ? "after" : "during", " the handshake: ", sbearssl_error_str(r)) ;
else break ;
}
/* Preparation */
if (x[0].fd >= 0 && state & BR_SSL_SENDAPP)
{
x[0].events = IOPAUSE_READ ;
if (!handshake_done)
{
if (!(*cb)(ctx, cbarg))
strerr_dief1sys(111, "post-handshake callback failed") ;
handshake_done = 1 ;
deadline = tain_infinite ;
}
}
else x[0].events = 0 ;
if (x[1].fd >= 0)
x[1].events = IOPAUSE_EXCEPT | (state & BR_SSL_RECVAPP ? IOPAUSE_WRITE : 0) ;
if (x[2].fd >= 0 && state & BR_SSL_RECVREC) x[2].events = IOPAUSE_READ ;
else x[2].events = 0 ;
if (x[3].fd >= 0)
x[3].events = IOPAUSE_EXCEPT | (state & BR_SSL_SENDREC ? IOPAUSE_WRITE : 0) ;
/* Wait for events */
switch (iopause_g(handshake_done ? x : x+2, handshake_done ? 4 : 2, &deadline))
{
case -1 : strerr_diefu1sys(111, "iopause") ;
case 0 :
if (verbosity) strerr_dief1x(98, "handshake timed out") ;
else _exit(98) ;
}
/* Flush to local */
if (x[1].revents && state & BR_SSL_RECVAPP)
{
size_t len ;
for (;;)
{
ssize_t w ;
unsigned char const *s = br_ssl_engine_recvapp_buf(ctx, &len) ;
if (!len) break ;
w = fd_write(x[1].fd, (char const *)s, len) ;
if (w == -1)
{
if (error_isagain(errno)) break ;
strerr_diefu1sys(111, "write to local") ;
}
br_ssl_engine_recvapp_ack(ctx, w) ;
}
if (x[2].fd == -1 && !len)
{
fd_close(x[1].fd) ;
x[1].fd = -1 ;
}
state = br_ssl_engine_current_state(ctx) ;
}
/* Flush to remote */
if (x[3].revents && state & BR_SSL_SENDREC)
{
size_t len ;
for (;;)
{
ssize_t w ;
unsigned char const *s = br_ssl_engine_sendrec_buf(ctx, &len) ;
if (!len) break ;
w = fd_write(x[3].fd, (char const *)s, len) ;
if (w == -1)
{
if (error_isagain(errno)) break ;
strerr_diefu1sys(111, "write to remote") ;
}
br_ssl_engine_sendrec_ack(ctx, w) ;
}
if (x[0].fd == -1 && !len)
close_sendrec(ctx, &x[3].fd, options & 1) ;
state = br_ssl_engine_current_state(ctx) ;
}
/* Fill from local */
if (x[0].revents & IOPAUSE_READ && state & BR_SSL_SENDAPP)
{
for (;;)
{
size_t len ;
ssize_t r ;
unsigned char *s = br_ssl_engine_sendapp_buf(ctx, &len) ;
if (!len) break ;
r = fd_read(x[0].fd, (char *)s, len) ;
if (r == -1 && !error_isagain(errno))
strerr_diefu1sys(111, "read from local") ;
else if (r <= 0)
{
br_ssl_engine_flush(ctx, 0) ;
if (!r)
{
fd_close(x[0].fd) ;
x[0].fd = -1 ;
if (!br_ssl_engine_sendrec_buf(ctx, &len))
close_sendrec(ctx, &x[3].fd, options & 1) ;
}
break ;
}
br_ssl_engine_sendapp_ack(ctx, r) ;
}
state = br_ssl_engine_current_state(ctx) ;
}
/* Fill from remote */
if (x[2].revents & IOPAUSE_READ && state & BR_SSL_RECVREC)
{
for (;;)
{
size_t len ;
ssize_t r ;
unsigned char *s = br_ssl_engine_recvrec_buf(ctx, &len) ;
if (!s) break ;
r = fd_read(x[2].fd, (char *)s, len) ;
if (r == -1)
{
if (error_isagain(errno)) break ;
else strerr_diefu1sys(111, "read from remote") ;
}
else if (!r)
{
fd_shutdown(x[2].fd, 0) ;
fd_close(x[2].fd) ;
x[2].fd = -1 ;
if (!br_ssl_engine_recvapp_buf(ctx, &len))
{
fd_close(x[1].fd) ;
x[1].fd = -1 ;
}
if (!br_ssl_engine_in_isempty(ctx))
br_ssl_engine_fail(ctx, BR_ERR_IO) ;
break ;
}
br_ssl_engine_recvrec_ack(ctx, r) ;
}
state = br_ssl_engine_current_state(ctx) ;
}
}
_exit(0) ;
}
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