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/* ISC license. */
#include <skalibs/nonposix.h>
#include <sys/socket.h>
#include <errno.h>
#include <signal.h>
#include <bearssl.h>
#include <skalibs/error.h>
#include <skalibs/strerr2.h>
#include <skalibs/sig.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <skalibs/selfpipe.h>
#include <s6-networking/sbearssl.h>
static inline void handle_signals (pid_t pid, int *e)
{
for (;;) switch (selfpipe_read())
{
case -1 : strerr_diefu1sys(111, "read selfpipe") ;
case 0 : return ;
case SIGCHLD :
{
int wstat ;
if (wait_pid_nohang(pid, &wstat) == pid)
{
*e = wstat ;
return ;
}
}
}
}
int sbearssl_run (br_ssl_engine_context *ctx, int *fds, pid_t pid, unsigned int verbosity, uint32_t options, tain_t const *tto)
{
iopause_fd x[5] = { { .fd = fds[4], .events = IOPAUSE_READ } } ;
unsigned int xindex[4] ;
int markedforflush = 0 ;
int e = -1 ;
if (ndelay_on(fds[2]) < 0 || ndelay_on(fds[3]) < 0)
strerr_diefu1sys(111, "set fds non-blocking") ;
if (sig_ignore(SIGPIPE) < 0)
strerr_diefu1sys(111, "ignore SIGPIPE") ;
for (;;)
{
tain_t deadline ;
unsigned int j = 1 ;
unsigned int state = br_ssl_engine_current_state(ctx) ;
int r ;
if (state & BR_SSL_CLOSED)
{
r = br_ssl_engine_last_error(ctx) ;
if (r) strerr_diefu2x(98, "establish or maintain SSL connection to peer: ", sbearssl_error_str(r)) ;
break ;
}
tain_add_g(&deadline, fds[0] >= 0 && fds[2] >= 0 && state & (BR_SSL_SENDAPP | BR_SSL_RECVREC) ? tto : &tain_infinite_relative) ;
if (fds[0] >= 0 && state & BR_SSL_SENDAPP)
{
x[j].fd = fds[0] ;
x[j].events = IOPAUSE_READ ;
xindex[0] = j++ ;
}
else xindex[0] = 5 ;
if (fds[1] >= 0 && state & BR_SSL_RECVAPP)
{
x[j].fd = fds[1] ;
x[j].events = IOPAUSE_WRITE ;
xindex[1] = j++ ;
}
else xindex[1] = 5 ;
if (fds[2] >= 0 && state & BR_SSL_RECVREC)
{
x[j].fd = fds[2] ;
x[j].events = IOPAUSE_READ ;
xindex[2] = j++ ;
}
else xindex[2] = 5 ;
if (fds[3] >= 0 && state & BR_SSL_SENDREC)
{
x[j].fd = fds[3] ;
x[j].events = IOPAUSE_WRITE ;
xindex[3] = j++ ;
}
else xindex[3] = 5 ;
if (j == 1) break ;
r = iopause_g(x, j, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
else if (!r)
{
fd_close(fds[0]) ; fds[0] = -1 ;
if (options & 1)
{
shutdown(fds[3], SHUT_WR) ;
fd_close(fds[3]) ; fds[3] = -1 ;
}
else br_ssl_engine_close(ctx) ;
if (e >= 0) break ;
continue ;
}
while (j--)
if (x[j].revents & IOPAUSE_EXCEPT)
x[j].revents |= IOPAUSE_READ | IOPAUSE_WRITE ;
/* Signal */
if (x[0].revents & IOPAUSE_READ) handle_signals(pid, &e) ;
/* Flush to local */
if (state & BR_SSL_RECVAPP && x[xindex[1]].events & x[xindex[1]].revents & IOPAUSE_WRITE)
{
size_t len ;
unsigned char const *s = br_ssl_engine_recvapp_buf(ctx, &len) ;
size_t w = allwrite(fds[1], (char const *)s, len) ;
if (!w)
{
if (!error_isagain(errno))
strerr_diefu1sys(111, "write to application") ;
}
else
{
br_ssl_engine_recvapp_ack(ctx, w) ;
if (fds[2] < 0 && w == len)
{
fd_close(fds[1]) ; fds[1] = -1 ;
}
state = br_ssl_engine_current_state(ctx) ;
}
}
/* Flush to remote */
if (state & BR_SSL_SENDREC && xindex[3] < 5 && x[xindex[3]].events & x[xindex[3]].revents & IOPAUSE_WRITE)
{
size_t len ;
unsigned char const *s = br_ssl_engine_sendrec_buf(ctx, &len) ;
size_t w = allwrite(fds[3], (char const *)s, len) ;
if (!w)
{
if (!error_isagain(errno))
strerr_diefu1sys(111, "write to peer") ;
}
else
{
br_ssl_engine_sendrec_ack(ctx, w) ;
if (fds[0] < 0 && w == len)
{
if (options & 1)
{
shutdown(fds[3], SHUT_WR) ;
fd_close(fds[3]) ; fds[3] = -1 ;
}
else br_ssl_engine_close(ctx) ;
if (e >= 0) break ;
}
state = br_ssl_engine_current_state(ctx) ;
}
}
/* Fill from local */
if (state & BR_SSL_SENDAPP && xindex[0] < 5 && x[xindex[0]].events & IOPAUSE_READ && (markedforflush || x[xindex[0]].revents & IOPAUSE_READ))
{
size_t len ;
unsigned char *s = br_ssl_engine_sendapp_buf(ctx, &len) ;
size_t w = allread(fds[0], (char *)s, len) ;
if (!w)
{
br_ssl_engine_flush(ctx, 0) ;
markedforflush = 0 ;
if (!error_isagain(errno))
{
fd_close(fds[0]) ; fds[0] = -1 ;
if (!br_ssl_engine_sendrec_buf(ctx, &len))
{
if (options & 1)
{
shutdown(fds[3], SHUT_WR) ;
fd_close(fds[3]) ; fds[3] = -1 ;
}
else br_ssl_engine_close(ctx) ;
if (e >= 0) break ;
}
}
}
else
{
br_ssl_engine_sendapp_ack(ctx, w) ;
if (w == len) markedforflush = 1 ;
else
{
br_ssl_engine_flush(ctx, 0) ;
markedforflush = 0 ;
}
}
state = br_ssl_engine_current_state(ctx) ;
}
/* Fill from remote */
if (state & BR_SSL_RECVREC && xindex[2] < 5 && x[xindex[2]].events & x[xindex[2]].revents & IOPAUSE_READ)
{
size_t len ;
unsigned char *s = br_ssl_engine_recvrec_buf(ctx, &len) ;
size_t w = allread(fds[2], (char *)s, len) ;
if (!w)
{
if (!error_isagain(errno))
{
if (options & 1) shutdown(fds[2], SHUT_RD) ;
fd_close(fds[2]) ; fds[2] = -1 ;
if (fds[1] >= 0 && !br_ssl_engine_recvapp_buf(ctx, &len))
{
fd_close(fds[1]) ; fds[1] = -1 ;
}
}
}
else br_ssl_engine_recvrec_ack(ctx, w) ;
}
}
if (fds[1] >= 0) fd_close(fds[1]) ;
if (fds[0] >= 0) fd_close(fds[0]) ;
if (fds[3] >= 0) fd_close(fds[3]) ;
if (fds[2] >= 0) fd_close(fds[2]) ;
return e ;
}
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