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-rw-r--r--src/stls/stls_run.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/src/stls/stls_run.c b/src/stls/stls_run.c
new file mode 100644
index 0000000..24ff801
--- /dev/null
+++ b/src/stls/stls_run.c
@@ -0,0 +1,274 @@
+/* ISC license. */
+
+#include <skalibs/nonposix.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <signal.h>
+#include <tls.h>
+#include <skalibs/uint32.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/error.h>
+#include <skalibs/buffer.h>
+#include <skalibs/sig.h>
+#include <skalibs/selfpipe.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/tai.h>
+#include <skalibs/iopause.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/siovec.h>
+#include <s6-networking/stls.h>
+
+typedef struct tlsbuf_s tlsbuf_t, *tlsbuf_t_ref ;
+struct tlsbuf_s
+{
+ char buf[STLS_BUFSIZE] ;
+ buffer b ;
+ unsigned int blockedonother : 1 ;
+} ;
+
+static inline int buffer_tls_flush (struct tls *ctx, tlsbuf_t *b)
+{
+ siovec_t v[2] ;
+ ssize_t r, w ;
+ buffer_rpeek(&b[0].b, v) ;
+ r = tls_write(ctx, v[0].s, v[0].len) ;
+ switch (r)
+ {
+ case -1 : return -1 ;
+ case TLS_WANT_POLLIN :
+ if (b[1].blockedonother) strerr_dief1x(101, "TLS deadlock") ;
+ b[0].blockedonother = 1 ;
+ case TLS_WANT_POLLOUT : return 0 ;
+ default : break ;
+ }
+ w = r ;
+ if (v[1].len)
+ {
+ r = tls_write(ctx, v[1].s, v[1].len) ;
+ switch (r)
+ {
+ case TLS_WANT_POLLIN :
+ if (b[1].blockedonother) strerr_dief1x(101, "TLS deadlock") ;
+ b[0].blockedonother = 1 ;
+ case -1 :
+ case TLS_WANT_POLLOUT :
+ buffer_rseek(&b[0].b, w) ;
+ return 0 ;
+ default : break ;
+ }
+ w += r ;
+ }
+ buffer_rseek(&b[0].b, w) ;
+ return 1 ;
+}
+
+static inline int buffer_tls_fill (struct tls *ctx, tlsbuf_t *b)
+{
+ siovec_t v[2] ;
+ ssize_t r, w ;
+ int ok = 1 ;
+ buffer_wpeek(&b[1].b, v) ;
+ r = tls_read(ctx, v[0].s, v[0].len) ;
+ switch (r)
+ {
+ case 0 : return -2 ;
+ case -1 : return -1 ;
+ case TLS_WANT_POLLOUT :
+ if (b[0].blockedonother) strerr_dief1x(101, "TLS deadlock") ;
+ b[1].blockedonother = 1 ;
+ case TLS_WANT_POLLIN : return 0 ;
+ default : break ;
+ }
+ w = r ;
+ if (v[1].len)
+ {
+ r = tls_read(ctx, v[1].s, v[1].len) ;
+ switch (r)
+ {
+ case TLS_WANT_POLLOUT :
+ if (b[0].blockedonother) strerr_dief1x(101, "TLS deadlock") ;
+ b[1].blockedonother = 1 ;
+ case -1 :
+ case TLS_WANT_POLLIN :
+ buffer_wseek(&b[1].b, w) ;
+ return 0 ;
+ case 0 : ok = -1 ;
+ default : break ;
+ }
+ w += r ;
+ }
+ buffer_wseek(&b[1].b, w) ;
+ return ok ;
+}
+
+static void do_tls_close (struct tls *ctx, int fd)
+{
+ iopause_fd x = { .fd = fd, .events = IOPAUSE_WRITE } ;
+ while (tls_close(ctx) == TLS_WANT_POLLOUT)
+ if (iopause_g(&x, 1, 0) < 0)
+ strerr_diefu1sys(111, "iopause") ;
+}
+
+int stls_run (struct tls *ctx, int *fds, unsigned int verbosity, uint32 options, tain_t const *tto)
+{
+ tlsbuf_t b[2] = { { .blockedonother = 0 }, { .blockedonother = 0 } } ;
+ iopause_fd x[4] ;
+ unsigned int xindex[4] ;
+ register unsigned int i ;
+
+ for (i = 0 ; i < 2 ; i++)
+ {
+ buffer_init(&b[i].b, i ? &buffer_write : &buffer_read, fds[i], b[i].buf, STLS_BUFSIZE) ;
+ if (ndelay_on(fds[2+i]) < 0) strerr_diefu1sys(111, "set fds non-blocking") ;
+ }
+ if (sig_ignore(SIGPIPE) < 0) strerr_diefu1sys(111, "ignore SIGPIPE") ;
+
+ tain_now_g() ;
+
+ for (;;)
+ {
+ tain_t deadline ;
+ unsigned int xlen = 0 ;
+ register int r ;
+
+ tain_add_g(&deadline, buffer_isempty(&b[0].b) && buffer_isempty(&b[1].b) ? tto : &tain_infinite_relative) ;
+
+
+ /* poll() preparation */
+
+ if (fds[0] >= 0 && buffer_isreadable(&b[0].b))
+ {
+ x[xlen].fd = fds[0] ;
+ x[xlen].events = IOPAUSE_READ ;
+ xindex[0] = xlen++ ;
+ }
+ else xindex[0] = 4 ;
+
+ if (fds[1] >= 0 && buffer_iswritable(&b[1].b))
+ {
+ x[xlen].fd = fds[1] ;
+ x[xlen].events = IOPAUSE_WRITE ;
+ xindex[1] = xlen++ ;
+ }
+ else xindex[1] = 4 ;
+
+ if (fds[2] >= 0 && !b[1].blockedonother && buffer_isreadable(&b[1].b))
+ {
+ x[xlen].fd = fds[2] ;
+ x[xlen].events = IOPAUSE_READ ;
+ xindex[2] = xlen++ ;
+ }
+ else xindex[2] = 4 ;
+
+ if (fds[3] >= 0 && !b[0].blockedonother && buffer_iswritable(&b[0].b))
+ {
+ x[xlen].fd = fds[3] ;
+ x[xlen].events = IOPAUSE_WRITE ;
+ xindex[3] = xlen++ ;
+ }
+ else xindex[3] = 4 ;
+
+ if (!xlen) break ;
+
+
+ /* poll() */
+
+ r = iopause_g(x, xlen, &deadline) ;
+ if (r < 0) strerr_diefu1sys(111, "iopause") ;
+ else if (!r)
+ {
+ fd_close(fds[0]) ;
+ tls_close(ctx) ;
+ continue ;
+ }
+
+ while (xlen--)
+ if (x[xlen].revents & IOPAUSE_EXCEPT)
+ x[xlen].revents |= IOPAUSE_READ | IOPAUSE_WRITE ;
+
+
+ /* Flush to local */
+
+ if (xindex[1] < 4 && x[xindex[1]].revents & IOPAUSE_WRITE)
+ {
+ r = buffer_flush(&b[1].b) ;
+ if (!r && !error_isagain(errno))
+ {
+ strerr_warnwu1sys("write to application") ;
+ if (fds[2] >= 0)
+ {
+ if (options & 1) shutdown(fds[2], SHUT_RD) ;
+ fd_close(fds[2]) ; fds[2] = -1 ;
+ }
+ r = 1 ;
+ }
+ if (r && fds[2] < 0)
+ {
+ fd_close(fds[1]) ; fds[1] = -1 ;
+ }
+ }
+
+
+ /* Flush to remote */
+
+ if (xindex[3] < 4 && x[xindex[3]].revents & IOPAUSE_WRITE)
+ {
+ r = buffer_tls_flush(ctx, b) ;
+ if (r < 0)
+ {
+ strerr_warnwu2x("write to peer: ", tls_error(ctx)) ;
+ fd_close(fds[0]) ; fds[0] = -1 ;
+ }
+ if (r && fds[0] < 0)
+ {
+ if (fds[2] >= 0) do_tls_close(ctx, fds[3]) ;
+ if (options & 1) shutdown(fds[3], SHUT_WR) ;
+ fd_close(fds[3]) ; fds[3] = -1 ;
+ }
+ }
+
+
+ /* Fill from local */
+
+ if (xindex[0] < 4 && x[xindex[0]].revents & IOPAUSE_READ)
+ {
+ r = sanitize_read(buffer_fill(&b[0].b)) ;
+ if (r < 0)
+ {
+ if (r == -1) strerr_warnwu1sys("read from application") ;
+ fd_close(fds[0]) ; fds[0] = -1 ;
+ if (buffer_isempty(&b[0].b))
+ {
+ if (fds[2] >= 0) do_tls_close(ctx, fds[3]) ;
+ if (options & 1) shutdown(fds[3], SHUT_WR) ;
+ fd_close(fds[3]) ; fds[3] = -1 ;
+ }
+ }
+ }
+
+
+ /* Fill from remote */
+
+ if (xindex[2] < 4 && x[xindex[2]].revents & IOPAUSE_READ)
+ {
+ r = buffer_tls_fill(ctx, b) ;
+ if (r < 0)
+ {
+ if (errno != EPIPE) strerr_warnwu1sys("read from peer") ;
+ if (options & 1) shutdown(fds[2], SHUT_RD) ;
+ fd_close(fds[2]) ; fds[2] = -1 ;
+ if (buffer_isempty(&b[1].b))
+ {
+ fd_close(fds[1]) ; fds[1] = -1 ;
+ }
+ }
+ }
+ }
+
+ 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 0 ;
+}
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