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#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "iopause.h"
#include "buffer.h"
#include "taia.h"
#include "ucspissl.h"
#include "error.h"
static int leftstatus = 0;
static char leftbuf[16 * 1024];
static int leftlen;
static int leftpos;
static int rightstatus = 0;
static char rightbuf[16 * 1024];
static int rightlen;
static int rightpos;
int ssl_io(SSL *ssl,int fdleft,int fdright,unsigned int timeout) {
struct taia now;
struct taia deadline;
iopause_fd x[4];
int xlen;
iopause_fd *io0;
iopause_fd *ioleft;
iopause_fd *io1;
iopause_fd *ioright;
int r;
int rc = 0;
int rfd;
int wfd;
rfd = SSL_get_fd(ssl); /* XXX */
if (rfd == -1) {
close(fdleft); close(fdright);
return -1;
}
wfd = SSL_get_fd(ssl); /* XXX */
if (wfd == -1) {
close(fdleft); close(fdright);
return -1;
}
for (;;) {
xlen = 0;
if (leftstatus == -1 && rightstatus == -1)
goto DONE;
io0 = 0;
if (leftstatus == 0 && rightstatus != 1) {
io0 = &x[xlen++];
io0->fd = rfd;
io0->events = IOPAUSE_READ;
}
ioleft = 0;
if (leftstatus == 1) {
ioleft = &x[xlen++];
ioleft->fd = fdleft;
ioleft->events = IOPAUSE_WRITE;
}
ioright = 0;
if (rightstatus == 0) {
ioright = &x[xlen++];
ioright->fd = fdright;
ioright->events = IOPAUSE_READ;
}
io1 = 0;
if (rightstatus == 1) {
io1 = &x[xlen++];
io1->fd = wfd;
io1->events = IOPAUSE_WRITE;
}
if (taia_now(&now) == -1) {
errno = ETIMEDOUT;
rc = -1;
goto BOMB;
}
taia_uint(&deadline,timeout);
taia_add(&deadline,&now,&deadline);
iopause(x,xlen,&deadline,&now);
for (r = 0; r < xlen; ++r)
if (x[r].revents) goto EVENTS;
if (io0 && !ssl_pending(ssl)) {
close(fdleft);
leftstatus = -1;
continue;
}
errno = ETIMEDOUT;
rc = -1;
goto BOMB;
EVENTS:
if (io0 && io0->revents) {
r = SSL_read(ssl,leftbuf,sizeof(leftbuf));
ssl_errno = SSL_get_error(ssl,r);
switch (ssl_errno) {
case SSL_ERROR_NONE:
leftstatus = 1;
leftpos = 0;
leftlen = r;
break;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_X509_LOOKUP:
break;
case SSL_ERROR_ZERO_RETURN:
if (rightstatus == -1) goto DONE;
close(fdleft);
leftstatus = -1;
break;
case SSL_ERROR_SYSCALL:
if (errno == EAGAIN || errno == EINTR) break;
close(fdleft);
leftstatus = -1;
if (!errno) break;
/* premature close */
if (errno == ECONNRESET && rightstatus == -1) goto DONE;
goto BOMB;
case SSL_ERROR_SSL:
/* Continuing after a received SSL error given the socket is still
* potentially active might be a noble cause, but is impracticle.
* We consider an SSL_ERROR_SSL as application failure; not TLS
* and close the connection gracefully.
* if (errno == EAGAIN || errno == EINTR) break;
* if (!errno) break;
*/
goto DONE;
default:
close(fdleft);
leftstatus = -1;
if (rightstatus == 1) break;
if (ssl_shutdown_pending(ssl)) goto DONE;
goto BOMB;
}
}
if (ioleft && ioleft->revents) {
r = buffer_unixwrite(fdleft,leftbuf + leftpos,leftlen - leftpos);
if (r == -1) {
if (errno == EINTR || errno == EWOULDBLOCK) {
/* retry */
}
else if (errno == EPIPE || errno == EAGAIN) {
if (rightstatus == -1) goto DONE;
close(fdleft);
leftstatus = -1;
} else {
rc = -1;
goto BOMB;
}
}
else {
leftpos += r;
if (leftpos == leftlen) {
leftstatus = 0;
if ((r = ssl_pending(ssl))) {
if (r > sizeof(leftbuf)) r = sizeof(leftbuf);
r = SSL_read(ssl,leftbuf,r);
ssl_errno = SSL_get_error(ssl,r);
switch (ssl_errno) {
case SSL_ERROR_NONE:
leftstatus = 1;
leftpos = 0;
leftlen = r;
break;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_X509_LOOKUP:
break;
case SSL_ERROR_ZERO_RETURN:
if (rightstatus == -1) goto DONE;
close(fdleft);
leftstatus = -1;
break;
default:
rc = -1;
goto BOMB;
}
}
}
}
}
if (ioright && ioright->revents) {
r = buffer_unixread(fdright,rightbuf,sizeof(rightbuf));
if (r == -1) {
if (errno == EINTR || errno == EWOULDBLOCK) {
/* retry */
} else {
rc = -1;
goto BOMB; /* errno == EAGAIN => unrecoverable */
}
}
else if (r == 0) {
close(fdright);
rightstatus = -1;
if (ssl_shutdown(ssl)) goto DONE;
if (leftstatus == -1) goto DONE;
}
else {
rightstatus = 1;
rightpos = 0;
rightlen = r;
}
}
if (io1 && io1->revents) {
r = SSL_write(ssl,rightbuf + rightpos,rightlen - rightpos);
ssl_errno = SSL_get_error(ssl,r);
switch (ssl_errno) {
case SSL_ERROR_NONE:
rightpos += r;
if (rightpos == rightlen) rightstatus = 0;
break;
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
case SSL_ERROR_WANT_X509_LOOKUP:
break;
case SSL_ERROR_ZERO_RETURN:
close(fdright);
rightstatus = -1;
if (leftstatus == -1) goto DONE;
if (ssl_shutdown(ssl)) goto DONE;
break;
case SSL_ERROR_SYSCALL:
if (errno == EAGAIN || errno == EINTR) break;
if (errno == EPIPE) {
close(fdright);
rightstatus = -1;
if (leftstatus == -1) goto DONE;
if (ssl_shutdown(ssl)) goto DONE;
break;
}
default:
rc = -1;
goto BOMB;
}
}
}
BOMB:
r = errno;
if (leftstatus != -1) close(fdleft);
if (rightstatus != -1) close(fdright);
if (!ssl_shutdown_sent(ssl)) ssl_shutdown(ssl);
if (!ssl_shutdown_pending(ssl)) ssl_shutdown(ssl);
shutdown(wfd,2);
errno = r;
return rc;
DONE:
if (!ssl_shutdown_sent(ssl)) ssl_shutdown(ssl);
if (!ssl_shutdown_pending(ssl)) ssl_shutdown(ssl);
shutdown(wfd,2);
if (leftstatus != -1) close(fdleft);
if (rightstatus != -1) close(fdright);
return 0;
}
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