version 1.63, 2010/01/26 01:28:35 |
version 1.64, 2017/04/30 23:13:25 |
|
|
/* |
/* |
* ACTIONS: should never update the channel states |
* ACTIONS: should never update the channel states |
*/ |
*/ |
static void chan_send_ieof1(Channel *); |
|
static void chan_send_oclose1(Channel *); |
|
static void chan_send_close2(Channel *); |
|
static void chan_send_eof2(Channel *); |
static void chan_send_eof2(Channel *); |
static void chan_send_eow2(Channel *); |
static void chan_send_eow2(Channel *); |
|
|
|
|
istates[next]); |
istates[next]); |
c->istate = next; |
c->istate = next; |
} |
} |
|
|
static void |
static void |
chan_set_ostate(Channel *c, u_int next) |
chan_set_ostate(Channel *c, u_int next) |
{ |
{ |
|
|
c->ostate = next; |
c->ostate = next; |
} |
} |
|
|
/* |
|
* SSH1 specific implementation of event functions |
|
*/ |
|
|
|
static void |
|
chan_rcvd_oclose1(Channel *c) |
|
{ |
|
debug2("channel %d: rcvd oclose", c->self); |
|
switch (c->istate) { |
|
case CHAN_INPUT_WAIT_OCLOSE: |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
case CHAN_INPUT_OPEN: |
|
chan_shutdown_read(c); |
|
chan_send_ieof1(c); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
case CHAN_INPUT_WAIT_DRAIN: |
|
/* both local read_failed and remote write_failed */ |
|
chan_send_ieof1(c); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
default: |
|
error("channel %d: protocol error: rcvd_oclose for istate %d", |
|
c->self, c->istate); |
|
return; |
|
} |
|
} |
|
void |
void |
chan_read_failed(Channel *c) |
chan_read_failed(Channel *c) |
{ |
{ |
|
|
break; |
break; |
} |
} |
} |
} |
|
|
void |
void |
chan_ibuf_empty(Channel *c) |
chan_ibuf_empty(Channel *c) |
{ |
{ |
|
|
} |
} |
switch (c->istate) { |
switch (c->istate) { |
case CHAN_INPUT_WAIT_DRAIN: |
case CHAN_INPUT_WAIT_DRAIN: |
if (compat20) { |
if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_LOCAL))) |
if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_LOCAL))) |
chan_send_eof2(c); |
chan_send_eof2(c); |
chan_set_istate(c, CHAN_INPUT_CLOSED); |
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
} else { |
|
chan_send_ieof1(c); |
|
chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE); |
|
} |
|
break; |
break; |
default: |
default: |
error("channel %d: chan_ibuf_empty for istate %d", |
error("channel %d: chan_ibuf_empty for istate %d", |
|
|
break; |
break; |
} |
} |
} |
} |
static void |
|
chan_rcvd_ieof1(Channel *c) |
|
{ |
|
debug2("channel %d: rcvd ieof", c->self); |
|
switch (c->ostate) { |
|
case CHAN_OUTPUT_OPEN: |
|
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
|
break; |
|
case CHAN_OUTPUT_WAIT_IEOF: |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
|
break; |
|
default: |
|
error("channel %d: protocol error: rcvd_ieof for ostate %d", |
|
c->self, c->ostate); |
|
break; |
|
} |
|
} |
|
static void |
|
chan_write_failed1(Channel *c) |
|
{ |
|
debug2("channel %d: write failed", c->self); |
|
switch (c->ostate) { |
|
case CHAN_OUTPUT_OPEN: |
|
chan_shutdown_write(c); |
|
chan_send_oclose1(c); |
|
chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF); |
|
break; |
|
case CHAN_OUTPUT_WAIT_DRAIN: |
|
chan_shutdown_write(c); |
|
chan_send_oclose1(c); |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
|
break; |
|
default: |
|
error("channel %d: chan_write_failed for ostate %d", |
|
c->self, c->ostate); |
|
break; |
|
} |
|
} |
|
void |
void |
chan_obuf_empty(Channel *c) |
chan_obuf_empty(Channel *c) |
{ |
{ |
|
|
switch (c->ostate) { |
switch (c->ostate) { |
case CHAN_OUTPUT_WAIT_DRAIN: |
case CHAN_OUTPUT_WAIT_DRAIN: |
chan_shutdown_write(c); |
chan_shutdown_write(c); |
if (!compat20) |
|
chan_send_oclose1(c); |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
break; |
break; |
default: |
default: |
|
|
break; |
break; |
} |
} |
} |
} |
static void |
|
chan_send_ieof1(Channel *c) |
|
{ |
|
debug2("channel %d: send ieof", c->self); |
|
switch (c->istate) { |
|
case CHAN_INPUT_OPEN: |
|
case CHAN_INPUT_WAIT_DRAIN: |
|
packet_start(SSH_MSG_CHANNEL_INPUT_EOF); |
|
packet_put_int(c->remote_id); |
|
packet_send(); |
|
break; |
|
default: |
|
error("channel %d: cannot send ieof for istate %d", |
|
c->self, c->istate); |
|
break; |
|
} |
|
} |
|
static void |
|
chan_send_oclose1(Channel *c) |
|
{ |
|
debug2("channel %d: send oclose", c->self); |
|
switch (c->ostate) { |
|
case CHAN_OUTPUT_OPEN: |
|
case CHAN_OUTPUT_WAIT_DRAIN: |
|
buffer_clear(&c->output); |
|
packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
|
packet_put_int(c->remote_id); |
|
packet_send(); |
|
break; |
|
default: |
|
error("channel %d: cannot send oclose for ostate %d", |
|
c->self, c->ostate); |
|
break; |
|
} |
|
} |
|
|
|
/* |
|
* the same for SSH2 |
|
*/ |
|
static void |
|
chan_rcvd_close2(Channel *c) |
|
{ |
|
debug2("channel %d: rcvd close", c->self); |
|
if (!(c->flags & CHAN_LOCAL)) { |
|
if (c->flags & CHAN_CLOSE_RCVD) |
|
error("channel %d: protocol error: close rcvd twice", |
|
c->self); |
|
c->flags |= CHAN_CLOSE_RCVD; |
|
} |
|
if (c->type == SSH_CHANNEL_LARVAL) { |
|
/* tear down larval channels immediately */ |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
return; |
|
} |
|
switch (c->ostate) { |
|
case CHAN_OUTPUT_OPEN: |
|
/* |
|
* wait until a data from the channel is consumed if a CLOSE |
|
* is received |
|
*/ |
|
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
|
break; |
|
} |
|
switch (c->istate) { |
|
case CHAN_INPUT_OPEN: |
|
chan_shutdown_read(c); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
case CHAN_INPUT_WAIT_DRAIN: |
|
if (!(c->flags & CHAN_LOCAL)) |
|
chan_send_eof2(c); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
} |
|
} |
|
|
|
void |
void |
chan_rcvd_eow(Channel *c) |
chan_rcvd_eow(Channel *c) |
{ |
{ |
|
|
break; |
break; |
} |
} |
} |
} |
|
|
static void |
static void |
chan_rcvd_eof2(Channel *c) |
|
{ |
|
debug2("channel %d: rcvd eof", c->self); |
|
c->flags |= CHAN_EOF_RCVD; |
|
if (c->ostate == CHAN_OUTPUT_OPEN) |
|
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
|
} |
|
static void |
|
chan_write_failed2(Channel *c) |
|
{ |
|
debug2("channel %d: write failed", c->self); |
|
switch (c->ostate) { |
|
case CHAN_OUTPUT_OPEN: |
|
case CHAN_OUTPUT_WAIT_DRAIN: |
|
chan_shutdown_write(c); |
|
if (strcmp(c->ctype, "session") == 0) |
|
chan_send_eow2(c); |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
|
break; |
|
default: |
|
error("channel %d: chan_write_failed for ostate %d", |
|
c->self, c->ostate); |
|
break; |
|
} |
|
} |
|
static void |
|
chan_send_eof2(Channel *c) |
chan_send_eof2(Channel *c) |
{ |
{ |
debug2("channel %d: send eof", c->self); |
debug2("channel %d: send eof", c->self); |
|
|
break; |
break; |
} |
} |
} |
} |
|
|
static void |
static void |
chan_send_close2(Channel *c) |
chan_send_close2(Channel *c) |
{ |
{ |
|
|
c->flags |= CHAN_CLOSE_SENT; |
c->flags |= CHAN_CLOSE_SENT; |
} |
} |
} |
} |
|
|
static void |
static void |
chan_send_eow2(Channel *c) |
chan_send_eow2(Channel *c) |
{ |
{ |
|
|
void |
void |
chan_rcvd_ieof(Channel *c) |
chan_rcvd_ieof(Channel *c) |
{ |
{ |
if (compat20) |
debug2("channel %d: rcvd eof", c->self); |
chan_rcvd_eof2(c); |
c->flags |= CHAN_EOF_RCVD; |
else |
if (c->ostate == CHAN_OUTPUT_OPEN) |
chan_rcvd_ieof1(c); |
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && |
if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && |
buffer_len(&c->output) == 0 && |
buffer_len(&c->output) == 0 && |
!CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
!CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
chan_obuf_empty(c); |
chan_obuf_empty(c); |
} |
} |
|
|
void |
void |
chan_rcvd_oclose(Channel *c) |
chan_rcvd_oclose(Channel *c) |
{ |
{ |
if (compat20) |
debug2("channel %d: rcvd close", c->self); |
chan_rcvd_close2(c); |
if (!(c->flags & CHAN_LOCAL)) { |
else |
if (c->flags & CHAN_CLOSE_RCVD) |
chan_rcvd_oclose1(c); |
error("channel %d: protocol error: close rcvd twice", |
|
c->self); |
|
c->flags |= CHAN_CLOSE_RCVD; |
|
} |
|
if (c->type == SSH_CHANNEL_LARVAL) { |
|
/* tear down larval channels immediately */ |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
return; |
|
} |
|
switch (c->ostate) { |
|
case CHAN_OUTPUT_OPEN: |
|
/* |
|
* wait until a data from the channel is consumed if a CLOSE |
|
* is received |
|
*/ |
|
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
|
break; |
|
} |
|
switch (c->istate) { |
|
case CHAN_INPUT_OPEN: |
|
chan_shutdown_read(c); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
case CHAN_INPUT_WAIT_DRAIN: |
|
if (!(c->flags & CHAN_LOCAL)) |
|
chan_send_eof2(c); |
|
chan_set_istate(c, CHAN_INPUT_CLOSED); |
|
break; |
|
} |
} |
} |
|
|
void |
void |
chan_write_failed(Channel *c) |
chan_write_failed(Channel *c) |
{ |
{ |
if (compat20) |
debug2("channel %d: write failed", c->self); |
chan_write_failed2(c); |
switch (c->ostate) { |
else |
case CHAN_OUTPUT_OPEN: |
chan_write_failed1(c); |
case CHAN_OUTPUT_WAIT_DRAIN: |
|
chan_shutdown_write(c); |
|
if (strcmp(c->ctype, "session") == 0) |
|
chan_send_eow2(c); |
|
chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
|
break; |
|
default: |
|
error("channel %d: chan_write_failed for ostate %d", |
|
c->self, c->ostate); |
|
break; |
|
} |
} |
} |
|
|
void |
void |
|
|
} |
} |
if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
return 0; |
return 0; |
if (!compat20) { |
|
debug2("channel %d: is dead", c->self); |
|
return 1; |
|
} |
|
if ((datafellows & SSH_BUG_EXTEOF) && |
if ((datafellows & SSH_BUG_EXTEOF) && |
c->extended_usage == CHAN_EXTENDED_WRITE && |
c->extended_usage == CHAN_EXTENDED_WRITE && |
c->efd != -1 && |
c->efd != -1 && |
|
|
chan_shutdown_write(Channel *c) |
chan_shutdown_write(Channel *c) |
{ |
{ |
buffer_clear(&c->output); |
buffer_clear(&c->output); |
if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
if (c->type == SSH_CHANNEL_LARVAL) |
return; |
return; |
/* shutdown failure is allowed if write failed already */ |
/* shutdown failure is allowed if write failed already */ |
debug2("channel %d: close_write", c->self); |
debug2("channel %d: close_write", c->self); |
|
|
c->self, c->wfd, strerror(errno)); |
c->self, c->wfd, strerror(errno)); |
} |
} |
} |
} |
|
|
static void |
static void |
chan_shutdown_read(Channel *c) |
chan_shutdown_read(Channel *c) |
{ |
{ |
if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
if (c->type == SSH_CHANNEL_LARVAL) |
return; |
return; |
debug2("channel %d: close_read", c->self); |
debug2("channel %d: close_read", c->self); |
if (c->sock != -1) { |
if (c->sock != -1) { |