version 1.12, 2000/03/28 20:34:14 |
version 1.13, 2000/04/03 07:07:15 |
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#include "channels.h" |
#include "channels.h" |
#include "nchan.h" |
#include "nchan.h" |
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static void chan_send_ieof(Channel *c); |
#include "ssh2.h" |
static void chan_send_oclose(Channel *c); |
#include "compat.h" |
static void chan_shutdown_write(Channel *c); |
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static void chan_shutdown_read(Channel *c); |
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/* functions manipulating channel states */ |
/* |
/* |
* EVENTS update channel input/output states execute ACTIONS |
* EVENTS update channel input/output states execute ACTIONS |
*/ |
*/ |
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/* events concerning the INPUT from socket for channel (istate) */ |
/* events concerning the INPUT from socket for channel (istate) */ |
void |
chan_event_fn *chan_rcvd_oclose = NULL; |
chan_rcvd_oclose(Channel *c) |
chan_event_fn *chan_read_failed = NULL; |
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chan_event_fn *chan_ibuf_empty = NULL; |
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/* events concerning the OUTPUT from channel for socket (ostate) */ |
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chan_event_fn *chan_rcvd_ieof = NULL; |
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chan_event_fn *chan_write_failed = NULL; |
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chan_event_fn *chan_obuf_empty = NULL; |
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/* |
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* ACTIONS: should never update the channel states |
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*/ |
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static void chan_send_ieof1(Channel *c); |
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static void chan_send_oclose1(Channel *c); |
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static void chan_send_close2(Channel *c); |
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static void chan_send_eof2(Channel *c); |
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/* channel cleanup */ |
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chan_event_fn *chan_delete_if_full_closed = NULL; |
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/* helper */ |
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static void chan_shutdown_write(Channel *c); |
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static void chan_shutdown_read(Channel *c); |
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/* |
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* SSH1 specific implementation of event functions |
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*/ |
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static void |
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chan_rcvd_oclose1(Channel *c) |
{ |
{ |
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debug("channel %d: rcvd oclose", c->self); |
switch (c->istate) { |
switch (c->istate) { |
case CHAN_INPUT_WAIT_OCLOSE: |
case CHAN_INPUT_WAIT_OCLOSE: |
debug("channel %d: INPUT_WAIT_OCLOSE -> INPUT_CLOSED [rcvd OCLOSE]", c->self); |
debug("channel %d: input wait_oclose -> closed", c->self); |
c->istate = CHAN_INPUT_CLOSED; |
c->istate = CHAN_INPUT_CLOSED; |
break; |
break; |
case CHAN_INPUT_OPEN: |
case CHAN_INPUT_OPEN: |
debug("channel %d: INPUT_OPEN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self); |
debug("channel %d: input open -> closed", c->self); |
chan_shutdown_read(c); |
chan_shutdown_read(c); |
chan_send_ieof(c); |
chan_send_ieof1(c); |
c->istate = CHAN_INPUT_CLOSED; |
c->istate = CHAN_INPUT_CLOSED; |
break; |
break; |
case CHAN_INPUT_WAIT_DRAIN: |
case CHAN_INPUT_WAIT_DRAIN: |
/* both local read_failed and remote write_failed */ |
/* both local read_failed and remote write_failed */ |
log("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self); |
log("channel %d: input drain -> closed", c->self); |
debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self); |
chan_send_ieof1(c); |
chan_send_ieof(c); |
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c->istate = CHAN_INPUT_CLOSED; |
c->istate = CHAN_INPUT_CLOSED; |
break; |
break; |
default: |
default: |
error("protocol error: chan_rcvd_oclose %d for istate %d", c->self, c->istate); |
error("channel %d: protocol error: chan_rcvd_oclose for istate %d", |
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c->self, c->istate); |
return; |
return; |
} |
} |
} |
} |
void |
static void |
chan_read_failed(Channel *c) |
chan_read_failed_12(Channel *c) |
{ |
{ |
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debug("channel %d: read failed", c->self); |
switch (c->istate) { |
switch (c->istate) { |
case CHAN_INPUT_OPEN: |
case CHAN_INPUT_OPEN: |
debug("channel %d: INPUT_OPEN -> INPUT_WAIT_DRAIN [read failed]", c->self); |
debug("channel %d: input open -> drain", c->self); |
chan_shutdown_read(c); |
chan_shutdown_read(c); |
c->istate = CHAN_INPUT_WAIT_DRAIN; |
c->istate = CHAN_INPUT_WAIT_DRAIN; |
break; |
break; |
default: |
default: |
error("internal error: we do not read, but chan_read_failed %d for istate %d", |
error("channel %d: internal error: we do not read, but chan_read_failed for istate %d", |
c->self, c->istate); |
c->self, c->istate); |
break; |
break; |
} |
} |
} |
} |
void |
static void |
chan_ibuf_empty(Channel *c) |
chan_ibuf_empty1(Channel *c) |
{ |
{ |
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debug("channel %d: ibuf empty", c->self); |
if (buffer_len(&c->input)) { |
if (buffer_len(&c->input)) { |
error("internal error: chan_ibuf_empty %d for non empty buffer", c->self); |
error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
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c->self); |
return; |
return; |
} |
} |
switch (c->istate) { |
switch (c->istate) { |
case CHAN_INPUT_WAIT_DRAIN: |
case CHAN_INPUT_WAIT_DRAIN: |
debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_WAIT_OCLOSE [inbuf empty, send IEOF]", c->self); |
debug("channel %d: input drain -> wait_oclose", c->self); |
chan_send_ieof(c); |
chan_send_ieof1(c); |
c->istate = CHAN_INPUT_WAIT_OCLOSE; |
c->istate = CHAN_INPUT_WAIT_OCLOSE; |
break; |
break; |
default: |
default: |
error("internal error: chan_ibuf_empty %d for istate %d", c->self, c->istate); |
error("channel %d: internal error: chan_ibuf_empty for istate %d", |
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c->self, c->istate); |
break; |
break; |
} |
} |
} |
} |
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static void |
/* events concerning the OUTPUT from channel for socket (ostate) */ |
chan_rcvd_ieof1(Channel *c) |
void |
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chan_rcvd_ieof(Channel *c) |
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{ |
{ |
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debug("channel %d: rcvd ieof", c->self); |
switch (c->ostate) { |
switch (c->ostate) { |
case CHAN_OUTPUT_OPEN: |
case CHAN_OUTPUT_OPEN: |
debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_DRAIN [rvcd IEOF]", c->self); |
debug("channel %d: output open -> drain", c->self); |
c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
break; |
break; |
case CHAN_OUTPUT_WAIT_IEOF: |
case CHAN_OUTPUT_WAIT_IEOF: |
debug("channel %d: OUTPUT_WAIT_IEOF -> OUTPUT_CLOSED [rvcd IEOF]", c->self); |
debug("channel %d: output wait_ieof -> closed", c->self); |
c->ostate = CHAN_OUTPUT_CLOSED; |
c->ostate = CHAN_OUTPUT_CLOSED; |
break; |
break; |
default: |
default: |
error("protocol error: chan_rcvd_ieof %d for ostate %d", c->self, c->ostate); |
error("channel %d: protocol error: chan_rcvd_ieof for ostate %d", |
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c->self, c->ostate); |
break; |
break; |
} |
} |
} |
} |
void |
static void |
chan_write_failed(Channel *c) |
chan_write_failed1(Channel *c) |
{ |
{ |
|
debug("channel %d: write failed", c->self); |
switch (c->ostate) { |
switch (c->ostate) { |
case CHAN_OUTPUT_OPEN: |
case CHAN_OUTPUT_OPEN: |
debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_IEOF [write failed]", c->self); |
debug("channel %d: output open -> wait_ieof", c->self); |
chan_send_oclose(c); |
chan_send_oclose1(c); |
c->ostate = CHAN_OUTPUT_WAIT_IEOF; |
c->ostate = CHAN_OUTPUT_WAIT_IEOF; |
break; |
break; |
case CHAN_OUTPUT_WAIT_DRAIN: |
case CHAN_OUTPUT_WAIT_DRAIN: |
debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [write failed]", c->self); |
debug("channel %d: output wait_drain -> closed", c->self); |
chan_send_oclose(c); |
chan_send_oclose1(c); |
c->ostate = CHAN_OUTPUT_CLOSED; |
c->ostate = CHAN_OUTPUT_CLOSED; |
break; |
break; |
default: |
default: |
error("internal error: chan_write_failed %d for ostate %d", c->self, c->ostate); |
error("channel %d: internal error: chan_write_failed for ostate %d", |
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c->self, c->ostate); |
break; |
break; |
} |
} |
} |
} |
void |
static void |
chan_obuf_empty(Channel *c) |
chan_obuf_empty1(Channel *c) |
{ |
{ |
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debug("channel %d: obuf empty", c->self); |
if (buffer_len(&c->output)) { |
if (buffer_len(&c->output)) { |
debug("internal error: chan_obuf_empty %d for non empty buffer", c->self); |
error("channel %d: internal error: chan_obuf_empty for non empty buffer", |
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c->self); |
return; |
return; |
} |
} |
switch (c->ostate) { |
switch (c->ostate) { |
case CHAN_OUTPUT_WAIT_DRAIN: |
case CHAN_OUTPUT_WAIT_DRAIN: |
debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [obuf empty, send OCLOSE]", c->self); |
debug("channel %d: output drain -> closed", c->self); |
chan_send_oclose(c); |
chan_send_oclose1(c); |
c->ostate = CHAN_OUTPUT_CLOSED; |
c->ostate = CHAN_OUTPUT_CLOSED; |
break; |
break; |
default: |
default: |
error("internal error: chan_obuf_empty %d for ostate %d", c->self, c->ostate); |
error("channel %d: internal error: chan_obuf_empty for ostate %d", |
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c->self, c->ostate); |
break; |
break; |
} |
} |
} |
} |
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/* |
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* ACTIONS: should never update the channel states: c->istate or c->ostate |
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*/ |
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static void |
static void |
chan_send_ieof(Channel *c) |
chan_send_ieof1(Channel *c) |
{ |
{ |
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debug("channel %d: send ieof", c->self); |
switch (c->istate) { |
switch (c->istate) { |
case CHAN_INPUT_OPEN: |
case CHAN_INPUT_OPEN: |
case CHAN_INPUT_WAIT_DRAIN: |
case CHAN_INPUT_WAIT_DRAIN: |
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packet_send(); |
packet_send(); |
break; |
break; |
default: |
default: |
error("internal error: channel %d: cannot send IEOF for istate %d", c->self, c->istate); |
error("channel %d: internal error: cannot send ieof for istate %d", |
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c->self, c->istate); |
break; |
break; |
} |
} |
} |
} |
static void |
static void |
chan_send_oclose(Channel *c) |
chan_send_oclose1(Channel *c) |
{ |
{ |
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debug("channel %d: send oclose", c->self); |
switch (c->ostate) { |
switch (c->ostate) { |
case CHAN_OUTPUT_OPEN: |
case CHAN_OUTPUT_OPEN: |
case CHAN_OUTPUT_WAIT_DRAIN: |
case CHAN_OUTPUT_WAIT_DRAIN: |
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packet_send(); |
packet_send(); |
break; |
break; |
default: |
default: |
error("internal error: channel %d: cannot send OCLOSE for ostate %d", c->self, c->istate); |
error("channel %d: internal error: cannot send oclose for ostate %d", |
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c->self, c->ostate); |
break; |
break; |
} |
} |
} |
} |
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static void |
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chan_delete_if_full_closed1(Channel *c) |
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{ |
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if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
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debug("channel %d: full closed", c->self); |
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channel_free(c->self); |
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} |
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} |
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/* helper */ |
/* |
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* the same for SSH2 |
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*/ |
static void |
static void |
chan_shutdown_write(Channel *c) |
chan_rcvd_oclose2(Channel *c) |
{ |
{ |
/* shutdown failure is allowed if write failed already */ |
debug("channel %d: rcvd close", c->self); |
debug("channel %d: shutdown_write", c->self); |
if (c->flags & CHAN_CLOSE_RCVD) |
if (shutdown(c->sock, SHUT_WR) < 0) |
error("channel %d: protocol error: close rcvd twice", c->self); |
debug("chan_shutdown_write failed for #%d/fd%d: %.100s", |
c->flags |= CHAN_CLOSE_RCVD; |
c->self, c->sock, strerror(errno)); |
if (c->type == SSH_CHANNEL_LARVAL) { |
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/* tear down larval channels immediately */ |
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c->ostate = CHAN_OUTPUT_CLOSED; |
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c->istate = CHAN_INPUT_CLOSED; |
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return; |
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} |
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switch (c->ostate) { |
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case CHAN_OUTPUT_OPEN: |
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/* wait until a data from the channel is consumed if a CLOSE is received */ |
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debug("channel %d: output open -> drain", c->self); |
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c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
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break; |
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} |
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switch (c->istate) { |
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case CHAN_INPUT_OPEN: |
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debug("channel %d: input open -> closed", c->self); |
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chan_shutdown_read(c); |
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break; |
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case CHAN_INPUT_WAIT_DRAIN: |
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debug("channel %d: input drain -> closed", c->self); |
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chan_send_eof2(c); |
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break; |
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} |
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c->istate = CHAN_INPUT_CLOSED; |
} |
} |
static void |
static void |
chan_shutdown_read(Channel *c) |
chan_ibuf_empty2(Channel *c) |
{ |
{ |
debug("channel %d: shutdown_read", c->self); |
debug("channel %d: ibuf empty", c->self); |
if (shutdown(c->sock, SHUT_RD) < 0) |
if (buffer_len(&c->input)) { |
error("chan_shutdown_read failed for #%d/fd%d [i%d o%d]: %.100s", |
error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
c->self, c->sock, c->istate, c->ostate, strerror(errno)); |
c->self); |
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return; |
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} |
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switch (c->istate) { |
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case CHAN_INPUT_WAIT_DRAIN: |
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debug("channel %d: input drain -> closed", c->self); |
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if (!(c->flags & CHAN_CLOSE_SENT)) |
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chan_send_eof2(c); |
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c->istate = CHAN_INPUT_CLOSED; |
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break; |
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default: |
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error("channel %d: internal error: chan_ibuf_empty for istate %d", |
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c->self, c->istate); |
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break; |
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} |
} |
} |
void |
static void |
chan_delete_if_full_closed(Channel *c) |
chan_rcvd_ieof2(Channel *c) |
{ |
{ |
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debug("channel %d: rcvd eof", c->self); |
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if (c->ostate == CHAN_OUTPUT_OPEN) { |
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debug("channel %d: output open -> drain", c->self); |
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c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
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} |
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} |
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static void |
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chan_write_failed2(Channel *c) |
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{ |
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debug("channel %d: write failed", c->self); |
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switch (c->ostate) { |
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case CHAN_OUTPUT_OPEN: |
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debug("channel %d: output open -> closed", c->self); |
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chan_shutdown_write(c); // ?? |
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c->ostate = CHAN_OUTPUT_CLOSED; |
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break; |
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case CHAN_OUTPUT_WAIT_DRAIN: |
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debug("channel %d: output drain -> closed", c->self); |
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chan_shutdown_write(c); |
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c->ostate = CHAN_OUTPUT_CLOSED; |
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break; |
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default: |
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error("channel %d: internal error: chan_write_failed for ostate %d", |
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c->self, c->ostate); |
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break; |
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} |
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} |
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static void |
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chan_obuf_empty2(Channel *c) |
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{ |
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debug("channel %d: obuf empty", c->self); |
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if (buffer_len(&c->output)) { |
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error("internal error: chan_obuf_empty %d for non empty buffer", |
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c->self); |
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return; |
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} |
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switch (c->ostate) { |
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case CHAN_OUTPUT_WAIT_DRAIN: |
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debug("channel %d: output drain -> closed", c->self); |
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chan_shutdown_write(c); |
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c->ostate = CHAN_OUTPUT_CLOSED; |
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break; |
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default: |
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error("channel %d: internal error: chan_obuf_empty for ostate %d", |
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c->self, c->ostate); |
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break; |
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} |
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} |
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static void |
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chan_send_eof2(Channel *c) |
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{ |
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debug("channel %d: send eof", c->self); |
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switch (c->istate) { |
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case CHAN_INPUT_WAIT_DRAIN: |
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packet_start(SSH2_MSG_CHANNEL_EOF); |
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packet_put_int(c->remote_id); |
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packet_send(); |
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break; |
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default: |
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error("channel %d: internal error: cannot send eof for istate %d", |
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c->self, c->istate); |
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break; |
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} |
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} |
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static void |
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chan_send_close2(Channel *c) |
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{ |
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debug("channel %d: send close", c->self); |
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if (c->ostate != CHAN_OUTPUT_CLOSED || |
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c->istate != CHAN_INPUT_CLOSED) { |
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error("channel %d: internal error: cannot send close for istate/ostate %d/%d", |
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c->self, c->istate, c->ostate); |
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} else if (c->flags & CHAN_CLOSE_SENT) { |
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error("channel %d: internal error: already sent close", c->self); |
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} else { |
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packet_start(SSH2_MSG_CHANNEL_CLOSE); |
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packet_put_int(c->remote_id); |
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packet_send(); |
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c->flags |= CHAN_CLOSE_SENT; |
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} |
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} |
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static void |
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chan_delete_if_full_closed2(Channel *c) |
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{ |
if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
debug("channel %d: full closed", c->self); |
if (!(c->flags & CHAN_CLOSE_SENT)) { |
channel_free(c->self); |
chan_send_close2(c); |
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} |
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if ((c->flags & CHAN_CLOSE_SENT) && |
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(c->flags & CHAN_CLOSE_RCVD)) { |
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debug("channel %d: full closed2", c->self); |
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channel_free(c->self); |
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} |
} |
} |
} |
} |
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/* shared */ |
void |
void |
chan_init_iostates(Channel *c) |
chan_init_iostates(Channel *c) |
{ |
{ |
c->ostate = CHAN_OUTPUT_OPEN; |
c->ostate = CHAN_OUTPUT_OPEN; |
c->istate = CHAN_INPUT_OPEN; |
c->istate = CHAN_INPUT_OPEN; |
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c->flags = 0; |
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} |
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/* init */ |
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void |
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chan_init(void) |
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{ |
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if (compat20) { |
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chan_rcvd_oclose = chan_rcvd_oclose2; |
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chan_read_failed = chan_read_failed_12; |
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chan_ibuf_empty = chan_ibuf_empty2; |
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chan_rcvd_ieof = chan_rcvd_ieof2; |
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chan_write_failed = chan_write_failed2; |
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chan_obuf_empty = chan_obuf_empty2; |
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|
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chan_delete_if_full_closed = chan_delete_if_full_closed2; |
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} else { |
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chan_rcvd_oclose = chan_rcvd_oclose1; |
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chan_read_failed = chan_read_failed_12; |
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chan_ibuf_empty = chan_ibuf_empty1; |
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chan_rcvd_ieof = chan_rcvd_ieof1; |
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chan_write_failed = chan_write_failed1; |
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chan_obuf_empty = chan_obuf_empty1; |
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|
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chan_delete_if_full_closed = chan_delete_if_full_closed1; |
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} |
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} |
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|
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/* helper */ |
|
static void |
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chan_shutdown_write(Channel *c) |
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{ |
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buffer_consume(&c->output, buffer_len(&c->output)); |
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if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
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return; |
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/* shutdown failure is allowed if write failed already */ |
|
debug("channel %d: close_write", c->self); |
|
if (c->sock != -1) { |
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if (shutdown(c->sock, SHUT_WR) < 0) |
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debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s", |
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c->self, c->sock, strerror(errno)); |
|
} else { |
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if (close(c->wfd) < 0) |
|
log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s", |
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c->self, c->wfd, strerror(errno)); |
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c->wfd = -1; |
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} |
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} |
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static void |
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chan_shutdown_read(Channel *c) |
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{ |
|
if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
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return; |
|
debug("channel %d: close_read", c->self); |
|
if (c->sock != -1) { |
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if (shutdown(c->sock, SHUT_RD) < 0) |
|
error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s", |
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c->self, c->sock, c->istate, c->ostate, strerror(errno)); |
|
} else { |
|
if (close(c->rfd) < 0) |
|
log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s", |
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c->self, c->rfd, strerror(errno)); |
|
c->rfd = -1; |
|
} |
} |
} |