diff options
Diffstat (limited to 'crypto/openssh/nchan.c')
| -rw-r--r-- | crypto/openssh/nchan.c | 405 |
1 files changed, 331 insertions, 74 deletions
diff --git a/crypto/openssh/nchan.c b/crypto/openssh/nchan.c index 1f30a7c..fd92fe8 100644 --- a/crypto/openssh/nchan.c +++ b/crypto/openssh/nchan.c @@ -28,7 +28,7 @@ */ #include "includes.h" -RCSID("$Id: nchan.c,v 1.10 2000/01/10 10:15:28 markus Exp $"); +RCSID("$Id: nchan.c,v 1.17 2000/05/08 17:44:54 markus Exp $"); #include "ssh.h" @@ -37,143 +37,192 @@ RCSID("$Id: nchan.c,v 1.10 2000/01/10 10:15:28 markus Exp $"); #include "channels.h" #include "nchan.h" -static void chan_send_ieof(Channel *c); -static void chan_send_oclose(Channel *c); -static void chan_shutdown_write(Channel *c); -static void chan_shutdown_read(Channel *c); -static void chan_delete_if_full_closed(Channel *c); +#include "ssh2.h" +#include "compat.h" +/* functions manipulating channel states */ /* * EVENTS update channel input/output states execute ACTIONS */ - /* events concerning the INPUT from socket for channel (istate) */ -void -chan_rcvd_oclose(Channel *c) +chan_event_fn *chan_rcvd_oclose = NULL; +chan_event_fn *chan_read_failed = NULL; +chan_event_fn *chan_ibuf_empty = NULL; +/* events concerning the OUTPUT from channel for socket (ostate) */ +chan_event_fn *chan_rcvd_ieof = NULL; +chan_event_fn *chan_write_failed = NULL; +chan_event_fn *chan_obuf_empty = NULL; +/* + * ACTIONS: should never update the channel states + */ +static void chan_send_ieof1(Channel *c); +static void chan_send_oclose1(Channel *c); +static void chan_send_close2(Channel *c); +static void chan_send_eof2(Channel *c); + +/* channel cleanup */ +chan_event_fn *chan_delete_if_full_closed = NULL; + +/* helper */ +static void chan_shutdown_write(Channel *c); +static void chan_shutdown_read(Channel *c); + +/* + * SSH1 specific implementation of event functions + */ + +static void +chan_rcvd_oclose1(Channel *c) { + debug("channel %d: rcvd oclose", c->self); switch (c->istate) { 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; break; 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_send_ieof(c); + chan_send_ieof1(c); c->istate = CHAN_INPUT_CLOSED; break; case CHAN_INPUT_WAIT_DRAIN: /* both local read_failed and remote write_failed */ - log("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self); - debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self); - chan_send_ieof(c); + log("channel %d: input drain -> closed", c->self); + chan_send_ieof1(c); c->istate = CHAN_INPUT_CLOSED; break; 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", + c->self, c->istate); return; } - chan_delete_if_full_closed(c); } -void -chan_read_failed(Channel *c) +static void +chan_read_failed_12(Channel *c) { + debug("channel %d: read failed", c->self); switch (c->istate) { 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); c->istate = CHAN_INPUT_WAIT_DRAIN; + if (buffer_len(&c->input) == 0) { + debug("channel %d: input: no drain shortcut", c->self); + chan_ibuf_empty(c); + } break; default: - error("internal error: we do not read, but chan_read_failed %d for istate %d", - c->self, c->istate); + error("channel %d: internal error: we do not read, but chan_read_failed for istate %d", + c->self, c->istate); break; } } -void -chan_ibuf_empty(Channel *c) +static void +chan_ibuf_empty1(Channel *c) { + debug("channel %d: ibuf empty", c->self); 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", + c->self); return; } switch (c->istate) { case CHAN_INPUT_WAIT_DRAIN: - debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_WAIT_OCLOSE [inbuf empty, send IEOF]", c->self); - chan_send_ieof(c); + debug("channel %d: input drain -> wait_oclose", c->self); + chan_send_ieof1(c); c->istate = CHAN_INPUT_WAIT_OCLOSE; break; 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", + c->self, c->istate); break; } } - -/* events concerning the OUTPUT from channel for socket (ostate) */ -void -chan_rcvd_ieof(Channel *c) +static void +chan_rcvd_ieof1(Channel *c) { + debug("channel %d: rcvd ieof", c->self); + if (c->type != SSH_CHANNEL_OPEN) { + debug("channel %d: non-open", c->self); + if (c->istate == CHAN_INPUT_OPEN) { + debug("channel %d: non-open: input open -> wait_oclose", c->self); + chan_shutdown_read(c); + chan_send_ieof1(c); + c->istate = CHAN_INPUT_WAIT_OCLOSE; + } else { + error("channel %d: istate %d != open", c->self, c->istate); + } + if (c->ostate == CHAN_OUTPUT_OPEN) { + debug("channel %d: non-open: output open -> closed", c->self); + chan_send_oclose1(c); + c->ostate = CHAN_OUTPUT_CLOSED; + } else { + error("channel %d: ostate %d != open", c->self, c->ostate); + } + return; + } switch (c->ostate) { 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; break; 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; - chan_delete_if_full_closed(c); break; 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", + c->self, c->ostate); break; } } -void -chan_write_failed(Channel *c) +static void +chan_write_failed1(Channel *c) { + debug("channel %d: write failed", c->self); switch (c->ostate) { case CHAN_OUTPUT_OPEN: - debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_IEOF [write failed]", c->self); - chan_send_oclose(c); + debug("channel %d: output open -> wait_ieof", c->self); + chan_send_oclose1(c); c->ostate = CHAN_OUTPUT_WAIT_IEOF; break; case CHAN_OUTPUT_WAIT_DRAIN: - debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [write failed]", c->self); - chan_send_oclose(c); + debug("channel %d: output wait_drain -> closed", c->self); + chan_send_oclose1(c); c->ostate = CHAN_OUTPUT_CLOSED; - chan_delete_if_full_closed(c); break; 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", + c->self, c->ostate); break; } } -void -chan_obuf_empty(Channel *c) +static void +chan_obuf_empty1(Channel *c) { + debug("channel %d: obuf empty", c->self); 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", + c->self); return; } switch (c->ostate) { case CHAN_OUTPUT_WAIT_DRAIN: - debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [obuf empty, send OCLOSE]", c->self); - chan_send_oclose(c); + debug("channel %d: output drain -> closed", c->self); + chan_send_oclose1(c); c->ostate = CHAN_OUTPUT_CLOSED; - chan_delete_if_full_closed(c); break; 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", + c->self, c->ostate); break; } } - -/* - * ACTIONS: should never update the channel states: c->istate or c->ostate - */ static void -chan_send_ieof(Channel *c) +chan_send_ieof1(Channel *c) { + debug("channel %d: send ieof", c->self); switch (c->istate) { case CHAN_INPUT_OPEN: case CHAN_INPUT_WAIT_DRAIN: @@ -182,13 +231,15 @@ chan_send_ieof(Channel *c) packet_send(); break; 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", + c->self, c->istate); break; } } static void -chan_send_oclose(Channel *c) +chan_send_oclose1(Channel *c) { + debug("channel %d: send oclose", c->self); switch (c->ostate) { case CHAN_OUTPUT_OPEN: case CHAN_OUTPUT_WAIT_DRAIN: @@ -199,40 +250,246 @@ chan_send_oclose(Channel *c) packet_send(); break; 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", + c->self, c->ostate); break; } } +static void +chan_delete_if_full_closed1(Channel *c) +{ + if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { + debug("channel %d: full closed", c->self); + channel_free(c->self); + } +} -/* helper */ +/* + * the same for SSH2 + */ static void -chan_shutdown_write(Channel *c) +chan_rcvd_oclose2(Channel *c) { - /* shutdown failure is allowed if write failed already */ - debug("channel %d: shutdown_write", c->self); - if (shutdown(c->sock, SHUT_WR) < 0) - debug("chan_shutdown_write failed for #%d/fd%d: %.100s", - c->self, c->sock, strerror(errno)); + debug("channel %d: rcvd close", c->self); + 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 */ + c->ostate = CHAN_OUTPUT_CLOSED; + c->istate = 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 */ + debug("channel %d: output open -> drain", c->self); + c->ostate = CHAN_OUTPUT_WAIT_DRAIN; + break; + } + switch (c->istate) { + case CHAN_INPUT_OPEN: + debug("channel %d: input open -> closed", c->self); + chan_shutdown_read(c); + break; + case CHAN_INPUT_WAIT_DRAIN: + debug("channel %d: input drain -> closed", c->self); + chan_send_eof2(c); + break; + } + c->istate = CHAN_INPUT_CLOSED; } static void -chan_shutdown_read(Channel *c) +chan_ibuf_empty2(Channel *c) +{ + debug("channel %d: ibuf empty", c->self); + if (buffer_len(&c->input)) { + error("channel %d: internal error: chan_ibuf_empty for non empty buffer", + c->self); + return; + } + switch (c->istate) { + case CHAN_INPUT_WAIT_DRAIN: + debug("channel %d: input drain -> closed", c->self); + if (!(c->flags & CHAN_CLOSE_SENT)) + chan_send_eof2(c); + c->istate = CHAN_INPUT_CLOSED; + break; + default: + error("channel %d: internal error: chan_ibuf_empty for istate %d", + c->self, c->istate); + break; + } +} +static void +chan_rcvd_ieof2(Channel *c) +{ + debug("channel %d: rcvd eof", c->self); + if (c->ostate == CHAN_OUTPUT_OPEN) { + debug("channel %d: output open -> drain", c->self); + c->ostate = CHAN_OUTPUT_WAIT_DRAIN; + } +} +static void +chan_write_failed2(Channel *c) { - debug("channel %d: shutdown_read", c->self); - if (shutdown(c->sock, SHUT_RD) < 0) - error("chan_shutdown_read failed for #%d/fd%d [i%d o%d]: %.100s", - c->self, c->sock, c->istate, c->ostate, strerror(errno)); + debug("channel %d: write failed", c->self); + switch (c->ostate) { + case CHAN_OUTPUT_OPEN: + debug("channel %d: output open -> closed", c->self); + chan_shutdown_write(c); /* ?? */ + c->ostate = CHAN_OUTPUT_CLOSED; + break; + case CHAN_OUTPUT_WAIT_DRAIN: + debug("channel %d: output drain -> closed", c->self); + chan_shutdown_write(c); + c->ostate = CHAN_OUTPUT_CLOSED; + break; + default: + error("channel %d: internal error: chan_write_failed for ostate %d", + c->self, c->ostate); + break; + } } static void -chan_delete_if_full_closed(Channel *c) +chan_obuf_empty2(Channel *c) +{ + debug("channel %d: obuf empty", c->self); + if (buffer_len(&c->output)) { + error("internal error: chan_obuf_empty %d for non empty buffer", + c->self); + return; + } + switch (c->ostate) { + case CHAN_OUTPUT_WAIT_DRAIN: + debug("channel %d: output drain -> closed", c->self); + chan_shutdown_write(c); + c->ostate = CHAN_OUTPUT_CLOSED; + break; + default: + error("channel %d: internal error: chan_obuf_empty for ostate %d", + c->self, c->ostate); + break; + } +} +static void +chan_send_eof2(Channel *c) +{ + debug("channel %d: send eof", c->self); + switch (c->istate) { + case CHAN_INPUT_WAIT_DRAIN: + packet_start(SSH2_MSG_CHANNEL_EOF); + packet_put_int(c->remote_id); + packet_send(); + break; + default: + error("channel %d: internal error: cannot send eof for istate %d", + c->self, c->istate); + break; + } +} +static void +chan_send_close2(Channel *c) +{ + debug("channel %d: send close", c->self); + if (c->ostate != CHAN_OUTPUT_CLOSED || + c->istate != CHAN_INPUT_CLOSED) { + error("channel %d: internal error: cannot send close for istate/ostate %d/%d", + c->self, c->istate, c->ostate); + } else if (c->flags & CHAN_CLOSE_SENT) { + error("channel %d: internal error: already sent close", c->self); + } else { + packet_start(SSH2_MSG_CHANNEL_CLOSE); + packet_put_int(c->remote_id); + packet_send(); + c->flags |= CHAN_CLOSE_SENT; + } +} +static void +chan_delete_if_full_closed2(Channel *c) { if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { - debug("channel %d: full closed", c->self); - channel_free(c->self); + if (!(c->flags & CHAN_CLOSE_SENT)) { + chan_send_close2(c); + } + if ((c->flags & CHAN_CLOSE_SENT) && + (c->flags & CHAN_CLOSE_RCVD)) { + debug("channel %d: full closed2", c->self); + channel_free(c->self); + } } } + +/* shared */ void chan_init_iostates(Channel *c) { c->ostate = CHAN_OUTPUT_OPEN; c->istate = CHAN_INPUT_OPEN; + c->flags = 0; +} + +/* init */ +void +chan_init(void) +{ + if (compat20) { + chan_rcvd_oclose = chan_rcvd_oclose2; + chan_read_failed = chan_read_failed_12; + chan_ibuf_empty = chan_ibuf_empty2; + + chan_rcvd_ieof = chan_rcvd_ieof2; + chan_write_failed = chan_write_failed2; + chan_obuf_empty = chan_obuf_empty2; + + chan_delete_if_full_closed = chan_delete_if_full_closed2; + } else { + chan_rcvd_oclose = chan_rcvd_oclose1; + chan_read_failed = chan_read_failed_12; + chan_ibuf_empty = chan_ibuf_empty1; + + chan_rcvd_ieof = chan_rcvd_ieof1; + chan_write_failed = chan_write_failed1; + chan_obuf_empty = chan_obuf_empty1; + + chan_delete_if_full_closed = chan_delete_if_full_closed1; + } +} + +/* helper */ +static void +chan_shutdown_write(Channel *c) +{ + buffer_consume(&c->output, buffer_len(&c->output)); + if (compat20 && c->type == SSH_CHANNEL_LARVAL) + return; + /* shutdown failure is allowed if write failed already */ + debug("channel %d: close_write", c->self); + if (c->sock != -1) { + if (shutdown(c->sock, SHUT_WR) < 0) + debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s", + c->self, c->sock, strerror(errno)); + } else { + if (close(c->wfd) < 0) + log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s", + c->self, c->wfd, strerror(errno)); + c->wfd = -1; + } +} +static void +chan_shutdown_read(Channel *c) +{ + if (compat20 && c->type == SSH_CHANNEL_LARVAL) + return; + debug("channel %d: close_read", c->self); + if (c->sock != -1) { + if (shutdown(c->sock, SHUT_RD) < 0) + error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s", + 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", + c->self, c->rfd, strerror(errno)); + c->rfd = -1; + } } |
