From 3b670d09a83d2d625a80e2c61dc206334fb84be4 Mon Sep 17 00:00:00 2001 From: Ben Lindstrom Date: Sat, 9 Jun 2001 00:57:39 +0000 Subject: - (bal) Ooops.. nchan.c resync from OpenBSD ssh Attic. --- nchan.c | 97 +++++++++++++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 68 insertions(+), 29 deletions(-) (limited to 'nchan.c') diff --git a/nchan.c b/nchan.c index 3f996f5b8..6871cd86b 100644 --- a/nchan.c +++ b/nchan.c @@ -30,10 +30,35 @@ RCSID("$OpenBSD: nchan.c,v 1.28 2001/05/31 10:30:16 markus Exp $"); #include "buffer.h" #include "packet.h" #include "channels.h" -#include "nchan.h" #include "compat.h" #include "log.h" +/* + * SSH Protocol 1.5 aka New Channel Protocol + * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored. + * Written by Markus Friedl in October 1999 + * + * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the + * tear down of channels: + * + * 1.3: strict request-ack-protocol: + * CLOSE -> + * <- CLOSE_CONFIRM + * + * 1.5: uses variations of: + * IEOF -> + * <- OCLOSE + * <- IEOF + * OCLOSE -> + * i.e. both sides have to close the channel + * + * 2.0: the EOF messages are optional + * + * See the debugging output from 'ssh -v' and 'sshd -d' of + * ssh-1.2.27 as an example. + * + */ + /* functions manipulating channel states */ /* * EVENTS update channel input/output states execute ACTIONS @@ -84,7 +109,7 @@ chan_rcvd_oclose1(Channel *c) c->istate = CHAN_INPUT_CLOSED; break; default: - error("channel %d: protocol error: chan_rcvd_oclose for istate %d", + error("channel %d: protocol error: rcvd_oclose for istate %d", c->self, c->istate); return; } @@ -98,13 +123,15 @@ chan_read_failed_12(Channel *c) debug("channel %d: input open -> drain", c->self); chan_shutdown_read(c); c->istate = CHAN_INPUT_WAIT_DRAIN; +#if 0 if (buffer_len(&c->input) == 0) { debug("channel %d: input: no drain shortcut", c->self); chan_ibuf_empty(c); } +#endif break; default: - error("channel %d: internal error: we do not read, but chan_read_failed for istate %d", + error("channel %d: chan_read_failed for istate %d", c->self, c->istate); break; } @@ -114,7 +141,7 @@ chan_ibuf_empty1(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", + error("channel %d: chan_ibuf_empty for non empty buffer", c->self); return; } @@ -125,7 +152,7 @@ chan_ibuf_empty1(Channel *c) c->istate = CHAN_INPUT_WAIT_OCLOSE; break; default: - error("channel %d: internal error: chan_ibuf_empty for istate %d", + error("channel %d: chan_ibuf_empty for istate %d", c->self, c->istate); break; } @@ -137,19 +164,23 @@ chan_rcvd_ieof1(Channel *c) 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); + 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); + error("channel %d: non-open: istate %d != open", + c->self, c->istate); } if (c->ostate == CHAN_OUTPUT_OPEN) { - debug("channel %d: non-open: output open -> closed", c->self); + 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); + error("channel %d: non-open: ostate %d != open", + c->self, c->ostate); } return; } @@ -163,7 +194,7 @@ chan_rcvd_ieof1(Channel *c) c->ostate = CHAN_OUTPUT_CLOSED; break; default: - error("channel %d: protocol error: chan_rcvd_ieof for ostate %d", + error("channel %d: protocol error: rcvd_ieof for ostate %d", c->self, c->ostate); break; } @@ -184,7 +215,7 @@ chan_write_failed1(Channel *c) c->ostate = CHAN_OUTPUT_CLOSED; break; default: - error("channel %d: internal error: chan_write_failed for ostate %d", + error("channel %d: chan_write_failed for ostate %d", c->self, c->ostate); break; } @@ -194,7 +225,7 @@ chan_obuf_empty1(Channel *c) { debug("channel %d: obuf empty", c->self); if (buffer_len(&c->output)) { - error("channel %d: internal error: chan_obuf_empty for non empty buffer", + error("channel %d: chan_obuf_empty for non empty buffer", c->self); return; } @@ -205,7 +236,7 @@ chan_obuf_empty1(Channel *c) c->ostate = CHAN_OUTPUT_CLOSED; break; default: - error("channel %d: internal error: chan_obuf_empty for ostate %d", + error("channel %d: internal error: obuf_empty for ostate %d", c->self, c->ostate); break; } @@ -222,7 +253,7 @@ chan_send_ieof1(Channel *c) packet_send(); break; default: - error("channel %d: internal error: cannot send ieof for istate %d", + error("channel %d: cannot send ieof for istate %d", c->self, c->istate); break; } @@ -241,7 +272,7 @@ chan_send_oclose1(Channel *c) packet_send(); break; default: - error("channel %d: internal error: cannot send oclose for ostate %d", + error("channel %d: cannot send oclose for ostate %d", c->self, c->ostate); break; } @@ -265,7 +296,10 @@ chan_rcvd_oclose2(Channel *c) } switch (c->ostate) { case CHAN_OUTPUT_OPEN: - /* wait until a data from the channel is consumed if a CLOSE is received */ + /* + * 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; @@ -287,7 +321,7 @@ 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", + error("channel %d: chan_ibuf_empty for non empty buffer", c->self); return; } @@ -299,7 +333,7 @@ chan_ibuf_empty2(Channel *c) c->istate = CHAN_INPUT_CLOSED; break; default: - error("channel %d: internal error: chan_ibuf_empty for istate %d", + error("channel %d: chan_ibuf_empty for istate %d", c->self, c->istate); break; } @@ -329,7 +363,7 @@ chan_write_failed2(Channel *c) c->ostate = CHAN_OUTPUT_CLOSED; break; default: - error("channel %d: internal error: chan_write_failed for ostate %d", + error("channel %d: chan_write_failed for ostate %d", c->self, c->ostate); break; } @@ -339,7 +373,7 @@ 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", + error("channel %d: chan_obuf_empty for non empty buffer", c->self); return; } @@ -350,7 +384,7 @@ chan_obuf_empty2(Channel *c) c->ostate = CHAN_OUTPUT_CLOSED; break; default: - error("channel %d: internal error: chan_obuf_empty for ostate %d", + error("channel %d: chan_obuf_empty for ostate %d", c->self, c->ostate); break; } @@ -366,7 +400,7 @@ chan_send_eof2(Channel *c) packet_send(); break; default: - error("channel %d: internal error: cannot send eof for istate %d", + error("channel %d: cannot send eof for istate %d", c->self, c->istate); break; } @@ -377,10 +411,10 @@ 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", + error("channel %d: 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); + error("channel %d: already sent close", c->self); } else { packet_start(SSH2_MSG_CHANNEL_CLOSE); packet_put_int(c->remote_id); @@ -480,11 +514,13 @@ chan_shutdown_write(Channel *c) 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", + 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", + log("channel %d: chan_shutdown_write: " + "close() failed for fd%d: %.100s", c->self, c->wfd, strerror(errno)); c->wfd = -1; } @@ -503,11 +539,14 @@ chan_shutdown_read(Channel *c) */ if (shutdown(c->sock, SHUT_RD) < 0 && (errno != ENOTCONN && errno != EINVAL)) - 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)); + 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", + log("channel %d: chan_shutdown_read: " + "close() failed for fd%d: %.100s", c->self, c->rfd, strerror(errno)); c->rfd = -1; } -- cgit v1.2.3