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propagate from branch 'au.asn.ucc.matt.dropbear' (head 31dcd7a22983ef19d6c63248e415e71d292dd0ec)

Browse Source 
to branch 'au.asn.ucc.matt.dropbear.channel-fix' (head 7559a8cc4f6abe2338636f2aced3a395a79c172c)

--HG--
branch : channel-fix
extra : convert_revision : a94c5265558121fe936519b5d9a5eb27f95e9d9d
This commit is contained in:
Matt Johnston 2006-10-12 03:01:10 +00:00
commit 71e25058c1
5 changed files with 185 additions and 271 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
channel.h
View File

@ -73,10 +73,9 @@ struct Channel {
circbuffer *extrabuf; /* extended-data for the program - used like writebuf
but for stderr */
int sentclosed, recvclosed;
/* this is set when we receive/send a channel eof packet */
int recveof, senteof;
/* whether close/eof messages have been exchanged */
int sent_close, recv_close;
int recv_eof, sent_eof;
int initconn; /* used for TCP forwarding, whether the channel has been
fully initialised */
@ -94,7 +93,7 @@ struct ChanType {
int sepfds; /* Whether this channel has seperate pipes for in/out or not */
char *name;
int (*inithandler)(struct Channel*);
int (*checkclose)(struct Channel*);
int (*check_close)(struct Channel*);
void (*reqhandler)(struct Channel*);
void (*closehandler)(struct Channel*);

3
cli-channel.c
View File

@ -39,9 +39,6 @@ void recv_msg_channel_extended_data() {
TRACE(("enter recv_msg_channel_extended_data"))
channel = getchannel();
if (channel == NULL) {
dropbear_exit("Unknown channel");
}
if (channel->type != &clichansess) {
TRACE(("leave recv_msg_channel_extended_data: chantype is wrong"))

438
common-channel.c
View File

@ -43,18 +43,15 @@ static void send_msg_channel_open_confirmation(struct Channel* channel,
static void writechannel(struct Channel* channel, int fd, circbuffer *cbuf);
static void send_msg_channel_window_adjust(struct Channel *channel,
unsigned int incr);
static void send_msg_channel_data(struct Channel *channel, int isextended,
unsigned int exttype);
static void send_msg_channel_data(struct Channel *channel, int isextended);
static void send_msg_channel_eof(struct Channel *channel);
static void send_msg_channel_close(struct Channel *channel);
static void removechannel(struct Channel *channel);
static void deletechannel(struct Channel *channel);
static void checkinitdone(struct Channel *channel);
static void checkclose(struct Channel *channel);
static void closewritefd(struct Channel * channel);
static void closereadfd(struct Channel * channel, int fd);
static void closechanfd(struct Channel *channel, int fd, int how);
static void remove_channel(struct Channel *channel);
static void delete_channel(struct Channel *channel);
static void check_in_progress(struct Channel *channel);
static unsigned int write_pending(struct Channel * channel);
static void check_close(struct Channel *channel);
static void close_chan_fd(struct Channel *channel, int fd, int how);
#define FD_UNINIT (-2)
#define FD_CLOSED (-1)
@ -85,7 +82,7 @@ void chancleanup() {
for (i = 0; i < ses.chansize; i++) {
if (ses.channels[i] != NULL) {
TRACE(("channel %d closing", i))
removechannel(ses.channels[i]);
remove_channel(ses.channels[i]);
}
}
m_free(ses.channels);
@ -135,8 +132,8 @@ struct Channel* newchannel(unsigned int remotechan,
newchan = (struct Channel*)m_malloc(sizeof(struct Channel));
newchan->type = type;
newchan->index = i;
newchan->sentclosed = newchan->recvclosed = 0;
newchan->senteof = newchan->recveof = 0;
newchan->sent_close = newchan->recv_close = 0;
newchan->sent_eof = newchan->recv_eof = 0;
newchan->remotechan = remotechan;
newchan->transwindow = transwindow;
@ -164,26 +161,35 @@ struct Channel* newchannel(unsigned int remotechan,
}
/* Returns the channel structure corresponding to the channel in the current
* data packet (ses.payload must be positioned appropriately) */
struct Channel* getchannel() {
* data packet (ses.payload must be positioned appropriately).
* A valid channel is always returns, it will fail fatally with an unknown
* channel */
static struct Channel* getchannel_msg(const char* kind) {
unsigned int chan;
chan = buf_getint(ses.payload);
if (chan >= ses.chansize || ses.channels[chan] == NULL) {
return NULL;
if (kind) {
dropbear_exit("%s for unknown channel %d", kind, chan);
} else {
dropbear_exit("Unknown channel %d", chan);
}
}
return ses.channels[chan];
}
struct Channel* getchannel() {
return getchannel_msg(NULL);
}
/* Iterate through the channels, performing IO if available */
void channelio(fd_set *readfds, fd_set *writefds) {
struct Channel *channel;
unsigned int i;
int ret;
/* iterate through all the possible channels */
/* foreach channel */
for (i = 0; i < ses.chansize; i++) {
channel = ses.channels[i];
@ -194,40 +200,22 @@ void channelio(fd_set *readfds, fd_set *writefds) {
/* read data and send it over the wire */
if (channel->readfd >= 0 && FD_ISSET(channel->readfd, readfds)) {
send_msg_channel_data(channel, 0, 0);
send_msg_channel_data(channel, 0);
}
/* read stderr data and send it over the wire */
if (channel->extrabuf == NULL &&
channel->errfd >= 0 && FD_ISSET(channel->errfd, readfds)) {
send_msg_channel_data(channel, 1, SSH_EXTENDED_DATA_STDERR);
}
/* if we can read from the writefd, it might be closed, so we try to
* see if it has errors */
if (IS_DROPBEAR_SERVER && channel->writefd >= 0
&& channel->writefd != channel->readfd
&& FD_ISSET(channel->writefd, readfds)) {
if (channel->initconn) {
/* Handling for "in progress" connection - this is needed
* to avoid spinning 100% CPU when we connect to a server
* which doesn't send anything (tcpfwding) */
checkinitdone(channel);
continue; /* Important not to use the channel after
checkinitdone(), as it may be NULL */
}
ret = write(channel->writefd, NULL, 0); /* Fake write */
if (ret < 0 && errno != EINTR && errno != EAGAIN) {
closewritefd(channel);
}
send_msg_channel_data(channel, 1);
}
/* write to program/pipe stdin */
if (channel->writefd >= 0 && FD_ISSET(channel->writefd, writefds)) {
if (channel->initconn) {
checkinitdone(channel);
/* XXX should this go somewhere cleaner? */
check_in_progress(channel);
continue; /* Important not to use the channel after
checkinitdone(), as it may be NULL */
check_in_progress(), as it may be NULL */
}
writechannel(channel, channel->writefd, channel->writebuf);
}
@ -238,10 +226,10 @@ void channelio(fd_set *readfds, fd_set *writefds) {
writechannel(channel, channel->errfd, channel->extrabuf);
}
/* now handle any of the channel-closing type stuff */
checkclose(channel);
/* handle any channel closing etc */
check_close(channel);
} /* foreach channel */
}
/* Listeners such as TCP, X11, agent-auth */
#ifdef USING_LISTENERS
@ -250,57 +238,65 @@ void channelio(fd_set *readfds, fd_set *writefds) {
}
/* do all the EOF/close type stuff checking for a channel */
static void checkclose(struct Channel *channel) {
/* Returns true if there is data remaining to be written to stdin or
* stderr of a channel's endpoint. */
static unsigned int write_pending(struct Channel * channel) {
TRACE(("checkclose: writefd %d, readfd %d, errfd %d, sentclosed %d, recvclosed %d",
if (channel->writefd >= 0 && cbuf_getused(channel->writebuf) > 0) {
return 1;
} else if (channel->errfd >= 0 && channel->extrabuf &&
cbuf_getused(channel->writebuf) > 0) {
return 1;
}
return 0;
}
/* EOF/close handling */
static void check_close(struct Channel *channel) {
TRACE(("check_close: writefd %d, readfd %d, errfd %d, sent_close %d, recv_close %d",
channel->writefd, channel->readfd,
channel->errfd, channel->sentclosed, channel->recvclosed))
channel->errfd, channel->sent_close, channel->recv_close))
TRACE(("writebuf size %d extrabuf ptr 0x%x extrabuf size %d",
cbuf_getused(channel->writebuf),
channel->writebuf,
channel->writebuf ? 0 : cbuf_getused(channel->extrabuf)))
/* server chansession channels are special, since readfd mightn't
* close in the case of "sleep 4 & echo blah" until the sleep is up */
if (channel->type->checkclose) {
if (channel->type->checkclose(channel)) {
closewritefd(channel);
closereadfd(channel, channel->readfd);
closereadfd(channel, channel->errfd);
}
/* A bit of a hack for closing up server session channels */
if (channel->writefd >= 0
&& channel->type->check_close
&& channel->type->check_close(channel)) {
TRACE(("channel->type->check_close got hit"))
close_chan_fd(channel, channel->writefd, SHUT_WR);
}
if (!channel->senteof
&& channel->readfd == FD_CLOSED
&& (channel->extrabuf != NULL || channel->errfd == FD_CLOSED)) {
send_msg_channel_eof(channel);
}
if (!channel->sentclosed
&& channel->writefd == FD_CLOSED
&& channel->readfd == FD_CLOSED
&& (channel->extrabuf != NULL || channel->errfd == FD_CLOSED)) {
send_msg_channel_close(channel);
}
/* When either party wishes to terminate the channel, it sends
* SSH_MSG_CHANNEL_CLOSE. Upon receiving this message, a party MUST
* send back a SSH_MSG_CHANNEL_CLOSE unless it has already sent this
* message for the channel. The channel is considered closed for a
* party when it has both sent and received SSH_MSG_CHANNEL_CLOSE, and
* the party may then reuse the channel number. A party MAY send
* SSH_MSG_CHANNEL_CLOSE without having sent or received
* SSH_MSG_CHANNEL_EOF.
* (from draft-ietf-secsh-connect)
*/
if (channel->recvclosed) {
if (! channel->sentclosed) {
if (channel->recv_close && !write_pending(channel)) {
if (! channel->sent_close) {
TRACE(("Sending MSG_CHANNEL_CLOSE in response to same."))
send_msg_channel_close(channel);
}
removechannel(channel);
remove_channel(channel);
return;
}
if (channel->recv_eof && !write_pending(channel)) {
close_chan_fd(channel, channel->writefd, SHUT_WR);
}
if (!channel->sent_eof
&& channel->readfd == FD_CLOSED
&& (channel->extrabuf != NULL || channel->errfd == FD_CLOSED)) {
send_msg_channel_eof(channel);
}
if (!channel->sent_close
&& channel->writefd == FD_CLOSED
&& channel->readfd == FD_CLOSED
&& (channel->extrabuf != NULL || channel->errfd == FD_CLOSED)) {
send_msg_channel_close(channel);
}
}
@ -308,36 +304,34 @@ static void checkclose(struct Channel *channel) {
* if so, set up the channel properly. Otherwise, the channel is cleaned up, so
* it is important that the channel reference isn't used after a call to this
* function */
static void checkinitdone(struct Channel *channel) {
static void check_in_progress(struct Channel *channel) {
int val;
socklen_t vallen = sizeof(val);
TRACE(("enter checkinitdone"))
TRACE(("enter check_in_progress"))
if (getsockopt(channel->writefd, SOL_SOCKET, SO_ERROR, &val, &vallen)
|| val != 0) {
send_msg_channel_open_failure(channel->remotechan,
SSH_OPEN_CONNECT_FAILED, "", "");
close(channel->writefd);
deletechannel(channel);
TRACE(("leave checkinitdone: fail"))
delete_channel(channel);
TRACE(("leave check_in_progress: fail"))
} else {
send_msg_channel_open_confirmation(channel, channel->recvwindow,
channel->recvmaxpacket);
channel->readfd = channel->writefd;
channel->initconn = 0;
TRACE(("leave checkinitdone: success"))
TRACE(("leave check_in_progress: success"))
}
}
/* Send the close message and set the channel as closed */
static void send_msg_channel_close(struct Channel *channel) {
TRACE(("enter send_msg_channel_close"))
/* XXX server */
if (channel->type->closehandler) {
channel->type->closehandler(channel);
}
@ -349,8 +343,8 @@ static void send_msg_channel_close(struct Channel *channel) {
encrypt_packet();
channel->senteof = 1;
channel->sentclosed = 1;
channel->sent_eof = 1;
channel->sent_close = 1;
TRACE(("leave send_msg_channel_close"))
}
@ -365,7 +359,7 @@ static void send_msg_channel_eof(struct Channel *channel) {
encrypt_packet();
channel->senteof = 1;
channel->sent_eof = 1;
TRACE(("leave send_msg_channel_eof"))
}
@ -385,9 +379,7 @@ static void writechannel(struct Channel* channel, int fd, circbuffer *cbuf) {
len = write(fd, cbuf_readptr(cbuf, maxlen), maxlen);
if (len <= 0) {
if (len < 0 && errno != EINTR) {
/* no more to write - we close it even if the fd was stderr, since
* that's a nasty failure too */
closewritefd(channel);
close_chan_fd(channel, fd, SHUT_WR);
}
TRACE(("leave writechannel: len <= 0"))
return;
@ -396,13 +388,6 @@ static void writechannel(struct Channel* channel, int fd, circbuffer *cbuf) {
cbuf_incrread(cbuf, len);
channel->recvdonelen += len;
if (fd == channel->writefd && cbuf_getused(cbuf) == 0 && channel->recveof) {
/* Check if we're closing up */
closewritefd(channel);
TRACE(("leave writechannel: recveof set"))
return;
}
/* Window adjust handling */
if (channel->recvdonelen >= RECV_WINDOWEXTEND) {
/* Set it back to max window */
@ -416,7 +401,6 @@ static void writechannel(struct Channel* channel, int fd, circbuffer *cbuf) {
dropbear_assert(channel->extrabuf == NULL ||
channel->recvwindow <= cbuf_getavail(channel->extrabuf));
TRACE(("leave writechannel"))
}
@ -446,19 +430,6 @@ void setchannelfds(fd_set *readfds, fd_set *writefds) {
}
}
TRACE(("writefd = %d, readfd %d, errfd %d, bufused %d",
channel->writefd, channel->readfd,
channel->errfd,
cbuf_getused(channel->writebuf) ))
/* For checking FD status (ie closure etc) - we don't actually
* read data from writefd. We don't want to do this for the client,
* since redirection to /dev/null will make it spin in the select */
if (IS_DROPBEAR_SERVER && channel->writefd >= 0
&& channel->writefd != channel->readfd) {
FD_SET(channel->writefd, readfds);
}
/* Stuff from the wire */
if ((channel->writefd >= 0 && cbuf_getused(channel->writebuf) > 0 )
|| channel->initconn) {
@ -487,18 +458,11 @@ void recv_msg_channel_eof() {
TRACE(("enter recv_msg_channel_eof"))
channel = getchannel();
if (channel == NULL) {
dropbear_exit("EOF for unknown channel");
}
channel = getchannel_msg("EOF");
channel->recveof = 1;
if (cbuf_getused(channel->writebuf) == 0
&& (channel->extrabuf == NULL
|| cbuf_getused(channel->extrabuf) == 0)) {
closewritefd(channel);
}
channel->recv_eof = 1;
check_close(channel);
TRACE(("leave recv_msg_channel_eof"))
}
@ -510,27 +474,20 @@ void recv_msg_channel_close() {
TRACE(("enter recv_msg_channel_close"))
channel = getchannel();
if (channel == NULL) {
/* disconnect ? */
dropbear_exit("Close for unknown channel");
}
channel = getchannel_msg("Close");
channel->recveof = 1;
channel->recvclosed = 1;
if (channel->sentclosed) {
removechannel(channel);
}
channel->recv_eof = 1;
channel->recv_close = 1;
check_close(channel);
TRACE(("leave recv_msg_channel_close"))
}
/* Remove a channel entry, this is only executed after both sides have sent
* channel close */
static void removechannel(struct Channel * channel) {
static void remove_channel(struct Channel * channel) {
TRACE(("enter removechannel"))
TRACE(("enter remove_channel"))
TRACE(("channel index is %d", channel->index))
cbuf_free(channel->writebuf);
@ -543,20 +500,20 @@ static void removechannel(struct Channel * channel) {
/* close the FDs in case they haven't been done
* yet (ie they were shutdown etc */
* yet (they might have been shutdown etc) */
close(channel->writefd);
close(channel->readfd);
close(channel->errfd);
channel->typedata = NULL;
deletechannel(channel);
delete_channel(channel);
TRACE(("leave removechannel"))
TRACE(("leave remove_channel"))
}
/* Remove a channel entry */
static void deletechannel(struct Channel *channel) {
static void delete_channel(struct Channel *channel) {
ses.channels[channel->index] = NULL;
m_free(channel);
@ -574,10 +531,6 @@ void recv_msg_channel_request() {
TRACE(("enter recv_msg_channel_request"))
channel = getchannel();
if (channel == NULL) {
/* disconnect ? */
dropbear_exit("Unknown channel");
}
if (channel->type->reqhandler) {
channel->type->reqhandler(channel);
@ -594,20 +547,15 @@ void recv_msg_channel_request() {
* chan is the remote channel, isextended is 0 if it is normal data, 1
* if it is extended data. if it is extended, then the type is in
* exttype */
static void send_msg_channel_data(struct Channel *channel, int isextended,
unsigned int exttype) {
static void send_msg_channel_data(struct Channel *channel, int isextended) {
buffer *buf;
int len;
unsigned int maxlen;
size_t maxlen, size_pos;
int fd;
/* TRACE(("enter send_msg_channel_data"))
TRACE(("extended = %d type = %d", isextended, exttype))*/
CHECKCLEARTOWRITE();
dropbear_assert(!channel->sentclosed);
dropbear_assert(!channel->sent_close);
if (isextended) {
fd = channel->errfd;
@ -621,40 +569,37 @@ static void send_msg_channel_data(struct Channel *channel, int isextended,
* exttype if is extended */
maxlen = MIN(maxlen,
ses.writepayload->size - 1 - 4 - 4 - (isextended ? 4 : 0));
TRACE(("maxlen %d", maxlen))
if (maxlen == 0) {
TRACE(("leave send_msg_channel_data: no window"))
return; /* the data will get written later */
}
/* read the data */
TRACE(("maxlen %d", maxlen))
buf = buf_new(maxlen);
TRACE(("buf pos %d data %x", buf->pos, buf->data))
len = read(fd, buf_getwriteptr(buf, maxlen), maxlen);
if (len <= 0) {
/* on error/eof, send eof */
if (len == 0 || errno != EINTR) {
closereadfd(channel, fd);
}
buf_free(buf);
buf = NULL;
TRACE(("leave send_msg_channel_data: read err or EOF for fd %d",
channel->index));
return;
}
buf_incrlen(buf, len);
buf_putbyte(ses.writepayload,
isextended ? SSH_MSG_CHANNEL_EXTENDED_DATA : SSH_MSG_CHANNEL_DATA);
buf_putint(ses.writepayload, channel->remotechan);
if (isextended) {
buf_putint(ses.writepayload, exttype);
buf_putint(ses.writepayload, SSH_EXTENDED_DATA_STDERR);
}
/* a dummy size first ...*/
size_pos = ses.writepayload->pos;
buf_putint(ses.writepayload, 0);
buf_putstring(ses.writepayload, buf_getptr(buf, len), len);
buf_free(buf);
buf = NULL;
/* read the data */
len = read(fd, buf_getwriteptr(ses.writepayload, maxlen), maxlen);
if (len <= 0) {
if (len == 0 || errno != EINTR) {
close_chan_fd(channel, fd, SHUT_RD);
}
ses.writepayload->len = ses.writepayload->pos = 0;
TRACE(("leave send_msg_channel_data: read err or EOF for fd %d",
channel->index));
return;
}
buf_incrwritepos(ses.writepayload, len);
/* ... real size here */
buf_setpos(ses.writepayload, size_pos);
buf_putint(ses.writepayload, len);
channel->transwindow -= len;
@ -668,9 +613,6 @@ void recv_msg_channel_data() {
struct Channel *channel;
channel = getchannel();
if (channel == NULL) {
dropbear_exit("Unknown channel");
}
common_recv_msg_channel_data(channel, channel->writefd, channel->writebuf);
}
@ -687,16 +629,19 @@ void common_recv_msg_channel_data(struct Channel *channel, int fd,
TRACE(("enter recv_msg_channel_data"))
if (channel->recveof) {
if (channel->recv_eof) {
dropbear_exit("received data after eof");
}
if (fd < 0) {
dropbear_exit("received data with bad writefd");
/* If we have encountered failed write, the far side might still
* be sending data without having yet received our close notification.
* We just drop the data. */
return;
}
datalen = buf_getint(ses.payload);
TRACE(("length %d", datalen))
maxdata = cbuf_getavail(cbuf);
@ -738,9 +683,6 @@ void recv_msg_channel_window_adjust() {
unsigned int incr;
channel = getchannel();
if (channel == NULL) {
dropbear_exit("Unknown channel");
}
incr = buf_getint(ses.payload);
TRACE(("received window increment %d", incr))
@ -767,7 +709,6 @@ static void send_msg_channel_window_adjust(struct Channel* channel,
}
/* Handle a new channel request, performing any channel-type-specific setup */
/* XXX server */
void recv_msg_channel_open() {
unsigned char *type;
@ -799,6 +740,7 @@ void recv_msg_channel_open() {
/* Get the channel type. Client and server style invokation will set up a
* different list for ses.chantypes at startup. We just iterate through
* this list and find the matching name */
/* XXX fugly */
for (cp = &ses.chantypes[0], chantype = (*cp);
chantype != NULL;
cp++, chantype = (*cp)) {
@ -824,13 +766,13 @@ void recv_msg_channel_open() {
if (channel->type->inithandler) {
ret = channel->type->inithandler(channel);
if (ret == SSH_OPEN_IN_PROGRESS) {
/* We'll send the confirmation later */
goto cleanup;
}
if (ret > 0) {
if (ret == SSH_OPEN_IN_PROGRESS) {
/* We'll send the confirmation later */
goto cleanup;
}
errtype = ret;
deletechannel(channel);
delete_channel(channel);
TRACE(("inithandler returned failure %d", ret))
goto failure;
}
@ -914,6 +856,47 @@ static void send_msg_channel_open_confirmation(struct Channel* channel,
TRACE(("leave send_msg_channel_open_confirmation"))
}
/* close a fd, how is SHUT_RD or SHUT_WR */
static void close_chan_fd(struct Channel *channel, int fd, int how) {
int closein = 0, closeout = 0;
if (channel->type->sepfds) {
TRACE(("shutdown((%d), %d)", fd, how))
shutdown(fd, how);
if (how == 0) {
closeout = 1;
} else {
closein = 1;
}
} else {
close(fd);
closein = closeout = 1;
}
if (closeout && fd == channel->readfd) {
channel->readfd = FD_CLOSED;
}
if (closeout && (channel->extrabuf == NULL) && (fd == channel->errfd)) {
channel->errfd = FD_CLOSED;
}
if (closein && fd == channel->writefd) {
channel->writefd = FD_CLOSED;
}
if (closein && (channel->extrabuf != NULL) && (fd == channel->errfd)) {
channel->errfd = FD_CLOSED;
}
/* if we called shutdown on it and all references are gone, then we
* need to close() it to stop it lingering */
if (channel->type->sepfds && channel->readfd == FD_CLOSED
&& channel->writefd == FD_CLOSED && channel->errfd == FD_CLOSED) {
close(fd);
}
}
#if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
/* Create a new channel, and start the open request. This is intended
* for X11, agent, tcp forwarding, and should be filled with channel-specific
@ -962,9 +945,6 @@ void recv_msg_channel_open_confirmation() {
TRACE(("enter recv_msg_channel_open_confirmation"))
channel = getchannel();
if (channel == NULL) {
dropbear_exit("Unknown channel");
}
if (!channel->await_open) {
dropbear_exit("unexpected channel reply");
@ -982,7 +962,7 @@ void recv_msg_channel_open_confirmation() {
if (channel->type->inithandler) {
ret = channel->type->inithandler(channel);
if (ret > 0) {
removechannel(channel);
remove_channel(channel);
TRACE(("inithandler returned failure %d", ret))
}
}
@ -997,74 +977,12 @@ void recv_msg_channel_open_failure() {
struct Channel * channel;
channel = getchannel();
if (channel == NULL) {
dropbear_exit("Unknown channel");
}
if (!channel->await_open) {
dropbear_exit("unexpected channel reply");
}
channel->await_open = 0;
removechannel(channel);
remove_channel(channel);
}
#endif /* USING_LISTENERS */
/* close a stdout/stderr fd */
static void closereadfd(struct Channel * channel, int fd) {
/* don't close it if it is the same as writefd,
* unless writefd is already set -1 */
TRACE(("enter closereadfd"))
closechanfd(channel, fd, 0);
TRACE(("leave closereadfd"))
}
/* close a stdin fd */
static void closewritefd(struct Channel * channel) {
TRACE(("enter closewritefd"))
closechanfd(channel, channel->writefd, 1);
TRACE(("leave closewritefd"))
}
/* close a fd, how is 0 for stdout/stderr, 1 for stdin */
static void closechanfd(struct Channel *channel, int fd, int how) {
int closein = 0, closeout = 0;
/* XXX server */
if (channel->type->sepfds) {
TRACE(("shutdown((%d), %d)", fd, how))
shutdown(fd, how);
if (how == 0) {
closeout = 1;
} else {
closein = 1;
}
} else {
close(fd);
closein = closeout = 1;
}
if (closeout && fd == channel->readfd) {
channel->readfd = FD_CLOSED;
}
if (closeout && (channel->extrabuf == NULL) && (fd == channel->errfd)) {
channel->errfd = FD_CLOSED;
}
if (closein && fd == channel->writefd) {
channel->writefd = FD_CLOSED;
}
if (closein && (channel->extrabuf != NULL) && (fd == channel->errfd)) {
channel->errfd = FD_CLOSED;
}
/* if we called shutdown on it and all references are gone, then we
* need to close() it to stop it lingering */
if (channel->type->sepfds && channel->readfd == FD_CLOSED
&& channel->writefd == FD_CLOSED && channel->errfd == FD_CLOSED) {
close(fd);
}
}

2
debug.h
View File

@ -39,7 +39,7 @@
* Caution: Don't use this in an unfriendly environment (ie unfirewalled),
* since the printing may not sanitise strings etc. This will add a reasonable
* amount to your executable size. */
/*#define DEBUG_TRACE */
#define DEBUG_TRACE
/* All functions writing to the cleartext payload buffer call
* CHECKCLEARTOWRITE() before writing. This is only really useful if you're

4
svr-chansession.c
View File

@ -59,7 +59,6 @@ static void send_msg_chansess_exitstatus(struct Channel * channel,
struct ChanSess * chansess);
static void send_msg_chansess_exitsignal(struct Channel * channel,
struct ChanSess * chansess);
static int sesscheckclose(struct Channel *channel);
static void get_termmodes(struct ChanSess *chansess);
@ -67,7 +66,8 @@ static void get_termmodes(struct ChanSess *chansess);
extern char** environ;
static int sesscheckclose(struct Channel *channel) {
return channel->writefd == -1;
struct ChanSess *chansess = (struct ChanSess*)channel->typedata;
return chansess->exit.exitpid != -1;
}
/* Handler for childs exiting, store the state for return to the client */