nhyatt/putty-source
1
0
Fork 0
mirror of https://git.tartarus.org/simon/putty.git synced 2025-07-12 16:47:42 -05:00
Code Issues Projects Releases Wiki Activity

Revamp of EOF handling in all network connections, pipes and other

Browse Source 
data channels. Should comprehensively fix 'half-closed', in principle,
though it's a big and complicated change and so there's a good chance
I've made at least one mistake somewhere.

All connections should now be rigorous about propagating end-of-file
(or end-of-data-stream, or socket shutdown, or whatever) independently
in both directions, except in frontends with no mechanism for sending
explicit EOF (e.g. interactive terminal windows) or backends which are
basically always used for interactive sessions so it's unlikely that
an application would be depending on independent EOF (telnet, rlogin).

EOF should now never accidentally be sent while there's still buffered
data to go out before it. (May help fix 'portfwd-corrupt', and also I
noticed recently that the ssh main session channel can accidentally
have MSG_EOF sent before the output bufchain is clear, leading to
embarrassment when it subsequently does send the output).

[originally from svn r9279]
This commit is contained in:
Simon Tatham
2011-09-13 11:44:03 +00:00
parent c68a646c64
commit 947962e0b9
23 changed files with 616 additions and 237 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
pscp.c
View File

@ -45,6 +45,7 @@ static int using_sftp = 0;
static Backend *back;
static void *backhandle;
static Conf *conf;
int sent_eof = FALSE;
static void source(char *src);
static void rsource(char *src);
@ -214,6 +215,19 @@ int from_backend_untrusted(void *frontend_handle, const char *data, int len)
assert(!"Unexpected call to from_backend_untrusted()");
return 0; /* not reached */
}
int from_backend_eof(void *frontend)
{
/*
* We expect to be the party deciding when to close the
* connection, so if we see EOF before we sent it ourselves, we
* should panic.
*/
if (!sent_eof) {
connection_fatal(frontend,
"Received unexpected end-of-file from server");
}
return FALSE;
}
static int ssh_scp_recv(unsigned char *buf, int len)
{
outptr = buf;
@ -298,6 +312,7 @@ static void bump(char *fmt, ...)
if (back != NULL && back->connected(backhandle)) {
char ch;
back->special(backhandle, TS_EOF);
sent_eof = TRUE;
ssh_scp_recv((unsigned char *) &ch, 1);
}
@ -2314,6 +2329,7 @@ int psftp_main(int argc, char *argv[])
if (back != NULL && back->connected(backhandle)) {
char ch;
back->special(backhandle, TS_EOF);
sent_eof = TRUE;
ssh_scp_recv((unsigned char *) &ch, 1);
}
random_save_seed();