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mirror of https://git.tartarus.org/simon/putty.git synced 2025-01-09 17:38:00 +00:00

Ronald Landheer-Cieslak points out that the various back ends which

treat all socket closures as clean exits (because the protocol doesn't
provide for transferring a process exit code) could usefully at least
treat _socket errors_ as unclean exits. Patch the Telnet, Rlogin and
Raw backends to retain that information and return INT_MAX to the
frontend.

I wasn't sure whether it was better to solve this by modifying each
affected frontend, or each affected backend. I chose the latter, but
neither is really ideal; this is the sort of thing that makes me wish
we had a piece of fixed middleware in between, independent of both
platform and protocol.

[originally from svn r9730]
This commit is contained in:
Simon Tatham 2012-12-22 09:40:47 +00:00
parent 9a7dd918da
commit 38b668648a
3 changed files with 20 additions and 0 deletions

6
raw.c
View File

@ -4,6 +4,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include "putty.h"
@ -21,6 +22,7 @@ typedef struct raw_backend_data {
/* the above field _must_ be first in the structure */
Socket s;
int closed_on_socket_error;
int bufsize;
void *frontend;
int sent_console_eof, sent_socket_eof;
@ -75,6 +77,7 @@ static int raw_closing(Plug plug, const char *error_msg, int error_code,
if (raw->s) {
sk_close(raw->s);
raw->s = NULL;
raw->closed_on_socket_error = TRUE;
notify_remote_exit(raw->frontend);
}
logevent(raw->frontend, error_msg);
@ -139,6 +142,7 @@ static const char *raw_init(void *frontend_handle, void **backend_handle,
raw = snew(struct raw_backend_data);
raw->fn = &fn_table;
raw->s = NULL;
raw->closed_on_socket_error = FALSE;
*backend_handle = raw;
raw->sent_console_eof = raw->sent_socket_eof = FALSE;
@ -306,6 +310,8 @@ static int raw_exitcode(void *handle)
Raw raw = (Raw) handle;
if (raw->s != NULL)
return -1; /* still connected */
else if (raw->closed_on_socket_error)
return INT_MAX; /* a socket error counts as an unclean exit */
else
/* Exit codes are a meaningless concept in the Raw protocol */
return 0;

View File

@ -4,6 +4,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <ctype.h>
#include "putty.h"
@ -22,6 +23,7 @@ typedef struct rlogin_tag {
/* the above field _must_ be first in the structure */
Socket s;
int closed_on_socket_error;
int bufsize;
int firstbyte;
int cansize;
@ -72,6 +74,8 @@ static int rlogin_closing(Plug plug, const char *error_msg, int error_code,
if (rlogin->s) {
sk_close(rlogin->s);
rlogin->s = NULL;
if (error_msg)
rlogin->closed_on_socket_error = TRUE;
notify_remote_exit(rlogin->frontend);
}
if (error_msg) {
@ -175,6 +179,7 @@ static const char *rlogin_init(void *frontend_handle, void **backend_handle,
rlogin = snew(struct rlogin_tag);
rlogin->fn = &fn_table;
rlogin->s = NULL;
rlogin->closed_on_socket_error = FALSE;
rlogin->frontend = frontend_handle;
rlogin->term_width = conf_get_int(conf, CONF_width);
rlogin->term_height = conf_get_int(conf, CONF_height);
@ -392,6 +397,8 @@ static int rlogin_exitcode(void *handle)
Rlogin rlogin = (Rlogin) handle;
if (rlogin->s != NULL)
return -1; /* still connected */
else if (rlogin->closed_on_socket_error)
return INT_MAX; /* a socket error counts as an unclean exit */
else
/* If we ever implement RSH, we'll probably need to do this properly */
return 0;

View File

@ -4,6 +4,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include "putty.h"
@ -181,6 +182,7 @@ typedef struct telnet_tag {
/* the above field _must_ be first in the structure */
Socket s;
int closed_on_socket_error;
void *frontend;
void *ldisc;
@ -676,6 +678,8 @@ static int telnet_closing(Plug plug, const char *error_msg, int error_code,
if (telnet->s) {
sk_close(telnet->s);
telnet->s = NULL;
if (error_msg)
telnet->closed_on_socket_error = TRUE;
notify_remote_exit(telnet->frontend);
}
if (error_msg) {
@ -729,6 +733,7 @@ static const char *telnet_init(void *frontend_handle, void **backend_handle,
telnet->fn = &fn_table;
telnet->conf = conf_copy(conf);
telnet->s = NULL;
telnet->closed_on_socket_error = FALSE;
telnet->echoing = TRUE;
telnet->editing = TRUE;
telnet->activated = FALSE;
@ -1096,6 +1101,8 @@ static int telnet_exitcode(void *handle)
Telnet telnet = (Telnet) handle;
if (telnet->s != NULL)
return -1; /* still connected */
else if (telnet->closed_on_socket_error)
return INT_MAX; /* a socket error counts as an unclean exit */
else
/* Telnet doesn't transmit exit codes back to the client */
return 0;