From f9e9546ae51a4669a4783ea8d1c158c0b93456a4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Groenvall?= <bg@sics.se>
Date: Tue, 19 Dec 1995 09:31:22 +0000
Subject: [PATCH] Make popper timeout after 120 seconds.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@204 ec53bebd-3082-4978-b11e-865c3cabbd6b
---
 appl/popper/pop_init.c |  5 ++++
 appl/popper/pop_send.c |  6 +++++
 appl/popper/popper.c   | 58 +++++++++++++++++++++++++++++++++++++++---
 appl/popper/popper.h   |  5 ++++
 4 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/appl/popper/pop_init.c b/appl/popper/pop_init.c
index 6d14d6296..c1b624aac 100644
--- a/appl/popper/pop_init.c
+++ b/appl/popper/pop_init.c
@@ -84,6 +84,11 @@ char    **      argmessage;
                 trace_file_name = optarg;
                 break;
 
+            /*  Timeout value passed.  Default changed */
+            case 'T':
+                pop_timeout = atoi(optarg);
+                break;
+
             /*  Unknown option received */
             default:
                 errflag++;
diff --git a/appl/popper/pop_send.c b/appl/popper/pop_send.c
index a760536a3..7e32c5edd 100644
--- a/appl/popper/pop_send.c
+++ b/appl/popper/pop_send.c
@@ -88,6 +88,8 @@ POP     *   p;
 		strcat(tmpbuf, "\n");
 		if (strlen(tmpbuf) < MAXMSGLINELEN) {
 		    pop_sendline (p,tmpbuf);
+		    if (hangup)
+			return (pop_msg (p,POP_FAILURE,"SIGHUP or SIGPIPE flagged"));
 		    return_path_sent++;
 		}
 	    }
@@ -107,6 +109,8 @@ POP     *   p;
             end of the header.  sendline() converts this to a NULL, 
             so that's what we look for. */
         if (*buffer == 0) break;
+        if (hangup)
+          return (pop_msg (p,POP_FAILURE,"SIGHUP or SIGPIPE flagged"));
     }
     /*  Send the message body */
     while (fgets(buffer,MAXMSGLINELEN,p->drop)) {
@@ -115,6 +119,8 @@ POP     *   p;
         /*  Decrement the lines sent (for a TOP command) */
         if (msg_lines >= 0 && msg_lines-- == 0) break;
         pop_sendline(p,buffer);
+        if (hangup)
+          return (pop_msg (p,POP_FAILURE,"SIGHUP or SIGPIPE flagged"));
     }
     /*  "." signals the end of a multi-line transmission */
     (void)fputs(".\r\n",p->output);
diff --git a/appl/popper/popper.c b/appl/popper/popper.c
index 540ab0a44..b31e079eb 100644
--- a/appl/popper/popper.c
+++ b/appl/popper/popper.c
@@ -11,10 +11,52 @@ static char SccsId[] = "@(#)@(#)popper.c	2.1  2.1 3/18/91";
 
 #include <stdio.h>
 #include <sys/types.h>
+#include <signal.h>
+#include <setjmp.h>
 #include "popper.h"
 
 extern  state_table *   pop_get_command();
 
+int hangup = FALSE ;
+
+static int
+catchSIGHUP()
+{
+    hangup = TRUE ;
+
+    /* This should not be a problem on BSD systems */
+    signal(SIGHUP,  (void *)catchSIGHUP);
+    signal(SIGPIPE,  (void *)catchSIGHUP);
+}
+
+int     pop_timeout = POP_TIMEOUT;
+
+jmp_buf env;
+
+static int
+ring()
+{
+  longjmp(env,1);
+}
+  
+/*
+ * fgets, but with a timeout
+ */
+static char *
+tgets(char *str, int size, FILE *fp, int timeout)
+{
+  int ring();
+  (void) signal(SIGALRM, (void *)ring);
+  alarm(timeout);
+  if (setjmp(env))
+    str = NULL;
+  else
+    str = fgets(str,size,fp);
+  alarm(0);
+  signal(SIGALRM,SIG_DFL);
+  return(str);
+}
+
 /* 
  *  popper: Handle a Post Office Protocol version 3 session
  */
@@ -26,6 +68,9 @@ char    **  argv;
     state_table     *   s;
     char                message[MAXLINELEN];
 
+    (void) signal(SIGHUP,(void *)catchSIGHUP);
+    (void) signal(SIGPIPE,(void *)catchSIGHUP);
+
     /*  Start things rolling */
     pop_init(&p,argc,argv);
 
@@ -40,11 +85,16 @@ char    **  argv;
         until the client quits or an error occurs. */
 
     for (p.CurrentState=auth1;p.CurrentState!=halt&&p.CurrentState!=error;) {
-
-        /*  Obtain a line from the client */
-        if (fgets(message,MAXLINELEN,p.input) == NULL) {
+        if (hangup) {
+            pop_msg(&p,POP_FAILURE,"POP hangup",p.myhost);
+            if (p.CurrentState > auth2 && !pop_updt(&p))
+                pop_msg(&p,POP_FAILURE,"POP mailbox update failed.",p.myhost);
+            p.CurrentState = error;
+        } else if (tgets(message,MAXLINELEN,p.input,pop_timeout) == NULL) {
+	    pop_msg(&p,POP_FAILURE,"POP timeout",p.myhost);
+	    if (p.CurrentState > auth2 && !pop_updt(&p))
+                pop_msg(&p,POP_FAILURE,"POP mailbox update failed!",p.myhost);
             p.CurrentState = error;
-            pop_msg(&p,POP_FAILURE,"POP server at %s signing off.",p.myhost);
         }
         else {
             /*  Search for the command in the command/state table */
diff --git a/appl/popper/popper.h b/appl/popper/popper.h
index e52648a9b..6c193e246 100644
--- a/appl/popper/popper.h
+++ b/appl/popper/popper.h
@@ -75,9 +75,14 @@
 #define POP_SUCCESS     1
 #define POP_FAILURE     0
 #define POP_TERMINATE   '.'
+#define POP_TIMEOUT     120     /* timeout connection after this many secs */
 
 extern int              errno;
 
+extern int              pop_timeout;
+
+extern int              hangup;
+
 #define pop_command         pop_parm[0]     /*  POP command is first token */
 #define pop_subcommand      pop_parm[1]     /*  POP XTND subcommand is the 
                                                 second token */