Cutthrough: fix race resulting in duplicate-delivery. Bug 2273

[exim.git] / src / exim_monitor / em_menu.c

diff --git a/src/exim_monitor/em_menu.c b/src/exim_monitor/em_menu.c
index 51a952e9920bdff1270322717f1a621b773004d4..8e638f07e7e162ee5f070bbe3cce948e4ab722ff 100644 (file)
--- a/src/exim_monitor/em_menu.c
+++ b/src/exim_monitor/em_menu.c
@@ -2,7 +2,7 @@
 *                  Exim Monitor                  *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -133,32 +133,33 @@ menu_is_up = FALSE;
 *          Display the message log               *
 *************************************************/
 
-static void msglogAction(Widget w, XtPointer client_data, XtPointer call_data)
+static void
+msglogAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 int i;
-uschar buffer[256];
-Widget text = text_create((uschar *)client_data, text_depth);
-FILE *f = NULL;
+Widget text = text_create(US client_data, text_depth);
+uschar * fname = NULL;
+FILE * f = NULL;
 
 w = w;      /* Keep picky compilers happy */
 call_data = call_data;
 
 /* End up with the split version, so message looks right when non-exist */
 
-for (i = 0; i < (spool_is_split? 2:1); i++)
+for (i = 0; i < (spool_is_split ? 2:1); i++)
   {
-  message_subdir[0] = (i != 0)? ((uschar *)client_data)[5] : 0;
-  sprintf(CS buffer, "%s/msglog/%s/%s", spool_directory, message_subdir,
-    (uschar *)client_data);
-  f = fopen(CS buffer, "r");
-  if (f != NULL) break;
+  message_subdir[0] = i != 0 ? (US client_data)[5] : 0;
+  fname = spool_fname(US"msglog", message_subdir, US client_data, US"");
+  if ((f = fopen(CS fname, "r")))
+    break;
   }
 
-if (f == NULL)
-  text_showf(text, "%s: %s\n", buffer, strerror(errno));
+if (!f)
+  text_showf(text, "%s: %s\n", fname, strerror(errno));
 else
   {
-  while (Ufgets(buffer, 256, f) != NULL) text_show(text, buffer);
+  uschar buffer[256];
+  while (Ufgets(buffer, sizeof(buffer), f) != NULL) text_show(text, buffer);
   fclose(f);
   }
 }
@@ -169,11 +170,11 @@ else
 *          Display the message body               *
 *************************************************/
 
-static void bodyAction(Widget w, XtPointer client_data, XtPointer call_data)
+static void
+bodyAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 int i;
-uschar buffer[256];
-Widget text = text_create((uschar *)client_data, text_depth);
+Widget text = text_create(US client_data, text_depth);
 FILE *f = NULL;
 
 w = w;      /* Keep picky compilers happy */
@@ -181,19 +182,21 @@ call_data = call_data;
 
 for (i = 0; i < (spool_is_split? 2:1); i++)
   {
-  message_subdir[0] = (i != 0)? ((uschar *)client_data)[5] : 0;
-  sprintf(CS buffer, "%s/input/%s/%s-D", spool_directory, message_subdir,
-    (uschar *)client_data);
-  f = fopen(CS buffer, "r");
-  if (f != NULL) break;
+  uschar * fname;
+  message_subdir[0] = i != 0 ? (US client_data)[5] : 0;
+  fname = spool_fname(US"input", message_subdir, US client_data, US"-D");
+  if ((f = fopen(CS fname, "r")))
+    break;
   }
 
 if (f == NULL)
   text_showf(text, "Failed to open file: %s\n", strerror(errno));
 else
   {
+  uschar buffer[256];
   int count = 0;
-  while (Ufgets(buffer, 256, f) != NULL)
+
+  while (Ufgets(buffer, sizeof(buffer), f) != NULL)
     {
     text_show(text, buffer);
     count += Ustrlen(buffer);
@@ -331,9 +334,9 @@ if (!delivery)
   if (rc == 0 && Ustrcmp(action + Ustrlen(action) - 4, "-Mes") == 0)
     {
     queue_item *q = find_queue(id, queue_noop, 0);
-    if (q != NULL)
+    if (q)
       {
-      if (q->sender != NULL) store_free(q->sender);
+      if (q->sender) store_free(q->sender);
       q->sender = store_malloc(Ustrlen(address_arg) + 1);
       Ustrcpy(q->sender, address_arg);
       }
@@ -408,7 +411,7 @@ static void deliverAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 w = w;      /* Keep picky compilers happy */
 call_data = call_data;
-ActOnMessage((uschar *)client_data, US"-v -M", US"");
+ActOnMessage(US client_data, US"-v -M", US"");
 }
 
 
@@ -421,7 +424,7 @@ static void freezeAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 w = w;      /* Keep picky compilers happy */
 call_data = call_data;
-ActOnMessage((uschar *)client_data, US"-Mf", US"");
+ActOnMessage(US client_data, US"-Mf", US"");
 }
 
 
@@ -434,7 +437,7 @@ static void thawAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 w = w;      /* Keep picky compilers happy */
 call_data = call_data;
-ActOnMessage((uschar *)client_data, US"-Mt", US"");
+ActOnMessage(US client_data, US"-Mt", US"");
 }
 
 
@@ -621,7 +624,7 @@ static void giveupAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 w = w;      /* Keep picky compilers happy */
 call_data = call_data;
-ActOnMessage((uschar *)client_data, US"-v -Mg", US"");
+ActOnMessage(US client_data, US"-v -Mg", US"");
 }
 
 
@@ -634,7 +637,7 @@ static void removeAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 w = w;      /* Keep picky compilers happy */
 call_data = call_data;
-ActOnMessage((uschar *)client_data, US"-Mrm", US"");
+ActOnMessage(US client_data, US"-Mrm", US"");
 }
 
 
@@ -647,7 +650,7 @@ static void headersAction(Widget w, XtPointer client_data, XtPointer call_data)
 {
 uschar buffer[256];
 header_line *h, *next;
-Widget text = text_create((uschar *)client_data, text_depth);
+Widget text = text_create(US client_data, text_depth);
 void *reset_point;
 
 w = w;      /* Keep picky compilers happy */
@@ -658,7 +661,7 @@ Then use Exim's function to read the header. */
 
 reset_point = store_get(0);
 
-sprintf(CS buffer, "%s-H", (uschar *)client_data);
+sprintf(CS buffer, "%s-H", US client_data);
 if (spool_read_header(buffer, TRUE, FALSE) != spool_read_OK)
   {
   if (errno == ERRNO_SPOOLFORMAT)