Added regexp based screen filtering.

CHANGES

 Change log for iftop
 $Id$
 
+0.10 
+
+User selectable sort criteria
+On-the-fly filter code changes
+Shell escape
+Alternative resolver back-ends
+Improved totals display
+
 0.9 22/10/02
 
 Now works on FreeBSD

Makefile

@@ -70,9 +70,9 @@ LDLIBS += -lpcap -lcurses -lm
 
 
 SRCS = iftop.c addr_hash.c hash.c ns_hash.c resolver.c ui.c util.c sorted_list.c\
-       options.c serv_hash.c threadprof.c edline.c
+       options.c serv_hash.c threadprof.c edline.c screenfilter.c
 HDRS = addr_hash.h hash.h iftop.h ns_hash.h resolver.h sorted_list.h ui.h options.h sll.h\
-       serv_hash.h threadprof.h ether.h ip.h tcp.h
+       serv_hash.h threadprof.h ether.h ip.h tcp.h screenfilter.h
 TXTS = README CHANGES INSTALL TODO iftop.8 COPYING
 SPECFILE = iftop.spec iftop.spec.in
 

options.c

@@ -96,6 +96,7 @@ static void set_defaults() {
     options.showhelp = 0;
     options.bandwidth_in_bytes = 0;
     options.sort = OPTION_SORT_DIV2;
+    options.screenfilter = NULL;
 }
 
 static void die(char *msg) {

options.h

@@ -49,6 +49,8 @@ typedef struct {
     int bandwidth_in_bytes;
     option_sort_t sort;
 
+    char* screenfilter;
+
 } options_t;
 
 #endif /* __OPTIONS_H_ */

screenfilter.c

+/*
+ * screenfilter.c:
+ *
+ * Copyright (c) 2002 DecisionSoft Ltd.
+ * Paul Warren (pdw) Fri Oct 25 10:21:00 2002
+ *
+ */
+
+#include <sys/types.h>
+#include <regex.h>
+#include <stdio.h>
+#include "iftop.h"
+#include "options.h"
+
+static const char rcsid[] = "$Id$";
+
+extern options_t options ;
+
+regex_t preg;
+
+int screen_filter_set(char* s) {
+    int r;
+
+    if(options.screenfilter != NULL) {
+        xfree(options.screenfilter);
+        options.screenfilter = NULL;
+        regfree(&preg);
+    }
+
+    r = regcomp(&preg, s, 0);
+      
+    if(r == 0) {
+        options.screenfilter = s;
+        return 1;
+    }
+    else {
+        xfree(s);
+        return 0;
+    }
+}
+
+int screen_filter_match(char *s) {
+    int r;
+    if(options.screenfilter == NULL) {
+        return 1;
+    }
+
+    r = regexec(&preg, s, 0, NULL, 0);
+    if(r == 0) {
+        return 1;
+    }
+    else {
+        return 0;
+    }
+}
+

screenfilter.h

+/*
+ * screenfilter.h:
+ *
+ * Copyright (c) 2002 DecisionSoft Ltd.
+ * Paul Warren (pdw) Fri Oct 25 10:25:50 2002
+ *
+ * RCS: $Id$
+ */
+
+#ifndef __SCREENFILTER_H_ /* include guard */
+#define __SCREENFILTER_H_
+
+int screen_filter_set(char* s);
+int screen_filter_match(char* s);
+
+#endif /* __SCREENFILTER_H_ */

ui.c

@@ -22,6 +22,7 @@
 #include "resolver.h"
 #include "sorted_list.h"
 #include "options.h"
+#include "screenfilter.h"
 
 #define HOSTNAME_LENGTH 256
 
@@ -36,9 +37,9 @@
 " s - toggle show source host            h - toggle this help display\n"\
 " d - toggle show destination host       b - toggle bar graph display\n"\
 "                                        f - edit filter code\n"\
-"Port display:                           ! - shell command\n"\
-" R - toggle service resolution          q - quit\n"\
-" S - toggle show source port\n"\
+"Port display:                           l - set screen filter\n"\
+" R - toggle service resolution          ! - shell command\n"\
+" S - toggle show source port            q - quit\n"\
 " D - toggle show destination port\n"\
 " p - toggle port display\n"\
 "\n"\
@@ -450,7 +451,7 @@ void sprint_host(char * line, struct in_addr* addr, unsigned int port, unsigned
 
 void ui_print() {
     sorted_list_node* nn = NULL;
-    char hostname[HOSTNAME_LENGTH];
+    char host1[HOSTNAME_LENGTH], host2[HOSTNAME_LENGTH];
     static char *line;
     static int lcols;
     int y = 0;
@@ -482,17 +483,23 @@ void ui_print() {
 
       while((y < LINES - 5) && ((nn = sorted_list_next_item(&screen_list, nn)) != NULL)) {
           int x = 0, L;
+
+
           host_pair_line* screen_line = (host_pair_line*)nn->data;
 
           if(y < LINES - 5) {
               L = (COLS - 8 * HISTORY_DIVISIONS - 4) / 2;
-              if(L > sizeof hostname) {
-                  L = sizeof hostname;
+              if(L > HOSTNAME_LENGTH) {
+                  L = HOSTNAME_LENGTH;
               }
 
-              sprint_host(line, &(screen_line->ap.src), screen_line->ap.src_port, screen_line->ap.protocol, L);
+              sprint_host(host1, &(screen_line->ap.src), screen_line->ap.src_port, screen_line->ap.protocol, L);
+              sprint_host(host2, &(screen_line->ap.dst), screen_line->ap.dst_port, screen_line->ap.protocol, L);
+              if(!screen_filter_match(host1) && !screen_filter_match(host2)) {
+                continue;
+              }
 
-              mvaddstr(y, x, line);
+              mvaddstr(y, x, host1);
               x += L;
 
               mvaddstr(y, x, " => ");
@@ -500,9 +507,8 @@ void ui_print() {
 
               x += 4;
 
-              sprint_host(line, &(screen_line->ap.dst), screen_line->ap.dst_port, screen_line->ap.protocol, L);
 
-              mvaddstr(y, x, line);
+              mvaddstr(y, x, host2);
               
               draw_line_totals(y, screen_line);
 
@@ -763,7 +769,7 @@ void ui_loop() {
             case 'f': {
                 char *s;
                 dontshowdisplay = 1;
-                if ((s = edline(0, "Filter", options.filtercode))) {
+                if ((s = edline(0, "Net filter", options.filtercode))) {
                     char *m;
                     if (!(m = set_filter_code(s))) {
                         xfree(options.filtercode);
@@ -784,6 +790,17 @@ void ui_loop() {
                 dontshowdisplay = 0;
                 break;
             }
+            case 'l': {
+                char *s;
+                dontshowdisplay = 1;
+                if ((s = edline(0, "Screen filter", options.screenfilter))) {
+                    if(!screen_filter_set(s)) {
+                        showhelp("Invalid regexp");
+                    }
+                }
+                dontshowdisplay = 0;
+                break;
+            }
             case '!': {
                 char *s;
                 dontshowdisplay = 1;