Merge remote-tracking branch 'upstream/develop' into unmalloc

Conflicts:
	src/fping.c

ci/test-2-help.pl

@@ -34,6 +34,7 @@ ${I_HELP}   -l         loop sending pings forever
    -q         quiet (don't show per-target/per-ping results)
    -Q n       same as -q, but show summary every n seconds
    -r n       number of retries (default 3)
+   -R         random packet data (to foil link data compression)
    -s         print final stats
    -S addr    set source address
    -t n       individual target initial timeout (in millisec) (default 500)

doc/fping.pod

@@ -151,6 +151,11 @@ Like B<-q>, but show summary results every n seconds.
 Retry limit (default 3). This is the number of times an attempt at pinging
 a target will be made, not including the first try. 
 
+=item B<-R>
+
+Instead of using all-zeros as the packet data, generate random bytes.
+Use to defeat, e.g., link data compression.
+
 =item B<-s>
 
 Print cumulative statistics upon exit. 
@@ -194,6 +199,15 @@ Set the IP TTL field (time to live hops).
 
 =back
 
+=head1 EXAMPLES
+
+Generate ~1000 pings per second to a host until canceled, printing statistics
+on the fly at one second intervals, and printing statistics at the end:
+
+# fping -s -l -i 1 -p 1 -T 1 -Q 1 127.0.0.1
+
+Note that ping intervals less than 10ms can only be used as root.
+
 =head1 AUTHORS
 
 =over 4

src/fping.c

@@ -301,6 +301,7 @@ int elapsed_flag, version_flag, count_flag, loop_flag;
 int per_recv_flag, report_all_rtts_flag, name_flag, addr_flag, backoff_flag;
 int multif_flag;
 int timestamp_flag = 0;
+int random_data_flag = 0;
 #if defined( DEBUG ) || defined( _DEBUG )
 int randomly_lose_flag, sent_times_flag, trace_flag, print_per_system_flag;
 int lose_factor;
@@ -321,7 +322,6 @@ void crash_and_burn( char *message );
 void errno_crash_and_burn( char *message );
 char *get_host_by_address( struct in_addr in );
 int in_cksum( unsigned short *p, int n );
-void u_sleep( int u_sec );
 int recvfrom_wto ( int s, char *buf, int len, FPING_SOCKADDR *saddr, long timo );
 void remove_job( HOST_ENTRY *h );
 int send_ping( int s, HOST_ENTRY *h );
@@ -382,7 +382,7 @@ int main( int argc, char **argv )
 
     /* get command line options */
 
-    while( ( c = getopt( argc, argv, "gedhlmnqusaAvDz:t:H:i:p:f:r:c:b:C:Q:B:S:I:T:O:" ) ) != EOF )
+    while( ( c = getopt( argc, argv, "gedhlmnqusaAvDRz:t:H:i:p:f:r:c:b:C:Q:B:S:I:T:O:" ) ) != EOF )
     {
         switch( c )
         {
@@ -478,6 +478,10 @@ int main( int argc, char **argv )
             timestamp_flag = 1;
             break;
 
+        case 'R':
+            random_data_flag = 1;
+            break;
+
         case 'l':
             loop_flag = 1;
             backoff_flag = 0;
@@ -1403,7 +1407,13 @@ int send_ping( int s, HOST_ENTRY *h )
     int myseq;
     int ret = 1;
 
-    memset( ping_buffer, 0, ping_pkt_size * sizeof( char ) );
+    if (random_data_flag) {
+        for (n = 0; n < ping_pkt_size; ++n) {
+            ping_buffer[n] = random() & 0xFF;
+        }
+    } else {
+        memset( ping_buffer, 0, ping_pkt_size * sizeof( char ) );
+    }
     icp = ( FPING_ICMPHDR* )ping_buffer;
 
     gettimeofday( &h->last_send_time, &tz );
@@ -2396,47 +2406,6 @@ char * sprint_tm( int t )
     return( buf );
 }
 
-/************************************************************
-
-  Function: u_sleep
-
-*************************************************************
-
-  Inputs:  int u_sec
-
-  Description:
-
-************************************************************/
-
-void u_sleep( int u_sec )
-{
-    int nfound;
-    struct timeval to;
-    fd_set readset, writeset;
-
-select_again:
-    to.tv_sec = u_sec / 1000000;
-    to.tv_usec = u_sec - ( to.tv_sec * 1000000 );
-
-    FD_ZERO( &readset );
-    FD_ZERO( &writeset );
-
-    nfound = select( 0, &readset, &writeset, NULL, &to );
-    if(nfound < 0) {
-	if(errno == EINTR) {
-	    /* interrupted system call: redo the select */
-	    goto select_again;
-	}
-	else {
-	    errno_crash_and_burn( "select" );
-	}
-    }
-
-    return;
-
-} /* u_sleep() */
-
-
 /************************************************************
 
   Function: recvfrom_wto
@@ -2660,6 +2629,7 @@ void usage(int is_error)
     fprintf(out, "   -q         quiet (don't show per-target/per-ping results)\n" );
     fprintf(out, "   -Q n       same as -q, but show summary every n seconds\n" );
     fprintf(out, "   -r n       number of retries (default %d)\n", DEFAULT_RETRY );
+    fprintf(out, "   -R         random packet data (to foil link data compression)\n" );
     fprintf(out, "   -s         print final stats\n" );
     fprintf(out, "   -S addr    set source address\n" );
     fprintf(out, "   -t n       individual target initial timeout (in millisec) (default %d)\n", timeout / 100 );