ping: add -p to specify data pattern

function                                             old     new   delta
common_ping_main                                    1788    1831     +43
sendping6                                             56      82     +26
sendping4                                             82     108     +26
packed_usage                                       29959   29938     -21
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 95/-21)             Total: 74 bytes

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 16 insertions, 9 deletions

diff --git a/networking/ping.c b/networking/ping.c
index 5e4771f5a..c475395e7 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -100,8 +100,9 @@
 //usage:     "\n                        (after all -c CNT packets are sent)"
 //usage:     "\n        -w SEC          Seconds until ping exits (default:infinite)"
 //usage:     "\n                        (can exit earlier with -c CNT)"
-//usage:     "\n        -q              Quiet, only displays output at start"
+//usage:     "\n        -q              Quiet, only display output at start"
 //usage:     "\n                        and when finished"
+//usage:     "\n        -p              Pattern to use for payload"
 //usage:
 //usage:# define ping6_trivial_usage
 //usage:       "[OPTIONS] HOST"
@@ -110,8 +111,9 @@
 //usage:     "\n        -c CNT          Send only CNT pings"
 //usage:     "\n        -s SIZE         Send SIZE data bytes in packets (default:56)"
 //usage:     "\n        -I IFACE/IP     Use interface or IP address as source"
-//usage:     "\n        -q              Quiet, only displays output at start"
+//usage:     "\n        -q              Quiet, only display output at start"
 //usage:     "\n                        and when finished"
+//usage:     "\n        -p              Pattern to use for payload"
 //usage:
 //usage:#endif
 //usage:
@@ -330,7 +332,7 @@ static int common_ping_main(sa_family_t af, char **argv)
 
 /* Full(er) version */
 
-#define OPT_STRING ("qvc:s:t:w:W:I:n4" IF_PING6("6"))
+#define OPT_STRING ("qvc:s:t:w:W:I:np:4" IF_PING6("6"))
 enum {
         OPT_QUIET = 1 << 0,
         OPT_VERBOSE = 1 << 1,
@@ -341,8 +343,9 @@ enum {
         OPT_W = 1 << 6,
         OPT_I = 1 << 7,
         /*OPT_n = 1 << 8, - ignored */
-        OPT_IPV4 = 1 << 9,
-        OPT_IPV6 = (1 << 10) * ENABLE_PING6,
+        OPT_p = 1 << 9,
+        OPT_IPV4 = 1 << 10,
+        OPT_IPV6 = (1 << 11) * ENABLE_PING6,
 };
 
 
@@ -355,6 +358,7 @@ struct globals {
         unsigned opt_ttl;
         unsigned long ntransmitted, nreceived, nrepeats;
         uint16_t myid;
+        uint8_t pattern;
         unsigned tmin, tmax; /* in us */
         unsigned long long tsum; /* in us, sum of all times */
         unsigned deadline;
@@ -485,7 +489,7 @@ static void sendping4(int junk UNUSED_PARAM)
 {
         struct icmp *pkt = G.snd_packet;
 
-        //memset(pkt, 0, datalen + ICMP_MINLEN + 4); - G.snd_packet was xzalloced
+        memset(pkt, G.pattern, datalen + ICMP_MINLEN + 4);
         pkt->icmp_type = ICMP_ECHO;
         /*pkt->icmp_code = 0;*/
         pkt->icmp_cksum = 0; /* cksum is calculated with this field set to 0 */
@@ -508,7 +512,7 @@ static void sendping6(int junk UNUSED_PARAM)
 {
         struct icmp6_hdr *pkt = G.snd_packet;
 
-        //memset(pkt, 0, datalen + sizeof(struct icmp6_hdr) + 4);
+        memset(pkt, G.pattern, datalen + sizeof(struct icmp6_hdr) + 4);
         pkt->icmp6_type = ICMP6_ECHO_REQUEST;
         /*pkt->icmp6_code = 0;*/
         /*pkt->icmp6_cksum = 0;*/
@@ -850,13 +854,13 @@ static void ping(len_and_sockaddr *lsa)
 static int common_ping_main(int opt, char **argv)
 {
         len_and_sockaddr *lsa;
-        char *str_s;
+        char *str_s, *str_p;
 
         INIT_G();
 
         /* exactly one argument needed; -v and -q don't mix; -c NUM, -t NUM, -w NUM, -W NUM */
         opt_complementary = "=1:q--v:v--q:c+:t+:w+:W+";
-        opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I);
+        opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &opt_ttl, &deadline, &timeout, &str_I, &str_p);
         if (opt & OPT_s)
                 datalen = xatou16(str_s); // -s
         if (opt & OPT_I) { // -I
@@ -867,6 +871,9 @@ static int common_ping_main(int opt, char **argv)
                         str_I = NULL; /* don't try to bind to device later */
                 }
         }
+        if (opt & OPT_p)
+                G.pattern = xstrtou_range(str_p, 16, 0, 255);
+
         myid = (uint16_t) getpid();
         hostname = argv[optind];
 #if ENABLE_PING6