ping: add -t TTL option

function                                             old     new   delta
common_ping_main                                    1755    1796     +41
packed_usage                                       27954   27971     +17
bbconfig_config_bz2                                 4965    4966      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 59/0)               Total: 59 bytes

Signed-off-by: Joachim Nilsson <joachim.nilsson@vmlinux.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 102 insertions, 9 deletions

diff --git a/networking/ping.c b/networking/ping.c
index 3aba4906e..8571d179b 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -29,6 +29,92 @@
 #include <netinet/ip_icmp.h>
 #include "libbb.h"
 
+//config:config PING
+//config:       bool "ping"
+//config:       default y
+//config:       depends on PLATFORM_LINUX
+//config:       help
+//config:         ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to
+//config:         elicit an ICMP ECHO_RESPONSE from a host or gateway.
+//config:
+//config:config PING6
+//config:       bool "ping6"
+//config:       default y
+//config:       depends on FEATURE_IPV6 && PING
+//config:       help
+//config:         This will give you a ping that can talk IPv6.
+//config:
+//config:config FEATURE_FANCY_PING
+//config:       bool "Enable fancy ping output"
+//config:       default y
+//config:       depends on PING
+//config:       help
+//config:         Make the output from the ping applet include statistics, and at the
+//config:         same time provide full support for ICMP packets.
+
+//applet:IF_PING(APPLET(ping, _BB_DIR_BIN, _BB_SUID_MAYBE))
+//applet:IF_PING6(APPLET(ping6, _BB_DIR_BIN, _BB_SUID_MAYBE))
+
+//kbuild:lib-$(CONFIG_PING)  += ping.o
+//kbuild:lib-$(CONFIG_PING6) += ping.o
+
+//usage:#if !ENABLE_FEATURE_FANCY_PING
+//usage:# define ping_trivial_usage
+//usage:       "HOST"
+//usage:# define ping_full_usage "\n\n"
+//usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
+//usage:# define ping6_trivial_usage
+//usage:       "HOST"
+//usage:# define ping6_full_usage "\n\n"
+//usage:       "Send ICMP ECHO_REQUEST packets to network hosts"
+//usage:#else
+//usage:# define ping_trivial_usage
+//usage:       "[OPTIONS] HOST"
+//usage:# define ping_full_usage "\n\n"
+//usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
+//usage:     "\nOptions:"
+//usage:     "\n        -4,-6           Force IP or IPv6 name resolution"
+//usage:     "\n        -c CNT          Send only CNT pings"
+//usage:     "\n        -s SIZE         Send SIZE data bytes in packets (default:56)"
+//usage:     "\n        -t TTL          Set TTL"
+//usage:     "\n        -I IFACE/IP     Use interface or IP address as source"
+//usage:     "\n        -W SEC          Seconds to wait for the first response (default:10)"
+//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                        and when finished"
+//usage:
+//usage:# define ping6_trivial_usage
+//usage:       "[OPTIONS] HOST"
+//usage:# define ping6_full_usage "\n\n"
+//usage:       "Send ICMP ECHO_REQUEST packets to network hosts\n"
+//usage:     "\nOptions:"
+//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                        and when finished"
+//usage:
+//usage:#endif
+//usage:
+//usage:#define ping_example_usage
+//usage:       "$ ping localhost\n"
+//usage:       "PING slag (127.0.0.1): 56 data bytes\n"
+//usage:       "64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=20.1 ms\n"
+//usage:       "\n"
+//usage:       "--- debian ping statistics ---\n"
+//usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
+//usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
+//usage:#define ping6_example_usage
+//usage:       "$ ping6 ip6-localhost\n"
+//usage:       "PING ip6-localhost (::1): 56 data bytes\n"
+//usage:       "64 bytes from ::1: icmp6_seq=0 ttl=64 time=20.1 ms\n"
+//usage:       "\n"
+//usage:       "--- ip6-localhost ping statistics ---\n"
+//usage:       "1 packets transmitted, 1 packets received, 0% packet loss\n"
+//usage:       "round-trip min/avg/max = 20.1/20.1/20.1 ms\n"
+
 #if ENABLE_PING6
 # include <netinet/icmp6.h>
 /* I see RENUMBERED constants in bits/in.h - !!?
@@ -223,17 +309,18 @@ static int common_ping_main(sa_family_t af, char **argv)
 
 /* Full(er) version */
 
-#define OPT_STRING ("qvc:s:w:W:I:4" IF_PING6("6"))
+#define OPT_STRING ("qvc:s:t:w:W:I:4" IF_PING6("6"))
 enum {
         OPT_QUIET = 1 << 0,
         OPT_VERBOSE = 1 << 1,
         OPT_c = 1 << 2,
         OPT_s = 1 << 3,
-        OPT_w = 1 << 4,
-        OPT_W = 1 << 5,
-        OPT_I = 1 << 6,
-        OPT_IPV4 = 1 << 7,
-        OPT_IPV6 = (1 << 8) * ENABLE_PING6,
+        OPT_t = 1 << 4,
+        OPT_w = 1 << 5,
+        OPT_W = 1 << 6,
+        OPT_I = 1 << 7,
+        OPT_IPV4 = 1 << 8,
+        OPT_IPV6 = (1 << 9) * ENABLE_PING6,
 };
 
 
@@ -244,6 +331,7 @@ struct globals {
         len_and_sockaddr *source_lsa;
         unsigned datalen;
         unsigned pingcount; /* must be int-sized */
+        unsigned opt_ttl;
         unsigned long ntransmitted, nreceived, nrepeats;
         uint16_t myid;
         unsigned tmin, tmax; /* in us */
@@ -275,6 +363,7 @@ struct globals {
 #define nreceived    (G.nreceived   )
 #define nrepeats     (G.nrepeats    )
 #define pingcount    (G.pingcount   )
+#define opt_ttl      (G.opt_ttl     )
 #define myid         (G.myid        )
 #define tmin         (G.tmin        )
 #define tmax         (G.tmax        )
@@ -586,6 +675,10 @@ static void ping4(len_and_sockaddr *lsa)
         sockopt = (datalen * 2) + 7 * 1024; /* giving it a bit of extra room */
         setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
 
+        if (opt_ttl != 0)
+                //setsockopt(pingsock, IPPROTO_IP, IP_MULTICAST_TTL, &opt_ttl, sizeof(opt_ttl));
+                setsockopt(pingsock, IPPROTO_IP, IP_TTL, &opt_ttl, sizeof(opt_ttl));
+
         signal(SIGINT, print_stats_and_exit);
 
         /* start the ping's going ... */
@@ -735,9 +828,9 @@ static int common_ping_main(int opt, char **argv)
 
         INIT_G();
 
-        /* exactly one argument needed; -v and -q don't mix; -c NUM, -w NUM, -W NUM */
-        opt_complementary = "=1:q--v:v--q:c+:w+:W+";
-        opt |= getopt32(argv, OPT_STRING, &pingcount, &str_s, &deadline, &timeout, &str_I);
+        /* 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);
         if (opt & OPT_s)
                 datalen = xatou16(str_s); // -s
         if (opt & OPT_I) { // -I