traceroute: do not look up icmp protocol# in /etc, it is well-known :)

diff --git a/networking/traceroute.c b/networking/traceroute.c
index 3e142d0..ceec0bc 100644 (file)
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -224,6 +224,7 @@
 #include <net/if.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <netinet/protocols.h>
 #include <netinet/udp.h>
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
@@ -921,14 +922,12 @@ int
 traceroute_main(int argc, char *argv[])
 {
        int code, n;
-       char *cp;
        unsigned char *outp;
        u_int32_t *ap;
        struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom;
        struct sockaddr_in *to = (struct sockaddr_in *)&whereto;
        struct hostinfo *hi;
        int on = 1;
-       struct protoent *pe;
        int ttl, probe, i;
        int seq = 0;
        int tos = 0;
@@ -1076,16 +1075,12 @@ traceroute_main(int argc, char *argv[])
                bb_show_usage();
        }
 
-       cp = "icmp";
-       if ((pe = getprotobyname(cp)) == NULL)
-               bb_perror_msg_and_die("unknown protocol %s", cp);
-
        /* Insure the socket fds won't be 0, 1 or 2 */
        do n = xopen(bb_dev_null, O_RDONLY); while (n < 2);
        if (n > 2)
                close(n);
 
-       s = xsocket(AF_INET, SOCK_RAW, pe->p_proto);
+       s = xsocket(AF_INET, SOCK_RAW, IP_ICMP);
 
 #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
        if (op & USAGE_OP_DEBUG)