[PATCH 1/2] [iputils] Add length flag to set initial MTU.

[John Heffner]

Signed-off-by: John Heffner <[EMAIL PROTECTED]>
---
 tracepath.c  |   10 ++++++++--
 tracepath6.c |   10 ++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/tracepath.c b/tracepath.c
index c3f6f74..1f901ba 100644
--- a/tracepath.c
+++ b/tracepath.c
@@ -265,7 +265,7 @@ static void usage(void) __attribute((noreturn));
 
 static void usage(void)
 {
-       fprintf(stderr, "Usage: tracepath [-n] <destination>[/<port>]\n");
+       fprintf(stderr, "Usage: tracepath [-n] [-l <len>] 
<destination>[/<port>]\n");
        exit(-1);
 }
 
@@ -279,11 +279,17 @@ main(int argc, char **argv)
        char *p;
        int ch;
 
-       while ((ch = getopt(argc, argv, "nh?")) != EOF) {
+       while ((ch = getopt(argc, argv, "nh?l:")) != EOF) {
                switch(ch) {
                case 'n':       
                        no_resolve = 1;
                        break;
+               case 'l':
+                       if ((mtu = atoi(optarg)) <= overhead) {
+                               fprintf(stderr, "Error: length must be >= 
%d\n", overhead);
+                               exit(1);
+                       }
+                       break;
                default:
                        usage();
                }
diff --git a/tracepath6.c b/tracepath6.c
index 23d6a8c..d65230d 100644
--- a/tracepath6.c
+++ b/tracepath6.c
@@ -280,7 +280,7 @@ static void usage(void) __attribute((noreturn));
 
 static void usage(void)
 {
-       fprintf(stderr, "Usage: tracepath6 [-n] [-b] <destination>[/<port>]\n");
+       fprintf(stderr, "Usage: tracepath6 [-n] [-b] [-l <len>] 
<destination>[/<port>]\n");
        exit(-1);
 }
 
@@ -297,7 +297,7 @@ int main(int argc, char **argv)
        int gai;
        char pbuf[NI_MAXSERV];
 
-       while ((ch = getopt(argc, argv, "nbh?")) != EOF) {
+       while ((ch = getopt(argc, argv, "nbh?l:")) != EOF) {
                switch(ch) {
                case 'n':       
                        no_resolve = 1;
@@ -305,6 +305,12 @@ int main(int argc, char **argv)
                case 'b':       
                        show_both = 1;
                        break;
+               case 'l':
+                       if ((mtu = atoi(optarg)) <= overhead) {
+                               fprintf(stderr, "Error: length must be >= 
%d\n", overhead);
+                               exit(1);
+                       }
+                       break;
                default:
                        usage();
                }
-- 
1.5.0.2.gc260-dirty

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