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This is probably the wrong forum for this, a small patch for arping.
However:
- the guy who wrote arping, part of iputils, also wrote iproute2
- that guy is pretty much unreachable -- or I have to presume so,
because his ftp site, the main site for his work, has been broken for
months now
- I don't know where else to send it
- it might be useful to someone else
It's just a fix for an annoyance -- you should be able to arping from a
source address you don't actually have. Don't ask me why one would want
to do this; it solves a detailed problem I have, and I can't be the only
one.
Btw, if you're interested enough to have read this far, this patches
cleanly over the RedHat 8.0-patched version of arping. It adds one
option, -B, which means, "don't bother trying to bind, just do your
business."
-Steve
--- arping.c 2003-02-13 00:45:26.000000000 -0800
+++ arping.c.new 2003-02-13 00:44:45.000000000 -0800
@@ -38,6 +38,7 @@
char *device="eth0";
int ifindex;
char *source;
+int nobind=0;
struct in_addr src, dst;
char *target;
int dad, unsolicited, advert;
@@ -62,7 +63,7 @@
void usage(void)
{
fprintf(stderr,
- "Usage: arping [-fqbDUAV] [-c count] [-w timeout] [-I device] [-s source] destination\n"
+ "Usage: arping [-fqbDUAVB] [-c count] [-w timeout] [-I device] [-s source] destination\n"
" -f : quit on first reply\n"
" -q : be quiet\n"
" -b : keep broadcasting, don't go unicast\n"
@@ -70,6 +71,7 @@
" -U : Unsolicited ARP mode, update your neighbours\n"
" -A : ARP answer mode, update your neighbours\n"
" -V : print version and exit\n"
+ " -B : do not try to bind to source address\n"
" -c count : how many packets to send\n"
" -w timeout : how long to wait for a reply\n"
" -I device : which ethernet device to use (eth0)\n"
@@ -306,7 +308,7 @@
setuid(uid);
- while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:V")) != EOF) {
+ while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:VB")) != EOF) {
switch(ch) {
case 'b':
broadcast_only=1;
@@ -340,6 +342,9 @@
case 's':
source = optarg;
break;
+ case 'B':
+ nobind = 1;
+ break;
case 'V':
printf("arping utility, iputils-ss%s\n", SNAPSHOT);
exit(0);
@@ -428,7 +433,7 @@
saddr.sin_family = AF_INET;
if (src.s_addr) {
saddr.sin_addr = src;
- if (bind(probe_fd, (struct sockaddr*)&saddr, sizeof(saddr)) == -1) {
+ if (!nobind && bind(probe_fd, (struct sockaddr*)&saddr, sizeof(saddr)) == -1) {
perror("bind");
exit(2);
}
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This is probably the wrong forum for this, a small patch for arping.
However:<br>
<br>
- the guy who wrote arping, part of iputils, also wrote iproute2<br>
- that guy is pretty much unreachable -- or I have to presume so,
because his ftp site, the main site for his work, has been broken for
months now<br>
- I don't know where else to send it<br>
- it might be useful to someone else<br>
<br>
It's just a fix for an annoyance -- you should be able to arping from a
source address you don't actually have. Don't ask me why one would want
to do this; it solves a detailed problem I have, and I can't be the
only one.<br>
<br>
Btw, if you're interested enough to have read this far, this patches
cleanly over the RedHat 8.0-patched version of arping. It adds one
option, -B, which means, "don't bother trying to bind, just do your
business."<br>
<br>
-Steve<br>
<br>
<br>
<div class="moz-text-plain" wrap="true" graphical-quote="true"
style="font-family: -moz-fixed; font-size: 14px;" lang="x-western">
<pre wrap="">--- arping.c 2003-02-13 00:45:26.000000000 -0800
+++ arping.c.new 2003-02-13 00:44:45.000000000 -0800
@@ -38,6 +38,7 @@
char *device="eth0";
int ifindex;
char *source;
+int nobind=0;
struct in_addr src, dst;
char *target;
int dad, unsolicited, advert;
@@ -62,7 +63,7 @@
void usage(void)
{
fprintf(stderr,
- "Usage: arping [-fqbDUAV] [-c count] [-w timeout] [-I device] [-s source] destination\n"
+ "Usage: arping [-fqbDUAVB] [-c count] [-w timeout] [-I device] [-s source] destination\n"
" -f : quit on first reply\n"
" -q : be quiet\n"
" -b : keep broadcasting, don't go unicast\n"
@@ -70,6 +71,7 @@
" -U : Unsolicited ARP mode, update your neighbours\n"
" -A : ARP answer mode, update your neighbours\n"
" -V : print version and exit\n"
+ " -B : do not try to bind to source address\n"
" -c count : how many packets to send\n"
" -w timeout : how long to wait for a reply\n"
" -I device : which ethernet device to use (eth0)\n"
@@ -306,7 +308,7 @@
setuid(uid);
- while ((ch = getopt(argc, argv, "h?<a class="moz-txt-link-freetext"
href="bfDUAqc:w:s:I:V">bfDUAqc:w:s:I:V</a>")) != EOF) {
+ while ((ch = getopt(argc, argv, "h?<a class="moz-txt-link-freetext"
href="bfDUAqc:w:s:I:VB">bfDUAqc:w:s:I:VB</a>")) != EOF) {
switch(ch) {
case 'b':
broadcast_only=1;
@@ -340,6 +342,9 @@
case 's':
source = optarg;
break;
+ case 'B':
+ nobind = 1;
+ break;
case 'V':
printf("arping utility, iputils-ss%s\n", SNAPSHOT);
exit(0);
@@ -428,7 +433,7 @@
saddr.sin_family = AF_INET;
if (src.s_addr) {
saddr.sin_addr = src;
- if (bind(probe_fd, (struct sockaddr*)&saddr, sizeof(saddr)) == -1) {
+ if (!nobind && bind(probe_fd, (struct sockaddr*)&saddr, sizeof(saddr)) == -1) {
perror("bind");
exit(2);
}
</pre>
</div>
<br>
</body>
</html>
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