Date: Tue, 2 Jun 1998 16:45:31 +0300 (EEST) From: Ruslan Ermilov <ru@ucb.crimea.ua> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/6832: [PATCH] Allows PINGing from any address on multihomed hosts Message-ID: <199806021345.QAA10870@relay.ucb.crimea.ua>
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>Number: 6832
>Category: bin
>Synopsis: [PATCH] Allows PINGing from any address on multihomed hosts
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Jun 2 06:50:00 PDT 1998
>Last-Modified:
>Originator: Ruslan Ermilov
>Organization:
United Commercial Bank
>Release: FreeBSD 2.2.6-STABLE i386
>Environment:
Fresh -stable
>Description:
The patch below allows to ping from any address on the multihomed host.
The man page is also updated, the text was cutted from traceroute(8).
>How-To-Repeat:
>Fix:
Index: ping.8
===================================================================
RCS file: /usr/FreeBSD-CVS/src/sbin/ping/ping.8,v
retrieving revision 1.3.2.6
diff -u -r1.3.2.6 ping.8
--- ping.8 1997/09/14 19:40:03 1.3.2.6
+++ ping.8 1998/06/02 13:15:12
@@ -48,6 +48,7 @@
.Op Fl l Ar preload
.Op Fl p Ar pattern
.Op Fl s Ar packetsize
+.Op Fl S Ar src_addr
.Bo
.Ar host |
.Op Fl L
@@ -194,6 +195,13 @@
with the 8 bytes of
.Tn ICMP
header data.
+.It Fl S Ar src_addr
+Use the following IP address as the source address in outgoing packets.
+On hosts with more than one IP address, this option can be used to
+force the source address to be something other than the IP address
+of the interface the probe packet is sent on. If the IP address
+is not one of this machine's interface addresses, an error is
+returned and nothing is sent.
.It Fl T Ar ttl
Set the IP Time To Live for multicasted packets.
This flag only applies if the ping destination is a multicast address.
Index: ping.c
===================================================================
RCS file: /usr/FreeBSD-CVS/src/sbin/ping/ping.c,v
retrieving revision 1.8.2.16
diff -u -r1.8.2.16 ping.c
--- ping.c 1998/05/25 20:21:34 1.8.2.16
+++ ping.c 1998/06/02 12:25:05
@@ -184,14 +184,14 @@
{
struct timeval last, intvl;
struct hostent *hp;
- struct sockaddr_in *to;
+ struct sockaddr_in *to, sin;
struct termios ts;
register int i;
int ch, hold, packlen, preload, sockerrno, almost_done = 0;
struct in_addr ifaddr;
unsigned char ttl, loop;
u_char *datap, *packet;
- char *target, hnamebuf[MAXHOSTNAMELEN];
+ char *source = NULL, *target, hnamebuf[MAXHOSTNAMELEN];
char *ep;
u_long ultmp;
#ifdef IP_OPTIONS
@@ -217,7 +217,7 @@
preload = 0;
datap = &outpack[8 + sizeof(struct timeval)];
- while ((ch = getopt(argc, argv, "I:LQRT:c:adfi:l:np:qrs:v")) != -1) {
+ while ((ch = getopt(argc, argv, "I:LQRS:T:c:adfi:l:np:qrs:v")) != -1) {
switch(ch) {
case 'a':
options |= F_AUDIBLE;
@@ -301,6 +301,9 @@
optarg);
datalen = ultmp;
break;
+ case 'S':
+ source = optarg;
+ break;
case 'T': /* multicast TTL */
ultmp = strtoul(optarg, &ep, 0);
if (*ep || ep == optarg || ultmp > 255)
@@ -322,6 +325,24 @@
usage(argv[0]);
target = argv[optind];
+ if (source) {
+ bzero((char *)&sin, sizeof(sin));
+ sin.sin_family = AF_INET;
+ if (inet_aton(source, &sin.sin_addr) == 0) {
+ hp = gethostbyname2(source, AF_INET);
+ if (!hp)
+ errx(EX_NOHOST, "cannot resolve %s: %s",
+ source, hstrerror(h_errno));
+
+ sin.sin_len = sizeof sin;
+ if (hp->h_length > sizeof(sin.sin_addr))
+ errx(1,"gethostbyname2 returned an illegal address");
+ memcpy(&sin.sin_addr, hp->h_addr_list[0], sizeof sin.sin_addr);
+ }
+ if (bind(s, (struct sockaddr *)&sin, sizeof sin) == -1)
+ err(1, "bind");
+ }
+
bzero((char *)&whereto, sizeof(struct sockaddr));
to = (struct sockaddr_in *)&whereto;
to->sin_family = AF_INET;
@@ -1251,6 +1272,7 @@
fprintf(stderr,
"usage: %s [-QRadfnqrv] [-c count] [-i wait] [-l preload] "
"[-p pattern]\n [-s packetsize] "
+ "[-S src_addr]\n "
"[host | [-L] [-I iface] [-T ttl] mcast-group]\n",
argv0);
exit(EX_USAGE);
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