From 73ce2c0dc06450065945761f79cd4046b2aaa633 Mon Sep 17 00:00:00 2001
From: octo <octo>
Date: Sun, 14 May 2006 21:11:09 +0000
Subject: [PATCH] Implemented the possibility to set the buffer being sent.
 This allows larger/smaller packets to be sent.

---
 src/liboping.c           | 24 ++++++++++++++++++++----
 src/mans/ping_setopt.pod |  7 +++++++
 src/oping.h              |  2 ++
 3 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/src/liboping.c b/src/liboping.c
index de1ff02..3c63521 100644
--- a/src/liboping.c
+++ b/src/liboping.c
@@ -95,8 +95,6 @@
 
 #define PING_ERRMSG_LEN 256
 
-#define PING_DATA "Florian Forster <octo@verplant.org> http://verplant.org/"
-
 struct pinghost
 {
 	char                    *hostname;
@@ -119,6 +117,7 @@ struct pingobj
 	double      timeout;
 	int         ttl;
 	int         addrfamily;
+	char       *data;
 
 	char        errmsg[PING_ERRMSG_LEN];
 
@@ -565,7 +564,11 @@ static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
 	icmp4->icmp_id    = htons (ph->ident);
 	icmp4->icmp_seq   = htons (ph->sequence);
 
-	strcpy (data, PING_DATA);
+	buflen = 4096 - sizeof (struct icmp);
+	if (obj->data != NULL)
+		strncpy (data, obj->data, buflen);
+	else
+		strncpy (data, PING_DEF_DATA, buflen);
 	datalen = strlen (data);
 
 	buflen = datalen + sizeof (struct icmp);
@@ -610,7 +613,11 @@ static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
 	icmp6->icmp6_id    = htons (ph->ident);
 	icmp6->icmp6_seq   = htons (ph->sequence);
 
-	strcpy (data, PING_DATA);
+	buflen = 4096 - sizeof (struct icmp6_hdr);
+	if (obj->data != NULL)
+		strncpy (data, obj->data, buflen);
+	else
+		strncpy (data, PING_DEF_DATA, buflen);
 	datalen = strlen (data);
 
 	buflen = datalen + sizeof (struct icmp6_hdr);
@@ -854,6 +861,15 @@ int ping_setopt (pingobj_t *obj, int option, void *value)
 			}
 			break;
 
+		case PING_OPT_DATA:
+			if (obj->data != NULL)
+			{
+				free (obj->data);
+				obj->data = NULL;
+			}
+			obj->data = strdup ((const char *) value);
+			break;
+
 		default:
 			ret = -2;
 	} /* switch (option) */
diff --git a/src/mans/ping_setopt.pod b/src/mans/ping_setopt.pod
index 7f64b04..9c73929 100644
--- a/src/mans/ping_setopt.pod
+++ b/src/mans/ping_setopt.pod
@@ -40,6 +40,13 @@ integer and must be either B<AF_UNSPEC>, B<AF_INET>, or B<AF_INET6>. This
 option only effects hosts that are being added B<after> this option has been
 set. Default is B<PING_DEF_AF>.
 
+=item B<PING_OPT_DATA>
+
+Set the data to send. The value passed must be a char-pointer to a
+null-terminated string. By default a 56 byte long string is used so that the
+packet size of an ICMPv4 packet is exactly 64 bytes. That's the behavior of the
+L<ping(1)> command.
+
 =back
 
 The I<val> argument is a pointer to the new value. It must not be NULL. It is
diff --git a/src/oping.h b/src/oping.h
index 5214947..7463672 100644
--- a/src/oping.h
+++ b/src/oping.h
@@ -48,10 +48,12 @@ typedef struct pingobj pingobj_t;
 #define PING_OPT_TIMEOUT 0x01
 #define PING_OPT_TTL     0x02
 #define PING_OPT_AF      0x04
+#define PING_OPT_DATA    0x08
 
 #define PING_DEF_TIMEOUT 1.0
 #define PING_DEF_TTL     255
 #define PING_DEF_AF      AF_UNSPEC
+#define PING_DEF_DATA    "Florian Forster <octo@verplant.org> http://verplant.org/"
 
 /*
  * Method definitions
-- 
2.11.0