From c67acf4ccc381985f5da5881e976b749651f07b1 Mon Sep 17 00:00:00 2001
From: Daniel Collins <daniel.collins@smoothwall.net>
Date: Thu, 9 Jan 2014 11:38:54 +0000
Subject: [PATCH] liboping: Add support for SO_MARK.

Marks packets, which can be used for filtering and routing in Linux.
---
 src/liboping.c           | 33 +++++++++++++++++++++++++++++++++
 src/mans/ping_setopt.pod |  6 ++++++
 src/oping.h              |  1 +
 3 files changed, 40 insertions(+)

diff --git a/src/liboping.c b/src/liboping.c
index 40a0ba2..dd9da46 100644
--- a/src/liboping.c
+++ b/src/liboping.c
@@ -142,6 +142,9 @@ struct pingobj
 
 	char                    *device;
 
+	char                    set_mark;
+	int                     mark;
+
 	char                     errmsg[PING_ERRMSG_LEN];
 
 	pinghost_t              *head;
@@ -1322,6 +1325,19 @@ int ping_setopt (pingobj_t *obj, int option, void *value)
 		} /* case PING_OPT_DEVICE */
 		break;
 
+		case PING_OPT_MARK:
+		{
+#ifdef SO_MARK
+			obj->mark     = *(int*)(value);
+			obj->set_mark = 1;
+#else /* SO_MARK */
+			ping_set_errno (obj, ENOTSUP);
+			ret = -1;
+#endif /* !SO_MARK */
+			
+		} /* case PING_OPT_MARK */
+		break;
+
 		default:
 			ret = -2;
 	} /* switch (option) */
@@ -1508,6 +1524,23 @@ int ping_host_add (pingobj_t *obj, const char *host)
 			}
 		}
 #endif /* SO_BINDTODEVICE */
+#ifdef SO_MARK
+		if(obj->set_mark)
+		{
+			if(setsockopt(ph->fd, SOL_SOCKET, SO_MARK, &(obj->mark), sizeof(obj->mark)) != 0)
+			{
+#if WITH_DEBUG
+				char errbuf[PING_ERRMSG_LEN];
+				dprintf ("setsockopt (SO_MARK): %s\n",
+						sstrerror (errno, errbuf, sizeof (errbuf)));
+#endif
+				ping_set_errno (obj, errno);
+				close (ph->fd);
+				ph->fd = -1;
+				continue;
+			}
+		}
+#endif
 #ifdef SO_TIMESTAMP
 		if (1) /* {{{ */
 		{
diff --git a/src/mans/ping_setopt.pod b/src/mans/ping_setopt.pod
index 11c63d8..ba7e44f 100644
--- a/src/mans/ping_setopt.pod
+++ b/src/mans/ping_setopt.pod
@@ -75,6 +75,12 @@ C<IP_TOS> (IPv4) or C<IPV6_TCLASS> (IPv6) option. It is the caller's
 responsibility to chose a valid bit combination. For details, read the L<ip(7)>
 and L<ipv6(7)> manual pages, as well as I<RFCE<nbsp>2474>.
 
+=item B<PING_OPT_MARK>
+
+Mark (as in netfilter) outgoing packets using the SO_MARK socket option. Takes
+an int* pointer as a value. Setting this requires CAP_NET_ADMIN under Linux.
+Fails with C<operation not supported> on platforms which don't have SO_MARK.
+
 =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 9f8d5e1..e5bc5fa 100644
--- a/src/oping.h
+++ b/src/oping.h
@@ -53,6 +53,7 @@ typedef struct pingobj pingobj_t;
 #define PING_OPT_SOURCE  0x10
 #define PING_OPT_DEVICE  0x20
 #define PING_OPT_QOS     0x40
+#define PING_OPT_MARK    0x80
 
 #define PING_DEF_TIMEOUT 1.0
 #define PING_DEF_TTL     255
-- 
2.30.2