[PATCH v2 2/3] rtnl_addr: decode ifaddrmsg netlink attributes
JingPiao Chen
chenjingpiao at gmail.com
Tue Aug 22 06:45:48 UTC 2017
* address.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (decode_inet_address, decode_proto_address): New prototypes.
* rtnl_addr.c (decode_ifa_address,
decode_ifa_cacheinfo, decode_ifa_flags): New functions.
(ifaddrmsg_nla_decoders): New array.
(decode_ifaddrmsg): Use it.
---
Makefile.am | 1 +
address.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
defs.h | 6 +++++
rtnl_addr.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 153 insertions(+), 1 deletion(-)
create mode 100644 address.c
diff --git a/Makefile.am b/Makefile.am
index 2a477f6..32d17b0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -83,6 +83,7 @@ libstrace_a_SOURCES = \
strace_SOURCES = \
access.c \
+ address.c \
affinity.c \
aio.c \
alpha.c \
diff --git a/address.c b/address.c
new file mode 100644
index 0000000..44b26f5
--- /dev/null
+++ b/address.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao at gmail.com>
+ * Copyright (c) 2017 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "defs.h"
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+bool
+decode_inet_address(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const int family)
+{
+ union {
+ struct in_addr a4;
+ struct in6_addr a6;
+ } buf;
+ char str[INET6_ADDRSTRLEN];
+ size_t size = 0;
+
+ switch (family) {
+ case AF_INET:
+ size = sizeof(buf.a4);
+ break;
+ case AF_INET6:
+ size = sizeof(buf.a6);
+ break;
+ }
+
+ if (!size || len < size)
+ goto end;
+ if (umoven_or_printaddr(tcp, addr, size, &buf) < 0)
+ return false;
+ if (inet_ntop(family, &buf, str, sizeof(str))) {
+ tprints(str);
+ return true;
+ }
+end:
+ printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
+ return false;
+}
+
+bool
+decode_proto_address(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const int family)
+{
+ switch (family) {
+ case AF_INET:
+ case AF_INET6:
+ return decode_inet_address(tcp, addr, len, family);
+ }
+
+ printstr_ex(tcp, addr, len, QUOTE_FORCE_HEX);
+ return false;
+}
diff --git a/defs.h b/defs.h
index e6659a5..a3931b2 100644
--- a/defs.h
+++ b/defs.h
@@ -610,6 +610,12 @@ extern void printfd(struct tcb *, int);
extern void print_sockaddr(const void *sa, int len);
extern bool
print_inet_addr(int af, const void *addr, unsigned int len, const char *var_name);
+extern bool
+decode_inet_address(struct tcb *, const kernel_ulong_t addr,
+ const unsigned int len, const int family);
+extern bool
+decode_proto_address(struct tcb *, const kernel_ulong_t addr,
+ const unsigned int len, const int family);
extern const char *get_sockaddr_by_inode(struct tcb *, int fd, unsigned long inode);
extern bool print_sockaddr_by_inode(struct tcb *, int fd, unsigned long inode);
extern void print_dirfd(struct tcb *, int);
diff --git a/rtnl_addr.c b/rtnl_addr.c
index c7e37ea..9c43085 100644
--- a/rtnl_addr.c
+++ b/rtnl_addr.c
@@ -42,6 +42,67 @@
#include "xlat/routing_scopes.h"
#include "xlat/rtnl_addr_attrs.h"
+static bool
+decode_ifa_address(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ const struct ifaddrmsg *const ifaddr = opaque_data;
+
+ decode_proto_address(tcp, addr, len, ifaddr->ifa_family);
+
+ return true;
+}
+
+static bool
+decode_ifa_cacheinfo(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ struct ifa_cacheinfo ci;
+
+ if (len < sizeof(ci))
+ return false;
+ else if (!umove_or_printaddr(tcp, addr, &ci)) {
+ PRINT_FIELD_U("{", ci, ifa_prefered);
+ PRINT_FIELD_U(", ", ci, ifa_valid);
+ PRINT_FIELD_U(", ", ci, cstamp);
+ PRINT_FIELD_U(", ", ci, tstamp);
+ tprintf("}");
+ }
+
+ return true;
+}
+
+static bool
+decode_ifa_flags(struct tcb *const tcp,
+ const kernel_ulong_t addr,
+ const unsigned int len,
+ const void *const opaque_data)
+{
+ uint32_t ifa_flags;
+
+ if (len < sizeof(ifa_flags))
+ return false;
+ else if (!umove_or_printaddr(tcp, addr, &ifa_flags))
+ printflags(ifaddrflags, ifa_flags, "IFA_F_???");
+
+ return true;
+}
+
+static const nla_decoder_t ifaddrmsg_nla_decoders[] = {
+ [IFA_ADDRESS] = decode_ifa_address,
+ [IFA_LOCAL] = decode_ifa_address,
+ [IFA_LABEL] = decode_nla_str,
+ [IFA_BROADCAST] = decode_ifa_address,
+ [IFA_ANYCAST] = decode_ifa_address,
+ [IFA_CACHEINFO] = decode_ifa_cacheinfo,
+ [IFA_MULTICAST] = decode_ifa_address,
+ [IFA_FLAGS] = decode_ifa_flags
+};
+
DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)
{
struct ifaddrmsg ifaddr = { .ifa_family = family };
@@ -71,6 +132,8 @@ DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg)
if (decode_nla && len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
- rtnl_addr_attrs, "IFA_???", NULL, 0, NULL);
+ rtnl_addr_attrs, "IFA_???",
+ ifaddrmsg_nla_decoders,
+ ARRAY_SIZE(ifaddrmsg_nla_decoders), &ifaddr);
}
}
--
2.7.4
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