Now I'm working on decoding the communication on Netlink GENERIC
protocol. For the task, many lines of receive_responses can be reused
with two minor modifications. This is the second one.
* socketutils.c (receive_responses): change the data type
of parameter `proto_name' to `void *' from `const char *'
to allow callee passing arbitrary data to the call backward
function `parser'. In addition the parameter name is
changed to `user_data'. To follow common convention, the
parameter is passed to `parser' as its last argument.
(unix_get, inet_get, netlink_get): Cast statically given
the protocol name to `void *' to pass it to the call
back function.
(inet_parse_response,unix_parse_response,netlink_parse_response):
Introduce a local variable `proto_name' to convert the data type
of argument from `void *' to `const char*'.
Signed-off-by: Masatake YAMATO <yam...@redhat.com>
---
socketutils.c | 33 +++++++++++++++++++--------------
1 file changed, 19 insertions(+), 14 deletions(-)
diff --git a/socketutils.c b/socketutils.c
index 3292c2e..0016942 100644
--- a/socketutils.c
+++ b/socketutils.c
@@ -134,9 +134,10 @@ inet_send_query(const int fd, const int family, const int
proto)
}
static int
-inet_parse_response(const char *const proto_name, const void *const data,
- const int data_len, const unsigned long inode)
+inet_parse_response(const void *const data,
+ const int data_len, const unsigned long inode, void
*user_data)
{
+ const char *const proto_name = user_data;
const struct inet_diag_msg *const diag_msg = data;
static const char zero_addr[sizeof(struct in6_addr)];
socklen_t addr_size, text_size;
@@ -190,9 +191,9 @@ inet_parse_response(const char *const proto_name, const
void *const data,
static bool
receive_responses(const int fd, const unsigned long inode,
unsigned long expected_msg_type,
- const char *proto_name,
- int (* parser) (const char *, const void *,
- int, unsigned long))
+ void *user_data,
+ int (* parser) (const void *,
+ int, unsigned long, void *))
{
static union {
struct nlmsghdr hdr;
@@ -229,8 +230,8 @@ receive_responses(const int fd, const unsigned long inode,
for (; NLMSG_OK(h, ret); h = NLMSG_NEXT(h, ret)) {
if (h->nlmsg_type != expected_msg_type)
return false;
- const int rc = parser(proto_name, NLMSG_DATA(h),
- h->nlmsg_len, inode);
+ const int rc = parser(NLMSG_DATA(h),
+ h->nlmsg_len, inode, user_data);
if (rc > 0)
return true;
if (rc < 0)
@@ -263,9 +264,11 @@ unix_send_query(const int fd, const unsigned long inode)
}
static int
-unix_parse_response(const char *proto_name, const void *data,
- const int data_len, const unsigned long inode)
+unix_parse_response(const void *data,
+ const int data_len, const unsigned long inode,
+ void *user_data)
{
+ const char *proto_name = user_data;
const struct unix_diag_msg *diag_msg = data;
struct rtattr *attr;
int rta_len = data_len - NLMSG_LENGTH(sizeof(*diag_msg));
@@ -361,9 +364,11 @@ netlink_send_query(const int fd, const unsigned long inode)
}
static int
-netlink_parse_response(const char *proto_name, const void *data,
- const int data_len, const unsigned long inode)
+netlink_parse_response(const void *data,
+ const int data_len, const unsigned long inode,
+ void *user_data)
{
+ const char *proto_name = user_data;
const struct netlink_diag_msg *const diag_msg = data;
const char *netlink_proto;
char *details;
@@ -397,7 +402,7 @@ static const char *
unix_get(const int fd, const unsigned long inode)
{
return unix_send_query(fd, inode)
- && receive_responses(fd, inode, SOCK_DIAG_BY_FAMILY, "UNIX",
unix_parse_response)
+ && receive_responses(fd, inode, SOCK_DIAG_BY_FAMILY, (void
*)"UNIX", unix_parse_response)
? get_sockaddr_by_inode_cached(inode) : NULL;
}
@@ -406,7 +411,7 @@ inet_get(const int fd, const int family, const int protocol,
const unsigned long inode, const char *proto_name)
{
return inet_send_query(fd, family, protocol)
- && receive_responses(fd, inode, SOCK_DIAG_BY_FAMILY,
proto_name, inet_parse_response)
+ && receive_responses(fd, inode, SOCK_DIAG_BY_FAMILY, (void
*)proto_name, inet_parse_response)
? get_sockaddr_by_inode_cached(inode) : NULL;
}
@@ -438,7 +443,7 @@ static const char *
netlink_get(const int fd, const unsigned long inode)
{
return netlink_send_query(fd, inode)
- && receive_responses(fd, inode, SOCK_DIAG_BY_FAMILY, "NETLINK",
+ && receive_responses(fd, inode, SOCK_DIAG_BY_FAMILY, (void
*)"NETLINK",
netlink_parse_response)
? get_sockaddr_by_inode_cached(inode) : NULL;
}
--
2.9.4
------------------------------------------------------------------------------
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