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| author | Ken-ichirou MATSUZAWA <chamaken@gmail.com> | 2014-09-25 09:33:27 +0900 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-09-25 12:46:13 +0200 |
| commit | e374664f48724e5b13a848bad5c5353349f0ae38 (patch) | |
| tree | 3817b5e34fafa9e9ef38ca7edbe67df5ce21bea8 | |
| parent | 2c458b2eb479cbc83c83de79dcd14bec6acc90bd (diff) | |
| download | libmnl-e374664f48724e5b13a848bad5c5353349f0ae38.tar.gz libmnl-e374664f48724e5b13a848bad5c5353349f0ae38.zip | |
socket: creating a struct mnl_socket from a pre-existing socket
This patch defines a new function mnl_socket_fdopen() which creates a
struct mnl_socket object from a pre-existing socket like obtained from
other process and different domain/type from the same prodess.
Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | include/libmnl/libmnl.h | 1 | ||||
| -rw-r--r-- | src/libmnl.map | 4 | ||||
| -rw-r--r-- | src/socket.c | 34 |
3 files changed, 39 insertions, 0 deletions
diff --git a/include/libmnl/libmnl.h b/include/libmnl/libmnl.h index 223709c..0de6678 100644 --- a/include/libmnl/libmnl.h +++ b/include/libmnl/libmnl.h @@ -22,6 +22,7 @@ extern "C" { struct mnl_socket; extern struct mnl_socket *mnl_socket_open(int type); +extern struct mnl_socket *mnl_socket_fdopen(int fd); extern int mnl_socket_bind(struct mnl_socket *nl, unsigned int groups, pid_t pid); extern int mnl_socket_close(struct mnl_socket *nl); extern int mnl_socket_get_fd(const struct mnl_socket *nl); diff --git a/src/libmnl.map b/src/libmnl.map index dbc332e..3c147a7 100644 --- a/src/libmnl.map +++ b/src/libmnl.map @@ -72,3 +72,7 @@ local: *; LIBMNL_1.1 { mnl_attr_parse_payload; } LIBMNL_1.0; + +LIBMNL_1.2 { + mnl_socket_fdopen; +} LIBMNL_1.1; diff --git a/src/socket.c b/src/socket.c index 0c3cd72..86657d4 100644 --- a/src/socket.c +++ b/src/socket.c @@ -129,6 +129,40 @@ struct mnl_socket *mnl_socket_open(int bus) EXPORT_SYMBOL(mnl_socket_open); /** + * mnl_socket_fdopen - associates a mnl_socket object with pre-existing socket. + * \param fd pre-existing socket descriptor. + * + * On error, it returns NULL and errno is appropriately set. Otherwise, it + * returns a valid pointer to the mnl_socket structure. It also sets the portID + * if the socket fd is already bound and it is AF_NETLINK. + * + * Note that mnl_socket_get_portid() returns 0 if this function is used with + * non-netlink socket. + */ +struct mnl_socket *mnl_socket_fdopen(int fd) +{ + int ret; + struct mnl_socket *nl; + struct sockaddr_nl addr; + socklen_t addr_len = sizeof(struct sockaddr_nl); + + ret = getsockname(fd, (struct sockaddr *) &addr, &addr_len); + if (ret == -1) + return NULL; + + nl = calloc(1, sizeof(struct mnl_socket)); + if (nl == NULL) + return NULL; + + nl->fd = fd; + if (addr.nl_family == AF_NETLINK) + nl->addr = addr; + + return nl; +} +EXPORT_SYMBOL(mnl_socket_fdopen); + +/** * mnl_socket_bind - bind netlink socket * \param nl netlink socket obtained via mnl_socket_open() * \param groups the group of message you're interested in |