initial libmnl import

1 files changed, 143 insertions, 0 deletions

diff --git a/examples/genl-family-get.c b/examples/genl-family-get.c
new file mode 100644
index 0000000..3e741cb
--- /dev/null
+++ b/examples/genl-family-get.c
@@ -0,0 +1,143 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/genetlink.h>
+
+static void parse_genl_mc_grps(struct nlattr *nested)
+{
+	struct nlattr *pos;
+	int len;
+
+	mnl_attr_for_each_nested(pos, nested, len) {
+		struct nlattr *tb[CTRL_ATTR_MCAST_GRP_MAX+1];
+
+		mnl_attr_parse_nested(pos, tb, CTRL_ATTR_MCAST_GRP_MAX);
+		if (tb[CTRL_ATTR_MCAST_GRP_ID]) {
+			printf("id-0x%x ",
+				mnl_attr_get_u32(tb[CTRL_ATTR_MCAST_GRP_ID]));
+		}
+		if (tb[CTRL_ATTR_MCAST_GRP_NAME]) {
+			printf("name: %s ",
+				mnl_attr_get_str(tb[CTRL_ATTR_MCAST_GRP_NAME]));
+		}
+		printf("\n");
+	}
+}
+
+static void parse_genl_family_ops(struct nlattr *nested)
+{
+	struct nlattr *pos;
+	int len;
+
+	mnl_attr_for_each_nested(pos, nested, len) {
+		struct nlattr *tb[CTRL_ATTR_OP_MAX+1];
+
+		mnl_attr_parse_nested(pos, tb, CTRL_ATTR_OP_MAX);
+		if (tb[CTRL_ATTR_OP_ID]) {
+			printf("id-0x%x ",
+				mnl_attr_get_u32(tb[CTRL_ATTR_OP_ID]));
+		}
+		if (tb[CTRL_ATTR_OP_MAX]) {
+			printf("flags ");
+		}
+		printf("\n");
+	}
+}
+
+static int data_cb(const struct nlmsghdr *nlh, void *data)
+{
+	struct nlattr *tb[CTRL_ATTR_MAX+1];
+	struct genlmsghdr *genl = mnl_nlmsg_get_data(nlh);
+
+	mnl_attr_parse_at_offset(nlh, sizeof(*genl), tb, CTRL_ATTR_MAX);
+	if (tb[CTRL_ATTR_FAMILY_NAME]) {
+		printf("name=%s\t",
+			mnl_attr_get_str(tb[CTRL_ATTR_FAMILY_NAME]));
+	}
+	if (tb[CTRL_ATTR_FAMILY_ID]) {
+		printf("id=%u\t",
+			mnl_attr_get_u16(tb[CTRL_ATTR_FAMILY_ID]));
+	}
+	if (tb[CTRL_ATTR_VERSION]) {
+		printf("version=%u\t",
+			mnl_attr_get_u32(tb[CTRL_ATTR_VERSION]));
+	}
+	if (tb[CTRL_ATTR_HDRSIZE]) {
+		printf("hdrsize=%u\t",
+			mnl_attr_get_u32(tb[CTRL_ATTR_HDRSIZE]));
+	}
+	if (tb[CTRL_ATTR_MAXATTR]) {
+		printf("maxattr=%u\t",
+			mnl_attr_get_u32(tb[CTRL_ATTR_MAXATTR]));
+	}
+	if (tb[CTRL_ATTR_OPS]) {
+		printf("\nops:\n");
+		parse_genl_family_ops(tb[CTRL_ATTR_OPS]);
+	}
+	if (tb[CTRL_ATTR_MCAST_GROUPS]) {
+		printf("\ngrps:\n");
+		parse_genl_mc_grps(tb[CTRL_ATTR_MCAST_GROUPS]);
+	}
+	return MNL_CB_OK;
+}
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char buf[getpagesize()];
+	struct nlmsghdr *nlh;
+	struct genlmsghdr *genl;
+	int ret;
+	unsigned int seq;
+
+	if (argc != 2) {
+		printf("%s [family name]\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	nlh = mnl_nlmsg_put_header(buf);
+	nlh->nlmsg_type	= GENL_ID_CTRL;
+	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	nlh->nlmsg_seq = seq = time(NULL);
+
+	genl = mnl_nlmsg_put_extra_header(nlh, sizeof(struct genlmsghdr));
+	genl->cmd = CTRL_CMD_GETFAMILY;
+	genl->version = 1;
+
+	mnl_attr_put_u32(nlh, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL);
+	mnl_attr_put_str_null(nlh, CTRL_ATTR_FAMILY_NAME, argv[1]);
+
+	nl = mnl_socket_open(NETLINK_GENERIC);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_sendto(nl, nlh, mnl_nlmsg_get_len(nlh)) < 0) {
+		perror("mnl_socket_send");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, seq, data_cb, NULL);
+		if (ret <= 0)
+			break;
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	if (ret == -1) {
+		perror("error");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_socket_close(nl);
+
+	return 0;
+}