diff options
Diffstat (limited to 'examples/genl/genl-family-get.c')
| -rw-r--r-- | examples/genl/genl-family-get.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/examples/genl/genl-family-get.c b/examples/genl/genl-family-get.c new file mode 100644 index 0000000..326755e --- /dev/null +++ b/examples/genl/genl-family-get.c @@ -0,0 +1,241 @@ +/* + * (C) 2009-2010 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * This software may be used and distributed according to the terms + * of the GNU General Public License, incorporated herein by reference. + */ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <time.h> + +#include <libmnl/libmnl.h> +#include <linux/genetlink.h> + +static int parse_mc_grps_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = (const struct nlattr **)data; + int type = mnl_attr_get_type(attr); + + /* skip unsupported attribute in user-space */ + if (mnl_attr_type_valid(attr, CTRL_ATTR_MCAST_GRP_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case CTRL_ATTR_MCAST_GRP_ID: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTRL_ATTR_MCAST_GRP_NAME: + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + } + tb[type] = attr; + return MNL_CB_OK; +} + +static void parse_genl_mc_grps(struct nlattr *nested) +{ + struct nlattr *pos; + + mnl_attr_for_each_nested(pos, nested) { + struct nlattr *tb[CTRL_ATTR_MCAST_GRP_MAX+1] = {}; + + mnl_attr_parse_nested(pos, parse_mc_grps_cb, tb); + 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 int parse_family_ops_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = (const struct nlattr **)data; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, CTRL_ATTR_OP_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case CTRL_ATTR_OP_ID: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTRL_ATTR_OP_MAX: + break; + default: + return MNL_CB_OK; + } + tb[type] = attr; + return MNL_CB_OK; +} + +static void parse_genl_family_ops(struct nlattr *nested) +{ + struct nlattr *pos; + + mnl_attr_for_each_nested(pos, nested) { + struct nlattr *tb[CTRL_ATTR_OP_MAX+1] = {}; + + mnl_attr_parse_nested(pos, parse_family_ops_cb, tb); + 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_attr_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = (const struct nlattr **)data; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, CTRL_ATTR_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case CTRL_ATTR_FAMILY_NAME: + if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTRL_ATTR_FAMILY_ID: + if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTRL_ATTR_VERSION: + case CTRL_ATTR_HDRSIZE: + case CTRL_ATTR_MAXATTR: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + case CTRL_ATTR_OPS: + case CTRL_ATTR_MCAST_GROUPS: + if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + break; + } + tb[type] = attr; + return MNL_CB_OK; +} + +static int data_cb(const struct nlmsghdr *nlh, void *data) +{ + struct nlattr *tb[CTRL_ATTR_MAX+1] = {}; + struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh); + + mnl_attr_parse(nlh, sizeof(*genl), data_attr_cb, tb); + 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, portid; + + 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); + } + portid = mnl_socket_get_portid(nl); + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 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, portid, 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; +} |