From 7ceefe50a1690d9b6d0125c9b9f53c959ae7a128 Mon Sep 17 00:00:00 2001 From: Ken-ichirou MATSUZAWA Date: Fri, 21 Aug 2015 09:27:40 +0900 Subject: utils: take a example from libmnl and use new functions Signed-off-by: Ken-ichirou MATSUZAWA --- utils/.gitignore | 1 + utils/Makefile.am | 6 ++- utils/nf-log.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 137 insertions(+), 1 deletion(-) create mode 100644 utils/nf-log.c diff --git a/utils/.gitignore b/utils/.gitignore index 64e4588..01fa66d 100644 --- a/utils/.gitignore +++ b/utils/.gitignore @@ -1,2 +1,3 @@ /nfulnl_test /ulog_test +/nf-log diff --git a/utils/Makefile.am b/utils/Makefile.am index f961b6c..dfe5f34 100644 --- a/utils/Makefile.am +++ b/utils/Makefile.am @@ -1,11 +1,15 @@ include ${top_srcdir}/Make_global.am -check_PROGRAMS = nfulnl_test +check_PROGRAMS = nfulnl_test nf-log nfulnl_test_SOURCES = nfulnl_test.c nfulnl_test_LDADD = ../src/libnetfilter_log.la nfulnl_test_LDFLAGS = -dynamic +nf_log_SOURCES = nf-log.c +nf_log_LDADD = ../src/libnetfilter_log.la +nf_log_LDFLAGS = -dynamic -lmnl + if BUILD_IPULOG check_PROGRAMS += ulog_test diff --git a/utils/nf-log.c b/utils/nf-log.c new file mode 100644 index 0000000..d575b77 --- /dev/null +++ b/utils/nf-log.c @@ -0,0 +1,131 @@ +/* This example is placed in the public domain. */ +#include +#include +#include + +#include + +#include +#include + +static int log_cb(const struct nlmsghdr *nlh, void *data) +{ + struct nlattr *attrs[NFULA_MAX + 1] = { NULL }; + struct nfulnl_msg_packet_hdr *ph = NULL; + const char *prefix = NULL; + uint32_t mark = 0; + int ret; + + ret = nflog_nlmsg_parse(nlh, attrs); + if (ret != MNL_CB_OK) + return ret; + + if (attrs[NFULA_PACKET_HDR]) + ph = mnl_attr_get_payload(attrs[NFULA_PACKET_HDR]); + if (attrs[NFULA_PREFIX]) + prefix = mnl_attr_get_str(attrs[NFULA_PREFIX]); + if (attrs[NFULA_MARK]) + mark = ntohl(mnl_attr_get_u32(attrs[NFULA_MARK])); + + printf("log received (prefix=\"%s\" hw=0x%04x hook=%u mark=%u)\n", + prefix ? prefix : "", ntohs(ph->hw_protocol), ph->hook, + mark); + + return MNL_CB_OK; +} + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + int ret; + unsigned int portid, qnum; + + if (argc != 2) { + printf("Usage: %s [queue_num]\n", argv[0]); + exit(EXIT_FAILURE); + } + qnum = atoi(argv[1]); + + nl = mnl_socket_open(NETLINK_NETFILTER); + 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); + + /* kernels 3.8 and later is required to omit PF_(UN)BIND */ + + nlh = nflog_nlmsg_put_header(buf, NFULNL_MSG_CONFIG, AF_INET, 0); + if (nflog_attr_put_cfg_cmd(nlh, NFULNL_CFG_CMD_PF_UNBIND) < 0) { + perror("nflog_attr_put_cfg_cmd"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + nlh = nflog_nlmsg_put_header(buf, NFULNL_MSG_CONFIG, AF_INET, 0); + if (nflog_attr_put_cfg_cmd(nlh, NFULNL_CFG_CMD_PF_BIND) < 0) { + perror("nflog_attr_put_cfg_cmd"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + nlh = nflog_nlmsg_put_header(buf, NFULNL_MSG_CONFIG, AF_INET, qnum); + if (nflog_attr_put_cfg_cmd(nlh, NFULNL_CFG_CMD_BIND) < 0) { + perror("nflog_attr_put_cfg_cmd"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + nlh = nflog_nlmsg_put_header(buf, NFULNL_MSG_CONFIG, AF_UNSPEC, qnum); + if (nflog_attr_put_cfg_mode(nlh, NFULNL_COPY_PACKET, 0xffff) < 0) { + perror("nflog_attr_put_cfg_mode"); + exit(EXIT_FAILURE); + } + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + if (ret == -1) { + perror("mnl_socket_recvfrom"); + exit(EXIT_FAILURE); + } + while (ret > 0) { + ret = mnl_cb_run(buf, ret, 0, portid, log_cb, NULL); + if (ret < 0){ + perror("mnl_cb_run"); + exit(EXIT_FAILURE); + } + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + if (ret == -1) { + perror("mnl_socket_recvfrom"); + exit(EXIT_FAILURE); + } + } + + mnl_socket_close(nl); + + return 0; +} -- cgit v1.2.3