From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ken-ichirou MATSUZAWA Subject: [lnf-log RFC PATCH 2/2] utils: take a example from libmnl and use nflog_nlmsg_parse Date: Mon, 10 Aug 2015 17:17:53 +0900 Message-ID: <20150810081752.GD25169@gmail.com> References: <20150810081342.GB25169@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: The netfilter developer mailinglist Return-path: Received: from mail-pa0-f47.google.com ([209.85.220.47]:34607 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932386AbbHJIR6 (ORCPT ); Mon, 10 Aug 2015 04:17:58 -0400 Received: by pawu10 with SMTP id u10so135283812paw.1 for ; Mon, 10 Aug 2015 01:17:57 -0700 (PDT) Received: from gmail.com (softbank220009032004.bbtec.net. [220.9.32.4]) by smtp.gmail.com with ESMTPSA id cr4sm18990191pac.10.2015.08.10.01.17.56 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 10 Aug 2015 01:17:57 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20150810081342.GB25169@gmail.com> Sender: netfilter-devel-owner@vger.kernel.org List-ID: Signed-off-by: Ken-ichirou MATSUZAWA --- utils/Makefile.am | 6 +- utils/nf-log.c | 178 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 183 insertions(+), 1 deletion(-) create mode 100644 utils/nf-log.c 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..ab9ac70 --- /dev/null +++ b/utils/nf-log.c @@ -0,0 +1,178 @@ +/* This example is placed in the public domain. */ +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include + +static int log_cb(const struct nlmsghdr *nlh, void *data) +{ + struct nflog_data *nfad; + struct nfulnl_msg_packet_hdr *ph = NULL; + const char *prefix = NULL; + uint32_t mark = 0; + int ret; + + nfad = nflog_data_alloc(); + if (nfad == NULL) + return MNL_CB_ERROR; + ret = nflog_nlmsg_parse(nlh, nfad); + if (ret != MNL_CB_OK) + return ret; + + ph = nflog_get_msg_packet_hdr(nfad); + prefix = nflog_get_prefix(nfad); + mark = nflog_get_nfmark(nfad); + + 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; +} + +static struct nlmsghdr * +nflog_build_cfg_pf_request(char *buf, uint8_t command) +{ + struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_CONFIG; + nlh->nlmsg_flags = NLM_F_REQUEST; + + struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg)); + nfg->nfgen_family = AF_INET; + nfg->version = NFNETLINK_V0; + + struct nfulnl_msg_config_cmd cmd = { + .command = command, + }; + mnl_attr_put(nlh, NFULA_CFG_CMD, sizeof(cmd), &cmd); + + return nlh; +} + +static struct nlmsghdr * +nflog_build_cfg_request(char *buf, uint8_t command, int qnum) +{ + struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_CONFIG; + nlh->nlmsg_flags = NLM_F_REQUEST; + + struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg)); + nfg->nfgen_family = AF_INET; + nfg->version = NFNETLINK_V0; + nfg->res_id = htons(qnum); + + struct nfulnl_msg_config_cmd cmd = { + .command = command, + }; + mnl_attr_put(nlh, NFULA_CFG_CMD, sizeof(cmd), &cmd); + + return nlh; +} + +static struct nlmsghdr * +nflog_build_cfg_params(char *buf, uint8_t mode, int range, int qnum) +{ + struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_CONFIG; + nlh->nlmsg_flags = NLM_F_REQUEST; + + struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg)); + nfg->nfgen_family = AF_UNSPEC; + nfg->version = NFNETLINK_V0; + nfg->res_id = htons(qnum); + + struct nfulnl_msg_config_mode params = { + .copy_range = htonl(range), + .copy_mode = mode, + }; + mnl_attr_put(nlh, NFULA_CFG_MODE, sizeof(params), ¶ms); + + return nlh; +} + +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); + + nlh = nflog_build_cfg_pf_request(buf, NFULNL_CFG_CMD_PF_UNBIND); + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + nlh = nflog_build_cfg_pf_request(buf, NFULNL_CFG_CMD_PF_BIND); + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + nlh = nflog_build_cfg_request(buf, NFULNL_CFG_CMD_BIND, qnum); + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_sendto"); + exit(EXIT_FAILURE); + } + + nlh = nflog_build_cfg_params(buf, NFULNL_COPY_PACKET, 0xFFFF, qnum); + + 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; +} -- 2.1.4