This example code prints out the current ruleset in XML format.
In a near future, when sets are XML-handled this example will be updated.
Take this as a proposal. There are many ways to print out the ruleset in XML.
* Nesting or not rules in each chain.
* Nesting or not each chain in his corresponding table.
* Using other naming scheme for top level elements, like '<nftables>' and/or '<ruleset>'.
Also note that ATM there is no implementation to parse the whole ruleset but objects (table/chain/rule).
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
---
examples/Makefile.am | 4 +
examples/nft-ruleset-xml-get.c | 265 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 269 insertions(+)
create mode 100644 examples/nft-ruleset-xml-get.c
diff --git a/examples/Makefile.am b/examples/Makefile.am
index dcf798a..49488b8 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -13,6 +13,7 @@ check_PROGRAMS = nft-table-add \
nft-rule-xml-add \
nft-rule-del \
nft-rule-get \
+ nft-ruleset-xml-get \
nft-events \
nft-set-add \
nft-set-get \
@@ -61,6 +62,9 @@ nft_rule_del_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} ${LIBXML_LIBS}
nft_rule_get_SOURCES = nft-rule-get.c
nft_rule_get_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} ${LIBXML_LIBS}
+nft_ruleset_xml_get_SOURCES = nft-ruleset-xml-get.c
+nft_ruleset_xml_get_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} ${LIBXML_LIBS}
+
nft_events_SOURCES = nft-events.c
nft_events_LDADD = ../src/libnftables.la ${LIBMNL_LIBS} ${LIBXML_LIBS}
diff --git a/examples/nft-ruleset-xml-get.c b/examples/nft-ruleset-xml-get.c
new file mode 100644
index 0000000..b93e55d
--- /dev/null
+++ b/examples/nft-ruleset-xml-get.c
@@ -0,0 +1,265 @@
+/*
+ * (C) 2013 Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#define SNPRINTF_BUFFER_SIZE(ret, size, len, offset) \
+ size += ret; \
+ if (ret > len) \
+ ret = len; \
+ offset += ret; \
+ len -= ret;
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <netinet/in.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftables/table.h>
+#include <libnftables/chain.h>
+#include <libnftables/rule.h>
+#include <libnftables/set.h>
+
+struct printdata {
+ char *buf;
+ int ret;
+ long int size;
+ int len;
+ int offset;
+} ;
+
+static int table_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nft_table *t;
+ struct printdata *p = (struct printdata *)data;
+
+ t = nft_table_alloc();
+ if (t == NULL) {
+ perror("OOM");
+ goto err;
+ }
+
+ if (nft_table_nlmsg_parse(nlh, t) < 0) {
+ perror("nft_table_nlmsg_parse");
+ goto err_free;
+ }
+
+ p->ret = nft_table_snprintf(p->buf+p->offset, p->size, t, NFT_TABLE_O_XML, 0);
+ SNPRINTF_BUFFER_SIZE(p->ret, p->size, p->len, p->offset);
+
+err_free:
+ nft_table_free(t);
+err:
+ return MNL_CB_OK;
+}
+
+static int chain_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nft_chain *c;
+ struct printdata *p = (struct printdata *)data;
+
+ c = nft_chain_alloc();
+ if (c == NULL) {
+ perror("OOM");
+ goto err;
+ }
+
+ if (nft_chain_nlmsg_parse(nlh, c) < 0) {
+ perror("nft_chain_nlmsg_parse");
+ goto err_free;
+ }
+
+ p->ret = nft_chain_snprintf(p->buf+p->offset, p->size, c, NFT_CHAIN_O_XML, 0);
+ SNPRINTF_BUFFER_SIZE(p->ret, p->size, p->len, p->offset);
+
+err_free:
+ nft_chain_free(c);
+err:
+ return MNL_CB_OK;
+}
+
+static int rule_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nft_rule *r;
+ struct printdata *p = (struct printdata *)data;
+
+ r = nft_rule_alloc();
+ if (r == NULL) {
+ perror("OOM");
+ goto err;
+ }
+
+ if (nft_rule_nlmsg_parse(nlh, r) < 0) {
+ perror("nft_rule_nlmsg_parse");
+ goto err_free;
+ }
+
+ p->ret = nft_rule_snprintf(p->buf+p->offset, p->size, r, NFT_RULE_O_XML, 0);
+ SNPRINTF_BUFFER_SIZE(p->ret, p->size, p->len, p->offset);
+
+err_free:
+ nft_rule_free(r);
+err:
+ return MNL_CB_OK;
+}
+
+static void get_table(struct mnl_socket *nl, uint16_t family, struct printdata *p)
+{
+ int ret;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ int seq = time(NULL);
+ struct nlmsghdr *nlh;
+ uint32_t portid = mnl_socket_get_portid(nl);
+
+ nlh = nft_table_nlmsg_build_hdr(buf, NFT_MSG_GETTABLE, family,
+ NLM_F_DUMP, seq);
+
+ 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, table_cb, p);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+}
+
+static void get_chain(struct mnl_socket *nl, uint16_t family, struct printdata *p)
+{
+ int ret;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ int seq = time(NULL);
+ struct nlmsghdr *nlh;
+ uint32_t portid = mnl_socket_get_portid(nl);
+
+ nlh = nft_chain_nlmsg_build_hdr(buf, NFT_MSG_GETCHAIN, family,
+ NLM_F_DUMP, seq);
+
+ 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, chain_cb, p);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+}
+
+static void get_rule(struct mnl_socket *nl, uint16_t family, struct printdata *p)
+{
+ int ret;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ int seq = time(NULL);
+ struct nlmsghdr *nlh;
+ uint32_t portid = mnl_socket_get_portid(nl);
+
+ nlh = nft_chain_nlmsg_build_hdr(buf, NFT_MSG_GETRULE, family,
+ NLM_F_DUMP, seq);
+
+ 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, rule_cb, p);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ struct mnl_socket *nl;
+ char printbuf[1000000];
+ struct printdata p;
+ p.buf = printbuf;
+ p.size = sizeof(printbuf);
+ p.len = p.size;
+ p.offset = 0;
+
+ 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);
+ }
+
+ p.ret = snprintf(p.buf, p.size, "<nftables>");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "<ruleset family=\"AF_BRIDGE\">");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ /*Get Bridge ruleset*/
+ get_table(nl, AF_BRIDGE, &p);
+ get_chain(nl, AF_BRIDGE, &p);
+ get_rule(nl, AF_BRIDGE, &p);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "</ruleset>");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "<ruleset family=\"AF_INET\">");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ /*Get IPv4 ruleset*/
+ get_table(nl, AF_INET, &p);
+ get_chain(nl, AF_INET, &p);
+ get_rule(nl, AF_INET, &p);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "</ruleset>");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "<ruleset family=\"AF_INET6\">");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ /*Get IPv6 ruleset*/
+ get_table(nl, AF_INET6, &p);
+ get_chain(nl, AF_INET6, &p);
+ get_rule(nl, AF_INET6, &p);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "</ruleset>");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ p.ret = snprintf(p.buf+p.offset, p.size, "</nftables>");
+ SNPRINTF_BUFFER_SIZE(p.ret, p.size, p.len, p.offset);
+
+ printf("%s\n", printbuf);
+
+ mnl_socket_close(nl);
+ return EXIT_SUCCESS;
+}
--
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