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author | Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> | 2013-05-22 00:33:25 +0000 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-05-23 12:34:13 +0200 |
commit | 4d6045630bb90182abf553df1b7f2764a24620b0 (patch) | |
tree | 38f1f95d7f8adc073ded4aefb98a29bf7fcec164 /examples/nft-table-xml-add.c | |
parent | 51370f0eedb1c8167ab2c340d2a53f0d9f02509c (diff) |
examples: XML parsing examples
Some code snipplets to add tables/chain/rules using the XML representation.
The examples contains:
* A binary to parse/add the object using libnftables.
* A shellscript to easily call that binary, doing some tests.
* table/chain/rule sample XML file.
I included my name in new files, but I don't know if this is correct. Please let me know.
Instructions:
$ cd examples/ ; make nft-table-xml-add
# cd test/ ; ./nft-table-xml-add.sh
NOTE: Some kernel changes are required to allow reinsert exactly what is printed (handle handling, flags..)
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'examples/nft-table-xml-add.c')
-rw-r--r-- | examples/nft-table-xml-add.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/examples/nft-table-xml-add.c b/examples/nft-table-xml-add.c new file mode 100644 index 0000000..41df5b4 --- /dev/null +++ b/examples/nft-table-xml-add.c @@ -0,0 +1,117 @@ +/* + * 2013 by Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> + * + * 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. + */ + +#include <stdlib.h> +#include <time.h> +#include <string.h> +#include <netinet/in.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> + +#include <linux/netfilter/nf_tables.h> + +#include <libmnl/libmnl.h> +#include <libnftables/table.h> + +extern struct nft_table nft_table; + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + uint32_t portid, seq; + struct nft_table *t = NULL; + int ret; + int fd; + uint16_t family; + char xml[4096]; + char reprint[4096]; + + if (argc < 2) { + printf("Usage: %s <xml-file>\n", argv[0]); + exit(EXIT_FAILURE); + } + + fd = open(argv[1], O_RDONLY); + if (fd < 0) { + perror("open"); + exit(EXIT_FAILURE); + } + + if (read(fd, xml, sizeof(xml)) < 0) { + perror("read"); + close(fd); + exit(EXIT_FAILURE); + } + + t = nft_table_alloc(); + if (t == NULL) { + perror("OOM"); + close(fd); + exit(EXIT_FAILURE); + } + + /* Parsing XML now */ + if (nft_table_parse(t, NFT_TABLE_PARSE_XML, xml) < 0) { + printf("E: Unable to parse XML file: %s\n", strerror(errno)); + close(fd); + exit(EXIT_FAILURE); + } + + close(fd); + + nft_table_snprintf(reprint, sizeof(reprint), t, NFT_TABLE_O_XML, 0); + printf("Parsed:\n%s\n", reprint); + + + family = (uint16_t)nft_table_attr_get_u32(t, NFT_TABLE_ATTR_FAMILY); + + seq = time(NULL); + + nlh = nft_table_nlmsg_build_hdr(buf, NFT_MSG_NEWTABLE, family, + NLM_F_ACK, seq); + nft_table_nlmsg_build_payload(nlh, t); + nft_table_free(t); + + 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); + + 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, NULL, 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 EXIT_SUCCESS; +} |