diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2010-09-08 13:04:35 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2010-09-08 13:07:32 +0200 |
commit | 089d5e1c6a4fcd6615b02866b760f2d7b4084a08 (patch) | |
tree | 607b14e964297f19a84f904fe8f896e142853e70 /examples/rtnl/rtnl-route-add.c | |
parent | 2a67cbdd18d23612a49435e251fb0c853388b0e8 (diff) |
examples: put examples files into specific directories
put examples files into specific directories according to the
Netlink bus they work with. And minor update in the readme file
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'examples/rtnl/rtnl-route-add.c')
-rw-r--r-- | examples/rtnl/rtnl-route-add.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/examples/rtnl/rtnl-route-add.c b/examples/rtnl/rtnl-route-add.c new file mode 100644 index 0000000..1f2d1a0 --- /dev/null +++ b/examples/rtnl/rtnl-route-add.c @@ -0,0 +1,99 @@ +/* + * (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 <netinet/in.h> +#include <arpa/inet.h> +#include <time.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <strings.h> +#include <net/if.h> + +#include <libmnl/libmnl.h> +#include <linux/if_link.h> +#include <linux/rtnetlink.h> + +int main(int argc, char *argv[]) +{ + if (argc <= 3) { + printf("Usage: %s iface destination cidr [gateway]\n", argv[0]); + printf("Example: %s eth0 10.0.1.12 32 10.0.1.11\n", argv[0]); + exit(EXIT_FAILURE); + } + + int iface; + iface = if_nametoindex(argv[1]); + if (iface == 0) { + printf("Bad interface name\n"); + exit(EXIT_FAILURE); + } + + in_addr_t dst; + if (!inet_pton(AF_INET, argv[2], &dst)) { + printf("Bad destination\n"); + exit(EXIT_FAILURE); + } + + uint32_t mask; + if (sscanf(argv[3], "%u", &mask) == 0) { + printf("Bad CIDR\n"); + exit(EXIT_FAILURE); + } + + in_addr_t gw; + if (argc >= 5 && !inet_pton(AF_INET, argv[4], &gw)) { + printf("Bad gateway\n"); + exit(EXIT_FAILURE); + } + + struct mnl_socket *nl; + char buf[getpagesize()]; + struct nlmsghdr *nlh; + struct rtmsg *rtm; + + nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = RTM_NEWROUTE; + nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE; + nlh->nlmsg_seq = time(NULL); + + rtm = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtmsg)); + rtm->rtm_family = AF_INET; + rtm->rtm_dst_len = mask; + rtm->rtm_src_len = 0; + rtm->rtm_tos = 0; + rtm->rtm_protocol = RTPROT_BOOT; + rtm->rtm_table = RT_TABLE_MAIN; + rtm->rtm_type = RTN_UNICAST; + /* is there any gateway? */ + rtm->rtm_scope = (argc == 4) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE; + rtm->rtm_flags = 0; + + mnl_attr_put_u32(nlh, RTA_DST, dst); + mnl_attr_put_u32(nlh, RTA_OIF, iface); + if (argc >= 5) + mnl_attr_put_u32(nlh, RTA_GATEWAY, gw); + + nl = mnl_socket_open(NETLINK_ROUTE); + 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); + } + + if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { + perror("mnl_socket_send"); + exit(EXIT_FAILURE); + } + + mnl_socket_close(nl); + + return 0; +} |