From 5937dfcb0185f5cb9cf275992ea701ec4e619d9c Mon Sep 17 00:00:00 2001 From: Petr Vorel Date: Sun, 5 May 2019 23:01:30 +0200 Subject: examples: Add rtnl-addr-add.c Signed-off-by: Petr Vorel Signed-off-by: Pablo Neira Ayuso --- examples/rtnl/.gitignore | 1 + examples/rtnl/Makefile.am | 6 ++- examples/rtnl/rtnl-addr-add.c | 119 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 125 insertions(+), 1 deletion(-) create mode 100644 examples/rtnl/rtnl-addr-add.c (limited to 'examples') diff --git a/examples/rtnl/.gitignore b/examples/rtnl/.gitignore index b03a27d..24ac633 100644 --- a/examples/rtnl/.gitignore +++ b/examples/rtnl/.gitignore @@ -1,3 +1,4 @@ +/rtnl-addr-add /rtnl-link-dump /rtnl-link-dump2 /rtnl-link-dump3 diff --git a/examples/rtnl/Makefile.am b/examples/rtnl/Makefile.am index 174a4fb..dd8a77d 100644 --- a/examples/rtnl/Makefile.am +++ b/examples/rtnl/Makefile.am @@ -1,6 +1,7 @@ include $(top_srcdir)/Make_global.am -check_PROGRAMS = rtnl-addr-dump \ +check_PROGRAMS = rtnl-addr-add \ + rtnl-addr-dump \ rtnl-link-dump rtnl-link-dump2 rtnl-link-dump3 \ rtnl-link-event \ rtnl-link-set \ @@ -9,6 +10,9 @@ check_PROGRAMS = rtnl-addr-dump \ rtnl-route-event \ rtnl-neigh-dump +rtnl_addr_add_SOURCES = rtnl-addr-add.c +rtnl_addr_add_LDADD = ../../src/libmnl.la + rtnl_addr_dump_SOURCES = rtnl-addr-dump.c rtnl_addr_dump_LDADD = ../../src/libmnl.la diff --git a/examples/rtnl/rtnl-addr-add.c b/examples/rtnl/rtnl-addr-add.c new file mode 100644 index 0000000..f9a69dc --- /dev/null +++ b/examples/rtnl/rtnl-addr-add.c @@ -0,0 +1,119 @@ +/* This example is placed in the public domain. */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +int main(int argc, char *argv[]) +{ + struct mnl_socket *nl; + char buf[MNL_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + struct ifaddrmsg *ifm; + uint32_t seq, portid; + union { + in_addr_t ip; + struct in6_addr ip6; + } addr; + int ret, family = AF_INET; + + uint32_t prefix; + int iface; + + + if (argc <= 3) { + printf("Usage: %s iface destination cidr\n", argv[0]); + printf("Example: %s eth0 10.0.1.12 32\n", argv[0]); + printf(" %s eth0 ffff::10.0.1.12 128\n", argv[0]); + exit(EXIT_FAILURE); + } + + iface = if_nametoindex(argv[1]); + if (iface == 0) { + perror("if_nametoindex"); + exit(EXIT_FAILURE); + } + + if (!inet_pton(AF_INET, argv[2], &addr)) { + if (!inet_pton(AF_INET6, argv[2], &addr)) { + perror("inet_pton"); + exit(EXIT_FAILURE); + } + family = AF_INET6; + } + + if (sscanf(argv[3], "%u", &prefix) == 0) { + perror("sscanf"); + exit(EXIT_FAILURE); + } + + nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = RTM_NEWADDR; + + nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_ACK; + nlh->nlmsg_seq = seq = time(NULL); + + ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(struct ifaddrmsg)); + + ifm->ifa_family = family; + ifm->ifa_prefixlen = prefix; + ifm->ifa_flags = IFA_F_PERMANENT; + + ifm->ifa_scope = RT_SCOPE_UNIVERSE; + ifm->ifa_index = iface; + + /* + * The exact meaning of IFA_LOCAL and IFA_ADDRESS depend + * on the address family being used and the device type. + * For broadcast devices (like the interfaces we use), + * for IPv4 we specify both and they are used interchangeably. + * For IPv6, only IFA_ADDRESS needs to be set. + */ + if (family == AF_INET) { + mnl_attr_put_u32(nlh, IFA_LOCAL, addr.ip); + mnl_attr_put_u32(nlh, IFA_ADDRESS, addr.ip); + } else { + mnl_attr_put(nlh, IFA_ADDRESS, sizeof(struct in6_addr), &addr); + } + + 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); + } + portid = mnl_socket_get_portid(nl); + + 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 < 0) { + perror("mnl_socket_recvfrom"); + exit(EXIT_FAILURE); + } + + ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL); + if (ret < 0) { + perror("mnl_cb_run"); + exit(EXIT_FAILURE); + } + + mnl_socket_close(nl); + + return 0; +} -- cgit v1.2.3