libmnl
1.0.3
|
00001 /* This example is placed in the public domain. */ 00002 #include <stdio.h> 00003 #include <stdlib.h> 00004 #include <unistd.h> 00005 #include <time.h> 00006 00007 #include <libmnl/libmnl.h> 00008 #include <linux/if.h> 00009 #include <linux/if_link.h> 00010 #include <linux/rtnetlink.h> 00011 00012 static int data_attr_cb(const struct nlattr *attr, void *data) 00013 { 00014 /* skip unsupported attribute in user-space */ 00015 if (mnl_attr_type_valid(attr, IFLA_MAX) < 0) 00016 return MNL_CB_OK; 00017 00018 switch(mnl_attr_get_type(attr)) { 00019 case IFLA_MTU: 00020 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { 00021 perror("mnl_attr_validate"); 00022 return MNL_CB_ERROR; 00023 } 00024 printf("mtu=%d ", mnl_attr_get_u32(attr)); 00025 break; 00026 case IFLA_IFNAME: 00027 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) { 00028 perror("mnl_attr_validate2"); 00029 return MNL_CB_ERROR; 00030 } 00031 printf("name=%s ", mnl_attr_get_str(attr)); 00032 break; 00033 } 00034 return MNL_CB_OK; 00035 } 00036 00037 static int data_cb(const struct nlmsghdr *nlh, void *data) 00038 { 00039 struct ifinfomsg *ifm = mnl_nlmsg_get_payload(nlh); 00040 00041 printf("index=%d type=%d flags=%d family=%d ", 00042 ifm->ifi_index, ifm->ifi_type, 00043 ifm->ifi_flags, ifm->ifi_family); 00044 00045 if (ifm->ifi_flags & IFF_RUNNING) 00046 printf("[RUNNING] "); 00047 else 00048 printf("[NOT RUNNING] "); 00049 00050 mnl_attr_parse(nlh, sizeof(*ifm), data_attr_cb, NULL); 00051 printf("\n"); 00052 return MNL_CB_OK; 00053 } 00054 00055 int main(void) 00056 { 00057 struct mnl_socket *nl; 00058 char buf[MNL_SOCKET_BUFFER_SIZE]; 00059 struct nlmsghdr *nlh; 00060 struct rtgenmsg *rt; 00061 int ret; 00062 unsigned int seq, portid; 00063 00064 nlh = mnl_nlmsg_put_header(buf); 00065 nlh->nlmsg_type = RTM_GETLINK; 00066 nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; 00067 nlh->nlmsg_seq = seq = time(NULL); 00068 rt = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg)); 00069 rt->rtgen_family = AF_PACKET; 00070 00071 nl = mnl_socket_open(NETLINK_ROUTE); 00072 if (nl == NULL) { 00073 perror("mnl_socket_open"); 00074 exit(EXIT_FAILURE); 00075 } 00076 00077 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { 00078 perror("mnl_socket_bind"); 00079 exit(EXIT_FAILURE); 00080 } 00081 portid = mnl_socket_get_portid(nl); 00082 00083 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { 00084 perror("mnl_socket_send"); 00085 exit(EXIT_FAILURE); 00086 } 00087 00088 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 00089 while (ret > 0) { 00090 ret = mnl_cb_run(buf, ret, seq, portid, data_cb, NULL); 00091 if (ret <= MNL_CB_STOP) 00092 break; 00093 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); 00094 } 00095 if (ret == -1) { 00096 perror("error"); 00097 exit(EXIT_FAILURE); 00098 } 00099 00100 mnl_socket_close(nl); 00101 00102 return 0; 00103 }