如何从C代码获取Linux上接口的IPv4地址?
例如,我想获取分配给eth0的IP地址(如果有)。
尝试这个:
#include <stdio.h> #include <unistd.h> #include <string.h> /* for strncpy */ #include <sys/types.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <net/if.h> #include <arpa/inet.h> int main() { int fd; struct ifreq ifr; fd = socket(AF_INET, SOCK_DGRAM, 0); /* I want to get an IPv4 IP address */ ifr.ifr_addr.sa_family = AF_INET; /* I want IP address attached to "eth0" */ strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1); ioctl(fd, SIOCGIFADDR, &ifr); close(fd); /* display result */ printf("%s\n", inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr)); return 0; }
代码示例是从这里获取的。