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缘由：
项目需要
正文：
参考解答：
注意：当头文件include不全时可能会导致core dump，而且不易定位，所以建议在使用之前好好查一下需要包含的头文件列表。
#include <stdio.h>#include <sys/socket.h>#include <sys/ioctl.h>#include <linux/netdevice.h>#include <arpa/inet.h>#include <netinet/in.h>#include <unistd.h>#include <string.h>#ifndef IP_LEN#define IP_LEN 256#endifchar ip[IP_LEN] = "\0";// AF_INET, AF_INET6int print_addresses(const int domain){ int ssssss; ssssss = socket(domain, SOCK_STREAM, 0); if (ssssss < 0) { perror("socket"); return 1; } struct ifconf ifconf; struct ifreq ifr[50]; ifconf.ifc_buf = (char *) ifr; ifconf.ifc_len = sizeof ifr; if (ioctl(ssssss, SIOCGIFCONF, &ifconf) == -1) { perror("ioctl"); return 1; } char a_ip[INET_ADDRSTRLEN]; printf("INET_ADDRSTRLEN = %d\n", INET_ADDRSTRLEN); struct sockaddr_in *s_in; int ifs; ifs = ifconf.ifc_len / sizeof(ifr[0]); printf("interfaces = %d:\n", ifs); int i; for (i = 0; i < ifs; i++) { s_in = (struct sockaddr_in *) &ifr[i].ifr_addr; if (!inet_ntop(domain, &s_in->sin_addr, a_ip, sizeof(a_ip))) { perror("inet_ntop"); return 1; } printf("%s - %s\n", ifr[i].ifr_name, a_ip); if (strcmp(a_ip, "127.0.0.1")) { printf("strncat(*, *, %d)\n", IP_LEN-strlen(ip)-1); strncat(ip, a_ip, IP_LEN-strlen(ip)-1); if (i+1 < ifs) { strcat(ip, ","); } } } printf("\nip = %s\n", ip); close(ssssss); return 0;}int main(int argc, char const *argv[]){ print_addresses(AF_INET); return 0;} |
- socket+ioctl+inet_ntop
- getifaddrs()
- /proc/net/route
- strcat/strncat+strlen
参考链接：
- https://stackoverflow.com/questions/2021549/how-do-i-output-my-host-s-ip-addresses-from-a-c-program
- https://stackoverflow.com/questions/701004/how-to-get-ip-address-programmatically-on-debian-based-system
- http://man7.org/linux/man-pages/man3/getifaddrs.3.html
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- http://blog.csdn.net/ygm_linux/article/details/24661839
- http://walkerqt.blog.51cto.com/1310630/1741099
- http://blog.csdn.net/langeldep/article/details/8306603
- http://www.binarytides.com/get-local-ip-c-linux/
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- http://www.binarytides.com/hostname-to-ip-address-c-sockets-linux/ #gethostbyname() 或 getaddrinfo()
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