使用ioctl SIOCSIFHWADDR设置MAC要使用ARPHRD_ETHER

最新推荐文章于 2023-11-09 20:53:41 发布

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本文详细介绍了如何通过使用SIOCSIFHWADDR接口来设置MAC地址，并且强调了在操作前停用网络接口的重要性。文章还包含了设置和修改MAC地址的代码示例，以及调整网络接口状态（启用或禁用）的方法。

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使用SIOCSIFHWADDR设置MAC要使用ARPHRD_ETHER，且要先停用网络接口。

#include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <stdlib.h> #include <sys/ioctl.h> #include <net/if.h> #include <net/if_arp.h> #define ETHER_ADDR_LEN 6 #define UP 1 #define DOWN 0 int get_mac_addr(char *ifname, char *mac) { int fd, rtn; struct ifreq ifr; if( !ifname || !mac ) { return -1; } fd = socket(AF_INET, SOCK_DGRAM, 0 ); if ( fd < 0 ) { perror("socket"); return -1; } ifr.ifr_addr.sa_family = AF_INET; strncpy(ifr.ifr_name, (const char *)ifname, IFNAMSIZ - 1 ); if ( (rtn = ioctl(fd, SIOCGIFHWADDR, &ifr) ) == 0 ) memcpy( mac, (unsigned char *)ifr.ifr_hwaddr.sa_data, 6); close(fd); return rtn; } int set_mac_addr(char *ifname, char *mac) { int fd, rtn; struct ifreq ifr; if( !ifname || !mac ) { return -1; } fd = socket(AF_INET, SOCK_DGRAM, 0 ); if ( fd < 0 ) { perror("socket"); return -1; } ifr.ifr_addr.sa_family = ARPHRD_ETHER; strncpy(ifr.ifr_name, (const char *)ifname, IFNAMSIZ - 1 ); memcpy((unsigned char *)ifr.ifr_hwaddr.sa_data, mac, 6); if ( (rtn = ioctl(fd, SIOCSIFHWADDR, &ifr) ) != 0 ){ perror("SIOCSIFHWADDR"); } close(fd); return rtn; } int if_updown(char *ifname, int flag) { int fd, rtn; struct ifreq ifr; if (!ifname) { return -1; } fd = socket(AF_INET, SOCK_DGRAM, 0 ); if ( fd < 0 ) { perror("socket"); return -1; } ifr.ifr_addr.sa_family = AF_INET; strncpy(ifr.ifr_name, (const char *)ifname, IFNAMSIZ - 1 ); if ( (rtn = ioctl(fd, SIOCGIFFLAGS, &ifr) ) == 0 ) { if ( flag == DOWN ) ifr.ifr_flags &= ~IFF_UP; else if ( flag == UP ) ifr.ifr_flags |= IFF_UP; } if ( (rtn = ioctl(fd, SIOCSIFFLAGS, &ifr) ) != 0) { perror("SIOCSIFFLAGS"); } close(fd); return rtn; } /* * Convert Ethernet address string representation to binary data * @param a string in xx:xx:xx:xx:xx:xx notation * @param e binary data * @return TRUE if conversion was successful and FALSE otherwise */ int ether_atoe(const char *a, unsigned char *e) { char *c = (char *) a; int i = 0; memset(e, 0, ETHER_ADDR_LEN); for (;;) { e[i++] = (unsigned char) strtoul(c, &c, 16); if (!*c++ || i == ETHER_ADDR_LEN) break; } return (i == ETHER_ADDR_LEN); } /* * Convert Ethernet address binary data to string representation * @param e binary data * @param a string in xx:xx:xx:xx:xx:xx notation * @return a */ char * ether_etoa(const unsigned char *e, char *a) { char *c = a; int i; for (i = 0; i < ETHER_ADDR_LEN; i++) { if (i) *c++ = ':'; c += sprintf(c, "%02X", e[i] & 0xff); } return a; }