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Linux 获得机器的IP和网卡信息
Linux 获得机器的IP和网卡信息
代码来自于网络, 我改写了, 有美不敢自专, 特分享之.用法很简单,就3个函数.
头文件getmac.h:
/** * getmac.h * * 2014-07-08: init created */ #ifndef GETMAC_H_INCLUDED #define GETMAC_H_INCLUDED #if defined(__cplusplus) extern "C" { #endif #include <stdio.h> #include <string.h> #include <errno.h> #include <sys/types.h> #include <sys/param.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <net/if.h> #include <netinet/in.h> #include <net/if_arp.h> #include <arpa/inet.h> #include <unistd.h> #ifdef SOLARIS # include <sys/sockio.h> #endif #define GETMAC_MAX_INTERFACES 16 #define GETMAC_MAX_MSGLEN 256 #define GETMAC_SUCCESS 0 #define GETMAC_ERROR (-1) #define GETMAC_EATTR (-2) typedef int GETMAC_BOOL; #define GETMAC_TRUE 1 #define GETMAC_FALSE 0 typedef struct { int fd; struct ifreq buf[GETMAC_MAX_INTERFACES]; struct arpreq arp; int ifaces; } getmac_info_t; typedef struct { int errcode; char errmsg[GETMAC_MAX_MSGLEN]; } getmac_error_t; #define GETMAC_ATTR_IFNAME 0 #define GETMAC_ATTR_IS_PROMISC 1 #define GETMAC_ATTR_IS_UP 2 #define GETMAC_ATTR_IPADDR 3 #define GETMAC_ATTR_HDADDR 4 extern int getmac_init (getmac_info_t * mi, getmac_error_t * err); extern int getmac_attr (getmac_info_t * mi, int i, int attr, void * value, getmac_error_t * err); extern void getmac_fini (getmac_info_t * mi); #if defined(__cplusplus) } #endif #endif /* GETMAC_H_INCLUDED */
C文件getmac.c:
/** * getmac.c * * 2014-07-08: init created */ #include "getmac.h" int getmac_init (getmac_info_t * mi, getmac_error_t * err) { int fd; struct ifconf ifc; bzero (mi, sizeof(getmac_info_t)); mi->fd = -1; fd = socket (AF_INET, SOCK_DGRAM, 0); if (fd == -1) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "socket() error (%d): %s", strerror(errno)); return GETMAC_ERROR; } /* prepare to get mac numb */ ifc.ifc_len = sizeof(mi->buf); ifc.ifc_buf = (caddr_t) mi->buf; if (ioctl (fd, SIOCGIFCONF, (char *) &ifc)) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "ioctl() error (%d): %s", strerror(errno)); close (fd); return GETMAC_ERROR; } mi->ifaces = ifc.ifc_len / sizeof (struct ifreq); mi->fd = fd; /* return numb of mac */ return mi->ifaces; } int getmac_attr (getmac_info_t * mi, int i, int attr, void * value, getmac_error_t * err) { if (mi->fd == -1) { snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "getmac_init should be invoked first"); return GETMAC_ERROR; } if (attr == GETMAC_ATTR_IS_PROMISC || attr == GETMAC_ATTR_IS_UP || attr == GETMAC_ATTR_IFNAME) { if (! mi->buf[i].ifr_name[0]) { if (ioctl (mi->fd, SIOCGIFFLAGS, (char *) & mi->buf[i])) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "ioctl(SIOCGIFFLAGS) error (%d): %s", strerror(errno)); return GETMAC_ERROR; } } if (attr == GETMAC_ATTR_IS_PROMISC) { /* whether the net card status is promisc */ if (mi->buf[i].ifr_flags & IFF_PROMISC) { * ((GETMAC_BOOL *) value) = GETMAC_TRUE; } else { * ((GETMAC_BOOL *) value) = GETMAC_FALSE; } } else if (attr == GETMAC_ATTR_IS_UP) { /* whether the net card status is up */ if (mi->buf[i].ifr_flags & IFF_UP) { * ((GETMAC_BOOL *) value) = GETMAC_TRUE; } else { * ((GETMAC_BOOL *) value) = GETMAC_FALSE; } } else { /* device name */ strcpy (value, mi->buf[i].ifr_name); } return GETMAC_SUCCESS; } else if (attr == GETMAC_ATTR_IPADDR || attr == GETMAC_ATTR_HDADDR) { /* get ip address of net card */ if (ioctl (mi->fd, SIOCGIFADDR, (char *) & mi->buf[i])) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "ioctl(SIOCGIFADDR) error (%d): %s", strerror(errno)); return GETMAC_ERROR; } if (attr == GETMAC_ATTR_IPADDR) { strcpy (value, inet_ntoa (((struct sockaddr_in*) (& mi->buf[i].ifr_addr))->sin_addr)); return GETMAC_SUCCESS; } else { /* get Hardware Address */ #ifdef SOLARIS do { mi->arp.arp_pa.sa_family = AF_INET; mi->arp.arp_ha.sa_family = AF_INET; ((struct sockaddr_in *) & mi->arp.arp_pa)->sin_addr.s_addr = ((struct sockaddr_in*)(& buf[intrface].ifr_addr))->sin_addr.s_addr; if ((ioctl (mi->fd, SIOCGARP, (char *) & mi->arp))) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "ioctl(SIOCGARP) error (%d): %s", strerror(errno)); return GETMAC_ERROR; } else { sprintf (value, "%02x:%02x:%02x:%02x:%02x:%02x", (unsigned char) mi->arp.arp_ha.sa_data[0], (unsigned char) mi->arp.arp_ha.sa_data[1], (unsigned char) mi->arp.arp_ha.sa_data[2], (unsigned char) mi->arp.arp_ha.sa_data[3], (unsigned char) mi->arp.arp_ha.sa_data[4], (unsigned char) mi->arp.arp_ha.sa_data[5] ); return GETMAC_SUCCESS; } } while (0); #else #if 0 do { /* get HW ADDRESS of the net card */ if (ioctl (mi->fd, SIOCGENADDR, (char *) &buf[i])) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "ioctl(SIOCGENADDR) error (%d): %s", strerror(errno)); return GETMAC_ERROR; } sprintf("%02x:%02x:%02x:%02x:%02x:%02x", (unsigned char) mi->buf[i].ifr_enaddr[0], (unsigned char) mi->buf[i].ifr_enaddr[1], (unsigned char) mi->buf[i].ifr_enaddr[2], (unsigned char) mi->buf[i].ifr_enaddr[3], (unsigned char) mi->buf[i].ifr_enaddr[4], (unsigned char) mi->buf[i].ifr_enaddr[5]); return GETMAC_SUCCESS; } while (0); #else do { if (ioctl (mi->fd, SIOCGIFHWADDR, (char *) & mi->buf[i])) { err->errcode = errno; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "ioctl(SIOCGIFHWADDR) error (%d): %s", strerror(errno)); return GETMAC_ERROR; } sprintf (value, "%02x:%02x:%02x:%02x:%02x:%02x", (unsigned char) mi->buf[i].ifr_hwaddr.sa_data[0], (unsigned char) mi->buf[i].ifr_hwaddr.sa_data[1], (unsigned char) mi->buf[i].ifr_hwaddr.sa_data[2], (unsigned char) mi->buf[i].ifr_hwaddr.sa_data[3], (unsigned char) mi->buf[i].ifr_hwaddr.sa_data[4], (unsigned char) mi->buf[i].ifr_hwaddr.sa_data[5]); return GETMAC_SUCCESS; } while (0); #endif #endif } } else { err->errcode = GETMAC_EATTR; snprintf (err->errmsg, GETMAC_MAX_MSGLEN, "error attr specified"); return GETMAC_EATTR; } } void getmac_fini (getmac_info_t * mi) { if (mi->fd != -1) { close (mi->fd); mi->fd = -1; } }
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