C语言实现linux网卡检测-改进版

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C语言+shell 实现linux网卡状态检测和 C语言实现linux网卡连接检测 2文的方法各有缺陷，比如有些系统执行ifconfig需要root权限，要不就不支持ioctl(fd, SIOCGMIIPHY, &ifr)这样的操作。以下给出了C语言实现linux网卡连接检测的改进版实现与C语言+shell 实现linux网卡状态检测同样的功能。

#include <stdlib.h>#include <stdio.h>#include <string.h>#include <unistd.h>#include <sys/socket.h>#include <sys/ioctl.h>#include <linux/if.h>#include <linux/mii.h>#include <linux/sockios.h>#include <errno.h>#include <ifaddrs.h>#include <arpa/inet.h> #include  <linux/ethtool.h>int cshell_netlink_status(char *if_name){char    buffer[BUFSIZ];char    cmd[100];FILE    *read_fp;int        chars_read;int        ret =0;memset( buffer, 0, BUFSIZ );memset( cmd, 0, 100 );sprintf(cmd, "ifconfig -a | grep %s",if_name);read_fp = popen(cmd, "r");if ( read_fp != NULL ){chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);pclose(read_fp);if (chars_read > 0){ret = 1;}else{fprintf(stderr, "DEVICE_NONE\r\n");return 0;}}if(ret == 1){memset( buffer, 0, BUFSIZ );memset( cmd, 0, 100 );sprintf(cmd, "ifconfig |grep %s",if_name);read_fp = popen(cmd, "r");if ( read_fp != NULL ){chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);pclose(read_fp);if (chars_read > 0){ret = 2;}else{fprintf(stderr, "DEVICE_DOWN\r\n");return 1;}}}if(ret == 2){memset( buffer, 0, BUFSIZ );memset( cmd, 0, 100 );sprintf(cmd, "ifconfig %s | grep RUNNING |  awk '{print $3}'",if_name);read_fp = popen(cmd, "r");if ( read_fp != NULL ){    chars_read = fread(buffer, sizeof(char), BUFSIZ-1, read_fp);    pclose(read_fp);    if (chars_read > 0)    {fprintf(stderr, "DEVICE_LINKED\r\n");return 3;    }    else    {fprintf(stderr, "DEVICE_UNPLUGGED\r\n");return 2;    }}}return -1;}int c_netlink_status(const char *if_name ){int fd = -1; struct ifreq ifr; struct ifconf ifc;  struct ifreq ifrs_buf[100]; int if_number =0;int i;if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0){fprintf(stderr, "%s: socket error [%d] %s\r\n",if_name, errno, strerror(errno));close(fd);return -1; }ifc.ifc_len = sizeof(ifrs_buf);  ifc.ifc_buf = (caddr_t)ifrs_buf;  if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) <0)  {fprintf(stderr, "%s: ioctl SIOCGIFCONF error [%d] %s\r\n",if_name, errno, strerror(errno));close(fd);return -1; }if_number = ifc.ifc_len / sizeof(struct ifreq);for(i=0; i< if_number; i++){if(strcmp(if_name,ifrs_buf[i].ifr_name ) == 0){break;}}if(i >= if_number){close(fd);fprintf(stderr, "DEVICE_NONE\r\n");return 0;}bzero(&ifr, sizeof(ifr));strncpy(ifr.ifr_name, if_name, IFNAMSIZ-1); ifr.ifr_name[IFNAMSIZ-1] = 0; if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) <0)  {fprintf(stderr, "%s: ioctl SIOCGIFFLAGS error [%d] %s\r\n",if_name, errno, strerror(errno));close(fd);return -1; }#if 1if(!(ifr.ifr_flags & IFF_UP)){close(fd);fprintf(stderr, "DEVICE_DOWN\r\n");return 1;}if(!(ifr.ifr_flags & IFF_RUNNING)){close(fd);fprintf(stderr, "DEVICE_UNPLUGGED\r\n");return 2 ;}fprintf(stderr, "DEVICE_LINKED\r\n");return 3;#else{struct ethtool_value edata;if(!(ifr.ifr_flags & IFF_UP) || !(ifr.ifr_flags & IFF_RUNNING)){close(fd);fprintf(stderr, "%s: DOWN\r\n",if_name);return 1;}edata.cmd = ETHTOOL_GLINK;edata.data = 0;ifr.ifr_data = (char *) &edata;if(ioctl( fd, SIOCETHTOOL, &ifr ) < 0){fprintf(stderr, "%s: ioctl SIOCETHTOOL error [%d] %s\r\n",if_name, errno, strerror(errno));close(fd);return -1; }if(edata.data == 0){fprintf(stderr, "DEVICE_UNPLUGGED\r\n");return 2; }else{fprintf(stderr, "DEVICE_LINKED\r\n");return 3; }}#endif}int main(int argc, char* argv[]){int i=0;if(argc != 2){fprintf(stderr, "usage: %s <ethname>\r\n", argv[0]);return -1;}i = cshell_netlink_status(argv[1]);printf( "cshell_netlink_status if_status = %d\n", i );i = c_netlink_status(argv[1]);printf( "c_netlink_status if_status = %d\n", i );return 0;}

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