学步园

http://www.linuxidc.com/Linux/2007-12/9623p3.htm

These were writed and collected by kf701,
you can use and modify them but NO WARRANTY.
  Contact with me : kf_701@21cn.com

程序1：检测接口的 inet_addr,netmask,broad_addr

#include <stdio.h><br /> #include <string.h><br /> #include <stdlib.h><br /> #include <errno.h><br /> #include <unistd.h><br /> #include <sys/types.h><br /> #include <sys/socket.h><br /> #include <netinet/in.h><br /> #include <arpa/inet.h><br /> #include <sys/ioctl.h><br /> #include <net/if.h></p> <p>static void usage(){<br /> printf("usage : ipconfig interface /n");<br /> exit(0);<br /> }</p> <p>int main(int argc,char **argv)<br /> {<br /> struct sockaddr_in *addr;<br /> struct ifreq ifr;<br /> char *name,*address;<br /> int sockfd;<br /> if(argc != 2)<br /> usage();<br /> else<br /> name = argv[1];<br /> sockfd = socket(AF_INET,SOCK_DGRAM,0);<br /> strncpy(ifr.ifr_name,name,IFNAMSIZ-1);<br /> if(ioctl(sockfd,SIOCGIFADDR,&ifr) == -1)<br /> perror("ioctl error"),exit(1);<br /> addr = (struct sockaddr_in *)&(ifr.ifr_addr);<br /> address = inet_ntoa(addr->sin_addr);<br /> printf("inet addr: %s ",address);<br /> if(ioctl(sockfd,SIOCGIFBRDADDR,&ifr) == -1)<br /> perror("ioctl error"),exit(1);<br /> addr = (struct sockaddr_in *)&ifr.ifr_broadaddr;<br /> address = inet_ntoa(addr->sin_addr);<br /> printf("broad addr: %s ",address);<br /> if(ioctl(sockfd,SIOCGIFNETMASK,&ifr) == -1)<br /> perror("ioctl error"),exit(1);<br /> addr = (struct sockaddr_in *)&ifr.ifr_addr;<br /> address = inet_ntoa(addr->sin_addr);<br /> printf("inet mask: %s ",address);<br /> printf("/n");<br /> exit(0);<br /> }<br />

程序2：检查接口的物理连接是否正常

#include <stdio.h><br /> #include <string.h><br /> #include <errno.h><br /> #include <fcntl.h><br /> #include <getopt.h><br /> #include <sys/socket.h><br /> #include <sys/ioctl.h><br /> #include <net/if.h><br /> #include <stdlib.h><br /> #include <unistd.h><br /> typedef unsigned short u16;<br /> typedef unsigned int u32;<br /> typedef unsigned char u8;<br /> #include <linux/ethtool.h><br /> #include <linux/sockios.h><br /> int detect_mii(int skfd, char *ifname)<br /> {<br /> struct ifreq ifr;<br /> u16 *data, mii_val;<br /> unsigned phy_id;<br /> /* Get the vitals from the interface. */<br /> strncpy(ifr.ifr_name, ifname, IFNAMSIZ);<br /> if (ioctl(skfd, SIOCGMIIPHY, &ifr) < 0)<br /> {<br /> fprintf(stderr, "SIOCGMIIPHY on %s failed: %s/n", ifname,<br /> strerror(errno));<br /> (void) close(skfd);<br /> return 2;<br /> }<br /> data = (u16 *)(&ifr.ifr_data);<br /> phy_id = data[0];<br /> data[1] = 1;<br /> if (ioctl(skfd, SIOCGMIIREG, &ifr) < 0)<br /> {<br /> fprintf(stderr, "SIOCGMIIREG on %s failed: %s/n", ifr.ifr_name,<br /> strerror(errno));<br /> return 2;<br /> }<br /> mii_val = data[3];<br /> return(((mii_val & 0x0016) == 0x0004) ? 0 : 1);<br /> }<br /> int detect_ethtool(int skfd, char *ifname)<br /> {<br /> struct ifreq ifr;<br /> struct ethtool_value edata;<br /> memset(&ifr, 0, sizeof(ifr));<br /> edata.cmd = ETHTOOL_GLINK;<br /> strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)-1);<br /> ifr.ifr_data = (char *) &edata;<br /> if (ioctl(skfd, SIOCETHTOOL, &ifr) == -1)<br /> {<br /> printf("ETHTOOL_GLINK failed: %s/n", strerror(errno));<br /> return 2;<br /> }<br /> return (edata.data ? 0 : 1);<br /> }<br /> int main(int argc, char **argv)<br /> {<br /> int skfd = -1;<br /> char *ifname;<br /> int retval;<br /> if( argv[1] )<br /> ifname = argv[1];<br /> else<br /> ifname = "eth0";<br /> /* Open a socket. */<br /> if (( skfd = socket( AF_INET, SOCK_DGRAM, 0 ) ) < 0 )<br /> {<br /> printf("socket error/n");<br /> exit(-1);<br /> }<br /> retval = detect_ethtool(skfd, ifname);<br /> if (retval == 2)<br /> retval = detect_mii(skfd, ifname);<br /> close(skfd);<br /> if (retval == 2)<br /> printf("Could not determine status/n");<br /> if (retval == 1)<br /> printf("Link down/n");<br /> if (retval == 0)<br /> printf("Link up/n");<br /> return retval;<br /> }<br />

 程序3：更简单一点测试物理连接

#include <stdio.h><br /> #include <stdlib.h><br /> #include <string.h><br /> #include <errno.h><br /> #include <net/if.h><br /> #include <linux/sockios.h><br /> #include <sys/ioctl.h><br /> #define LINKTEST_GLINK 0x0000000a<br /> struct linktest_value {<br /> unsigned int cmd;<br /> unsigned int data;<br /> };</p> <p>static<br /> void<br /> usage(const char * pname)<br /> {<br /> fprintf(stderr, "usage: %s <device>/n", pname);<br /> fprintf(stderr, "returns: /n");<br /> fprintf(stderr, "/t 0: link detected/n");<br /> fprintf(stderr, "/t%d: %s/n", ENODEV, strerror(ENODEV));<br /> fprintf(stderr, "/t%d: %s/n", ENONET, strerror(ENONET));<br /> fprintf(stderr, "/t%d: %s/n", EOPNOTSUPP, strerror(EOPNOTSUPP));<br /> exit(EXIT_FAILURE);<br /> }</p> <p>static<br /> int<br /> linktest(const char * devname)<br /> {<br /> struct ifreq ifr;<br /> struct linktest_value edata;<br /> int fd;<br /> /* setup our control structures. */<br /> memset(&ifr, 0, sizeof(ifr));<br /> strcpy(ifr.ifr_name, devname);<br /> /* open control socket. */<br /> fd=socket(AF_INET, SOCK_DGRAM, 0);<br /> if(fd < 0 ) {<br /> return -ECOMM;<br /> }<br /> errno=0;<br /> edata.cmd = LINKTEST_GLINK;<br /> ifr.ifr_data = (caddr_t)&edata;<br /> if(!ioctl(fd, SIOCETHTOOL, &ifr)) {<br /> if(edata.data) {<br /> fprintf(stdout, "link detected on %s/n", devname);<br /> return 0;<br /> } else {<br /> errno=ENONET;<br /> }<br /> }<br /> perror("linktest");<br /> return errno;<br /> }</p> <p>int<br /> main(int argc, char *argv[])<br /> {<br /> if(argc != 2) {<br /> usage(argv[0]);<br /> }<br /> return linktest(argv[1]);<br /> }<br />

程序4：调节音量

#include <sys/types.h><br /> #include <sys/stat.h><br /> #include <fcntl.h><br /> #include <sys/ioctl.h><br /> #include <sys/soundcard.h><br /> #include <stdio.h><br /> #include <unistd.h><br /> #include <math.h><br /> #include <string.h><br /> #include <stdlib.h><br /> #define BASE_VALUE 257<br /> int main(int argc,char *argv[])<br /> {<br /> int mixer_fd=0;<br /> char *names[SOUND_MIXER_NRDEVICES]=SOUND_DEVICE_LABELS;<br /> int value,i;<br /> printf("/nusage:%s dev_no.[0..24] value[0..100]/n/n",argv[0]);<br /> printf("eg. %s 0 100/n",argv[0]);<br /> printf(" will change the volume to MAX volume./n/n");<br /> printf("The dev_no. are as below:/n");<br /> for (i=0;i<SOUND_MIXER_NRDEVICES;i++){<br /> if (i%3==0) printf("/n");<br /> printf("%s:%d/t/t",names[i],i);<br /> }<br /> printf("/n/n");<br /> if (argc<3)<br /> exit(1);<br /> if ((mixer_fd = open("/dev/mixer",O_RDWR))){<br /> printf("Mixer opened successfully,working.../n");<br /> value=BASE_VALUE*atoi(argv[2]);<br /> if (ioctl(mixer_fd,MIXER_WRITE(atoi(argv[1])),&value)==0)<br /> printf("successfully.....");<br /> else printf("unsuccessfully.....");<br /> printf("done./n");<br /> }else<br /> printf("can't open /dev/mixer error..../n");<br /> exit(0);<br /> }<br />