netifdebug.c
上传用户:wudi5211
上传日期:2010-01-21
资源大小:607k
文件大小:2k
- /*
- * netifdebug.c -- change the IFF_DEBUG flag of an interface
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.h>
- #include <errno.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <sys/ioctl.h>
- #include <net/if.h>
- #include <netinet/in.h>
- int main(int argc, char **argv)
- {
- int action = -1, sock;
- struct ifreq req;
- char *actname;
- if (argc < 2) {
- fprintf(stderr,"%s: usage is "%s <ifname> [<on|off|tell>]"n",
- argv[0],argv[0]);
- exit(1);
- }
- if (argc==2)
- actname="tell";
- else
- actname=argv[2];
- /* a silly raw socket just for ioctl()ling it */
- sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
- if (sock < 0) {
- fprintf(stderr, "%s: socket(): %sn", argv[0],strerror(errno));
- exit(1);
- }
- /* retrieve flags */
- strcpy(req.ifr_name, argv[1]);
- if ( ioctl(sock, SIOCGIFFLAGS, &req) < 0) {
- fprintf(stderr, " %s: ioctl(SIOCGIFFLAGS): %sn",
- argv[0],strerror(errno));
- exit(1);
- }
- if (!strcmp(actname,"on")
- || !strcmp(actname,"+")
- || !strcmp(actname,"1"))
- action = IFF_DEBUG;
- if (!strcmp(actname,"off")
- || !strcmp(actname,"-")
- || !strcmp(actname,"0"))
- action = 0;
- if (!strcmp(actname,"tell")
- || actname[0]=='t') {
- printf("%s: debug is %sn", argv[1],
- req.ifr_flags & IFF_DEBUG ? "on" : "off");
- exit(0);
- }
- req.ifr_flags &= ~IFF_DEBUG;
- req.ifr_flags |= action;
- if ( ioctl(sock, SIOCSIFFLAGS, &req) < 0) {
- fprintf(stderr, " %s: ioctl(SIOCSIFFLAGS): %sn",
- argv[0],strerror(errno));
- exit(1);
- }
- exit(0);
- }