85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
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/*
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* netifdebug.c -- change the IFF_DEBUG flag of an interface
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*
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* Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
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* Copyright (C) 2001 O'Reilly & Associates
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*
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* The source code in this file can be freely used, adapted,
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* and redistributed in source or binary form, so long as an
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* acknowledgment appears in derived source files. The citation
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* should list that the code comes from the book "Linux Device
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* Drivers" by Alessandro Rubini and Jonathan Corbet, published
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* by O'Reilly & Associates. No warranty is attached;
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* we cannot take responsibility for errors or fitness for use.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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int main(int argc, char **argv)
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{
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int action = -1, sock;
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struct ifreq req;
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char *actname;
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if (argc < 2) {
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fprintf(stderr,"%s: usage is \"%s <ifname> [<on|off|tell>]\"\n",
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argv[0],argv[0]);
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exit(1);
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}
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if (argc==2)
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actname="tell";
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else
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actname=argv[2];
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/* a silly raw socket just for ioctl()ling it */
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sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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if (sock < 0) {
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fprintf(stderr, "%s: socket(): %s\n", argv[0],strerror(errno));
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exit(1);
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}
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/* retrieve flags */
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strcpy(req.ifr_name, argv[1]);
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if ( ioctl(sock, SIOCGIFFLAGS, &req) < 0) {
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fprintf(stderr, " %s: ioctl(SIOCGIFFLAGS): %s\n",
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argv[0],strerror(errno));
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exit(1);
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}
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if (!strcmp(actname,"on")
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|| !strcmp(actname,"+")
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|| !strcmp(actname,"1"))
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action = IFF_DEBUG;
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if (!strcmp(actname,"off")
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|| !strcmp(actname,"-")
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|| !strcmp(actname,"0"))
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action = 0;
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if (!strcmp(actname,"tell")
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|| actname[0]=='t') {
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printf("%s: debug is %s\n", argv[1],
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req.ifr_flags & IFF_DEBUG ? "on" : "off");
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exit(0);
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}
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req.ifr_flags &= ~IFF_DEBUG;
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req.ifr_flags |= action;
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if ( ioctl(sock, SIOCSIFFLAGS, &req) < 0) {
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fprintf(stderr, " %s: ioctl(SIOCSIFFLAGS): %s\n",
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argv[0],strerror(errno));
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exit(1);
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}
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exit(0);
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}
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