Cannot get interface flags: Invalid argument

This is a discussion on Cannot get interface flags: Invalid argument within the C Programming forums, part of the General Programming Boards category; I am not able to connect flag interface using my program function. I need help. Please help me to solve ...

  1. #1
    Registered User
    Join Date
    Jan 2008
    Posts
    20

    Thumbs down Cannot get interface flags: Invalid argument

    I am not able to connect flag interface using my program function. I need help. Please help me to solve this problem.

    Code:
    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/time.h>
    #include <sys/socket.h>
    #include <sys/file.h>
    #include <stdlib.h>
    #include <sys/time.h>
    #include <netinet/in.h>
    #include <netdb.h>
    #include <string.h>
    #include <errno.h>
    #include <ctype.h>
    #include <malloc.h>
    #include <netinet/in_systm.h>
    #include <net/if_arp.h>
    #include <net/if.h>
    #include <netinet/udp.h>
    #define __FAVOR_BSD
    #include <netinet/tcp.h> 
    //#include <netinet/udp.h>
    #include <netinet/ip.h>
    #include <netinet/ip_icmp.h>
    #include <linux/if_ether.h>
    #include <syslog.h>
    
    #define PKTLEN 96	/* Should be enough for what we want */
    #ifndef IP_MF
    #define IP_MF	0x2000
    #endif
    
    /***** WATCH LEVELS ******/
    
    #define MYSELFONLY	1
    #define MYSUBNET	2
    #define HUMANITARIAN	3
    
    /***** REPORT LEVELS *****/
    
    #define REPORTALL	1
    #define REPORTDOS	2
    #define REPORTSCAN	3
    
    struct floodinfo {
        u_short sport;
        struct floodinfo *next;
    };
    
    struct addrlist {
        u_long saddr;
        int cnt;
        int wwwcnt;
        struct addrlist *next;
    };
    
    struct atk {
        u_long saddr;
        u_char eaddr[ETH_ALEN];
        time_t atktime;
    };
    
    struct pktin {
        u_long saddr;
        u_short sport;
        u_short dport;
        time_t timein;
        u_char eaddr[ETH_ALEN];
        struct floodinfo *fi;
        struct pktin *next;
    };
    
    struct scaninfo {
        u_long addr;
        struct atk teardrop;
        struct atk land;
        struct atk icmpfrag;
        struct pktin *tcpin;
        struct pktin *udpin;
        struct scaninfo *next;
        u_long icmpcnt;
    } ;
    
    struct scaninfo *Gsilist = NULL, *Gsi;
    
    u_long Gmaddr;
    time_t Gtimer = 10, Gtimein;
    int Gportlimit = 7;
    int Gsynflood = 8;
    int Gwebcount = 40;
    int Gicmplimit = 5;
    int Gwatchlevel = MYSELFONLY;
    int Greportlevel = REPORTALL;
    char *Gprogramname, *Gdevice = "eth0";
    
    /******** IP packet info ********/
    
    u_long Gsaddr, Gdaddr;
    int Giplen, Gisfrag, Gid;
    
    /****** Externals *************/
    int SIOCGIFFLAGS;
    int SIOCSIFFLAGS;
    
    
    extern int errno;
    extern char *optarg;
    extern int optind, opterr;
    
    void do_tcp(), do_udp(), do_icmp(), print_info(), process_packet();
    void addtcp(), addudp(), clear_pktin(), buildnet();
    void doargs(), usage(), addfloodinfo(), rmfloodinfo();
    struct scaninfo *doicare(), *addtarget();
    char *anetaddr(), *ether_ntoa();
    u_char *readdevice();
    int SIOCGIFFLAGS;
    int SIOCSIFFLAGS;
    
    main(argc, argv)
    int argc;
    char *argv[];
    {
        int pktlen = 0, i, netfd;
        u_char *pkt;
        char hostname[32];
        struct hostent *hp;
        time_t t;
    
        doargs(argc, argv);
        openlog("WATCHER", 0, LOG_DAEMON);
        if(gethostname(hostname, sizeof(hostname)) < 0)
        {
    	perror("gethostname");
    	exit(-1);
        }
        if((hp = gethostbyname(hostname)) == NULL)
        {
    	fprintf(stderr, "Cannot find own address\n");
    	exit(-1);
        }
        memcpy((char *)&Gmaddr, hp->h_addr, hp->h_length);
        buildnet();
        if((netfd = initdevice(O_RDWR, 0)) < 0)
    	exit(-1);
    
        /* Now read packets forever and process them. */
    
        t = time((time_t *)0);
        while(pkt = readdevice(netfd, &pktlen))
        {
    	process_packet(pkt, pktlen);
    	if(time((time_t *)0) - t > Gtimer)
    	{
    	    /* Times up.  Print what we found and clean out old stuff. */
    
    	    for(Gsi = Gsilist, i = 0; Gsi; Gsi = Gsi->next, i++)
    	    {
                    clear_pktin(Gsi);
    	        print_info();
    		Gsi->icmpcnt = 0;
    	    }
    	    t = time((time_t *)0);
    	}
        }
    }
    
    /************************************************************************
    Function:  initdevice
    
    Description: Set up the network device so we can read it.
    
    **************************************************************************/
    initdevice(int fd_flags, u_long dflags)
    
    {
        struct ifreq ifr;
        int fd, flags = 0;
    
        if((fd = socket(PF_INET, SOCK_PACKET, htons(0x0003))) < 0)
        {
    	perror("Cannot open device socket");
    	exit(-1);
        }
    
        /* Get the existing interface flags */
    
        strcpy(ifr.ifr_name, Gdevice);
        if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0)
        {
    	perror("Cannot get interface flags");
    	exit(-1);
        }
    
        ifr.ifr_flags |= IFF_PROMISC;
        if(ioctl(fd, SIOCSIFFLAGS,  &ifr) < 0)
        {
    	perror("Cannot set interface flags");
    	exit(-1);
        }
        
        return(fd);
    }

  2. #2
    Kernel hacker
    Join Date
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    Location
    Farncombe, Surrey, England
    Posts
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    Don't post multiple posts regarding the same subject - if you have additional questions or updates, reply to your own thread:
    Cannot get interface flags: Invalid argument

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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