SIOCSARP: Invalid Argument. Post: 302447674

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Top Forums Programming SIOCSARP: Invalid Argument. Post 302447674 by semash! on Tuesday 24th of August 2010 03:13:47 AM

08-24-2010

Registered User

Hey fpmurphy, thanks for your quick reply. I made some changes in the code and got it working.

I think the errors were on mac_aton() function, the way i used the flags and in the lack of a defined device (arp_dev[16] in the arpreq structure).

With all of that changed, this is the working code, i think it would be of help for someone:

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <net/if.h>
#include <errno.h>
#include <net/if_arp.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <sys/socket.h>

char *mac_ntoa(unsigned char *ptr){
static char address[30];

sprintf(address, "%02X:%02X:%02X:%02X:%02X:%02X",
ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5]);
return(address);
} /* End of mac_ntoa */

int mac_aton(char *addr, unsigned char *ptr){
int i, v[6];
if((i = sscanf(addr, "%x:%x:%x:%x:%x:%x", &v[0], &v[1], &v[2], &v[3],
&v[4], &v[5])) !=6){
fprintf(stderr, "arp: invalid Ethernet address '%s'\n", addr);
return(1);
        } /* End of If*/
for(i = 0; i < 6; i++){
ptr[i] = v[i];
        } /* End of For */
return(0);
}

int main(int argc, char* argv[]){

if(argc < 3 || argc > 4){
fprintf(stderr, "usage: %s <ip_addr> <hw_addr> [temp|pub|perm|trail]\n",
argv[0]);
fprintf(stderr, "default: temp.\n");
exit(-1);
        } /* End of If */

int s, flags;
char *host = argv[1];

struct arpreq req;
struct hostent *hp;
struct sockaddr_in *sin;

bzero((caddr_t)&req, sizeof(req)); /* caddr_t is not really needed. */

sin = (struct sockaddr_in *)&req.arp_pa;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = inet_addr(host);

if(sin->sin_addr.s_addr ==-1){
if(!(hp = gethostbyname(host))){
fprintf(stderr, "arp: %s ", host);
herror((char *)NULL);
return(-1);
        } /* End of If */
bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, sizeof(sin->sin_addr));
        } /* End of If */

if(mac_aton(argv[2], req.arp_ha.sa_data)){ /* If address is valid... */
return(-1);
}

argc -=2;
argv +=2;

flags = ATF_PERM | ATF_COM;

while(argc-- > 0){
if(!(strncmp(argv[0], "temp", 4))){
flags &= ~ATF_PERM;
        } else if(!(strncmp(argv[0], "pub", 3))){
flags |= ATF_PUBL;
        } else if(!(strncmp(argv[0], "trail", 5))){
flags |= ATF_USETRAILERS;
        } else if(!(strncmp(argv[0], "dontpub", 7))){ /* Not working yet */
flags |= ATF_DONTPUB;
        } else if(!(strncmp(argv[0], "perm", 4))){
flags = ATF_PERM;
        } else {
flags &= ~ATF_PERM;
        } /* End of Else*/
argv++;
        }/* End of While */

req.arp_flags = flags; /* Finally, asign the flags to the structure */
strcpy(req.arp_dev, "eth0"); /* Asign the device.  */

if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0){
perror("socket() failed.");
exit(-1);
        } /* End of If */

if(ioctl(s, SIOCSARP, (caddr_t)&req) <0){ /* caddr_t not really needed. */
perror(host);
exit(-1);
        } /* End of If */

printf("ARP cache entry successfully added.\n");
close(s);
return(0);
}

Thank you very much for your help.

Last edited by semash!; 08-25-2010 at 01:18 PM..

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LEARN ABOUT PLAN9

getflags

GETFLAGS(9.2)															     GETFLAGS(9.2)

NAME

       getflags, usage - process flag arguments in argv

SYNOPSIS

       #include <libg.h>

       #include <fb.h>

       int getflags(int argc, char *argv[], char *flags)

       int usage(char *tail)

       extern char **flag[], cmdline[], *cmdname, *flagset[];

DESCRIPTION

       Getflags digests an argument vector argv, finding flag arguments listed in flags.  Flags is a string of flag letters.  A letter followed by
       a colon and a number is expected to have the given number of parameters.  A flag argument starts with `-' and is followed by any number	of
       flag  letters.	A flag with one or more parameters must be the last flag in an argument.  If any characters follow it, they are the flag's
       first parameter.  Otherwise the following argument is the first parameter.  Subsequent parameters are taken from subsequent arguments.

       The global array flag is set to point to an array of parameters for each flag found.  Thus, if flag -x was seen, flag['x'] is non-zero, and
       flag['x'][i] is the flag's ith parameter.  If flag -x has no parameters flag['x']==flagset.  Flags not found are marked with a zero.  Flags
       and their parameters are deleted from argv.  Getflags returns the adjusted argument count.

       Getflags stops scanning for flags upon encountering a non-flag argument, or the argument --, which is deleted.

       Getflags places a pointer to argv[0] in the external variable cmdname.  It also concatenates the original members  of  argv,  separated	by
       spaces, and places the result in the external array cmdline.

       Usage  constructs  a  usage  message,  prints it on the standard error file, and exits with status 1.  The command name printed is argv[0].
       Appropriate flag usage syntax is generated from flags.  As an aid, explanatory information about flag parameters may be included  in  flags
       in  square  brackets as in the example.	Tail is printed at the end of the message.  If getflags encountered an error, usage tries to indi-
       cate the cause.

EXAMPLES

	    main(int argc, char *argv[]){
		 if((argc=getflags(argc, argv, "vinclbhse:1[expr]", 1))==-1)
		      usage("[file ...]");
	    }
       might print:
	    Illegal flag -u
	    Usage: grep [-vinclbhs] [-e expr] [file ...]

SOURCE

       /sys/src/libfb/getflags.c

SEE ALSO

       ARG(2)

DIAGNOSTICS

       Getflags returns -1 on error: a syntax error in flags, setting a flag more than once, setting a flag not mentioned in flags, or running out
       of arguments while collecting a flag's parameters.

																     GETFLAGS(9.2)

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