int main(int argc, char **argv) {
if (argc != 3) {
usage(argv[0]);
}
int count, i, netsum, total = 0;
register int checksum = 0;
unsigned char buf[MTU];
unsigned char dst[MACLEN];
unsigned char src[MACLEN];
// parse destination and source mac addresses
if (readmac(argv[1], dst) != 1 || readmac(argv[2], src) != 1) {
perror("argument error");
exit(EXIT_FAILURE);
}
while (!feof(stdin)) {
// attempt to read a full payload
count = fread(buf, sizeof(char), MTU, stdin);
// error in input
if (ferror(stdin)) {
perror("read error");
exit(EXIT_FAILURE);
}
// build and output frame
frame(dst, src, count, buf);
printf("\n");
// accumulate checksum
for (i = 0; i < sizeof(buf); i++) {
checksum += buf[i];
}
// accumulate total bytes read
total += count;
}
// convert byte order from checksum register
netsum = htonl(checksum);
// copy checksum into buffer
memcpy(buf, &netsum, CHECKLEN);
// fill buffer with 0s
memset(buf + CHECKLEN, 0, MTU - CHECKLEN);
// build and output checksum frame
frame(dst, src, MTU, buf);
printf("\n");
exit(EXIT_SUCCESS);
}
char* find_nic4mac(char *findmac) {
DIR *dir;
struct dirent *dirzeiger;
char temp[STRING_SIZE], temp2[STRING_SIZE];
if((dir=opendir(SYSDIR)) == NULL) {
fprintf(flog,"Fehler bei opendir (find_name4nic) ...\n");
return NULL;
}
sprintf(temp, "");
while((dirzeiger=readdir(dir)) != NULL) {
if(*((*dirzeiger).d_name) != '.' & strcmp(((*dirzeiger).d_name), "lo") != 0) {
sprintf(temp2, "%s", readmac((*dirzeiger).d_name) );
if (strcmp(findmac, temp2) == 0) {
sprintf(temp,"%s", (*dirzeiger).d_name);
break;
}
}
}
if(closedir(dir) == -1) fprintf(flog,"Fehler beim schliessen von %s\n", SYSDIR);
strcpy(g_temp, temp);
return g_temp;
}