iptables-parser/iptables_parser.c

#include <stdio.h>
#include <string.h>

int main()
{
    int h,i,j,k,l,v,w,x,y,ctr,dtr;
    char str_in[200];
    char newString[200][200];
    char newParam[100][100];
    char str_final[50];

    char *filename = "/var/log/iptables.log";
    FILE *fp = fopen(filename, "r");

    if (fp == NULL)
    {
        printf("Error: could not open file %s", filename);
        return 1;
    }

    // reading line by line, max 256 bytes
    const unsigned MAX_LENGTH = 256;
    char buffer[MAX_LENGTH];
    
    h = 0;

    while (fgets(buffer, MAX_LENGTH, fp)) {
        h = h + 1;
    }
    
    printf(" %d\n ", h);
    i = 0;
    fclose(fp);

    fp = fopen(filename, "r");

    while (fgets(buffer, MAX_LENGTH, fp)) {
        // printf("- %d -", i);
        if ( i > h-10  ) {

            j=0; ctr=0;
            printf("\n%d -> %s \n", i, buffer);
            printf("[%d]\t[ Param ]\t\t[ Value ] \n", i);

            for (x=0; x <= (strlen(buffer)); x++)

            {
                if(buffer[x]==' '|| buffer[x]=='\0' || buffer[x]=='\n'){
                    newString[ctr][j]='\0';
                    ctr++;
                    j=0;
                }
                else {
                    newString[ctr][j]=buffer[x];
                    j++;
                }
            }

            for (v=0; v <= ctr ; v++) {

                // printf("[ %d ]----> %s \n", v, newString[v]);
                strcpy(str_in, newString[v]);
                // printf("\n[%d]----> %s \n", i, str_in);
                
                k=0; dtr=0;
                memset(newParam, 0, sizeof newParam);
                for (w=0; w <= (strlen(str_in)) ; w++) {


                    if(str_in[w]=='='){
                            newParam[dtr][k]='\0';
                            dtr++;
                            k=0;
                    }
                    // else if(str_in[w]!='\n' && str_in[w]!=' ') {
                    else {
                        newParam[dtr][k]=str_in[w];
                        k++;
                    }

                }
                strcpy(str_final, newParam[0]); 

                // if ( newParam[0] && newParam[0][0] != "\n" ) {

                if ( *str_final == EOF ) {

                // if strcmp(&str_final, '\n') {
                    continue;
                }
                printf("[%d]\t[ %s ]\t\t[ %s ] \n", v, str_final, newParam[1]);
                

                // printf("[ Value %d]----> %s \n", i, newParam[1]);
                // for (l=0; l <= dtr ; l++) {
                //     printf("[ + %d]----> %s \n", w, newParam[l]);
                // }

            }


            // j=0; ctr=0;
            // for (v=0; v <= (strlen(newString)); v++) {
            //     if(newString[v]=='='){
            //         newParam[ctr][j]='\0';
            //         ctr++;
            //         j=0;
            //     }
            //     else {
            //         newParam[ctr][j]=newString[v];
            //         j++;
            //     }
            // }

        }
            i = i +1 ;
            // printf("\n==================================================================================\n");
    }

    // close the file

    fclose(fp);

    return 0;
}