Subversion Repositories planix.SVN

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

#define NETCHLEN        16              /* max network challenge length */

char *  argv0;
int     debug;
int     delete;

char *  root = "/n/emelie";
char *  user;
char    file[64];
char    challenge[NETCHLEN];
char    response[NETCHLEN];

void
usage(void)
{
        printf("usage: %s [-d] username\n", argv0);
        exit(1);
}

void
main(int argc, char **argv)
{
        int fd, n;

        for(argv0=*argv++,--argc; argc>0; ++argv,--argc){
                if(argv[0][0] != '-' || argv[0][1] == '-')
                        break;
                switch(argv[0][1]){
                case 'D':
                        ++debug;
                        break;
                case 'd':
                        ++delete;
                        break;
                case 'r':
                        root = argv[0][2] ? &argv[0][2] : (--argc, *++argv);
                        break;
                default:
                        usage();
                        break;
                }
        }
        if(argc != 1)
                usage();
        user = argv[0];
        snprintf(file, sizeof file, "%s/#%s", root, user);
        if(debug)
                printf("debug=%d, file=%s\n", debug, file);
        if(delete){
                fd = creat(file, 0600);
                if(fd < 0){
                        perror(file);
                        exit(1);
                }
                exit(0);
        }
        fd = open(file, 2);
        if(fd < 0){
                perror(file);
                exit(1);
        }
        n = read(fd, challenge, NETCHLEN);
        if(debug)
                printf("read %d\n", n);
        if(n <= 0){
                printf("read %d: ", n);
                perror("");
                exit(1);
        }
        printf("challenge: %s\n", challenge);
        write(1, "response: ", 10);
        read(0, response, NETCHLEN-1);
        lseek(fd, 0, 0);
        n = write(fd, response, NETCHLEN);
        if(debug)
                printf("write %d\n", n);
        if(n <= 0){
                printf("write %d: ", n);
                perror("");
                exit(1);
        }
        exit(0);
}