cvspasswd.c

/* Trivial password generator for cvs.  Compile with 'cc -o cvspasswd cvspasswd.c -lcrypt' */
#include        
#include 
#include 

/* Generate a single character of salt given a random integer.  See 'man crypt'. */
int base64(int x)
{
    const char b64[64] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./";
    return b64[x % 64];
}

int main(int argc, char **argv)
{
    char ibuf[256];
    char passwd[256];
    char saltstr[3];
    struct tms t;

    if (argc != 2) {
        fprintf(stderr, "Usage: cvspasswd username\n");
        exit(1);
    }
    fprintf(stderr, "Password for %s: ", argv[1]);
    ibuf[0] = 0;
    fgets(ibuf, sizeof(ibuf), stdin);
    sscanf(ibuf, "%s", passwd);
    saltstr[0] = base64(times(&t));
    saltstr[1] = base64(time(0));
    saltstr[2] = 0;
    
    printf("%s:%s:cvsuser\n", argv[1], crypt(passwd, saltstr));
    exit(0);
}