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/*
* keygen_args.cpp
*
* Notes: since argv[] array contains c-style char strings, I chose to use C
* functions to work on them instead of dealing with C++ class string
* conversions.
*
*/
#include "keygen_args.h"
#include "miller_rabin.h"
char *pubkey;
char *prikey;
long prime_p;
long prime_q;
int random_f;
int keygen_args(int argc, char **argv)
{
/* flags */
int primep_f = 0;
int primeq_f = 0;
int fname_f = 0;
int usage_f = 0;
random_f = 0;
int primep_args = 0;
int primeq_args = 0;
int fname_args = 0;
int opt_args = 0;
int i;
for (i = 1; i < argc; i++)
{
if (argc > 9)
{
fprintf(stderr, "too many options\n");
usage_f = 1;
break;
}
/* skip non option arguments */
if (!strchr(argv[i], '-'))
{
opt_args++;
if (primep_f)
{
if (i-1 == primep_f)
primep_args++;
/* not allowed to have 2 args */
if ((i-2 == primep_f) && argv[i-1][0] != '-')
{
fprintf(stderr, "too many arguments to \"-p\" option\n");
usage_f = 1;
break;
}
}
if (primeq_f)
{
if (i-1 == primeq_f)
primeq_args++;
/* not allowed to have 2 args */
if ((i-2 == primeq_f) && argv[i-1][0] != '-')
{
fprintf(stderr, "too many arguments to \"-q\" option\n");
usage_f = 1;
break;
}
}
if (fname_f)
{
if ((i-1 == fname_f) || (i-2 == fname_f))
fname_args++;
if ((i-3 == fname_f)) /* not allowed to have 3 args */
{
fprintf(stderr, "too many arguments to \"-o\" option\n");
usage_f = 1;
break;
}
}
continue;
}
else if (strcmp(argv[i], "-p") == 0)
primep_f = i;
else if (strcmp(argv[i], "-q") == 0)
primeq_f = i;
else if (strcmp(argv[i], "-o") == 0)
fname_f = i;
else if (strcmp(argv[i], "-c") == 0)
random_f = i;
else
{
fprintf(stderr, "unknown option \"%s\"\n", argv[i]);
usage_f = 1;
break;
}
}
/* error checking */
if (usage_f || opt_args > 4 || fname_args == 1)
{
if (fname_args == 1)
fprintf(stderr, "too few arguments to \"-o\" option\n");
printf("usage: %s [-p] [-q] [-o pubkey prikey] [-c]\n", argv[0]);
exit(EXIT_FAILURE);
}
ssize_t amount_read = 0;
int args_parsed = 0;
size_t line_sz = 0;
char *line_ptr = NULL;
/* handle key filenames */
if (fname_args == 2)
{
pubkey = strdup(argv[fname_f+1]);
prikey = strdup(argv[fname_f+2]);
}
else if (fname_f) /* fname_args equals 0 here */
{
/* ask user for the filenames */
puts("please provide pubkey and prikey filenames separated by a space");
printf("e.g. \"pubkey.xml prikey.xml\": ");
pubkey = (char *) malloc(sizeof(char) * 100);
prikey = (char *) malloc(sizeof(char) * 100);
if (!line_ptr || !pubkey || !prikey)
{
perror("malloc");
exit(EXIT_FAILURE);
}
do
{
fflush(stdin);
amount_read = getline(&line_ptr, &line_sz, stdin);
args_parsed = sscanf(line_ptr, "%s %s", pubkey, prikey);
if (args_parsed != 2)
fprintf(stderr, "invalid input, please try again: ");
} while (args_parsed != 2);
}
else
{
pubkey = strdup("pubkey.xml");
prikey = strdup("prikey.xml");
}
if (primep_f)
{
/* if number was not specified or it's not a prime ask for the number */
if (primep_args == 0)
{
printf("please provide a value for prime p: ");
do
{
fflush(stdin);
amount_read = getline(&line_ptr, &line_sz, stdin);
args_parsed = sscanf(line_ptr, "%ld", &prime_p);
if (args_parsed != 1)
fprintf(stderr, "invalid input, please try again: ");
if (!miller_rabin_16(prime_p))
fprintf(stderr, "not a prime number, please try again: ");
} while (args_parsed != 1 || !miller_rabin_16(prime_p));
}
else
{
prime_p = atol(argv[primep_f+1]);
if (!miller_rabin_16(prime_p))
{
fprintf(stderr, "prime p on the command line is not prime\n");
exit(EXIT_FAILURE);
}
}
}
if (primeq_f)
{
/* if number was not specified or it's not a prime ask for the number */
if (primeq_args == 0)
{
printf("please provide a value for prime q: ");
do
{
fflush(stdin);
amount_read = getline(&line_ptr, &line_sz, stdin);
args_parsed = sscanf(line_ptr, "%ld", &prime_q);
if (args_parsed != 1)
fprintf(stderr, "invalid input, please try again: ");
if (!miller_rabin_16(prime_q))
fprintf(stderr, "not a prime number, please try again: ");
} while (args_parsed != 1 || !miller_rabin_16(prime_q));
}
else
{
prime_q = atol(argv[primeq_f+1]);
if (!miller_rabin_16(prime_q))
{
fprintf(stderr, "prime q on the command line is not prime\n");
exit(EXIT_FAILURE);
}
}
}
if (line_ptr)
free(line_ptr);
return 0;
}
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