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osmo-auc-gen: cmdline help: list algorithms; error messages 

In the -h help output, list the names of available algorithms.

In case of option parsing failure, also print help() (so that e.g. for a typo
in the algorithm, the list of algorithms is printed along with the error
message).

If there are -2/-3 or -a missing, show an error message that explains this.

Change-Id: I76732b28d7a553a6293d1707fe398d28b5ef4886
This commit is contained in:
Neels Hofmeyr 2017-02-03 18:36:32 +01:00
parent 94e04604fc
commit 18d65be080
1 changed files with 10 additions and 1 deletions
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11
utils/osmo-auc-gen.c
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@ -70,6 +70,7 @@ static struct osmo_sub_auth_data test_aud = {
static void help()
{
int alg;
printf( "-2 --2g\tUse 2G (GSM) authentication\n"
"-3 --3g\tUse 3G (UMTS) authentication\n"
"-a --algorithm\tSpecify name of the algorithm\n"
@ -81,6 +82,11 @@ static void help()
"-A --auts\tSpecify AUTS (only for 3G)\n"
"-r --rand\tSpecify random value\n"
"-I --ipsec\tOutput in triplets.dat format for strongswan\n");
fprintf(stderr, "\nAvailable algorithms for option -a:\n");
for (alg = 1; alg < _OSMO_AUTH_ALG_NUM; alg++)
fprintf(stderr, " %s\n",
osmo_auth_alg_name(alg));
}
int main(int argc, char **argv)
@ -209,7 +215,8 @@ int main(int argc, char **argv)
}
if (rc < 0) {
fprintf(stderr, "Error parsing argument of option `%c'\n", c);
help();
fprintf(stderr, "\nError parsing argument of option `%c'\n", c);
exit(2);
}
}
@ -229,6 +236,8 @@ int main(int argc, char **argv)
if (test_aud.type == OSMO_AUTH_TYPE_NONE ||
test_aud.algo == OSMO_AUTH_ALG_NONE) {
help();
fprintf(stderr, "\nError: you need to pass at least"
" -2 or -3, as well as an algorithm to use.\n");
exit(2);
}