hanez/chkusr
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Added help command (-h) and fixed some things...

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This commit is contained in:
Johannes Findeisen 2024-08-10 15:48:50 +02:00
commit 4267fdfa26
1 changed files with 20 additions and 9 deletions
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29
checkpw.c
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@ -1,8 +1,15 @@
/*
/**
* checkpw is a program that checks the validity of a users password on a
* Linux/PAM-based system.
*
* Usage: checkpw -u $USER -p $PASSWORD
* Usage: ./checkpw [-u <username>] [-p <password>] [-i] [-v] [-h]
*
* Options:
* -u <username> Specify username.
* -p <password> Specify password.
* -i Enable interactive mode to prompt for missing username/password.
* -v Enable verbose mode.
* -h Show this help
*
* Returns 0 on success, 1 otherwise.
*
@ -18,7 +25,7 @@
#include <pwd.h> // For struct passwd and getpwnam
#include <termios.h> // For terminal input settings
#define MAX_USERNAME_LEN 256
#define MAX_USERNAME_LEN 32
#define MAX_PASSWORD_LEN 256
#ifndef MIN_UID
@ -154,12 +161,13 @@ void prompt_for_input(char *buffer, size_t size, const char *prompt, int hide_in
}
void print_usage(const char *prog_name) {
fprintf(stderr, "Usage: %s [-u <username>] [-p <password>] [-i] [-v]\n", prog_name);
fprintf(stderr, "Usage: %s [-u <username>] [-p <password>] [-i] [-v] [-h]\n", prog_name);
fprintf(stderr, "Options:\n");
fprintf(stderr, " -u <username> Specify username.\n");
fprintf(stderr, " -p <password> Specify password.\n");
fprintf(stderr, " -i Enable interactive mode to prompt for missing username/password.\n");
fprintf(stderr, " -v Enable verbose mode.\n");
fprintf(stderr, " -h Show this help.\n");
}
int main(int argc, char *argv[]) {
@ -170,22 +178,25 @@ int main(int argc, char *argv[]) {
int opt;
// Parse command-line arguments
while ((opt = getopt(argc, argv, "u:p:iv")) != -1) {
while ((opt = getopt(argc, argv, "u:p:hiv")) != -1) {
switch (opt) {
case 'u':
if (strlen(optarg) >= MAX_USERNAME_LEN) {
fprintf(stderr, "Error: Username is too long (maximum %d characters).\n", MAX_USERNAME_LEN - 1);
fprintf(stderr, "Error: Username is too long (maximum %d characters).\n", MAX_USERNAME_LEN);
exit(1);
}
strncpy(username, optarg, MAX_USERNAME_LEN - 1);
break;
case 'p':
if (strlen(optarg) >= MAX_PASSWORD_LEN) {
fprintf(stderr, "Error: Password is too long (maximum %d characters).\n", MAX_PASSWORD_LEN - 1);
fprintf(stderr, "Error: Password is too long (maximum %d characters).\n", MAX_PASSWORD_LEN);
exit(1);
}
strncpy(password, optarg, MAX_PASSWORD_LEN - 1);
break;
case 'h':
print_usage(argv[0]);
exit(1);
case 'i':
interactive = 1; // Enable interactive mode
break;
@ -244,10 +255,10 @@ int main(int argc, char *argv[]) {
// Authenticate the user
if (authenticate(username, password, verbose) == 0) {
printf("Authenticated successfully.\n");
return 0;
exit(0);
} else {
printf("Authentication failed.\n");
return 1;
exit(1);
}
}