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#include <stdio.h>
#include <string.h>
#define AUTOLOGIN_PATH ".mactelnet"
#define AUTOLOGIN_MAXSTR 100
#define AUTOLOGIN_MAXPROFILES 100
struct autologin {
char identifier[AUTOLOGIN_MAXSTR];
char username[AUTOLOGIN_MAXSTR];
char password[AUTOLOGIN_MAXSTR];
char inuse:1;
char hasUsername:1;
char hasPassword:1;
};
struct autologin logins[AUTOLOGIN_MAXPROFILES];
enum autologin_state {
ALS_NONE,
ALS_PREIDENTIFIER,
ALS_IDENTIFIER,
ALS_PREKEY,
ALS_KEY,
ALS_PREVALUE,
ALS_VALUE
};
#define AL_NONE 0
int main() {
FILE *fp;
char c;
int i = -1;
char *p;
char key[AUTOLOGIN_MAXSTR];
char value[AUTOLOGIN_MAXSTR];
int line_counter=1;
enum autologin_state state = ALS_NONE;
fp = fopen(AUTOLOGIN_PATH, "r");
while ((c = fgetc(fp)) && !feof(fp)) {
if (c == '#') {
while ((c = fgetc(fp)) != '\n' && !feof(fp));
}
switch (state) {
case ALS_PREIDENTIFIER:
i++;
if (i == AUTOLOGIN_MAXPROFILES) {
goto done;
}
p = logins[i].identifier;
state++;
break;
case ALS_PREKEY:
memset(key, 0, AUTOLOGIN_MAXSTR);
memset(value, 0, AUTOLOGIN_MAXSTR);
p = key;
logins[i].inuse = 1;
state++;
break;
case ALS_PREVALUE:
memset(value, 0, AUTOLOGIN_MAXSTR);
p = value;
state++;
break;
}
switch (state) {
case ALS_NONE:
if (c == '[') {
state = ALS_PREIDENTIFIER;
}
break;
case ALS_IDENTIFIER:
if (c == ']') {
//fprintf(stderr, "debug: identifier %s on line %d\n", logins[i].identifier, line_counter);
state = ALS_PREKEY;
break;
}
if (c == '\n') {
fprintf(stderr, "Error on line %d in %s: New line in middle of identifier\n", line_counter, AUTOLOGIN_PATH);
state = ALS_NONE;
break;
}
*p++ = c;
if (p - logins[i].identifier == AUTOLOGIN_MAXSTR-1) {
*p = 0;
fprintf(stderr, "Error on line %d in %s: Identifier string too long.\n", line_counter, AUTOLOGIN_PATH);
while ((c = fgetc(fp)) != '\n' && c != ']' && !feof(fp));
state = ALS_PREKEY;
break;
}
break;
case ALS_KEY:
if (p == key && c == '\n') break;
if (c == '=') {
state = ALS_PREVALUE;
break;
}
if (c == '[') {
state = ALS_PREIDENTIFIER;
break;
}
if (c == ' ') { // ignore whitespace
break;
}
if (c == '\n') {
fprintf(stderr, "Error on line %d in %s: Newline before '=' character\n", line_counter, AUTOLOGIN_PATH);
state = ALS_PREKEY;
break;
}
*p++ = c;
if (p - key == AUTOLOGIN_MAXSTR-1) {
*p = 0;
fprintf(stderr, "Error on line %d in %s: Key string too long.\n", line_counter, AUTOLOGIN_PATH);
while ((c = fgetc(fp)) != '\n' && c != '=' && !feof(fp));
if (c == '\n') {
state = ALS_PREKEY;
} else {
state = ALS_PREVALUE;
}
}
break;
case ALS_VALUE:
if (p == value && c == '\n') break;
if (c == '\n') {
if (strncasecmp(key, "user", AUTOLOGIN_MAXSTR) == 0) {
strncpy(logins[i].username, value, AUTOLOGIN_MAXSTR);
logins[i].hasUsername = 1;
} else if (strncasecmp(key, "password", AUTOLOGIN_MAXSTR) == 0) {
strncpy(logins[i].password, value, AUTOLOGIN_MAXSTR);
logins[i].hasPassword = 1;
} else {
fprintf(stderr, "Warning on line %d of %s: Unknown parameter %s, ignoring.\n", line_counter, AUTOLOGIN_PATH, key);
}
state = ALS_PREKEY;
break;
}
if (c == ' ') { // ignore whitespace
break;
}
*p++ = c;
if (p - value == AUTOLOGIN_MAXSTR-1) {
*p = 0;
fprintf(stderr, "Error on line %d in %s: Value string too long.\n", line_counter, AUTOLOGIN_PATH);
while ((c = fgetc(fp)) != '\n' && !feof(fp));
if (c == '\n') {
state = ALS_PREKEY;
}
}
break;
}
if (c == '\n') {
line_counter++;
}
if (feof(fp)) {
break;
}
}
done:
fclose(fp);
printf("\n\nConfig:\n");
for (i = 0; i < 100; ++i) {
if (logins[i].inuse) {
printf("Profile: '%s'\n", logins[i].identifier);
if (logins[i].hasUsername) {
printf("\tUsername: '%s'\n", logins[i].username);
}
if (logins[i].hasPassword) {
printf("\tPassword: '%s'\n", logins[i].password);
}
printf("\n");
}
}
}
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