From 09288ad1ffee955f0e0d5859a2f2e05e447c1f59 Mon Sep 17 00:00:00 2001
From: Håkon Nessjøen <haakon.nessjoen@gmail.com>
Date: Sun, 30 Jun 2013 15:32:23 +0200
Subject: First version of auto-login config file reader

---
 autologin.c | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 175 insertions(+)
 create mode 100644 autologin.c

diff --git a/autologin.c b/autologin.c
new file mode 100644
index 0000000..e9a90b7
--- /dev/null
+++ b/autologin.c
@@ -0,0 +1,175 @@
+#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_IDENTIFIER,
+	ALS_KEY,
+	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_NONE:
+				if (c == '[') {
+					state = ALS_IDENTIFIER;
+					i++;
+					p = logins[i].identifier;
+				}
+				break;
+
+			case ALS_IDENTIFIER:
+				if (c == ']') {
+					//fprintf(stderr, "debug: identifier %s on line %d\n", logins[i].identifier, line_counter);
+					state = ALS_KEY;
+					memset(key, 0, AUTOLOGIN_MAXSTR);
+					memset(value, 0, AUTOLOGIN_MAXSTR);
+					p = key;
+					logins[i].inuse = 1;
+					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;
+					line_counter++;
+					break;
+				}
+				*p++ = c;
+				if (p - logins[i].identifier > AUTOLOGIN_MAXSTR) {
+					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));
+					if (c == '\n') line_counter++;
+					state = ALS_KEY;
+					memset(key,0,AUTOLOGIN_MAXSTR);
+					memset(value, 0, AUTOLOGIN_MAXSTR);
+					p = key;
+					break;
+				}
+				break;
+
+			case ALS_KEY:
+				if (p == key && c == '\n') break;
+				if (c == '=') {
+					state = ALS_VALUE;
+					memset(value, 0, AUTOLOGIN_MAXSTR);
+					p = value;
+					break;
+				}
+				if (c == '[') {
+					state = ALS_IDENTIFIER;
+					i++;
+					p = logins[i].identifier;
+					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_KEY;
+					memset(key, 0, AUTOLOGIN_MAXSTR);
+					memset(value, 0, AUTOLOGIN_MAXSTR);
+					p = key;
+					break;
+				}
+				*p++ = c;
+				if (p - key > AUTOLOGIN_MAXSTR) {
+					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_KEY;
+						memset(key, 0, AUTOLOGIN_MAXSTR);
+						memset(value, 0, AUTOLOGIN_MAXSTR);
+						p = key;
+					} else {
+						state = ALS_VALUE;
+						memset(value, 0, AUTOLOGIN_MAXSTR);
+						p = value;
+					}
+				}
+				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_KEY;
+					memset(key, 0, AUTOLOGIN_MAXSTR);
+					memset(value, 0, AUTOLOGIN_MAXSTR);
+					p = key;
+					break;
+				}
+				if (c == ' ') { // ignore whitespace
+					break;
+				}
+				*p++ = c;
+				if (p - value > AUTOLOGIN_MAXSTR) {
+					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_KEY;
+						memset(key, 0, AUTOLOGIN_MAXSTR);
+						memset(value, 0, AUTOLOGIN_MAXSTR);
+						p = key;
+					}
+				}
+				break;
+		}
+		if (c == '\n') {
+			line_counter++;
+		}
+	}
+	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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