From c46d01b5afd2da4779efb2700469037eca6122be Mon Sep 17 00:00:00 2001
From: Luke Bratch <luke@bratch.co.uk>
Date: Sat, 11 May 2019 15:01:22 +0100
Subject: Implement a configuration file reader, an example configuration file,
 and start reading nick/username/realname from it instead of being statically
 defined.

---
 config.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 config.c

(limited to 'config.c')

diff --git a/config.c b/config.c
new file mode 100644
index 0000000..ca6b158
--- /dev/null
+++ b/config.c
@@ -0,0 +1,103 @@
+#include "config.h"
+
+// Check to see if a line is the configuration option specified by
+// checking to see if str starts with conf followed by a space, a tab,
+// or an equals sign.
+// Returns the length of the name of the requested option if found, or
+// zero if not.
+long int isconf(char *str, char *conf) {
+  char *ret;
+  char substr[MAXCHAR];
+  long int len = strlen(conf);
+
+  // Ensure the next character is an equals sign, a space, or a tab
+  if (str[len] != '=' && str[len] != ' ' && str[len] != ' ') {
+    return 0;
+  }
+
+  strncpy(substr, str, len);
+  substr[len] = '\0';
+
+
+  if (!(ret = strstr(substr, conf)) == 0) {
+    return len;
+  }
+
+  return 0;
+}
+
+// Extracts the value of a configuration option from a string.  Expects
+// to receive the string and the number of characters long that the
+// configuration option name is.
+void getconf(char *str, long int start) {
+  long int len = strlen(str);
+  long int pos;
+  char conf[MAXCHAR];
+
+  for (long int i = start; i < len; i++) {
+    if (str[i] == '=' || str[i] == ' ' || str[i] == ' ') {
+      continue;
+    } else {
+      pos = i;
+      break;
+    }
+  }
+
+  strncpy(conf, str + pos, len - pos - 1); // Copy remainder to new string and lop off the newline
+  conf[len - pos - 1] = '\0'; // Null terminate
+
+   // Check for start and end quotes
+  if (conf[0] != '"' || conf[strlen(conf) - 1] != '"') {
+    printf("Error reading configuration option, not enclosed in double quotes!\n");
+    exit(1);
+  }
+
+  strncpy(str, conf + 1, strlen(conf) - 2); // Copy result back to original string without quotes
+  str[strlen(conf) - 2] = '\0'; // Null terminate
+}
+
+int readnames(char *nick, char *username, char *realname) {
+  FILE *fp;
+  char str[MAXCHAR];
+  char* filename = "blabouncer.conf";
+
+  // Set all strings to zero-length to begin
+  nick[0] = '\0';
+  username[0] = '\0';
+  realname[0] = '\0';
+
+  fp = fopen(filename, "r");
+
+  if (fp == NULL) {
+    printf("error: could not open configuration file '%s.'", filename);
+    return 1;
+  }
+  while (fgets(str, MAXCHAR, fp) != NULL) {
+    long int len;
+    if ((len = isconf(str, "nick"))) {
+      getconf(str, len);
+      strncpy(nick, str, strlen(str));
+      nick[strlen(str)] = '\0';
+      printf("Nick is: '%s', length '%ld'.\n", nick, strlen(nick));
+    } else if ((len = isconf(str, "username"))) {
+      getconf(str, len);
+      strncpy(username, str, strlen(str));
+      username[strlen(str)] = '\0';
+      printf("Username is: '%s', length '%ld'.\n", username, strlen(username));
+    } else if ((len = isconf(str, "realname"))) {
+      getconf(str, len);
+      strncpy(realname, str, strlen(str));
+      realname[strlen(str)] = '\0';
+      printf("Real name is: '%s', length '%ld'.\n", realname, strlen(realname));
+    }
+  }
+
+  // Ensure we have everything required
+  if (!strlen(nick) || !strlen(username) || !strlen(realname)) {
+    printf("Failed to read nick and/or username and/or real name from configuration file.\n");
+    exit(1);
+  }
+
+  fclose(fp);
+  return 1;
+}
-- 
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