Server config load and graceful client exit

util/util.c

@@ -1,5 +1,12 @@
+#include "fcntl.h"
+#include "unistd.h"
+#include <stddef.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <libconfig.h>
+
+#include "util.h"
 
 static char alphs[] = {'-', '_', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
                        'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
@@ -22,3 +29,93 @@ void get_id(char *id_buf) {
   }
   id_buf[15] = '\0';
 }
+
+// Load configuration using libconfig
+void load_config(server_config_t *cfg, const char *path) {
+  config_t config;
+  config_init(&config);
+
+  if (!config_read_file(&config, path)) {
+    fprintf(stderr, "Error reading config file %s:%d - %s\n",
+            config_error_file(&config),
+            config_error_line(&config),
+            config_error_text(&config));
+    config_destroy(&config);
+    exit(1);
+  }
+
+  // Read clients
+  config_setting_t *clients = config_lookup(&config, "clients");
+  if (!clients) {
+    fprintf(stderr, "No 'clients' section found in config file\n");
+    config_destroy(&config);
+    exit(1);
+  }
+
+  int client_count = config_setting_length(clients);
+  cfg->client_count = client_count;
+  cfg->clients = malloc(sizeof(client_config_t) * client_count);
+
+  for (int i = 0; i < client_count; i++) {
+    config_setting_t *client = config_setting_get_elem(clients, i);
+    const char *client_id, *nickname;
+
+    if (!config_setting_lookup_string(client, "client_id", &client_id) ||
+        !config_setting_lookup_string(client, "nickname", &nickname)) {
+      fprintf(stderr, "Error reading client %d configuration\n", i);
+      config_destroy(&config);
+      exit(1);
+    }
+
+    strncpy(cfg->clients[i].client_id, client_id, COMMAND_LENGTH - 1);
+    cfg->clients[i].client_id[COMMAND_LENGTH - 1] = '\0';
+    strncpy(cfg->clients[i].nickname, nickname, COMMAND_LENGTH - 1);
+    cfg->clients[i].nickname[COMMAND_LENGTH - 1] = '\0';
+  }
+
+  // Read groups
+  config_setting_t *groups = config_lookup(&config, "groups");
+  if (!groups) {
+    fprintf(stderr, "No 'groups' section found in config file\n");
+    config_destroy(&config);
+    exit(1);
+  }
+
+  int group_count = config_setting_length(groups);
+  cfg->group_count = group_count;
+  cfg->groups = malloc(sizeof(group_config_t) * group_count);
+
+  for (int i = 0; i < group_count; i++) {
+    config_setting_t *group = config_setting_get_elem(groups, i);
+    const char *name;
+    config_setting_t *members;
+
+    if (!config_setting_lookup_string(group, "name", &name)) {
+      fprintf(stderr, "Error reading group %d name\n", i);
+      config_destroy(&config);
+      exit(1);
+    }
+
+    strncpy(cfg->groups[i].name, name, COMMAND_LENGTH - 2);
+    cfg->groups[i].name[COMMAND_LENGTH - 2] = '\0';
+
+    members = config_setting_get_member(group, "members");
+    if (!members) {
+      fprintf(stderr, "Error reading group %d members\n", i);
+      config_destroy(&config);
+      exit(1);
+    }
+
+    int member_count = config_setting_length(members);
+    cfg->groups[i].member_count = member_count;
+
+    for (int j = 0; j < member_count; j++) {
+      const char *member_id = config_setting_get_string_elem(members, j);
+      cfg->groups[i].member_ids[j] = malloc(COMMAND_LENGTH);
+      strncpy(cfg->groups[i].member_ids[j], member_id, COMMAND_LENGTH - 1);
+      cfg->groups[i].member_ids[j][COMMAND_LENGTH - 1] = '\0';
+    }
+  }
+
+  config_destroy(&config);
+}