+int read_config(char *file, struct ma_config *config, int *macs)
+{
+ FILE *f;
+ char line[256];
+ int i;
+
+ f = fopen(file, "r");
+ if (f == NULL) {
+ fprintf(stderr, "Could not read config file %s\n", file);
+ return errno;
+ }
+
+#define INT_OPTION(opt, var) \
+ if (strncmp(line, opt " ", sizeof(opt)) == 0) { \
+ var = atoi(&line[sizeof(opt)]); \
+ }
+#define STRING_OPTION(opt, var) \
+ if (strncmp(line, opt " ", sizeof(opt)) == 0) { \
+ var = strdup(&line[sizeof(opt)]); \
+ }
+
+ while (fgets(line, sizeof(line), f) != NULL) {
+ for (i = strlen(line) - 1; i >= 0 && isspace(line[i]); i--)
+ line[i] = '\0';
+ if (line[0] == '\0' || line[0] == '#')
+ continue;
+
+ if (strncmp(line, "mac ", 4) == 0) {
+ if (*macs >= MAX_MACS) {
+ printf("Can only accept %d MAC addresses to"
+ " watch for.\n", MAX_MACS);
+ exit(EXIT_FAILURE);
+ }
+ sscanf(&line[4],
+ "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+ &config->macs[*macs].mac[0],
+ &config->macs[*macs].mac[1],
+ &config->macs[*macs].mac[2],
+ &config->macs[*macs].mac[3],
+ &config->macs[*macs].mac[4],
+ &config->macs[*macs].mac[5]);
+ config->macs[*macs].valid = true;
+ (*macs)++;
+ } else
+ STRING_OPTION("mqtt_host", config->mqtt_host) else
+ INT_OPTION("mqtt_port", config->mqtt_port) else
+ STRING_OPTION("mqtt_user", config->mqtt_username) else
+ STRING_OPTION("mqtt_pass", config->mqtt_password) else
+ STRING_OPTION("mqtt_topic", config->mqtt_topic) else
+ STRING_OPTION("location", config->location) else
+ STRING_OPTION("capath", config->capath)
+ }
+ fclose(f);
+
+ return 0;
+}
+
+void override_config(const struct ma_config *source, struct ma_config *target)
+{
+ int i;
+
+ if (source->mqtt_host != NULL) {
+ target->mqtt_host = source->mqtt_host;
+ }
+ if (source->mqtt_port != 0) {
+ target->mqtt_port = source->mqtt_port;
+ }
+ if (source->mqtt_username != NULL) {
+ target->mqtt_username = source->mqtt_username;
+ }
+ if (source->mqtt_password != NULL) {
+ target->mqtt_password = source->mqtt_password;
+ }
+ if (source->mqtt_topic != NULL) {
+ target->mqtt_topic = source->mqtt_topic;
+ }
+ if (source->location != NULL) {
+ target->location = source->location;
+ }
+ if (source->capath != NULL) {
+ target->capath = source->capath;
+ }
+ for (i = 0; i < MAX_MACS; ++i) {
+ if (source->macs[i].valid) {
+ memcpy(&target->macs[i], &source->macs[i], sizeof(struct mac_entry));
+ }
+ }
+}
+
+void print_config(const struct ma_config *config)
+{
+ int i, j;
+
+ printf("Config:\n");
+ printf("mqtt_host: %s\n", config->mqtt_host ? config->mqtt_host : "NULL");
+ printf("mqtt_port: %d\n", config->mqtt_port);
+ printf("mqtt_username: %s\n", config->mqtt_username ? config->mqtt_username : "NULL");
+ printf("mqtt_password: %s\n", config->mqtt_password ? config->mqtt_password : "NULL");
+ printf("mqtt_topic: %s\n", config->mqtt_topic ? config->mqtt_topic : "NULL");
+ printf("location: %s\n", config->location ? config->location : "NULL");
+ printf("capath: %s\n", config->capath ? config->capath : "NULL");
+
+ for (i = 0; i < MAX_MACS; ++i) {
+ if (config->macs[i].valid) {
+ printf("macs[%d]: { valid: true, mac: ", i);
+ for (j = 0; j < 6; ++j) {
+ printf("%02x", config->macs[i].mac[j]);
+ if (j < 5) {
+ printf(":");
+ }
+ }
+ printf("\n");
+ } else {
+ printf("macs[%d]: { valid: false }\n", i);
+ }
+ }
+}
+