Initial config parser

1 files changed, 141 insertions, 0 deletions

diff --git a/src/config.c b/src/config.c
new file mode 100644
index 0000000..847af6e
--- /dev/null
+++ b/src/config.c
@@ -0,0 +1,141 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "config.h"
+#include "ini.h"
+
+struct gmnisrv_host *
+gmnisrv_config_get_host(struct gmnisrv_config *conf, const char *hostname)
+{
+	struct gmnisrv_host *host = conf->hosts;
+	while (host) {
+		if (strcmp(host->hostname, hostname) == 0) {
+			return host;
+		}
+		host = host->next;
+	}
+	return NULL;
+}
+
+static int
+parse_listen(struct gmnisrv_config *conf, const char *value)
+{
+	// TODO
+	(void)conf;
+	(void)value;
+	return 1;
+}
+
+static int
+conf_ini_handler(void *user, const char *section,
+	const char *name, const char *value)
+{
+	struct gmnisrv_config *conf = (struct gmnisrv_config *)user;
+	struct {
+		char *section;
+		char *name;
+		char **value;
+	} strvars[] = {
+		{ ":tls", "store", &conf->tls.store },
+		{ ":tls", "organization", &conf->tls.organization },
+		{ ":tls", "email", &conf->tls.email },
+	};
+	struct {
+		char *section;
+		char *name;
+		int (*fn)(struct gmnisrv_config *conf, const char *value);
+	} fnvars[] = {
+		{ "", "listen", &parse_listen, }
+	};
+
+	for (size_t i = 0; i < sizeof(strvars) / sizeof(strvars[0]); ++i) {
+		if (strcmp(strvars[i].section, section) != 0) {
+			continue;
+		}
+		if (strcmp(strvars[i].name, name) != 0) {
+			continue;
+		}
+		*strvars[i].value = strdup(value);
+		return 1;
+	}
+
+	for (size_t i = 0; i < sizeof(fnvars) / sizeof(fnvars[0]); ++i) {
+		if (strcmp(fnvars[i].section, section) != 0) {
+			continue;
+		}
+		if (strcmp(fnvars[i].name, name) != 0) {
+			continue;
+		}
+		return fnvars[i].fn(conf, value);
+	}
+
+	if (section[0] == '\0' || section[0] == ':') {
+		fprintf(stderr, "Unknown config option [%s]%s\n", section, name);
+		return 0;
+	}
+
+	struct gmnisrv_host *host = gmnisrv_config_get_host(conf, section);
+	if (!host) {
+		host = calloc(1, sizeof(struct gmnisrv_host));
+		host->hostname = strdup(section);
+		host->next = conf->hosts;
+		conf->hosts = host;
+	}
+
+	struct {
+		char *name;
+		char **value;
+	} host_strvars[] = {
+		{ "root", &host->root },
+	};
+
+	for (size_t i = 0; i < sizeof(host_strvars) / sizeof(host_strvars[0]); ++i) {
+		if (strcmp(host_strvars[i].name, name) != 0) {
+			continue;
+		}
+		*host_strvars[i].value = strdup(value);
+		return 1;
+	}
+
+	fprintf(stderr, "Unknown config option [%s]%s\n", section, name);
+	return 0;
+}
+
+static int
+validate_config(struct gmnisrv_config *conf)
+{
+	if (!conf->binds) {
+		fprintf(stderr, "Error: config missing listen directive\n");
+		return 1;
+	}
+	if (!conf->hosts) {
+		fprintf(stderr, "Error: config defines no hosts\n");
+		return 1;
+	}
+	if (!conf->tls.store) {
+		fprintf(stderr, "Error: config defines no certificate store\n");
+		return 1;
+	}
+	return 0;
+}
+
+int
+load_config(struct gmnisrv_config *conf, const char *path)
+{
+	FILE *f = fopen(path, "r");
+	if (!f) {
+		fprintf(stderr, "Error opening %s: %s\n",
+				path, strerror(errno));
+		return 1;
+	}
+
+	int n = ini_parse_file(f, conf_ini_handler, conf);
+	fclose(f);
+	if (n != 0) {
+		fprintf(stderr, "at %s:%d\n", path, n);
+		return 1;
+	}
+
+	return validate_config(conf);
+}