X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=config.cpp;h=57bf10a7f0ddc038f892a4e08b62706341d98842;hp=b6ad99bee05b329d288f5fcd20d190d26015e05f;hb=b08dc2a81825a298a03f2dee2ae7dd7045e72739;hpb=aeda7b341454f243ff8a3d742222c24bf75c338d

diff --git a/config.cpp b/config.cpp
index b6ad99b..57bf10a 100644
--- a/config.cpp
+++ b/config.cpp
@@ -1,24 +1,94 @@
+#include <arpa/inet.h>
+#include <assert.h>
+#include <ctype.h>
+#include <stdint.h>
 #include <stdio.h>
-#include <string.h>
 #include <stdlib.h>
-#include <ctype.h>
-#include <assert.h>
-#include <vector>
+#include <string.h>
+#include <sys/socket.h>
+#include <map>
 #include <string>
+#include <utility>
+#include <vector>
 
+#include "acceptor.h"
 #include "config.h"
+#include "log.h"
 #include "parse.h"
 
 using namespace std;
 
-vector<ConfigLine> parse_config(const string &filename)
+#define DEFAULT_BACKLOG_SIZE 1048576
+
+struct ConfigLine {
+	string keyword;
+	vector<string> arguments;
+	map<string, string> parameters;
+};
+
+namespace {
+
+bool parse_hostport(const string &hostport, sockaddr_in6 *addr)
 {
-	vector<ConfigLine> ret;
+	memset(addr, 0, sizeof(*addr));
+	addr->sin6_family = AF_INET6;
+
+	string port_string;
+
+	// See if the argument if on the type [ipv6addr]:port.
+	if (!hostport.empty() && hostport[0] == '[') {
+		size_t split = hostport.find("]:");
+		if (split == string::npos) {
+			log(ERROR, "address '%s' is malformed; must be either [ipv6addr]:port or ipv4addr:port");
+			return false;
+		}
+
+		string host(hostport.begin() + 1, hostport.begin() + split);
+		port_string = hostport.substr(split + 2);
+
+		if (inet_pton(AF_INET6, host.c_str(), &addr->sin6_addr) != 1) {
+			log(ERROR, "'%s' is not a valid IPv6 address");
+			return false;
+		}
+	} else {
+		// OK, then it must be ipv4addr:port.
+		size_t split = hostport.find(":");
+		if (split == string::npos) {
+			log(ERROR, "address '%s' is malformed; must be either [ipv6addr]:port or ipv4addr:port");
+			return false;
+		}
+
+		string host(hostport.begin(), hostport.begin() + split);
+		port_string = hostport.substr(split + 1);
+
+		// Parse to an IPv4 address, then construct a mapped-v4 address from that.
+		in_addr addr4;
+
+		if (inet_pton(AF_INET, host.c_str(), &addr4) != 1) {
+			log(ERROR, "'%s' is not a valid IPv4 address");
+			return false;
+		}
+
+		addr->sin6_addr.s6_addr32[2] = htonl(0xffff);
+		addr->sin6_addr.s6_addr32[3] = addr4.s_addr;
+	}
+
+	int port = atoi(port_string.c_str());
+	if (port < 1 || port >= 65536) {
+		log(ERROR, "port %d is out of range (must be [1,65536>).", port);
+		return false;
+	}
+	addr->sin6_port = ntohs(port);
+
+	return true;
+}
 
+bool read_config(const string &filename, vector<ConfigLine> *lines)
+{
 	FILE *fp = fopen(filename.c_str(), "r");
 	if (fp == NULL) {
-		perror(filename.c_str());
-		exit(1);
+		log_perror(filename.c_str());
+		return false;
 	}
 
 	char buf[4096];
@@ -59,68 +129,292 @@ vector<ConfigLine> parse_config(const string &filename)
 			}
 		}
 
-		ret.push_back(line);
+		lines->push_back(line);
 	}
 
-	fclose(fp);
-	return ret;
+	if (fclose(fp) == EOF) {
+		log_perror(filename.c_str());
+		return false;
+	}
+	return true;
 }
 
-string fetch_config_string(const vector<ConfigLine> &config, const string &keyword,
-                           ParameterType parameter_type, const string &default_value)
+bool fetch_config_string(const vector<ConfigLine> &config, const string &keyword, string *value)
 {
-	assert(parameter_type == PARAMATER_MANDATORY || parameter_type == PARAMETER_OPTIONAL);
 	for (unsigned i = 0; i < config.size(); ++i) {
 		if (config[i].keyword != keyword) {
 			continue;
 		}
 		if (config[i].parameters.size() > 0 ||
 		    config[i].arguments.size() != 1) {
-			fprintf(stderr, "ERROR: '%s' takes one argument and no parameters\n", keyword.c_str());
-			exit(1);
+			log(ERROR, "'%s' takes one argument and no parameters", keyword.c_str());
+			return false;
 		}
-		return config[i].arguments[0];
-	}
-	if (parameter_type == PARAMATER_MANDATORY) {
-		fprintf(stderr, "ERROR: Missing '%s' statement in config file.\n",
-			keyword.c_str());
-		exit(1);
-	} else {
-		return default_value;
+		*value = config[i].arguments[0];
+		return true;
 	}
+	return false;
 }
 
-int fetch_config_int(const std::vector<ConfigLine> &config, const std::string &keyword,
-                     int min_limit, int max_limit,
-                     ParameterType parameter_type, int default_value)
+bool fetch_config_int(const vector<ConfigLine> &config, const string &keyword, int *value)
 {
-	assert(parameter_type == PARAMATER_MANDATORY || parameter_type == PARAMETER_OPTIONAL);
-	bool value_found = false;
-	int value = -1;
 	for (unsigned i = 0; i < config.size(); ++i) {
 		if (config[i].keyword != keyword) {
 			continue;
 		}
 		if (config[i].parameters.size() > 0 ||
 		    config[i].arguments.size() != 1) {
-			fprintf(stderr, "ERROR: '%s' takes one argument and no parameters\n", keyword.c_str());
-			exit(1);
+			log(ERROR, "'%s' takes one argument and no parameters", keyword.c_str());
+			return false;
 		}
-		value_found = true;
-		value = atoi(config[i].arguments[0].c_str());  // TODO: verify int validity.
+		*value = atoi(config[i].arguments[0].c_str());  // TODO: verify int validity.
+		return true;
+	}
+	return false;
+}
+
+bool parse_port(const ConfigLine &line, Config *config)
+{
+	if (line.arguments.size() != 1) {
+		log(ERROR, "'port' takes exactly one argument");
+		return false;
+	}
+
+	int port = atoi(line.arguments[0].c_str());
+	if (port < 1 || port >= 65536) {
+		log(ERROR, "port %d is out of range (must be [1,65536>).", port);
+		return false;
+	}
+
+	AcceptorConfig acceptor;
+	acceptor.addr = CreateAnyAddress(port);
+
+	config->acceptors.push_back(acceptor);
+	return true;
+}
+
+bool parse_listen(const ConfigLine &line, Config *config)
+{
+	if (line.arguments.size() != 1) {
+		log(ERROR, "'listen' takes exactly one argument");
+		return false;
+	}
+
+	AcceptorConfig acceptor;
+	if (!parse_hostport(line.arguments[0], &acceptor.addr)) {
+		return false;
+	}
+	config->acceptors.push_back(acceptor);
+	return true;
+}
+
+bool parse_stream(const ConfigLine &line, Config *config)
+{
+	if (line.arguments.size() != 1) {
+		log(ERROR, "'stream' takes exactly one argument");
+		return false;
+	}
+
+	StreamConfig stream;
+	stream.url = line.arguments[0];
+
+	map<string, string>::const_iterator src_it = line.parameters.find("src");
+	if (src_it == line.parameters.end()) {
+		log(WARNING, "stream '%s' has no src= attribute, clients will not get any data.",
+		        stream.url.c_str());
+	} else {
+		stream.src = src_it->second;
+		// TODO: Verify that the URL is parseable?
+	}
+
+	map<string, string>::const_iterator backlog_it = line.parameters.find("backlog_size");
+	if (backlog_it == line.parameters.end()) {
+		stream.backlog_size = DEFAULT_BACKLOG_SIZE;
+	} else {
+		stream.backlog_size = atoi(backlog_it->second.c_str());
+	}
+
+	// Parse encoding.
+	map<string, string>::const_iterator encoding_parm_it = line.parameters.find("encoding");
+	if (encoding_parm_it == line.parameters.end() ||
+	    encoding_parm_it->second == "raw") {
+		stream.encoding = StreamConfig::STREAM_ENCODING_RAW;
+	} else if (encoding_parm_it->second == "metacube") {
+		stream.encoding = StreamConfig::STREAM_ENCODING_METACUBE;
+	} else {
+		log(ERROR, "Parameter 'encoding' must be either 'raw' (default) or 'metacube'");
+		return false;
+	}
+
+	// Parse the pacing rate, converting from kilobits to bytes as needed.
+	map<string, string>::const_iterator pacing_rate_it = line.parameters.find("pacing_rate_kbit");
+	if (pacing_rate_it == line.parameters.end()) {
+		stream.pacing_rate = ~0U;
+	} else {
+		stream.pacing_rate = atoi(pacing_rate_it->second.c_str()) * 1024 / 8;
+	}
+
+	config->streams.push_back(stream);
+	return true;
+}
+
+bool parse_udpstream(const ConfigLine &line, Config *config)
+{
+	if (line.arguments.size() != 1) {
+		log(ERROR, "'udpstream' takes exactly one argument");
+		return false;
+	}
+
+	UDPStreamConfig udpstream;
+
+	string hostport = line.arguments[0];
+	if (!parse_hostport(hostport, &udpstream.dst)) {
+		return false;
+	}
+
+	map<string, string>::const_iterator src_it = line.parameters.find("src");
+	if (src_it == line.parameters.end()) {
+		// This is pretty meaningless, but OK, consistency is good.
+		log(WARNING, "udpstream to %s has no src= attribute, clients will not get any data.",
+		        hostport.c_str());
+	} else {
+		udpstream.src = src_it->second;
+		// TODO: Verify that the URL is parseable?
+	}
+
+	// Parse the pacing rate, converting from kilobits to bytes as needed.
+	map<string, string>::const_iterator pacing_rate_it = line.parameters.find("pacing_rate_kbit");
+	if (pacing_rate_it == line.parameters.end()) {
+		udpstream.pacing_rate = ~0U;
+	} else {
+		udpstream.pacing_rate = atoi(pacing_rate_it->second.c_str()) * 1024 / 8;
+	}
+
+	// Parse the TTL. The same value is used for unicast and multicast.
+	map<string, string>::const_iterator ttl_it = line.parameters.find("ttl");
+	if (ttl_it == line.parameters.end()) {
+		udpstream.ttl = -1;
+	} else {
+		udpstream.ttl = atoi(ttl_it->second.c_str());
+	}
+
+	config->udpstreams.push_back(udpstream);
+	return true;
+}
+
+bool parse_error_log(const ConfigLine &line, Config *config)
+{
+	if (line.arguments.size() != 0) {
+		log(ERROR, "'error_log' takes no arguments (only parameters type= and filename=)");
+		return false;
 	}
-	if (!value_found) {
-		if (parameter_type == PARAMETER_OPTIONAL) {
-			return default_value;
+
+	LogConfig log_config;
+	map<string, string>::const_iterator type_it = line.parameters.find("type");
+	if (type_it == line.parameters.end()) {
+		log(ERROR, "'error_log' has no type= parameter");
+		return false; 
+	}
+
+	string type = type_it->second;
+	if (type == "file") {
+		log_config.type = LogConfig::LOG_TYPE_FILE;
+	} else if (type == "syslog") {
+		log_config.type = LogConfig::LOG_TYPE_SYSLOG;
+	} else if (type == "console") {
+		log_config.type = LogConfig::LOG_TYPE_CONSOLE;
+	} else {
+		log(ERROR, "Unknown log type '%s'", type.c_str());
+		return false; 
+	}
+
+	if (log_config.type == LogConfig::LOG_TYPE_FILE) {
+		map<string, string>::const_iterator filename_it = line.parameters.find("filename");
+		if (filename_it == line.parameters.end()) {
+			log(ERROR, "error_log type 'file' with no filename= parameter");
+			return false; 
 		}
-		fprintf(stderr, "ERROR: Missing '%s' statement in config file.\n",
-			keyword.c_str());
-		exit(1);
+		log_config.filename = filename_it->second;
+	}
+
+	config->log_destinations.push_back(log_config);
+	return true;
+}
+
+}  // namespace
+
+bool parse_config(const string &filename, Config *config)
+{
+	vector<ConfigLine> lines;
+	if (!read_config(filename, &lines)) {
+		return false;
+	}
+
+	config->daemonize = false;
+
+	if (!fetch_config_int(lines, "num_servers", &config->num_servers)) {
+		log(ERROR, "Missing 'num_servers' statement in config file.");
+		return false;
+	}
+	if (config->num_servers < 1 || config->num_servers >= 20000) {  // Insanely high max limit.
+		log(ERROR, "'num_servers' is %d, needs to be in [1, 20000>.", config->num_servers);
+		return false;
+	}
+
+        // See if the user wants stats.
+	config->stats_interval = 60;
+	bool has_stats_file = fetch_config_string(lines, "stats_file", &config->stats_file);
+	bool has_stats_interval = fetch_config_int(lines, "stats_interval", &config->stats_interval);
+	if (has_stats_interval && !has_stats_file) {
+		log(WARNING, "'stats_interval' given, but no 'stats_file'. No client statistics will be written.");
 	}
-	if (value < min_limit || value > max_limit) {
-		fprintf(stderr, "ERROR: '%s' is set to %d, must be in [%d,%d]\n",
-			keyword.c_str(), value, min_limit, max_limit);
-		exit(1);
+
+	config->input_stats_interval = 60;
+	bool has_input_stats_file = fetch_config_string(lines, "input_stats_file", &config->input_stats_file);
+	bool has_input_stats_interval = fetch_config_int(lines, "input_stats_interval", &config->input_stats_interval);
+	if (has_input_stats_interval && !has_input_stats_file) {
+		log(WARNING, "'input_stats_interval' given, but no 'input_stats_file'. No input statistics will be written.");
+	}
+	
+	fetch_config_string(lines, "access_log", &config->access_log_file);
+
+	for (size_t i = 0; i < lines.size(); ++i) {
+		const ConfigLine &line = lines[i];
+		if (line.keyword == "num_servers" ||
+		    line.keyword == "stats_file" ||
+		    line.keyword == "stats_interval" ||
+		    line.keyword == "input_stats_file" ||
+		    line.keyword == "input_stats_interval" ||
+		    line.keyword == "access_log") {
+			// Already taken care of, above.
+		} else if (line.keyword == "port") {
+			if (!parse_port(line, config)) {
+				return false;
+			}
+		} else if (line.keyword == "listen") {
+			if (!parse_listen(line, config)) {
+				return false;
+			}
+		} else if (line.keyword == "stream") {
+			if (!parse_stream(line, config)) {
+				return false;
+			}
+		} else if (line.keyword == "udpstream") {
+			if (!parse_udpstream(line, config)) {
+				return false;
+			}
+		} else if (line.keyword == "error_log") {
+			if (!parse_error_log(line, config)) {
+				return false;
+			}
+		} else if (line.keyword == "daemonize") {
+			config->daemonize = true;
+		} else {
+			log(ERROR, "Unknown configuration keyword '%s'.",
+			        line.keyword.c_str());
+			return false;
+		}
 	}
-	return value;
+
+	return true;
 }