8 #include <sys/socket.h>
21 #define DEFAULT_BACKLOG_SIZE 1048576
25 vector<string> arguments;
26 map<string, string> parameters;
31 bool parse_hostport(const string &hostport, sockaddr_in6 *addr)
33 memset(addr, 0, sizeof(*addr));
34 addr->sin6_family = AF_INET6;
38 // See if the argument if on the type [ipv6addr]:port.
39 if (!hostport.empty() && hostport[0] == '[') {
40 size_t split = hostport.find("]:");
41 if (split == string::npos) {
42 log(ERROR, "address '%s' is malformed; must be either [ipv6addr]:port or ipv4addr:port");
46 string host(hostport.begin() + 1, hostport.begin() + split);
47 port_string = hostport.substr(split + 2);
49 if (inet_pton(AF_INET6, host.c_str(), &addr->sin6_addr) != 1) {
50 log(ERROR, "'%s' is not a valid IPv6 address");
54 // OK, then it must be ipv4addr:port.
55 size_t split = hostport.find(":");
56 if (split == string::npos) {
57 log(ERROR, "address '%s' is malformed; must be either [ipv6addr]:port or ipv4addr:port");
61 string host(hostport.begin(), hostport.begin() + split);
62 port_string = hostport.substr(split + 1);
64 // Parse to an IPv4 address, then construct a mapped-v4 address from that.
67 if (inet_pton(AF_INET, host.c_str(), &addr4) != 1) {
68 log(ERROR, "'%s' is not a valid IPv4 address");
72 addr->sin6_addr.s6_addr32[2] = htonl(0xffff);
73 addr->sin6_addr.s6_addr32[3] = addr4.s_addr;
76 int port = atoi(port_string.c_str());
77 if (port < 1 || port >= 65536) {
78 log(ERROR, "port %d is out of range (must be [1,65536>).", port);
81 addr->sin6_port = ntohs(port);
86 bool read_config(const string &filename, vector<ConfigLine> *lines)
88 FILE *fp = fopen(filename.c_str(), "r");
90 log_perror(filename.c_str());
96 if (fgets(buf, sizeof(buf), fp) == NULL) {
100 // Chop off the string at the first #, \r or \n.
101 buf[strcspn(buf, "#\r\n")] = 0;
103 // Remove all whitespace from the end of the string.
104 size_t len = strlen(buf);
105 while (len > 0 && isspace(buf[len - 1])) {
109 // If the line is now all blank, ignore it.
114 vector<string> tokens = split_tokens(buf);
115 assert(!tokens.empty());
118 line.keyword = tokens[0];
120 for (size_t i = 1; i < tokens.size(); ++i) {
121 // foo=bar is a parameter; anything else is an argument.
122 size_t equals_pos = tokens[i].find_first_of('=');
123 if (equals_pos == string::npos) {
124 line.arguments.push_back(tokens[i]);
126 string key = tokens[i].substr(0, equals_pos);
127 string value = tokens[i].substr(equals_pos + 1, string::npos);
128 line.parameters.insert(make_pair(key, value));
132 lines->push_back(line);
135 if (fclose(fp) == EOF) {
136 log_perror(filename.c_str());
142 bool fetch_config_string(const vector<ConfigLine> &config, const string &keyword, string *value)
144 for (unsigned i = 0; i < config.size(); ++i) {
145 if (config[i].keyword != keyword) {
148 if (config[i].parameters.size() > 0 ||
149 config[i].arguments.size() != 1) {
150 log(ERROR, "'%s' takes one argument and no parameters", keyword.c_str());
153 *value = config[i].arguments[0];
159 bool fetch_config_int(const vector<ConfigLine> &config, const string &keyword, int *value)
161 for (unsigned i = 0; i < config.size(); ++i) {
162 if (config[i].keyword != keyword) {
165 if (config[i].parameters.size() > 0 ||
166 config[i].arguments.size() != 1) {
167 log(ERROR, "'%s' takes one argument and no parameters", keyword.c_str());
170 *value = atoi(config[i].arguments[0].c_str()); // TODO: verify int validity.
176 bool parse_port(const ConfigLine &line, Config *config)
178 if (line.arguments.size() != 1) {
179 log(ERROR, "'port' takes exactly one argument");
183 int port = atoi(line.arguments[0].c_str());
184 if (port < 1 || port >= 65536) {
185 log(ERROR, "port %d is out of range (must be [1,65536>).", port);
189 AcceptorConfig acceptor;
190 acceptor.addr = CreateAnyAddress(port);
192 config->acceptors.push_back(acceptor);
196 bool parse_listen(const ConfigLine &line, Config *config)
198 if (line.arguments.size() != 1) {
199 log(ERROR, "'listen' takes exactly one argument");
203 AcceptorConfig acceptor;
204 if (!parse_hostport(line.arguments[0], &acceptor.addr)) {
207 config->acceptors.push_back(acceptor);
211 bool parse_stream(const ConfigLine &line, Config *config)
213 if (line.arguments.size() != 1) {
214 log(ERROR, "'stream' takes exactly one argument");
219 stream.url = line.arguments[0];
221 map<string, string>::const_iterator src_it = line.parameters.find("src");
222 if (src_it == line.parameters.end()) {
223 log(WARNING, "stream '%s' has no src= attribute, clients will not get any data.",
226 stream.src = src_it->second;
227 // TODO: Verify that the URL is parseable?
230 map<string, string>::const_iterator backlog_it = line.parameters.find("backlog_size");
231 if (backlog_it == line.parameters.end()) {
232 stream.backlog_size = DEFAULT_BACKLOG_SIZE;
234 stream.backlog_size = atoi(backlog_it->second.c_str());
238 map<string, string>::const_iterator encoding_parm_it = line.parameters.find("encoding");
239 if (encoding_parm_it == line.parameters.end() ||
240 encoding_parm_it->second == "raw") {
241 stream.encoding = StreamConfig::STREAM_ENCODING_RAW;
242 } else if (encoding_parm_it->second == "metacube") {
243 stream.encoding = StreamConfig::STREAM_ENCODING_METACUBE;
245 log(ERROR, "Parameter 'encoding' must be either 'raw' (default) or 'metacube'");
249 // Parse the pacing rate, converting from kilobits to bytes as needed.
250 map<string, string>::const_iterator pacing_rate_it = line.parameters.find("pacing_rate_kbit");
251 if (pacing_rate_it == line.parameters.end()) {
252 stream.pacing_rate = ~0U;
254 stream.pacing_rate = atoi(pacing_rate_it->second.c_str()) * 1024 / 8;
257 config->streams.push_back(stream);
261 bool parse_udpstream(const ConfigLine &line, Config *config)
263 if (line.arguments.size() != 1) {
264 log(ERROR, "'udpstream' takes exactly one argument");
268 UDPStreamConfig udpstream;
270 string hostport = line.arguments[0];
271 if (!parse_hostport(hostport, &udpstream.dst)) {
275 map<string, string>::const_iterator src_it = line.parameters.find("src");
276 if (src_it == line.parameters.end()) {
277 // This is pretty meaningless, but OK, consistency is good.
278 log(WARNING, "udpstream to %s has no src= attribute, clients will not get any data.",
281 udpstream.src = src_it->second;
282 // TODO: Verify that the URL is parseable?
285 // Parse the pacing rate, converting from kilobits to bytes as needed.
286 map<string, string>::const_iterator pacing_rate_it = line.parameters.find("pacing_rate_kbit");
287 if (pacing_rate_it == line.parameters.end()) {
288 udpstream.pacing_rate = ~0U;
290 udpstream.pacing_rate = atoi(pacing_rate_it->second.c_str()) * 1024 / 8;
293 // Parse the TTL. The same value is used for unicast and multicast.
294 map<string, string>::const_iterator ttl_it = line.parameters.find("ttl");
295 if (ttl_it == line.parameters.end()) {
298 udpstream.ttl = atoi(ttl_it->second.c_str());
301 config->udpstreams.push_back(udpstream);
305 bool parse_error_log(const ConfigLine &line, Config *config)
307 if (line.arguments.size() != 0) {
308 log(ERROR, "'error_log' takes no arguments (only parameters type= and filename=)");
312 LogConfig log_config;
313 map<string, string>::const_iterator type_it = line.parameters.find("type");
314 if (type_it == line.parameters.end()) {
315 log(ERROR, "'error_log' has no type= parameter");
319 string type = type_it->second;
320 if (type == "file") {
321 log_config.type = LogConfig::LOG_TYPE_FILE;
322 } else if (type == "syslog") {
323 log_config.type = LogConfig::LOG_TYPE_SYSLOG;
324 } else if (type == "console") {
325 log_config.type = LogConfig::LOG_TYPE_CONSOLE;
327 log(ERROR, "Unknown log type '%s'", type.c_str());
331 if (log_config.type == LogConfig::LOG_TYPE_FILE) {
332 map<string, string>::const_iterator filename_it = line.parameters.find("filename");
333 if (filename_it == line.parameters.end()) {
334 log(ERROR, "error_log type 'file' with no filename= parameter");
337 log_config.filename = filename_it->second;
340 config->log_destinations.push_back(log_config);
346 bool parse_config(const string &filename, Config *config)
348 vector<ConfigLine> lines;
349 if (!read_config(filename, &lines)) {
353 config->daemonize = false;
355 if (!fetch_config_int(lines, "num_servers", &config->num_servers)) {
356 log(ERROR, "Missing 'num_servers' statement in config file.");
359 if (config->num_servers < 1 || config->num_servers >= 20000) { // Insanely high max limit.
360 log(ERROR, "'num_servers' is %d, needs to be in [1, 20000>.", config->num_servers);
364 // See if the user wants stats.
365 config->stats_interval = 60;
366 bool has_stats_file = fetch_config_string(lines, "stats_file", &config->stats_file);
367 bool has_stats_interval = fetch_config_int(lines, "stats_interval", &config->stats_interval);
368 if (has_stats_interval && !has_stats_file) {
369 log(WARNING, "'stats_interval' given, but no 'stats_file'. No client statistics will be written.");
372 config->input_stats_interval = 60;
373 bool has_input_stats_file = fetch_config_string(lines, "input_stats_file", &config->input_stats_file);
374 bool has_input_stats_interval = fetch_config_int(lines, "input_stats_interval", &config->input_stats_interval);
375 if (has_input_stats_interval && !has_input_stats_file) {
376 log(WARNING, "'input_stats_interval' given, but no 'input_stats_file'. No input statistics will be written.");
379 fetch_config_string(lines, "access_log", &config->access_log_file);
381 for (size_t i = 0; i < lines.size(); ++i) {
382 const ConfigLine &line = lines[i];
383 if (line.keyword == "num_servers" ||
384 line.keyword == "stats_file" ||
385 line.keyword == "stats_interval" ||
386 line.keyword == "input_stats_file" ||
387 line.keyword == "input_stats_interval" ||
388 line.keyword == "access_log") {
389 // Already taken care of, above.
390 } else if (line.keyword == "port") {
391 if (!parse_port(line, config)) {
394 } else if (line.keyword == "listen") {
395 if (!parse_listen(line, config)) {
398 } else if (line.keyword == "stream") {
399 if (!parse_stream(line, config)) {
402 } else if (line.keyword == "udpstream") {
403 if (!parse_udpstream(line, config)) {
406 } else if (line.keyword == "error_log") {
407 if (!parse_error_log(line, config)) {
410 } else if (line.keyword == "daemonize") {
411 config->daemonize = true;
413 log(ERROR, "Unknown configuration keyword '%s'.",
414 line.keyword.c_str());