udp server

.vscode/.server-controller-port.log

@@ -1,5 +1,5 @@
 {
   "port": 13452,
-  "time": 1751819046475,
+  "time": 1752334981843,
   "version": "0.0.3"
 }

src/rds95.c

@@ -9,6 +9,7 @@
 #include "rds.h"
 #include "modulator.h"
 #include "control_pipe.h"
+#include "udp_server.h"
 #include "lib.h"
 #include "ascii_cmd.h"
 
@@ -37,6 +38,16 @@ static void *control_pipe_worker(void* modulator) {
 	pthread_exit(NULL);
 }
 
+static void *udp_server_worker() {
+	while (!stop_rds) {
+		poll_udp_server();
+		msleep(READ_TIMEOUT_MS);
+	}
+
+	close_udp_server();
+	pthread_exit(NULL);
+}
+
 static inline void show_help(char *name) {
 	printf(
 		"\n"
@@ -52,27 +63,32 @@ static inline void show_help(char *name) {
 typedef struct
 {
 	char control_pipe[51];
+	uint16_t udp_port;
 	char rds_device_name[32];
 	uint8_t num_streams;
 } RDS95_Config;
 
 static int config_handler(void* user, const char* section, const char* name, const char* value) {
-	RDS95_Config* config = (RDS95_Config*)user;
+    RDS95_Config* config = (RDS95_Config*)user;
 
-	#define MATCH(s, n) strcmp(section, s) == 0 && strcmp(name, n) == 0
-	if(MATCH("rds95", "control_pipe")) {
-		strncpy(config->control_pipe, value, 49);
-        config->control_pipe[50] = '\0';
-	} else if(MATCH("devices", "rds95")) {
-		strncpy(config->rds_device_name, value, 30);
-        config->rds_device_name[31] = '\0';
-	} else if(MATCH("rds95", "streams")) {
-		config->num_streams = atoi(value);
-		if(config->num_streams > MAX_STREAMS || config->num_streams == 0) return 1;
-	} else {
-		return 0;
-	}
-	return 1;
+    #define MATCH(s, n) (strcmp(section, s) == 0 && strcmp(name, n) == 0)
+
+    if (MATCH("rds95", "control_pipe")) {
+        strncpy(config->control_pipe, value, sizeof(config->control_pipe) - 1);
+        config->control_pipe[sizeof(config->control_pipe) - 1] = '\0';
+    } else if (MATCH("rds95", "udp_port")) {
+        config->udp_port = (uint16_t)atoi(value);
+    } else if (MATCH("devices", "rds95")) {
+        strncpy(config->rds_device_name, value, sizeof(config->rds_device_name) - 1);
+        config->rds_device_name[sizeof(config->rds_device_name) - 1] = '\0';
+    } else if (MATCH("rds95", "streams")) {
+        int streams = atoi(value);
+        if (streams > MAX_STREAMS || streams == 0) return 0;
+        config->num_streams = (uint8_t)streams;
+    } else {
+        return 0;  // Unknown config key
+    }
+    return 1;
 }
 
 int main(int argc, char **argv) {
@@ -81,6 +97,7 @@ int main(int argc, char **argv) {
 	char config_path[64] = DEFAULT_CONFIG_PATH;
 	RDS95_Config config = {
 		.control_pipe = "\0",
+		.udp_port = 0,
 		.rds_device_name = RDS_DEVICE,
 		.num_streams = DEFAULT_STREAMS
 	};
@@ -91,6 +108,7 @@ int main(int argc, char **argv) {
 
 	pthread_attr_t attr;
 	pthread_t control_pipe_thread;
+	pthread_t udp_server_thread;
 
 	const char	*short_opt = "c:h";
 
@@ -174,6 +192,21 @@ int main(int argc, char **argv) {
 		}
 	}
 
+	if(config.udp_port) {
+		if(open_udp_server(config.udp_port, &rdsModulator) == 0) {
+			fprintf(stderr, "Reading control commands on UDP:%d.\n", config.udp_port);
+			int r = pthread_create(&udp_server_thread, &attr, udp_server_worker, NULL);
+			if (r < 0) {
+				fprintf(stderr, "Could not create UDP server thread.\n");
+				config.udp_port = 0;
+				goto exit;
+			} else fprintf(stderr, "Created UDP server thread.\n");
+		} else {
+			fprintf(stderr, "Failed to open UDP server\n");
+			config.udp_port = 0;
+		}
+	}
+
 	int pulse_error;
 
 	// Dynamically allocate buffer based on stream count
@@ -202,6 +235,11 @@ exit:
 		pthread_join(control_pipe_thread, NULL);
 	}
 
+	if(config.udp_port) {
+		fprintf(stderr, "Waiting for UDP thread to shut down.\n");
+		pthread_join(udp_server_thread, NULL);
+	}
+
 	cleanup_rds_modulator(&rdsModulator);  // Clean up dynamically allocated memory
 	pthread_attr_destroy(&attr);
 	if (rds_device != NULL) pa_simple_free(rds_device);

src/udp_server.c

@@ -0,0 +1,83 @@
+#include "udp_server.h"
+
+#define BUF_SIZE 512
+#define UDP_READ_TIMEOUT_MS 500
+
+static int sockfd = -1;
+static struct pollfd poller;
+static struct sockaddr_in client_addr;
+static socklen_t client_len = sizeof(client_addr);
+
+static RDSModulator* mod = NULL;  // Store modulator pointer globally or pass it somehow
+
+int open_udp_server(int port, RDSModulator* rds_mod) {
+    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (sockfd < 0) return -1;
+
+    struct sockaddr_in server_addr;
+    memset(&server_addr, 0, sizeof(server_addr));
+
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_addr.s_addr = INADDR_ANY;
+    server_addr.sin_port = htons(port);
+
+    if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+        close(sockfd);
+        sockfd = -1;
+        return -1;
+    }
+
+    poller.fd = sockfd;
+    poller.events = POLLIN;
+
+    mod = rds_mod;  // Save mod pointer
+
+    return 0;
+}
+
+void poll_udp_server() {
+    static char buf[BUF_SIZE];
+    static char cmd_buf[BUF_SIZE];
+    static char cmd_output[BUF_SIZE];  // Buffer to collect output from process_ascii_cmd
+    ssize_t bytes_read;
+
+    if (poll(&poller, 1, UDP_READ_TIMEOUT_MS) <= 0) return;
+    if (!(poller.revents & POLLIN)) return;
+
+    memset(buf, 0, BUF_SIZE);
+    client_len = sizeof(client_addr);
+	bytes_read = recvfrom(sockfd, buf, BUF_SIZE - 1, 0,
+                      (struct sockaddr *)&client_addr, &client_len);
+    if (bytes_read <= 0) return;
+
+    buf[bytes_read] = '\0';
+
+    char *token = strtok(buf, "\r\n");
+    while (token != NULL) {
+        size_t len = strlen(token);
+        if (len > 0 && len < BUF_SIZE) {
+            memset(cmd_buf, 0, BUF_SIZE);
+            strncpy(cmd_buf, token, BUF_SIZE - 1);
+
+            memset(cmd_output, 0, BUF_SIZE);
+            // Pass cmd_output buffer to collect output from the command processor
+            process_ascii_cmd(mod, cmd_buf, cmd_output);
+
+            // Send cmd_output back to client (even if empty, send it)
+            size_t out_len = strlen(cmd_output);
+            if (out_len > 0) {
+                ssize_t sent = sendto(sockfd, cmd_output, out_len, 0,
+                                      (struct sockaddr *)&client_addr, client_len);
+                if (sent == -1) {
+                    perror("sendto");
+                }
+            }
+        }
+        token = strtok(NULL, "\r\n");
+    }
+}
+
+void close_udp_server() {
+    if (sockfd >= 0) close(sockfd);
+    sockfd = -1;
+}

src/udp_server.h

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include "modulator.h"
+#include "ascii_cmd.h"
+
+int open_udp_server(int port, RDSModulator *rds_mod);
+
+void poll_udp_server();
+
+void close_udp_server();